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Prepreg Compression Molding Method

A prepreg and preforming technology, which is applied in the field of materials, can solve the problems of easy deformation of products and poor bonding strength between product layers, and achieve the effects of improving bonding strength, overcoming insufficient positive pressure, and not easily deforming

Active Publication Date: 2011-12-28
SHANGHAI CEDAR COMPOSITES TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of poor bonding strength between product layers and easy deformation of the product during prepreg molding thermoforming, and propose a new prepreg molding method

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] The prepreg molding thermoforming of this embodiment comprises the following steps:

[0019] (1) Prepreg layering; take phenolic molding material, punch the prepreg into required specifications with a knife die, and lay up the material;

[0020] (2) Prepreg preforming, laying up and preforming phenolic molded material sheets according to conventional methods;

[0021] (3) Curing and molding; the curing and molding is: punching the silicone sheet into the required shape with a knife mold;

[0022] Coat oleic acid in the lower mold of the mold, then paste the silicone sheet, and then put the preformed prepreg on the silicone sheet;

[0023] Heating after closing the mold, first heating up, the heating rate is 10°C per hour, keeping warm for 2 minutes when the temperature rises to 160°C, and then cooling down; at the same time, pressurizing 20 minutes after closing the mold, the pressure is 10MPa; heating will make the silicone sheet When heated, it expands to generate i...

Embodiment 2

[0026] The prepreg molding thermoforming of this embodiment comprises the following steps:

[0027] (1) Prepreg layering; take phenolic molding material, punch the prepreg into required specifications with a knife die, and lay up the material;

[0028] (2) Prepreg preforming, laying up and preforming phenolic molded material sheets according to conventional methods;

[0029] (3) Curing and molding; the curing and molding is: punching the silicone sheet into the required shape with a knife mold;

[0030] Coat paraffin wax in the lower mold of the mold, then paste the silicone sheet, and then put the preformed prepreg on the silicone sheet;

[0031] Heating after closing the mold, first heating up, the heating rate is 25 ° C per hour, when the temperature rises to 170 ° C, keep warm for 3 minutes, and then cool down; at the same time, pressurize 30 minutes after closing the mold, the pressure is 29 MPa; heating will make the silicone sheet When heated, it expands to generate i...

Embodiment 3

[0034] The prepreg molding thermoforming of this embodiment comprises the following steps:

[0035] (1) Prepreg layering; take phenolic molding material, punch the prepreg into required specifications with a knife die, and lay up the material;

[0036] (2) Prepreg preforming, laying up and preforming phenolic molded material sheets according to conventional methods;

[0037] (3) Curing and molding; the curing and molding is: punching the silicone sheet into the required shape with a knife mold;

[0038] Coat silicone rubber in the lower mold of the mold, then paste the silicone sheet, and then place the preformed prepreg on the silicone sheet;

[0039] After closing the mold, heat it up, firstly heat up at a rate of 30°C per hour, keep warm for 5 minutes when the temperature rises to 175°C, and then cool down; at the same time, pressurize 90 minutes after closing the mold, the pressure is 39MPa; heating will make the silicone sheet When heated, it expands to generate interna...

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Abstract

The invention relates to a compression moulding method for a prepreg in the technical field of materials. The compression moulding method for the prepreg comprises the following steps of: laying the prepreg; premolding the prepreg; and solidifying and molding, namely adhering a silica gel sheet in an upper mould, a lower mould or both the upper mould and the lower mould, laying the prepreg on the silica gel sheet, closing the mould, heating, and solidifying and moulding. In the method, the silica gel sheet is used as an assistant measure for hot compression moulding of the prepreg; and due to the thermal expansion performance of the silica gel sheet, in heating moulding, the silica gel sheet is heated and expanded and generates internal pressure, so that the prepreg sheet is subjected to uniform pressure in all directions; therefore, the technical problems that the positive pressure on the side wall of a manufactured product is insufficient and the manufactured product is affected by internal pull are solved, the bonding strength between layers of the manufactured product is greatly improved, and the manufactured product is difficult to deform.

Description

technical field [0001] The invention relates to a forming method in the technical field of materials, in particular to a prepreg compression molding method. Background technique [0002] The basic engineering of the prepreg compression molding process is: put a certain amount of pretreated molding material into the preheated mold, apply higher pressure to make the molding material fill the mold cavity, and make the molding under a certain pressure and temperature. The material is gradually solidified, and then the product is taken out from the mold, and the final product is obtained after necessary auxiliary processing. [0003] When the prepreg is molded and thermoformed, when the product contains a complex curved surface structure, its side has an angle with the plane of the pallet of the molding machine, and some even have a vertical angle; when the molding machine is pressurized, the force on the side of the product is decomposed into The positive pressure in the side d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/44B29C70/54
Inventor 朱家强罗剑岚周新乐王明路建峰李炜
Owner SHANGHAI CEDAR COMPOSITES TECH CO LTD
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