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
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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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