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A kind of all bio-based adhesive and its preparation method and application

An all-biological, glue-based technology, applied in the direction of adhesives, pectin adhesives, adhesive additives, etc., can solve the problems of low cross-linking properties, low board reuse value, poor reactivity, etc., and achieve low harmful gas release, The effect of increasing the value of reuse

Active Publication Date: 2020-11-06
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor reactivity between lignin and cellulose bio-based cross-linking agents and other substances, low cross-linking properties, and low reuse value of glued boards in the prior art, and to provide a bio-based cross-linking agent. Adhesive preparation method

Method used

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  • A kind of all bio-based adhesive and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A preparation method of a full bio-based adhesive, comprising:

[0040] Preparation of demethylated lignin: Demethylation of lignin

[0041] Preparation of demethylated nano-lignin: nano-processing demethylated lignin to obtain demethylated nano-lignin;

[0042] Preparation of oxidized nanocellulose: oxidize nanocellulose to obtain oxidized nanocellulose rich in aldehyde groups;

[0043] Preparation of full bio-based adhesive: demethylated nano-lignin suspension, oxidized nano-cellulose suspension and pectin (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., the mass content of galacturonic acid is 74%) to obtain by pre-crosslinking polymerization.

[0044] The specific pre-crosslinking polymerization reaction adopts 30% demethylated nano-lignin suspension, 50% oxidized nano-cellulose suspension and pectin, and mixes them according to the mass ratio of 0.5:1:0.05. , at a temperature of 60° C., the reaction was stirred at a speed of 100 rpm for 4 h.

[...

Embodiment 2

[0059] A preparation method of all bio-based adhesives, the difference from Example 1 is:

[0060] The specific pre-crosslinking polymerization reaction is carried out with a mass fraction of 30% demethylated nano-lignin suspension, a mass fraction of 60% oxidized nano-cellulose suspension and pectin, and the mass ratio is 0.5:1:0.1 in sequence. reaction.

[0061] Rotary evaporation in step S32 makes the solid content of the oxidized nanocellulose in the suspension liquid 60%; the others are the same as in Example 1.

Embodiment 3

[0063] A kind of preparation method of all bio-based adhesive, compared with embodiment 1, difference is:

[0064] The specific pre-crosslinking polymerization reaction is carried out with a mass fraction of 40% demethylated nano-lignin suspension, a mass fraction of 50% oxidized nano-cellulose suspension and pectin, according to the mass ratio of 0.5:1:0.1. reaction.

[0065] In step S24, vacuum rotary evaporation is performed on the suspension to make the solid content of the demethylated nano-lignin particles in the suspension to be 40%, and the others are the same as in Example 1.

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Abstract

The invention relates to the field of adhesives, in particular to a full-bio-based adhesive and a preparation method and application thereof. The method comprises the following steps: preparation of demethylated nano-lignin: carrying out nanocrystallization treatment on the demethylated nano-lignin; preparation of oxidized nanocellulose; and preparation of the full-bio-based adhesive: carrying outa pre-crosslinking polymerization reaction on the demethylated nano-lignin suspension, the oxidized nanocellulose suspension and pectin to obtain the full-bio-based adhesive. According to the full-bio-based adhesive and the preparation method thereof provided by the invention, lignin is subjected to demethylation and nanocrystallization treatment, and cellulose is also subjected to nanocrystallization and oxidation treatment. In this way, the reaction efficiency of covalent bonds generated between lignin and cellulose is remarkably improved, the crosslinking degree is improved, the adhesion to a plate is good, and the bonding strength is high. By full-bio-based preparation, the release amount of harmful gases of the obtained adhesive is low, and the reutilization value of the whole plywood is improved through the main components of lignin and cellulose plywood sheets.

Description

technical field [0001] The invention relates to the field of adhesives, in particular to an all-bio-based adhesive and its preparation method and application. Background technique [0002] With the rapid development of society and the continuous improvement of people's living standards, the demand for raw materials in industries such as home decoration continues to grow. However, due to the restrictions of forest protection policies and the long growth cycle and limited output of high-quality wood required for home decoration, high-quality wood-based panels have become the main raw materials for home decoration and other industries. Plywood is one of the most important boards in man-made boards. Usually, 1 ton of adhesive is required to produce 9 to 10 cubic meters of plywood. Traditional adhesives mainly include resin-based adhesives such as phenolic and urea-formaldehyde. Although these traditional adhesives have the advantages of easy sizing, fast drying, high bonding ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J101/04C09J197/00C09J105/06C09J11/08C08H7/00C08B15/02
CPCC08B15/02C08H6/00C09J11/08C09J101/04C08L97/005C08L5/06
Inventor 刘婧罗小林孙文昌程鑫陈礼辉黄六莲
Owner FUJIAN AGRI & FORESTRY UNIV
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