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

Inactive Publication Date: 2013-01-09
SHANGHAI DIAIBI CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because ordinary PBI resin can only be dissolved in strong acids such as sulfuric acid, processing is very difficult, and the molding technology and fiber drawing technology of PBI castings are only in the hands of a few developed countries such as the United States.

Method used

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  • Preparation method of aromatic polybenzimidazole
  • Preparation method of aromatic polybenzimidazole
  • Preparation method of aromatic polybenzimidazole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 680g of phosphorus pentoxide into 5000ml of methanesulfonic acid, heat up to 140°C, blow nitrogen and start stirring until the phosphorus pentoxide is completely dissolved. Add 214g of 3,3',4,4'-tetraaminobiphenyl and 202g of sebacic acid and stir for 1h to obtain a viscous liquid. Pour the above viscous liquid into water to precipitate the polymer, and then wash the polymer repeatedly for more than three times; then, soak it in 10% sodium bicarbonate for 48 hours and take it out; after that, soak it in boiling water containing sodium hydrosulfite; In this embodiment, the hydrosulfite is a kind of sodium thiosulfate; for example: after washing the precipitated polymer repeatedly, soak it with 10% sodium bicarbonate for 48 hours, take it out, and then soak it in a solution containing 0.5% thiosulfuric acid Sodium boiling aqueous solution for 5 hours, take out the polymer; then put it in a vacuum environment of 60-80 ℃ and dry for 24 hours to obtain polybenzimidazole ...

Embodiment 2

[0033] Add 680g of phosphorus pentoxide to 5000ml of methanesulfonic acid, heat up to 100°C, blow nitrogen and start stirring until phosphorus pentoxide is completely dissolved, add 278g of 3,3',4,4'-tetraaminobiphenyl sulfone, 258g 4,4'-dicarboxydiphenyl ether was stirred and reacted for 20 minutes to obtain a viscous liquid. The above-mentioned viscous liquid is poured into water to precipitate a polymer, and the polymer is soaked in 15% sodium carbonate for 36 hours after repeated washing and taken out; after that, it is soaked in boiling water containing sodium hydrosulfite; in this embodiment, its insurance The powder is a kind of sodium dithionite; for example: after washing the precipitated polymer repeatedly with water, soak it in 15% sodium carbonate for 36 hours, take it out, then soak it in a boiling aqueous solution containing 2% sodium dithionite for 1 hour, take out the polymer and put it in Drying in a vacuum environment at 90-120° C. for 12 hours to obtain poly...

Embodiment 3

[0035] Add 1360g of phosphorus pentoxide into 10000ml of methanesulfonic acid, heat up to 130-150°C, blow nitrogen and start stirring until phosphorus pentoxide is completely dissolved, add 428g of 3,3',4,4'-tetraaminobiphenyl, 202g of sebacic acid and 258g of 4,4'-dicarboxydiphenyl ether were stirred and reacted for 30 minutes to obtain a viscous liquid. Pour the above-mentioned viscous liquid into water to precipitate a polymer, which is soaked in 10% sodium bicarbonate for 58 hours after repeated washing and then taken out; after that, soak in boiling water containing sodium hydrosulfite; in this embodiment, its Sodium hydrosulfite is a kind of sodium dithionite; for example: after washing the precipitated polymer repeatedly, soak it in 10% sodium bicarbonate for 58 hours, take it out, then soak it in a boiling water solution containing 3% sodium dithionite for 1 hour, take out the polymer The material was dried under a vacuum environment at 100-110° C. for 48 hours to obta...

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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.

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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/18
Inventor 滕鑫顾晓军
Owner SHANGHAI DIAIBI CHEM TECH
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