08-09-2022 дата публикации
Номер: US20220280918A1
Принадлежит:
Sorbent polymer composites and a solution-casting method of making hydrophobic sorbent polymer composites for CO2 adsorption applications are described. The sorbent polymer composites are comprised of a polymer matrix, a dispersed CO2 sorbent, and an optional filler particle for hydrophobicity modification. 1. A method of making a sorbent polymer composite membrane , comprising: mixing a dissolved fluoropolymer and a sorbent in an organic solvent to form a mixture;wherein the fluoropolymer and sorbent comprise at least 5 mass % of the mixture;adding a nonsolvent to the mixture to form a phase inversion coating composition;wherein the mass ratio of nonsolvent to solvent in the coating composition is 0.2 or less;applying a film of the coating composition to a substrate via a casting knife;vaporizing the solvent from the film at a temperature <150° C. from the mixture to increase the ratio of nonsolvent/solvent so that the fluoropolymer precipitates from the solvent; andforming a porous fluoropolymer film with dispersed sorbent.2. The method of further comprising drying the porous fluoropolymer film at an elevated temperature above 30° C. to remove the solvent and nonsolvent.3. The method of wherein the elevated temperature is in the range of 30-100° C.4. The method of any of wherein the mixture comprises at least 7 mass % claim 1 , or at least 8 mass % claim 1 , or 8 to 15 mass % claim 1 , or 8 to 10 mass % fluoropolymer plus sorbent.5. The method of any of the above wherein the mixture comprises at least 4 mass % claim 1 , or at least 8 mass % claim 1 , or 8 to 15 mass % claim 1 , or 5 to 20 mass % or 8 to 10 mass % fluoropolymer.6. The method of wherein the coating composition has a mass ratio of nonsolvent/solvent (for example water/acetone) of 0.2 or less claim 1 , or 0.1 or less claim 1 , or in the range of 0.02 to 0.10 claim 1 , or 0.04 to 0.08 or 0.024-0.100.7. The method of wherein the step of vaporizing is conducted at <150 or <100 or <80° C. claim 1 , or in ...
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