Influence of Feeding Process on the Properties of Casting Polyurethane Prepolymer
Under the same design formula,the effects of different feeding speeds and feeding methods on polyurethane prepolymer and polyurethane elastomers were studied.The results showed that there was a little difference in the maximum exothermic temperature of the material in the kettle between one rapid feeding and two intermittent feeding;The NCO values of the obtained prepolymer showed no significant difference;The free TDI content of the prepolymer obtained by the two intermittent feeding processes is lower and the viscosity is more uniform;The prepolymer formed by the reaction of two intermittent feeding processes has higher tear strength in the cured elastomer.
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