Soybean-based protein adhesive and preparation method thereof

An adhesive and protein glue technology, applied in the preparation of protein adhesives, animal glue or gelatin, adhesives, etc., can solve the problems of limited market promotion, low bonding strength, high moisture content, and achieve cost reduction and bonding strength. High, saving drying energy consumption effect

Active Publication Date: 2018-09-25
北京盛大华源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the soybean adhesives made by researchers at home and abroad generally have the problems of poor water resistance, low bonding strength, high viscosity, low soybean protein content, and high moisture content, which increases the energy consumption of wood-based panels (moisture drying), increases The production cost of wood-based panels reduces the utilization rate of soybean protein. These factors bring great difficulties to the industrial production and application of soybean protein adhesives and limit its market promotion.

Method used

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  • Soybean-based protein adhesive and preparation method thereof

Examples

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preparation example Construction

[0030] In the second aspect, the preparation method of soy-based protein adhesive comprises the following steps:

[0031] 1) Take soybean meal, alkali, urea, crosslinking agent and water by weight;

[0032] 2) After dispersing the alkali and urea in water, add soybean meal under stirring condition, stir and reflux reaction, and obtain soybean meal degradation liquid;

[0033] 3) Adding a cross-linking agent to the soybean meal degradation liquid, copolymerizing, and cooling to obtain a soybean-based protein adhesive.

[0034] Specifically, the soybean meal is added under stirring conditions, the stirring condition is mechanical stirring, and the rotation speed is 600-1800 rpm, for example, it can be 600 rpm, 800 rpm, 1000 rpm, 1200 rpm, 1400 rpm RPM, 1600 RPM, 1800 RPM. Under this stirring condition, the dissolution of the soybean meal can be accelerated, the soybean protein in the soybean meal can be hydrolyzed under alkaline conditions, the globular structure of the protei...

Embodiment 1

[0041] This embodiment provides a soy-based protein adhesive, which is prepared by the following method:

[0042]1) Disperse 9 parts of sodium hydroxide and 15 parts of urea in 200 parts of water, add 100 parts of defatted soybean meal (with a particle size of 50 mesh) under the stirring condition of 1000 rpm, heat up to 65°C, stir and reflux for 3 hour, obtain the soybean meal degradation solution;

[0043] 2) Add 20 parts of glutaraldehyde to the soybean meal degradation solution, keep it at 75°C for 0.5 hours, and cool to room temperature to obtain a soybean-based protein adhesive.

[0044] After testing, the obtained soy-based protein adhesive has a viscosity of 1250 mPa.s and a solid content of 41.2%.

[0045] It is used for the pressing of three-layer poplar plywood, and the type II bonding strength test is carried out, and the measured bonding strength is 0.82Mpa.

Embodiment 2

[0047] This embodiment provides a soy-based protein adhesive, which is prepared by the following method:

[0048] 1) Disperse 5 parts of sodium hydroxide, 4 parts of potassium hydroxide and 20 parts of urea in 200 parts of water, add 100 parts of defatted soybean meal (with a particle size of 400 mesh) at a stirring speed of 600 rpm, and heat up to 95°C, stirred and refluxed for 2 hours to obtain soybean meal degradation liquid;

[0049] 2) Add 50 parts of polyamide polyamine epichlorohydrin to the soybean meal degradation liquid, keep at 85°C for 50 minutes, cool to room temperature, and discharge to obtain soybean-based protein adhesive.

[0050] After testing, the obtained soy-based protein adhesive has a viscosity of 1960 mPa.s and a solid content of 46.8%.

[0051] It is used for the pressing of three-layer poplar plywood, and the type II bonding strength test is carried out, and the measured bonding strength is 1.44Mpa.

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Abstract

The invention discloses a soybean-based protein adhesive and a preparation method thereof. The invention first discloses the soybean-based protein adhesive which is prepared from the following raw materials in parts by weight: 50 to 100 parts of soybean meal, 5 to 15 parts of alkali, 5 to 30 parts of urea, 20 to 100 parts of cross-linking agent and 50 to 300 parts of water. The invention further discloses the preparation method for the soybean-based protein adhesive. Since defatted soybean meal sold in the market is adopted as the main raw material of the soybean-based protein adhesive disclosed by the invention, the cost is far lower than the cost of soybean protein isolate. Because the content of soybean-based protein solid in the soybean-based protein adhesive is high, reaching 40 to 55percent, the energy consumption of drying in the process of artificial board production can be reduced, and cost can be reduced. Moreover, the viscosity of the soybean-based protein adhesive disclosed by the invention is controllable, the bonding strength is high, and the soybean-based protein adhesive can be used in the production of artificial boards, such as plywoods, shaving boards, medium density fiberboards and blockboards.

Description

technical field [0001] The invention relates to the technical field of adhesives. More specifically, it relates to a soy-based protein adhesive and a preparation method thereof. Background technique [0002] Most of the adhesives used in the wood industry are synthetic resin adhesives that release formaldehyde. The formaldehyde and volatile organic compounds produced during the use of such wood products will seriously endanger the physical and mental health of industrial workers and consumers. [0003] In order to solve the problems and hazards of the existing adhesives used in the wood industry, it is of great significance to develop green and environmentally friendly formaldehyde-free adhesives. Biomass soybean protein adhesives for wood processing are renewable resources, formaldehyde-free and environmentally friendly adhesives. Its raw material is soybean meal, which is based on the residues of the oil industry. of favor. [0004] However, the soybean adhesives made b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J189/00C09J11/06C09J11/08
CPCC09J11/06C09J11/08C09J189/00C08K5/21C08K5/06
Inventor 罗文圣翟玉龙
Owner 北京盛大华源科技有限公司
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