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Technical method using low resin content prepreg for preparation of composite material

A technology of resin content and composite materials, which is applied in the field of low-cost manufacturing of high-performance composite materials, can solve the problems of time-consuming autoclave molding process, poor manufacturing flexibility, and high manufacturing costs, so as to achieve good paving manufacturability and reduce defects probability, the effect of high fiber alignment

Inactive Publication Date: 2014-07-16
AVIC COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the prepreg autoclave forming process, it is more applied to the preparation of large-area wall panels, and for some integral composite components with complex structures, its manufacturing flexibility is poor. At the same time, the autoclave molding process is time-consuming, energy-consuming, and the manufacturing cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0020] A typical RTM high-temperature epoxy resin was selected as the matrix resin, and it was prepolymerized at 160°C for 30 minutes to obtain a prepreg grade resin matrix, which was dissolved in acetone to prepare a resin solution with a solution concentration of 25%wt. The domestic CCF300 carbon fiber was selected as the reinforcement, and the low resin content prepreg was prepared by wet prepreg process, and the resin content was 18%wt. follow [0] 16 The lay-up method is to complete the laying of the preform, place it in the closed mold for RTM molding, close the mold and compress it to a thickness of 2mm, and under the pressure of 0.2MPa, inject RTM high-temperature epoxy resin until the preform is completely infiltrated Then heat up and solidify. Wherein, the injection process parameters and the curing process parameters are the same as the process parameters of the selected resin. After curing, cool to room temperature, demould, and finally obtain the composite materi...

specific Embodiment 2

[0021] A typical RTM high-temperature epoxy resin was selected as the matrix resin, and it was prepolymerized at 160°C for 30 minutes to obtain a prepreg grade resin matrix, which was dissolved in acetone to prepare a resin solution with a solution concentration of 30%wt. U3160 domestic carbon fiber unidirectional laid fabric was selected as the reinforcement, and the low resin content prepreg was prepared by wet prepreg process, and the resin content was 20%wt. According to [45 / -45] 3s The lay-up method is to complete the laying of the preform, place it in the closed mold for RTM molding, close the mold and compress it to a thickness of 2mm, and under the pressure of 0.2MPa, inject RTM high-temperature epoxy resin until the preform is completely infiltrated Then heat up and solidify. Wherein, the injection process parameters and the curing process parameters are the same as the process parameters of the selected resin. After curing, cool to room temperature, demould, and fi...

specific Embodiment 3

[0022] A typical RTM bismaleimide resin was selected as the matrix resin, and it was prepolymerized at 130°C for 90 minutes to obtain a prepreg grade resin matrix, which was dissolved in acetone to prepare a resin solution with a solution concentration of 25%wt. CF3031 domestic carbon fiber twill fabric was selected as the reinforcement, and the low resin content prepreg was prepared by wet prepreg process, and the resin content was 15%wt. follow [0] 9 The lay-up method is to complete the laying of the preform, place it in the closed mold for RTM molding, close the mold and compress it to a thickness of 2mm, and inject RTM bismaleimide resin into the preform under the pressure of 0.2MPa After the body is fully infiltrated, the temperature rises and solidifies. Wherein, the injection process parameters and the curing process parameters are the same as the process parameters of the selected resin. After curing, cool to room temperature, demould, and finally obtain the composit...

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Abstract

The invention belongs to the technical field of low-cost manufacturing of high performance composite materials, and relates to a technical method using a low resin content fiber-reinforced prepreg for preparation of a composite material. First of all, resin content in the prepreg can be regulated by precise control of the concentration of a resin solution in a wet-method prepreg preparing process, and under the premises of ensuring structural integrity and technical operability of the prepreg, fiber tows are partly wetted with resin to obtain the low resin content prepreg; then by combination with a mold-closing RTM (resin transfer molding) technology and in dependence on injection and flowing of low viscosity RTM resin, the reinforced fiber can be finally and completely wetted to obtain the high performance composite material which has good paving technical properties and high fiber collimation degree and fiber volume fraction of both the prepreg and the composite material and can combine manufacturing flexibility of the RTM technology.

Description

technical field [0001] The invention belongs to the technical field of low-cost manufacturing of high-performance composite materials, and relates to a process method for preparing composite materials by using low-resin-content prepregs. Background technique [0002] At present, in the field of composite material manufacturing technology, the traditional prepreg autoclave molding process is widely used. Prepregs with high fiber alignment can be obtained by pre-combining resin and reinforcing fibers. After the autoclave molding process can be Preparation of composites with excellent mechanical properties with higher fiber volume fractions. However, for the prepreg autoclave forming process, it is more applied to the preparation of large-area wall panels, and for some integral composite components with complex structures, its manufacturing flexibility is poor. At the same time, the autoclave molding process is time-consuming, energy-consuming, and the manufacturing cost is re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/48
CPCB29C70/48
Inventor 刘刚李伟东包建文
Owner AVIC COMPOSITES
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