Method for preparing thickenable dicyclopentadiene unsaturated polyester resin

A technology of dicyclopentadiene and polyester resin, which is applied in the field of preparation of polymer compounds, can solve the problems of inability to meet the use requirements of unsaturated polyester molding compounds, poor thickening properties, etc., and achieves easy industrial expansion of production, low cost, Practical effect

Active Publication Date: 2008-07-30
SICHUAN DONGFANG INSULATING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the common poor thickening properties of existing dicyclopentadiene-type unsaturated polyester resins, which cannot meet the requirements of unsaturated polyester molding materials, and improve the synthesis method through multi-step catalytic reaction technology and process, thereby providing a preparation method of dicyclopentadiene type unsaturated polyester resin that is easy to operate, stable in product quality, low in cost and thickensable

Method used

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  • Method for preparing thickenable dicyclopentadiene unsaturated polyester resin

Examples

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Embodiment 1

[0032] A kind of preparation method that can thicken dicyclopentadiene type unsaturated polyester resin is in the 1000mL four-necked flask that is equipped with stirrer, thermometer, reflux condenser, dropping funnel, adds 150g (1.530mol) cis-butyl Dicyclopentadiene, 27.5g (1.530mol) deionized water, start stirring, heat up to 100°C-140°C and keep it for 1h for hydrolysis reaction; add 130g (0.902mol) dicyclopentadiene dropwise at 110°C-180°C, add dropwise Time 1h; dropwise reaction at this temperature for 1h; add 45g (0.789mol) ethylene glycol, catalyst sodium acetate 0.25g (0.00305mol), polymerization inhibitor p-benzoquinone 0.12g (0.00111mol), and gradually increase the temperature Carry out dehydration polycondensation reaction at 200℃~210℃; when the acid value of the reactant reaches 65mgKOH / g, vacuum dehydration; when the acid value of the reactant reaches 30mgKOH / g~35mgKOH / g, release the vacuum and cool down; when the temperature of the reactant drops When the temperat...

Embodiment 2

[0034] The addition of dicyclopentadiene is increased to 176g (1.224mol), the addition of ethylene glycol is reduced to 28g (0.459mol), and the others are the same as in Example 1 (omitted). The viscosity of the product is 1075mPa·s (25°C), the gel time is 2.8min (126°C), and the acid value is 19.7mgKOH / g. After the resin thickening test, the viscosity of the resin paste increased to 9700Pa·s (25°C).

Embodiment 3

[0036] Dicyclopentadiene add-on is reduced to 88g (0.612), ethylene glycol add-on increases to 66g (1.071mol), other is the same as embodiment 1 (omitted). The viscosity of the product is 1138mPa·s (25°C), the gel time is 3.4min (126°C), and the acid value is 22.3mgKOH / g. After the resin thickening test, the viscosity of the resin paste increased to 11800Pa·s (25°C).

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Abstract

The invention relates to a preparation method for dicyclopentadiene unsaturated polyester resin which can be thickened. The method is characterized in that reaction material, namely, dibasic acid (anhydride) and deionized water are added into a reactor according to the mol ratio of 1: 1.0 to 1.2, the temperature is raised to 100 to 140 DEG C, and hydrolytic reaction is performed for 0.5 to 1h; 0.4 to 0.8 mol of dicyclopentadiene is titrated at 110 to 180 DEG C for hydrion displacement addition reaction and diolefine addition reaction, and after the titration is finished, reaction is performed again for 1 to 2h at the temperature; 0.3 to 0.7 mol of dibasic alcohol, catalyst accounting for 0.07 to 0.30 percent of the total material weight, and polymerization inhibitor accounting for 0.03to 0.07 percent of the total material weight are added, and the temperature is gradually raised to 200 to 210 DEG C for polycondensation reaction for 0.5 to 1h; after vacuum dehydration, styrene is added for dilution, and then the product can be obtained. The dicyclopentadiene unsaturated polyester resin synthesized through the multi-step synthesis method of the invention can be thickened, and the product is suitable to be used as the substrate resin for unsaturated polyester molding compound.

Description

technical field [0001] The present invention belongs to the preparation method of macromolecular compound, relates to a kind of preparation method that can thicken dicyclopentadiene type unsaturated polyester resin, the resin prepared by this method is suitable as the matrix of unsaturated polyester molding compound (SMC / BMC) resin. Background technique [0002] Unsaturated polyester resin is a thermosetting resin. The thermosetting material of pure unsaturated polyester resin has low mechanical strength, and it is generally used to make composite materials with reinforced materials. The unsaturated polyester resins widely used in composite materials are basically phthalic acid type (referred to as orthophthalic type), isophthalic acid type (referred to as isophthalic type), bisphenol A type and vinyl ester type, halogen Substitute unsaturated polyester resin, dicyclopentadiene type unsaturated polyester resin, etc. [0003] Yang Kai from South China University of Technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/52C08G63/78
Inventor 许自贵
Owner SICHUAN DONGFANG INSULATING MATERIAL
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