CN102114389A - Silver-loaded nano-titanium dioxide/polrvinyl chloride membrane and preparation method thereof - Google Patents
Silver-loaded nano-titanium dioxide/polrvinyl chloride membrane and preparation method thereof Download PDFInfo
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Abstract
The invention provides a silver-loaded nano-titanium dioxide/polrvinyl chloride membrane and a preparation method thereof. The method comprises the following steps of: dissolving polrvinyl chloride in an N-N-dimethylacetamide solvent; adding silver-loaded nano-titanium dioxide, and immediately adding a dispersant, namely sodium hexametaphosphate; adding a pore-forming agent, namely polyvinylpyrrolidone; standing at the temperature of between 20 and 30 DEG for 1 to 2 days for deaeration; casting deaerated casting solution to form a membrane at the temperature of between 15 and 30 DEG C under the humidity of between 40 and 80 percent; volatizing the casting solution in the air for 10 to 100 seconds after the membrane is cast, slowly placing into ethanol coagulation liquid at the concentration of between 10 and 50 percent and soaking for 12 to 24 hours; and taking the membrane out from the coagulation liquid and rinsing by using distilled water to obtain the silver-loaded nano-titanium dioxide modified polrvinyl chloride separation membrane. By the method, organic membranes are subjected to antibacterial modification, the disinfection and antipollution performance of the membranes can be improved, and the clear water filtration flux of the membranes can be improved.
Description
Technical field
What the present invention relates to is a kind of membrane material based on polyvinyl chloride (PVC), the present invention also relates to a kind of preparation method of film material based on polyvinyl chloride.
Background technology
Membrane separation technique has advantages such as simple, easy to operate, the no phase transformation of equipment, no chemical change, has obtained promotion and application widely in drink water purifying field and sewage disposal and reuse.The membrane material of extensive use at present is mainly some polymer, as Kynoar, polysulfones, polyethylene etc., has micron or nanoscale aperture on the surface, utilizes sieving actoion to hold back suspension, organic pollution and bacterium, virus etc.
General organic film material only has the function of holding back bacterium and does not have antibacterial or bactericidal property.This makes membrane material in water treatment procedure, and the surface is easy to by microbial adhesion, and the biomembrane that bacterium forms and the microbial product of its secretion form the biological pollution layer, and resistance of membrane filtration is increased, and flux reduces.Reasons such as simultaneously inhomogeneous, film surface fracture owing to membrane aperture, bacterium can enter the film chamber by film surface bigger aperture or breakage, breeds in the film chamber, and the biomembrane that bacterium forms and the microbial product of its secretion also can cause the film chamber to be stopped up.Moreover, after membrane for water treatment was covered by the biological pollution layer, microorganism easily saw through film and causes effluent quality to worsen, and makes the filtration water outlet coliform count index exceeding standard of film, influences water quality safety.Handled water is injected chlorine or adds hypochlorite 0.5 * 10
-6Carrying out the chlorination preliminary treatment down is the most frequently used method for disinfection, but chlorine can bring to a certain degree damage to film, and can generate accessory substance in water body; Adopt ultraviolet ray or electronic mycocidal device also can reach bactericidal effect, but this to increase the energy consumption of operation.Solving membrane material cost fundamental way high and that easily pollute is that the preparation cost is low, the film of stable against biological contamination performance.
Although counter-infiltration, NF membrane are used to hold back bacterium because membrane aperture is far smaller than the size of bacterium thalline, these films belong to high-pressure membrane, need higher energy consumption.At present, the low-pressure membrane (ultrafiltration or micro-filtration membrane) with disinfective action does not appear in the newspapers as yet.Therefore, adopt relatively inexpensive film synthetic material, and the film synthetic material is carried out effective biocidal property modification is a kind of urgent novel again key technology.
Summary of the invention
The object of the present invention is to provide a kind of bacteriostasis property good, required driving force is low, can prolong life cycle and life-span, the easy cleaned again Ag-carried nanometer titanium dioxide/polychloroethylene film of saving power consumption.The present invention also aims to provide a kind of preparation method of Ag-carried nanometer titanium dioxide/polychloroethylene film.
The object of the present invention is achieved like this:
The component of Ag-carried nanometer titanium dioxide/polychloroethylene film and content are that all percentages are mass percent:
Polyvinylchloride 7%-13%
Dissolving solventless polyvinyl chloride 60%-90%
Ag-carried nanometer titanium dioxide 0.1%-2%
Calgon or neopelex 0.2%-4%
Pore former 2%-8%.
Ag-carried nanometer titanium dioxide/polychloroethylene film of the present invention can also comprise:
1, described dissolving solventless polyvinyl chloride is N-N dimethylacetylamide, dimethylacetylamide, dimethyl formamide or acetone.
2, described pore former is polyvinylpyrrolidone, polyethylene glycol or perchlorate.
Biocidal property polychloroethylene film of the present invention comprises micro-filtration membrane, milipore filter, reverse osmosis membrane, NF membrane; Flat sheet membrane, tubular membrane, hollow cellulose film, capillary-pipe film or spiral wound membrane.
The preparation method of Ag-carried nanometer titanium dioxide/polychloroethylene film of the present invention is:
A, get polyvinyl chloride and be dissolved in the N-N dimethylacetamide solvent;
B, treat that polyvinyl chloride dissolves the back fully and in the process that stirs, add Ag-carried nanometer titanium dioxide uniformly, add sodium hexametaphosphate dispersant then immediately;
C, add pore former polyvinylpyrrolidone (PVP) again, evenly be stirred to the Ag-carried nanometer titanium dioxide uniform particles and be scattered in the solution;
D, above-mentioned solution are 20-30 ℃ of static placement deaeration in 1-2 days down;
E, the casting solution after the deaeration is watered film under 15-30 ℃, 40%-80% humidity;
F, water film after casting solution in air, volatilize 10-100 after second, put into 10%-50% alcohol solidification liquid at leisure and soaked 12-24 hour;
G, to take out film from solidification liquid clean with the distilled water rinsing, makes Ag-carried nanometer titanium dioxide modified polyvinyl chloride diffusion barrier.
Wherein the mass percent of component consists of: solvent 60%-90%, Ag-carried nanometer titanium dioxide 0.1%-2%, calgon or neopelex 0.2%-4%, the pore former 2%-8% of polyvinyl chloride 8%-13%, dissolving polyvinyl chloride; Described dissolving solventless polyvinyl chloride is N-N dimethylacetylamide, dimethylacetylamide, dimethyl formamide or acetone; Described pore former is polyvinylpyrrolidone, polyethylene glycol or perchlorate.
The present invention carries out the biocidal property modification to organic film, and its purpose is exactly the clear water filtration flux of the improvement sterilization of film and antifouling property, the organic film of raising etc.Characteristics through the improved biocidal property polychloroethylene film of the present invention are:
(1) the Ag-carried nanometer titanium dioxide Modified Membrane has bacteriostasis property
In the embrane method water filtration process, forming pollution layer on the film is that film pollutes modal mode.Pollution layer on the film mainly be since microbial adhesion on film surface and utilize the organic matter growth metabolism in the water to produce, microbial metabolic products such as polysaccharide, protein etc. can further be adsorbed on the film surface, these stickums can make bacterium form zoogloea, thus the vicious circle that causes film to pollute.Thereby, improve the stable against biological contamination of film, can fundamentally solve the membrane pollution problem that in the embrane method water treatment procedure, faces.
The biocidal property of film is tested with inhibition zone and is proved.We use Escherichia coli as the model microorganism, on nutrient agar panel, pass through constant temperature culture, find that Ag-carried nanometer titanium dioxide/PVC film can form tangible inhibition zone, the common PVC film does not then form inhibition zone (as Fig. 2,3), the proof Modified Membrane has extremely strong deactivation to bacterium, and bacterium is difficult in the existence of membrane material surface.
As can be seen from Figure, under illumination condition, the stable against biological contamination of Ag-carried nanometer titanium dioxide/PVC Modified Membrane is stronger.This be because, under the lucifuge condition bacteriostasis property of film be because it can discharge Ag
+Ion
[i]Under illumination condition, TiO
2After obtaining certain energy, very easily in producing hydroxyl radical free radical, well-known hydroxyl radical free radical has very strong oxidation activity, at this moment hydroxyl radical free radical
[ii]And Ag
+Ion works together, thereby stronger bioinactivation effect is arranged.
(2) the Ag-carried nanometer titanium dioxide Modified Membrane is inhibited to the bacterial adhesion growth
On the ultrafiltration cup device, adopt Ag-carried nanometer titanium dioxide polyvinyl chloride flat sheet membrane and blank sample respectively to Escherichia coli bacteria liquid (bacterial content about 10
3CFU/mL) filter, a certain amount of Escherichia coli have all been held back on the milipore filter surface.The film sample was placed the triangular flask that fills fluid nutrient medium static 2 hours then, make Escherichia coli have the sufficient time to breed attached to the film surface.Sample taken out from triangular flask be placed on another group and fill in the triangular flask of fluid nutrient medium and under identical conditions, shake, Escherichia coli attached to the film surface will breed 1 as a child in the liquid medium within, nutrient solution in second group of triangular flask is carried out colony counting method to be detected, found that Escherichia coli quantity obviously is less than blank sample in the Ag-carried nanometer titanium dioxide milipore filter nutrient solution, this no matter be from the bacteria inactivation rate effect of film itself or film to the absorption tendency of microorganism can illustrate Ag-carried nanometer titanium dioxide/PVC film than pure PVC film have more superior biocidal property (as Fig. 4, annotate: in the experiment used reagent and instrument all in advance under identical conditions through sterilization).
(3) the Ag-carried nanometer titanium dioxide Modified Membrane has better crown_interception to bacterium
To carrying silver-colored polychloroethylene film and blank sample colibacillary rejection is advanced modification row mensuration, find that year silver-colored polyethylene film significantly increases the rejection of bacterium.When water inlet Escherichia coli quantity was lower than 100CFU/mL, coliform count was undetected in the water outlet after carrying silver-colored polyethylene film filtration, and Escherichia coli are detected behind blank spline filter.
(4) the Ag-carried nanometer titanium dioxide Modified Membrane has certain stable against biological contamination performance
In addition, we have also done correlative study (institute's filtration surface water is taken from Harbin Engineering University's man-made lake in the school, and turbidity 20NTU, TOC are 5mg/L, and pH 7.4) to the antifouling property of film in filter process.Studies show that the stickums such as the easier adsorb organic compound in film surface of non-modified, these materials can form fine and close pollution layer on the film surface and cause filtration resistance to increase (as Fig. 5, after Fig. 6) this pollution layer forms, membrane flux reduces, operating pressure increases, when having served as filtration resistance power and being increased to a certain degree, must take certain cleaning measure to recover membrane flux and could guarantee to filter and proceeded down.
Film pollutes and generally comprises organic contamination, inorganic pollution and biological pollution.The cleaning method of film generally includes alkali cleaning, acid cleaning etc.Alkali cleans, sour cleaning can remove striping to a great extent organic contamination and inorganic pollution, but general pickling of biological pollution or alkali cleaning all can't effectively be removed.Die all irreclaimable pollution after pickling, the alkali cleaning as the membrane biological pollution deliberated index.We have carried out the test of clear water flux respectively to Modified Membrane before and after cleaning and non-Modified Membrane, measure the membrane flux under the same operating pressure, and compare with the initial flux of new film, are J/J with the membrane flux recovery rate
0(wherein J is the clear water membrane flux of each step after cleaning, J
0Be the initial film flux) recovery that comes the characterization of membrane transparent performance, and then the stable against biological contamination of evaluated for film (as Fig. 7)
By experiment as can be known, the stable against biological contamination of Ag-carried nanometer titanium dioxide Modified Membrane obviously is better than unmodified membrane.Analysis on Mechanism is thought, polychloroethylene film after the modification of employing Ag-carried nanometer titanium dioxide not only has good bacteriostasis property, and its surface is not easy the adsorbed film polluter, even the film surface forms pollution layer to a certain extent like this, pollution layer also has permeability preferably, hydrone still can pass through under the less situation of resistance, thereby its water flux is also than stable before unmodified.
(5) can improve the water flux of film to a certain extent
Membrane flux is meant under certain operating pressure, sees through the volume of water of the film of unit are in the unit interval.It is the diactinic important indicator of separation of characterization of membrane.The high-molecular organic material that this experiment is adopted is polyvinyl chloride (PVC), because the hydrophily of PVC is not high, the flux of its synthetic film is generally less, has limited its application.Being added in outside the biocidal property that has strengthened film of Ag-carried nanometer titanium dioxide can also improve the hydrophily of PVC film effectively, thereby flux is increased.The clear water flux that adopts the film before and after the Ag-carried nanometer titanium dioxide modification along with the situation of change of pressure as shown in Figure 8.
As can be seen from Figure 8, the ultrafiltration membrance filter flux after the employing Ag-carried nanometer titanium dioxide is composite modified has obviously improved, and filters the power consumption that needs and also reduces.This be since Ag-carried nanometer titanium dioxide as metal nanoparticle, its adding and being dispersed in effectively in the preparation liquid has improved the hydrophily in film surface, film chamber, so the hydrone easier film that sees through.
Advantage of the present invention is:
1, film-forming process is simple, ripe, is easy to realize;
2, the adding of Ag-carried nanometer titanium dioxide powder makes the polyvinyl chloride membrane material have bacteriostasis property, bacterium can't breed in film surface or film chamber, Ag-carried nanometer titanium dioxide shows bactericidal action respectively in film surface and film chamber, further reduced the total number of bacteria of membrane filtration water outlet;
3, Ag-carried nanometer titanium dioxide extensively is distributed in film surface, membrane micropore and the film chamber (as Fig. 9), has increased and the touch opportunity that is filtered microorganism in the solution, and the efficient of sterilization is improved;
4, carrying the Ag-carried nanometer titanium dioxide low-pressure membrane can under low pressure move, and energy consumption is low;
5, the adding of Ag-carried nanometer titanium dioxide powder has improved the surface energy of polyvinyl chloride well, improves the hydrophily of film, and the water flux of film is improved;
6, the Ag-carried nanometer titanium dioxide powder be added in the formation that also suppresses the macropore of film on certain degree, increased the space relationship of film, improved film strength, prolonged the life-span of film.
7, the adding of Ag-carried nanometer titanium dioxide powder does not produce obviously influence to the microstructure of film, has kept the original excellent characteristic of polyvinyl chloride diffusion barrier (as Figure 10);
8, the nanometer powder addition is few, and the preparation cost increase seldom.
Description of drawings
Fig. 1. Ag-carried nanometer titanium dioxide/PVC casting solution (left side); Pure PVC casting solution (right side).
Fig. 2. under the illumination condition, 37 ℃ of inhibition zones (b among the figure) that after 24h cultivates, form; A is the common PVC film among the figure, does not form inhibition zone.
Fig. 3. lucifuge is shone under the condition, 37 ℃ of inhibition zones (b among the figure) that form after 24h cultivates; A is the common PVC film among the figure, does not form inhibition zone.
Fig. 4. Ag-carried nanometer titanium dioxide milipore filter and blank sample surface Escherichia coli quantity (1h cultivates afterwards) further specifies the bacteriostasis property of Modified Membrane
After filtering surface water before the modification of Fig. 5 a. film, at film surface contamination situation sem photograph; This film of Fig. 5 b. cleans the back sem photograph.
After filtering surface water after the modification of Fig. 6 a. film, at film surface contamination situation sem photograph; Sem photograph after this film of Fig. 6 b cleans under illumination condition.
Fig. 7. two kinds of films are cleaned membrane flux recovery rate later under the same conditions contrast.
Fig. 8. different constituents are to the influence (seeing through pressure 0.1MPa, temperature 25oC) of membrane flux, wherein: the pure PVC film of flux 1--, flux 2--Ag-carried nanometer titanium dioxide modified PVC film.
Fig. 9. be the energy spectrogram of Ag-carried nanometer titanium dioxide film, success is compound with film to show the Ag-carried nanometer titanium dioxide particle
The surface scan Electronic Speculum of two kinds of films of Figure 10 a-Figure 10 b., show that the structure aperture that adds the Ag-carried nanometer titanium dioxide caudacoria does not take place obviously to change, after wherein Figure 10 b is before the modification, Figure 10 a is modification, show that the adding of Ag-carried nanometer titanium dioxide does not change the microcosmic knot of film.
The specific embodiment
For example the present invention is done in more detail below and describes:
Polyvinyl chloride is dissolved in the N-N dimethylacetamide solvent, treat that it dissolves the back fully and add Ag-carried nanometer titanium dioxide uniformly in the process that stirs, add sodium hexametaphosphate dispersant then immediately, add pore former polyvinylpyrrolidone (PVP) again, evenly stirred 24 hours, the Ag-carried nanometer titanium dioxide uniform particles is scattered in the solution, seal static placement deaeration in 2 days, then 25 ℃ of temperature, under 65% humidity, prolong the stream film forming with the L-S phase inversion, after the 50 second time of volatilizing, put into 20% alcohol solidification liquid at leisure and soaked 24 hours, then clean with the distilled water rinsing, it is standby to make Ag-carried nanometer titanium dioxide modified polyvinyl chloride diffusion barrier.
Embodiment 1:
The polyvinyl chloride (PVC) of 3.5 grams is dissolved in the 35 gram N-N dimethylacetamide solvents, treat that it dissolves the back fully and add 0.5 gram Ag-carried nanometer titanium dioxide powder uniformly in the process that stirs, the sodium hexametaphosphate dispersant that adds 0.5 gram immediately, the pore former polyvinylpyrrolidone (PVP) that adds 1.5 grams at last, evenly stirred 24 hours, the Ag-carried nanometer titanium dioxide uniform particles is scattered in the solution, after sealing static placement deaeration in 2 days, 25 ℃ of temperature, humidity 65% time with the L-S phase inversion at casting film-forming on glass; Volatilize after 50 seconds, put into 20% alcohol solidification liquid, treat that film peels off automatically after, glass plate is taken out from solidification liquid, film is stayed in the solidification liquid and soaked 24 hours, and is with distilled water that the film rinsing is clean, makes Ag-carried nanometer titanium dioxide modified polyvinyl chloride flat-plate separation film.
The characteristics of this flat sheet membrane are: various component prescriptions all are to add by optimal proportion, and the various aspects of performance of made film is all better.
Embodiment 2:
The polyvinyl chloride (PVC) of 3.5 grams is dissolved in the 35 gram N-N dimethylacetamide solvents, treat that it dissolves the back fully and add 0.5 gram Ag-carried nanometer titanium dioxide powder uniformly in the process that stirs, the sodium hexametaphosphate dispersant that adds 0.486 gram immediately, the pore former polyvinylpyrrolidone (PVP) that adds 0.5 gram at last, evenly stirred 24 hours, the Ag-carried nanometer titanium dioxide uniform particles is scattered in the solution, after sealing static placement deaeration in 2 days, 25 ℃ of temperature, humidity 65% time with the L-S phase inversion at casting film-forming on glass; Volatilize after 50 seconds, put into 20% alcohol solidification liquid, treat that film peels off automatically after, glass plate is taken out from solidification liquid, film soaked in solidification liquid 24 hours, and is with distilled water that the film rinsing is clean, makes Ag-carried nanometer titanium dioxide modified polyvinyl chloride flat-plate separation film.
The characteristics of this flat sheet membrane are: membrane aperture is smaller, is applicable to hold back to remove the littler material of molecular weight.
Embodiment 3:
The polyvinyl chloride (PVC) of 5.0 grams is dissolved in the 35 gram N-N dimethylacetamide solvents, treat that it dissolves the back fully and add 0.5 gram Ag-carried nanometer titanium dioxide powder uniformly in the process that stirs, the sodium hexametaphosphate dispersant that adds 0.5 gram immediately, the pore former polyvinylpyrrolidone (PVP) that adds 1.5 grams at last, evenly stirred 24 hours, the Ag-carried nanometer titanium dioxide uniform particles is scattered in the solution, after sealing static placement deaeration in 2 days, 25 ℃ of temperature, humidity 65% time with the L-S phase inversion at casting film-forming on glass; Volatilize after 50 seconds, put into 20% alcohol solidification liquid, treat that film peels off automatically after, glass plate is taken out from solidification liquid, film soaked in solidification liquid 24 hours, and is with distilled water that the film rinsing is clean, makes Ag-carried nanometer titanium dioxide modified polyvinyl chloride flat-plate separation film.
The characteristics of this flat sheet membrane are: the mechanical strength of film is higher, is suitable for long reactor of operation cycle.
Embodiment 4:
The polyvinyl chloride (PVC) of 3.5 grams is dissolved in the 35 gram N-N dimethylacetamide solvents, treat that it dissolves the back fully and add 0.5 gram Ag-carried nanometer titanium dioxide powder uniformly in the process that stirs, the sodium hexametaphosphate dispersant that adds 0.5 gram immediately, the pore former polyvinylpyrrolidone (PVP) that adds 1.5 grams at last, evenly stirred 24 hours, the Ag-carried nanometer titanium dioxide uniform particles is scattered in the solution, after sealing static placement deaeration in 2 days, 25 ℃ of temperature, humidity 65% time with L-S phase inversion casting film-forming in the epoxy antipriming pipe; Volatilize after 50 seconds, put into 20% alcohol solidification liquid, film soaked in solidification liquid 24 hours, and is with distilled water that the film rinsing is clean, loads onto sleeve pipe, makes Ag-carried nanometer titanium dioxide modified polyvinyl chloride tubular type diffusion barrier.
The characteristics of this tubular membrane are: various component prescriptions all are to add by optimal proportion, and the various aspects of performance of made film is all better.
Embodiment 5:
The polyvinyl chloride (PVC) of 3.5 grams is dissolved in the 35 gram N-N dimethylacetamide solvents, treat that it dissolves the back fully and add 0.5 gram Ag-carried nanometer titanium dioxide powder uniformly in the process that stirs, the sodium hexametaphosphate dispersant that adds 0.486 gram immediately, the pore former polyvinylpyrrolidone (PVP) that adds 0.5 gram at last, evenly stirred 24 hours, the Ag-carried nanometer titanium dioxide uniform particles is scattered in the solution, after sealing static placement deaeration in 2 days, 25 ℃ of temperature, humidity 65% time with L-S phase inversion casting film-forming in the epoxy antipriming pipe; Volatilize after 50 seconds, put into 20% alcohol solidification liquid, film soaked in solidification liquid 24 hours, and is with distilled water that the film rinsing is clean, loads onto sleeve pipe, makes Ag-carried nanometer titanium dioxide modified polyvinyl chloride tubular type diffusion barrier.
The characteristics of this tubular membrane are: membrane aperture is smaller, is applicable to hold back to remove the littler material of molecular weight.
Embodiment 6:
The polyvinyl chloride (PVC) of 5.0 grams is dissolved in the 35 gram N-N dimethylacetamide solvents, treat that it dissolves the back fully and add 0.5 gram Ag-carried nanometer titanium dioxide powder uniformly in the process that stirs, the sodium hexametaphosphate dispersant that adds 0.5 gram immediately, the pore former polyvinylpyrrolidone (PVP) that adds 1.5 grams at last, evenly stirred 24 hours, the Ag-carried nanometer titanium dioxide uniform particles is scattered in the solution, after sealing static placement deaeration in 2 days, 25 ℃ of temperature, humidity 65% time with L-S phase inversion casting film-forming in the epoxy antipriming pipe; Volatilize after 50 seconds, put into 20% alcohol solidification liquid, film soaked in solidification liquid 24 hours, and is with distilled water that the film rinsing is clean, loads onto sleeve pipe, makes Ag-carried nanometer titanium dioxide modified polyvinyl chloride tubular type diffusion barrier.
The characteristics of this tubular membrane are: the mechanical strength of film is higher, is suitable for long reactor of operation cycle.
Claims (6)
1. an Ag-carried nanometer titanium dioxide/polychloroethylene film is characterized in that component and content are, all percentages are mass percent:
Polyvinyl chloride 7%-13%
Dissolving solventless polyvinyl chloride 60%-90%
Ag-carried nanometer titanium dioxide 0.1%-2%
Calgon or neopelex 0.2%-4%
Pore former 2%-8%.
2. Ag-carried nanometer titanium dioxide/polychloroethylene film according to claim 1 is characterized in that: described dissolving solventless polyvinyl chloride is N-N dimethylacetylamide, dimethylacetylamide, dimethyl formamide or acetone.
3. Ag-carried nanometer titanium dioxide/polychloroethylene film according to claim 1 and 2 is characterized in that: described pore former is polyvinylpyrrolidone, polyethylene glycol or perchlorate.
4. the preparation method of an Ag-carried nanometer titanium dioxide/polychloroethylene film is characterized in that:
A, get polyvinyl chloride and be dissolved in the N-N dimethylacetamide solvent;
B, treat that polyvinyl chloride dissolves the back fully and in the process that stirs, add Ag-carried nanometer titanium dioxide uniformly, add sodium hexametaphosphate dispersant then immediately;
C, add the pore former polyvinylpyrrolidone again, evenly be stirred to the Ag-carried nanometer titanium dioxide uniform particles and be scattered in the solution;
D, above-mentioned solution are 20-30 ℃ of static placement deaeration in 1-2 days down;
E, the casting solution after the deaeration is watered film under 15-30 ℃, 40%-80% humidity;
F, water film after casting solution in air, volatilize 10-100 after second, put into 10%-50% alcohol solidification liquid at leisure and soaked 12-24 hour;
G, to take out film from solidification liquid clean with the distilled water rinsing, makes Ag-carried nanometer titanium dioxide modified polyvinyl chloride diffusion barrier;
Wherein the mass percent of component consists of: solvent 60%-90%, Ag-carried nanometer titanium dioxide 0.1%-2%, calgon or neopelex 0.2%-4%, the pore former 2%-8% of polyvinyl chloride 7%-13%, dissolving polyvinyl chloride.
5. the preparation method of Ag-carried nanometer titanium dioxide/polychloroethylene film according to claim 4, it is characterized in that: described dissolving solventless polyvinyl chloride is N-N dimethylacetylamide, dimethylacetylamide, dimethyl formamide or acetone.
6. according to claim 4 or 5 described Ag-carried nanometer titanium dioxide/polychloroethylene films, it is characterized in that: described pore former is polyvinylpyrrolidone, polyethylene glycol or perchlorate.
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| CN108511765A (en) * | 2018-04-19 | 2018-09-07 | 哈尔滨工业大学 | A kind of graphene doping filtering membrane electrode and preparation method thereof suitable for microbiological fuel cell |
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| CN110205839A (en) * | 2019-06-17 | 2019-09-06 | 浙江海印数码科技有限公司 | A kind of Blue inkjet ink and preparation method thereof of carboxylated polymers micro-ball load disperse dyes and mica powder intercalation synthesis |
| CN110205839B (en) * | 2019-06-17 | 2021-08-27 | 浙江海印数码科技有限公司 | Blue inkjet ink compounded by intercalation of carboxylated polymer microsphere loaded disperse dye and mica powder and preparation method thereof |
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