Method for production of water-absorbing polymers

• Main Authors: BRUHNS STEFAN, VAN ESBROECK DOMINICUS, WEISMANTEL MATTHIAS
• Format: Patent
• Language: Chinese; English
• Published: 29.12.2010
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BLASTING; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES; CHEMISTRY; COMPOSITIONS BASED THEREON; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; DRYING; DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM; GENERAL PROCESSES OF COMPOUNDING; HEATING; HUMAN NECESSITIES; HYGIENE; LIGHTING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES; MECHANICAL ENGINEERING; MEDICAL OR VETERINARY SCIENCE; METALLURGY; METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WEAPONS; WORKING-UP

The invention relates to a method for production of water-absorbing polymers, by polymerisation of a monomer solution and drying the hydrogel thus obtained by means of a heated gas flow, whereby the drying is carried out in at least two temperature zones and/or the gas flow impinges on the hydrogel in the front section of a belt dryer from below and from above in the back section of the belt dryer, whereby the flow change occurs with a water content of the hydrogel of 15 to 45 wt. % and/or the hydrogel layer is at least partly impinged from below, whereby the gas speed is 5 to 30 % of the gasspeed necessary to lift the hydrogel from the belt. The invention further relates to a device for carrying out said method and the use of the water-absorbing polymers produced by said method in the production of hygiene articles.