With the rapid development of the hygiene industry, the competition in the polymer industry is becoming increasingly fierce, and the performance requirements for superabsorbent resins are becoming more stringent. Many times, it takes a long time for a baby to wear a diaper. Because the baby's skin is delicate and long-term contact with a dry diaper, it is easy to cause a series of problems such as red buttocks, eczema, and bacterial growth. Therefore, the long-term reverse osmosis index of diapers is particularly important, and SAP largely determines the dry performance of diapers when used for a long time. SAP long-term reverse osmosis, test not only the pressure and water retention performance after long-term placement, the most important is the speed of hydrolysis.

In contrast, the Nuoer Bio-SAP Application Innovation Center selected SAP, which is commonly used in the market, for long-term reverse osmosis testing.

Test method: Take SAP 2g, weigh 50g and 60g (ie 25 times and 30 times) of physiological saline, pour into the culture dish of ¦Õ=90mm, and after the salt water is absorbed, cover the culture dish and place it for 1h, 2h respectively. After 4h, 6h, 8h, and 16h, the amount of reverse osmosis was tested by pressing the weight of 0.7 PSI for 3 min.

The test data is as follows:

As can be seen from the above comparison chart, the long-term reverse osmosis of NuoerSAP and *Friend SAP is relatively stable, and the amount of reverse osmosis remains at a low level. The NR511 water retention ratio is higher than that of the NR 610S, and the NR511 performs better in the 30-fold long-term reverse osmosis test.

The following is a detailed analysis of the trend of long-term reverse osmosis, the chart is as follows:

It can be seen from the above reverse osmosis trend graph that the reverse osmosis amount of NuoerSAP and *Daya SAP in other SAPs is generally lower than that of the special process *Friend SAP, and the remaining SAP reverse osmosis The amount is on the rise and the change is more obvious. NuoerSAP has a long-term reverse osmosis advantage. This is due to the different production processes. NuoerSAP has the advantages of high molecular weight and slow hydrolysis. Other SAPs have lower molecular weight and faster hydrolysis, which will result in longer osmosis time. This greatly increases the risk of problems such as eczema and red ass due to poor dryness of the diaper.

Therefore, from a safer and more dry perspective, the selection of polymers in diapers must take into account the long-term reverse osmosis index. Nuoer SAP has an obvious advantage in this performance and has a higher cost performance.°¢