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Method for manufacturing powder coating material, coated article and method for manufacturing same, and method for manufacturing carboxyl-group-containing fluororesin

A technology of powder coating and manufacturing method, which is applied in the direction of powder coating, polyester coating, epoxy resin coating, etc., can solve the problem of poor weather resistance of cured film, and achieve the effect of excellent weather resistance

Inactive Publication Date: 2016-03-30
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the cured films formed using these powder coatings have the disadvantage of poor weather resistance

Method used

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  • Method for manufacturing powder coating material, coated article and method for manufacturing same, and method for manufacturing carboxyl-group-containing fluororesin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0330] Hereinafter, examples and comparative examples are shown to describe the present invention in detail. However, the present invention is not limited to these. Examples 1-7 are examples, and Example 8 is a comparative example.

[0331] [measurement method, evaluation method]

[0332] (glass transition temperature)

[0333] Glass transition temperature is the midpoint glass transition temperature determined by differential scanning calorimetry (DSC) method.

[0334] (molecular weight)

[0335] The number average molecular weight and the mass average molecular weight are values ​​obtained in terms of polystyrene by gel permeation chromatography (GPC) method.

[0336] (The average particle size)

[0337] The average particle size of the powder is measured using a laser diffraction particle size distribution analyzer (manufactured by Sympatec, Helos-Rodos) and obtained from the 50% average volume particle size distribution.

[0338] (Appearance of cured film)

[0339] ...

example 1～8

[0379](manufacturing of powder coatings)

[0380] The components described in Table 1 were mixed for about 10 to 30 minutes with a high-speed mixer (manufactured by Yuzaki Co., Ltd.) to obtain a powdery mixture. Using a twin-screw extruder (manufactured by ThermoPRISM, 16 mm extruder), this mixture was melt-kneaded at a cylinder set temperature of 120° C. for 2 minutes to obtain pellets. The pellets were pulverized at room temperature using a pulverizer (manufactured by FRITSCH Corporation, device name: Rotor-SpeedMill P14), and classified with a 150-mesh sieve to obtain a powder coating having an average particle diameter of about 40 μm.

[0381] In addition, for powder coatings, the infrared absorption spectrum is obtained by infrared spectroscopy. In the powder coating materials of Examples 1 to 3 and Examples 5 to 7, peaks of ester bonds and peaks of carboxyl groups accompanying the reaction of the hydroxyl group in the hydroxyl group-containing fluororesin (B) with the a...

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Abstract

Provided are: a method for manufacturing a powder coating material whereby a hardened film having excellent weather resistance and few voids (gaps) can be formed; a coated article having a hardened film having excellent weather resistance and few voids, and a method for manufacturing a coated article; and a method for manufacturing a carboxyl-group-containing fluororesin having minimal gelling. A method for manufacturing a powder coating material including a powder (X) comprising a composition ([alpha]) including a curing agent (D) and a fluororesin (A) having carboxyl groups or alkoxysilyl groups and urethane bonds, the method for manufacturing a powder coating material having (a) a step for melt-kneading a mixture including a hydroxyl-group-containing fluororesin (B), an acid anhydride (C1) or a compound (C2) having alkoxysilyl groups and isocyanate groups, and a curing agent (D), and obtaining a mixture comprising the composition ([alpha]), and (b) a step for pulverizing the mixture and obtaining a powder (X).

Description

technical field [0001] The present invention relates to a method for producing a powder paint, a coated article and a method for producing the same, and a method for producing a carboxyl group-containing fluororesin. Background technique [0002] In recent years, problems of environmental destruction on a global scale, such as global warming, ozone depletion, and acid rain, are approaching considerably. Global environmental pollution countermeasures are being called for internationally, and various regulations have begun to be implemented from the viewpoint of environmental protection. Among them, the emission of organic solvents (VOC) into the atmosphere has become a major problem, and with the trend of strengthening VOC regulations in various industries, the actions of deorganosolvation (deVOC) have become active. In the coatings industry, expectations for powder coatings as alternatives to existing organic solvent-based coatings, as environmentally friendly coatings that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D201/04C09D5/03C09D7/12C09D127/12C09D133/00C09D163/00C09D167/00C09D175/04C09D201/08C09D201/10
CPCC09D5/03C09D133/00C09D163/00C09D175/04C09D201/04C09D201/08C09D201/10C08G18/6279C08G18/718C08G18/8074C08G18/4063C08G2150/20C09D5/033C09D133/06C09D7/40C09D127/18C08K3/22C08K5/1539C08K5/29C08K2003/2241C09D5/035C09D129/10
Inventor 斋藤俊相川将崇
Owner ASAHI GLASS CO LTD
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