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Prepreg and preparation method thereof

A prepreg, hot-melt technology, applied in the field of composite materials, can solve the problems of poor material system uniformity and stability, low efficiency of manual brushing and setting agent, difficult control of impregnation uniformity, etc. Improve laying efficiency and controllable distribution uniformity

Inactive Publication Date: 2020-04-14
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional RTM process directly uses dry fibers or fabrics, and there are technical problems such as fiber prefabricated body laying and qualitative difficulties. Especially for RTM molding of large-sized parts, the traditional process has low efficiency of manual brushing and setting agent, and the material system Uniformity and poor stability, etc., so the present invention proposes a low resin content prepreg suitable for automatic laying of RTM preforms, which can apply many performance advantages of prepregs to the RTM molding process to solve above question
The existing technical problems are: 1) The resin content of the prepreg suitable for RTM molding needs to be controlled at a low level, and it is difficult to control the uniformity of impregnation; 2) The low resin content prepreg must meet the requirements of the slitting process to obtain It is suitable for the prepreg tow of the preform automatic laying system. However, due to the low resin content of the prepreg, the tow is prone to splitting during the cutting process

Method used

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  • Prepreg and preparation method thereof
  • Prepreg and preparation method thereof
  • Prepreg and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Composition structure:

[0040] T700 continuous carbon fiber 88~90wt%

[0041] 5g / m 2 Short fiber carbon felt (about 0.1mm thick) 2~2.5wt%

[0042] Medium temperature curing epoxy resin 8~10wt%

[0043] Preparation Process:

[0044] 1. Prepare the resin film, select the appropriate temperature and pressure between the rollers, and control the surface density of the resin film at 10±1g / m 2 .

[0045] 2. Add 5g / m 2 The short-fiber carbon felt is prepreg compounded with the resin film prepared in step 1.

[0046] 3. Impregnation and compounding to obtain a prepreg.

[0047] 197g / m 2 One side of the T700 unidirectional continuous carbon fiber is covered with a pure resin film, and the other side is covered with the resin-impregnated short-fiber carbon felt prepared in step 2. The composite temperature is 85°C, and the resin viscosity is about 10000mPa·s.

[0048] 4. Slitting. Use a slitting device to cut the prepreg cloth obtained by impregnated composite winding in...

Embodiment 2

[0051] Composition structure:

[0052] T700 continuous carbon fiber 85~88wt%

[0053] 10g / m 2 Short fiber carbon felt (about 0.2mm thick) 4~5wt%

[0054] High temperature curing epoxy resin 8~10wt%

[0055] Preparation Process:

[0056] The surface density of the adhesive film prepared from the prepreg is controlled at 10±1g / m 2 , use 10g / m 2 For short-fiber carbon felt, the temperature of impregnation and compounding is 100°C, and the resin viscosity is about 8000mPa·s. Other process conditions are the same as in Example 1. The prepreg fabric obtained by impregnation and compounding is cut into prepregs with a width of 3.175mm±0.025mm. Tow, the prepreg tow after slitting is not split, and the prepreg tow has good surface lap adhesion at the laying temperature of the RTM preform, and can be used for automatic forming and weaving of the RTM preform.

[0057] Scanning electron microscope analysis was carried out on the surface and internal structure of the obtained prepreg...

Embodiment 3

[0059] Composition structure:

[0060] T700 continuous carbon fiber 80~83wt%

[0061] 15g / m 2 Short fiber carbon felt (about 0.3mm thick) 5~7wt%

[0062] Bismaleimide resin 10~13wt%

[0063] Preparation Process:

[0064] The surface density of the adhesive film prepared from the prepreg is controlled at 13±1g / m 2 , use 15g / m 2 Short-fiber carbon felt, prepreg composite temperature 85°C, resin viscosity about 12000mPa·s Other process conditions are the same as in Example 1, the prepreg fabric obtained by impregnating composite winding is cut into pieces with a width of 12.7mm±0.025mm Prepreg tow, the prepreg tow after slitting is not split, and the prepreg tow has good surface lap adhesion at the laying temperature of the RTM preform, and can be used for automatic forming and weaving of the RTM preform.

[0065] Scanning electron microscope analysis was carried out on the surface and internal structure of the obtained prepreg, and the results were consistent with image ...

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Abstract

The invention provides a prepreg and a preparation method, the prepreg is composed of continuous reinforced fibers, a thin-layer mesh felt and resin, the prepreg is formed by compounding the continuous reinforced fibers and the thin-layer mesh felt by dipping in a double-sided resin film by a hot melting method, and the thin-layer mesh felt is located at one side of the continuous reinforced fibers, wherein the resin accounts for not more than 15% of the mass of the prepreg, the continuous reinforced fibers account for not less than 80% of the mass of the prepreg, and the balance is the thin-layer mesh felt. Through prepreg structure design and preparation process control, the prepreg meets the requirements of a subsequent slitting process and an RTM forming process, and is convenient to store and transport.

Description

technical field [0001] The invention relates to a prepreg and a preparation method, belonging to the technical field of composite materials. Background technique [0002] Fiber-reinforced resin-based composites have been widely used in aerospace structures due to their excellent properties such as light weight, high strength and high toughness. In recent years, the development of various low-cost molding technologies has promoted the expansion of the application range of fiber-reinforced resin-based composite materials, and the application scenarios have become more abundant. The resin transfer molding (RTM) process is the earliest liquid molding technology developed for the low cost of advanced composite materials. In the RTM molding process, the dry fibers are firstly fixed with a sizing agent, or the fabric preform is directly placed in a closed mold, and then injected into the resin matrix. After curing and molding, a near-net size composite material component with exce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/24C08L63/00C08L79/08C08K7/06
CPCC08J5/24C08J2363/00C08J2379/08C08K7/06
Inventor 陈哲明欧秋仁董大为张帅陈超
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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