Water-based primer composition

A water-based primer and composition technology, applied in primers, coatings, devices for coating liquids on surfaces, etc., can solve problems such as reduced adhesion and achieve excellent solvent resistance.

Active Publication Date: 2007-07-25
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to reasons such as physical properties or cost, polyolefin molded products mostly reduce or do not add rubber components (such as styrene-butadiene rubber, isoprene rubber, etc.) or hydroxyl-containing polyolefins added in the past. Chlorinated polyolefin primers have the problem of reduced adhesion to moldings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0089] Preparation Example 1: Preparation of hydroxyl-containing acrylic emulsion

[0090] Add 144.5 parts of deionized water and 1.2 parts of "Newcol 562SF" (manufactured by Nippon Emulsifier Co., Ltd., trade name, polyoxyethylene alkylbenzene sulfonate ammonium, active ingredient 60 %), stirred and mixed in a nitrogen flow, and the temperature was raised to 80°C. Next, introduce 5.2 parts of 1% and 3% ammonium persulfate aqueous solution in the reaction vessel into the monomer emulsion (I), which is 56.2 parts of methyl Cyclohexyl acrylate, 20 parts of n-butyl acrylate, 21 parts of 2-hydroxyethyl acrylate, 2.8 parts of acrylic acid, 1.75 parts of "Newcol 707SF" (manufactured by Nippon Emulsifier Co., Ltd., trade name, surfactant, active ingredient 30% ) and 94.3 parts of monomer emulsion of deionized water. Afterwards, the remaining monomer emulsion (I) was added dropwise to the reaction vessel in 3 hours, and aged for 1 hour after the addition was completed, to obtain an ...

preparation example 2

[0091] Preparation example 2: Preparation of hydroxyl-containing acrylic resin solution

[0092] Add 40 parts of propylene glycol monomethyl ether to a reactor equipped with a stirrer, a reflux condenser and a thermometer, heat and keep it at 120°C, and add 53 parts of cyclohexyl methacrylate and 20 parts of n-butyl acrylate dropwise in 3 hours , a mixture of 21 parts of 2-hydroxyethyl acrylate, 6 parts of acrylic acid and 5 parts of azobisisobutyronitrile. After the dropwise addition, it was aged at the same temperature for 1 hour, and a mixture of 1 part of azobisdimethylvaleronitrile and 10 parts of propylene glycol monomethyl ether was added dropwise thereto for 1 hour, and after further aging for 1 hour, it was added while stirring 7.4 parts of dimethylethanolamine and 193 parts of deionized water to obtain a hydroxyl group-containing acrylic resin solution (B-2) with an acid value of 47 mg KOH / g, a hydroxyl value of 101 mg KOH / g, and a weight average molecular weight of ...

preparation example 3

[0093] Preparation Example 3: Preparation of Hydroxyl-containing Polyester Resin Solution

[0094] Add 105 parts of neopentyl glycol, 273 parts of trimethylolpropane, 320 parts of butyl ethyl propylene glycol, 219 parts of adipic acid and 385 parts of isophthalic acid into the reaction vessel, and let it react at 220°C for 6 hours Finally, add 76 parts of trimellitic anhydride and react at 170°C for 30 minutes, then add 5.5 parts of dimethylethanolamine and 120 parts of deionized water while stirring to obtain an acid value of 35 mg KOH / g and a hydroxyl value of 140 mg KOH / g . A hydroxyl-containing polyester resin solution (B-3) having a weight average molecular weight of about 5,000.

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Abstract

Provided is a water-based primer composition, which is characterized in that it comprises: (A) an aqueous dispersion of a chlorine-free modified polyolefin, the dispersion being obtained by dispersing in an aqueous medium a polyolefin (a) modified with an unsaturated carboxylic acid or an acid anhydride, the modified polyolefin (a) having a melting point of 120 DEG C or lower and a weight-average molecular weight of 50,000 to 150,000; (B) a water-soluble or water-dispersible polyol resin; and (C) a pigment, and that the ingredient (A) / ingredient (B) weight ratio is from 20 / 80 to 85 / 15 on a solid basis and the ingredient (C) is contained in an amount of 0.5-200 parts by weight per 100 parts by weight of all solid resins in the composition. Also provided is a method of coating a plastic molding with the water-based primer composition.

Description

technical field [0001] The present invention relates to a non-chlorinated water-based primer composition capable of forming a coating film excellent in adhesiveness, water resistance, solvent resistance, etc., and a method of coating plastic moldings using the composition. Background technique [0002] Molded products of polyolefins such as polyethylene and polypropylene are often used instead of metal molded products for automotive outer panel parts, home appliances, and the like. Since polyolefin is non-polar, it is generally difficult to paint or bond. Therefore, when coating the topcoat on the above-mentioned molded articles, in order to improve the adhesion between the topcoat film and the molded article, it is usually pre-coated with a Primer for polar chlorinated polyolefins. [0003] However, due to reasons such as physical properties or cost, polyolefin molded products mostly reduce or do not add rubber components (such as styrene-butadiene rubber, isoprene rubber,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D123/26B05D7/02B05D7/24C09D5/00C09D133/00C09D151/06C09D161/20C09D167/00C09D175/04C09D193/00
CPCC08G18/10C08F255/00C08F255/02C08G18/706C08G18/8093C08K3/0033C08K5/0025C08K5/0041C08L23/02C08L51/06C08L75/04C08L2314/06C09D5/002C09D123/02C09D123/147C09D151/06C09D167/00C08K3/013C08G18/62C08G18/42C08L2666/14C08L2666/02C08L2666/24C09D123/26C09D5/00C09D123/00C09D133/00
Inventor 长野利昭高桥辉好须贝英生
Owner KANSAI PAINT CO LTD
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