Polyimide fibre containing benzimidazole structure and preparation method thereof

A technology of polyimide fiber and benzimidazole is applied in the field of polyimide fiber containing benzimidazole structure and its preparation field, which can solve the problem of low mechanical properties of PMDA-ODA type polyimide fiber, and achieves Improved mechanical strength, improved heat resistance, and easy control
CN101200822AInactive Publication Date: 2008-06-18SINOSELEN HI TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SINOSELEN HI TECH
Publication Date
2008-06-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses polyimide fiber with benzimidazole structure, which is characterized in that the infrared spectrum of the fiber is provided with character absorption peaks of imide ring of 1776-1774cm<-1>, 1726-1722cm<-1> and 1378-1373cm<-1> within the wave number range of 1300-1800cm<-1> and N-H functional group absorption wide peaks in the imidazole structure within the wave number range of 3000-3750cm<-1>. The tensile strength is 0.73-1.53GPa. The initial modulus is 45.2-220GPa. The invention also provides a preparation method of the fiber. The fiber disclosed by the invention contains the benzimidazole structure with secondary amine hydrogen. Therefore, compared with PMDA-ODA polyimide fiber prepared with the same process, the tensile strength can be improved by nearly three times at the most, the initial modulus can be improved by more than twenty times at the most, and the heat resistance is further improved. The preparation method provided by the invention has the advantages of mature technology and easy control. The cost can be kept at a relative low level.
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Description

technical field

[0001] The invention belongs to the technical field of polyimide fibers and preparation methods thereof, and in particular relates to a polyimide fiber containing a benzimidazole structure and a preparation method thereof. Background technique

[0002] Compared with other high-performance fibers, polyimide fiber (PI) is expected to be used in the atomic energy industry, space and It has been widely used in very harsh research in the fields of environment, rescue needs, aerospace, national defense construction, new construction, high-speed transportation, marine development, sports equipment, new energy, environmental industry and protective equipment.

[0003] The preparation method of existing polyimide fiber generally comprises one-step method and two-step method technology, and its technological process is as follows figure 1 shown. One-step method is to use polyimide solution to directly spin to prepare polyimide fiber. Such as Chinese invention patent...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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