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Modified soybean-based emulsion adhesive and preparation method thereof

An emulsion glue, soybean technology, applied in the direction of adhesives, adhesive types, graft polymer adhesives, etc., can solve the problem of high styrene content in adhesives, endangering the health of users, and lack of residual monomer treatment steps and other problems, to achieve the effect of high bonding strength, high production efficiency, and shortening the pre-processing time.

Inactive Publication Date: 2015-06-10
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Invention patent ZL 200910024577.5 discloses "monomer copolymerization modified soybean protein adhesive". After the soybean protein is denatured by sodium dodecylbenzenesulfonate, it is grafted with maleic anhydride, and ammonium persulfate is used as the initiator. Copolymerized with styrene to finally synthesize a copolymerized modified soybean protein adhesive. Although the bonding and water resistance of the patented adhesive have been improved, and the stability has also been improved, the preparation method of the adhesive lacks the ability of residual monomers. The processing steps will easily lead to high styrene content in the adhesive, which will endanger the health of users

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A modified soybean-based emulsion adhesive, the specific steps of its preparation method are as follows:

[0031] 1) Enzymatic modification: Add 80 parts of distilled water and 20 parts of 300-mesh defatted soybean flour into a reaction kettle with a vacuum condensing device, control the speed of the agitator at 80 rpm, and keep stirring at 30°C for 50 minutes , add 0.5 parts of hydrochloric acid solution with a mass fraction of 30%, keep warm and stir for 10 minutes, heat up to 50°C, then add 0.25 parts of hemicellulose enzyme, and react for 30 minutes;

[0032] 2) Grafting: continue to heat up to 70°C, add 3 parts of N-methylolacrylamide, graft for 50 minutes, then add 4 parts of polyvinyl alcohol 2099, and stir until there are no obvious particles;

[0033] 3) Polymerization: adjust pH=4.2 with 45% citric acid solution, add 2 parts of styrene, stir for 5 minutes, add 0.5 parts of 5% ammonium persulfate solution, stir for 20 minutes, continue to drop 18 parts of styr...

Embodiment 2

[0037] A modified soybean-based emulsion adhesive, the specific steps of its preparation method are as follows:

[0038] 1) Enzymatic modification: Add 200 parts of distilled water and 50 parts of 250-mesh defatted soybean flour into a reaction kettle with a vacuum condensing device, control the speed of the agitator at 100 rpm, and keep stirring at 20°C for 60 minutes , add 0.8 parts of hydrobromic acid solution with a mass fraction of 30%, keep warm and stir for 15 minutes, heat up to 40°C, then add 2.5 parts of hemicellulose enzyme, and react for 50 minutes;

[0039] 2) Grafting: continue to heat up to 80°C, add 5 parts of N-methylolacrylamide, graft for 20 minutes, then add 12 parts of polyvinyl alcohol 1788, and stir until there are no obvious particles;

[0040]3) Polymerization: adjust pH=4.0 with 38% acetic acid solution, add 4 parts of acrylic acid, stir for 5 minutes, add 2 parts of 2% potassium persulfate solution, stir for 25 minutes, continue to drop 36 parts Acr...

Embodiment 3

[0044] A modified soybean-based emulsion adhesive, the specific steps of its preparation method are as follows:

[0045] 1) Enzymatic modification: Add 120 parts of boiler condensed water and 40 parts of 100-mesh defatted soybean flour to a reaction kettle with a vacuum condensing device, control the speed of the agitator to 90 rpm, and keep stirring at 35°C For 40 minutes, add 0.8 parts of acetic acid solution with a mass fraction of 35%, keep stirring for 15 minutes, heat up to 60°C, then add 1.6 parts of cellulase, and react for 15 minutes;

[0046] 2) Grafting: continue to heat up to 70°C, add 4.2 parts of N-methylolacrylamide, graft for 50 minutes, then add 6 parts of polyvinyl alcohol 2488, and stir until there are no obvious particles;

[0047] 3) Polymerization: adjust pH=5.0 with 30% hydrochloric acid solution, add 4 parts of butyl acrylate, stir for 10 minutes, add 1.5 parts of 3% ammonium persulfate solution, stir for 20 minutes, continue to drop 36 parts of butyl ...

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Abstract

The invention discloses a modified soybean-based emulsion adhesive and a preparation method thereof. The modified soybean-based emulsion adhesive takes 20-50 parts of degreased soya flour, 75-200 parts of water, 0.3-1.2 parts of acid solution, 0.25-2.50 parts of biological enzyme, 3-5 parts of N-hydroxymethyl acrylamide, 4-12 parts of polyvinyl alcohol, 20.0-60.0 parts of polymer monomer, and 2.0-8.0 parts of initiator as raw materials, and is prepared through steps of enzymolysis modification, graft polymerization, vacuum treatment, and re-adjustment of pH. The modified soybean-based emulsion adhesive does not release formaldehyde, has good environment protection performance and high bonding strength, can be solidified at room temperature or solidified by heating, and is applicable to industries such as wood processing, building, packaging and textile.

Description

technical field [0001] The invention belongs to the technical field of emulsion adhesive preparation, relates to a biomass-based material, in particular to a modified soybean-based emulsion adhesive with good environmental performance and a preparation method thereof. Background technique [0002] Adhesives have a long history of application in the process of human civilization, and the early ones used were all natural adhesives. In the 1920s, the development of synthetic polymer chemistry and industry led to the emergence of various synthetic resin adhesives with excellent performance, which gradually replaced natural adhesives and became the main body of the market. However, synthetic resin adhesives often use toxic petroleum derivatives (such as phenol, formaldehyde, active monomers, etc.) . Therefore, with the improvement of human awareness of environmental protection and sustainable development, natural adhesives based on renewable resources have regained people's att...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J151/00C08F289/00C08F220/58
Inventor 林巧佳陈奶荣饶久平曾钦志
Owner FUJIAN AGRI & FORESTRY UNIV
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