Preparation method for silane or halogenated-silane modified cellulose membrane for separating gases
A technology of gas separation membrane and halosilane, which is applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of restricting the industrial application of mixed matrix membranes, and achieve small industrial restrictions, good permeability, and easy operation. simple effect
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Embodiment 1
[0026] Dissolve 11.2g of cellulose acetate (degree of acetylation DS=2.45) in 80gN,N-dimethylformamide, add 15g of 3-aminopropyldimethylethoxysilane after the dissolution is complete, and keep at 100℃ React for 24h under nitrogen protection. After the reaction, inject the solution into 500 mL of a mixed solution of deionized water and methanol (volume ratio 1:1) to gel, and then wash twice with a mixed solution of methanol and pure water after the gel, until the conductivity of the cleaning solution is less than 20 μs / cm -1 .
[0027] Dissolve the obtained silylated cellulose acetate into N-methylpyrrolidone, then add a certain amount of ethanol to prepare a solution with a polymer concentration of 15%, obtain a homogeneous solution, and leave it for 24 hours to defoam, and then use a metering pump Extruded into the film applicator, the polymer solution is uniformly scraped on the non-woven fabric under the drive of the motor, and the film surface of the nascent film is treated...
Embodiment 2
[0031] 11.2g of cellulose acetate (DS=2.45) was dissolved in 80g of N,N-dimethylformamide, 15g of vinyltriethoxysilane was added after the dissolution was completed, and the reaction was carried out at 100°C under nitrogen protection for 24 hours. After the reaction, the solution was injected into the gel in 500 mL of a mixed solution of deionized water and methanol (volume 1:1), and then washed twice with a mixed solution of methanol and pure water after the gel, until the conductivity of the cleaning solution was less than 20μs / cm -1 .
[0032] The obtained silylated cellulose acetate was dissolved in N-methylpyrrolidone, and then a certain amount of ethanol was added to prepare a solution with a polymer concentration of 30%. After obtaining a homogeneous solution, it was placed for 24 hours to defoam, and then squeezed with a metering pump Out of the film applicator, the polymer solution is uniformly scraped on the non-woven fabric under the drive of the motor. After a dry pr...
Embodiment 3
[0036] Dissolve 22.4 g of cellulose acetate (DS=1.75) in 80 g of N,N-dimethylformamide, add 15 g of trimethylchlorosilane after the dissolution is complete, and react at 50° C. under nitrogen protection for 24 hours. After the reaction, inject the solution into 500mL of a mixed solution of deionized water and methanol (1:1) to gel, and then wash twice with a mixed solution of methanol and pure water after gelation until the conductivity of the cleaning solution is lower than 20μs / cm -1 .
[0037] Dissolve the obtained silylated cellulose acetate into a mixed solution of N-methylpyrrolidone and acetone (3:1), then add a certain amount of ethanol to prepare a solution with a polymer concentration of 25%, and obtain a homogeneous solution Leave it for 24 hours to defoam, and then squeeze it out into the film applicator with a metering pump. Driven by the motor, the polymer solution is uniformly scraped onto the non-woven fabric. After a dry process, the film surface of the nascent fi...
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