Urea-formaldehyde glue adhesive and preparation method thereof

Abstract

The invention relates to the technical field of urea-formaldehyde glue adhesives, and in particular relates to an additive of a urea-formaldehyde glue adhesive for artificial boards and a preparation method of the additive. The urea-formaldehyde glue adhesive consists of the following components in parts by mass: 400-500 parts of 36% formaldehyde, 250-270 parts of urea, 15-20 parts of melamine, 5-15 parts of n-butyl alcohol, 0.5-0.9 part of polyvinyl alcohol, 2-6 parts of ammonia water with the mass fraction of 26%, 10-18 parts of starch, 1.2-2.8 parts of rosin, 0.5-0.7 part of a modified aldehyde reducing agent, 8-15 parts of a complexing agent, 50-80 parts of softened water and 2-8 parts of calcium hydroxide powder. The additive of the urea-formaldehyde glue adhesive, provided by the invention, has the beneficial effects that the content of free formaldehyde in the urea-formaldehyde glue adhesive is reduced, the mass performance of the urea-formaldehyde glue is improved, the viscosity is increased, and the stability and water resistance are also greatly improved; and moreover, the urea-formaldehyde glue adhesive provided by the invention is low in cost, simple to prepare and convenient to popularize 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 also reduced; (2) in artificial Adding a formaldehyde scavenger to the urea-formaldehyde glue 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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