08-07-2021 дата публикации
Номер: US20210206938A1
Принадлежит:
A method for producing a porous silicone material including the following steps: 1. A method for producing a porous silicone material , comprising the following steps: A) a silicone base A crosslinkable by polycondensation or polyaddition;', 'B) at least one nonionic silicone surfactant B having a cloud point comprised between 10 and 50° C., preferably between 15 and 45° C.;', 'C) optionally, at least one catalyst C; and', 'D) water;, '1) implementing a direct emulsion E of silicone in water comprising2) heating the emulsion E to a temperature greater than or equal to 60° C. to obtain a porous silicone material; and3) optionally, drying the porous silicone material, preferably by heating.2. Method according to claim 1 , wherein the nonionic silicone surfactant B is an organopolysiloxane-polyoxyalkylene copolymer claim 1 , preferably comprising siloxyl units having sequences of ethylene oxide chains claim 1 , and claim 1 , optionally claim 1 , sequences of propylene oxide chains.4. Method according to claim 1 , wherein the emulsion E comprises between 0.1 and 70% by mass of surfactant B relative to the total mass of silicone base contained in the emulsion claim 1 , preferably between 0.5 and 50% claim 1 , more preferably between 1 and 25% claim 1 , and even more preferably between 2 and 20%.5. Method according to claim 1 , wherein the emulsion E comprises between 10 and 80% of water by mass relative to the total mass of the emulsion claim 1 , preferably between 30 and 75% claim 1 , and even more preferably between 35 and 65%.6. Method according to claim 1 , wherein the silicone base A is crosslinkable by polyaddition and wherein the silicone base A comprises:at least one organopolysiloxane A1 comprising, per molecule, at least 2 alkenyl or alkynyl groups, linear or branched, having from 2 to 6 carbon atoms, andat least one organohydrogenpolysiloxane A2 comprising, per molecule, at least 2 silyl hydride functions Si—H.7. Method according to claim 1 , wherein the ...
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