Environment-friendly toughening nano-cellulose-polylactic acid biodegradable material and preparation method thereof

A biodegradable material and nanocellulose technology, applied in the field of polymer processing, can solve the problems of long time for material preparation, poor nanocellulose dispersibility, etc., and achieve excellent interface compatibility, good dispersion performance, and excellent elongation at break. and impact strength

Inactive Publication Date: 2019-03-19
JIANGSU ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned problems of poor dispersion of nanocellulose in polylactic acid matrix and time-consuming material preparation, the present invention provides an environmentally friendly and toughened nanocellulose-polylactic acid biodegradable material and its preparation method, in which nanocellulose and toughening agent Coating and mixing are realized in an organic solvent, and the mixed colloid, processing aids and polylactic acid are mixed in a twin-screw extruder through solvent evaporation and melt blending to realize the blending and compounding of nanocellulose and polylactic acid. Nanocellulose-polylactic acid biodegradable material

Method used

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  • Environment-friendly toughening nano-cellulose-polylactic acid biodegradable material and preparation method thereof
  • Environment-friendly toughening nano-cellulose-polylactic acid biodegradable material and preparation method thereof
  • Environment-friendly toughening nano-cellulose-polylactic acid biodegradable material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Preparation of environmentally friendly toughened nanocellulose-polylactic acid biodegradable material

[0029] The environmentally friendly and toughened nanocellulose-polylactic acid biodegradable material prepared in this example includes the following components in weight percentage: 77% polylactic acid, 4% microfibrous cellulose, 16% modifier, and the balance is auxiliary agent In the above-mentioned modifying agent, the mass ratio of glyceryl triacetate and polyvinyl alcohol is 1:1, and the mass percent of polyvinyl alcohol in polyvinyl alcohol aqueous solution is 1% auxiliary agent is made of Y-aminopropyltriethylsilane, Cetyltrimethylammonium bromide, talc powder, and polyethylene wax are obtained by mixing sequentially at a mass ratio of 3:2:1:1.5; wherein, the preparation method of microfibrous cellulose refers to the method disclosed in patent CN105622766B.

[0030] The preparation method is as follows:

[0031] 1) Prepare 1000ml of microfibrous ce...

Embodiment 2

[0042] An environmentally friendly and toughened nano-cellulose-polylactic acid biodegradable material and its preparation method, the nano-cellulose-polylactic acid biodegradable material includes the following components in weight percentage: polylactic acid 70%, cellulose nano-whiskers 20% , modifier (the mass ratio of triacetin and polyvinyl alcohol is 5:1, the concentration of polyvinyl alcohol aqueous solution is 10%) 8%, and the balance is additives (Y-aminopropyltriethylsilane: talc powder: polyethylene wax=0.5:0.2:0.3); in this embodiment, the preparation method of cellulose nano whiskers refers to patent CN105648816A.

[0043] Concrete preparation steps are as follows:

[0044] 1) Prepare 50ml of 20% cellulose nanowhisker colloidal solution by centrifuging 250ml of 4% cellulose nano whisker aqueous solution (10g of cellulose nano whisker) at 4000rpm for 5min;

[0045] 2) Put 50ml of cellulose nano whisker colloidal solution in step 1) into a glass container, pour 20...

Embodiment 3

[0053] An environmentally friendly and toughened nanocellulose-polylactic acid biodegradable material and its preparation method, the nanocellulose-polylactic acid biodegradable material includes the following components in weight percentage: polylactic acid 72%, cellulose nanofibrils 10% , toughening agent triacetin and polyvinyl alcohol 10%, wherein the ratio of triacetin and polyvinyl alcohol is 3:1, and other processing aids are 1%. The preparation method comprises the following steps:

[0054] 1) Prepare 500ml of 2% cellulose nanofibril solution (10g of cellulose nanofibril) by centrifugation at 3000rpm for 10min to prepare 66.7ml of 15% cellulose nanofibril colloid. Refer to the preparation method of cellulose nanofibril Patent CN101691698A.

[0055] 2) Put 66.7ml of cellulose nanofibril colloid with a concentration of 15% in step 1) in a glass container, pour 200ml of acetone solvent and deionized water mixed solvent, the volume ratio of acetone solvent and deionized wa...

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Abstract

The invention discloses an environment-friendly toughening nano-cellulose-polylactic acid biodegradable material and a preparation method thereof, and belongs to the field of polymer processing. The biodegradable material comprises polylactic acid, nano-cellulose, glycerol triacetate, polyvinyl alcohol water solution and additives. The invention further discloses a preparation method of the biodegradable material. The method includes the steps: coating and mixing the nano-cellulose and toughening agents in organic solvents in advance; placing mixed colloids, processing agents and polylactic acid in a twin-screw extruder to blend and compound the nano-cellulose and the polylactic acid through dual functions of solvent evaporation and melt blending to obtain the biodegradable material. The method is simple and convenient to operate, short in preparation time, dispersibility of the nano-cellulose in a polylactic acid substrate is achieved, and the prepared composite material improves toughness and has environmental safety.

Description

technical field [0001] The invention relates to the technical field of polymer processing, in particular to an environment-friendly toughened nanocellulose-polylactic acid biodegradable material and a preparation method thereof. Background technique [0002] In recent years, due to the destruction of the environment by "white pollution" and the stricter environmental protection regulations and corresponding standards, the development of biodegradable materials is one of the important solutions to solve the energy crisis of consuming petroleum. Among many degradable materials, polylactic acid is favored because of its considerable mechanical properties and transparency. The production process of polylactic acid has almost no environmental pollution and damage, and the product can be biodegraded, and finally generate carbon dioxide and water to be absorbed by soil organic matter. the carbon cycle process. However, there are still many defects in polylactic acid, such as high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L1/02C08L29/04C08L23/06C08K13/02C08K5/103C08K5/544C08K5/19C08K3/34
CPCC08L67/04C08L2201/06C08L2205/035C08L2205/16C08L1/02C08L29/04C08L23/06C08K13/02C08K5/103C08K5/544C08K5/19C08K3/34
Inventor 雍宬孙恩惠黄红英曲萍徐跃定黄莹吴华山曹云张晶
Owner JIANGSU ACAD OF AGRI SCI
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