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A kind of hindered amine modified lignin and its preparation method and application

A technology of lignin and hindered amine, which is applied in the field of lignin materials, can solve the problems that the UV protection performance is difficult to achieve chemically synthesized light stabilizers, serious molecular agglomeration, and low content of functional groups, etc., to achieve rich types and application ranges, and simple production process , the effect of short reaction time

Active Publication Date: 2019-07-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current commercial lignin mainly comes from the waste of the pulp and paper industry. Its molecular agglomeration is serious, mainly in the form of micron-sized particles, which is difficult to disperse evenly, and the color is too dark; moreover, it can effectively absorb ultraviolet rays and scavenge free radicals. Too little, the UV protection performance of unmodified lignin is also difficult to reach the level of chemically synthesized light stabilizers

Method used

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  • A kind of hindered amine modified lignin and its preparation method and application
  • A kind of hindered amine modified lignin and its preparation method and application
  • A kind of hindered amine modified lignin and its preparation method and application

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Effect test

Embodiment 1

[0035] (1) Dissolve 30g of 2,2,6,6-tetramethyl-4-piperidinol and 10g of epichlorohydrin in 20g of dimethylformamide, heat to 80°C, melt and mix evenly, add 1g of three A boron fluoride catalyst was reacted at 80° C. for 2 hours to obtain a chlorotetramethylpiperidine intermediate;

[0036] (2) Dissolve 100g of lignosulfonate in alkaline aqueous solution, prepare 20% solid content, adjust pH=10; then heat up to 90°C, add dropwise the chlorotetramethylpiperene prepared in step (1) Pyridine intermediate, after dripping, keep warm at 90°C for 1 hour to obtain tetramethylpiperidine grafted modified lignin, the structure diagram is shown in figure 1 .

Embodiment 2

[0038] (1) Dissolve 50g of 2,2,6,6-tetramethyl-4-piperidinol and 20g of epichlorohydrin in 40g of dimethylacetamide, heat to 50°C, melt and mix evenly, add 1g of chloride Aluminum catalyst, reacted for 1.5 hours at 50°C to obtain a chlorotetramethylpiperidine intermediate;

[0039] (2) Dissolve 100g of alkali lignin in an alkaline aqueous solution to prepare a solid content of 25%, and adjust the pH to 12; then heat up to 80°C, and add dropwise the chlorinated tetramethylpiperidine prepared in step (1) After the dripping is completed, keep the reaction at 80°C for 2 hours to obtain tetramethylpiperidine grafted modified lignin.

Embodiment 3

[0041] (1) Dissolve 60g of 2,2,6,6-tetramethyl-4-piperidinol and 20g of epichlorohydrin in 20g of tetrahydrofuran and 20g of dioxane, heat to 50°C, melt and mix well, add 1.5g Tin tetrachloride catalyst, heating up at 55 DEG C and reacting for 2 hours, obtains chlorotetramethylpiperidine intermediate;

[0042] (2) Dissolve 100g of solvent-based lignin in an alkaline aqueous solution to prepare a solid content of 40%, and adjust the pH to 14; then heat up to 70°C, and add the chlorotetramethylpiperidine prepared in step (1) dropwise The intermediate, after the dripping is completed, is kept at 70° C. for 3 hours and reacted to obtain tetramethylpiperidine grafted modified lignin.

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Abstract

The invention belongs to the technical field of lignin materials and discloses hindered amine modified lignin as well as a preparation method and an application thereof. According to the preparation method, 2,2,6,6-tetramethyl-4-piperidinol and epichlorohydrin are subjected to a reaction under the catalysis of a catalyst, and a chloro-tetramethylpiperidine intermediate is obtained; the chloro-tetramethylpiperidine intermediate and lignin react in an alkaline solution, and tetramethylpiperidine grafted lignin is obtained. The hindered amine modified lignin is prepared from components in parts by mass as follows: 100 parts of lignin, 10-20 parts of epichlorohydrin, 1-3 parts of a catalyst and 30-60 parts of 2,2,6,6-tetramethyl-4-piperidinol. The hindered amine modified lignin prepared with the method is novel modified lignin containing hindered amine groups, has photo-stabilization groups of hindered amine and aromatic ring structures of lignin, can serve as a polymeric photostabilizer to be used in various photodecomposition resisting fields such as pesticide preparations, coatings, ink, sun cream, high polymer materials and the like.

Description

technical field [0001] The invention belongs to the technical field of lignin materials, in particular to a hindered amine modified lignin and its preparation method and application. Background technique [0002] As a natural polymer aromatic polymer derived from plants, lignin itself contains a large number of conjugated structures such as benzene rings and carbonyl groups, and its phenolic hydroxyl groups can also scavenge free radicals. Therefore, lignin has certain ultraviolet absorption and Antioxidant properties. Structurally, lignin is mainly obtained from three basic structural units of guaiacylpropane, p-hydroxyphenylpropane and syringylpropane through enzymatic deoxygenation polymerization and free radical coupling. However, the current commercial lignin mainly comes from the waste of the pulp and paper industry. Its molecular agglomeration is serious, mainly in the form of micron-sized particles, which is difficult to disperse evenly, and the color is too dark; m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 邱学青周明松汪冬平杨东杰楼宏铭
Owner SOUTH CHINA UNIV OF TECH
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