Impact-resistant epoxy vinyl ester resin and its preparation method and use

Abstract

The invention relates to an impact-resistant epoxy vinyl ester resin and its preparation method and use. The impact-resistant epoxy vinyl ester resin comprises, by mass, A, 40-50% of epoxy resin, B, 5-25% of unsaturated monocarboxylic acid, C, 0.03-0.1% of a polymerization inhibitor, D, 0.2-0.5% of a catalyst and E, 30-40% of a crosslinking monomer. The epoxy resin is one of bisphenol F epoxy resin, hydrogenated bisphenol A epoxy resin, and dimer acid-modified epoxy resin. The preparation method utilizes a ring-opening esterification reaction of the flexible epoxy resin and organic unsaturated monocarboxylic acid, utilizes an appropriate raw material ratio, greatly improves resin toughness, realizes resin casting impact strength of 20-30KJ/m<2>, utilizes less types of the raw materials, has simple synthesis processes, is environmentally friendly, and does not produce three wastes. The impact-resistant epoxy vinyl ester resin has good stability.

Description

technical field [0001] The invention relates to an epoxy resin modified with an unsaturated compound, in particular to an impact-resistant epoxy vinyl ester resin, a preparation method and application thereof. Background technique [0002] Epoxy vinyl ester resin is an addition reaction product of epoxy resin and an unsaturated monobasic acid containing carboxyl groups, and diluted with a reactive monomer. Epoxy vinyl ester resin has good corrosion resistance , both the mechanical properties of epoxy resin and the excellent characteristics of unsaturated polyester resin curing at room temperature. Resin-based composite materials made of epoxy vinyl ester resin have been widely used in chemical anticorrosion, flue gas desulfurization, transportation, electronic appliances, etc. Although the overall performance of epoxy vinyl ester resin is excellent, some aspects of performance, such as impact strength and elongation at break, cannot meet the special requirements of some FRP...

AI Technical Summary

Problems solved by technology

But the shortcoming of this synthetic method is: the one, while epoxy resin and monobasic unsaturated carboxylic acid ring-opening esterification reaction, produce competitive esterification with the carboxyl group of organic unsaturated dibasic acid and the carboxyl group of carboxyl-terminated nitrile rubber reaction, the main molecular chain of the epoxy vinyl ester is irregularly arranged, and the molecular weight distribution is uneven, which affects the stability of the final product; the second is that the nitrile rubber that has not participated in the reaction is modified with nitrile rubber during the reaction. Phase separation of the generated modified epoxy vinyl ester main chain easily leads to delamination, and poor miscibility between the polymer epoxy vinyl ester main chain modified with nitrile rubber and crosslinkable monomers, especially styrene, is prone to occur Crystallization and delamination phenomenon, affecting the use

[0004] Chinese patent application CN102558456A discloses a synthesis method of epoxy vinyl ester resin, which comprises: bisphenol A type epoxy resin, unsaturated monocarboxylic acid, long chain saturated dibasic acid, catalyst, Inhibitors and other components, the invention increases the molecular weight and toughness of the polymer by using isocyanate to carry out chain extension reaction with the hydroxyl group on the epoxy resin, but toluene diisocyanate is highly toxic and dangerous, and it is harmful to equipment and personnel. High standard

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