Spacecraft shell material as well as RTM (Resin Transfer Molding) molding technology and injection molding system thereof

A shell material and injection system technology, applied in the direction of chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve problems that cannot be effectively solved, the porosity of composite material products is large, and the reliability of the overall structure is reduced. problem, to achieve the effect of improving reliability and comprehensive performance, reducing preparation cost, and enhancing multifunctionality

Inactive Publication Date: 2013-02-20
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

For ablation-resistant composite materials, the matrix resin has an important influence on the performance of the composite material, and the most important characteristic is the carbonization characteristics, that is, the carbonization rate and the firmness of the carbonized layer. In known different types of resins Among them, the carbonization rate of phenolic resin is the highest; however, the traditional phenolic resin is more brittle, and because its curing reaction is a polycondensation reaction, the reaction releases a large amount of water and small molecules, which will cause the porosity of the composite product to be relatively large. , can no longer meet the higher requirements, which has become a bottleneck restricting its application in the preparation of resin-based ablation-resistant components by RTM
[0005] In addition, the traditional RTM process can only inject a single resin. For the above-mentioned spacecraft shell composite components with multi-functional layers, the ...

Method used

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  • Spacecraft shell material as well as RTM (Resin Transfer Molding) molding technology and injection molding system thereof
  • Spacecraft shell material as well as RTM (Resin Transfer Molding) molding technology and injection molding system thereof
  • Spacecraft shell material as well as RTM (Resin Transfer Molding) molding technology and injection molding system thereof

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Embodiment

[0033] Embodiment: spacecraft cabin shell and RTM molding thereof.

[0034] a kind of like image 3 As shown in the spacecraft cabin shell of the present invention, the outer layer of the spacecraft cabin shell needs to bear aerodynamic heat, and needs to have functions such as heat resistance, high temperature resistance, and ablation resistance, and the inner layer is mainly used for carrying and receiving Force, must have good mechanical properties. The shell material in this embodiment is mainly composed of an inner layer composite material and an outer layer composite material. The inner layer composite material is made of E-44 epoxy resin (purchased from Yueyang Baling Petrochemical Co., Ltd.) and aromatic amine GA-327 The curing agent (purchased from Jiangsu Yixing Jiangnan Medical Chemical Factory) system is the inner matrix, in which, the viscosity of E-44 epoxy resin is lower than 800mPa·s in the temperature range of 60℃~90℃, and the viscosity is below 800mPa·s T...

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Abstract

The invention discloses a spacecraft shell material which mainly consists of an inner composite material and an outer composite material, wherein the inner composite material takes an epoxy resin and aromatic amine curing agent system as matrix; the outer composite material takes benzoxazine resin as matrix; the transition between the inner and outer composite materials is realized through a polysulfone membrane; and the shell material is prepared by carrying out simultaneous injection and synchronous curing through an RTM (Resin Transfer Molding) technology: an injection molding system is prepared, then an overlapped fiber pre-molding body is prepared, preheating is carried out on the resin in two injection systems, and simultaneous injection, synchronous curing, demolding and finishing are carried out to obtain the spacecraft shell material. The injection molding system comprises a die, a first injection system, a second injection system, a first vacuum pumping system and a second vacuum pumping system; and a polysulfone membrane is arranged in a die cavity to divide the die cavity into an inner die cavity and an outer die cavity. The spacecraft shell material has the advantages of few technology steps, low equipment investment, low cost, high efficiency, benefit to integral molding and the like.

Description

technical field [0001] The invention relates to a fiber-reinforced composite material and its molding preparation process, in particular to a composite material with a multifunctional layer and its RTM molding process. Background technique [0002] Low-pressure liquid molding technology (Liquid Composite Molding, referred to as LCM) is a molding process widely used in the preparation of large-scale composite components, which refers to injecting liquid polymer into a closed cavity with fiber preforms, or heating and melting The resin film pre-placed in the mold cavity, the liquid polymer completes the infiltration of the resin / fiber while flowing and filling the mold, and is cured and formed into a type of preparation technology. Resin transfer molding (Resin Transfer Molding, hereinafter referred to as RTM) and resin film infiltration (Resin Film Infusion, hereinafter referred to as RFI) are the most common advanced LCM technology. LCM process technology can impregnate and...

Claims

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Application Information

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IPC IPC(8): B32B27/38B29C70/48
Inventor 尹昌平曾竟成肖加余江大志刘钧边立平
Owner NAT UNIV OF DEFENSE TECH
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