KIM, Moo Kon,LEE, Sang Gi,NAM, Hye Mi,LEE, Chang Hun,KIM, Tae Yun
申请号：
EP18871353
公开号：
EP3546503A4
申请日:
2018.10.15
申请国别(地区):
EP
年份:
2019
代理人:
摘要：
The present invention provides a method for preparing a super absorbent polymer which enables production of a super absorbent polymer capable of exhibiting an excellent absorption rate by including a uniform porous structure through a simple and economical process. The method for preparing a super absorbent polymer includes the steps of: performing a crosslinking polymerization of a water-soluble ethylenically unsaturated monomer having an acidic group of which at least a part is neutralized in the presence of an internal crosslinking agent to form a hydrogel polymer containing a first crosslinked polymer； drying and pulverizing the hydrogel polymer； classifying the pulverized polymer into polymer particles having a particle size of at least 10 to 150µm, polymer particles having a particle size of 150 to 200 µm, and polymer particles having a particle size of 200 to 850 µm to form a base polymer powder having a particle size of 150 to 850 µm； and surface-crosslinking the base polymer powder, wherein in the crosslinking polymerization step, the foaming polymerization proceeds in the presence of polymer particles having an average particle size of 10 to 200 µm obtained in the classifying step and an anionic surfactant.
