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Molded epoxy resin sheet and its prepn process

A sheet molding compound and molding compound technology, applied in the field of materials, can solve the problems such as the method of molding without chemical thickening, and achieve the effects of improved strength, good fluidity, corrosion resistance and insulation performance.

Inactive Publication Date: 2007-12-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the existing glass fiber-reinforced epoxy molding compounds are used in electronic packaging. Although some of them are made into sheets, they use mixing methods instead of chemical thickening and compression molding methods. True Epoxy SMC

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Preparation of epoxy resin paste:

[0031] According to the order of epoxy resin, diluent, internal mold release agent and filler, they are added to the mixer with heating and heat preservation device in sequence, and after mixing evenly, the curing agent, thickener and organic acid are added, and mixed evenly to form a ring. Oxygen resin paste. In parts by weight, the proportions of the raw materials are: 100 parts of epoxy resin, 11 parts of diluent, 30 parts of curing agent, 10 parts of thickener, 9 parts of organic acid, 3 parts of internal mold release agent, 100 parts of filler, Fiber 70 parts.

[0032] In the above formula, the epoxy resin adopts bisphenol A diglycidyl ether type epoxy resin E-44, the diluent adopts phenyl glycidyl ether, the curing agent adopts novolac resin, the thickener adopts magnesium oxide, and the organic acid adopts n-octanoic acid. , The inner release agent is calcium stearate, the filler is light calcium carbonate, and the fiber i...

Embodiment 2

[0038] In this example, except that each raw material ratio has the following changes, the others are the same as in Example 1.

[0039] In parts by weight, the proportions of each raw material are: 100 parts of epoxy resin, 4 parts of diluent, 20 parts of curing agent, 9 parts of thickener, 18 parts of organic acid, 1 part of internal mold release agent, 80 parts of filler, Fiber 50 parts.

Embodiment 3

[0041] In this example, except that each raw material ratio has the following changes, the others are the same as in Example 1.

[0042] In parts by weight, the ratio of each raw material is: 100 parts of epoxy resin, 20 parts of diluent, 50 parts of curing agent, 16 parts of thickener, 6 parts of organic acid, 4 parts of internal mold release agent, 180 parts of filler, Fiber 150 parts.

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PUM

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Abstract

The present invention discloses one kind of molded epoxy resin sheet comprising core of epoxy resin dipped fiber and facing layers of PE film. The molded epoxy resin sheet has the materials including epoxy resin 100 weight portions, diluent 4-20 weight portions, curing agent 15-80 weight portions, thickening agent 9-16 weight portions, organic acid 6-18 weight portions, internal demolding agent 1-4 weight portions, stuffing 80-180 weight portions, and fiber 50-150 weight portions. Its preparation process includes the steps of: preparing epoxy resin paste, forming molded epoxy resin sheet and curing molded epoxy resin sheet. The molded epoxy resin sheet has simple preparation, high strength, high corrosion resistance and high insulating property.

Description

technical field [0001] The invention relates to the field of materials, in particular to an epoxy sheet molding compound and a preparation method thereof. Background technique [0002] The molding process is an important composite material molding process, and the sheet molding compound SMC (sheet molding compound) is an important molding material for the molding process. The middle core material of SMC is composed of glass fiber infiltrated with resin paste, and the upper and lower sides are covered with PE film; the resin paste is composed of unsaturated resin, low shrinkage additive, curing agent, thickener, internal mold release agent, and filler. The SMC tablet machine impregnates glass fiber to make a sheet, which is then wound, and then thickened to a non-stick state for compression molding. SMC sheet is a molding material for dry manufacturing fiber reinforced plastics developed in the 1960s. After more than 40 years of development, the SMC molding process has gradu...

Claims

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Application Information

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IPC IPC(8): B32B5/28B32B27/04B32B27/12B32B27/18B32B37/15C08L63/02C08K5/09C08K3/00
Inventor 秦岩黄正群黄志雄梅启林王雁冰李建赵颖阎浩袁露
Owner WUHAN UNIV OF TECH
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