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Low-defect and high-strength polyacrylonitrile carbon fiber and preparation method thereof

A polyacrylonitrile carbon fiber, polyacrylonitrile technology, applied in the chemical characteristics of fibers, single-component synthetic polymer rayon, textiles and papermaking, etc., can solve the problem of low regularity of acrylonitrile sequence, comonomer reactivity Large differences, uneven distribution of copolymerization units, etc., to achieve the effect of good molecular composition consistency, high chain regularity, and uniform distribution of copolymerization units

Pending Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0003] Since free radical copolymerization is a very complicated process, the obtained acrylonitrile copolymer often has the following disadvantages: (1) the molecular weight is low and the distribution is wide; Large deviation, uneven distribution of copolymerization units; (3) Acrylonitrile sequence regularity is not high, and there are many macromolecular structural defects
This composition and structural defect will cause the quality of the raw silk to be low, thereby inheriting the defect to the carbon fiber, which seriously restricts the improvement of its performance

Method used

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  • Low-defect and high-strength polyacrylonitrile carbon fiber and preparation method thereof
  • Low-defect and high-strength polyacrylonitrile carbon fiber and preparation method thereof
  • Low-defect and high-strength polyacrylonitrile carbon fiber and preparation method thereof

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preparation example Construction

[0031] 1) Preparation of polyacrylonitrile solution

[0032] The polyacrylonitrile solution was prepared according to the polymerization conditions shown in Table 1.

Embodiment 1～19

[0034] Using a certain mass fraction of sodium thiocyanate (NaSCN) aqueous solution as the reaction solvent, azobisisobutyronitrile (AIBN) or azobisisoheptanonitrile (ABVN) as the initiator, S,S'-bis(α,α '-Dimethyl-α"-acetic acid) trithiocarbonate (TRIT) is the RAFT reagent, and acrylonitrile, comonomer, initiator, RAFT reagent and solvent are added to the reactor, and nitrogen gas is introduced to remove oxygen Processing. Then carry out RAFT controllable free radical polymerization under 60~85 ℃, reaction time 6~24 hours.Based on the weight of the whole polymerization system, acrylonitrile dosage is shown in Table 1; The dosage of comonomer, initiator and RAFT reagent are shown in Table 1; the concentration of NaSCN is shown in Table 1; the reaction temperature is shown in Table 1; the reaction time is shown in Table 1.

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Abstract

The invention discloses a low-defect and high-strength polyacrylonitrile carbon fiber and a preparation method thereof. A reversible addition-fragmentation chain transfer (RAFT) polymerization technology is utilized and a trithiocarbonate (TRIT) with a carboxyl functional group is adopted as an RAFT agent, on the one hand, the molecular weight and the distribution of polyacrylonitrile are controlled, and on the other hand, the polyacrylonitrile with a carboxyl group at the tail end is prepared, meanwhile, a second monomer with double functional groups and similar to the acrylonitrile reactivity ratio is adopted for a copolymerization reaction, so that the polyacrylonitrile with higher chain structure regularity and uniform copolymerization unit distribution is obtained, a high-quality rawsilk is prepared, and further the low-defect and high-strength polyacrylonitrile carbon fiber is prepared through pre-oxidation, carbonization and after-treatment.

Description

technical field [0001] The invention relates to a low-defect, high-strength polyacrylonitrile carbon fiber and a preparation method thereof. In particular, it relates to the preparation of polyacrylonitrile solution with high molecular weight and narrow distribution by reversible addition / fragmentation chain transfer (RAFT) radical polymerization process, and the preparation of polyacrylonitrile with carboxyl group at the end by using RAFT reagent with carboxyl functional group. Copolymerize the second monomer with bifunctional groups and similar reactivity ratio with acrylonitrile, so as to obtain polyacrylonitrile with high chain structure regularity and uniform distribution of copolymerized units, and prepare high-quality precursors. Carbonization and post-treatment to prepare low-defect, high-strength polyacrylonitrile carbon fibers. Background technique [0002] The preparation process of polyacrylonitrile carbon fiber is a system engineering involving multiple complex...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F6/38C08F220/44C08F222/16C08F222/38C08F2/38
CPCD01F9/22D01F6/38C08F220/44C08F2/38C08F222/16C08F222/38
Inventor 宋文迪顾文兰季春晓袁玉红吴嵩义黄翔宇
Owner CHINA PETROLEUM & CHEM CORP
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