Method and device for determining the swelling behavior of polymer gels under pressure

US7189575B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Wolfgang Schrof · Neuleiningen, DE
• Udo Gödert · Ebertsheim, DE
• Martin H. Beck · Amherst, US
• Hans-Joachim Hähnle · Neustadt, DE
• Gunnar Schornick · Neuleiningen, DE

Key dates

• Filing date: Nov 8, 2001
• Grant date: Mar 13, 2007
• Expiry date: Apr 27, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N19/10
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Disclosed is a method for determining the swellability and the swelling kinetics of superabsorbent material (9) such as polymer gels, for example, which comprises introducing a defined volume of the dry superabsorbent material (9) into a measuring vessel (7), using a movable element (4) within said measuring vessel (7) to apply a restraining force (12) to said superabsorbent material (9) and capturing the expansion of said superabsorbent material (9) contactlessly within a chamber (14) in a continuous manner by capturing the change in height of a piston (4) which bounds said chamber (14), travels in a measuring vessel (7) and is marked with a height scale (6).