Aldehyde-free flour-based adhesive and preparation method thereof

Abstract

The invention discloses an aldehyde-free flour-based adhesive and a preparation method thereof. The adhesive comprises the following components, by weight: 38-42 parts of a main agent, 60 parts of disperse medium water, 0.4-0.8 part of a reinforcing agent, 0.1-0.3 part of a viscosity regulator, 8-12 parts of a crosslinking agent, and 0.5-1 part of a catalyst. The adhesive is prepared by the following method: weighing the component according to a weight ratio, adding the reinforcing agent into the disperse medium water, carrying out ultrasound for 15 minutes, adding half weight of the main agent, and carrying out homogenization emulsification for 20 minutes with a high-pressure homogenizer under pressure of 30 MPa and an emulsifying force of 0.5 MPa; and adding the remaining main agent into the obtained mixture, after the main agent and the mixture are uniformly mixed, the crosslinking agent and the remaining catalyst are added, carrying out a reaction at 80 DEG C for 30 min, reducing the temperature by 30 DEG C, and then discharging a product. The adhesive of the invention has the advantages of easy formation of a crosslinking structure, large crosslinking density and low reaction temperature. The preparation method is simple. The prepared adhesive has the advantages of stable performance, obviously reduced weak interface layer, good dry / wet strength and stably improved 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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