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Plywood aldehyde-free soybean protein glue and preparation method thereof

A technology for soybean protein glue and plywood, which is used in the preparation of animal glue or gelatin, protein adhesives, adhesives, etc. Moderate, excellent water and corrosion resistance, uniform effect

Inactive Publication Date: 2019-06-21
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Soybean protein is a kind of formaldehyde-free green environmental protection adhesive. At present, the soybean protein adhesive prepared directly from soybean protein has the following disadvantages: (1) The role of chemical bonds such as hydrogen bonds and disulfide bonds in the protein molecule makes the protein The inside of the molecule is tightly linked together, and the viscosity of the adhesive is low; (2) the hydrophilic group in the protein molecule is exposed outside and the hydrophobic group is inside, making the water resistance of the adhesive poor; (3) soybean protein glue During the storage process, mildew will occur in 3 to 4 days, which will destroy the properties of soybean protein.
Due to its unsatisfactory related properties, the plywood obtained by pressing soybean protein glue faces problems such as water resistance of the glue line, bonding strength, and corruption during production and use, resulting in the production of plywood that does not meet the requirements of the national standard for plywood and cannot be put into practical application

Method used

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  • Plywood aldehyde-free soybean protein glue and preparation method thereof
  • Plywood aldehyde-free soybean protein glue and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The formula of formaldehyde-free soybean protein glue for plywood: 25 parts of soybean protein powder with particle size of 80 mesh, 200 parts of deionized water, 25 parts of sodium hydroxide solution with a mass concentration of 5%, 20 parts of polyamide polyamine epichlorohydrin resin PAE Crosslinker, 5 parts copper sulfate, pH 7.0.

[0022] The preparation method of plywood formaldehyde-free soybean protein glue, concrete steps are as follows:

[0023] (1) In a 500mL beaker, sequentially add 25 parts of soybean protein isolate powder with a particle size of 80 mesh, mix with 200 parts of deionized water, place in a water bath at 25°C, and stir at a constant speed of 1000r / min;

[0024] (2) Measure 25 parts of sodium hydroxide solution with a mass concentration of 5% and place it in the mixed solution obtained in step (1), and slowly heat up to 60° C. at a heating rate of 1° C. / min;

[0025] (3) Measure 20 parts of polyamide polyamine epichlorohydrin resin PAE crossl...

Embodiment 2

[0029] The formula of formaldehyde-free soybean protein glue for plywood: 25 parts of soybean protein powder with particle size of 80 mesh, 250 parts of deionized water, 35 parts of sodium hydroxide solution with a mass concentration of 5%, 25 parts of polyamide polyamine epichlorohydrin resin PAE Crosslinker, 10 parts copper sulfate, pH 7.0.

[0030] The preparation steps are the same as in Example 1.

[0031] Under this formula, the viscosity of soybean protein glue is 54s, the water absorption rate is 100%, and the storage period is 25 days; the dry bonding strength of birch plywood obtained by pressing soybean protein glue is 1.7 MPa, and the wet bonding strength is 0.98 MPa.

Embodiment 3

[0033] The formula of formaldehyde-free soybean protein glue for plywood: 25 parts of soybean protein powder with particle size of 80 mesh, 300 parts of deionized water, 30 parts of sodium hydroxide solution with a mass concentration of 5%, 20 parts of polyamide polyamine epichlorohydrin resin PAE Crosslinker, 5 parts sodium tetraborate, pH 7.0.

[0034] The preparation steps are the same as in Example 1.

[0035] Under this formula, the viscosity of soybean protein glue is 50s, the water absorption rate is 110%, and the storage period is 28 days; the dry state bonding strength of birch plywood obtained by pressing soybean protein glue is 1.6 MPa, and the wet state bonding strength is 0.82 MPa.

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Abstract

The invention discloses plywood aldehyde-free soybean protein glue and a preparation method thereof. The aldehyde-free soybean protein glue is prepared from following components: 25 parts of separatedsoybean protein powder, 200-300 parts of deionized water, 25-35 parts of 5% of a sodium hydroxide solution by mass, 20-25 parts of a PAE crosslinking agent for polyamide polyamine epichlorohydrin resin and 5-10 parts of a preservative. The aldehyde-free soybean protein glue is non-poisonous and harmless, low in cost and better in adhesive property. By pressing of the plywood with the aldehyde-free soybean protein glue, the adhesive property of obtained plywood can meet the national standard requirement.

Description

technical field [0001] The invention belongs to the technical field of adhesive preparation, and in particular relates to a formaldehyde-free soybean protein glue for plywood and a preparation method thereof. Background technique [0002] With the large demand for wood in the household industry, the wood-based panel industry has developed rapidly, and the demand for adhesives has also increased. The use of traditional trialdehyde glue, etc., not only causes serious pollution to the environment, but also continuously depletes non-renewable resources such as petroleum. Soy protein adhesive solves the disadvantages caused by trialdehyde glue, etc., and the soybean protein isolate used as raw material is abundant and low in price. At the same time, using soybean protein adhesive as the adhesive of plywood will also reduce the plywood Cost of production. [0003] Soybean protein is a kind of formaldehyde-free green environmental protection adhesive. At present, the soybean prot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J189/00C09J177/00C09J11/04B27D1/04B27D1/08B27G11/00
Inventor 吉建俞马宏
Owner NANJING UNIV OF SCI & TECH
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