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    Dispersing Apparatus and Defoaming Apparatus Comprising Same
    4.
    发明申请
    Dispersing Apparatus and Defoaming Apparatus Comprising Same 有权

    公开(公告)号：US20210039021A1

    公开(公告)日：2021-02-11

    申请号：US16964041

    申请日：2019-08-20

    Applicant: LG Chem, Ltd.

    Inventor： Jung Kee Jang ,  Jeong Hun Cho ,  Joon Hee Cho ,  Ye Hoon Im ,  Young Soo Song

    IPC: B01D19/02 ,  D01D1/10 ,  B01F3/12

    Abstract: 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.

    Method for producing polyacrylonitrile-based fiber and polyacrylonitrile-based copolymer used therein
    5.
    发明授权
    Method for producing polyacrylonitrile-based fiber and polyacrylonitrile-based copolymer used therein 有权

    公开(公告)号：US11535957B2

    公开(公告)日：2022-12-27

    申请号：US16335076

    申请日：2017-11-22

    Applicant: LG CHEM, LTD.

    Inventor： Jeong Kyu Lee ,  Chang Hun Kim ,  In Young Song ,  Jeong Hun Cho ,  Jong Soo Do ,  Sung Joon Oh ,  Joon Hee Cho

    IPC: D01F9/22 ,  C08F220/04 ,  C08F220/18 ,  C08F220/44

    Abstract: 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 of preparing (meth)acrylonitrile-based polymer for preparing carbon fiber
    8.
    发明授权
    Method of preparing (meth)acrylonitrile-based polymer for preparing carbon fiber 有权

    公开(公告)号：US11046792B2

    公开(公告)日：2021-06-29

    申请号：US16469030

    申请日：2018-09-14

    Applicant: LG CHEM, LTD.

    Inventor： Jeong Hun Cho ,  Young Soo Song ,  Hyun Min Kim ,  Chang Hun Kim ,  Hyo Yong Kim ,  Joon Hee Cho

    IPC: C08F2/01 ,  C08F2/06 ,  C08F20/44 ,  D01F9/22

    Abstract: 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/m3 when 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/m3 when the reaction solution in the reactor has a viscosity of more than 250 poise and 450 poise or less.

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