A cellulose fabric that rapidly transports moisture and a method of making the same

Abstract

The application discloses a cellulose fabric capable of rapidly transporting moisture and a preparation method thereof, and relates to the technical field of chemistry, textiles and material science and engineering. The preparation method comprises the following steps: firstly, a chemical reaction is carried out on one side of cellulose by coating the cellulose with an acid solution and a silane reagent in sequence; then, the treated cellulose is soaked in an alkaline solution to react; and finally, the sample is cleaned to prepare the cellulose fabric with the moisture rapid transport characteristic. The cellulose fabric prepared by the application has the ability of unidirectional moisture transport, and can rapidly and effectively remove human sweat. The method has the advantages of simple process, easy operation, rich raw material source, low cost, non-toxicity, high safety, good sweat removal performance of the prepared cellulose, high stability, air permeability and skin friendliness.

Description

Technical Field

[0001] This invention relates to a cellulose fabric for rapid moisture transfer and a method for preparing the same, and relates to the technical fields of chemistry, textiles, and materials science and engineering. Background Technology

[0002] Fabrics serve as a protective barrier between the human body and the external environment. With rapid technological advancements and rising living standards, people's demands for fabrics have evolved from simply covering the body to offering more functional options, such as rapid sweat wicking. When the human body is exposed to high temperatures for extended periods, heatstroke is highly likely to occur, impacting personal health.

[0003] Fabrics with rapid moisture wicking properties can quickly wick away sweat while keeping the skin dry, thereby lowering temperature and improving comfort in high-temperature conditions. The basic principle is the use of a two-sided asymmetric gradient structure (one side hydrophobic, the other hydrophilic) to achieve directional transport of liquids from the hydrophobic side to the hydrophilic side. When worn, the hydrophobic side faces the skin, allowing liquids to be quickly transferred from the skin to the surrounding environment, keeping the skin dry while lowering temperature and improving comfort.

[0004] Existing fabrics with rapid sweat-wicking function can achieve this through multi-layered structures. For example, patent CN208403362U, "A One-Way Moisture-Wicking Fabric," reports a one-way moisture-wicking fabric with a layer of absorbent material coated on the surface of cotton. However, the bonding force between the two materials is poor, resulting in poor stability of the fabric's one-way moisture-wicking performance. Patent CN112252019B processes one side of the fabric surface using laser direct writing to create different hydrophobicities on both sides. However, the poor interaction force between the multi-layered structure leads to weak bonding and a short service life. Furthermore, processing one side of the fabric surface using laser direct writing is relatively expensive. Summary of the Invention

[0005] In view of the poor stability, short service life and relatively high cost of existing fast-moisture / wicking cellulose fabrics, this invention provides a fast-moisture cellulose fabric and its preparation method.

[0006] To achieve the above objectives, the present invention adopts the following specific technical solution:

[0007] A method for preparing a cellulose fabric with rapid moisture transfer includes the following steps:

[0008] (1) Treat one side of the cellulose fabric with an acidic solution;

[0009] (2) The acid-treated surface of the cellulose fabric was treated again with silane reagent;

[0010] (3) Place the cellulose fabric treated in step (2) in an alkaline solution;

[0011] (4) Wash the cellulose fabric and dry it.

[0012] Furthermore:

[0013] The acidic solution mentioned in step (1) is hydrochloric acid, phosphoric acid, or acetic acid.

[0014] The concentration of the acidic solution in step (1) is 0.5wt%-10wt%.

[0015] The processing time for step (1) is 0.5-4 hours.

[0016] The silane reagent mentioned in step (2) is hexadecyltrimethoxysilane, octadecyltrimethoxysilane or octadecyltrichlorosilane.

[0017] The processing time for step (2) is 0.5-4 hours.

[0018] The alkaline solution mentioned in step (3) is KOH, NaOH or LiOH.

[0019] The concentration of the alkaline solution in step (3) is 5 wt%-20 wt%.

[0020] The soaking time of the alkaline solution in step (3) is 0.5-4h, and the temperature is 20-40℃.

[0021] The present invention also provides a cellulose fabric prepared by the above preparation method.

[0022] The specific technical principles are as follows:

[0023] An acidic solution hydrolyzes silane into silanol on the cellulose surface in situ. Then, under alkaline conditions, silane reacts with cellulose molecules and is stably attached to one side of the cellulose surface through chemical bonds, achieving hydrophobicity on that side. Simultaneously, the alkaline solution effectively swells the cellulose, increasing the hydrophilicity on the other side, ultimately constructing a cellulose structure with both a water-transporting and hydrophilic surface. This allows the cellulose fabric prepared by this invention to have unidirectional moisture transport capabilities, enabling rapid and effective removal of human sweat: when human sweat comes into contact with the hydrophobic surface of the cellulose, the sweat moisture is transported along the hydrophobic surface to the hydrophilic surface and eventually evaporates into the air; when air moisture comes into contact with the hydrophilic surface of the cellulose, the moisture diffuses within the fibers on the hydrophilic surface and does not travel to the hydrophobic side in contact with the human skin, thus hindering the transport of air moisture to the human body.

[0024] Compared with the prior art, the present invention has the following technical effects:

[0025] (1) The present invention utilizes silane reagent to hydrophobically modify one side of cellulose fabric, thereby constructing a hydrophobic cellulose fabric on one side and using alkaline solution treatment to enhance the hydrophilicity of the other side, thereby constructing an asymmetric gradient structure of cellulose, thus achieving the effect of efficient directional liquid transport (transferring water from the water-transporting side to the hydrophilic side).

[0026] (2) The present invention uses in-situ hydrophobic modification of cellulose fibers to give cellulose materials long-term stability. At the same time, alkaline treatment can achieve good hydrophilicity of the hydrophilic surface of cellulose, and the resulting fabric has good water transport performance.

[0027] (3) This invention not only has excellent unidirectional water conveyance performance, but also has a faster water evaporation rate and a good cooling effect compared with ordinary cellulose fabrics; it has high stability and maintains good unidirectional water conveyance performance and cooling effect after multiple uses and washing.

[0028] (4) The preparation method of the present invention is simple, efficient, clean and environmentally friendly, and the raw materials are cheap and readily available. Attached Figure Description

[0029] Figure 1 The contact angle of the hydrophobic side (150°) and the contact angle of the hydrophilic side (18°) of the cellulose fabric for rapid moisture transfer (Example 2).

[0030] Figure 2 The transport behavior of water droplets on the hydrophobic side (left) and hydrophilic side (right) of a rapidly moisture-transferring cellulose fabric (Example 2).

[0031] Figure 3 The transport behavior of water droplets on the hydrophilic side (left) and hydrophobic side (right) of a rapidly moisture-transferring cellulose fabric.

[0032] Figure 4 The graph shows the rate of water evaporation on the human body surface of the original cellulose fabric (left, control example 1) and the fast-transferring cellulose fabric (right, example 2).

[0033] Figure 5 The cooling effect of the original cellulose fabric (left, control example 1) and the rapidly moisture-transferring cellulose fabric (right, example 2) on the human body surface is shown in the diagram. Detailed Implementation

[0034] To make the content of this invention easier to understand, the technical solution of this invention will be further described below with reference to specific embodiments, but this invention is not limited thereto.

[0035] In the following examples and comparative examples, the specific composition of the cellulose fabrics is 100% cotton fiber.

[0036] Example 1

[0037] (1) Spray a 0.5% hydrochloric acid solution evenly onto one side of the cellulose fabric and let it stand for 0.5 hours.

[0038] (2) Coat one side of the pretreated cellulose fabric evenly with hexadecyltrimethoxysilane, and wash off the cellulose with water after 0.5 h.

[0039] (3) Prepare a 5% sodium hydroxide solution and soak the washed cellulose fabric in it for 1 hour at a temperature of 20°C.

[0040] (4) After the reaction is complete, the cellulose fabric from step (3) is taken out and dried to obtain a cellulose fabric with rapid moisture transfer.

[0041] A drop of water (approximately 200 μl) was placed on the skin surface and covered with a fast-drying cellulose fabric. The time for complete evaporation of the water was measured to be 6 minutes, with an average cooling effect of 2.5°C. After 10 washes, the cooling effect was measured again to be 2.4°C.

[0042] Note: After the moisture has evaporated, the temperature at several points on the fabric surface is measured using a temperature sensor, and the average temperature obtained is the average cooling effect.

[0043] Example 2

[0044] (1) Spray a 10% phosphoric acid solution evenly onto one side of the cellulose fabric and let it stand for 4 hours.

[0045] (2) Coat one side of the pretreated cellulose fabric evenly with octadecyltrimethoxysilane, and wash off the cellulose with water after 2 hours.

[0046] (3) Prepare a 20% lithium hydroxide solution and immerse the washed fabric in it for 1 hour at a temperature of 25°C.

[0047] (4) After the reaction is complete, the cellulose fabric from step (3) is taken out and dried to obtain a cellulose fabric with rapid moisture transfer.

[0048] like Figure 1 As shown, the hydrophobic surface of the fast-transferring cellulose fabric has a contact angle of 150°, and the hydrophilic surface has a contact angle of 18°, which respectively meet the industry standards for superhydrophobic and superhydrophilic fabrics.

[0049] Note: Standards may be referenced:

[0050] DB44 / T 1872-2016 Determination of surface wetting properties of textiles - Contact angle method

[0051] GB / T 42694-2023 Test and evaluation of the anti-wetting properties of textile surfaces - contact angle and roll-off angle.

[0052] like Figure 2 As shown, when a water droplet is on the hydrophobic side of a rapidly moisture-transferring cellulose fabric, the moisture will be transferred along the hydrophobic surface to the hydrophilic surface.

[0053] like Figure 3 As shown, when a water droplet is on the hydrophilic side of a rapidly moisture-transferring cellulose fabric, the moisture diffuses within the fibers on the hydrophilic side and is not transferred to the hydrophobic side.

[0054] like Figure 4 As shown, a drop of water (approximately 200 μl) was placed on the skin surface and covered with a fast-drying cellulose fabric. The time for complete evaporation of the water was measured to be 4 minutes, and the average cooling effect was 4.9℃. Figure 5 After 10 washes, the cooling effect was measured again as 4.9℃.

[0055] Example 3

[0056] (1) Spray a 5% acetic acid solution evenly onto one side of the cellulose fabric and let it stand for 2 hours.

[0057] (2) Coat one side of the pretreated cellulose fabric evenly with octadecyltrichlorosilane, and wash off the cellulose with water after 4 hours.

[0058] (3) Prepare a 5% potassium hydroxide solution and soak the washed cellulose fabric in it for 2 hours at a temperature of 40°C.

[0059] (4) After the reaction is complete, the cellulose fabric from step (3) is taken out and dried to obtain a cellulose fabric with rapid moisture transfer.

[0060] A drop of water (approximately 200 μl) was placed on the skin surface and covered with a fast-drying cellulose fabric. The time for complete evaporation of the water was measured to be 5 min 20 s, with an average cooling effect of 3.6℃. After 10 washes, the cooling effect was measured again to be 3.5℃.

[0061] Example 4

[0062] (1) Spray a 10% acetic acid solution evenly onto one side of the cellulose fabric and let it stand for 2 hours.

[0063] (2) Coat one side of the pretreated cellulose fabric evenly with octadecyltrichlorosilane, and wash off the cellulose with water after 1 hour.

[0064] (3) Prepare a 5% potassium hydroxide solution and soak the washed cellulose fabric in it for 2 hours at a temperature of 35°C.

[0065] (4) After the reaction is complete, the cellulose fabric from step (3) is taken out and dried to obtain a cellulose fabric with rapid moisture transfer.

[0066] A drop of water (approximately 200 μl) was placed on the skin surface and covered with a fast-drying cellulose fabric. The time for complete evaporation of the water was measured to be 5 minutes and 40 seconds, with an average cooling effect of 3.0°C. After 10 washes, the cooling effect was measured again to be 3.0°C.

[0067] Example 5

[0068] (1) Spray a 5% acetic acid solution evenly onto one side of the cellulose fabric and let it stand for 2 hours.

[0069] (2) Coat one side of the pretreated cellulose fabric evenly with octadecyltrichlorosilane, and wash off the cellulose with water after 3 hours.

[0070] (3) Prepare a 5% potassium hydroxide solution, and immerse the washed cellulose fabric in the solution for 3 hours at a temperature of 35°C.

[0071] (4) After the reaction is complete, the cellulose fabric from step (3) is taken out and dried to obtain a cellulose fabric with rapid moisture transfer.

[0072] A drop of water (approximately 200 μl) was placed on the skin surface and covered with a fast-drying cellulose fabric. The time for complete evaporation of the water was measured to be 4 minutes and 40 seconds, with an average cooling effect of 4.3°C. After 10 washes, the cooling effect was measured again to be 4.3°C.

[0073] Example 6

[0074] (1) Spray a 10% phosphoric acid solution evenly onto one side of the cellulose fabric and let it stand for 4 hours.

[0075] (2) Coat one side of the pretreated cellulose fabric evenly with octadecyltrimethoxysilane, and wash the cellulose fabric with water after 4 hours.

[0076] (3) Prepare a 20% potassium hydroxide solution and soak the washed cellulose fabric in it for 2 hours at a temperature of 20°C.

[0077] (4) After the reaction is complete, the cellulose fabric from step (3) is taken out and dried to obtain a cellulose fabric with rapid moisture transfer.

[0078] A drop of water (approximately 200 μl) was placed on the skin surface and covered with a fast-drying cellulose fabric. The time for complete evaporation of the water was measured to be 4 minutes and 10 seconds, with an average cooling effect of 4.8°C. After 10 washes, the cooling effect was measured again to be 4.6°C.

[0079] Example 7

[0080] (1) Spray a 1% hydrochloric acid solution evenly onto one side of the cellulose fabric and let it stand for 2 hours.

[0081] (2) Coat one side of the pretreated cellulose fabric evenly with octadecyltrichlorosilane, and wash the cellulose fabric with water after 1 hour.

[0082] (3) Prepare a 5% potassium hydroxide solution and immerse the washed cellulose fabric in it for 0.5 hours at a temperature of 25°C.

[0083] (4) After the reaction is complete, the cellulose fabric from step (3) is taken out and dried to obtain a cellulose fabric with rapid moisture transfer.

[0084] A drop of water (approximately 200 μl) was placed on the skin surface and covered with a fast-drying cellulose fabric. The time for complete evaporation of the water was measured to be 6 minutes, and the average cooling effect was 2.4℃. After 10 washes, the cooling effect was measured again to be 2.4℃.

[0085] Example 8

[0086] (1) Spray a 1% hydrochloric acid solution evenly onto one side of the cellulose fabric and let it stand for 2 hours.

[0087] (2) Coat one side of the pretreated cellulose fabric evenly with octadecyltrichlorosilane, and wash the cellulose fabric with water after 1 hour.

[0088] (3) Prepare a 5% potassium hydroxide solution, immerse the washed cellulose fabric in it for 0.5 hours at a temperature of 35°C.

[0089] (4) After the reaction is complete, the cellulose fabric from step (3) is taken out and dried to obtain a cellulose fabric with rapid moisture transfer.

[0090] A drop of water (approximately 200 μl) was placed on the skin surface and covered with a fast-drying cellulose fabric. The time for complete evaporation of the water was measured to be 5 minutes and 30 seconds, with an average cooling effect of 3.3°C. After 10 washes, the cooling effect was measured again to be 3.3°C.

[0091] Compare with Example 1

[0092] like Figure 4 As shown, when a drop of water (approximately 200 μl) was placed on the skin surface and an untreated virgin cellulose fabric was placed on top, the time for complete evaporation of the water was measured to be 10 minutes, and the average cooling effect was 1.2℃. Figure 5 After 10 washes, the cooling effect was measured again to be 1.1℃.

[0093] Compare with Example 2

[0094] (1) Spray a 10% phosphoric acid solution evenly onto one side of the cellulose fabric and let it stand for 4 hours at a temperature of 25°C.

[0095] (2) After the reaction is complete, remove the cellulose fabric and dry it.

[0096] A drop of water (approximately 200 μl) was placed on the skin surface and covered with a cellulose fabric. The time for complete evaporation of the water was measured to be 10 min 10 s, and the average cooling effect was 0.8℃. After 10 washes, the cooling effect was measured again to be 0.8℃.

[0097] Compare with Example 3

[0098] (1) Spray a 10% hydrochloric acid solution evenly onto one side of the cellulose fabric and let it stand for 4 hours at a temperature of 25°C.

[0099] (2) After the reaction is complete, remove the cellulose fabric and dry it.

[0100] A drop of water (approximately 200 μl) was placed on the skin surface and covered with cellulose fabric. The time for complete evaporation of the water was measured to be 10 minutes, and the average cooling effect was 0.9℃. After 10 washes, the cooling effect was measured again to be 0.9℃.

[0101] Compare with Example 4

[0102] (1) Coat one side of the cellulose fabric evenly with hexadecyltrimethoxysilane, and wash the cellulose with water after 4 hours at a temperature of 25°C.

[0103] (2) After the reaction is complete, remove the cellulose fabric and dry it.

[0104] A drop of water (approximately 200 μl) was placed on the skin surface and covered with a cellulose fabric. The time for complete evaporation of the water was measured to be 10 min 5 s, with an average cooling effect of 1.0℃. After 10 washes, the cooling effect was measured again to be 1.0℃.

[0105] Compare with Example 5

[0106] (1) Coat one side of the cellulose fabric evenly with octadecyltrichlorosilane, and wash the cellulose with water after 4 hours at a temperature of 25°C.

[0107] (2) After the reaction is complete, remove the cellulose fabric and dry it.

[0108] A drop of water (approximately 200 μl) was placed on the skin surface and covered with cellulose fabric. The time for complete evaporation of the water was measured to be 10 min 10 s, and the average cooling effect was 0.9℃. After 10 washes, the cooling effect was measured again to be 0.9℃.

[0109] Compare with Example 6

[0110] (1) Immerse the cellulose fabric in a 20% sodium hydroxide solution for 4 hours at a temperature of 25°C.

[0111] (2) After the reaction is complete, remove the cellulose fabric and dry it.

[0112] A drop of water (approximately 200 μl) was placed on the skin surface and covered with cellulose fabric. The time for complete evaporation of the water was measured to be 10 minutes, and the average cooling effect was 0.9℃. After 10 washes, the cooling effect was measured again to be 0.9℃.

[0113] Compare with Example 7

[0114] (1) Soak the cellulose fabric in a 20% potassium hydroxide solution for 4 hours at a temperature of 25°C.

[0115] (2) After the reaction is complete, remove the cellulose fabric and dry it.

[0116] A drop of water (approximately 200 μl) was placed on the skin surface and covered with a cellulose fabric. The time for complete evaporation of the water was measured to be 9 minutes and 55 seconds, with an average cooling effect of 1.1°C. After 10 washes, the cooling effect was measured again to be 1.1°C.

[0117] Compare with Example 8

[0118] (1) Spray a 10% acetic acid solution evenly onto one side of the cellulose fabric and let it stand for 4 hours at a temperature of 25°C.

[0119] (2) Then, the cellulose fabric is uniformly coated on one side with octadecyltrichlorosilane, and after 4 hours, the cellulose fabric is washed with water.

[0120] (3) After the reaction is complete, remove the cellulose fabric and dry it.

[0121] A drop of water (approximately 200 μl) was placed on the skin surface and covered with cellulose fabric. The time for complete evaporation of the water was measured to be 9 minutes, and the average cooling effect was 1.4℃. After 10 washes, the cooling effect was measured again to be 1.4℃.

Claims

1. A method for preparing a cellulose fabric capable of rapid moisture transfer, characterized in that: Includes the following steps: (1) Treat one side of the cellulose fabric with an acidic solution; (2) The acid-treated surface of the cellulose fabric is treated again with a silane reagent; the silane reagent is hexadecyltrimethoxysilane, octadecyltrimethoxysilane or octadecyltrichlorosilane; (3) Place the cellulose fabric treated in step (2) in an alkaline solution; the alkaline solution is KOH, NaOH or LiOH, and the concentration of the alkaline solution is 5 wt%-20 wt%. (4) Wash the cellulose fabric and dry it.

2. The method for preparing a rapidly water-transferring cellulose fabric according to claim 1, characterized in that: The acidic solution mentioned in step (1) is hydrochloric acid, phosphoric acid, or acetic acid.

3. The method for preparing a rapidly water-transporting cellulose fabric according to claim 1, characterized in that: The concentration of the acidic solution in step (1) is 0.5 wt%-10 wt%.

4. The method for preparing a rapidly water-transferring cellulose fabric according to claim 1, characterized in that: The processing time for step (1) is 0.5-4 hours.

5. The method for preparing a rapidly water-transporting cellulose fabric according to claim 1, characterized in that: The processing time for step (2) is 0.5-4 hours.

6. The method for preparing a rapidly water-transferring cellulose fabric according to claim 1, characterized in that: The soaking time of the alkaline solution in step (3) is 0.5-4 h, and the temperature is 20-40 ℃.

7. Cellulose fabric prepared by any one of claims 1-6.

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