Influence of Relative Humidity on the Curing Behavior of Polyurethane

Polyurethanes are used in material production for a very wide range of industrial applications, such as automotive (suspension bushing, high-resilience foam seating), housebuilding (rigid foam insulation panels), transportation (durable elastomeric wheels for shopping carts) as well as for the electrical industry (putting compounds) and the plastic industry (high performance adhesives or hard plastic parts). In this application report, the influence of relative humidity on the rheological behavior of a polyurethane resin during curing has been investigated using a modified ring geometry, an Anton Paar Modular Compact Rheometer, a Convection Temperature Device and a Modular Humidity Generator.

Introduction

Polyurethanes are used in material production for a very wide range of industrial applications, such as automotive (suspension bushing, high-resilience foam seating), housebuilding (rigid foam insulation panels), transportation (durable elastomeric wheels for shopping carts) as well as for the electrical industry (putting compounds) and the plastic industry (high performance adhesives or hard plastic parts). Depending on the final product’s application, both storage and processing of uncured polyurethanes are sensitive to the presence and amount of water and catalyst. Humidity is a critical parameter for the balance between curing and blowing, since polyurethane blowing is caused by the reaction of water with an isocyanate.

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