Super-hydrophobic acrylic fabric and preparation method thereof

Abstract

The application relates to a super-hydrophobic acrylic fabric and a preparation method thereof. The fabric can be prepared by the following method: firstly, titanium sol is prepared; secondly, a hydrolysis product is prepared by hydrolyzing silane coupling agent KH-570; then, the titanium sol is reacted with the hydrolysis product of the silane coupling agent KH-570 to prepare silane coupling agent modified nano-TiO2; thirdly, a finishing liquid is prepared; finally, the acrylic fabric is immersed and finished in the finishing liquid and dried to prepare the super-hydrophobic acrylic fabric. The super-hydrophobic acrylic fabric prepared by the application contains the hydrophobic material nano-TiO2 on the surface, the apparent contact angle of water drops on the acrylic fabric ranges from 155 DEG to 159 DEG, the super-hydrophobicity is good, and the hydrophobic property of the acrylic fabric is not obviously weakened after 10 times of washing.

Description

TECHNICAL FIELD

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

[0002] With the continuous improvement of people's living standards, people's requirements for clothes are also getting higher and higher, therefore, clothes fabrics with different specific functions have emerged as the times require. Acrylic fabric is a fabric woven from acrylic fibers. Acrylic fiber, also known as polyacrylonitrile fiber, is a fiber made of acrylonitrile as the main monomer (content greater than 85%) and a small amount of other monomers through copolymerization and spinning processing. Acrylic fiber has a wide range of applications, abundant raw materials, and a very fast development speed. Today, it is one of the three major synthetic fibers, and its output is only second to that of polyester and nylon. Acrylic fabric, commonly known as artificial wool, has a soft and fluffy hand feeling similar to wool fabric, and bright colors, which are deeply loved by consumers.

[0003] However, the wear resistance of the existing acrylic fabric is the worst among various synthetic fiber fabrics, it is easy to wear, has poor waterproof and breathable properties, and has poor durability, poor warmth in low-temperature environments, and poor antibacterial properties, which cannot meet the needs of consumers in fitness and outdoor sports. Therefore, preparing an acrylic fabric with excellent hydrophobic properties is one of the trends in the development of fabrics.

[0004] According to literature research, various properties of acrylic fabric have attracted widespread attention. For example, Chinese patent application No. 202020514312.5 discloses a preparation process of a heat-insulating acrylic fabric: the ceramic fiber cloth layer is arranged to improve the heat insulation performance of the fabric, the aramid fiber layer is arranged to enhance the heat insulation and improve the safety of the fabric, the polyester fiber layer is arranged to improve the wrinkle resistance and shape retention of the fabric, and the polytetrafluoroethylene layer is arranged to improve the waterproof performance of the fabric. Chinese patent application No. 201710486933.X discloses a preparation process of an anti-static and antibacterial acrylic fabric: an AZO anti-static suspension is used to treat acrylic spinning solution to prepare anti-static and antibacterial acrylic fibers, then a base cloth is woven, and the acrylic fabric is obtained through post-finishing and drying. The fabric has low resistivity, good anti-static effect, strong durability, good stability, good mechanical properties, and is easy to dye and has bright colors. The above-mentioned methods still have some deficiencies in preparing acrylic fabrics with specific properties, such as poor waterproof performance of the existing acrylic fabric. When the fabric is wet and close to the body, people will feel uncomfortable during use, which cannot meet the needs of users. Therefore, it is of great practical significance to improve the preparation process of the existing specific performance acrylic fabric to make it have excellent super-hydrophobic properties, and to make the acrylic fabric more widely used. SUMMARY

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

[0006] The present application aims to provide a super-hydrophobic acrylic fabric, which has the characteristics of super-hydrophobicity, antibacterial property, environmental protection, etc. The fabric can be prepared by the following method: first, preparing a titanium sol; second, hydrolyzing silane coupling agent KH-570 to obtain a hydrolysis product; then, reacting the titanium sol with the hydrolysis product of silane coupling agent KH-570 to obtain nano-TiO2 modified by silane coupling agent; third, preparing a finishing liquid; finally, immersing and finishing the acrylic fabric in the finishing liquid and drying to obtain the super-hydrophobic acrylic fabric.

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

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

[0009] (1) Preparation of titanium sol: mix tetrabutyl titanate and triethanolamine at 50-70℃, add a mixed solution of deionized water, anhydrous ethanol and glacial acetic acid, and uniformly stir for 2-4 hours to obtain the titanium sol.

[0010] Preferably, the volume ratio of tetrabutyl titanate (mL) to triethanolamine (mL) is 1:0.2-0.4, and the amount ratio of deionized water (mL), anhydrous ethanol (mL) and glacial acetic acid (mL) is 50-70:10-20:3-5.

[0011] (2) Hydrolysis: add deionized water and an emulsifier to a three-necked flask, add silane coupling agent KH-570, and stir for 30-60 minutes to obtain the hydrolysis product of silane coupling agent KH-570.

[0012] Preferably, the emulsifier is Span 60.

[0013] Preferably, the amount ratio of the emulsifier, silane coupling agent KH-570 and deionized water is 1g:(1-2)g:(100-200)mL.

[0014] The molecular structure of the silane coupling agent KH-570 is as follows:

[0015]

[0016] (3) Reaction: stir and react the titanium sol prepared in step (1) with the hydrolysis product of silane coupling agent KH-570 prepared in step (2) to obtain nano-TiO2 modified by silane coupling agent.

[0017] Preferably, the amount ratio of the titanium sol prepared in step (1) to the hydrolysis product of silane coupling agent KH-570 prepared in step (2) is 1 mL: (0.2-0.4) mL.

[0018] Preferably, the reaction temperature is 50-70°C, and the reaction time is 60-90 minutes.

[0019] The chemical reaction equation involved in this step is shown as follows:

[0020]

[0021] (4) Preparation of finishing liquid: the silane coupling agent modified nano-TiO2 and ammonium persulfate prepared in step (3) are dissolved in tap water to prepare the finishing liquid.

[0022] Preferably, the amount ratio of the silane coupling agent modified nano-TiO2, ammonium persulfate and tap water is 1 mL: (0.02-0.04) g: (100-200) mL.

[0023] (5) Finishing of fabric: the finishing liquid is heated to 70-80°C, and the acrylic fabric is immersed in the finishing liquid for 1-2 hours; the immersed acrylic fabric is taken out and washed with a large amount of tap water, and dried to obtain the super-hydrophobic acrylic fabric.

[0024] Mechanism analysis of the present application: nano-TiO2 has good hydrophobic property, but there are technical difficulties in using it on the surface of fabric. The applicant of the present application accidentally found that the silane coupling agent KH-570 can be crosslinked with the titanium sol, and the crosslinked product of the silane coupling agent KH-570 contains double bonds, which can be grafted onto the surface of fabric through polymerization reaction, so as to realize the purpose of attaching nano-TiO2 on the surface of fabric.

[0025] The present application has the following remarkable features:

[0026] (1) Nano-TiO2 has good hydrophobic property, and the inventor of the present application accidentally found that the crosslinking agent silane coupling agent KH-570 can be crosslinked on the surface of acrylic fabric; the hydrophobicity of the crosslinked acrylic fabric is obviously improved.

[0027] (2) The inventor of the present application accidentally found that the crosslinked product of the silane coupling agent KH-570 and the titanium sol contains double bonds, which can be grafted onto the surface of acrylic fabric through polymerization reaction, so as to realize the purpose of attaching nano-TiO2 on the surface of acrylic fabric.

[0028] (3) The super-hydrophobic acrylic fabric prepared by the present application has a surface containing hydrophobic material nano-TiO2, and the apparent contact angle of water droplets on the surface of the acrylic fabric ranges from 155° to 159°, which shows good super-hydrophobicity; after 10 times of washing, the hydrophobicity of the acrylic fabric is still not obviously weakened.

[0029] (4) The super-hydrophobic acrylic fabric prepared by the present application is not obviously weakened in super-hydrophobicity after 10 times of washing, which shows that the nano-TiO2 can be firmly attached to the surface of the acrylic fabric.

[0030] (5) The super-hydrophobic acrylic fabric prepared by the present application has a wide source of raw materials, a simple preparation process, and good market promotion prospects. DETAILED DESCRIPTION

[0031] The following examples and comparative examples illustrate the present application in detail.

[0032] Example 1

[0033] In this embodiment, a preparation method of a super-hydrophobic acrylic fabric includes the following steps:

[0034] (1) Preparation of titanium sol: 10 mL of tetrabutyl titanate and 3 mL of triethanolamine are mixed at 60°C, and a mixed solution of 60 mL of deionized water, 15 mL of anhydrous ethanol, and 4 mL of glacial acetic acid is added, and stirred uniformly for 3 hours to prepare titanium sol.

[0035] (2) Hydrolysis: 150 mL of deionized water and 1 g of emulsifier Span 60 are added to a three-necked flask, 1.5 g of silane coupling agent KH-570 is added, and stirred for 45 min to prepare a hydrolysis product of silane coupling agent KH-570.

[0036] The molecular structure of the silane coupling agent KH-570 is as follows:

[0037]

[0038] (3) Reaction: 100 mL of titanium sol prepared in step (1) is stirred and reacted with 30 mL of the hydrolysis product of silane coupling agent KH-570 prepared in step (2), the reaction temperature is 60°C, and the reaction time is 75 minutes to prepare nano-TiO2 modified by silane coupling agent.

[0039] (4) Preparation of finishing liquid: 10 mL of nano-TiO2 modified by silane coupling agent prepared in step (3) and 0.3 g of ammonium persulfate are dissolved in 1500 mL of tap water, and the finishing liquid is prepared by stirring.

[0040] (5) Fabric finishing: heat the finishing liquid to 75°C, put the acrylic fabric into the finishing liquid for 1.5 hours; take out the immersed acrylic fabric and wash it with a large amount of tap water, dry it, and obtain the super-hydrophobic acrylic fabric.

[0041] Example 2

[0042] In this embodiment, a preparation method of a super-hydrophobic acrylic fabric, the preparation method comprising the following steps:

[0043] (1) Preparation of titanium sol: mix 10 mL of tetrabutyl titanate with 2 mL of triethanolamine at 50°C, add a mixed solution of 50 mL of deionized water, 10 mL of anhydrous ethanol, and 3 mL of glacial acetic acid, and uniformly stir for 2 hours to obtain titanium sol.

[0044] (2) Hydrolysis: at room temperature, add 100 mL of deionized water and 1 g of emulsifier Span 60 into a three-necked flask, add 1.0 g of silane coupling agent KH-570, and stir for 30 min to obtain the hydrolysis product of silane coupling agent KH-570.

[0045] (3) Reaction: stir and react 100 mL of titanium sol prepared in step (1) with 20 mL of the hydrolysis product of silane coupling agent KH-570 prepared in step (2), the reaction temperature is 50°C, and the reaction time is 60 min to obtain nano-TiO2 modified by a silane coupling agent.

[0046] (4) Preparation of finishing liquid: dissolve 10 mL of nano-TiO2 modified by a silane coupling agent prepared in step (3) and 0.2 g of ammonium persulfate in 1000 mL of tap water, and stir to prepare the finishing liquid.

[0047] (5) Fabric finishing: heat the finishing liquid to 70°C, put the acrylic fabric into the finishing liquid for 1.0 hour; take out the immersed acrylic fabric and wash it with a large amount of tap water, dry it, and obtain the super-hydrophobic acrylic fabric.

[0048] Example 3

[0049] In this embodiment, a preparation method of a super-hydrophobic acrylic fabric, the preparation method comprising the following steps:

[0050] (1) Preparation of titanium sol: mix 10 mL of tetrabutyl titanate with 2 mL of triethanolamine at 50°C, add a mixed solution of 50 mL of deionized water, 10 mL of anhydrous ethanol, and 3 mL of glacial acetic acid, and uniformly stir for 2 hours to obtain titanium sol.

[0051] (2) Hydrolysis: at room temperature, add 100 mL of deionized water and 1 g of emulsifier Span 60 into a three-necked flask, add 1.0 g of silane coupling agent KH-570, and stir for 30 min to obtain the hydrolysis product of silane coupling agent KH-570.

[0052] (3) Reaction: 100 mL of the titanium sol prepared in step (1) is stirred with 40 mL of the silane coupling agent KH-570 hydrolysis product prepared in step (2) to prepare silane coupling agent modified nano-TiO2, with a reaction temperature of 70°C and a reaction time of 90 minutes.

[0053] (4) Preparation of finishing liquid: 10 mL of the silane coupling agent modified nano-TiO2 prepared in step (3) and 0.4 g of ammonium persulfate are dissolved in 2000 mL of tap water to prepare the finishing liquid.

[0054] (5) Finishing of fabric: the finishing liquid is heated to 80°C, and the acrylic fabric is immersed in the finishing liquid for 2.0 hours; the immersed acrylic fabric is washed with a large amount of tap water, dried, and an ultrahydrophobic acrylic fabric is prepared.

[0055] Comparative Example A

[0056] In comparison with Example 1, in the present comparative example, the emulsifier is changed, i.e., the "emulsifier Span 60" in step (2) is changed to "sodium chloride", and the other preparation methods are implemented according to the preparation methods of Example 1.

[0057] Comparative Example B

[0058] In comparison with Example 1, in the present comparative example, the reaction temperature and time of step (3) are changed, i.e., the "reaction temperature of 60°C and reaction time of 75 minutes" in step (3) is changed to "reaction temperature of 30°C and reaction time of 10 minutes", and the other preparation methods are implemented according to the preparation methods of Example 1.

[0059] Comparative Example C

[0060] In comparison with Example 1, in the present comparative example, the heating temperature of the finishing liquid is changed, i.e., the "finishing liquid is heated to 75°C" in step (5) is changed to "finishing liquid is heated to 25°C", and the other preparation methods are implemented according to the preparation methods of Example 1.

[0061] Ultrahydrophobic performance test:

[0062] In order to better detect the ultrahydrophobicity of the ultrahydrophobic acrylic fabric prepared in the present application, the ultrahydrophobic acrylic fabrics a, b, c, d, e and f prepared in the above specific examples 1-3 and comparative examples A-C of the present application are selected. The apparent contact angle of water droplets on the surface of the ultrahydrophobic acrylic fabric is measured by using an XG-CAMA1 basic type contact angle tester, and the test samples are not less than 30, and the average value is taken. The test sample is washed according to the standard washing method of GB / T 20944.1-2007 color fastness test machine, and the ultrahydrophobic performance of the initial sample and the sample after 10 times of washing is tested, and the test results are shown in Table 1.

[0063] Table 1 apparent contact angle of water droplets on the acrylic fabric a, b, c, d, e, f prepared in Examples 1-3 and Comparative Examples A-C

[0064]

[0065] From Table 1, it can be seen that when the acrylic fabric is not washed, the apparent contact angle of water droplets on the acrylic fabric a, b, c prepared in Examples 1-3 is in the range of 155-159°; after 10 times of washing, the hydrophobic property of the fabric a, b, c is still not weakened. It can be considered that the super-hydrophobic acrylic fabric prepared in the present application has super-hydrophobicity. The super-hydrophobicity of the super-hydrophobic acrylic fabric d, e, f prepared in Comparative Examples A-C is obviously poorer, which shows that the selection of emulsifier, the temperature and time of cross-linking reaction, and the heating temperature of finishing liquid all have important influence on the super-hydrophobic property of the acrylic fabric.

Claims

1. A method for preparing a superhydrophobic acrylic fabric, characterized in that, The preparation method includes the following steps: (1) Preparation of titanium sol: Tetrabutyl titanate and triethanolamine were mixed at 50-70℃, and a mixture of deionized water, anhydrous ethanol and glacial acetic acid was added. The mixture was stirred evenly for 2-4 hours to obtain titanium sol. (2) Hydrolysis: At room temperature, deionized water and emulsifier were added to a three-necked flask, and silane coupling agent KH-570 was added. The mixture was stirred for 30 to 60 minutes to obtain the hydrolysis product of silane coupling agent KH-570. (3) Reaction: The titanium sol prepared in step (1) was stirred and reacted with the hydrolysis product of silane coupling agent KH-570 prepared in step (2) to obtain silane coupling agent modified nano-TiO2. (4) Preparation of finishing solution: Dissolve the silane coupling agent modified nano-TiO2 and ammonium persulfate obtained in step (3) in tap water and stir to prepare finishing solution; (5) Finishing the fabric: Heat the finishing solution to 70-80°C, immerse the acrylic fabric in the finishing solution for 1-2 hours; take out the immersed acrylic fabric, wash it with a lot of tap water, and dry it to obtain superhydrophobic acrylic fabric. The emulsifier mentioned in step (2) is Span 60; the ratio of the emulsifier, silane coupling agent KH-570 and deionized water is 1g:(1-2)g:(100-200)mL; the molecular structure of the silane coupling agent KH-570 is shown in the figure below: ； In step (3), the ratio of the amount of titanium sol prepared in step (1) to the amount of silane coupling agent KH-570 hydrolysis product prepared in step (2) is 1 mL: (0.2-0.4) mL; the reaction temperature is 50-70℃ and the reaction time is 60-90 minutes.

2. The method for preparing a superhydrophobic acrylic fabric according to claim 1, characterized in that, In step (1), the volume ratio of tetrabutyl titanate to triethanolamine is 1 mL: (0.2-0.4) mL, and the ratio of deionized water, anhydrous ethanol, and glacial acetic acid is (50-70) mL: (10-20) mL: (3-5) mL.

3. The method for preparing a superhydrophobic acrylic fabric according to claim 1, characterized in that, In step (4), the ratio of the amount of nano-TiO2 modified by silane coupling agent, ammonium persulfate and tap water is 1 mL: (0.02-0.04) g: (100-200) mL.

4. A superhydrophobic acrylic fabric, characterized in that, It is prepared by the method described in any one of claims 1 to 3.

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