Maleimide copolymer and synthetic method thereof

A maleimide copolymer, maleimide technology, applied in the field of maleimide-aromatic olefin-maleic acid or maleic anhydride copolymer and its synthesis, can solve the problem of insufficient polymerization, single Problems such as increased body residues

Active Publication Date: 2009-09-23
SHANGHAI HUAYI GRP CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the ratio of maleimide monomer to the total amount of monomer mixture is greater than 45% (w / w), the maleimide monomer is difficult to fully dissolve, resulting in insufficient polymerization, and the residual amount of monomer is greatly increased

Method used

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  • Maleimide copolymer and synthetic method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] Add 150g of N-phenylmaleimide, 170g of styrene, 5g of maleic anhydride and 0.50g of chain transfer agent n-butanethiol into the reaction flask, and stir to dissolve the monomers at a water bath temperature of 45°C. After completely dissolving, add 4.25 g of initiator azobisisobutyronitrile and mix well. Then the liquid was poured into 55°C dispersant aqueous solution (870g deionized water and 50g sodium methacrylic acid), and after stirring evenly, the temperature of the system was raised to 75°C for 5 hours. After the polymer obtained by the reaction was washed with clear water for several times, it was vacuum-dried to obtain a light yellow granular product. The calculated yield of the product was 93.4%; DSC test Tg = 205.7°C; GPC test molecular weights were: Mn = 84081, Mw = 171119, molecular weight distribution pI = 2.15, residual monomer content 2734ppm.

Embodiment 2

[0108] Add 180g of N-phenylmaleimide, 190g of styrene, 8g of maleic anhydride and 0.70g of chain transfer agent isopropanol into the reaction flask, and stir to dissolve the monomer at a water bath temperature of 55°C until the monomer is completely After dissolving, add 5.65 g of initiator dibenzoyl peroxide and mix well. Then the liquid was poured into 55°C dispersant aqueous solution (940g deionized water and 50g polyvinyl alcohol). After stirring evenly, the temperature of the system was raised to 75°C for 3 hours, and then to 80°C for 2 hours. . After the polymer obtained by the reaction was washed with clear water for several times, it was vacuum-dried to obtain a light yellow granular product. The calculated yield of the product is 94.1%; DSC test Tg = 201.8 ° C, GPC test molecular weights are: Mn = 87195, Mw = 187386, molecular weight distribution pI = 2.15, monomer residue 2821ppm.

Embodiment 3

[0110] Add 255g of N-phenylmaleimide, 265g of styrene, 12g of maleic anhydride and 1.10g of chain transfer agent tertiary dodecyl mercaptan into the reaction flask, and stir to dissolve the monomer at a water bath temperature of 50°C. After the monomer was completely dissolved, 8.05 g of initiator azobisisoheptanonitrile was added and mixed uniformly. Then the liquid was poured into 50°C dispersant aqueous solution (1350g deionized water and 110g calcium carbonate), and after stirring evenly, the temperature of the system was raised to 75°C for 5 hours. After the polymer was washed several times with clear water, it was vacuum-dried to obtain a pale yellow granular product. The calculated yield of the product is 93.9%; DSC test Tg = 200.6°C, GPC test molecular weights are: Mn = 62684, Mw = 127696, molecular weight distribution pI = 2.04, residual monomer content 2768ppm.

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Abstract

The invention provides a maleimide copolymer which comprises the following components: 30% to 55% (w / w) of maleimide, 40% to 69.9% (w / w) of aromatic olefins and 0.1% to 5% (w / w) of maleic acid or maleic anhydride. The maleimide copolymer is prepared by the suspension polymerization method, wherein, the Tg temperature (glass transition temperature) thereof can reach over 200 DEG C; the color thereof can be significantly improved; the residual content of monomers is lower than 3,000ppm; and neither acrylonitrile nor acrylate is involved in the synthesis process as monomers, thereby effectively improving the production environment and improving the industrial applicability.

Description

technical field [0001] The invention relates to a maleimide copolymer, in particular to a maleimide-aromatic olefin-maleic acid or maleic anhydride copolymer and a synthesis method thereof. Background technique [0002] General-purpose elastic rubber-like polymer materials, such as: acrylonitrile-butadiene-styrene copolymer (acrylonitrile-butadiene-stryene, ABS) resin, generally in an environment higher than 100 ° C, it is difficult to maintain its rigidity and flexibility. High hardness characteristics. Extensive research has found that if the thermal denaturation temperature (Tg) of such a polymer material can be slightly increased, its application range can be greatly expanded. A simple and effective way to increase the thermal denaturation temperature is to add heat-resistant modifiers to polymer materials. Taking ABS as an example, it only needs to increase its Tg temperature by 15-25°C to significantly enhance its heat resistance, thereby maintaining the characterist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/40C08F222/02C08F222/08C08F2/18C08F2/38
Inventor 高慧敏揭元萍陆懿吴梓新余宏华
Owner SHANGHAI HUAYI GRP CO
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