Method for determining properties of superabsorbent polymer particles and of absorbent structures containing such particles

摘要

A method for determining the time dependent effective permeability and the uptake kinetics of hydrogel-forming superabsorbent polymer particles under pressure.

主权项

1. A method for determining the time dependent effective permeability and the uptake kinetics under pressure of superabsorbent polymer particles or an absorbent structure comprising superabsorbent polymer particles, the method comprising the steps of:
a. providing dry, non-preswollen, non pre-wetted superabsorbent polymer particles on a screen to form a layer on the screen, wherein the bottom of the screen has pores, the pores having a dimension to allow liquid to pass through and to hinder the superabsorbent polymer particles from passing through; b. applying a weight onto the surface of the superabsorbent polymer particles layer; c. introducing a flow of hydrophilic liquid onto the surface of the superabsorbent polymer particles layer; and d. measuring and recording the weight of liquid passing through the superabsorbent polymer particles layer and the caliper of the superabsorbent polymer particles layer.