Wood adhesive and preparation method thereof

Abstract

The invention discloses a wood adhesive. The wood adhesive comprises the following raw materials in percentages by weight: 65% to 75% of a polyvinyl acetate emulsion, 1% to 3% of PVA, 1% to 4% of hydroxyethyl cellulose, 5% to 10% of hydroxyl-terminated polybutadiene, 10% to 20% of deionized water, 0.5% to 2% of an additive, 0.5% to 1% of a cross-linking agent A and 3% to 6% of a cross-linking agent B. The invention also discloses a preparation method of the wood adhesive. The wood adhesive disclosed by the invention is high in stability, high in curing speed, convenient in construction and high in production efficiency, and has excellent tenacity, relatively high compression shear strength and high frost melting resistance and water resistance after curing.

Description

technical field [0001] The invention relates to a wood adhesive, in particular to a wood adhesive and a preparation method thereof. Background technique [0002] With the changes in the wood raw material market, the supply of wood materials in my country has shifted from traditional solid wood to glued wood materials. Traditional wood adhesives are dominated by cheap aldehyde adhesives such as urea-formaldehyde resins, phenolic resins, and melamine-formaldehyde resins, which have very strict requirements on the moisture content of wood, and will produce toxic formaldehyde when used, which is harmful to human health and the natural environment. cause harm. With the improvement of people's awareness of indoor environmental safety and environmental protection, industrial formaldehyde-free wood adhesives have received more and more attention. [0003] The earliest used polyvinyl acetate emulsion, also known as white latex, is difficult to meet the needs of use and the current ...

AI Technical Summary

Problems solved by technology

This two-component panel glue has high strength and excellent water resistance, and is especially suitable for the bonding of hard wood. However, the single modified isocyanate curing agent has a slow reaction rate at room temperature, which affects production efficiency. Increase the reaction rate, but also speed up the side reaction rate, which has a great impact on the strength of the adhesive layer. In addition, the amount of curing agent is large and the degree of crosslinking is large. Although the bonding strength is improved, the toughness and freeze-thaw stability are not good.

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