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High-modulus hot-melt prepreg and preparation method thereof

A prepreg and high-modulus technology, applied in the field of high-modulus hot-melt prepreg and its preparation, can solve the problems of substandard prepreg apparent quality, a large number of hairs, broken wires, loss of mechanical properties, etc., and achieve smoothness Good performance and quality stability, reduced fiber modulus, and improved strength loss

Pending Publication Date: 2022-02-25
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The existing equipment for preparing high-modulus hot-melt prepregs is mainly high-strength prepreg preparation equipment. During the preparation of high-modulus fiber prepregs, a large number of hairs and broken filaments are prone to occur, resulting in gaps and hairballs in the prepregs. The phenomenon that the apparent quality is not up to standard, and the mechanical properties are also lost

Method used

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  • High-modulus hot-melt prepreg and preparation method thereof
  • High-modulus hot-melt prepreg and preparation method thereof
  • High-modulus hot-melt prepreg and preparation method thereof

Examples

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Embodiment 1

[0033] In this embodiment, the hot-melt resin matrix is ​​selected from epoxy resin, the high-modulus fiber is selected from M40X carbon fiber, and the modulus is higher than 380GPa.

[0034] (1) Adhesive film preparation: use the coating process to make epoxy resin into the upper and lower adhesive films. The coating film parameters are: coating film temperature 60-80 ℃, coating film speed 5-15m / min, and the surface density is 18-22g / m 2 film.

[0035] (2) Yarn threading and spreading of high-modulus fibers: fully unfold and flatten the M40X carbon fibers through threading and spreading; ≤60°, the angle is adjusted by the position of the creel and the position of the fiber hanging), to reduce the friction between it and the equipment parts, so that the M40X carbon fiber does not appear hair balls and broken filaments during the yarn threading process; secondly, if figure 1 As shown, the high-modulus fiber 1 (M40X carbon fiber) is made to pass through several groups of spre...

Embodiment 2

[0039] In this embodiment, the hot-melt resin matrix is ​​selected from epoxy resin, the high-modulus fiber is selected from M55J carbon fiber, and the modulus is higher than 540GPa.

[0040] (1) Film preparation: use the coating process to make epoxy resin into the upper and lower film, the film parameters are: film temperature 60-80 ℃, film speed 5-15m / min, and the surface density is 23-29g / m 2 film.

[0041] (2) Yarn threading and spreading of high-modulus fibers: fully unfold and flatten the M55J carbon fibers through threading and spreading. ≤45°, the angle is adjusted by the placement position of the creel and the yarn hanging position of the fiber), to reduce the friction between it and the equipment parts, so that the M55J carbon fiber does not appear hairballs and broken filaments during the yarn threading process; secondly, the M55J carbon fiber is sequentially Through several groups of spreading combs and spreading rollers, in each set of spreading combs and spre...

Embodiment 3

[0045] In this embodiment, the hot-melt resin matrix is ​​selected from cyanate resin, the high-modulus fiber is selected from M55J carbon fiber, and the modulus is higher than 540GPa.

[0046] (1) Preparation of adhesive film: Use cyanate resin to make upper and lower adhesive films by coating process. The coating parameters are: coating temperature 50-70°C, coating speed 5-15m / min, and the surface density is 38- 42g / m 2 film.

[0047] (2) Yarn threading and spreading of high-modulus fibers: fully unfold and flatten the M55J carbon fibers through threading and spreading. ≤45°, the angle is adjusted by the placement position of the creel and the yarn hanging position of the fiber), to reduce the friction between it and the equipment parts, so that the M55J carbon fiber does not appear hairballs and broken filaments during the yarn threading process; secondly, the M55J carbon fiber is sequentially Through several groups of spreading combs and spreading rollers, in each set of...

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Abstract

The invention discloses a preparation method of a high-modulus hot-melt prepreg. The preparation method comprises the following steps: (1) preparing a hot-melt resin matrix into an upper adhesive film and a lower adhesive film by using a film coating process; (2) controlling threading and spreading processes of high-modulus fibers to fully spread and flatten the high-modulus fibers; and (3) respectively attaching the upper and lower adhesive films to the two side surfaces of the high-modulus fiber layer, and carrying out hot-pressing impregnation to obtain the high-modulus hot-melt prepreg. According to the method, the fiber modulus and strength loss are reduced and the manufacturability of prepreg preparation is improved mainly by controlling the yarn withdrawing tension in the yarn spreading process, and the method has the advantages of being low in cost, simple in process, low in equipment requirement, easy to operate and the like, is suitable for high-modulus carbon fibers of various models and adaptive thermosetting resin, is suitable for large-scale popularization and application, and the prepared high-modulus hot-melt prepreg is good in smoothness and quality stability. The method disclosed by the invention has good application value and economic benefit in the technical field of high-performance composite material manufacturing.

Description

technical field [0001] The invention relates to the technical field of high-performance fiber composite materials, in particular to a high-modulus hot-melt prepreg and a preparation method thereof. Background technique [0002] With the country's increasing demand for lightweight, the new generation of aerospace vehicles uses a large number of fiber-reinforced resin-based composite materials as load-bearing structures. High-stiffness composite materials require the preparation technology of high-modulus prepregs to meet the design requirements of high-modulus fiber composites. The resin matrix of the prepreg is impregnated with continuous fibers or fabrics under strictly controlled conditions to make a composition of resin matrix and reinforcement, which is a semi-finished material. [0003] Carbon fiber refers to inorganic material fibers with a carbon fiber content of more than 90%. It has excellent properties such as low density, light weight, high strength and high modu...

Claims

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Application Information

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IPC IPC(8): C08J5/24C08L63/00C08K7/06
CPCC08J5/24C08J2363/00C08K7/06Y02T50/40
Inventor 于水鑫张永刚李莹莹金璐王大程王飘飘
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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