CN110669422A - Double-component exterior wall coating and preparation method thereof - Google Patents
Double-component exterior wall coating and preparation method thereof Download PDFInfo
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- CN110669422A CN110669422A CN201910880425.9A CN201910880425A CN110669422A CN 110669422 A CN110669422 A CN 110669422A CN 201910880425 A CN201910880425 A CN 201910880425A CN 110669422 A CN110669422 A CN 110669422A
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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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
- C09D133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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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
- C09D5/08—Anti-corrosive paints
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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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
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses a double-component exterior wall coating and a preparation method thereof, wherein the double-component exterior wall coating comprises a component A and a component B, wherein the component A comprises the following components: 10-15% of low-hydroxyl acrylic acid dispersoid, 15-20% of modified polyurethane dispersoid, 0.2-0.3% of pH regulator, 0.8-1% of first environment-friendly solvent, 1.5-1.8% of dispersant, 0.1-0.2% of anti-settling agent, 0.8-1% of wetting and leveling agent, 0.4-0.6% of thickening agent, 0.6-0.7% of defoaming agent, 2-20% of titanium dioxide, 30-45% of heavy calcium and 15-18% of deionized water; the component B comprises: 85-90% of water-based isocyanate curing agent and 10-15% of second environment-friendly solvent. The double-component exterior wall coating provided by the invention has the advantages of high hardness, good aging resistance, strong hydrophobicity, excellent acid and alkali resistance, no bubbling and miliaria when being coated thickly, and has wide market prospect.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a double-component exterior wall coating and a preparation method thereof.
Background
In recent years, with the improvement of the living standard of people and the continuous development of society, people pay more and more attention to the selection of architectural decorative coatings, the simpler the construction requirement on the coatings is, the better the coating is, the coatings especially applied to the external wall coating not only can be stopped on the most basic protection on substrates, but also put forward higher requirements on the decorative effect of the coatings. The exterior wall coating is required to have excellent water resistance and stain resistance, and the paint film is required to be dried quickly, not only does not generate miliaria when being thick coated, but also is hard and flat after being dried.
The water-based acrylic coating has the advantages of moderate cost, excellent weather resistance, good adjustability, no organic solvent release and the like, and is a coating product which is developed rapidly in recent years. However, the acrylic coating put into the domestic market at present has the defects of difficult thick coating, easy miliaria, low drying speed at room temperature, poor elasticity and abrasion resistance of a paint film and the like, so that the coating is easy to crack and peel, corrosive substances such as rainwater and the like are easy to permeate into the wall surface and corrode the wall body, the decoration beauty of the building is influenced, and the service life of the building is also shortened. Therefore, how to develop the water-based exterior wall coating with excellent performance is a technical problem which is difficult to solve in the field of water-based paint.
Disclosure of Invention
Aiming at the problems that the water-based exterior wall coating in the prior art is not easy to be thickly coated, the drying speed at room temperature is low, and the elasticity and the wear resistance of a paint film are poor, the invention provides the two-component exterior wall coating and the preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the double-component exterior wall coating comprises a component A and a component B, wherein the component A comprises the following raw material components in percentage by mass: 10-15% of low-hydroxyl acrylic acid dispersoid, 15-20% of modified polyurethane dispersoid, 0.2-0.3% of pH regulator, 0.8-1% of first environment-friendly solvent, 1.5-1.8% of dispersant, 0.1-0.2% of anti-settling agent, 0.8-1% of wetting and leveling agent, 0.4-0.6% of thickening agent, 0.6-0.7% of defoaming agent, 2-20% of titanium dioxide, 30-45% of heavy calcium and 15-18% of deionized water;
the component B comprises the following raw material components in percentage by mass: 85-90% of water-based isocyanate curing agent and 10-15% of second environment-friendly solvent;
the mass ratio of the component A to the component B is 18-22: 1.
Compared with the prior art, the double-component exterior wall coating provided by the invention has the advantages that the low-hydroxyl acrylic acid dispersoid and the modified polyurethane dispersoid are selected to be mixed and spliced as the film-forming resin, so that the using amount of the curing agent can be effectively reduced, and the defects of low crosslinking density of a paint film, low drying speed and low hardness of the dried paint film caused by reducing the using amount of the curing agent can be overcome; the paint is assisted by other assistants and fillers with good water resistance and solvent resistance, so that the prepared paint film has high hardness, good aging resistance, strong hydrophobicity, excellent self-cleaning effect and excellent rain erosion resistance, is excellent in acid and alkali resistance, does not foam and generate miliaria when being thickly coated, can form a flat and smooth paint film after being dried, and is particularly suitable for being used as an external wall paint of high-grade buildings.
Preferably, the low-hydroxyl acrylic dispersion is a polyurethane modified aromatic polyether hydroxyl acrylic dispersion, the solid content is 45.5-47.5%, and the hydroxyl content is 2-3%.
More preferably, the low hydroxyl acrylic dispersion is XK110 of DSM.
The preferable low-hydroxyl acrylic acid dispersoid is a primary dispersoid containing hydroxyl and a styrene-acrylic structure, the hydroxyl content is 2-3%, the lower hydroxyl content and the unique styrene-acrylic structure can not only reduce the using amount of a curing agent, but also improve the aging resistance and the corrosion resistance of the coating.
Preferably, the modified polyurethane dispersion is an acrylic modified aromatic polyether polyurethane dispersion and a polyester modified aliphatic polyurethane based dispersion in a mass ratio of 2-4: 1.
More preferably, the modified polyurethane dispersion comprises Lacper 4221 and ACURE2115 in a mass ratio of 2-4: 1.
The Lacper 4221 and the ACURE2115 are compounded according to a specific proportion, so that the drying speed and the hardness of the coating can be improved, and the water resistance and the weather resistance of the coating can be obviously improved.
By blending the modified polyurethane dispersion and the low-hydroxyl acrylic dispersion compounded according to the specific proportion, the coating still has higher aging resistance and corrosion resistance on the premise of reducing the using amount of the curing agent, the reduction of crosslinking density caused by reducing the using amount of the curing agent is avoided, the reduction of the corrosion resistance and the aging resistance of the coating is further avoided, and the reduction of drying speed caused by reducing the using amount of the curing agent is avoided; the three resins are mixed, so that the coating is endowed with excellent quick-drying property and early water resistance, the outdoor construction is convenient, meanwhile, the three resins are mixed, the wrapping property of the film-forming resin on pigments and fillers can be improved, and the structural requirement of the external wall coating on high pigment-base ratio can be completely met, therefore, the coating provided by the invention is particularly suitable for preparing the external wall coating.
Preferably, the first environmentally friendly solvent is an alcohol ester twelve.
The optimized solvent has small volatilization amount, no toxicity and low odor, and has higher boiling point, and the lower dosage can effectively improve the leveling and adjust the drying speed of a paint film.
Preferably, the dispersing agent is an organosilicon gemini surfactant and a polyacrylate dispersing agent in a mass ratio of 1-3: 1.
More preferably, the dispersant is BYK-194 and OMG's Borchi Gen 1252 in a mass ratio of 1-3: 1.
The preferable two dispersants are compounded, so that the pigment dispersing agent has an excellent dispersing effect, can effectively enhance the dispersibility of components in the coating, prevents the pigment filler from flocculating, enables the components in the coating to be uniformly dispersed in a system, and is particularly suitable for being used as a dispersant of an external wall coating with a high pigment ratio.
Preferably, the anti-settling agent is BENTONE DE of hamming.
The preferable bentonite is used as a binder, so that the paint film has better air-blocking property, elasticity and adhesive force, and the water resistance of the paint film is further improved.
Preferably, the wetting and leveling agent is a silane/siloxane mixed emulsion.
More preferably, the wetting and leveling agent is BS4004 of Wacker.
The preferable wetting and leveling agent has excellent substrate wettability and excellent flow promotion performance, is beneficial to the construction of the coating on the rough outer wall surface, and improves the adhesive force of the coating on the outer wall, and the preferable wetting agent also has high compatibility and hydrophobicity, and can effectively improve the dispersibility of each component in a coating system and the hydrophobicity of the coating by cooperating with the preferable dispersing agent in the invention, thereby leading the coating to have excellent self-cleaning performance.
Preferably, the thickening agent is a strong pseudoplastic polyurethane thickening agent and a water-based acrylic acid copolymer emulsion with the mass ratio of 0.8-1.2: 1.
More preferably, the thickener is a mixture of Borchi Gel 0620 and BASFViscalex HV30 in a mass ratio of 0.8-1.2: 1.
The preferred thickeners are effective in improving the storage stability and sag resistance of the coating and in improving the workability of the coating. And the preferable dispersing agent, wetting agent and thickening agent of the invention cooperate to effectively improve the stability of the coating system, improve the storage stability and reduce the pigment and filler sedimentation.
Preferably, the defoamer is a polyether siloxane copolymer.
More preferably, the defoaming agent is a mixture of Tego-901W and Tego-810 in a mass ratio of 1: 0.8-1.2.
The two preferable antifoaming agents are mixed for use, so that a lasting defoaming and foam inhibiting effect can be obtained, the storage stability and the application property of the component A are ensured, no side effect is caused on the appearance and the uniformity of a paint film, and the phenomenon that fish eyes, craters and the like influence the appearance of the paint film is avoided.
Preferably, the aqueous isocyanate ester curing agent is trimethylolpropane-modified toluene diisocyanate trimer.
More preferably, the aqueous isocyanate ester curing agent is HT-600 of Van Waals chemistry.
The preferred isocyanate curing agent is an excellent trifunctional isocyanate curing agent, has good compatibility with a system, is easy to stir, and enables the prepared coating to have good gloss and compactness by adding the isocyanate curing agent.
The low-hydroxyl acrylic resin and the modified polyurethane dispersoid are crosslinked and cured with trimethylolpropane modified toluene diisocyanate tripolymer, and the preferable environment-friendly solvent is cooperated, so that the advantages of high drying speed and high upper hardness of a paint film, and high hardness and excellent initial water resistance in the initial crosslinking stage can be provided.
Preferably, the second environmentally friendly solvent is dipropylene glycol methyl ether acetate.
The preferable second environment-friendly solvent can fully dissolve the isocyanate curing agent, is beneficial to fully mixing the dissolved isocyanate curing agent with the component A, and improves the crosslinking speed, thereby shortening the drying time.
Preferably, the titanium dioxide is rutile type titanium dioxide, such as python LR-996.
The invention also provides a preparation method of the double-component exterior wall coating, which at least comprises the following steps:
step a, weighing the components according to the design proportion of the two-component exterior wall coating, uniformly stirring the weighed pH regulator, the first environment-friendly solvent, the dispersant, the defoamer, the anti-settling agent and the deionized water, adding titanium dioxide and coarse whiting, uniformly mixing, and grinding to obtain a first mixed material with the fineness of less than or equal to 40 mu m;
b, adding the weighed low-hydroxyl acrylic acid dispersoid and the weighed modified polyurethane dispersoid into the first mixed material, uniformly stirring, adding a wetting leveling agent and a thickening agent, and adjusting the stormer viscosity to 25 ℃ to 95-100KU to obtain a component A;
step c, uniformly mixing the weighed water-based isocyanate curing agent and the second environment-friendly solvent to obtain a component B;
and d, mixing the A, B components according to the designed proportion to obtain the two-component exterior wall coating.
The preparation method is simple to operate, free of complex procedures, free of special equipment and low in cost, is suitable for industrial large-scale production, and the prepared double-component exterior wall coating is high in hardness, good in aging resistance, strong in hydrophobicity, excellent in acid and alkali resistance, free of bubbling and miliaria when thick coated, capable of forming a flat and smooth paint film after being dried, particularly suitable for serving as exterior wall coating of high-grade buildings, and wide in market prospect.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment of the invention provides a two-component exterior wall coating, which comprises a component A and a component B, wherein the component A comprises the following raw material components in percentage by mass: 10% of low-hydroxyl acrylic acid dispersoid, 20% of modified polyurethane dispersoid, 0.2% of pH regulator, 0.8% of first environment-friendly solvent, 1.8% of dispersant, 0.2% of anti-settling agent, 0.8% of wetting and leveling agent, 0.6% of thickener, 0.6% of defoamer, 20% of titanium dioxide, 30% of heavy calcium and 15% of deionized water;
the component B comprises the following raw material components in percentage by mass: 85% of water-based isocyanate curing agent and 15% of second environment-friendly solvent;
the mass ratio of the component A to the component B is 20: 1.
Wherein the low hydroxyl acrylic dispersion is XK110 of DSM; the modified polyurethane dispersoid comprises Lacper 4221 and ACURE2115 in a mass ratio of 2: 1; the pH regulator is N, N-dimethylethanolamine; the first environment-friendly solvent is alcohol ester twelve; the dispersant is BYK-194 and Borchi Gen 1252 of OMG in a mass ratio of 1: 1; the anti-settling agent is Bentonie DE of Haimines; the wetting and leveling agent is BS4004 of Wacker; the thickening agent is a mixture of Borchi Gel 0620 and BASF Viscalex HV30 in a mass ratio of 0.8: 1; the defoaming agent is a mixture of Tego-901W and Tego-810 in a mass ratio of 1: 1; the water-based isocyanate curing agent is HT-600 in Wanhua chemistry; the second environment-friendly solvent is dipropylene glycol methyl ether acetate.
The preparation steps of the two-component exterior wall coating are as follows:
step a, weighing the components according to the design proportion of the two-component exterior wall coating, uniformly stirring the weighed pH regulator, the first environment-friendly solvent, the dispersant, the defoamer, the anti-settling agent and the deionized water, adding titanium dioxide and coarse whiting, uniformly mixing, and grinding to obtain a first mixed material with the fineness of less than or equal to 40 mu m;
b, adding the weighed low-hydroxyl acrylic acid dispersoid and the weighed modified polyurethane dispersoid into the first mixed material, uniformly stirring, adding a wetting leveling agent and a thickening agent, and adjusting the stormer viscosity to 25 ℃ to 95-100KU to obtain a component A;
step c, uniformly mixing the weighed water-based isocyanate curing agent and the second environment-friendly solvent to obtain a component B;
and d, mixing the A, B components according to the designed proportion to obtain the two-component exterior wall coating.
Example 2
The embodiment of the invention provides a two-component exterior wall coating, which comprises a component A and a component B, wherein the component A comprises the following raw material components in percentage by mass: 12% of low-hydroxyl acrylic acid dispersoid, 18% of modified polyurethane dispersoid, 0.2% of pH regulator, 0.9% of first environment-friendly solvent, 1.7% of dispersant, 0.15% of anti-settling agent, 0.9% of wetting and leveling agent, 0.5% of thickener, 0.65% of defoamer, 14% of titanium dioxide, 35% of heavy calcium and 16% of deionized water;
the component B comprises the following raw material components in percentage by mass: 90% of water-based isocyanate curing agent and 10% of second environment-friendly solvent;
the mass ratio of the component A to the component B is 22: 1.
The above-mentioned components are given the same designations as in example 1, except that: the modified polyurethane dispersoid comprises Lacper 4221 and ACURE2115 in a mass ratio of 4: 1; the dispersing agent is BYK-194 and BorchiGen 1252 of OMG in a mass ratio of 2: 1; the thickening agent is a mixture of Borchi Gel 0620 and BASF Viscalex HV30 in a mass ratio of 1: 1; the defoaming agent is a mixture of Tego-901W and Tego-810 in a mass ratio of 1: 1.2.
The preparation steps of the two-component exterior wall coating are the same as those of the embodiment 1, and the description is omitted here.
Example 3
The embodiment of the invention provides a two-component exterior wall coating, which comprises a component A and a component B, wherein the component A comprises the following raw material components in percentage by mass: 15% of low-hydroxyl acrylic acid dispersoid, 15% of modified polyurethane dispersoid, 0.3% of pH regulator, 1% of first environment-friendly solvent, 1.5% of dispersant, 0.1% of anti-settling agent, 1% of wetting and leveling agent, 0.4% of thickener, 0.7% of defoaming agent, 2% of titanium dioxide, 45% of heavy calcium and 18% of deionized water;
the component B comprises the following raw material components in percentage by mass: 87% of water-based isocyanate curing agent and 13% of second environment-friendly solvent;
the mass ratio of the component A to the component B is 18: 1.
The above-mentioned components are given the same designations as in example 1, except that: the modified polyurethane dispersoid comprises Lacper 4221 and ACURE2115 in a mass ratio of 3: 1; the dispersing agent is BYK-194 and BorchiGen 1252 of OMG in a mass ratio of 3: 1; the thickening agent is a mixture of Borchi Gel 0620 and BASF Viscalex HV30 in a mass ratio of 1.2: 1; the defoaming agent is a mixture of Tego-901W and Tego-810 in a mass ratio of 1: 0.8.
The preparation steps of the two-component exterior wall coating are the same as those of the embodiment 1, and the description is omitted here.
Example 4
The embodiment of the invention provides a two-component exterior wall coating, which has the same raw material composition and preparation method as those of embodiment 1, and is different from that of embodiment 1 in that a low-hydroxyl acrylic acid dispersion XK110 is replaced by Wanhua chemical A2033.
Example 5
The embodiment of the invention provides a two-component exterior wall coating, which has the same raw material composition and preparation method as those of embodiment 1, except that a thickening agent is replaced by Borchi Gel 0620 and Haimines DeuRheo WT-105A in a mass ratio of 0.8:1, and a wetting and leveling agent is replaced by TEGO-4100 in a mass ratio of digao; the isocyanate curing agent HT-600 was replaced with Bayhydur 401-70.
The exterior wall coatings in the above examples were subjected to performance tests, and the results are shown in table 1.
TABLE 1
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The double-component exterior wall coating comprises a component A and a component B, and is characterized in that the component A comprises the following raw material components in percentage by mass: 10-15% of low-hydroxyl acrylic acid dispersoid, 15-20% of modified polyurethane dispersoid, 0.2-0.3% of pH regulator, 0.8-1% of first environment-friendly solvent, 1.5-1.8% of dispersant, 0.1-0.2% of anti-settling agent, 0.8-1% of wetting and leveling agent, 0.4-0.6% of thickening agent, 0.6-0.7% of defoaming agent, 2-20% of titanium dioxide, 30-45% of heavy calcium and 15-18% of deionized water;
the component B comprises the following raw material components in percentage by mass: 85-90% of water-based isocyanate curing agent and 10-15% of second environment-friendly solvent;
the mass ratio of the component A to the component B is 18-22: 1.
2. The two-component exterior wall coating of claim 1, wherein the low hydroxyl acrylic dispersion is a polyurethane-modified aromatic polyether hydroxyl acrylic dispersion having a solid content of 45.5-47.5% and a hydroxyl content of 2-3%; and/or
The modified polyurethane dispersion is acrylic modified aromatic polyether polyurethane dispersion and polyester modified aliphatic polyurethane dispersion in a mass ratio of 2-4: 1.
3. The two-component exterior wall coating of claim 2 wherein the low hydroxyl acrylic dispersion is DSM XK 110; and/or
The modified polyurethane dispersion comprises Lacper 4221 and ACURE2115 in a mass ratio of 2-4: 1.
4. The two-component exterior wall coating of claim 1, wherein the first environmentally friendly solvent is an alcohol ester twelve; and/or
The dispersing agent is an organic silicon gemini surfactant and a polyacrylate dispersing agent in a mass ratio of 1-3: 1; and/or
The wetting and leveling agent is silane/siloxane mixed emulsion.
5. The two-component exterior wall coating of claim 4, wherein the dispersant is BYK-194 and OMG Borchi Gen 1252 in a mass ratio of 1-3: 1; and/or
The wetting and leveling agent is BS4004 of Wacker.
6. The two-component exterior wall coating of claim 1, wherein the thickener is a strong pseudoplastic polyurethane thickener and an aqueous acrylic acid copolymer emulsion in a mass ratio of 0.8-1.2: 1; and/or
The defoaming agent is polyether siloxane copolymer.
7. The two-component exterior wall coating of claim 6, wherein the thickener is a mixture of Borchi Gel 0620 and BASF Viscalex HV30 in a mass ratio of 0.8-1.2: 1; and/or
The defoaming agent is a mixture of Tego-901W and Tego-810 in a mass ratio of 1: 0.8-1.2.
8. The two-component exterior wall coating of claim 1, wherein the aqueous isocyanate curing agent is trimethylolpropane-modified toluene diisocyanate trimer; and/or
The second environment-friendly solvent is dipropylene glycol methyl ether acetate.
9. The two-component exterior wall coating of claim 8, wherein the aqueous isocyanate curing agent is HT-600 of wanhua chemistry.
10. A preparation method of a two-component exterior wall coating is characterized by at least comprising the following steps:
step a, weighing the components according to the design proportion of the two-component exterior wall coating of any one of claims 1 to 9, uniformly stirring the weighed pH regulator, the first environment-friendly solvent, the dispersing agent, the defoaming agent, the anti-settling agent and the deionized water, adding titanium dioxide and coarse whiting, uniformly mixing, and grinding to obtain a first mixed material with the fineness of less than or equal to 40 microns;
b, adding the weighed low-hydroxyl acrylic acid dispersoid and the weighed modified polyurethane dispersoid into the first mixed material, uniformly stirring, adding a wetting leveling agent and a thickening agent, and adjusting the stormer viscosity to 25 ℃ to 95-100KU to obtain a component A;
step c, uniformly mixing the weighed water-based isocyanate curing agent and the second environment-friendly solvent to obtain a component B;
and d, mixing the A, B components according to the designed proportion to obtain the two-component exterior wall coating.
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| CN114196307A (en) * | 2021-12-16 | 2022-03-18 | 福建省三棵树新材料有限公司 | High-hardness high-fullness low-curing-agent aqueous double-component woodware clear top coat and preparation method thereof |
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2019
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| CN114539895A (en) * | 2021-10-29 | 2022-05-27 | 惠州飞凯新材料有限公司 | Water-based PU (polyurethane) coating and coating process |
| CN114015346A (en) * | 2021-11-05 | 2022-02-08 | 浙江卡尔森汽车有限公司 | Water-based paint for refitted vehicle and preparation method thereof |
| CN114196307A (en) * | 2021-12-16 | 2022-03-18 | 福建省三棵树新材料有限公司 | High-hardness high-fullness low-curing-agent aqueous double-component woodware clear top coat and preparation method thereof |
| CN115558390A (en) * | 2022-07-22 | 2023-01-03 | 奔腾漆业(上海)有限公司 | Thick-coating polyurethane finish paint material and preparation method thereof |
| CN115558390B (en) * | 2022-07-22 | 2024-01-12 | 奔腾漆业(上海)有限公司 | Thick-coating polyurethane finish paint material and preparation method thereof |
| CN116285526A (en) * | 2023-02-07 | 2023-06-23 | 福建省三棵树新材料有限公司 | High-adhesion double-component white primer for magnesium oxide and preparation method thereof |
| CN116535958A (en) * | 2023-05-29 | 2023-08-04 | 龙牌涂料(北京)有限公司 | Quick-drying type double-component polyurethane water-based paint and preparation method thereof |
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