Ultralow-temperature curable epoxy anticorrosive coating

Abstract

The invention discloses an ultralow-temperature curable epoxy anticorrosive coating. The ultralow-temperature curable epoxy anticorrosive coating is composed of a component A and a component B; the component A consists of film-forming resin, an auxiliary agent, filler, pigment and deionized water, wherein the film-forming resin consists of 25-45 parts of bisphenol F epoxy resin and 20-40 parts ofsilane modified epoxy resin, the weight parts of the auxiliary agent are 2-4 parts, the filler comprises 15-25 parts of nano silicon dioxide and 2-10 parts of lignocelluloses, the pigment is 3-5 partsof titanium dioxide, and the weight parts of the deionized water are 10-20 parts; and the component B is a curing agent and is composed of 3-10 parts of phenolic amine, 2-5 parts of ethylenediamine,2-5 parts of polyamide and 5-10 parts of deionized water. Through the formula system, climate tolerance of the coating can be effectively improved, cracking is prevented, and the coating has the advantages of good corrosion resistance and relatively high adhesive force. The used curing agent is a mixed curing system taking the phenolic amine as a main body, so that the reaction speed of epoxy resin can be effectively accelerated, the curing reaction temperature is reduced, and consumption of curing energy is reduced.

Description

technical field [0001] The invention relates to the field of epoxy coatings, in particular to an ultra-low temperature curing epoxy anticorrosion coating. Background technique [0002] Epoxy coatings have excellent technological properties, mechanical properties and physical properties, and are widely used. However, commonly used epoxy resins have problems such as high viscosity and high curing temperature at room temperature. The curing temperature of conventional epoxy resin / anhydride systems is 180-200°C, and the curing time is 15-30 minutes. On the one hand, the temperature consumes a lot of energy, and on the other hand, it will affect the substrate with poor heat resistance, which limits its application on heat-sensitive substrates, resulting in a narrow application range; and limits the wide application of epoxy resin. Moreover, since the coating film of epoxy coatings will expand or shrink with the change of ambient temperature, this kind of thermal expansion and co...

AI Technical Summary

Problems solved by technology

However, commonly used epoxy resins have problems such as high viscosity and high curing temperature at room temperature. The curing temperature of conventional epoxy resin / anhydride systems is 180-200°C, and the curing time is 15-30 minutes. On the one hand, the temperature consumes a lot of energy, and it will affect the substrate with poor heat resistance, which limits its application on heat-sensitive substrates, resulting in a narrow application range; and limits the wide application of epoxy resin

Moreover, since the coating film of epoxy coatings will expand or shrink with the change of ambient temperature, this kind of thermal expansion and contraction will easily lead to easy cracking of the coating film. If it is applied in an outdoor environment, it will easily cause the film layer to be corroded and the color of the coating will change color. , Adhesion reduction, peeling and other disadvantages

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