Polylactic acid/starch whole biological-base composite material and preparation method of composite material

A composite material and polylactic acid technology, which is applied in the field of polylactic acid/starch full bio-based composite materials and their preparation, can solve the problems of reducing the tensile strength at break of polylactic acid, heat tolerance of polylactic acid, and increasing the brittleness of polylactic acid. The effect of no serious loss of modulus, high heat resistance temperature and fast crystallization rate

Inactive Publication Date: 2018-03-09
ZHEJIANG XINLI NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, direct melt blending of starch and polylactic acid will further increase the brittleness of polylactic acid itself and reduce the tensile strength at break, impact strength and tensile toughness of polylactic ac

Method used

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  • Polylactic acid/starch whole biological-base composite material and preparation method of composite material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Preparation of dextro-polylactic acid polyurethane elastomer:

[0040] Firstly, the dextro-polylactide polyol (number average molecular weight is 2000), isophorone diisocyanate and dibutyltin dilaurate are reacted at 85℃ for 2h under the protection of protective gas (nitrogen) to obtain the prepolymer , Then add the chain extender 1,4-butanediol to carry out the chain extension reaction for 4h, after the reaction, remove the solvent to obtain the right-handed lactide polyol polyurethane elastomer (that is, the right-handed polylactic acid type polyurethane elastomer). The molar ratio of dextro-polylactide polyol, isophorone diisocyanate, and 1,4-butanediol chain extender is 1:3:2, dibutyltin dilaurate catalyst and dextro-polylactide The molar ratio of ester polyol is 0.005:1.

Example Embodiment

[0041] Example 1

[0042] Take the prepared dextro-polylactic acid polyurethane (5 parts by mass), polylactic acid (the number average molecular weight of polylactic acid is 150,000, and its mass parts is 85) and corn starch (10 parts by mass) after mixing uniformly (first in the initial The temperature is 40℃ for pre-mixing, the pre-mixer is slowly increased from low speed 800 rpm to high speed 1200 rpm, mixing for 30 minutes), melt blending in a twin-screw extruder, and the extrusion temperature of the first to sixth stages are successively 175℃±5, 180℃±5, 185℃±5, 190℃±5, 180℃±5, 180℃±5. After cooling the extrudate, it is pelletized by a pelletizer to obtain pellets. The material was dried in a vacuum drying oven at 85°C for 12 hours to prepare a dextro-polylactic acid polyurethane / polylactic acid / starch composite pellet. According to GB / T1040.1-2006 and ISO 179-1:98, dextrorotary polylactic acid polyurethane toughened and heat-resistant modified polylactic acid / starch composi...

Example Embodiment

[0043] Example 2

[0044] Take the prepared dextro-polylactic acid polyurethane (5 parts by mass), polylactic acid (the number average molecular weight of polylactic acid is 150,000, and its mass parts is 75) and corn starch (20 parts by mass) after mixing uniformly (first in the initial The temperature is 40℃ for pre-mixing, the pre-mixer is slowly increased from low speed 800 rpm to high speed 1200 rpm, mixing for 30 minutes), melt blending in a twin-screw extruder, and the extrusion temperature of the first to sixth stages are successively 175℃±5, 180℃±5, 185℃±5, 190℃±5, 180℃±5, 180℃±5. After cooling the extrudate, it is pelletized by a pelletizer to obtain pellets. The material was dried in a vacuum drying oven at 85°C for 12 hours to prepare a dextro-polylactic acid polyurethane / polylactic acid / starch composite pellet. According to GB / T1040.1-2006 and ISO 179-1:98, dextrorotary polylactic acid polyurethane toughened and heat-resistant modified polylactic acid / starch composi...

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Abstract

The invention discloses polylactic acid/starch whole biological-base composite material and a preparation method of the composite material. Based on 100 parts by weight of total raw materials, the composite material is prepared from the raw materials: 40-85 parts by weight of polylactic acid, 5-25 parts by weight of dextral polylactic acid-polyurethane and 7-50 parts of starch. The composite material is safe, non-toxic, and biodegradable, and has excellent mechanical properties. The preparation method comprises the following steps: uniformly mixing the raw material components, then adding themixed materials into a double-screw extruder for melting and blending, then performing pulling and pelletizing to obtain granular mixed resin, and performing drying to obtain the polylactic acid/starch whole biological-base composite material. The preparation method is simple and is easy to control; the operability is high; the implementation is easy; the production cost is low; the preparation method is easy for industrial large-scale production; and the prepared composite material can be applied to the fields of foaming materials, thin films, fibers, other special-shaped materials and the like.

Description

technical field [0001] The invention relates to the technical field of polylactic acid composite materials, in particular to a polylactic acid / starch all-bio-based composite material and a preparation method thereof. Background technique [0002] Due to the excellent biodegradability of polylactic acid relative to petroleum-based plastics, it can replace petroleum-based plastics in traditional fields of petroleum-based plastics such as disposable injection molding, foaming and blown film products to solve the increasingly serious "white pollution problem. Although the modification of polylactic acid can increase the lower heat distortion temperature of polylactic acid and expand the application of polylactic acid in related fields such as traditional plastics, this heat-resistant modification of polylactic acid will further increase its production cost. Another major reason why PLA is not widely promoted at present is the high price of PLA compared to traditional petroleum-...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L75/06C08L3/02C08G18/42C08G18/75C08G18/66C08G18/10C08G18/32
CPCC08L67/04C08G18/10C08G18/4277C08G18/664C08G18/755C08L2201/08C08L2203/12C08L2203/14C08L2203/16C08L2205/03C08L2207/02C08L75/06C08L3/02C08G18/3206
Inventor 路丹倪金平虞瑞雷陈培陈良光叶耀挺蔡智奇梁军杰
Owner ZHEJIANG XINLI NEW MATERIAL CO LTD
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