29-12-2016 дата публикации
Номер: US20160376151A1
Принадлежит:
A high-quality flame-resistant fiber and carbon fiber at low costs in preparing a flame-resistant fiber and a carbon fiber by efficiently performing a flame retardation process in a short time as compared with a conventional technology are described. [1] If a polyacrylonitrile (PAN) polymer is degenerated with an oxidizing agent containing a thiolate compound and a nitrogen atom in a polymer, and the degenerated polymer is formed into threads so as to prepare a flame-resistant PAN fiber. [2] A flame-resistant PAN fiber is prepared by degenerating a PAN precursor fiber in a solution including a thiolate compound and an oxidizing agent containing a nitrogen atom. The flame-resistant PAN fiber obtained by the preparation method is heated at 300° C. or more to 3000° C. or less, and, thus, a carbon fiber having an excellent mechanical strength can be obtained. 1. A preparation method of a polyacrylonitrile flame-resistant fiber , wherein the flame-resistant fiber includes a compound formed by degenerating a polyacrylonitrile polymer with a thiolate compound and having a specific gravity of 1.24 or more to 1.55 or less , as a main component.2. The preparation method of a polyacrylonitrile flame-resistant fiber according to claim 1 , wherein the degeneration is carried out in the presence of an oxidizing agent.3. The preparation method of polyacrylonitrile flame-resistant fiber according to claim 2 , wherein the degeneration is carried out in a solution.4. The preparation method of a polyacrylonitrile flame-resistant fiber according to claim 3 , wherein the solution is a non-protonic polar solvent.5. The preparation method of a polyacrylonitrile flame-resistant fiber according to claim 1 , wherein the thiolate compound is selected from the following general formula (1) or (2):{'br': None, '[Chemical Formula 1]'}{'br': None, 'sub': 1', '1, 'M-S-R\u2003\u2003(1)'}{'sub': 1', '1, 'claim-text': [{'br': None, '[Chemical Formula 2]'}, {'br': None, 'sub': 2', '2', '3, 'R-S-M-S-R\ ...
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