Super-hydrophobic acrylic fabric and preparation method thereof

Abstract

The invention relates to a super-hydrophobic acrylic fabric and a preparation method thereof. The fabric can be prepared by adopting the following method: firstly, preparing titanium sol; secondly, a silane coupling agent KH-570 is subjected to hydrolysis, and a hydrolysis product is prepared; then, the titanium sol and a hydrolysis product of a silane coupling agent KH-570 are subjected to a reaction, and silane coupling agent modified nano TiO2 is prepared; thirdly, preparing finishing liquid; and finally, performing infiltration finishing on the acrylic fabric in the finishing liquid, and drying to obtain the super-hydrophobic acrylic fabric. The surface of the prepared super-hydrophobic acrylic fabric contains a hydrophobic material nano TiO2, the apparent contact angle range of water drops in the acrylic fabric is 155-159 degrees, and the super-hydrophobic acrylic fabric shows good super-hydrophobicity; after 10 times of water washing, the hydrophobicity of the acrylic fabric is still not obviously weakened.

Description

Technical Field

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

[0002] As people's living standards continue to improve, people's requirements for clothing are getting higher and higher. Therefore, clothing fabrics with different specific functions have come into being. Acrylic fabrics are fabrics woven from acrylic fibers. Acrylic fiber, scientifically known as polyacrylonitrile fiber, is a fiber made by spinning acrylonitrile as the main monomer (content greater than 85%) and a small amount of other monomers. Acrylic fiber has a wide range of uses, abundant raw materials, and a rapid development speed. Today, it is one of the three major synthetic fibers, and its output is second only to polyester and nylon. Acrylic fabrics, commonly known as artificial wool, have a soft and fluffy feel similar to wool fabrics, and bright colors, and are deeply loved by consumers.

[0003] However, the wear resistance of existing acrylic fabrics is the worst among all synthetic fiber fabrics. It is easy to wear, has poor waterproof and breathable properties, is not ideal in durability, has poor warmth retention in low temperature environments, and has poor antibacterial and antibacterial properties, which cannot meet consumers' needs for clothing during fitness and outdoor sports. Therefore, preparing an acrylic fabric with excellent hydrophobic properties is one of the current trends in fabric development.

[0004] Literature research shows that various properties of acrylic fabrics have received widespread attention. For example, China Invention Patent Application No. 202020514312.5 discloses a preparation process for heat-insulating acrylic fabrics: the present invention sets a ceramic fiber cloth layer because the ceramic fiber cloth layer improves the thermal insulation performance of the fabric, sets an aramid fiber layer, and improves the safety of the fabric while enhancing the thermal insulation, sets a polyester fiber layer to improve the wrinkle resistance and shape retention of the fabric, and sets a polytetrafluoroethylene layer to improve the waterproof performance of the fabric; China Invention Patent Application No. 201710486933.X discloses a preparation process for antistatic and antibacterial acrylic fabrics: using AZO antistatic suspension to treat acrylic spinning stock solution to prepare antistatic and antibacterial acrylic fibers, and then weaving base fabrics, and then finishing and drying to obtain acrylic fabrics. The fabric has low resistivity, good antistatic effect, strong durability, good stability, good mechanical properties, and is easy to dye and bright in color. The specific performance acrylic fabric prepared by the above method still has some shortcomings, such as the poor waterproof performance of the existing acrylic fabric. When the fabric is wet and close to the body, it will cause people to feel uncomfortable during use, which cannot meet the needs of users. Therefore, improving the preparation process of the existing specific performance acrylic fabric so that it also has excellent super-hydrophobic properties has important practical significance for the wider application of acrylic fabrics. Summary of the invention

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

[0006] The object of the present invention is to provide a super-hydrophobic acrylic fabric, which has the characteristics of super-hydrophobicity, antibacterial, environmental protection, etc. The fabric can be prepared by the following method: first, preparing titanium sol; secondly, hydrolyzing silane coupling agent KH-570 to obtain a hydrolyzate; then, reacting the titanium sol with the hydrolyzate of the silane coupling agent KH-570 to obtain a silane coupling agent-modified nano-TiO 2 ; Secondly, prepare a finishing liquid; finally, soak the acrylic fabric in the finishing liquid for finishing and drying to obtain a super-hydrophobic acrylic fabric.

[0007] The object of the present invention is achieved through the following technical solutions:

[0008] A method for preparing a super-hydrophobic acrylic fabric comprises the following steps:

[0009] (1) Preparation of titanium sol: Tetrabutyl titanate and triethanolamine were mixed at 50-70°C, and a mixture of deionized water, anhydrous ethanol and glacial acetic acid was added, and the mixture was stirred evenly for 2-4 hours to prepare titanium sol.

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

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

[0012] Preferably, the emulsifier is Span 60.

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

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

[0015]

[0016] (3) Reaction: Stirring the titanium sol prepared in step (1) and the hydrolyzate of the silane coupling agent KH-570 prepared in step (2) to obtain silane coupling agent-modified nano-TiO 2 .

[0017] Preferably, the ratio of the titanium sol prepared in step (1) to the hydrolyzate of the 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 as follows:

[0020]

[0021] (4) Preparation of finishing liquid: The nano-TiO modified with silane coupling agent obtained in step (3) 2 Dissolve ammonium persulfate in tap water and stir to prepare the finishing solution.

[0022] Preferably, the silane coupling agent modified nano-TiO 2 , the dosage ratio of ammonium persulfate and tap water is 1mL: (0.02~0.04)g: (100~200)mL.

[0023] (5) Fabric finishing: 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, washed with a large amount of tap water, and dried to obtain a super-hydrophobic acrylic fabric.

[0024] Mechanism analysis of the present invention: Nano-TiO 2 It has good hydrophobic properties, but there are technical difficulties in using it on the surface of fabrics. The applicant of the present invention unexpectedly discovered that silane coupling agent KH-570 can react with titanium sol for cross-linking. After the reaction, the cross-linked product of silane coupling agent KH-570 contains double bonds. Through polymerization reaction, the cross-linked product of silane coupling agent KH-570 is grafted onto the surface of fabrics, thereby achieving nano-TiO 2 The purpose of attachment to the fabric surface.

[0025] The present invention has the following notable features:

[0026] (1) Nano-TiO 2 It has good hydrophobic properties. The inventors of the present application unexpectedly discovered that the crosslinking agent silane coupling agent KH-570 can be used to crosslink it on the surface of acrylic fabric; the hydrophobicity of the crosslinked acrylic fabric is significantly improved.

[0027] (2) The inventors of the present application unexpectedly discovered that the cross-linked product of silane coupling agent KH-570 and titanium sol contains double bonds, and the cross-linked product is grafted onto the surface of acrylic fabric through polymerization reaction, thereby achieving nano-TiO 2 The purpose of adhering to the surface of acrylic fabric.

[0028] (3) The surface of the superhydrophobic acrylic fabric prepared by the present invention contains the hydrophobic material nano-TiO 2 , and the apparent contact angle of water droplets on the acrylic fabric ranges between 155° and 159°, showing excellent superhydrophobicity; after 10 washes, the hydrophobic performance of the acrylic fabric has not been significantly weakened.

[0029] (4) After 10 washes, the superhydrophobicity of the superhydrophobic acrylic fabric prepared by the present invention has not been significantly weakened, indicating that nano-TiO 2 can firmly adhere to the surface of the acrylic fabric.

[0030] (5) The raw materials of the superhydrophobic acrylic fabric prepared by the present invention are widely sourced, and the preparation process is simple, having good market promotion prospects. Specific Embodiments

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

[0032] Example 1

[0033] In this example, a method for preparing a superhydrophobic acrylic fabric, the preparation method comprising the following steps:

[0034] (1) Preparation of titanium sol: At 60°C, 10 mL of tetrabutyl titanate was mixed with 3 mL of triethanolamine, and a mixed solution of 60 mL of deionized water, 15 mL of absolute ethanol and 4 mL of glacial acetic acid was added, and stirred evenly for 3 hours to obtain titanium sol.

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

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

[0037]

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

[0039] (4) Preparation of finishing solution: 10 mL of the nano-TiO modified by silane coupling agent prepared in step (3) 2 and 0.3 g of ammonium persulfate were dissolved in 1500 mL of tap water, and stirred to prepare a finishing solution.

[0040] (5) Fabric finishing: The finishing liquid is heated to 75° C., and the acrylic fabric is immersed in the finishing liquid for 1.5 hours; the immersed acrylic fabric is taken out, washed with a large amount of tap water, and dried to obtain a superhydrophobic acrylic fabric.

[0041] Example 2

[0042] In this embodiment, a method for preparing a super hydrophobic acrylic fabric comprises the following steps:

[0043] (1) Preparation of titanium sol: At 50° C., 10 mL of tetrabutyl titanate and 2 mL of triethanolamine were mixed, and a mixture of 50 mL of deionized water, 10 mL of anhydrous ethanol and 3 mL of glacial acetic acid was added, and the mixture was stirred evenly for 2 hours to prepare titanium sol.

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

[0045] (3) Reaction: 100 mL of the titanium sol prepared in step (1) and 20 mL of the hydrolyzate of the silane coupling agent KH-570 prepared in step (2) were stirred and reacted at a temperature of 50° C. for 60 minutes to obtain nano-TiO modified by silane coupling agent. 2 .

[0046] (4) Preparation of finishing solution: 10 mL of the silane coupling agent-modified nano-TiO 2 Dissolve 0.2 g of ammonium persulfate in 1000 mL of tap water and stir to prepare a finishing solution.

[0047] (5) Fabric finishing: The finishing liquid is heated to 70° C., and the acrylic fabric is immersed in the finishing liquid for 1.0 hour; the immersed acrylic fabric is taken out, washed with a large amount of tap water, and dried to obtain a superhydrophobic acrylic fabric.

[0048] Example 3

[0049] In this embodiment, a method for preparing a super hydrophobic acrylic fabric comprises the following steps:

[0050] (1) Preparation of titanium sol: At 70° C., 10 mL of tetrabutyl titanate and 4 mL of triethanolamine were mixed, and a mixture of 70 mL of deionized water, 20 mL of anhydrous ethanol and 5 mL of glacial acetic acid was added, and the mixture was stirred evenly for 3 hours to prepare titanium sol.

[0051] (2) Hydrolysis: At room temperature, 200 mL of deionized water and 1 g of emulsifier Span 60 were added to a three-necked flask, and 2.0 g of silane coupling agent KH-570 was added and stirred for 60 min to obtain a hydrolysis product of silane coupling agent KH-570.

[0052] (3) Reaction: 100 mL of the titanium sol prepared in step (1) and 40 mL of the hydrolyzate of the silane coupling agent KH-570 prepared in step (2) were stirred and reacted at a temperature of 70° C. for 90 minutes to obtain nano-TiO modified by silane coupling agent. 2 .

[0053] (4) Preparation of finishing solution: 10 mL of the silane coupling agent-modified nano-TiO 2 Dissolve 0.4 g of ammonium persulfate in 2000 mL of tap water and stir to prepare a finishing solution.

[0054] (5) Fabric finishing: 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 taken out, washed with a large amount of tap water, and dried to obtain a superhydrophobic acrylic fabric.

[0055] Comparative Example A

[0056] Taking Example 1 as a comparison, in this comparative example, the emulsifier was changed, that is, the "emulsifier Span 60" in step (2) was replaced with "sodium chloride", and the other preparation methods were implemented according to the preparation method of Example 1.

[0057] Comparative Example B

[0058] Taking Example 1 as a comparison, in this comparative example, the reaction temperature and time of step (3) are changed, that is, the "reaction temperature is 60°C, and the reaction time is 75 minutes" in step (3) is changed to "reaction temperature is 30°C, and the reaction time is 10 minutes", and the other preparation methods are implemented according to the preparation method of Example 1.

[0059] Comparative Example C

[0060] Taking Example 1 as a comparison, in this comparative example, the temperature at which the finishing liquid is heated is changed, that is, "heating the finishing liquid to 75° C." in step (5) is changed to "heating the finishing liquid to 25° C.", and the other preparation methods are implemented according to the preparation method of Example 1.

[0061] Super hydrophobic performance test:

[0062] In order to better detect the super-hydrophobicity of the super-hydrophobic acrylic fabric prepared in the present invention, the super-hydrophobic acrylic fabrics a, b, c, d, e, and f prepared in the above-mentioned specific embodiments 1 to 3 and comparative examples A to C of the present invention are selected. The apparent contact angle of a water drop on the surface of the super-hydrophobic acrylic fabric is measured using an XG-CAMA1 basic contact angle tester, and no less than 30 test samples are tested, and the test average value is taken. The fabric to be tested is subjected to standard washing with reference to the washing method of the washing color fastness tester of GB / T 20944.1-2007, and the super-hydrophobicity of the initial sample and the sample after washing 10 times is tested. The test results are shown in Table 1.

[0063] Table 1 Apparent contact angles of water droplets on acrylic fabrics a, b, c, d, e, and f prepared in Examples 1 to 3 and Comparative Examples A to C

[0064]

[0065] As can be seen from Table 1, when the acrylic fabric is not washed, the apparent contact angle of the acrylic fabrics a, b, and c prepared in Examples 1 to 3 is between 155° and 159°; after 10 washes, the hydrophobic properties of fabrics a, b, and c are still not weakened. It can be considered that the super-hydrophobic acrylic fabric prepared by the present invention has super-hydrophobicity. The super-hydrophobicity of the super-hydrophobic acrylic fabrics d, e, and f prepared in Comparative Examples AC is significantly poor, which shows that the selection of emulsifiers, the temperature and time of the cross-linking reaction, and the temperature of heating the finishing liquid all have an important influence on the super-hydrophobicity of the acrylic fabric.

Claims

1. A method for preparing a super hydrophobic acrylic fabric, characterized in that: The preparation method comprises the following steps: (1) Preparation of titanium sol: at 50-70° C., tetrabutyl titanate and triethanolamine were mixed, and a mixture of deionized water, anhydrous ethanol and glacial acetic acid was added, and the mixture was stirred evenly for 2-4 hours to prepare titanium sol; (2) Hydrolysis: at room temperature, add deionized water and an emulsifier into a three-necked flask, add the silane coupling agent KH-570, and stir for 30 to 60 minutes to obtain a hydrolysis product of the silane coupling agent KH-570; (3) Reaction: stirring the titanium sol prepared in step (1) and the hydrolyzate of the silane coupling agent KH-570 prepared in step (2) to react to obtain nano-TiO2 modified by the silane coupling agent; (4) Preparation of finishing liquid: dissolving the silane coupling agent-modified nano-TiO2 and ammonium persulfate obtained in step (3) in tap water, and stirring to prepare a finishing liquid; (5) Fabric finishing: 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, washed with a large amount of tap water, and dried to obtain a super-hydrophobic acrylic fabric.

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

3. A method for preparing a super hydrophobic acrylic fabric according to claim 1, characterized in that, The emulsifier in step (2) is Span 60; the dosage 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 as follows:

4. The method for preparing a super hydrophobic acrylic fabric according to claim 1, wherein: In step (3), the ratio of the titanium sol prepared in step (1) to the hydrolyzate of the silane coupling agent KH-570 prepared in step (2) is 1 mL: (0.2-0.4) mL; the reaction temperature is 50-70° C., and the reaction time is 60-90 minutes.

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

6. A super hydrophobic acrylic fabric, characterized in that: The invention is prepared by the method according to any one of claims 1 to 5.

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