Absorbent gelling material comprising a dry mixture of at...

Details Absorbent gelling material comprising a dry mixture of at... Absorbent gelling material comprising a dry mixture of at...

B - Operations, Transporting

01

J

B01J 20/26 (2006.01) A61L 15/22 (2006.01) A61L 15/42 (2006.01) A61L 15/60 (2006.01) B01J 20/30 (2006.01) C08L 101/14 (2006.01) A61F 13/15 (2006.01)

Patent

CA 2192805

By mixing two types of hydrogel-forming particles having different Absorption Against Pressure values, a synergistic effect can be obtained wherein the AAP- value of the mixture is higher than would be expected on the basis of the weight fractions of the components of the mixture. By mixing two types of hydrogel-forming particles having different Teabag Centrifuge Capacity values and equal AAP values, an unexpected increase in the AAP value of the mixture is observed. A method of manufacturing the absorbing gelling material according to the invention comprises the steps of: providing a first type of hydrogel-forming material and a second type of hydrogel-forming material; introducing both types of hydrogel-forming material in a mixing means; and mixing both types of hydrogel-forming particles to form the mixture. Both types of hydrogel-forming material may be formed by a separate polymerisation process in separate batches, followed by mixing the two types of hydrogel- forming particles. Alternatively, a weight fraction of a single type of hydrogel-forming material may be separated from the bulk of the material, may subsequently be treated to increase the AAP value thereof, and may be mixed back into the bulk material.

On peut obtenir un effet synergique en mélangeant deux types de particules formant de l'hydrogel et présentant différentes valeurs d'absorption par rapport à la pression (AAP), lesquelles sont supérieures à celles prévisibles en fonction des rapports pondéraux des composants du mélange. Lorsque l'on mélange deux types de particules formant de l'hydrogel et présentant des valeurs TCC (Teabag Centrifuge Capacity) différentes et des valeurs AAP similaires, on observe une augmentation de la valeur AAP du mélange. Le procédé de fabrication du matériau de gélification selon l'invention consiste à produire un premier et un second types de matériau formant de l'hydrogel, à introduire ces derniers dans un moyen de mélange, et à mélanger les deux types de particules formant de l'hydrogel pour former le mélange. On peut obtenir les deux types de matériau formant de l'hydrogel par un procédé de polymérisation en charges séparées, suivi du mélange des deux types de particules formant de l'hydrogel. On peut également séparer une fraction pondérale d'un seul type de matériau formant de l'hydrogel, la traiter de manière à en augmenter la valeur AAP et la mélanger à nouveau dans le matériau en vrac.

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