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thermosetting coating composition

A composition and thermosetting technology, applied in polyurea/polyurethane coatings, coatings, etc.

Active Publication Date: 2021-07-06
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, catalysts other than organotin compounds are needed because despite their high catalytic performance, the toxicity of organotin compounds has become a problem in recent years

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture Embodiment 1

[0192] Manufacturing example 1 (acrylic resin)

[0193] Into a four-necked flask equipped with a stirrer, a thermometer, a cooling tube, and a nitrogen inlet, 31 parts of propylene glycol monomethyl ether was charged, and the temperature therein was raised to 110° C. while introducing nitrogen. After the temperature reached 110°C, the introduction of nitrogen was stopped, and 2 parts of 2-hydroxyethyl acrylate, 30 parts of methyl methacrylate, 22 parts of 2-ethylhexyl acrylate, 25 parts of styrene, A mixture of 1 part acrylic acid and 4 parts 2,2'-azobis(isobutyronitrile). Then, the mixture was aged at 110° C. for 2 hours while introducing nitrogen, and then cooled to 100° C. and diluted with propylene glycol monomethyl ether, thereby obtaining an acrylic resin (A-1) solution having a solid content of 60%. .

[0194] Acrylic resin (A-1) had a weight average molecular weight of 15,000 and a hydroxyl value of 106 mg KOH / g.

manufacture Embodiment 2

[0195] Manufacturing example 2 (epoxy resin)

[0196] In a flask equipped with a stirrer, a thermometer, a nitrogen inlet tube and a reflux condenser, 950 parts of jER1001 (trade name, produced by Mitsubishi Chemical Corporation, epoxy resin, epoxy equivalent 475, number average molecular weight 900), 236 parts of 1 , 6-hexanediol and 0.2 g of dimethylbenzylamine, and the mixture was reacted with each other at 200° C. until the epoxy equivalent became 30,000 or more, and ethylene glycol monobutyl ether was further added to the flask, An epoxy resin (A-2) having a solid content of 60% was thus obtained. The number average molecular weight of the epoxy resin (A-2) was 2,500.

[0197] Production of blocked polyisocyanate curing agent (B)

manufacture Embodiment 3

[0199] Into a four-necked flask equipped with a stirrer, a heating device, a cooling device and a decompression device, 272 parts of hexamethylene diisocyanate and 214 parts of methyl ethyl ketone were added, followed by heating to 60°C. Then 169 parts of methyl ethyl ketone oxime were gradually added to the four-necked flask over 1 hour while stirring. Thereafter, the mixture was allowed to react at 60°C for 2 hours, and then 59 parts of trimethylolpropane was gradually added thereto so that the temperature did not reach 70°C or more. With stirring, the reaction mixture was allowed to react at 60° C. until no free isocyanate groups were detected by infrared spectroscopy. After the reaction was completed, a blocked polyisocyanate curing agent (B-1) having a solid content of 70% was obtained. The NCO amount of the obtained blocked polyisocyanate curing agent (B-1) was 16.4%.

[0200] Production of amine compound (C)

[0201] Among the amine compounds (C-1) to (C-16) shown in...

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Abstract

The present invention provides a blocked polyisocyanate type thermosetting paint composition which exhibits paint stability and effect as if using a catalyst without using a metal catalyst. The thermosetting coating composition according to the present invention contains a hydroxyl group-containing resin (A), a blocked polyisocyanate curing agent (B) and an amine compound (C) represented by formula (1). [In formula (1), R 1 to R 5 each independently being a hydrogen atom or an organic group having at least one carbon, wherein the organic group may contain at least one atom selected from an oxygen atom, a nitrogen atom, a sulfur atom and a halogen atom]

Description

technical field [0001] The present invention relates to a thermosetting coating composition excellent in coating curability and coating appearance despite substantially containing no metal catalyst, and a coated article obtained by applying the coating composition. Background technique [0002] Isocyanate curing agents are commonly used as curing agents for coating compositions. However, isocyanate curing agents are hardly used in one-pack coating compositions obtained by premixing a resin having active hydrogen with a polyisocyanate curing agent because the reaction between isocyanate groups and active hydrogen proceeds even at room temperature. Therefore, a method of using a blocked isocyanate that is inactive at room temperature by reacting a polyisocyanate with an active hydrogen group-containing compound (blocking agent) has been put into practical use. [0003] Blocked isocyanates do not react with resins at room temperature. However, when the blocked isocyanate is h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C08G18/65C08G18/80C09D201/06
CPCC09D175/04C09D201/06C08G18/672C08G18/6407C08G18/73C08G18/8077C08G18/1858C08G18/80C08K5/31C08K5/36C08G18/65
Inventor 权谷晴之山下文男岩井贵司
Owner KANSAI PAINT CO LTD
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