Tetrafluoroethylene copolymer resin for coating and preparation method thereof

Abstract

The invention discloses tetrafluoroethylene copolymer resin for coating and a preparation method thereof. The tetrafluoroethylene copolymer resin is prepared from the following components in mol fractions: 40-55mol% of tetrafluoroethylene, 10-44.9mol% of C1-5 vinyl carboxylate, 10-44.9mol% of C9-18 vinyl carboxylate, 5-15mol% of non-carbamido hydroxyl containing monomer, 0.1-2mol% of allyl carbamido monomer, 0-2.5%mol% of carboxylic monomer and 0-10mol% of other monomers, wherein the C1-5 vinyl carboxylate is composed of C1-2 vinyl carboxylate and C4-5 branched vinyl carboxylate of which the mol ratio is 1:(0.1-10). The tetrafluoroethylene copolymer resin for coating disclosed by the invention has a good dispersion wetting property with a pigment, has good consistency with a curing agent and can be dissolved in a pure petroleum based solvent, coating prepared from the tetrafluoroethylene copolymer resin has good weather resistance and solvent resistance and is not easy to produce yellow stain, and the tetrafluoroethylene copolymer resin is not easy to crack or flake when used for surface coating of a fiber substrate.

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...

AI Technical Summary

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

Images