Biodegradable film modified by epoxidized lignin and preparation method thereof

A biodegradation and lignin technology, applied in the field of polymer materials, can solve the problems of poor processing performance, high production cost and low strength of biodegradable films, and can solve the problems of reduced processing performance and mechanical properties, good environment, and improved melt. the effect of strength

Active Publication Date: 2020-07-31
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: The technical problem to be solved by this invention is to provide a biodegradable film modified by epoxidized lignin for the problems of poor processability, low strength and high production cost in the prior art.

Method used

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  • Biodegradable film modified by epoxidized lignin and preparation method thereof
  • Biodegradable film modified by epoxidized lignin and preparation method thereof
  • Biodegradable film modified by epoxidized lignin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Disperse alkali lignin at a mass ratio of 1:20 in a mixed solution made of 50 parts of water / acetone at a volume ratio of 1:1, filter to remove insoluble matter, and then add 3 parts of sodium hydroxide and 20 parts of epoxy Add chloropropane into the mixed solution, stir and react at 55°C for 5 hours, then add 50 parts of water, adjust the pH to 3.5 with 0.1M hydrochloric acid, wash the solid collected by filtration with water to remove residual acid, dry and pulverize to obtain epoxidized wood white. Among them, the alkali lignin is obtained from the black liquor of corncob and straw after alkali cooking;

[0048] (2) Add 60 parts of PBAT, 10 parts of PLA, 30 parts of epoxidized lignin described in step (1), 3 parts of tributyl citrate, 2 parts of zinc stearate in the high mixer, with 800rpm Rotating speed, mix 20min, obtain premix;

[0049] (3) Mix the premix described in step (2) with a twin-screw extruder and then granulate to obtain modified particles. The t...

Embodiment 2

[0052](1) Disperse enzymatic lignin in a mixed solution made of 50 parts of water / acetone with a volume ratio of 1:1 at a mass ratio of 1:20, filter to remove insoluble matter, and then add 3 parts of sodium hydroxide and 20 parts of ring Add oxychloropropane to the mixed solution, stir and react at 55°C for 5 hours, then add 50 parts of water, adjust the pH to 3.5 with 0.1M hydrochloric acid, wash the solid collected by filtration with water to remove residual acid, dry and pulverize to obtain epoxidized Lignin; the enzymatic lignin is obtained from the residue of corncobs and straws enzymatically hydrolyzed by cellulase;

[0053] (2) add 45 parts of PBAT, 30 parts of PBS, epoxidized lignin described in 25 parts of steps (1), 2 parts of triacetin, 1 part of ethylene bis stearic acid amide in high mixer, with The rotating speed of 1000rpm, mix 10min, obtain premix;

[0054] (3) Mix the premix described in step (2) with a twin-screw extruder and then granulate to obtain modifi...

Embodiment 3

[0057] (1) Disperse enzymatic lignin in a mixed solution made of 50 parts of water / acetone with a volume ratio of 1:1 at a mass ratio of 1:20, filter to remove insoluble matter, and then add 3 parts of sodium hydroxide and 20 parts of ring Add oxychloropropane to the mixed solution, stir and react at 55°C for 5 hours, then add 50 parts of water, adjust the pH to 3.5 with 0.1M hydrochloric acid, wash the solid collected by filtration with water to remove residual acid, dry and pulverize to obtain epoxidized Lignin; the enzymatic lignin is obtained from the residue of corncobs and straws enzymatically hydrolyzed by cellulase;

[0058] (2) add 50 parts of PBS, 25 parts of PLA, epoxidized lignin described in 25 parts of step (1), 2 parts of triacetin, 1 part of ethylene bis stearic acid amide in high mixer, with The rotating speed of 1000rpm, mix 10min, obtain premix;

[0059] (3) Mix the premix described in step (2) with a twin-screw extruder and then granulate to obtain modifie...

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Abstract

The invention discloses a biodegradable film modified by epoxidized lignin and a preparation method thereof. The biodegradable film comprises the following components in parts by weight: 50-95 parts of degradable plastic; 5 to 45 parts of epoxidized lignin; 0.5 to 5 parts of a plasticizer; and 0.5-3 parts of a lubricant, wherein the weight-average molecular weight of the epoxidized lignin is not less than 5000. The epoxidized lignin with a certain molecular weight is used for modifying and degrading plastic, the compatibility and dispersity of lignin in a plastic matrix are improved, meanwhile, an epoxy group of the epoxidized lignin and plastic macromolecules are subjected to a grafting chain extension reaction, and the processing performance and mechanical performance of the material areimproved.

Description

technical field [0001] The invention relates to a biodegradable film modified by epoxidized lignin and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] Plastic films play an irreplaceable role in the fields of packaging and agricultural coverage. Compared with traditional non-degradable or partially degradable films, fully biodegradable films can be completely degraded by microorganisms in nature in a short period of time, leaving no plastic residues Debris greatly reduces the adverse impact on the ecological environment, so the development of fully biodegradable films is currently the main direction to solve the problem of plastic film pollution in the world. [0003] A variety of polyester plastics such as polybutylene terephthalate / adipate (PBAT), polylactic acid (PLA), polycaprolactone (PCL), polybutylene succinate (PBS), Polybutylene succinate / adipate (PBSA), aliphatic polycarbonate (APC), etc. have been proven to...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L67/04C08L97/00C08K5/11C08K5/103C08K5/098C08K5/20C08J5/18
CPCC08J5/18C08J2367/02C08J2467/02C08J2467/04C08J2497/00C08K5/11C08K5/103C08K5/098C08K5/20
Inventor 应汉杰贾运秀李明朱晨杰庄伟唐成伦谭卓涛沈涛柳东陈勇牛欢青杨朋朋吴菁岚高南欧阳平凯
Owner NANJING UNIV OF TECH
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