Vinyl ester resin for fiber glass-reinforced plastic mold and preparation method thereof

A vinyl ester resin, glass fiber reinforced plastic mold technology, applied in the field of vinyl ester resin and its preparation, can solve the problem of limited improvement in shrinkage rate, achieve unaffected strength and heat resistance, reduce exothermic temperature, reduce shrinkage rate Effect

Active Publication Date: 2012-05-02
CHANGZHOU TIANMA GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has limited improvement on the shrinkage rate (the shrinkage rate has been tested to be between 1.5% and 2%)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0022] The vinyl ester resin for FRP mold of the present embodiment is made of 500g of E20 epoxy resin, 86g of methacrylic acid, 1.0g of benzyldimethylamine, 0.22g of hydroquinone, 379g of styrene and 12g of α-methylstyrene become.

[0023] The specific preparation method is as follows:

[0024] ①Put 500g of E20 epoxy resin into the reactor, start oil bath heating, when the temperature rises to 80°C, start stirring, add 1.0g of benzyldimethylamine, 0.22g of hydroquinone, when the temperature rises to 115°C , stop heating, add 86g of methacrylic acid dropwise, and keep the temperature of 115°C for the reaction. The end point of the reaction is controlled by the acid value. When the acid value is less than 20mgKOH / g, the reaction is stopped. The whole reaction process takes about 4.5h.

[0025] ② Cool down to below 100°C and add 379g of styrene and 12g of α-methylstyrene. Stir well, and finally cool to ambient temperature (0°C-40°C), filter to obtain light yellow viscous liqui...

Embodiment 2～ Embodiment 3）

[0027] Each embodiment is basically the same as Embodiment 1, and the differences are shown in Table 1. The quality index of the vinyl ester resin prepared in each embodiment is shown in Table 2, and the mechanical properties and shrinkage index are shown in Table 3.

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Abstract

The invention discloses vinyl ester resin for a fiber glass-reinforced plastic mold and a preparation method thereof. The vinyl ester resin is prepared from the following components in part by weight: 100 parts of epoxy resin, 15-20 parts of unsaturated monobasic acid, 0.1-0.3 part of catalyst, 0.03-0.06 part of polymerization inhibitor, 70-80 parts of styrene and 2-3 parts of alpha- vinyltoluene. The preparation method comprises the following steps of: feeding the epoxy resin in a reactor and raising the temperature to be 70-90DEG C; adding the catalyst and the polymerization inhibitor by stirring; continuously raising the temperature to be 105-115DEG C; dropping the unsaturated monobasic acid; after dropping, reacting at the temperature until the acid value of a reaction system is smaller than 20mgKOH/g; reducing the temperature to be 70-100DEG C and adding the styrene and the alpha-vinyltoluen; and fully stirring, cooling to the ambient temperature and filtering. The vinyl ester resin disclosed by the invention has shrinking percentage of less than or equal to 0.5 percent and is suitable for manufacturing high-grade fiber glass-reinforced plastic molds.

Description

technical field [0001] The invention relates to a vinyl ester resin and a preparation method thereof, in particular to a vinyl ester resin for glass fiber reinforced plastic molds and a preparation method thereof. Background technique [0002] With the rapid development of China's FRP industry, a problem that everyone is concerned about is how to further improve the quality of FRP products. The quality of FRP products depends to a large extent on the molds. To improve product quality, there must be good molds. Good FRP molds must not only meet the accuracy of product dimensions, but also meet their structural mechanics according to product performance. properties and mechanical properties, etc. In terms of appearance, it must have a certain degree of smoothness, smoothness and uniform thickness. High-end molds have higher requirements. And all of this is closely related to the properties of the materials used in mold making. [0003] Usually, the thickness of the FRP mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/14C08G59/16C08G59/17
Inventor 宣维栋曹鑫王海军姚易新
Owner CHANGZHOU TIANMA GROUP CO LTD
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