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Water paint composition

A technology for water-based coatings and compositions, applied in polyester coatings, starch derivative coatings, polyurea/polyurethane coatings, etc., can solve the problems of high production cost, less application, and reduced water resistance and other coating film properties.

Inactive Publication Date: 2012-12-19
ANHUI JINDUN PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, this curable starch composition has a problem that, when the starch is made water-based, the carboxyl group introduced for hydrophilization remains in the coating film, which reduces the coating film performance such as water resistance.
At present, the method of improving weather resistance of water-based coatings is mainly to use fluorocarbon emulsion or silicone modified resin emulsion with better weather resistance, but the production cost of this coating is relatively high, the price is expensive, and the construction conditions are relatively high.
Moreover, this kind of coating is mostly only used for architectural coatings, and it is rarely used in industry.

Method used

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Examples

Experimental program
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Effect test

manufacture example 1

[0076] 34.5 parts of ion-exchanged water and 0.3 parts of an emulsifier (trade name "Pelex SS-H", manufactured by Kao Corporation, sodium alkyl diphenyl ether sulfonate) were charged into a device equipped with a dropping funnel, a thermometer, a nitrogen gas introduction tube, A detachable flask with a reflux condenser and a stirrer was heated to 80°C under a nitrogen atmosphere. After adding 0.6 parts of dodecyl mercaptan to a monomer mixture consisting of 15 parts of styrene, 41.1 parts of 2-ethylhexyl acrylate, 42.0 parts of methyl methacrylate and 1.9 parts of acrylic acid, add 1.2 parts of "Pelex SS-H" was melt|dissolved in the emulsifier aqueous solution obtained by 50 parts of ion-exchange water, it emulsified using the mixer, and the pre-emulsion was obtained. Dissolve 0.3 parts of ammonium persulfate in 13 parts of ion-exchanged water to obtain an aqueous initiator solution. Using different dropping funnels, the above-mentioned pre-emulsion and aqueous initiator solu...

manufacture example 2

[0078] In Production Example 1, a monomer mixture composed of 15 parts of styrene, 41.1 parts of 2-ethylhexyl acrylate, 33.6 parts of methyl methacrylate and 10.3 parts of acrylic acid was used. The same operation as Example 1 was used to prepare a carboxyl-containing aqueous acrylic resin emulsion (A-2) with an acid value of 80 mgKOH / g, a glass transition temperature of 5° C., and a solid content of 50%.

[0079] Modification of carboxy-containing modified starch (B)

[0080] Adjustment of starch molecular weight

[0081]According to the following method, the raw material starch used for the synthesis|combination of modified starch is acid-treated as needed, and molecular weight adjustment is performed. Suspend the raw starch in water to prepare a slurry with a concentration of 40%. This was kept at about 50° C., and a predetermined amount of hydrochloric acid was added to the above slurry while stirring. After the addition of the above-mentioned hydrochloric acid was star...

manufacture example 3

[0083] Suspend acid-treated cornstarch with a weight-average molecular weight of about 800,000 in water to prepare a 35% slurry. The slurry was heated while stirring in a thermostat set at 30° C., and the pH was adjusted to 8.5 using sodium hydroxide. While maintaining the pH at 8.0 to 8.5, succinic anhydride was added in an amount of 6% to the above-mentioned cornstarch over about 30 minutes, and after the addition was completed, the reaction was continued for 5 minutes. Then, use hydrochloric acid to neutralize the reaction solution, and then suspend it in a concentration of 50% ethanol solution, dehydrate, wash, and dry, thus making carboxyl-containing modified starch (B- 1).

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Abstract

The invention relates to a water paint composition, containing carboxyl-containing water-base resin, carboxyl-containing modified starch, a curing agent having a functional group for carrying out curing reaction with carboxyl, an adhesion conditioning agent and titanium oxide particles. The water paint composition provided by the invention has the advantages of excellent coating performances, such as biodegradability, water tolerance, alkali resistance, wear resistance, weather fastness, wide range of strippable temperature, and high strippability.

Description

technical field [0001] The invention relates to a water-based coating composition, in particular to a water-based coating composition comprising carboxyl-containing water-based resin, carboxyl-containing modified starch, a curing agent having a functional group that reacts with carboxyl groups, an adhesion modifier and titanium dioxide particles thing. Background technique [0002] In recent years, from the viewpoint of environmental problems, the transition from organic solvent-based paints to water-based paints has been progressing. In addition, coatings are generally required to have excellent coating properties such as water resistance, alkali resistance, abrasion resistance, and weather resistance. [0003] On the other hand, from the viewpoint of further reducing the load on the environment, biodegradable materials have been used as raw materials for paints in recent years. In addition, from the viewpoint of depetroleumization, it is attractive to balance the emissio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/00C09D167/00C09D175/04C09D103/04C09D133/12C09D133/08C09D103/06C09D103/08C09D103/10C09D7/12
Inventor 梅长林张国胜胡兰
Owner ANHUI JINDUN PAINT
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