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Preparation method of styrene-N-phenylmaleimide copolymer

A maleimide copolymer and maleimide technology are applied in the field of preparation of styrene-N-phenylmaleimide copolymers, and can solve the problems of poor polymerization degree, complicated steps, low molecular weight, etc. problem, to achieve the effect of saving time, increasing content, and simple preparation method

Inactive Publication Date: 2013-04-24
JIH NONG SCI
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Problems solved by technology

But the processing method of styrene-N-phenylmaleimide copolymer at present, step is quite numerous and diverse, and styrene and N-phenylmaleimide two kinds of monomer polymerizations very easily take place alternate copolymerization; When reaction If the temperature is too high, it will also affect the homogeneity of the copolymerization composition of styrene and N-phenylmaleimide, and the reaction is not easy to control, and it is easy to form explosives
All of the above will lead to a poor degree of polymerization with styrene during the reaction, and also cause the phenomenon of low molecular weight of styrene-N-phenylmaleimide copolymer (molecular weight is about 2000 to 10000), and styrene-N -Phenylmaleimide copolymer low molecular weight and alternating polymerization characteristics will limit the application range of styrene-N-phenylmaleimide copolymer

Method used

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  • Preparation method of styrene-N-phenylmaleimide copolymer

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Embodiment

[0023] In the reactor, add 500 milliliters (ml) of methyl isobutyl ketone, 103 grams (g) of maleic anhydride, 5 grams (g) of p-toluenesulfonic acid, 20 grams ( g) Dimethylformamide and 0.5 grams (g) of methoxyhydroquinone, heated at 100°C to 120°C to completely dissolve the powder, forming a maleic anhydride mixture; Gradually add 93 grams (g) of aniline to the heat-treated maleic anhydride mixture in one hour and reflux dehydration at the same time. After standing for 10 minutes to separate the layers, add 250 milliliters (ml) of water and 10% to the oil layer. After 20% sodium hydroxide (NaOH) is neutralized at 50°C to 60°C, stir for 10 to 30 minutes, and after standing to separate layers, add 250 milliliters (ml) of water to the oil layer and wash it to obtain N-phenylmethane imide solution.

[0024]After cooling the N-phenylmaleimide solution to 50°C to 80°C, under nitrogen, directly add 100 grams (g) of styrene to the N-phenylmaleimide solution to form a reaction mixture...

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Abstract

The invention provides a preparation method of a styrene-N-phenylmaleimide (SMI) copolymer with a high molecular weight. The method comprises: adding aniline gradually into a heat treated maleic anhydride (MA) mixture, conducting reflux dehydration, layering, alkali neutralization and washing to obtain N-phenyl maleimide (PMI), then adding styrene directly and mixing them, and adding an initiator and an organic solvent gradually, thus obtaining the high molecular weight styrene-N-phenylmaleimide copolymer.

Description

technical field [0001] The present invention relates to a preparation method of styrene-N-phenylmaleimide copolymer (styrene-N-phenylmaleimide copolymer, SMI), especially a kind of preparation method of high molecular weight styrene-N-phenyl The preparation method of maleimide copolymer. Background technique [0002] N-phenyl maleimide (N-phenyl maleimide, PMI) is synthesized from maleic anhydride (maleic anhydride, MA) and aniline (aniline). Currently, N-phenyl maleimide is It is used as a heat-resistant modifier for acrylonitrile butadiene styrene resin (ABS resin), but due to the poor compatibility of N-phenylmaleimide and ABS matrix, it is currently Gradually, N-phenylmaleimide is replaced by styrene-N-phenylmaleimide copolymer (styrene-N-phenylmaleimide copolymer, SMI). [0003] Styrene-N-phenylmaleimide copolymer is obtained by copolymerization of N-phenylmaleimide and styrene. As mentioned earlier, in addition to being used as a heat-resistant modifier for ABS resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F234/00C08F2/06
Inventor 陈鸿文刘汉滨陈奕瀚
Owner JIH NONG SCI
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