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A kind of preparation method of recycled carbon fiber prepreg

A technology for recycling carbon fiber and prepreg, which is applied in the direction of coating, etc., can solve the problems of high-performance application of carbon fiber, easy fiber extraction from the matrix, and low mechanical strength of composite materials, so as to reduce material costs and prevent fiber The effect of orientation damage and good mechanical properties

Active Publication Date: 2020-06-26
BEIJING UNIV OF CHEM TECH +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] With the development of carbon fiber recycling technology, more and more carbon fibers are recycled in the form of chopped carbon fibers. However, the reinforcement ability of recycled chopped carbon fibers is much lower than that of continuous fibers, mainly because the recycled chopped carbon fibers in the matrix are in the form of no carbon fibers. Regular distribution, can not become a continuous body bearing stress in the direction of stress, the fiber is easy to pull out or break from the matrix
For example, Chinese patent 201410398098.0 discloses a carbon fiber reinforced thermoplastic resin composite material and its preparation method [Yang Bin, Wang Xinling, Zhang Yuanyuan, et al. Carbon fiber reinforced thermoplastic resin composite material and its preparation method:, CN 104194286 A[P].2014.], The method of directly adding chopped carbon fiber to the injection molding machine improves the mechanical strength and thermal conductivity of PBT resin, but the improvement of mechanical properties is limited.
Chinese patent CN201310672545.2 discloses a preparation method of sheet molding compound [Sheng Jiangfeng, Wang Yunming, Zhang Rui, etc. Preparation method of carbon fiber prepreg:, CN104708836A[P].2015.], which uses chopped carbon fiber as Reinforcement, the chopped carbon fiber is evenly spread between the paste to prepare a sheet molding compound sheet. The carbon fiber in this product is also randomly distributed, and the mechanical strength of the composite material is still low.
In order to achieve a better infiltration effect, the hot pressing roller exerts greater pressure on the fiber-resin; and this prepreg needs to be subjected to greater pressure in the later stage of composite material preparation and molding to remove the volatile matter that escapes during the curing process. Porosity caused, so the existing technology cannot solve the problem of high performance application of recycled carbon fiber in chopped form

Method used

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  • A kind of preparation method of recycled carbon fiber prepreg
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  • A kind of preparation method of recycled carbon fiber prepreg

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preparation example Construction

[0017] A kind of preparation method of recycled carbon fiber prepreg of the present invention specifically comprises the following steps:

[0018] Heat the thermosetting resin and coat it directly on the recycled carbon fiber cloth, where the coating temperature is 60-100°C, the viscosity of the resin is 2-4Pa·s when coating, and the tension applied to the fiber cloth is 0.1-0.5cN / tex, the fiber cloth feeding speed is 2-3m / min, the resin coating speed is 1.8-2.7m / min, the fluidity of the resin during coating is used to make the resin impregnate the fiber cloth initially, and the resin and fiber cloth are pre-composited and merged. Ensure fiber cloth orientation;

[0019] The pre-composite product of recycled carbon fiber cloth and resin film is further impregnated with an impregnation machine to prepare recycled carbon fiber prepreg; wherein, the tension applied to the fiber-resin pre-composite product is 0.5-2cN / tex, and the impregnation process speed is 5 -6m / min, and use ...

Embodiment 1

[0025] A thermosetting resin component comprising the following parts by mass is used: bisphenol A epoxy resin, 100 parts; diethyltoluenediamine, 40 parts. A recycled carbon fiber oriented cloth with an area density of 10gsm (area density variance of 0.2), a fiber orientation of 80%, and a weight ratio of recycled carbon fiber to dispersant of 97:3, wherein the fiber length is 6mm, and the dispersant is methyl cellulose , the degree of cross-linking is 10%.

[0026] Prepare recycled carbon fiber prepregs as follows:

[0027] Heat the thermosetting resin with a hot-melt coater and coat it directly on the recycled carbon fiber cloth, where the coating temperature is 60 °C, the viscosity of the resin is 2 Pa s during coating, and the tension applied to the fiber cloth is 0.1 cN / tex, the feeding speed of the fiber cloth is 2m / min, and the resin coating speed is 1.8m / min, so that the resin is preliminarily impregnated with the fiber cloth, so as to realize the pre-composite of th...

Embodiment 2

[0031] A thermosetting resin component comprising the following parts by mass is used: thermosetting phenolic resin, 100; hexamethylenetetramine, 30. A recycled carbon fiber oriented cloth with an area density of 80gsm (area density variance of 0.5), a fiber orientation degree of 85%, and a weight ratio of recycled carbon fiber to dispersant of 97:3, wherein the fiber length is 4mm, and the dispersant is dopamine, cross-linked The degree is 30%.

[0032] Prepare recycled carbon fiber prepregs as follows:

[0033] Heat the thermosetting resin with a hot-melt coater and coat it directly on the recycled carbon fiber cloth, where the coating temperature is 80 °C, the viscosity of the resin is 2.5 Pa s during coating, and the tension applied to the fiber cloth is 0.2 cN / tex, the feeding speed of the fiber cloth is 2.5m / min, and the resin coating speed is 2.3m / min, so that the resin is preliminarily impregnated with the fiber cloth, so as to realize the pre-composite of the resin ...

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Abstract

A preparation method of a recycled carbon fiber prepreg belongs to the field of preparation and molding processes of composite materials. A thermosetting resin is used as a matrix, and a recycled carbon fiber cloth composed of a carbon fiber and a bio-based organic matter dispersant is used as a reinforcement, wherein the recycled carbon fiber is distributed in the carbon fiber cloth in an oriented manner in a chopped form, and the bio-based organic matter dispersant improves the wetting property of the recycled carbon fiber and the interface combination of the recycled carbon fiber and the resin. The recycled carbon fiber prepreg with an impregnation degree of 20-40% is prepared by a two-step impregnation technique through adjusting the suitable impregnation temperature and the suitable impregnation speed, the prepreg preparation method suitable for chopped recycled carbon fibers is opened up, and the secondary efficient utilization of the recycled carbon fibers is realized.

Description

technical field [0001] The invention belongs to the field of composite material preparation and molding technology, and relates to a preparation method for preparing prepreg by using recycled carbon fibers. Background technique [0002] Carbon fiber reinforced thermosetting resin-based composites have many advantages, such as corrosion resistance, fatigue resistance, high specific strength and specific modulus, good thermal stability and designability, and are widely used in aerospace, automotive industries and wind power. industry and other fields. With the large-scale use of carbon fiber composites, the recycling of carbon fiber reinforced thermosetting resin composites has attracted more and more attention from industry and academia. [0003] With the development of carbon fiber recycling technology, more and more carbon fibers are recycled in the form of chopped carbon fibers. However, the reinforcement ability of recycled chopped carbon fibers is much lower than that o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/24C08L63/00C08L61/06C08L79/08C08L79/04C08L1/28C08K7/06C08K5/092C08K5/18B29B15/12
CPCB29B15/125C08J5/24C08J2361/06C08J2363/00C08J2379/04C08J2379/08C08J2401/28C08J2479/04C08K5/092C08K5/18C08K7/06
Inventor 贾晓龙还献华罗锦涛燕吉强杨小平
Owner BEIJING UNIV OF CHEM TECH
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