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Preparation method of lignin having good melting property

A lignin and performance technology, applied in the field of lignin processing, can solve the problems of poor melting performance and achieve the effects of short time consumption, excellent melting performance and low energy consumption

Inactive Publication Date: 2019-01-01
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, compared with the lignin structural monomers of broad-leaved wood, the linkages of the lignin structural monomers of coniferous woods contain more carbon-carbon bonds, which leads to more cross-linked structures of lignin of coniferous woods, making its It is difficult to melt when heated, showing poor melting performance

Method used

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  • Preparation method of lignin having good melting property
  • Preparation method of lignin having good melting property
  • Preparation method of lignin having good melting property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix and stir 560g black liquor powder with appropriate amount of water to form a solution with a concentration of about 18%. After stirring evenly, filter with qualitative filter paper with a pore size of 10-15 μm to remove insoluble matter in the black liquor. Take the filtered filtrate and add hydrochloric acid with a concentration of 6mol / L several times until the pH value of the solution is adjusted to about 2.5, stir with a magnetic stirrer for 30min, and then filter the solution with a qualitative filter paper with a pore size of 10-15 μm. The precipitate was taken out and vacuum-dried, and the sample was completely dried and then ground and passed through a 150-mesh sieve to obtain coniferous wood lignin powder.

[0032] The coniferous wood chips and polyethylene glycol were mixed in a mass ratio of 1:2, the heating temperature was 140° C., and the heating time was 2 hours. After the heat treatment, pour the black liquor in the heated product into pure water, sti...

Embodiment 2

[0036] The softwood lignin powder was prepared by the method in Example 1. The coniferous wood chips and polyethylene glycol were mixed at a mass ratio of 1:3, the heating temperature was 160° C., and the heating time was 2 hours. After the heat treatment, pour the black liquor in the heated product into pure water, stir with a magnetic stirrer, the rotation speed of the magnetic rotor is 200 rpm, and the stirring time is 1h; the liquid after stirring is filtered with filter paper, the The pore size is 2μm-14μm. After drying, polyethylene glycol lignin is obtained.

[0037] Coniferous wood lignin and polyethylene glycol lignin were uniformly mixed at a ratio of 5:1 at a temperature of 50° C. to obtain fusible coniferous wood lignin powder.

[0038] TMA-4000S System (MAC Science System 010) thermomechanical analyzer was used to measure the thermomechanical behavior of softwood lignin after treatment, see figure 2 . The curve has a glass transition temperature as well as a ...

Embodiment 3

[0040]The softwood lignin powder was prepared by the method in Example 1. The coniferous wood chips and polyethylene glycol were mixed in a mass ratio of 1:4, the heating temperature was 160° C., and the heating time was 1 h. After the heat treatment, pour the black liquor in the heated product into pure water, stir with a magnetic stirrer, the rotation speed of the magnetic rotor is 200 rpm, and the stirring time is 2h; the liquid after stirring is filtered with filter paper, and the The pore size is 2μm-14μm. After drying, polyethylene glycol lignin is obtained.

[0041] Coniferous wood lignin and polyethylene glycol lignin were uniformly mixed at a ratio of 4:1 at a temperature of 70° C. to obtain fusible coniferous wood lignin powder.

[0042] TMA-4000S System (MAC Science System 010) thermomechanical analyzer was used to measure the thermomechanical behavior of softwood lignin after treatment, see image 3 . The curve has a glass transition temperature as well as a he...

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Abstract

The invention provides a preparation method of lignin having good melting property. The preparation method comprises: (1) separating and extracting softwood lignin powder from pulping papermaking by using an acid precipitation method; (2) separating and extracting polyethylene glycol lignin from softwood by using polyethylene glycol as a solvent; and (3) uniformly mixing the softwood lignin and the polyethylene glycol lignin according to different ratios to obtain the meltable softwood lignin powder. According to the present invention, the softwood lignin powder obtained by the preparation method has excellent melting performance, can be well melted into the low viscosity state under the heating condition, and can be used for the melt spinning preparation of lignin-based fibers or carbon fibers and other materials; and the method has advantages of convenient operation, low energy consumption, short time consumption, low cost and good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of lignin processing, and in particular relates to a method for melting and modifying coniferous wood lignin extracted from industrial pulping and papermaking waste liquid to have melting properties. Background technique [0002] As one of the most promising new materials in the 21st century, carbon fiber has superior properties such as high tensile strength, high elastic modulus, high electrical conductivity, high temperature resistance, and corrosion resistance, and can be processed into carbon fiber composite materials for aerospace (17 %), automobile and wind energy industry (67%), sporting goods (16%) and other fields. After activating carbon fiber, activated carbon fiber with high specific surface area can not only be applied to energy storage materials (such as positive and negative electrode materials of double-layer capacitors, lithium battery negative electrode materials, materials for storing hydr...

Claims

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Application Information

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IPC IPC(8): C08L97/00C08L71/02C08H7/00
CPCC08H6/00C08L97/005C08L71/02
Inventor 林剑张方达赵广杰商俊博
Owner BEIJING FORESTRY UNIVERSITY
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