Aldehyde free soybean protein adhesive having multiple network structure and preparation method thereof

Abstract

The invention relates to an aldehyde free soybean protein adhesive having a multiple network structure. The adhesive comprises following components in parts by weight: 15 to 18 parts of a main agent,85 to 88 parts of a dispersing medium (water), 0.05 to 0.1 part of bromelain, 2 to 3 parts of tannic acid (TA), 0.25 to 0.5 part of zinc sulfate heptahydrate, and 2 to 4 parts of a crosslinking agentnamely 1,2,3-glyceroldiglycidyl ether (PTGE). The adhesive has a triple network structure, has the advantages of proper viscosity, high dry / wet bonding strength, good toughness, good mildew resistantproperty, and can be evenly painted; the performance is stable, and the product quality is stably improved. The invention further relates to a preparation method of the adhesive.

Description

technical field [0001] The invention relates to the technical field of preparation of veneer-based wood-based panels, in particular to a soybean protein wood 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 2018, the total output of wood-based panels in my country reached 300 million cubic meters, accounting for about 50% of the world's total output, of which more than 60% are veneer wood-based panel products. Based on the average production of 9 cubic meters of wood-based panels per ton of adhesive, the consumption of adhesives for veneer-based wood-based panels in my country in 2018 was about 18 million tons (solid content 50%), of which urea-formaldehyde resin...

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Problems solved by technology

[0004] In order to solve the problems of poor water resistance and high brittleness of soybean protein adhesives, the present invention designs a soybean protein wood adhesive with a multiple network structure and its preparation method. The adhesive has high water-resistant bonding strength, Good toughness, good anti-mold performance, and the adhesive has moderate viscosity, good permeability, and convenient sizing, which can meet the water resistance and process requirements of plywood adhesives. The cost of adhesives is low, ensuring that biomass adhesives practical performance

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