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Method for producing composite product by blowing process

A composite material and product technology, which is applied in the field of composite material products produced by air blowing process, can solve the problems of difficulty in ensuring the tightness between the mold and the prepreg, complicated process and high difficulty in operation, and achieves good molding effect, simple overall operation, The effect of easy construction operation

Pending Publication Date: 2022-03-08
湖北长盛复合材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of bag press molding method is relatively complicated, difficult to operate, and it is difficult to ensure the tightness between the mold and the prepreg

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Mold pretreatment: Evenly smear release wax on the surface of the negative film, then spray the gel coat resin, and let it stand until the gel coat resin solidifies;

[0019] (2) Blow molding: Wrap the prepreg on the preformed film to achieve the shape and size of the composite product, take out the preformed film, put it into the mandrel, and then put the prepreg and mandrel into the mold cavity , heating to 135°C and blowing air to the mandrel for curing. The curing time is 2 hours. During the blowing process, the mandrel is filled with the mold cavity to make it fit the surface of the mold cavity. After curing, the mandrel is removed to obtain Composite products.

[0020] Wherein, in step (2), the mandrel is silica gel, the hardness is 30°, and the volume thermal expansion coefficient range of silica gel is 6.5x10 -4 / °C.

Embodiment 2

[0022] (1) Mold pretreatment: Evenly smear release wax on the surface of the negative film, then spray the gel coat resin, and let it stand until the gel coat resin solidifies;

[0023] (2) Blow molding: Wrap the prepreg on the preformed film to achieve the shape and size of the composite product, take out the preformed film, put it into the mandrel, and then put the prepreg and mandrel into the mold cavity , heated to 140°C and blowing air to the mandrel for curing. The curing time is 1h. During the blowing process, the mandrel is filled with the mold cavity to make it fit the surface of the mold cavity. After curing, the mandrel is removed to obtain Composite products.

[0024] Wherein, in step (2), the mandrel is silica gel, the hardness is 20°, and the volume thermal expansion coefficient range of silica gel is 5.9x10 -4 / °C.

Embodiment 3

[0026] (1) Mold pretreatment: Evenly smear release wax on the surface of the negative film, then spray the gel coat resin, and let it stand until the gel coat resin solidifies;

[0027] (2) Blow molding: Wrap the prepreg on the preformed film to achieve the shape and size of the composite product, take out the preformed film, put it into the mandrel, and then put the prepreg and mandrel into the mold cavity , heated to 130°C and blowing air to the mandrel for curing. The curing time is 3 hours. During the blowing process, the mandrel is filled with the mold cavity to make it fit the surface of the mold cavity. After curing, the mandrel is removed to obtain Composite products.

[0028] Wherein, in step (2), the mandrel is silica gel, the hardness is 40°, and the volume thermal expansion coefficient range of silica gel is 7.9x10 -4 / °C.

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Abstract

The invention relates to a production method of a composite material product, in particular to a method for producing the composite material product through a blowing process. Comprising the following steps: uniformly smearing demolding wax on the surface of a female mold, then spraying gel coat resin, and standing until the gel coat resin is cured; the method comprises the following steps: wrapping a prepreg on a pre-forming film, then taking out the pre-forming film, putting a core shaft, putting the pre-forming film and the core shaft into a mold cavity, then heating, blowing air to the core shaft for curing, enabling the core shaft to fill the pre-forming film cavity in the blowing process, enabling the core shaft to be attached to the surface of the mold cavity, and removing the core shaft after curing to obtain a composite material product. According to the invention, the preforming film is firstly wrapped with the prepreg to achieve the shape and size of the composite material product, and then the mandrel is put into the prepreg and is blown, so that the overall operation is simple, the construction operation is convenient, the fitting property of the prepreg and the mold cavity is ensured, and the prepared composite material has a good forming effect.

Description

technical field [0001] The present invention relates to the production method of composite material, more specifically, relates to a method for producing composite material product by blowing process. Background technique [0002] Blow molding, also known as hollow molding, blow molding, is a manufacturing process for forming hollow plastic parts: it was initially used to form glass bottles. Generally speaking, it includes various blow molding methods such as extrusion blow molding, injection blow molding, injection stretch blow molding and bag compression molding. In the existing bag press molding process, the fiber preform is placed in the mold, covered with a soft isolation film, and cured under hot pressure. After the required curing cycle, the material forms a component with a certain structure. This kind of bag press molding method has relatively complicated process, high difficulty in operation, and it is difficult to ensure the tightness between the mold and the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/34B29C70/54
CPCB29C70/342B29C70/54
Inventor 刘成
Owner 湖北长盛复合材料科技有限公司