Environment-friendly low-temperature curing water-based skin-touch coating as well as preparation method and application thereof

Abstract

The invention provides an environment-friendly low-temperature curing water-based skin-touch coating as well as a preparation method and application thereof.The environment-friendly low-temperature curing water-based skin-touch coating comprises a component A and a component B. The component A comprises the following components in parts by weight: 55-65 parts of water-based modified polyurethane resin; 0.1 to 0.2 part of a defoaming agent A; 0.1 to 0.5 part of a wetting agent; 0.5 to 1 part of a water-based drier; 1-2 parts of a coalescing agent; 1-2 parts of a thickening agent; 1-3 parts of matting powder; 0-1 part of a water-based hand feeling assistant; 0.5 to 1 part of a leveling agent; 3-5 parts of color paste; and the balance of water. The component B comprises the following component in parts by weight: 55-65 parts of a water-based curing agent; and 35-45 parts of a diluent. According to the coating, solvent use is greatly reduced in the aspect of raw materials, the environment-friendly performance is good, meanwhile, the low-temperature curing requirement can be met, the baking temperature and baking time do not need to be increased, and compared with an existing coating, the coating has the advantages of being low in cost, saving energy, reducing emission and reducing the product use cost; the components of the coating contain the water-based hand feeling auxiliary agent, so that the requirement of skin feeling can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to an environmentally friendly low-temperature curing water-based skin-feel coating and a preparation method and application thereof. Background Art

[0002] Plastic products made of materials such as ABS (Acrylonitrile Butadiene Styrene) and PC (Polycarbonate) must meet the requirements of low-temperature curing due to their special characteristics. Traditional low-temperature curing coatings use a large amount of volatile solvents to accelerate the drying speed of the paint film in order to meet the characteristics of low-temperature curing. The use of a large amount of volatile solvents will produce organic volatiles, which in turn causes the coating to fail to meet environmental protection requirements.

[0003] In the prior art, in order to reduce the use of solvents, the method adopted is to extend the baking and curing time or the curing temperature. Extending the baking and curing time will reduce production efficiency, while extending the curing temperature will increase energy consumption and increase the cost of use. Summary of the invention

[0004] The purpose of the present invention is to provide an environmentally friendly low-temperature curing water-based skin-feel coating and a preparation method and application thereof, which can at least solve one of the above problems.

[0005] According to one aspect of the present invention, an environmentally friendly low-temperature curing water-based skin-feel coating is provided, comprising component A and component B, wherein component A comprises the following components in parts by weight:

[0006] Water-based modified polyurethane resin, 55-65 parts;

[0007] Defoamer A, 0.1-0.2 parts;

[0008] Wetting agent, 0.1-0.5 parts;

[0009] Water-based drying agent, 0.5-1 part;

[0010] Film-forming aid, 1-2 parts;

[0011] Thickener, 1-2 parts;

[0012] Matting powder, 1-3 parts;

[0013] Water-based feel additive, 0-1 part;

[0014] Leveling agent, 0.5-1 part;

[0015] Color paste, 3-5 parts;

[0016] The balance is water;

[0017] Component B includes the following components in parts by weight:

[0018] Water-based curing agent, 55-65 parts;

[0019] Diluent, 35-45 parts.

[0020] In some embodiments, the water-based modified polyurethane resin is 60 parts, the defoamer A is 0.1 parts, the wetting agent is 0.5 parts, the water-based drying agent is 0.6 parts, the film-forming aid is 1.5 parts, the thickener is 1.5 parts, the matting powder is 2 parts, the water-based feel aid is 0.5 parts, the leveling agent is 0.5 parts, the color paste is 3.6 parts, and the water is 29.2 parts.

[0021] In some embodiments, the colorant is a 30% black colorant.

[0022] In some embodiments, the black color paste includes the following components in parts by weight:

[0023] BCS, 1-3 copies;

[0024] Dispersant A, 8-15 parts;

[0025] Dispersant B, 1-5 parts;

[0026] Carbon black powder, 25-35 parts;

[0027] Defoamer B, 0.1-0.5 parts;

[0028] The balance is water.

[0029] In some embodiments, the film-forming aid is at least one of dipropylene glycol methyl ether or dipropylene glycol butyl ether.

[0030] In some embodiments, the diluent is propylene glycol methyl ether acetate.

[0031] In some embodiments, the water is deionized water.

[0032] According to another aspect of the present invention, there is also provided a method for preparing an environmentally friendly low-temperature curing water-based skin-feel coating, characterized in that it comprises at least the following steps:

[0033] S1. Preparation of color paste: water, BCS, dispersant A, dispersant B, carbon black powder and defoamer B are sequentially added into a stirring device, the speed of the stirring device is adjusted to 1500r / min, stirring for 30min, and then grinding to a fineness of less than 15μm to obtain a color paste for standby use;

[0034] S2, preparing component A: sequentially add water-based modified polyurethane resin, water, defoamer A, wetting agent, water-based drying agent, film-forming aid, thickener, matting powder, water-based feel aid, leveling agent and the color paste prepared in step S1 into a stirring device, stir evenly to obtain component A, and set aside;

[0035] S3, preparing component B: diluting the water-based curing agent with a diluent to obtain component B for standby use;

[0036] S4. Mix component A and component B to obtain an environmentally friendly low-temperature curing water-based skin-feel coating.

[0037] In some embodiments, in step S2, the speed of the stirring device is first controlled at 500 r / min, and then the water-based modified polyurethane resin, water, defoaming agent A, wetting agent, water-based drying agent, film-forming aid and thickener are sequentially added to the stirring device. After stirring for 5-10 minutes, the matting powder is added and the speed of the stirring device is controlled at 1500 r / min. Stir for 30 minutes, and then the speed of the stirring device is controlled at 500 r / min, and then the water-based feel aid, leveling agent and color paste are added in sequence.

[0038] According to another aspect of the present invention, an application of an environmentally friendly low-temperature curing water-based skin-feel coating is also provided. The environmentally friendly low-temperature curing water-based skin-feel coating prepared by the preparation method of the environmentally friendly low-temperature curing water-based skin-feel coating according to any one of claims 8 to 9 is suitable for surface treatment of plastic products. The specific application method comprises the following steps:

[0039] A. Before spraying, the surface of the plastic product should be treated;

[0040] B. Spray environmentally friendly low-temperature curing water-based skin-feel paint on the surface of the equipment by spraying, and the paint film thickness is controlled at 10-30μm;

[0041] C. Bake at 60-65℃ for 25-30min to cure.

[0042] Beneficial effects of the present invention:

[0043] The present invention provides an environmentally friendly, low-temperature curing, water-based, skin-feel coating, which greatly reduces the use of solvents in raw materials and has good environmental performance. At the same time, it can meet the requirements of low-temperature curing and does not need to increase the baking temperature and baking time. Compared with existing coatings, it has the advantages of low cost, energy saving and emission reduction, and reduced product use cost; in addition, since the coating composition contains a water-based feel additive, it can also meet the needs of skin feel; after testing, the environmentally friendly, low-temperature curing, water-based, skin-feel coating also has the properties of high temperature resistance, high humidity resistance, salt resistance, sweat resistance, fine feel, and no graininess. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below.

[0045] The environmentally friendly low-temperature curing water-based skin-feel coating of the present invention comprises component A and component B, wherein component A comprises the following components in parts by weight:

[0046] Water-based modified polyurethane resin, 55-65 parts;

[0047] Defoamer A, 0.1-0.2 parts;

[0048] Wetting agent, 0.1-0.5 parts;

[0049] Water-based drying agent, 0.5-1 part;

[0050] Film-forming aid, 1-2 parts;

[0051] Thickener, 1-2 parts;

[0052] Matting powder, 1-3 parts;

[0053] Water-based feel additive, 0-1 part;

[0054] Leveling agent, 0.5-1 part;

[0055] Color paste, 3-5 parts;

[0056] The balance is water;

[0057] Component B includes the following components in parts by weight:

[0058] Water-based curing agent, 55-65 parts;

[0059] Diluent, 35-45 parts.

[0060] Preferably, the water-based modified polyurethane resin is 60 parts, the defoamer A is 0.1 parts, the wetting agent is 0.5 parts, the water-based drying agent is 0.6 parts, the film-forming aid is 1.5 parts, the thickener is 1.5 parts, the matting powder is 2 parts, the water-based feel aid is 0.5 parts, the leveling agent is 0.5 parts, the color paste is 3.6 parts, and the water is 29.2 parts.

[0061] Preferably, the color paste is 30% black color paste.

[0062] The black color paste comprises the following components by weight:

[0063] BCS (ethylene glycol monobutyl ether), 1-3 parts;

[0064] Dispersant A, 8-15 parts;

[0065] Dispersant B, 1-5 parts;

[0066] Carbon black powder, 25-35 parts;

[0067] Defoamer B, 0.1-0.5 parts;

[0068] The balance is water.

[0069] Therefore, the color paste of this embodiment has better weather resistance and drying properties than the color paste on the market.

[0070] Preferably, the film-forming aid is at least one of dipropylene glycol methyl ether (DPM) or dipropylene glycol butyl ether (DPNB).

[0071] Preferably, the diluent is propylene glycol methyl ether acetate (PMA).

[0072] Preferably, the water is deionized water.

[0073] Preferably, the water-based modified polyurethane resin is a water-based modified polyurethane resin of model 64103 manufactured by Kunshan Wanjie New Material Technology Co., Ltd.

[0074] Defoamer A is Tego902w defoamer;

[0075] The wetting agent is Tego4100 wetting agent;

[0076] The water-based drying agent is OS-1330 water-based two-component polyurethane drying agent purchased from Guangzhou Guanzhi New Material Technology Co., Ltd.;

[0077] The thickener is Hemingway WT-105A water-based paint thickener;

[0078] The matting powder is Japanese Tosoh E1011 matting powder;

[0079] The water-based feel additive is Dow Corning DC-51 water-based feel additive;

[0080] The leveling agent is BYK-381 leveling agent from Germany;

[0081] The water-based curing agent is Covestro XP 2487 / 1 water-based curing agent;

[0082] Dispersant A uses Tech-6208 dispersant produced by Shanghai Tiger Polymer Technology Co., Ltd. Tech-6208 is a polymer dispersant with special pigment-affinity groups. It has excellent adsorption and dispersion capabilities for silicon dioxide, titanium dioxide, metal powder, carbon black, etc., and has excellent compatibility with various water-based resin systems.

[0083] Dispersant B uses German BYK-190 dispersant;

[0084] The carbon black powder adopts Japan Mitsubishi MA100 carbon black powder;

[0085] Defoamer B uses German BYK-024 defoamer.

[0086] The present invention provides an environmentally friendly, low-temperature curing, water-based, skin-feel coating, which greatly reduces the use of solvents in raw materials and has good environmental performance. At the same time, it can meet the requirements of low-temperature curing and does not need to increase the baking temperature and baking time. Compared with existing coatings, it has the advantages of low cost, energy saving and emission reduction, and reduced product use cost; in addition, since the coating composition contains a water-based feel additive, it can also meet the needs of skin feel; after testing, the environmentally friendly, low-temperature curing, water-based, skin-feel coating also has the properties of high temperature resistance, high humidity resistance, salt resistance, sweat resistance, fine feel, and no graininess.

[0087] The present invention also discloses a method for preparing the above-mentioned environmentally friendly low-temperature curing water-based skin-feel coating, which at least comprises the following steps:

[0088] S1. Preparation of color paste: water, BCS, dispersant A, dispersant B, carbon black powder and defoamer B are sequentially added into a stirring device, the speed of the stirring device is adjusted to 1500r / min, stirring for 30min, and then grinding to a fineness of less than 15μm to obtain a color paste for standby use;

[0089] S2, preparing component A: sequentially add water-based modified polyurethane resin, water, defoamer A, wetting agent, water-based drying agent, film-forming aid, thickener, matting powder, water-based feel aid, leveling agent and the color paste prepared in step S1 into a stirring device, stir evenly to obtain component A, and set aside;

[0090] S3, preparing component B: diluting the water-based curing agent with a diluent to obtain component B for standby use;

[0091] S4. Component A and component B are mixed in a certain proportion to obtain an environmentally friendly low-temperature curing water-based skin-feel coating.

[0092] In step S2, the speed of the stirring device is first controlled at 500 r / min, and then the water-based modified polyurethane resin, water, defoamer A, wetting agent, water-based drying agent, film-forming aid and thickener are added to the stirring device in sequence. After stirring for 5-10 minutes, the matting powder is added and the speed of the stirring device is controlled at 1500 r / min. Stir for 30 minutes, and then the speed of the stirring device is controlled at 500 r / min, and then the water-based feel aid, leveling agent and color paste are added in sequence.

[0093] The present invention also discloses an application of an environmentally friendly low-temperature curing water-based skin-feel coating prepared by the preparation method of the environmentally friendly low-temperature curing water-based skin-feel coating. The environmentally friendly low-temperature curing water-based skin-feel coating is suitable for surface treatment of plastic products. The specific application method comprises the following steps:

[0094] A. Before spraying, the surface of the plastic product should be treated;

[0095] B. Spray environmentally friendly low-temperature curing water-based skin-feel paint on the surface of the equipment by spraying, and the paint film thickness is controlled at 10-30μm;

[0096] C. Bake at 60-65°C for 25-30 minutes to cure. The baking temperature is preferably 65°C, and the curing time is usually only 25 minutes.

[0097] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods in the following examples without specifying specific conditions are carried out according to conventional methods and conditions, or selected according to the product specifications.

[0098] Example 1

[0099] This embodiment provides an environmentally friendly low-temperature curing water-based skin-feel coating. The specific components and proportions of the environmentally friendly low-temperature curing water-based skin-feel coating are shown in Table 1 below:

[0100] Table 1: Proportion table of the environmentally friendly low-temperature curing water-based skin-feel coating of Example 1

[0101]

[0102] The specific components and proportions of the color paste in the above-mentioned environmentally friendly low-temperature curing water-based skin-feel coating are shown in Table 2 below:

[0103] Table 2: Proportion table of the color paste of Example 1

[0104] Components Weight BCS 2 Dispersant A 10 Dispersant B 2 carbon black powder 30 Defoamer B 0.2 water 55.8

[0105] According to the ratio table in Table 1-2 above, the above-mentioned environmentally friendly low-temperature curing water-based skin-feel coating is prepared by the following preparation method, which specifically includes the following steps:

[0106] S1. Preparation of color paste: 55.8 parts of water, 2 parts of BCS, 10 parts of dispersant A, 2 parts of dispersant B, 30 parts of carbon black powder, and 0.2 parts of defoamer B are sequentially added into a stirring device, the speed of the stirring device is adjusted to 1500r / min, stirring for 30 minutes, and then grinding to a fineness of less than 15μm to obtain a black color paste for standby use;

[0107] S2, preparing component A: sequentially add 60 parts of water-based modified polyurethane resin, 29.2 parts of water, 0.1 parts of defoamer A, 0.5 parts of wetting agent, 0.6 parts of water-based drying agent, 1.5 parts of film-forming aid, 1.5 parts of thickener, 2 parts of matting powder, 0.5 parts of water-based feel aid, 0.5 parts of leveling agent and 3.6 parts of 30% black color paste prepared in step S1 into a stirring device, stir evenly, and prepare component A for standby use;

[0108] S3, preparing component B: diluting 60 parts of the water-based curing agent with 40 parts of the diluent to obtain component B for standby use;

[0109] S4. Component A and component B are mixed in a ratio of 100:10 to obtain an environmentally friendly low-temperature curing water-based skin-feel coating.

[0110] Example 2

[0111] This embodiment provides another environmentally friendly low-temperature curing water-based skin-feel coating. The specific components and proportions of the environmentally friendly low-temperature curing water-based skin-feel coating are shown in Table 3 below:

[0112] Table 3: Proportion table of the environmentally friendly low-temperature curing water-based skin-feel coating of Example 2

[0113]

[0114] Among them, the specific components and proportions of the color paste in the above-mentioned environmentally friendly low-temperature curing water-based skin-feel coating are consistent with those in Example 1.

[0115] According to the ratio tables in Table 2 and Table 3 above, the environmentally friendly low-temperature curing water-based skin-feel coating of this embodiment is prepared by the same preparation method as that of Example 1.

[0116] Example 3

[0117] This embodiment provides another environmentally friendly low-temperature curing water-based skin-feel coating. The specific components and proportions of the environmentally friendly low-temperature curing water-based skin-feel coating are shown in Table 4 below:

[0118] Table 4: Proportion table of the environmentally friendly low-temperature curing water-based skin-feel coating of Example 3

[0119]

[0120] Among them, the specific components and proportions of the color paste in the above-mentioned environmentally friendly low-temperature curing water-based skin-feel coating are consistent with those in Example 1.

[0121] According to the ratio tables in Table 2 and Table 4 above, the environmentally friendly low-temperature curing water-based skin-feel coating of this embodiment is prepared by the same preparation method as that of Example 1.

[0122] Example 4

[0123] This embodiment provides another environmentally friendly low-temperature curing water-based skin-feel coating. The specific components and proportions of the environmentally friendly low-temperature curing water-based skin-feel coating are shown in Table 5 below:

[0124] Table 5: Proportion table of the environmentally friendly low-temperature curing water-based skin-feel coating of Example 4

[0125]

[0126] Among them, the specific components and proportions of the color paste in the above-mentioned environmentally friendly low-temperature curing water-based skin-feel coating are consistent with those in Example 1.

[0127] According to the ratio tables in Table 2 and Table 5 above, the environmentally friendly low-temperature curing water-based skin-feel coating of this embodiment is prepared by the same preparation method as that of Example 1.

[0128] Example 5

[0129] The environmentally friendly low-temperature curing water-based skin-feel coatings prepared in the above Examples 1-4 were coated on the test plastic products according to the above application method, and the performance of the environmentally friendly low-temperature curing water-based skin-feel coatings prepared in the above Examples 1-4 was tested using the known national standard method. Specifically, the test items included salt resistance, high temperature and humidity resistance, sweat resistance, touch feel, etc. The performance test results of the environmentally friendly low-temperature curing water-based skin-feel coatings of Examples 1-4 are shown in Table 6 below:

[0130] Table 6: Performance test table of environmentally friendly low-temperature curing water-based skin-feel coatings of Examples 1-4

[0131]

[0132] According to the above data, the environmentally friendly low-temperature curing water-based skin-feel coating of the present invention not only has the characteristics of environmental protection and energy saving, and can be cured at low temperature, but also has excellent properties such as salt resistance, high temperature and high humidity resistance, and sweat resistance. At the same time, it also has a delicate touch and no granular touch.

[0133] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An environmentally friendly low-temperature curing water-based skin-feel coating, characterized in that: It comprises component A and component B, wherein component A comprises the following components in parts by weight: Water-based modified polyurethane resin, 55-65 parts; Defoamer A, 0.1-0.2 parts; Wetting agent, 0.1-0.5 parts; Water-based drying agent, 0.5-1 part; Film-forming aid, 1-2 parts; Thickener, 1-2 parts; Matting powder, 1-3 parts; Water-based feel additive, 0-1 part; Leveling agent, 0.5-1 part; Color paste, 3-5 parts; The balance is water; The second component includes the following components by weight: Water-based curing agent, 55-65 parts; Diluent, 35-45 parts.

2. The environmentally friendly low-temperature curing water-based skin-feel coating according to claim 1, characterized in that: The water-based modified polyurethane resin is 60 parts, the defoamer A is 0.1 parts, the wetting agent is 0.5 parts, the water-based drying agent is 0.6 parts, the film-forming aid is 1.5 parts, the thickener is 1.5 parts, the matting powder is 2 parts, the water-based feel aid is 0.5 parts, the leveling agent is 0.5 parts, the color paste is 3.6 parts, and the water is 29.2 parts.

3. The environmentally friendly low-temperature curing water-based skin-feel coating according to claim 1, characterized in that: The color paste is 30% black color paste.

4. The environmentally friendly low-temperature curing water-based skin-feel coating according to claim 3, characterized in that: The black color paste comprises the following components by weight: BCS, 1-3 copies; Dispersant A, 8-15 parts; Dispersant B, 1-5 parts; Carbon black powder, 25-35 parts; Defoamer B, 0.1-0.5 parts; The balance is water.

5. The environmentally friendly low-temperature curing water-based skin-feel coating according to claim 1, characterized in that: The film-forming aid is at least one of dipropylene glycol methyl ether and dipropylene glycol butyl ether.

6. The environmentally friendly low-temperature curing water-based skin-feel coating according to claim 1, characterized in that: The diluent is propylene glycol methyl ether acetate.

7. The environmentally friendly low-temperature curing water-based skin-feel coating according to claim 1 or 4, characterized in that: The water is deionized water.

8. A method for preparing an environmentally friendly low-temperature curing water-based skin-feel coating, characterized in that: At least the following steps are included: S1. Preparation of color paste: water, BCS, dispersant A, dispersant B, carbon black powder and defoamer B are sequentially added into a stirring device, the speed of the stirring device is adjusted to 1500r / min, stirring for 30min, and then grinding to a fineness of less than 15μm to obtain a color paste for standby use; S2, preparing component A: sequentially add water-based modified polyurethane resin, water, defoamer A, wetting agent, water-based drying agent, film-forming aid, thickener, matting powder, water-based feel aid, leveling agent and the color paste prepared in step S1 into a stirring device, stir evenly to obtain component A, and set aside; S3, preparing component B: diluting the water-based curing agent with a diluent to obtain component B for standby use; S4. Mix component A and component B to obtain an environmentally friendly low-temperature curing water-based skin-feel coating.

9. The method for preparing the environmentally friendly low-temperature curing water-based skin-feel coating according to claim 8, characterized in that: In step S2, the speed of the stirring device is first controlled at 500 r / min, and then the water-based modified polyurethane resin, water, defoamer A, wetting agent, water-based drying agent, film-forming aid and thickener are added to the stirring device in sequence. After stirring for 5-10 minutes, the matting powder is added and the speed of the stirring device is controlled at 1500 r / min. Stir for 30 minutes, and then the speed of the stirring device is controlled at 500 r / min, and then the water-based feel aid, leveling agent and color paste are added in sequence.

10. An application of an environmentally friendly low-temperature curing water-based skin-feel coating, characterized in that: The environmentally friendly low-temperature curing water-based skin-feel coating prepared by the preparation method of the environmentally friendly low-temperature curing water-based skin-feel coating according to any one of claims 8 to 9 is suitable for surface treatment of plastic products. The specific application method comprises the following steps: A. Before spraying, the surface of the plastic product should be treated; B. Spray environmentally friendly low-temperature curing water-based skin-feel paint on the surface of the equipment by spraying, and the paint film thickness is controlled at 10-30μm; C. Bake at 60-65℃ for 25-30min to cure.

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