Tannin-based adhesive shaving board and preparation method thereof

A technology of tannin-based glue and tannin glue, which is applied in the direction of adhesives, manufacturing tools, flat products, etc., can solve the problems of poor water resistance, low strength of tannin adhesive glue layer, low cross-linking degree, etc., to improve physical The effect of mechanical strength and water resistance

Inactive Publication Date: 2018-08-14
NANJING FORESTRY UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure tannin adhesives have the problem of low crosslinking degree, which leads to low strength and poor water resistance of the tannin adhesive adhesive layer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, weigh the cellulose nanofibril solid and tannin powder grafted with hyperbranched polyamide at a mass ratio of 1:100, the tannin is condensed tannin extracted from larch, and after mixing, add water to The mass concentration is 53%, stir evenly, add 3% hexamethylenetetramine to the glue before use as the curing agent; then dry the shavings until the moisture content is lower than 5%, the sizing amount is 12%, and stir for about 10 minutes , Formation. The hot-pressing temperature is 190°C, the hot-pressing time is 80s / mm, and the hot-pressing pressure is three-stage 3-2-1MPa. The internal bonding strength of the particleboard prepared by unmodified tannin adhesive is 0.37MPa, the elastic modulus is 1526MPa, the static bending strength is 6.9MPa, and the 2h water absorption thickness expansion rate is 12.7%. The cellulose grafted with hyperbranched polyamide The internal bonding strength of the particleboard prepared by nanofibril modified tannin adhesive reached...

Embodiment 2

[0025] First, weigh the cellulose nanofibril solid and tannin powder grafted with hyperbranched polyamide at a mass ratio of 1.5:100, the tannin is condensed tannin extracted from bayberry, and after mixing, add water to The mass concentration is 55%, stir evenly, add 3% hexamethylenetetramine to the glue before use as the curing agent; then dry the shavings until the moisture content is lower than 5%, the sizing amount is 12%, and stir for about 10 minutes , Formation. The hot-pressing temperature is 190°C, the hot-pressing time is 80s / mm, and the hot-pressing pressure is three-stage 3-2-1MPa. The internal bonding strength of the particleboard prepared by unmodified tannin adhesive is 0.37MPa, the elastic modulus is 1675MPa, the static bending strength is 7.2MPa, and the 2h water absorption thickness expansion rate is 12.7%. The cellulose grafted with hyperbranched polyamide The internal bonding strength of the particleboard prepared by nanofibril modified tannin adhesive re...

Embodiment 3

[0027] First, weigh the cellulose nanofibril solid and tannin powder grafted with hyperbranched polyamide according to the mass ratio of 2:100, the tannin is condensed tannin extracted from black wattle, after mixing, add water to The mass concentration is 53%, stir evenly, add 3% hexamethylenetetramine to the glue before use as the curing agent; then dry the shavings until the moisture content is lower than 5%, the sizing amount is 12%, and stir for about 10 minutes , Formation. The hot-pressing temperature is 190°C, the hot-pressing time is 80s / mm, and the hot-pressing pressure is three-stage 3-2-1MPa. The internal bonding strength of the particleboard prepared by unmodified tannin adhesive is 0.37MPa, the elastic modulus is 1457MPa, the static bending strength is 6.7MPa, and the 2h water absorption thickness expansion rate is 12.7%. The cellulose grafted with hyperbranched polyamide The internal bonding strength of the particleboard prepared by nanofibril modified tannin a...

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Abstract

The invention discloses a tannin-based adhesive shaving board. The tannin-based adhesive shaving board is formed by carrying out hot pressing after applying a tannin-based adhesive modified by cellulose nanofibers grafted with hyperbranched polyamide to wood shavings, the adhesive applying amount is 8%-14%, and the content of the cellulose nanofibers grafted with the hyperbranched polyamide is 0.5-3%wt of the solid tannin content in the tannin-based adhesive modified by cellulose nanofibers grafted with hyperbranched polyamide. The cellulose nanofibers with the high specific surface area, highcrystallinity degree, high strength and other characteristics are used as modifying materials, meanwhile the crosslinking degree between the cellulose nanofibers and tannin molecules is improved through the surface grafted hyperbranched polyamide, and the effect of improving the physical mechanics strength and water resistance of the tannin-based adhesive shaving board is achieved. According to the tannin-based adhesive shaving board, the internal binding strength can be improved by 27.0% or above, the elasticity modulus can be improved by 22.2% or above, the static bending intensity can be improved by 25.3% or above, and 2h water absorption thickness expansion rate can be reduced by 23.6% or above.

Description

technical field [0001] The invention relates to a tannin-based adhesive particleboard and a preparation method thereof, belonging to the field of adhesives. Background technique [0002] Wood-based panel is one of the important products of comprehensive utilization of wood. After nearly 60 years of development, my country has become the world's largest producer of particleboard. Adhesives for wood-based panels mostly use urea-formaldehyde resin adhesives, which have excellent bonding performance and water resistance. However, urea-formaldehyde resin adhesives often produce free formaldehyde in the process of manufacture and use, which is harmful to human health. In recent years, with the improvement of people's awareness of environmental safety, more and more attention has been paid to the formaldehyde-free adhesives and products used in the wood-based panel industry, and a number of new adhesive products have appeared and been applied. Biomass adhesives have the advantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N1/02B27N3/02C09J187/00
CPCB27N1/0209B27N3/02C09J187/005
Inventor 崔举庆应鑫蕾方楚奇许亮亮刘天宇冯尚瑞施春燕霍子微
Owner NANJING FORESTRY UNIV
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