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