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Aldehyde-free enzyme modified sugar-soybean-based composite wood adhesive and preparation method thereof

A wood adhesive and aldehyde-free technology, which is applied in the field of wood adhesives, can solve the problems of soybean protein cross-linking agents such as strong hazards, poor process applicability, and large formaldehyde release, so as to solve the problem of depletion, overcome poor water resistance, The effect of simple preparation process

Inactive Publication Date: 2020-05-29
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems that the current adhesives release a large amount of formaldehyde, endanger human health, high production cost, poor process applicability, uncompetitive products, and strong harmfulness of soybean protein cross-linking agents, the present invention provides an aldehyde-free modified sugar- Soybean-based composite wood adhesive and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] An aldolase-free modified sugar-soybean-based composite wood adhesive of the present invention comprises the following components in mass percentages, and every 100 grams contains: 9% soybean protein isolate, 0.3% sodium hydroxide, and 0.001% tyrosinase , urea 3%, glucosamine sulfate 0.4%, and the balance is water.

[0022] The preparation method of an aldolase-free modified sugar-soybean-based composite wood adhesive of the present invention comprises separately taking soybean protein isolate, glucosamine sulfate and water, dissolving the soybean protein isolate and glucosamine sulfate in water, and taking sodium hydroxide Adjust the pH value of the solution to 7, then stir at 50°C for 2h to form a vegetable protein solution, then add urea to dissolve for 10min, then add tyrosinase, stir at 37°C for 3h, under the pressure of 25MPa (3626psi), the volume is 100mL , The wood adhesive is obtained after high-pressure homogenization at a temperature of 4°C.

Embodiment 2

[0024] An aldolase-free modified sugar-soybean-based composite wood adhesive of the present invention comprises the following components in mass percentages, and every 100 grams contains: 10% soybean protein isolate, 0.6% potassium hydroxide, 0.004% laccase, and urea 5%, glucosamine hydrochloride 1.1%, and the balance is water.

[0025] The preparation method of an aldolase-free modified sugar-soybean-based composite wood adhesive of the present invention comprises separately taking soybean protein isolate, glucosamine hydrochloride and water, dissolving the soybean protein isolate and glucosamine hydrochloride in water, and taking potassium hydroxide Adjust the pH of the solution to 8, then stir at 50°C for 2 hours to form a soybean protein solution, then add laccase, stir overnight at 37°C, add urea to dissolve for 10 minutes, and then continue to add potassium hydroxide to adjust the pH to 11. 25MPa (3626psi), the volume is 100mL, and the wood adhesive is obtained after hig...

Embodiment 3

[0027] An aldolase-free modified sugar-soybean-based composite wood adhesive of the present invention comprises the following components in mass percentages, and every 100 grams contains: 12% soybean protein isolate and millet gluten protein with a mass ratio of 20:1 The mixture consists of calcium hydroxide 0.9%, peroxidase 0.005%, urea 12%, glucosamine sulfate 1.5%, and the balance is water.

[0028] The preparation method of an aldolase-free modified sugar-soybean-based composite wood adhesive of the present invention comprises respectively taking soybean protein, millet gluten protein, glucosamine sulfate and water, 12% soybean protein isolate and millet gluten protein Dissolve the mixture of mass ratio 20:1 and glucosamine sulfate in water, take calcium hydroxide to adjust the pH value of the solution to 8, then stir at 50°C for 2h to form a soybean protein solution, then add peroxidase, overnight at 4°C, Then add urea to dissolve for 10 minutes, and then continue to add ...

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Abstract

The invention belongs to the technical field of wood adhesives, and particularly relates to an aldehyde-free enzyme modified sugar-soybean-based composite wood adhesive and a preparation method thereof. The preparation method comprises the following steps: taking and dissolving a soybean protein or a protein mixture mainly comprising the soybean protein in water, adding glucosamine, adjusting thepH value of the obtained solution to 7-11 by using an alkaline hydroxide, and stirring at 50 DEG C for 2 h to prepare a soybean protein solution; adding urea and protease, and stirring overnight at 37DEG C; and performing high-pressure homogenization to obtain the wood adhesive. The formula of the modified sugar-soybean-based wood adhesive only contains the protein, glucosamine, urea and low-concentration weak alkali, so that the problem of formaldehyde release is solved from the source; and protease is crosslinked with soybean protein molecules to improve the water resistance of the adhesive, urea increases the contact area between macromolecules of the adhesive and a plate, glucosamine increases the adhesive force of the adhesive, and the adhesive is endowed with high adhesive force andwater resistance.

Description

technical field [0001] The invention belongs to the technical field of wood adhesives, and in particular relates to an aldolase-free modified sugar-soybean-based composite wood adhesive and a preparation method. Background technique [0002] With the depletion of wood resources, people are increasingly using wood-based panel furniture instead of solid wood furniture, so that the amount of adhesives is also increasing. From the original natural adhesives with poor water resistance, low solid content, low bonding strength, easy to mildew, and short storage period, they are gradually replaced by high bonding strength, short curing time, high concentration, low viscosity, easy to mix with water, simple process, and easy operation. Convenient "trialdehyde glue" replaced. However, the wood products made by using trialdehyde glue will release formaldehyde gas, which is very harmful to the human body. On October 27, 2017, in the list of carcinogens published by the International A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J189/00C09J11/04C09J11/06C09J11/08
CPCC08K2003/2206C08L2205/025C08L2205/03C09J11/04C09J11/06C09J11/08C09J189/00C08L89/00C08K3/22C08K5/17C08K5/21
Inventor 杨秀清
Owner SHANXI UNIV
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