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Dicyclopentadiene modified unsaturated polyester resin preparation method

A technology of dicyclopentadiene and polyester resin, which is applied in the field of preparation of dicyclopentadiene modified unsaturated polyester resin, and can solve problems such as the reduction of mechanical properties of UPR products and the influence of heat resistance of UPR products

Active Publication Date: 2006-12-20
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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Problems solved by technology

Therefore, the average molecular weight of UPR obtained by this method is too low, and when the molecular weight is too low, many mechanical properties of UPR products will be reduced, especially the heat resistance of UPR products will be greatly affected

Method used

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  • Dicyclopentadiene modified unsaturated polyester resin preparation method

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Embodiment 1～8

[0022] Under nitrogen protection, 196g of maleic anhydride and the required amount of DCPD were added to a 0.5-liter reactor, and the required amount of catalyst composition phosphoric acid and toluenesulfonic acid were added. Stir and heat up, when the temperature rises above 100°C, add 36g of water, control the reaction temperature to 150-170°C, and react for 2 hours. Add the required amount of propylene glycol and glycerin, gradually raise the temperature, and continuously fractionate the water in the system. When the acid value of the reactant is 90-100mgKOH / g, a polymerization inhibitor p-tert-butylcatechol is added, and the amount of the polymerization inhibitor added is 0.01-0.2wt% based on the total amount of the reactant. Continue the reaction, keep it for about half an hour when the reaction temperature rises to 200-205°C, and stop the reaction until the acid value of the reactant is less than 50mgKOH / g. Cool the reactant to 100-110°C, add the required amount of cro...

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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...

Claims

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Application Information

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IPC IPC(8): C08G63/52
Inventor 马洪玺谢家明陈丽华陈洪军
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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