Improved swellable layer silicates

Details Improved swellable layer silicates Improved swellable layer silicates

C - Chemistry, Metallurgy

01

B

C01B 33/38 (2006.01) C04B 14/20 (2006.01) C02F 1/28 (2006.01) C10M 113/10 (2006.01) C11D 3/12 (2006.01)

Patent

CA 2420937

A swellable layer silicate is described based on smectite or sepiolite/palygorskite for use in media containing di- or polyvalent cations that reduce swellability, characterized by a swelling volume of about 5 to 50 mL, measured by addition of 2 g layer silicate (air-dried) to 100 mL water, and by a fineness of maximum 5 wt.% > 40 µm and maximum 20% > 20 µm, as dry sieve residue.

L'invention concerne un silicate en couche expansif à base de smectite ou de sépiolithe/palygorskite destiné à être employé dans des milieux abaissant le pouvoir expansif, contenant des cations bivalents ou plurivalents. Ledit silicate en couche est caractérisé par un volume d'expansion de 5 à 10 ml, mesuré par addition de 2 g de silicate en couche (absolument sec) à 100 ml d'eau, et par une finesse maximale de 5 % en poids > 40 mu m, ou 20 % > 20 mu m en tant que résidu de criblage à sec.

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