Adhesive film for bonding composite boards and its preparation method and application

Abstract

The invention provides an adhesive film for bonding a composite board. The adhesive film comprises a polyolefin layer and a thermosetting resin layer arranged on the polyolefin layer surface, wherein the thermosetting resin layer is obtained by coating and curing the thermosetting resin on double-side of the polyolefin surface; the mass of the thermosetting resin is 0.5-35% of the polyolefin mass; the thermosetting resin structure contains phenolic hydroxyl and formyl group. The adhesive film provided by the invention is used for the bonding in the preparation process of the composite board, the water content requirement on the composite board before adhesion is low, and the operation of controlling the water content to be less than 12% is unnecessary, even less than 6%, the board veneer surface bonding process can be accomplished, and the veneer gumming is unnecessary to prevent more moisture from being absorbed, and then the glue-drying time in the composite board preparation process can be shortened.

Description

technical field [0001] The invention belongs to the technical field of composite board preparation, and in particular relates to an adhesive film for bonding composite boards, a preparation method and application thereof. Background technique [0002] The boards include all-bamboo composite boards, wood composite boards and bamboo-wood composite boards, which are obtained by drying the raw boards, bonding them with an adhesive, and then drying the rubber to form a blank. [0003] Whether it is bamboo, wood or bamboo-wood mixed boards, the bamboo veneer and wood veneer must be dried, and the moisture content of the board after drying and before dipping is clearly limited, and the moisture content of the dried veneer is required. The moisture content of bamboo curtains and bamboo mats is lower than 6%. If the boards with moisture content that do not meet the requirements are directly used for dipping, it will affect the smooth progress of dipping, resulting in Adhesive is not...

AI Technical Summary

Problems solved by technology

[0003] Whether it is bamboo, wood or bamboo-wood mixed boards, the bamboo veneer and wood veneer must be dried, and the moisture content of the board after drying and before dipping is clearly limited, and the moisture content of the dried veneer is required. The moisture content of bamboo curtains and bamboo mats is lower than 6%. If the boards with moisture content that do not meet the requirements are directly used for dipping, it will affect the smooth progress of dipping, resulting in Not enough glue

In order to increase the amount of glue absorbed, the dipping time will be extended, which will lead to the absorption of more water during the dipping process, and the drying time after dipping will also be extended accordingly. The requirement of lower moisture content after drying and the extension of the drying time are even increase energy consumption

[0004] Moreover, the single-layer sheet after dipping must be dried until the moisture content is 10-15% before it can be used and assembled, resulting in energy waste and repeated operations; after the assembly, a press is used for hot pressing, and the hot pressing process requires The "cold in and cold out" production process is adopted, that is, during the hot pressing process, the assembled slabs must be heated and pressurized. After a certain hot pressing time, they must be cooled to 45°C or lower before the pressure is released and the slabs will be released. cause energy waste

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