Radiation grafting long-chain branch polylactic acid and preparation method thereof

A branched-chain polylactic acid and radiation-grafting technology are applied in the field of radiation-grafted long-chain branched polylactic acid and its preparation, which can solve the problems of unfavorable final product purity, lack of use value, and lack of strength of PLA, and the preparation method is achieved. Simple and easy to implement, broaden the molecular weight distribution, and improve the effect of melt strength

Inactive Publication Date: 2015-03-25
BEIJING RADIATION APPL RES CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is to produce products under high temperature and long-term conditions. Polylactic acid is easy to degrade under high temperature and long-term conditions. The added antioxidant will introduce new groups to polylactic acid, which is not conducive to ensuring the purity of the final product.
And the method that Chinese patent CN101735409A proposes is only applicable to the radiation mo

Method used

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  • Radiation grafting long-chain branch polylactic acid and preparation method thereof
  • Radiation grafting long-chain branch polylactic acid and preparation method thereof
  • Radiation grafting long-chain branch polylactic acid and preparation method thereof

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preparation example Construction

[0020] Its preparation method comprises the following steps:

[0021] (1) PLA was air-dried at 50°C for 24 hours;

[0022] (2) PLA after dry treatment is added in the feeder of twin-screw extruder;

[0023] (3) Add HDDA into the container of the constant pressure and steady flow liquid supply pump system;

[0024] (4) The temperature of each zone of the twin-screw extruder is: zone 1 160°C, zone 2 175°C, zone 3 to zone 8 185°C, zone 9 170°C, zone 10 160°C.

[0025] (5) According to the ratio of HDDA to PLA mass ratio of 1:99, set the speed of the feeder to 18rads / min, and the flow rate of the constant pressure and steady flow liquid supply pump to 1.3ml / min.

[0026] (6) After the temperature in each area of ​​the twin-screw extruder is stable for 30 minutes, turn on the twin-screw at a speed of 85rads / min, and simultaneously turn on the feeder and the constant-pressure and steady-flow liquid supply pump. The twin-screw extruder displays a torque of 17-20Nm, and the outlet ...

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Abstract

The invention discloses a radiation grafting long-chain branch polylactic acid which comprises a polylactic acid and 1,6-hexanediol diacrylate. The preparation method comprises the following steps: performing air blast drying on the polylactic acid, adding 1,6-hexanediol diacrylate in a molten PLA (Polylactic Acid) in a twin-screw extruder, extruding, air cooling, granulating, and performing the processing steps such as Co60 radiation irradiation under the oxygen limiting condition to obtain the long-chain branch polylactic acid. The production process is simple, the time for extruding and granulating is relatively short, the irradiation dose can be controlled, and the prepared long-chain branch polylactic acid is wide in molecular weight distribution, has relatively high storage moduli and relatively low loss angles, improves the strength of a melt made of a polylactic acid material, and is an environmental-friendly high-polymer material applied widely.

Description

Technical field [0001] The invention relates to the fields of biodegradable polymer materials and radiation processing, in particular to a radiation-grafted long-chain branched polylactic acid and a preparation method thereof. Background technique [0002] Polylactic acid (PLA), referred to as PLA, is a new generation of fully degradable polymer materials developed rapidly in the 1990s. It is made of L-lactic acid, a product of microbial fermentation, and polymerized by chemical synthesis. It is a kind of thermoplastic aliphatic resin. Polylactic acid has excellent biocompatibility and absorbability, non-toxic, non-irritating, it can be completely decomposed in a short period of time under the action of microorganisms, water, acid, alkali, etc. in nature, and the final product is CO 2 and H 2 O, no pollution to the environment, can be used as an environmentally friendly material to replace traditional polymer materials, and has received extensive attention and in-depth res...

Claims

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Application Information

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IPC IPC(8): C08F283/02C08F222/14C08F2/46B29C47/92B29C48/92
Inventor 刘江伟陆永俊郭月莹汪文昭矫阳张艳霞程安仁王连才曾心苗李淑凤
Owner BEIJING RADIATION APPL RES CENT
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