Synthetic method of modified high-toughness epoxy vinyl ester resin

A technology of epoxy vinyl ester and synthesis method, which is applied in the synthesis of epoxy vinyl ester resin and the synthesis field of modified high toughness epoxy vinyl ester resin, can solve the problems affecting the stability of the final product and the arrangement of the main molecular chain. Irregularity, uneven molecular weight distribution, etc., to achieve the effect of clear control of the reaction end point, high elongation at break, and high toughness

Active Publication Date: 2013-09-18
HUACHANG POLYMER EAST CHINA UNIV OFSCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 454g E44 bisphenol A type epoxy resin, 163.4g methacrylic acid, 20.2g sebacic acid, 2g tetraethylammonium chloride, 1g triphenylphosphine, 0.2g terephthalic acid in the reaction kettle in a stirring state Phenol, gradually increase the temperature; control the temperature of the reactant to react at 100-130°C, measure the acid value every hour until the acid value drops below 10mgKOH / g; cool the reaction product to about 100°C and add 240g of styrene to control the temperature Stir evenly at 60-80°C; add 20g polymethylene polyphenyl isocyanate and 2g dibutyltin dilaurate, control the reaction temperature at 60-80°C, measure the isocyanate content every hour until the isocyanate reaches 0 is the end point of the reaction to obtain a modified high-toughness epoxy vinyl ester resin.

Embodiment 2

[0031] Add 380g E51 bisphenol A type epoxy resin, 122.2g acrylic acid, 29.2g adipic acid, 2g benzyltriethylammonium chloride, 1g triphenylarsine, 0.2g methyl para Hydroquinone, gradually increase the temperature; control the temperature of the reactant to react at 100-130°C, measure the acid value every hour until the acid value drops below 10mgKOH / g; cool the reaction product to about 100°C and add 200g of styrene, 40g of divinylbenzene, control the temperature at 60-80°C and stir evenly; add 15g of polymethylene polyphenyl isocyanate and 2g of dibutyltin dilaurate, control the reaction temperature at 60-80°C, measure the isocyanate every hour The content of the acid group is changed until the isocyanate group reaches 0 as the reaction end point to obtain a modified high-toughness epoxy vinyl ester resin.

Embodiment 3

[0033] Add 380g E51 bisphenol A epoxy resin, 129g methacrylic acid, 52.2g suberic acid, 2g catalyst benzyltrimethylammonium bromide, 1g triphenylphosphine, 0.2g 2 , 5-di-tert-butyl hydroquinone, gradually increase the temperature; control the temperature of the reactant to react at 100-130°C, measure the acid value every hour until the acid value drops below 10mgKOH / g; cool the reaction product to Add 200g styrene and 40g methyl methacrylate at about 100°C, control the temperature at 60-80°C and stir evenly; add 10g polymethylene polyphenylisocyanate and 1g dibutyltin dilaurate, control the reaction temperature at 60-80°C , Measure the isocyanate content every hour until the isocyanate reaches 0 as the end point of the reaction to obtain a modified high-toughness epoxy vinyl ester resin.

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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...

Claims

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Application Information

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IPC IPC(8): C08F283/10C08G59/42C08G59/17C08G59/14
Inventor 刘坐镇钱建华宋建国
Owner HUACHANG POLYMER EAST CHINA UNIV OFSCI & TECH
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