Urea-formaldehyde adhesive and preparation method thereof

Abstract

The invention relates to the technical field of urea-formaldehyde adhesives, and particularly relates to a urea-formaldehyde adhesive additive for artificial boards and a preparation method thereof. The urea-formaldehyde adhesive is composed of the following components in parts by mass: 420-480 parts of 36% formaldehyde, 240-280 parts of urea, 25-30 parts of melamine, 50-80 parts of degreased bean albumen powder, 0.5-0.9 part of polyvinyl alcohol, 2-6 parts of 26 wt% ammonia water, 0.6-0.8 part of sodium dodecylsulfate, 0.5-0.7 part of aldehyde reducing agent, 8-15 parts of complexing agent, 50-80 parts of softened water and 2-8 parts of calcium hydroxide powder. The urea-formaldehyde adhesive additive lowers the amount of free formaldehyde in the urea-formaldehyde glue adhesive, enhances the quality performance of the urea-formaldehyde adhesive, increases the viscosity to some extent, and greatly improves the stability and water resistance. The urea-formaldehyde adhesive has the advantages of low cost and simple preparation process, and is convenient for popularization and use.

Description

technical field [0001] The invention relates to the technical field of urea-formaldehyde adhesives, in particular to an additive for urea-formaldehyde adhesives for wood-based panels and a preparation method thereof. Background technique [0002] Wood-based panels are boards or molded products that are made of wood or other waste wood plants, separated into various unit materials by certain mechanical processing, and checked with or without adhesives and other additives. It mainly includes three categories of products such as plywood, particleboard and fiberboard, and there are hundreds of extended products and deep-processed products. The production of wood-based panels has improved the comprehensive utilization of wood, and 1 cubic meter of wood-based panels can replace 3 to 5 cubic meters of logs. [0003] Formaldehyde is a raw material for the manufacture of synthetic resins, paints, plastics and man-made fibers, and an important raw material for the manufacture of urea...

AI Technical Summary

Problems solved by technology

However, these technical solutions all have defects. (1) Although the use of low molar ratio modified urea-formaldehyde adhesive can effectively reduce the formaldehyde emission of wood-based panel products, the check strength of the product is often reduced; Adding a formaldehyde scavenger to the urea-formaldehyde adhesive for boards effectively reduces the release of free formaldehyde, but at the same time reduces the bonding strength of the wood-based panels, and greatly increases the cost of the adhesive; (3) Post-processing of the wood-based panels processing, but the equipment cost of post-processing is often greater

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