A kind of aldehyde-free flour-based adhesive and preparation method thereof

Abstract

The invention discloses an aldehyde-free flour-based adhesive and a preparation method thereof. 0.1-0.3 parts by weight of the regulator, 8-12 parts by weight of the crosslinking agent, and 0.5-1 parts by weight of the catalyst; prepared by the following method: weighing each component according to the weight ratio, adding the reinforcing agent to the dispersion medium water, and ultrasonicating for 15 minutes , and 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, homogeneously emulsify for 20 minutes; add the remaining main agent to the mixture obtained above, mix well and then add cross-linking The adhesive and the remaining catalyst were reacted at 80°C for 30 minutes, and the material was discharged at a temperature of 30°C; the adhesive of the present invention is easy to form a cross-linked structure, has a high cross-linking density, a low reaction temperature, a simple preparation method, and the prepared adhesive has stable performance and weak interface. Significant drop in ply, lower cost, good dry / wet strength, and stable improvement in product quality.

Description

technical field [0001] The invention relates to the field of plywood preparation, in particular to an aldehyde-free flour-based 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 adhesive...

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Problems solved by technology

[0003] With the improvement of people's living standards, the pollution of human settlements has attracted attention. The use of biomass adhesives to prepare wood-based panels can solve the problem of free formaldehyde release from wood-based panels. It is an important way to solve the problem, but most biomass adhesives There is the problem of poor water-resistant adhesive performance of the agent, which limits its industrial application

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