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Poly (propylene carbonate) (PPC) production process

A polypropylene carbonate and polymerization technology, which is applied in the fields of polymer synthesis and chemical industry, can solve the problems of limited popularization and use, high price of PPC, etc., and achieve the effects of less investment in equipment, wide molecular weight distribution, and simple process

Inactive Publication Date: 2014-08-06
HUNAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high price of PPC, its promotion and use are limited

Method used

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  • Poly (propylene carbonate) (PPC) production process

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Embodiment Construction

[0016] The process flow of the present invention is as follows: put the refined propylene oxide and solvent into the configuration tank 1 with agitator, and pump into the first reaction tower 3 (plate type) through the feed pump 2, and the CO 2 Compressed air is pumped into the reaction tower, CO 2 After contacting with propylene oxide, the PPC long-chain polymer is obtained by reaction. Keep the proper solution viscosity, pump the reaction product into the second reaction tower 4 (plate type), after the reaction, pump into the third reaction tower 5 (bubble reaction tower), after a certain period of reaction, use the reaction product with a discharge pump 7 Pump into the termination tank 6, a small amount of unreacted CO 2 No recycling value, non-toxic, and can be discharged directly. In the termination tank 6, the anionic polymerization reaction of PPC is terminated with a proton-containing terminator to obtain a PPC slurry with a suitable viscosity. The slurry contains PPC, ...

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Abstract

The invention relates to a poly (propylene carbonate) (PPC) production process, belonging to the fields of polymer synthesis and chemical industry. PPC is prepared by alternating copolymerization of CO2 and propylene oxide through negative ions, is a biodegradable environment-friendly product with a high-added value and can be completely degraded into water and CO2. The current production process is mainly used for obtaining PPC with a certain molecular weight in a reaction kettle through bulk polymerization. The process has the problems of relatively low solid content, more unreacted monomers, aftertreatment difficulty, relatively poor synthetic product performance, relatively high cost and the like when the reaction is ended. PPC is synthesized by using a three-stage reaction tower, an ending kettle and a precipitation solution polymerization method. By using the process, PPC with high monomer conversion rate, more stable quality, more optimized performance and lower cost can be obtained.

Description

technical field [0001] The invention relates to a new production process of polypropylene carbonate (PPC), which belongs to the field of polymer synthesis and chemical industry. Background technique [0002] Polypropylene carbonate (PPC) is made of carbon dioxide (CO 2 ) and propylene oxide under the action of a catalyst, mainly through the anion alternating copolymerization reaction, to obtain a polymer material with a certain molecular weight. PPC is a new type of fully biodegradable high value-added environmental protection product that can be completely degraded into water and CO 2 , with good transparency, degradability, high barrier (oxygen barrier), biocompatibility, etc. It can replace many non-degradable products used in the fields of medicine, food and agriculture, and is an environmentally friendly material with great development prospects. [0003] After more than 30 years of research and development, the industrialization of PPC has been improved, but still n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/34C08G64/20
Inventor 石璞刘跃军钟苗苗李福枝刘义武陈浪雷县平刘承唐靖靓
Owner HUNAN UNIV OF TECH
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