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A water-based paint for plastic products

A technology for water-based coatings and plastic products, applied in pigment slurry, polyurea/polyurethane coatings, coatings, etc., can solve the problems of difficult dispersion, poor covering power, uneven chromaticity, etc., and achieve excellent compatibility, stability, Good coverage and even shade

Active Publication Date: 2022-03-04
洁士美建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon black is a widely used pigment. It is difficult to disperse in water-based resin emulsion, and it is prone to the phenomenon of color paste aggregation and secondary thickening; when it is coated on plastic parts, the adhesion is poor and the chroma is not Uniform and therefore poor coverage

Method used

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  • A water-based paint for plastic products

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] Preparation of Phospholipid-Based Wetting and Dispersing Agents:

[0027] PEGMA (Mn=300g / mol), 4-cyano-4-(thiocarbonylbenzoyl)valeric acid (dithio reagent) and AIBN were added to the reaction flask at a molar ratio of 30:1:0.01, Add 1,4-dioxane and stir to dissolve it, react at 60° C. for 2 h under nitrogen atmosphere, and then precipitate in anhydrous methanol to obtain pPEGMA with a molecular weight of 8300 g / mol.

[0028] Add 20g of soybean lecithin, 0.8g of cation exchange resin and 0.7g of acetic acid into the reaction flask, stir and heat up to 50°C, slowly add a certain amount of 5g of hydrogen peroxide dropwise, after the dropwise addition, continue to stir and react for 5h; Filtrate after the end, and the filtrate is treated with an alkaline solution to neutrality and then concentrated to obtain epoxidized soybean lecithin;

[0029] In terms of amino groups in epoxidized soybean lecithin, its mol ratio with glycidyl methacrylate (GMA) is 1:1.2, then the amount...

Embodiment 1

[0036] Example 1: 15 parts of polyurethane acrylic resin and 15 parts of high hydroxyl acrylic resin, 10 parts of carbon black slurry, 1 part of polyether modified acrylic leveling agent, 1 part of polyester accelerator, 1 part of dipropylene glycol monomethyl ether and 1 part propylene glycol monomethyl ether acetate, 2 parts cymel 325 and 20 parts water.

[0037] Carbon black slurry: mix 6wt% of wetting and dispersing agent A with 40wt% of carbon black pigment, add the carbon black pigment slowly in stages, stir and disperse quickly during the addition process; continue stirring for 30 minutes after adding the carbon black pigment, then add 1wt% wetting and dispersing agent B, finally add water to make the total mass 100%, continue to stir until a uniform slurry is obtained; finally, ball mill in a ball mill to obtain a carbon black slurry.

Embodiment 2

[0038] Example 2: 20 parts of polyurethane acrylic resin and 20 parts of high hydroxyl acrylic resin, 15 parts of carbon black pulp, 1.5 parts of polyether modified acrylic leveling agent, 1.5 parts of polyester accelerator, 1.5 parts of dipropylene glycol monomethyl ether and 1 part propylene glycol monomethyl ether acetate, 2 parts cymel 325 and 25 parts water.

[0039] Carbon black slurry: Mix 7wt% of wetting and dispersing agent A with 50wt% of carbon black pigment, add the carbon black pigment slowly in stages, stir and disperse quickly during the addition process; continue stirring for 30 minutes after adding the carbon black pigment, then add 1wt% wetting and dispersing agent B, finally add water to make the total mass 100%, continue to stir until a uniform slurry is obtained; finally, ball mill in a ball mill to obtain a carbon black slurry.

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Abstract

This case involves a water-based coating for plastic products, including the following components: resin, carbon black slurry, acrylic leveling agent, adhesion promoter, film-forming aid, curing agent and water; wherein, the carbon black slurry includes : Wetting and dispersing agent A, carbon black pigment and wetting and dispersing agent B. The components of the water-based paint provided by the invention have excellent compatibility and stability. The carbon black pigment is pre-mixed with the wetting and dispersing agent to form a carbon black slurry and added to the water-based paint, which avoids poor dispersion when the carbon black is directly added. Equal problem; the wetting and dispersing system in carbon black slurry has a suitable viscosity-reducing ability, avoids atavism, uniform chroma, and good hiding power; at the same time, it has rich anchoring groups, which can effectively consolidate carbon black pigments and water-based resin emulsions And the stability between other additives; form a stable coating, and form a flat coating film on the surface of the plastic plate, with excellent water resistance, adhesion and other properties.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a water-based coating for plastic products. Background technique [0002] In people's daily life, plastic products are widely used, and with the continuous development of social economy, people's requirements for plastic surface properties are getting higher and higher. When plastic products are processed and molded, they will have uneven color, and they will easily age and become brittle after molding, and there will also be problems such as contamination and static electricity. The modification method of general plastics is usually to add appropriate additives and additives when plastics are synthesized. However, the low surface energy and poor wettability of plastic products have not been greatly improved. The above defects and problems can be avoided by applying a layer of paint on the plastic surface. [0003] Coatings for plastics have been put into a lot of research as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/14C09D133/00C09D151/02C09D153/00C09D17/00C09D7/61C09D7/65C08F251/02C08F220/06C08F220/60C08F293/00
CPCC09D175/14C09D133/00C09D7/61C09D7/65C09D17/001C09D17/005C08F251/02C08F293/00C08L33/00C08L51/02C08L53/00C08K3/04C08F220/06C08F220/606C08L75/14
Inventor 周寅飞
Owner 洁士美建材科技有限公司
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