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Epoxy resin composition for fiber reinforced composite material and prepreg using same

A technology of epoxy resin and composition, applied in the field of epoxy resin composition, which can solve the problems of low solubility of epoxy resin, decreased heat resistance of cured products, difficulty in stacking prepregs, etc., and achieve excellent storage stability Effect

Active Publication Date: 2021-09-03
TORAY ADVANCED MATERIALS KOREA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, if a high-viscosity epoxy resin is used or a filler is used, the viscosity at normal temperature becomes high, making it difficult to prepare a prepreg, and the tacky surface of the prepreg decreases, making it difficult to stack the prepreg
If a thermoplastic polymer is added, the solubility to epoxy resin is low, and it is difficult to increase its content to a level where the fluidity of the resin decreases, so there is a problem that the heat resistance (glass transition temperature) of the cured product decreases
In addition, when the fluidity of the resin is too low, the possibility of defects such as remaining voids in the fiber-reinforced composite material increases

Method used

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  • Epoxy resin composition for fiber reinforced composite material and prepreg using same
  • Epoxy resin composition for fiber reinforced composite material and prepreg using same
  • Epoxy resin composition for fiber reinforced composite material and prepreg using same

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preparation example Construction

[0045]In particular, in order to mass-produce fiber-reinforced composite materials, the present invention provides an epoxy resin composition and a method for preparing a prepreg using it, wherein the degree of curing is 90% or more or 91% when compression-molded with a mold at 150°C for 3 minutes. % or more, preferably more than 93% or more than 95%, the glass transition temperature (T g ) is 140°C or higher or 141°C or higher, preferably 143°C or higher or 147°C or higher, the fluidity of the resin is controlled, and the molded product has no internal or external defects and is of good quality.

[0046] According to one embodiment of the present invention, there is provided an epoxy resin composition comprising the following components (A), (B), (C) and (D).

[0047] (A) a mixture of bisphenol A type epoxy resin with bifunctionality and glycidylamine type epoxy resin with four functional groups;

[0048] (B) dicyandiamide as epoxy resin curing agent;

[0049] (C) a mixture...

Embodiment 1～4

[0101] Epoxy resin compositions were prepared according to the proportions shown in Table 1 below.

[0102] First, weigh the epoxy resin of component (A) and the thermoplastic resin of component (D) into a glass flask, and stir at 150°C for more than 2 hours to prepare a base resin in which the thermoplastic resin of component (D) is completely dissolved. On the other hand, after weighing the liquid bisphenol A type epoxy resin in the (A) component, that is, EPON 828 12phr and (B), (C) components are mixed, and the mixture is uniformly dispersed by a three-roll machine (3Roll Mill) to Prepare the curing agent slurry. The base resin and curing agent slurry were mixed at a temperature of about 80° C. to prepare an epoxy resin composition.

[0103] It is 107g / m that the weight per square meter of resin is coated with the epoxy resin composition that utilizes comma coater to prepare in this way 2 , so as to prepare a uniform resin film.

[0104] Then, the unidirectional carbon ...

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Abstract

The present invention relates to a kind of epoxy resin composition suitable for batch production of fiber reinforced composite material and the prepreg material utilizing it, the epoxy resin composition comprises following component (A), component (B), component (C) and component ( D): (A) mixture of bifunctionality BPA type epoxy resin and tetrafunctionality glycidylamine type epoxy resin; (B) dicyandiamide as epoxy curing agent; (C) as curing accelerator A mixture of aliphatic tertiary amine adduct type latent curing agent and imidazole; (D) carboxyl-containing polyvinyl acetal resin as a thermoplastic polymer. According to the present invention, it is possible to provide a prepreg which is excellent in storage stability at room temperature, can be thermally cured within a few minutes to be suitable for mass production, and can control resin fluidity during compression molding without causing internal and external defects of the molded product.

Description

[0001] This application claims priority to Korean Patent Application No. 10-2016-0079556 filed on June 24, 2016 and Korean Patent Application No. 10-2017-0079636 filed on June 23, 2017, the entire contents of which are hereby incorporated by reference into this application. technical field [0002] The invention relates to an epoxy resin composition suitable for mass production of fiber-reinforced composite materials and a prepreg using it. Background technique [0003] Fiber-reinforced composite materials have high specific strength and specific elastic modulus, so they are widely used in the fields of leisure sports, aviation, automobiles and railways, electronic products and general industrial fields. [0004] In particular, recently, in the automotive field, there has been an increasing demand for weight reduction due to the regulation of carbon dioxide emissions and improvement of fuel efficiency, and fiber-reinforced composite materials have attracted attention as a ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/32C08G59/50C08K5/3445C08L63/06C08L29/14C08J5/24
CPCC08G59/3227C08G59/504C08K5/3445C08L63/06C08L29/14C08J5/243C08J5/249
Inventor 李宰源郑勋熙金炫锡
Owner TORAY ADVANCED MATERIALS KOREA
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