A tough soybean meal protein adhesive and preparation method thereof

Abstract

The invention discloses a tough soybean meal protein adhesive and a preparation method thereof. The tough soybean meal protein adhesive is composed of the following raw materials in parts by weight: soybean meal powder, trypsin, dispersion medium water, sodium periodate, and triethylenetetramine , dodecyl glycidyl ether and curing agent. The tough soybean meal protein adhesive prepared by the method of the present invention: the soybean meal molecules are firstly degraded and then modified and recombined to form a prepolymer, so that the protein is fully stretched, the molecular active groups are significantly increased, the reactivity is improved, and the solubility and water retention are improved. , Increased toughness, the adhesive prepared after adding curing agent has high water-resistant bonding performance and high stability; it can meet the water-resistant requirements of wood-based panel adhesives, reduce the amount of cross-linking agent, thereby reducing the cost of adhesives and ensuring protein adhesion The practical performance of the agent.

Description

Technical field [0001] The present invention relates to the field of artificial slate adhesive techniques, and more particularly to a toughness soybean protein adhesive and a preparation method thereof. Background technique [0002] my country's precious wood resources are lacking, but there are rich artificial forest resources, using artificial forest speed and agricultural processing residers through adhesive prepared by adhesive, the main raw materials for furniture flooring, indoor decoration decoration, 2016, 2016 my country's total number of people total production is 320 million cubic meters, accounting for about 50% of the world's total production. According to the average production of 9 cubic meters of adhesives per ton, my country's wood adhesive consumption is about 40 million tons (50% solid content) in 2015, of which the urea resin and its modified product account for total yield of adhesive. More than 90%, dominant. Upperdehyde resin adhesives are used in a large a...

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Problems solved by technology

However, urea-formaldehyde resin also has obvious disadvantages, such as poor aging resistance, poor water resistance, and cannot be used to prepare wood-based panels for outdoor use.

[0003] 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 are problems such as poor water resistance and bonding performance and unstable production. This is because the raw materials used to prepare protein adhesives such as soybean meal and cotton meal 1. Due to poor protein solubility, large particles, and large molecular weight of peanut meal, the modification method by adding an external cross-linking agent cannot modify the matrix, resulting in uneven distribution of the cross-linked structure of the protein adhesive and the formation of a large number of weak interfaces. layer, and the water retention capacity is poor. Although the average strength meets the requirements, the bonding quality of different areas of wood-based panels varies greatly, the bonding strength is unstable, and the production efficiency is low.

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