How do superabsorbent polymers work?


    What is a super absorbent polymer?

    SAP (Super Absorbent Polymer) is classified as hydrogels when cross-linked, absorb aqueous solutions through hydrogen bonding with water molecules. In deionized and distilled water, an SAP may absorb 300-1200 times its weight and can become a gel, but when put into a 0.9% saline solution, the absorbency drops to maybe 50 times its weight.

    The total absorbency and swelling capacity are controlled by the type and degree of cross-linkers used to make the gel. Low-density cross-linked SAPs generally have a higher absorbent capacity and swell to a larger degree. These types of SAPs also have a softer and stickier gel formation. High cross-link density polymers exhibit lower absorbent capacity and swell, but the gel strength is firmer and can maintain particle shape even under modest pressure.

    How does it work?

    It consists of a set of polymeric chains that are parallel to each other and regularly linked to each other by cross-linking agents, thus forming a network.

    When water comes into contact with one of these chains, it is drawn into the molecule by osmosis. Water rapidly migrates into the interior of the polymer network where it is stored.


    Agricultural Grade Applications

    Widely used in agriculture, forestry, and gardening, such as soil water retention agent, seed coating, soil-less cultivation, artificial turf, etc.


    -Improve seed germination and give plants an early, healthy start.

    -Save the irrigation, increase crops and fruit yield.

    -Release the fertilizer efficiency slowly.

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    Hygienic Grade Applications

    Mainly used in Hygiene Products such as Diapers, Sanitary Napkins, Nursing pads, and Pet pads, etc.

    Good Performance In :

    -Absorption Rate

    -Absorption Under Pressure

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    Industrial Grade Applications

    Industrial grade SAP can be mainly used in sandbags, protection materials of concrete, waterproof tape, and waterproof ointment for use in optical fiber cables and so on.

    Other Applications:

    Air Fresher, Cooling Material, Expanding Toys, Additives of Cosmetics, Additives Special Functional Coatings.

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