Thermosetting fluorine-carbon resin for metal coiled material and coating thereof

Abstract

The invention relates to a thermosetting fluorocarbon resin and the coating thereof. The copolymerization chain segment of the resin comprises chlorotrifluoroethylene of 45.0-55.0mol percent, vinyl-acetic ester of 28.0-37.0mol percent, vinyl versatate of 4.0-10.0mol percent, hydroxyl vinyl ether of 10.0-14.0mol percent and aliphatic olefine acid of 0-0.6mol percent. The fluorocarbon coating mainly comprises the following components with certain weight percentage, thermosetting fluorocarbon resin of 20.0-40.0 percent, cross-linking agent of 0-15.0 percent, paint of 0-35.0 percent, promoter of 0.15-1.5 percent and mixed solvent of 30.0-60.0 percent. The fluorocarbon coating adopts no acid catalyst, has stable properties in storage, has excellent softness, methyl ethyl ketone wiping resistance and aging resistance, etc., and is applicable for rolling coating of metal rolling material.

Description

technical field [0001] The invention relates to a thermosetting fluorocarbon resin and its paint, in particular to a thermosetting fluorocarbon resin and its paint for metal coils, especially suitable for roller coating of metal coils, such as steel coils or aluminum coils. Background technique [0002] The pre-coating of metals such as steel and aluminum is a known technology. Steel and aluminum coils are called steel coils and aluminum coils. They are quickly coated by roller coating, which improves the coating efficiency and facilitates subsequent cutting and forming processes. , Widely used in workpieces in construction, home appliances, automobiles and other industries. [0003] The industrial coil coating coating line has a fast line speed and can be used for continuous production. Coil coatings are pre-treated before coating, such as degreasing, passivation, washing, drying, etc., and the coating is applied to the coil by two or three rolls. On the material, quickly ...

AI Technical Summary

Problems solved by technology

The synthetic raw materials used in this resin - hydroxybutyl vinyl ether and cyclohexyl vinyl ether, are not only costly, but also difficult to obtain

At the same time, it is necessary to use a raw material that is not easy to obtain - acid anhydride, and esterify with some hydroxyl groups to ensure the storage stability of the resin. The synthesis process of the resin is complicated and uneconomical

Thereby the cost of the fluorocarbon coating for coils prepared by this resin is much higher than that of PVDF coating, and the weather resistance of the fluorocarbon coating described in this patent is not good enough (artificial accelerated aging QUV test 2000h, gloss retention rate 80%), obviously Can not meet the weather resistance requirements of external building materials

[0008] Chinese patents CN1073606C and CN1276399A disclose a kind of chlorotrifluoroethylene as the main body of four or multi-polymer copolymers as the coating of the main film-forming resin, the resin used in the coating consists of chlorotrifluoroethylene (A), fatty acid vinyl ester and / or Or isomerized olefin (B), aliphatic enol, hydroxyalkyl enoate and / or alkenyl glycol ether (C) and aliphatic enoic acid (D) are copolymerized from these four types of monomers, due to the The relative molecular mass of the resin is small, the viscosity of the resin is low, and the alignment effect of the aluminum powder pigment is poor, so it is not suitable for the preparation of metal flash paint (containing aluminum powder pigment) for metal coils

[0016] In addition, when this patent uses amino resin as a crosslinking agent to cure, a strong acid catalyst must be introduced, which will inevitably have an adverse effect on the storage stability and construction safety of the coating.