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A kind of non-autoclave molding prepreg preparation method

An autoclave forming and prepreg technology, applied in the field of high-performance composite material preparation, can solve the problems of low sheet performance and high porosity, and achieve the effect of improving performance and reducing porosity

Active Publication Date: 2018-02-06
HENGSHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a prepreg preparation method for non-autoclave molding, which solves the problems of low performance and high porosity of plates prepared by traditional prepregs using non-autoclave technology

Method used

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  • A kind of non-autoclave molding prepreg preparation method

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Embodiment 1

[0018] Select a high-temperature epoxy resin system, adjust the resin formulation, study the rheological properties and gel time of the resin, so that it has higher viscosity at low temperature and lower viscosity at high temperature, for example, at 70°C-80°C It has a viscosity of 100Pa.s-400Pa.s at 120°C-130°C and a viscosity of 5Pa.s-10Pa.s at 120°C-130°C, so as to ensure that there are some dry fibers in the prepreg produced during the curing process. The resin can fully flow out of the gas; at the same time, the resin has a longer gel time at high temperature, such as 120min-140min at 130°C, to ensure that the resin has enough time to release the gas before curing. The prepreg uses carbon fiber fabric as a reinforcement, and the surface density of the carbon fiber fabric is 220gsm, and the total ratio of carbon fiber fabric to resin is 6:4. Choose a viscosity of 220Pa.s, and adopt a coating process to prepare a single-sided adhesive film when the temperature is lower than...

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Abstract

The invention discloses a method for preparing presoak materials for forming a non-hot-pressing tank. The method for preparing the presoak materials comprises the steps that firstly the basic performance such as viscosity and gelation time of resin is adjusted so that the resin can be applicable to the presoak materials of the non-hot-pressing tank technology; secondly, the infiltration degree of dry fiber by the resin is controlled through a single-face film impregnation method, and therefore the dry fiber is made to exist in a presoak material layer. Air can be exhausted effectively through the channel in the curing process, then the porosity is reduced, and the performance of composite material products is improved.

Description

technical field [0001] The invention belongs to the technical field of high-performance composite material preparation, and relates to a prepreg preparation method suitable for non-autoclave molding. Background technique [0002] Composite materials have a series of advantages such as high specific strength and high specific modulus, fatigue resistance, corrosion resistance, designability, and good molding process, so they are widely used in aerospace vehicles. At present, autoclave prepreg molding technology is mostly used in the field of composite material manufacturing technology, but its high molding process cost and the limitation of autoclave size restrict the expansion of its application scope to a certain extent. In order to reduce costs, non-autoclave prepreg molding technology came into being. The non-autoclave prepreg molding technology, that is, the material curing molding only needs to provide a vacuum pressure, and this is the difficulty that the non-autoclave...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/50B29C70/54
CPCB29C70/504B29C70/54
Inventor 徐辰陈帅金单瑞俊吴国庆
Owner HENGSHEN