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High-toughness polylactic acid resin and preparation method thereof

A technology of polylactic acid resin and high toughness, applied in the field of high toughness polylactic acid resin and its preparation, can solve problems such as limited impact strength, achieve the effects of improving processing performance, mature technology, and improving rheological behavior

Inactive Publication Date: 2010-11-03
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above research mainly focuses on improving the elongation at break, and the improvement of impact strength is very limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: a kind of high-toughness polylactic acid resin, the composition of its formula and the proportion of parts by mass are:

[0021] The number-average molecular weight of polylactic acid is 80,000, 100 parts;

[0022] Toughening agent methyl methacrylate-butadiene-styrene copolymer 20 parts; the mass percentage content of methyl methacrylate in the copolymer is: 17%, the percentage content of butadiene is: 68%, benzene Ethylene percentage content: 15%;

[0023] Plasticizer acetyl tri-n-butyl citrate 8 parts;

[0024] Antioxidant 0.5 part;

[0025] Described antioxidant is tetrakis (β-(3,5-di-tert-butyl-4-hydroxy) propionic acid) pentaerythritol ester and tris (2,4-di-tert-butyl phosphite) with mass ratio of 1:2. phenyl) esters.

[0026]The preparation method of high-toughness polylactic acid resin is as follows. According to the above-mentioned proportion, the dried polylactic acid, toughening agent, plasticizer and antioxidant are mechanically blended, a...

Embodiment 2

[0027] Embodiment 2: take each component by following formula and weight:

[0028] The number-average molecular weight of polylactic acid is 80,000, 100 parts;

[0029] Toughening agent methyl methacrylate-butadiene-styrene copolymer, the content of methyl methacrylate in the composition is: 17%, the content of butadiene: 68%, and the content of styrene: 15%; 35 parts;

[0030] Plasticizer acetyl tri-n-butyl citrate 2 parts;

[0031] Antioxidant 0.3 parts;

[0032] Described antioxidant is tetrakis (beta-(3,5-di-tert-butyl-4-hydroxy) propionic acid) pentaerythritol ester and tris(2,4-di-tert-butyl phosphite) that mass ratio is 1:2 a mixture of phenyl) esters;

[0033] The steps and conditions of the preparation method of the high-toughness polylactic acid resin are the same as those in Example 1. The mechanical properties of the obtained high-toughness polylactic acid resin are as follows: the tensile strength is 34.6MPa, the elongation at break is 324%, and the notched im...

Embodiment 3

[0034] Embodiment 3: take each component by following formula and weight:

[0035] The number-average molecular weight of polylactic acid is 200,000, 100 copies;

[0036] Toughening agent methyl methacrylate-butadiene-styrene copolymer, the content of methyl methacrylate in the composition is: 13%, the content of butadiene: 72%, and the content of styrene: 15%; 20 parts;

[0037] 7 parts of plasticizer acetyl tri-n-butyl citrate;

[0038] Antioxidant 0.3 parts;

[0039] Described is that the mass ratio of 1:2 is four (β-(3,5-di-tert-butyl-4-hydroxy) propionic acid) pentaerythritol ester and tris(2,4-di-tert-butylphenyl phosphite) ) mixtures of esters;

[0040] The steps and conditions of the preparation method of the high-toughness polylactic acid resin are the same as those in Example 1. The mechanical properties of the obtained high-toughness polylactic acid resin are as follows: the tensile strength is 41.3MPa, the elongation at break is 216%, and the notched impact str...

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Abstract

The invention provides a high-toughness polylactic acid resin and a preparation method thereof. The high-toughness polylactic acid resin is prepared from polylactic acid, methyl methacrylate-butadiene-styrol copolymer as toughener, citrate plasticizer and a mixture of pentaerythrite tetra[beta-(3,5-di-tert-butyl-4-hydroxy)propionate) and tris(2,4-di-tert-butylphenyl)phosphite as antioxidant. The preparation method comprises the following steps: mechanically mixing the polylactic acid, the toughener, the plasticizer and the antioxidant, and melting and processing by using a double screw extruder. The invention has the advantages of simple process and easy acquisition of materials, and obviously overcomes serious defects of the toughness and brittleness of polylactic acid. Compared with the material prepared on the basis of pure polylactic acid, the breaking elongation of the material of the invention is increased form 5.7% to 315%, and the impact strength is increased from 4.7KJ / m<2> to 104.2KJ / m<2>. The prepared high-toughness polylactic acid resin can be used for preparing films, plates, sheets and foam and injection molding parts and used in automobiles, writing materials, toys, household appliances and the like.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a high-toughness polylactic acid resin and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a kind of raw material from grain starch, which is obtained by biological fermentation to obtain lactic acid, and then polymerized to obtain polylactic acid resin. It has two major advantages: First, it is biodegradable, and it is easily decomposed into carbon dioxide and water in the soil, which can be absorbed by plants and recycled. Second, it is a non-petroleum-based plastic derived from renewable resources such as plants. Under the situation of increasingly tense petroleum energy, the development and research of polylactic acid resin is particularly important. The properties of PLA itself are similar to general-purpose plastic polypropylene, such as high modulus, high tensile strength and good processability. However, the brittleness of polylactic a...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L51/04C08K5/11C08K5/134C08K5/526B29C47/92B29C48/92
CPCB29C48/92B29C48/875B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895B29C2948/92904
Inventor 张会良刘南安冉祥海韩常玉边俊甲庄宇刚董丽松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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