Preparation method of carbon fiber/toughened epoxy resin prepreg for vacuum bag forming process

A tough epoxy resin, epoxy resin technology, applied in the field of carbon fiber/toughened epoxy resin prepreg preparation, can solve the requirements of resin raw materials and resin preparation process, affect resin fluidity and room temperature storage, hinder Resin flow fiber impregnation and other issues, to achieve the effect of precise control of resin content and fiber surface density, easy promotion, and strong controllability of the process

Active Publication Date: 2020-05-22
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the toughening agent is dissolved in the epoxy resin for toughening, the viscosity of the resin is too high, which will hinder the flow of the resin and the impregnation of the fiber at high temperature, so that the porosity of the cured part will be high, which will affect the part. molding quality
In addition, the epoxy resin system with thermoplastic resin has a high viscosity, and it is often necessary to mix and configure the components at a relatively high temperature, which will cause a more obvious curing reaction between the curing agent and the epoxy resin, affecting the fluidity and stability of the resin. Storage at room temperature, also affects the preparation of semi-impregnated prepregs
Patent CN105109068 discloses a method of adjusting the viscosity of the resin system to meet the requirements for the preparation of OoA prepregs, but does not put forward requirements for the resin raw materials and the preparation process of the resin

Method used

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  • Preparation method of carbon fiber/toughened epoxy resin prepreg for vacuum bag forming process
  • Preparation method of carbon fiber/toughened epoxy resin prepreg for vacuum bag forming process
  • Preparation method of carbon fiber/toughened epoxy resin prepreg for vacuum bag forming process

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preparation example Construction

[0041] As mentioned above, the epoxy resin system can be prepared by the preparation method of the resin matrix well known to those skilled in the art, preferably by mixing and preparing with a planetary mixer, and the preparation steps are as follows:

[0042] Step 1: Take 60-100 parts of epoxy resin and its composition by mass ratio, 5-25 parts of toughening agent, and 30-55 parts of amine epoxy resin curing agent; The toughness, fluidity and curing characteristics of the resin shall meet the requirements.

[0043] Step 2: According to the order of epoxy resin and its composition, toughening agent and curing agent, add the raw materials weighed in step 1 into the barrel and stir at a certain temperature for a period of time. The preferred stirring temperature in this step is 70-120° C., and the preferred stirring time is 10-40 min. The specific stirring temperature and stirring time shall be subject to the incomplete dissolution of the thermoplastic resin particles and curi...

Embodiment 1

[0052] Use T700SC carbon fiber tow to prepare fiber surface density of 150g / m 2 OoA prepregs. According to 80 parts by mass of AG80 resin, 20 parts by mass of E44 resin, 25 parts by mass of polyethersulfone (PES, D90 is 50 μm), 47 parts by mass of 4,4'-DDS (D90 is 30 μm), 0.5 parts by mass of The ratio of boron trifluoride monoethylamine is used to prepare epoxy resin.

[0053] Resin mixing steps: Add AG80 resin and E44 resin to the cylinder of planetary mixer, mix for about 10 minutes at 100°C; add PES, mix for about 30 minutes at 100°C; add 4,4'-DDS, mix for about 30 minutes at 100°C; add trifluoro Boron monoethylamine, mixed at 100°C for about 5 minutes.

[0054] Prepreg preparation steps: the resin mixture obtained in the above steps is coated on the release paper at 70°C, and the thickness of the resin film is controlled so that the surface density of the resin film is 40g / m 2 . The carbon fiber tow is compounded with the resin film on both sides at 65 °C and the pres...

Embodiment 2

[0056] Use T800H carbon fiber tow to prepare fiber surface density of 125g / m 2 OoA prepregs. According to 80 parts by mass of AFG90 resin, 10 parts by mass of E51 resin, 15 parts by mass of polyether ketone (PEK, D90 is 60 μm), 53 parts by mass of 4,4'-DDS (D90 is 25 μm), 0.5 parts by mass of The ratio of boron trifluoride monoethylamine is used to prepare epoxy resin.

[0057] Resin mixing steps: Add AFG90 resin and E51 resin to the cylinder of planetary mixer, mix for about 10 minutes at 90°C; add PEK, mix for about 30 minutes at 90°C; add 4,4'-DDS, mix for about 30 minutes at 90°C; add trifluoro Boron monoethylamine, mixed at 90°C for about 5 minutes.

[0058] Prepreg preparation steps: the resin mixture obtained in the above steps is coated on the release paper at 60°C, and the thickness of the resin film is controlled so that the surface density of the resin film is 34g / m 2 . The carbon fiber tow and the resin film on both sides are compounded under the conditions of ...

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Abstract

The invention discloses a preparation method of a carbon fiber/toughened epoxy resin prepreg for a non-autoclave vacuum bag forming process. According to the method, the dissolution degree and the particle size of a curing agent and a toughening agent in epoxy resin are controlled by controlling a resin formula, the particle sizes of the curing agent and the toughening agent and process conditionsfor resin system configuration, and meanwhile, two modification effects are achieved: 1, the resin system is toughened; and 2, the requirements of a non-autoclave process on the viscosity of the resin in the prepreg and a room-temperature storage period are met. The prepared epoxy resin system is prepared into a rubber film, the carbon fiber/epoxy resin prepreg is further prepared by adopting a rubber film calendering method, and the semi-impregnated prepreg (unsaturated impregnated prepreg) is obtained by controlling the pressure and temperature during compounding of the rubber film and carbon fibers.

Description

technical field [0001] The present invention is a preparation method of carbon fiber / toughened epoxy resin prepreg, more specifically, refers to the preparation method of carbon fiber / toughened epoxy resin prepreg suitable for non-autoclave vacuum bag forming process , including the preparation of toughened epoxy resins and the preparation of unsaturated impregnated prepregs. Background technique [0002] Carbon fiber reinforced epoxy resin-based composites are widely used in aerospace and civil fields due to their light weight, high strength, good molding and curing process, and excellent comprehensive performance. They are one of the most common types of advanced composite materials. In the field of aerospace, carbon fiber / epoxy resin prepreg is often used as the intermediate material, and the autoclave process is used as the molding and curing method to prepare high-quality composite products. [0003] Compared with the traditional autoclave forming process, the out-of-a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/24C08L63/02C08L63/00C08L81/06C08L71/10C08K7/06
CPCC08J5/24C08J2363/00C08J2363/02C08J2463/02C08J2471/10C08J2481/06C08K7/06
Inventor 顾轶卓李敏陈晓妍王绍凯张佐光
Owner BEIHANG UNIV
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