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Modified lignin-based adhesive and preparation method thereof

A technology of lignin-based and plain-based adhesives, applied in the directions of lignin adhesives, adhesives, adhesive types, etc., can solve the problem of insufficient adhesive strength, and achieve high adhesive strength, increase cohesion, and high adhesiveness. the effect of strength

Inactive Publication Date: 2021-09-10
深圳市洪欣巨供应链有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a modified lignin-based adhesive and its preparation method, which solves the technical problem of insufficient adhesive strength of traditional lignin-based adhesives

Method used

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  • Modified lignin-based adhesive and preparation method thereof
  • Modified lignin-based adhesive and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] A preparation method of a modified lignin-based adhesive, comprising the steps of:

[0028] (1) Preparation of melamine-modified lignin: 20g of alkali lignin was added to 200mL of tetrahydrofuran solvent, and then 16g of melamine, 12g of 3-isopropenylbenzaldehyde and 4g of catalyst NaCl / H 2 o 2 , stirred and refluxed at 70°C for 3 hours, and after the reaction was completed, the reaction product was filtered, washed and dried to obtain melamine-modified lignin;

[0029] (2) Prepare modified lignin: add 20g melamine modified lignin to 200g, 10wt% AgNO 3 In the solution, perform shock adsorption for 2 hours, and after the adsorption is completed, the modified lignin is obtained;

[0030] (3) Preparation of oxidized polyvinyl alcohol: Disperse 20g of polyvinyl alcohol in 100mL of deionized water under stirring. After the dispersion is uniform, heat up to 80°C, stir and dissolve, and then add 2.5g of oxidizing agent potassium persulfide to it for 40min to oxidize. Obtain...

Embodiment 2

[0033] A preparation method of a modified lignin-based adhesive, comprising the steps of:

[0034] (1) Preparation of melamine-modified lignin: 20g of alkali lignin was added to 200mL of tetrahydrofuran solvent, and then 18g of melamine, 14g of 3-isopropenylbenzaldehyde and 5g of catalyst NaCl / H 2 o 2 , stirred and refluxed at 80°C for 3 hours, and after the reaction was completed, the reaction product was filtered, washed and dried to obtain melamine-modified lignin;

[0035] (2) Prepare modified lignin: 25g melamine modified lignin is added to 250g, 10wt% AgNO 3 In the solution, perform shock adsorption for 2 hours, and after the adsorption is completed, the modified lignin is obtained;

[0036] (3) Preparation of oxidized polyvinyl alcohol: disperse 20 g of polyvinyl alcohol in 100 mL of deionized water under stirring, after the dispersion is uniform, heat up to 80 ° C, stir and dissolve, and then add 1 g of oxidant potassium persulfide to it and oxidize for 40 min to obt...

Embodiment 3

[0039] A preparation method of a modified lignin-based adhesive, comprising the steps of:

[0040] (1) Preparation of melamine-modified lignin: 20g of alkali lignin was added to 200mL of THF solvent, and then 20g of melamine, 15g of 3-isopropenylbenzaldehyde and 6g of catalyst NaCl / H 2 o 2 , stirred and refluxed at 80°C for 3 hours, and after the reaction was completed, the reaction product was filtered, washed and dried to obtain melamine-modified lignin;

[0041] (2) Prepare modified lignin: 25g melamine modified lignin is added to 260g, 10wt% AgNO 3 In the solution, perform shock adsorption for 2 hours, and after the adsorption is completed, the modified lignin is obtained;

[0042] (3) Preparation of oxidized polyvinyl alcohol: disperse 20g of polyvinyl alcohol in 100mL of deionized water under stirring, after the dispersion is uniform, heat up to 80°C, stir and dissolve, then add 2g of oxidant potassium persulfide to it and oxidize for 40min to obtain Oxidized polyviny...

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Abstract

The invention discloses a modified lignin-based adhesive and a preparation method thereof, an amino group of melamine and an active carbonyl group of 3-isopropenylbenzaldehyde are subjected to a Schiff base reaction to generate an intermediate product, and the intermediate product and alkali lignin can be well polymerized to obtain melamine modified lignin. The specific process is as follows: 3-isopropenylbenzaldehyde reacts with melamine to obtain a 3-isopropenylbenzaldehyde modified melamine intermediate product, and then amino in the intermediate product reacts with phenolic hydroxyl of lignin to form a high-molecular polymer with a compact network structure, and double bonds in the 3-isopropenylbenzaldehyde modified melamine and carbon-based conjugated double bonds in the lignin react and are polymerized together so that the formaldehyde-free lignin adhesive has higher adhesive strength, and amino groups in the melamine modified lignin are complexed with silver ions and thus the overall cohesive force of the adhesive is increased, and the adhesive with more stable structure and higher adhesive strength is formed.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a modified lignin-based adhesive and a preparation method thereof. Background technique [0002] Lignin is a renewable biomass resource with low price and huge output. There are unsubstituted active hydrogen on the benzene ring structure of lignin, active functional groups such as phenolic hydroxyl group on the benzene ring, and alcoholic hydroxyl group on the side chain, so it has high Its reactivity can undergo methylolation and polycondensation reactions with aldehyde groups, and it becomes the basis for the preparation of various materials. [0003] Patent document CN201811117318 discloses a lignin-based formaldehyde-free adhesive and its preparation method. The lignin-based formaldehyde-free adhesive is not synthesized from formaldehyde, which greatly reduces the formaldehyde of wood-based panels pressed by adhesives. The amount released is beneficial to the environment a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J197/00C09J129/04C08H7/00
CPCC09J197/005C09J129/04C08H6/00C08L29/04C08L97/005
Inventor 蔡葵衍车成凯陈丹红陈树杰
Owner 深圳市洪欣巨供应链有限公司