A kind of starch adhesive and preparation method thereof

Abstract

The invention discloses a starch adhesive and a preparation method thereof, comprising the following components in parts by weight: 38-42 parts by weight of a main agent, 60 parts by weight of dispersion medium water, 1-1.5 parts by weight of a reinforcing agent, and 0.1 parts by weight of a viscosity modifier. -0.3 parts by weight, 5-8 parts by weight of cross-linking agent, 0.3-0.6 parts by weight of catalyst; the starch adhesive is prepared by the following method: firstly weigh each component according to the weight ratio, add the reinforcing agent into the dispersion medium water, Ultrasonic for 15 minutes, then add half the weight of the main agent, use a high-pressure homogenizer, under the action of 30MPa pressure and 0.5MPa emulsifying force, homogenize and emulsify for 20 minutes; then add the remaining main agent to the obtained mixture. Then add the crosslinking agent and sodium hydroxide, react at 80°C for 30 minutes, and cool down to 30°C for discharging; the adhesive of the present invention is easy to form a crosslinking structure, the crosslinking density is large, the reaction temperature is low, and the performance of the prepared adhesive is stable and weak. The interface layer is obviously reduced, the cost is reduced, the dry / wet strength is good, and the product quality is steadily improved.

Description

technical field [0001] The invention relates to the field of plywood preparation, in particular to a starch 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 total output of adhesives More than 90% of t...

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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