Lignin modification method and preparation method of lignin-based epoxy resin

A technology based on epoxy resin and lignin, which is applied in the field of compound modification, can solve the problems of non-biodegradable toxicity and the complexity of ionic liquid synthesis, and achieve the effects of alleviating the energy crisis, easy implementation, and high utilization efficiency

Active Publication Date: 2019-03-15
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the complexity of synthesis, non-biodegradability and certain toxicity of ionic liquids prevent them from being widely used in industrial production.

Method used

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  • Lignin modification method and preparation method of lignin-based epoxy resin
  • Lignin modification method and preparation method of lignin-based epoxy resin
  • Lignin modification method and preparation method of lignin-based epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Modification of lignin

[0030] Weigh choline chloride and urea into a 250mL beaker, stir in a water bath at 70°C until a uniform solution is formed, and obtain eutectic melt I with a molar ratio of choline chloride and urea of ​​2.1; weigh 1.0g of wood Plain element and 0.1g nickel oxide are placed in the autoclave, the eutectic melt I that will make is added in the autoclave (the mass ratio of lignin, eutectic melt and metal oxide is 1:20:0.1), in Under 1Mpa nitrogen atmosphere, react at 80°C and 100r / min for 2h under continuous stirring, then wash the product with water, centrifuge, filter, and vacuum dry to obtain modified lignin 1.

Embodiment 2

[0032] Modification of lignin

[0033] Weigh choline chloride and urea into a 250mL beaker, stir in a water bath at 100°C until a uniform solution is formed, and obtain eutectic melt I with a molar ratio of choline chloride and urea of ​​2.5; weigh 1.0g of wood Primer and 0.1g cobalt oxide are placed in the autoclave, and the eutectic I made is added in the autoclave (the mass ratio of lignin, eutectic and metal oxide is 1:40:0.1), in Under 1Mpa nitrogen atmosphere, react at 110°C and 100r / min for 5h under continuous stirring, then wash the product with water, centrifuge, filter, and vacuum dry to obtain modified lignin 2.

Embodiment 3

[0035] Modification of lignin

[0036] Weigh choline chloride and urea and place them in a 250mL beaker, stir in a water bath at 90°C until a uniform solution is formed to obtain eutectic melt I with a molar ratio of choline chloride and urea of ​​4; weigh 1.0g Lignin and 0.5g chromium oxide are placed in the autoclave, and the eutectic I made is added in the autoclave (the mass ratio of lignin, eutectic and metal oxide is 1:30:0.5), Under 1Mpa nitrogen atmosphere, react at 100°C and 200r / min for 4h under constant stirring, then wash the product with water, centrifuge, filter, and vacuum dry to obtain modified lignin 3.

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Abstract

The invention discloses a lignin modification method, which comprises the following steps: adding lignin and a metal oxide into a eutectoid for modification reaction, and separating the mixture afterthe reaction is finished, so as to obtain modified lignin. The invention further provides a preparation method of lignin-based epoxy resin based on the lignin modification method. According to the lignin modification method disclosed by the invention, the eutectoid is used as a solvent and cooperates with the metal oxide to modify the lignin; a hydrogen bond is formed by using urea and choline chloride in the eutectoid to controllably break C-C and C-O bonds and surface functional groups in a lignin structure to achieve an effect of fully dissolving the lignin, and then lattice oxygen formed in an M=O bond in the metal oxide is used to selectively oxidize the lignin, thereby efficiently catalyzing to remove a methoxy group on the surface of the lignin and the C-O bond in the broken lignin,which achieves the aims of reducing the spatial structural steric hindrance and increasing the surface hydroxyl content and can improve the reactivity of the lignin and epichlorohydrin.

Description

technical field [0001] The invention relates to a compound modification method, in particular to a lignin modification method and a lignin-based epoxy resin preparation method. Background technique [0002] Lignin is the only non-petroleum resource that can provide aryl compounds in nature. According to statistics, more than 50 million tons of lignin are produced annually from pulping black liquor and bioethanol fermentation, which is a renewable resource with great potential. Lignin is a three-dimensional network polymer structure formed by connecting phenylpropane structural units through C-C bonds and C-O bonds. Most lignin is insoluble in water. Its molecular structure contains a variety of active functional groups, and it is non-toxic and cheap. , have high utilization value. However, lignin has not been widely used so far due to its complex structure, heterogeneity of physical and chemical properties, and difficulty in separation and extraction. At present, there ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C08G59/06
CPCC08G59/063C08H6/00
Inventor 王一双陈明强孙琴琴张涵杨忠连汪春生汤志远王君陈明功
Owner ANHUI UNIV OF SCI & TECH
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