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Epoxy resin composition for fiber-reinforced composite materials, prepreg, and fiber-reinforced composite material

A technology of epoxy resin and composite materials, which is applied in the field of epoxy resin composition, can solve the problems of characteristic change, shape change, temperature unevenness, etc., and achieve excellent interlayer toughness and heat and humidity resistance, less characteristic change, and shape change little effect

Inactive Publication Date: 2014-07-16
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, these methods still cannot ensure heat and humidity resistance, cannot avoid intralayer migration of cracks, and exhibit high mold interlayer toughness.
Furthermore, there is sometimes a problem that when it is intended to be applied to large structural members such as main wing structures of aircraft and windmill blades, the shape changes due to uneven temperature in the furnace or differences in the thermal history of the material thickness direction, resulting in characteristics change

Method used

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  • Epoxy resin composition for fiber-reinforced composite materials, prepreg, and fiber-reinforced composite material
  • Epoxy resin composition for fiber-reinforced composite materials, prepreg, and fiber-reinforced composite material
  • Epoxy resin composition for fiber-reinforced composite materials, prepreg, and fiber-reinforced composite material

Examples

Experimental program
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Effect test

preparation example Construction

[0097] In the preparation of the epoxy resin composition of the present invention, a kneader, a planetary mixer, a three-roll mill, a twin-screw extruder, and the like can be preferably used. Add the block copolymer of [E] to the epoxy resin, and after kneading, raise the temperature of the composition to any temperature from 130 to 180°C while stirring, and then make the block copolymer of [E] Block copolymers are dissolved in epoxy resins. After dissolving [E] block copolymer in epoxy resin to obtain a transparent viscous liquid, lower the temperature to preferably below 120°C, more preferably below 100°C while stirring, and add [D] aromatic amine to cure It is preferable to knead the agent and [F] thermoplastic resin particles insoluble in the epoxy resin. The above method is less likely to cause coarse separation of the [E] block copolymer and has excellent storage stability of the resin composition.

[0098] When the epoxy resin composition of the present invention is us...

Embodiment 1

[0192] In a mixing device, 5 parts by mass of N,N-diglycidyl-4-phenoxyaniline (2-functional amine epoxy resin [A]), 60 parts by mass of ELM434 (4-functional amine epoxy resin [B]), 25 parts by mass of YDF2001 (bisphenol F type epoxy resin [C] with an epoxy equivalent of 450-4500), 10 parts by mass of EPON825 (epoxy resins other than [A]-[C] Resin) and 7 parts by mass of SM4032XM10 (block copolymer [E] with a reactive group that can react with epoxy resin) After kneading, knead the aromatic amine curing agent [D] that is 3,3'- An epoxy resin composition was prepared with 35 parts by mass of DAS and 20 parts by mass of TORAYPEARL TN, which is a thermoplastic resin particle [F] insoluble in epoxy resin. Compositions and ratios are given in Table 1 (in Table 1, numbers indicate parts by mass). For the epoxy resin composition obtained, according to the measurement of the flexural elastic modulus of the above-mentioned (2) resin cured product, (3) the toughness (K) of the resin cur...

Embodiment 2～10、 comparative example 2～12

[0196] As shown in Tables 1 and 2, the epoxy resin composition was prepared in the same manner as in Example 1, except that the types and compounding amounts of the epoxy resin, block copolymer, curing agent, and thermoplastic resin particles were changed. For the epoxy resin composition obtained, measure according to the bending modulus of elastic modulus of above-mentioned (2) cured resin and (3) the toughness (K) of cured resin IC ) measurement, (4) measurement of glass transition temperature, (5) measurement of phase separation structure size, (6) evaluation of change range of phase separation structure size, measurement of flexural modulus of cured resin, K IC , glass transition temperature, phase separation structure size, and the variation range of phase separation structure size under each molding condition. In addition, using the obtained prepreg, according to the above (8) the abundance of particles existing in the depth range of 20% of the thickness of the prepreg, ...

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Abstract

Provided are: a fiber-reinforced composite material which is suppressed in morphology variation due to the molding conditions, while having excellent mode I interlaminar fracture toughness and excellent wet heat resistance; an epoxy resin composition for obtaining the fiber-reinforced composite material; and a prepreg which is obtained using the epoxy resin composition. An epoxy resin composition for fiber-reinforced composite materials, which contains at least the following constituent elements [A]-[F], and which is characterized by containing 5-25 parts by mass of constituent element [C] and 2-15 parts by mass of constituent element [E] per 100 parts by mass of the total epoxy resin blended therein. [A] A bifunctional amine type epoxy resin [B] A tetrafunctional amine type epoxy resin [C] A bisphenol F epoxy resin having an epoxy equivalent weight of 450-4,500 [D] An aromatic amine curing agent [E] A block copolymer having a reactive group that can be reacted with an epoxy resin [F] Thermoplastic resin particles that are insoluble in an epoxy resin

Description

technical field [0001] The present invention relates to a fiber-reinforced composite material suitable for aerospace applications, a prepreg for obtaining the fiber-reinforced composite material, and an epoxy resin composition for a fiber-reinforced composite material suitable for use as a matrix resin thereof (hereinafter also referred to as referred to as "epoxy resin composition"). Background technique [0002] Carbon fiber-reinforced composite materials are useful due to their excellent specific strength and specific stiffness, and are widely used in aircraft structural members, windmill blades, automobile outer panels, IC trays, and computer applications such as casings (housings) of notebook computers. The demand is increasing year by year. [0003] Carbon fiber-reinforced composite materials are heterogeneous materials formed by molding prepregs. The prepregs have reinforcing fibers, namely carbon fibers, and matrix resin as essential components. Therefore, the physi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/40C08G59/28C08G59/58C08J5/24C08L63/00
CPCC08G59/28C08J2363/00C08G59/32C08G59/5033C08L63/00C08J5/243C08L53/00C08L101/00C08G59/58C08J5/24
Inventor 永野麻纪清水悠子富冈伸之
Owner TORAY IND INC
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