Polyimide polymer preparation method
A technology of polyimide and high polymer, which is applied in the field of preparation of polyimide high polymer, can solve the problems of cumbersome operation and high cost, and achieve the effects of simplified feeding steps, reduced production cost and simple preparation method
Active Publication Date: 2016-02-03
SUZHOU TAIHU ELECTRIC ADVANCED MATERIAL CO LTD
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Problems solved by technology
In addition to the preparation of a mixed solvent with a high boiling point, the one-step synthesis method also requires a suitable capping agent for the capping reaction. The operation is cumbersome and costly
Method used
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Embodiment 1 to 3
[0033]In the four-necked flask equipped with mechanical stirring and condenser, add 38.4g of trimellitic anhydride (TMA), 90mL of 1-methyl-2-pyrrolidone, stir evenly at T1 temperature, after TMA is completely dissolved, add 0.75mL of formic acid, and then Add 51g xylene diisocyanate (MDI) in three times, each time adding 17g, the time interval is Δt, then, keep the temperature at T2 temperature for a period of time, and the time is recorded as t2; keep the temperature at T3 temperature for a period of time, and the time is recorded as t3 Constant temperature for a period of time at T4 temperature, the time is recorded as t4; Constant temperature for a period of time at T5 temperature, the time is recorded as t5, stop the reaction, cool and discharge, the feed liquid is a dark brown transparent liquid.
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Abstract
The invention relates to a polyimide polymer preparation method. The polyimide polymer preparation method comprises the following steps: dissolving trimellitic anhydride in 1-methyl-2-pyrrolidone; then, adding diphenyl-methane-diisocyanate and a catalyst; controlling proceeding of reaction by the staged heating method to prepare a polyimide polymer, wherein the feeding molar ratio of trimellitic anhydride to diphenyl-methane-diisocyanate is 1:(1-1.2). According to the polyimide polymer preparation method, a one-step synthesis process is adopted, trimellitic anhydride and diphenyl-methane-diisocyanate with a certain ratio are selected in a proper solvent, and under the action of the catalyst, heating reaction is realized by the staged heating method to prepare polyimide. The polyimide polymer preparation method is very simple, dispenses with harsh reaction conditions and excessive reagents and experimental steps, and can adjust the molecular mass of prepared polyimide by controlling the reaction temperature and time.
Description
technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a polyimide polymer. Background technique [0002] With the rapid development of aerospace, electronic information, automobile industry, household appliances and many other technical fields, the requirements for materials are also getting higher and higher. High performance, multi-functionality, light weight and low cost have become the general direction of material development. Polyimide is a material with excellent comprehensive properties. It is a kind of polymer material with imide ring on the main chain. As the main chain contains aromatic rings, as an advanced composite material matrix, it has outstanding temperature resistance and excellent mechanical properties, and is currently one of the materials with the highest temperature resistance among resin-based composite materials. As an electronic information material, polyimid...
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IPC IPC(8): C08G73/10
Inventor 屈永明井丰喜石兆丛夏媛娇张春琪夏智峰
Owner SUZHOU TAIHU ELECTRIC ADVANCED MATERIAL CO LTD
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