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A kind of production method of polylactic acid class material

A technology of polylactic acid and copolymer, which is applied in the field of production of biodegradable materials, can solve the problems of high energy consumption and long polymerization process, and achieve the effects of low energy consumption, simple process equipment and improved product quality

Active Publication Date: 2016-01-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymerization process used in this patent is relatively long and consumes a lot of energy

Method used

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  • A kind of production method of polylactic acid class material
  • A kind of production method of polylactic acid class material
  • A kind of production method of polylactic acid class material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 200kg of L-lactide to a 500L melting tank purged with nitrogen and at a temperature of 110°C. After the L-lactide is completely melted, it is continuously supplied to a 20L prepolymerization tank at a mass flow rate of 5kg / h by a metering pump. At the same time, the catalyst stannous octoate was continuously supplied to a 20L prepolymerization tank at a mass flow rate of 1.5g / h through a syringe pump, and prepolymerized at a temperature of 150°C and a pressure of 0.4MPa for 2.0 hours. The conversion rate of lactide reaches 50%.

[0041] The obtained prepolymer was sent to the tubular reactor with a gear pump, operated adiabatically and the residence time was 2.0 hours, the conversion rate of lactide was finally 96.6%, and the temperature of the melt rose to 185°C. The weight average molecular weight of the obtained polylactic acid material was 145,000. As shown in Table 1.

Embodiment 2

[0043] Add 200kg of DL-lactide to a 500L melting tank purged with nitrogen and at a temperature of 130°C. After the DL-lactide is completely melted, it is continuously supplied to a 20L prepolymerization tank at a mass flow rate of 5kg / h by a metering pump At the same time, the catalyst stannous octoate was continuously supplied to a 20L prepolymerization tank at a mass flow rate of 1.5g / h through a syringe pump, and prepolymerized at a temperature of 150°C and a pressure of 0.4MPa for 2.0 hours. The lactide conversion rate reached 45%.

[0044] The obtained prepolymer was sent to the tubular reactor with a gear pump, operated adiabatically and the residence time was 2.0 hours, the conversion rate of lactide was finally 96.4%, and the temperature of the melt rose to 188°C. The weight average molecular weight of the obtained polylactic acid material was 155,000. As shown in Table 1.

Embodiment 3

[0046] Add 200kg of L-lactide to a 500L melting tank purged with nitrogen and at a temperature of 110°C. After the L-lactide is completely melted, 20L of pre-polymerized At the same time, the catalyst stannous octoate was continuously supplied to a 20L prepolymerization kettle at a mass flow rate of 1.0 g / h through a syringe pump, and the prepolymerization was carried out at a temperature of 140° C. and a pressure of 0.4 MPa for 2.5 hours. The conversion rate of lactide reaches 40%.

[0047] The obtained prepolymer was sent to the tubular reactor with a gear pump, operated adiabatically and the residence time was 3.0 hours, the conversion rate of lactide was finally 96.3%, and the temperature of the melt rose to 190°C. The weight average molecular weight of the obtained polylactic acid material was 149,000. As shown in Table 1.

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Abstract

The invention discloses a production method of a polylactic acid material. The production method comprises following steps: in the presence of a catalyst, a molten lactide monomer is subjected to pre-polymerization at a temperature of 110 to 150 DEG C, wherein monomer conversion rate ranges from 40 to 50%; and a prepolymer obtained via step is subjected to further polymerization under adiabatic conditions so as to obtain the polylactic acid material, wherein monomer conversion rate is more than 95%. According to the production method and equipment disclosed in the invention, the processing equipment is simple; for production of the polylactic acid material, technical processes are simple, energy consumption is low, and cost is low; continuous production can be realized; the production method is convenient for large-scaled stable production; and application prospect is promising.

Description

technical field [0001] The present invention relates to a method for producing biodegradable materials, more specifically, a method for producing polylactic acid materials. Background technique [0002] In recent years, plastic products such as polyethylene, polypropylene, polystyrene and polyvinyl chloride have been widely used, and the disposal of waste after use has become one of the increasingly serious environmental problems. These wastes are generally treated by incineration or landfill. Incineration will produce harmful gases. Due to the high chemical stability of the above-mentioned plastics, there is almost no biological or microbial decomposition after burial, and they remain in a semi-permanent state. [0003] In order to solve the above problems, researchers have vigorously developed environmentally friendly biodegradable polymers, one of which is polylactic acid. Polylactic acid can be produced by fermenting starch as a main raw material to produce lactic aci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/08C08G63/78
Inventor 孟伟娟杜影闫岩齐可非刘铭唐伟刚
Owner CHINA PETROLEUM & CHEM CORP