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Completely biodegradable polylactic acid composition and its preparation method

A biodegradable polylactic acid technology, applied in the field of polymer materials, can solve the problems of limited compatibilization effect and low reactivity of epoxy compatibilizers, etc., and achieve good toughness

Inactive Publication Date: 2012-06-27
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the PLA / PBAT blend system, it has been reported in the literature that epoxy compatibilizers are used for compatibilization, such as Lotader AX8900 from Arkema, France (Research on AX8900 compatibilized polylactic acid / PBAT blend system, Plastic Industry, 2009 , 3:75-77), however, the processing temperature of PLA / PBAT is generally 180 ° C, the reactivity of the epoxy compatibilizer is not high at this temperature, and its compatibilizing effect is limited

Method used

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  • Completely biodegradable polylactic acid composition and its preparation method
  • Completely biodegradable polylactic acid composition and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Polylactic acid (manufactured by Natural Works, brand 2002D) and terephthalic acid-adipic acid-1,4-butanediol ternary copolyester (manufactured by Zhejiang Hangzhou Xinfu Pharmaceutical Co., Ltd., Biocosafe resin) and 2,2′- Bis-(2-oxazoline) (Wuhan Yuancheng Gongchuang Technology Co., Ltd.) mixed ingredients, its specific composition is: 70 parts of polylactic acid, terephthalic acid-adipic acid-1,4-butanediol ternary 30 parts of copolyester, 0.1 part of 2,2'-bis-(2-oxazoline). The CTE35 twin-screw extruder of Coperion Keyer Nanjing Machinery Co., Ltd. was used for blending and granulation. The temperatures of each section of the extruder were: 160°C, 170°C, 175°C, 175°C, 175°C and 170°C (head temperature). The pellets were made into standard specimens by injection method, and the tensile properties were tested. The results are shown in Table 1.

Embodiment 2

[0021] Except that 2,2'-bis-(2-oxazoline) in Example 1 was changed to 0.5 part, other conditions were the same as in Example 2. The pellets obtained by melt blending were made into standard specimens by injection method, and the tensile properties were tested. The results are listed in Table 1.

Embodiment 3

[0023] Except that 2,2'-bis-(2-oxazoline) in Example 1 was changed to 1 part, other conditions were the same as in Example 2. The pellets obtained by melt blending were made into standard specimens by injection method, and the tensile properties were tested. The results are listed in Table 1.

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Abstract

The invention provides a completely biodegradable polylactic acid composition and its preparation method. According to the method of the invention, polylactic acid (PLA), terephthalic acid-adipic acid-1, 4-butanediol terpolyester (PBAT), and bisoxazoline are fused and blended according to certain proportion, thus obtaining the completely biodegradable polylactic acid composition. The polylactic acid composition prepared in the invention has excellent toughness, strength, biodegradability, as well as good product stability, and can be used for fibers and packaging materials. The preparation method is simple and is easy for production.

Description

Technical field [0001] A completely biodegradable polylactic acid composition and its preparation method belong to the technical field of polymer materials. Background technique [0002] Polylactic acid (PLA) is a biodegradable polymer material that can be completely decomposed into water and carbon dioxide under the action of microorganisms in nature. PLA is a thermoplastic polymer that can be processed by common methods, such as extrusion, molding, cast molding, melt spinning, solution spinning, blow molding, etc., and is widely used in medical and health, clothing, home decoration, industry, etc. field. However, polylactic acid has poor toughness, lacks elasticity and flexibility, and these shortcomings limit its application. [0003] Terephthalic acid-adipic acid-1,4-butanediol terpolyester (PBAT) is also a fully biodegradable polymer material. PBAT has good tensile properties and flexibility. PBAT can be used to Toughening of PLA is also an effective toughening metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08K5/353
Inventor 东为富陈明清邹本书倪忠斌朱卫平沈海亮
Owner JIANGNAN UNIV