Preparation method of super-hydrophobic cotton cloth with self-cleaning and oil-water separation functions

Abstract

The application provides a preparation method of super-hydrophobic cotton cloth with self-cleaning and oil-water separation functions, and belongs to the technical field of functional materials. The preparation method is characterized by the following steps: modifying a commercial cotton cloth by using a silane surfactant to modify a mercapto group, in-situ grafting polybutadiene on the modified cotton cloth by using a photosensitizer in a n-hexane solution, and grafting hydrophobic particles to the cotton cloth by using a bis-mercapto compound. The super-hydrophobic cotton cloth prepared by the application has good super-hydrophobic performance and oil-water separation selectivity, and has a super-high continuous adsorption efficiency of oil in an oil-water mixture, which can reach 99.9%. The application has a simple process and is suitable for industrial production. The super-hydrophobic cotton cloth prepared by the application has high stability, can be recycled, and can be used for repairing water bodies such as marine oil spills and oil-containing industrial wastewater treatment.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of functional materials, and particularly relates to a preparation method of super-hydrophobic cotton cloth with self-cleaning and oil-water separation functions. BACKGROUND

[0002] With the continuous development of bionic technology, researchers have made super-hydrophobic materials with a contact angle greater than 150° and a rolling angle less than 10° by bionics from lotus leaves, petals, water striders and bird feathers, etc. Such materials have the advantages of self-cleaning, anti-icing, anti-fogging and anti-corrosion, and have important application prospects in green printing, sensors and oil-water separation, etc., and are highly concerned.

[0003] Two key elements of super-hydrophobic materials are a relatively low surface energy of the material surface and a microstructure with a certain roughness. On the basis of this theory, various methods for preparing super-hydrophobic surfaces have been developed, including plasma etching, phase separation, chemical vapor deposition, layer-by-layer self-assembly, solution immersion method and sol-gel method. The solution immersion method is widely used to prepare various super-hydrophobic material surfaces due to its high efficiency and simple operation in constructing micro / nano structures on the material surface.

[0004] In recent years, super-hydrophobic cotton cloth materials for oil-water separation have been widely studied. When an oil-water mixture passes through the super-hydrophobic cotton cloth, the water is repelled on one end and the oil can pass through, thereby realizing oil-water separation. However, in large-scale practical applications, there are still problems to be solved for super-hydrophobic materials, and simple, economical and environmentally friendly preparation methods need to be developed.

[0005] In the current reports, for example, Chinese patents CN103243545A and CN104294592A, fluorine-containing compounds are used to reduce the surface energy. Such fluorine-containing compounds are not only expensive, but also cause problems to human health and the environment. In addition, due to the particularity of the surface of super-hydrophobic materials, they are easily corroded in oil-water separation, which limits their application. Therefore, developing super-hydrophobic cotton cloth that is economical, simple, environmentally friendly and has good corrosion resistance is the only way to be applied in oil-water separation scenarios on a large scale. SUMMARY

[0006] In view of the deficiencies of the prior art, the application provides a preparation method of super-hydrophobic cotton cloth with self-cleaning and oil-water separation functions, which is simple in process and suitable for industrial production. The super-hydrophobic cotton cloth prepared by the method has high stability, good corrosion resistance and wear resistance, and can quickly separate oil-water mixtures.

[0007] The purpose of the application is achieved by the following technical solutions.

[0008] The preparation method of the super-hydrophobic cotton cloth with self-cleaning and oil-water separation functions comprises the following steps:

[0009] S1, modification of the cotton cloth

[0010] The cotton cloth treated with alkali is soaked in a mixed solution of ethanol and water to obtain a mixed solution A; a surfactant silane is weighed and dissolved in ethanol to obtain a solution B; the mixed solution A and the solution B are uniformly mixed to obtain a mixed solution C; the reaction is carried out in a water bath at 40-70°C for 4-8h; after the reaction is completed, the cotton cloth is washed with ethanol for 3-6 times and dried to obtain a modified cotton cloth.

[0011] S2, preparation of the super-hydrophobic cotton cloth

[0012] The modified cotton cloth is soaked in a n-hexane solution to obtain a solution C; a polymer is weighed and dissolved in n-hexane to obtain a solution D; the solution C and the solution D are uniformly mixed to obtain a mixed solution E; the mixed solution E is stirred in a water bath at 40-70°C for 4-8h, then a photoinitiator is added and stirred to obtain a mixed solution F; hydrophobic particles are weighed and dispersed in n-hexane to obtain a mixed solution G; the mixed solution F and the mixed solution G are uniformly mixed, then a bimerthiol compound is added, and the mixture is stirred in a water bath at 40-70°C for 1-2h; then the cotton cloth is washed with n-hexane for 3-6 times, irradiated with a UV lamp for 15-25min, and dried; after the drying is completed, the super-hydrophobic cotton cloth is obtained.

[0013] Preferably, in step S1, the alkali treatment of the cotton cloth is that the cotton cloth is soaked in a 2-6wt% sodium hydroxide aqueous solution for 20-60min, then washed with deionized water until neutral, and dried.

[0014] Preferably, in step S1, the surfactant silane is one or more of 3-mercaptopropyl triethoxysilane, mercaptopropyl trimethoxysilane, and 3-(methacryloyloxy)propyl trimethoxysilane.

[0015] Preferably, in step S1, the mass ratio of ethanol to water in the mixed solution of ethanol and water is 4:(1-0.5); and in the solution B, the mass ratio of the surfactant silane to ethanol is 1:(4-12).

[0016] Preferably, in step S2, in the solution D, the mass ratio of the polymer to n-hexane is 1:(12-25); the polymer is one of unsaturated polybutadiene rubber, butadiene styrene copolymer, and polybutadiene polymer, and has a number average molecular weight of 1000-300000.

[0017] Preferably, in step S2, the photoinitiator is benzoin and derivatives, including one or more of benzoin, benzoin dimethyl ether, benzoin ethyl ether, benzoin isopropyl ether, or benzoin butyl ether, and has a mass ratio to the polymer of 1:(100-2500).

[0018] Preferably, in step S2, the mass ratio of hydrophobic particles to n-hexane in the mixed solution G is 1:(10-50), and the mass ratio of hydrophobic particles to polymer is (1-15):1. The hydrophobic particles are one or more of vinyl-polysilsesquioxane, methacryloyloxypropyl cage polysilsesquioxane, and hydrophobic nano-silicon dioxide disclosed in patent CN113929104A.

[0019] Preferably, in step S2, the mass ratio of the bimer capto compound to the polymer is 1:(10-100). The bimer capto compound includes a molecule containing two thiol groups in the molecular chain, such as one or more of ethylene glycol bimer capto acetate, 1,6-hexanedithiol, 3,4-hexanedithiol, propanedithiol, 2,3-propanedithiol, and 2,3-pentanedithiol.

[0020] Preferably, in step S2, the wavelength of the ultraviolet lamp is 365 nm, and the intensity is 300 mW / cm 2 , and the irradiation is performed at a distance of 15-20 cm from the cotton cloth.

[0021] Preferably, in steps S1 and S2, the drying is vacuum oven drying, the temperature is 70-100°C, and the time is 2-4 h.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] (1) The present application modifies the cotton cloth, and then uses the room temperature rapid reaction of the thiol-ene click reaction to fix the polymer containing unsaturated double bonds such as polybutadiene and hydrophobic particles on the surface of the cotton cloth, to obtain super-hydrophobic cotton cloth with self-cleaning and oil-water separation functions. Specifically, the hydroxyl groups on the surface of the cotton cloth undergo condensation reaction with the surfactant silane, and then chemical linkage is established with the polymer containing unsaturated double bonds such as polybutadiene. By introducing hydrophobic particles on the surface, the micro-nano structure of the cotton cloth surface is controlled, and the self-cleaning and oil-water separation functions of the cotton cloth are realized. The method is simple and can be implemented on a large scale.

[0024] (2) The modified cotton cloth has a polymer layer on the surface, which has affinity for most oil solvents and repulsion for water, so it can quickly absorb oil solvents, including n-hexane, toluene, chloroalkane, petroleum ether, etc. oil solution, and can be recycled multiple times, and can quickly separate oil solvents on the water surface, sea surface, etc., with fast separation speed and good separation effect.

[0025] (3) The super-hydrophobic cotton cloth prepared by the present application has good self-cleaning property, and the water contact angle in air can reach 157°, and no expensive and fluorine-containing compounds are used to reduce the surface energy. The present application uses commonly used polybutadiene unsaturated polymer to reduce the surface energy, which plays an important role in reducing the cost of the whole process. Attached Figure Description

[0026] Figure 1 Drip water (stained with methylene blue), orange juice, and milk onto untreated cotton cloth;

[0027] Figure 2 A schematic diagram of oil-water separation in superhydrophobic cotton fabric;

[0028] Figure 3 Figures showing the state of water droplets (stained with methylene blue), orange juice, and milk droplets on the cotton fabric prepared in Example 1;

[0029] Figure 4 Low-magnification scanning electron microscope image of untreated cotton fabric;

[0030] Figure 5 High-magnification scanning electron microscope image of untreated cotton fabric;

[0031] Figure 6 This is a low-magnification scanning electron microscope image of the superhydrophobic cotton fabric prepared in Example 1;

[0032] Figure 7 This is a high-magnification scanning electron microscope image of the superhydrophobic cotton fabric prepared in Example 1;

[0033] Figure 8 Photographs showing the contact angles of the superhydrophobic cotton fabrics prepared in each embodiment. Detailed Implementation

[0034] The specific embodiments of the present invention will be further described below with reference to examples.

[0035] The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and should not be used to limit the scope of protection of the present invention. The processes, conditions, reagents, experimental methods, and testing methods for implementing the present invention, except for those specifically mentioned below, are all common knowledge and general knowledge in the field, and the present invention does not have any particular limitations.

[0036] To test the application effect of the prepared superhydrophobic cotton cloth, the prepared superhydrophobic cotton cloth was fixed on an oil-water separation device. 20g of deionized water and 20g of petroleum ether were mixed and then separated. The separation efficiency of the oil-water mixture was obtained by mass calculation.

[0037] The UV lamp irradiation conditions used in the embodiments were uniformly set as follows: UV lamp wavelength of 365nm and intensity of 300mW / cm². 2 Irradiate at a distance of 15cm from the cotton cloth.

[0038] Example 1

[0039] The preparation of the super-hydrophobic cotton cloth with self-cleaning and oil-water separation functions comprises the following steps:

[0040] S1, modification of cotton cloth

[0041] 2.5 g of cotton cloth is soaked in a 2 wt% sodium hydroxide solution for 20 min, then washed to neutral with deionized water, and dried. Then the cotton cloth is soaked in a mixture of 100 g of ethanol and water to obtain a mixture A; 8.5 g of 3-mercaptopropyl triethoxysilane is dissolved in 100 g of ethanol to obtain a solution B; the mixture A and the solution B are mixed uniformly to obtain a mixture C; the reaction is carried out in a 40℃ water bath for 8 h; after the reaction is completed, the cotton cloth is washed with ethanol for 3 times, and then dried in a 90℃ vacuum oven for 4 h to obtain a modified cotton cloth.

[0042] In the mixture of ethanol and water, the mass ratio of ethanol to water is 4:1.

[0043] S2, preparation of super-hydrophobic cotton cloth

[0044] The modified cotton cloth is soaked in 100 g of n-hexane solution to obtain a solution C; 2 g of polybutadiene polymer with a number average molecular weight of 2000 is dissolved in 24 g of n-hexane to obtain a solution D; the solution C and the solution D are mixed uniformly to obtain a mixture E; the mixture E is stirred in a 40℃ water bath for 8 h, and then 0.02 g of benzoin dimethyl ether is added and stirred to obtain a mixture F; 2 g of vinyl-poly silesquioxane is dispersed in 20 g of n-hexane to obtain a mixture G; the mixture F and the mixture G are mixed uniformly, and then 0.2 g of 1,6-hexanedithiol is added; the mixture is stirred in a 40℃ water bath for 2 h; then the cotton cloth is washed with n-hexane for 3 times, irradiated with a UV lamp for 15 min, and then dried in a 70℃ vacuum oven for 4 h to obtain a super-hydrophobic cotton cloth.

[0045] As shown in Figure 8 , the super-hydrophobic cotton cloth prepared in this embodiment has a contact angle of 157°.

[0046] The super-hydrophobic cotton cloth prepared in this embodiment can be used for oil-water separation, and the oil-water separation efficiency is 99.98%; after 20 times of oil-water separation, the oil-water separation efficiency is 99.94%; and after 50 times of oil-water separation, the oil-water separation efficiency is 99.92%.

[0047] The cotton cloth prepared in this embodiment is compared with untreated cotton cloth:

[0048] The state diagrams of water droplets (methylene blue dyed), orange juice, and milk droplets on untreated cotton cloth are as shown in Figure 1 , and the schematic diagram of oil-water separation of the super-hydrophobic cotton cloth is as shown in Figure 2 ; and the state diagrams of water droplets (methylene blue dyed), orange juice, and milk droplets on the cotton cloth prepared in Example 1 are as shown in Figure 3 .

[0049] Low magnification scanning electron micrograph of untreated cotton cloth and high magnification scanning electron micrograph of untreated cotton cloth, as shown in Figures 4-5 Low magnification scanning electron micrograph of super-hydrophobic cotton cloth prepared in Example 1 and high magnification scanning electron micrograph of super-hydrophobic cotton cloth prepared in Example 1, as shown in Figures 6-7 .

[0050] Example 2

[0051] Preparation of the super-hydrophobic cotton cloth with self-cleaning and oil-water separation functions, the preparation method comprising the following steps:

[0052] S1, cotton cloth modification

[0053] 2.5 g of cotton cloth was soaked in a 6 wt% sodium hydroxide solution for 60 min, then washed to neutral with deionized water and dried. Then the cotton cloth was soaked in a mixture of 100 g of ethanol and water to obtain a mixture A; 20 g of 3-mercaptopropyl triethoxysilane was dissolved in 100 g of ethanol to obtain a solution B; the mixture A and the solution B were mixed uniformly to obtain a mixture C; the mixture C was reacted in a 60℃ water bath for 4 h, after the reaction was completed, the cotton cloth was washed with ethanol for 3 times and dried in a 90℃ vacuum oven for 4 h to obtain a modified cotton cloth.

[0054] In the mixture of ethanol and water, the mass ratio of ethanol to water is 4:0.5;

[0055] S2, preparation of super-hydrophobic cotton cloth

[0056] The modified cotton cloth was soaked in 100 g of n-hexane solution to obtain a solution C; 2 g of polybutadiene polymer with a number average molecular weight of 4000 was dissolved in 50 g of n-hexane to obtain a solution D, the solution C and the solution D were mixed uniformly to obtain a mixture E; the mixture E was stirred in a 60℃ water bath for 4 h, then 0.0008 g of benzoin ethyl ether was added and stirred to obtain a mixture F; 20 g of methacryloyloxypropyl cage polysilsesquioxane was dispersed in 300 g of n-hexane to obtain a mixture G, the mixture F and the mixture G were mixed uniformly, then 0.02 g of propanedithiol was added, and the mixture was stirred in a 60℃ water bath for 1 h, then the cotton cloth was washed with n-hexane for 3 times, irradiated with a UV lamp for 20 min, and then dried in a 90℃ vacuum oven for 2 h to obtain a super-hydrophobic cotton cloth.

[0057] As shown in Figure 8 The super-hydrophobic cotton cloth prepared in the present embodiment has a contact angle of 155°.

[0058] The super-hydrophobic cotton cloth prepared in the embodiment can be used for oil-water separation, and the oil-water separation efficiency is 99.95%; after 20 times of oil-water separation, the oil-water separation efficiency is 99.94%; and after 50 times of oil-water separation, the oil-water separation efficiency is 99.93%.

[0059] Embodiment 3

[0060] The preparation of the super-hydrophobic cotton cloth with self-cleaning and oil-water separation functions comprises the following steps:

[0061] S1, modification of cotton cloth

[0062] 2.5 g of cotton cloth was soaked in a 4 wt% sodium hydroxide solution for 30 min, then washed to neutral with deionized water, and dried. Then the cotton cloth was soaked in a mixture of 100 g of ethanol and water to obtain a mixture A; 10 g of mercaptopropyltrimethoxysilane was dissolved in 100 g of ethanol to obtain a solution B; the mixture A and the solution B were mixed uniformly to obtain a mixture C; the mixture C was reacted in a 60℃ water bath for 4 h; after the reaction was completed, the cotton cloth was washed with ethanol for 3 times, and then dried in a 90℃ vacuum oven for 4 h to obtain a modified cotton cloth.

[0063] In the mixture of ethanol and water, the mass ratio of ethanol to water is 4:1.

[0064] S2, preparation of super-hydrophobic cotton cloth

[0065] The modified cotton cloth was soaked in 100 g of n-hexane solution to obtain a solution C; 2 g of polybutadiene polymer with a number average molecular weight of 10000 was dissolved in 45 g of n-hexane to obtain a solution D; the solution C and the solution D were mixed uniformly to obtain a mixture E; the mixture E was stirred in a 60℃ water bath for 4 h, and then 0.002 g of benzoin butyl ether was added and stirred to obtain a mixture F; 10 g of hydrophobic nano-silicon dioxide disclosed in embodiment 1 of the patent CN113929104A was dispersed in 100 g of n-hexane to obtain a mixture G; the mixture F and the mixture G were mixed uniformly, and then 0.04 g of 2,3-pentanedithiol was added; the mixture was stirred in a 60℃ water bath for 2 h; then the cotton cloth was washed with n-hexane for 3 times, irradiated with a UV lamp for 15 min, and then dried in an 80℃ vacuum oven for 3 h to obtain a super-hydrophobic cotton cloth.

[0066] As shown in the embodiment, the super-hydrophobic cotton cloth prepared in the embodiment has a contact angle of 156°. Figure 8

[0067] The super-hydrophobic cotton cloth prepared in the embodiment can be used for oil-water separation, and the oil-water separation efficiency is 99.96%; after 20 times of oil-water separation, the oil-water separation efficiency is 99.96%; and after 50 times of oil-water separation, the oil-water separation efficiency is 99.94%.

[0068] Embodiment 4​

[0069] The preparation of the super-hydrophobic cotton cloth with self-cleaning and oil-water separation functions comprises the following steps:

[0070] S1, modification of cotton cloth

[0071] 2.5 g of cotton cloth was soaked in a 4 wt% sodium hydroxide solution for 30 min, then washed to neutral with deionized water and dried. Then the cotton cloth was soaked in a mixture of 100 g of ethanol and water to obtain a mixture A; 5 g of mercaptopropyl trimethoxysilane and 5 g of 3-(methacryloyloxy)propyl trimethoxysilane were dissolved in 100 g of ethanol to obtain a solution B; the mixture A and the solution B were mixed uniformly to obtain a mixture C; the reaction was carried out in a 60°C water bath for 4 h, after the completion of the reaction, the cotton cloth was washed with ethanol for 3 times and dried in a 90°C vacuum oven for 4 h to obtain a modified cotton cloth.

[0072] In the mixture of ethanol and water, the mass ratio of ethanol to water is 4:1;

[0073] S2, preparation of super-hydrophobic cotton cloth

[0074] The modified cotton cloth was soaked in 100 g of n-hexane solution to obtain a solution C; 2 g of polybutadiene polymer with a number average molecular weight of 300000 was dissolved in 45 g of n-hexane to obtain a solution D, the solution C and the solution D were mixed uniformly to obtain a mixture E; the mixture was stirred in a 60°C water bath for 4 h, then 0.002 g of benzoin butyl ether was added and stirred to obtain a mixture F; 4 g of vinyl-poly silesquioxane was dispersed in 80 g of n-hexane to obtain a mixture G, the mixture F and the mixture G were mixed uniformly, then 0.08 g of ethylene glycol dimercaptoacetate was added, and the mixture was stirred in a 60°C water bath for 1.5 h, then the cotton cloth was washed with n-hexane for 3 times, irradiated with a UV lamp for 25 min, and then dried in a 90°C vacuum oven for 4 h to obtain a super-hydrophobic cotton cloth.

[0075] As shown in Figure 8 The contact angle of the super-hydrophobic cotton cloth prepared in this embodiment is 154°.

[0076] The super-hydrophobic cotton cloth prepared in this embodiment can be used for oil-water separation, and the oil-water separation efficiency is 99.94%; after 20 times of oil-water separation, the oil-water separation efficiency is 99.92%; after 50 times of oil-water separation, the oil-water separation efficiency is 99.90%.

[0077] Example 5

[0078] The preparation of the super-hydrophobic cotton cloth with self-cleaning and oil-water separation functions comprises the following steps:

[0079] S1, modification of cotton cloth

[0080] 2.5 g of cotton cloth was soaked in 4 wt% sodium hydroxide solution for 40 min, then washed to neutral with deionized water and dried. The cotton cloth was then soaked in a mixture of 100 g of ethanol and water to obtain mixture A; 13.8 g of 3-mercaptopropyltriethoxysilane was dissolved in 100 g of ethanol to obtain solution B; mixture A and solution B were mixed uniformly to obtain mixture C; the reaction was carried out in a 50℃ water bath for 6 h, after the reaction was completed, the cotton cloth was rinsed with ethanol for 3 times and dried in a 90℃ vacuum oven for 4 h to obtain the modified cotton cloth.

[0081] In the mixture of ethanol and water, the mass ratio of ethanol to water is 4:1;

[0082] S2, Preparation of super-hydrophobic cotton cloth

[0083] The modified cotton cloth was soaked in 100 g of n-hexane solution to obtain solution C; 2 g of butadiene-styrene rubber polymer with a number average molecular weight of 15000 was dissolved in 24 g of n-hexane to obtain solution D, and solution C and solution D were mixed uniformly to obtain mixture E; stirring was carried out in a 50℃ water bath for 6 h, then 0.02 g of benzoin was added and stirred to obtain mixture F; 4 g of vinyl-poly silesquioxane was dispersed in 60 g of n-hexane to obtain mixture G, and mixture F and mixture G were mixed uniformly, then 0.1 g of 1,6-hexanedithiol was added, stirring was carried out in a 50℃ water bath for 1 h, then the cotton cloth was rinsed with n-hexane for 3 times, irradiated with a UV lamp for 20 min, and then dried in a 90℃ vacuum oven for 4 h to obtain the super-hydrophobic cotton cloth.

[0084] As shown in Figure 8 The super-hydrophobic cotton cloth prepared in this embodiment has a contact angle of 153°.

[0085] The super-hydrophobic cotton cloth prepared in this embodiment can be used for oil-water separation, and the oil-water separation efficiency is 99.93%; after 20 times of oil-water separation, the oil-water separation efficiency is 99.92%; and after 50 times of oil-water separation, the oil-water separation efficiency is 99.90%.

Claims

1. A method for preparing a super-hydrophobic cotton cloth having self-cleaning and oil-water separation functions, characterized by: The method comprises the following steps: S1, modification of cotton cloth The alkali-treated cotton cloth is soaked in a mixture of ethanol and water to obtain a mixture A; a surfactant silane is weighed and dissolved in ethanol to obtain a solution B; the mixture A and the solution B are mixed uniformly to obtain a mixture C; the reaction is carried out in a water bath at 40-70℃ for 4-8h; after the reaction is completed, the cotton cloth is washed with ethanol and dried to obtain the modified cotton cloth; the surfactant silane is one or more of 3-mercaptopropyl triethoxysilane, mercaptopropyl trimethoxysilane and 3-(methacryloyloxy)propyl trimethoxysilane. S2, preparation of super-hydrophobic cotton cloth The modified cotton cloth is soaked in a n-hexane solution to obtain a solution C; a polymer is weighed and dissolved in n-hexane to obtain a solution D; the solution C and the solution D are mixed uniformly to obtain a mixture E; the mixture E is stirred in a water bath at 40-70℃ for 4-8h, then a photoinitiator is added and stirred to obtain a mixture F; hydrophobic particles are weighed and dispersed in n-hexane to obtain a mixture G; the mixture F and the mixture G are mixed uniformly, then a bismercapto compound is added, and the mixture is stirred in a water bath at 40-70℃ for 1-2h; then the cotton cloth is washed with n-hexane, irradiated with a UV lamp for 15-25min, and dried; after the drying is completed, the super-hydrophobic cotton cloth is obtained. The polymer is an unsaturated polybutadiene rubber with a number average molecular weight of 1000-300000; the mass ratio of the hydrophobic particles to the polymer is (1-15):1; the hydrophobic particles are one or both of vinyl-polyhedral silsesquioxane and methacryloyloxy propyl cage-shaped polysilsesquioxane; the mass ratio of the bismercapto compound to the polymer is 1:(10-100); the bismercapto compound includes one or more of bismercapto ethylene glycol, 1,6-hexanedithiol, 3,4-hexanedithiol, propanedithiol, 2,3-propanedithiol and 2,3-pentanedithiol.

2. The method for preparing the super-hydrophobic cotton cloth with self-cleaning and oil-water separation functions according to claim 1, characterized in that: In step S1, the alkali treatment of the cotton cloth is that the cotton cloth is soaked in a 2-6wt% sodium hydroxide aqueous solution for 20-60min, then washed with deionized water until neutral, and dried.

3. The method of claim 1, wherein the method further comprises: coating the surface of the cotton fabric with a solution of a hydrophobic material; and drying the cotton fabric. In step S1, the mass ratio of ethanol to water in the mixture of ethanol and water is 4:(1-0.5); in the solution B, the mass ratio of the surfactant silane to ethanol is 1:(4-12).

4. The method of claim 1, wherein the method further comprises: coating the surface of the cotton fabric with a solution of a hydrophobic material; and drying the cotton fabric. In step S2, in the solution D, the polymer is one of butadiene styrene copolymer and polybutadiene polymer.

5. The method of claim 1, wherein the method further comprises: coating the surface of the cotton fabric with a mixture of a hydrophobic material and a hydrophilic material. In step S2, the photoinitiator includes one or more of benzoin, benzoin dimethyl ether, benzoin ethyl ether, benzoin isopropyl ether or benzoin butyl ether, and the mass ratio of the photoinitiator to the polymer is 1:(100-2500).

6. The method of claim 1, wherein the method further comprises: coating the surface of the cotton fabric with a solution of a hydrophobic material; and drying the cotton fabric. In step S2, in the mixture G, the mass ratio of the hydrophobic particles to n-hexane is 1:(10-50).

7. The method of claim 1, wherein the method further comprises: coating the surface of the cotton fabric with a solution of a hydrophobic polymer and a surfactant; and drying the cotton fabric. In step S2, the UV lamp wavelength is 365 nm, and the intensity is 300 mW / cm 2 , and the irradiation is performed at a distance of 15 to 20 cm from the cotton fabric.

8. The method of claim 1, wherein the method further comprises: coating the surface of the cotton fabric with a solution of a hydrophobic material; and drying the cotton fabric. In steps S1 and S2, the drying is vacuum oven drying, the temperature is 70-100℃, and the time is 2-4h.

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