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Method for preparing thermoplastic pre-impregnated fabric through radiation heating

A technology of radiant heating and radiant heater, which is applied in the direction of coating, etc., can solve the problems of low production efficiency, affecting composite material products, and slow fiber transmission speed, so as to save solvent volatilization process, high impregnation uniformity, and avoid solvent doping effect

Pending Publication Date: 2018-08-21
SHANDONG ZHONGHENG CARBON FIBER TECH DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The liquid-phase impregnation method in the above-mentioned existing method introduces a large amount of solvent during the forming process of the prepreg fabric, which is not easy to be removed by subsequent drying, which affects the final overall performance of the composite product. At the same time, the drying device in the process of removing the solvent is also It brings a lot of energy consumption, which undoubtedly increases a lot of production costs. At the same time, the fiber transmission speed is relatively slow in the production process of the liquid phase impregnation method, and the production efficiency is low.
[0005] In summary, the existing methods for preparing composite prepreg fabrics still have problems such as high energy consumption and low production efficiency. Therefore, it is necessary to develop a new method for preparing composite prepreg fabrics.

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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  • Method for preparing thermoplastic pre-impregnated fabric through radiation heating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A thermoplastic prepreg fabric formed by radiation heating, melting and impregnation, in which the thermoplastic high-melting hybrid matrix layer on the upper surface is made of polyamide fiber mixed with T300 carbon fiber, and the mixing ratio is 1:1, and the mixed fabric is laid on the middle reinforcing fiber fabric layer surface. A middle fabric layer with a thickness of 0.05 mm was prepared using unidirectional carbon fibers. The thermoplastic high-melt hybrid matrix layer on the lower surface is a hot-melt adhesive film with a thickness of 0.5mm prepared by mixing polyethylene resin with a length of 2cm and chopped T800 carbon fiber, wherein the doping ratio of chopped T800 carbon fiber is 30%. Lay the base adhesive film layer on the lower surface of the middle fabric layer.

[0038] The carbon fiber heating element is used as the configuration heating body to radiate the pressure roller body. The heating power is 1000W, the surface temperature is controlled at 1...

Embodiment 2

[0040] A thermoplastic prepreg fabric formed by radiation heating, melting and impregnation, in which the thermoplastic high-melting hybrid matrix layer on the upper surface is made of polyurethane fiber mixed with T300 carbon fiber, and the mixing ratio is 4:1, and the mixed fabric is laid on the upper surface of the middle reinforcing fiber fabric layer . A middle fabric layer with a thickness of 0.05 mm was prepared using plain-weave E-glass fibers. The thermoplastic high-melt hybrid matrix layer on the lower surface is a hot-melt adhesive film with a thickness of 0.2mm prepared by mixing polypropylene resin with a length of 4cm and chopped T700 carbon fiber, wherein the doping ratio of chopped T700 carbon fiber is 35%. Lay the base adhesive film layer on the lower surface of the middle fabric layer.

[0041] The far-infrared ceramic heating element is used as the configuration heating body to radiate the pressure roller body, the heating power is 15000W, the surface tempe...

Embodiment 3

[0043]A thermoplastic prepreg fabric formed by radiation heating, melting and impregnation, in which the thermoplastic high-melting hybrid matrix layer on the upper surface is made of polypropylene fiber mixed with T300 carbon fiber, the mixing ratio is 2:1, and the mixed fabric is laid on the middle reinforcing fiber fabric layer surface. The middle fabric layer with a thickness of 0.09 mm was prepared by using UHMWPE fibers with a three-dimensional four-way three-dimensional structure. The thermoplastic high-melt hybrid matrix layer on the lower surface is a hot-melt adhesive film with a thickness of 0.09mm prepared by mixing acrylic copolymer resin with a length of 6cm and chopped T300 carbon fiber, wherein the doping ratio of chopped T300 carbon fiber is 36%. Lay the base adhesive film layer on the lower surface of the middle fabric layer.

[0044] The carbon fiber heating element is used as the configuration heating body to radiate the pressure roller body, the heating p...

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Abstract

The invention relates to a method for preparing a thermoplastic pre-impregnated fabric through radiation heating and belongs to the field of composite pre-impregnated fabric preparation. The method comprises the steps that (1) a top surface thermoplastic high-melting mixed matrix layer, a middle reinforced fiber fabric layer and a lower surface thermoplastic high-melting mixed matrix layer are laid in sequence to form a composite layer of a top-middle-bottom structure; (2) the composite layer obtained in the step (1) is placed between two opposite pressurization rollers provided with radiationheaters, and continuous preparation of the pre-impregnated fabric is completed through rotation of roller bodies and radiation heating. By means of a radiation heating method combined with a high-melting high-flow hot melt impregnation layer and the fiber fabric layer, the pressurization process, the heating process and the impregnation process are implemented synchronously under the action of the opposite pressurization rollers. Through the preparation process, solvent doping is avoided, and the subsequent solvent volatilization process is omitted. Meanwhile, the instant radiation heating temperature is high, the thermal inertia is small, the comprehensive production efficiency is high, and energy consumption for preparing the pre-impregnated fabric is reduced substantially.

Description

technical field [0001] The invention belongs to the field of preparation of composite prepreg fabrics, in particular to a method for preparing thermoplastic prepreg fabrics by radiation heating. Background technique [0002] Composite prepreg fabric is a key intermediate product for the preparation of high-performance composite materials, and the quality of the prepreg fabric, uniformity of fiber reinforcement, and uniformity of resin impregnation are key indicators to ensure the final composite material molding. The traditional composite material prepreg fabric After the liquid-phase resin is used to impregnate fiber filaments or fiber multi-dimensional fabrics, they are spread, pressurized and heated. For example, patent application 201610371327.9 discloses a method for preparing prepregs, which includes the following steps: forming a mixture of at least two fiber materials. The woven fabric layer is formed; the two sides of the woven fabric layer are sandwiched by a resin...

Claims

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Application Information

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IPC IPC(8): B29B15/14B29B13/08
Inventor 朱波王成国曹伟伟王永伟刘玉兰赵圣尧
Owner SHANDONG ZHONGHENG CARBON FIBER TECH DEV CO LTD