processo para produzir um polímero absorvedor de água, dispositivo para secagem de um polímero absorvedor de água, e, uso de um dispositivo

• Main Authors: Dominicus van Esbroeck, Matthias Weismantel, Stefan Bruhns
• Format: Patent
• Language: Portuguese
• Published: 06.06.2017
• 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

processo para produzir um polímiero absorvedor de água, dispositivo para secagem de um polímero absorvedor de água, e, uso de um dispositivo. a invenção refere-se a um método para a produção de polímeros absorvedores de água, por meio de polimerização de uma solução de monômero e secagem do hidrogel assim obtido por meio de um fluxo de gás aquecido, sendo que a secagem é realizada em pelo menos duas zonas de temperatura e/ou o fluxo de gás impinge no hidrogel na seção frontal de uma secadora de esteira em sentido ascendente, e em sentido descendente na seção posterior da secadora de esteira, sendo que a alteração de fluxo ocorre a um teor de água do hidrogel de 15 a 45 % em peso e/ou a camada de hidrogel é pelo menos parcialmente impingida em sentido ascendente, sendo que a velocidade do gás é de 5 a 30 % da velocidade de gás necessária para erguer o hidrogel da esteira. a invenção refere-se adicionalmente a um dispositivo para realizar referido método e ao uso dos polímeros absorvedores de água produzidos por meio de referido método na produção de artigos de higiene. Preparation of water-absorbing polymers (A) with drying quality index comprises polymerizing a monomer solution and drying the obtained hydrogel agent in hot-gas flow, where the drying process takes place in at least two temperature zones, when the flow of the hydrogel in the gas flow is: downwards in the front side of the volume drier, and upwards against the rear side of the drier; where the amount of water in the hydrogel is 15-45 wt.%, the hydrogel layer in the volume drier flows at least partially against down wards, and the speed of the gas is 5-30%. Preparation of water-absorbing polymers (A) with drying quality index comprises polymerizing a monomer solution and drying the obtained hydrogel agent in hot-gas flow, where the drying process takes place in at least two temperature zones, when the gas inlet temperature (T n) is not equal to T n + a; and flow of the hydrogel in the gas flow is: downwards in the front side of the volume drier, and upwards against the rear side of the drier; where the amount of water in the hydrogel is 15-45 wt.%, the hydrogel layer in the volume drier flows at least partially against down wards, and the speed of the gas is 5-30%. n : index; and a : greater than 0. An independent claim is included for a device for drying (A) comprising a gas permeable conveyer belt (which is streamed by a preheated gas), where the gas inlet temperature is adjusted such that it can come form at least two temperature zones.