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Toughened polylactic acid composition and preparation method thereof

A technology of polylactic acid and its composition, which is applied in the field of toughened polylactic acid composition and its preparation, can solve the problems of reducing the effect of toughening modification, environmental pollution, non-biodegradable, etc., achieve easy implementation of the operation process, and solve the shortage of resources , the effect of solving white pollution

Active Publication Date: 2016-06-15
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the raw materials for the synthesis of micro-nano rubber particles involved in the above-mentioned toughening modification are all derived from non-renewable fossil resources and are not biodegradable. After use, a large amount of waste will be generated, causing a certain degree of pollution to the environment.
[0005] It can be seen that although the traditional polymer toughening agent improves the toughness of polylactic acid to a certain extent, it often has the disadvantage of not being biodegradable. The toughening agent will produce waste after use and cause a certain degree of pollution to the environment; or, Blocky tougheners cannot be well dispersed in the polylactic acid matrix, which reduces the toughening modification effect

Method used

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  • Toughened polylactic acid composition and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]Dry 100 parts (mass parts, the same below) of poly-L-lactic acid, 0.5 part of bio-based vulcanized polyester rubber particles, and 0.015 parts of carbodiimide anti-hydrolysis agent UN-150 in a twin-screw extruder through high temperature The fully biodegradable toughened polylactic acid composition is prepared by melt blending.

[0045] The temperature of each section of the twin-screw extruder is 160-180° C., and the screw speed is 250-300 rpm.

Embodiment 2

[0047] Add 12.56g (0.165mol) 1,3-propanediol, 14.87g (0.165mol) 1,4-butanediol and 4.61g (0.039mol) Succinic acid, 31.55 g (0.156 mol) of sebacic acid, and 12.19 g (0.105 mol) of fumaric acid were heated to 180° C. under nitrogen protection and stirring, and esterified for 1 hour to obtain a polyester prepolymer. Add 75.8 mg of p-toluenesulfonic acid and 151.6 mg of p-benzoquinone to the polyester prepolymer obtained above, heat up to 220 ° C, gradually reduce the pressure in the reaction device from 1 atmospheric pressure to 1500 Pa, and react for 2.5 hours. The obtained bio-based aliphatic unsaturated polyester has a number average molecular weight of 4132, a weight average molecular weight of 7478 and a polydispersity coefficient of 1.81. After cooling down to 150°C, add 3.7890g of pentaerythritol tetra(meth)acrylate and 6.0624g of polyethylene glycol 400 monooleate, stir evenly, and after cooling, a paste-like bio-based aliphatic unsaturated polyester mixture is obtained ...

Embodiment 3

[0056] 100 parts of dry poly-L-lactic acid, 2 parts of bio-based vulcanized polyester rubber particles, 0.06 parts of carbodiimide anti-hydrolysis agent UN-150 are prepared by high-temperature melt blending in a twin-screw extruder. Completely biodegradable toughened polylactic acid composition.

[0057] The temperature of each section of the twin-screw extruder is 160-180° C., and the screw speed is 250-300 rpm.

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Abstract

The invention relates to the technical field of high polymer materials, in particular to toughened polylactic acid composition and a preparation method thereof. The toughened polylactic acid composition comprises components in parts by mass as follows: 100 parts of polylactic acid, 0.5-20 parts of bio-based vulcanized lactoprene rubber particles and 0-0.6 parts of a hydrolysis-resistant agent. The biologically degradable bio-base vulcanized lactoprene rubber particles are used for toughening polylactic acid, the toughness of polylactic acid is remarkably improved, the polylactic acid can be completely biologically degraded, and the prepared toughened polylactic acid composition capable of being completely biologically degraded has higher elongation at break and notch impact strength.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a fully biodegradable toughened polylactic acid composition and a preparation method thereof. Background technique [0002] Polylactic acid is a new type of polyester biomaterial made from plant starch through fermentation and polycondensation. It is non-toxic, non-irritating, and has good biocompatibility. It can be biodegraded and absorbed without polluting the environment, etc. However, polylactic acid also has disadvantages such as low elongation at break and poor toughness, which limit its application. In order to give full play to the performance advantages of polylactic acid, it must be toughened and modified. Among them, the patent CN1367189A applied by Chongqing University uses the method of free radical grafting to graft polyvinyl alcohol, acrylic acid, etc. to the main chain of polylactic acid to toughen and modify polylactic acid, which obviously improves t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/06C08K5/29C08J3/28C08J3/24C08J3/03C08G63/52
CPCC08G63/52C08J3/03C08J3/24C08J3/28C08L67/04C08L67/06C08L2201/06C08J2367/06C08K5/29
Inventor 王庆国崔泉德邱立言李贵亮
Owner QINGDAO UNIV OF SCI & TECH
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