Preparation And Property Study Of Salt Resistance Super Absorbent

Superabsorbent polymer hydrogels are lightly crosslinked hydrophilic polymers thatcan absorb, swell and retain aqueous solutions up to hundreds of times their own weight.They are mainly used in sanitary goods for absorbing the body fluids and in soilconditioning and improving water retention capability of soil in agriculture andhorticulture. They are also found to be valuable in some specialized applications,including controlled delivery of bioactive agents. Specifically engineered hydrogels mayact intelligently..At present, the water absorbency of these super-absorbent resins in deionized wateris high. However, it is low in the salt solution, therefore, it is important to increase waterabsorbency of superabsorbent in an unpure water medium for their use. The syntheticcopolymers from a mixed monomer system have been investigated. The result shows thatit possesses excellent characteristics for salt resistant. In the past studies synthesis ofSAP's using diacrylic ester as crosslinked agent also have been reported , this kind ofcrosslinker can introduce hydrophobic ester group and increase the salt tolerance ofsuperabsorbent . In this work, a series of salt resisitant SAPs were synthesized usingself-produced allyl acrylate as crosslinker, as well as their comprehensive properties werestudied. The main contents of this thesis were as follows:Ally acrylate was synthesized by acrylic acid and allyl alcohol, and these polymerswere characterized by H-NMRA series of different superabsorbent were synthesized by aqueous polymerizationusing self-produced ally acrylate as crosslinker agent. The products were characterized byIR TGA, XRD and SEM. various factors that affect absorbing capacity were discussed indetail.The comprehensive properties of the SAPs such as water absorbency, water retention,...