Polylactic acid/cellulose bio-based degradable composite material and preparation method thereof

A composite material, polylactic acid technology, applied in the field of polylactic acid/cellulose bio-degradable composite materials and its preparation, can solve the problem of thermal stability of polylactic acid/cellulose, failure to meet due requirements, organic solvents Unfavorable environmental protection and other issues, to achieve the effect of easy control, fast crystallization rate and simple operation

Inactive Publication Date: 2018-02-16
ZHEJIANG XINLI NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the solution method will introduce organic solvents, it is not conducive to environmental protection, nor is it conducive to industrial production.
[0005] Although traditional interfacial compatibilizers can solve the tensile strength, flexural strength and impact strength of PLA / cellulose composites to a certain extent, they are far from meeting the due requirements.
Secondly, interfacial compatibilizers cannot solve the bottleneck problem of poor thermal stability of polylactic acid / cellulose (Progress in Polymer Science, 2012, 37:1657–1677)

Method used

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  • Polylactic acid/cellulose bio-based degradable composite material and preparation method thereof
  • Polylactic acid/cellulose bio-based degradable composite material and preparation method thereof
  • Polylactic acid/cellulose bio-based degradable composite material and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0038] Preparation of D-polylactic acid polyurethane elastomer:

[0039] 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.

[0040] The preparation method of maleic anhydride grafted polylactic acid:

[0041] Maleic anhydride, L-polylactic acid (number-average molecular weight of polylactic acid is 150,000), and initiator (benzoyl peroxide) are m...

Embodiment 1

[0043] Get the prepared dextro-polylactic acid polyurethane (mass parts are 5), polylactic acid (the number-average molecular weight of polylactic acid is 150000, and its mass parts are 82), microcrystalline cellulose (mass parts are 10, Qufu Tianli Wanghu ) and maleic anhydride grafted polylactic acid (3 parts by mass) are evenly mixed (premixed at an initial temperature of 40°C, the premixer slowly increases from a low speed of 800 rpm to a high speed of 1200 rpm, and mixes for 30 minutes) , melt blended in a twin-screw extruder, the extrusion temperatures of the first to sixth stages are 175°C±5, 180°C±5, 185°C±5, 190°C±5, 180°C±5, 175°C ±5, after the extrudate is cooled, it is cut into pellets by a granulator to obtain pellets, and the pellets are dried in a vacuum oven at 85°C for 12h to obtain dextro-polylactic acid polyurethane / polylactic acid / cellulose composite pellets ( That is, polylactic acid / cellulose biodegradable composite material). According to GB / T 1040.1-20...

Embodiment 2

[0045] Get the prepared dextropolylactic acid polyurethane (mass parts are 5), polylactic acid (the number average molecular weight of polylactic acid is 150000, and its mass parts are 72), microcrystalline cellulose (mass parts are 20) and maleic anhydride Branched polylactic acid (3 parts by mass) is evenly mixed (pre-mixed at an initial temperature of 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), extruded in a twin-screw Melting and blending in the machine, the extrusion temperature of the first to sixth stages is 175°C±5, 180°C±5, 185°C±5, 190°C±5, 180°C±5, 175°C±5, the extruded product After cooling, the pellets were cut into pellets by a granulator to obtain pellets, which were dried in a vacuum oven at 85°C for 12 hours to obtain dextrorotatory polylactic acid polyurethane / polylactic acid / microcrystalline cellulose composite pellets (ie polylactic acid / polylactic acid / microcrystalline cellulose...

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Abstract

The invention discloses a polylactic acid/cellulose bio-based degradable composite material and a preparation method thereof. The polylactic acid/cellulose bio-based degradable composite material is prepared from the following raw materials in parts by weight: 40-85 parts of polylactic acid, 5-25 parts of a dextral polylactic acid-type polyurethane elastomer, 2-10 parts of maleic anhydride graftedpolylactic acid and 10-50 parts of cellulose, wherein the number average molecular weight of the polylactic acid is 100000-300000. The polylactic acid/cellulose bio-based degradable composite material is safe, non-toxic, biodegradable and excellent in mechanical properties. The preparation method comprises the following steps: uniformly mixing components, then adding into a twin-screw extruder, performing melt blending, drawing into strips, pelletizing, and drying to obtain the composite material. The preparation method is simple, easy to control, strong in operability and easy to implement,the production cost is low, and the industrial mass production is easy; the prepared composite material can be applied to the field of interior trim parts, films, fibers or other specially 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 / cellulose bio-based degradable composite material and a preparation method thereof. Background technique [0002] Cellulose is the most abundant and widely sourced biomass polymer in nature, which exists in tree inner bark, wood, plant seeds, leaves, roots, stems, etc. As an excellent reinforcing material, plant fiber is the most widely used because of its simple processing and low cost. Cellulose has the characteristics of high strength, high modulus and low density. The mechanical properties of flax and soft wood kraft fiber can be compared with the most common reinforcing material E-glass fiber. At the same time, compared with glass fiber, cellulose has many other advantages: (1) cellulose is renewable, has a wide range of sources, and is easy to obtain; (2) cellulose-reinforced plastics are discarded in landfill or burned, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L75/06C08L1/04C08L51/08C08G18/66C08G18/42C08G18/32C08F283/02C08F222/06
CPCC08L67/04C08F283/02C08G18/428C08G18/664C08L2201/06C08L2201/08C08L2205/035C08L75/06C08L1/04C08L51/08C08F222/06
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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