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Polylactic acid and device and method for preparing polylactic acid

A polylactic acid and driving device technology, applied in chemical instruments and methods, chemical/physical/physical chemical processes, chemical/physical/physical chemical fixed reactors, etc., can solve the problem of high lactide content and long reaction cycle , low conversion rate and other problems, to achieve the effect of reducing lactide monomer content, improving color defects, and high devolatilization efficiency

Active Publication Date: 2020-07-28
JILIN COFCO BIOCHEM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to overcome the problems that the polylactic acid prepared in the prior art cannot be industrialized, the reaction cycle is long, and the conversion rate is low; the problem of the high content of lactide remaining in the polylactic acid; and the poor color of the finished polylactic acid In order to solve the defect problem of polylactic acid, a polylactic acid and a device and method for preparing polylactic acid are provided. The residual lactide content in polylactic acid prepared by the device and method is as low as 0.8‰; in addition, the conversion rate of polylactic acid is high, which can realize industrial chemical production

Method used

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  • Polylactic acid and device and method for preparing polylactic acid
  • Polylactic acid and device and method for preparing polylactic acid
  • Polylactic acid and device and method for preparing polylactic acid

Examples

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Effect test

Embodiment 1

[0102] This embodiment is to illustrate the polylactic acid prepared by the device and method of the present invention.

[0103] (1) Lactide melting process: under continuous nitrogen protection, lactide is added to lactide melting tank I, and melted at 95° C. for 1 hour to obtain molten lactide;

[0104] (2) The first polymerization reaction process: the molten lactide is passed into the first polymerization reactor II, and the catalyst stannous octoate, the ring-opening polymerization initiator polyethylene glycol, and the high-efficiency composite stabilizer CS- 12 (composite stabilizer CS-12 is compounded by AT-76 and AT-626 at a mass ratio of 2:1), the first polymerization reaction is carried out at a temperature of 155°C, a pressure of 50kPa, and a reaction time of 3h , the conversion rate reaches 55%.

[0105] (3) The second polymerization reaction process: the first melt after the first polymerization reaction is passed into the second polymerization reactor III, at a...

Embodiment 2

[0109] This embodiment is to illustrate the polylactic acid prepared by the device and method of the present invention.

[0110] (1) Lactide melting process: under continuous nitrogen protection, lactide is added to lactide melting tank I, and melted at 90° C. for 1 hour to obtain molten lactide;

[0111] (2) The first polymerization reaction process: the molten lactide is passed into the first polymerization reactor II, and the catalyst stannous octoate, the ring-opening polymerization initiator polyethylene glycol, and the high-efficiency composite stabilizer CS- 9 (composite stabilizer CS-9 is compounded by AT-10 and AT-168 at a mass ratio of 2:1), the first polymerization reaction is carried out under the conditions of temperature 150°C, pressure 50kPa, and reaction time 3h , the conversion rate reaches 55%;

[0112] (3) The second polymerization reaction process: the first melt after the first polymerization reaction is passed into the second polymerization reactor III, ...

Embodiment 3-12

[0116] Embodiment 3-12 is to illustrate the polylactic acid prepared by the device and method of the present invention.

[0117] Prepare polylactic acid according to the same device and method as in Example 1, except that the composite stabilizer CS1-12 is replaced, and the conditions in step (d) are modified, and the conditions for preparation are shown in Table 1 , and the test results are shown in Table 2.

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Abstract

The invention relates to the technical field of high polymer materials, and discloses polylactic acid and a device and method for preparing polylactic acid. The device comprises a lactide melting tank, a first polymerization reactor, a second polymerization reactor and a monomer removal reactor which are connected in sequence, the monomer removal reactor comprises an electromagnetic vibration exciter, a stirring driving motor and a stirring driving device, the stirring driving motor is connected with the stirring driving device so as to regulate and control the stirring frequency of the stirring shaft, and the electromagnetic vibration exciter is connected with the stirring driving motor through a vibration transmission disc so as to enable the stirring driving motor to vibrate in the axial direction. The content of residual lactide in the polylactic acid prepared by the device is 0.08%, in addition, the conversion rate of polylactic acid is high, and industrial production can be realized.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to polylactic acid and a device and method for preparing polylactic acid. Background technique [0002] Polylactic acid (PLA) has been in a stage of rapid development. Although some enterprises have embarked on the road of industrialization, the process, method and quality of PLA still need to be improved. The problems that affect the quality of polylactic acid resin mainly include two aspects. On the one hand, in the process of polymerization and production of PLA, due to side reactions such as thermal aging and thermal oxygen aging of lactide, the b value in the L, a, and b color values ​​​​of PLA slices If it is too high, the obtained PLA slices are slightly yellow; on the other hand, the lactide monomer content in the polylactic acid resin is high, and these monomers that have not participated in the reaction will change the physical properties of the PLA product throu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/18C08G63/78C08G63/08C08K5/134C08K5/526
CPCB01J19/0053B01J19/18B01J19/185B01J19/1862C08G63/08C08G63/78C08G63/785C08K5/1345C08K5/526
Inventor 佟毅李义刘志刚郇月伟许克家崔兆宁
Owner JILIN COFCO BIOCHEM
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