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Hindered amine modified lignin as well as preparation method and application thereof

A technology of lignin and hindered amine, which is applied in the field of lignin materials, can solve the problems of chemically synthesized light stabilizers, low content of functional groups, serious molecular agglomeration and other problems in UV protection performance, and achieve rich variety and application range and short reaction time , The effect of simple production process

Active Publication Date: 2018-06-19
SOUTH CHINA UNIV OF TECH
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  • 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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  • Hindered amine modified lignin as well as preparation method and application thereof
  • Hindered amine modified lignin as well as preparation method and application thereof
  • Hindered amine modified lignin as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0035] (1) Dissolve 30g 2,2,6,6-tetramethyl-4-piperidinol and 10g parts of epichlorohydrin in 20g dimethylformamide, heat to 80℃, melt and mix uniformly, add 1g three Using boron fluoride catalyst, react at 80°C for 2 hours to obtain 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 chlorotetramethylpiperone prepared in step (1) The pyridine intermediate, after the completion of the dripping, the reaction is kept at 90℃ for 1 hour to obtain tetramethylpiperidine grafted modified lignin. See the structure diagram figure 1 .

Embodiment 2

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

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

Embodiment 3

[0041] (1) Dissolve 60g 2,2,6,6-tetramethyl-4-piperidinol and 20g epichlorohydrin in 20g tetrahydrofuran and 20g dioxane, heat to 50℃, melt and mix uniformly, add 1.5g With tin tetrachloride catalyst, react at 55°C for 2 hours at elevated temperature to obtain chlorotetramethylpiperidine intermediate;

[0042] (2) Dissolve 100g of solvent-based lignin in alkaline aqueous solution, prepare 40% solid content, adjust pH=14; then heat to 70°C, add dropwise the chlorotetramethylpiperidine prepared in step (1) After the completion of the dripping, the intermediate is incubated and reacted at 70°C for 3 hours 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, and particularly relates to a hindered amine modified lignin and a preparation method and application thereof. Background technique [0002] As a natural high molecular aromatic polymer derived from plants, lignin itself contains a large number of conjugated structures such as benzene ring and carbonyl group. The phenolic hydroxyl group can also scavenge free radicals. Therefore, lignin has certain ultraviolet absorption and Antioxidant properties. Structurally, lignin is mainly derived from three basic structural units of guaiacylpropane, p-hydroxyphenylpropane and syringylpropane through enzyme deoxygenation polymerization and free radical coupling. However, the current commercial lignin is mainly derived from the wastes of the pulp and paper industry, and its molecular agglomeration is serious, mainly in micron particles, which is difficult to disperse uniformly, and the color is too dark...

Claims

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Application Information

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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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