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Dual-modified soybean-based wood adhesive and preparation method thereof

A technology of double modification of wood adhesives, applied in the field of wood adhesives, can solve the problems of high hazards of crosslinking agents, poor process applicability, and harm to human health, and achieve environmental friendliness, improved adhesive strength and water resistance, good stability effect

Inactive Publication Date: 2020-11-06
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, and have high production costs, poor process applicability, uncompetitive products, and the use of cross-linking agents is highly harmful, the present invention provides a double modified soybean-based wood adhesive. Agent and preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A double-modified soybean-based wood adhesive of the present invention comprises the following components in mass percentage, and every 100 grams contains: soybean protein isolate 9%, sodium hydroxide 0.3%, tyrosinase 0.001%, urea 3%, The balance is water.

[0020] The preparation method of a double-modified soybean-based wood adhesive of the present invention comprises separately taking soybean protein isolate and water, dissolving the soybean protein isolate in water, taking sodium hydroxide to adjust the pH value of the solution to 8, and then stirring at 50°C After 2 hours to form a soybean protein solution, add urea to dissolve it for 10 minutes, then add tyrosinase, stir at 37°C for 3 hours, and then homogenize under high pressure at a pressure of 25MPa (3626psi), a volume of 100mL, and a temperature of 4°C. Get wood glue.

Embodiment 2

[0022] A double-modified soybean-based wood adhesive of the present invention comprises the following components in mass percentages, and every 100 grams contains: a mixture of 10% soybean protein and whey protein at a mass ratio of 20:1, potassium hydroxide 0.4 %, laccase 0.004%, urea 5%, and the balance is water.

[0023] The preparation method of a kind of double modified soybean-based wood adhesive of the present invention, respectively take the mixture and water that soybean protein and whey protein constitute with the mass ratio of 10:1, mix soybean protein and whey protein with the mass ratio of 10:1 Dissolve the formed mixture in water, take 0.4% potassium hydroxide by mass to adjust the pH of the solution to 9, then stir at 50°C for 2 hours to form a soybean protein solution, then add urea to dissolve it for 10 minutes, then add laccase, and heat at 37°C Stir under high pressure for 3 hours, and obtain wood adhesive after high-pressure homogenization under the conditi...

Embodiment 3

[0025] A double-modified soybean-based wood adhesive of the present invention comprises the following components in mass percentages, and every 100 grams contains: a mixture of 12% soybean protein and millet gluten protein in a mass ratio of 10:1, calcium hydroxide 0.5%, peroxidase 0.005%, urea 12%, and the balance is water.

[0026] The preparation method of a kind of double modified soybean-based wood adhesive of the present invention, respectively take the mixture of soybean protein and millet gluten protein and water, dissolve the mixed protein in water, take calcium hydroxide to adjust the pH value of the solution to 9.5, and then Stir at 50°C for 2 hours to form a soybean protein solution, then add urea to dissolve it for 10 minutes, then add peroxidase, overnight at 4°C, under the conditions of pressure of 25MPa (3626psi), volume of 100mL, and temperature of 4°C, high-pressure homogenization After quality, the wood adhesive is obtained.

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Abstract

The invention belongs to the technical field of wood adhesives, and particularly relates to a dual-modified soybean-based wood adhesive and a preparation method thereof. The preparation method comprises the following steps: dissolving soybean protein or a protein mixture mainly comprising soybean protein in water, adding alkaline hydroxide to adjust the pH value of the solution to 7-11, and stirring at 50 DEG C for 2 h to prepare a vegetable protein solution; adding urea and protease, and stirring for 3 hours at 37 DEG C or staying overnight at 4 DEG C; and performing high-pressure homogenization to obtain the wood adhesive. According to the invention, the enzyme-modified soybean-based wood adhesive provided by the invention only contains protein, low-concentration weak base and urea, so that the problem of formaldehyde release is solved from the source; enzyme cross-linking enables the water resistance of the adhesive to be improved, urea enables high-molecular-weight protein molecules obtained after enzyme cross-linking to be expanded, the contact area between the adhesive and wood is increased, the adhesive force is enhanced, and good shear strength is shown; and the adhesive disclosed by the invention is environment-friendly and pollution-free in formula, and the dependence on petrochemical raw materials is reduced.

Description

technical field [0001] The invention belongs to the technical field of wood adhesives, and in particular relates to a double-modified soybean-based wood adhesive and a preparation method. Background technique [0002] At present, the most widely used adhesive in wood-based panels is still "trialdehyde glue", that is, urea-formaldehyde glue, phenolic glue and melamine-formaldehyde glue. However, wood products made with three-aldehyde glue will release formaldehyde gas; According to news reports, because the content of formaldehyde in house decoration exceeds the standard, the release period is as long as 5-15 years. It is a chemical substance that is poisonous, carcinogenic, and teratogenic to the human body. In the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization, formaldehyde is placed in the list of first-class carcinogens. [0003] In recent years, with the increasing pressure of competition in the internat...

Claims

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Application Information

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