Starch-based aqueous macromolecule-isocyanate wood adhesive and preparation method thereof

Abstract

A wood adhesive made from isocyanate which is starch base water based polymer is made into main agent consisting of 40 portions to 65 portions of composite modified corn starch emulsion, 8 portions to15 portions of dibasic acid esterifying agent, and 10 portions to 30 portions of polyvinyl alcohol; polymerization isocyanate that is not closed is used for curing agent. The type I and II nonformadehyde with different compression-shear strength are adhesive. The type I repeatedly boiling, type II impregnation in hot water and type II normal state, etc., can be made when being used. The adhesive can be widely applied to wood or bamboo adhesive products such as multi-layer plywood, three-layer wood or bamboo parquet floor, a multi-layer wood parquet floor, a block board, bending wood furniture, a particle board and so on, characterized by inimitable design, low making cost, a long activity period, low apparent viscosity, an easily available equipment, good prepressing performance, easy operation, and no environment pollution. Ecological environmental benefits social and economic benefits come into being after the application and popularization of the product.

Description

technical field [0001] The invention relates to a starch-based water-based polymer-isocyanate wood adhesive and a preparation method thereof, belonging to the technical field of adhesives in chemistry. Background technique [0002] Traditional synthetic resin-based water-based polymer-isocyanate wood adhesives (hereinafter referred to as "water-based polymer-isocyanate wood adhesives": API wood adhesives) generally use the -NCO group in polymeric isocyanate (P-MDI) to temporarily block . When wood glued products are hot-pressed, the adhesive is dissociated using a sealing agent at high temperature, and -NCO is released. At this time, the released free -NCO is combined with the active groups in the API wood adhesive main agent and the wood structure. The active group has a cross-linking reaction to achieve the purpose of extending the pot life. However, this traditional synthetic resin-type water-based polymer-isocyanate wood adhesive has the following problems: high cost; ...

AI Technical Summary

Problems solved by technology

However, this traditional synthetic resin-type water-based polymer-isocyanate wood adhesive has the following problems: high cost; release of other harmful substances; high viscosity; limited activity period extension, resulting in a certain amount of polymerized isocyanate (P-MDI) loss; The film dries quickly and is prone to defects such as poor local gluing