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Fiber composite material and method for producing same by virtue of RTM forming method

A fiber composite material and a molding method technology, which are applied in the field of fiber composite materials and the production of the composite material by using the RTM molding method, can solve the problem that the batch setting processing requirements cannot meet the production process requirements of hot-melt prepregs, and the viscosity is low and cannot be formed into a film. and other problems, to achieve the effect of large-scale stereotype processing, meeting the requirements of the injection process, and good viscosity

Active Publication Date: 2018-04-20
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems that the traditional RTM epoxy resin has low viscosity and cannot form a film, and cannot meet the production process requirements of hot-melt prepregs and the batch-setting processing requirements of dry fabric intermediates, the present invention provides a fiber composite material produced by RTM molding method The method, the epoxy resin in this method can be used for batch setting treatment of dry fabrics, and can also be used for RTM injection process

Method used

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  • Fiber composite material and method for producing same by virtue of RTM forming method
  • Fiber composite material and method for producing same by virtue of RTM forming method
  • Fiber composite material and method for producing same by virtue of RTM forming method

Examples

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Effect test

Embodiment 1

[0048] The preparation raw materials used include: 30% bisphenol A cyanate resin, 30% novolac epoxy resin and 40% bisphenol A epoxy resin. It should be noted that the percentage content here refers to the percentage of the mass of the components in the total mass of the raw materials for preparation. The percentages mentioned below (including Table 1) all have this meaning.

[0049] Dry fabric selection: G0827 unidirectional carbon fiber fabric with an area density of 165g / m 2 , fiber type T300-3k.

[0050] The above-mentioned bisphenol A type cyanate resin and epoxy resin were fully stirred evenly at room temperature with a double planetary mixer. Grind the mechanically stirred resin system through a three-roll mill, control the resin temperature not to exceed 60°C, minimize the melting of cyanate powder, and make the bisphenol A cyanate resin uniformly dispersed in the form of solid powder in the epoxy resin. in the resin. Grind three times to obtain a bisphenol A cyanat...

Embodiment 9

[0054] The preparation raw materials used are the same as in Example 1, and the production method is different from Example 1 as follows: the first temperature is 90°C.

Embodiment 10

[0056] The preparation raw materials used are different from those in Example 1, and there are the following differences: 43% novolac epoxy resin+57% bisphenol A epoxy resin, excluding cyanate resin. Production method with reference to Example 1.

[0057] The application effects of the above-mentioned embodiments were evaluated, and the results are shown in Table 1. As can be seen from Table 1, for the bisphenol A type cyanate ester / epoxy resin system of different proportions, as long as the mixing temperature (i.e. the first temperature) and the dispersion temperature (i.e. the second temperature) are well controlled, the reduction of bisphenol The melting amount of A-type cyanate, so that part or all of bisphenol A-type cyanate is dispersed in the epoxy resin in the form of solid powder, and a one-component RTM epoxy that is solid or semi-solid at room temperature can be obtained. Resin system can meet the batch setting processing requirements of dry fabrics. When the resi...

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Abstract

The invention relates to a fiber composite material and a method for producing the same by virtue of an RTM forming method. The method comprises the following steps: dispersing a cyanate ester resin powder into epoxy resin at a first temperature to prepare mixed resin; heating the mixed resin to achieve a second temperature, and then coating the surface of a dry fabric with the mixed resin to obtain a dry fabric intermediate; preparing a preform from the dry fabric intermediate; and placing the preform into a die cavity of an RTM forming die, closing the die, then injecting the mixed resin ata third temperature, and carrying out cutting forming, die release and aftertreatment to obtain the fiber composite material, wherein the first temperature is lower than the melting point of the cyanate ester resin; the second temperature is lower than the melting point of the cyanate ester resin; and the third temperature is higher than the melting point of the cyanate ester resin. The resin system in the method can be used for batch shaping treatment for the dry fabrics, and further meets the requirements of a glue injection process for an RTM composite material with a high fiber volume content.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a fiber composite material and a method for producing the composite material by using an RTM molding method. Background technique [0002] The liquid forming process of composite materials has been widely used in various technical fields of composite materials, and has gradually developed from the production of secondary load-bearing structural parts to the production of main load-bearing structural parts. In the liquid molding process of composite materials, there is a key technology, which is the preparation process of fiber preforms. Fiber preforms require a large amount of dry fiber fabrics (such as dry carbon fiber fabrics or dry glass fiber fabrics). The dry fiber fabrics used are not impregnated like prepregs, so they are prone to deformation, resulting in Fiber buckling, ply angle deflection, etc., will directly affect the quality of the preform an...

Claims

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Application Information

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IPC IPC(8): B29C70/48B29C70/54
CPCB29C70/48B29C70/54
Inventor 龚文化杜姝婧许亚洪
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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