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Epoxy resin-based coating composition

A technology of epoxy resin coating and epoxy resin, applied in the direction of epoxy resin coating, polyamide coating, coating, etc., can solve the problems of irritating odor of curing assistant, complicated operation, etc., and achieve excellent curability and operability. Excellent, suitable service life effect

Active Publication Date: 2012-05-09
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Japanese Patent Laid-Open Publication No. 8-176500 (Patent Document 3) discloses a method of coating a rapidly curable coating composition that is cured by coating a composition containing an epoxy compound and a polymercapto compound in a specific ratio, However, Patent Document 3 has no description about the compound (P) having a branched thiol group involved in the present invention.
In addition, in the coating method described in Patent Document 3, it is necessary to apply a curing catalyst such as a secondary amine or a tertiary amine on the substrate in the form of mist or vapor, so the operation is cumbersome, and there are pungent odors from the curing aid, etc. Problems in the operating environment

Method used

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  • Epoxy resin-based coating composition
  • Epoxy resin-based coating composition
  • Epoxy resin-based coating composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0141] Mix 30 parts of liquid A containing epoxy resin and compound (P) with a branched thiol group prepared in preparation example A1, and 4 parts of liquid B containing curing auxiliary agent prepared in preparation example B1 to obtain a ring Oxygen resin coating composition. This composition was coated on the polished steel plate using ANEST IWATA Co., Ltd. EASPRE-W-101. Adjust the air flow and valve opening during coating so that the film thickness after drying is about 30 microns. After coating, it was dried and cured at 25°C. As a result, it took 1 hour until the coating film was touched without leaving fingerprints (finger-touch drying time), and a good coating film was obtained.

Embodiment 2

[0143]Use A2 that has reduced the amount of the compound (P) with branched chain thiol groups in A liquid and 10 parts of B2 liquid that added polyamide amine curing agent in B liquid, in addition, by and embodiment 1 The same operation is carried out for coating, drying and curing. The dry-to-touch time was 4 hours, and a good coating film was obtained.

Embodiment 3～4

[0145] Coating, drying, and curing were performed in the same manner as in Examples 1 and 2, except that drying and curing were performed at 5°C. The dry-to-touch time was 5 to 10 hours, and it can be seen that it cured in a short time even at a low temperature.

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PUM

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Abstract

An epoxy resin-based coating composition which comprises, at least, an epoxy resin, a thiol-type curing agent, and a curing assistant, characterized by consisting of two liquids to be mixed just before using, namely, a liquid (A) containing an epoxy resin and a thiol-type curing agent and a liquid (B) containing a curing assistant, said thiol-type curing agent containing a branched thiol compound (P) that is an ester of a polyhydric alcohol with a thiol group-containing carboxylic acid represented by general formula (1): HOCO(CH2)nCR1R2SH (wherein R1 is a hydrogen atom or a linear or branched alkyl group having 1 to 10 carbon atoms; R2 is a linear or branched alkyl group having 1 to 10 carbon atoms; and n is an integer of 1 to 4). The epoxy resin-based coating composition exhibits a suitable pot life, excellent curability particularly at low and ordinary temperatures, and low toxicity.

Description

technical field [0001] The present invention relates to a two-liquid curing type epoxy resin coating composition prepared by mixing two liquids having good storage stability just before use, and the epoxy resin coating composition has a suitable service life, especially It is excellent in curability at low temperature and normal temperature. More specifically, the present invention relates to an epoxy resin coating composition prepared by mixing two liquids, A liquid and B liquid, wherein the A liquid contains epoxy resin and a specific mercaptan curing agent, and the B liquid The liquid contains curing aids. Background technique [0002] Conventionally, epoxy resin coatings excellent in curability at room temperature have been used for coating large structures that cannot be heat-cured, such as ships, bridges, industrial equipment, roads, floors, and the like. [0003] In addition, as a coating composition that can be cured in winter or in cold regions, a coating composit...

Claims

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Application Information

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IPC IPC(8): C08G59/66C09D7/12C09D163/00C09D177/00C09D179/02
CPCC09D7/001C08G59/66C09D163/00C08G59/50C09D7/20C09D177/00
Inventor 山上功竹中宽辉室伏克己
Owner SHOWA DENKO KK
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