Fluororesin powder liquid dispersion capable of forming thick coatings

A technology of liquid dispersion and liquid dispersion medium, used in coatings, anti-corrosion coatings, etc., can solve problems such as explosions and working environment restrictions

Inactive Publication Date: 2001-07-04
DUPONT MITSUI FLUOROCHEMICALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the flammability of the organic liquid in the dispersion, there is a danger of explosion, so that the working environment is restricted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and 2

[0070] The heated flowable fluororesin powder PFA, liquid dispersion medium, fibrous filler carbon fiber and 2% by weight PPS foam suppressor are mixed by the consumption shown in Table III, and the liquid dispersion medium is the mixture of ethanol, tert-butyl alcohol and ethylene glycol Liquid mixtures having a surface tension of 45 dynes / cm or less.

[0071] Then, water and a 2% by weight PES colloidal solution were added to the obtained mixture to form a fluorinated resin powder liquid dispersion.

[0072] This fluororesin powder liquid dispersion was coated on a SUS plate by the coating method (2-a), and then sintered according to the temperature program shown in Table IA. The properties of the coatings were evaluated and the results are listed in Table III.

Embodiment 3

[0074] Prepare the fluororesin powder liquid dispersion by the same method as in Example 2, but replace the carbon fiber in Example 2 with glass fiber as the fibrous filler, and change the consumption of PFA powder to 19.4g. The composition is listed in Table III.

[0075] In the same manner as in Example 2, the liquid dispersion of fluororesin powder was coated on a SUS plate and sintered to form a film. The properties of the coatings were evaluated and the results are listed in Table III.

Embodiment 4

[0077] Prepare the fluororesin powder liquid dispersion by the same method as in Example 2, but in addition to the glass fibers used in Example 2, also add 10% by weight of PEEK in the amount shown in Table III, and the PFA powder The dosage was changed to 16.4g.

[0078] In the same manner as in Example 2, the liquid dispersion of fluororesin powder was coated on a SUS plate and sintered to form a film. The properties of the coatings were evaluated and the results are listed in Table III.

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Abstract

A fluororesin powder liquid dispersion comprising heat-flowable fluororesin powder, liquid dispersion medium having a surface tension of not more than 45 dyne / cm, and colloidal particles having an average particle size of not more than 1 [mu]m provides thick corrosion resistant coated films. Preferred colloidal particles for the dispersion are particles of polyether sulfone (PES) which are added in an aqueous dispersion containing an organic solvent and a water-miscible solvent. An aqueous dispersion of PES colloidal particles having an average particle size of not more than 1 [mu]m is preferably prepared by (1) dissolving PES in an organic solvent capable of solubilizing PES; (2) combining the dissolved PES with a water-miscible solvent which is capable of being dissolved in the organic solvent; and (3) combining water in which there is a dissolved surfactant with the dissolved PES.

Description

field of invention [0001] The present invention relates to a liquid dispersion of fluororesin powder suitable for coating articles, in particular to a liquid dispersion of fluororesin powder which does not cause irreversible aggregation and can form a very thick coating. Background of the invention [0002] Heat-flowable fluororesins, which have properties such as chemical resistance, non-stickiness, heat resistance, low coefficient of friction, and electrical insulation, also form pinhole-free films and are therefore suitable for use as coatings. Heat-flowable fluororesins used in such coating applications include, for example, copolymers of tetrafluoroethylene and perfluoro(alkyl vinyl ether) (hereinafter referred to as PFA), copolymers of tetrafluoroethylene and hexafluoropropylene (FEP) and copolymers of tetrafluoroethylene and ethylene (ETFE). These resins are insoluble in water and organic solvents, so they cannot be used as solution coatings. Accordi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G75/23C08J3/02C09D7/12C09D127/00C09D127/12
CPCC08K3/22C08L81/06C09D5/08C09D7/20C09D7/61C09D7/65C09D127/18
Inventor 齐藤卓三
Owner DUPONT MITSUI FLUOROCHEMICALS CO LTD
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