A kind of method by controlling pre-oxidized fibers structure to prepare high-performance carbon fibre

A kind of method by controlling pre-oxidized fibers structure to prepare high-performance carbon fibre

  • CN 103,668,561 B
  • Filed: 12/03/2013
  • Issued: 06/23/2017
  • Est. Priority Date: 12/03/2013
  • Status: Active Grant
First Claim
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1. a kind of method by controlling pre-oxidized fibers structure to prepare high-performance carbon fibre, including pre-oxidation, carbonisation, itsIt is characterised by:

  • The fiber of the pre-oxidation treatment is polyacrylonitrile fibril, and the temperature of the preoxidation process is 180~275 DEG C, is always ledIt is 4~12% to stretch rate, and controls 16~23 minutes fiber retention time, to produce pre-oxidation fine in 245~255 DEG C of warm areaDimension;

    Using the structural integrity Ro of pre-oxidized fibers as the aggregated structure Con trolling index of fiber after modification, R is selectedONumberIt is worth the oxidized fibre in the range of 34~42%;

    The RO=I1600cm-1/(I1600cm-1+I1350cm-1), wherein I1600cm-1It is 1600cm in Raman spectrum-1The peak area product at placeDivide intensity, I1350cm-1It is 1350cm in Raman spectrum-1The integrating peak areas intensity at place;

    Then pre-oxidized fibers are carried out with carbonization treatment, the carbonisation is the low-temperature carbonization carried out under high pure nitrogen protectionTreatment and high temperature cabonization treatment, the low-temperature carbonization treatment, warm area are respectively set as 380,480,600 and 700 DEG C, and fiber is everyThe residence time of individual warm area is 0.9 minute, and 3.6 minutes altogether, degree of draft was 5%;

    The high temperature cabonization treatment, at 1300 DEG CUnder, the residence time is 2.5 minutes;

    Degree of draft is 2.5%;

    Tensile strength >

    =the 3.6GPa of obtained carbon fiber, stretch modulus >

    =250Gpa.

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