High resilience foam is renowned for its impressive mechanical properties, a relatively high compression load ratio for enhanced seating comfort, exceptional fatigue resistance, and notable breathability and flame resistance. However, a common issue encountered during the manufacturing process is significant sinking of the foam. How can this problem be effectively managed?
Let’s delve into the reasons behind the sinking phenomenon:
- Slow gelation rate: Increase the catalyst dosage to expedite gelation.
- Deterioration in silicone oil stability: Address this by appropriately increasing its usage.
- Incorrect flow ratio or uneven stirring: Paying careful attention to the operation can resolve these issues.
- PPG(a chemical component) impurity: Prevent sinking by avoiding the entry of PPG into the mixture.
Excessive proportions of black material: Adjust material proportions to avoid this problem.
Additional methods to alleviate the sinking issue include:
- Substituting T-12 for T-9.
- Replacing diethylene glycol with propylene glycol.
- Re-adjusting the mold temperature.