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Carbon fiber strand

a carbon fiber and strand technology, applied in the direction of yarn, transportation and packaging, coating, etc., can solve the problems of insufficient adhesion between sizing agent and carbon fiber, difficult later handling, and insufficient strength of the composite material in the fiber axis direction, and achieve the effect of superior interlaminar shear strength

Inactive Publication Date: 2005-12-08
TOHO TAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] The present invention has been completed based on the above findings and aims at providing a carbon fiber strand capable of giving a carbon fiber-reinforced resin composite material superior in interlaminar shear strength greatly connected with its breaking strength in its normal-to-fiber-axis direction.
[0019] The carbon fiber strand of the present invention is constituted by impregnating a carbon fiber strand with a sizing composition which, when cured under particular conditions, shows an αtan δβtan δ of 0.07 to 0.2; therefore, by using this carbon fiber strand as a reinforcing material, there can be produced a carbon fiber-reinforced composite material superior in interlaminar shear strength.

Problems solved by technology

In this processing, the carbon fiber strand is fretted by a guide, etc., which tends to cause fluffing and accordingly makes difficult later handling.
In these proposals, however, since no consideration was made as to the adhesivity between sizing agent and carbon fiber, the adhesivity between sizing agent and carbon fiber is insufficient.
Therefore, the strength of the composite material in the fiber axis direction is not large as expected and its interlaminar shear strength is low currently.

Method used

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Examples

Experimental program
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examples

[0058] Physical properties were measured according to the following methods.

[0059] 100 parts by mass of a sizing agent and 30 parts by mass of a curing agent (Kayahard MCD, a product of Hitachi Chemical Company, Ltd.) were mixed to prepare a composition for estimation; the composition was molded and cured at 130° C. for 2 hours in a mold to obtain a cured material for estimation. This cured material for estimation was cut into a size of 30 mm (length)×6 mm (width)×3 mm (thickness) to obtain a test piece for measurement of dynamic viscoelasticity.

[0060] The test piece was measured for dynamic viscoelasticity using a dynamic mechanical analyzer (Model Rhogel E-4000, a product of UBM). The measurement conditions were temperature elevation rate: 4° C. / min, frequency: 10 Hz; and measurement temperature range: −100 to 200° C.

[0061] From the dynamic viscoelasticity curve obtained (an example of the curve is shown in FIG. 1), a tan δ of a relaxation peak (αtan δ) and a tan δ of β relaxat...

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Abstract

A sizing agent for carbon fiber consisting of a reaction products containing an unsaturated urethane compound as the principal component obtained by reacting an unsaturated alcohol with an isocyanate compound is disclosed in claim 1.

Description

TECHNICAL FIELD [0001] The present invention relates to a carbon fiber strand suitably used in applications such as resin reinforcing agent and the like. More particularly, the present invention relates to a carbon fiber strand which, when used for production of a composite material (e.g. a carbon fiber-reinforced resin), can give a composite material having sufficient adhesion between the carbon fiber and the matrix resin and being superior in interlaminar shear strength (ILSS) between the matrix resin and the carbon fiber. BACKGROUND ART [0002] Carbon fiber has features of being strong, high in elastic modulus and light as compared with other fibers; therefore, it is in wide use as a reinforcing material for a composite material using a thermoplastic resin or a thermosetting resin as the matrix resin. A composite material reinforced with carbon fiber is light and highly strong and, therefore, is in wide use in various industries including aerospace industry. [0003] The process for...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B29B15/12D06M15/55
CPCB29K2063/00D06M15/55D06M2101/40D06M2200/40D06M2200/50Y10T428/2913
Inventor SAKAJIRI, KOUICHISAEKI, TAKAOMUTO, SHINICHINISHIMURA, ISAOMATSUKI, TOSHITSUGU
Owner TOHO TAYON CO LTD
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