Synthetic method of modified high-toughness epoxy vinyl ester resin

Abstract

The invention relates to a synthetic method of modified high-toughness epoxy vinyl ester resin, belonging to the technical field of high-molecular polymers. The synthetic method is characterized by comprising the following steps of: (1) sequentially adding 40%-50% of bisphenol A type epoxy resin, 8%-20% of unsaturated monocarboxylic acid, 2.5%-11% of long-chained saturated dicarboxylic acid, 0.1%-1.0% of catalyst A, and 0.01%-0.1% of polymerization inhibitor into a reaction kettle; (2) controlling the temperature to be 100-130 DEG C to measure an acid value until the acid value is reduced to 10mgKOH / g below; and (3) cooling to about 100 DEG C, then adding 28%-40% of crosslinking agent, 1.0-5.0% of polymethylene polyphenyl isocyanate, and 0.05%-0.5% of catalyst B, and controlling the temperature to be 60-80 DEG C until the measured isocyanato concentration is zero, thus achieving the reaction endpoint. The synthetic method has the advantages that the long-chained saturated dicarboxylic acid is used for partially replacing an unsaturated monocarboxylic acid to react, dilution is carried out before the polymethylene polyphenyl isocyanate is added for chain extension, the chain extension reaction is thorough, and the toughness effect is good. The synthetic method is simple in technology, clear in endpoint, less in side effects, and free from generation of three wastes, and the quality is stable.

Description

technical field [0001] The invention relates to a synthesis method of epoxy vinyl ester resin, in particular to a synthesis method of modified high-toughness epoxy vinyl ester resin, which belongs to the technical field of high molecular polymers. Background technique [0002] Epoxy vinyl ester resin is an addition reaction product of an epoxy resin and an ethylenically unsaturated monobasic acid, diluted with a reactive monomer. Epoxy vinyl ester resin has good corrosion resistance, and has excellent mechanical properties of epoxy resin and 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. However, compared with epoxy resin, the toughness of epoxy vinyl ester resin cured product is poor, which cannot meet the requirements of high-speed railways, fan blades, s...

AI Technical Summary

Problems solved by technology

However, the disadvantages of this synthesis process are: firstly, while the ring-opening esterification reaction between epoxy resin and monobasic unsaturated carboxylic acid, it will produce competitive ester with the carboxyl group of organic unsaturated dibasic acid and the carboxyl group of carboxyl-terminated nitrile rubber. chemical reaction, the main molecular chain of epoxy vinyl ester is arranged irregularly, and the molecular weight distribution is uneven, which affects the stability of the final product; the second is that the nitrile rubber that does not participate in the reaction is modified due to the use of nitrile rubber during the reaction. Phase separation with the generated modified epoxy vinyl ester main chain is easy to cause delamination, and the high molecular epoxy vinyl ester main chain modified with nitrile rubber has poor miscibility with crosslinkable monomers, especially styrene. Crystallization and stratification occur, affecting use