A tough formaldehyde-free soybean meal-based wood adhesive and its preparation method

Abstract

The invention discloses a tough formaldehyde-free soybean meal-based wood adhesive and a preparation method thereof, comprising the following components in parts by weight: 30-33 parts by weight of main agent, 70 parts by weight of dispersion medium water, and 3-6 parts by weight of reinforcing agent , 0.1-0.2 parts by weight of a viscosity regulator, 2-4 parts by weight of a crosslinking agent, and 0.3-0.6 parts by weight of a catalyst; the preparation process is as follows: first weigh each component according to the weight ratio, and add the crosslinking agent to the dispersion medium water , then add the main agent and reinforcing agent, use a high-pressure homogenizer, under the action of 30MPa pressure and 0.5MPa emulsifying force, homogeneously emulsify for 20 minutes; then add the catalyst to the prepared mixture, and react at 80°C for 30min, Lower the temperature at 30°C and discharge; the adhesive of the present invention is easy to form a cross-linked structure, has a high cross-linking density, and a low reaction temperature. The performance of the prepared adhesive is stable, the weak interface layer is significantly reduced, the cost is reduced, the dry / wet strength is good, and the product quality Steady improvement.

Description

technical field [0001] The invention relates to the field of plywood preparation, in particular to a tough formaldehyde-free soybean meal-based wood adhesive and a preparation method thereof. Background technique [0002] my country's precious wood resources are relatively scarce, and artificial forest resources are abundant. Using artificial forest fast-growing wood to prepare wood-based panels through adhesives is the main raw material for furniture floors and interior decoration in the living environment. In 2017, the total output of my country's wood-based panels was 295 million cubic meters Rice, accounting for about 50% of the world's total output, of which more than 60% are plywood products. Based on the average production of 9 cubic meters of wood-based panels per ton of adhesive, the consumption of adhesives for plywood in my country in 2017 was about 18 million tons (solid content 50%), of which urea-formaldehyde resin and its modified products accounted for the tot...

AI Technical Summary

Problems solved by technology

The use of biomass adhesives to prepare wood-based panels can solve the problem of free formaldehyde release from wood-based panels, which is an important way to solve the problem. However, most biomass adhesives have poor water resistance and bonding performance, which limits their industrial application.

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