Dicyclopentadiene modified unsaturated polyester resin preparation method

Abstract

This invention relates to a method for producing dicyclopentadiene modified unsaturated polyester resin, comprising: 1) unsaturated diacid anhydride, water and dicyclopentadiene perform addition reaction with presence of catalyst to produce dicyclopentadiene ester of unsaturated diacid. The catalyst is a mixture of phosphoric acid and methyl benzene sulfonic acid, wherein the weight ratio of phosphoric acid and methyl benzene sulfonic acid is (2-6):1; 2) add in a mixture of diatomic alcohol and tribasic alcohol to the reaction system to perform polycondensation reaction, finish the reaction till the acidity of the reactants becomes less than 50mgKOH / g, and remove the produced water during the reaction process; 3) cool the reactants to 100-110Deg C, add and homogenously mix the ethenyl crosslinking monomer diluted reactant and polymerization inhibitor to obtain the dicyclopentadiene modified unsaturated polyester resin product. This invention is characterized in that: the obtained UPR product has a superior heat-durability, with heat distortion temperature more than 100Deg C, which is better than the level of current technology.

Description

technical field

[0001] The invention relates to a preparation method of dicyclopentadiene modified unsaturated polyester resin. Background technique

[0002] Unsaturated polyester resin (UPR) is a thermosetting resin mainly used in the manufacture of FRP. It is generally polycondensed from unsaturated dibasic acid or anhydride and diol to form a polymer, and then the polymer is diluted in vinyl crosslinking monomer Made in. Under the action of curing agent, UPR can manufacture FRP products through various processing methods. UPR has excellent mechanical properties, electrical properties and chemical corrosion resistance, but its disadvantages are high brittleness, low impact resistance, and poor heat resistance. UPR modified with dicyclopentadiene (DCPD) can significantly improve toughness and heat resistance. When DCPD is used to modify unsaturated polyester resin, it is mainly that DCPD is depolymerized into cyclopentadiene (CPD), and then CPD undergoes a diene addition...

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