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Transparent and toughening polylactic acid resin and method for preparing the same

A polylactic acid resin and polylactic acid technology, which is applied in the field of polymer materials, can solve the problems of improving the impact strength of polylactic acid resin, the brittleness of polylactic acid resin affecting the wide application of polylactic acid, etc., and achieves great economic and social significance. The effect of declining, promising market prospects

Inactive Publication Date: 2011-03-09
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

[0012] The above studies on the transparent modification of polylactic acid both at home and abroad, although the transparency of polylactic acid resin can be maintained, have not studied the method of improving the impact strength of polylactic acid resin, and the brittleness of polylactic acid resin is serious. It affects the wide application of polylactic acid main problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: The present invention provides a kind of transparent and toughened polylactic acid resin, and the composition of its formula and the proportioning of mass parts are:

[0023] The number average molecular weight of polylactic acid is 80,000 100 parts;

[0024] 18 parts of toughening agent;

[0025] For the toughening agent methyl methacrylate-butyl acrylate copolymer, the mass percentage content of methyl methacrylate in the copolymer composition is 17%, and the mass percentage content of butyl acrylate is 83%;

[0026] 8 parts of plasticizer acetyl tri-n-butyl citrate;

[0027] The antioxidant is tetrakis(β-(3,5-di-tert-butyl-4-hydroxy) propionate) pentaerythritol ester and tris(2,4-di-tert-butylphenyl phosphite) with a mass ratio of 1:2 ) ester mixture 0.5 parts.

[0028] Weigh each component according to the above formula, mechanically blend each component for 5 minutes, then add the mixed material into a twin-screw extruder to melt, extrude and granu...

Embodiment 2

[0030] Embodiment 2: The present invention provides a kind of transparent and toughened polylactic acid resin, and the composition of its formula and the proportioning of mass parts are:

[0031] The number average molecular weight of polylactic acid is 80,000 100 parts;

[0032] 22 parts of toughening agent;

[0033] For the toughening agent methyl methacrylate-butyl acrylate copolymer, the mass percentage content of methyl methacrylate in the copolymer is 17%, and the mass percentage content of butyl acrylate is 83%;

[0034] 5 parts of plasticizer acetyl tri-n-butyl citrate;

[0035] The antioxidant is tetrakis(β-(3,5-di-tert-butyl-4-hydroxy) propionate) pentaerythritol ester and tris(2,4-di-tert-butylphenyl phosphite) with a mass ratio of 1:2 ) ester mixture 0.3 parts.

[0036]Weigh each component according to the above formula, mechanically blend each component for 5 minutes, then add the mixed material into a twin-screw extruder to melt, extrude and granulate to obtai...

Embodiment 3

[0037] Embodiment 3: each component is taken by following formula and quality:

[0038] The number average molecular weight of polylactic acid is 200,000 100 parts;

[0039] 18 parts of toughening agent;

[0040] For the toughening agent methyl methacrylate-butyl acrylate copolymer, the mass percentage content of methyl methacrylate in the copolymer is 15%, and the mass percentage content of butyl acrylate is 85%;

[0041] 8 parts of plasticizer acetyl tri-n-butyl citrate;

[0042] The antioxidant is tetrakis(β-(3,5-di-tert-butyl-4-hydroxy) propionate) pentaerythritol ester and tris(2,4-di-tert-butylphenyl phosphite) with a mass ratio of 1:2 ) ester mixture 0.3 parts.

[0043] Weigh each component according to the above formula, mechanically blend each component for 5 minutes, then add the mixed material into a twin-screw extruder to melt, extrude and granulate to obtain a transparent and toughened polylactic acid resin; The conditions for extrusion granulation are: the se...

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Abstract

The invention provides a transparent and toughening polylactic acid resin and method for preparing the same. The polylactic acid resin consists of polylactic acid, methyl methacrylate-butyl acrylate copolymer as the flexibilizer, citrate plasticizer, pentaerythritol toltetranitrate (Benzenepropanoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-) as the antioxidant and tris (2,4-ditert-butylphenyl) phosphate. First, premix is prepared by mixing polylactic acid, flexibilizer, plasticizer and antioxidant mechanically. Then the premix is subject to melt extrusion and granulation by utilizing double-screw extruder. The above method has the advantages of increasing the anti-impact strength, tensile strength and elongation at break of polylactic acid and maintaining the transparency thereof. In addition, the viscosity of the blends is decreased, thereby remedying the defects of brittleness of polylactic acid and improving the rheological behavior of materials obviously. The impact strength is up to 60.1KJ / M2.The light transmittance and the haze of the products are 89% and 8.5% respectively when the thickness thereof is 0.04mm.The above polylactic acid resin, instead of PE and PVC, is applicable to the preparation of films, plates, sheet materials, foamings and injection moulding plastics.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a transparent and toughened polylactic acid resin and a preparation method thereof. Background technique [0002] Unlike conventional petroleum-based plastics, polylactic acid is polymerized from lactic acid obtained by fermenting plant starch, which is a renewable resource. In the situation of increasingly tense oil energy, the development and research of polylactic acid resin is particularly important. The properties of polylactic acid itself are similar to the general-purpose plastic polypropylene, such as high modulus, high tensile strength and good processability. However, the brittleness of polylactic acid is serious, and the impact strength is less than 5KJ / m 2 , seriously restricting its wide application. [0003] Polylactic acid also has good processing performance and transparency, and can be applied to traditional extrusion, injection molding, blow molding and other p...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L33/08C08K5/11C08K5/134C08K5/526B29C47/92B29C48/92
CPCB29C48/04
Inventor 张会良刘南安冉祥海韩常玉边俊甲方建勇庄宇刚董丽松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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