5-Amide-6-hydroxy-2-(4-carboxylphenyl)benzoxazole salt synthesis method

A p-carboxyphenyl, synthesis method technology, applied in the application field of preparing poly-p-phenylene benzobisoxazole resin, can solve the problems of affecting the molecular weight of PBO, lack of practicability, many reaction steps, etc., and achieve no gas interference and safety hazards, excellent oxidation stability, and high resin intrinsic viscosity
CN101016275BInactive Publication Date: 2010-08-11ZHEJIANG UNIV OF TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV OF TECH
Publication Date
2010-08-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a synthesizing method of 5-amino-6-hydroxy-2-(p-carboxy phenyl) benzoxazole carboxyl ammonium salt (ABAS) and application in the PBO resin, which comprises the following steps: adopting 5-amino-6-hydroxy-2-(p-carboxy phenyl) benzoxazole (MAB) as raw material; hydrolyzing in the solution with alkaline material (alkaline metal carbonate) until the solution is clear at 60-100deg.c protected by inert gas; disposing reacting liquid through sodium bisulfite; evolving crystal as ABAS monomer; setting the weight rate of MAB, alkaline material, putting material in the water at1:1.4-2.0:30-80. The method possesses simple technique and normal equipment to improve product purity over 99%, which shortens polymeric time effectively.
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Description

(1) Technical field The present invention relates to a kind of 5-amino-6-hydroxyl-2-(p-carboxyphenyl) benzoxazole carboxyammonium salt (ABAS), its synthesis method and its use in the preparation of poly-p-phenylene benzobisoxazole (PBO ) application in resin. (2) Background technology PBO is the abbreviation of cis-poly(p-phenylene-2,6-benzobisoxazole), which is the most organic and inorganic fiber by polymer liquid crystal spinning technology. High Performance Fiber - Zylon. Research so far, Japan Toyobo (Toyobo) company patent (patent open 2000-38371) under high shear conditions through (1) formula by 4,6-diaminoresorcinol hydrochloride (DAR) and hydroquinone Formic acid (TPA) polycondensation reaction to obtain PBO resin: Although the obtained Zylon-HM type PBO fiber has exhibited very excellent physical, chemical and mechanical properties, its production equipment requirements are very high, and the process condition control is extremely harsh, which is difficult to...

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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