Method for preparing epoxy sheet mould plastic

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

Inactive Publication Date: 2008-01-02
SHANGHAI MANSDA INDAL
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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 th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The preparation method of the epoxy sheet molding compound provided by the invention comprises the steps of preparing epoxy resin paste, preparing the epoxy sheet molding compound and curing the epoxy sheet molding compound.

[0029] In the epoxy sheet molding compound provided by the present invention, the middle core material is composed of fibers impregnated with epoxy resin paste, and the upper and lower sides are covered with PE film; in parts by weight, the epoxy sheet molding compound is composed of the following raw materials: Preparation: 100 parts of mixed epoxy resin, 4 to 10 parts of diluent, 15 to 80 parts of curing agent, 5 to 20 parts of thickener, 1 to 4 parts of internal mold release agent, 80 to 180 parts of filler, 50 to 50 parts of fiber 150 parts; wherein, the mixed epoxy resin is composed of 60-90 parts of liquid glycidyl ether epoxy resin and 10-40 parts of solid bisphenol A epoxy resin.

Embodiment 1

[0032] 1. Preparation of epoxy resin paste:

[0033] Add liquid glycidyl ether type epoxy resin and solid bisphenol A type epoxy resin into the mixer with heating and heat preservation device, heat it to make it fully mixed; Sequentially add to the mixer in proportion, mix well, then add curing agent and thickener, mix well to make epoxy resin paste. In parts by weight, the ratio of each raw material is: 90 parts of liquid glycidyl ether type epoxy resin, 10 parts of solid bisphenol A type epoxy resin, 10 parts of diluent, 50 parts of curing agent, 5 parts of thickener, 4 parts of internal release agent, 180 parts of filler, and 150 parts of fiber.

[0034] In the above formula, the liquid glycidyl ether type epoxy resin is epoxy resin E-44, the solid bisphenol A type epoxy resin is E-14, the diluent is phenyl glycidyl ether, and the curing agent is novolak resin. The thickener is toluene diisocyanate, the internal release agent is calcium stearate, the filler is light calci...

Embodiment 2

[0040] In this example, except that each raw material proportioning has following change, other is the same as embodiment 1.

[0041]In parts by weight, the ratio of each raw material is: 60 parts of liquid glycidyl ether type epoxy resin, 40 parts of solid bisphenol A type epoxy resin, 4 parts of diluent, 20 parts of curing agent, 5 parts of thickener, 1 part of internal release agent, 80 parts of filler, 50 parts of fiber.

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PUM

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Abstract

The invention provides a method for preparing an epoxy sheet-like mold plastic, which comprises the following steps: thickening the mixed epoxide resin system with diisocyanate compound; strengthening the chopped strand; making the tectorial into non-stick hand and shear epoxy sheet-like mold plastic, that is, preparing the epoxide resin paste and the epoxy sheet-like mold plastic; ripening. The epoxy sheet-like mold plastic comprises the following parts: 100 quetient mixed epoxide resin, 4-10 quetient deflocculating agent, 15-80 quetient curing agent, 5-20 quetient thickener, 1-4 quetient internal releasing agent, 80-180 filler and 50-150 fiber, wherein the intermediate core material of the epoxy sheet-like mold plastic comprises fiber which is dipped epoxide resin paste, and the up-down surface is covered by PE thin film. The epoxy sheet-like mold plastic is provided with the good heat flow property, the short curing time, the long saving time and the corrosion resistant, which can be made high strength epoxide composite material part.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for preparing epoxy sheet molding compound and its products. 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 mo...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08K5/29C08J5/06B29C70/34B29C70/54C08K3/00
Inventor 黄志雄黄正群秦岩梅启林李建罗林赵颖赵亮阎浩
Owner SHANGHAI MANSDA INDAL
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