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A kind of crosslinking modified soybean protein adhesive

A soybean protein, cross-linking modification technology, applied in the direction of protein adhesives, adhesives, adhesive types, etc., can solve the problems of poor operability, long preparation time of adhesives, complicated production process, etc., to ensure reliable Operability, conducive to industrial promotion and application, and the effect of mature preparation technology

Active Publication Date: 2017-04-05
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN 200610047507.8 adds isocyanate as a crosslinking agent on the basis of graft copolymerization modified soybean protein adhesive, but in general, the method of preparing soybean protein adhesive by graft copolymerization modification method has complicated production process and the preparation time of adhesive is too long Long, practical operability is not strong

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Add 80 parts of defatted soy flour, 187 parts of water, 0.8 parts of sodium dodecylbenzenesulfonate, 4.8 parts of NaOH into the reactor, start the mechanical stirring bar, stir for 5 minutes, then add 1.6 parts of ethylene glycol, Add 10 drops of silicone oil, heat up to 90°C, and keep the reaction time for 3 hours, then discharge after cooling to obtain soybean protein adhesive.

[0020] (2) Add 150 parts of 37% formaldehyde solution to the reaction kettle, and adjust the pH to 9.0 with an appropriate amount of 30% NaOH solution. Add 80 parts of melamine, raise the temperature to 85°C, keep it warm for 1-2 hours, then immediately cool to 40°C, adjust the pH to 9.0 with NaOH solution and discharge to obtain melamine resin.

[0021] (3) Add 2 parts of epoxy resin and 8 parts of melamine resin to the soybean protein adhesive, mix and stir evenly.

[0022] After testing: According to the test method of GB / T 17657-1999 plywood, the dry bonding strength of poplar plywoo...

Embodiment 2

[0024] (1) Add 80 parts of defatted soy flour, 240 parts of water, 2.4 parts of sodium dodecylbenzenesulfonate, 3.8 parts of NaOH and 1.9 parts of CaO into the reactor, start the mechanical stirring bar, stir for 5 minutes, then add 1.6 parts Ethylene glycol and 10 drops of silicone oil are heated up to 90°C, and the reaction time is maintained for 3 hours. After cooling, the material is discharged to obtain a soybean protein adhesive.

[0025] (2) Add 182 parts of 37% formaldehyde solution, 80 parts of water, 20.4 parts of sodium hydroxide, and 100 parts of phenol into the reaction kettle, heat up to 90°C, keep the temperature for 1-2 hours, and then cool and discharge. A phenolic resin is obtained.

[0026] (3) Add 150 parts of 37% formaldehyde solution to the reaction kettle, and adjust the pH to 9.0 with an appropriate amount of 30% NaOH solution. Add 80 parts of melamine, raise the temperature to 85°C, keep it warm for 1-2 hours, then immediately cool to 40°C, adjust the...

Embodiment 3

[0030] (1) Add 80 parts of defatted soy flour, 280 parts of water, 1.6 parts of sodium dodecylbenzenesulfonate, 4.8 parts of NaOH and 1.9 parts of CaO into the reactor, start the mechanical stirring bar, stir for 5 minutes, then add 3.2 parts Ethylene glycol and 10 drops of silicone oil are heated up to 90°C, and the reaction time is maintained for 3 hours. After cooling, the material is discharged to obtain a soybean protein adhesive.

[0031] (2) Add 150 parts of 37% formaldehyde solution to the reaction kettle, and adjust the pH to 9.0 with an appropriate amount of 30% NaOH solution. Add 80 parts of melamine, raise the temperature to 85°C, keep it warm for 1-2 hours, then immediately cool to 40°C, adjust the pH to 9.0 with NaOH solution and discharge to obtain melamine resin.

[0032] (3) Add 160 parts of 37% formaldehyde solution to the reaction kettle, adjust the pH to 7.5~8.5 with an appropriate amount of 30% NaOH solution, add 75 parts of urea for the first time, raise ...

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PUM

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Abstract

The invention provides a crosslinked modified soybean protein adhesive and a preparing method thereof. The preparing method includes: adding defatted soybean powder, water, sodium dodecyl benzene sulfonate and an alkali into a reactor, stirring for 5 min, adding glycol and silicone oil, raising the temperature to 90 DEG C, maintaining the temperature and stirring for 3 h, cooling and discharging. Before the adhesive is used, two or more of epoxy resin, melamine-formaldehyde resin, urea-formaldehyde resin and phenolic resin are added into the adhesive, adopted as crosslinking agents and uniformly mixed. The soybean protein adhesive is simple in preparation process, moderate in viscosity and strong in operationality. The adhesive is excellent in water resistance. After a poplar adhered board test piece is boiled in boiling water for 2 h and dipped in water having a temperature of 63+-3 DEG C for 1 h, the bonding strength of the test piece is not less than 0.7 MPa and is free of tackless phenomena.

Description

technical field [0001] The invention relates to a preparation method of a cross-linked modified soybean protein adhesive. The soybean protein adhesive is mainly used in the production of artificial boards and furniture, and belongs to the technical field of wood adhesives. Background technique [0002] Although the use of natural adhesives has a history of thousands of years, due to its poor water resistance and low bonding strength, it has basically been replaced by synthetic resin adhesives based on petrochemical products. With the rising price of petrochemical products and the continuous strengthening of people's awareness of environmental protection, the development and application of natural adhesives have gradually attracted people's attention. Protein-based adhesives are one of these natural adhesives. The research on protein-based adhesives mostly focuses on plant-based soybean protein adhesives. The modification and application of soybean protein adhesives has becom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J189/00C09J11/08
Inventor 雷洪杜官本吴志刚
Owner SOUTHWEST FORESTRY UNIVERSITY
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