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Coating composition containing polyamide-imide resin

a technology of polyamideimide resin and coating composition, which is applied in the direction of coatings, lubricant compositions, additives, etc., can solve the problems of reproductive toxicity of amide-based solvents and diminish the lubrication durability of products treated therewith, and achieve excellent lubrication durability

Inactive Publication Date: 2015-06-18
DOW CORNING TORAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a coating composition that contains a polyamide-imide resin without using an amide-based solvent. This results in excellent lubrication durability.

Problems solved by technology

However, there is a concern that amide-based solvents have reproductive toxicity, and there is a trend to regulate the use thereof primarily in Europe.
However, when a polyamide-imide resin composition using γ-butyrolactone as a solvent is used as a binder for a lubricant in that the lubrication durability on a product treated therewith is diminished in comparison to cases in which amide-based solvents are used.

Method used

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  • Coating composition containing polyamide-imide resin
  • Coating composition containing polyamide-imide resin
  • Coating composition containing polyamide-imide resin

Examples

Experimental program
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Effect test

example 1

Practical Example 1

[0045]Powdered graphite was added to a polyamide-imide resin solution (produced by Hitachi Chemical Co., Ltd., solid content: approximately 30% by mass) containing a polyamide-imide resin dissolved in 1,3-dimethyl-2-imidazolidinone (DMI) prepared in DMI, so that the content of the powdered graphite was 50 parts by mass per 100 parts by mass of the polyamide-imide resin, and mixed at room temperature. This mixture was diluted using DMI so that the solid content concentration was 15% by mass to form a coating composition to be used in evaluation tests.

reference example 1

[0048]A polyamide-imide resin solution (produced by Hitachi Chemical Co., Ltd., HPC-5000) in which a polyamide-imide resin was dissolved in N-methylpyrrolidone (NMP) was used, and powdered graphite was added, so that the content of the powdered graphite was 50 parts by mass per 100 parts by mass of the polyamide-imide resin, and mixed at room temperature. This mixture was diluted using NMP so that the solid content concentration was 15% by mass to form a coating composition to be used in evaluation tests.

Coating Method

[0049]The resulting coating composition was spray-coated onto a test piece (ring) subjected to sandblasting treatment in advance. After the test piece was dried for 10 minutes at 80° C., the test piece was baked for 30 minutes at 240° C. to obtain a test piece for testing.

Evaluation Method

[0050]Sliding tests were performed under the following conditions using a block-on-ring tester (LFW-1 tester), and the number of cycles until the coefficient of friction increased sub...

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Abstract

A coating composition comprises: (a) a resin solution containing a polyamide-imide resin and a solvent having a urea bond; and (b) a powdered solid lubricant. In general, the coating composition containing a polyamide-imide resin does not raise any concern about reproductive toxicity and has excellent lubrication durability.

Description

TECHNICAL FIELD[0001]The present invention relates to a coating composition containing a polyamide-imide resin.[0002]Priority is claimed on Japanese Patent Application No. 2012-172050, filed on Aug. 2, 2012, the content of which is incorporated herein by reference.BACKGROUND ART[0003]Polyamide-imide resins are resin materials exhibiting excellent heat resistance and mechanical strength. Polyamide-imide resins are therefore used as binder components for coating compositions having lubricating properties.[0004]Conventionally, polyamide-imide resins have been synthesized using amide-based solvents such as N-methylpyrrolidone (NMP), N-ethylpyrrolidone (NEP), N,N-dimethylacetamide, and N,N-dimethylformamide. This is because amide-based solvents have excellent polyamide-imide resin solubility as well as excellent handleability as solvents.[0005]However, there is a concern that amide-based solvents have reproductive toxicity, and there is a trend to regulate the use thereof primarily in Eu...

Claims

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Application Information

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IPC IPC(8): C10M149/18C10M125/02C10M133/44
CPCC10M149/18C10M125/02C10M133/44C09D7/65C09D7/61C09D7/20C09D179/08C09D133/24C08K5/37C08L79/08
Inventor YAMAGUCHI, TETSUJIYAMASHITA, JIRO
Owner DOW CORNING TORAY CO LTD
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