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Preparation method of epoxy resin system for prepregs, and prepreg preparation method

A technology of epoxy resin system and epoxy resin matrix, which is applied in the preparation of epoxy resin system for prepreg and the field of prepreg preparation

Inactive Publication Date: 2017-08-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Based on this, it is necessary to provide a kind of epoxy resin for prepreg in order to solve the conflicting problem of the wettability of the epoxy resin system for the prepreg to the reinforcing fiber and the resin fluidity of the prepreg in the background technology. The preparation method of the system enables it to meet the requirements of resin penetration rate in the prepreg composite process and meet the requirements of resin fluidity during prepreg molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] A preparation method for epoxy resin system in prepreg, comprising the following steps:

[0033] S110, stirring the epoxy resin matrix at 50° C. to 100° C. to form component A.

[0034] Wherein, the epoxy resin matrix is ​​selected from at least one of bisphenol A glycidyl ether, novolac epoxy resin and glycidylamine epoxy resin.

[0035] Specifically, the epoxy resin matrix is ​​stirred at 50° C. to 100° C. to form a uniform and stable component A.

[0036] S120, mixing the room temperature reactive curing agent and the latent curing agent to form component B.

[0037] Wherein, the room temperature reactive curing agent is selected from at least one of aliphatic amines and alicyclic amines.

[0038] The latent curing agent is selected from at least one of dicyandiamide, modified dicyandiamide, urea derivatives, diaminodiphenyl sulfone, boron trifluoride monoethylamine and imidazole curing agents.

[0039] S130, mixing and reacting the above component A and component...

Embodiment 1

[0059] (1) Preparation of epoxy resin system for prepreg

[0060] Part A was formed by stirring epoxy novolac resin and liquid bisphenol A type epoxy resin at 50°C. The aliphatic amine and dicyandiamide are mixed to form component B. Component A and component B were mixed and reacted at a mass ratio of 100:20 to obtain an epoxy resin system for prepreg, and the initial viscosity of the epoxy resin system for prepreg was 5000cps.

[0061] (2) Preparation of prepreg

[0062] The above prepregs were prepared into adhesive films with epoxy resin system. Composite the above adhesive film with reinforcing fibers to obtain a prepreg. The resin penetration rate of the prepreg is 30%, and the areal density of the prepreg is 50g / m 2 , the resin fluidity of the prepreg is 16%.

[0063] The above epoxy resin system for prepreg was placed at 25° C. for 7 days, and the viscosity of the epoxy resin system for prepreg was measured to be 15000 cps.

[0064] The above prepreg was placed a...

Embodiment 2

[0066] (1) Preparation of epoxy resin system for prepreg

[0067] The solid bisphenol A type epoxy resin and the liquid bisphenol A type epoxy resin were stirred at 100°C to form Component A. The cycloaliphatic amine and modified dicyandiamide are mixed to form component B. Component A and component B were mixed and reacted at a mass ratio of 100:13 to obtain an epoxy resin system for prepreg, and the initial viscosity of the epoxy resin system for prepreg was 10200cps.

[0068] (2) Preparation of prepreg

[0069] The above prepregs were prepared into adhesive films with epoxy resin system. Composite the above adhesive film with reinforcing fibers to obtain a prepreg. The resin penetration rate of the prepreg is 50%, and the areal density of the prepreg is 500g / m 2 , the resin fluidity of the prepreg is 14%.

[0070] The above epoxy resin system for prepreg was placed at 25° C. for 7 days, and the viscosity of the epoxy resin system for prepreg was measured to be 20000 cp...

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PUM

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Abstract

The present invention provides a preparation method of an epoxy resin system for prepregs. The preparation method comprises: stirring an epoxy resin matrix at a temperature of 50-100 DEG C to form a component A; mixing a room temperature reactive curing agent and a latent curing agent to form a component B; and carrying out a mixing reaction on the component A and the component B according to a mass ratio of 100:10-20 to obtain the epoxy resin system for prepregs. The present invention further provides a prepreg preparation method. According to the present invention, when the epoxy resin system is used for preparing the glue forming film, the viscosity of the epoxy resin system is low so as to ensure the infiltration enhancement of the fibers or each fiber of the fabric, and due to the addition of the room temperature reactive curing agent having the flexible segment, the epoxy resin system can continuously react during the subsequent placing so as to improve the viscosity of the epoxy resin system and reduce the resin fluidity of the prepreg, wherein the flexible segment can toughen the composite material.

Description

technical field [0001] The invention relates to the field of resin-based composite materials, in particular to a method for preparing an epoxy resin system for prepregs and a method for preparing prepregs. Background technique [0002] Prepreg is a resin matrix impregnated with continuous fibers or fabrics under strictly controlled conditions to make a composition of resin matrix and reinforcement, and is an intermediate material for manufacturing composite materials. Since the performance of composite materials largely depends on the performance of prepregs, the quality of prepregs is of great significance to the application and development of composite materials. [0003] In order to improve the quality of the prepreg, it is necessary to adjust the adhesive performance of the prepreg by controlling the viscosity of the resin system, which requires the viscosity of the resin system to be low enough so that the resin system can fully infiltrate each monofilament in the fiber...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C08G59/20C08G59/24C08G59/56C08G59/40C08J5/24C08J5/04C08L63/00C08L63/04
CPCC08G59/20C08G59/245C08G59/4021C08G59/5006C08G59/5026C08G59/504C08G59/56C08J5/04C08J5/24C08J2363/00C08J2363/04
Inventor 刘明任六波王新龙周江明
Owner CHINA PETROLEUM & CHEM CORP
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