A pressure-responsive room temperature curing wood adhesive and preparation method thereof

A wood adhesive, room temperature curing technology, applied in the preparation of animal glue or gelatin, adhesives, adhesive additives, etc., can solve the problems of low solid content of adhesives, unfavorable industrialization promotion, long aging time, etc., to achieve Easy application, obvious effect of energy saving and consumption reduction, prolonging the effect of storage time

Active Publication Date: 2021-06-29
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adhesives prepared by the above two methods need to be cured at a relatively high temperature (100°C), and the solid content of the adhesive is low, and it needs to be aged for a long time after coating, which is not conducive to industrialization.
Invention patent (ZL201310660492.2) announced a room temperature curing weather-resistant vegetable protein adhesive made of vegetable protein powder and various monomers through enzymolysis, graft copolymerization, and vacuum treatment. Great features, but difficult to apply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Mix and stir 84.5g toluene diisocyanate and 17g ethyl acetate at room temperature for 30 minutes to obtain a crosslinking agent solution for use;

[0028] 2) Mix 30g cottonseed meal with 360g deionized water, stir at room temperature at a speed of 120rpm for 20min, then add citric acid to adjust the pH to 4.2, and then continue stirring at room temperature at a speed of 30rpm for 30min;

[0029] 3) At room temperature, filter the feed liquid obtained in step 2) with 200-mesh gauze, and separate it into filter residue and filtrate;

[0030] 4) Use sodium hydroxide to adjust the pH of the filtrate to 6.5-7.5, then add the crosslinking agent solution prepared in step 1), and raise the temperature to 50°C, then add 13.5g of 1,4-butanediol, and stir 1.0h, then cooled to room temperature, washed and dried to obtain microcapsules;

[0031] 5) The filter residue obtained in step 3) is mixed with the microcapsules obtained in step 4), and a small amount of water is added to ...

Embodiment 2

[0034] 1) Mix and stir 120g of diphenylmethane diisocyanate and 21g of ethanol at room temperature for 30min to obtain a crosslinking agent solution for use;

[0035] 2) Mix 50g rapeseed meal with 400g deionized water, stir at room temperature at 120rpm for 20min, then add hydrochloric acid to adjust the pH to 4.5, then continue stirring at room temperature at 30rpm for 30min;

[0036] 3) At room temperature, filter the feed liquid obtained in step 2) with 400-mesh gauze, and separate it into filter residue and filtrate;

[0037] 4) Use potassium hydroxide to adjust the pH of the filtrate to 6.5-7.5, then add the crosslinking agent solution prepared in step 1), and raise the temperature to 50°C, then add 18g of 1,4-butanediol, and stir for 1.2 h, then cooled to room temperature, washed and dried to obtain microcapsules;

[0038] 5) The filter residue obtained in step 3) is mixed with the microcapsules obtained in step 4), and a small amount of water is added to adjust the pH ...

Embodiment 3

[0041] 1) Mix and stir 170g of toluene diisocyanate and 35g of acetone at room temperature for 30 minutes to obtain a crosslinking agent solution for use;

[0042] 2) Mix 80g soybean powder with 700g deionized water, stir at room temperature at 120rpm for 20min, then add acetic acid to adjust the pH to 4.8, then continue stirring at room temperature at 30rpm for 30min;

[0043] 3) At room temperature, filter the feed liquid obtained in step 2) with 300-mesh gauze, and separate it into filter residue and filtrate;

[0044] 4) Adjust the pH of the filtrate to 6.5-7.5 with ammonia water, then add the crosslinking agent solution prepared in step 1), and raise the temperature to 50°C, then add 28g of 1,4-butanediol, and stir for 1.5h. Then cool to room temperature, wash and dry to obtain microcapsules;

[0045] 5) The filter residue obtained in step 3) is mixed with the microcapsules obtained in step 4), and a small amount of water is added to adjust the pH to 7.0 to obtain the pr...

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PUM

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Abstract

The invention discloses a pressure-responsive room-temperature-curing wood adhesive and a preparation method thereof. It uses biomass containing vegetable protein as a raw material, and is filtered and separated after acid treatment to obtain two kinds of adhesives containing vegetable protein and soluble polysaccharide respectively. Part of the material, then mix the material containing soluble polysaccharide with cross-linking agent and chain extender to make microcapsules, and then mix the obtained microcapsules with the material containing vegetable protein to obtain the pressure-responsive room temperature curing wood glue adhesive. Under the action of external pressure, the microcapsules in the adhesive are broken, and the ingredients contained in it are released to cross-link and solidify with the part containing vegetable protein, so as to realize bonding. It has no formaldehyde release, long application period, and It does not require high temperature conditions, is convenient to apply, and has good market promotion prospects.

Description

technical field [0001] The invention belongs to the technical field of adhesive preparation, and in particular relates to a pressure-responsive room temperature curing wood adhesive and a preparation method thereof. Background technique [0002] As people pay more and more attention to environmental protection and sustainable resource utilization, biomass adhesives that are environmentally friendly and have renewable raw materials have attracted widespread attention. Biomass raw materials containing plant protein components have become the preferred raw materials for the preparation of biomass adhesives due to their many functional groups, high activity, and low cost. However, the water resistance of adhesives prepared directly from biomass raw materials is poor, and it is difficult to meet the requirements of industrial applications. Therefore, many scholars use various methods to modify them to improve their performance. For example, the invention patent (CN 102977844 A) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J189/00C09J11/06C09J11/08
CPCC09J11/06C09J11/08C09J189/00C08L5/00C08K9/10C08K5/053C08K5/29
Inventor 陈奶荣殷豪张二兵朱志强赵建良赵丹丹伍秋萍林巧佳饶久平曾钦志
Owner FUJIAN AGRI & FORESTRY UNIV
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