A room temperature curing polytetrafluoroethylene modified high-solid automotive varnish and preparation method thereof

Abstract

The invention provides a preparation method for a normal-temperature-cured polytetrafluoroethylene-modified high-solid-content automobile varnish. The preparation method is characterized by comprising a step of mixing main paint, a curing agent and a diluent according to a mass ratio of 100: 50: (10-15), wherein the main paint is prepared by mixing 40 to 59 parts of mixing monomer, 1 to 5 parts of an initiator and 40 to 60 parts of a mixed solvent under stirring in the presence of nitrogen and then adding 3 to 5 parts of modified transparent oily polytetrafluoroethylene resin drop by drop; the curing agent is prepared by mixing 50 to 60 parts of polyisocyanate, 30 to 40 parts of butyl acetate and 10 to 20 parts of propylene glycol methyl ether acetate; and the diluent is prepared by mixing 50 to 60 parts of butyl acetate with 40 to 50 parts of propylene glycol methyl ether acetate. According to the invention, the liquid polytetrafluoroethylene resin prepared on the basis of independent research and development is added into hydroxyl-acrylic resin, so the prepared automobile varnish has the excellent properties of super self-cleanness, high hardness, super smoothness, weatherability, etc.

Description

technical field [0001] The invention relates to a high-molecular polymer automotive coating, especially an automotive varnish and a preparation method thereof, in particular to a polytetrafluoroethylene modified high-solid automotive varnish cured at room temperature and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) is commonly known as Teflon, and has the reputation of "super-weather-resistant and anti-corrosion king". It is the highest-end material for fluorine products at present. Electrical properties, chemical resistance, high and low temperature resistance, lubricity, non-stickiness, weather resistance, non-hygroscopicity and other properties, so it is widely used in electrical and electronic insulation, chemical industry, machinery, aviation, aerospace, construction, transportation, textiles , medical vehicle shipbuilding and various industrial fields. "TEFLON" series products all need to be cured under high temperature co...

AI Technical Summary

Problems solved by technology

However, due to the existence of ether bonds, the paint has poor storage stability and poor dispersion. Most domestic manufacturers use this resin to synthesize room temperature curing fluorocarbon paint. The paint film is soft, low hardness, white turbidity, poor dispersion, and easy to pollute.

[0005] At present, the research on fluorine-containing coatings cured at room temperature focuses on the blending of fluorine-containing monomers and acrylic monomers. Zhong Ping’s research on fluorine-containing acrylic polyurethane coatings uses methyl methacrylate, butyl acrylate, and hydroxypropyl acrylate. Fluorine-containing acrylic resin is obtained by copolymerization of esters and fluorine-containing monomers, and then solvents and additives are added to make fluorine-containing coatings. Although they have a large contact angle and certain weather resistance, they are not suitable for automotive coatings because Does not have the properties of ultra-smooth and high hardness

[0006] Invention patent——A hydroxyacrylic resin for ultra-fast-drying automotive varnish and its preparation method introduces a car varnish that cures and dries quickly at room temperature. Although it has the excellent performance of quick-drying at room temperature for 15-20 minutes, it uses xylene , trimethylbenzene and other highly toxic solvents, and do not have a certain hardness, wear resistance, weather resistance

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