A super-hydrophobic cotton fabric and a method for preparing the same

Abstract

The application relates to a super-hydrophobic cotton fabric and a preparation method thereof. The fabric can be prepared by the following method: firstly, a pore-forming agent and polystyrene are dissolved in dimethylformamide to prepare a spinning solution; secondly, the cotton fabric is pretreated; thirdly, the spinning is performed by using an electrostatic spinning technology; and finally, the super-hydrophobic cotton fabric is prepared by washing under the assistance of ultrasonic waves. The super-hydrophobic cotton fabric prepared by the application contains the hydrophobic material polystyrene on the surface, the apparent contact angle of water drops on the surface of the cotton fabric ranges between 151 DEG and 154 DEG, the super-hydrophobic property is very good, the hydrophobic property of the cotton fabric is not obviously weakened after 10 times of washing, and this indicates that the hydrophobic material polystyrene can be firmly attached to the surface of the cotton fabric.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fabric preparation, and particularly relates to a super-hydrophobic cotton fabric and a preparation method thereof. BACKGROUND

[0002] Pollutants and dust in the air and other harmful substances can cause harm to the human body. Moreover, clothes worn by people can also adsorb harmful substances in outdoor air and bring them into indoor air, thereby affecting the air quality in the house and further endangering human health. Therefore, one of the future research directions is to endow the fabric used to make the body of a traditional garment with super-hydrophobic properties.

[0003] Cotton fabric is widely used in daily life due to its unique softness, air permeability, warmth, comfort and biodegradability. In recent years, more and more researchers have shown interest in endowing the fabric with self-cleaning, antibacterial, anti-pollution, water-oil separation and other functions by modifying the surface of the fabric to be hydrophobic.

[0004] According to literature research, the super-hydrophobic properties of cotton fabric have attracted widespread attention in recent years. For example, Chinese patent application No. 202110254424.0 discloses a super-hydrophobic cotton material with photo-thermal effect and a preparation method and application thereof: first, multi-hydroxyl carbon nanotubes (CNT) are modified to be super-hydrophobic, long-chain hydrophobic groups are obtained through hydrolysis and condensation reactions between TEOS and HDTMS loaded on the CNT, and the super-hydrophobic nanoparticles are obtained by drying; then, the super-hydrophobic cotton material with photo-thermal effect is obtained by adhering the super-hydrophobic nanoparticles to the cotton material using the excellent adhesion of PDMS; Chinese patent application No. 202011401947.5 discloses a preparation method of flexible hydrophobic cotton fabric and flexible hydrophobic cotton: the cotton fabric is sequentially immersed in a copper ion salt solution and a gallic acid solution to form a GA-Cu(II) complex modification layer on the surface of the cotton fabric; under alkaline conditions, the GA-Cu(II) complex modification layer is reacted with molecules containing amine, sulfur or alcohol to generate long-chain hydrocarbon substances through Michael addition or Schiff base reaction to obtain hydrophobic properties; the cotton fabric with hydrophobic properties is softened by emulsified amino silicone oil. The super-hydrophobic cotton fabric prepared by the above method still has some problems: most of the methods for preparing super-hydrophobic cotton fabric are time-consuming and complicated to operate, and most of the manufacturing methods involve the use of polluting compounds, which can easily cause pollution and are high in cost. Therefore, it is of great practical significance to improve the super-hydrophobic process of the cotton fabric in the prior art to obtain a cotton fabric with high super-hydrophobicity and low cost. SUMMARY

[0005] In view of the above-mentioned drawbacks in the prior art, the purpose of the present application is to provide a super-hydrophobic cotton fabric and a preparation method thereof.

[0006] The application aims to provide a super-hydrophobic cotton fabric, which has the characteristics of super-hydrophobicity, antibiosis, environmental protection, etc.

[0007] The application is achieved by the following technical scheme:

[0008] A preparation method of a super-hydrophobic cotton fabric, comprising the following steps:

[0009] (1) Preparation of the spinning solution: dissolve the pore-forming agent and polystyrene in dimethylformamide (DMF) and uniformly stir to prepare the spinning solution.

[0010] Preferably, the use amount ratio of the pore-forming agent, polystyrene and dimethylformamide is 1g:(10-20)g:(100-200)mL.

[0011] Preferably, the pore-forming agent is fatty alcohol polyoxyethylene ether (AEO-9).

[0012] The application selects AEO-9 as the organic pore-forming agent, which can be removed by washing to increase the roughness of the surface of the cotton fabric.

[0013] (2) Pretreatment of the cotton fabric: place the cotton fabric in a mixed solution containing hydrogen peroxide, sodium carbonate, sodium sulfite and tap water for treatment at room temperature, and the treatment time is 5-15 minutes.

[0014] Preferably, the use amount ratio of the hydrogen peroxide, sodium carbonate, sodium sulfite, cotton fabric and tap water is 1mL:(0.1-0.2)g:(0.3-0.5)g:(3-5)g:(100-200)mL.

[0015] (3) Electrospinning: attach the cotton fabric pretreated in step (2) to the surface of the drum receiving device, and directly use the cotton fabric as the receiving substrate; directly spray the spinning solution prepared in step (1) on the cotton fabric for electrospinning, and keep the thickness of the electrospinning film uniform; after the spinning is completed, dry the cotton fabric covered with the electrospinning film to obtain the cotton fabric after spinning.

[0016] Preferably, the spinning voltage is 20-30kV, the injection speed is 0.3-0.5mL / h, and the receiving distance is 30-40cm.

[0017] Preferably, the drying time is 60-90min, and the drying temperature is 90-100℃.

[0018] (4) Surface treatment: the spun cotton fabric prepared in step (3) is immersed in tap water under the assistance of ultrasonic wave, and ultrasonic cleaning is carried out for 5-7 times, and finally, drying is carried out to prepare the super-hydrophobic cotton fabric.

[0019] Preferably, the use amount ratio of the spun cotton fabric to tap water is 1g:(100-200)mL.

[0020] Preferably, the frequency of the ultrasonic wave is 4-6Mz, and the sound intensity is 30-50W / cm 2 .

[0021] The present application has the following remarkable features:

[0022] (1) Polystyrene is a hydrophobic material, but its combination with cotton fabric is weak. The present inventors have unexpectedly found that after the cotton fabric is oxidized, polystyrene can be plated on the surface of the cotton fabric by using electrospinning technology, which significantly improves the hydrophobic property of the cotton fabric; it is further found that the finished cotton fabric still exhibits obvious hydrophobicity after multiple water washing.

[0023] (2) The present inventors have unexpectedly found that fatty alcohol polyoxyethylene ether (AEO-9) is easily soluble in water, and after it is dissolved in water, uneven traces are left on the surface, thereby the surface roughness of the cotton fabric is obviously enhanced, which is beneficial to the improvement of its hydrophobicity.

[0024] (3) The super-hydrophobic cotton fabric prepared by the present application contains hydrophobic material polystyrene on the surface, and the apparent contact angle of water droplets on the cotton fabric ranges from 151° to 154°, which exhibits good super-hydrophobicity; after 10 times of water washing, the hydrophobic property of the cotton fabric is still not obviously weakened; this indicates that the hydrophobic material polystyrene can be firmly attached to the surface of the cotton fabric.

[0025] (4) The super-hydrophobic cotton fabric prepared by the present application has a wide source of raw materials, a simple preparation process, and a good market prospect. DETAILED DESCRIPTION

[0026] The following examples and comparative examples illustrate the present application in detail.

[0027] Example 1

[0028] In the present embodiment, a preparation method of a super-hydrophobic cotton fabric comprises the following steps:

[0029] (1) Preparation of spinning solution: 1g of fatty alcohol polyoxyethylene ether (AEO-9) and 15g of polystyrene are dissolved in 150mL of dimethylformamide (DMF), and uniform stirring is carried out to prepare a spinning solution.

[0030] (2) Pretreatment of the cotton fabric: 40 g of cotton fabric was placed in a mixed solution containing 10 mL of hydrogen peroxide, 1.5 g of sodium carbonate, 4 g of sodium sulfite, and 1500 mL of tap water, and treated at room temperature for 10 minutes.

[0031] (3) Electrospinning: the cotton fabric pretreated in step (2) was attached to the surface of the drum receiving device, and the cotton fabric directly served as the receiving substrate; the spinning solution prepared in step (1) was directly sprayed on the cotton fabric for electrospinning, the thickness of the electrospun film was kept uniform, the spinning voltage was 25 kV, the injection speed was 0.4 mL / h, and the receiving distance was 35 cm; after the spinning was completed, the cotton fabric covered with the electrospun film was dried, the drying time was 75 min, and the drying temperature was 95°C, thereby obtaining the spun cotton fabric.

[0032] (4) Surface treatment: under the assistance of ultrasonic waves, the frequency of the ultrasonic waves was 5 Mz, the acoustic intensity was 40 W / cm 2 The spun cotton fabric prepared in step (3) was immersed in tap water, the use amount ratio of the spun cotton fabric to tap water was 1 g: 150 mL; ultrasonic cleaning was performed for 6 times, and finally, drying was performed, thereby obtaining the super-hydrophobic cotton fabric a.

[0033] Example 2

[0034] In this example, a method for preparing a super-hydrophobic cotton fabric, the method comprising the following steps:

[0035] (1) Preparation of the spinning solution: 1 g of fatty alcohol polyoxyethylene ether (AEO-9) and 10 g of polystyrene were dissolved in 100 mL of dimethylformamide (DMF), and uniform stirring was performed, thereby obtaining the spinning solution.

[0036] (2) Pretreatment of the cotton fabric: 30 g of cotton fabric was placed in a mixed solution containing 10 mL of hydrogen peroxide, 1 g of sodium carbonate, 3 g of sodium sulfite, and 1000 mL of tap water, and treated at room temperature for 5 minutes.

[0037] (3) Electrospinning: the cotton fabric pretreated in step (2) was attached to the surface of the drum receiving device, and the cotton fabric directly served as the receiving substrate; the spinning solution prepared in step (1) was directly sprayed on the cotton fabric for electrospinning, the thickness of the electrospun film was kept uniform, the spinning voltage was 20 kV, the injection speed was 0.3 mL / h, and the receiving distance was 30 cm; after the spinning was completed, the cotton fabric covered with the electrospun film was dried, the drying time was 60 min, and the drying temperature was 90°C, thereby obtaining the spun cotton fabric.

[0038] (4) Surface treatment: under the assistance of ultrasonic waves, the frequency of the ultrasonic waves was 4 Mz, the acoustic intensity was 30 W / cm 2The spun cotton fabric prepared in step (3) is immersed in tap water, the use amount ratio of the spun cotton fabric to the tap water is 1 g: 100 mL; ultrasonic cleaning is performed for 5 times, finally, drying is performed, to obtain the super-hydrophobic cotton fabric b.

[0039] Example 3

[0040] In this example, a preparation method of a super-hydrophobic cotton fabric, the preparation method comprises the following steps:

[0041] (1) Preparation of a spinning solution: 1 g of fatty alcohol polyoxyethylene ether (AEO-9) and 20 g of polystyrene are dissolved in 200 mL of dimethylformamide (DMF), uniform stirring is performed, to obtain the spinning solution.

[0042] (2) Pretreatment of the cotton fabric: 50 g of the cotton fabric is placed in a mixed solution containing 10 mL of hydrogen peroxide, 2 g of sodium carbonate, 5 g of sodium sulfite and 2000 mL of tap water, and is treated at room temperature, the treatment time is 15 minutes.

[0043] (3) Electrospinning: the cotton fabric pretreated in step (2) is attached to the surface of a drum receiving device, and the cotton fabric directly serves as a receiving substrate; the spinning solution prepared in step (1) is directly sprayed on the cotton fabric to perform electrospinning, the thickness of the electrospun film is uniform, the spinning voltage is 30 kV, the injection speed is 0.5 mL / h, and the receiving distance is 40 cm; after the spinning is completed, the cotton fabric covered with the electrospun film is dried, the drying time is 90 min, and the drying temperature is 100 ℃, to obtain the spun cotton fabric.

[0044] (4) Surface treatment: under the assistance of ultrasonic waves, the frequency of the ultrasonic waves is 6 Mz, the acoustic intensity is 50 W / cm 2 The spun cotton fabric prepared in step (3) is immersed in tap water, the use amount ratio of the spun cotton fabric to the tap water is 1 g: 200 mL; ultrasonic cleaning is performed for 7 times, finally, drying is performed, to obtain the super-hydrophobic cotton fabric c.

[0045] Comparative Example A

[0046] In this comparative example, the pore-forming agent is changed, that is, the “pore-forming agent is fatty alcohol polyoxyethylene ether” in step (1) is changed to “pore-forming agent is ammonium bicarbonate”, and other preparation methods are implemented according to the preparation method of Example 1, to obtain cotton fabric d.

[0047] Comparative Example B

[0048] In this comparative example, the cotton fabric is not pretreated, that is, the pretreatment of the cotton fabric in step (2) is not implemented, and other preparation methods are implemented according to the preparation method of Example 1, to obtain cotton fabric e.

[0049] Comparative Example C

[0050] Comparative Example C

[0051] Comparative Example D

[0052] Comparative Example D

[0053] Super-hydrophobic property test:

[0054] In order to better detect the super-hydrophobicity of the super-hydrophobic cotton fabric prepared in the application, the cotton fabrics a, b, c, d, e, f, g prepared in the above specific examples 1-3 and comparative examples A-D in the application were selected. The apparent contact angle of water droplets on the surface of the super-hydrophobic cotton fabric was measured by using an XG-CAMA1 basic type contact angle tester, and the test samples were not less than 30, and the average value was taken. The test fabric was washed according to the standard washing method of GB / T 20944.1-2007 color fastness to washing test machine, and the super-hydrophobic properties of the initial sample and the sample after 10 times of washing were tested, and the test results are shown in Table 1.

[0055] Table 1 apparent contact angle of water droplets on the surface of the cotton fabric a, b, c, d, e, f, g prepared in examples 1-3 and comparative examples A-C

[0056] apparent contact angle (°) a b c d e f g no water wash 152.6 153.2 151.4 107.3 88.5 94.7 79.3 water wash 10 times 148.7 147.6 149.3 76.4 65.3 72.8 109.8

[0057] From Table 1, it can be seen that when the cotton fabric is not washed, the apparent contact angle of water droplets on the surface of the cotton fabric a, b, c prepared in examples 1-3 is in the range of 151°-154°; after 10 times of washing, the hydrophobic property of the fabric a, b, c is still not obviously weakened. Therefore, it can be considered that the cotton fabric prepared in the application has super-hydrophobicity. The super-hydrophobicity of the super-hydrophobic cotton fabric d, e, f, g prepared in comparative examples A-C is obviously poor, which shows that the selection of pore-forming agent, the pretreatment of the cotton fabric, the change of spinning conditions and the washing times all have important influence on the super-hydrophobic property of the cotton fabric.

Claims

1. A method of making a superhydrophobic cotton fabric, characterized in that, The preparation method comprises the following steps: (1) preparation of the spinning solution: the pore-forming agent and polystyrene are dissolved in dimethylformamide, and stirred uniformly to obtain the spinning solution; (2) pretreatment of the cotton fabric: the cotton fabric is placed in a mixed solution containing hydrogen peroxide, sodium carbonate, sodium sulfite and tap water, and treated at room temperature for 5-15 minutes; (3) electrospinning: the cotton fabric treated in step (2) is attached to the surface of a drum receiving device, and the cotton fabric directly serves as the receiving substrate; the spinning solution prepared in step (1) is directly sprayed on the cotton fabric for electrospinning, and the thickness of the electrospinning film is kept uniform; after the electrospinning is completed, the cotton fabric covered with the electrospinning film is dried to obtain the cotton fabric after spinning; (4) surface treatment: the cotton fabric after spinning prepared in step (3) is immersed in tap water under the assistance of ultrasonic waves, and ultrasonic cleaning is performed for 5-7 times; finally, drying is performed to obtain the super-hydrophobic cotton fabric.

2. A method of making a superhydrophobic cotton fabric according to claim 1, characterized in that, In step (1), the amount ratio of the pore-forming agent, polystyrene and dimethylformamide is 1g:(10-20)g:(100-200)mL; the pore-forming agent is fatty alcohol polyoxyethylene ether (AEO-9).

3. A method of making a superhydrophobic cotton fabric according to claim 1, wherein, In step (2), the amount ratio of hydrogen peroxide, sodium carbonate, sodium sulfite, cotton fabric and tap water is 1mL:(0.1-0.2)g:(0.3-0.5)g:(3-5)g:(100-200)mL.

4. A method of making a superhydrophobic cotton fabric according to claim 1, wherein, In step (3), the spinning voltage is 20-30kV, the injection speed is 0.3-0.5mL / h, and the receiving distance is 30-40cm; the drying time is 60-90min, and the drying temperature is 90-100℃.

5. A method of making a superhydrophobic cotton fabric according to claim 1, wherein, The ratio of the spun cotton fabric to tap water in step (4) is 1g∶(100-200)mL; the frequency of the ultrasonic wave is 4-6Mz, and the sound intensity is 30-50W / cm 2 .

6. A superhydrophobic cotton fabric characterized in that, The cotton fabric is prepared by the method according to any one of claims 1-5.