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Method of preparing syndiotectic polystyrene

A polystyrene and styrene technology, applied in the field of syndiotactic polystyrene preparation, can solve the problems of low styrene conversion rate and high energy consumption, and achieve the effects of slowing down the polymerization reaction rate, reducing power consumption, and preventing the kettle from sticking

Inactive Publication Date: 2005-03-09
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that there are problems in the existing literature that granulation needs to be achieved through a reactor with a special structure or strong shear and high energy consumption, and the conversion rate of styrene is low. A new method for preparing syndiotactic polymerization is provided. Styrene method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] On a 10-liter mechanically stirred tank, first bake at 90°C for 8 hours, then cool down to 60°C, N 2 After pumping and draining 3 times, 1500 ml of styrene monomer and 1500 ml of hexane were added. After stirring for 30 minutes, inject the toluene solution containing 29.25 mmoles of triisobutylaluminum, 48.75 mmoles of MAO, 0.195 mmoles of the titanocene catalyst of Example 1 with a syringe, and stir and react after 4 hours at 300 rpm, wherein The maximum stirring power is 1.9 kilowatts, stop the reaction with ethanol-hydrochloric acid solution, wash, and dry to obtain 1050 grams of powder solids, 50 grams of granular materials larger than 0.8 mm, styrene conversion rate 81.5%, syndiotacticity 97%, initial crystallinity 40% , molecular weight distribution 1.9.

Embodiment 2

[0016] On a 10-liter mechanically stirred tank, first bake at 90°C for 8 hours, then cool down to 60°C, N 2 After pumping and draining 3 times, 1000 ml of styrene monomer and 2000 ml of hexane were added. After stirring for 30 minutes, inject the toluene solution containing 29.25 mmoles of triisobutylaluminum, 48.75 mmoles of MAO, 0.195 mmoles of the titanocene catalyst of Example 1 with a syringe, and stir and react after 4 hours at 300 rpm, wherein The maximum stirring power is 1.4 kilowatts, stop the reaction with ethanol-hydrochloric acid solution, wash, and dry to obtain 730 grams of powder solids, 10 grams of granular materials larger than 0.8 mm, styrene conversion rate 82.2%, syndiotacticity 97%, initial crystallinity 41% , molecular weight distribution 1.9.

Embodiment 3

[0018] On a 10-liter mechanically stirred tank, first bake at 90°C for 8 hours, then cool down to 60°C, N 2 Evacuated 3 times, added 750 ml of styrene monomer and 2250 ml of hexane. After stirring for 30 minutes, inject the toluene solution containing 29.25 mmoles of triisobutylaluminum, 48.75 mmoles of MAO, 0.195 mmoles of the titanocene catalyst of Example 1 with a syringe, and stir and react after 4 hours at 300 rpm, wherein The maximum stirring power is 1.2 kilowatts, stop the reaction with ethanol-hydrochloric acid solution, wash, and dry to obtain 540 grams of powder solids, 5 grams of granular matter greater than 0.8 mm, styrene conversion rate of 80.7%, syndiotacticity of 97%, and initial crystallinity of 43%. , molecular weight distribution 1.9.

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PUM

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Abstract

A process for preparing the syndiotactic polystyrene from stylene features that the metallocene compound, triisobutyl aluminium and alkyl aluminium are used as catalyst, the inertial solvent is used as medium and reaction temp is 10-100 deg.C.

Description

technical field [0001] The present invention relates to a process for the preparation of syndiotactic polystyrene. Background technique [0002] Syndiotactic polystyrene (sPS) is a new type of semi-crystalline thermoplastic engineering plastics. Its high melting point (270 ° C) and crystallinity endow sPS with excellent heat resistance, water resistance, chemical resistance, electrical insulation and dimensional stability. . Syndiotactic polystyrene can be processed by existing engineering plastic molding equipment for extrusion, injection molding, etc. Since its inception, syndiotactic polystyrene has been a hot topic at home and abroad. [0003] Most of the patents use a homogeneous catalytic system to prepare syndiotactic polystyrene. No matter what kind of catalytic system is used, the syndiotactic polymerization of styrene is a special precipitation polymerization because it is accompanied by the crystallization process of the polymer, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/642C08F112/08
Inventor 沈志刚李伯耿周文乐余波赵薇薇
Owner CHINA PETROLEUM & CHEM CORP
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