Bean pulp protein adhesive and preparation method thereof

Abstract

The invention discloses a bean pulp protein adhesive and a preparation method thereof. The adhesive is prepared from the following components in parts by weight: 25 parts of low-temperature degreasedbean pulp protein powder, 65-70 parts of dispersed medium water, 1-2 parts of nano calcium carbonate, 3-4 parts of EMIBF4, 2-4 parts of urea and 4-5 parts of a cross-linking agent. The preparation method comprises steps of dispersion, high-pressure homogenization and emulsification of a high-pressure homogenizer, ultrasonic treatment, and the like. The bean pulp protein adhesive has the advantagesthat protein molecules can be sufficiently expanded or partially broken, the molecular weight can be reduced, active groups can be remarkably increased, the reaction intensity of the cross-linking agent with proteins is improved, the cross-linking density is remarkably increased, and the adhesive is good in waterproof cementing property, high in stability and high in dry strength. Water-resistantrequirements of a plywood adhesive can be met, the adhesive is low in cost, and the practicability of the bean pulp protein adhesive can be ensured.

Description

technical field [0001] The invention relates to a soybean meal protein, in particular to a soybean meal protein adhesive and a preparation method thereof, which are used for the preparation of plywood and belong to the field of soybean meal protein. Background technique [0002] my country's precious wood resources are scarce, but there are abundant plantation forest resources. Wood-based panels prepared by using plantation fast-growing wood and agricultural and forestry processing residues through adhesives are the main raw materials for furniture flooring and interior decoration in the living environment. In 2015, The total output of wood-based panels in my country is 310 million cubic meters, accounting for about 50% of the world's total output. Calculated based on the average production of 9 cubic meters of wood-based panels per ton of adhesive, the consumption of wood adhesives in my country in 2015 was about 40 million tons (solid content 50%), of which urea-formaldehyd...

AI Technical Summary

Problems solved by technology

The use of vegetable protein adhesives to prepare wood-based panels can solve the problem of free formaldehyde release from wood-based panels, but there is a problem of poor water-resistant bonding performance. Usually, a highly reactive cross-linking agent is added to form a network cross-linked structure to improve the water resistance of the adhesive. Adhesive performance, in order to reduce costs, common soybean meal is often used as raw material, but because soybean meal protein is insoluble in water, large in size, and low in reactivity, the raw material particles for preparing protein adhesives are not uniform, and a large number of weak interfacial layer crosslinking structure distributions are formed Unevenness, poor dry strength, and unstable bonding quality. Although the average strength meets the requirements, the bonding quality varies greatly in different areas of wood-based panels, and the product quality is unstable, which seriously affects its promotion.

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