Powder coating composition, powder coating, and coated article

A powder coating and composition technology, which is applied in powder coatings, devices for coating liquid on surfaces, coatings, etc., can solve problems such as poor weather resistance of coating films, and achieve the effect of excellent surface smoothness

Inactive Publication Date: 2017-08-29
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the weather resistance of the coating film formed from powder coatings made of these materials is poor

Method used

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  • Powder coating composition, powder coating, and coated article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0260]Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not limited to these Examples.

[0261] In addition, in the following examples, examples 1-4 are examples, and examples 5-8 are comparative examples.

[0262] [various measurement methods]

[0263] (Copolymerization composition of fluoropolymer (A))

[0264] pass 1 H-NMR and 13 Calculated by C-NMR.

[0265] (melt viscosity)

[0266] The melt viscosity at 190° C. is a value measured on the following conditions using a rotational rheometer (manufactured by Anton Paar JAPAN, Rheometer MCR302).

[0267] Temperature: from 130°C to 200°C, measure the melt viscosity at 190°C

[0268] Heating rate: 10°C / min

[0269] Frequency: 1Hz

[0270] (glass transition temperature (Tg))

[0271] The glass transition temperature (Tg) is a value measured by a differential calorimeter (DSC).

[0272] (number average molecular weight (Mn))

[0273] The number average molecular we...

manufacture example 1

[0274] [Production Example 1: Production of Fluoropolymer (A-1)]

[0275] 210.7 g of cyclohexyl vinyl ether (CHVE), 282.1 g of hydroxybutyl vinyl ether (HBVE), 122.0 g of ethyl vinyl ether (EVE), xylene 647.2 g, 168.8 g of ethanol, 11.0 g of potassium carbonate, 7.0 g of a 50% by mass xylene solution of tert-butyl peroxypivalate (PBPV), and 680.0 g of chlorotrifluoroethylene (CTFE). Then, the temperature was raised slowly, and after reaching 55° C., it was maintained for 20 hours. Then the temperature was raised to 65°C and kept for 5 hours. Then, it was cooled and filtered to remove the residue to obtain a xylene solution of the fluoropolymer (A-1).

[0276] Thin-film evaporation was performed on the obtained xylene solution, and it dried until the solid content concentration became 99.5 mass %.

[0277] The copolymer composition of the dried fluoropolymer (A-1) thus obtained was CTFE unit / HBVE unit / CHVE unit / EVE unit=50 / 20 / 15 / 15 (mol %). In addition, the glass transition...

manufacture example 2

[0278] [Production Example 2: Production of Fluoropolymer (A-2)]

[0279] 104.0 g of tert-butyl vinyl ether (t-BuVE), 132.0 g of hydroxybutyl vinyl ether (HBVE), and 385.0 g of vinyl pivalate (VPV) were introduced into a stainless steel autoclave with a stirrer with an inner volume of 2500 mL. g, 555.0 g of xylene, 157.0 g of ethanol, 11.0 g of potassium carbonate, 7.0 g of a 50% by mass xylene solution of tert-butyl peroxypivalate (PBPV), and 630.0 g of chlorotrifluoroethylene (CTFE). Then, the temperature was raised slowly, and after reaching 55° C., it was maintained for 20 hours. Then the temperature was raised to 65°C and kept for 5 hours. Then, it was cooled and filtered to remove the residue to obtain a xylene solution of the fluoropolymer (A-2).

[0280] Thin-film evaporation was performed on the obtained xylene solution, and it dried until the solid content concentration became 99.5 mass %.

[0281] The copolymer composition of the dried fluoropolymer (A-2) thus ob...

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Abstract

The present invention provides: a powder coating composition with which a coating film that does not have appearance defects such as bumps and cissing and has excellent surface smoothness can be formed; a powder coating that uses said powder coating composition; and a coated article that has a coating film formed by the powder coating. Provided is a powder coating composition including a fluorine-containing polymer, which has a fluoro-olefin-derived unit and of which the melt viscosity at 190 DEG C measured using a rotary rheometer at a heating rate of 10 DEG C / minute is in the range of 0.1-25 Pa*s, and fine particles, which comprise at least one selected from silica, alumina, titania, and zinc oxide, have a specific surface area of 10-500 m<2> / g, and have an average primary particle size in the range of 0.1-100 nm, and containing 0.01-10 parts by mass of fine particles relative to 100 parts by mass of the fluorine-containing polymer.

Description

technical field [0001] The present invention relates to a composition for powder coatings, a powder coating and a coated article using the composition. Background technique [0002] In recent years, global-scale environmental damage such as global warming, ozone depletion, and acid rain has become an international issue. The urgent task is to countermeasure against global environmental pollution. Currently, from the viewpoint of environmental protection, various emission standards are enforced in each country. Among them, since the emission of organic solvents (VOCs) into the atmosphere is a serious problem, de-organic solvents (de-VOCs) are being developed in various fields under the strengthening of VOC emission standards. [0003] In the past, VOCs were used in paints. Against the background of the above situation, powder paints with extremely low environmental loads have been widely used. These powder paints do not contain VOCs at all, do not require exhaust gas treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D127/12B05D7/24C09D5/03C09D7/12
CPCB05D7/24B05D1/06C09D5/033B05D2202/25C09D7/62C09D5/03C09D7/67C08K3/36C08K2003/2227C08K2003/2241C08K2003/2296C09D127/12C08K3/22C09D7/40C09D7/68C08K2201/005
Inventor 斋藤俊相川将崇
Owner ASAHI GLASS CO LTD
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