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Sanitary Napkins Absorb Resin
Sanitary napkins mainly include surface layer, absorption core, bottom three layers of structure, each layer of materials with hot melt adhesive bonding. The outermost layer (i.e. the bottom layer) is nonwoven, and the material is soft. Inside is a leak-proof film (composed of waterproof paper or polyethylene film). Then inside is the toilet paper wrapped with polymer water absorbent fluff pulp, forming a strong absorber, once the menstrual blood infiltrates this layer, it will be firmly attached, will not reverse or scatter
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.
—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.
sanitary towel is a kind of sanitary products used by women during menstruation. The main material is polymer and polymer composite paper formed by cotton, non-woven fabric, paper pulp or above material complex. The side design is mainly used to prevent side leakage. When using, first tear off the middle of the paper tape, glue the glue side to the middle of the underwear, and stick the two "ears" to the narrowest part of the pants. Other common menstrual products include tampons, menstrual cups, pads, etc. In the selection of sanitary napkins should pay attention to the material composition, health standards and their own actual situation. When using sanitary napkins, you should pay attention to storage conditions, use health, and pay attention to the frequency of replacement, otherwise it is easy to cause gynecological diseases. As a product for menstrual use, sanitary napkins have encountered a lot of social stigma, and menstrual poverty (that is, it is difficult to obtain sanitary napkins and other supplies) and menstrual shame are widespread in many countries and regions around the world, which has caused trouble to women's education opportunities and living conditions.
