Molded epoxy resin sheet and its preparation process

A technology of sheet molding compound and epoxy sheet, which is applied in the field of materials, can solve the problems of not adopting the method of chemical thickening and compression molding, and achieve the effect of increased strength, excellent product performance, corrosion resistance and insulation performance

Inactive Publication Date: 2009-11-04
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, add them into the mixer with heating and heat preservation device in proportion, and then add curing agent, thickener and organic acid after mixing evenly to make a ring Oxygen paste. In parts by weight, the ratio of each raw material is: 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 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 internal mold release agent uses calcium stearate, the filler uses light calcium carbonate, and the fiber uses alkali-free glass fiber with a...

Embodiment 2

[0038] In this example, except that each raw material proportioning has following change, other is the same as embodiment 1.

[0039] In parts by weight, the ratio of each raw material is: 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 release agent, 80 parts of filler, Fiber 50 parts.

Embodiment 3

[0041] In this example, except that each raw material proportioning has following change, other is the same as embodiment 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 release agent, 180 parts of filler, Fiber 150 parts.

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PUM

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Abstract

The invention discloses an epoxy sheet molding compound, wherein the middle core material is composed of fibers impregnated with epoxy resin paste, and the upper and lower surfaces are covered with PE films. In parts by weight, the epoxy sheet molding compound is made of the following raw materials: 100 parts of epoxy resin, 4-20 parts of diluent, 15-80 parts of curing agent, 9-16 parts of thickener, 6 parts of organic acid ~18 parts, 1~4 parts of internal release agent, 80~180 parts of filler, 50~150 parts of fiber. The preparation steps of the epoxy sheet molding compound include the preparation of epoxy resin paste, the preparation of the epoxy sheet molding compound and the curing of the epoxy sheet molding compound. The epoxy sheet molding compound has the advantages of good thermal fluidity, short curing time, long storage time and the like, and the preparation process is simple. Higher-strength epoxy composite structural parts can be prepared by hot-press curing. Compared with unsaturated polyester SMC products, the strength is greatly improved, and the corrosion resistance and insulation properties are enhanced.

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] Compression molding process is an important composite material forming process, and sheet molding compound (SMC) is an important molding material for molding process. The middle core material of SMC is composed of glass fiber impregnated 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 sheet machine is impregnated with glass fiber to make a sheet, then rolled, and then thickened to a non-sticky state for molding. SMC sheet is a molded material developed in the 1960s to manufacture fiber-reinforced plastics by dry method. After more than 40 years of development, the SMC molding process has gradually developed into the most m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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