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Preparation method of N-phenyl maleimide heat-resistant modifier

A technology of maleimide and heat-resistant modifier, applied in the field of preparation, can solve the problems such as the inability to effectively control the molecular weight and molecular weight distribution of the polymer, and achieve a mild and easy control of the reaction process, simple process and convenient control. Effect

Active Publication Date: 2014-12-17
江苏科利新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not use N-phenylmaleimide as a raw material, but it is prepared by a common free radical polymerization mechanism, which cannot effectively control the molecular weight and molecular weight distribution of the polymer. The molecular weight distribution of the obtained polymer is generally above 1.5.

Method used

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  • Preparation method of N-phenyl maleimide heat-resistant modifier

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Effect test

Embodiment 1

[0022] In a polymerization bottle with a reflux and stirring device, add 1.1mol styrene, 0.5mol maleic anhydride, 0.001mol azobisisobutyronitrile, 0.001mol dimethyl trithiocarbonate, 0.001mol 2-methyl-di Thiobenzimidazole benzyl ester and 1L cyclohexanone were reacted at 70°C for 5 hours under nitrogen protection, cooled to 60°C, added 0.45mol aniline, 0.009mol acetic anhydride and 0.001mol sodium acetate, and heated to 130°C for reaction 5 Hours, cool down to room temperature, pour the reactant into ethanol to precipitate the polymer, and then filter and dry to obtain the finished product.

[0023] The number-average molecular weight of the polymer obtained in this embodiment is 25×10 4 , the molecular weight distribution is 1.23.

Embodiment 2

[0025] In a polymerization bottle with a reflux and stirring device, add 1.1mol styrene, 0.6mol maleic anhydride, 0.001mol azobisisobutyronitrile, 0.003mol dimethyl trithiocarbonate, 0.003mol 2-methyl-di Thiobenzimidazole benzyl ester and 1L cyclohexanone were reacted at 75°C for 3 hours under the protection of nitrogen, cooled to 60°C, added 0.54mol aniline, 0.018mol acetic anhydride and 0.002mol sodium acetate, and heated to 140°C for reaction 4 Hours, cool down to room temperature, pour the reactant into ethanol to precipitate the polymer, and then filter and dry to obtain the finished product.

[0026] The number-average molecular weight of the polymer obtained in this embodiment is 21×10 4 , the molecular weight distribution is 1.18.

Embodiment 3

[0028] In a polymerization bottle with a reflux and stirring device, add 1.2mol styrene, 0.6mol maleic anhydride, 0.005mol azobisisobutyronitrile, 0.003mol dimethyl trithiocarbonate, 0.003mol 2-methyl-di Thiobenzimidazole benzyl ester and 1L cyclohexanone were reacted at 80°C for 3 hours under nitrogen protection, cooled to 60°C, added 0.54mol aniline, 0.027mol acetic anhydride and 0.003mol sodium acetate, and heated to 140°C for reaction 4 Hours, cool down to room temperature, pour the reactant into ethanol to precipitate the polymer, and then filter and dry to obtain the finished product.

[0029] The number-average molecular weight of the polymer obtained in this embodiment is 18×10 4 , the molecular weight distribution is 1.15.

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Abstract

The invention discloses a preparation method of an N-phenyl maleimide heat-resistant modifier. The preparation method comprises the following steps: adding styrene, maleic anhydride, azodiisobutyronitrile, trithio dimethyl carbonate and 2-methyl-dithiobenzimidazole benzyl ester to form a polymerization system; carrying out a polymerization reaction for 2-6 hours at 60-120 DEG C under nitrogen protection; then, cooling to 60 DEG C, adding aniline, acetic anhydride and sodium acetate, and raising the temperature to 100-150 DEG C to react for 2-6 hours; and finally, cooling to room temperature, pouring the reactants into ethanol to settle a polymer, and filtering and drying to obtain a finished product. Through the above manner, the molecular weight and distribution of the product of the polymerization reaction can be conveniently controlled. The molecular weight of the prepared polymer is distributed below 1.3. Comparatively speaking, the molecular weight distribution is relatively narrow, the process is relatively simple, and the N-phenyl maleimide heat-resistant modifier has a relatively high economic value.

Description

technical field [0001] The invention relates to a preparation method of a heat-resistant modifier with good heat resistance, in particular to a method for preparing N-phenylmaleimides with narrow molecular weight distribution by adopting reversible addition-fragmentation chain transfer polymerization A preparation method of a heat-resistant modifier. Background technique [0002] ABS (Acrylonitrile butadiene Styrene copolymers, acrylonitrile-butadiene-styrene copolymer) resin is one of the five major synthetic resins, with excellent comprehensive properties such as impact resistance, low temperature resistance, chemical resistance, easy processing and good surface gloss . Therefore, it has a wide range of applications in the fields of automobile industry, electronics, electrical appliances, textiles, appliances and building materials. However, the maximum heat distortion temperature of ABS resin cannot exceed 100°C, which limits the application range of ABS resin. [0003...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F2/38C08L35/06C08F222/08C08L55/02
Inventor 孙锦伟刘志超刘毓红孔诚郑宝钱
Owner 江苏科利新材料有限公司
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