CN112473403A - High-oleophobic silicon dioxide modified polyacrylonitrile composite membrane and preparation method thereof - Google Patents
High-oleophobic silicon dioxide modified polyacrylonitrile composite membrane and preparation method thereof Download PDFInfo
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- CN112473403A CN112473403A CN202011295559.3A CN202011295559A CN112473403A CN 112473403 A CN112473403 A CN 112473403A CN 202011295559 A CN202011295559 A CN 202011295559A CN 112473403 A CN112473403 A CN 112473403A
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Abstract
The invention relates to the technical field of polyacrylonitrile and discloses a high-oleophobic silica modified polyacrylonitrile composite membrane, which is characterized in that acyl chloride silica is obtained by treating succinic acid and thionyl chloride, then the acyl chloride silica is reacted with 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical to obtain functional silica, bromine-terminated polyacrylonitrile with bromine atoms as end groups is obtained by atom transfer free radical polymerization, the silica is successfully grafted into a polyacrylonitrile matrix by atom transfer nitroxide radical coupling reaction, the agglomeration phenomenon is reduced, the surface contact angle of the polyacrylonitrile porous membrane is reduced by the silica, the hydrophilicity of the porous membrane is improved, the porosity of the porous membrane is improved, the osmotic resistance of the porous membrane is reduced, the porous membrane has excellent water flux, and the anti-pollution performance of the porous membrane is improved, endows the silicon dioxide modified polyacrylonitrile composite membrane with high oleophobic property with excellent hydrophilic oleophobic property.
Description
Technical Field
The invention relates to the technical field of polyacrylonitrile, in particular to a silica modified polyacrylonitrile composite membrane with high oleophobic property and a preparation method thereof.
Background
Polyacrylonitrile has good chemical stability and is widely applied to preparation of porous membranes, but polyacrylonitrile porous membranes have low water flux and poor anti-pollution performance, so that the application of the polyacrylonitrile porous membranes in the field of separation membranes is limited, the polyacrylonitrile porous membranes are required to be modified, general modification modes comprise adsorption, surface grafting, inorganic nanoparticles and the like, the hydrophilicity and the lipophobicity of the polyacrylonitrile porous membranes are improved, the permeability and the anti-pollution capacity of the membranes are improved, and the modification of the inorganic nanoparticles is one of the most effective modes.
The nano-silica has an ultra-high specific surface area, excellent hydrophilicity and oil resistance, and can be used for improving the hydrophilicity and the oil resistance of the polyacrylonitrile porous membrane, but the nano-silica is agglomerated in a polyacrylonitrile matrix solution, so that the hydrophilicity and the oil resistance of the polyacrylonitrile porous membrane are influenced.
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a silica modified polyacrylonitrile composite membrane with high oleophobic property and a preparation method thereof, which solves the problems that the polyacrylonitrile porous membrane has poor hydrophilic and oleophobic properties and silica is easy to agglomerate.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a silica-modified polyacrylonitrile composite membrane with high oleophobicity comprises the following steps:
(1) adding ethanol and DL-tartaric acid into a reaction bottle, uniformly dispersing, adding ammonia water, placing into a magnetic stirring device, slowly dropwise adding tetraethoxysilane under the stirring state, wherein the mass ratio of DL-tartaric acid to tetraethoxysilane is 2-3:100, standing for 8-12h, filtering, washing with deionized water, and drying to obtain tubular nano silicon dioxide;
(2) adding acetonitrile and succinic acid serving as solvents into a reaction bottle, uniformly dispersing, heating, refluxing and dissolving, adding acetonitrile solution of tubular nano-silica, stirring and reacting at 60-90 ℃ for 18-36h, performing suction filtration, washing with deionized water and absolute ethyl alcohol, drying, and performing thionyl chloride treatment to obtain acyl chloride tubular nano-silica;
(3) in argon atmosphere, adding solvents of anhydrous tetrahydrofuran, triethylamine, 4-dimethylaminopyridine and 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical into a reaction bottle, placing the reaction bottle in a salt bath, adding acyl chloride tubular nano-silica, uniformly dispersing, carrying out reflux reaction at 60-90 ℃ for 30-60h, filtering, washing and drying to obtain functional tubular nano-silica;
(4) in argon atmosphere, adding cuprous bromide, pentamethyldiethylenetriamine, methyl 2-bromopropionate and acrylonitrile into a reaction bottle, stirring to react for 1-3h, adding tetrahydrofuran and neutral alumina to remove the cuprous bromide, then placing the mixture into methanol for precipitation, filtering and drying to obtain bromine-terminated polyacrylonitrile;
(5) adding solvents of anhydrous toluene, cuprous bromide, pentamethyldiethylenetriamine, functionalized tubular nano-silica and bromine-terminated polyacrylonitrile into a reaction bottle in an argon atmosphere, stirring and reacting for 72-120h at 80-110 ℃, adding tetrahydrofuran for diluting, filtering, washing and drying, adding N, N-dimethylacetamide, uniformly dispersing, scraping a primary membrane on a glass plate, and placing in dilute hydrochloric acid for gel curing to obtain the silica modified polyacrylonitrile composite membrane with high oleophobic property.
Preferably, the magnetic stirring device in the step (1) comprises a main body, a motor is movably connected to the bottom of the main body, a driving wheel is movably connected to the top of the motor, a partition plate is movably connected to the middle of the main body, a fixed shaft is movably connected to the bottom of the partition plate, a driven wheel is movably connected to the bottom of the fixed shaft, a driven wheel is movably connected to the left of the driven wheel, a magnet is movably connected to the right of the driven wheel, and a beaker is movably connected to the top of the partition plate.
Preferably, the mass ratio of the succinic acid, the tubular nano-silica and the thionyl chloride in the step (2) is 2-4:1: 130-230.
Preferably, the mass ratio of triethylamine, 4-dimethylaminopyridine, 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl radical and acyl chloride tubular nano-silica in the step (3) is 120-180:12-18:150-230: 100.
Preferably, the mass ratio of the cuprous bromide, the pentamethyldiethylenetriamine, the methyl 2-bromopropionate and the acrylonitrile in the step (4) is 2-3.5:2.5-4:2.5-4: 100.
Preferably, in the step (5), the mass ratio of the cuprous bromide, the pentamethyldiethylenetriamine, the functionalized tubular nano-silica and the bromine-terminated polyacrylonitrile is 2.5-4:3.5-5:20-30: 100.
(III) advantageous technical effects
Compared with the prior art, the invention has the following beneficial technical effects:
the high oleophobic silica modified polyacrylonitrile composite membrane is characterized in that in an alkaline environment, DL-tartaric acid is used as a template agent, tetraethoxysilane is used as a silicon source to obtain tubular nano-silica with rich hydroxyl groups, the hydroxyl groups on the tubular nano-silica and succinic acid are subjected to esterification reaction to obtain carboxylated tubular nano-silica with rich carboxyl groups, the carboxyl groups on the carboxylated tubular nano-silica and thionyl chloride are subjected to acyl chlorination reaction to obtain acyl chlorinated tubular nano-silica, acyl chloride groups on the tubular nano-silica and the hydroxyl groups on a 4-hydroxyl-2, 2,6, 6-tetramethyl piperidine 1-oxyl free radical are subjected to esterification reaction to obtain functionalized tubular nano-silica containing rich nitrogen oxygen free radicals, and the functionalized tubular nano-silica is subjected to efficient atom transfer radical polymerization under the action of cuprous bromide serving as a catalyst and methyl 2-bromopropionate serving as an initiator, the acrylonitrile monomer is copolymerized to obtain the bromine atom terminated bromopolyacrylonitrile, and further, under the action of the cuprous bromide catalyst, the nitroxide free radical on the functionalized tubular nano-silica and the bromine atom of the bromine atom terminated bromopolyacrylonitrile generate atom transfer nitroxide free radical coupling reaction, and the tubular nano-silica is successfully grafted to a polyacrylonitrile substrate, so that the interface compatibility of the tubular nano-silica and the polyacrylonitrile is improved, the tubular nano-silica is uniformly dispersed in the polyacrylonitrile substrate, and the agglomeration phenomenon is reduced.
The silica modified polyacrylonitrile composite membrane with high oleophobic property has the unique nano-tubular shape of silica, has an ultra-high specific surface area, is beneficial to the rapid passing of water molecules, and through covalent grafting, the tubular nano-silica is uniformly dispersed in a polyacrylonitrile matrix, so that the asymmetric pore channel structure of a polyacrylonitrile porous membrane is changed, a vertical rod-shaped pore is formed, the permeation channel of the water molecules is shortened, the silica is partially segregated to the polyacrylonitrile porous membrane, the number of hydrophilic functional groups-OH on the surface of the polyacrylonitrile porous membrane is increased, the surface contact angle of the polyacrylonitrile porous membrane is reduced, the hydrophilicity of the polyacrylonitrile porous membrane is improved, the porosity of the polyacrylonitrile porous membrane is improved at the same time, the polyacrylonitrile porous membrane has an abundant pore structure, and the hydrophilic groups on the surface of the silica reduce the interaction force between a polyacrylonitrile molecular chain and a solvent, therefore, the permeation resistance of the porous membrane is reduced, the polyacrylonitrile porous membrane has excellent water flux, the pollution resistance of the polyacrylonitrile porous membrane is improved, and the silica modified polyacrylonitrile composite membrane with high oleophobic property has excellent hydrophilic oleophobic property.
Drawings
FIG. 1 is a schematic structural view of a magnetic stirring apparatus;
FIG. 2 is a first schematic view of a gear structure;
fig. 3 is a schematic view of a gear structure two.
1. A main body; 2. a motor; 3. a driving wheel; 4. a partition plate; 5. a fixed shaft; 6. a driven wheel; 7. a driven wheel; 8. a magnet; 9. and (4) a beaker.
Detailed Description
To achieve the above object, the present invention provides the following embodiments and examples: a preparation method of a silica modified polyacrylonitrile composite membrane with high oleophobicity comprises the following steps:
(1) adding ethanol and DL-tartaric acid into a reaction bottle, uniformly dispersing, adding ammonia water, placing the reaction bottle in a magnetic stirring device, wherein the magnetic stirring device comprises a main body, the bottom of the main body is movably connected with a motor, the top of the motor is movably connected with a driving wheel, the middle of the main body is movably connected with a partition plate, the bottom of the partition plate is movably connected with a fixed shaft, the bottom of the fixed shaft is movably connected with a driven wheel, the left side of the driven wheel is movably connected with a driven wheel, the right side of the driven wheel is movably connected with a magnet, the top of the partition plate is movably connected with a beaker, and tetraethoxysilane is slowly dripped under the stirring state, wherein the mass ratio of DL-tartaric acid to tetraethoxysilane is 2-3:100, standing for 8-12h, filtering;
(2) adding solvents acetonitrile and succinic acid into a reaction bottle, uniformly dispersing, heating, refluxing and dissolving, adding acetonitrile solution of tubular nano-silica, stirring and reacting for 18-36h at 60-90 ℃, performing suction filtration, washing with deionized water and absolute ethyl alcohol, drying, and treating with thionyl chloride, wherein the mass ratio of the succinic acid to the tubular nano-silica to the thionyl chloride is 2-4:1: 130-;
(3) adding solvent anhydrous tetrahydrofuran, triethylamine, 4-dimethylaminopyridine, 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical into a reaction bottle in argon atmosphere, placing the reaction bottle in a salt bath, adding acyl chloride tubular nano-silica, wherein the mass ratio of the triethylamine, the 4-dimethylaminopyridine, the 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical to the acyl chloride tubular nano-silica is 120-;
(4) in argon atmosphere, adding cuprous bromide, pentamethyldiethylenetriamine, 2-bromopropionic acid methyl ester and acrylonitrile into a reaction bottle, wherein the mass ratio of the cuprous bromide to the pentamethyldiethylenetriamine to the 2-3.5:2.5-4:2.5-4:100, stirring for reaction for 1-3h, adding tetrahydrofuran and neutral alumina to remove the cuprous bromide, then placing the mixture into methanol for precipitation, filtering and drying to obtain bromine-terminated polyacrylonitrile;
(5) adding solvent anhydrous toluene, cuprous bromide, pentamethyldiethylenetriamine, functionalized tubular nano-silica and bromine-terminated polyacrylonitrile into a reaction bottle in an argon atmosphere, wherein the mass ratio of the solvent anhydrous toluene to the cuprous bromide to the pentamethyldiethylenetriamine to the functionalized tubular nano-silica to the bromine-terminated polyacrylonitrile is 2.5-4:3.5-5:20-30:100, stirring and reacting for 72-120h at 80-110 ℃, adding tetrahydrofuran for diluting, filtering, washing and drying, adding N, N-dimethylacetamide, dispersing uniformly, scraping a primary membrane on a glass plate, and placing the membrane in dilute hydrochloric acid for gel curing to obtain the silica modified polyacrylonitrile composite membrane with high oleophobic property.
Example 1
(1) Adding ethanol and DL-tartaric acid into a reaction bottle, uniformly dispersing, adding ammonia water, and placing the reaction bottle in a magnetic stirring device, wherein the magnetic stirring device comprises a main body, the bottom of the main body is movably connected with a motor, the top of the motor is movably connected with a driving wheel, the middle of the main body is movably connected with a partition plate, the bottom of the partition plate is movably connected with a fixed shaft, the bottom of the fixed shaft is movably connected with a driven wheel, the left side of the driven wheel is movably connected with a driven wheel, the right side of the driven wheel is movably connected with a magnet, the top of the partition plate is movably connected with a beaker, and tetraethoxysilane is slowly dripped under the stirring state, wherein the mass ratio of DL-tartaric acid to tetraethoxysilane is 2:100, standing for 8 hours;
(2) adding solvents acetonitrile and succinic acid into a reaction bottle, uniformly dispersing, heating, refluxing and dissolving, adding acetonitrile solution of tubular nano-silica, stirring and reacting for 18 hours at 60 ℃, performing suction filtration, washing with deionized water and absolute ethyl alcohol, drying, and performing thionyl chloride treatment, wherein the mass ratio of the succinic acid to the tubular nano-silica to the thionyl chloride is 2:1:130, so as to obtain the acyl chloride tubular nano-silica;
(3) adding solvents of anhydrous tetrahydrofuran, triethylamine, 4-dimethylaminopyridine, 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical into a reaction bottle in an argon atmosphere, placing the reaction bottle in a salt bath, adding acyl chloride tubular nano-silica, wherein the mass ratio of the triethylamine, the 4-dimethylaminopyridine, the 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical to the acyl chloride tubular nano-silica is 120:12:150:100, uniformly dispersing, carrying out reflux reaction at 60 ℃ for 30 hours, filtering, washing and drying to obtain functional tubular nano-silica;
(4) in an argon atmosphere, adding cuprous bromide, pentamethyldiethylenetriamine, methyl 2-bromopropionate and acrylonitrile into a reaction bottle, wherein the mass ratio of the cuprous bromide to the pentamethyldiethylenetriamine to the methyl 2-bromopropionate to the acrylonitrile is 2:2.5:2.5:100, stirring for reaction for 1h, adding tetrahydrofuran and neutral alumina to remove the cuprous bromide, then placing the mixture into methanol for precipitation, filtering and drying to obtain bromoterminated polyacrylonitrile;
(5) adding solvents of anhydrous toluene, cuprous bromide, pentamethyldiethylenetriamine, functionalized tubular nano-silica and bromine-terminated polyacrylonitrile into a reaction bottle in an argon atmosphere, wherein the mass ratio of the anhydrous toluene to the cuprous bromide to the pentamethyldiethylenetriamine to the functionalized tubular nano-silica to the bromine-terminated polyacrylonitrile is 2.5:3.5:20:100, stirring and reacting for 72 hours at 80 ℃, adding tetrahydrofuran for diluting, filtering, washing and drying, adding N, N-dimethylacetamide, uniformly dispersing, scraping a primary membrane on a glass plate, and placing the glass plate in diluted hydrochloric acid for gel curing to obtain the silica modified polyacrylonitrile composite membrane with high oleophobic property.
Example 2
(1) Adding ethanol and DL-tartaric acid into a reaction bottle, uniformly dispersing, adding ammonia water, placing the reaction bottle in a magnetic stirring device, wherein the magnetic stirring device comprises a main body, the bottom of the main body is movably connected with a motor, the top of the motor is movably connected with a driving wheel, the middle of the main body is movably connected with a partition plate, the bottom of the partition plate is movably connected with a fixed shaft, the bottom of the fixed shaft is movably connected with a driven wheel, the left side of the driven wheel is movably connected with a driven wheel, the right side of the driven wheel is movably connected with a magnet, the top of the partition plate is movably connected with a beaker, and tetraethoxysilane is slowly dripped under the stirring state, wherein the mass ratio of DL-tartaric acid to tetraethoxysilane is 2.3:100, standing for 9 hours, filtering;
(2) adding solvents acetonitrile and succinic acid into a reaction bottle, uniformly dispersing, heating, refluxing and dissolving, adding acetonitrile solution of tubular nano-silica, stirring and reacting for 24 hours at 70 ℃, performing suction filtration, washing with deionized water and absolute ethyl alcohol, drying, and performing thionyl chloride treatment, wherein the mass ratio of the succinic acid to the tubular nano-silica to the thionyl chloride is 2.6:1:160, so as to obtain acyl chloride tubular nano-silica;
(3) adding solvents of anhydrous tetrahydrofuran, triethylamine, 4-dimethylaminopyridine, 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical into a reaction bottle in an argon atmosphere, placing the reaction bottle in a salt bath, adding acyl chloride tubular nano-silica, wherein the mass ratio of the triethylamine, the 4-dimethylaminopyridine, the 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical to the acyl chloride tubular nano-silica is 140:14:170:100, uniformly dispersing, carrying out reflux reaction at 70 ℃ for 40 hours, filtering, washing and drying to obtain functional tubular nano-silica;
(4) in an argon atmosphere, adding cuprous bromide, pentamethyldiethylenetriamine, methyl 2-bromopropionate and acrylonitrile into a reaction bottle, wherein the mass ratio of the cuprous bromide to the pentamethyldiethylenetriamine to the methyl 2-bromopropionate to the acrylonitrile is 2.5:3: 100, stirring and reacting for 1.5h, adding tetrahydrofuran and neutral alumina to remove the cuprous bromide, putting the mixture into methanol for precipitation, filtering and drying to obtain bromoterminated polyacrylonitrile;
(5) adding solvents of anhydrous toluene, cuprous bromide, pentamethyldiethylenetriamine, functionalized tubular nano-silica and bromine-terminated polyacrylonitrile into a reaction bottle in an argon atmosphere, wherein the mass ratio of the anhydrous toluene to the cuprous bromide to the pentamethyldiethylenetriamine to the functionalized tubular nano-silica to the bromine-terminated polyacrylonitrile is 3:4:23:100, stirring and reacting for 88 hours at 90 ℃, adding tetrahydrofuran for diluting, filtering, washing and drying, adding N, N-dimethylacetamide, uniformly dispersing, scraping a primary membrane on a glass plate, and placing the membrane in dilute hydrochloric acid for gel curing to obtain the silica modified polyacrylonitrile composite membrane with high oleophobic property.
Example 3
(1) Adding ethanol and DL-tartaric acid into a reaction bottle, uniformly dispersing, adding ammonia water, placing the reaction bottle in a magnetic stirring device, wherein the magnetic stirring device comprises a main body, the bottom of the main body is movably connected with a motor, the top of the motor is movably connected with a driving wheel, the middle of the main body is movably connected with a partition plate, the bottom of the partition plate is movably connected with a fixed shaft, the bottom of the fixed shaft is movably connected with a driven wheel, the left side of the driven wheel is movably connected with a driven wheel, the right side of the driven wheel is movably connected with a magnet, the top of the partition plate is movably connected with a beaker, and tetraethoxysilane is slowly dripped under the stirring state, wherein the mass ratio of DL-tartaric acid to tetraethoxysilane is 2.6:100, standing for 10 hours, filtering;
(2) adding solvents acetonitrile and succinic acid into a reaction bottle, uniformly dispersing, heating, refluxing and dissolving, adding acetonitrile solution of tubular nano-silica, stirring and reacting for 30 hours at 80 ℃, performing suction filtration, washing with deionized water and absolute ethyl alcohol, drying, and performing thionyl chloride treatment, wherein the mass ratio of the succinic acid to the tubular nano-silica to the thionyl chloride is 3.3:1:190, so as to obtain acyl chloride tubular nano-silica;
(3) adding solvents of anhydrous tetrahydrofuran, triethylamine, 4-dimethylaminopyridine, 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical into a reaction bottle in an argon atmosphere, placing the reaction bottle in a salt bath, adding acyl chloride tubular nano-silica, wherein the mass ratio of the triethylamine, the 4-dimethylaminopyridine, the 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical to the acyl chloride tubular nano-silica is 160:16:200:100, uniformly dispersing, carrying out reflux reaction at 80 ℃ for 50 hours, filtering, washing and drying to obtain functional tubular nano-silica;
(4) in an argon atmosphere, adding cuprous bromide, pentamethyldiethylenetriamine, methyl 2-bromopropionate and acrylonitrile into a reaction bottle, wherein the mass ratio of the cuprous bromide to the pentamethyldiethylenetriamine to the methyl 2-bromopropionate to the acrylonitrile is 3:3.5:3.5:100, stirring for reaction for 2 hours, adding tetrahydrofuran and neutral alumina to remove the cuprous bromide, then placing the mixture into methanol for precipitation, filtering and drying to obtain bromoterminated polyacrylonitrile;
(5) adding solvents of anhydrous toluene, cuprous bromide, pentamethyldiethylenetriamine, functionalized tubular nano-silica and bromine-terminated polyacrylonitrile into a reaction bottle in an argon atmosphere, wherein the mass ratio of the anhydrous toluene to the cuprous bromide to the pentamethyldiethylenetriamine to the functionalized tubular nano-silica to the bromine-terminated polyacrylonitrile is 3.5:4.5:26:100, stirring and reacting for 104 hours at 100 ℃, adding tetrahydrofuran for diluting, filtering, washing and drying, adding N, N-dimethylacetamide, uniformly dispersing, scraping a primary membrane on a glass plate, and placing the glass plate in diluted hydrochloric acid for gel curing to obtain the silica modified polyacrylonitrile composite membrane with high oleophobic property.
Example 4
(1) Adding ethanol and DL-tartaric acid into a reaction bottle, uniformly dispersing, adding ammonia water, and placing the reaction bottle in a magnetic stirring device, wherein the magnetic stirring device comprises a main body, the bottom of the main body is movably connected with a motor, the top of the motor is movably connected with a driving wheel, the middle of the main body is movably connected with a partition plate, the bottom of the partition plate is movably connected with a fixed shaft, the bottom of the fixed shaft is movably connected with a driven wheel, the left side of the driven wheel is movably connected with a driven wheel, the right side of the driven wheel is movably connected with a magnet, the top of the partition plate is movably connected with a beaker, and tetraethoxysilane is slowly dripped under the stirring state, wherein the mass ratio of DL-tartaric acid to tetraethoxysilane is 3:100, standing for 12 hours;
(2) adding solvents acetonitrile and succinic acid into a reaction bottle, uniformly dispersing, heating, refluxing and dissolving, adding acetonitrile solution of tubular nano-silica, stirring and reacting for 36 hours at 90 ℃, performing suction filtration, washing with deionized water and absolute ethyl alcohol, drying, and performing thionyl chloride treatment, wherein the mass ratio of the succinic acid to the tubular nano-silica to the thionyl chloride is 4:1:230, so as to obtain acyl chloride tubular nano-silica;
(3) adding solvents of anhydrous tetrahydrofuran, triethylamine, 4-dimethylaminopyridine, 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical into a reaction bottle in an argon atmosphere, placing the reaction bottle in a salt bath, adding acyl chloride tubular nano-silica, wherein the mass ratio of the triethylamine, the 4-dimethylaminopyridine, the 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical to the acyl chloride tubular nano-silica is 180:18:230:100, uniformly dispersing, carrying out reflux reaction at 90 ℃ for 60 hours, filtering, washing and drying to obtain functional tubular nano-silica;
(4) in an argon atmosphere, adding cuprous bromide, pentamethyldiethylenetriamine, methyl 2-bromopropionate and acrylonitrile into a reaction bottle, wherein the mass ratio of the cuprous bromide to the pentamethyldiethylenetriamine to the methyl 2-bromopropionate to the acrylonitrile is 3.5:4:4:100, stirring for reaction for 3 hours, adding tetrahydrofuran and neutral alumina to remove the cuprous bromide, then placing the mixture into methanol for precipitation, filtering and drying to obtain bromine-terminated polyacrylonitrile;
(5) adding solvents of anhydrous toluene, cuprous bromide, pentamethyldiethylenetriamine, functionalized tubular nano-silica and bromine-terminated polyacrylonitrile into a reaction bottle in an argon atmosphere, wherein the mass ratio of the anhydrous toluene to the cuprous bromide to the pentamethyldiethylenetriamine to the functionalized tubular nano-silica to the bromine-terminated polyacrylonitrile is 4:5:30:100, stirring and reacting for 120h at 110 ℃, adding tetrahydrofuran for diluting, filtering, washing and drying, adding N, N-dimethylacetamide, uniformly dispersing, scraping a primary membrane on a glass plate, and placing the membrane in dilute hydrochloric acid for gel curing to obtain the silica modified polyacrylonitrile composite membrane with high oleophobic property.
Comparative example 1
(1) Adding ethanol and DL-tartaric acid into a reaction bottle, uniformly dispersing, adding ammonia water, and placing the reaction bottle in a magnetic stirring device, wherein the magnetic stirring device comprises a main body, the bottom of the main body is movably connected with a motor, the top of the motor is movably connected with a driving wheel, the middle of the main body is movably connected with a partition plate, the bottom of the partition plate is movably connected with a fixed shaft, the bottom of the fixed shaft is movably connected with a driven wheel, the left side of the driven wheel is movably connected with a driven wheel, the right side of the driven wheel is movably connected with a magnet, the top of the partition plate is movably connected with a beaker, and tetraethoxysilane is slowly dripped under the stirring state, wherein the mass ratio of DL-tartaric acid to tetraethoxysilane is 1:100, standing for 10 hours;
(2) adding solvents acetonitrile and succinic acid into a reaction bottle, uniformly dispersing, heating, refluxing and dissolving, adding acetonitrile solution of tubular nano-silica, stirring and reacting for 24 hours at 75 ℃, performing suction filtration, washing with deionized water and absolute ethyl alcohol, drying, and performing thionyl chloride treatment, wherein the mass ratio of the succinic acid to the tubular nano-silica to the thionyl chloride is 1:1:100, so as to obtain the acyl chloride tubular nano-silica;
(3) adding solvents of anhydrous tetrahydrofuran, triethylamine, 4-dimethylaminopyridine, 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical into a reaction bottle in an argon atmosphere, placing the reaction bottle in a salt bath, adding acyl chloride tubular nano-silica, wherein the mass ratio of the triethylamine, the 4-dimethylaminopyridine, the 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical to the acyl chloride tubular nano-silica is 100:10:130:100, uniformly dispersing, carrying out reflux reaction at 75 ℃ for 45 hours, filtering, washing and drying to obtain functional tubular nano-silica;
(4) in an argon atmosphere, adding cuprous bromide, pentamethyldiethylenetriamine, methyl 2-bromopropionate and acrylonitrile into a reaction bottle, wherein the mass ratio of the cuprous bromide to the pentamethyldiethylenetriamine to the methyl 2-bromopropionate to the acrylonitrile is 1.5:2:2:100, stirring for reaction for 2 hours, adding tetrahydrofuran and neutral alumina to remove the cuprous bromide, then placing the mixture into methanol for precipitation, filtering and drying to obtain bromine-terminated polyacrylonitrile;
(5) adding solvents of anhydrous toluene, cuprous bromide, pentamethyldiethylenetriamine, functionalized tubular nano-silica and bromine-terminated polyacrylonitrile into a reaction bottle in an argon atmosphere, wherein the mass ratio of the anhydrous toluene to the cuprous bromide to the pentamethyldiethylenetriamine to the functionalized tubular nano-silica to the bromine-terminated polyacrylonitrile is 2:3:15:100, stirring and reacting for 96 hours at 90 ℃, adding tetrahydrofuran for diluting, filtering, washing and drying, adding N, N-dimethylacetamide, uniformly dispersing, scraping a primary membrane on a glass plate, and placing the membrane in dilute hydrochloric acid for gel curing to obtain the silica modified polyacrylonitrile composite membrane with high oleophobic property.
The silica-modified polyacrylonitrile composite membranes with high oleophobicity obtained in examples and comparative examples were cut into appropriate shapes and sizes, placed in pure water, and tested for water flux using a HK-CLFL type cross-flow filter.
The silica-modified polyacrylonitrile composite membranes with high oleophobicity obtained in the examples and comparative examples were cut into appropriate shapes and sizes, placed in a 0.5g/L bovine serum albumin solution, and tested for bovine serum albumin solution flux using an HK-CLFL type cross-flow filter.
Claims (6)
1. A silica modified polyacrylonitrile complex film with high oleophobic property is characterized in that: the preparation method of the high-oleophobic silicon dioxide modified polyacrylonitrile composite membrane comprises the following steps:
(1) adding DL-tartaric acid into ethanol, dispersing uniformly, adding ammonia water, placing in a magnetic stirring device, slowly dropwise adding tetraethoxysilane under the stirring state, wherein the mass ratio of DL-tartaric acid to tetraethoxysilane is 2-3:100, and standing for 8-12h to obtain tubular nano silicon dioxide;
(2) adding succinic acid into acetonitrile serving as a solvent, uniformly dispersing, heating, refluxing and dissolving, adding acetonitrile solution of tubular nano-silica, stirring and reacting at 60-90 ℃ for 18-36h, and treating by thionyl chloride to obtain acyl chloride tubular nano-silica;
(3) adding triethylamine, 4-dimethylaminopyridine and 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl free radical into solvent anhydrous tetrahydrofuran in argon atmosphere, placing the mixture into a ice salt bath, adding acyl chlorinated tubular nano-silica, uniformly dispersing, and carrying out reflux reaction at 60-90 ℃ for 30-60h to obtain functionalized tubular nano-silica;
(4) in argon atmosphere, adding pentamethyldiethylenetriamine, 2-bromomethyl propionate and acrylonitrile into cuprous bromide, and stirring to react for 1-3h to obtain bromine-terminated polyacrylonitrile;
(5) in argon atmosphere, adding cuprous bromide, pentamethyldiethylenetriamine, functionalized tubular nano-silica and bromine-terminated polyacrylonitrile into anhydrous toluene serving as a solvent, stirring and reacting for 72-120h at the temperature of 80-110 ℃, adding N, N-dimethylacetamide, uniformly dispersing, scraping a primary membrane on a glass plate, and placing in dilute hydrochloric acid for gel curing to obtain the silica modified polyacrylonitrile composite membrane with high oleophobic property.
2. The high-oleophobic silica-modified polyacrylonitrile composite membrane according to claim 1, characterized in that: the magnetic stirring device in the step (1) comprises a main body, wherein the bottom of the main body is movably connected with a motor, the top of the motor is movably connected with a driving wheel, the middle of the main body is movably connected with a partition plate, the bottom of the partition plate is movably connected with a fixed shaft, the bottom of the fixed shaft is movably connected with a driven wheel, the left side of the driven wheel is movably connected with a driven wheel, the right side of the driven wheel is movably connected with a magnet, and the top of the partition plate is movably.
3. The high-oleophobic silica-modified polyacrylonitrile composite membrane according to claim 1, characterized in that: the mass ratio of the succinic acid, the tubular nano-silica and the thionyl chloride in the step (2) is 2-4:1: 130-230.
4. The high-oleophobic silica-modified polyacrylonitrile composite membrane according to claim 1, characterized in that: the mass ratio of triethylamine, 4-dimethylaminopyridine, 4-hydroxy-2, 2,6, 6-tetramethylpiperidine 1-oxyl radical and acyl chloride tubular nano-silica in the step (3) is 120-180:12-18:150-230: 100.
5. The high-oleophobic silica-modified polyacrylonitrile composite membrane according to claim 1, characterized in that: in the step (4), the mass ratio of cuprous bromide, pentamethyldiethylenetriamine, methyl 2-bromopropionate and acrylonitrile is 2-3.5:2.5-4:2.5-4: 100.
6. The high-oleophobic silica-modified polyacrylonitrile composite membrane according to claim 1, characterized in that: in the step (5), the mass ratio of the cuprous bromide, the pentamethyldiethylenetriamine, the functionalized tubular nano-silica and the bromine-terminated polyacrylonitrile is 2.5-4:3.5-5:20-30: 100.
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| CN113262651A (en) * | 2021-05-24 | 2021-08-17 | 武汉钜能科技有限责任公司 | Modified polyacrylonitrile ultrafiltration membrane applied to removing phosphate in water and preparation method thereof |
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| CN113262651A (en) * | 2021-05-24 | 2021-08-17 | 武汉钜能科技有限责任公司 | Modified polyacrylonitrile ultrafiltration membrane applied to removing phosphate in water and preparation method thereof |
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