CN114308593A - Fluorocarbon paint spraying method for aluminum alloy pedestrian overpass section - Google Patents
Fluorocarbon paint spraying method for aluminum alloy pedestrian overpass section Download PDFInfo
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Abstract
The invention discloses a fluorocarbon paint spraying method for aluminum alloy pedestrian bridge section bars, which comprises the steps of carrying out online fluorocarbon self-drying paint spraying on aluminum alloy section bars with smaller common wall thickness and sections, adopting three-coating process of aluminum-color epoxy primer, light aluminum-color fluorocarbon finish paint and polyurethane varnish, then baking, airing, inspecting and packaging; and (3) carrying out on-site fluorocarbon self-drying paint spraying on the aluminum alloy section with the thicker wall thickness or the larger section, carrying out on-site fluorocarbon self-drying paint spraying on the paint and the paint film according to the requirements of the on-line fluorocarbon self-drying paint spraying method, naturally airing after spraying, and inspecting. The method carries out online fluorocarbon paint spraying and on-site fluorocarbon paint spraying treatment on the aluminum alloy pedestrian bridge section, and the paint spraying adopts three coating processes of epoxy resin primer, fluorocarbon finish paint and polyurethane varnish, so that the problems of yellowing caused by baking of the aluminum alloy section and online paint spraying failure of the section with thicker wall thickness and the section with larger section assembly section are solved, and the weather resistance and the aesthetic degree of the aluminum alloy pedestrian bridge section are enhanced.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy paint spraying methods, and particularly relates to a fluorocarbon paint spraying method for aluminum alloy pedestrian bridge profiles.
Background
The aluminum alloy pedestrian bridge has the characteristics of being prefabricated, assembled, quickly installed, low in maintenance cost, not prone to corrosion and the like, and gradually replaces the pedestrian bridge made of cement and steel. At present, the main surface treatment mode of the aluminum alloy pedestrian overpass is online powder spraying or fluorocarbon paint spraying, the wall thickness is 15mm conventionally, but the wall thickness of partial section bars is thicker, the maximum wall thickness can reach 40mm, and because the size of a curing furnace is smaller, the section bars with thicker wall thickness and the section bars with larger sections adopt a construction site spraying method, online spraying is not adopted, only fluorocarbon paint is adopted during site spraying, and the surface quality is not ideal.
The existing aluminum alloy section online fluorocarbon spraying process usually adopts a chain speed of 0.7-1.2m/min at 230 ℃ to ensure the curing effect, and the curing and curing are easy to generate yellowing phenomenon at the chain speed, so that the color difference defect is caused, and the integral appearance surface quality is influenced.
Disclosure of Invention
The invention aims to solve the problems that the baking and curing of an aluminum alloy overpass section bar are easy to cause rough surface, color difference and poor curing, and the performances such as coating adhesive force, weather resistance and the like are influenced, and the problems that the wall thickness is thick and the field paint spraying effect of an assembly aluminum alloy section bar with a large section is not ideal.
The purpose of the invention is realized by the following technical scheme:
a fluorocarbon paint spraying method for aluminum alloy pedestrian overpass sections comprises online fluorocarbon self-drying paint spraying and fluorocarbon self-drying paint spraying on a construction site;
the method for spraying the online fluorocarbon self-drying paint comprises the following steps:
carrying out surface polishing treatment on an aluminum alloy section with a small common wall thickness and section, then carrying out pretreatment, upper discharge, oil removal, water washing, chromizing or chromium-free passivation, drying and lower discharge; the pretreated aluminum alloy section is subjected to online fluorocarbon self-drying paint spraying, the fluorocarbon self-drying paint spraying adopts a three-coating process, aluminum-color epoxy primer, light aluminum-color fluorocarbon finish paint and polyurethane varnish are sequentially sprayed on the aluminum alloy section, and the aluminum-color epoxy primer is prepared by mixing the following components in a volume ratio of 3: 1, wherein the light aluminum fluorocarbon finish paint comprises a component A and a component B of the epoxy resin primer paint, and the volume ratio of the light aluminum fluorocarbon finish paint is 17: 1, the polyurethane varnish consists of a component A and a component B in a volume ratio of 3: 1, uniformly mixing two components of paint, diluting the mixture by using a diluent, spraying the mixture on an aluminum alloy section bar in an upward mode, and baking the aluminum alloy section bar after the spraying is finished so as to enable a paint film to be flat and volatilize a solvent; the aluminum alloy section is cooled, dried, discharged downwards, subjected to surface inspection and packaged;
the aluminum epoxy primer is diluted by a diluent which is 20 percent of the total volume of the epoxy resin primer component A and the component B, the light aluminum fluorocarbon finish paint is diluted by a diluent which is 30 percent of the total volume of the fluorocarbon finish paint component A and the component B, and the polyurethane varnish is diluted by a diluent which is 10 percent of the total volume of the polyurethane varnish component A and the component B; the component B is a curing agent;
the method for spraying the fluorocarbon self-drying paint on the construction site comprises the following steps:
and (3) for the aluminum alloy section with thicker wall thickness or larger section, after field installation, polishing the surface and wiping the surface with alcohol, carrying out field fluorocarbon self-drying paint spraying according to the requirements of the online fluorocarbon self-drying paint spraying method on the paint and the paint film, and naturally airing and inspecting the sprayed aluminum alloy section.
Preferably, in the online fluorocarbon self-drying paint spraying method, the aluminum alloy section with the smaller common wall thickness and section is an aluminum alloy section with the wall thickness of 3.5-15mm and the size capable of being placed in a curing furnace for baking and curing;
in the method for spraying the fluorocarbon self-drying paint on the construction site, the aluminum alloy section with thicker wall thickness or larger section is an aluminum alloy section with the wall thickness larger than 15mm or the size which can not be put into a curing furnace for baking and curing.
Preferably, in the online fluorocarbon self-drying paint spraying method, the surface polishing treatment adopts a sand blasting method, and carborundum in the cavity of the profile is blown away by compressed air after sand blasting.
Preferably, in the online fluorocarbon self-drying paint spraying method, the drying temperature is 80-100 ℃ and the time is 20-30 min.
Preferably, in the method for spraying the online fluorocarbon self-drying paint, the component B is an amine curing agent, and the diluent is toluene, xylene or butanone;
the thickness of the paint film of the aluminum epoxy primer, the light aluminum fluorocarbon finish paint and the polyurethane varnish is respectively 5-8 μm, more than or equal to 25 μm and 10-13 μm.
Preferably, in the online fluorocarbon self-drying paint spraying method, the baking is carried out in a curing oven, the temperature of the curing oven is 100 ℃, the chain speed is 1-1.5m/min, and the baking time is 30 min.
Preferably, in the online fluorocarbon self-drying paint spraying method, the surface inspection comprises the surface drying effect of the aluminum alloy profile self-drying paint, the leveling effect of the coating surface, the gloss, the color difference, the film thickness, the orange peel and the surface pattern defects of the coating.
Preferably, in the online fluorocarbon self-drying paint spraying method, the packaging method comprises the following steps: pasting a film on the decorative surface of the aluminum alloy section, wrapping single pearl cotton, packaging with straight paper, and finally bundling with battens.
Preferably, in the method for spraying the fluorocarbon self-drying paint on the construction site, the surface is polished by a pneumatic polisher.
Preferably, in the method for spraying the fluorocarbon self-drying paint on the construction site, the paint film adhesion of the aluminum alloy section is tested.
The fluorocarbon paint for the conventional aluminum alloy pedestrian overpass does not contain a curing agent, and the curing temperature is over 230 ℃, so that the problems of yellowing of the surface of the aluminum alloy pedestrian overpass, low adhesive force, poor weather resistance and the like are easily caused. The aluminum alloy pedestrian overpass section bar spraying process adds a certain proportion of curing agent into paint, reduces curing temperature, shortens curing time, realizes on-line production and on-site construction, solves the problems of yellowing of the surface of a paint film and poor effect caused by baking in the paint spraying process, improves the appearance quality of the aluminum alloy overpass on the basis of ensuring weather resistance, has more beautiful surface effect, and is particularly suitable for the paint spraying process of an assembly section bar with thicker wall thickness and larger section.
The invention has the following beneficial effects:
according to the fluorocarbon paint spraying method for the aluminum alloy pedestrian bridge section, online fluorocarbon self-drying paint spraying and on-site fluorocarbon self-drying paint spraying treatment are carried out on the aluminum alloy pedestrian bridge section, and the three-coating process of the epoxy resin primer, the fluorocarbon finish paint and the polyurethane varnish is adopted for paint spraying, so that the yellowing problem caused by baking the aluminum alloy section after online fluorocarbon self-drying paint spraying and the problem that the section with thicker wall thickness and the section with larger section cannot be sprayed on line are solved, the weather resistance of the aluminum alloy pedestrian bridge section is enhanced, and the surface performance and the aesthetic degree are improved.
Drawings
FIG. 1 is a process flow diagram of a fluorocarbon painting method for aluminum alloy pedestrian overpass profiles of the invention.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
The raw materials in the examples were commercially available without specific indication.
Example 1
A fluorocarbon paint spraying method for an aluminum alloy pedestrian overpass section comprises the following specific steps:
(1) surface polishing treatment
Taking an HJ125001 overpass aluminum alloy section (the wall thickness is 3.5-15mm, the maximum wall thickness is 39.5 mm) as an example, carrying out sand blasting treatment on an aluminum alloy section with the wall thickness of 3.5-15mm and capable of entering a curing furnace to be baked and cured, polishing the aluminum alloy section with poor surface quality or surface scratches, and blowing away carborundum in a section cavity by using compressed air after sand blasting.
(2) Deoiling, washing, chromizing/chromium-free passivating and drying
After the aluminum alloy section is deeply processed, severe oil stains at a punched hole are wiped clean by alcohol, then groove soaking oil removing treatment is carried out, acid oil removing agents such as commercially available aluminum alloy acid oil removing agents are used for oil removing, the oil removing time is 30min, chromate chromizing treatment is carried out for 3-5min after washing with tap water, or passivation treatment is carried out for 30-60s by using chromium-free aluminum alloy passivation solution, then drying is carried out at the temperature of 80-100 ℃, the drying time is 20-30min, and complete drying of the surface after downward discharge is guaranteed.
(3) Online fluorocarbon self-drying paint spraying
a. The self-drying paint spraying adopts a three-coating process, wherein the components of the aluminum epoxy primer, the light aluminum fluorocarbon finish paint and the polyurethane varnish are respectively epoxy resin primer component A and component B, fluorocarbon finish paint component A and component B, and polyurethane varnish component A and component B; the component B is an amine curing agent; the paint is diluted by a diluent in use, and the diluent comprises but is not limited to toluene, xylene and butanone.
b. And (4) spraying an upper row, and selecting a proper hanging tool according to the structure of the aluminum alloy section, wherein 2-4 hanging materials are generally hung in each row.
c. When the paint component A and the paint component B are mixed according to the proportion, the paint component A and the paint component B can only be used for 3 to 4 hours generally, and can be solidified and deteriorated after the time exceeds 4 hours, and when the production is stopped, the paint supply pipeline of the spray gun is cleaned by using a corresponding diluent. The amounts and proportions of the paints are given in the following table.
| Kind of coating | Component A | Component B | Diluent |
| Primer coating | 7.5L（3） | 2.5L（1） | 2L（20%） |
| Finish paint | 8.5L（17） | 0.5L（1） | 2.7L（30%） |
| Varnish | 5L（3） | 1.7L（1） | 0.67（10%） |
d. The paint two-component is uniformly mixed according to a proportion, diluted to construction viscosity by a diluent, and the paint viscosity is finely adjusted according to a paint atomizing effect and a decoration surface leveling effect.
e. Because the number of hung materials in each row is small, the aluminum epoxy primer and the light aluminum fluorocarbon finish paint are mainly sprayed by a manual gun or an electrostatic gun (low voltage); the polyurethane varnish is sprayed by adopting an automatic rotary cup. According to the size of the sprayed decorative surface, the paint amount and the number of the spray guns are determined, the spraying time of the epoxy primer, the fluorocarbon finish paint and the polyurethane varnish is 5s, the thickness of the epoxy primer is 5-8 mu m, the thickness of the fluorocarbon finish paint is more than or equal to 25 mu m, and the thickness of the polyurethane varnish is 10-13 mu m.
f. The air-drying paint spraying and baking process parameters are that the temperature of the curing furnace is set to be 100 ℃, the chain speed is set to be 1-1.5m/min, and the baking time is 30min, so that the leveling of a paint film and the sufficient volatilization of a solvent are ensured.
(4) Cooling, discharging, inspecting, and packaging
a. Discharging the aluminum alloy section from the furnace, cooling and then discharging. Confirming the surface drying effect of the self-drying paint coating; and (3) sequentially arranging the large aluminum alloy section materials at the lower part on a skip car, and enabling the non-decorative surface to lean against a skip felt.
b. Inspecting items such as the leveling effect of the surface of the coating, the gloss, the color difference and the film thickness of the coating; and (5) inspecting the defects of the orange peel and the dough flower of the coating.
c. Pasting a film on the decorative surface of the section bar, wrapping single pearl cotton, packaging with straight paper, and finally bundling with battens.
(5) Fluorocarbon self-drying paint spraying process for construction site
And (3) after the assembly aluminum alloy section bar with the wall thickness larger than 15mm or the section size larger than the section size and incapable of being baked and cured is well installed on site, polishing by a pneumatic polishing machine and wiping by alcohol, immediately spraying paint according to the requirements of the paint and the spraying thickness in the step (3), naturally airing, and inspecting the paint film adhesive force of the aluminum alloy section bar by dry scratching.
The performance of the fluorocarbon self-drying paint spraying product of the embodiment
a. The pencil hardness is not less than 1H; the impact resistance is 50cm kg positive impact qualified.
b. Acid resistance (50 g/L, H)2SO4) Or alkali resistance (50 g/L, NaOH), and the coating has no abnormality after 168 hours.
c. Through a neutral salt spray test for 1000h, the coating does not foam and fall off; the coating has the advantages of good weather resistance (3000 h) or natural weather exposure (3 years), no bubbling, no shedding, no cracking, no powdering, and delta E﹡Less than or equal to 6.0 percent and the light-preserving rate is more than or equal to 50 percent.
In the prior art, the conventional fluorocarbon paint is used for spraying the aluminum alloy pedestrian bridge section, the curing temperature is required to be over 230 ℃, the temperature rise of the ultra-thick material or the aluminum alloy section with a larger section is slower in curing, the surface roughness, the color difference and the poor curing are easily caused, and the performances such as the coating adhesive force, the weather resistance and the like are influenced. The invention adopts online fluorocarbon self-drying paint spraying and on-site fluorocarbon self-drying paint spraying to perform paint spraying treatment on the overpass aluminum alloy section, and the aluminum alloy section is sequentially sprayed with the aluminum-color epoxy primer, the light aluminum-color fluorocarbon finish paint and the polyurethane varnish which are specially composed, thereby solving the problem of poor surface effect and weather resistance of the aluminum alloy pedestrian overpass fluorocarbon paint spraying process in the prior art, and improving the weather resistance and the aesthetic degree of the aluminum alloy pedestrian overpass.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A fluorocarbon paint spraying method for aluminum alloy pedestrian overpass sections is characterized by comprising online fluorocarbon self-drying paint spraying and fluorocarbon self-drying paint spraying on a construction site;
the method for spraying the online fluorocarbon self-drying paint comprises the following steps:
carrying out surface polishing treatment on an aluminum alloy section with a small common wall thickness and section, then carrying out pretreatment, upper discharge, oil removal, water washing, chromizing or chromium-free passivation, drying and lower discharge; the pretreated aluminum alloy section is subjected to online fluorocarbon self-drying paint spraying, the fluorocarbon self-drying paint spraying adopts a three-coating process, aluminum-color epoxy primer, light aluminum-color fluorocarbon finish paint and polyurethane varnish are sequentially sprayed on the aluminum alloy section, and the aluminum-color epoxy primer is prepared by mixing the following components in a volume ratio of 3: 1, wherein the light aluminum fluorocarbon finish paint comprises a component A and a component B of the epoxy resin primer paint, and the volume ratio of the light aluminum fluorocarbon finish paint is 17: 1, the polyurethane varnish consists of a component A and a component B in a volume ratio of 3: 1, uniformly mixing two components of paint, diluting the mixture by using a diluent, spraying the mixture on an aluminum alloy section bar in an upward mode, and baking the aluminum alloy section bar after the spraying is finished so as to enable a paint film to be flat and volatilize a solvent; the aluminum alloy section is cooled, dried, discharged downwards, subjected to surface inspection and packaged;
the aluminum epoxy primer is diluted by a diluent which is 20 percent of the total volume of the epoxy resin primer component A and the component B, the light aluminum fluorocarbon finish paint is diluted by a diluent which is 30 percent of the total volume of the fluorocarbon finish paint component A and the component B, and the polyurethane varnish is diluted by a diluent which is 10 percent of the total volume of the polyurethane varnish component A and the component B; the component B is a curing agent;
the method for spraying the fluorocarbon self-drying paint on the construction site comprises the following steps:
and (3) for the aluminum alloy section with thicker wall thickness or larger section, after field installation, polishing the surface and wiping the surface with alcohol, carrying out field fluorocarbon self-drying paint spraying according to the requirements of the online fluorocarbon self-drying paint spraying method on the paint and the paint film, and naturally airing and inspecting the sprayed aluminum alloy section.
2. The aluminum alloy pedestrian bridge profile fluorocarbon painting method according to claim 1, wherein in the online fluorocarbon self-drying paint spraying method, the aluminum alloy profile with a smaller common wall thickness and section is an aluminum alloy profile with a wall thickness of 3.5-15mm and a size capable of being placed in a curing furnace for baking and curing;
in the method for spraying the fluorocarbon self-drying paint on the construction site, the aluminum alloy section with thicker wall thickness or larger section is an aluminum alloy section with the wall thickness larger than 15mm or the size which can not be put into a curing furnace for baking and curing.
3. The aluminum alloy pedestrian bridge profile fluorocarbon painting method according to claim 1, wherein in the online fluorocarbon self-drying paint spraying method, the surface polishing treatment adopts a sand blasting method, and carborundum in the profile cavity is blown clean by compressed air after sand blasting.
4. The aluminum alloy pedestrian bridge profile fluorocarbon painting method according to claim 1, wherein in the online fluorocarbon self-drying paint spraying method, the drying temperature is 80-100 ℃ and the drying time is 20-30 min.
5. The aluminum alloy pedestrian bridge profile fluorocarbon painting method according to claim 1, wherein in the online fluorocarbon self-drying paint spraying method, the component B is an amine curing agent, and the diluent is toluene, xylene or butanone;
the thickness of the paint film of the aluminum epoxy primer, the light aluminum fluorocarbon finish paint and the polyurethane varnish is respectively 5-8 μm, more than or equal to 25 μm and 10-13 μm.
6. The aluminum alloy pedestrian bridge profile fluorocarbon painting method according to claim 1, wherein in the online fluorocarbon self-drying paint spraying method, the baking is performed in a curing oven, the temperature of the curing oven is 100 ℃, the chain speed is 1-1.5m/min, and the baking time is 30 min.
7. The aluminum alloy pedestrian bridge section fluorocarbon painting method according to claim 1, wherein in the online fluorocarbon self-drying paint spraying method, the surface inspection comprises the aluminum alloy section self-drying paint surface drying effect, the coating surface leveling effect, and the coating gloss, color difference, film thickness, coating orange peel and surface pattern defects.
8. The aluminum alloy pedestrian bridge profile fluorocarbon painting method according to claim 1, wherein in the online fluorocarbon self-drying paint spraying method, the packaging method comprises the following steps: pasting a film on the decorative surface of the aluminum alloy section, wrapping single pearl cotton, packaging with straight paper, and finally bundling with battens.
9. The aluminum alloy pedestrian bridge section fluorocarbon painting method according to claim 1, wherein in the method of fluorocarbon self-drying paint spraying at the construction site, the surface grinding is carried out by a pneumatic grinding machine.
10. The aluminum alloy pedestrian bridge profile fluorocarbon painting method according to claim 1, characterized in that in the method of fluorocarbon self-drying paint spraying at the construction site, the paint film adhesion of the aluminum alloy profile is tested.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114801409A (en) * | 2022-04-26 | 2022-07-29 | 广州中樱汽车零部件有限公司 | Production process of composite honeycomb board of automobile seat |
| CN114836757A (en) * | 2022-04-22 | 2022-08-02 | 北京柏盛名匠标识制作有限公司 | Metal label manufacturing method based on etching process |
| CN114888258A (en) * | 2022-05-18 | 2022-08-12 | 湖州羿中智能科技有限公司 | Aluminum alloy casting component formed by one-time die casting and processing method thereof |
| CN115213075A (en) * | 2022-05-19 | 2022-10-21 | 广东坚美铝型材厂（集团）有限公司 | Spraying method of aluminum alloy section and aluminum alloy section |
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| CN108380471A (en) * | 2018-05-04 | 2018-08-10 | 自贡东方彩钢结构有限公司 | A kind of proximate matter fluororine-carbon coating technique |
| CN112122087A (en) * | 2020-09-21 | 2020-12-25 | 肇庆新联昌金属实业有限公司 | Spraying preparation method for aluminum profile processing |
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| CN115213075A (en) * | 2022-05-19 | 2022-10-21 | 广东坚美铝型材厂（集团）有限公司 | Spraying method of aluminum alloy section and aluminum alloy section |
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