CN111041835A - Method for preparing super-wetting material with pH response by taking fabric as raw material - Google Patents
Method for preparing super-wetting material with pH response by taking fabric as raw material Download PDFInfo
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- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
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Abstract
A method for preparing super-wetting material with pH response by taking fabric as raw material is characterized in that 3-aminopropyl triethoxysilane and methyl methacrylate are dissolved in a solvent, and are stirred and reacted for 2 to 3 hours at 50 to 60 ℃ to obtain mixed solution; adding 3- (trimethoxysilyl) propyl acrylate and azobisisobutyronitrile into the mixed solution, heating to 70-90 ℃, and reacting at constant temperature for 8-9.5 h; adding silica particles into the reacted solution, and heating for 1.5-2 h at 50-55 ℃ after dispersion to obtain a modified suspension; and soaking the fabric in the modified suspension, and then drying to obtain the fabric with pH response. The super-wetting fabric is obtained by using the fabric with low cost as the raw material under mild reaction conditions, and can be converted for many times between super-hydrophobic/super-oleophilic and super-hydrophilic/underwater super-oleophobic, so that a good idea is provided for an oil-water separation material.
Description
Technical Field
The invention belongs to the technical field of preparation and application of response type super-wetting materials, and particularly relates to a method for preparing a pH-response super-wetting material by taking a fabric as a raw material.
Background
The fabric is widely applied in daily life, but the fabric is very easy to wet due to a large amount of hydroxyl contained on the surface, and the application range is limited due to single property, so that the fabric cannot meet the requirements of people. With the rapid development of economy, the environmental problems (especially petroleum leakage, ocean oil spill and chemical leakage generated in industrialization) are increasingly serious. In order to solve this problem, a novel, highly efficient and multifunctional oil-water separation wetting material is urgently needed.
From the view point of interface science and bionics, the special wettability material has wide application prospect in the aspect of oil-water separation. The special wettability materials are divided into three types, namely oil removing materials, water removing materials and intelligent switchable materials. The oil removing material is a super-hydrophobic-super-oleophilic material, and effectively separates oil from an oil-water mixture. However, such wetted surfaces are susceptible to contamination or clogging by oils, especially high viscosity oils, which themselves present immeasurable amounts of bacteria and other contaminants. In view of the situation, there is a need for a "water removal" material, which has a certain application in oil-water separation, but still faces a great challenge in the separation of more complex oil-water mixtures, and therefore, the development of intelligent switchable materials will be a hot research point in oil-water separation.
With the continuous development of science and technology and the higher requirements of people on materials, intelligent switchable materials are receiving attention, and the materials are developed by a plurality of researchers. The intelligent switchable material is subjected to surface wettability conversion under the stimulation condition of an external environment. The stimulus response is very important to control the physical action and chemical composition of the material surface. Such as pH, light, different solvents, solvent mass, temperature, magnetic field, electric field, gas, pressure, and various stimuli. Among these stimuli, pH-responsive wetting materials have attracted great interest to those in academia and industry because of their simplicity of operation, fast response times, no need for particularly complex equipment, ease of surface wetting, and cyclic switching. However, as far as the present is concerned, many reports have been made about pH-responsive materials, but most of them must be subjected to a corresponding pH solution wetting treatment before use, so as to obtain a desired wetted surface. And the material is modified by using a fluorine-containing substance, so that the material has serious influence on the health of human bodies and environmental pollution. Therefore, the preparation of the pH response super-wetting fabric has great research significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and aims to provide a method for preparing a super-wetting material with pH response by taking a fabric as a raw material, which is simple and easy to realize, does not need harsh reaction conditions and complex reaction equipment, directly uses the fabric with low cost as a reference raw material, can obtain the super-wetting surface material with pH response under mild reaction conditions through simple operation steps, can perform in-situ and ex-situ pH response, and can be repeatedly converted between super-hydrophilicity and super-hydrophobicity. In addition, the material does not use fluorine-containing compounds, thereby reducing secondary pollution and being beneficial to environmental protection.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for preparing a super-wetting material with pH response by taking a fabric as a raw material comprises the following steps:
dissolving 3-aminopropyltriethoxysilane and methyl methacrylate in a solvent, and stirring and reacting for 2-3 h at 50-60 ℃ to obtain a mixed solution;
step two, adding 3- (trimethoxysilyl) propyl acrylate and azobisisobutyronitrile into the mixed solution obtained in the step one under the stirring condition, heating to 70-90 ℃, and reacting for 8-9.5 hours at constant temperature;
step three, adding silicon dioxide particles into the solution reacted in the step two, and heating for 1.5-2 hours at 50-55 ℃ after dispersing to obtain modified suspension;
and step four, soaking the fabric into the suspension modified in the step three, and then drying to obtain the fabric with pH response.
The invention is further improved in that in the step one, the ratio of the 3-aminopropyltriethoxysilane to the methyl methacrylate is 0.7-0.8 mL to 0.4-0.6 mL.
In a further improvement of the invention, in the first step, the solvent is a mixture of distilled water and absolute ethyl alcohol.
The invention is further improved in that the volume ratio of the distilled water to the absolute ethyl alcohol is 10-15 mL: 10-18 mL.
The further improvement of the invention is that the ratio of the 3-aminopropyltriethoxysilane to the distilled water is 0.7-0.8 mL: 10-15 mL.
The further improvement of the invention is that in the second step, the ratio of 3- (trimethoxysilyl) propyl acrylate to azobisisobutyronitrile is 0.9-1.1 mL: 0.028-0.033 g.
The further improvement of the invention is that the ratio of the 3-aminopropyltriethoxysilane to the silica particles is 0.7-0.8 mL: 0.7 to 0.9 g.
The further improvement of the invention is that in the fourth step, the soaking time is 30-60 min.
The further improvement of the invention is that in the fourth step, the drying temperature is 80-100 ℃, and the drying time is 1-2.5 h.
Compared with the prior art, the invention has the following advantages:
1. the method adopts common low-cost fabric as a reference raw material, and prepares the pH-responsive super-wet fabric through mild reaction conditions.
2. According to the invention, a copolymer obtained by polymerizing MMA and KH570 monomers is used for replacing toxic fluorine-containing substances to obtain the intelligent fabric capable of being converted between super-hydrophobic/super-hydrophilic and super-hydrophilic/underwater super-oleophobic properties, so that the environmental pollution is reduced.
3. The preparation method is simple, has low requirements on equipment, does not relate to precise instruments, has mild reaction conditions, is easy to realize, and does not need harsh reaction conditions and complex reaction equipment.
4. The fabric prepared by the invention not only can separate simple two-phase oil-water mixture, but also can separate complex three-phase oil/water/oil mixture in situ.
5. The fabric prepared by the invention can separate two mutually soluble organic matters (phenol and anisole) through simple chemical reaction, and provides a new idea for separating the mutually soluble organic matters.
6. The super-wetting material prepared by the invention simultaneously shows in-situ pH responsiveness (the wettability of the fabric is changed along with the change of the pH value aqueous solution), wherein the fabric does not need to be treated in advance) and ex-situ pH responsiveness (the fabric is treated by the alkaline aqueous solution in advance).
7. The super-wetting material prepared by the invention can still keep excellent durability and chemical stability under severe environment (mechanical abrasion, saline solution and ultraviolet irradiation).
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 shows the change of wettability of the surface of the superhydrophobic fabric prepared in example 1 of the present invention to water after the fabric is treated with aqueous solutions having pH 1, pH 7 and pH 13 for 10 s. From left to right are respectively acidic (pH 1, methyl blue stain), neutral (pH 7, methylene blue stain) and basic (pH 13, methyl red stain), each drop side corresponding to its contact angle.
Fig. 2 is a graph showing changes in contact angle and sliding angle of a water drop on the surface of a superhydrophobic fabric prepared according to example 1 of the present invention after alternately treating the fabric with solutions having pH 1 and pH 13.
Fig. 3 is a scanning electron microscope image of the original fabric, the modified fabric and the modified fabric treated with the pH 1 acid solution and the pH 13 alkali solution in example 1 of the present invention. Wherein, the graph (a) is a surface topography graph of an original fabric, the graph (b) is a surface topography graph of a modified fabric, the graph (c) is a surface topography graph of the modified fabric after being treated by an acid solution with a pH of 1, the graph (d) is a surface topography graph of the modified fabric after being treated by an alkali solution with a pH of 13, the graph (e) is a partial enlarged graph of the graph (a), the graph (f) is a partial enlarged graph of the graph (b), the graph (g) is a partial enlarged graph of the graph (c), and the graph (h) is a partial enlarged graph of the graph (d).
Fig. 4 is a graph of the mechanical abrasion of the superhydrophobic fabric prepared in example 1 of the present invention under a weight of 100g carried by a 600# sandpaper, wherein (a) is a picture before abrasion and (b) is a picture after one cycle of abrasion.
Fig. 5 is a graph showing the change of contact angle and sliding angle of the corresponding abrasion distance after the superhydrophobic fabric prepared in example 1 of the invention is mechanically abraded.
Fig. 6 is a buoyancy test graph of the superhydrophobic fabric prepared in example 1 of the present invention in water. Wherein a is the surface of the fabric which is stable to water drops and floats on the water surface to form a sphere, n-hexane water drops are spread on the surface of the fabric, b is the fabric which bears the weight and stably floats on the water surface, c is a side view of a picture, and d is a side view of a picture b.
FIG. 7 is a diagram of a process for selectively separating different types of oil-water mixtures by using the superhydrophobic fabric prepared in example 1 of the invention. Wherein (a) - (d) are used for the separation process of light oil (n-hexane, yellow)/water mixture, and (e) - (h) are used for the separation process of heavy oil (dichloromethane, orange)/water mixture.
FIG. 8 is a graph of the separation efficiency and flux of the superhydrophobic fabric prepared in example 1 of the invention for separating oil-water mixtures of different types.
Fig. 9 is a macroscopic process diagram of the in-situ separation of a complex three-phase oil/water/oil mixture for the superhydrophobic fabric prepared in example 1 of the present invention. Wherein (a) to (b) are processes of separating dichloromethane from a three-phase system oil-water mixture, (c) is a process of adding an alkaline aqueous solution with pH of 13 to a separating device, (d) to (f) are processes of separating the aqueous solution from the three-phase system oil-water mixture, and (g) to (h) are results of final separation of the three-phase system oil-water mixture.
FIG. 10 is a process diagram of separating miscible organic substances (phenol and anisole) from the superhydrophobic fabric prepared in example 1 of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
Example 1
The preparation method of this example includes the following steps:
step one, dissolving 0.7mL of 3-Aminopropyltriethoxysilane (AMEO) and 0.5mL of Methyl Methacrylate (MMA) in a mixed solution of 10mL of distilled water and 10mL of anhydrous ethanol, and then heating and stirring at 50 ℃ for reaction for 3 hours;
step two, adding 1.0mL of 3- (trimethoxysilyl) propyl acrylate (KH570) and 0.03g of Azobisisobutyronitrile (AIBN) into the mixed solution in the step one under the stirring condition, and reacting for 8 hours at the constant temperature of 75 ℃;
step three, adding 0.9g of silicon dioxide particles into the solution reacted in the step two, performing ultrasonic dispersion for 20min at room temperature, and then stirring for 2h at 50 ℃ to obtain modified suspension;
and step four, soaking the cleaned fabric in the suspension liquid modified in the step three for 30min, and drying the soaked fabric in a drying oven at 80 ℃ for 2h to finally obtain the fabric with pH response.
Fig. 1 shows that the prepared superhydrophobic fabric has surface wettability change to water after being treated with aqueous solutions of pH 1, pH 7 and pH 13, respectively. From left to right are respectively acidic (pH 1, methyl blue stain), neutral (pH 7, methyl blue stain) and basic (pH 13, methyl red stain), each drop side corresponding to its contact angle. When acidic water droplets having a pH of 1 and neutral water droplets having a pH of 7 were dropped, the water droplets appeared well spherical, indicating that the fabric had good water repellency. On the contrary, when alkaline water droplets having a pH of 13 are dropped onto the surface thereof, the water droplets on the surface of the fabric spread rapidly due to hydrogen bonding between water molecules and the hydrolyzed carboxylate on the surface of the material. This phenomenon demonstrates the fabric surface to have good in situ responsiveness.
Fig. 2 is a graph showing the change of contact angle of a water drop on the surface of the prepared superhydrophobic fabric after the superhydrophobic fabric is alternately treated with solutions having pH 1 and pH 13. When the modified material is treated by an acid solution with pH of 1, the wettability of the surface of the modified material to water drops is not obviously changed, and the modified material still shows super-hydrophobicity, but after the modified material is treated by an alkali solution with pH of 13, the surface of the modified material shows super-hydrophilicity. In addition, after the fabric treated by the strong alkaline solution with the pH value of 13 is further treated by the strong acidic solution with the pH value of 1, the super-hydrophilicity of the fabric surface is restored to super-hydrophobicity, which shows that the material surface has good responsiveness.
Fig. 3 is a scanning electron microscope image of the original fabric, the modified fabric and the modified fabric after being treated with an acid solution having a pH of 1 and an alkali solution having a pH of 13, respectively. It can be seen that the fiber surface of the original fabric is relatively smooth, and after the modification of the coarse structure and the chemical components, it is found that a layer of polymer film is covered on the fiber surface, and the silica particles are unevenly distributed on the fiber surface, so that the roughness of the super-wet fabric is increased. After the modified super-hydrophobic fabric is subjected to acid-base soaking treatment, the change is not obvious, and the results show that the roughness of the structure on the fabric fiber is relatively stable and is not influenced by the harsh environment of strong acid and strong base, so that the hydrophobicity of the fabric is improved.
Fig. 4 is a graph of the mechanical abrasion of the prepared superhydrophobic fabric with a 600# sandpaper bearing weight of 100g weight, and it was found that the fabric was not significantly damaged by the sandpaper abrasion.
Fig. 5 is a graph showing the change of contact angle and sliding angle of the prepared superhydrophobic fabric after mechanical abrasion according to abrasion distance. The contact angle of the modified fabric was found not to change much after being worn by 220cm, good water repellency was still maintained, and the sliding angle was also relatively stable, indicating that the fabric had excellent mechanical stability.
Fig. 6 is a buoyancy test graph of the prepared superhydrophobic fabric in water. In order to study the bearing capacity of the modified fabric on the water surface, the modified fabric is cut into a circle and placed on the water surface, then water drops dyed by methyl blue and n-hexane dyed by methyl red are dripped on the other surface (top surface) of the modified fabric, and the water drops are found to form perfect spherical drops stably on the surface of the modified fabric, and the oil drops are paved on the surface of the fabric, as shown in a figure a, so that the excellent water-based performance is proved. And then, placing the modified cloth on the water surface, and lightly placing a heavy object in the center of the cloth to detect the maximum bearing capacity of the cloth. It was found that stable floating on the water surface without sinking (fig. b) and significant dents (fig. d) were produced, mainly due to the larger water contact angle, higher density of water(0.997g·cm-3) And greater surface tension (72.8mN · m)-1) Resulting in greater support and resulting in better load capacity.
FIG. 7 is a process diagram of the prepared superhydrophobic fabric for selectively separating different types of oil-water separation mixtures. When a mixture containing 25mL of n-hexane (yellow) and 25mL of water (blue) is poured into the inclined tube, the n-hexane first contacts the modified membrane with hydrophobic oleophilic properties, thus rapidly penetrating the membrane and flowing into the beaker at the bottom, while the blue water is locked on top of the membrane, thus separating the low density oil-water mixture. In contrast, for a high density oil-water mixture, a vertical separation device is selected for separation due to gravity. The mixed solution containing 30mL of water (blue) and 30mL of dichloromethane (orange) is poured into the assembled separating device, the dichloromethane rapidly reaches the bottom of the water and passes through the super-wet cloth, and the blue water is blocked on the surface of the cloth due to the excellent hydrophobic fabric, so that the purpose of oil-water separation is achieved.
FIG. 8 shows the separation efficiency and throughput of the prepared superhydrophobic fabric for separating different types of oil-water mixtures. It was found that all types of oil-water mixtures had separation efficiencies above 98.9% and high fluxes.
Fig. 9 is a macroscopic process diagram of the in-situ separation of a complex three-phase oil/water/oil mixture of the prepared superhydrophobic fabric. The prepared fabric was held between two glass tubes, then an oil-water mixture containing n-hexane (15mL, methyl orange dye), water (pH 7,15mL, methine blue dye) and dichloromethane (20mL, sudan triple dye) was poured into the tubes, and the dichloromethane at the bottom rapidly penetrated the smart responsive fabric by gravity into the beaker. However, since the resulting fabric has super-hydrophobicity and super-lipophilicity, neutral water cannot permeate through the fabric and is thus retained on the fabric. When an aqueous alkaline solution (pH 13, 15mL, phenolphthalein staining) was poured into the test tube, the originally blue aqueous solution in the tube became an alkaline solution (green) having a pH 12.7. As expected, the green water alkalised through the fabric a few seconds and gradually accumulated in another empty beaker, with the uppermost layer of red n-hexane still remaining in the tube, which is consistent with the cloth prepared being superhydrophilic and superhydrophobic under alkaline conditions. It is worth noting that the complex separation of light oil/water/heavy oil three-phase oil-water mixture is realized by changing the wettability of the cloth in situ in the whole separation process, which shows that the prepared intelligent super-wetting material can effectively separate the multi-phase oil-water mixture, thereby showing good pH responsiveness and excellent oil-water separation performance.
FIG. 10 is a process diagram of the prepared super-hydrophobic fabric for separating miscible organic matters (phenol and anisole). First, 3mL of anisole and 0.2g of phenol were dissolved in 20mL of n-hexane, a uniform organic phase was formed by sonication, and then a strongly basic aqueous solution (blue) was poured into the organic phase, whereby a mixture of two-phase various types of liquids was prepared. And a-c is the separation process of the mixed solution, the mixed solution prepared in advance is poured into a separation device, blue water is found to flow through a filter membrane and fall into a beaker below, an organic solution containing a large amount of n-hexane is blocked on the surface of the fabric due to the underwater super-oleophobic property of the fabric, and the organic phase is light pink and is oxidized due to the fact that a little phenol meets air. To check whether phenol is separated, a color reaction was selected for validation. The organic phase before separation was measured 5mL and 5mL FeCl was added thereto3The solution was shaken and bottom FeCl was found3The solution turns purple due to phenol encountering Fe3+The purple discoloration produces a color change reaction. Measuring 5mL of organic phase left in the device after the separation is finished, and adding 5mL of FeCl into the organic phase3The solution was shaken and bottom FeCl was found3The solution turns from yellow to green, which is considered to be that after the mixed organic phase contacts with the strong alkali solution, phenol reacts with the NaOH solution to generate sodium phenolate which is dissolved in the water phase and separated into a bottom beaker, and the color turns to green due to incomplete reaction or quinone formed by oxidation in the organic phase.
Example 2
Step one, dissolving 0.75mL of 3-aminopropyltriethoxysilane and 0.4mL of methyl methacrylate in a mixed solution of distilled water (12mL) and absolute ethyl alcohol (13mL), and then heating and stirring at 55 ℃ for reaction for 2.5 h;
step two, adding 1.0mL of 3- (trimethoxysilyl) propyl acrylate and 0.031g of azobisisobutyronitrile into the mixed solution obtained in the step one under the stirring condition, and reacting for 9 hours at a constant temperature (70 ℃);
step three, adding 0.7g of silicon dioxide particles into the solution reacted in the step two, performing ultrasonic dispersion for 15min at room temperature, and then stirring for 1.5h at 55 ℃ to obtain modified suspension;
and step four, soaking the cleaned fabric in the modified suspension liquid obtained in the step three for 40min, and drying the soaked fabric in a drying oven at 90 ℃ for 2.5h to finally obtain the fabric with pH response.
Example 3
Step one, dissolving 0.8mL of 3-aminopropyltriethoxysilane and 0.6mL of methyl methacrylate in a mixed solution of distilled water (13mL) and absolute ethyl alcohol (15mL), and then heating and stirring at 60 ℃ for reaction for 2 h;
step two, adding 1.1mL of 3- (trimethoxysilyl) propyl acrylate and 0.032g of azobisisobutyronitrile into the mixed solution obtained in the step one under the stirring condition, and reacting for 9 hours at constant temperature (80 ℃);
step three, adding 0.7g of silicon dioxide particles into the solution reacted in the step two, performing ultrasonic dispersion for 15min at room temperature, and then stirring for 2h at 50 ℃ to obtain modified suspension;
and step four, soaking the cleaned fabric in the modified suspension liquid obtained in the step three for 40min, and drying the soaked fabric in a drying oven at 100 ℃ for 1h to finally obtain the fabric with pH response.
Example 4
Step one, dissolving 0.72mL of 3-aminopropyltriethoxysilane and 0.48mL of methyl methacrylate in a mixed solution of distilled water (15mL) and absolute ethyl alcohol (18mL), and then heating and stirring at 50 ℃ for reaction for 3 hours;
step two, adding 0.9mL of 3- (trimethoxysilyl) propyl acrylate and 0.03g of azobisisobutyronitrile into the mixed solution in the step one under the stirring condition, and reacting for 8.5h at constant temperature (90 ℃);
step three, adding 0.8g of silicon dioxide particles into the solution reacted in the step two, performing ultrasonic dispersion for 20min at room temperature, and then stirring for 1.5h at 55 ℃ to obtain modified suspension;
and step four, soaking the cleaned fabric in the suspension liquid modified in the step three for 50min, and drying the soaked fabric in a drying oven for 1h at 100 ℃ to finally obtain the fabric with pH response.
Example 5
Step one, dissolving (0.75mL) 3-aminopropyltriethoxysilane and (0.55mL) methyl methacrylate in a mixed solution of distilled water (14mL) and absolute ethyl alcohol (17mL), and then heating and stirring at 55 ℃ for reacting for 2.5 h;
step two, adding 1.0mL of 3- (trimethoxysilyl) propyl acrylate and 0.033g of azobisisobutyronitrile into the mixed solution in the step one under the stirring condition, and reacting for 8.5 hours at constant temperature (85 ℃);
step three, adding 0.8g of silicon dioxide particles into the solution reacted in the step two, performing ultrasonic dispersion for 30min at room temperature, and then stirring for 2h at 50 ℃ to obtain modified suspension;
and step four, soaking the cleaned fabric in the suspension liquid modified in the step three for 50min, and drying the soaked fabric in a drying oven at 90 ℃ for 1.5h to finally obtain the fabric with pH response.
Example 6
Step one, dissolving (0.78mL) mL of 3-aminopropyltriethoxysilane and (0.58mL) mL of methyl methacrylate in a mixed solution of distilled water (14.5mL) and absolute ethyl alcohol (17.5mL), and then heating and stirring at 60 ℃ for reacting for 2 hours;
step two, adding 0.9mL of 3- (trimethoxysilyl) propyl acrylate and 0.028g of azobisisobutyronitrile into the mixed solution in the step one under the stirring condition, and reacting for 9.5 hours at constant temperature (88 ℃);
step three, adding 0.8g of silicon dioxide particles into the solution reacted in the step two, performing ultrasonic dispersion for 30min at room temperature, and then stirring for 1.5h at 55 ℃ to obtain modified suspension;
and step four, soaking the cleaned fabric in the suspension liquid modified in the step three for 1h, and then drying the soaked fabric in a drying oven at the temperature of 80 ℃ for 2h to finally obtain the fabric with pH response.
The super-hydrophobic fabric with pH responsiveness prepared by the invention can be used for selective oil-water separation.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (9)
1. A method for preparing a super-wetting material with pH response by taking a fabric as a raw material is characterized by comprising the following steps:
dissolving 3-aminopropyltriethoxysilane and methyl methacrylate in a solvent, and stirring and reacting for 2-3 h at 50-60 ℃ to obtain a mixed solution;
step two, adding 3- (trimethoxysilyl) propyl acrylate and azobisisobutyronitrile into the mixed solution obtained in the step one under the stirring condition, heating to 70-90 ℃, and reacting for 8-9.5 hours at constant temperature;
step three, adding silicon dioxide particles into the solution reacted in the step two, and heating for 1.5-2 hours at 50-55 ℃ after dispersing to obtain modified suspension;
and step four, soaking the fabric into the suspension modified in the step three, and then drying to obtain the fabric with pH response.
2. The method for preparing the super-wetting material with pH response by using the fabric as the raw material according to claim 1, wherein in the step one, the ratio of the 3-aminopropyltriethoxysilane to the methyl methacrylate is 0.7-0.8 mL: 0.4-0.6 mL.
3. The method for preparing super-wetting material with pH response by using fabric as raw material according to claim 1, wherein in the first step, the solvent is a mixture of distilled water and absolute ethyl alcohol.
4. The method for preparing the super-wetting material with pH response by using the fabric as the raw material according to claim 3, wherein the volume ratio of the distilled water to the absolute ethyl alcohol is 10-15 mL: 10-18 mL.
5. The method for preparing the super-wetting material with pH response by using the fabric as the raw material according to claim 1, wherein the ratio of 3-aminopropyltriethoxysilane to distilled water is 0.7-0.8 mL: 10-15 mL.
6. The method for preparing the super-wetting material with pH response by using the fabric as the raw material according to claim 1, wherein in the second step, the ratio of 3- (trimethoxysilyl) propyl acrylate to azobisisobutyronitrile is 0.9-1.1 mL: 0.028-0.033 g.
7. The method for preparing the super-wetting material with pH response by taking the fabric as the raw material as claimed in claim 1, wherein the ratio of 3-aminopropyltriethoxysilane to silica particles is 0.7-0.8 mL: 0.7 to 0.9 g.
8. The method for preparing the super-wetting material with pH response by using the fabric as the raw material according to claim 1, wherein in the fourth step, the soaking time is 30-60 min.
9. The method for preparing the super-wetting material with pH response by using the fabric as the raw material according to claim 1, wherein in the fourth step, the drying temperature is 80-100 ℃ and the drying time is 1-2.5 h.
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