Water-absorbing resin is a new functional polymer material that can absorb 100 times or even thousands of times its own weight in water. After it absorbs water and expands, it solidifies with water and becomes a hydrogel with strong water-locking capacity, so that water cannot flow out and will not leak even if it is squeezed hard.
Tissue paper, towels and sponges are materials used to absorb water in daily life.They can only absorb about 20 times their own weight of water, water retention is not strong, and squeezing hard will squeeze out water. In the face of super absorbent resins, they are all small potatoes.They can only absorb about 20 times their own weight of water, water retention is not strong, and squeezing hard will squeeze out water. In the face of highly absorbent resins, they are small players. Similar to paper, cotton, sponge and other materials, the water absorption ability of super absorbent resins is mainly achieved through strong hydrogen bonding between hydrophilic genes such as carboxyl and hydroxyl groups and water molecules. The difference is that the latter has a much higher content of hydrophilic genes available than the former, and the molecular chain lattice structure can be highly expanded to further bind water molecules in it, thus obtaining super-absorbent properties.
The main sources of water-absorbent resins are natural polymers or synthetic polymers. Natural polymers are starch, cellulose, chitosan, etc., i.e. potato starch can be used to prepare water-absorbent resins; synthetic polymers include polyacrylic acid (PAA), polyacrylamide (PAM) and polyvinyl alcohol (PVA).
Water-absorbing resin has strong liquid retention, non-toxicity and irritation, no reaction with human skin contact, and little impact on the environment. Therefore, it is widely used in medical and health care, industry, agriculture, construction and other industries. Among them, medical hygiene includes products such as ice bags and sanitary napkins, including industrial agents such as water-soluble paints and thickeners, and it can also be used as agricultural vegetable preservation materials. Speaking of hygienic materials, we are familiar with face masks and diapers. Yes, face masks and diapers are also used for polyacrylamide (PAM) in water-absorbent resins