Super hydrophobic linen fabric and preparation method thereof

Abstract

The present invention relates to a super-hydrophobic linen fabric and a preparation method thereof. The fabric can be prepared by the following method: first, a polyacrylic acid coating agent is prepared using acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate, etc.; then, the linen fabric is subjected to a coating finishing process; and finally, the finished linen fabric is subjected to an Ar plasma irradiation treatment to produce the super-hydrophobic linen fabric. The surface of the super-hydrophobic linen fabric prepared by the present invention contains silicon, a low-surface-energy substance. The apparent contact angle of a water droplet on the linen fabric ranges from 154° to 158°, exhibiting excellent super-hydrophobicity. Even after 10 washes, the linen fabric's hydrophobicity remains unchanged.

Description

Technical Field

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

[0002] In recent years, superhydrophobic textile fabrics have attracted widespread attention due to their excellent properties of waterproofing, anti-fouling, self-cleaning and reducing fluid viscosity. They have potential applications in waterproof clothing, protective clothing, industrial waterproof fabrics, medical fabrics, interior decorations, self-cleaning materials, microfluidic systems, lossless liquid transmission and biocompatibility, and have become a hot topic in the research of functional textile fabrics.

[0003] Flax is classified into three categories: fiber, oil, and both fiber and oil. All are annual herbs. Due to its good moisture absorption, rapid moisture conduction, and relatively fine diameter, it is a primary fiber for spring and summer clothing. Cloth woven from flax fibers is typically called linen fabric. Linen fabrics offer thermoregulatory, anti-allergic, anti-static, and antibacterial properties. Internationally, linen products include handkerchiefs, shirting, crepe, fancy yarns, sportswear, and linen-wool blends. Household products include curtains, wall coverings, tablecloths, and bedding. Industrial products include canvas, luggage tents, insulation fabrics, filter fabrics, and aviation products.

[0004] Literature research shows that the super-hydrophobic properties of linen fabrics have received widespread attention. For example, Chinese invention patent application No. 202020656003.1 discloses a preparation process for antibacterial and hydrophobic linen and rayon interwoven fabrics: an antibacterial fabric linen textile yarn woven from an antibacterial and hydrophobic linen main yarn and a spice textile yarn is intertwined with an antibacterial fabric rayon interwoven yarn woven from a rayon outer layer structure and antibacterial fibers to prepare the desired antibacterial and hydrophobic linen and rayon interwoven fabric. At present, there are still some shortcomings in the existing hydrophobic linen textile fabrics. For example, when the humidity is high and the ambient temperature is high, the excess water contained in the linen textile fabric is not easy to evaporate and dissipate, and the linen textile fabric will not maintain a water balance state, which reduces the comfort of the cotton and linen textile fabric when worn on the body. Therefore, improving the existing technology and developing a linen fabric with excellent super-hydrophobic properties is one of the current development trends. Summary of the Invention

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

[0006] The present invention aims to provide a super-hydrophobic linen fabric, which has the characteristics of being super-hydrophobic and environmentally friendly. The fabric can be prepared by the following method: first, a polyacrylic acid coating agent is prepared by using acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate, etc.; then, the linen fabric is subjected to coating finishing; and finally, the finished linen fabric is subjected to Ar plasma irradiation treatment to obtain the super-hydrophobic linen fabric.

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

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

[0009] (1) Preparation of coating agent: Sodium dodecylbenzenesulfonate, octylphenol polyoxyethylene ether (OP-10), acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate and ammonium persulfate are weighed, and all of the sodium dodecylbenzenesulfonate, octylphenol polyoxyethylene ether (OP-10) and 1 / 3 of the total amount of acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate and ammonium persulfate initiator are dissolved in deionized water, and the mixture is stirred evenly at a temperature of 75-85°C for 1-2 hours. Then, the remaining 2 / 3 of the acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate and ammonium persulfate initiator are dissolved in deionized water and added dropwise to the mixed solution just stirred, and the addition time is controlled to be 2-3 hours. After the addition is completed, the mixture is kept warm for 2-3 hours. The coating agent is obtained by allowing the emulsion to stand for one month without stratification or precipitation.

[0010] Preferably, the usage ratio of sodium dodecylbenzenesulfonate (g), octylphenol polyoxyethylene ether (OP-10) (g), acrylic acid (mol), vinyl-terminated polydimethylsiloxane (mol), butyl acrylate (mol) and ammonium persulfate (g) is: 1:1-2:0.1-0.2:0.1-0.2:0.1-0.2:0.5-1.

[0011] (2) Coating finishing: Stretch the fabric tightly on the stretcher, and evenly apply the coating agent on the fabric with a scraper. The dry weight of the coating is 5-15g / m 2 , drying at 80-90°C for 3-5 minutes, and baking at 110-120°C for 2-4 minutes to obtain the coated linen fabric.

[0012] Preferably, the fabric is linen fabric.

[0013] (3) Post-treatment of linen fabric: The coated linen fabric was placed at a distance of 50 to 100 cm from the plasma nozzle for Ar plasma irradiation treatment to obtain superhydrophobic linen fabric.

[0014] Preferably, the treatment conditions are: irradiation power 100-200W, irradiation time 10-20 minutes.

[0015] The present invention has the following notable features:

[0016] (1) The coating agent prepared by the present invention contains silicon element, a low surface energy substance, and is attached to the surface of the linen fabric through coating finishing technology.

[0017] (2) The inventors of the present application unexpectedly discovered that when the coated linen fabric is subjected to Ar plasma irradiation treatment, a rough micro-nano structure is formed on the surface of the linen fabric, which significantly enhances the hydrophobicity of the linen fabric.

[0018] (3) The surface of the super-hydrophobic linen fabric prepared by the present invention contains silicon, a low surface energy substance. The apparent contact angle of water droplets on the linen fabric ranges from 154° to 158°, and it exhibits excellent super-hydrophobicity. After 10 washes, the hydrophobicity of the linen fabric is still not significantly weakened.

[0019] (4) The super-hydrophobicity of the super-hydrophobic linen fabric prepared by the present invention is not significantly weakened after 10 washings, which indicates that low surface energy substances can firmly adhere to the surface of the linen fabric.

[0020] (5) The super-hydrophobic linen fabric prepared by the present invention has a wide range of raw material sources, a simple preparation process, and has good market promotion prospects. DETAILED DESCRIPTION

[0021] Source of main raw materials: Vinyl-terminated polydimethylsiloxane (model: 68083-18-1) was purchased from Wuhan Fude Chemical Co., Ltd.

[0022] The following examples and comparative examples illustrate the present invention in detail.

[0023] Example 1

[0024] In this embodiment, a method for preparing a super-hydrophobic linen fabric comprises the following steps:

[0025] (1) Preparation of coating agent: Weigh 1 g of sodium dodecylbenzenesulfonate, 1.5 g of octylphenol polyoxyethylene ether (OP-10), 0.15 mol of acrylic acid, 0.15 mol of vinyl-terminated polydimethylsiloxane, 0.15 mol of butyl acrylate and 0.75 g of ammonium persulfate, dissolve all of the sodium dodecylbenzenesulfonate, octylphenol polyoxyethylene ether (OP-10) and 1 / 3 of the total amount of acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate and ammonium persulfate initiator in 300 mL of deionized water, stir evenly, control the temperature to 80°C, and stir for 1.5 h; then, dissolve the remaining 2 / 3 of acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate and ammonium persulfate initiator in 300 mL of deionized water and add dropwise to the mixed solution just stirred, control the addition time to 2.5 h, and keep warm for 2.5 h after the addition is completed; the coating agent can be obtained by leaving the emulsion for one month without stratification or precipitation.

[0026] (2) Coating finishing: Stretch the linen fabric tightly on the stretcher frame, and evenly apply the coating agent on the fabric with a scraper. The dry weight of the coating is 10g / m 2 , drying at 85°C for 4 minutes, and baking at 115°C for 3 minutes to obtain coated linen fabric.

[0027] (3) Post-treatment of linen fabric: The coated linen fabric was placed at a distance of 70 cm from the plasma nozzle for Ar plasma irradiation treatment with an irradiation power of 150 W and an irradiation time of 15 min to obtain superhydrophobic linen fabric a.

[0028] Example 2

[0029] In this embodiment, a method for preparing a super-hydrophobic linen fabric comprises the following steps:

[0030] (1) Preparation of coating agent: Weigh 1 g of sodium dodecylbenzenesulfonate, 1.0 g of octylphenol polyoxyethylene ether (OP-10), 0.1 mol of acrylic acid, 0.1 mol of vinyl-terminated polydimethylsiloxane, 0.1 mol of butyl acrylate and 0.5 g of ammonium persulfate, dissolve all of the sodium dodecylbenzenesulfonate, octylphenol polyoxyethylene ether (OP-10) and 1 / 3 of the total amount of acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate and ammonium persulfate initiator in 300 mL of deionized water, stir evenly, control the temperature to 75°C, and stir for 1 hour; then, dissolve the remaining 2 / 3 of acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate and ammonium persulfate initiator in 300 mL of deionized water and add dropwise to the mixed solution just stirred, control the addition time to 2 hours, and keep warm for 2 hours after the addition is completed; the coating agent can be obtained by leaving the emulsion for one month without stratification or precipitation.

[0031] (2) Coating finishing: Stretch the linen fabric tightly on the stretcher frame, and evenly apply the coating agent on the fabric with a scraper. The dry weight of the coating is 5g / m 2 , drying at 80℃ for 3 minutes, and baking at 110℃ for 2 minutes to obtain coated linen fabric.

[0032] (3) Post-treatment of linen fabric: The coated linen fabric was placed at a distance of 50 cm from the plasma nozzle for Ar plasma irradiation treatment with an irradiation power of 100 W and an irradiation time of 10 min to obtain superhydrophobic linen fabric b.

[0033] Example 3

[0034] In this embodiment, a method for preparing a super-hydrophobic linen fabric comprises the following steps:

[0035] (1) Preparation of coating agent: Weigh 1 g of sodium dodecylbenzenesulfonate, 2 g of octylphenol polyoxyethylene ether (OP-10), 0.2 mol of acrylic acid, 0.2 mol of vinyl-terminated polydimethylsiloxane, 0.2 mol of butyl acrylate and 1 g of ammonium persulfate, dissolve all of the sodium dodecylbenzenesulfonate, octylphenol polyoxyethylene ether (OP-10) and 1 / 3 of the total amount of acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate and ammonium persulfate initiator in 300 mL of deionized water, stir evenly, control the temperature to 85°C, and stir for 2 h; then, dissolve the remaining 2 / 3 of acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate and ammonium persulfate initiator in 300 mL of deionized water and add dropwise to the mixed solution just stirred, controlling the addition time to 3 h. After the addition is completed, keep the mixture warm for 3 h. The coating agent can be obtained by leaving the emulsion for one month without stratification or precipitation.

[0036] (2) Coating finishing: Stretch the linen fabric tightly on the stretcher frame, and evenly apply the coating agent on the fabric with a scraper. The dry weight of the coating is 15g / m 2 , drying at 90°C for 5 minutes, and baking at 120°C for 4 minutes to obtain coated linen fabric.

[0037] (3) Post-treatment of linen fabric: The coated linen fabric was placed at a distance of 100 cm from the plasma nozzle for Ar plasma irradiation treatment with an irradiation power of 200 W and an irradiation time of 20 min to obtain superhydrophobic linen fabric c.

[0038] Comparative Example A

[0039] Taking Example 1 as a comparison, in this comparative example, the "vinyl-terminated polydimethylsiloxane" in step (1) is not selected, that is, the "vinyl-terminated polydimethylsiloxane" in step (1) is replaced with "styrene", and the other preparation methods are implemented according to the preparation method of Example 1 to obtain linen fabric d.

[0040] Comparative Example B

[0041] In contrast to Example 1, in this comparative example, the coating amount was changed, that is, the coating amount in step (2) was changed to 10 g / m 2 "Change to "Coating weight dry weight is 50g / m 2 ", the other preparation methods were implemented according to the preparation method of Example 1 to obtain linen fabric e.

[0042] Comparative Example C

[0043] In this comparative example, the irradiation power and time were changed, that is, the "irradiation power 150 W, irradiation time 15 min" in step (3) was changed to "irradiation power 15 W, irradiation time 3 min", and the other preparation methods were implemented according to the preparation method of Example 1 to obtain linen fabric f.

[0044] Super hydrophobic performance test:

[0045] To better test the superhydrophobicity of the superhydrophobic linen fabrics prepared in the present invention, linen fabrics a, b, c, d, e, and f, prepared in Examples 1-3 and Comparative Examples A-C, were selected. The apparent contact angle of a water droplet on the superhydrophobic linen fabrics was measured using an XG-CAMA1 basic contact angle tester. At least 30 test specimens were tested, and the average value was calculated. The test fabrics were subjected to a standard wash according to the washing method specified in GB / T 20944.1-2007 for color fastness to washing. The superhydrophobicity of the initial sample and the sample after 10 washes were tested. The test results are shown in Table 1.

[0046] Table 1 Apparent contact angles of water droplets on linen fabrics a, b, c, d, e, and f

[0047]

[0048] As shown in Table 1, when unwashed, the apparent contact angles of water droplets on linen fabrics a, b, and c ranged from 154° to 158°, respectively. After 10 washes, the hydrophobic properties of fabrics a, b, and c remained unchanged. Typically, an apparent contact angle greater than 150° indicates superhydrophobicity. Therefore, it can be concluded that the superhydrophobic linen fabrics prepared by the present invention possess superhydrophobicity. The superhydrophobic properties of linen fabrics d, e, and f prepared in Comparative Examples AC were significantly poorer, indicating that the selection of vinyl-terminated polydimethylsiloxane, coating amount, irradiation power, and exposure time all have a significant impact on the superhydrophobic properties of linen fabrics.

Claims

1. A method for preparing super hydrophobic linen fabric, characterized in that: The preparation method comprises the following steps: (1) Preparation of coating agent: Weigh sodium dodecylbenzenesulfonate, octylphenol polyoxyethylene ether, acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate and ammonium persulfate, dissolve all sodium dodecylbenzenesulfonate, octylphenol polyoxyethylene ether and 1 / 3 of the total amount of acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate and ammonium persulfate initiator in deionized water, stir evenly, control the temperature to 75-85°C, and stir for 1-2 hours; then, dissolve the remaining 2 / 3 of acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate and ammonium persulfate initiator in deionized water and add dropwise to the mixed solution just stirred, control the addition time to 2-3 hours, and keep warm for 2-3 hours after the addition is completed; the coating agent can be obtained by placing the emulsion for one month without stratification or precipitation; (2) Coating finishing: Stretch the fabric tightly on the stretcher, and evenly apply the coating agent on the fabric with a scraper. The dry weight of the coating is 5-15g / m 2 , drying at 80-90°C for 3-5 minutes, and baking at 110-120°C for 2-4 minutes to obtain a coated linen fabric; (3) Post-treatment of linen fabric: The coated linen fabric was placed at a distance of 50 to 100 cm from the plasma nozzle for Ar plasma irradiation to obtain super-hydrophobic linen fabric.

2. The method for preparing a super-hydrophobic linen fabric according to claim 1, wherein: The amount ratio of sodium dodecylbenzenesulfonate, octylphenol polyoxyethylene ether, acrylic acid, vinyl-terminated polydimethylsiloxane, butyl acrylate and ammonium persulfate in step (1) is: 1g: (1-2)g: (0.1-0.2)mol: (0.1-0.2)mol: (0.1-0.2)mol: (0.5-1)g.

3. The method for preparing a super-hydrophobic linen fabric according to claim 1, wherein: The fabric described in step (2) is suitable for linen fabric.

4. The method for preparing a super-hydrophobic linen fabric according to claim 1, wherein: The treatment conditions in step (3) are: irradiation power 100-200 W, irradiation time 10-20 min.

5. A super hydrophobic linen fabric, characterized in that: The invention is prepared by the method according to any one of claims 1 to 4.

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