Español
العربية
Francés
Русский
Polymer Resin
Polymer water absorbent resin (SAP) is a typical functional polymer material, SAP for short. It can absorb hundreds or even thousands of times its own weight of water, and has a strong water retention ability, so it is also known as super water absorption agent or high water retention agent. The health field is mainly used as raw materials for sanitary napkins and diapers.
In terms of chemical structure, superabsorbent resins are low crosslinked or partially crystalline polymers with many hydrophilic groups. The health field is mainly used as raw materials for sanitary napkins and diapers.
—CH2=CH-COOH + NaOH → —CH2=CH-COONa+H2O
n (-CH2 =CH-COONa) →[-ch2-ch (COONa)]n
Sodium polyacrylate → Bridge into a network structure
The internal ion concentration is higher than the external, resulting in osmotic pressure.
SAP has a three-dimensional cross-linked bridge, which can inhibit the expansion phenomenon, that is, the water absorption of the superabsorbent resin is generated.
Mixed with villous fibers
In actual production, it is very important whether SAP and fluff fiber are mixed evenly, which is directly related to the size of the product's liquid absorption performance and the uniformity of the liquid absorption, and also plays an important role in avoiding gel adhesion and hard spot penetration of the surface of the paper web, preventing the slide between layers.
Keep SAP dry
Before the SAP powder and fiber are evenly mixed, it is necessary to maintain the dryness of SAP, which directly affects the metering, transportation, dispersion of SAP and the mixing uniformity of SAP and flume fiber.
SAP particle size and PH value requirements
When the particle size is 100~120mesh, the absorption capacity is the best. When PH value is 6~8, the absorption rate is maximum.
SAP of smaller particles may have a negative effect on absorption rate and reosmosis, and also have a tendency to clog pores.
