Preparation method of lignin-based electrostatic blended materials

A lignin-based, lignin-based technology, applied in the field of preparation of lignin-based electrostatic blended materials, can solve the problems of cumbersome process and unsuitability for industrial production, and achieve the effect of simple process, low price and increased strength

Active Publication Date: 2014-10-29
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of organic solvents are used in this preparation process, and the process is cumbersome, so it is not suitable for industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of a lignin-based electrostatic blended material, comprising the steps of:

[0037] (1) Take 10g of pine sawdust, put it into a 100ml autoclave, add 60ml of methanol, and react at a high temperature of 190°C for 2h. After cooling down to room temperature, dilute hydrochloric acid aqueous solution (pH=2) is used to precipitate lignin, and after being recovered by centrifugation, it is vacuum-dried to obtain methanol-organic pine lignin.

[0038] (2) Take 0.5g of methanol organic pine lignin obtained in step (1), add it to 8ml of pyridine solution and stir until fully dissolved, then add 8ml of acetic anhydride solution, stir at room temperature for 24h, and add the reaction solution dropwise to 100ml of cold water In the process, the acetyl lignin was recovered by filtration, washed with cold water until neutral, and dried in vacuum to obtain the acetyl lignin.

[0039] (3) Take 0.7 g of acetyl lignin and 1 g of commercial polystyrene, and dissolve th...

Embodiment 2

[0047] A preparation method of a lignin-based electrostatic blended material, comprising the steps of:

[0048] (1) Take 10g of pine sawdust, put it into a 100ml autoclave, add 60ml of methanol, and react at a high temperature of 190°C for 2h. After cooling down to room temperature, dilute hydrochloric acid aqueous solution (pH=2) is used to precipitate lignin, and after being recovered by centrifugation, it is vacuum-dried to obtain methanol-organic pine lignin.

[0049] (2) 1g of methanol organic pine lignin obtained in step (1) and 10ml of 2mol / L dilute hydrochloric acid are added together in a 25ml reaction flask, the suspension is stirred for 30min, filtered, the acidification process is repeated 5 times, and finally used Washing with deionized water, and drying the lignin solid part obtained after washing at 105° C. overnight to obtain acidified lignin.

[0050] (3) Take 0.7 g of the above-mentioned acidified lignin and 1 g of commercial polystyrene, and dissolve them i...

Embodiment 3

[0058] A preparation method of a lignin-based electrostatic blended material, comprising the steps of:

[0059] (1) Take 10g of wheat straw, crush it into 2mm long pieces, put it into a 100ml autoclave, add 70ml of ethylene glycol, and react at a high temperature of 190°C for 2h. After cooling down to room temperature, lignin is precipitated with dilute hydrochloric acid aqueous solution (pH=2), recovered by centrifugation and then vacuum-dried to obtain ethylene glycol organic wheat straw lignin.

[0060] (2) Add 1g of ethylene glycol organic wheat straw lignin prepared in step (1) and 10ml of 1mol / L dilute hydrochloric acid into a 25ml reaction bottle, stir the suspension for 30min, filter, and repeat the acidification process 5 times , and finally washed with deionized water, and the lignin solid part obtained after washing was dried overnight at 105° C. to obtain acidified lignin.

[0061] (3) Take 0.5g of the acidified lignin obtained in step (2) and 0.8g of commercial p...

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Abstract

The invention discloses a preparation method of lignin-based electrostatic blended materials. The method comprises the following steps: extracting lignin from a lignin raw material; or performing acetylation or acidifying modified treatment on the lignin; mixing the modified lignin with co-spinning materials according to the weight rate of 1 to 1-2, and dissolving in an organic solvent and proportioning into an electrostatic spinning solution with the solute content of 0.1-0.4g / mL; preparing the lignin-based electrostatic blended materials by using an electrostatic spinning process. The extracted or chemically-modified lignin is good in dissolubility in the organic solvent, and is mixed with high-molecular materials with high performance and dissolved in the organic solvent to be made into the spinning solution for performing electrostatic spinning, so that a compound fiber film material with security, non-toxicity, environmental protection property and degradability is prepared, and the current problems of resource shortage and environment crisis are solved. In addition, the raw materials are fully supplied, the equipment requirement is low, the preparation process is simple, and the industrial production is easy to realize.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a preparation method of a lignin-based electrostatic blended material. Background technique [0002] Lignin is a green, environmentally friendly and renewable natural polymer with abundant sources and low price. Its reserves are second only to cellulose, and it is the second largest type of organic matter in nature. The global terrestrial plants can synthesize about 60 billion tons of lignin every year. The pulp industry can produce about 50 million tons of industrial lignin every year, but most of the lignin is recycled as low-value fuel, resulting in a waste of resources. Improving the comprehensive utilization of lignin has become an important way to solve the current resource shortage and environmental problems. [0003] According to incomplete statistics, about 140 million tons of petroleum products are used in the preparation of synthetic polymers worldwide eve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/18D01D5/00C08H7/00D04H1/728D04H1/4382
Inventor 应汉杰朱晨杰夏治停曹治陈勇吴菁岚陈晓春
Owner NANJING TECH UNIV
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