A kind of preparation method and application of lignin modified product

A technology of modified substances and lignin, which is applied in the field of lignin reuse and re-application, can solve the problems of poor structural regularity of graft copolymers, poor functional consistency of modified polymers, and difficult control of the reaction process, etc., to achieve improved The effects of applying added value, alleviating resource crisis, and improving utilization

Active Publication Date: 2019-09-10
QILU UNIV OF TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the free radical polymerization method is adopted in the above-mentioned technology, the reaction process of this polymerization method is difficult to control, the graft position selectivity is poor, the structure regularity of the graft copolymer obtained is poor, and the molecular weight distribution is discrete, resulting in poor functional consistency of the modified polymer obtained.

Method used

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  • A kind of preparation method and application of lignin modified product
  • A kind of preparation method and application of lignin modified product
  • A kind of preparation method and application of lignin modified product

Examples

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Effect test

Embodiment 1

[0040] The preparation method of lignin-DMC graft copolymer: add a certain amount of alkali lignin in the electrolytic cell, add an appropriate amount of deionized water to dissolve, adjust the required pH, and then add a certain amount of DMC, the concentration of alkali lignin is 10g / L, alkali lignin: DMC ratio of 1:9, heated in water bath to the required temperature of 70°C, stirred with a magnetic stirrer (rotating speed 200 r / min), inserted anode and cathode electrodes (the effective area of ​​anode and cathode is 3.5 cm×4 cm respectively , the distance between the two electrodes is 5 cm), turn on the power button, adjust the voltage to 2.5v, let the lignin graft copolymerization reaction start, the reaction time is 6h, after the reaction, the sample is in ethanol with a mass fraction ≥75% Precipitate, let it stand for enough time, after the precipitation is completely settled, pour off the supernatant, leave the precipitate, wash the copolymer twice with ethanol with a m...

Embodiment 2

[0042] The preparation method of lignin-DMC graft copolymer: add a certain amount of alkali lignin in the electrolytic cell, add an appropriate amount of deionized water to dissolve, adjust the required pH, and then add a certain amount of DMC, the concentration of alkali lignin is 2.5 g / L, alkali lignin:DMC ratio is 1:7, heated in water bath to the required temperature of 40°C, stirred with magnetic stirrer (rotating speed 200 r / min), inserted cathode and anode electrodes (the effective area of ​​anode and cathode is 3.5 cm×4 cm, the distance between the two electrodes is 5 cm), turn on the power button, adjust the voltage to 3.5v, let the lignin graft copolymerization reaction start, the reaction time is 4h, after the reaction, the sample is in ethanol with a mass fraction ≥75% Precipitate in the medium, let it stand for enough time, after the precipitation is completely settled, pour off the supernatant, leave the precipitation, wash the copolymer twice with ethanol with a m...

Embodiment 3

[0044]The preparation method of lignin-DMC graft copolymer: add a certain amount of alkali lignin in the electrolytic cell, add an appropriate amount of deionized water to dissolve, adjust the required pH, and then add a certain amount of DMC, the concentration of alkali lignin is 7.5 g / L, alkali lignin: DMC ratio of 1:5, heated in a water bath to the required temperature of 70°C, stirred with a magnetic stirrer (rotating speed 200 r / min), inserted the cathode and anode electrodes (the effective area of ​​the anode and cathode were 3.5 cm×4 cm, the distance between the two electrodes is 5 cm), turn on the power button, adjust the voltage to 5.5v, let the lignin graft copolymerization reaction start, the reaction time is 3h, after the reaction, the sample is in ethanol with a mass fraction ≥75% Precipitate in the medium, let it stand for enough time, after the precipitation is completely settled, pour off the supernatant, leave the precipitation, wash the copolymer twice with et...

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Abstract

The invention belongs to the field of reutilization and reapplication of lignin and relates to reutilization and reapplication of alkali lignin of poplar, in particular to a preparation method and anapplication of a lignin modifier. The invention comprises two parts, one part is preparation of a cationic lignin grafted polymer from DMC (methacryloxyethyltrimethyl ammonium chloride) cationic monomers as the raw material by electrocatalysis of alkali lignin and DMC copolymerization, and the other part is the application of the cationic lignin grafted polymer to wastewater of an industrial cationic dye ethyl violet. Lignin is successfully grafted with DMC, the cationic lignin grafted polymer is obtained and has good flocculation treatment effect on dye wastewater, lignin is utilized very well, and utilization rate of biomass resources is increased.

Description

technical field [0001] The invention belongs to the field of reuse and re-application of lignin, relates to the re-use and re-application of poplar alkali lignin, and particularly relates to a preparation method and application of a modified lignin. Background technique [0002] Lignin is one of the important components of plants and the largest renewable energy source for aromatic compounds. It contains about 30% in coniferous wood and 20% in hardwood. The high-value utilization of lignin in the field of materials has always been concerned. People have polymerized and modified lignin through chemical reactions, and are committed to researching high-performance, low-cost lignin modified materials or chemicals, or through designable, easy Controlled degradation method to produce important chemical raw materials. [0003] As the only natural polymer raw material with aromatic structure, lignin is widely used in various industries such as surfactants and flocculants. Due to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F289/00C08F220/34C02F1/56
Inventor 孔凡功赵鑫李燕仲亚杰王守娟刘忠明
Owner QILU UNIV OF TECH
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