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A kind of preparation method of preform, fiber fabric intermediate

A technology of fiber fabrics and intermediates, applied in the direction of coating, etc., can solve the problems of RTM resin incompatibility, small fabrics, low production efficiency, etc., to improve regularity and fiber volume content, reduce the number of pressing rolls, and reduce preparation effect of difficulty

Active Publication Date: 2021-06-22
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional sizing agent often uses a solvent-based sizing agent, which uses the solvent to volatilize the fiber to harden the shape. The pre-setting treatment method is to brush the solvent-based fiber sizing agent on the fiber, and the fiber will harden after the solvent is evaporated. The amount of fiber deformation will be smaller than that of unshaped, but the viscosity of the fixed fabric is very small at room temperature. It is possible to lay a simple flat plate, but it is difficult to prepare fiber preforms for complex structural composite products, which limits the RTM. The application of technology on complex composite structural parts; and the general RTM resin is easy to penetrate into the fiber because of its low viscosity. Styling agent material report
In addition, the content of the sizing agent in the fabric after the traditional sizing method is generally (3-5)%, and the prepreg equipment cannot be used for automatic production. It can only be painted by hand, which requires a lot of manpower, resulting in very high production efficiency. Low, and in the case of a small amount, it will also lead to poor setting effect. In addition, if the content of setting agent is increased, it will not only affect the flow of RTM resin, but also appear to be incompatible with RTM resin, which will affect to a certain extent. Mechanical Properties of Composite Materials

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • A kind of preparation method of preform, fiber fabric intermediate
  • A kind of preparation method of preform, fiber fabric intermediate

Examples

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Effect test

example 1

[0035] RTM resin: 6818 high temperature curing epoxy resin system

[0036] Dry fabric: G0827 unidirectional carbon fiber fabric, surface density 165g / m 2 , fiber type T300-3k.

[0037] Step 1: Use high-temperature curing 6818RTM epoxy resin as the sizing agent material for dry fabrics, and apply 6818RTM epoxy resin to a thickness of 10g / m2±2g / m2 using the glue applicator of the hot-melt method prepreg production equipment resin film;

[0038] Step 2: Place the rolled G0827 unidirectional carbon fiber fabric on the dipping machine of the hot-melt prepreg equipment, and apply the prepared 6818RTM epoxy resin film on the surface of the dry fabric through only one pressure roller, and try to Avoid pressing the resin film into the fiber interior;

[0039] The third step: After the dry fabric is pre-impregnated, the G0827 unidirectional carbon fiber fabric intermediate that is similar to the hot-melt fabric prepreg is obtained with a release paper on one side and a plastic film o...

example 2

[0042] RTM resin: 6818 high temperature curing epoxy resin system

[0043] Dry fabric: G0827 unidirectional carbon fiber fabric, surface density 165g / m 2 , fiber type T300-3k.

[0044] Step 1: Use high-temperature curing 6818RTM epoxy resin as the sizing agent material for dry fabrics, and apply 6818RTM epoxy resin to a thickness of 20g / m2±2g / m2 using the glue applicator of the hot-melt method prepreg production equipment resin film;

[0045] Step 2: Place the rolled G0827 unidirectional carbon fiber fabric on the dipping machine of the hot-melt prepreg equipment, and apply the prepared 6818RTM epoxy resin film on the surface of the dry fabric through only one pressure roller, and try to Avoid pressing the resin film into the fiber interior;

[0046] Step 3: After the dry fabric is pre-impregnated, one side is a release paper and the other side is a plastic film, which is similar to the G0827 unidirectional carbon fiber fabric intermediate of the hot-melt fabric prepreg; th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention provides a preparation method of a preform and a fiber fabric intermediate. The method uses RTM bulk resin as a setting agent, and under the premise of not affecting the filling flow of the RTM resin, the dosage of the traditional setting agent is reduced from 3 ~5% to 10~20%, and use the hot-melt prepreg process to infiltrate the dry fabric with RTM resin, so that the obtained dry fabric intermediate has the cutting and laying manufacturability of prepreg, The deformation amount of the fiber during the preparation of the preform is reduced, the preparation quality of the fiber preform is improved, the preparation requirements of the complex structure preform are met, and the forming quality of the RTM product is finally ensured.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a preparation method of a preform and a fiber fabric intermediate, in particular to a preparation method of a preform and a fiber fabric intermediate in a composite material liquid forming process. Background technique [0002] The low-cost liquid molding process of composite materials (such as RTM, VARI, etc.) 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 main load-bearing structural parts. One of the key technologies in the composite material liquid molding process is the preparation technology of the product fiber preform. Fiber preforms require a large amount of dry carbon fiber fabrics or glass fiber fabrics. Since the fiber fabrics are not impregnated like prepregs, they are prone to deformation, resulting in fiber buckling, ply angle deflec...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B11/16B29B11/00
CPCB29B11/00B29B11/16B29B15/10
Inventor 龚文化张涛杜姝婧
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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