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Medium-temperature curing epoxy resin composition for hot-melt method prepreg and preparation method thereof

A technology for curing epoxy resin and solid epoxy resin, which is applied in the field of preparation of medium-temperature curing epoxy resin composition for hot-melt prepreg, and can solve the problem of uneven dispersion of powdered curing agent or accelerator and complicated preparation process , defoaming difficulties and other problems, to achieve the effect of shortening the thermal history, simplifying the process flow and shortening the mixing time

Active Publication Date: 2018-01-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention aims at the technical problems such as difficult degassing, uneven dispersion of powdered curing agent or accelerator, complicated preparation process and other technical problems in the preparation process of the existing epoxy resin composition for hot-melt method prepreg, and provides a hot-melt Method for preparing medium temperature curing epoxy resin composition for prepreg

Method used

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  • Medium-temperature curing epoxy resin composition for hot-melt method prepreg and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The epoxy resin composition is composed by mass fraction: 331, 60 parts; 671, 40 parts; 1400F, 3 parts; UR-D, 1 part.

[0042] The preparation method of the epoxy resin composition: add 20 grams of glass beads with a particle size between 2 and 4 mm in the container of the rotation and revolution vacuum mixer as the grinding medium, and add the weighed components into the container according to the above mass fraction middle. First, stir for 3 minutes under the condition of vacuum degree of 30kPa and rotation speed of 2000rpm, then stir for 8 minutes under the condition of vacuum degree of 0.3kPa and rotation speed of 2000rpm, and the epoxy resin composition is obtained after stirring.

[0043] The preparation method of the cured product: put the standard spline mold into a blast oven, keep it warm for 1 hour after the temperature rises to 120°C, cast the epoxy resin composition into the mold, and cure it at constant temperature for 1 hour, then naturally cool to room ...

Embodiment 2

[0046] The epoxy resin composition is composed according to the mass fraction: 331, 60 parts; 671, 40 parts; 1400F, 3 parts; UR-D, 2 parts.

[0047] The preparation method of the epoxy resin composition and its cured product is the same as in Example 1.

[0048] Table 1 shows the test results of the epoxy resin composition and its cured product.

Embodiment 3

[0050] The epoxy resin composition is composed by mass fraction: 331, 60 parts; 671, 40 parts; 1400F, 4 parts; UR-D, 2 parts.

[0051] The preparation method of the epoxy resin composition and its cured product is the same as in Example 1.

[0052] Table 1 shows the test results of the epoxy resin composition and its cured product.

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Abstract

The invention relates to a preparation method of a medium-temperature curing epoxy resin composition for hot-melt prepreg, which mainly solves the problem of powdery curing agent and accelerator due to the high viscosity of the system during the mixing process of the hot-melt prepreg resin matrix. There are technical problems such as uneven agent dispersion, difficulty in removing air bubbles, long mixing process, and short storage period of prepreg at room temperature. The present invention is carried out by adopting the mixing process as follows: a, the solid epoxy resin is broken into particles with a diameter less than 15mm; b, adding the above-mentioned solid epoxy resin, liquid epoxy resin, toughening c. Set the stirring conditions of the self-rotating and revolving mixer: stirring speed 500-2000 rpm, vacuum degree 0.2kPa-normal pressure, stirring time 1-30 minutes, after the stirring program is automatically completed, The technical scheme of obtaining a fully defoamed and uniformly mixed epoxy resin composition solves this problem, and the epoxy resin composition provided by the invention can be used as a matrix resin of a prepreg.

Description

technical field [0001] The invention relates to a preparation method of a medium-temperature curing epoxy resin composition for a hot-melt method prepreg. Background technique [0002] Prepreg is a composition of resin matrix and reinforcing fiber made by impregnating continuous fiber or fabric with resin matrix, and is an intermediate material for the production of composite materials. Compared with the direct molding process, the resin content of the composite material produced by prepreg is more accurate, so the quality of the product is more stable, and it is currently the preferred molding process for composite material manufacturers at home and abroad. [0003] Prepregs are divided into thermosetting prepregs and thermoplastic prepregs according to the type of matrix resin. Thermosetting prepreg has mature production process, good bonding performance and low production price, occupying most of the prepreg market; the impregnation process of thermoplastic prepreg is st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/02C08L63/04C08L9/02C08L15/00C08L63/00C08G59/50
Inventor 张藕生周文乐傅荣政温凤王芳
Owner CHINA PETROLEUM & CHEM CORP