Preparation method of aromatic polybenzimidazole

A polybenzimidazole and aromatic technology, applied in the field of polymer resin preparation, can solve problems such as processing difficulties, and achieve the effects of good thermal stability, high molecular weight, and low equipment requirements
CN102863620AInactive Publication Date: 2013-01-09SHANGHAI DIAIBI CHEM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI DIAIBI CHEM TECH
Publication Date
2013-01-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of aromatic polybenzimidazole, comprising the following steps: 1, under the protection of nitrogen, adding aromatic tetramine and diacid monomer with equimolar ratio in a strongly acidic solution to conduct condensation polymerization with the reaction temperature of 100-250 DEG C and the reaction time of 0.5-30h; 2, pouring the product of the step 1 in water and precipitating to obtain a polymer, washing the polymer with water repeatedly, immersing in an alkaline solution to remove residual acid, and then immersing in boiling water containing rongalite for 0.5-6h; and 3, drying the product of the step 2 in a vacuum environment with the temperature of 50-150 DEG C to obtain the aromatic polybenzimidazole. The method has the advantages of high molecular weight, good thermal stability, excellent dissolubility and film forming property, etc.
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Description

technical field

[0001] The invention belongs to the technical field of polymer resin preparation, and in particular relates to a preparation method of aromatic polybenzimidazole. Background technique

[0002] Polybenzimidazole, English name Polybenzimidazoles, referred to as PBI, is an amorphous special engineering plastic. PBI is a high-performance resin jointly developed by NASA and the U.S. Air Force Materials Laboratory. It has excellent high temperature resistance, low temperature resistance, mechanical properties and flame retardancy. Acid-base is a high-performance resin material with great application prospects. Its application fields involve many high-tech fields such as aerospace, optics, and microelectronics. With the needs of technological development, the application field of PBI has gradually shifted to civilian use. However, because ordinary PBI resin can only be dissolved in strong acids such as sulfuric acid, it is very difficult to process, and the moldin...

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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