KR850700046A - High strength high elastic carbon fiber and its manufacturing method - Google Patents

Abstract

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Description

High strength high elastic carbon fiber and its manufacturing method

As this is a public information case, the full text was not included.

The accompanying drawings show the relationship between the temperature and strand strength, strand elastic modulus and density of carbon fiber by conventional methods.

Claims (8)

And the fiber diameter of 1-6μ, the strand strength 430Kg / mm ² or more, a strand elastic modulus 28ton / mm ² or more, high intensity density is greater than or equal to 1,755g / cm ^3, high modulus carbon fiber. Acrylonitrile fiber precursor ), The fiber density 1.22g / cm by an oxidizing atmosphere at a temperature of 200-400 ℃ fiber while a density of 3% or more in height (伸張) until the 1.22g / cm ³ hanhu my chloride reprocessed within chloride treatment After the heat treatment under the condition of exceeding ³ and in the range of 1.40 g / cm ³ or less, and subsequently increasing the elongation of the chloride fiber to 3% or more at a temperature of 300-800 ° C. in an inert atmosphere, and then again 1300 in an inert atmosphere. At the temperature of -1650 ℃, yarn The fiber diameter, characterized in that, while the heat treatment tension 1-6 μ, soup land strength 430kg / mm ² or more, a strand elastic modulus 28ton / mm ² or more, a density 1,755g / cm ³ or more high-strength, high modulus carbon fiber production method. A method for producing the carbon fiber according to claim 2, wherein a single fiber fineness of 0.1-1.1 denier is used as the acrylonitrile fiber. The manufacturing method of the carbon fiber of Claim 3 which uses the acrylonitrile fiber bundle whose fineness fluctuation rate is 15% or less. The carbon fiber manufacturing method according to claim 3 or 4, wherein acrylonitrile-based polymer fibers do not adhere or contain impurities having a particle size of 10 μm or more. The heat treatment process of 300-800 ℃ is divided into two processes, 300-500 ℃ and 500-800 ℃ under the inert atmosphere of flame resistant yarn, and the elongation rate of the yarn is more than 3% in the heat treatment process of 300-500 ℃, and 500-800 In the heat treatment step of ℃, the method of producing a carbon fiber according to claim 2, characterized in that the heat treatment while being so as not to shrink substantially the yarn state. The carbon fiber manufacturing method according to claim 6, wherein the fiber has an elongation of 1% or more in a heat treatment at 500-800 ° C. under an inert atmosphere of flame resistant fiber. The flame resistant yarn having a fiber density of 1.22 g / cm3 is a flame resistant yarn having a fiber density exceeding 1.22 g / cm ³ and having a fiber density in the range of 1.400 g / cm ³ or less, so that 1% or more of elongation is given to the yarn. The manufacturing method of the carbon fiber of Claim 2 to be used. ※ Note: The disclosure is based on the initial application.