Influences of Polyurethane Raw Materials on Soft Foam (I)
[Polyether is used as the main raw material to react with isocyanate to form carbamate, which is the skeleton reaction of foam products When the molecular weight is increased, the tensile strength, elongation and resilience of the foam increase, and the reactivity of the same kind of polyether decreases When the equivalent value (molecular weight functionality) is the same, the functionality increases, the reaction is accelerated, the crosslinking degree of the polyurethane is increased, the hardness of the foam increases, and the elongation decreases The average energy of polyols should be above 2 5 If the average energy consumption is too low, the recovery of foam will be poor after compression .
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