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Polylactic acid material with high melt strength and preparation method thereof

A high-melt-strength, polylactic acid material technology, applied in the field of fully biodegradable polymer materials, can solve the problems of restricting the large-scale production of polylactic acid materials, harsh production conditions, complicated processing processes, etc., and achieves high production efficiency and improved melting point. Body strength, simple process effect

Active Publication Date: 2019-07-23
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of ray irradiation grafting does have its advantages, and the obtained grafted polylactic acid can significantly improve the melt strength, but the production conditions of the material are relatively harsh and need to be carried out in multiple steps, the treatment process is relatively complicated, and the investment in equipment is large , limiting the large-scale production of polylactic acid materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 493g of polylactic acid, 5g of 1,6-hexanediol diacrylate, 1.5g of dicumyl peroxide, processing aid BHT (hindered phenolic antioxidant 2,8-di-tert-butyl-4-methyl Phenol) 0.5g, acetone 10g, 1,6-hexanediol diacrylate and dicumyl peroxide are fully dissolved in acetone first, then poured into polylactic acid, fully mixed in a mixer, until the acetone volatilizes Completely, the grafted polylactic acid product is obtained through a twin-screw extruder melt grafting reaction. The temperature of the twin-screw extruder is 160~180°C, the screw speed is 50r / min, the melt flow rate of the grafted product is 1.2g / 10min, and the melt strength is 6.8×10 4 Pa·s.

Embodiment 2

[0024] Weigh 488g of polylactic acid, 10g of 1,6-hexanediol diacrylate, 1.5g of dicumyl peroxide, 0.5g of processing aid TH-168 (phosphite antioxidant), 10g of acetone, and mix 1, 6-Hexanediol diacrylate and dicumyl peroxide are fully dissolved in acetone, then poured into polylactic acid, mixed fully in a mixer, until the acetone is completely volatilized, melted and grafted through a twin-screw extruder The reaction results in grafted polylactic acid products. The temperature of the twin-screw extruder is 170~190°C, the screw speed is 60r / min, the melt flow rate of the grafted product is 0.8g / 10min, and the melt strength is 9.3×10 4 Pa·s.

Embodiment 3

[0026] Weigh 483g of polylactic acid, 15g of 1,6-hexanediol diacrylate, 1.5g of dicumyl peroxide, 0.5g of processing aid BHT, and 10g of acetone. After the dicumyl oxide is fully dissolved in acetone, it is poured into polylactic acid, and fully mixed in a mixer. After the acetone is completely volatilized, the grafted polylactic acid product is obtained through a twin-screw extruder melting and grafting reaction. The temperature of the twin-screw extruder is 180~200°C, and the screw speed is 80r / min. The melt flow rate of the obtained grafted product is 0.6g / 10min, and the melt strength is 1.48×10 5 Pa·s, the crystallinity increased by 65% ​​to 38%.

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Abstract

The invention discloses a polylactic acid material with high melt strength and a preparation method thereof. The polylactic acid material comprises the following raw materials in percentage by mass: 95.7%-99.7% of polylactic acid(PLA), 0.1%-5% of hexamethylene diacrylate(HDDA), 0.01%-0. 4% of dicumyl peroxide(DCP) and 0-2% of processing aids, wherein with DCP as an initiator, PLA and HDDA are subjected to a fusion grafting reaction through a twin-screw extruder to obtain the polylactic acid material. The HDDA-g-PLA material has high melt strength and improves the crystallization ability of PLA. The process is very simple and favorable for large-scale production, the grafted polylactic acid material can significantly improve the melt strength, has no gel or crosslinking phenomenon, has highproduction efficiency and stable quality, and can be used for secondary processing.

Description

technical field [0001] The invention relates to a fully biodegradable polymer material, in particular to a gel-free high-melt strength polylactic acid material and a preparation method thereof. [0002] technical background [0003] Polylactic acid (PLA) is a kind of fully biodegradable polymer material obtained by polycondensation of cellulose, starch, polysaccharide and other renewable natural resources as raw materials, which are hydrolyzed and fermented by microorganisms, and then polycondensed. There is no pollution in the environment, and the final products of degradation are water and carbon dioxide, which can realize the material cycle in nature. Polylactic acid has the characteristics of non-toxicity, high transparency, excellent biocompatibility, and strong plasticity. It is widely used in 3D printing, automobiles, medical equipment, and electronics. However, linear polylactic acid has low melt strength, low sag resistance, and poor toughness, so it is not conduciv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/02C08F222/14
CPCC08F283/02C08F222/102
Inventor 戴文利王崇陈宇
Owner XIANGTAN UNIV
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