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Preparation method of dimer acid modified epoxy resin toughened carbon fiber prepreg

A carbon fiber prepreg, epoxy resin technology, applied in the field of composite materials, can solve the problems of poor carbon fiber wettability, etc., and achieve the effects of improving toughness, reducing moisture permeability, and good toughening effect.

Active Publication Date: 2015-06-24
中威北化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiency that the prepreg epoxy resin system toughened by general technology has poor wettability to carbon fiber, the purpose of the present invention is to adopt a modified epoxy resin similar in molecular structure to the carbon fiber sizing agent as a toughening component, Provide a dimer acid-modified epoxy resin toughened medium-temperature curing prepreg, obtain a good impregnation effect of the resin system on the fiber, and improve the adhesion and peel strength of the resin to the fiber

Method used

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  • Preparation method of dimer acid modified epoxy resin toughened carbon fiber prepreg
  • Preparation method of dimer acid modified epoxy resin toughened carbon fiber prepreg

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Weigh 400g of dimer acid (viscosity is 5000cps), 600g of liquid bisphenol A glycidyl ether and 1g of catalyst triphenylphosphine, put them in a reaction kettle, react at 120°C for 6h under the protection of nitrogen, and cool the product to obtain di Polyacid modified epoxy resin. Get 130g (mass fraction is 5%) above-mentioned dimer acid modified epoxy resin, add liquid bisphenol A type epoxy resin 1560g, solid bisphenol A type epoxy resin 1040g, curing agent urea derivative 208g, vigorously stir Finally, the air bubbles are removed by vacuum to obtain an epoxy resin system for prepregs. The epoxy resin system was poured into the spline mold and cured at 100°C for 2 hours to prepare the cast body spline. The above resin system is prepared with a film machine to prepare a film, and then compounded with a carbon fiber fabric through a compound machine to prepare a carbon fiber prepreg. The prepreg was cut into layers, cured on a flat vulcanizer at 100°C for 2 hours to p...

Embodiment 2

[0023] Weigh 500g of dimer acid (viscosity of 6500cps), 500g of liquid bisphenol AD ​​glycidyl ether and 3g of catalyst tetrabutylphosphorus chloride, place them in a reaction kettle, react at 140°C for 4h under the protection of nitrogen, and cool the product to prepare Obtain dimer acid modified epoxy resin. Get 260g (mass fraction is 10%) above-mentioned dimer acid modified epoxy resin, add liquid bisphenol F type epoxy resin 1380g, solid bisphenol A type epoxy resin 1220g, curing agent modified dicyandiamide 130g, strong After stirring, air bubbles are removed by vacuum to obtain an epoxy resin system for prepregs. The epoxy resin system was poured into the spline mold and cured at 120°C for 2 hours to prepare the cast body spline. The above resin system is prepared with a film machine to prepare a film, and then compounded with carbon fiber through a compound machine to prepare a unidirectional carbon fiber prepreg. The prepreg was cut into layers, cured on a flat vulca...

Embodiment 3

[0025] Weigh 600g of dimer acid (viscosity 8000cps), 400g of liquid bisphenol F glycidyl ether and 5g of catalyst benzyl triphenylphosphine bromide and place them in a reaction kettle, react at 160°C for 2h under nitrogen protection, and cool the product , to prepare dimer acid modified epoxy resin. Get 390g (mass fraction is 15%) above-mentioned dimer acid modified epoxy resin, add liquid novolac epoxy resin 1760g, solid bisphenol A type epoxy resin 840g, curing agent dicyandiamide 247g and imidazole derivative 13g, strong After stirring, air bubbles are removed by vacuum to obtain an epoxy resin system for prepregs. The epoxy resin system was poured into the spline mold and cured at 140°C for 2 hours to prepare the cast body spline. The above resin system is prepared with a film machine to prepare a film, and then compounded with carbon fiber through a compound machine to prepare a unidirectional carbon fiber prepreg. The prepreg was cut and laid up, cured on a flat vulcan...

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Abstract

The invention provides a preparation method of a dimer acid modified epoxy resin toughened carbon fiber prepreg, which comprises the following steps: by taking a component of which the molecular structure is similar to that of a carbon fiber sizing agent as toughener, preparing a dimer acid modified epoxy resin through a pre-reaction method; adding reactants into the mixed epoxy resin, adding a latent curing agent, and evenly mixing to obtain a resin system for the prepreg; and coating the resin system through a film coating machine, and then compounding with carbon fibers or a fabric made therefrom to prepare the moderate-temperature curing prepreg having fine operability and adhesivity. Compared with the traditional rubber toughened prepreg, the invention can enhance the wettability of the resin system on carbon fibers, reduce the moisture permeability of the prepreg and simultaneously improve the toughness and impact resistance of the composite material, thus being suitable for manufacturing of a prepreg for winding formation.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to a preparation method of dimer acid modified epoxy resin toughened carbon fiber prepreg. Background technique [0002] At present, most of the carbon fibers in the world are applied in the form of prepregs. With the vigorous expansion of domestic carbon fibers, it is imperative to develop the downstream application market of prepregs. The mechanical properties of domestic carbon fiber monofilaments have reached or exceeded similar foreign products, but due to the large difference between the domestic carbon fiber surface sizing agent and foreign similar products, the surface wettability of domestic carbon fiber is poor, so the resin in the prepreg production process The wettability puts forward higher requirements. [0003] Commercial carbon fiber prepregs are mostly based on epoxy resin systems cured at medium temperatures. In order to improve the impact resistance of the comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/02C08L63/04C08L63/00C08G59/14C08K7/00C08K7/06
Inventor 李刚刘毅斌杨小平苏清福
Owner 中威北化科技有限公司
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