Fiber-modified soybean protein-based adhesive for wood-based panels and preparation method thereof

Abstract

The invention relates to a fiber modified soybean protein-based adhesive for an artificial board and a preparation method of the fiber modified soybean protein-based adhesive. The fiber modified soybean protein-based adhesive is prepared from raw materials comprising a soybean protein base material, natural fibers, a fiber surface modifier, urea, alkali, a cross-linking agent and water; the fibersurface modifier comprises alkali lignin and / or tannic acid; and the mass ratio of the fiber surface modifier to the soybean protein base material to the natural fibers is (0.1-0.5): (15-60): (1-4). By selecting and adding a specific modifier, the reaction activity of the natural fibers is enhanced, so that the modification effect of the modifier on the soybean protein base material is fully exerted, meanwhile, the dispersity of the modifier in a preparation system is improved, and the improvement capability of the modifier is further improved; and the finally obtained adhesive has higher bonding strength, better water resistance and no formaldehyde release. The solid content of the soybean protein-based adhesive is 25-45%wt, the viscosity is 200-2000 mPa.s, the bonding strength is up to 1.54 MPa, and the activity period is 15-30 days.

Description

technical field [0001] The invention relates to an adhesive and a preparation method, in particular to a soybean protein-based adhesive for wood-based panels and a preparation method thereof. Background technique [0002] my country is the world's largest producer and consumer of wood-based panels. In 2017, my country's wood-based panel production accounted for 50%-60% of the world's total wood-based panel production, including 171.95 million cubic meters of plywood, 62.97 million cubic meters of fiberboard, and 27.78 million cubic meters of particleboard. Other wood-based panels are 32.16 million cubic meters (blockboard accounts for 53%). The continuous and rapid development of the wood processing industry has gradually increased the amount of three-aldehyde adhesives (urea-formaldehyde resin, phenolic resin and melamine resin), accounting for more than 95% of the amount of wood adhesives, resulting in environmental pollution and resource shortages. The problem is also get...

AI Technical Summary

Problems solved by technology

[0006] However, when natural fibers are used in soybean protein-based adhesives, there are often problems such as poor dispersibility and low reactivity.

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