Hyung Ki Yoon,Dae Woo Nam,Hyemin Lee,Chang Sun Han,Sung Jong Seo
申请号：
US15768343
公开号：
US20180318793A1
申请日:
2017.01.03
申请国别(地区):
US
年份:
2018
代理人:
摘要：
The present invention relates to a method for preparing a super absorbent polymer exhibiting improved liquid permeability, gel strength, absorption rate and the like while maintaining excellent absorption performance. The method for preparing the super absorbent polymer comprises the steps of: carrying out a crosslinking polymerization of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups in the presence of an internal crosslinking agent to form a hydrogel polymer including a cross-linked polymer； drying, pulverizing, and classifying the hydrogel polymer to form a base polymer powder； and surface-crosslinking the base polymer powder by using a surface crosslinking liquid containing a surface crosslinking agent of an alkylene carbonate having 2 to 5 carbon atoms, in the presence of hydrophobic silica particles having a water-contact angle of more than 10° and 150° or less and hydrophilic silica particles having a water-contact angle of 10° or less.
