Synthesis of Reactive Polyurethane Adhesives and Studying the Effect of Ketonic Resins

Abstract

In this study, the effects of cyclohexanone formaldehyde ketonic resin (CFR) with different montmorillonite (MM) content (from 0,5 to 3 wt%) on the viscosity, initial adhesion strength, and temperature resistance of polyurethane one-component adhesives were investigated. In situ MM modified cyclohexanone formaldehyde resin (MM-CFR) was used as polyol into formulation with a specified weight ratio (rate of 10% by weight of polyether polyol). One-shot technique was used for synthesis. CFR with varying montmorillonite (MM) content were incorporated blank polyurethane was synthesized using polyether polyol and polymeric 4,4'-methylene diphenyl diisocyanate (p-MDI). In experimental studies, the ratio of the isocyanate groups (NCO) to the hydroxyl group (OH) was 4.84. Reaction completion was followed by FTIR spectroscopy. Chloroparaffin was used as a plasticizer to adjust the viscosity and to reduce the fragile structure of the product. The NCO % values of the synthesized adhesive PU were measured by titration. When TGA data were examined, it was found that the heat resistance of the product increased with the addition of CFR and MM-CFR. As a result, it has been determined that the adhesion properties and thermal resistance were improved with the use of ketonic resins in one component reactive adhesives.