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Pressure-responsive room-temperature cured wood adhesive and preparation method thereof

A wood adhesive, room temperature curing technology, used in the preparation of animal glue or gelatin, adhesives, adhesive additives, etc. Convenient application, obvious effect of energy saving and consumption reduction, the effect of prolonging the storage time

Active Publication Date: 2020-11-13
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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Abstract

The invention discloses a pressure-responsive room-temperature cured wood adhesive and a preparation method thereof. Biomass containing vegetable protein is used as a raw material; the preparation method comprises the following steps: carrying out acid treatment, filtering, separating to respectively obtain two parts of substances containing vegetable protein and soluble polysaccharide, mixing thesubstance containing soluble polysaccharide with a cross-linking agent and a chain extender, reacting to prepare microcapsules, and mixing the microcapsules with the substance containing vegetable protein to prepare the pressure-responsive room-temperature cured wood adhesive. Under the action of external pressure, the microcapsules in the adhesive are broken so that the contained components arereleased and cross-linked and cured with the vegetable protein-containing part to realize bonding, and the adhesive has the advantages of no formaldehyde release, long working life, no need of high-temperature conditions, convenience in application and good market popularization prospect.

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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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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