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Preparation method of enzymolysis lignin-based phenolic resin

A technology for enzymatically decomposing lignin and phenolic resin, applied in the field of phenolic resin preparation, can solve the problems of low lignin reactivity and low substitution rate, achieve environmental safety and pollution-free, increase reactivity, and simple activation modification process Effect

Active Publication Date: 2014-11-12
NORTHEAST FORESTRY UNIVERSITY
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AI Technical Summary

Problems solved by technology

[0005] The invention provides a preparation method of enzymatically decomposing lignin-based phenolic resin to solve the problems of low lignin reactivity and low substitution rate in the synthesis process of phenolic resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 20.85g phenol, 22.66g activated modified enzymatic lignin, 16.65mL formaldehyde solution, 2.78g sodium hydroxide and 30mL distilled water were reacted at 80°C for 1h; then 16.65mL formaldehyde solution and 2.78g sodium hydroxide were added, and continued to React at 80°C for 1 hour; add 16.65mL of formaldehyde solution, 2.78g of sodium hydroxide and react at 80°C for 1 hour, quickly cool the reaction system to 40°C, add 4mL of 5% sodium bisulfite solution, and stir to get the enzymatic lignin base Phenolic Resin. The substitution rate of enzymatic lignin to phenol in this product is 52%, the solid content of the adhesive is 47%, the free aldehyde content is 0.25%, and the bonding strength is 1.49MPa.

Embodiment 2

[0013] Put 20.22g of phenol, 38.89g of activated modified enzymatic lignin, 19.05mL of formaldehyde solution, 3.98g of sodium hydroxide and 45mL of distilled water at 80°C for 1 hour; then add 19.05mL of formaldehyde solution, 3.98g of sodium hydroxide, continue to React at 80°C for 1 hour; add 19.05mL of formaldehyde solution, 3.98g of sodium hydroxide and react at 80°C for 1 hour, quickly cool the reaction system to 40°C, add 7mL of 10% calcium bisulfite solution to get the enzymatically hydrolyzed lignin-based phenolic resin . The substitution rate of phenol by enzymatic lignin in this product is 66%, the solid content of the adhesive is 45%, the free aldehyde content is 0.26%, and the bonding strength is 1.38MPa.

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Abstract

Preparation of enzymolysis lignin-based phenolic resin relates to a method for carrying out activated modification on enzymolysis lignin so as to further synthesize phenolic resin by replacing phenol with the modified enzymolysis lignin. According to the method, pilot-base fuel ethanol production residue is used as a raw material; the pilot-base fuel ethanol production residue is extracted to obtain refined enzymolysis lignin; and after the refined enzymolysis lignin undergoes activated modification, phenol is replaced with the modified enzymolysis lignin to synthesize the phenolic resin. By the method, utilization rate of enzymolysis lignin is high; substitution rate of phenol reaches 60%; and bonding strength of the phenolic resin still can meet the national standard, and the phenolic resin has a wide application prospect.

Description

technical field [0001] The invention relates to the preparation of a phenolic resin using enzymatically decomposed lignin in cellulose ethanol production residue as the main raw material. Background technique [0002] Phenolic resin is widely used in the wood industry due to its excellent performance, but with the increasing shortage of petroleum resources and the rising price of petroleum-based chemical raw materials, the large-scale production and application of phenolic resin adhesives for wood-based panels are increasingly restricted. Since lignin is a natural phenolic substance with the properties of phenol, lignin can be used to replace toxic and expensive phenol. Carrying out research on lignin-modified phenolic resin (LPF) adhesives is of great significance in terms of environmental protection and economic benefits, and it is also the development trend of phenolic resins. [0003] Many studies have been done on the modification of lignin at home and abroad. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28
Inventor 李淑君李新生王哲东徐超曲方玉
Owner NORTHEAST FORESTRY UNIVERSITY
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