A method for preparing a self-pumping dye-filtering directional transport cotton fabric

Abstract

The application discloses a preparation method of a cotton fabric with automatic pump type dye filtering directional transportation, and comprises the following steps: synthesizing a CA-CD compound insoluble in water through an esterification reaction, and reacting the CA-CD compound with dopamine hydrochloride to obtain a PDA@CA-CD dispersion liquid, and spraying the dispersion liquid on one side of the cotton fabric to make the one side hydrophilic; then, reacting SiC with dopamine hydrochloride to obtain a PDA@SiC dispersion liquid, and spraying the dispersion liquid on the other side of the cotton fabric to obtain the cotton fabric with one side hydrophilic and the other side hydrophobic; the cotton fabric has the directional transportation function, the directional transportation process has no energy loss, the automatic pump type active transmission can be carried out for dye filtering, and the dye filtering speed is improved.

Description

Technical Field

[0001] This invention belongs to the field of functional textile technology, specifically relating to a method for preparing an directional transport cotton fabric for automatic pump-type dye filtration. Background Technology

[0002] In recent years, with the increasing emphasis placed on environmental protection by the state, water quality has become a major concern. Dye wastewater, a significant source of water pollution, has brought about numerous ecological and environmental problems. Therefore, researchers have invested considerable human, material, and financial resources in developing adsorption and filtration materials for dye wastewater. Currently, commonly used adsorption materials include adsorption resins, activated carbon, and bio-based adsorption materials. However, these materials suffer from low reusability and complex elution processes. Commonly used filtration membranes include hydrophilic polyethersulfone microporous membranes, PVDF membranes, and reverse osmosis membranes. However, the filtration process of these membranes primarily relies on the gravity of the liquid itself. Therefore, when the membrane pore size is small or the pollutant particle size is large, the filtration rate decreases significantly, sometimes requiring additional suction devices, which greatly limits the application of filter media. Summary of the Invention

[0003] To address the aforementioned problems in the prior art, this invention provides a method for preparing directional transport cotton fabric for automatic pump-type dye filtration.

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

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

[0006] Step 1: Weigh out β-cyclodextrin, citric acid and potassium dihydrogen phosphate according to the ratio and add them to deionized water in sequence, so that they are 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: React the above mixed solution at 140℃±5 for 4.5~5.5h to obtain a water-insoluble CA-CD crosslinked polymer;

[0008] Step 3: The CA-CD crosslinked polymer is dispersed in a Tris-HCl buffer solution and stirred to form a dispersion. Dopamine hydrochloride is added to the dispersion, and the mixture is stirred at room temperature for 7-10 hours to obtain a PDA@CA-CD dispersion. The mass ratio of the CA-CD crosslinked polymer to the Tris-HCl buffer solution is 0.045-0.058:1, and the mass ratio of the Tris-HCl buffer solution to the dopamine hydrochloride is 1:0.002-0.0025.

[0009] Step 4: The PDA@CA-CD dispersion is uniformly sprayed onto one side of the cotton fabric using a single-sided electrostatic spraying method. After drying, a PDA@CA-CD single-sided hydrophilic cotton fabric is obtained.

[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: The PDA@SiC dispersion is uniformly sprayed onto the other side of the cotton fabric using a single-sided electrostatic spraying method. After drying, a cotton fabric with one hydrophobic side and one hydrophilic side, and an automatic pump-type dye filtration and directional transport function is obtained.

[0012] Furthermore, step 6 is followed by:

[0013] The polydimethylsiloxane / curing agent is dissolved in a hexane solution and mixed evenly. Then, the mixture is sprayed onto the other side of the cotton fabric using an electrostatic spraying method, and then dried at a temperature of 70~90℃ for 4~5 hours. The mass ratio of PDMS, curing agent and hexane solution is 9~11:0.9~1.1:650~750.

[0014] Furthermore, the concentration of the Tris-HCl buffer solution in steps 3 and 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 for the single-sided electrostatic spraying method in steps 4 and 6 are as follows: 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 spray volume of the mixture on each square decimeter of cotton fabric is 8 to 24 mL.

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

[0020] The beneficial effects of this invention are:

[0021] 1. This invention utilizes the principle of asymmetric wetting to prepare cotton fabric with one side hydrophilic and the other side hydrophobic, which has a unidirectional moisture-wicking function. This enables the cotton fabric to have a directional transport function. The directional transport process has no energy loss and can be automatically pumped for active transfer to filter dyes, thereby improving the dye filtration speed. It can be widely promoted and applied.

[0022] 2. In order to improve the removal rate of dye, a CA-CD crosslinking product that can form a host-guest coating effect with the dye and is insoluble in water is added.

[0023] 3. This invention introduces mussel-like adhesion behavior, utilizing the self-adhesion behavior of polydopamine to effectively bond the hydrophilic and hydrophobic functional layer with the cotton fabric matrix.

[0024] 4. The cotton fabric prepared by this invention has good mechanical properties, stability and reusability. Attached Figure Description

[0025] Figure 1 Infrared spectra of CA-CD crosslinked polymer and β-cyclodextrin;

[0026] Figure 2(a) shows a water droplet pattern on the hydrophobic layer of the cotton fabric;

[0027] Figure 2(b) shows a water droplet pattern on the hydrophilic layer of the cotton fabric;

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

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

[0030] Figure 4 A diagram showing the static contact angle measurement on the hydrophobic side of cotton fabric;

[0031] Figure 5 This is a diagram showing the desorption-adsorption cycle results of the cotton fabric of the present invention. Detailed Implementation

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

[0033] Example 1

[0034] This invention discloses a method for preparing directional transport cotton fabric for automatic pump-type dye filtration, specifically including the following steps:

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

[0036] Step 2: Pour the above mixed solution into a polytetrafluoroethylene evaporating dish and place it in a forced-air drying oven. React at 135°C for 5.5 hours to obtain a water-insoluble CA-CD crosslinked polymer. Finally, wash the crosslinked 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, weigh 2.32g of CA-CD crosslinked polymer and disperse it in 40mL of Tris-HCl buffer solution with a concentration of 50mmol / L and pH of 8.5 to form a dispersion. Add 0.1g of dopamine hydrochloride to the dispersion and stir at room temperature for 10h to obtain PDA@CA-CD dispersion.

[0038] Step 4: At room temperature and humidity of 40%-50%, 28 mL of PDA@CA-CD dispersion is uniformly sprayed onto one side of a 1 dm × 1 dm cotton fabric using a single-sided electrostatic spraying method. After drying at 40℃, a PDA@CA-CD single-sided hydrophilic cotton fabric is obtained. The process parameters for the single-sided electrostatic spraying method are: 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 2.5g of nano-SiC and disperse it in 100mL of deionized water, and add 1.2g of sodium hexametaphosphate dispersant. Disperse the mixture for 1h using an ultrasonic oscillator to form a dispersion. Add 12mL of 50mmol / L Tris-HCl buffer solution to the dispersion. Then add 0.3g of dopamine hydrochloride to the dispersion and stir magnetically for 1h to obtain a black PDA@SiC dispersion.

[0040] Step 6: At room temperature and humidity of 40%-50%, 32 mL of PDA@SiC dispersion is uniformly sprayed onto the other side of a 1 dm × 1 dm cotton fabric using a single-sided electrostatic spraying method. After drying at 40℃, a cotton fabric with a certain roughness and an automatic pump-type dye filtration and directional transport function is obtained. One side of the cotton fabric is hydrophobic and the other side is hydrophilic. The process parameters of the single-sided electrostatic spraying method are: 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 using electrostatic spraying and mix evenly. Then, use electrostatic spraying to evenly spray 24mL of the mixture onto the other side of a 1dm×1dm cotton fabric, i.e., the same side as the sprayed surface in Step 6. Then, dry at 70℃ for 5h to enhance the hydrophobicity of the SiC-loaded side of the cotton fabric. 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] The polydimethylsiloxane and curing agent are both Dow Corning DC184.

[0043] Example 2

[0044] This invention discloses a method for preparing directional transport cotton fabric for automatic pump-type dye filtration, specifically including the following steps:

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

[0046] Step 2: Pour the above mixed solution into a polytetrafluoroethylene evaporating dish and place it in a forced-air drying oven. React at 145°C for 4.5 hours to obtain a water-insoluble CA-CD crosslinked polymer. Finally, wash the crosslinked 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, weigh 1.35g of CA-CD crosslinked polymer and disperse it in 30mL of Tris-HCl buffer solution with a concentration of 50mmol / L and a pH of 8.5 to form a dispersion. Add 0.06g of dopamine hydrochloride to the dispersion and stir at room temperature for 7h to obtain PDA@CA-CD dispersion.

[0048] Step 4: At room temperature and humidity of 40%-50%, 8 mL of PDA@CA-CD dispersion is uniformly sprayed onto one side of a 1 dm × 1 dm cotton fabric using a single-sided electrostatic spraying method. After drying at 40℃, a PDA@CA-CD single-sided hydrophilic cotton fabric is obtained. The process parameters for the single-sided electrostatic spraying method are: 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 1.6g of nano-SiC and disperse it in 80mL of deionized water, and add 0.72g of sodium hexametaphosphate dispersant. Disperse the mixture for 1h using an ultrasonic oscillator to form a dispersion. Add 9.6mL of 50mmol / L Tris-HCl buffer solution to the dispersion. Then add 0.08g of dopamine hydrochloride to the dispersion and stir magnetically for 1h to obtain a black PDA@SiC dispersion.

[0050] Step 6: At room temperature and humidity of 40%-50%, 8 mL of PDA@SiC dispersion is uniformly sprayed onto the other side of a 1 dm × 1 dm cotton fabric using a single-sided electrostatic spraying method. After drying at 40℃, a cotton fabric with a certain roughness and automatic pump-type dye filtration and directional transport function is obtained. One side of the cotton fabric is hydrophobic and the other side is hydrophilic. The process parameters of the single-sided electrostatic spraying method are: 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: Dissolve 10g of polydimethylsiloxane and 1g of curing agent in 650mL of n-hexane solution using electrostatic spraying and mix evenly. Then, use electrostatic spraying to evenly spray 8mL of the mixture onto the other side of a 1dm×1dm cotton fabric, i.e., the same side as the sprayed surface in Step 6. Then, dry at 90℃ for 4h to enhance the hydrophobicity of the SiC-loaded side of the cotton fabric. The process parameters for electrostatic spraying 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] The polydimethylsiloxane and curing agent are both Dow Corning DC184.

[0053] Example 3

[0054] This invention discloses a method for preparing directional transport cotton fabric for automatic pump-type dye filtration, specifically including the following steps:

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

[0056] Step 2: Pour the above mixed solution into a polytetrafluoroethylene evaporating dish and place it in a forced-air drying oven. React at 140°C for 5 hours to obtain a water-insoluble CA-CD crosslinked polymer. Finally, wash the crosslinked 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, weigh 1.75g ​​of CA-CD crosslinked polymer and disperse it in 35mL of Tris-HCl buffer solution with a concentration of 50mmol / L and pH of 8.5 to form a dispersion. Add 0.08g of dopamine hydrochloride to the dispersion and stir at room temperature for 8h to obtain PDA@CA-CD dispersion.

[0058] Step 4: At room temperature and humidity of 40%-50%, 18 mL of PDA@CA-CD dispersion is uniformly sprayed onto one side of a 1 dm × 1 dm cotton fabric using a single-sided electrostatic spraying method. After drying at 40℃, a PDA@CA-CD single-sided hydrophilic cotton fabric is obtained. The process parameters for the single-sided electrostatic spraying method are: 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 2.07g of nano-SiC and disperse it in 90mL of deionized water, and add 0.99g of sodium hexametaphosphate dispersant. Disperse the mixture for 1h using an ultrasonic oscillator to form a dispersion. Add 10.8mL of 50mmol / L Tris-HCl buffer solution to the dispersion. Then add 0.18g of dopamine hydrochloride to the dispersion and stir magnetically for 1h to obtain a black PDA@SiC dispersion.

[0060] Step 6: At room temperature and humidity of 40%-50%, 20 mL of PDA@SiC dispersion is uniformly sprayed onto the other side of a 1 dm × 1 dm cotton fabric using a single-sided electrostatic spraying method. After drying at 40℃, a cotton fabric with a certain roughness and automatic pump-type dye filtration and directional transport function is obtained. One side of the cotton fabric is hydrophobic and the other side is hydrophilic. The process parameters of the single-sided electrostatic spraying method are: 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 using electrostatic spraying and mix evenly. Then, use electrostatic spraying to evenly spray 16mL of the mixture onto the other side of a 1dm×1dm cotton fabric, i.e., the same side as the sprayed surface in Step 6. Then, dry at 80℃ for 4.5h to enhance the hydrophobicity of the SiC-loaded side of the cotton fabric. 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] The polydimethylsiloxane and curing agent are both Dow Corning DC184.

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

[0064] The chemical structure of the insoluble CA-CD crosslinked polymer was determined and analyzed using Fourier transform infrared spectroscopy (FTIR), such as... Figure 1 As shown, the infrared spectrum of CA-CD is compared with that of β-CD, at 3404 cm⁻¹. −1 It was confirmed to be the stretching vibration of the hydroxyl group, at 1721 cm⁻¹ −1 The absorption characteristic peak at the point corresponds to the stretching vibration of the carbon-oxygen double bond (C=O) of the carboxyl or ester group in the CA-CD crosslinked polymer, indicating that the esterification crosslinking reaction was successfully carried out, and CA-CD was successfully prepared by dehydration condensation reaction.

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

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

[0067] like Figure 4 As shown, the static contact angle of the hydrophobic side of the cotton fabric with water, measured using a contact angle measuring instrument, is between 136° and 137°. Furthermore, experimental verification shows that the optimal static contact angle for the hydrophobic side of the cotton fabric with water is between 135° and 150°. When the static contact angle is less than 135°, the directional transport function is weak, and the time required to filter the same volume of solution is longer; when the static contact angle is greater than 150°, the transport function cannot be achieved.

[0068] Furthermore, by comparing the filtration performance of a cotton fabric with hydrophilic sides and a cotton fabric prepared in this invention with one hydrophilic side and one hydrophobic side for methylene blue solution, the results are shown in Table 1. When filtering the same volume of methylene blue solution, the cotton fabric prepared in this invention requires less time to filter the same volume of methylene blue solution, and in the same amount of time, it filters a larger volume of solution.

[0069] Table 1. Parameters related to the filtration test Original fabric 4.2 90 0.408 Hydrophilic fabric on both sides 4.5 110 0.519 One-way moisture-wicking cloth (prepared according to this invention) 5.5 90 0.422

[0070] Furthermore, the cotton fabric prepared by this invention is reusable, such as... Figure 5 As shown, after 7 desorption-adsorption cycles, the adsorption efficiency still reached 92±1.0%.

[0071] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A method for preparing an directional transport cotton fabric for automatic pump-type dye filtration, characterized in that, include: Step 1: Weigh out β-cyclodextrin, citric acid and potassium dihydrogen phosphate according to the ratio and add them to deionized water in sequence, so that they are 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: React the above mixed solution at 140℃±5 for 4.5~5.5h to obtain a water-insoluble CA-CD crosslinked polymer; Step 3: The CA-CD crosslinked polymer is dispersed in a Tris-HCl buffer solution and stirred to form a dispersion. Dopamine hydrochloride is added to the dispersion, and the mixture is stirred at room temperature for 7-10 hours to obtain a PDA@CA-CD dispersion. The mass ratio of the CA-CD crosslinked polymer to the Tris-HCl buffer solution is 0.045-0.058:1, and the mass ratio of the Tris-HCl buffer solution to the dopamine hydrochloride is 1:0.002-0.0025. Step 4: The PDA@CA-CD dispersion is uniformly sprayed onto one side of the cotton fabric using a single-sided electrostatic spraying method. After drying, a PDA@CA-CD single-sided hydrophilic cotton fabric is obtained. 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 uniformly spray the PDA@SiC dispersion onto the other side of the cotton fabric; Polydimethylsiloxane / curing agent is dissolved in n-hexane solution and mixed evenly. Then, the mixture is sprayed onto the other side of the cotton fabric using electrostatic spraying. The fabric is then dried at 70~90℃ for 4~5 hours to obtain a cotton fabric with one hydrophobic side and one hydrophilic side, which has an automatic pump-type dye filtration and directional transport function. The mass ratio of PDMS, curing agent and n-hexane solution is 9~11:0.9~1.1:650~750.

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

5.

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

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

5. The method for preparing directional transport cotton fabric for automatic pump-type dye filtration according to claim 1, characterized in that, The process parameters for the single-sided electrostatic spraying method in steps 4 and 6 are as follows: 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.

6. The method for preparing directional transport cotton fabric for automatic pump-type dye filtration according to claim 1, characterized in that, The spray volume of the mixture on each square decimeter of cotton fabric is 8-24 mL.

7. The method for preparing directional transport cotton fabric for automatic pump-type dye filtration according to claim 1, characterized in that, The static contact angle of the hydrophobic side of the cotton fabric with water is 135~150°.

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