CN113546827A - Preparation method of heat-insulating aluminum alloy profile - Google Patents
Preparation method of heat-insulating aluminum alloy profile Download PDFInfo
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- CN113546827A CN113546827A CN202110580004.1A CN202110580004A CN113546827A CN 113546827 A CN113546827 A CN 113546827A CN 202110580004 A CN202110580004 A CN 202110580004A CN 113546827 A CN113546827 A CN 113546827A
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- aluminum alloy
- glue injection
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- base material
- heat
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 127
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000003292 glue Substances 0.000 claims abstract description 213
- 238000002347 injection Methods 0.000 claims abstract description 170
- 239000007924 injection Substances 0.000 claims abstract description 170
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims abstract description 91
- 239000011248 coating agent Substances 0.000 claims abstract description 80
- 238000000576 coating method Methods 0.000 claims abstract description 80
- 239000003973 paint Substances 0.000 claims abstract description 71
- 239000000463 material Substances 0.000 claims abstract description 60
- 239000002033 PVDF binder Substances 0.000 claims abstract description 55
- 238000005507 spraying Methods 0.000 claims abstract description 48
- 239000000758 substrate Substances 0.000 claims abstract description 45
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 42
- 238000001035 drying Methods 0.000 claims abstract description 40
- 239000004576 sand Substances 0.000 claims abstract description 31
- 238000002161 passivation Methods 0.000 claims abstract description 24
- 238000005488 sandblasting Methods 0.000 claims abstract description 15
- 238000004049 embossing Methods 0.000 claims abstract description 13
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 239000011347 resin Substances 0.000 claims description 93
- 229920005989 resin Polymers 0.000 claims description 93
- 238000005406 washing Methods 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000002994 raw material Substances 0.000 claims description 17
- 238000005422 blasting Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 238000005530 etching Methods 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 239000004925 Acrylic resin Substances 0.000 claims description 9
- 229920000178 Acrylic resin Polymers 0.000 claims description 9
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 239000004645 polyester resin Substances 0.000 claims description 4
- 229920001225 polyester resin Polymers 0.000 claims description 4
- 238000009413 insulation Methods 0.000 abstract description 25
- 230000000694 effects Effects 0.000 abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 22
- 239000003795 chemical substances by application Substances 0.000 description 17
- 238000007865 diluting Methods 0.000 description 14
- 239000003085 diluting agent Substances 0.000 description 14
- 229910000151 chromium(III) phosphate Inorganic materials 0.000 description 9
- IKZBVTPSNGOVRJ-UHFFFAOYSA-K chromium(iii) phosphate Chemical group [Cr+3].[O-]P([O-])([O-])=O IKZBVTPSNGOVRJ-UHFFFAOYSA-K 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 239000012774 insulation material Substances 0.000 description 7
- 238000004873 anchoring Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 238000005034 decoration Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
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- 229910017665 NH4HF2 Inorganic materials 0.000 description 1
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- 150000003863 ammonium salts Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000004140 cleaning Methods 0.000 description 1
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- 238000002425 crystallisation Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000005002 finish coating Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
- B05D3/102—Pretreatment of metallic substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/57—Three layers or more the last layer being a clear coat
- B05D7/574—Three layers or more the last layer being a clear coat at least some layers being let to dry at least partially before applying the next layer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/002—Priming paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2350/00—Pretreatment of the substrate
- B05D2350/30—Change of the surface
- B05D2350/33—Roughening
- B05D2350/38—Roughening by mechanical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2502/00—Acrylic polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2504/00—Epoxy polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2508/00—Polyesters
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a preparation method of a heat-insulating aluminum alloy profile, which comprises the following steps: carrying out sand blasting treatment on a glue injection notch of the aluminum alloy base material, and forming a sand surface on the surface of the glue injection notch; carrying out passivation pretreatment on the aluminum alloy base material; performing primer spraying treatment on the aluminum alloy substrate by adopting PVDF fluorocarbon coating, and drying; performing finish paint spraying treatment on the aluminum alloy substrate by adopting PVDF fluorocarbon coating, and drying; solidifying the aluminum alloy base material; embossing a glue injection notch of the aluminum alloy substrate, and forming a concave tooth notch at the edge of the glue injection notch; injecting heat-insulating glue into the glue injection notch, and drying and curing; and (5) carrying out bridge cutting on the aluminum alloy base material subjected to glue injection to obtain a finished product. By adopting the invention, the aluminum alloy section with good weather resistance and good heat insulation effect can be obtained, the longitudinal shear mechanical property and the like can meet the performance requirements, and the aluminum alloy section can be suitable for the high-strength sunlight irradiation outdoors.
Description
Technical Field
The invention relates to the technical field of aluminum profiles, in particular to a preparation method of a heat-insulating aluminum alloy profile.
Background
The aluminum alloy section after surface treatment is widely applied to building door and window or curtain wall structures because the surface has certain decoration and protection properties. In order to improve the heat insulation coefficient of door and window or curtain wall products, a part of the structure of the aluminum alloy section bar is usually made of heat insulation type materials to replace aluminum alloy metal materials, so that the heat conductivity coefficient of the door and window products is reduced. The currently adopted products comprise a strip-penetrating type heat insulation aluminum profile and a glue injection type heat insulation profile. The heat insulating bar is made of polyurethane (66 wt% of glass fiber) and is inserted into the technological grooves of two aluminium alloy sections, and then rolled to form an integral product, and the liquid heat insulating material is injected into the casting groove, after solidification, the metal bridge corresponding to the opening of the casting groove is cut off, and the heat insulating bridge formed by solidifying the liquid heat insulating material is connected with the aluminium alloy section in the inner and outer cavities by the adhesive force of the aluminium alloy section, so that the heat insulating bridge and the aluminium section are completely adhered into an integral product.
However, the existing strip-penetrating type heat-insulating aluminum profile and glue-injection type heat-insulating aluminum profile have the following problems:
1. strip penetrating type heat insulation aluminum profile: the strip penetrating type heat insulation aluminum profile is formed by connecting two parts of aluminum profiles into an integral part in a meshing mode through the heat insulation strips, the material structure is changed under the process, stress is generated to enable the integral strength of the profiles to be poor, the process limits the strength of the heat insulation material, and even the strip penetrating type heat insulation aluminum profile is sometimes used for the waste products caused by obvious cracks or breakage due to slightly large hardness of the profiles. In addition, the heat transfer coefficient of the polyurethane heat insulation strip is larger than that of the polyester glue injection material, so that the heat insulation effect of the polyurethane heat insulation strip is inferior to that of the polyester glue injection material.
2. Glue injection type heat insulation aluminum profile: the glue injection type heat insulation product is characterized in that a liquid heat insulation material is poured into a notch of a section, a heat insulation bridge formed by solidification is connected with an aluminum alloy section with an inner cavity and an outer cavity, the surface of the section needs to be subjected to surface treatment, so that the compatibility of a protective film layer on the surface of the product and the heat insulation glue is critical, the glue injection type heat insulation product commonly used at present is subjected to powder spraying treatment, and the longitudinal shear resistance of the heat insulation product is poor and cannot be adopted due to the fact that the compatibility of a common powder coating and the heat insulation glue is ideal, but the outdoor weather resistance of the heat insulation product is poor and is not suitable for places irradiated by high-strength sunlight.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of a heat-insulating aluminum alloy section, which can obtain an aluminum alloy section with good weather resistance and good heat-insulating effect, not only can the longitudinal shear-resistant mechanical property and the like meet the performance requirements, but also can be suitable for high-strength sunlight irradiation outdoors.
In order to achieve the technical effect, the invention provides a preparation method of a heat-insulating aluminum alloy section, which comprises the following steps:
carrying out sand blasting treatment on a glue injection notch of the aluminum alloy base material, and forming a sand surface on the surface of the glue injection notch;
carrying out passivation pretreatment on the aluminum alloy base material subjected to sand blasting treatment;
performing primer spraying treatment on the aluminum alloy substrate subjected to passivation pretreatment by using PVDF (polyvinylidene fluoride) fluorocarbon coating, and drying;
the aluminum alloy substrate sprayed with the primer is subjected to finish paint spraying treatment by adopting PVDF fluorocarbon paint and is dried;
curing the aluminum alloy base material after being sprayed with the finish paint and dried;
embossing the glue injection notch of the solidified aluminum alloy substrate to form a concave tooth notch at the edge of the glue injection notch;
injecting heat-insulating glue into the glue injection notch, and drying and curing;
and (5) carrying out bridge cutting on the aluminum alloy base material subjected to glue injection to obtain a finished product.
As a preferred embodiment, the sand blasting of the injection slot of the aluminum alloy substrate includes:
placing the glue injection notch of the aluminum alloy base material upwards;
and performing coarse sand treatment by adopting shot blasting with the particle size of 0.1-0.5 mm, and forming a sand surface on the surface of the glue injection notch.
As a preferred embodiment, the passivation pre-treatment comprises:
washing the aluminum alloy base material with water;
the cleaned aluminum alloy base material is subjected to oil removal pretreatment, surface oil stains are removed, and the oil removal etching amount is more than or equal to 1.5g/m2；
Washing the aluminum alloy base material with water;
forming a passivation film on the surface of the aluminum alloy substrate;
washing the aluminum alloy base material with water;
and drying the aluminum alloy base material.
As a preferred embodiment, the raw materials of the PVDF fluorocarbon coating selected for the primer include resin, wherein the resin includes 35-50% of fluorocarbon resin, 10-20% of acrylic resin, and 16-30% of epoxy resin or polyester resin;
the PVDF fluorocarbon coating used as the finishing coat is prepared from resin, wherein the resin comprises 69-72% of fluorocarbon resin and 28-31% of acrylic resin.
In a preferred embodiment, the primer is a PVDF fluorocarbon coating with the viscosity of 10-15', and the thickness of a coating film formed by the primer is 5-15 μm;
the finish paint is a PVDF (polyvinylidene fluoride) fluorocarbon coating with the viscosity of 18-25', and the thickness of a coating film formed by the finish paint is 20-35 mu m;
the spraying process of the primer and the finish paint is controlled to be 40 KV-90 KV, the spraying distance is 250-350 mm, and the atomizing air pressure is 0.1-0.2 MPa.
As a preferred embodiment, the finish paint and the primer paint are subjected to quick drying treatment after being sprayed, and the drying time is 5-10 min;
and drying the finish paint and the primer and then carrying out high-temperature curing treatment, wherein the curing temperature is 220-240 ℃, and the curing time is 5-15 min.
In a preferred embodiment, the concave tooth openings are discontinuous pits, the distance between every two pits is less than 1cm, and the depth of each pit is more than 0.2 mm.
In a preferred embodiment, the cross-section of the concave point is arc-shaped.
As a preferred embodiment, the heat-insulating glue is injected into the glue injection notch through the glue injection machine, wherein the included angle between the glue injection nozzle of the glue injection machine and the glue injection notch is 75-85 degrees, the distance between the glue injection nozzle and the glue injection notch is 5-10 mm, the rotating speed of a stirring head of the glue injection machine is 3500-4000 r/min, and the temperature of the heat-insulating glue is 23 +/-5 ℃.
As a preferred embodiment, the curing temperature of the heat-insulating glue is 120-140 ℃, and the time is more than or equal to 30 min.
The implementation of the invention has the following beneficial effects:
the invention utilizes a multi-channel mechanical pretreatment mode to ensure that the subsequent heat insulation material has enough anchoring points after being poured, and the mechanical properties such as longitudinal shear resistance and the like are enhanced, and the PVDF fluorocarbon coating is selected to improve the compatibility of the heat insulation material and the heat insulation glue, and the surface of the aluminum profile is covered by spraying the weather-resistant PVDF fluorocarbon coating, so that the decoration and the weather resistance of the surface of the product are ensured, and the requirement of the aluminum profile for long-term outdoor use in areas with high-strength solar light irradiation is met.
Drawings
FIG. 1 is a flow chart of a method of making an insulated aluminum alloy profile of the present invention;
FIG. 2 is a schematic view of a sand blasting process of an insulated aluminum alloy profile of the present invention;
FIG. 3 is a schematic structural view of an insulated aluminum alloy profile of the present invention;
FIG. 4 is a cross-sectional view of an insulated aluminum alloy section of the present invention;
FIG. 5 is an enlarged view of a view angle of a glue injection notch of the heat-insulating aluminum alloy profile of the present invention;
FIG. 6 is an enlarged view of another view of the glue injection notch of the heat-insulating aluminum alloy profile of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in FIG. 1, the invention provides a preparation method of a heat-insulating aluminum alloy profile, which comprises the following steps:
s101, carrying out sand blasting treatment on a glue injection notch of the aluminum alloy base material, and forming a sand surface on the surface of the glue injection notch;
step S101 includes:
placing the glue injection notch of the aluminum alloy base material upwards;
and performing coarse sand treatment by adopting shot blasting with the particle size of 0.1-0.5 mm, and forming a sand surface on the surface of the glue injection notch. Preferably, the shot blasting is 0.2-0.3 mm.
The method increases the roughness of the surface of the glue injection notch part of the sectional material by using a mechanical pretreatment mode, generates uniform and fine concave-convex surfaces on the surface of the glue injection notch, ensures that a subsequent thermal insulation material has enough anchoring points after being poured, and enhances the mechanical properties of longitudinal shearing resistance and the like. Preferably, the pretreatment is coarse sand treatment, more preferably, shot blasting with the particle size of 0.2-0.3 mm is adopted for coarse sand treatment, the shot blasting is shot to the surface of the aluminum profile by utilizing compressed air, and the mechanical sand blasting process has the cleaning effect of the sand blasting and the surface strengthening effect of the shot blasting.
Under different pretreatment conditions, due to different mechanisms of sand surface formation, the microscopic morphology of the surface of the aluminum profile, the surface crystal organization mechanism and the surface activation energy are also substantially different, which affects the performance of a subsequent PVDF fluorocarbon coating for forming a coating film.
The invention adopts coarse sand treatment, and the particle size of shot blasting is limited to be 0.1-0.5 mm, and more preferably 0.2-0.3 mm. Moreover, the hardness is selected as follows: HV 500-HV 700 stainless steel shots, and the motor frequency of the sand blasting machine is controlled to be 25-35%, so that the injection pressure is controlled. As shown in fig. 2, fig. 2 is a partial schematic view showing the aluminum alloy base material 1 after the sand blasting treatment, in which (a) a state is an original state of the surface of the aluminum profile base material 1, (b) a state is a state in which the surface of the aluminum profile base material 1 is impacted by the shot blast 2, and (c) a state is a state in which the surface of the aluminum profile base material 1 is impacted by the shot blast 2, and then the surface is formed with the uneven surface 3. As can be seen from fig. 2, the surface of the aluminum profile substrate 1 becomes rougher under the impact of the shot blasting than the original surface, the sharp part of the aluminum profile surface also becomes flat under the impact of the shot blasting, and finally, a uniform and fine surface with certain roughness is formed on the aluminum profile surface, so that sufficient anchoring points are ensured after the subsequent heat insulation material is poured, and the mechanical properties such as longitudinal shear resistance are enhanced.
In the sand blasting process, the surface metal undergoes the stages of easy slippage, deformation strengthening and the like, dislocation occurs on the crystal surface in the easy slippage stage, and the dislocation has important influence on potential deformation at the temperature lower than the crystallization temperature. The dislocation forms plane plug groups, the rheological stress is increased, and the interaction of the plug group dislocation leads to the increase of each dislocation energy, so that the chemical potential energy of the surface dislocation is increased, and the longitudinal shear resistance and other mechanical properties of the surface dislocation are further increased.
S102, carrying out passivation pretreatment on the aluminum alloy base material subjected to sand blasting;
step S102 includes: the passivation pretreatment comprises the following steps:
washing the aluminum alloy substrate with water to clean dust, sand shot particles and the like remained on the surface of the aluminum profile;
the cleaned aluminum alloy base material is subjected to oil removal pretreatment, surface oil stains are removed, and the oil removal etching amount is more than or equal to 1.5g/m2；
Washing the aluminum alloy substrate with water to clean the surface;
forming a passivation film on the surface of the aluminum alloy substrate; specifically, the passivation agent is used for producing a layer of passivation film on the surface of the base material of the section bar, the corrosion resistance of the base material and the adhesion of the base material and the coating are improved, and preferably, the passivation agent is a chromium phosphate passivation agent, wherein phosphoric acid accounts for 40-50 ml/L, chromic anhydride accounts for 2-10 g/L, and the pH value is as follows: 1.4-2.0, F-concentration of 0.3-0.6 g/L, weight of the passive film of 800-1200 mg/m2. The invention selects the chromium phosphate passivator to enhance the adhesion with the subsequent coating.
Washing the aluminum alloy substrate with water to clean the surface;
drying the aluminum alloy base material; specifically, the drying may be drying the moisture on the surface of the profile by using a high temperature, where the temperature is: 60-90 ℃, time: 10-30 min, but not limited thereto.
It should be noted that in the degreasing pretreatment in this step, the degreasing etching amount is not less than 1.5g/m2By controlling the etching amount, the roughness (surface area) of the surface of the product is further improved. The larger the contact surface and the friction force between the surface of the product and the coating are, the larger the longitudinal shear-resistant mechanical property is, and the performance of the aluminum alloy section is further improved.
S103, performing primer spraying treatment on the aluminum alloy substrate subjected to passivation pretreatment by using a PVDF (polyvinylidene fluoride) fluorocarbon coating, and drying;
the PVDF fluorocarbon coating selected as the primer comprises resin, wherein the resin comprises 35-50% of fluorocarbon resin, 10-20% of acrylic resin and 16-30% of epoxy resin or polyester resin.
In a preferred embodiment, the primer is a PVDF fluorocarbon coating with the viscosity of 10-15', and the thickness of a coating film formed by the primer is 5-15 μm;
in a preferred embodiment, the primer spraying process is controlled to have a static voltage of 40KV to 90KV, a spraying distance of 250 mm to 350mm, and an atomization air pressure of 0.1 MPa to 0.2 MPa. And (3) carrying out quick drying treatment on the primer after spraying, wherein the drying time is 5-10 min.
S104, selecting PVDF fluorocarbon paint as the aluminum alloy substrate after the primer is sprayed for finish paint spraying treatment and drying;
the aluminum alloy substrate is sprayed with the PVDF fluorocarbon coating, and the PVDF fluorocarbon coating is selected as the finish coating and comprises resin as raw materials, wherein the resin comprises 69-72% of fluorocarbon resin and 28-31% of acrylic resin.
In a preferred embodiment, the PVDF fluorocarbon coating is sprayed by 2-3 layers generally, the first layer (the layer contacting with the section bar) is a primer layer, and the fluorocarbon resin accounts for 35-50% of the solid resin, the acrylic resin accounts for 10-20%, and the epoxy resin or polyester resin accounts for 16-30% of the solid resin, and is used for well contacting with the section bar; the second layer or the third layer is a finish paint layer (in contact with the glue injection glue), and the formula components of the finish paint layer are 69-72% of fluorocarbon resin in resin solid and 28-31% of acrylic resin, so that the finish paint layer and the acrylic resin are in good contact with the glue injection glue, and the compatibility of the finish paint layer and the glue injection glue is improved.
As a preferred embodiment, the finish paint is PVDF fluorocarbon paint with the viscosity of 18-25', and the thickness of a coating film formed by the finish paint is 20-35 mu m;
as a preferred embodiment, the spraying process of the finish paint is controlled to be 40 KV-90 KV, the spraying distance is 250-350 mm, and the atomization air pressure is 0.1-0.2 MPa. Carrying out quick drying treatment on the finish after spraying, wherein the drying time is 5-10 min;
and drying the finish paint and the primer and then carrying out high-temperature curing treatment, wherein the curing temperature is 220-240 ℃, and the curing time is 5-15 min.
The primer and the finish paint are attached to the aluminum alloy substrate which is subjected to coarse sand treatment and passivation, the compatibility of the aluminum alloy substrate and the heat insulation glue can be improved, moreover, the PVDF fluorocarbon coating has good weather resistance, the decoration and the weather resistance of the surface of a product are ensured, and the requirement of the PVDF fluorocarbon coating for long-term outdoor use in high-strength solar irradiation areas is met.
S105, curing the aluminum alloy base material which is sprayed with the finish paint and dried;
specifically, the coating film on the surface of the shaped material is subjected to a curing reaction at a high temperature, and the conditions for the high-temperature curing are set as follows: 220-240 ℃, time: 5-15 min, but not limited thereto.
S106, embossing the glue injection notch of the solidified aluminum alloy base material to form a concave tooth notch at the edge of the glue injection notch;
according to the invention, embossing treatment is carried out on the glue injection notch, and the concave tooth notch is formed at the edge of the glue injection notch, so that air at the position is discharged in the subsequent glue injection process, the longitudinal shear-resistant mechanical property of a product can be ensured, and the anchoring force of the subsequent thermal insulation material after pouring is ensured.
As shown in fig. 3, which is a schematic structural diagram of the heat-insulating aluminum alloy profile, the aluminum profile base material 1 is provided with a glue injection notch 4, as shown in fig. 4, a concave tooth opening 5 is formed at an edge of the glue injection notch 4, and a cross section of the concave tooth opening 5 is preferably arc-shaped, and more preferably semicircular.
It should be noted that the position of the notch is the edge of the glue injection slot, please refer to the edge 4A of the glue injection slot in fig. 4, to form two C-shaped slots with opposite openings.
Referring to fig. 5 and 6, preferably, the concave tooth openings are discontinuous pits, the distance between every two pits is less than 1cm, and the depth of each pit is more than 0.2 mm. More preferably, the distance between the concave points is less than 0.8cm, and the depth of the concave points is more than 0.3 mm.
The invention sets the distance and the depth of the concave points, further improves the contact surface between the subsequent glue injection glue and the section bar, enables the surface of the section bar to have the function similar to anchor point anchoring glue, and improves the longitudinal shear-resistant mechanical property. If the distance between the concave points is larger than or equal to 1cm, the action of the anchor points is weakened, and the lifting efficiency is low; if the depth of the concave point is less than or equal to 0.2mm, the action of the anchor point is weakened, and the lifting efficiency is low.
S107, injecting heat-insulating glue into the glue injection notch, and drying and curing;
injecting heat insulation glue into the glue injection notch through the glue injection machine, wherein an included angle between a glue injection nozzle of the glue injection machine and the glue injection notch is 75-85 degrees, the distance between the glue injection nozzle and the glue injection notch is 5-10 mm, the rotating speed of a stirring head of the glue injection machine is 3500-4000 revolutions/min, and the temperature of the heat insulation glue is 23 +/-5 ℃.
The curing temperature of the heat-insulating glue is 120-140 ℃, and the time is more than or equal to 30 min.
And S108, carrying out bridge cutting on the aluminum alloy base material subjected to glue injection to obtain a finished product.
The invention is further illustrated by the following specific examples
Example 1
(1) Placing the glue injection notch of the aluminum alloy base material upwards, and performing coarse sand treatment by adopting shot blasting with the particle size of 0.1mm to form a sand surface on the surface of the glue injection notch;
(2) washing an aluminum alloy substrate with water, performing oil removal pretreatment, washing with water, forming a passivation film, washing with water, and drying in sequence, wherein the oil removal etching amount is 1.5g/m2(ii) a The passivating agent is a chromium phosphate passivating agent;
(3) diluting the primer by using a diluent until the viscosity is 10', spraying the primer on the surface of the profile by using spraying equipment to form a layer of coating film, wherein the thickness of the coating film is controlled to be 7 mu m, the primer is a PVDF (polyvinylidene fluoride) fluorocarbon coating, the raw material of the PVDF fluorocarbon coating comprises resin, the resin comprises fluorocarbon resin, and the proportion of the fluorocarbon resin in the total resin is 70%;
(4) diluting the finish paint with a diluent until the viscosity is 18', spraying the finish paint on the surface of the profile by using spraying equipment to form a layer of coating film, wherein the thickness of the coating film is controlled to be 22 mu m, the finish paint is PVDF fluorocarbon paint, the raw material of the PVDF fluorocarbon paint comprises resin, the resin comprises fluorocarbon resin, and the proportion of the fluorocarbon resin in the total resin is 70%;
(5) and (3) curing the aluminum alloy substrate which is sprayed with the finish paint and dried at the curing temperature: 230 ℃, curing time: curing for 5 min;
(6) embossing a glue injection notch of the solidified aluminum alloy substrate, and forming a concave tooth opening at the edge of the glue injection notch, wherein the concave tooth opening is discontinuous concave points, the distance between the concave points is 1cm, and the depth of the concave points is 0.2 mm;
(7) injecting heat-insulating glue into the glue injection notch through a glue injection machine, drying and curing, wherein an included angle between a glue injection nozzle of the glue injection machine and the glue injection notch is 75 degrees, the distance between the glue injection nozzle and the glue injection notch is 5mm, the rotating speed of a stirring head of the glue injection machine is 3500 rpm, and the temperature of the heat-insulating glue is 23 ℃; the curing temperature of the heat-insulating glue is 120 ℃, and the curing time is 30 min;
(8) and (5) carrying out bridge cutting on the aluminum alloy base material subjected to glue injection to obtain a finished product.
Example 2
(1) Placing the glue injection notch of the aluminum alloy base material upwards, and performing coarse sand treatment by adopting shot blasting with the particle size of 0.2mm to form a sand surface on the surface of the glue injection notch;
(2) washing an aluminum alloy substrate with water, performing oil removal pretreatment, washing with water, forming a passivation film, washing with water, and drying in sequence, wherein the oil removal etching amount is 1.8g/m2(ii) a The passivating agent is a chromium phosphate passivating agent;
(3) diluting the primer by using a diluent until the viscosity is 12', spraying the primer on the surface of the profile by using spraying equipment to form a layer of coating film, wherein the thickness of the coating film is controlled to be 10 mu m, the primer is a PVDF (polyvinylidene fluoride) fluorocarbon coating, the raw material of the PVDF fluorocarbon coating comprises resin, the resin comprises fluorocarbon resin, and the proportion of the fluorocarbon resin in the total resin is 70%;
(4) diluting the finish paint with a diluent until the viscosity is 22', spraying the finish paint on the surface of the profile by using spraying equipment to form a layer of coating film, wherein the thickness of the coating film is controlled to be 25 mu m, the finish paint is PVDF fluorocarbon paint, the raw material of the PVDF fluorocarbon paint comprises resin, the resin comprises fluorocarbon resin, and the proportion of the fluorocarbon resin in the total resin is 70%;
(5) and (3) curing the aluminum alloy substrate which is sprayed with the finish paint and dried at the curing temperature: 235 ℃, curing time: curing for 8 min;
(6) embossing the glue injection notch of the solidified aluminum alloy substrate, and forming a concave tooth opening at the edge of the glue injection notch, wherein the concave tooth opening is discontinuous concave points, the distance between the concave points is 0.8cm, and the depth of the concave points is 0.3 mm;
(7) injecting heat-insulating glue into the glue injection notch through a glue injection machine, drying and curing, wherein the included angle between a glue injection nozzle of the glue injection machine and the glue injection notch is 78 degrees, the distance between the glue injection nozzle and the glue injection notch is 7mm, the rotating speed of a stirring head of the glue injection machine is 3600 r/min, and the temperature of the heat-insulating glue is 24 ℃; the curing temperature of the heat-insulating glue is 125 ℃, and the curing time is 30 min;
(8) and (5) carrying out bridge cutting on the aluminum alloy base material subjected to glue injection to obtain a finished product.
Example 3
(1) Placing the glue injection notch of the aluminum alloy base material upwards, and performing coarse sand treatment by adopting shot blasting with the particle size of 0.3mm to form a sand surface on the surface of the glue injection notch;
(2) washing an aluminum alloy substrate with water, performing oil removal pretreatment, washing with water, forming a passivation film, washing with water, and drying in sequence, wherein the oil removal etching amount is 2.0g/m2(ii) a The passivating agent is a chromium phosphate passivating agent;
(3) diluting the primer by using a diluent until the viscosity is 13', spraying the primer on the surface of the profile by using spraying equipment to form a layer of coating film, wherein the thickness of the coating film is controlled to be 12 mu m, the primer is a PVDF (polyvinylidene fluoride) fluorocarbon coating, the raw material of the PVDF fluorocarbon coating comprises resin, the resin comprises fluorocarbon resin, and the fluorocarbon resin accounts for 75% of the total resin;
(4) diluting the finish paint by using a diluent until the viscosity is 23', spraying the finish paint on the surface of the profile by using spraying equipment to form a layer of coating film, wherein the thickness of the coating film is controlled to be 30 mu m, the finish paint is a PVDF (polyvinylidene fluoride) fluorocarbon coating, the raw material of the PVDF fluorocarbon coating comprises resin, the resin comprises fluorocarbon resin, and the proportion of the fluorocarbon resin in the total resin is 75%;
(5) and (3) curing the aluminum alloy substrate which is sprayed with the finish paint and dried at the curing temperature: 235 ℃, curing time: curing for 12 min;
(6) embossing the glue injection notch of the solidified aluminum alloy substrate, and forming a concave tooth opening at the edge of the glue injection notch, wherein the concave tooth opening is discontinuous concave points, the distance between the concave points is 0.9cm, and the depth of the concave points is 0.25 mm;
(7) injecting heat-insulating glue into the glue injection notch through a glue injection machine, drying and solidifying, wherein the included angle between a glue injection nozzle of the glue injection machine and the glue injection notch is 80 degrees, the distance between the glue injection nozzle and the glue injection notch is 8mm, the rotating speed of a stirring head of the glue injection machine is 4000 revolutions per minute, and the temperature of the heat-insulating glue is 25 ℃; the curing temperature of the heat-insulating glue is 140 ℃, and the curing time is 30 min;
(8) and (5) carrying out bridge cutting on the aluminum alloy base material subjected to glue injection to obtain a finished product.
Example 4
(1) Placing the glue injection notch of the aluminum alloy base material upwards, and performing coarse sand treatment by adopting shot blasting with the particle size of 0.3mm to form a sand surface on the surface of the glue injection notch;
(2) washing an aluminum alloy substrate with water, performing oil removal pretreatment, washing with water, forming a passivation film, washing with water, and drying in sequence, wherein the oil removal etching amount is 1.6g/m2(ii) a The passivating agent is a chromium phosphate passivating agent;
(3) diluting the primer by using a diluent until the viscosity is 15', spraying the primer on the surface of the profile by using spraying equipment to form a layer of coating film, wherein the thickness of the coating film is controlled to be 7 mu m, the primer is a PVDF (polyvinylidene fluoride) fluorocarbon coating, the raw material of the PVDF fluorocarbon coating comprises resin, the resin comprises fluorocarbon resin, and the fluorocarbon resin accounts for 80% of the total resin;
(4) diluting the finish paint with a diluent until the viscosity is 25', spraying the finish paint on the surface of the profile by using spraying equipment to form a layer of coating film, wherein the thickness of the coating film is controlled to be 35 mu m, the finish paint is PVDF fluorocarbon paint, the raw material of the PVDF fluorocarbon paint comprises resin, the resin comprises fluorocarbon resin, and the proportion of the fluorocarbon resin in the total resin is 80%;
(5) and (3) curing the aluminum alloy substrate which is sprayed with the finish paint and dried at the curing temperature: 240 ℃, curing time: curing for 15 min;
(6) embossing the glue injection notch of the solidified aluminum alloy substrate, and forming a concave tooth opening at the edge of the glue injection notch, wherein the concave tooth opening is discontinuous concave points, the distance between the concave points is 0.6cm, and the depth of the concave points is 0.3 mm;
(7) injecting heat-insulating glue into the glue injection notch through a glue injection machine, drying and solidifying, wherein the included angle between a glue injection nozzle of the glue injection machine and the glue injection notch is 85 degrees, the distance between the glue injection nozzle and the glue injection notch is 10mm, the rotating speed of a stirring head of the glue injection machine is 4000 revolutions per minute, and the temperature of the heat-insulating glue is 26 ℃; the curing temperature of the heat-insulating glue is 130 ℃, and the curing time is 35 min;
(8) and (5) carrying out bridge cutting on the aluminum alloy base material subjected to glue injection to obtain a finished product.
The technical tests of examples 1-4 showed the following results:
the results, based on example 2, compared with the techniques of comparative examples 1 to 3 are as follows:
comparative example 1
Comparative example 1 is different from example 2 in that no grit treatment was used and a chemical grit method was used to form a grit surface on the surface by alkaline etching;
(1) forming a sand surface on the aluminum alloy substrate by a chemical sand surface method, wherein the chemical sand surface solution comprises NH4HF2100-120g/L, 20-40g/L ammonium salt and 8-10g/L additive;
(2) washing an aluminum alloy substrate with water, performing oil removal pretreatment, washing with water, forming a passivation film, washing with water, and drying in sequence, wherein the oil removal etching amount is 1.8g/m2(ii) a The passivating agent is a chromium phosphate passivating agent;
(3) diluting the primer by using a diluent until the viscosity is 12', spraying the primer on the surface of the profile by using spraying equipment to form a layer of coating film, wherein the thickness of the coating film is controlled to be 10 mu m, the primer is a PVDF (polyvinylidene fluoride) fluorocarbon coating, the raw material of the PVDF fluorocarbon coating comprises resin, the resin comprises fluorocarbon resin, and the proportion of the fluorocarbon resin in the total resin is 70%;
(4) diluting the finish paint with a diluent until the viscosity is 22', spraying the finish paint on the surface of the profile by using spraying equipment to form a layer of coating film, wherein the thickness of the coating film is controlled to be 25 mu m, the finish paint is PVDF fluorocarbon paint, the raw material of the PVDF fluorocarbon paint comprises resin, the resin comprises fluorocarbon resin, and the proportion of the fluorocarbon resin in the total resin is 70%;
(5) and (3) curing the aluminum alloy substrate which is sprayed with the finish paint and dried at the curing temperature: 235 ℃, curing time: curing for 8 min;
(6) embossing the glue injection notch of the solidified aluminum alloy substrate, and forming a concave tooth opening at the edge of the glue injection notch, wherein the concave tooth opening is discontinuous concave points, the distance between the concave points is 0.8cm, and the depth of the concave points is 0.3 mm;
(7) injecting heat-insulating glue into the glue injection notch through a glue injection machine, drying and curing, wherein the included angle between a glue injection nozzle of the glue injection machine and the glue injection notch is 78 degrees, the distance between the glue injection nozzle and the glue injection notch is 7mm, the rotating speed of a stirring head of the glue injection machine is 3600 r/min, and the temperature of the heat-insulating glue is 24 ℃; the curing temperature of the heat-insulating glue is 125 ℃, and the curing time is 30 min;
(8) and (5) carrying out bridge cutting on the aluminum alloy base material subjected to glue injection to obtain a finished product.
Comparative example 2
Compared with the embodiment 2, the difference of the comparative example 1 is that the glue injection notch of the aluminum alloy base material is not subjected to embossing treatment, and the edge of the glue injection notch is not provided with a notch;
(1) placing the glue injection notch of the aluminum alloy base material upwards, and performing coarse sand treatment by adopting shot blasting with the particle size of 0.2mm to form a sand surface on the surface of the glue injection notch;
(2) washing an aluminum alloy substrate with water, performing oil removal pretreatment, washing with water, forming a passivation film, washing with water, and drying in sequence, wherein the oil removal etching amount is 1.8g/m2(ii) a The passivating agent is a chromium phosphate passivating agent;
(3) diluting the primer by using a diluent until the viscosity is 12', spraying the primer on the surface of the profile by using spraying equipment to form a layer of coating film, wherein the thickness of the coating film is controlled to be 10 mu m, the primer is a PVDF (polyvinylidene fluoride) fluorocarbon coating, the raw material of the PVDF fluorocarbon coating comprises resin, the resin comprises fluorocarbon resin, and the proportion of the fluorocarbon resin in the total resin is 70%;
(4) diluting the finish paint with a diluent until the viscosity is 22', spraying the finish paint on the surface of the profile by using spraying equipment to form a layer of coating film, wherein the thickness of the coating film is controlled to be 25 mu m, the finish paint is PVDF fluorocarbon paint, the raw material of the PVDF fluorocarbon paint comprises resin, the resin comprises fluorocarbon resin, and the proportion of the fluorocarbon resin in the total resin is 70%;
(5) and (3) curing the aluminum alloy substrate which is sprayed with the finish paint and dried at the curing temperature: 235 ℃, curing time: curing for 8 min;
(6) injecting heat-insulating glue into the glue injection notch through a glue injection machine, drying and curing, wherein the included angle between a glue injection nozzle of the glue injection machine and the glue injection notch is 78 degrees, the distance between the glue injection nozzle and the glue injection notch is 7mm, the rotating speed of a stirring head of the glue injection machine is 3600 r/min, and the temperature of the heat-insulating glue is 24 ℃; the curing temperature of the heat-insulating glue is 125 ℃, and the curing time is 30 min;
(7) and (5) carrying out bridge cutting on the aluminum alloy base material subjected to glue injection to obtain a finished product.
Comparative example 3
Compared with the embodiment 2, the difference of the comparative example 3 is that embossing is carried out on the glue injection notch of the aluminum alloy substrate, and the space and the depth of the concave tooth notch formed on the edge of the glue injection notch do not meet the requirements of the invention;
(1) placing the glue injection notch of the aluminum alloy base material upwards, and performing coarse sand treatment by adopting shot blasting with the particle size of 0.2mm to form a sand surface on the surface of the glue injection notch;
(2) washing an aluminum alloy substrate with water, performing oil removal pretreatment, washing with water, forming a passivation film, washing with water, and drying in sequence, wherein the oil removal etching amount is 1.8g/m2(ii) a The passivating agent is a chromium phosphate passivating agent;
(3) diluting the primer by using a diluent until the viscosity is 12', spraying the primer on the surface of the profile by using spraying equipment to form a layer of coating film, wherein the thickness of the coating film is controlled to be 10 mu m, the primer is a PVDF (polyvinylidene fluoride) fluorocarbon coating, the raw material of the PVDF fluorocarbon coating comprises resin, the resin comprises fluorocarbon resin, and the proportion of the fluorocarbon resin in the total resin is 70%;
(4) diluting the finish paint with a diluent until the viscosity is 22', spraying the finish paint on the surface of the profile by using spraying equipment to form a layer of coating film, wherein the thickness of the coating film is controlled to be 25 mu m, the finish paint is PVDF fluorocarbon paint, the raw material of the PVDF fluorocarbon paint comprises resin, the resin comprises fluorocarbon resin, and the proportion of the fluorocarbon resin in the total resin is 70%;
(5) and (3) curing the aluminum alloy substrate which is sprayed with the finish paint and dried at the curing temperature: 235 ℃, curing time: curing for 8 min;
(6) embossing a glue injection notch of the solidified aluminum alloy substrate, and forming a concave tooth opening at the edge of the glue injection notch, wherein the concave tooth opening is discontinuous concave points, the distance between the concave points is 2cm, and the depth of the concave points is 0.1 mm;
(7) injecting heat-insulating glue into the glue injection notch through a glue injection machine, drying and curing, wherein the included angle between a glue injection nozzle of the glue injection machine and the glue injection notch is 78 degrees, the distance between the glue injection nozzle and the glue injection notch is 7mm, the rotating speed of a stirring head of the glue injection machine is 3600 r/min, and the temperature of the heat-insulating glue is 24 ℃; the curing temperature of the heat-insulating glue is 125 ℃, and the curing time is 30 min;
(8) and (5) carrying out bridge cutting on the aluminum alloy base material subjected to glue injection to obtain a finished product.
Comparative examples 1 to 3 were subjected to technical tests, and the results were as follows:
the standard is GB/T5237.6-2017 part 6 of aluminum alloy building section bar: heat insulation section bar.
It should be noted that, in examples 1 to 4 and comparative examples 1 to 3, the same type of insulating glue was used from the same manufacturer, and the manufacturer and the type of the insulating glue were subsonic grade i insulating glue.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. The preparation method of the heat-insulating aluminum alloy profile is characterized by comprising the following steps of:
carrying out sand blasting treatment on a glue injection notch of the aluminum alloy base material, and forming a sand surface on the surface of the glue injection notch;
carrying out passivation pretreatment on the aluminum alloy base material subjected to sand blasting treatment;
performing primer spraying treatment on the aluminum alloy substrate subjected to passivation pretreatment by using PVDF (polyvinylidene fluoride) fluorocarbon coating, and drying;
spraying a surface paint on the aluminum alloy substrate sprayed with the primer by using a PVDF fluorocarbon coating, and drying;
curing the aluminum alloy base material after being sprayed with the finish paint and dried;
embossing the glue injection notch of the solidified aluminum alloy substrate to form a concave tooth notch at the edge of the glue injection notch;
injecting heat-insulating glue into the glue injection notch, and drying and curing;
and (5) carrying out bridge cutting on the aluminum alloy base material subjected to glue injection to obtain a finished product.
2. The method for preparing the heat-insulating aluminum alloy profile as claimed in claim 1, wherein the sand blasting the glue injection notch of the aluminum alloy substrate comprises:
placing the glue injection notch of the aluminum alloy base material upwards;
and performing coarse sand treatment by adopting shot blasting with the particle size of 0.1-0.5 mm, and forming a sand surface on the surface of the glue injection notch.
3. The method of making an insulated aluminum alloy profile of claim 1, wherein the passivating pretreatment comprises:
washing the aluminum alloy base material with water;
the cleaned aluminum alloy base material is subjected to oil removal pretreatment, surface oil stains are removed, and the oil removal etching amount is more than or equal to 1.5g/m2；
Washing the aluminum alloy base material with water;
forming a passivation film on the surface of the aluminum alloy substrate;
washing the aluminum alloy base material with water;
and drying the aluminum alloy base material.
4. The preparation method of the heat-insulating aluminum alloy profile as claimed in claim 1, wherein the raw materials of the PVDF fluorocarbon coating selected for the primer comprise resin, wherein the resin comprises 35-50% of fluorocarbon resin, 10-20% of acrylic resin and 16-30% of epoxy resin or polyester resin;
the PVDF fluorocarbon coating used as the finishing coat is prepared from resin, wherein the resin comprises 69-72% of fluorocarbon resin and 28-31% of acrylic resin.
5. The preparation method of the heat-insulating aluminum alloy profile as claimed in claim 4, wherein the primer is PVDF fluorocarbon coating with the viscosity of 10-15', and the thickness of a coating film formed by the primer is 5-15 μm;
the finish paint is a PVDF (polyvinylidene fluoride) fluorocarbon coating with the viscosity of 18-25', and the thickness of a coating film formed by the finish paint is 20-35 mu m;
the spraying process of the primer and the finish paint is controlled to be 40 KV-90 KV, the spraying distance is 250-350 mm, and the atomizing air pressure is 0.1-0.2 MPa.
6. The preparation method of the heat-insulating aluminum alloy profile as claimed in claim 4, wherein the finish paint and the primer paint are dried after being sprayed, and the drying time is 5-10 min;
and drying the finish paint and the primer and then carrying out high-temperature curing treatment, wherein the curing temperature is 220-240 ℃, and the curing time is 5-15 min.
7. The method of making an insulated aluminum alloy profile of claim 1, wherein the scalloped openings are intermittent pits with a pitch of less than 1cm and a pit depth of greater than 0.2 mm.
8. The method of making an insulated aluminum alloy profile of claim 7, wherein the cross-section of the pits is arc-shaped.
9. The preparation method of the heat-insulating aluminum alloy profile as claimed in claim 1, wherein the heat-insulating glue is injected into the glue injection notch through a glue injection machine, wherein an included angle between a glue injection nozzle of the glue injection machine and the glue injection notch is 75-85 degrees, the distance between the glue injection nozzle and the glue injection notch is 5-10 mm, the rotating speed of a stirring head of the glue injection machine is 3500-4000 r/min, and the temperature of the heat-insulating glue is 23 ℃ +/-5 ℃.
10. The preparation method of the heat-insulating aluminum alloy section bar as claimed in claim 9, wherein the curing temperature of the heat-insulating glue is 120-140 ℃ and the time is not less than 30 min.
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