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A biodegradable film modified by epoxidized lignin and its preparation method

A biodegradation and lignin technology, applied in the field of polymer materials, can solve the problems of low strength, high production cost, and poor processing performance of biodegradable films, so as to improve the melt strength, facilitate blown film processing, and solve the problems of processing performance and The effect of decreasing mechanical properties

Active Publication Date: 2021-04-23
NANJING TECH UNIV
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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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  • A biodegradable film modified by epoxidized lignin and its preparation method
  • A biodegradable film modified by epoxidized lignin and its preparation method
  • A biodegradable film modified by epoxidized lignin and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061](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 to the mixed solution, stir and react at 55 °C for 5 h, then add 50 parts of water, adjust the pH to 3.5 with 0.1 M hydrochloric acid, wash the solid collected by filtration with water to remove residual acid, dry and pulverize to obtain epoxy lignin. Among them, the alkali lignin is obtained from the black liquor of corncob and straw after alkali cooking;

[0062] (2) Add 60 parts of PBAT, 10 parts of PLA, 30 parts of epoxidized lignin, 3 parts of tributyl citrate, and 2 parts of zinc stearate in the high-mixer at 800 rpm The speed of rotation is mixed for 20 min to obtain the premix;

[0063] (3) Mix the premixed material described in step (2) through a twin-screw extruder and then granulate to obtain modified particles. The...

Embodiment 2

[0066] (1) Disperse enzymatic 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 ring Add oxychloropropane to the mixed solution, stir and react at 55 °C for 5 h, then add 50 parts of water, adjust the pH to 3.5 with 0.1 M hydrochloric acid, wash the solid collected by filtration with water to remove residual acid, dry and pulverize to obtain cyclo Oxygenated lignin; enzymatically decomposed lignin is obtained from the residue of corncobs and straws enzymatically hydrolyzed by cellulase;

[0067] (2) Add 45 parts of PBAT, 30 parts of PBS, 25 parts of epoxidized lignin described in step (1), 2 parts of glyceryl triacetate, and 1 part of ethylene bis stearic acid amide in the high mixer to The rotating speed of 1000 rpm, mixing 10 min, obtains premix;

[0068] (3) The premix described in step (2) is mixed by a twin-screw extrude...

Embodiment 3

[0071] (1) Disperse enzymatic 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 ring Add oxychloropropane to the mixed solution, stir and react at 55 °C for 5 h, then add 50 parts of water, adjust the pH to 3.5 with 0.1 M hydrochloric acid, wash the solid collected by filtration with water to remove residual acid, dry and pulverize to obtain cyclo Oxygenated lignin; enzymatically decomposed lignin is obtained from the residue of corncobs and straws enzymatically hydrolyzed by cellulase;

[0072] (2) Add 50 parts of PBS, 25 parts of PLA, 25 parts of epoxidized lignin described in step (1), 2 parts of triacetin, and 1 part of ethylene bis stearic acid amide into the high-mixer to The rotating speed of 1000 rpm, mixing 10 min, obtains premix;

[0073] (3) The premix described in step (2) is mixed by a twin-screw extruder and the...

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Abstract

The invention discloses a biodegradable film modified by epoxidized lignin and a preparation method thereof, comprising the following components in parts by weight: 50-95 parts of degradable plastic; 5-45 parts of epoxidized lignin; 0.5-5 parts of agent; 0.5-3 parts of lubricant, and the weight average molecular weight of the epoxidized lignin is not less than 5000. The invention uses epoxidized lignin with a certain molecular weight to modify and degrade plastics, which improves the compatibility and dispersion of lignin in the plastic matrix, and at the same time, the epoxy group of epoxidized lignin and the plastic macromolecule undergo graft expansion. The chain reaction improves the processing performance and mechanical properties of the material.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L67/04C08L97/00C08K5/11C08K5/103C08K5/098C08K5/20C08J5/18
CPCC08J5/18C08J2367/02C08J2467/02C08J2467/04C08J2497/00C08K5/098C08K5/103C08K5/11C08K5/20
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 TECH UNIV
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