Preparation and Properties of Super Absorbent Polymer with High Liquid Permeability
A super absorbent polymer with excellent liquid permeability and liquid absorption performance was synthesized by aqueous solution polymerization using acrylic acid and functional monomer as polymerization monomer,N,N-methylene bisacrylamide as crosslinking agent,and potassium persulfate as initiator.The effects of the amount of self-made functional monomer,the amount of crosslinking agent,the amount of initiator,neutralization degree and initiation temperature on the liquid absorption capacity and liquid permeability of the super absorbent polymer were studied,and the particle morphology of the super absorbent polymer was characterized by scanning electron microscopy.The results show that the optimal synthetic conditions are as follows:the amount of acrylic acid is 250 g,the amount of functional monomer is 25 g,the amount of crosslinking agent is 1.5 g,the amount of initiator is 0.375 g,the amount of sodium hydroxide is 97.2 g,and the initiation temperature is 55℃.The super absorbent polymer prepared under this condition has good liquid absorption and liquid permeability,with the brine absorption ratio is 103.25 g/g,and the liquid permeability speed is 201.55 mL/min.The SEM results show that the surface shape of the super absorbent polymer is more regular because of the increased rigidity of the molecular chain.
super absorbent polymerfunctional polymerhigh-pass liquidacrylic acidcomposite core