Lg Chem, Ltd

Jeong Hun Cho

Joon Hee Cho

Chang Hun Kim

Hyun Min Kim

Young Soo Song

Hyo Yong Kim

Ye Hoon Im

Sung Joon Oh

Sang Jin Kim

Jeong Kyu Lee

In Young Song

Yeon Soo Kim

Wan Kyu Oh

Jeongkyu Lee

Ki Yeon Jo

Jung Kee Jang

Chang Hong Bak

Jong Soo Do

Hye Jin Han

Jong Gil Kim

Yujin An

Yeonji Choe

Minchang Sung

Provided is a method of preparing an acrylonitrile-based copolymer for a carbon fiber, which comprises: preparing a reaction solution including a monomer mixture comprising a sulfonate-based monomer represented by Chemical Formula 1, a carboxylic acid-based monomer, and an acrylonitrile-based monomer and an organic solvent; and subjecting the reaction solution to polymerization, wherein the monomer mixture comprises the sulfonate-based monomer represented by Chemical Formula 1 at 0.55 to 1.6 mol %.

Method of preparing acrylonitrile-based copolymer for carbon fiber

The present invention relates to a dispersion device and a defoamation device comprising the same, which provides a dispersion device comprising a dispersion plate equipped with an inclined surface extended downwards obliquely and raw material inflow nozzles formed on the inclined surface to introduce a raw material into the inclined surface; and a band spaced apart from the inclined surface of the dispersion plate to form a gap from the inclined surface, thereby being configured so that the raw material flows through the gap.

Dispersing apparatus and defoaming apparatus comprising same

The present invention relates to a method for producing a polyacrylonitrile-based fiber, wherein the method polymerizes a monomer mixture including an acrylonitrile-based monomer, a carboxylic acid-based comonomer, and an acrylate-based comonomer, wherein the acrylate-based comonomer includes the steps of producing a polyacrylonitrile-based copolymer so as to be included in an amount of 4 to 20 parts by weight based on 100 parts by weight of the monomer mixture, fiberizing the polyacrylonitrile-based copolymer, oxidizing and stabilizing the fiberized polyacrylonitrile-based copolymer, which may control the oxidation stabilization reaction, particularly the cyclization reaction. Accordingly, the energy consumption of the oxidation stabilization reaction may be reduced, economical efficiency of the production of polyacrylonitrile-based fiber may be obtained, and the physical and mechanical properties of the carbon fiber may be improved.

Method for producing polyacrylonitrile-based fiber and polyacrylonitrile-based copolymer used therein

A method of preparing an acrylonitrile-based copolymer for a carbon fiber. The method includes: preparing a reaction solution including a (meth)acrylonitrile-based monomer and a first reaction solvent; adding a first portion of a radical polymerization initiator to the reaction solution to initiate polymerization; and adding a second portion of the radical polymerization initiator to the reaction solution when a polymerization conversion ratio is between 70 to 80%.

Method of preparing acrylonitrile-based polymer for producing carbon fiber

The present invention relates to a method for producing an acrylonitrile-based fiber, the method including: providing a polymer solution including an acrylonitrile-based copolymer containing a carboxylic acid group; mixing 100 parts by weight of the polymer solution with 1 to 6 parts by weight of a hydrophilization solution containing an organic solvent and ammonia water in a weight ratio of 95:5 to 60:40 to prepare a spinning stock solution; and spinning the spinning stock solution. The method controls the viscosity of the spinning stock solution to improve the stretchability and strength of the acrylonitrile-based fiber, and suppresses the occurrence of gelation.

Method for producing acrylonitrile-based fiber

The present invention relates to a method of preparing a (meth)acrylonitrile-based polymer for preparing a carbon fiber, which comprises adding a reaction solution comprising a (meth)acrylonitrile-based monomer and a reaction solvent to a reactor to perform solution polymerization, performing solution polymerization under a condition in which a power consumption of the reactor is 1 to 5 kW/mwhen the reaction solution in the reactor has a viscosity of 0.1 poise or more and 250 poise or less, and performing solution polymerization under a condition in which a power consumption of the reactor is 8 to 13 kW/mwhen the reaction solution in the reactor has a viscosity of more than 250 poise and 450 poise or less.

Method of preparing (meth)acrylonitrile-based polymer for preparing carbon fiber

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Daejeon, South Korea

Jeong Hun Cho