Dimensional Stability Additives for TDI

When producing flexible high resilience foam, it is important to provide a wider TPR window to expand processing latitude and at the same time maintain or improve physical properties. This should result in reduced scrap and/or repair rates, providing improved economics for the polyurethane producer. 

A newly developed cell opening catalyst, Dabco BL-53, was evaluated to determine its impact on dimensional stability and general processability. Dabco BL-53 affords all the benefits of Dabco BL-11 or Dabco BL-17, with the added advantage of cell opening and slightly delayed initiation times. Dabco BL-53 is not a chemical equivalent for Dahco BL-11 or Dabco BL-17 however, it will provide similar performance. For rapid demoulding systems, it is recommend that Dabco BL-53 be used at 0.12 to 0.22 pphp, with the optimum level at 0.16 to 0.19 pphp, in combination with a Dahco 33-LV level at 0.30 to 0.32 pphp. 

A TDI cushion formulation, with a density of 45 kg/m and a TDI back formulation, with a density of 35 kg/m were used in the TDI automotive study. All of these formulations were modified accordingly with the appropriate crosslinker, water, and additive levels for the chosen density range. These formulations are shown in Tables 1.2 and 1.3. 

SSF experimental silicone surfactant pphp parts per hundred polyol  

Carbon Dioxide Trapped vs. Time I BarJr Fonnulation  

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