A kind of preparation method of silane or halogenated silane modified cellulose gas separation membrane
A technology of gas separation membrane and halosilane, which is applied in semipermeable 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 (acetylation degree of substitution DS=2.45) in 80g of N,N-dimethylformamide, add 15g of 3-aminopropyldimethylethoxysilane after the dissolution is complete, Under the protection of nitrogen, the reaction was carried out for 24h. 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 the gel twice with a mixed solution of methanol and pure water until the conductivity of the cleaning solution is lower than 20 μs / cm.
[0027] Dissolve the obtained silylated cellulose acetate into N-methylpyrrolidone, then add a certain amount of ethanol to form a solution with a polymer mass concentration of 15%, and obtain a homogeneous solution, place it for 24 hours for defoaming, and then use a metering pump Extruded into the film applicator, driven by the motor, the polymer solution is evenly scraped and coated on the non-woven fabric, and after a dry proce...
Embodiment 2
[0031] Dissolve 11.2 g of cellulose acetate (DS=2.45) in 80 g of N,N-dimethylformamide, add 15 g of vinyltriethoxysilane after the dissolution is complete, and react at 100°C for 24 hours under nitrogen protection. After the reaction, inject the solution into 500 mL of a mixed solution of deionized water and methanol (volume 1:1) to gel, and then wash the gel twice with a mixed solution of methanol and pure water until the conductivity of the cleaning solution is lower than 20 μs / cm.
[0032] Dissolve the obtained silylated cellulose acetate in N-methylpyrrolidone, then add a certain amount of ethanol to make a solution with a polymer concentration of 30%, obtain a homogeneous solution, place it for 24 hours for defoaming, and then squeeze it out with a metering pump After going out to the film applicator, the polymer solution is evenly scraped and coated on the non-woven fabric under the drive of the motor. After a dry process, the film surface of the nascent film is treated...
Embodiment 3
[0036] Dissolve 22.4g of cellulose acetate (DS=1.75) in 80g of N,N-dimethylformamide, add 15g of trimethylchlorosilane after the dissolution is complete, and react at 50°C for 24h under nitrogen protection. After the reaction, inject the solution into 500mL of a mixed solution of deionized water and methanol (1:1) to gel, and then wash the gel twice with a mixed solution of methanol and pure water until the conductivity of the cleaning solution is lower than 20μs / cm .
[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 make a solution with a polymer concentration of 25%, and obtain a homogeneous solution Leave it for 24 hours for defoaming, then extrude it into the film applicator with a metering pump, scrape and coat the polymer solution evenly on the non-woven fabric under the drive of the motor, and treat the film surface of the nascent film with an air knife after...
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