Preparation method and application method of thermosetting water-soluble urea-formaldehyde resin nano powder adhesive

Abstract

The invention provides a preparation method of a thermosetting water-soluble urea-formaldehyde resin nanopowder adhesive. The preparation method comprises the following steps: 1, performing vacuum concentration on a thermosetting water-soluble urea-formaldehyde resin adhesive; 2, performing pH adjustment on the concentrated thermosetting water-soluble urea-formaldehyde resin adhesive; 3, performing vacuum freeze drying on the thermosetting water-soluble urea-formaldehyde resin adhesive after pH adjustment in the step 2; 4, grinding and screening after vacuum freeze drying. The adhesive prepared by the preparation method is applied to a high-water content artificial board substrate by dry gluing, and an artificial board is produced by a respiratory hot prepressing technology, so that the drying energy consumption of the artificial board substrate can be lowered and the curing speed, the gluing strength and the water resistance of the adhesive can be improved, and the amount of formaldehyde released from the artificial board can be reduced.

Description

technical field

[0001] The invention relates to a preparation method of a thermosetting water-soluble urea-formaldehyde resin nano-powder adhesive and an application method in the production of wood-based panels, belonging to the field of wood-based panel manufacturing. Background technique

[0002] In 2015, the output of my country's wood-based panels reached 287 million cubic meters, accounting for 60% of the world's wood-based panel production, and the consumption of adhesives was 15.3 million tons. The consumption is still growing at a rate of about 10% with the increase of wood-based panel production. Among them, the consumption of urea-formaldehyde resin adhesives was 13.92 million tons (including urea-melamine-formaldehyde copolymer resin adhesives), accounting for nearly 90% of the consumption of wood-based panel adhesives. Urea-formaldehyde resin adhesive is the cheapest variety among all synthetic resins. It has long dominated the production of wood-based panels an...