Preparation method of directional transportation cotton fabric for automatic pump type dye filtration

Abstract

The invention discloses a preparation method of a directional transportation cotton fabric for automatic pump type dye filtration, which comprises the following steps: synthesizing a water-insoluble CA-CD compound through esterification reaction, reacting the CA-CD compound with dopamine hydrochloride to obtain a PDA-CA-CD dispersion liquid, and spraying the PDA-CA-CD dispersion liquid on the single side of the cotton fabric to enable the single side to have hydrophilicity; then reacting SiC with dopamine hydrochloride to obtain a PDA-coated SiC dispersion liquid, and spraying the PDA-coated SiC dispersion liquid on the other side of the cotton fabric to obtain a cotton fabric with one hydrophilic side and one hydrophobic side; the cotton fabric has a directional transportation function, no energy loss exists in the directional transportation process, dye filtering can be conducted through automatic pump type active transmission, and the dye filtering speed is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of functional textiles, and in particular relates to a method for preparing a directional transport cotton fabric for automatic pump type dye filtering. Background Art

[0002] In recent years, as the country attaches great importance to environmental protection issues, water quality has become the focus of people's attention. Dye wastewater, which accounts for a large proportion of water pollution sources, has brought many ecological and environmental problems. Therefore, scientific researchers have invested a lot of manpower, material resources, and funds to develop dye wastewater adsorption and filtration materials. At present, the commonly used adsorption materials mainly include adsorption resins, activated carbon, bio-based adsorption materials, etc., but the adsorption materials have problems such as low reuse rate and complex elution. Commonly used filtration membranes mainly include hydrophilic polyethersulfone microporous membranes, PVDF membranes, reverse osmosis membranes, etc., but the power of the above membranes in the filtration process mainly comes from the gravity of the liquid itself, so when the pore size of the membrane is relatively small, or the size of the pollutant particles is large, the filtration speed is significantly reduced, and even additional extraction devices are required, which greatly limits the application of filter materials. Summary of the invention

[0003] In order to solve the above problems existing in the prior art, the present invention provides a method for preparing automatic pump type directional transport cotton fabric for dye filtering.

[0004] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0005] A method for preparing an automatic pump type directional transport cotton fabric for dye filtration, comprising:

[0006] Step 1: weigh β-cyclodextrin, citric acid and potassium dihydrogen phosphate according to the ratio and add them into deionized water in sequence to make them completely dissolved and mixed evenly; wherein the mass ratio of β-cyclodextrin, citric acid, potassium dihydrogen phosphate and water is 0.9~1.2:0.8~1.5:0.15:7~10;

[0007] Step 2: reacting the mixed solution at a temperature of 140°C ± 5 for 4.5-5.5 hours to obtain a water-insoluble CA-CD cross-linked polymer;

[0008] Step 3: Dispersing the CA-CD cross-linked polymer in a Tris-HCl buffer solution and stirring to form a dispersion, adding dopamine hydrochloride to the dispersion, stirring and reacting at room temperature for 7-10 hours to obtain a PDA@CA-CD dispersion; wherein the mass ratio of the CA-CD cross-linked polymer to the Tris-HCl buffer solution is 0.045-0.058:1; the mass ratio of the Tris-HCl buffer solution to dopamine hydrochloride is: 1:0.002-0.0025;

[0009] Step 4: using a single-sided electrostatic spraying method to evenly spray the PDA@CA-CD dispersion onto one side of the cotton fabric, and after drying, obtain a PDA@CA-CD single-sided hydrophilic cotton fabric;

[0010] Step 5: Take nano-SiC and disperse it in deionized water, add sodium hexametaphosphate dispersant to form a dispersion, add Tris-HCl buffer solution to the dispersion; then add dopamine hydrochloride to the dispersion, stir evenly to obtain PDA@SiC dispersion; wherein the mass ratio of nano-SiC, deionized water and sodium hexametaphosphate is 0.02~0.025:1:0.009~0.012; the mass ratio of deionized water to Tris-HCl buffer solution is: 8.3:1; the mass ratio of dopamine hydrochloride to deionized water is 0.001~0.003:1;

[0011] Step 6: Use a single-sided electrostatic spraying method to evenly spray the PDA@SiC dispersion onto the other side of the cotton fabric, and after drying, obtain a cotton fabric that is hydrophobic on one side and hydrophilic on the other side and has an automatic pump-type dye filtering and directional transportation function.

[0012] Furthermore, after step 6, the step further includes:

[0013] The polydimethylsiloxane / curing agent is dissolved in the n-hexane solution and mixed evenly, and then the mixed solution is sprayed on the other side of the cotton fabric by electrostatic spraying, and then dried at a temperature of 70-90° C. for 4-5 hours; wherein the mass ratio of PDMS, curing agent and n-hexane solution is 9-11:0.9-1.1:650-750.

[0014] Furthermore, the concentration of the Tris-HCl buffer solution in step 3 and step 5 is 48-52 mmol / L, and the pH is 8-8.5.

[0015] Furthermore, the spraying volume of the PDA@CA-CD dispersion on each square decimeter of cotton fabric is 8-28 mL.

[0016] Furthermore, the spraying volume of the PDA@SiC dispersion on each square decimeter of cotton fabric is 8-32 mL.

[0017] Furthermore, the process parameters of the single-sided electrostatic spraying method in step 4 and step 6 are: spinning voltage is 10~15V, receiving distance is 5~6cm, spinning rate is 0.1~0.15mL / min; needle diameter is 10mm, round-trip distance is 120mm, and moving speed is 10mm / s.

[0018] Furthermore, the spraying volume of the mixed solution on each square decimeter of cotton fabric is 8-24 mL.

[0019] Furthermore, the static contact angle of the hydrophobic side of the cotton fabric to water is 135-150°.

[0020] Beneficial effects of the present invention:

[0021] 1. The present invention utilizes the asymmetric wetting principle to prepare a cotton fabric with one side being hydrophilic and the other side being hydrophobic and having a unidirectional moisture-conducting function, so that the cotton fabric has a directional transport function. The directional transport process has no energy loss, and the dye can be filtered by active transmission in an automatic pump type, thereby increasing the dye filtering speed, and can be widely promoted and applied.

[0022] 2. In order to improve the removal rate of dyes, a water-insoluble CA-CD cross-linked product is added to form a host-guest encapsulation effect with the dyes;

[0023] 3. The present invention introduces the mussel-like adhesion behavior and utilizes the self-adhesion behavior of polydopamine to effectively combine the hydrophilic and hydrophobic functional layers with the cotton fabric substrate;

[0024] 4. The cotton fabric prepared by the present invention has good mechanical properties, stability and reusability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the infrared spectrum of CA-CD cross-linked polymer and β-cyclodextrin;

[0026] Figure 2(a) is a water drop image with a hydrophobic layer on cotton fabric;

[0027] Figure 2(b) is a picture of a water droplet with the hydrophilic layer of cotton fabric on top;

[0028] Figure 3 (a) is a SEM image of the hydrophilic side of cotton fabric;

[0029] Figure 3(b) is a SEM image of the hydrophobic side of the cotton fabric;

[0030] Figure 4 This is the static contact angle measurement diagram of the hydrophobic side of cotton fabric;

[0031] Figure 5 This is a graph showing the desorption-adsorption cycle results of the cotton fabric of the present invention. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0033] Example 1

[0034] The embodiment of the present invention discloses a method for preparing an automatic pump type directional transport cotton fabric for dye filtration, which specifically comprises the following steps:

[0035] Step 1: Weigh 12 g of β-cyclodextrin, 15 g of citric acid and 1.5 g of catalyst potassium dihydrogen phosphate, add them into 100 mL of deionized water in sequence, and ultrasonicate in an ultrasonic cleaner until the mixture is completely dissolved.

[0036] Step 2: Pour the mixed solution into a polytetrafluoroethylene evaporating dish, place it in a forced air drying oven, and react at 135°C for 5.5 hours to obtain a water-insoluble CA-CD cross-linked polymer; finally, wash the cross-linked polymer repeatedly with deionized water to remove unreacted raw materials and impurities, and dry it at 40°C to constant weight.

[0037] Step 3: Under magnetic stirring conditions, weigh 2.32 g of CA-CD cross-linked polymer and disperse it in 40 mL of 50 mmol / L Tris-HCl buffer solution with a pH of 8.5 to form a dispersion. Add 0.1 g of dopamine hydrochloride to the dispersion and stir the reaction at room temperature for 10 h to obtain a PDA@CA-CD dispersion.

[0038] Step 4: At room temperature and humidity of 40%-50%, 28 mL of PDA@CA-CD dispersion was evenly sprayed onto one side of a cotton fabric with an area of ​​1 dm × 1 dm by single-sided electrostatic spraying. After drying at 40 °C, PDA@CA-CD single-sided hydrophilic cotton fabric was obtained. The process parameters of the single-sided electrostatic spraying method were as follows: spinning voltage 15 kV, receiving distance 6 cm, spinning rate 0.15 mL / min, needle diameter 10 mm, round-trip distance 120 mm, and moving speed 10 mm / s.

[0039] Step 5: Weigh 2.5 g of nano-SiC and disperse it in 100 mL of deionized water, add 1.2 g of sodium hexametaphosphate dispersant, disperse the mixture by ultrasonic oscillator for 1 hour to form a dispersion, and add 12 mL of 50 mmol / L Tris-HCl buffer solution to the dispersion; then add 0.3 g of dopamine hydrochloride to the dispersion, and obtain a black PDA@SiC dispersion after magnetic stirring for 1 hour.

[0040] Step 6: At room temperature and humidity of 40%-50%, 32 mL of PDA@SiC dispersion was evenly sprayed onto the other side of a cotton fabric with an area of ​​1 dm × 1 dm by a single-sided electrostatic spraying method. After drying at 40°C, a cotton fabric with a certain roughness and automatic pump-type dye filtration and directional transport function was obtained. One side of the cotton fabric was hydrophobic and the other side was hydrophilic. The process parameters of the single-sided electrostatic spraying method were: spinning voltage 15 kV, receiving distance 6 cm, spinning rate 0.15 mL / min, needle diameter 10 mm, round-trip distance 120 mm, and moving speed 10 mm / s.

[0041] Step 7: Dissolve 10g of polydimethylsiloxane and 1g of curing agent in 750mL of n-hexane solution by electrostatic spraying and mix evenly, then use electrostatic spraying to evenly spray 24mL of the mixture onto the other side of the cotton fabric with an area of ​​1dm×1dm, that is, the same side as the spraying surface in step 6, and then dry it at 70°C for 5h to enhance the hydrophobicity of the cotton fabric loaded with SiC; wherein the process parameters of the electrostatic spraying method are: spinning voltage 15kV, receiving distance 6cm, spinning rate 0.15mL / min, needle diameter 10mm, round-trip distance 120mm, and moving speed 10mm / s.

[0042] Among them, the model of polydimethylsiloxane and curing agent is Dow Corning DC184.

[0043] Example 2

[0044] The embodiment of the present invention discloses a method for preparing an automatic pump type directional transport cotton fabric for dye filtration, which specifically comprises the following steps:

[0045] Step 1: Weigh 9 g of β-cyclodextrin, 8 g of citric acid and 1.5 g of catalyst potassium dihydrogen phosphate, add them into 70 mL of deionized water in sequence, and ultrasonicate in an ultrasonic cleaner until the mixture is completely dissolved.

[0046] Step 2: Pour the mixed solution into a polytetrafluoroethylene evaporating dish, place it in a forced air drying oven, and react at 145°C for 4.5 hours to obtain a water-insoluble CA-CD cross-linked polymer; finally, wash the cross-linked polymer repeatedly with deionized water to remove unreacted raw materials and impurities, and dry it at 40°C to constant weight.

[0047] Step 3: Under magnetic stirring conditions, weigh 1.35 g of CA-CD cross-linked polymer and disperse it in 30 mL of 50 mmol / L Tris-HCl buffer solution with a pH of 8.5 to form a dispersion. Add 0.06 g of dopamine hydrochloride to the dispersion and stir the reaction at room temperature for 7 hours to obtain a PDA@CA-CD dispersion.

[0048] Step 4: At room temperature and humidity of 40%-50%, 8 mL of PDA@CA-CD dispersion was evenly sprayed onto one side of a cotton fabric with an area of ​​1dm×1dm using a single-sided electrostatic spraying method, and dried at 40°C to obtain a PDA@CA-CD single-sided hydrophilic cotton fabric; the process parameters of the single-sided electrostatic spraying method were: spinning voltage 10 kV, receiving distance 5 cm, spinning rate 0.1 mL / min, needle diameter 10 mm, round-trip distance 120 mm, and moving speed 10 mm / s.

[0049] Step 5: Weigh 1.6 g of nano-SiC and disperse it in 80 mL of deionized water, add 0.72 g of sodium hexametaphosphate dispersant, disperse the mixture by ultrasonic oscillator for 1 hour to form a dispersion, and add 9.6 mL of 50 mmol / L Tris-HCl buffer solution to the dispersion; then add 0.08 g of dopamine hydrochloride to the dispersion, and obtain a black PDA@SiC dispersion after magnetic stirring for 1 hour.

[0050] Step 6: At room temperature and humidity of 40%-50%, 8 mL of PDA@SiC dispersion was evenly sprayed onto the other side of a cotton fabric with an area of ​​1 dm × 1 dm by a single-sided electrostatic spraying method. After drying at 40°C, a cotton fabric with a certain roughness and automatic pump-type dye filtration and directional transport function was obtained. One side of the cotton fabric was hydrophobic and the other side was hydrophilic. The process parameters of the single-sided electrostatic spraying method were: spinning voltage 10 kV, receiving distance 5 cm, spinning rate 0.1 mL / min, needle diameter 10 mm, round-trip distance 120 mm, and moving speed 10 mm / s.

[0051] Step 7: Use electrostatic spraying to dissolve 10g of polydimethylsiloxane and 1g of curing agent in 650mL of n-hexane solution and mix evenly, then use electrostatic spraying to evenly spray 8mL of the mixture onto the other side of the cotton fabric with an area of ​​1dm×1dm, that is, the same side as the spraying surface in step 6, and then dry it at 90°C for 4h to enhance the hydrophobicity of the cotton fabric loaded with SiC; the process parameters of the electrostatic spraying method are: spinning voltage 10kV, receiving distance 5cm, spinning rate 0.1mL / min, needle diameter 10mm, round-trip distance 120mm, and moving speed 10mm / s.

[0052] Among them, the model of polydimethylsiloxane and curing agent is Dow Corning DC184.

[0053] Example 3

[0054] The embodiment of the present invention discloses a method for preparing an automatic pump type directional transport cotton fabric for dye filtration, which specifically comprises the following steps:

[0055] Step 1: Weigh 10 g of β-cyclodextrin, 12 g of citric acid and 1.5 g of catalyst potassium dihydrogen phosphate, add them into 80 mL of deionized water in sequence, and ultrasonicate in an ultrasonic cleaner until the mixture is completely dissolved.

[0056] Step 2: Pour the mixed solution into a polytetrafluoroethylene evaporating dish, place it in a forced air drying oven, and react at 140°C for 5 hours to obtain a water-insoluble CA-CD cross-linked polymer; finally, wash the cross-linked polymer repeatedly with deionized water to remove unreacted raw materials and impurities, and dry it at 40°C to constant weight.

[0057] Step 3: Under magnetic stirring conditions, weigh 1.75 g of CA-CD cross-linked polymer and disperse it in 35 mL of 50 mmol / L Tris-HCl buffer solution with a pH of 8.5 to form a dispersion. Add 0.08 g of dopamine hydrochloride to the dispersion and stir the reaction at room temperature for 8 h to obtain a PDA@CA-CD dispersion.

[0058] Step 4: At room temperature and humidity of 40%-50%, 18 mL of PDA@CA-CD dispersion was evenly sprayed onto one side of a cotton fabric with an area of ​​1 dm × 1 dm using a single-sided electrostatic spraying method, and dried at 40°C to obtain a PDA@CA-CD single-sided hydrophilic cotton fabric; the process parameters of the single-sided electrostatic spraying method were as follows: spinning voltage 13 kV, receiving distance 5.5 cm, spinning rate 0.12 mL / min, needle diameter 10 mm, round-trip distance 120 mm, and moving speed 10 mm / s.

[0059] Step 5: Weigh 2.07 g of nano-SiC and disperse it in 90 mL of deionized water, add 0.99 g of sodium hexametaphosphate dispersant, disperse the mixture by ultrasonic oscillator for 1 hour to form a dispersion, and add 10.8 mL of 50 mmol / L Tris-HCl buffer solution to the dispersion; then add 0.18 g of dopamine hydrochloride to the dispersion, and stir magnetically for 1 hour to obtain a black PDA@SiC dispersion.

[0060] Step 6: At room temperature and humidity of 40%-50%, 20 mL of PDA@SiC dispersion was evenly sprayed onto the other side of a cotton fabric with an area of ​​1 dm × 1 dm by a single-sided electrostatic spraying method. After drying at 40°C, a cotton fabric with a certain roughness and automatic pump-type dye filtration and directional transport function was obtained. One side of the cotton fabric was hydrophobic and the other side was hydrophilic. The process parameters of the single-sided electrostatic spraying method were: spinning voltage 13 kV, receiving distance 5.5 cm, spinning rate 0.12 mL / min, needle diameter 10 mm, round-trip distance 120 mm, and moving speed 10 mm / s.

[0061] Step 7: Dissolve 10g of polydimethylsiloxane and 1g of curing agent in 700mL of n-hexane solution by electrostatic spraying and mix evenly, then use electrostatic spraying to evenly spray 16mL of the mixture onto the other side of the cotton fabric with an area of ​​1dm×1dm, that is, the same side as the spraying surface in step 6, and then dry it at 80°C for 4.5h to enhance the hydrophobicity of the cotton fabric loaded with SiC; wherein the process parameters of the electrostatic spraying method are: spinning voltage 13kV, receiving distance 5.5cm, spinning rate 0.12mL / min, needle diameter 10mm, round-trip distance 120mm, and moving speed 10mm / s.

[0062] Among them, the model of polydimethylsiloxane and curing agent is Dow Corning DC184.

[0063] The cotton fabric with automatic pump-type dye filtration and directional transport function prepared by the present invention was characterized, and the results are as follows: Figures 1 to 5 As shown:

[0064] The chemical structure of the insoluble CA-CD cross-linked polymer was determined and analyzed using Fourier transform infrared spectroscopy (FTIR). Figure 1 As shown, the infrared spectrum of CA-CD is compared with that of β-CD. −1 It was confirmed to be the stretching vibration of the hydroxyl group at 1721 cm −1 The characteristic absorption peak at corresponds to the stretching vibration of the carbon-oxygen double bond (C=O) of the carboxyl or ester group in the CA-CD cross-linked polymer, indicating the successful progress of the esterification cross-linking reaction and the successful preparation of CA-CD through the dehydration condensation reaction.

[0065] like Figure 2(a) and 2(b) As shown in the figure, the directional transport performance of cotton fabric was characterized by using a liquid moisture management tester. Figure 2(a) is a water drop image with the hydrophobic layer of cotton fabric on top; Figure 2(b) is a water drop image with the hydrophilic layer of cotton fabric on top. The results show that moisture can be directed from the hydrophobic side of the cotton fabric to the hydrophilic side, but not in the reverse direction, proving that it has directional transport performance.

[0066] At the same time, the microstructure and wettability of cotton fabrics were characterized by scanning electron microscopy and contact angle measurement. The characterization results of scanning electron microscopy are as follows: Figure 3(a) and 3(b) As shown, Figure 3(a) is the SEM image of the hydrophilic side of the cotton fabric; Figure 3(b) is the SEM image of the hydrophobic side of the cotton fabric; it can be seen from the figure that the cotton fabric surface has a uniform rough morphology, and granular CA-CD cross-linked polymer can be seen in the SEM image of the hydrophilic side of the cotton fabric, and granular SiC can be seen in the SEM image of the hydrophobic side of the cotton fabric, indicating that the reaction process of the present invention has been carried out.

[0067] like Figure 4 As shown in the figure, the static contact angle of the hydrophobic side of the cotton fabric to water measured by the contact angle meter is between 136° and 137°. And it has been verified by experiments that the static contact angle of the hydrophobic side of the cotton fabric to water is optimal between 135° and 150°. When the static contact angle is less than 135°, the directional transport function is weak, and it takes a long time to filter the same volume of solution; when the static contact angle is greater than 150°, the transport function cannot be achieved.

[0068] In addition, by comparing the filtration performance of the cotton fabric with hydrophilicity on both sides and the cotton fabric with hydrophilicity on one side and hydrophobicity on the other side prepared by the present invention for the methylene blue solution, the results are shown in Table 1. When filtering the same volume of methylene blue solution, the cotton fabric prepared by the present invention takes a shorter time to filter the same volume of methylene blue solution, and in the same time, the volume of the filtered solution is larger.

[0069] Table 1 Parameters related to filtration test Fabric Type Filtrate permeation volume (ml) (same time) Filtration time (s) (same volume) Adsorption capacity (mg / g) Original cloth 4.2 90 0.408 Hydrophilic fabric on both sides 4.5 110 0.519 One-way moisture-conducting cloth (prepared by the present invention) 5.5 90 0.422

[0070] In addition, the cotton fabric prepared by the present invention has reusability, such as Figure 5 As shown in Figure 2, after 7 desorption-adsorption cycles, the adsorption efficiency still reached 92 ± 1.0%.

[0071] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A method for preparing a directional transport cotton fabric for automatic pump dye filtration, characterized in that: include: Step 1: weigh β-cyclodextrin, citric acid and potassium dihydrogen phosphate according to the ratio and add them into deionized water in sequence to make them completely dissolved and mixed evenly; wherein the mass ratio of β-cyclodextrin, citric acid, potassium dihydrogen phosphate and water is 0.9~1.2:0.8~1.5:0.15:7~10; Step 2: reacting the mixed solution at a temperature of 140°C ± 5 for 4.5-5.5 hours to obtain a water-insoluble CA-CD cross-linked polymer; Step 3: Dispersing the CA-CD cross-linked polymer in a Tris-HCl buffer solution and stirring to form a dispersion, adding dopamine hydrochloride to the dispersion, stirring and reacting at room temperature for 7-10 hours to obtain a PDA@CA-CD dispersion; wherein the mass ratio of the CA-CD cross-linked polymer to the Tris-HCl buffer solution is 0.045-0.058:1; the mass ratio of the Tris-HCl buffer solution to dopamine hydrochloride is: 1:0.002-0.0025; Step 4: using a single-sided electrostatic spraying method to evenly spray the PDA@CA-CD dispersion onto one side of the cotton fabric, and after drying, obtain a PDA@CA-CD single-sided hydrophilic cotton fabric; Step 5: Take nano-SiC and disperse it in deionized water, add sodium hexametaphosphate dispersant to form a dispersion, add Tris-HCl buffer solution to the dispersion; then add dopamine hydrochloride to the dispersion, stir evenly to obtain PDA@SiC dispersion; wherein the mass ratio of nano-SiC, deionized water and sodium hexametaphosphate is 0.02~0.025:1:0.009~0.012; the mass ratio of deionized water to Tris-HCl buffer solution is: 8.3:1; the mass ratio of dopamine hydrochloride to deionized water is 0.001~0.003:1; Step 6: Use a single-sided electrostatic spraying method to evenly spray the PDA@SiC dispersion onto the other side of the cotton fabric, and after drying, obtain a cotton fabric that is hydrophobic on one side and hydrophilic on the other side and has an automatic pump-type dye filtering and directional transportation function.

2. The method for preparing the automatic pump type directional transport cotton fabric for dye filtration according to claim 1, characterized in that: After step 6, the following steps are also included: The polydimethylsiloxane / curing agent is dissolved in the n-hexane solution and mixed evenly, and then the mixed solution is sprayed on the other side of the cotton fabric by electrostatic spraying, and then dried at a temperature of 70-90° C. for 4-5 hours; wherein the mass ratio of PDMS, curing agent and n-hexane solution is 9-11:0.9-1.1:650-750.

3. The method for preparing the automatic pump type directional transport cotton fabric for dye filtration according to claim 1, characterized in that: The concentration of the Tris-HCl buffer solution in step 3 and step 5 is 48-52 mmol / L, and the pH is 8-8.

5.

4. The method for preparing the automatic pump type directional transport cotton fabric for dye filtration according to claim 1, characterized in that: The spray volume of the PDA@CA-CD dispersion on each square decimeter of cotton fabric is 8~28mL.

5. The method for preparing the automatic pump type directional transport cotton fabric for dye filtration according to claim 1, characterized in that: The spray volume of the PDA@SiC dispersion on each square decimeter of cotton fabric is 8~32mL.

6. The method for preparing the automatic pump type directional transport cotton fabric for dye filtration according to claim 1, characterized in that: The process parameters of the single-sided electrostatic spraying method in step 4 and step 6 are: spinning voltage is 10-15V, receiving distance is 5-6cm, spinning rate is 0.1-0.15mL / min; needle diameter is 10mm, round-trip distance is 120mm, and moving speed is 10mm / s.

7. The method for preparing the automatic pump type directional transport cotton fabric for dye filtration according to claim 2, characterized in that: The spraying volume of the mixed solution on each square decimeter of cotton fabric is 8-24 mL.

8. The method for preparing the automatic pump type directional transport cotton fabric for dye filtration according to claim 2, characterized in that: The static contact angle of the hydrophobic side of the cotton fabric to water is 135-150°.

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