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Method for preparing carbon fiber containing polybenzimidazole compound material

A technology for polybenzimidazole and composite materials, which is applied in the field of preparation of polybenzimidazole composite materials, can solve the problems of complicated operation, influence on mechanical properties of composite materials, oxidation of polybenzimidazole, etc., and achieves simple process and convenient large-scale Production, reducing the effect of oxidation

Active Publication Date: 2011-08-31
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the operations of preheating, removing impurities, and hot pressing sintering are carried out sequentially in two furnaces, and the operation is cumbersome; and the operation process of transferring polybenzimidazole powder and mold after removing impurities is easy to cause oxygen in the air. Re-adsorption on the surface of polybenzimidazole may cause polybenzimidazole to be partially oxidized during hot pressing and sintering, which will affect the mechanical properties of the composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 1000mL polyphosphoric acid (H 6 P 4 o 13 ) and 2g carbon dioxide fibers. The above solution was sonicated for 60 minutes and stirred at room temperature for 4 hours. Then the flask was transferred to a silicone oil bath, and the temperature was raised to 100-105°C. Under the protection of nitrogen, slowly add 60.611g (0.153mol) 3 in the flask, 3'-diaminobenzidine diamine dihydrate tetrahydrochloride (C 12 h 14 N 4 2H 2 (0.4HCl), 24.9195g (0.15mol) isophthalic acid (C 8 h 6 o 4 ) and 100g phosphorus pentoxide. After the feeding is completed, keep the temperature at 165-175°C for 1 hour until the material is completely dissolved. Then react at 190-200° C. for 12 hours under the protection of nitrogen. After the reaction is finished, it is washed with water, 1-5% potassium hydroxide solution, water and methanol successively, filtered, and the filter cake is dried in a vacuum drier to obtain polybenzimidazole containing carbon fibers.

[0020] The polybenzi...

Embodiment 2

[0022] Add 1000mL polyphosphoric acid (H 6 P 4 o 13 ) and 2g carbon dioxide fibers. The above solution was sonicated for 60 minutes and stirred at room temperature for 4 hours. Then the flask was transferred to a silicone oil bath, and the temperature was raised to 100-105°C. Under the protection of nitrogen, slowly add 60.611g (0.153mol) 3 in the flask, 3'-diaminobenzidine diamine dihydrate tetrahydrochloride (C 12 h 14 N 4 2H 2 (0.4HCl), 29.1285g (0.1500mol) dimethyl terephthalate (C 10 h 10 o 4 ) and 100.00 g of phosphorus pentoxide. After the feeding is complete, raise the temperature to 160-170°C and keep the temperature constant for about 1 hour until the material is completely dissolved. Then react at 200° C. for 12 hours under the protection of nitrogen. After the reaction is finished, it is washed with water, 1-5% potassium hydroxide solution, water and methanol successively, filtered, and the filter cake is dried in a vacuum drier to obtain polybenzimidaz...

Embodiment 3

[0025] Add 1000mL polyphosphoric acid (H 6 P 4 o 13 ) and 1.8g oxidized carbon fiber. The above solution was sonicated for 60 minutes and stirred at room temperature for 4 hours. Then the flask was transferred to a silicone oil bath, and the temperature was raised to 100-105°C. Under nitrogen protection, slowly add 48.9355g (0.1530mol) 1,2,4,5-tetraaminobenzene dihydrate tetrahydrochloride (C 6 h 10 N 4 2H 2 (0.4HCl), 24.9195g (0.1500mol) isophthalic acid (C 8 h 6 o 4) and 100.00 g of phosphorus pentoxide. After the feeding is complete, raise the temperature to 160-170°C and keep the temperature constant for about 1 hour until the material is completely dissolved. Then, it was kept at 200° C. for 12 hours under the protection of nitrogen. After the reaction is finished, it is washed with water, 1-5% potassium hydroxide solution, water and methanol successively, filtered, and the filter cake is dried in a vacuum drier to obtain polybenzimidazole containing carbon fi...

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Abstract

The invention discloses a method for preparing a carbon fiber containing polybenzimidazole compound material. The method comprises the following steps that: polybenzimidazole is polymerized in situ on the surface of the carbon oxide fiber to form carbon fiber containing polybenzimidazole; and the carbon fiber containing polybenzimidazole undergoes hot pressed sintering in a vacuum hot pressed sintering furnace for one-time formation to form the carbon fiber containing polybenzimidazole compound material. The method has the advantages of overcoming defects of uneven distribution of carbon fiber filling materials and poor shearing stress between the polybenzimidazole and the carbon fiber filling materials, along with simple and convenient operation, simple equipment and process and the suitability for mass production. The compound material prepared by the method has good mechanical property and wide industrial values and application prospect.

Description

technical field [0001] The invention relates to a preparation method of polybenzimidazole composite material containing carbon fiber. Background technique [0002] Polybenzimidazole has good thermal stability, chemical stability, self-lubricating properties, low density and excellent high-temperature mechanical properties, making it of great use under harsh conditions, especially in the aerospace field. Polybenzimidazole has the highest hardness among polymer plastics, and has good tensile and compressive strength. However, polybenzimidazole has poor impact resistance and cannot be used in occasions with missing corners. Although some methods (U.S. Patent 4,861,537,1989; U.S. Patent 4,814,530,1989; U.S. Patent 5,229,448,1993.) to enhance the mechanical properties of polybenzimidazole composites have been announced, such as metal powder, glass microspheres, chopped carbon fibers, etc. The filler is filled into polybenzimidazole by mechanical mixing method to prepare polyben...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/04C08K7/06C08G73/18B29C70/40B29K307/04B29K79/00
Inventor 陈建敏卢艳华周惠娣
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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