CN113527730A - Printable composite cross-linked semipermeable membrane material, semipermeable membrane prepared from same and application of semipermeable membrane material - Google Patents
Printable composite cross-linked semipermeable membrane material, semipermeable membrane prepared from same and application of semipermeable membrane material Download PDFInfo
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
- B01D69/125—In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/24—Mechanical properties, e.g. strength
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/36—Hydrophilic membranes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
The invention belongs to the technical field of high polymer materials, and particularly relates to a printable composite cross-linked semipermeable membrane material, and further discloses a semipermeable membrane filtering membrane prepared from the printable composite cross-linked semipermeable membrane material, and application of the semipermeable membrane filtering membrane in the field of water treatment. The printable composite cross-linking semi-permeable membrane material takes hydrophilic polymer, high molecular resin, cross-linking agent and initiator as main raw materials, and the membrane casting solution formed by the raw materials is in an uncross-linked state and has relatively small molecular weight, thereby not only facilitating the storage of the membrane casting solution, but also being easy to obtain a more uniform wet membrane in the subsequent membrane forming and coating process. And the wet film can finish the crosslinking process at high temperature, which is helpful for improving the uniformity of the semipermeable membrane, and has more uniform characteristic and easier control of crosslinking degree compared with the traditional semipermeable membrane prepared by preparing a crosslinked substance and coating.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a printable composite cross-linked semi-permeable membrane material, and further discloses a semi-permeable membrane filtering membrane prepared from the printable composite cross-linked semi-permeable membrane material, and application of the semi-permeable membrane filtering membrane in the field of water treatment.
Background
A semi-permeable membrane (semi-permeable membrane) is a membrane that allows diffusion of certain molecules or ions in and out, and is selective to the passage of different particles. When the raw water pressure on one side of the semi-permeable membrane exceeds osmotic pressure by using a high-pressure pump, water molecules in the raw water can penetrate through the semi-permeable membrane to enter the other side, so that purified water is obtained, and substances such as dissolved and non-dissolved inorganic salts, heavy metal ions, organic matters, thalli, colloids and the like in the raw water cannot pass through the semi-permeable membrane and can only be left in concentrated water to be discharged, so that the filtration of a water body is realized. At present, a semipermeable membrane is widely applied to the water treatment industry, and how to obtain a semipermeable membrane material with better strength and toughness and controllable permeability, especially a semipermeable membrane material which can be used for adaptively adjusting and filtering water bodies with different properties, has positive significance for the efficiency of the water treatment process and the industrial development.
For example, chinese patent CN104475048A discloses a method for preparing a cross-linked membrane for water treatment, which mainly uses dextran, furfural and methyl acrylate as main raw materials, and comprises adding an initiator azobisisobutyronitrile and a cross-linking agent formaldehyde solution into an ether solution for reaction, coating the obtained casting solution on a glass sheet by a casting method, drying, soaking in the ether solution for 2-4 hours, washing with ethanol and distilled water for multiple times, and drying to obtain the cross-linked membrane. The membrane adopts a method of combining and crosslinking free radicals and formaldehyde, and can improve the heavy metal adsorption capacity of the membrane. However, in the prior art, a plurality of cross-linked films are subjected to cross-linking reaction in the form of uncoated casting solution, so that the problem of uneven coating caused by too high molecular weight in the subsequent coating process is caused, and the performance of the film is seriously influenced. Therefore, the development of a composite cross-linked semipermeable membrane material with more uniform morphology has positive significance for improving the performance of the membrane.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a printable composite cross-linked semi-permeable membrane material with better strength and toughness and controllable permeability, wherein the semi-permeable membrane material is in an uncrosslinked state in a normal state of a membrane casting solution, which is beneficial to realizing uniform coating of a subsequent film, and the cross-linking treatment after coating can also realize the cross-linking degree control of the film, effectively ensure the uniformity of the film and other advantages, and can be adaptively adjusted according to different water treatment scenes to improve the treatment efficiency;
the second technical problem to be solved by the invention is to provide the printable composite cross-linked semipermeable membrane prepared by the printable composite cross-linked semipermeable membrane material and the application thereof in the field of water treatment.
In order to solve the technical problems, the invention provides a printable composite cross-linking semi-permeable membrane material, which comprises the following raw materials in parts by weight:
0.4-2.4 parts by weight of hydrophilic polymer;
13-25 parts of polymer resin;
0.25-3.3 parts by weight of a crosslinking agent;
1-6 parts of an initiator;
5-35 parts of water.
In particular, the hydrophilic polymer comprises PVA and/or HEC. The molecular weight of the hydrophilic polymer is not too high, otherwise, the film is not easy to coat, the molecular weight is not too low, otherwise, the film forming effect is poor. Preferably, the molecular weight of PVA is 75000-80000, and the molecular weight of HEC is 100000-300000.
Specifically, the polymer resin comprises PU and/or PMMA. The molecular weight of the high polymer resin material has no great influence, and generally only a thin film with good film forming property and water resistance is needed.
Specifically, the crosslinking agent comprises a polyaldehyde, a polyol or a polyacid, and the invention preferably adopts ethylene glycol. Preferably, the crosslinking agent is directly added in the form of solution, and the concentration of the crosslinking agent preparation solution is preferably controlled to be 5-11 wt%.
Specifically, the initiator comprises ammonium persulfate and/or potassium persulfate.
The invention also discloses a method for preparing the printable composite cross-linked semi-permeable membrane material, which comprises the steps of dissolving a selected amount of the hydrophilic polymer in water to obtain a polymer solution, and adding a selected amount of the cross-linking agent, the high molecular resin, the initiator and water for uniformly mixing.
Preferably, the mass concentration of the polymer solution is 5-10 wt%, more preferably 8 wt%, and during the preparation process, the total mass can be made up after the PVA is completely dissolved, so as to ensure that the percentage content of the PVA is kept consistent.
The invention also discloses application of the printable composite cross-linked semipermeable membrane material in the field of water treatment.
The invention also discloses a printable composite cross-linked semipermeable membrane, which is prepared from the printable composite cross-linked semipermeable membrane material.
The invention also discloses a method for preparing the printable composite cross-linked semipermeable membrane, which comprises the steps of coating the printable composite cross-linked semipermeable membrane material to prepare a liquid membrane, placing the liquid membrane at 75-105 ℃ for cross-linking treatment for 1-2h, cooling and drying to obtain the printable composite cross-linked semipermeable membrane.
The invention also discloses a salt-containing wastewater filtering device which comprises the printable composite cross-linked semi-permeable membrane.
The printable composite cross-linking semi-permeable membrane material takes hydrophilic polymer, high-molecular resin, cross-linking agent and initiator as raw materials, the membrane casting solution formed by the raw materials is in an uncross-linked state, the molecular weight is relatively small, the storage of the membrane casting solution is convenient, a more uniform wet membrane can be easily obtained in the subsequent membrane forming and coating process, the cross-linking process of the wet membrane can be completed only at high temperature, the uniformity of the semi-permeable membrane is improved, and compared with the traditional semi-permeable membrane prepared by cross-linking material and coated, the printable composite cross-linking semi-permeable membrane material has more uniform characteristics, and the cross-linking degree is easy to control. In the printable composite cross-linked semi-permeable membrane material, the high molecular resin material can improve the strength and toughness of the membrane, and the membrane prepared by utilizing the high molecular resin has good water resistance and controls the permeability of water molecules or ions; and the hydrophilic polymer is added into the high molecular resin, so that a hydrophilic channel can be opened in the high molecular membrane, and an ion channel is further manufactured, so that the purpose of selective permeation is achieved, and a swelling controllable film is obtained, so that the semi-permeable membrane has better filtering performance. The printable composite cross-linking semipermeable membrane material can be used for obtaining a semipermeable membrane with high strength and controllable aperture by compounding hydrophilic polymers and water-resistant compounds, and can be used for obtaining a composite membrane with certain strength by compounding the semipermeable membrane material with tough high molecular materials.
The printable composite cross-linked semipermeable membrane material adopts a method of main chain cross-linking and branched chain cross-linking composite cross-linking, the cross-linking of free radicals mainly occurs in the main chain, and the cross-linking of a cross-linking agent mainly occurs in a side group. The initiator can be used for crosslinking the main chain of the hydrophilic polymer and the high molecular resin, so that a crosslinked substance with small swelling degree can be obtained, and larger molecules can permeate; the crosslinking agent can be used for controlling the branched chains of the hydrophilic polymer to be crosslinked, more network structures can be formed on the basis of the main chain structure, and then the ion permeability of the semipermeable membrane can be regulated and controlled by preparing a network channel, and the size of the permeating molecules is selected, so that the purpose of regulating and controlling the permeation performance of the membrane is achieved. The printable composite cross-linking semipermeable membrane material can control the swelling degree by a composite cross-linking method of a hydrophilic polymer main chain and a branched chain, and different swelling degrees can lead the semipermeable membrane to have different passing pore diameters, thereby achieving the aim of treating different waste water.
According to the printable composite cross-linking semipermeable membrane material, the method of cross-linking the side chain of the hydrophilic polymer by matching cross-linking agents with different proportions can be used for regulating and controlling the aperture size and the cross-linking degree of the mesh channel in the branched chain of the semipermeable membrane, and a semipermeable membrane product with superior permeability can be selected for actual wastewater consisting of different salts; the thickness, swelling degree and hydrophobicity of the cross-linked membrane with different proportions can be designed, so that the semi-permeable membrane can be adjusted to be suitable for application in different occasions, and the membrane has good operability. The semi-permeable membrane material is cheap and easy to obtain, simple and convenient to manufacture, environment-friendly and capable of aiming at different application scenes. By regulating and controlling the performance of the semipermeable membrane, high-salinity wastewater, seawater desalination, organic wastewater, leachate, oily wastewater and the like can be separated respectively, and the aim of treating and purifying the wastewater is achieved.
The printable composite cross-linking semi-permeable membrane material adopts a membrane forming mode of firstly coating and then reacting and cross-linking, adopts a mode of coating under the condition of low molecular weight in an aqueous system and then cross-linking in the drying process to obtain a membrane with more uniform thickness and controllable performance, and has simple cross-linking degree control method and good repeatability.
Drawings
In order that the present disclosure may be more readily and clearly understood, the following detailed description of the present disclosure is provided in connection with the accompanying drawings, which,
FIG. 1 is a schematic view of a process for producing a PVA film of the present invention; wherein, a is a coating substrate, and b is an I-shaped film for coating;
FIG. 2 is a surface microstructure of a film based on 8% PVA + 7% ethylene glycol crosslinking;
FIG. 3 shows the contact angles of PVA films (film thickness 400 μm) obtained by crosslinking at different ratios of ethylene glycol, wherein 1 is 8% PVA, 2 is 8% PVA + 3% ethylene glycol, 3 is 8% PVA + 5% ethylene glycol, 4 is 8% PVA + 7% ethylene glycol, 5 is 8% PVA + 9% ethylene glycol, and 6 is 8% PVA + 11% ethylene glycol;
FIG. 4 shows the results of the retention rate measurements of the membranes.
Detailed Description
Example 1
The printable composite cross-linked semipermeable membrane material described in this example 1 comprises raw materials of PVA (8%), PU, initiator (potassium persulfate), cross-linking agent (ethylene glycol) and water, and the specific matching content in each example is shown in table 1 below.
In this example, the crosslinking process of PVA and ethylene glycol is as follows:
as shown in the process of fig. 1, the method for preparing the printable composite cross-linked semipermeable membrane described in this example includes the following steps:
(1) preparation of 8% PVA solution
Firstly, measuring 92mL of distilled water by using a 250mL beaker, pouring the distilled water into the beaker, weighing the total weight of the beaker, a stirrer and the distilled water, and then weighing 8g of PVA resin particles;
placing the beaker filled with the weighed distilled water on a magnetic stirrer, heating to 80 ℃, and rotating at 900 rpm;
thirdly, gradually adding the weighed PVA resin particles into distilled water, and stirring at a constant temperature of 85 ℃ until the PVA resin particles are completely dissolved;
fourthly, when the PVA resin is completely dissolved until the solution is viscous, colorless and transparent, weighing the total weight of the beaker, the stirrer and the PVA solution, comparing the total weight with the original weight, adding distilled water to the original weight, and repeating the steps for three times;
stopping heating, reducing the rotating speed until the PVA solution is cooled to the room temperature;
sixthly, placing the prepared 8 percent PVA solution into a wide-mouth bottle, and sealing and storing;
(2) preparation of PVA film
Weighing 20g of PVA solution;
weighing a selected amount of glycol and adding water to prepare liquid with the concentration of 7 wt%;
mixing and stirring the ethylene glycol liquid and the PVA solution by using a magnetic stirrer until the ethylene glycol liquid and the PVA solution are uniformly mixed to obtain mixed solutions of PVA and ethylene glycol with different proportions, and adding the compounded PU and potassium persulfate;
filtering the stirred solution by using a filter screen, and filtering out impurities and bubbles to obtain a semipermeable membrane material;
(3) coated and crosslinked to form a film
Firstly, as shown in fig. 1, fixing a base material on a glass plate by using an adhesive tape (for example, a), then placing the glass plate on a flat desktop, and then placing an I-shaped film coating device at the upper end of the base material (for example, b);
secondly, sucking a proper amount of solution by using a disposable dropper, and uniformly dripping the solution from left to right to the front section of the I-shaped film coating device and the base material;
thirdly, rapidly pulling the I-shaped film coating device to the lower end of the base material at a constant speed, and uniformly coating the mixed solution on the surface of the base material;
fourthly, the obtained mixed film is subjected to cross-linking treatment for 1 to 2 hours at the temperature of between 75 and 105 ℃, the mixed film is taken out and placed on a clean and flat table top to be cooled to room temperature, then the film and the base material are taken off from the glass plate and placed in a vacuum drier to be dried for 48 hours, and the film is obtained, wherein the appearance of the film is shown in the attached figure 1.
Comparative examples 1 to 5
The raw materials and preparation method of the films described in comparative examples 1-5 are the same as example 1, except that the selection and proportioning of the raw materials of the components are different, and the specific addition amount is shown in the following table 1.
The semipermeable membrane materials prepared in example 1 and comparative examples 1 to 5 were tested for swelling degree and contact angle, respectively, and the results are shown in table 1 below.
TABLE 1 amounts (grams) of each of the materials used in examples 1-6
| Wet film thickness 300 μm | Example 1 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 |
| Water (W) | 8.21 | 18.4 | 18.4 | 8.21 | 14.42 | 14.42 |
| PVA | 0.54 | 1.6 | 1.6 | 0.54 | 1.08 | 1.08 |
| PU | 18 | 0 | 0 | 18 | 18 | 18 |
| |
1 | 0 | 0 | 1 | 0 | 0 |
| Crosslinking agent | 0.34 | 0 | 1 | 0 | 0 | 0.68 |
| Degree of swelling | 2.44％ | 1055.00％ | 284.21％ | 9.86％ | 27.5％ | 12.99％ |
| Contact angle | 59.5 | 29.8° | 54.4 | 71.5 | 78.9 | 79.3 |
Examples 2 to 6
The starting materials and the process for producing semipermeable membranes described in the subsequent 2 to 6 of this example were the same as those of example 1 except that the ethylene glycol was added in amounts of 3%, 5%, 7%, 9% and 11% by weight, respectively, based on the PVA polymerization solution (8 wt%), and the desired semipermeable membrane was obtained by crosslinking, and the wet film thickness in the coating step was controlled to 400. mu.m. Wherein the surface micro-morphology of the film obtained by crosslinking based on 8% PVA + 7% ethylene glycol is shown in figure 2. Therefore, the 8% PVA + 7% glycol film is formed by adding glycol to ensure that hydroxyl on the glycol and hydroxyl in the PVA form hydrogen bonds, so that intermolecular and intramolecular hydrogen bonds of the PVA are reduced, meanwhile, molecular chains of the PVA are mutually connected, the degree of compactness is increased, and the surface of the prepared film is smoother and smoother.
The semi-permeable membranes prepared in examples 2 to 6 were tested for contact angle, respectively, and the results are shown in FIG. 3. It can be seen that the amount of ethylene glycol in the film is related to the magnitude of the contact angle. When the content of ethylene glycol in the film is lower than 7%, the contact angle of deionized water on the surface of the film is gradually increased along with the increase of the content of ethylene glycol, when the content of ethylene glycol is 7-9%, the contact angle of deionized water on the surface of the film is gradually reduced along with the increase of the content of ethylene glycol, and when the content of ethylene glycol is 9-11%, the contact angle of deionized water on the surface of the film is gradually increased along with the addition of ethylene glycol.
The modified film (i.e., 7% ethylene glycol + 8% PVA film) with the most excellent performance was selected, and the rejection rate of the film to a sodium chloride solution (0.05mol/L) at 24 hours was measured. Drawing a standard curve of the relation between the quantity concentration of the sodium chloride solution substance and the conductivity, deducing the concentration of the permeation solution through the standard curve, and calculating the retention rate, wherein the retention rate can be calculated according to the following formula:
in the formula: CP-permeate concentration; CF-concentration of feed solution.
The test result is shown in figure 4, and it can be seen that the rejection rate of the 400 micron film to 0.05mol/L sodium chloride solution is 69.31% by selecting 7% ethylene glycol/PVA, which indicates that the salt filtering performance of the semipermeable membrane of the present invention is better.
Example 7
The raw materials and the preparation method of the printable composite crosslinked semipermeable membrane material are the same as those in example 1, and the difference is only that the wet coating thickness in the coating process is controlled to be 100 μm.
Example 8
The raw materials and the preparation method of the printable composite crosslinked semipermeable membrane material are the same as those in example 1, and the difference is only that the wet coating thickness in the coating process is controlled to be 200 μm.
It should be understood that the above-described embodiments are merely examples for clarity of description and are not intended to limit the scope of the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This list is neither intended to be exhaustive nor exhaustive. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The printable composite cross-linking semipermeable membrane material is characterized in that the preparation raw material of the semipermeable membrane material comprises the following components in parts by weight:
0.4-2.4 parts by weight of hydrophilic polymer;
13-25 parts of polymer resin;
0.25-3.3 parts by weight of a crosslinking agent;
1-6 parts of an initiator;
5-35 parts of water.
2. The printable composite crosslinked semipermeable membrane material according to claim 1, wherein said hydrophilic polymer comprises polyvinyl alcohol (PVA) and/or hydroxyethyl cellulose (HEC).
3. The printable composite crosslinked semipermeable membrane material according to claim 1 or 2, wherein said polymeric resin comprises aqueous urethane (PU) and/or polymethacrylate emulsion (PMMA).
4. The printable composite crosslinked semipermeable membrane material according to any of claims 1-3, wherein said crosslinking agent comprises polyaldehydes, polyols or polyacids.
5. The printable composite crosslinked semipermeable membrane material according to any of claims 1-4, wherein said initiator comprises ammonium persulfate and/or potassium persulfate.
6. A method for preparing the printable composite crosslinked semipermeable membrane material according to any of claims 1-5, which comprises the steps of taking a selected amount of the hydrophilic polymer and dissolving in water to obtain a polymer solution, and adding a selected amount of the crosslinking agent, the polymeric resin, the initiator and water for uniform mixing.
7. The method for preparing the printable composite crosslinked semipermeable membrane material according to claim 6, wherein the mass concentration of the polymer solution is 5-10 wt%.
8. Use of the printable composite cross-linked semipermeable membrane material according to any of claims 1-5 in the field of water treatment.
9. A printable composite cross-linked semipermeable membrane, characterized by being prepared from the printable composite cross-linked semipermeable membrane material according to any of claims 1-5.
10. A method for preparing the printable composite cross-linked semipermeable membrane according to claim 9, which comprises the steps of coating the printable composite cross-linked semipermeable membrane material according to any one of claims 1 to 5 to obtain a liquid membrane, and subjecting the liquid membrane to cross-linking treatment at 75-105 ℃ for 1-2h, cooling and drying.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6368646A (en) * | 1986-08-27 | 1988-03-28 | ダウ デンマーク アー／エス | Permeable porous polymer membrane having hydrophilic characteristic, and its production and use |
| TW200624448A (en) * | 2005-01-13 | 2006-07-16 | Mingchi Inst Of Technology | The preparation of blend polyvinyl alcohol with polyacrylic acid polymer with ultrahigh ionic conductivity polymer membrane |
| CN102504117A (en) * | 2011-09-27 | 2012-06-20 | 浙江大学 | Aquagel with high water absorbing capacity and preparation method thereof |
| CN105363357A (en) * | 2014-09-02 | 2016-03-02 | 中国石油化工集团公司 | Polyvinyl alcohol membrane with diene compound as cross-linking agent and preparation method of polyvinyl alcohol membrane |
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2021
- 2021-06-09 CN CN202110641279.1A patent/CN113527730B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6368646A (en) * | 1986-08-27 | 1988-03-28 | ダウ デンマーク アー／エス | Permeable porous polymer membrane having hydrophilic characteristic, and its production and use |
| TW200624448A (en) * | 2005-01-13 | 2006-07-16 | Mingchi Inst Of Technology | The preparation of blend polyvinyl alcohol with polyacrylic acid polymer with ultrahigh ionic conductivity polymer membrane |
| CN102504117A (en) * | 2011-09-27 | 2012-06-20 | 浙江大学 | Aquagel with high water absorbing capacity and preparation method thereof |
| CN105363357A (en) * | 2014-09-02 | 2016-03-02 | 中国石油化工集团公司 | Polyvinyl alcohol membrane with diene compound as cross-linking agent and preparation method of polyvinyl alcohol membrane |
Non-Patent Citations (2)
| Title |
|---|
| AYMAN M. ATTA ET AL.: ""Swelling Characteristics of pH- and Thermo-Sensitive Crosslinked Poly(Vinyl Alcohol) Grafts"", vol. 13 * |
| WALEED K. EL-ZAWAWY ET AL.: "\"Preparation and Characterization of Novel Polymer Hydrogel from Industrial Waste and Copolymerization of Poly(vinyl alcohol) and Polyacrylamide\"", vol. 124 * |
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