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A kind of lignin/polyurethane/polyethyleneimine wood adhesive and preparation method thereof

A polyethyleneimine glue, polyethyleneimine technology, applied in the direction of adhesives, etc., to achieve high-value utilization, improve cohesive strength, and simple operation.

Active Publication Date: 2017-12-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no relevant literature report on the use of demethylated lignin to prepare lignin / polyurethane / polyethyleneimine wood adhesives.

Method used

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  • A kind of lignin/polyurethane/polyethyleneimine wood adhesive and preparation method thereof
  • A kind of lignin/polyurethane/polyethyleneimine wood adhesive and preparation method thereof
  • A kind of lignin/polyurethane/polyethyleneimine wood adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Synthesis of polyurethane prepolymer: In terms of mass fraction, add 30 parts of polyethylene glycol into the Erlenmeyer flask, stir evenly, heat up to 120°C and keep the vacuum degree of the reaction system above 0.09MPa, after dehydration for 3 hours, place Let the temperature drop to 60°C; then, add 13 parts of diphenylmethane diisocyanate dropwise, after the addition, let the reaction system react at a temperature of 75°C for 3 hours, and use the di-n-butylamine titration method to measure the ─N in the prepolymer. ═C═O mass content. When the actual measured value is close to the theoretical value, vacuum defoaming, sealed and preserved for subsequent use, the isocyanate group mass content of the hydrophilic polyurethane prepolymer is 4.5g / 100g;

[0036] Preparation of lignin / polyurethane / polyethyleneimine adhesive: In terms of mass fraction, add 15 parts of polyurethane prepolymer and 30 parts of tetrahydrofuran in the Erlenmeyer flask equipped with mechanical stir...

Embodiment 2

[0040] Synthesis of polyurethane prepolymer: In terms of mass fraction, add 40 parts of polyether polyol into the Erlenmeyer flask, stir evenly, heat up to 120°C and keep the vacuum degree of the reaction system above 0.09MPa, after dehydration for 3 hours, place Let the temperature drop to 60°C; then, add 15 parts of isophorone diisocyanate dropwise, after the addition, let the reaction system react at a temperature of 75°C for 3 hours, and use the di-n-butylamine titration method to measure the - The mass content of N═C═O. When the actual measured value is close to the theoretical value, vacuum defoaming, sealed and preserved for subsequent use, the isocyanate group mass content of the hydrophilic polyurethane prepolymer is 3.5g / 100g;

[0041] Preparation of lignin / polyurethane / polyethyleneimine adhesive: In terms of mass fraction, add 30 parts of polyurethane prepolymer and 50 parts of tetrahydrofuran in the Erlenmeyer flask equipped with mechanical stirring paddle, condens...

Embodiment 3

[0044] Synthesis of polyurethane prepolymer: In terms of mass fraction, add 40 parts of polyethylene glycol into the Erlenmeyer flask, stir evenly, heat up to 120°C and keep the vacuum degree of the reaction system above 0.09MPa, dehydrate for 3 hours, place Let the temperature drop to 60°C; then, add 18 parts of diphenylmethane diisocyanate dropwise, and after the addition, let the reaction system react at a temperature of 75°C for 3 hours, and use the di-n-butylamine titration method to measure the ─N in the prepolymer. ═C═O mass content. When the actual measured value is close to the theoretical value, vacuum defoaming, sealed and preserved for subsequent use, the isocyanate group mass content of the hydrophilic polyurethane prepolymer is 4.5g / 100g;

[0045] Preparation of lignin / polyurethane / polyethyleneimine adhesive: In terms of mass fraction, add 30 parts of polyurethane prepolymer and 50 parts of tetrahydrofuran in the Erlenmeyer flask equipped with mechanical stirring...

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Abstract

The invention discloses a lignin / polyurethane / polyethyleneimine wood adhesive and a preparation method thereof. Calculated by mass fraction, the raw material components of the wood adhesive are: 5-15 parts of polyisocyanate, 5-30 parts of polyester polyol or polyether polyol, 10-25 parts of lignin, 0.2-1 part of catalyst, poly 5-25 parts of ethyleneimine; during preparation, polyisocyanate is reacted with polyester polyol or polyether polyol to obtain polyurethane prepolymer; then lignin and polyethyleneimine are added successively to obtain a thermosetting wood adhesive. The invention adopts the lignin / polyurethane / polyethyleneimine adhesive prepared by demethylation modified lignin containing catechol structure, the raw material does not contain aldehydes, is green and environmentally friendly, and has high bonding strength and water resistance. it is good.

Description

technical field [0001] The invention relates to a wood adhesive, in particular to a preparation method of a lignin / polyurethane / polyethyleneimine wood adhesive. Background technique [0002] Lignin is the most abundant natural renewable resource next to cellulose, and it is also the only non-petroleum resource that can provide renewable aromatic compounds in nature. After lignin is demethylated and modified, a catechol structure is formed in the molecule, which is similar to the molecular structure of dopa (DOPA), the functional unit of mussel adhesion protein, which can improve the water resistance of the adhesive prepared from lignin. In addition, lignin is one of the main components of wood, and it has natural good biocompatibility with wood, which is beneficial to the bonding of wood. [0003] At present, there have been reports on lignin-formaldehyde-free adhesives, mainly including lignin / polyethyleneimine adhesives and lignin / polyurethane adhesives. Polyethyleneimin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J179/02C09J197/00C09J175/08
Inventor 李光吉梁露斯林殷雷王立莹易鹏
Owner SOUTH CHINA UNIV OF TECH