A kind of tetrafluoroethylene copolymer resin for coating and preparation method thereof

Abstract

The invention discloses a tetrafluoroethylene copolymer resin for coatings and a preparation method thereof. The resin comprises: 40-55mol% of tetrafluoroethylene, C 1～5 Carboxylic acid vinyl ester 10 ~ 44.9mol%, C 9～18 Carboxylic acid vinyl ester 10-44.9mol%, non-urea group hydroxyl-containing monomer 5-15mol%, allyl urea-based monomer 0.1-2mol%, carboxylic acid monomer 0-2.5mol%, other monomers 0-2 10mol%, C 1～5 The vinyl carboxylate is composed of C 1～2 vinyl carboxylate and C 4～5 It is composed of branched chain carboxylate vinyl ester, and the molar ratio of the two is 1:0.1~10. The tetrafluoroethylene copolymer resin for coatings of the present invention has good dispersion and wettability with pigments, good compatibility with curing agents, can be dissolved in pure petroleum solvents, and the coatings prepared by tetrafluoroethylene copolymer resins have good weather resistance and solvent resistance. It has excellent properties and is not easy to produce yellowing. When tetrafluoroethylene copolymer resin is used for the surface coating of fiber substrates, it is not easy to crack and peel off.

Description

technical field [0001] The invention relates to a tetrafluoroethylene copolymer resin for coatings and a preparation method thereof, belonging to the technical field of fluorine-containing FEVE coatings. Background technique [0002] Fluorine-containing copolymers have high C-F bond energy and low molecular polarity, so they have good weather resistance, chemical resistance, water and oil repellency, and stain resistance, and are widely used. However, most fluorine-containing polymers have high crystallinity and are difficult to dissolve in solvents. Through the copolymerization technology, monomer units of hydrocarbon structure are introduced into the polymer, which destroys the regularity of the molecular chain of the fluorine-containing polymer, reduces its crystallinity, and dissolves in the solvent. [0003] In the 1970s, DuPont of the United States developed a random copolymer of vinylidene fluoride as the main body, tetrafluoroethylene and vinyl butyrate, which can b...

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Problems solved by technology

Chinese patent CN200310109383.8 announced that it contains 45-60 mol% tetrafluoroethylene segment, 10-35 mol% alkyl vinyl ether segment, 15-22 mol% hydroxyalkyl vinyl ether segment and 3-20 mol% alkanoic acid vinyl Soluble fluorine-containing coating resin with ester segment, but the compatibility of the copolymer with curing agent, dispersant, etc. is reduced, and the dispersion and wettability of the pigment is not ideal

[0006] Chinese patent 99113196.7 discloses a multi-polymer coating resin of tetrafluoroethylene-aliphatic ester and / or isomeric olefin-fatty enol and / or enyl ether diol-fatty acid, and the compatibility of the resin and acrylic resin is improved , the dispersion and wettability of pigments is improved; but due to the tendency of aliphatic esters to self-polymerize, it is difficult to increase the fluorine content of the copolymer, and the coating performance is reduced, especially the solvent resistance.

However, the dispersion and wettability of the copolymer resin to the pigment is still not ideal, and the uniformity of mixing with the curing agent also needs to be further improved; when used as a surface coating on a fiber substrate, cracking, peeling, etc. are prone to occur

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