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Soybean-protein-containing aldehyde-free adhesive and preparation method thereof

A soybean protein and adhesive technology, which is applied in the field of formaldehyde-free adhesive containing soybean protein and its preparation, can solve the problems of increased difficulty of bubble overflow, increased viscosity, decreased apparent viscosity, etc., and achieves excellent performance, improved water resistance, The effect of improving the bond strength

Inactive Publication Date: 2017-06-30
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that with the increase of the addition of layered silicate, the viscosity of the system increases, resulting in an increase in the difficulty of bubble overflow. The more bubbles in the prepared adhesive will inevitably lead to a decrease in apparent viscosity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 25g of soybean protein in 75mL of water, stir for 1 hour at room temperature (control the rotation speed of the stirrer at 80-100r / min), add SDS with 5% of soybean protein in sequence and stir until completely dissolved, and hydrogen with 10% of soybean protein Sodium oxide is stirred until completely dissolved, the magnesium oxide and calcium oxide mixture (the mass ratio of the two is 1:1) is stirred until completely dissolved, and the polyamide epichlorohydrin resin with 5% soybean protein is stirred until completely Dissolve, and continue to stir for 30 minutes to obtain an adhesive product.

[0032] After testing, the dry strength of the adhesive is 5.2Mpa, and the wood destruction rate is 100%; the wet strength is 2.4Mpa after soaking for 3 hours at 63±3°C; after being placed for 360 days under the ambient humidity of 70-80%, the dry strength of the adhesive remains unchanged.

Embodiment 2

[0044] Dissolve 25g of soybean protein in 75mL of water, stir for 1 hour at room temperature (control the rotation speed of the stirrer at 80-100r / min), add SDS with 5% of soybean protein in sequence and stir until completely dissolved, and hydrogen with 10% of soybean protein Stir the sodium oxide until it is completely dissolved, stir the magnesium oxide and calcium oxide mixture (1:1) with 15% soybean protein until it is completely dissolved, and stir the polyamide epichlorohydrin resin with 8% soybean protein until it is completely dissolved, and then continue Stir for 30 minutes to obtain an adhesive product.

[0045] After testing, the dry strength of the adhesive is 6.5Mpa, and the wood damage rate is 100%; the wet strength is 2.6Mp after immersion at 63±3°C for 3 hours; and the dry strength of the adhesive remains unchanged after being placed under 70-80% ambient humidity for 360 days.

Embodiment 3

[0047] Dissolve 25g of soybean protein in 75mL of water, stir at room temperature for 1 hour (control the rotation speed of the stirrer at 80-100r / min), add 5% SDS of soybean protein in turn and stir until completely dissolved, then add 10% of soybean protein in hydrogen Stir the sodium oxide until it is completely dissolved, add 15% of the soybean protein mass, magnesium oxide and calcium oxide mixture (1:1) and stir until it is completely dissolved, add 10% of the polyamide epichlorohydrin resin and stir until it is completely dissolved, and continue stirring After 30 minutes, an adhesive product was obtained.

[0048] After testing, the dry strength of the adhesive is 6.8Mpa, and the wood damage rate is 100%; the wet strength is 2.8Mpa after immersion at 63±3°C for 3 hours; and the dry strength of the adhesive remains unchanged after being placed for 360 days at an ambient humidity of 70-80%.

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Abstract

To overcome the defects of a soybean adhesive in the prior art, the invention provides a soybean-protein-containing aldehyde-free adhesive and a preparation method thereof, and belongs to the technical field of an aldehyde-free adhesive used for timber. The aldehyde-free adhesive takes soybean protein as a main component, and contains a surfactant, the weight of which is 1-10% of that of soyabean protein, an alkaline compound, the weight of which is 3-15% of that of soyabean protein, metal oxide, the weight of which is 5-20% of that of soyabean protein, polyamide epoxy haloalkane resin, the weight of which is 3-20% of that of soyabean protein, and water the weight of which is 2-5 times of that of soyabean protein. Soybean protein is taken as a substrate, and the surfactant, the modifier of metal oxide and hydroxide and a cross-linking agent are used for comprehensive modification of soybean protein, so that the adhesive strength and water proofness of the soybean protein adhesive are improved.

Description

technical field [0001] The invention belongs to the technical field of formaldehyde-free adhesives for wood, in particular to a formaldehyde-free adhesive containing soybean protein and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the wood-based panel industry, the consumption of wood adhesives has increased sharply, among which "trialdehyde glue (urea-formaldehyde glue, phenolic glue, melamine-formaldehyde glue)" accounts for 80% of the adhesives used in wood and wood-based panel industries. Since these three resins all use formaldehyde as a raw material, it is inevitable to contain a certain amount of formaldehyde in the resin adhesive. [0003] With the improvement of people's awareness of health and environmental protection, the control of formaldehyde content in wood-based panels in various countries is also more stringent, thus making soybean adhesives containing vegetable proteins become a research hotspot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J189/00C09J11/04C09J11/08
CPCC09J189/00C08L2312/00C09J11/04C09J11/08
Inventor 肖国勇鲁云华王翠苹迟海军董岩胡知之
Owner UNIV OF SCI & TECH LIAONING
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