Preparation method of high-performance fluorocarbon coating

Abstract

The invention relates to a preparation method of a high-performance fluorocarbon coating. The fluorocarbon coating is composed of a component A and a component B. The component A is composed of an isocyanate-capped polyol oligomer and an anhydrous diluent A, and the component B consists of fluorocarbon resin, dispersant, inorganic filler, catalysts and anhydrous diluents. The component A and the component B are mixed in accordance with the molar ratio of isocyanate to hydroxyl value being (0.6-1.5): 1 to obtain the fluorocarbon coating. The polyol oligomer contains polyester polyol and polyether polyol, endows the coating with outstanding mechanical performance, good low-temperature flexibility and hydrolysis resistance and is capped by isocyanate to be reacted with fluorocarbon resin, and soft segments formed by the polyol oligomer and the fluorocarbon resin and isocyanate hard segments are distributed regularly in the coating to form a three-dimensional network interpenetration structure. The prepared fluorocarbon coating has the advantages of ageing resistant and wind and sand resistant performance and is applicable in preparation of coating type solar cell back plates used in areas with adverse environments.

Description

technical field [0001] The invention relates to a preparation method of fluorocarbon paint, which belongs to the technical field of material surface protection. Background technique [0002] In the past ten years, the country's development in new energy, construction, machinery, automobiles, railways, etc. has driven the development of the corresponding coating industry. Through coating, the outdoor steel structure, aluminum curtain wall, wind power equipment, solar battery backplane etc. play a decorative and protective role, which can effectively resist external erosion on them and prolong their service life. The design of some large-scale and key steel structure engineering projects requires the durability of anti-corrosion coatings to reach 20 years, and the aluminum-plastic panels also require 20 years of non-fading. Fluorocarbon resin introduces fluorine element with high electronegativity and strong fluorine-carbon bond energy, which makes it have outstanding aging r...

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Problems solved by technology

[0004] Patent CN102664204A provides a new type of coated solar cell backsheet, the wear resistance of which is improved by adding epoxy resin to the fluorocarbon coating, and the good compatibility of epoxy resin and fluororesin makes the coating resistant The abrasiveness is greatly improved, but because their molecular chains are combined by physical force, the strength is not large, and the addition of epoxy resin causes serious yellowing of the coating; patent CN101792639A discloses a wear-resistant, scratch-resistant and weather-resistant polyurethane coating. It is mainly made of hydroxyester acrylic resin, fluorocarbon resin and polyester resin as the main resin, filled with various nano-inorganic fillers, and then reacted with polyisocyanate curing agent. It is suitable for surface coating of high-speed trains, buses, etc. Among them, the introduction of hydroxyacrylic acid and polyester resin will weaken the aging resistance of the coating to a certain extent. At the same time, nano-scale fillers are only filled in the resin matrix. The compatibility between the two is poor, and it is difficult to disperse in the main resin. If If the treatment is not good, it will lead to disadvantages such as cracking of the coating; patent CN104194599A discloses a fluorocarbon two-component coating with excellent performance, wherein component A is mainly composed of fluorocarbon polyurethane prepolymer, nano-inorganic fillers, etc., and component B The components are mainly composed of hydroxyl acrylic resin and isocyanate curing agent, and a high crosslink density fluorocarbon coating is obtained, which has excellent wear resistance, but its production process is relatively complicated

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