Aqueous paint composition

A technology for water-based coatings and compositions, applied in polyester coatings, starch derivative coatings, polyurea/polyurethane coatings, etc., can solve problems such as water resistance and other coating film performance degradation

Inactive Publication Date: 2010-03-03
NIPPON PAINT CO LTD +1
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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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0071] 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

[0073] In Production Example 1, a monomer mixture consisting 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%.

[0074] Modification of carboxy-containing modified starch (B)

[0075] Adjustment of starch molecular weight

[0076] 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 w...

manufacture example 3

[0078] 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 provides an aqueous paint composition having good coated film performance such as water resistance, alkali stability, abrasion resistance, weather resistance and the like after a biomassmaterial with the biodegradability is used. The aqueous paint composition contains (A) an aqueous resin containing carboxyl, (B) a modified starch containing carboxyl and (C) a curing agent with a functional grouping the cure reaction with carboxyl.

Description

technical field [0001] The invention relates to a water-based paint composition. 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 emission and absorption of carbon dioxide in the life cycle by using raw materials derived from biomass (especially plants), and from the viewpoint of not increasing carbon dioxide in the atmosphere. Eye-catching. For example, a curable starch composition is disclosed, which uses...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D103/04C09D133/00C09D167/00C09D175/04C09D7/12
Inventor 中村朝德池田修治佐藤弘一木村亨大泽哲哉曾根博信
Owner NIPPON PAINT CO LTD
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