Formaldehyde-free soybean protein adhesive and preparation method thereof

Abstract

The invention relates to a formaldehyde-free soybean protein adhesive, which comprises the following components in parts by weight: 32 parts of soybean powder, 68 parts of a dispersion medium, 3-5 parts of a crosslinking agent and 0.3-0.6 parts of a reinforcing agent; the dispersion medium It is an oxidized glucose-choline chloride deep eutectic solvent, the reinforcing agent is modified feather protein crystal, and the crosslinking agent is modified polyurethane. The present invention also relates to a preparation method of the above-mentioned formaldehyde-free soybean protein adhesive. The formaldehyde-free soybean protein adhesive of the present invention can be prepared by mixing and stirring various raw materials at room temperature, and has the advantages of high preparation efficiency, no release of harmful substances, high product reactivity, easy formation of cross-linked network structure, and high cross-linking density , After curing, it has the characteristics of good water-resistant bonding performance, good solubility and dispersion, and good water retention. The board prepared and produced by using the above-mentioned formaldehyde-free soybean protein adhesive can meet the quality requirements of wood-based panels.

Description

technical field [0001] The invention relates to the technical field of biomass adhesives, in particular to an aldehyde-free soybean protein adhesive and a preparation method thereof. Background technique [0002] Precious wood resources are relatively scarce, and plantation forest resources are abundant. The use of plantation fast-growing wood and adhesives to prepare wood-based panels is the main raw material for furniture, flooring, and interior decoration in the living environment. The total output of wood-based panels is large, most of which are plywood. product. Based on the average production of 9 cubic meters of plywood per ton of adhesive, the consumption of adhesive for plywood is huge, of which urea-formaldehyde resin and its modified products occupy the leading position in adhesives. Urea-formaldehyde resin adhesive is widely used in the wood industry due to its advantages of abundant raw materials, low price and good water solubility, but there is a problem of f...

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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.

For example, hydrolyzed soybean protein can be used as a raw material to prepare adhesives for wood-based panels to solve the problem of free formaldehyde release from wood-based panels. However, hydrolyzed soybean protein has a large amount of silicified cuticle, and the protein has a large molecular weight, resulting in poor water solubility and poor water resistance. , poor emulsification, poor solubility and other problems, it is difficult to apply to the production of wood-based panels

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