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Prepreg and method for producing same

A technology of prepreg and epoxy resin, applied in the direction of chemical instruments and methods, thin material processing, synthetic resin layered products, etc., can solve the problems of CFRP impact resistance and conductivity, CFRP breakdown, and CFRP conductivity reduction and other problems, to achieve excellent electrical conductivity and impact resistance, and to improve electrical conductivity

Active Publication Date: 2015-12-16
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its conductivity is not yet sufficient to protect CFRP from lightning damage
This is because the discharge caused by the lightning strike will enter the resin layer of CFRP, and the resin in it will evaporate, which will cause the whole interlayer peeling, which may break down the CFRP
[0008] In addition, since the resin layer of CFRP acts as an electrical insulator, the conductivity of CFRP in the thickness direction (that is, the direction at right angles to the fiber direction) deteriorates.
In particular, as described in Patent Documents 1 to 4, for such a prepreg in which thermoplastic resin fine particles are partially present in the resin layer for the purpose of improving impact resistance, due to the contact between the reinforcing fiber layers of the obtained CFRP Inhibited by thermoplastic resin particles, thus further reducing the conductivity of CFRP in the thickness direction
Therefore, it is difficult to make CFRP have both excellent impact resistance and electrical conductivity
[0009] As a method of improving the conductivity between reinforcing fiber layers, a method of adding metal particles to the matrix resin of CFRP (for example, Patent Document 5) or a method of adding carbon particles (for example, Patent Document 6) can be considered. The impact resistance of CFRP obtained by these methods is insufficient

Method used

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  • Prepreg and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、2

[0322] According to the ratio described in Table 1, the thermoplastic resin was dissolved in the epoxy resin at 120° C. using a stirrer. Then, the temperature was lowered to 80° C., the conductive particles were added and mixed for 30 minutes, and the epoxy resin composition [A] was prepared.

[0323] 10 parts by mass of Ultem 1000-1000 were dissolved in the epoxy resin at 120° C. using a stirrer at the ratio described in Table 1. Then, the temperature was lowered to 80° C., the remaining thermoplastic resin and curing agent were added, and mixed for 30 minutes to prepare an epoxy resin composition [B].

[0324] Epoxy resin composition [A] and epoxy resin composition [B] are coated on release film respectively using film coating machine, obtain resin [A] sheet and resin [A] of mass per unit area shown in Table 1 B] sheet.

[0325] Next, between the two resin [B] sheets, the above-mentioned carbon fiber bundles are supplied so as to be uniformly arranged in the same direction...

Embodiment 3～5

[0333] A prepreg was produced in the same manner as in Example 1 except that the thermoplastic resins used in the epoxy resin composition [A] and epoxy resin composition [B] were changed as described in Table 1. Various properties of the obtained prepregs are shown in Table 1.

[0334]In Examples 3 to 5 in which the type of thermoplastic resin was changed, as in Examples 1 and 2, since the thermoplastic resin was present, compared with Comparative Examples 1 and 2, the primary prepreg which was the inner layer of the prepreg was impregnated. The minimum viscosity of the resin composition in the feed is relatively high. Thus, it is difficult for the conductive particles to deposit on the inner layer of the prepreg. Therefore, for FRP produced by lamination and curing of prepregs, many conductive particles are left in the resin layer, and these particles act as conductive bridges between the reinforcing fiber layers. Therefore, the obtained FRP has a low volume resistivity in ...

Embodiment 6～11

[0337] In the ratio described in Table 2, 10 parts by mass of the epoxy resin-soluble thermoplastic resin (Ultem 1000-1000) was dissolved in the epoxy resin at 120° C. using a stirrer. Then, the temperature was lowered to 80° C., a curing agent, the remaining epoxy resin-soluble thermoplastic resin, and epoxy resin-insoluble thermoplastic resin (TR-55) were added and mixed for 30 minutes to prepare an epoxy resin composition [B]. About epoxy resin composition [A], it prepared similarly to Example 1 except having changed the addition amount of electroconductive particle. A prepreg was manufactured in the same manner as in Example 1, and the properties of the obtained prepreg are shown in Table 2.

[0338] After the prepregs obtained in Examples 6 to 11 were stored at a temperature of 26.7°C and a humidity of 65% for 10 days, their drape properties remained unchanged from those immediately after production, and their adhesiveness remained above 50%, showing excellent storage sta...

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Abstract

The invention provides a prepreg comprising: a primary prepreg composed of reinforcing fibers and a resin composition (I) impregnating the interior of a reinforcing fiber layer formed from these fibers; and a surface layer composed of a resin composition (II) formed on one or both sides of the primary prepreg; wherein the resin composition (I) is an epoxy resin composition [B} containing at least an epoxy resin and a thermoplastic resin, and the resin composition (II) is an epoxy resin composition [A] containing at least an epoxy resin and conductive particles.

Description

technical field [0001] The present invention relates to a prepreg capable of producing a fiber-reinforced composite material excellent in impact resistance and electrical conductivity, and a method for producing the same. Background technique [0002] Carbon fiber reinforced composite materials (hereinafter abbreviated as "CFRP") composed of carbon fibers and resins are widely used in aircraft, sports, leisure and general industries due to their light weight, high strength, and high modulus of elasticity. Most of this CFRP is manufactured using a prepreg that integrates carbon fiber and resin in advance. [0003] As the resin constituting the prepreg, a thermosetting resin or a thermoplastic resin is used. In particular, thermosetting resins have a high degree of freedom in molding due to their good adhesiveness and drapability, so prepregs made of thermosetting resins are widely used. Since thermosetting resins generally have low toughness, when thermosetting resins are u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/24B32B5/28B32B27/38
CPCB32B27/38C08J2363/00B32B2262/106B32B5/26B32B7/06B32B2260/023B32B2260/046B32B2264/105B32B2264/108B32B2307/202B32B2307/558B32B2307/702B32B2307/748B32B2605/00Y10T156/10Y10T428/31515C08J2377/00C08J2381/06C08J5/243C08J5/249B29C70/504B29B11/16B29K2063/00B29K2105/089B29K2307/04B29K2995/0005B32B27/08B32B37/10B32B2250/24
Inventor 铃木贵也坂元肇石渡丰明梅元祯孝
Owner TEIJIN LTD
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