Prepreg and fiber-reinforced composite material

A technology of prepreg and reinforced fiber, applied in the field of prepreg and fiber reinforced composite material, can solve problems such as damage to appearance, and achieve the effects of low colorability, excellent appearance and high heat resistance

Active Publication Date: 2020-07-03
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when dicyandiamide is used as a curing agent, there is a problem that white precipitates are formed on the surface of the molded product and the appearance is impaired.

Method used

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  • Prepreg and fiber-reinforced composite material
  • Prepreg and fiber-reinforced composite material
  • Prepreg and fiber-reinforced composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129] As the epoxy resin of component [A], 80 parts by mass of "jER (registered trademark)" 154, 20 parts by mass of "Eporto (registered trademark)" YDF2001 were used, and as [B1] aromatic urea, 4 parts by mass of "Omicure (registered trademark)" 24 prepared an epoxy resin composition according to the above .

[0130] In all 100 parts by mass of epoxy in this epoxy resin composition, [A1] component was 66 mass parts, and [A1'] component was 54 mass parts. The water absorption rate of the epoxy resin composition when it stored at 85 degreeC and 95%RH for 2 hours was 1.7%.

[0131] From the obtained epoxy resin composition, a cured epoxy resin was produced according to the above . Regarding this epoxy resin cured product, Tg, flexural elastic modulus, and yellowness when Tg and 5 mass % of water were mixed and cured were measured. Tg was 129° C., Tg when cured by mixing water was 126° C., flexural modulus was 3.5 GPa, yellowness was 64, and the physical properties of the cure...

Embodiment 2～10

[0133] Except having changed the resin composition as shown in Table 1, respectively, the epoxy resin composition, epoxy resin hardened|cured material, and fabric CFRP were produced by the same method as Example 1. The mass parts of the [A1] component, the mass parts of the [A1'] component, and the water absorption rate when stored at 85° C. and 95% RH for 2 hours in 100 parts by mass of all epoxy in each example are shown in in FIG. 1.

[0134] Regarding each example, as described in Table 1, the Tg of the epoxy resin cured product, the Tg when it was cured by mixing water, the modulus of elasticity, the yellowness, and the appearance of the fabric CFRP were all good.

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Abstract

This prepreg comprises reinforcing fibers and an epoxy resin composition containing [A] an epoxy resin and [B] an aromatic urea as a curing agent, and the epoxy resin composition satisfies conditions(a) to (e): (a) as the epoxy resin [A], a phenol novolac type epoxy resin is contained at a quantity of 50-100 parts by mass relative to a total epoxy resin content of 100 parts by mass, and components of the epoxy resin in which the number n of repeating units is such that n >= 2 are contained at a quantity of 50-80 parts by mass relative to a total epoxy resin content of 100 parts by mass; (b) the average epoxy equivalent weight of the overall epoxy resin is 165-265 g / eq; (c) the water absorption rate is 3.0 mass% or less of the epoxy resin composition in cases where the composition is stored for 2 hours in an atmosphere having a temperature of 85 DEG C and a relative humidity of 95%; (d) the epoxy resin composition contains substantially only an aromatic urea as the curing agent [B]; and (e) the epoxy resin composition contains substantially no dicyandiamide.

Description

technical field [0001] The present invention relates to prepregs and fiber reinforced composites suitable for sports use and general industrial use. Background technique [0002] Epoxy resins are widely used in various industrial fields such as coatings, adhesives, electrical and electronic information materials, and cutting-edge composite materials due to their excellent mechanical properties. In particular, epoxy resins are often used in fiber-reinforced composite materials made of reinforcing fibers such as carbon fibers, glass fibers, and aramid fibers and matrix resins. [0003] In the manufacture of carbon fiber-reinforced composite materials, a prepreg obtained by impregnating a carbon fiber base material with an epoxy resin in advance is often used. After the prepreg is laminated or preformed, the epoxy resin is cured by heating to obtain a molded product. If the curing reaction of the prepreg proceeds in the course of lamination, the workability will decrease. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/10B29C43/12C08G59/32C08G59/40C08J5/24
CPCC08L63/04C08J2363/00C08G59/4021B29C43/12C08J5/243C08G59/3218C08G59/38C08G59/686C08J5/042C08G59/32
Inventor 佐野健太郎黑田泰树内田裕之釜江俊也
Owner TORAY IND INC
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