Polyurethane odorless, highly transparent, fully matte, skin-friendly clear surface coating material and preparation method

Abstract

The present invention belongs to the field of chemical coatings, and in particular to a polyurethane net odor high-transparency full matte skin feeling clear surface coating material and preparation method. The material is prepared by evenly allocating a main agent, a curing agent and a diluent by weight ratio; by weight, the main agent is prepared by the following raw materials: 35-55 parts of alkyd resin, 10-25 parts of adipic acid polyester polyol resin, 1-10 parts of butyl acetate, 3-8 parts of ethyl acetate, 5-20 parts of nitrocellulose, 7-15 parts of organic matting powder, 0.1-0.5 parts of defoaming agent, 0.3-1 parts of dispersant, 1-5 parts of anti-settling agent and 0.1-0.5 parts of leveling agent. The present invention is based on adipic acid polyester polyol resin as the main body, and the skin feeling effect achieved by collocation of part of the leveling agent is better and more unique than conventional clear topcoat feel, and the skin feeling effect is permanent, and adipic acid polyester can also react with alkyd resin to form a tight three-dimensional grid structure, thereby improving the adhesion and chemical resistance of the coating.

Description

Technical Field

[0001] The invention belongs to the field of chemical coatings, and in particular relates to a polyurethane odorless, highly transparent, fully matte skin-feeling, clear-surface coating material and a preparation method thereof. Background Art

[0002] As living standards improve, consumption levels are gradually upgrading, and consumers' aesthetics are increasingly leaning towards casual, fashionable, and personalized styles. Skin-feel paint, named for its baby-skin feel, is popular for its smoothness, slight elasticity, delicate texture, and superior texture.

[0003] The conventional matte and clear surface feel is provided by adding feel additives. The feel of this kind of additives is basically smooth and slippery, which is difficult to achieve the skin-feel effect. Moreover, the addition of a large amount of additives will lead to poor dry heat resistance of the coating. The existing skin-feel paint has poor adhesion on hard substrates due to its elastic material and is easily scratched and fallen off by hard objects. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to overcome the shortcomings of the existing technology and provide a polyurethane odorless, highly transparent, matte skin-feeling clear surface coating material and preparation method, so as to achieve the effect of making the coating have a unique skin feel and improving dry heat resistance and adhesion.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A method for preparing a polyurethane odorless, high-transparency, matte, skin-feeling, clear surface coating material, comprising uniformly mixing a main agent, a curing agent, and a diluent according to a weight ratio to obtain the material;

[0007] The main agent is obtained by uniformly dispersing the following raw materials in parts by weight: 35-55 parts of alkyd resin, 10-25 parts of adipic acid polyester polyol resin, 1-10 parts of butyl acetate, 3-8 parts of ethyl acetate, 5-20 parts of nitrocellulose, 7-15 parts of organic matting powder, 0.1-0.5 parts of defoaming agent, 0.3-1 parts of dispersant, 1-5 parts of anti-settling agent and 0.1-0.5 parts of leveling agent;

[0008] The diluent is obtained by uniformly dispersing the following raw materials: 15-25 parts of xylene, 55-75 parts of butyl acetate and 5-20 parts of propylene glycol methyl ether acetate.

[0009] Furthermore, the defoaming agent is selected from modified silicone defoaming agents.

[0010] Furthermore, the dispersant is selected from polymer dispersants.

[0011] Furthermore, the anti-settling agent includes polyamide wax.

[0012] Furthermore, the leveling agent is selected from silicone leveling agents.

[0013] Furthermore, the curing agent is obtained by uniformly dispersing the following raw materials in parts by weight: 45-70 parts of aromatic isocyanate, 15-35 parts of trimer isocyanate and 20-35 parts of butyl acetate.

[0014] Furthermore, the weight ratio of the main agent, curing agent and diluent is 1-1.5:0.5-0.8:0.5-1.

[0015] Furthermore, the main agent is prepared by mixing the alkyd resin, adipic acid polyester polyol resin, butyl acetate, defoamer, dispersant and anti-settling agent, dispersing the mixture at a speed of 600-800 r / min for 5-10 minutes, adding the organic matting powder, dispersing the mixture at a speed of 1000-1200 r / min for 10-15 minutes, then adding the nitrocellulose, leveling agent and ethyl acetate, dispersing the mixture at a speed of 600-800 r / min for 5-10 minutes, and filtering the mixture through a 160-200 mesh filter.

[0016] The diluent is prepared by mixing the xylene, butyl acetate and propylene glycol methyl ether acetate, dispersing the mixture at a speed of 400-800 r / min for 5-10 minutes, and filtering the mixture through a 300-400 mesh filter.

[0017] The curing agent is prepared by mixing the aromatic isocyanate, trimer isocyanate and butyl acetate, dispersing the mixture at a rotation speed of 500-1000 r / min for 5-10 minutes, and filtering the mixture through a 300-400 mesh filter.

[0018] The present invention also provides application of the above-mentioned polyurethane odorless, highly transparent, matte skin-feeling, clear-surface coating material in architectural decoration.

[0019] Conventional matte clear surface coating materials mainly achieve the purpose of matting by adding silica matting powder. The matter the gloss requirement, the greater the amount of matting powder added. Since the refractive index of silica matting powder is quite different from that of alkyd resin, the more silica matting powder is added, the greater the impact on transparency. Therefore, the transparency of conventional full matte clear surface coating materials will not be very good, and the transparency will be worse after recoating.

[0020] The polyurethane odorless, highly transparent, matte skin-feeling, clear surface coating material provided by the present invention uses organic matting powder instead of conventional silica matting powder. Since the refractive index of the organic matting powder is close to that of the resin, it does not affect the transparency of the coating material film. Even a large amount of addition has no effect on the transparency of the coating material film, so the new product has obvious advantages in transparency.

[0021] The beneficial effects of the present invention are:

[0022] 1. The skin feel effect achieved by the present invention using adipic acid polyester polyol resin as the main body and combining it with some leveling agents is better and more unique than that of conventional clear topcoat, and the skin feel effect is permanent, which is far superior to the feel effect provided by conventional additives.

[0023] 2. The adipic acid polyester in the present invention can also react with alkyd resin to form a tight three-dimensional grid structure, thereby improving the adhesion and chemical resistance of the coating.

[0024] 3. The transparency of conventional products will be significantly deteriorated after furniture is reworked and repainted. Some furniture factories will grind off the entire coating material film and repaint it. In more serious cases, the furniture may be directly scrapped. The coating provided by the present invention has no effect on the transparency of the product after rework and repainting, and the qualified rate of finished furniture inspection is higher, which can improve production efficiency. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described in detail below in conjunction with the embodiments, but the protection scope of the present invention is not limited to the following.

[0026] In the following embodiments, the alkyd resin is selected from the odorless resin 31045 produced by Changxing Chemical, the adipic acid polyester polyol resin is selected from RAF80 produced by Bogao, the organic matting powder is selected from M6 produced by Albemarle, the dispersant is selected from 4010 produced by Efka, the anti-settling agent is selected from 6900-20X anti-settling agent produced by Desbaron, and the defoaming agent is selected from 5300 product produced by Deqian Company.

[0027] Example 1

[0028] A method for preparing a polyurethane odorless, high-transparency, matte, skin-feeling, clear surface coating material comprises uniformly mixing a main agent, a curing agent, and a diluent in a weight ratio of 1:0.5:0.5 to obtain the material.

[0029] The main agent is prepared according to the following method: 50 parts of the alkyd resin, 10 parts of adipic acid polyester polyol resin, 7 parts of butyl acetate, 0.3 parts of a defoamer, 0.8 parts of a dispersant and 4 parts of an anti-settling agent are mixed, and the mixture is dispersed at a speed of 700 r / min for 10 minutes, 11 parts of the organic matting powder are added, and the mixture is dispersed at a speed of 1000 r / min for 15 minutes, and then 8 parts of nitrocellulose, 0.3 parts of a leveling agent and 8.6 parts of ethyl acetate are added, and the mixture is dispersed at a speed of 600 r / min for 5 minutes, and filtered through a 200-mesh filter to obtain the obtained product;

[0030] The diluent is prepared by the following method: 20 parts of xylene, 68 parts of butyl acetate and 12 parts of propylene glycol methyl ether acetate are mixed, dispersed at a speed of 600 r / min for 8 minutes, and filtered through a 300-mesh filter to obtain;

[0031] The curing agent is prepared by the following method: 45 parts of the aromatic isocyanate, 25 parts of trimer isocyanate and 30 parts of butyl acetate are mixed, dispersed at a speed of 800 r / min for 10 minutes, and filtered through a 300-mesh filter to obtain the curing agent.

[0032] Example 2

[0033] A method for preparing a polyurethane odorless, high-transparency, matte skin-feeling, clear surface coating material comprises uniformly mixing a main agent, a curing agent, and a diluent in a weight ratio of 1.3:0.6:0.8 to obtain the material.

[0034] The main agent is prepared according to the following method: 37 parts of the alkyd resin, 23 parts of adipic acid polyester polyol resin, 8 parts of butyl acetate, 0.2 parts of a defoamer, 0.9 parts of a dispersant and 5 parts of an anti-settling agent are mixed, and the mixture is dispersed at a speed of 1000 r / min for 5 minutes, 9 parts of the organic matting powder are added, and the mixture is dispersed at a speed of 1200 r / min for 10 minutes, and then 10 parts of the nitrocellulose, 0.2 parts of a leveling agent and 6.7 parts of ethyl acetate are added, and the mixture is dispersed at a speed of 800 r / min for 10 minutes, and filtered through a 200-mesh filter to obtain the obtained product;

[0035] The diluent is prepared by the following method: 20 parts of xylene, 60 parts of butyl acetate and 20 parts of propylene glycol methyl ether acetate are mixed, dispersed at a speed of 500 r / min for 5 minutes, and filtered through a 300-mesh filter to obtain;

[0036] The curing agent is prepared by the following method: 40 parts of the aromatic isocyanate, 30 parts of trimer isocyanate and 30 parts of butyl acetate are mixed, dispersed at a speed of 800 r / min for 10 minutes, and filtered through a 300-mesh filter to obtain the curing agent.

[0037] Comparative Example 1

[0038] A preparation method for a skin-feeling clear coating material, which differs from Example 1 in that the adipic acid polyester polyol resin in the main agent is replaced with the skin-feeling agent 5070DAK800 (purchased from Shanghai Deyu), and the remaining diluents, curing agents and preparation methods are the same.

[0039] The coatings prepared in the above embodiments and comparative examples were tested for technical indicators with reference to GB / T23997-2009. The test results are shown in Table 1.

[0040] Table 1

[0041]

[0042]

[0043] It can be clearly seen from Table 1 that the technical performance of each embodiment of the polyurethane odor-free, high-transparency, matte skin-feeling clear surface coating material provided by the present invention meets or exceeds the technical indicators in the national standard GB / T23997-2009, reaching the existing technical level. Compared with Comparative Example 1, the embodiments have better wear resistance, better adhesion, and unique feel. The skin feel retention rate of the paint film is still above 95% after 100 days, while that of Comparative Example 1 is only 48%.

[0044] The environmental protection test of the coatings prepared in the above embodiments was carried out with reference to GB18581-2020, and the test results are shown in Table 2.

[0045] Table 2

[0046]

[0047]

[0048] As can be seen from Table 2, the VOC (volatile organic compounds) and soluble heavy metals contained in each embodiment of the present invention are better than the GB18581-2020 standard, meet environmental and health requirements, and are safe and reliable to use.

[0049] The viscosity and film thickness of the polyurethane odorless, high-transparency, matte skin-feeling clear coating material prepared in each embodiment were tested, and the test results are shown in Table 3.

[0050]

[0051] It can be clearly seen from Table 3 that the viscosity of each embodiment of the present invention not only meets the requirements of surface coating material spraying, but also the transparency is not affected when the coating material film is applied thickly.

[0052] The foregoing description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the appended claims.

Claims

1. A method for preparing a polyurethane odorless, high-transparency, matte skin-feeling, clear surface coating material, characterized in that: The main agent, curing agent and diluent are evenly mixed according to the weight ratio to obtain the product; The main agent is obtained by uniformly dispersing the following raw materials in parts by weight: 35-55 parts of alkyd resin, 10-25 parts of adipic acid polyester polyol resin, 1-10 parts of butyl acetate, 3-8 parts of ethyl acetate, 5-20 parts of nitrocellulose, 7-15 parts of organic matting powder, 0.1-0.5 parts of defoaming agent, 0.3-1 parts of dispersant, 1-5 parts of anti-settling agent and 0.1-0.5 parts of leveling agent; The diluent is obtained by uniformly dispersing the following raw materials: 15-25 parts of xylene, 55-75 parts of butyl acetate and 5-20 parts of propylene glycol methyl ether acetate; The curing agent is obtained by uniformly dispersing the following raw materials by weight: 45-70 parts of aromatic isocyanate, 15-35 parts of trimer isocyanate and 20-35 parts of butyl acetate; The weight ratio of the main agent, curing agent and diluent is 1-1.5:0.5-0.8:0.5-1.

2. The method for preparing a polyurethane odorless, high-transparency, matte skin-feeling, clear surface coating material according to claim 1, characterized in that: The defoaming agent is selected from modified silicone defoaming agents.

3. The method for preparing a polyurethane odorless, high-transparency, matte skin-feeling, clear surface coating material according to claim 1, characterized in that: The dispersant is selected from polymer dispersants.

4. The method for preparing a polyurethane odorless, high-transparency, matte skin-feeling, clear surface coating material according to claim 1, characterized in that: The anti-settling agent includes polyamide wax.

5. The method for preparing a polyurethane odorless, high-transparency, matte skin-feeling, clear surface coating material according to claim 1, characterized in that: The leveling agent is selected from silicone leveling agents.

6. The method for preparing a polyurethane odorless, high-transparency, matte skin-feeling, clear surface coating material according to claim 1, characterized in that: The main agent is prepared by mixing the alkyd resin, adipic acid polyester polyol resin, butyl acetate, defoamer, dispersant and anti-settling agent, dispersing the mixture at a speed of 600-800 r / min for 5-10 minutes, adding the organic matting powder, dispersing the mixture at a speed of 1000-1200 r / min for 10-15 minutes, then adding the nitrocellulose, leveling agent and ethyl acetate, dispersing the mixture at a speed of 600-800 r / min for 5-10 minutes, and filtering the mixture through a 160-200 mesh filter. The diluent is prepared by mixing the xylene, butyl acetate and propylene glycol methyl ether acetate, dispersing the mixture at a speed of 400-800 r / min for 5-10 minutes, and filtering the mixture through a 300-400 mesh filter. The curing agent is prepared by mixing the aromatic isocyanate, trimer isocyanate and butyl acetate, dispersing the mixture at a rotation speed of 500-1000 r / min for 5-10 minutes, and filtering the mixture through a 300-400 mesh filter.

7. A polyurethane odorless, highly transparent, matte skin-feeling, clear surface coating material obtained by the preparation method according to any one of claims 1 to 6.

8. Use of the polyurethane odorless, highly transparent, matte skin-feeling, clear surface coating material according to claim 7 in architectural decoration.

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