CN112048237A - Water-based double-component matte clear finish paint and preparation method thereof - Google Patents
Water-based double-component matte clear finish paint and preparation method thereof Download PDFInfo
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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
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/47—Levelling agents
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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
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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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
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- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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- 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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
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Abstract
The application relates to the technical field of water-based coatings, and particularly discloses a water-based double-component matte clear finish and a preparation method thereof. The water-based bi-component matte clear finish paint is prepared from a main paint, a curing agent and purified water according to a weight ratio of 100:15:12, wherein the main paint comprises the following components in parts by weight: aqueous polyurethane dispersion: 30-60 parts; aqueous hydroxy polyacrylic acid dispersion: 15-45 parts; wetting agent: 0.1-1 part; organic silicon flatting agent: 0.05-1 part; dispersing agent: 0.05-1 part; matting powder: 1-2 parts; film-forming auxiliary agent: 4-10 parts; defoaming agent: 0.1-1 part; anti-settling agent: 0.02-1 part; aqueous hand feeling wax emulsion: 2-10 parts; rheological aid: 0.2-1 part; mildew preventive: 0.05-1 part; purified water: 0-10 parts. The water-based bi-component matte top-coat paint prepared by the method has the advantages of being simple to operate and suitable for large-scale production.
Description
Technical Field
The application relates to the technical field of water-based coatings, in particular to a water-based bi-component matte clear finish paint capable of being constructed on oil PU primer, UV primer, water-based primer, melamine board, PVC and other substrates and a preparation method thereof.
Background
In recent years, with the increasing awareness of environmental protection and health, the restrictions of environmental regulations of various countries on VOC are becoming more and more severe. The green and environment-friendly water-based paint is replacing the oil paint with high pollution, and the development of the paint is becoming an important direction.
Reviewing time tracks and geographical positions of development of the water-based paint, people can find that the southern area is relatively mature, customers are more stable, and compared with the characteristics of the water-based paint in the province, the excellent and suitable humidity environment of the southern area is more beneficial to construction of the water-based paint, the water-based paint is easy to have the problems of orange peel, miliaria, poor leveling property, poor stability and the like when being constructed in the northern high-temperature low-humidity environment, and the service environment tolerance is relatively low. Through the comparison of products of various manufacturers in the coating industry, no water-based coating which can be universally used in the south and the north and is not influenced by seasons exists.
Therefore, a new solution is needed to solve the above problems.
Disclosure of Invention
Aiming at the problems of poor construction performance and poor paint film performance of the clear finish in the traditional technology under the high-temperature low-humidity environment, the application aims to provide the water-based bi-component matte clear finish which has the advantages of easiness in construction under the high-temperature low-humidity environment, good leveling property of a wet film, quick surface drying, no orange peel phenomenon, high transparency, high hardness and good water resistance.
The second purpose of the application is to provide a preparation method of the water-based bi-component matte top-coat paint, which has the advantages of simple operation and suitability for large-scale production.
In order to achieve the first purpose, the application provides the following technical scheme:
the water-based double-component matte clear finish paint is prepared from a main paint, a curing agent and purified water according to a weight ratio of 100:15:12, wherein the main paint comprises the following components in parts by weight:
aqueous polyurethane dispersion: 30-60 parts;
aqueous hydroxy polyacrylic acid dispersion: 15-45 parts;
wetting agent: 0.1-1 part;
organic silicon flatting agent: 0.05-1 part;
dispersing agent: 0.05-1 part;
matting powder: 1-2 parts;
film-forming auxiliary agent: 4-10 parts;
defoaming agent: 0.1-1 part;
anti-settling agent: 0.02-1 part;
aqueous hand feeling wax emulsion: 2-10 parts;
rheological aid: 0.2-1 part;
mildew preventive: 0.05-1 part;
purified water: 0-10 parts.
By adopting the technical scheme, the water-based hydroxyl polyacrylic acid dispersoid is subjected to deep crosslinking reaction with hydrophilic aliphatic polyisocyanate, namely-OH in a resin component and-NCO in a curing agent component react to generate urethane bonds, so that a compact film coating effect is obtained, and meanwhile, the hardness and the water resistance of a paint film are improved; in addition, the polyurethane dispersion which is better in compatibility with acrylic resin and good in transparency is adopted, so that the surface effect of a paint film can be improved, the phenomena of pinholes and miliaria which are easy to appear in the paint film are eliminated, and meanwhile, the fullness of the paint film is improved.
The clear finish paint obtained by the method has the advantages of easiness in construction in a high-temperature low-humidity environment, good leveling property of a wet film, quickness in surface drying, no orange peel phenomenon, high transparency, high hardness and good water resistance.
Further preferably, the main paint comprises the following components in parts by weight:
aqueous polyurethane dispersion: 52 parts of (1);
aqueous hydroxy polyacrylic acid dispersion: 25 parts of (1);
wetting agent: 0.5 part;
organic silicon flatting agent: 0.3 part;
dispersing agent: 0.2 part;
matting powder: 1.5 parts;
film-forming auxiliary agent: 5 parts of a mixture;
defoaming agent: 0.8 part;
anti-settling agent: 0.3 part;
aqueous hand feeling wax emulsion: 5 parts of a mixture;
rheological aid: 0.5 part;
mildew preventive: 0.2 part;
purified water: 9.7 parts.
By adopting the technical scheme, the bi-component matte top-coat paint prepared by the method has good application property and paint film performance, and through the combination of the components in the specific proportion, the obtained paint film has more excellent properties such as transparency, hardness and water resistance, and the construction latitude of a wet film is better.
More preferably, the wetting agent is an anionic fluorosurfactant, and the organosilicon leveling agent is an organosilicon gemini surfactant.
Through adopting above-mentioned technical scheme, the surface activity of wetting agent and flatting agent that this application adopted is stronger, and it is strong to reduce surface tension ability, adopts the wetting flatting agent of two kinds of different grade types to match the use, and the leveling nature of the coating that obtains in high temperature low humidity environment is better.
More preferably, the dispersing agent is TEGO-755W dispersing agent, and the matting powder is Grace SY7000 matting powder.
By adopting the technical scheme, the TEGO-755W dispersant has the advantages of reducing the consistency, dispersing faster and stabilizing the pigment, and has less influence on the water resistance; the Grace SY7000 extinction powder has the advantages of good high shear stability, grinding resistance, anti-settling property, good water resistance and transparency, good smearing hand feeling and easy dispersion.
More preferably, the defoaming agent is a composition of two or more selected from TEGO901W, TEGO902W, BYK-022 and AFCONA-2507.
By adopting the technical scheme, the top-coat paint is quick to construct, and can be sprayed on the back surface after the single surface is manually sprayed, so that the surface is quick to dry, the requirement on defoaming capability is high, the defoaming capability is high by adopting the combination of the different types of defoaming agents, and the obtained paint film is smooth.
More preferably, the film forming aid is a combination of two or more selected from the group consisting of alcohol ester-12, dipropylene glycol butyl ether, and N-methylpyrrolidone.
By adopting the technical scheme, the film forming additive has good film forming property, moderate volatilization rate and good use effect.
More preferably, the curing agent is a hydrophilic aliphatic polyisocyanate.
By adopting the technical scheme, the HDI-based aliphatic polyisocyanate is adopted as the curing agent in the application, has hydrophilicity, is easy to emulsify in a water phase, and has good crosslinking effect when being used as polyurethane bi-component clear finish.
In order to achieve the second purpose, the application provides the following technical scheme:
a preparation method of a water-based bi-component matte clear finish paint is obtained by the following preparation steps:
s1, adding the aqueous polyurethane dispersion and the aqueous hydroxyl polyacrylic acid dispersion into a stirring kettle, and stirring for 5-10min at 400-600 rpm;
s2, adding a mixture prepared by a wetting agent, a dispersing agent, a film-forming aid and a defoaming agent into a stirring kettle, and dispersing at a high speed of 1000-1200rpm for 30 min;
s3, sequentially adding an anti-settling agent and matting powder into the stirring kettle, and dispersing at high speed of 1000rpm for 20min at 900 plus materials, wherein the fineness is controlled to be less than 25 mu m;
s4, sequentially adding the water-based hand feeling wax emulsion, the organic silicon leveling agent, the rheological aid, the mildew preventive and the purified water into the stirring kettle, and dispersing for 10min at 800rpm under 600-;
s5, mixing the main paint, the curing agent and the purified water according to the weight ratio of 100:15:12, and uniformly stirring to obtain the water-based double-component matte clear finish paint.
In summary, compared with the prior art, the application has the following beneficial effects:
(1) according to the preparation method, the water-based hydroxyl polyacrylic acid dispersoid is subjected to deep crosslinking reaction with hydrophilic aliphatic polyisocyanate, namely-OH in a resin component and-NCO in a curing agent component react to generate urethane bonds, so that a compact film coating effect is obtained, and meanwhile, the hardness and the water resistance of a paint film are improved; the polyurethane dispersion is added, so that the surface effect of a paint film is improved, the phenomena of pinholes and miliaria which are easy to appear in the paint film are eliminated, and meanwhile, the fullness of the paint film is improved;
(2) the clear finish paint obtained by the method has the advantages of easiness in construction in a high-temperature low-humidity environment, good leveling property of a wet film, quickness in surface drying, no orange peel phenomenon, high transparency, high hardness and good water resistance.
Drawings
FIG. 1 is a flow chart of a process for preparing an aqueous two-component matte top-coat paint in example 1 of the present application.
Detailed Description
The present application will be described in detail below with reference to the drawings and examples.
In the application, the cationic fluorine surfactant is FC-911; the organic silicon gemini structure surfactant adopts Digao TEGO 4100; the hydrophilic aliphatic polyisocyanate adopts Bayer HDI XP 2655; the aqueous polyurethane dispersion adopts Wanhua 4219; the aqueous hydroxyl polypropylene dispersion adopts Bayer A2770; the anti-settling agent is purchased from Aofen chemical Co., Ltd, Shanghai, under the brand number of 312; the rheological additive adopts BYK-333; the mildew inhibitor adopts KP-M02.
In addition, other raw materials used in the present application are all commonly commercially available.
Example 1: the water-based bi-component matte top-coat paint is prepared from a main paint, a curing agent and purified water according to a weight ratio of 100:15:12, wherein the curing agent is hydrophilic aliphatic polyisocyanate, and the components and the corresponding weight parts in the main paint are shown in table 1. Referring to fig. 1, the bi-component matte clear finish is prepared by the following steps:
s1, adding the aqueous polyurethane dispersion and the aqueous hydroxyl polyacrylic acid dispersion into a stirring kettle, and stirring at 400rpm for 10 min;
s2, adding a mixture prepared by a wetting agent, a dispersing agent, a film-forming aid and a defoaming agent into a stirring kettle, and dispersing at a high speed of 1000rpm for 30 min;
s3, sequentially adding an anti-settling agent and matting powder into the stirring kettle, dispersing at high speed of 900rpm for 20min, and controlling the fineness to be 20 μm;
s4, sequentially adding the water-based hand feeling wax emulsion, the organic silicon leveling agent, the rheological aid, the mildew preventive and the purified water into the stirring kettle, and dispersing at 600rpm for 10min to obtain the main paint;
s5, mixing the main paint, the curing agent and the purified water according to the weight ratio of 100:15:12, and uniformly stirring to obtain the water-based double-component matte clear finish paint.
In this embodiment, the wetting agent is an anionic fluorosurfactant, and the organosilicon leveling agent is an organosilicon gemini surfactant.
The dispersing agent adopts TEGO-755W dispersing agent, and the matting powder adopts Grace SY7000 matting powder.
The defoamer was a mixture of TEGO901W and TEGO902W in a 1:1 weight ratio.
The film-forming aid adopts a mixture of alcohol ester-12 and dipropylene glycol butyl ether in a weight ratio of 1: 1.
Examples 2 to 6: the difference between the water-based double-component matte clear finish paint and the example 1 is that the components and the corresponding parts by weight are shown in the table 1.
TABLE 1 Components and parts by weight of examples 1-6
Example 7: a water-based double-component matte top-coat paint is different from the paint in the embodiment 1 in that a defoaming agent is a mixture of TEGO902W, BYK-022 and AFCONA-2507 in a weight ratio of 2:1: 1; the film-forming assistant is a mixture of alcohol ester-12, dipropylene glycol butyl ether and N-methyl pyrrolidone in a weight ratio of 1:1: 3.
Comparative example 1: the difference from example 1 is that a general commercial matte top-coat paint was used as comparative example 1.
Comparative example 2: the difference from example 1 is that a general commercial matte top-coat paint was used as comparative example 2.
Comparative example 3: the difference from example 1 is that no aqueous polyurethane dispersion is added.
Performance testing
The performance tests obtained in examples 1 to 7 and comparative examples 1 to 3 were conducted, and the test results are shown in the following Table 2.
The test method comprises the following steps:
1. selecting environment in clean environment with humidity of 10-25% and temperature of 30-45 deg.C;
2. selecting a UV transparent primer plate as the primer plate, polishing, flattening, spraying a color modifier, and drying for later use;
3. the spray gun adopts a plunger pump type manual spraying mode;
4. mixing the main paint, the curing agent and water according to the proportion of 100:15:12, uniformly stirring, filtering, and spraying four cups of paint for 100 s;
5. spraying two crosses on the prepared UV primer plate, controlling the coating amount to be 120-150g/m2, normally placing one plate after spraying to observe the leveling effect, and leveling the paint film after surface drying; the other piece is turned over and placed immediately after being sprayed, and after the surface is dried, the flatness of a paint film is observed, and whether orange peel exists or not is judged;
after 6.3 days, the hardness, transparency and water resistance were measured for 72 hours.
Wherein the performance rating "0 → 5" indicates "poor → excellent".
As can be seen from the test data in Table 2, the matte top coats of examples 1-7 had high transparency, hardness of 2H, and no abnormality in water resistance for 72H, and comparative examples 1-2 were all commercial top coats having slightly inferior transparency, hardness, and water resistance to those of examples 1-7, and the test result of comparative example 3 was the worst. The matte top-coat paint prepared by the method has the advantages of high transparency, high hardness and good water resistance.
Table 2 results of performance testing
The above description is only a preferred embodiment of the present application, and the protection scope of the present application is not limited to the above embodiments, and all technical solutions belonging to the idea of the present application belong to the protection scope of the present application. It should be noted that several improvements and modifications to the present application without departing from the principles of the present application will occur to those skilled in the art, and such improvements and modifications should also be considered within the scope of the present application.
Claims (8)
1. The water-based double-component matte clear finish paint is characterized by comprising a main paint, a curing agent and purified water according to the weight ratio of 100:15:12, wherein the main paint comprises the following components in parts by weight:
aqueous polyurethane dispersion: 30-60 parts;
aqueous hydroxy polyacrylic acid dispersion: 15-45 parts;
wetting agent: 0.1-1 part;
organic silicon flatting agent: 0.05-1 part;
dispersing agent: 0.05-1 part;
matting powder: 1-2 parts;
film-forming auxiliary agent: 4-10 parts;
defoaming agent: 0.1-1 part;
anti-settling agent: 0.02-1 part;
aqueous hand feeling wax emulsion: 2-10 parts;
rheological aid: 0.2-1 part;
mildew preventive: 0.05-1 part;
purified water: 0-10 parts.
2. The waterborne two-component matte varnish according to claim 1, wherein the main paint comprises the following components in parts by weight:
aqueous polyurethane dispersion: 52 parts of (1);
aqueous hydroxy polyacrylic acid dispersion: 25 parts of (1);
wetting agent: 0.5 part;
organic silicon flatting agent: 0.3 part;
dispersing agent: 0.2 part;
matting powder: 1.5 parts;
film-forming auxiliary agent: 5 parts of a mixture;
defoaming agent: 0.8 part;
anti-settling agent: 0.3 part;
aqueous hand feeling wax emulsion: 5 parts of a mixture;
rheological aid: 0.5 part;
mildew preventive: 0.2 part;
purified water: 9.7 parts.
3. The aqueous two-component matte top-coat paint according to claim 2, wherein the wetting agent is an anionic fluorine surfactant, and the organic silicon leveling agent is an organic silicon gemini surfactant.
4. The aqueous two-component matte top-coat paint according to claim 2, wherein the dispersant is TEGO-755W dispersant, and the matting agent is Grace SY7000 matting agent.
5. The aqueous two-component matte top-coat paint according to claim 2, wherein the defoamer is selected from a combination of two or more of TEGO901W, TEGO902W, BYK-022, AFCONA-2507.
6. The waterborne two-component matte top-coat paint according to claim 2, wherein the film-forming aid is a combination of two or more selected from alcohol ester-12, dipropylene glycol butyl ether, and N-methylpyrrolidone.
7. The waterborne two-component matte top-coat paint according to claim 1, wherein the curing agent is hydrophilic aliphatic polyisocyanate.
8. The process for the preparation of an aqueous two-component matte top-coat paint according to any one of claims 1 to 7, characterized in that it is obtained by the following preparation steps:
s1, adding the aqueous polyurethane dispersion and the aqueous hydroxyl polyacrylic acid dispersion into a stirring kettle, and stirring for 5-10min at 400-600 rpm;
s2, adding a mixture prepared by a wetting agent, a dispersing agent, a film-forming aid and a defoaming agent into a stirring kettle, and dispersing at a high speed of 1000-1200rpm for 30 min;
s3, sequentially adding an anti-settling agent and matting powder into the stirring kettle, and dispersing at high speed of 1000rpm for 20min at 900 plus materials, wherein the fineness is controlled to be less than 25 mu m;
s4, sequentially adding the water-based hand feeling wax emulsion, the organic silicon leveling agent, the rheological aid, the mildew preventive and the purified water into the stirring kettle, and dispersing for 10min at 800rpm under 600-;
s5, mixing the main paint, the curing agent and the purified water according to the weight ratio of 100:15:12, and uniformly stirring to obtain the water-based double-component matte clear finish paint.
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Cited By (6)
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| CN112625576A (en) * | 2020-12-18 | 2021-04-09 | 青岛爱尔家佳新材料股份有限公司 | Water-based semi-gloss polyurethane finish paint and preparation method thereof |
| CN113943526A (en) * | 2021-10-28 | 2022-01-18 | 河南立邦长润发科技材料有限公司 | Water-based two-component top-coat paint with low VOC (volatile organic compound) emission, and preparation method and application method thereof |
| 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 |
| 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 |
| CN116463038A (en) * | 2023-04-13 | 2023-07-21 | 澳达树熊涂料(惠州)有限公司 | Waterborne two-component self-repairing scratch matte wood coating and preparation method thereof |
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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 |
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