Polyimide fiber spinning stock solution based on 2,2-bis[4-(2,4-diaminophenoxy) phenyl] propane and preparation method thereof

Abstract

The invention relates to a polyimide fiber spinning stock solution based on 2,2-bis[4-(2,4-diaminophenoxy) phenyl] propane and a preparation method thereof. The spinning stock solution has a structural formula shown in the specification. The preparation method comprises the following steps of: adding 2,2-bis[4-(2,4-diaminophenoxy) phenyl] propane and a high-polarity aprotic solvent into a reaction kettle, and dissolving with stirring at room temperature; adding phthalic anhydride, reacting with stirring for 0.5 hour, and cooling to the temperature of 5 DEG C in ice-water bath; adding 3,3',4,4'-tetracarboxylicdiphenyl ether dianhydride, and reacting with stirring for 0.5 hour; and adding pyromellitic dianhydride, keeping the reaction temperature below 5 DEG C, and reacting with stirring for 2 to 4 hours to obtain the polyimide fiber spinning stock solution. According to the polyimide fiber spinning stock solution, the molecular weight of resin is easy to control, a molecular structure is easy to adjust, and high-performance polyimide fibers with ideal performance are easy to prepare; and according to the preparation method, reaction conditions are mild, and the industrialization of products is facilitated.

Description

technical field [0001] The invention belongs to the field of polyimide fiber spinning stock solution and its preparation, in particular to a polyimide fiber based on 2,2-bis[4-(2,4-diaminophenoxy)phenyl]propane Spinning dope and its preparation method. Background technique [0002] Polyimide is a kind of polymer material with excellent comprehensive properties. It has particularly excellent heat resistance, low temperature resistance, flame retardancy, electrical properties and mechanical properties. It is widely used in electronic microelectronics, aerospace, High-tech fields such as lasers and optoelectronics. [0003] There have been many reports on the research and development work in the field of polyimide resins: [0004] Yu Xinhai et al [Synthesis of Polythioetherimide Resin and Development of Modified Epoxy Adhesive [J]. Bonding, 2009, 30(6): 34-38] disclosed a 4,4′ - the preparation method of bis(4-aminophenoxy) diphenyl sulfide and its polythioetherimide resin, ...

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Problems solved by technology

[0022] At present, developed countries such as the United States and Russia are stepping up research on polyimide fibers. Because high-strength and high-modulus polyimide fibers are reinforcing agents for advanced composite materials, they are used in the manufacture of aviation, spacecraft and rockets. There are few, but the research on this fiber in developed countries has never been interrupted

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