Long chain branch polylactic acid preparation method

A polylactic acid and long-branched technology is applied in the preparation field of the chemical technology field, and can solve the problems of difficult processing and forming process, low melt strength, etc., and achieve the effects of low cost, high melt strength, and high modulus.

Inactive Publication Date: 2009-12-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The purpose of the present invention is to solve the low melt strength of polylactic acid materials, resulting in difficult problems such as foaming, film blowing and other processing and molding processes. The molecular weight, modulus and melt strength of the long branched polylactic acid obtained by the present invention have been improved. Can be used in molding processes such as foaming and blown film

Method used

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  • Long chain branch polylactic acid preparation method
  • Long chain branch polylactic acid preparation method
  • Long chain branch polylactic acid preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of Long Branched Polylactic Acid

[0022] Add 100 parts of polylactic acid raw materials to the Haake internal mixer at 190°C until completely melted, then add 0.5 parts of 1,3,5-trimethyl-2,4,6-(3,5-di-tert-butyl -4-Hydroxybenzyl) benzene, after mixing evenly, add 0.04 part of triglycidyl isocyanurate immediately, react blending 20min, internal mixer speed is 60rpm, obtain a kind of long branched polylactic acid material. The antioxidant can prevent thermal oxidation degradation of polylactic acid during processing. Table 1 shows the melt index results of the obtained reaction product material measured according to the ASTM D1238 standard.

[0023] figure 1 It is the extensional rheological curve of the long-branched polylactic acid material obtained in Example 1 compared with the pure linear polylactic acid. It can be seen that the linear polylactic acid has no strain hardening phenomenon at different tensile rates, but after melting for a long time Aft...

Embodiment 2

[0027] Preparation of Long Branched Polylactic Acid

[0028] Add 100 parts of polylactic acid raw materials to the Haake mixer at 200°C until completely melted, then add 0.5 parts of 1,3,5-trimethyl-2,4,6-(3,5-di-tert-butyl -4-Hydroxybenzyl)benzene, after mixing evenly, add 0.03 part of triglycidyl isocyanurate immediately, react and blend for 10min, the speed of internal mixer is 40rpm, obtain a kind of long branched polylactic acid material. The test results are shown in Table 1.

Embodiment 3

[0030] Preparation of Long Branched Polylactic Acid

[0031] Add 100 parts of polylactic acid raw materials to the Haake internal mixer at 210°C until completely melted, then add 0.5 parts of 1,3,5-trimethyl-2,4,6-(3,5-di-tert-butyl -4-Hydroxybenzyl)benzene, after mixing evenly, add 0.06 part of triglycidyl isocyanurate immediately, react and blend for 30min, the speed of internal mixer is 80rpm, obtain a kind of long branched polylactic acid material. The test results are shown in Table 1.

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Abstract

A long chain branch polylactic acid preparation method comprises the following steps: firstly, melting 100 parts of linear polylactic acid by weight at 190-210 DEG C, adding 0.5-1 part of antioxygen by weight, then adding 0.03-0.06 part of polyfunctional monomer by weight, and mixing the mixture for 10-30min to obtain the long chain branch polylactic acid; wherein, the polyfunctional monomer is one or more epoxy monomers with 3 or more of functionality. The molecular weight, the modulus and the melt strength of the product prepared by the invention are improved and the product can be used in forming processes such as foaming, film blowing and the like.

Description

technical field [0001] The invention relates to a preparation method in the technical field of chemical industry, in particular to a preparation method of long branched polylactic acid. Background technique [0002] With the intensification of the oil crisis and the urgency of environmental governance issues, polylactic acid, as a substitute for traditional plastics, has the outstanding advantages of the material itself: it comes from renewable resources, which can alleviate the dependence of the source of polymer materials on petroleum refining Polylactic acid can be completely degraded under certain conditions, avoiding the generation of "white pollution" from the source, and realizing the natural circulation of materials in a real sense; in addition, the mechanical and physical properties of polylactic acid are relatively comparable among polyesters. It is better to say that it also has the advantages of high gloss and transparency, and is non-toxic to the human body. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91C08G63/06C08G63/685
Inventor 娄立娟刘建叶俞炜周持兴
Owner SHANGHAI JIAO TONG UNIV
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