CN114573369B - Protective agent for concrete prefabricated part and preparation and performance detection method thereof - Google Patents
Protective agent for concrete prefabricated part and preparation and performance detection method thereof Download PDFInfo
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- CN114573369B CN114573369B CN202210191508.9A CN202210191508A CN114573369B CN 114573369 B CN114573369 B CN 114573369B CN 202210191508 A CN202210191508 A CN 202210191508A CN 114573369 B CN114573369 B CN 114573369B
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- 239000003223 protective agent Substances 0.000 title claims abstract description 89
- 239000004567 concrete Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 238000001514 detection method Methods 0.000 title abstract description 6
- 229910021538 borax Inorganic materials 0.000 claims abstract description 27
- 239000004328 sodium tetraborate Substances 0.000 claims abstract description 27
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 27
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 16
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 16
- XTIIITNXEHRMQL-UHFFFAOYSA-N tripotassium methoxy(trioxido)silane Chemical compound [K+].[K+].[K+].CO[Si]([O-])([O-])[O-] XTIIITNXEHRMQL-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000000853 adhesive Substances 0.000 claims abstract description 11
- 230000001070 adhesive effect Effects 0.000 claims abstract description 11
- 239000003513 alkali Substances 0.000 claims abstract description 9
- 230000035515 penetration Effects 0.000 claims abstract description 6
- 239000004566 building material Substances 0.000 claims abstract description 5
- 239000006185 dispersion Substances 0.000 claims description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 58
- 238000000034 method Methods 0.000 claims description 21
- IVKNZCBNXPYYKL-UHFFFAOYSA-N 2-[2-[2-[2-[2-[2-[2-[2-[2-[2-[4-(2,4,4-trimethylpentan-2-yl)phenoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethanol Chemical compound CC(C)(C)CC(C)(C)C1=CC=C(OCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO)C=C1 IVKNZCBNXPYYKL-UHFFFAOYSA-N 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 15
- 230000035699 permeability Effects 0.000 claims description 14
- 239000008367 deionised water Substances 0.000 claims description 13
- 229910021641 deionized water Inorganic materials 0.000 claims description 13
- 239000004111 Potassium silicate Substances 0.000 claims description 11
- BHGADZKHWXCHKX-UHFFFAOYSA-N methane;potassium Chemical compound C.[K] BHGADZKHWXCHKX-UHFFFAOYSA-N 0.000 claims description 11
- 239000003973 paint Substances 0.000 claims description 11
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 11
- 235000019353 potassium silicate Nutrition 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 238000010998 test method Methods 0.000 claims description 8
- 230000032683 aging Effects 0.000 claims description 6
- 230000001804 emulsifying effect Effects 0.000 claims description 5
- 239000000839 emulsion Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 229920003002 synthetic resin Polymers 0.000 claims description 3
- 239000000057 synthetic resin Substances 0.000 claims description 3
- 230000005856 abnormality Effects 0.000 claims description 2
- 239000000049 pigment Substances 0.000 claims description 2
- 239000011148 porous material Substances 0.000 abstract description 4
- 230000002209 hydrophobic effect Effects 0.000 abstract description 3
- 238000003756 stirring Methods 0.000 description 30
- 239000000047 product Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000006136 alcoholysis reaction Methods 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000005034 decoration Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000011178 precast concrete Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 239000001632 sodium acetate Substances 0.000 description 2
- 235000017281 sodium acetate Nutrition 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 206010021703 Indifference Diseases 0.000 description 1
- 229910004844 Na2B4O7.10H2O Inorganic materials 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 230000008451 emotion Effects 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical compound [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5006—Boron compounds
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
Landscapes
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Immunology (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Dispersion Chemistry (AREA)
- Ecology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to the field of building materials, in particular to a protective agent for a concrete prefabricated part and a preparation method and a performance detection method thereof. The protective agent comprises the following components in parts by weight: 15-40 parts of a first component and 10-25 parts of a second component; wherein the first component comprises (2-5) by weight: (1-3) the potassium methylsilicate and polyvinyl alcohol; the second component is borax. The protective agent has good penetration crystallinity, can effectively penetrate into an internal pore structure of a concrete member (especially a concrete prefabricated wallboard), forms an excellent hydrophobic layer, and has the functions of micro-expansion, compactness and hardness increase. When the concrete prefabricated external wall panel is used on the surface, the waterproofness, the adhesive force and the durability of the concrete prefabricated external wall panel can be obviously improved. Compared with the existing like products, the protective agent has the advantages of better weather resistance, stain resistance, alkali resistance, adhesive force and the like.
Description
Technical Field
The invention relates to the field of building materials, in particular to a protective agent for a concrete prefabricated part and a preparation method and a performance detection method thereof.
Background
The assembly type building refers to a high-quality modern building which integrates design, processing and assembly and integrates main body, building, mechanical and electrical functions and decoration, and parts such as walls, plates, columns, stairs, balconies, decorations, mechanical and electrical functions and the like are processed and manufactured in a factory and are assembled and constructed on site, so that a house is built just like a car. The main types of prefabricated buildings include prefabricated concrete structure buildings, steel structure buildings, modern wood structure buildings and the like. The prefabricated components of the prefabricated concrete structure building mainly comprise prefabricated external wall panels, internal wall panels, double-skin walls (used for an underground comprehensive pipe gallery), laminated slabs, stairs, balconies, air-conditioning panels and the like.
At present, the outer surface of the concrete prefabricated external wall panel can be finished with a very good fresh water effect in a factory, the surface of the concrete prefabricated external wall panel is flat and smooth, the color and luster are uniform, the edges and corners are distinct, the concrete prefabricated external wall panel not only has simple and natural and stable appearance lingering charm, but also can give people soft, rigid, warm and indifference feelings, and can express the building emotion. At present, prefabricated external wall panels with the effect are more and directly adopted for prefabricated concrete structures, and the surfaces of the prefabricated external wall panels do not need to be coated with any paint. However, the protection of the outer surface of the concrete prefabricated external wall panel is always one of the common quality defects which are difficult to overcome in application, and the protection directly influences the stain resistance, the durability, the decoration and the like of the application of the prefabricated external wall panel.
At present, the protective agent for the outer surface of the prefabricated external wall panel on the market is a water-based transparent liquid product prepared by taking acrylic polymer emulsion as a main film forming material and adding certain additives, and the protective agent is coated on the outer surface of the concrete prefabricated external wall panel to form a layer of transparent protective film, so that a certain waterproof and stain-resistant protective effect is achieved. However, the product has poor permeability, cannot penetrate into concrete pores to form good adhesion and has poor durability; secondly, the emulsion has lower vitrification temperature, generally between 30 and 40 ℃, and poor stain resistance, and influences the decorative effect and the durability of the external wall panel.
At present, a transparent protective agent which is used for the outer surface of a concrete prefabricated external wall panel and has high permeability and adhesive force, good waterproofness, stain resistance and durability needs to be prepared.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides a protective agent for a concrete prefabricated part and a preparation and performance detection method thereof.
The invention firstly provides a protective agent (or called as a protective agent for a concrete prefabricated part), which comprises the following components in parts by weight:
15-40 parts of first component
10-25 parts of a second component;
wherein the first component comprises (2-5) by weight: (1-3) potassium methylsilicate and polyvinyl alcohol, wherein the polyvinyl alcohol has an average polymerization degree of 1700-2400 and an alcoholysis degree of 88-99%;
the second component is borax.
The invention discovers that after the protective agent is compounded in the above mode, the penetration crystallinity of the protective agent can be synergistically improved, the contained silanol-based active substance can effectively penetrate into the internal pore structure of the precast concrete wallboard and can perform complex chemical reaction with components such as free calcium oxide in concrete to form an excellent hydrophobic layer, and meanwhile, the protective agent has a micro-expansion effect, is beneficial to increasing the compactness and hardness of the coated surface, and can obviously improve the waterproofness, adhesion and durability of the precast concrete external wallboard when used on the surface of the precast concrete external wallboard.
Preferably, the protective agent comprises the following components in parts by weight:
15-30 parts of first component
10-20 parts of a second component;
wherein the first component comprises (2-4) by weight: (1-2) potassium methylsilicate and polyvinyl alcohol, the polyvinyl alcohol having an average polymerization degree of 1700-2400 and an alcoholysis degree of 88-99%;
the second component is borax.
Preferably, the polyvinyl alcohol is PVA2488. Therefore, the durability and the antifouling performance of the protective agent are improved, and the protective agent can play a good role of a protective colloid for borax and methyl potassium silicate dispersoids.
Preferably, the protective agent further comprises: OP-10, wherein the weight ratio of the OP-10 to the methyl potassium silicate is (1-5): (10-25), more preferably (1-3): (10-20).
When OP-10 is used in the present invention in the above manner, the potassium methylsilicate has a superior emulsifying effect, thereby contributing to securing various properties of the protectant.
Preferably, the protective agent further comprises: deionized water, wherein the weight ratio of the deionized water to OP-10 to potassium methylsilicate is (9-25): (1-5): (10-25), more preferably (14-27): (1-3): (10-20).
Preferably, the protective agent further comprises: water, wherein the weight ratio of the water to the polyvinyl alcohol is (6-9): (1-3), more preferably (7-9): (1-2).
As a preferred embodiment of the invention, the protective agent comprises the following components in parts by weight:
more preferably, the protective agent comprises the following components in parts by weight:
in some preferred embodiments of the present invention, the methyl potassium silicate is a colorless transparent liquid in appearance, with a total solids content of 40%, a silicone content (active content) of 18%, a specific gravity (25 ℃) of 1.1, pH 13.
In some preferred embodiments of the invention, the borax is white fine crystalline with a density of 1.73g/cm 3 ，Na 2 B 4 O 7 ·10H 2 The O content is more than 99.5 percent.
In some preferred embodiments of the present invention, the PVA2488 has an average degree of polymerization of 2400, a degree of alcoholysis of 88% (mol/mol), a sodium acetate content of 2.5% or less, an ash content of 1% or less, a pH value of 5-7, a viscosity of 44.0-56.0mpa.s, a purity of 93.5% or more, a fineness of 80-200 mesh, a white powder appearance, and is readily soluble in water. When the epoxy resin composition is applied to the invention, the epoxy resin composition has good film forming property, emulsifying property, bonding property, excellent bonding force, solvent resistance, friction resistance, tensile strength and oxygen barrier property.
In some preferred embodiments of the invention, the OP-10 is a condensate of an alkylphenol and ethylene oxide having an HLB value of 14.5 and a cloud point of 61-67 ℃. When the composition is applied in the invention, the composition has good penetration and activity.
Another object of the present invention is to provide a method for preparing the protecting agent, which comprises:
emulsifying potassium methyl silicate to obtain dispersion 1;
dissolving polyvinyl alcohol to obtain a dispersion 2;
mixing said dispersion 1 with said dispersion 2 to obtain a mixed dispersion 3;
and (3) mixing borax with the mixed dispersoid 3 to obtain the pigment.
The invention also finds that when the protective agent is prepared by the preparation method, the synergistic effect of the components is further promoted, so that the decorative effect and the durability of the concrete prefabricated external wall panel are better.
Preferably, the preparation of the dispersion 1 comprises in particular: potassium methyl silicate, OP-10 and deionized water are emulsified at 200 to 400r/min, more preferably 300r/min, to give the dispersion 1.
Preferably, the emulsification time during the preparation of the dispersion 1 is 3 to 7min, more preferably 5min.
Preferably, the preparation of the dispersion 2 specifically comprises: polyvinyl alcohol and water are mixed at 400 to 600r/min, more preferably 500r/min, to obtain said dispersion 2.
Preferably, the mixing time during the preparation of the dispersion 2 is from 10 to 20min, more preferably 15min.
Preferably, the dispersion 1 and the dispersion 2 are mixed at 200 to 300r/min (more preferably 250 r/min). The mixing time is preferably 5 to 10min, more preferably 7min.
Preferably, borax is mixed with the mixed dispersion 3 at 100 to 200r/min (more preferably 150 r/min). The mixing time is preferably 5 to 10min, more preferably 7min.
In practice, the protective agent may be sieved by a screen of 200 meshes, for example, and then discharged.
The above-mentioned protocols can be combined by the skilled person in accordance with common general knowledge to obtain preferred embodiments relating to the preparation method of the present invention.
The invention also provides the application of the protective agent or the protective agent prepared by the preparation method of the protective agent on the surface of a concrete member; preferably in the application of prefabricated wall panel surface of prefabricated concrete building.
The invention also provides a performance detection method of the protective agent or the protective agent prepared by the preparation method of the protective agent, which comprises the following steps of testing the protective agent by using at least one of the following methods:
(1) The adhesion of the protective agent is tested by referring to GB/T1720-79 (89) paint film adhesion determination method (circle drawing method);
when the adhesive force is less than or equal to grade 1, judging that the adhesive force of the protective agent is qualified;
(2) At least one of the performances of the stain resistance, the artificial climate aging resistance and the alkali resistance of the protective agent is tested by referring to GB/T9755-2001 synthetic resin emulsion exterior wall coating;
when the test result of the stain resistance is less than or equal to 12 percent, judging that the stain resistance of the protective agent is qualified;
when the time length of no bubble, no peeling and no crack is more than or equal to 600h and the color change value is less than or equal to 1, judging that the artificial weather aging resistance of the protective agent is qualified;
when the abnormality does not occur for more than 48 hours in the alkali resistance test, judging that the alkali resistance of the protective agent is qualified;
(3) Testing the impermeability of the protective agent by adopting a Casston tube method;
when the water penetration depth after 2 hours under the action of the water column is less than or equal to 150cm, judging that the water impermeability of the protective agent is qualified;
(4) Testing the water and vapor permeability of the protective agent according to GB/T17146-2015 test method for the water vapor permeability of building materials and products thereof;
when the test result is more than or equal to 700g/m 2 And when the time is 24 hours, judging that the water and vapor permeability of the protective agent is qualified.
The invention has the beneficial effects that:
the protective agent has good penetration crystallinity, can effectively penetrate into an internal pore structure of a concrete member (especially a concrete prefabricated wallboard), forms an excellent hydrophobic layer, and has the functions of micro-expansion, compactness and hardness increase. When the concrete prefabricated external wall panel is used on the surface, the waterproofness, the adhesive force and the durability of the concrete prefabricated external wall panel can be obviously improved. Compared with the existing like products, the protective agent has the advantages of better weather resistance, stain resistance, alkali resistance, adhesive force and the like.
In addition, a paint film formed by the protective agent is colorless and transparent, does not change the color and the appearance of the outer surface of the external wall panel, and can keep the original appearance lingering charm; and the water is used as a dispersion medium, is nontoxic and tasteless, is harmless to the environment and human bodies, belongs to a green environment-friendly product, and has excellent environmental protection property.
Detailed Description
The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
OP-10, which is a condensate of an alkylphenol and ethylene oxide and used in the following specific examples of the present invention, has an HLB value of 14.5 and a cloud point of 61-67 ℃; the methyl potassium silicate is colorless transparent liquid in appearance, the total solid content is 40 percent, the silicone content (active matter content) is 18 percent, the specific gravity (25 ℃) is 1.1, and the pH value is 13; the polyvinyl alcohol PVA2488 has the average polymerization degree of 2400, the alcoholysis degree of 88% (mol/mol), the content of sodium acetate is less than or equal to 2.5 percent, the ash content is less than or equal to 1 percent, the pH value is 5-7, the viscosity is 44.0-56.0mpa.s, the purity is more than or equal to 93.5 percent, the fineness is 80-200 meshes, the appearance is white powder, and the polyvinyl alcohol PVA2488 is easily soluble in water; borax is a white fine crystal with a density of 1.73g/cm < 3 >, and the content of Na2B4O 7.10H 2O is more than 99.5%.
The examples do not specify particular techniques or conditions, and are to be construed in accordance with the description of the art in the literature or with the specification of the product. The reagents or instruments used are conventional products available from regular distributors, not indicated by the manufacturer.
Example 1
The embodiment firstly provides a protective agent, and the formula comprises the following components in percentage by weight:
this example further provides a preparation method of the above protecting agent, which specifically comprises the following steps:
firstly, adding deionized water, OP-10 and methyl potassium silicate into a dispersion tank, starting a stirrer, stirring at the speed of 300 revolutions per minute for 5 minutes to prepare a dispersion 1 for later use; then adding water and PVA2488 into a dispersion tank, adjusting the rotating speed of a stirrer to 500 revolutions per minute, and stirring for 15 minutes to prepare a dispersion 2 for later use; then adding the dispersion 1 and the dispersion 2 into a dispersion tank, starting a stirrer, stirring at the speed of 250 revolutions per minute, and stirring for 7 minutes; and (3) adjusting the rotation speed of the stirrer to 150 revolutions per minute, adding borax into the dispersion tank for stirring for 7 minutes, and then discharging through a 200-mesh screen to obtain the borax-containing water-based paint.
Example 2
The present invention first provides a protective agent, which comprises the following components by weight:
this example further provides a preparation method of the protective agent, which specifically includes:
firstly, adding deionized water, OP-10 and methyl potassium silicate into a dispersion tank, starting a stirrer, stirring at the speed of 300 revolutions per minute for 5 minutes to prepare a dispersion 1 for later use; then adding water and PVA2488 into a dispersion tank, adjusting the rotating speed of a stirrer to 500 revolutions per minute, and stirring for 15 minutes to prepare a dispersion 2 for later use; then adding the dispersion 1 and the dispersion 2 into a dispersion tank, starting a stirrer, stirring at the speed of 250 revolutions per minute, and stirring for 7 minutes; and (3) adjusting the rotation speed of the stirrer to 150 revolutions per minute, adding borax into the dispersion tank for stirring for 7 minutes, and then discharging through a 200-mesh screen to obtain the borax-containing water-based paint.
Example 3
The present invention first provides a protective agent, which comprises the following components by weight:
this example further provides a preparation method of the protective agent, which specifically includes:
firstly, adding deionized water, OP-10 and methyl potassium silicate into a dispersion tank, starting a stirrer, stirring at the speed of 300 revolutions per minute for 5 minutes to prepare a dispersion 1 for later use; then adding water and PVA2488 into a dispersion tank, adjusting the rotating speed of a stirrer to 500 revolutions per minute, and stirring for 15 minutes to prepare a dispersion 2 for later use; then adding the dispersion 1 and the dispersion 2 into a dispersion tank, starting a stirrer, stirring at a speed of 250 revolutions per minute and stirring for 7 minutes; and (3) adjusting the rotation speed of the stirrer to 150 revolutions per minute, adding borax into the dispersion tank for stirring for 7 minutes, and then discharging through a 200-mesh screen to obtain the borax-containing water-based paint.
Example 4
The embodiment firstly provides a protective agent, and the formula comprises the following components in percentage by weight:
this example further provides a preparation method of the above protecting agent, which specifically comprises the following steps:
firstly, adding deionized water, OP-10 and methyl potassium silicate into a dispersion tank, starting a stirrer, stirring at the speed of 300 revolutions per minute for 5 minutes to prepare a dispersion 1 for later use; then adding water and PVA2488 into a dispersion tank, adjusting the rotating speed of a stirrer to 500 revolutions per minute, and stirring for 15 minutes to prepare a dispersion 2 for later use; then adding the dispersion 1 and the dispersion 2 into a dispersion tank, starting a stirrer, stirring at the speed of 250 revolutions per minute, and stirring for 7 minutes; and (3) adjusting the rotation speed of the stirrer to 150 revolutions per minute, adding borax into the dispersion tank for stirring for 7 minutes, and then discharging through a 200-mesh screen to obtain the borax-containing water-based paint.
Example 5
The present invention first provides a protective agent, which comprises the following components by weight:
this example further provides a preparation method of the above protecting agent, which specifically comprises the following steps:
firstly, adding deionized water, OP-10 and methyl potassium silicate into a dispersion tank, starting a stirrer, stirring at the speed of 300 revolutions per minute for 5 minutes to prepare a dispersion 1 for later use; then adding water and PVA2488 into a dispersion tank, adjusting the rotating speed of a stirrer to 500 revolutions per minute, and stirring for 15 minutes to prepare a dispersion 2 for later use; then adding the dispersion 1 and the dispersion 2 into a dispersion tank, starting a stirrer, stirring at a speed of 250 revolutions per minute and stirring for 7 minutes; and (3) adjusting the rotation speed of the stirrer to 150 revolutions per minute, adding borax into the dispersion tank for stirring for 7 minutes, and then discharging through a 200-mesh screen to obtain the borax-containing water-based paint.
Example 6
The embodiment firstly provides a protective agent, and the formula comprises the following components in percentage by weight:
this example further provides a preparation method of the protective agent, which specifically includes:
firstly, adding deionized water, OP-10 and methyl potassium silicate into a dispersion tank, starting a stirrer, stirring at the speed of 300 revolutions per minute for 5 minutes to prepare a dispersion 1 for later use; then adding water and PVA2488 into a dispersion tank, adjusting the rotating speed of a stirrer to 500 revolutions per minute, and stirring for 15 minutes to prepare a dispersion 2 for later use; then adding the dispersion 1 and the dispersion 2 into a dispersion tank, starting a stirrer, stirring at a speed of 250 revolutions per minute and stirring for 7 minutes; and (3) adjusting the rotation speed of the stirrer to 150 revolutions per minute, adding borax into the dispersion tank for stirring for 7 minutes, and then discharging through a 200-mesh screen to obtain the borax-containing water-based paint.
Comparative example 1
The comparative example provides a protective agent, and the difference between the formula and the preparation method of the protective agent and the example 3 is only that the same amount of PVA2488 is replaced by EVE redispersible latex powder.
The same as in example 3.
Comparative example 2
This comparative example provides a protectant whose formulation differs from that of example 3 only by the equivalent replacement of potassium methyl silicate with borax.
The preparation method is the same as example 3.
Comparative example 3
This comparative example provides a protective agent whose formulation differs from that of example 3 only by an equal replacement of borax by potassium methylsilicate.
The preparation method is the same as example 3.
Experimental example 1
The protective agent of the embodiment of the invention and the existing like products are tested for the limit of harmful substances according to the method of GB 24408-2009 limit of harmful substances in exterior wall coating for buildings, and the results are shown in Table 1.
Table 1 amount of hazardous substance in each example
As can be seen from table 1, the content of volatile organic compounds in the protective agent provided by the present invention is far lower than the standard value specified in GB 24408-2009, and does not contain harmful substances such as benzene + toluene + ethylbenzene + xylene, free formaldehyde, and the like. Therefore, the protective agent provided by the invention has the characteristics of no toxicity, no harm, safety and environmental protection.
Experimental example 2
The protective agents prepared in the same type of products, various embodiments and comparative examples in the market are tested, and the test method and the results are as follows:
(1) The adhesion test method refers to GB/T1720-79 (89) paint film adhesion test method (circle drawing method), which is classified into 1-7 grades, the best grade 1, and the worst grade 7;
(2) The stain resistance, the artificial climate aging resistance and the alkali resistance are tested by referring to GB/T9755-2001 synthetic resin emulsion exterior wall coating, the smaller the color change value is, the better the stain resistance is;
(3) The water impermeability test method adopts a Caseton tube method, the water impermeability is obtained after 2 hours under the action of a water column, and the smaller the numerical value is, the better the water impermeability is;
(4) The water and vapor permeability test method is used for testing and calculating according to a method specified in GB/T17146-2015 test method for water vapor permeability of building materials and products thereof, wherein the larger the value is, the better the water vapor permeability is.
The test results are shown in Table 2.
Table 2 results of performance test of each example
As can be seen from Table 2, under the same test conditions, the protective agent product of the invention has better performance indexes such as adhesive force, stain resistance, artificial climate aging resistance, impermeability and water vapor permeability than similar products in the market.
According to the performance test results of the products of the embodiments of the invention, when the contents of the potassium methyl silicate and the PVA2488 are more, the stain resistance and the waterproofness are better, and the water vapor permeability is lower; when the borax content is high, the adhesive force, the water vapor permeability and the stain resistance are good.
Although the invention has been described in detail with respect to the general description and the specific embodiments thereof, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Accordingly, it is intended that all such modifications and alterations be included within the scope of this invention as defined in the appended claims.
Claims (7)
1. The protective agent is characterized by comprising the following components in parts by weight:
15-40 parts of first component
10-25 parts of a second component;
wherein the first component is prepared from (2-5) by weight: (1-3) the potassium methylsilicate and polyvinyl alcohol of PVA2488;
the second component is borax;
it also contains:
OP-10, wherein the weight ratio of the OP-10 to the methyl potassium silicate is (1-5): (10-25);
deionized water, wherein the weight ratio of the deionized water to OP-10 to potassium methylsilicate is (9-25): (1-5): (10-25);
and water, wherein the weight ratio of the water to the polyvinyl alcohol is (6-9): (1-3).
2. The protective agent according to claim 1, characterized in that it comprises the following components in parts by weight:
9-25 parts of deionized water
OP-10-5 parts
10-25 parts of potassium methyl silicate
30-45 parts of water
PVA 2488-15 parts
10-25 parts of borax.
3. A process for the preparation of a protective agent according to claim 1 or 2, characterized in that it comprises:
emulsifying potassium methyl silicate to obtain dispersion 1;
dissolving polyvinyl alcohol to obtain dispersion 2;
mixing said dispersion 1 with said dispersion 2 to obtain a mixed dispersion 3;
and (3) mixing borax with the mixed dispersoid 3 to obtain the pigment.
4. The process for producing a protecting agent according to claim 3,
the preparation of the dispersion 1 specifically comprises: emulsifying potassium methyl silicate, OP-10 and deionized water at 200 to 400r/min to obtain the dispersion 1;
and/or, the preparation of the dispersion 2 comprises in particular: mixing polyvinyl alcohol and water at 400-600 r/min to obtain the dispersion 2;
and/or mixing the dispersion 1 and the dispersion 2 at 200 to 300r/min;
and/or mixing borax with the mixed dispersion 3 at the speed of 100 to 200r/min.
5. The use of the protective agent according to claim 1 or 2 or the protective agent prepared by the method according to claim 3 or 4 on the surface of a concrete member.
6. The use of the protective agent of claim 1 or 2 or the protective agent prepared by the method of claim 3 or 4 for the surface of prefabricated wall panels for fabricated concrete buildings.
7. The method for detecting the performance of the protecting agent according to claim 1 or 2 or the protecting agent prepared by the method for preparing the protecting agent according to claim 3 or 4, wherein the method comprises testing the protecting agent by using at least one of the following methods:
(1) The adhesion of the protective agent is tested by referring to GB/T1720-79 (89) paint film adhesion determination method (circled method);
when the adhesive force is less than or equal to grade 1, judging that the adhesive force of the protective agent is qualified;
(2) At least one of the performances of the stain resistance, the artificial climate aging resistance and the alkali resistance of the protective agent is tested by referring to GB/T9755-2001 synthetic resin emulsion exterior wall coating;
when the test result of the stain resistance is less than or equal to 12 percent, judging that the stain resistance of the protective agent is qualified;
when the time length of no bubble, no peeling and no crack is more than or equal to 600h and the color change value is less than or equal to 1, judging that the artificial weather aging resistance of the protective agent is qualified;
when the abnormality does not occur for more than 48 hours in the alkali resistance test, judging that the alkali resistance of the protective agent is qualified;
(3) Testing the impermeability of the protective agent by adopting a Casston tube method;
when the water penetration depth after 2 hours under the action of the water column is less than or equal to 150cm, judging that the water impermeability of the protective agent is qualified;
(4) Testing the water and vapor permeability of the protective agent according to GB/T17146-2015 test method for the water vapor permeability of building materials and products thereof;
and when the test result is more than or equal to 700g/m & 24h, judging that the water and vapor permeability of the protective agent is qualified.
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| CN202210191508.9A CN114573369B (en) | 2022-02-28 | 2022-02-28 | Protective agent for concrete prefabricated part and preparation and performance detection method thereof |
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| CN109111195A (en) * | 2018-06-26 | 2019-01-01 | 江苏新亿源环保科技有限公司 | A kind of preparation method of negative ion type function artificial stone |
| CN111303718A (en) * | 2020-02-26 | 2020-06-19 | 北京建筑材料科学研究总院有限公司 | Surface protective agent for prefabricated wallboard of fabricated concrete building and preparation method of surface protective agent |
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