Analysis of Factors Influencing the Efficiency of Catalysts Used in Waste PU Degradation.

As can be seen from Figure 11 , the hydroxyl value of the used polyurethane rigid foam recovered using the traditional alkali metal KOH catalyst under different catalytic systems showed an increasing trend with the addition of the catalyst, because the activity of the traditional catalyst is weak compared with that of the ethylene glycol titanium catalyst, and a small amount of the traditional alkali metal catalyst cannot sufficiently break the carbamate bonds in the used polyurethane foam, resulting in a system with more end-hydroxyl or branched hydroxyl groups and a lower hydroxyl value.

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