PREPARATION METHOD OF A SUPER ABSORBENT POLYMER

摘要

The present invention relates to a method of preparing a super absorbent polymer (SAP), and more specifically to a method of preparing a SAP including the steps of spraying the monomer composition on a substrate having a hydrophobic surface of a certain tan angle and carrying out a UV polymerization on a polymerization reactor having a slightly hydrophilic surface. The present invention can improve the conversion rate of polymerization because the shape of the monomer solution is changed from prior sheet form to droplet form so that UV rays reach the deeper layer of the droplets, can minimize or simplify the recycling process because it is easy to control the particles of the prepared polymer, and can provides the SAP of high caliber by narrowing the particle diameter distribution and improving the uniformity.

主权项

1. A method of preparing a super absorbent polymer (SAP), including the steps of:
preparing a monomer composition including a water-soluble ethylenic unsaturated monomer and a polymerization initiator; preparing a monomer mixture of fine droplet having the sprayed droplet size of 300 μm or less by spraying said monomer composition on a substrate having a hydrophilic surface connected with a polymerization reactor; preparing a fine hydrogel polymer by polymerizing said monomer mixture of fine droplet on a continuously moving polymerization reactor with UV rays; and drying said fine hydrogel polymer, wherein the substrate having the hydrophilic surface has the tan q value of 20° to 70° to the polymerization reactor.