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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