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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

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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 acid.
[0005] In view of the above problems, this patent invented a simple and effective way to toughen PLA / starch composite materials, and at the same time, it can solve the problem of poor heat resistance of polylactic acid

Method used

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

Examples

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preparation example Construction

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

[0040] First, the prepolymer is obtained by reacting D-polylactide polyol (number average molecular weight: 2000), isophorone diisocyanate and dibutyltin dilaurate catalyst at 85°C for 2 hours under the protection of protective gas (nitrogen) , and then add the chain extender 1,4-butanediol to carry out the chain extension reaction for 4h, and remove the solvent after the reaction to obtain the dextrolactide polyol polyurethane elastomer (ie, the dextrolactide polyol polyurethane elastomer). The molar ratio of D-polylactide polyol, isophorone diisocyanate and 1,4-butanediol chain extender is 1:3:2, dibutyltin dilaurate catalyst and D-polylactide The molar ratio of ester polyol is 0.005:1.

Embodiment 1

[0042]Get the prepared D-polylactic acid polyurethane (5 parts by mass), polylactic acid (the number-average molecular weight of polylactic acid is 150000, and its parts by mass is 85) and cornstarch (10 parts by mass) and mix evenly (first in the initial The temperature is pre-mixed at 40°C, the pre-mixer is slowly increased from a low speed of 800 rpm to a high speed of 1200 rpm, and mixed for 30 minutes), melted and blended in a twin-screw extruder, and the extrusion temperatures of the first to sixth stages are sequentially 175°C±5, 180°C±5, 185°C±5, 190°C±5, 180°C±5, 180°C±5, after the extrudate is cooled, it is pelletized by a granulator to obtain pellets, and the pellets The material was dried in a vacuum drying oven at 85° C. for 12 hours to obtain dextrorotatory polylactic acid polyurethane / polylactic acid / starch composite pellets. According to GB / T1040.1-2006 and ISO 179-1:98, the toughened and heat-resistant polylactic acid / starch composite material of D-polylactic ...

Embodiment 2

[0044] Get the prepared D-polylactic acid polyurethane (5 parts by mass), polylactic acid (the number-average molecular weight of polylactic acid is 150000, and its parts by mass is 75) and cornstarch (20 parts by mass) after mixing evenly (first in the initial The temperature is pre-mixed at 40°C, the pre-mixer is slowly increased from a low speed of 800 rpm to a high speed of 1200 rpm, and mixed for 30 minutes), melted and blended in a twin-screw extruder, and the extrusion temperatures of the first to sixth stages are sequentially 175°C±5, 180°C±5, 185°C±5, 190°C±5, 180°C±5, 180°C±5, after the extrudate is cooled, it is pelletized by a granulator to obtain pellets, and the pellets The material was dried in a vacuum drying oven at 85° C. for 12 hours to obtain dextrorotatory polylactic acid polyurethane / polylactic acid / starch composite pellets. According to GB / T1040.1-2006 and ISO 179-1:98, the toughened and heat-resistant polylactic acid / starch composite material of D-polyl...

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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