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Preparation method of gradient prepreg with air guiding passage in layer

A prepreg, gradient technology, applied in the coating and other directions, can solve the problems of limiting the promotion and application of composite materials, high molding process costs, collapsed vacuum bag rupture, etc., so as to reduce the risk of collapse and vacuum bag rupture, and reduce process costs. , Improve the effect of surface viscosity

Inactive Publication Date: 2015-05-27
AVIC BASIC TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for the autoclave molding process, the high cost of the molding process limits the further promotion and application of composite materials
In addition, since the autoclave molding process generally uses a large molding pressure to exclude the gas trapped between the composite material layers during the prepreg laying process, this undoubtedly increases the risk of core material collapse and vacuum bag rupture

Method used

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  • Preparation method of gradient prepreg with air guiding passage in layer

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0023] Select a typical high-temperature epoxy resin system to study its rheological properties, select the temperature point corresponding to the viscosity of 150Pa·s as the preparation temperature of the resin film, and the surface density of the single-sided film is 35.8g / m 2 . The domestic carbon fiber CCF300 is selected as the reinforcement, and the fiber surface density is 133g / m 2 . The resin content in the prepreg is about 35%. The composite operation of the gradient prepreg is carried out at 75°C. At this time, the viscosity of the adhesive film is about 100Pa·s, and the pressure of the pressing roller is adjusted to 0.4MPa, and then the preparation of the gradient prepreg with the function of air guiding is completed.

specific Embodiment 2

[0024] Select a typical high-temperature double-horse resin system to study its rheological properties, select the temperature point corresponding to the viscosity of 140Pa·s as the preparation temperature of the resin film, and the surface density of the single-sided film is 39.0g / m 2 . The domestic carbon fiber CCF800 is selected as the reinforcement, and the fiber surface density is 145g / m 2 . The resin content in the prepreg is about 35%. The composite operation of the gradient prepreg is carried out at 110°C. At this time, the viscosity of the adhesive film is about 90Pa·s, and the pressure of the pressing roller is adjusted to 0.3MPa, and then the preparation of the gradient prepreg with the function of air guiding is completed.

specific Embodiment 3

[0025] Select a typical cyanate resin system, study its rheological properties, select the temperature point corresponding to the viscosity of 150Pa·s as the preparation temperature of the resin film, and the surface density of the single-sided film is 76.7g / m 2 . The domestic quartz fiber fabric QW280 is selected as the reinforcement, and the fiber surface density is 285g / m 2 . The resin content in the prepreg is about 35%. The composite operation of the gradient prepreg is carried out at 100°C. At this time, the viscosity of the adhesive film is about 110Pa·s, and the pressure of the pressing roller is adjusted to 0.5MPa, and then the preparation of the fabric gradient prepreg with air guiding function is completed.

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Abstract

The invention belongs to the technical field of the low-cost preparation of high-performance composite materials and relates to a gradient prepreg having an air guiding function in layer and good process operability and a preparation method of the gradient prepreg. The compound technology parameters in a prepreg preparation process are regulated and controlled, the dipping degree of resin to dry fibers is controlled, the resin is symmetrically distributed in a gradient manner in the middle layer in the thickness direction of the prepreg, the fiber is infiltrated, meanwhile, an air exhaust channel is pre-formed in a prepreg layer, and the gradient prepreg with an air guiding passage in layer can be prepared; the gradient prepreg can be formed and solidified by an out-of-autoclave process, and the forming process cost of the composite material parts can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of low-cost preparation of high-performance composite materials, and relates to a preparation method of a gradient prepreg with an inner gas-conducting passage. Background technique [0002] Advanced composite materials are widely used in the aerospace field due to their high specific strength, specific stiffness, excellent corrosion resistance, fatigue characteristics and structural designability. At present, in the field of composite material manufacturing technology, the traditional prepreg autoclave molding process is the most widely used. Prepregs with high fiber alignment are obtained by pre-compounding the matrix resin and reinforcing fibers. After the autoclave molding process Composite materials with excellent mechanical properties with higher fiber volume fractions can be prepared. [0003] However, for the autoclave forming process, the high cost of the forming process limits the further populari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B15/12
Inventor 李伟东刘刚包建文钟翔屿张代军
Owner AVIC BASIC TECH RES INST
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