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

Year 2020, , 1 - 10, 15.02.2020

Nesrin Köken Serdar Aydın

https://doi.org/10.18596/jotcsa.495458

Abstract

In this study, the effects of
cyclohexanone formaldehyde ketonic resin (CFR) with different montmorillonite
content on the viscosity, initial adhesion strength and temperature resistance
of polyurethane one component adhesives were investigated. Cyclohexanone
formaldehyde resin (CFR) with varying montmorillonite (MM) content were
incorporated into formulation with a specified weight ratio (rate of 10% by
weight of polyether polyol.) One-shot technique was used for synthesis. 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. Choloroparaffine 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 datas 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.

Keywords

Polyurethane, ketonic resin, cyclohexanone-formaldehyde resin, adhesive

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