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Preparation method of maleimide copolymer, maleimide copolymer and maleimide composition

A maleimide-based, maleamic acid technology, applied in textiles, papermaking, papermaking, coatings, etc., can solve the problems of difficult to control the appearance of solid products, increase production costs, and control a large number of costs, and reduce Environmental burden, high degree of imidization, fast and efficient aminolysis

Active Publication Date: 2021-10-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the maleic anhydride copolymers obtained by traditional polymerization methods (solution polymerization, etc.) generally do not have a high specific surface area, it is difficult for gas to enter the interior of the solid polymer, and the polymer needs to be ground and refined, and a higher reaction temperature is required Only with a long time of reaction can a higher degree of imidization be achieved (such as non-patent literature 5), which increases production costs and lower production efficiency
[0006] In addition, in the above-mentioned patent documents and non-patent documents, when it is necessary to use a solid maleimide copolymer, the obtained maleimide copolymer needs to go through processes such as crushing, grinding or refining. To obtain a solid product, and there is a problem that it is difficult to control the shape of the obtained solid product or a large amount of cost needs to be invested to control the shape of the solid product

Method used

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  • Preparation method of maleimide copolymer, maleimide copolymer and maleimide composition

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preparation example Construction

[0039] The preparation method of maleimide copolymer of the present invention comprises: a) adding the raw material that comprises comonomer, maleic anhydride, initiator in the organic solvent, makes described comonomer and described maleic anhydride carry out Reaction, to obtain maleic anhydride-based copolymer microspheres; b) amination of the maleic anhydride-based copolymer microspheres in an atmosphere of an amination gas, to obtain maleamic acid-based copolymer microspheres; c) The maleamic acid-based copolymer microspheres obtained in step b) are heated to obtain microspherical maleimide-based copolymers.

[0040] The raw materials and steps of the present invention will be described in detail below.

[0041]

[0042] In step a), raw materials including comonomer, maleic anhydride, and initiator are added to an organic solvent, so that the comonomer reacts with the maleic anhydride to separate maleic anhydride-based copolymer microspheres .

[0043] For the applicab...

Embodiment 1

[0087] Dissolve 13g of styrene and 12.25g of maleic anhydride in 200g of isoamyl acetate, add 0.2525g of dibenzoyl peroxide and react at 70°C for 3 hours. After the reaction, the product was centrifuged at 6000r / min for 10 minutes, washed with petroleum ether, centrifuged three times, and vacuum-dried to constant weight to obtain styrene-maleic anhydride copolymer microspheres. The average particle size of the microspheres is 800nm ​​and the molecular weight is 65000. 10 g of the copolymer was added into a stainless steel reaction kettle, and 2 g of ammonia gas was introduced. Control the reaction temperature to 20° C., and react for 45 minutes to obtain styrene-maleamic acid copolymer microspheres. The product was analyzed by acid-base titration, and the amination rate of the maleic anhydride group was 99%. The stainless steel reaction kettle containing the styrene-maleamic acid copolymer microspheres was heated to 180° C., and reacted for 0.5 hour to obtain the maleimide c...

Embodiment 2

[0089] Dissolve 13g of styrene and 12.25g of maleic anhydride in 200g of isoamyl acetate, add 0.2525g of dibenzoyl peroxide and react at 70°C for 3 hours. After the reaction, the product was centrifuged at 6000r / min for 10 minutes, washed with petroleum ether, centrifuged three times, and vacuum-dried to constant weight to obtain styrene-maleic anhydride copolymer microspheres. The average particle size of the microspheres is 800nm ​​and the molecular weight is 65000. 10 g of the copolymer was added into a stainless steel reaction kettle, and 3 g of methylamine gas was introduced. Control the reaction temperature to 30° C., and react for 0.5 hour to obtain styrene-maleamic acid copolymer microspheres. The product was analyzed by acid-base titration, and the amination rate of the maleic anhydride group was 98%. The temperature of the stainless steel reaction kettle containing the styrene-maleamic acid copolymer microspheres was increased to 160° C., and reacted for 3 hours to...

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Abstract

The invention relates to a preparation method of a maleimide copolymer, a maleimide copolymer and a maleimide composition. The preparation method of maleimide copolymer of the present invention comprises: a) adding the raw material that comprises comonomer, maleic anhydride, initiator in the organic solvent, makes described comonomer and described maleic anhydride carry out Reaction, to separate out maleic anhydride series copolymer microsphere; b) make described maleic anhydride series copolymer microsphere amination under the atmosphere of amination gas, to obtain maleamic acid series copolymer microsphere, amination The ratio is above 75%; c) heating the maleamic acid copolymer microspheres obtained in step b) to obtain microspherical maleimide copolymers.

Description

technical field [0001] The invention relates to a preparation method of a maleimide copolymer, a maleimide copolymer and a maleimide composition. Background technique [0002] The maleic anhydride copolymer has highly active anhydride groups, which can react with various substances to obtain various modified products of amidation, imidization and esterification. Among these modified products, maleimide-based copolymers obtained through imidization modification can have excellent thermal stability, water resistance, and mechanical properties, and have attracted extensive attention. For example, maleimide copolymers can be blended with various polymer materials such as acrylonitrile-butadiene-styrene copolymer (ABS) and polyvinyl chloride (PVC) to improve heat resistance; maleimide The imide copolymer can also be used as a coating material on the metal surface to play the role of heat resistance, insulation and waterproof. [0003] Traditionally, there are two main methods f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/32C08F212/08C08F212/12C08F222/08C08F289/00C08F222/06C08F212/36D21H21/16D21H19/20C08L55/02C08L27/06C08L35/06
CPCC08F8/32C08L27/06C08L55/02C08L2201/08D21H19/20D21H21/16C08F212/08C08F222/08C08F212/12C08F289/00C08F222/06C08F212/36C08L35/06
Inventor 杨万泰陈楚轩赵长稳徐灿陈冬马育红
Owner BEIJING UNIV OF CHEM TECH
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