A kind of preparation method of enzymatic hydrolysis of lignin-based phenolic resin

A technology for enzymatic hydrolysis of lignin and phenolic resin, applied in the field of preparation of phenolic resin, can solve the problems of low reactivity and low substitution rate of lignin, and achieve the effects of environmental safety, no pollution, increased reactivity and remarkable effect.

Active Publication Date: 2016-08-03
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
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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] Put 20.85g of phenol, 22.66g of activated modified enzymatic lignin, 16.65mL of formaldehyde solution, 2.78g of sodium hydroxide and 30mL of distilled water at 80°C for 1 hour; then add 16.65mL of formaldehyde solution, 2.78g of sodium hydroxide, continue 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

The preparation of the enzymatic lignin-based phenolic resin relates to a method of activating and modifying the enzymatic lignin, and then using the modified enzymatic lignin instead of phenol to synthesize the phenolic resin. The invention uses the fuel ethanol production residue of a pilot test base as a raw material, obtains refined enzymatic lignin through extraction, and replaces phenol to synthesize phenolic resin after activation and modification. The method has a high utilization rate of enzymatically decomposing lignin, the replacement rate of phenol reaches 60%, and the bonding strength performance of the phenolic resin still meets the national standard, and has broad application prospects.

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 Patents(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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