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

Abstract

The invention provides a preparation method of a thermosetting water-soluble phenolic resin nano-powder adhesive. The preparation method comprises the following steps that 1, carrying out vacuum concentration on the thermosetting water-soluble phenolic resin adhesive; 2, carrying out vacuum freeze drying on the concentrated thermosetting water-soluble phenolic resin adhesive; and 3, carrying out grinding and screening after vacuum freeze drying. The nano-powder adhesive prepared by the preparation method is applied to a high-moisture-content artificial board base material in a dry-process sizing mode, an artificial board is produced by a respiration type hot pre-pressing process so that the drying energy consumption of the artificial board base material can be reduced, the curing speed ofthe adhesive is increased, the bonding strength of the artificial board is improved, and the content of free phenol and the release amount of formaldehyde are reduced.

Description

technical field

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

[0002] Phenolic resin adhesive has excellent characteristics such as high bonding strength, strong boiling water resistance, and good thermal stability. However, water-soluble phenolic resin adhesive has shortcomings such as short storage period, slow curing speed, free phenol and formaldehyde release, and low moisture content requirements for bonding substrates, which hinder its application in the wood-based panel industry. application.

[0003] The general spray drying is a kind of suspended particle processing technology. It is a process of atomizing the feed liquid into fine droplets by using high pressure, and rapidly evaporating the solvent in the hot drying medium to form a dry powder product. This drying method will cause...