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Aqueous coating composition and coating method using same

一种水性涂料、组合物的技术，应用在对表面涂布液体的装置、导电涂料、聚脲/聚氨酯涂料等方向，能够解决成膜不良、省略预热工序困难、精加工外观不良等问题，达到耐水性和耐久性优良、附着性优良的效果

Inactive Publication Date: 2015-06-17
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the actual coating line, from the viewpoint of saving space and energy, it is required to delete the preheating process and reduce the baking temperature, etc., but if the drying speed is accelerated by reducing the film thickness of the primer , there will be poor film formation due to the booth environment (especially low humidity conditions below 65% relative humidity), accompanied by poor finish appearance, and there will also be problems that cannot be ensured due to poor film formation. conductivity problem
In addition, in multi-layer coatings, it is difficult to omit the preheating process from the viewpoint of not only the finish after the top coat but also the physical properties of the coating such as water resistance.

Method used

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  • Aqueous coating composition and coating method using same
  • Aqueous coating composition and coating method using same
  • Aqueous coating composition and coating method using same

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0222] Add "Sumidur N-3300" (trade name, Bayer Urethane Co., Ltd. polyisocyanate containing isocyanurate structure derived from hexamethylene diisocyanate, solid content concentration about 100%, isocyanate group content rate 21.8%) 480 parts, ethyl acetate 150 parts and diisomalonate 365 parts of propyl ester, while stirring the content in a nitrogen flow, 4 parts of 28% methanol solution of sodium methoxide was added to the stirring container, and the content was further stirred at 65° C. for 8 hours. The amount of isocyanate in the obtained resin solution was 0.07 mol / Kg.

[0223] Add 870 parts of 4-methyl-2-pentanol to the reaction vessel, while maintaining the temperature of the reaction vessel at 90-95°C, distill off the solvent under reduced pressure for 3 hours, and then add 120 parts of 4-methyl-2-pentanol were used to obtain 1400 parts of a solution of a blocked polyisocyanate compound (C-1). The simple trap for solvent removal contained 183 parts of isopropanol. ...

preparation example 2

[0225] Add 480 parts of "Sumidur N-3300" and 150 parts of ethyl acetate to a reaction vessel equipped with a thermometer, a temperature controller, a stirring device, a reflux condenser, a nitrogen introduction tube, a dropping device and a simple trap for solvent removal , 330 parts of diisopropyl malonate and 27 parts of isopropyl acetoacetate, while stirring the contents in a nitrogen stream, add 4 parts of 28% methanol solution of sodium methoxide to the reaction vessel, and then stir at 65°C Contents 8 hours. The amount of isocyanate in the obtained resin solution was 0.08 mol / Kg.

[0226] Add 870 parts of 4-methyl-2-pentanol to the reaction vessel, while maintaining the temperature of the reaction vessel at 90-95°C, distill off the solvent under reduced pressure for 3 hours, and then add 120 parts of 4-methyl-2-pentanol were used to obtain 1390 parts of a solution of a blocked polyisocyanate compound (C-2). The simple trap for solvent removal contained 173 parts of iso...

preparation example 3

[0228] Add 480 parts of "Sumidur N-3300" and 150 parts of ethyl acetate to a reaction vessel equipped with a thermometer, a temperature controller, a stirring device, a reflux condenser, a nitrogen introduction tube, a dropping device and a simple trap for solvent removal , 280 parts of diethyl malonate and 30 parts of ethyl isobutyryl acetate, while stirring the contents in a nitrogen stream, add 4 parts of 28% methanol solution of sodium methoxide to the reaction vessel, and then stir at 65°C Contents 8 hours. The amount of isocyanate in the obtained resin solution was 0.08 mol / Kg.

[0229] Add 870 parts of 4-methyl-2-pentanol to the reaction vessel, while maintaining the temperature of the reaction vessel at 90-95°C, distill off the solvent under reduced pressure for 3 hours, and then add 120 parts of 4-methyl-2-pentanol were used to obtain 1350 parts of a solution of a blocked polyisocyanate compound (C-3). The simple trap for solvent removal contained 133 parts of ethan...

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Abstract

The objective of the present invention is to provide: an aqueous coating composition which has excellent adhesiveness to a plastic substrate and which is capable of forming a multilayer coating film, which has excellent finishing property and water resistance and in which mixing of the layers does not occur even when preheating is not conducted after coating and the next process of applying a finishing coat is performed thereafter; and a coating method using the composition. This aqueous coating composition is characterized by comprising an aqueous dispersion of a modified polyolefin (A), an aqueous acrylic resin (B) and a blocked polyisocyanate compound having a specific blocked isocyanate (C).

Description

【Technical field】 [0001] The present invention relates to excellent adhesion to plastic substrates, and even if the surface layer coating in the next process is carried out without preheating after coating, no mixed layers will occur, and the finish can be formed and the water resistance is excellent. A water-based coating composition for a multi-layer coating film, and a coating method using the composition. 【Background technique】 [0002] Plastic molded products such as polyolefins are used in many cases as parts such as automobile exterior panels and home appliances. In addition, these molded products are often precoated with a primer containing chlorinated polyolefin or the like in order to improve the adhesion between the top coating film and the molded product. In this primer, from the viewpoint of the solubility of chlorinated polyolefin, aromatic hydrocarbon-based organic solvents such as toluene and xylene have been used, and in recent years, water-based primers ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D5/00C09D5/02C09D123/26C09D133/00
CPCC09D5/002C09D5/24C09D123/26C09D175/04C08L2205/035C08L2205/025C08L33/00C08L75/04C08L67/00C08L61/28C08K2003/2237C08K2003/2241C09D4/06C08G18/792C08G18/8064C08G18/8093C08G18/283C09D5/022C08G18/4833C08G18/6204C08G18/6254C08G18/706C08G18/4063C08G18/4263Y10T428/31551C08G18/10C08G18/2895C09D133/00B05D1/36B05D7/52C09D133/10
Inventor 小仓一隆永野裕幸五十岚浩史小畑政示
Owner KANSAI PAINT CO LTD
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