How do SAP absorb urine?

The diaper absorbent core of baby diapers is the core component that realizes its urine absorption function, which mainly relies on the excellent performance of polymer absorbent resin (SAP). SAP can absorb and lock a large amount of water, and its water absorption capacity is so strong that it can reach hundreds or even thousands of times its own weight.

In the structure of diapers, absorbent polymer exists in granular form and is mixed with fluff pulp to form the absorbent layer. When urine touches the surface layer of the diaper (usually made of non-woven fabric), the urine will be quickly received and transferred to the diversion layer, which is also made of non-woven fabric to ensure that the urine can be evenly distributed to the absorbent layer. In the absorbent layer, the hydrophilic group of SAP immediately takes effect, quickly attracting and fixing water molecules, causing the SAP particles to swell and fuse with each other, thereby efficiently absorbing urine.

SAP itself has the property of being insoluble in water, so it can absorb a large amount of urine without exudation. At the same time, its excellent water retention capacity ensures that the urine is firmly locked inside the diaper, effectively preventing urine backflow or leakage.

In summary, the process of urine absorption by polymers in baby diapers is a complex system involving multiple efficient steps such as urine reception, conduction, absorption and locking. This process ensures that diapers can quickly and effectively absorb and lock urine, providing babies with a lasting dry and comfortable experience.