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
CN104448154AInactive Publication Date: 2015-03-25BEIJING RADIATION APPL RES CENT
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING RADIATION APPL RES CENT
Publication Date
2015-03-25
Estimated Expiration
Not applicable · inactive patent

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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