High-strength nano-composite antibacterial fabric and preparation method thereof

Abstract

The invention discloses a high-strength nano-composite antibacterial fabric which comprises a base fabric and a modified and sol-gel nano layer, the modified and sol-gel nano layer and the base fabric are compounded and smeared to form the nano-composite antibacterial fabric, and the modified and sol-gel nano layer is coated with the modified and sol-gel nano layer to form the high-strength nano-composite antibacterial fabric. The modified sol-gel nano layer comprises titanium dioxide sol, nano zinc oxide and a silver antibacterial agent, the base layer fabric is prepared from the following raw materials in percentage by weight: 10% of chitin fiber, 50% of Coolplus fiber, 40% of cotton fiber and 16.7 tex of yarn linear density, and the base layer fabric is prepared from the following raw materials in percentage by weight: 10% of chitosan fiber, 50% of Coolplus fiber, 40% of cotton fiber and 16.7 tex of yarn linear density. Compared with the prior art, the fabric has the advantages that a layer of uniform and firm porous nano antibacterial film is formed on the surface of the fabric, so that staphylococcus aureus and pathogenic escherichia coli can be effectively killed; the double-layer fabric formed by combining the chitin fibers, the Coolplus fibers and the cotton fibers has good antibacterial, bacteriostatic, rapid moisture absorption and moisture conduction functions.

Description

Technical Field

[0001] This invention relates to the field of antibacterial fabric technology, specifically a high-strength nanocomposite antibacterial fabric and its preparation method. Background Technology

[0002] Fabrics are loved and used by a wide range of consumers, but current fabrics have drawbacks such as poor moisture absorption and breathability, discomfort when worn, and poor abrasion resistance. Furthermore, improper use or washing of synthetic fiber fabrics can cause them to be damaged to varying degrees.

[0003] Antibacterial modification of fabrics is a common method to inhibit the growth of bacteria, dust mites, and other microorganisms. However, commonly used antibacterial agents are not water-resistant, resulting in short-lasting antibacterial activity. In addition, modifying fabrics with these antibacterial agents often affects the fabric's performance, such as reduced moisture permeability and mechanical properties.

[0004] However, existing antibacterial fabrics cannot meet people's needs in terms of tensile strength, abrasion resistance, and breathability. Therefore, it is particularly important to improve the properties of fabrics while enhancing their antibacterial performance.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The technical problem to be solved by this invention is to overcome the above-mentioned technical defects and provide a high-strength nanocomposite antibacterial fabric and its preparation method.

[0007] To address the aforementioned problems, the present invention provides a high-strength nanocomposite antibacterial fabric, comprising a base fabric and a modified sol-gel nanolayer. The modified sol-gel nanolayer is composited with the base fabric and coated to form the nanocomposite antibacterial fabric. The modified sol-gel nanolayer comprises titanium dioxide sol, nano zinc oxide, and silver-based antibacterial agents. The base fabric comprises chitosan fiber, cotton fiber, and Coolplus fiber. The ratio of the base fabric raw materials is: 10% chitosan fiber, 50% Coolplus fiber, and 40% cotton fiber, with a yarn linear density of 16.7 tex.

[0008] As a preferred embodiment, the titanium dioxide sol is prepared as follows: nano-titanium dioxide sol is prepared by sol-gel method, using tetrabutyl titanate as raw material and glacial acetic acid as inhibitor, with the reactant ratio being: tetrabutyl titanate: ethanol: water: glacial acetic acid = 1:9:3:10.

[0009] As a preferred embodiment, the preparation method of the nano-zinc oxide is as follows: nano-ZnO is prepared by direct precipitation method, the concentration of zinc sulfate is 1.0 mol·L-1, the molar ratio of ammonium bicarbonate to zinc sulfate is 2:1, and the reaction is stirred at 80℃ for 2 h.

[0010] As a preferred embodiment, the silver-based antibacterial agent is prepared by immersing the carrier silica in a silver salt solution, stirring at 50°C for 2 hours, and then filtering and washing.

[0011] This application also discloses a method for preparing a high-strength nanocomposite antibacterial fabric, comprising the following steps: Step 1: Use chitosan and cotton blended yarn as the inner layer of the fabric and Coolplus staple fiber yarn as the outer layer of the fabric. Weave the two materials into a variable weft plain knit structure on two separate needle beds to form two unconnected pieces of fabric. Use tuck loops to connect the two unconnected pieces of fabric to form a double-layered fabric with two sides woven from the two materials respectively. Step 2: After combining nano zinc oxide and silver-based antibacterial agents, surface modification is performed using a titanate coupling agent. Then, the mixture is added to titanium dioxide sol and stirred for 24 hours. The mixture is then evenly coated onto the double-layer fabric from Step 1, forming a strong porous nano antibacterial film on the fabric surface. After drying, the nano composite antibacterial fabric is obtained.

[0012] The advantages of this invention compared to existing technologies are: 1. This invention employs nano-combination sterilization technology to fix nano-antibacterial materials with different antibacterial mechanisms into ordinary fabrics using a sol-gel composite process, forming a uniform and firm porous nano-antibacterial film on the fabric surface, which can effectively kill Staphylococcus aureus and pathogenic Escherichia coli; chitin fiber is a natural green health-care functional fiber processed using high-tech methods, possessing health-care functions such as sterilization, bacteriostasis, anti-inflammation, and wound healing promotion; Coolplus has a rapid moisture-wicking function, and the prepared double-layer fabric has excellent antibacterial, bacteriostasis, and rapid moisture absorption and wicking functions. Detailed Implementation

[0013] To make the content of this invention easier to understand, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Example

[0014] A high-strength nanocomposite antibacterial fabric includes a base fabric and a modified sol-gel nanolayer. The modified and sol-gel nanolayers are combined with the base fabric and applied to form the nanocomposite antibacterial fabric. The modified and sol-gel nanolayers include titanium dioxide sol, nano zinc oxide, and silver-based antibacterial agents. The base fabric is made of chitosan fiber, cotton fiber, and Coolplus fiber. The raw material ratio of the base fabric is: 10% chitosan fiber, 50% Coolplus fiber, and 40% cotton fiber, with a yarn linear density of 16.7 tex.

[0015] The preparation methods for titanium dioxide sol are as follows: Nano-titanium dioxide sol is prepared using the sol-gel method, with tetrabutyl titanate as the raw material and glacial acetic acid as the inhibitor. The reactant ratio is: tetrabutyl titanate: ethanol: water: glacial acetic acid = 1:9:3:10. The preparation methods for nano-zinc oxide are as follows: Nano-ZnO is prepared using the direct precipitation method. The concentration of zinc sulfate is 1.0 mol·L⁻¹, and the molar ratio of ammonium bicarbonate to zinc sulfate is 2:1. The reaction is carried out at 80℃ for 2 h with stirring. The preparation methods for silver-based antibacterial agents are as follows: Silver-based antibacterial agents are prepared by immersing the carrier silica in a silver salt solution, stirring at 50℃ for 2 h, and then filtering and washing.

[0016] A method for preparing a high-strength nanocomposite antibacterial fabric includes the following steps: Step 1: Use chitosan and cotton blended yarn as the inner layer of the fabric and Coolplus staple fiber yarn as the outer layer of the fabric. Weave the two materials into a variable weft plain knit structure on two separate needle beds to form two unconnected pieces of fabric. Use tuck loops to connect the two unconnected pieces of fabric to form a double-layered fabric with two sides woven from the two materials respectively. Step 2: After combining nano zinc oxide and silver-based antibacterial agents, surface modification is performed using a titanate coupling agent. Then, the mixture is added to titanium dioxide sol and stirred for 24 hours. The mixture is then evenly coated onto the double-layer fabric from Step 1, forming a strong porous nano antibacterial film on the fabric surface. After drying, the nano composite antibacterial fabric is obtained.

[0017] Comparative Example 1 A high-strength nanocomposite antibacterial fabric includes a base fabric and a modified sol-gel nanolayer. The modified sol-gel nanolayer is combined with the base fabric and applied to form the nanocomposite antibacterial fabric. The modified sol-gel nanolayer includes titanium dioxide sol and nano zinc oxide. The raw materials of the base fabric include chitosan fiber and cotton fiber. The ratio of the raw materials of the base fabric is: 40% chitosan fiber, 60% cotton fiber, and the yarn linear density is 16.7 tex.

[0018] A method for preparing a high-strength nanocomposite antibacterial fabric includes the following steps: Step 1: Use chitosan and cotton blended yarn as a single layer of the fabric; Step 2: Modify the surface of nano zinc oxide with a titanate coupling agent, then add it to titanium dioxide sol and stir for 24 hours. Then, evenly coat it onto the single-layer fabric from Step 1 to form a strong porous nano antibacterial film on the fabric surface. After drying, the nano composite antibacterial fabric is obtained.

[0019] Comparative Example 2 A high-strength nanocomposite antibacterial fabric includes a base fabric and a modified sol-gel nanolayer. The modified sol-gel nanolayer is combined with the base fabric and applied to form the nanocomposite antibacterial fabric. The modified sol-gel nanolayer includes titanium dioxide sol and silver-based antibacterial agents. The raw material of the base fabric includes Coolplus fiber with a yarn linear density of 16.7 tex.

[0020] A method for preparing a high-strength nanocomposite antibacterial fabric includes the following steps: Step 1: Use Coolplus short fiber yarn as a single layer of the fabric; Step 2: After combining nano zinc oxide and silver-based antibacterial agents, surface modification is performed using a titanate coupling agent. Then, the mixture is added to titanium dioxide sol and stirred for 24 hours. The mixture is then evenly coated onto the single-layer fabric from Step 1 to form a strong porous nano antibacterial film on the fabric surface. After drying, the nano composite antibacterial fabric is obtained.

[0021] Antibacterial test The target bacteria were Staphylococcus aureus and pathogenic Escherichia coli. The antimicrobial fabric was tested together with the blank sample (containing no antimicrobial agent). The antimicrobial test procedure is as follows.

[0022] The antibacterial fabric to be tested was cut into small round pieces with a diameter of 6 mm, sterilized with ultraviolet light, and placed in a sterile container. Purified Staphylococcus aureus and pathogenic Escherichia coli were inoculated into ordinary nutrient broth and incubated at 37°C for 12 hours. The bacterial solution was then diluted according to a certain ratio. The diluted bacterial solution was evenly spread on ordinary nutrient agar plates, and then the sterilized fabric round pieces were placed on the plates. The plates were covered and incubated at 37°C for 24 hours. The diameter of the inhibition zone was measured using calipers.

[0023] In conclusion, the antibacterial fabric of Example 1 has the strongest antibacterial effect.

[0024] Tensile strength test The tensile strength was tested according to the international standard ISO 13937-1:2004 "Textiles—Tests for tear strength—Part 1: Test methods for tear strength testing machines". During the test, the fabric sample was fixed on the tensile testing machine and stretched at a certain tensile speed until the sample broke. The maximum tensile force at break was recorded.

[0025] Elastic modulus test The elastic modulus was tested according to ISO 37-1:2004 "Textiles—Tests for elastic modulus—Part 1: Test methods using a tensile testing machine". The fabric sample was fixed on the tensile testing machine and stretched at a certain stretching speed. The stress value at a specific elongation was recorded, and the elastic modulus was calculated.

[0026] Breathability test Air permeability testing was conducted according to GB / T5453-1997 "Test Method for Air Permeability of Textiles". The fabric sample was placed on an air permeability tester, and the gas flow rate through the sample per unit time was measured under a certain pressure to obtain the air permeability index.

[0027] Flame retardancy test Flame retardancy was tested according to GB / T8323-2007 "Test Methods for Burning Performance of Textiles". The fabric sample was placed on a burning tester, one end was ignited, and the burning time, burning length, and other indicators were recorded.

[0028] Abrasion resistance test Abrasion resistance was tested according to ISO 105-X12:2003, "Textiles - Tests for abrasion resistance". The fabric sample was placed on an abrasion tester and rubbed under a certain pressure and speed. The number of rubbing cycles was recorded until the sample broke.

[0029] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if anyone skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the spirit of the invention, such design should fall within the protection scope of the present invention.

Claims

1. A high-strength nanocomposite antibacterial fabric, characterized in that, The fabric comprises a base fabric and a modified sol-gel nanolayer. The modified sol-gel nanolayer is combined with the base fabric and applied to form a nanocomposite antibacterial fabric. The modified sol-gel nanolayer includes titanium dioxide sol, nano zinc oxide, and silver-based antibacterial agents. The base fabric is made of chitosan fiber, cotton fiber, and Coolplus fiber. The raw materials of the base fabric are: 10% chitosan fiber, 50% Coolplus fiber, and 40% cotton fiber, with a yarn linear density of 16.7 tex.

2. The high-strength nanocomposite antibacterial fabric according to claim 1, characterized in that: The preparation method of the titanium dioxide sol is as follows: nano titanium dioxide sol is prepared by sol-gel method, using tetrabutyl titanate as raw material and glacial acetic acid as inhibitor, and the reactant ratio is: tetrabutyl titanate: ethanol: water: glacial acetic acid = 1:9:3:

10.

3. The high-strength nanocomposite antibacterial fabric according to claim 1, characterized in that: The preparation method of the nano-zinc oxide is as follows: nano-ZnO is prepared by direct precipitation method, and the concentration of zinc sulfate is 1.0 mol·L⁻¹. -1 The molar ratio of ammonium bicarbonate to zinc sulfate was 2:1, and the mixture was stirred at 80°C for 2 hours.

4. The high-strength nanocomposite antibacterial fabric according to claim 1, characterized in that: The silver-based antibacterial agent is prepared by immersing the carrier silica in a silver salt solution, stirring at 50°C for 2 hours, and then filtering and washing.

5. The method for preparing a high-strength nanocomposite antibacterial fabric according to claim 1, characterized in that: Includes the following steps: Step 1: Use chitosan and cotton blended yarn as the inner layer of the fabric and Coolplus staple fiber yarn as the outer layer of the fabric. Weave the two materials into a variable weft plain knit structure on two separate needle beds to form two unconnected pieces of fabric. Use tuck loops to connect the two unconnected pieces of fabric to form a double-layered fabric with two sides woven from the two materials respectively. Step 2: After combining nano zinc oxide and silver-based antibacterial agents, surface modification is performed using a titanate coupling agent. Then, the mixture is added to titanium dioxide sol and stirred for 24 hours. The mixture is then evenly coated onto the double-layer fabric from Step 1, forming a strong porous nano antibacterial film on the fabric surface. After drying, the nano composite antibacterial fabric is obtained.