How to deal with the flatulence of high resilience sponge during production?

The polyether polyols used in high resilience sponges are generally end-capped with EO. The polyethers are more active. The produced sponges have a mixed distribution of cell diameters, different skeleton thicknesses, and large open porosity. Under different deformation states, it produces different supporting force of rebound force. It has superior resilience and air permeability, low post-exposure loss, high compression load ratio, and good flame resistance. Its thermal aging, wet aging and dynamic fatigue properties are relatively good.

1. From the analysis of polyols, the most direct problem is the activity. If you use high-activity polyether with high-activity B material, it is bound to be flatulence. For example, 330N polyether has high activity and is easy to close cells.
2. The temperature decreases at the point where the flow decreases.
3. Silicone oil. If the initial reaction is too fast and cause flatulence, you can put less silicone oil; if simple catalysis, you can put some points appropriately to balance the catalyst.
4. Pore opening agent. Insufficient openings, especially the problem of grafted polyether, closed cells will be severe.
5. The skin is thick and the viscosity is high, and the gas inside the bubble cannot be discharged. How can it gather together? Adding MC can solve it.
In short, high resilience is the simplest kind of soft foam. You will find a breakthrough in the problem if you do a few more experiments and more summaries.