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, large amount of formaldehyde release, and harm to human health, and achieve environmental friendliness, simple preparation process, and high adhesive strength. And the effect of water resistance improvement

Inactive Publication Date: 2020-05-12
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] The present invention is a dual-modified soy-based wood adhesive, which contains the following components in mass percentages, each containing: 9% soy protein isolate, 0.3% sodium hydroxide, 0.001% tyrosinase, 3% urea, The balance is water.

[0020] The present invention is a method for preparing dual modified soy-based wood adhesive. Soy protein isolate and water are taken separately, soy protein isolate is dissolved in water, sodium hydroxide is taken to adjust the pH of the solution to 8, and then stirred at 50°C Soy protein solution is formed in 2h, then urea is added to dissolve for 10min, then tyrosinase is added, and stirred at 37℃ for 3h, at a pressure of 25MPa (3626psi), a volume of 100mL, and a temperature of 4℃. Get wood adhesive.

Embodiment 2

[0022] The present invention is a dual-modified soybean-based wood adhesive, which contains the following components by mass percentage, and each 100 grams contains: a mixture of 10% soy protein and whey protein in a mass ratio of 20:1, potassium hydroxide 0.4 %, laccase 0.004%, urea 5%, the balance is water.

[0023] The present invention is a method for preparing a dual-modified soy-based wood adhesive. A mixture of soy protein and whey protein in a mass ratio of 10:1 and water are respectively taken, and the soy protein and whey protein are in a mass ratio of 10:1. The constituted mixture was dissolved in water, and the pH value of the solution was adjusted with 0.4% potassium hydroxide by mass percentage, and then stirred at 50°C for 2h to form a soy protein solution. Then, urea was added to dissolve for 10 minutes, and then laccase was added at 37°C. After stirring for 3h, the pressure is 25MPa (3626psi), the volume is 100mL, and the temperature is 4℃. The wood adhesive is o...

Embodiment 3

[0025] The present invention is a dual-modified soybean-based wood adhesive, which contains the following components by mass percentage, and each 100 grams contains: a mixture of 12% soybean protein and millet gluten protein at a mass ratio of 10:1, calcium hydroxide 0.5%, peroxidase 0.005%, urea 12%, the balance is water.

[0026] The present invention is a method for preparing a dual modified soybean-based wood adhesive. The mixture of soybean protein and millet gluten protein is taken separately and water, the mixed protein is dissolved in water, and calcium hydroxide is taken to adjust the pH of the solution to 9.5. Stir at 50℃ for 2h to form a soy protein solution, then add urea to dissolve for 10min, then add peroxidase, 4℃ overnight, under the pressure of 25MPa (3626psi), volume of 100mL, temperature of 4℃, high pressure uniform 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 a pH value of the obtained solution to 7-11, andcarrying out stirring at 50 DEG C for 2 h to prepare a vegetable protein solution; adding urea and protease, and carrying out stirring for 3 hours at 37 DEG C or performing standing overnight at 4 DEG C; and performing high-pressure homogenization to obtain the wood adhesive. The enzyme-modified soybean-based wood adhesive provided by the invention only contains protein, low-concentration weak base and urea, so the problem of formaldehyde release is solved from the source; enzyme crosslinking enables the water resistance of the adhesive to be improved, and urea enables high-molecular-weight protein molecules obtained after enzyme crosslinking to be expanded, so a contact area between the adhesive and wood is increased, adhesive force is enhanced, and good shear strength is shown; the adhesive disclosed by the invention is environment-friendly and pollution-free in formula, and is reduced in the dependence on petrochemical raw materials.

Description

Technical field [0001] The invention belongs to the technical field of wood adhesives, and specifically relates to a double-modified soybean-based wood adhesive and a preparation method. Background technique [0002] At present, the most widely used adhesive in artificial boards is still "trialdehyde glue", namely urea-formaldehyde glue, phenolic glue and melamine-formaldehyde glue. However, wood products made with trialdehyde glue will release formaldehyde gas; every year According to news reports, the formaldehyde content in house decoration exceeds the standard, and the release period is as long as 5-15 years. It is a chemical substance that is toxic, carcinogenic, and teratogenic to the human body. In the list of carcinogens published by the World Health Organization's International Agency for Research on Cancer, formaldehyde is placed in the list of Class I carcinogens. [0003] In recent years, with the increasing competitive pressure in the international market, the ...

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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