Preparation method of easily-processed easily-crystallized polylactic acid

A crystalline polylactic acid and easy-to-process technology, which is applied in the preparation field of the chemical industry, can solve the problems of difficulty in the processing and molding process, low melt strength, etc., and achieve the effects of high crystallization performance, high melt strength, and high modulus.

Active Publication Date: 2013-11-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using one-time melting reaction processing to solve the problem of low melt strength of polylactic acid materials, which leads to difficulties in foaming, film blowing and other processing and molding processes, while improving the crystallization properties of polylactic acid, increasing the molecular weight, modulus and melt strength of polylactic acid, Accelerate the crystallization speed and be used in molding processes such as foaming and blown film

Method used

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  • Preparation method of easily-processed easily-crystallized polylactic acid
  • Preparation method of easily-processed easily-crystallized polylactic acid
  • Preparation method of easily-processed easily-crystallized polylactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 100 parts of linear polylactic acid to an internal mixer at 190°C until it melts completely, then add 0.2 parts of 1,3,5-trimethyl-2,4,6-(3,5-di-tert-butyl -4-hydroxybenzyl)benzene, 5 parts of nano-silica functionalized with 2,4-toluene diisocyanate, 0.3 part of antimony trioxide catalyst, react and mix for 10min, the speed of internal mixer is 60rpm; then add 0.3 parts of triglycidyl isocyanurate were mixed until the reaction was terminated to obtain a polylactic acid with high crystallinity and high melt strength. Table 1 shows the melt index results of the obtained reaction product material measured according to the ASTM D1238 standard. The obtained reaction product material was subjected to isothermal crystallization half-crystallization time test, and the results are shown in Table 2.

[0024] The test conditions for isothermal crystallization half-crystallization time are as follows: The test is carried out on a differential scanning calorimeter under nitroge...

Embodiment 2

[0027]Add 100 parts of linear polylactic acid to an internal mixer at 210°C until it melts completely, then add 0.5 parts of 1,3,5-trimethyl-2,4,6-(3,5-di-tert-butyl -4-Hydroxybenzyl)benzene, 2 parts of nano-silica functionalized with 2,4-toluene diisocyanate, 0.1 part of antimony trioxide catalyst, mixed for 5 minutes, and the speed of internal mixer was 40rpm; then added 0.2 parts of triglycidyl isocyanurate, mixed until the reaction stops, to obtain a polylactic acid with high crystallinity and high melt strength. The test results are shown in Table 1 and Table 2.

Embodiment 3

[0029] Add 100 parts of linear polylactic acid to an internal mixer at 220°C until it melts completely, then add 0.2 parts of 1,3,5-trimethyl-2,4,6-(3,5-di-tert-butyl -4-hydroxybenzyl)benzene, 9 parts of nano-silica functionalized with 2,4-toluene diisocyanate, 0.5 part of antimony trioxide catalyst, mixed for 15 minutes, and the speed of internal mixer was 80rpm; then added 0.5 parts of triglycidyl isocyanurate, mixed until the reaction stops, to obtain a polylactic acid with high crystallinity and high melt strength. The test results are shown in Table 1 and Table 2.

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Abstract

The invention relates to a preparation method of easily-processed easily-crystallized polylactic acid by melting processing. The preparation method comprises: melting 100 parts by weight of linear polylactic acid at 190-220 DEG C, then successively adding 0.1-0.5 part by weight of an anti-oxidant, 2-10 parts by weight of functionalized nanometer silica and 0.1-0.5 part by weight of a catalyst, mixing for 5-15 min, then adding 0.1-0.5 part by weight of an epoxy polyfunctional monomer and mixing until the reaction is finished, to prepare the high-melt-strength easily-processed easily-crystallized polylactic acid. The functional nanometer silica is nanometer silica modified by an isocyanate polyfunctional monomer, and the epoxy polyfunctional monomer is one or a mixture of multiple epoxy monomers each with functionality being 3 or more. The prepared long-chain branch polylactic acid not only substantially improved in molecular weight, modulus and melt-strength, but also has a substantial accelerated crystallization speed, and is applicable to moulding processes such as foaming, film blowing and the like.

Description

technical field [0001] The invention relates to a preparation method in the field of chemical industry, in particular to a method for preparing polylactic acid that is easy to process and easy to crystallize by using functionalized nano silicon dioxide through melt processing reaction. Background technique [0002] Polymer materials have now become a necessity in people's daily life, and are widely used in various industries. Among them, bulk, high-yield, traditional, and general-purpose polyolefins are the majority, accounting for the total output and More than 80% of the usage. However, the sources of such high molecular polymers are all dependent on petroleum resources, and after use, the post-processing and whereabouts of materials also pose new challenges to people. As an important degradable bio-polyester polymer, polylactic acid material is derived from renewable resources, and its easy-to-degrade characteristics under certain conditions make it get rid of the depend...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K9/04C08K3/36
Inventor 娄立娟黄强吴林美王艳芳姜凯张凤波陈商涛黄伟欢卢晓英
Owner PETROCHINA CO LTD
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