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Method for preparing acrylonitrile-based polymer for manufacture of carbon fiber

A technology of acrylonitrile and carbon fiber, which is applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of high viscosity of polymer solution, reduced weight average molecular weight, and low efficiency, and achieves low polydispersity index and high final polymerization conversion. rate effect

Active Publication Date: 2019-07-26
LG CHEM LTD
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Problems solved by technology

[0008] However, when the initiator is added in excess to increase the polymerization conversion rate in solution polymerization, the weight average molecular weight decreases and the viscosity of the polymer solution is too high, so that the efficiency decreases when used as a spinning solution for polyacrylonitrile fibers

Method used

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  • Method for preparing acrylonitrile-based polymer for manufacture of carbon fiber

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preparation example Construction

[0019] A method for producing an acrylonitrile-based polymer for producing carbon fibers according to an exemplary embodiment of the present invention includes: (1) preparing a reaction solution comprising a (meth)acrylonitrile-based monomer and a first reaction solvent, (2 ) adding an initiator to the reaction solution for the first time to initiate polymerization, and (3) adding the initiator for a second time to perform polymerization at a time point when the polymer conversion rate reaches 70% to 80%.

[0020] Hereinafter, each step of the preparation method according to the present invention will be described in detail.

[0021] (1) Preparation of reaction solution

[0022] First, a reaction solution containing a (meth)acrylonitrile-based monomer and a first reaction solvent is prepared.

[0023] The (meth)acrylonitrile-based monomer may be one or more selected from acrylonitrile and methacrylonitrile, and is preferably acrylonitrile.

[0024] The first reaction solvent...

Embodiment 1

[0054] A reaction solution was prepared by uniformly dissolving 100 parts by weight of a monomer mixture in which acrylonitrile, methyl acrylate, and itaconic acid were mixed in a molar ratio of 97:2:1 in 365 parts by weight of dimethylsulfoxide. A radical polymerization initiator solution was prepared by uniformly dissolving 0.2 parts by weight of azobisisobutyronitrile as a radical polymerization initiator in 5 parts by weight of dimethylsulfoxide.

[0055] The reaction solution was added to a reactor equipped with a stirrer, nitrogen replacement was performed, and then the temperature in the reactor was raised to 70°C. Add 0.4 parts by weight of azobisisobutyronitrile as a radical polymerization initiator to carry out solution polymerization for 5 hours, add the radical polymerization initiator solution of the whole amount in batches (at the point in time when the polymerization conversion rate reaches 70%) to After performing the polymerization reaction for 8 hours, the re...

Embodiment 2

[0057] Acrylonitrile was obtained by the same method as described in Example 1, except that the entire amount of the radical polymerization initiator solution was added in portions after the solution polymerization was carried out for 6 hours (at the time point when the polymerization conversion ratio reached 75%) Polymer solution.

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Abstract

The present invention relates to a method for preparing an acrylonitrile-based copolymer for a carbon fiber, comprising the steps of: preparing a reaction solution comprising a (meth)acrylonitrile-based monomer and a first reaction solvent; initiating polymerization by primarily injecting an initiator into the reaction solution; and secondarily injecting an initiator and carrying out polymerization when the polymerization conversion rate reaches 70-80%.

Description

technical field [0001] [Cross Reference to Related Application] [0002] This application claims the priority and rights of Korean Patent Application No. 10-2017-0127936 filed on September 29, 2017 and Korean Patent Application No. 10-2018-0110670 filed on September 17, 2018, both of which The disclosure content of this application is fully incorporated in this specification by reference. [0003] [technical field] [0004] The present invention relates to a method for preparing an acrylonitrile-based polymer for producing carbon fibers, and more particularly, to a method for preparing an acrylonitrile-based polymer for producing carbon fibers, comprising partially adding free radicals at specific time points polymerization initiator. Background technique [0005] Carbon fiber is a fibrous carbon material containing 90% by weight or more of carbon elements relative to the total weight, and refers to a process prepared by acrylonitrile-based polymers or petroleum or charco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/44D01F9/22C08F2/44
CPCC08F2/06C08F220/44C08F2/04C08F220/14C08F222/02C08F20/44D01F9/22C08F2/44C08F220/46C08F2800/20C08F120/44C08F220/48C08F120/42D01F9/225C08F20/42
Inventor 金昶勋金铉玟祚正训赵峻熙
Owner LG CHEM LTD
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