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Forming method for film transfer of dry fiber fabric and application thereof

A fiber fabric and film transfer technology, applied in the field of composite materials, to achieve the effects of reducing deformation, ensuring molding quality, and improving adhesion

Active Publication Date: 2019-05-03
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem of the present invention is: to overcome the deficiencies of the existing fiber fabric sizing technology, to provide a film transfer sizing method for dry fabrics in the liquid forming process, which improves the bonding force between fabric layers and greatly Significantly reduce the amount of fiber sizing agent, reduce the amount of fiber deformation during preform preparation, improve the preparation quality of fiber preform, and finally ensure the molding quality of the product

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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  • Forming method for film transfer of dry fiber fabric and application thereof
  • Forming method for film transfer of dry fiber fabric and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Styling agent material: solution type setting agent Tack328 (solution type, solid content 17%)

[0054] Fabric type: G0827 unidirectional carbon fiber fabric, surface density 165g / m 2 , fiber type T300-3k.

[0055] The first step is to weigh Tack328 sizing agent at 29.1g per square meter (the solid content is equivalent to 3% of the weight of the G0827 fabric) and evenly spray it on the release paper. After the solvent evaporates, the sizing agent will form uniform spots on the release paper Shaped or flake-shaped adhesive film;

[0056] In the second step, the rolled G0827 unidirectional carbon fiber fabric is spread along the fiber direction on the release paper coated with a sizing agent, and the sizing agent film is transferred to the surface of the dry fiber fabric through a certain contact pressure, and the fabric and the release paper Coil together and reserve;

[0057] The third step is to unfold the rolled G0827 unidirectional carbon fiber fabric that has be...

Embodiment 2

[0065] Styling agent material: bisphenol A epoxy resin and hexafluoropolyaryletherketone prepolymer (dry setting agent).

[0066] Solvent: a mixed solvent made of tetrahydrofuran and acetone at a weight ratio of 1:1.

[0067] Fabric type: G0827 unidirectional carbon fiber fabric, surface density 165g / m 2 , fiber type T300-3k.

[0068] In the first step, the dry setting agent (bisphenol A epoxy resin and hexafluoropolyaryletherketone prepolymer) is dissolved in a mixed solvent of tetrahydrofuran and acetone (weight ratio 1:1) to make a solid content of 30 % of the fixative solution.

[0069] In the second step, weigh the sizing agent solution according to the solid content equivalent to 1% of the weight of the G0827 fabric, and evenly brush it on the release paper. After the solvent evaporates, the sizing agent will form uniform dots or flakes on the release paper Adhesive film;

[0070] The third step is to spread the roll of G0827 unidirectional carbon fiber fabric on the...

Embodiment 3

[0078] Embodiment 3 (existing shaping method)

[0079] Styling agent material: solution type setting agent Tack328 (solution type, solid content 17%)

[0080] Fabric type: G0827 unidirectional carbon fiber fabric, surface density 165g / m 2 , fiber type T300-3k.

[0081] The first step is to roll out the roll of G0827 unidirectional carbon fiber fabric, weigh Tack328 sizing agent (solid content is equivalent to 6% of the weight of G0827 fabric) at 58.2 per square meter, and directly spray the sizing agent on the fiber;

[0082] The second step is to cut the fabric into 13 pieces of 300mm×300mm in size after the setting agent solvent evaporates;

[0083] The third step is to lay 13 layers of fabric layer by layer, and handle with care to avoid fiber deformation.

[0084] See Example 1 and Example 2 for the preparation method of the preform of the present invention, and Example 3 for the method for preparing the preform in the prior art.

[0085] Put the preforms prepared by t...

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 relates to a forming method for film transfer of a dry fiber fabric and application thereof. The method includes steps of covering tackifier on the upper or lower surface of a piece of release paper to obtain a release paper with an adhesive film after solvent evaporation; unfolding the dry fiber fabric on the release paper along the fiber direction and applying pressure to adhere the adhesive film to the surface of the fiber fabric; cutting the dry fiber fabric to obtain N fiber fabric with the release paper at a single side of the fiber fabric, namely the first layer of the fiber fabric, the second layer of the fiber fabric, ...and the Nth layer of the fiber fabric; applying the adhesive film of the release paper with the adhesive film to the side, without the release paper, of the first layer of the fiber fabric; and laying and covering, and then completing forming to obtain a fiber tackified preform. According to the method, the adhesive strength between layers of thefabric is improved, the dosage of fiber tackifier is reduced, the amount of fiber deformation in preform preparation is reduced, the quality of the preparation of the fiber preform is improved, and the forming quality of the product is ultimately guaranteed.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a method for film transfer and shaping of dry fiber fabrics and its application. 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 dry fiber fabrics are not impregnated like prepregs, they are prone to deformation, resulting in fiber buckling, ply angle deflection, etc., and directly affect Product preform quality and final product quality. Therefore, it is necessary to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B11/00B29C70/46
Inventor 龚文化卢山许亚洪
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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