Aqueous polymer-isocyanate adhesive and preparation method thereof

Abstract

The present invention discloses a preparation method of an aqueous polymer-isocyanate adhesive. The aqueous polymer-isocyanate adhesive comprises a main agent and a cross-linking agent, wherein the main agent comprises polyvinyl alcohol, deionized water, ethanol and a polyacrylate emulsion, the cross-linking agent comprises polyaryl polymethylene isocyanate and dioctyl phthalate, and the main agent components and the cross-linking agent components are respectively subjected to dissolving mixing to prepare the aqueous polymer-isocyanate adhesive. According to the present invention, solubility of polyvinyl alcohol in water is increased, compatibility of isocyanate and a hydroxyl polymer is increased, use cost and price are reduced, the adhesive does not contain free phenol and free aldehyde, and provides a bonding strength of 1.71-2.59 MPa for wood when use, and a working life is more than 40 min.

Description

technical field [0001] The invention relates to adhesive technology, in particular to a water-based polymer-isocyanate adhesive and a preparation method. Background technique [0002] At present, in order to ensure people's health and safety, many countries, including my country, have imposed strict restrictions on the amount of formaldehyde and phenol released from various materials such as furniture and residential coatings, and formulated strict binding mandatory standards. , which limits the scope of use of amino resin adhesives. Traditional urea-formaldehyde resin adhesives and phenolic resin adhesives no longer meet people's requirements for product quality and the environment. In this regard, people's eyes are gradually turning to environmentally friendly adhesives, and the development and use of non-toxic, low-toxic, and efficient wood processing synthetic resin adhesives is a hot topic that people generally pay attention to. [0003] Two-component water-based polyme...

AI Technical Summary

Problems solved by technology

[0004] At present, the main agent of the water-based polymer-isocyanate adhesive used in production is polyvinyl alcohol (PVA) aqueous solution, but due to the limited solubility, the dissolution effect of polyvinyl alcohol in a small amount of water is poor, and insoluble small particles will be produced. A large amount of water will reduce the effective components of the adhesive; at the same time, the crosslinking agent component isocyanate of the water-based polymer-isocyanate adhesive currently used in the production and use of people has poor compatibility with the hydroxyl polymer in the main agent, resulting in the isocyanate reacting with water. The large amount will weaken the reaction and crosslinking effect of isocyanate on the hydroxyl groups on the polymer and the hydroxyl groups on the wood surface, and also cause more bubbles in the glue layer due to the reaction of too many isocyanate groups with water, which will reduce the bonding strength. It affects the overall bonding effect on wood, and in order to achieve higher bonding strength, it is necessary to increase the amount of crosslinking agent, which increases the use cost and price

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