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Hyperbranched polyamide modified tannin adhesive, preparation method thereof, plywood and application of the hyperbranched polyamide modified tannin adhesive

A technology of hyperbranched polyamide and tannin glue, which is used in adhesive additives, bonding of wooden veneers, manufacturing tools, etc. and other problems, to achieve the effect of improving the bonding strength and water resistance, and improving the degree of cross-linking and polycondensation.

Inactive Publication Date: 2017-05-31
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the structure and characteristics of tannin itself, a series of defects of tannin are exposed, such as low degree of crosslinking and short pot life, poor physical mechanics and water resistance of the adhesive layer, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First, weigh the hyperbranched polyamide solid and bayberry tannin powder according to the mass ratio of 1:100, add water after mixing to a mass concentration of 45%, stir evenly, adjust the pH of the glue solution to 6 with 30% NaOH solution, and use Add 3% hexamethylenetetramine as a curing agent; then dry the veneer until the moisture content is lower than 8%, and the glue amount is 260 g / m 2 , aged for about 15 minutes, and assembled. The hot-pressing temperature is 140°C, the hot-pressing time is 1.2min / mm, and the hot-pressing pressure is 1.0-1.2MPa. The dry strength of plywood manufactured with unmodified tannin adhesive is 0.58 MPa, and the wet strength is 0.49 MPa. The bonding strength of plywood manufactured after hyperbranched polyamide modified tannin adhesive is above 0.85 MPa, an increase of 46.0%. The wet strength is above 0.80 MPa, an increase of 63.0%.

Embodiment 2

[0023] First, weigh hyperbranched polyamide powder and bayberry tannin powder according to the mass ratio of 2:100, add water after mixing to a mass concentration of 50%, stir evenly, adjust the pH of the glue solution to 6 with 30% NaOH solution, and use Add 3.8% hexamethylenetetramine as a curing agent; then dry the veneer until the moisture content is lower than 8%, the amount of glue applied is 260 g / m2, and it is aged for about 15 minutes to form a blank. The hot-pressing temperature is 140°C, the hot-pressing time is 1.2min / mm, and the hot-pressing pressure is 1.0-1.2MPa. The dry strength of plywood manufactured with unmodified tannin adhesive is 0.58 MPa, and the wet strength is 0.49 MPa. The bonding strength of plywood manufactured after hyperbranched polyamide modified tannin adhesive is above 0.76 MPa, an increase of up to 31.0%. The wet strength is above 0.75 MPa, an increase of 53.0%.

Embodiment 3

[0025] First, weigh hyperbranched polyamide powder and larch tannin powder according to the mass ratio of 4:100, add water after mixing to a mass concentration of 55%, stir well, adjust pH=8, and add 4.2% trimethylol before use Nitromethane is used as the curing agent; then the veneer is dried until the moisture content is lower than 8%, and the glue amount is 290 g / m 2 , aged for about 15 minutes, and assembled. The hot-pressing temperature is 135°C, the hot-pressing time is 1.2min / mm, and the hot-pressing pressure is 1.0-1.2MPa. The dry strength of plywood manufactured with unmodified tannin adhesive is 0.51 MPa, and the wet strength is 0.46 MPa. The bonding strength of plywood manufactured after hyperbranched polyamide modified tannin adhesive is above 0.75 MPa, an increase of up to 47.0%. The wet strength is above 0.72 MPa, an increase of 56.0%.

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Abstract

The invention discloses a hyperbranched polyamide modified tannin adhesive. The hyperbranched polyamide modified tannin adhesive comprises a hyperbranched polyamide solid and tannin powder, wherein the content of the hyperbranched polyamide is 1-6%wt of the content of tannin. The invention also discloses hyperbranched polyamide modified tannin adhesive based plywood, a preparation method of the hyperbranched polyamide modified tannin adhesive, and application of the hyperbranched polyamide modified tannin adhesive in preparation of the plywood. The hyperbranched polyamide modified tannin adhesive provided by the invention utilizes a hyperbranched polymer with a lot of active functional groups as a crosslinking agent to improve the cross-linking degree and polycondensation degree between tannin molecules, thus reaching the purpose of improving the bonding strength and water resistance. Compared with the unmodified adhesive, the hyperbranched polyamide modified tannin adhesive has the advantages that the dry bonding strength is increased by 27% or above, and the wet bonding strength is increased by 33% or above.

Description

technical field [0001] The invention relates to a hyperbranched polyamide modified tannin adhesive and a preparation method thereof, hyperbranched polyamide modified tannin adhesive plywood and hyperbranched polyamide modified tannin adhesive in the preparation of plywood The application belongs to the field of adhesives. Background technique [0002] At present, my country's wood-based panel products are mostly used in furniture manufacturing and interior decoration design, among which urea-formaldehyde resin accounts for the vast majority of the entire adhesive usage. Urea-formaldehyde resin and its modified products are a kind of formaldehyde-containing condensation adhesives, which will continuously release free formaldehyde during the production and use of furniture products, which will affect people's living environment and quality of life. Studies have shown that formaldehyde and other harmful substances in the home environment can stimulate human organs such as eyes...

Claims

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Application Information

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IPC IPC(8): C09J11/08B27D1/08
CPCB27D1/08C09J11/08
Inventor 崔举庆应鑫蕾霍子微韩书广兰平贾翀蒋贵杨韩勇卢晓宁
Owner NANJING FORESTRY UNIV
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