CN110038455A - A method of improving PVDF membrane material resistance to soiling - Google Patents
A method of improving PVDF membrane material resistance to soiling Download PDFInfo
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- CN110038455A CN110038455A CN201910381998.7A CN201910381998A CN110038455A CN 110038455 A CN110038455 A CN 110038455A CN 201910381998 A CN201910381998 A CN 201910381998A CN 110038455 A CN110038455 A CN 110038455A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0079—Manufacture of membranes comprising organic and inorganic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/34—Polyvinylidene fluoride
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2325/00—Details relating to properties of membranes
- B01D2325/36—Hydrophilic membranes
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Abstract
The present invention relates to new function material technical fields, disclose a kind of method for improving PVDF membrane material resistance to soiling, modified graphene is applied to polyvinylidene fluoride film blending and modifying, the modified graphene being prepared has multiple active sites, Kynoar can be modified, change the hydrophobic property of Kynoar, membrane material is set to have very strongly hydrophilic and electrostatic repulsion, the hydrophilic angle of film surface becomes smaller, it is easy to be spontaneously wet out by water, reduce concentration polarization, permeability and resistance to soiling significantly improve, even it is directed to organic pollutant, also good centrifugation can be played, greatly reduce the cleaning and replacement frequency of membrane material, reduce pollution and energy consumption cost.
Description
Technical field
The invention belongs to new function material technical fields, and in particular to a kind of raising PVDF membrane material resistance to soiling
Method.
Background technique
It is Piezoelectricity under Kynoar (PVDF) normality, crystallinity is about 50%.Hitherto reported has α, β, γ, δ
And 5 kinds of crystal forms such as ε, they are formed under different conditions, under certain condition (effect of heat, electric field, machinery and radiation energy)
It can mutually convert again.PVDF resin be primarily referred to as vinylidene fluoride homopolymer or vinylidene contain on a small quantity with other it is fluoride-based
The copolymer of monomer, PVDF resin have both the characteristic of fluororesin and resins for universal use, except with good chemical corrosion resistance, resistance to height
Warm nature, weatherability, outside resistance to ray radiation performance, also has the properties such as piezoelectricity, dielectricity, pyroelectricity, is oxidative resistance
The big product that yield is at the second place in fluoro-containing plastic at present, global annual capacity are more than 4.3 ten thousand tons.
Kynoar becomes the now widely used raw material for preparing membrane material because of its excellent ageing-resistant, high intensity
One of.In the industrial production, it is applied to the fields such as UF membrane, concentration, purifying, and since its pollution resistance is poor, fouling membrane is serious,
Blocking is easily generated, in the application by technical restriction, and causes greatly to waste, increases production cost.Currently, using
The method of modifying of inorganic nano material cannot still play the role of permanent resistant, and the increase of film thickness is caused, so that film
Material property reduces, and cost dramatically increases.
Summary of the invention
The purpose of the present invention is being directed to existing problem, a kind of side for improving PVDF membrane material resistance to soiling is provided
Method changes the hydrophobic property of Kynoar, and membrane material is made to have very strongly hydrophilic and electrostatic repulsion, and the hydrophilic angle of film surface becomes
It is small, it is easy to be spontaneously wet out by water, reduces concentration polarization, permeability and resistance to soiling significantly improve.
The present invention is achieved by the following technical solutions:
A method of improving PVDF membrane material resistance to soiling, comprising the following steps:
(1) 10.0-10.2 grams of graphite powder, 4.5-4.8 grams of sodium hypophosphite, 16.7-16.9 grams of potassium permanganate are weighed, under stiring according to
It is secondary to be added in the beaker equipped with the 110-120 milliliters of concentrated sulfuric acids, 65-70 is warming up under water-bath heating after being uniformly mixed
DEG C, insulated and stirred 20-25 minutes, 150-160 ml deionized water is then added, continues to be stirred to react 15-18 minutes, stands 2-
After 3 hours, the aqueous hydrogen peroxide solution that 30-35 milliliters of mass concentrations are 26-28% is added into beaker again, and under stiring
10-12 milliliters of nickel acetate aqueous solutions are added dropwise, after dripping, are persistently stirred to react at 35-40 DEG C 30-40 minutes, it then will be anti-
It answers mixture to be filtered isolated thick product, product is used into dilute hydrochloric acid and deionized water successively centrifuge washing 3-5
Secondary, the product after collecting centrifugal treating is scattered in distilled water, is carried out ultrasonic disperse and is handled 18-20 hours, forming concentration is
The stable state suspension of 0.14-0.15 mg/ml is spare；
(2) 2.5-2.6 grams of chromium chloride and 3.3-3.4 grams of zinc nitrate hexahydrate are weighed, is dissolved into 45-50 milliliters of dehydrated alcohols,
It is stirred at 25-30 DEG C 20-25 minutes, the stable state suspension that step (1) is prepared then is added into mixed liquor, stirring is equal
After even, 1.5-1.6 grams of polyethylene glycol and 0.24-0.25 grams of sodium hypochlorite is added, stirs 40-50 minutes continuously and healthily, is mixed
It closes object to be transferred in the reaction kettle of polytetrafluoroethyllining lining, sets reaction temperature as 175-180 DEG C, the reaction time is that 20-22 is small
When, cooled to room temperature, carries out centrifugation using deionized water and dehydrated alcohol after gained reactant filtering and washes after reaction
It washs 3-5 times, obtains product and be placed in 70-75 DEG C of baking oven dry 8-10 hours to obtain modified graphene；
(3) modified graphene that step (2) is prepared is placed in mortar and is ground into powdery, be placed in a beaker, 85.5- is added
86.0 grams dimethyl acetamide ultrasonic disperse 30-35 minutes, 20.6-21.0 grams of Kynoar and 7.2-7.3 grams is then added
0.40-0.42 milliliters of silane coupling agent G-570, strong stirring 4.5- are added dropwise under 64-68 DEG C of heating in polyvinylpyrrolidone
It 5.0 hours, using aqueous acetic acid regulation system pH value between 6.6-6.8, stands and is cooled to after continuing stirring 60-70 minutes
It 25-30 DEG C, is subsequently placed in deaeration in vacuum oven and handles 8-10 hours, precipitating film forming can be carried out, cured film is placed in
Impregnated 20-24 hours in deionized water, be subsequently placed in 55-60 DEG C of baking oven and dry, can be prepared resistance to soiling it is strong it is poly- partially
Fluoride film material.
It is further described as to above scheme, step (1) the dilute hydrochloric acid pH value is between 4.4-4.5.
It is further described as to above scheme, step (1) the nickel acetate aqueous solution mass concentration is 13.5-
14.0%。
It is further described as to above scheme, step (2) aqueous acetic acid pH value is between 4.8-4.9.
It is further described as to above scheme, step (2) the modified graphene diameter is at 80-100 nanometers
Between.
It is further described as to above scheme, step (3) the PVDF membrane material aperture being prepared
Size is between 0.5-0.6 microns.
The present invention has the advantage that limited in order to solve existing PVDF membrane material pollution resistance compared with prior art
Problem, the present invention provides a kind of methods for improving PVDF membrane material resistance to soiling, modified graphene are applied to poly- inclined
Fluoride film blending and modifying, the modified graphene being prepared have multiple active sites, can repair to Kynoar
Decorations, change the hydrophobic property of Kynoar, and membrane material is made to have very strongly hydrophilic and electrostatic repulsion, and the hydrophilic angle of film surface becomes
It is small, it is easy to be spontaneously wet out by water, reduces concentration polarization, permeability and resistance to soiling significantly improve, and are even directed to organic pollutant, also can
Good centrifugation is played, the cleaning and replacement frequency of membrane material is greatly reduced, reduces pollution and energy consumption cost, this
The method for inventing the raising PVDF membrane material resistance to soiling used solves existing PVDF membrane material pollution resistance
Limited problem, reduces lock out operation and maintenance cost, extends the service life of film, provides newly for the exploitation of membrane material
Thinking and direction, improve the development and utilization of PVDF membrane material, can be realized promote membrane material isolation technics industry
Development, improve the realistic meaning in the application value in the fields such as electronics, biology, medicine, be a kind of to be extremely worth of widely use
Technical solution.
Specific embodiment
To make the purpose of the present invention, technical solution and effect clearer, clear and definite, combined with specific embodiments below to this hair
It is bright to be described further, it should be understood that the specific embodiments described herein are merely illustrative of the present invention, is not used to limit
Technical solution provided by the present invention.
Embodiment 1
A method of improving PVDF membrane material resistance to soiling, comprising the following steps:
(1) 10.0 grams of graphite powders, 4.5 grams of sodium hypophosphites, 16.7 grams of potassium permanganate are weighed, are added sequentially to be equipped under stiring
In the beaker of 110 milliliters of concentrated sulfuric acids, 65 DEG C are warming up under water-bath heating after being uniformly mixed, insulated and stirred 20 minutes,
Then 150 ml deionized waters are added, continue to be stirred to react 15 minutes, after standing 2 hours, are added 30 milliliters into beaker again
The aqueous hydrogen peroxide solution that mass concentration is 26%, and 10 milliliters of nickel acetate aqueous solutions are added dropwise under stiring, after dripping, 35
It is persistently stirred to react at DEG C 30 minutes, reaction mixture is then filtered isolated thick product, product is used
Dilute hydrochloric acid and deionized water successively centrifuge washing 3 times, the product after collecting centrifugal treating are scattered in distilled water, carry out ultrasound point
Processing 18 hours is dissipated, it is spare to form the stable state suspension that concentration is 0.14 mg/ml；
(2) 2.5 grams of chromium chlorides and 3.3 grams of zinc nitrate hexahydrates are weighed, is dissolved into 45 milliliters of dehydrated alcohols, stirs 20 at 25 DEG C
Minute, the stable state suspension that step (1) is prepared then is added into mixed liquor, 1.5 grams of poly- second are added after mixing evenly
Two pure and mild 0.24 gram of sodium hypochlorite stir 40 minutes continuously and healthily, obtain the reaction that mixture is transferred to polytetrafluoroethyllining lining
In kettle, reaction temperature is set as 175 DEG C, the reaction time is 20 hours, after reaction cooled to room temperature, gained reactant
Carried out centrifuge washing 3 times after filtering using deionized water and dehydrated alcohol, obtain product be placed in 70 DEG C of baking ovens it is 8 hours dry
To modified graphene；
(3) modified graphene that step (2) is prepared is placed in mortar and is ground into powdery, be placed in a beaker, be added 85.5
Grams dimethyl acetamide ultrasonic disperse 30 minutes, 20.6 grams of Kynoar and 7.2 grams of polyvinylpyrrolidones are then added,
Under 64 DEG C of heating, 0.40 milliliter of silane coupling agent G-570 is added dropwise, strong stirring 4.5 hours, uses aqueous acetic acid regulation system
PH value is between 6.6-6.8, and continuing stirring, standing is cooled to 25 DEG C after sixty minutes, is subsequently placed in deaeration in vacuum oven and handles
8 hours, precipitating film forming can be carried out, cured film is placed in deionized water and is impregnated 20 hours, is subsequently placed in 55 DEG C of baking ovens
Drying, can be prepared the strong PVDF membrane material of resistance to soiling.
It is further described as to above scheme, step (1) the dilute hydrochloric acid pH value is between 4.4-4.5.
It is further described as to above scheme, step (1) the nickel acetate aqueous solution mass concentration is 13.5%.
It is further described as to above scheme, step (2) aqueous acetic acid pH value is between 4.8-4.9.
It is further described as to above scheme, step (2) the modified graphene diameter is at 80-100 nanometers
Between.
It is further described as to above scheme, step (3) the PVDF membrane material aperture being prepared
Size is between 0.5-0.6 microns.
Embodiment 2
A method of improving PVDF membrane material resistance to soiling, comprising the following steps:
(1) 10.1 grams of graphite powders, 4.6 grams of sodium hypophosphites, 16.8 grams of potassium permanganate are weighed, are added sequentially to be equipped under stiring
In the beaker of 115 milliliters of concentrated sulfuric acids, 68 DEG C are warming up under water-bath heating after being uniformly mixed, insulated and stirred 22 minutes,
Then 155 ml deionized waters are added, continue to be stirred to react 16 minutes, after standing 2.5 hours, 33 millis are added into beaker again
The aqueous hydrogen peroxide solution that mass per liter concentration is 27%, and 11 milliliters of nickel acetate aqueous solutions are added dropwise under stiring, after dripping,
It is persistently stirred to react at 38 DEG C 35 minutes, reaction mixture is then filtered isolated thick product, product is made
With successively centrifuge washing 4 times of dilute hydrochloric acid and deionized water, the product after collecting centrifugal treating is scattered in distilled water, carries out ultrasound
Decentralized processing 19 hours, it is spare to form the stable state suspension that concentration is 0.145 mg/ml；
(2) 2.55 grams of chromium chlorides and 3.35 grams of zinc nitrate hexahydrates are weighed, is dissolved into 48 milliliters of dehydrated alcohols, is stirred at 28 DEG C
23 minutes, the stable state suspension that step (1) is prepared then is added into mixed liquor and is added 1.55 grams after mixing evenly
Polyethylene glycol and 0.245 gram of sodium hypochlorite stir 45 minutes continuously and healthily, obtain mixture and be transferred to polytetrafluoroethyllining lining
In reaction kettle, reaction temperature is set as 178 DEG C, the reaction time is 21 hours, and cooled to room temperature, gained are anti-after reaction
It is carried out centrifuge washing 4 times after answering object to filter using deionized water and dehydrated alcohol, obtaining product, to be placed in 72 DEG C of baking ovens dry 9 small
When obtain modified graphene；
(3) modified graphene that step (2) is prepared is placed in mortar and is ground into powdery, be placed in a beaker, be added 85.55
Grams dimethyl acetamide ultrasonic disperse 33 minutes, 20.8 grams of Kynoar and 7.25 grams of polyvinylpyrrolidones are then added,
Under 66 DEG C of heating, 0.41 milliliter of silane coupling agent G-570 is added dropwise, strong stirring 4.8 hours, adjusts body using aqueous acetic acid
It is pH value between 6.6-6.8, is stood after continuing stirring 65 minutes and be cooled to 28 DEG C, be subsequently placed in vacuum oven at deaeration
Reason 9 hours, can carry out precipitating film forming, cured film is placed in deionized water and is impregnated 22 hours, 58 DEG C of baking ovens are subsequently placed in
The strong PVDF membrane material of resistance to soiling can be prepared in middle drying.
It is further described as to above scheme, step (1) the dilute hydrochloric acid pH value is between 4.4-4.5.
It is further described as to above scheme, step (1) the nickel acetate aqueous solution mass concentration is 13.8%.
It is further described as to above scheme, step (2) aqueous acetic acid pH value is between 4.8-4.9.
It is further described as to above scheme, step (2) the modified graphene diameter is at 80-100 nanometers
Between.
It is further described as to above scheme, step (3) the PVDF membrane material aperture being prepared
Size is between 0.5-0.6 microns.
Embodiment 3
A method of improving PVDF membrane material resistance to soiling, comprising the following steps:
(1) 10.2 grams of graphite powders, 4.8 grams of sodium hypophosphites, 16.9 grams of potassium permanganate are weighed, are added sequentially to be equipped under stiring
In the beaker of 120 milliliters of concentrated sulfuric acids, 70 DEG C are warming up under water-bath heating after being uniformly mixed, insulated and stirred 25 minutes,
Then 160 ml deionized waters are added, continue to be stirred to react 18 minutes, after standing 3 hours, are added 35 milliliters into beaker again
The aqueous hydrogen peroxide solution that mass concentration is 28%, and 12 milliliters of nickel acetate aqueous solutions are added dropwise under stiring, after dripping, 40
It is persistently stirred to react at DEG C 40 minutes, reaction mixture is then filtered isolated thick product, product is used
Dilute hydrochloric acid and deionized water successively centrifuge washing 5 times, the product after collecting centrifugal treating are scattered in distilled water, carry out ultrasound point
Processing 20 hours is dissipated, it is spare to form the stable state suspension that concentration is 0.15 mg/ml；
(2) 2.6 grams of chromium chlorides and 3.4 grams of zinc nitrate hexahydrates are weighed, is dissolved into 50 milliliters of dehydrated alcohols, stirs 25 at 30 DEG C
Minute, the stable state suspension that step (1) is prepared then is added into mixed liquor, 1.6 grams of poly- second are added after mixing evenly
Two pure and mild 0.25 gram of sodium hypochlorite stir 50 minutes continuously and healthily, obtain the reaction that mixture is transferred to polytetrafluoroethyllining lining
In kettle, reaction temperature is set as 180 DEG C, the reaction time is 22 hours, after reaction cooled to room temperature, gained reactant
It is carried out centrifuge washing 5 times after filtering using deionized water and dehydrated alcohol, obtains product and be placed in drying 10 hours in 75 DEG C of baking ovens
Obtain modified graphene；
(3) modified graphene that step (2) is prepared is placed in mortar and is ground into powdery, be placed in a beaker, be added 86.0
Grams dimethyl acetamide ultrasonic disperse 35 minutes, 21.0 grams of Kynoar and 7.3 grams of polyvinylpyrrolidones are then added,
Under 68 DEG C of heating, 0.42 milliliter of silane coupling agent G-570 is added dropwise, strong stirring 5.0 hours, uses aqueous acetic acid regulation system
PH value stands after continuing stirring 70 minutes between 6.6-6.8 and is cooled to 30 DEG C, is subsequently placed in deaeration in vacuum oven and handles
10 hours, precipitating film forming can be carried out, cured film is placed in deionized water and is impregnated 24 hours, is subsequently placed in 60 DEG C of baking ovens
Drying, can be prepared the strong PVDF membrane material of resistance to soiling.
It is further described as to above scheme, step (1) the dilute hydrochloric acid pH value is between 4.4-4.5.
It is further described as to above scheme, step (1) the nickel acetate aqueous solution mass concentration is 14.0%.
It is further described as to above scheme, step (2) aqueous acetic acid pH value is between 4.8-4.9.
It is further described as to above scheme, step (2) the modified graphene diameter is at 80-100 nanometers
Between.
It is further described as to above scheme, step (3) the PVDF membrane material aperture being prepared
Size is between 0.5-0.6 microns.
Comparative example 1
Difference with embodiment 1 is only that the addition for omitting sodium hypophosphite in step (1) uses, remaining is consistent.
Comparative example 2
Difference with embodiment 2 is only that the addition for omitting nickel acetate aqueous solution in step (1) uses, remaining is consistent.
Comparative example 3
Difference with embodiment 3 is only that, omits the addition of zinc nitrate hexahydrate in step (2), remaining is consistent.
Comparative example 4
Difference with embodiment 3 is only that, reaction temperature is set in step (2) as 210 DEG C, and the reaction time is 16 hours, remaining
It is consistent.
Comparative example 5
Difference with embodiment 3 is only that it is 6.4 that aqueous acetic acid regulation system pH value is used in step (3), remaining keeps one
It causes.
Comparative experiments
PVDF membrane material resistance to soiling is improved using the method for embodiment 1-3 and comparative example 1-5 respectively, to use nanometer two
Titanium oxide is applied to the method for polyvinylidene fluoride film blending and modifying as a control group, and diameter ruler is prepared in each group method respectively
It is very little be 6.5 centimetres circular specimen it is spare, film properties test is carried out to each group sample under the same test conditions, data reach
To representative data when stablizing, are acquired, obtained experimental data is the average value of 5 groups of samples, keeps unrelated change in test
Amount is consistent, counts effective average value, as a result as shown in the table:
(the measuring method of the contact angle are as follows: at 25 DEG C, pure water is dripped in film specimen surface, is surveyed using contact angle measurement
Measure the contact angle of dropping liquid film surface；The membrane flux refers to that under 0.15MPa operating pressure, film sample is 0.1 grams per liter to concentration
Bovine serum albumen solution flux；Membrane flux relative attenuation rate refers to the data measured in 10 periods；Methylene
The measuring method of blue removal rate are as follows: at 25 DEG C, pH 5.5, film sample separates the methylene blue solution that concentration is 0.45 grams per liter
Removal rate.)
The method for the raising PVDF membrane material resistance to soiling that the present invention uses solves existing PVDF membrane material
The limited problem of pollution resistance, reduces lock out operation and maintenance cost, extends the service life of film, mentions for the exploitation of membrane material
New thinking and direction have been supplied, the development and utilization of PVDF membrane material are improved, can be realized and promote membrane material separation skill
The development of art industry improves the realistic meaning in the application value in the fields such as electronics, biology, medicine, is a kind of to be extremely worth pushing away
The technical solution extensively used.
Claims (6)
1. a kind of method for improving PVDF membrane material resistance to soiling, which comprises the following steps:
(1) 10.0-10.2 grams of graphite powder, 4.5-4.8 grams of sodium hypophosphite, 16.7-16.9 grams of potassium permanganate are weighed, under stiring according to
It is secondary to be added in the beaker equipped with the 110-120 milliliters of concentrated sulfuric acids, 65-70 is warming up under water-bath heating after being uniformly mixed
DEG C, insulated and stirred 20-25 minutes, 150-160 ml deionized water is then added, continues to be stirred to react 15-18 minutes, stands 2-
After 3 hours, the aqueous hydrogen peroxide solution that 30-35 milliliters of mass concentrations are 26-28% is added into beaker again, and under stiring
10-12 milliliters of nickel acetate aqueous solutions are added dropwise, after dripping, are persistently stirred to react at 35-40 DEG C 30-40 minutes, it then will be anti-
It answers mixture to be filtered isolated thick product, product is used into dilute hydrochloric acid and deionized water successively centrifuge washing 3-5
Secondary, the product after collecting centrifugal treating is scattered in distilled water, is carried out ultrasonic disperse and is handled 18-20 hours, forming concentration is
The stable state suspension of 0.14-0.15 mg/ml is spare；
(2) 2.5-2.6 grams of chromium chloride and 3.3-3.4 grams of zinc nitrate hexahydrate are weighed, is dissolved into 45-50 milliliters of dehydrated alcohols,
It is stirred at 25-30 DEG C 20-25 minutes, the stable state suspension that step (1) is prepared then is added into mixed liquor, stirring is equal
After even, 1.5-1.6 grams of polyethylene glycol and 0.24-0.25 grams of sodium hypochlorite is added, stirs 40-50 minutes continuously and healthily, is mixed
It closes object to be transferred in the reaction kettle of polytetrafluoroethyllining lining, sets reaction temperature as 175-180 DEG C, the reaction time is that 20-22 is small
When, cooled to room temperature, carries out centrifugation using deionized water and dehydrated alcohol after gained reactant filtering and washes after reaction
It washs 3-5 times, obtains product and be placed in 70-75 DEG C of baking oven dry 8-10 hours to obtain modified graphene；
(3) modified graphene that step (2) is prepared is placed in mortar and is ground into powdery, be placed in a beaker, 85.5- is added
86.0 grams dimethyl acetamide ultrasonic disperse 30-35 minutes, 20.6-21.0 grams of Kynoar and 7.2-7.3 grams is then added
0.40-0.42 milliliters of silane coupling agent G-570, strong stirring 4.5- are added dropwise under 64-68 DEG C of heating in polyvinylpyrrolidone
It 5.0 hours, using aqueous acetic acid regulation system pH value between 6.6-6.8, stands and is cooled to after continuing stirring 60-70 minutes
It 25-30 DEG C, is subsequently placed in deaeration in vacuum oven and handles 8-10 hours, precipitating film forming can be carried out, cured film is placed in
Impregnated 20-24 hours in deionized water, be subsequently placed in 55-60 DEG C of baking oven and dry, can be prepared resistance to soiling it is strong it is poly- partially
Fluoride film material.
2. a kind of method for improving PVDF membrane material resistance to soiling as described in claim 1, which is characterized in that step (1)
The dilute hydrochloric acid pH value is between 4.4-4.5.
3. a kind of method for improving PVDF membrane material resistance to soiling as described in claim 1, which is characterized in that step (1)
The nickel acetate aqueous solution mass concentration is 13.5-14.0%.
4. a kind of method for improving PVDF membrane material resistance to soiling as described in claim 1, which is characterized in that step (2)
Aqueous acetic acid pH value is between 4.8-4.9.
5. a kind of method for improving PVDF membrane material resistance to soiling as described in claim 1, which is characterized in that step (2)
The modified graphene diameter is between 80-100 nanometers.
6. a kind of method for improving PVDF membrane material resistance to soiling as described in claim 1, which is characterized in that step (3)
The PVDF membrane material pore size being prepared is between 0.5-0.6 microns.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112090169A (en) * | 2020-08-12 | 2020-12-18 | 柳州紫荆技术转移中心有限公司 | Preparation method of graphene composite filtering material for efficient integrated water purification equipment for sewage treatment |
-
2019
- 2019-05-09 CN CN201910381998.7A patent/CN110038455A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112090169A (en) * | 2020-08-12 | 2020-12-18 | 柳州紫荆技术转移中心有限公司 | Preparation method of graphene composite filtering material for efficient integrated water purification equipment for sewage treatment |
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Application publication date: 20190723 |