1. Anatomy of Superabsorbent Polymer (SAP)
Superabsorbent Polymer accounts for 40% to 55% of the raw material cost in a high-performance baby diaper. Low-cost commodity SAP suffers from severe 'gel blocking'—the outermost particles absorb quickly and swell into a solid impermeable gelatinous wall, blocking subsequent urine from reaching the dry polymer below.
2. Japanese Sumitomo & San-Dia Polymer Matrix
Quanzhou Tingshuang exclusively procures high-crosslink density spherical SAP from Sumitomo Seika and San-Dia:
| Parameter | Commodity Sodium Polyacrylate | Sumitomo / San-Dia Matrix |
|---|---|---|
| Centrifuge Retention (CRC) | 24 - 28 g/g | 34 - 38 g/g |
| Absorption Under Load (AUL 0.7psi) | 14 - 18 g/g | 26 - 30 g/g |
| Absorption Speed (Vortex) | 45 - 65 seconds | < 22 seconds |
| Rewet Value (150ml x 3 doses) | 0.85g - 1.50g | < 0.05g (Bone Dry) |
This high gel strength ensures that even when an infant sits, jumps, or sleeps in prone positions, liquid remains chemically locked within the molecular lattice and will not rewet the skin.