A method for preparing lignin-based adhesive by enzymatic modification

A lignin-based, adhesive technology, applied in the direction of lignin adhesives, adhesives, adhesive additives, etc., can solve the problems of high enzyme usage, limited mechanical strength, long hot pressing time, etc., and achieve improved modification degree, the effect of improving mechanical strength and water resistance

Active Publication Date: 2021-03-30
南宁雄晋生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing enzymatic modification to prepare lignin-based adhesives still has the defects of long hot pressing time, limited mechanical strength, limited modification efficiency and high enzyme usage.

Method used

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  • A method for preparing lignin-based adhesive by enzymatic modification

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix 50g alkali lignin with 10g compound enzyme, 5g vanillin, 2g 1-hydroxybenzotriazole, 10mL 0.28mM ABTS, 2g Triton X-100, then add acetic acid / sodium acetate buffer to adjust the pH of the reaction solution to 3.6 , and reacted for 3.5 hours at a temperature of 51°C to obtain a lignin-based adhesive prepared by enzymatic modification; alkali lignin was extracted from papermaking waste liquid. The compound enzyme is composed of 20% lignin peroxidase, 20% manganese peroxidase and 60% laccase, and the percentages are mass fractions.

[0024] The application of the aforementioned enzyme-modified lignin-based adhesive comprises the following steps:

[0025] (1) Evenly coating the enzymatically modified lignin-based adhesive on the surface of the veneer to form a plywood slab;

[0026] (2) The plywood slab is transferred to the hot press for hot pressing;

[0027] (3) Transfer the hot-pressed plywood into a cold press for cold pressing.

[0028] In step (1), the amount of...

Embodiment 2

[0030] Mix 55g alkali lignin with 12g compound enzyme, 5g vanillin, 2g 1-hydroxybenzotriazole, 10mL 0.28mM ABTS, 2g Triton X-100, then add acetic acid / sodium acetate buffer to adjust the pH of the reaction solution to 3.6 , and reacted for 3.3 hours at a temperature of 51 ° C to obtain a lignin-based adhesive prepared by enzymatic modification; alkali lignin was extracted from papermaking waste liquid. The compound enzyme is composed of 20% lignin peroxidase, 20% manganese peroxidase and 60% laccase, and the percentages are mass fractions.

[0031] The application of the aforementioned enzyme-modified lignin-based adhesive comprises the following steps:

[0032] (1) Evenly coating the enzymatically modified lignin-based adhesive on the surface of the veneer to form a plywood slab;

[0033] (2) hot pressing treatment;

[0034] (3) cold pressing treatment.

[0035] In step (1), the amount of glue applied to the enzymatically modified lignin-based adhesive is 0.07g / cm 2 ; Glu...

Embodiment 3

[0037] Mix 50g alkali lignin with 10g complex enzyme, 5g vanillin, 2g 1-hydroxybenzotriazole, 10mL 0.28mM ABTS, 2g Triton X-100, and then add acetic acid / sodium acetate buffer to adjust the pH of the reaction solution to 3.8 , and reacted for 3.5 hours at a temperature of 51°C to obtain a lignin-based adhesive prepared by enzymatic modification; alkali lignin was extracted from papermaking waste liquid. The compound enzyme is composed of 20% lignin peroxidase, 20% manganese peroxidase and 60% laccase, and the percentages are mass fractions.

[0038] The application of the aforementioned enzyme-modified lignin-based adhesive comprises the following steps:

[0039] (1) Evenly coating the enzymatically modified lignin-based adhesive on the surface of the veneer to form a plywood slab;

[0040] (2) hot pressing treatment;

[0041] (3) cold pressing treatment.

[0042] In step (1), the amount of glue applied to the enzymatically modified lignin-based adhesive is 0.06g / cm 2 ; Gl...

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Abstract

The invention relates to a method for preparing a lignin-based adhesive by enzymatic modification, which comprises the following steps: mixing alkali lignin with a compound enzyme, a mediator and a surfactant to obtain a reaction solution, and reacting for 3-3.5 hours under the conditions that the pH value is 3.5-3.8 and the temperature is 51-53 DEG C to obtain the lignin-based adhesive prepared by enzymatic modification, wherein the mediator is a mixture of ABTS, 1-hydroxybenzotriazole and vanillic aldehyde, the mass ratio of the alkali lignin to the compound enzyme is 10: (2-3) and the surfactant is Triton X-100. According to the method, the hot pressing time can be shortened, the mechanical strength is enhanced, the modification reaction efficiency is improved, and the enzyme consumption is reduced.

Description

technical field [0001] The invention relates to a method for preparing a lignin-based adhesive by enzymatic modification. Background technique [0002] Due to the relatively few active sites of lignin, it is difficult to prepare wood-based panels with good performance directly using lignin as an adhesive, and its mechanical properties often fail to meet the requirements of national standards, with low physical and mechanical properties. , Low water resistance. However, the existing enzymatic modification to prepare lignin-based adhesives still has the defects of long hot pressing time, limited mechanical strength, limited modification efficiency and high enzyme usage. Contents of the invention [0003] In order to overcome the above defects, the present invention provides a method for preparing lignin-based adhesives by enzymatic modification, which can reduce hot pressing time, enhance mechanical strength, improve modification reaction efficiency and reduce enzyme usage....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J197/00C09J11/06C08H7/00B27D1/08
CPCB27D1/08C08H6/00C09J11/06C09J197/005C08K5/3475C08K5/13
Inventor 玉小金吕薛飞李爱玲
Owner 南宁雄晋生物科技有限公司
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