High permeability composite nonwoven fabric and process for making same
By coating the surface of nonwoven fabric with casting solution and modified nano-titanium oxide, a highly permeable composite nonwoven fabric was prepared, which solved the problems of insufficient hydrophilicity and permeability of traditional nonwoven fabrics and improved the high permeability and antibacterial properties of the material.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JIANGSU HUALONG NON WOVEN
- Filing Date
- 2025-01-08
- Publication Date
- 2026-08-04
AI Technical Summary
Traditional nonwoven materials have poor hydrophilicity and permeability, which limits their use in certain specific applications, especially in the medical and environmental protection fields.
A highly permeable composite nonwoven fabric was prepared by coating the surface of the nonwoven fabric with a casting solution, combined with modified nano-titanium oxide and silver fiber. The casting solution contains components such as poly-L-lysine, which form hydrogen bonds and covalent bonds to improve hydrophilicity, while nano-titanium oxide improves dispersibility and antibacterial properties.
It significantly improves the permeability and antibacterial properties of nonwoven fabrics, while also enhancing the mechanical properties of the material.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] This invention relates to the field of nonwoven fabric processing technology, specifically to a high-permeability composite nonwoven fabric and its processing technology. Background Technology
[0002] In modern society, nonwoven fabrics, as a novel textile material, have attracted widespread attention due to their superior physical properties, efficient production processes, and cost-effectiveness. The applications of nonwoven fabrics are very broad, ranging from agricultural coverings, hygiene products, and industrial fabrics to disposable surgical gowns in the medical field. However, traditional nonwoven fabrics are usually made of synthetic polymers, such as polypropylene and polyester. While these materials offer good performance, they often have poor hydrophilicity and permeability, limiting their use in certain specific applications. Furthermore, with technological advancements and increased environmental awareness, the market demand for high-performance nonwoven fabrics is growing, especially those with high permeability, excellent liquid transport capabilities, and good biocompatibility. These properties are crucial for improving the effectiveness of nonwoven fabrics in medical, hygiene, and environmental protection applications. Therefore, the preparation of a highly permeable composite nonwoven fabric is of great significance. Summary of the Invention
[0003] The purpose of this invention is to provide a high-permeability composite nonwoven fabric and its processing technology to solve the problems raised in the prior art.
[0004] To achieve the above objectives, the present invention provides the following technical solution: A processing technology for a high-permeability composite nonwoven fabric includes the following steps: Step 1: Coat the surface of the nonwoven fabric with casting solution to obtain a hydrophilic nonwoven fabric layer; blend acrylic fiber and silver fiber in a mass ratio of (50-60):1 to obtain an antibacterial mesh layer; melt-extrude polypropylene and compress and shape it to obtain a hydrophobic nonwoven fabric layer. Step 2: Stack the hydrophilic nonwoven fabric layer, antibacterial mesh layer, and hydrophobic nonwoven fabric layer from top to bottom, and then needle-punch and cure them to obtain a highly permeable composite nonwoven fabric.
[0005] In a more optimized manner, the preparation process of the hydrophilic nonwoven fabric layer is as follows: S1: Polyamide fibers and polyester fibers are carded into a web, hot-air bonded, then hot-rolled and cooled to form nonwoven fabric A; S2: Plasma treatment is performed on nonwoven fabric A to obtain the initial nonwoven fabric product; S3: The casting solution is evenly coated on the surface of the nonwoven fabric sample, then immersed in an ethanol solution for 30-40 minutes, and dried to obtain a hydrophilic nonwoven fabric layer.
[0006] More optimally, the casting solution comprises the following components: by weight, 5-8 parts poly-L-lysine, 3-5 parts glutaraldehyde, 10-12 parts polyvinyl alcohol, 4-5 parts acetic acid, and 1-2 parts modified nano-titanium oxide.
[0007] In a more optimized manner, the preparation process of the modified nano-titanium oxide is as follows: (1) Add nano-titanium oxide and γ-aminopropyltriethoxysilane sequentially to a 10-20wt% aqueous ethanol solution, heat to 70-80℃, stir for 4-5h, wash, and dry to obtain aminated nano-titanium oxide. (2) Mix amino-modified nano-titanium oxide, 2-2-(bromoacetyl)benzoic acid and dimethyl sulfoxide, stir for 30-40 min, then add dicyclohexylcarbodiimide and N-hydroxysuccinimide, continue stirring for 10-12 min, heat to 40-50℃, react for 5-8 h to obtain the intermediate; (3) Mix the intermediate, tetrahydrofuran and triethylamine, stir for 30-40 min, add N-butyl-m-toluidine dropwise under a protective atmosphere, heat to 60-70℃, react for 3-4 h, cool to room temperature, wash and dry to obtain modified nano-titanium oxide.
[0008] More preferably: the aminated nano-titanium oxide comprises the following components: by weight, 20-25 parts nano-titanium oxide, 100-150 parts aqueous ethanol solution, and 8-10 parts γ-aminopropyltriethoxysilane; the intermediate comprises the following components: by weight, 30-35 parts aminated nano-titanium oxide, 10-12 parts 2,2-(bromoacetyl)benzoic acid, 200-250 parts dimethyl sulfoxide, 0.5-0.7 parts dicyclohexylcarbodiimide, and 0.8-1 parts N-hydroxysuccinimide; the modified nano-titanium oxide comprises the following components: by weight, 10-15 parts intermediate, 80-100 parts tetrahydrofuran, 3-4 parts triethylamine, and 6-8 parts N-butyl-m-toluidine.
[0009] In a more optimized manner: the mass ratio of polyamide fiber to polyester fiber in the nonwoven fabric A is (2-3):1; the hot rolling temperature is 100-120℃; and the cooling forming temperature is 15-20℃.
[0010] The optimal parameters for plasma treatment are: power 50-60W, time 3-9min, and oxygen flux 50-80mL / min.
[0011] In a more optimized manner, the preparation process of the hydrophobic nonwoven fabric layer is as follows: polypropylene and modified nano-titanium oxide are melt-extruded at 220-230℃, cooled, and then compressed and shaped at a temperature of 150-160℃ and a pressure of 4-5Kg to obtain the hydrophobic nonwoven fabric layer.
[0012] In a more optimized manner, the hydrophobic nonwoven fabric layer comprises the following components: 100-120 parts by weight of polypropylene and 5-6 parts by weight of modified nano-titanium oxide.
[0013] This invention improves the hydrophilicity of the hydrophilic nonwoven fabric layer by designing the structure of the composite nonwoven fabric, effectively enhancing the overall permeability of the material. Simultaneously, modification of nano-titanium oxide improves the antibacterial effect and mechanical properties of the material. Details are as follows: Firstly, the hydrophilic nonwoven fabric layer is obtained by coating the surface of the nonwoven fabric raw material with a casting solution. In the casting solution, poly-L-lysine contains a large number of amino and amide groups. These functional groups can form hydrogen bonds with water molecules, thereby improving the hydrophilicity and permeability of the material. At the same time, the amino groups in the molecules can be protonated in the solution to form cations, which improves the antibacterial properties of the material. In the presence of glutaraldehyde, covalent bonds are formed through Schiff base reaction, which improves the wash durability of the coating. Secondly, nano-titanium oxide is added to both the casting solution and the hydrophobic nonwoven fabric layer. Since nano-titanium oxide tends to aggregate in solution, this invention modifies its surface with quaternization and introduces longer molecular chains, effectively improving its dispersibility in solution. Simultaneously, the quaternization groups on the surface also effectively enhance the overall antibacterial properties. Furthermore, as a reinforcing material, nano-titanium oxide also improves the mechanical properties of the composite nonwoven fabric. Detailed Implementation
[0014] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0015] It should be noted that the following parts are by weight. There are no special restrictions on the purchasers of any of the raw materials involved in this invention. Exemplary examples include: 2-2-(bromoacetyl)benzoic acid, CAS number 7399-67-9, purchased from Shanghai Huayuan Century Trading Co., Ltd.; N-butyl-m-toluidine, CAS number 60995-75-7; and poly-L-lysine, catalog number 60716ES08.
[0016] Example 1: A processing technology for a high-permeability composite nonwoven fabric, comprising the following steps: Step 1: The preparation process of the hydrophilic nonwoven fabric layer is as follows: S1: Polyamide fibers and polyester fibers are carded into a web, hot-air bonded, then hot-rolled at 100°C, and cooled and shaped at 15°C to obtain nonwoven fabric A; S2: Plasma treatment is performed on nonwoven fabric A. The plasma parameters are: power 50W, time 3min, oxygen flux 50mL / min, to obtain the initial nonwoven fabric product. S3: The casting solution is evenly coated onto the surface of the initial nonwoven fabric sample, then immersed in an ethanol solution for 30 minutes, and dried to obtain a hydrophilic nonwoven fabric layer. The casting solution comprises the following components: by weight, 5 parts poly-L-lysine, 3 parts glutaraldehyde, 10 parts polyvinyl alcohol, 4 parts acetic acid, and 1 part modified nano-titanium oxide. The preparation process of the modified nano-titanium oxide is as follows: (1) Mix 20 parts of nano-titanium oxide, 100 parts of 10wt% ethanol aqueous solution and 8 parts of γ-aminopropyltriethoxysilane, heat to 70℃, stir for 4h, wash and dry to obtain aminated nano-titanium oxide; (2) Mix 30 parts of aminated nano-titanium oxide, 10 parts of 2-2(bromoacetyl)benzoic acid and 200 parts of dimethyl sulfoxide, stir for 30 min, then add 0.5 parts of dicyclohexylcarbodiimide and 0.8 parts of N-hydroxysuccinimide, continue stirring for 10 min, heat to 40℃, react for 5 h to obtain the intermediate; (3) Mix 10 parts of intermediate, 80 parts of tetrahydrofuran and 3 parts of triethylamine, stir for 30 min, add 6 parts of N-butyl-m-toluidine under nitrogen, heat to 60 °C, react for 3 h, cool to room temperature, wash and dry to obtain modified nano-titanium oxide.
[0017] Preparation of antibacterial mesh layer: Acrylic fiber and silver fiber are blended in a mass ratio of 50:1 to obtain antibacterial mesh layer.
[0018] The preparation process of the hydrophobic nonwoven fabric layer is as follows: polypropylene and modified nano titanium oxide are melt-extruded at 220℃, cooled, and then compressed and shaped at 150℃ and 4Kg pressure to obtain the hydrophobic nonwoven fabric.
[0019] Step 2: Stack the hydrophilic nonwoven fabric layer, antibacterial mesh layer, and hydrophobic nonwoven fabric layer from top to bottom, and then needle-punch and cure them to obtain a highly permeable composite nonwoven fabric.
[0020] Example 2: A processing technology for a high-permeability composite nonwoven fabric, comprising the following steps: Step 1: The preparation process of the hydrophilic nonwoven fabric layer is as follows: S1: Polyamide fibers and polyester fibers are carded into a web, hot-air bonded, then hot-rolled at 120°C, and cooled and shaped at 20°C to obtain nonwoven fabric A; S2: Plasma treatment is performed on nonwoven fabric A. The plasma parameters are: power 60W, time 9min, oxygen flux 80mL / min, to obtain the initial nonwoven fabric product. S3: The casting solution is evenly coated onto the surface of the initial nonwoven fabric sample, then immersed in an ethanol solution for 40 minutes, and dried to obtain a hydrophilic nonwoven fabric layer. The casting solution comprises the following components: by weight, 8 parts poly-L-lysine, 5 parts glutaraldehyde, 12 parts polyvinyl alcohol, 5 parts acetic acid, and 2 parts modified nano-titanium oxide. The preparation process of the modified nano-titanium oxide is as follows: (1) Mix 25 parts of nano-titanium oxide, 150 parts of 20wt% ethanol aqueous solution and 10 parts of γ-aminopropyltriethoxysilane, heat to 80℃, stir for 5h, wash and dry to obtain aminated nano-titanium oxide. (2) Mix 35 parts of aminated nano-titanium oxide, 12 parts of 2-2(bromoacetyl)benzoic acid and 250 parts of dimethyl sulfoxide, stir for 40 min, then add 0.7 parts of dicyclohexylcarbodiimide and 1 part of N-hydroxysuccinimide, continue stirring for 12 min, heat to 50 °C, react for 8 h to obtain the intermediate; (3) Mix 15 parts of intermediate, 100 parts of tetrahydrofuran and 4 parts of triethylamine, stir for 40 min, add 8 parts of N-butyl-m-toluidine under nitrogen, heat to 70 °C, react for 4 h, cool to room temperature, wash and dry to obtain modified nano-titanium oxide.
[0021] The preparation process of the antibacterial mesh layer is as follows: acrylic fiber and silver fiber are blended in a mass ratio of 50:1 to obtain the antibacterial mesh layer.
[0022] The preparation process of the hydrophobic nonwoven fabric layer is as follows: polypropylene and modified nano titanium oxide are melt-extruded at 230℃, cooled, and then compressed and shaped at 160℃ and 5Kg pressure to obtain the hydrophobic nonwoven fabric layer.
[0023] Step 2: Stack the hydrophilic nonwoven fabric layer, antibacterial mesh layer, and hydrophobic nonwoven fabric layer from top to bottom, and then needle-punch and cure them to obtain a highly permeable composite nonwoven fabric.
[0024] Example 3: A processing technology for a high-permeability composite nonwoven fabric, comprising the following steps: Step 1: The preparation process of the hydrophilic nonwoven fabric layer is as follows: S1: Polyamide fibers and polyester fibers are carded into a web, hot-air bonded, then hot-rolled at 110°C, and cooled and shaped at 18°C to obtain nonwoven fabric A; S2: Plasma treatment is performed on nonwoven fabric A. The plasma parameters are: power 55W, time 5min, oxygen flux 60mL / min, to obtain the initial nonwoven fabric product. S3: The casting solution is evenly coated onto the surface of the initial nonwoven fabric sample, then immersed in an ethanol solution for 35 minutes, and dried to obtain a hydrophilic nonwoven fabric layer. The casting solution comprises the following components: by weight, 6 parts poly-L-lysine, 4 parts glutaraldehyde, 11 parts polyvinyl alcohol, 4.5 parts acetic acid, and 1.5 parts modified nano-titanium oxide. The preparation process of the modified nano-titanium oxide is as follows: (1) Mix 22 parts of nano-titanium oxide, 120 parts of 15wt% ethanol aqueous solution and 9 parts of γ-aminopropyltriethoxysilane, heat to 75℃, stir for 4.5h, wash and dry to obtain aminated nano-titanium oxide; (2) Mix 32 parts of aminated nano-titanium oxide, 11 parts of 2-2(bromoacetyl)benzoic acid and 220 parts of dimethyl sulfoxide, stir for 35 min, then add 0.6 parts of dicyclohexylcarbodiimide and 0.9 parts of N-hydroxysuccinimide, continue stirring for 11 min, heat to 45℃, react for 6 h to obtain the intermediate; (3) Mix 12 parts of intermediate, 90 parts of tetrahydrofuran and 3.5 parts of triethylamine, stir for 35 min, add 7 parts of N-butyl-m-toluidine under nitrogen, heat to 65 °C, react for 3.5 h, cool to room temperature, wash and dry to obtain modified nano titanium dioxide.
[0025] The preparation process of the antibacterial mesh layer is as follows: acrylic fiber and silver fiber are blended in a mass ratio of 50:1 to obtain the antibacterial mesh layer.
[0026] The preparation process of the hydrophobic nonwoven fabric layer is as follows: polypropylene and modified nano titanium oxide are melt-extruded at 225℃, cooled, and then compressed and shaped at 155℃ and 4.5Kg pressure to obtain the hydrophobic nonwoven fabric layer.
[0027] Step 2: Stack the hydrophilic nonwoven fabric layer, antibacterial mesh layer, and hydrophobic nonwoven fabric layer from top to bottom, and then needle-punch and cure them to obtain a highly permeable composite nonwoven fabric.
[0028] Comparative Example 1: No modified nano-titanium oxide was added during the preparation of the composite nonwoven fabric; the rest was the same as in Example 3, as follows: Step 1: The preparation process of the hydrophilic nonwoven fabric layer is as follows: S1: Polyamide fibers and polyester fibers are carded into a web, hot-air bonded, then hot-rolled at 110°C, and cooled and shaped at 18°C to obtain nonwoven fabric A; S2: Plasma treatment is performed on nonwoven fabric A. The plasma parameters are: power 55W, time 5min, oxygen flux 60mL / min, to obtain the initial nonwoven fabric product. S3: The casting solution is evenly coated onto the surface of the nonwoven fabric sample, then immersed in an ethanol solution for 35 minutes, and dried to obtain a hydrophilic nonwoven fabric layer. The casting solution includes the following components: by weight, 6 parts poly-L-lysine, 4 parts glutaraldehyde, 11 parts polyvinyl alcohol, and 4.5 parts acetic acid.
[0029] The preparation process of the antibacterial mesh layer is as follows: acrylic fiber and silver fiber are blended in a mass ratio of 50:1 to obtain the antibacterial mesh layer.
[0030] The preparation process of the hydrophobic nonwoven fabric layer is as follows: polypropylene is melt-extruded at 200℃, cooled, and then compressed and shaped at a temperature of 155℃ and a pressure of 4.5Kg to obtain the hydrophobic nonwoven fabric layer.
[0031] Step 2: Stack the hydrophilic nonwoven fabric layer, antibacterial mesh layer, and hydrophobic nonwoven fabric layer from top to bottom, and then needle-punch and cure them to obtain a highly permeable composite nonwoven fabric.
[0032] Comparative Example 2: Poly-L-lysine was not added to the casting solution; otherwise, it was the same as in Example 3, as follows: Step 1: The preparation process of the hydrophilic nonwoven fabric layer is as follows: S1: Polyamide fibers and polyester fibers are carded into a web, hot-air bonded, then hot-rolled at 110°C, and cooled and shaped at 18°C to obtain nonwoven fabric A; S2: Plasma treatment is performed on nonwoven fabric A. The plasma parameters are: power 55W, time 5min, oxygen flux 60mL / min, to obtain the initial nonwoven fabric product. S3: The casting solution is evenly coated onto the surface of the initial nonwoven fabric sample, then immersed in an ethanol solution for 35 minutes, and dried to obtain a hydrophilic nonwoven fabric layer. The casting solution comprises the following components: by weight, 4 parts glutaraldehyde, 11 parts polyvinyl alcohol, 4.5 parts acetic acid, and 1.5 parts modified nano-titanium oxide. The preparation process of the modified nano-titanium oxide is as follows: (1) Mix 22 parts of nano-titanium oxide, 120 parts of 15wt% ethanol aqueous solution and 9 parts of γ-aminopropyltriethoxysilane, heat to 75℃, stir for 4.5h, wash and dry to obtain aminated nano-titanium oxide; (2) Mix 32 parts of aminated nano-titanium oxide, 11 parts of 2-2(bromoacetyl)benzoic acid and 220 parts of dimethyl sulfoxide, stir for 35 min, then add 0.6 parts of dicyclohexylcarbodiimide and 0.9 parts of N-hydroxysuccinimide, continue stirring for 11 min, heat to 45℃, react for 6 h to obtain the intermediate; (3) Mix 12 parts of intermediate, 90 parts of tetrahydrofuran and 3.5 parts of triethylamine, stir for 35 min, add 7 parts of N-butyl-m-toluidine under nitrogen, heat to 65 °C, react for 3.5 h, cool to room temperature, wash and dry to obtain modified nano titanium dioxide.
[0033] The preparation process of the antibacterial mesh layer is as follows: acrylic fiber and silver fiber are blended in a mass ratio of 50:1 to obtain the antibacterial mesh layer.
[0034] The preparation process of the hydrophobic nonwoven fabric layer is as follows: polypropylene and modified nano titanium oxide are melt-extruded at 225℃, cooled, and then compressed and shaped at 155℃ and 4.5Kg pressure to obtain the hydrophobic nonwoven fabric layer.
[0035] Step 2: Stack the hydrophilic nonwoven fabric layer, antibacterial mesh layer, and hydrophobic nonwoven fabric layer from top to bottom, and then needle-punch and cure them to obtain a highly permeable composite nonwoven fabric.
[0036] Comparative Example 3: Polyvinyl alcohol and acetic acid were not added to the casting solution, but the rest was the same as in Example 3, as follows: Step 1: The preparation process of the hydrophilic nonwoven fabric layer is as follows: S1: Polyamide fibers and polyester fibers are carded into a web, hot-air bonded, then hot-rolled at 110°C, and cooled and shaped at 18°C to obtain nonwoven fabric A; S2: Plasma treatment is performed on nonwoven fabric A. The plasma parameters are: power 55W, time 5min, oxygen flux 60mL / min, to obtain the initial nonwoven fabric product. S3: The casting solution is evenly coated onto the surface of the initial nonwoven fabric sample, then immersed in an ethanol solution for 35 minutes, and dried to obtain a hydrophilic nonwoven fabric layer. The casting solution comprises the following components: by weight, 6 parts poly-L-lysine, 4 parts glutaraldehyde, and 1.5 parts modified nano-titanium oxide. The preparation process of the modified nano-titanium oxide is as follows: (1) Mix 22 parts of nano-titanium oxide, 120 parts of 15wt% ethanol aqueous solution and 9 parts of γ-aminopropyltriethoxysilane, heat to 75℃, stir for 4.5h, wash and dry to obtain aminated nano-titanium oxide; (2) Mix 32 parts of aminated nano-titanium oxide, 11 parts of 2-2(bromoacetyl)benzoic acid and 220 parts of dimethyl sulfoxide, stir for 35 min, then add 0.6 parts of dicyclohexylcarbodiimide and 0.9 parts of N-hydroxysuccinimide, continue stirring for 11 min, heat to 45℃, react for 6 h to obtain the intermediate; (3) Mix 12 parts of intermediate, 90 parts of tetrahydrofuran and 3.5 parts of triethylamine, stir for 35 min, add 7 parts of N-butyl-m-toluidine under nitrogen, heat to 65 °C, react for 3.5 h, cool to room temperature, wash and dry to obtain modified nano titanium dioxide.
[0037] The preparation process of the antibacterial mesh layer is as follows: acrylic fiber and silver fiber are blended in a mass ratio of 50:1 to obtain the antibacterial mesh layer.
[0038] The preparation process of the hydrophobic nonwoven fabric layer is as follows: polypropylene and modified nano titanium oxide are melt-extruded at 225℃, cooled, and then compressed and shaped at 155℃ and 4.5Kg pressure to obtain the hydrophobic nonwoven fabric layer.
[0039] Step 2: Stack the hydrophilic nonwoven fabric layer, antibacterial mesh layer, and hydrophobic nonwoven fabric layer from top to bottom, and then needle-punch and cure them to obtain a highly permeable composite nonwoven fabric.
[0040] Comparative Example 4: In the preparation of the hydrophilic nonwoven fabric layer, no plasma treatment was performed, and the rest was the same as in Example 3, as detailed below: Step 1: The preparation process of the hydrophilic nonwoven fabric layer is as follows: S1: Polyamide fibers and polyester fibers are combed into a web, hot-air bonded, then hot-rolled at 110°C, and cooled and shaped at 18°C to obtain the initial nonwoven fabric. S2: The casting solution is evenly coated onto the surface of the initial nonwoven fabric sample, then immersed in an ethanol solution for 35 minutes, and dried to obtain a hydrophilic nonwoven fabric layer. The casting solution comprises the following components: by weight, 6 parts poly-L-lysine, 4 parts glutaraldehyde, 11 parts polyvinyl alcohol, 4.5 parts acetic acid, and 1.5 parts modified nano-titanium oxide. The preparation process of the modified nano-titanium oxide is as follows: (1) Mix 22 parts of nano-titanium oxide, 120 parts of 15wt% ethanol aqueous solution and 9 parts of γ-aminopropyltriethoxysilane, heat to 75℃, stir for 4.5h, wash and dry to obtain aminated nano-titanium oxide; (2) Mix 32 parts of aminated nano-titanium oxide, 11 parts of 2-2(bromoacetyl)benzoic acid and 220 parts of dimethyl sulfoxide, stir for 35 min, then add 0.6 parts of dicyclohexylcarbodiimide and 0.9 parts of N-hydroxysuccinimide, continue stirring for 11 min, heat to 45℃, react for 6 h to obtain the intermediate; (3) Mix 12 parts of intermediate, 90 parts of tetrahydrofuran and 3.5 parts of triethylamine, stir for 35 min, add 7 parts of N-butyl-m-toluidine under nitrogen, heat to 65 °C, react for 3.5 h, cool to room temperature, wash and dry to obtain modified nano titanium dioxide.
[0041] The preparation process of the antibacterial mesh layer is as follows: acrylic fiber and silver fiber are blended in a mass ratio of 50:1 to obtain the antibacterial mesh layer.
[0042] The preparation process of the hydrophobic nonwoven fabric layer is as follows: polypropylene and modified nano titanium oxide are melt-extruded at 225℃, cooled, and then compressed and shaped at 155℃ and 4.5Kg pressure to obtain the hydrophobic nonwoven fabric layer.
[0043] Step 2: Stack the hydrophilic nonwoven fabric layer, antibacterial mesh layer, and hydrophobic nonwoven fabric layer from top to bottom, and then needle-punch and cure them to obtain a highly permeable composite nonwoven fabric.
[0044] Performance testing: The composite nonwoven fabrics obtained in Examples 1-3 and Comparative Examples 1-4 were subjected to water penetration testing using an electrical method, tensile property testing, and antibacterial rate testing according to GB-T / 20944.3 standard. The results are shown in the table below:
[0045] Table 1 Conclusion: Examples 1-3 improved the hydrophilicity of the hydrophilic nonwoven fabric layer by designing the structure of the composite nonwoven fabric, effectively enhancing the overall permeability of the material. Simultaneously, modification of nano-titanium oxide improved the antibacterial effect and mechanical properties of the material. In Comparative Example 1, the absence of modified nano-titanium oxide during the composite nonwoven fabric preparation process reduced the antibacterial and mechanical properties of the material. In Comparative Example 2, the absence of poly-L-lysine in the casting solution reduced the permeability and antibacterial properties of the composite nonwoven fabric. In Comparative Example 3, the absence of polyvinyl alcohol and acetic acid in the casting solution reduced the hydrophilicity of the hydrophilic nonwoven fabric layer, thus decreasing the overall permeability of the material. In Comparative Example 4, the absence of plasma treatment during the preparation of the hydrophilic nonwoven fabric layer reduced the coating effect of the casting solution, further decreasing the hydrophilicity and performance of the hydrophilic nonwoven fabric layer.
[0046] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A processing technology for a high-permeability composite nonwoven fabric, characterized in that: Includes the following steps: Step 1: Coat the surface of the nonwoven fabric with casting solution to obtain a hydrophilic nonwoven fabric layer; blend acrylic fiber and silver fiber in a mass ratio of (50-60):1 to obtain an antibacterial mesh layer; melt-extrude polypropylene and modified nano titanium dioxide, compress and shape to obtain a hydrophobic nonwoven fabric layer. Step 2: Stack the hydrophilic nonwoven fabric layer, antibacterial mesh layer, and hydrophobic nonwoven fabric layer from top to bottom, and then needle-punch and cure them to obtain a high-permeability composite nonwoven fabric; The preparation process of the hydrophilic nonwoven fabric layer is as follows: S1: Polyamide fibers and polyester fibers are carded into a web, hot-air bonded, then hot-rolled and cooled to form nonwoven fabric A; S2: Plasma treatment is performed on nonwoven fabric A to obtain the initial nonwoven fabric product; S3: The casting solution is evenly coated on the surface of the nonwoven fabric sample, then immersed in ethanol solution for 30-40 minutes, and dried to obtain a hydrophilic nonwoven fabric layer. The casting solution comprises the following components by weight: 5-8 parts poly-L-lysine, 3-5 parts glutaraldehyde, 10-12 parts polyvinyl alcohol, 4-5 parts acetic acid, and 1-2 parts modified nano-titanium oxide. The preparation process of the modified nano-titanium oxide is as follows: (1) Add nano-titanium oxide and γ-aminopropyltriethoxysilane sequentially to a 10-20wt% aqueous ethanol solution, heat to 70-80℃, stir for 4-5h, wash, and dry to obtain aminated nano-titanium oxide. (2) Mix amino-modified nano-titanium oxide, 2-2-(bromoacetyl)benzoic acid and dimethyl sulfoxide, stir for 30-40 min, then add dicyclohexylcarbodiimide and N-hydroxysuccinimide, continue stirring for 10-12 min, heat to 40-50℃, react for 5-8 h to obtain the intermediate; (3) Mix the intermediate, tetrahydrofuran and triethylamine, stir for 30-40 min, add N-butyl-m-toluidine dropwise under a protective atmosphere, heat to 60-70℃, react for 3-4 h, cool to room temperature, wash and dry to obtain modified nano-titanium oxide.
2. The processing technology for a high-permeability composite nonwoven fabric according to claim 1, characterized in that: The raw materials for the aminated nano-titanium oxide include the following components: by weight, 20-25 parts nano-titanium oxide, 100-150 parts aqueous ethanol solution, and 8-10 parts γ-aminopropyltriethoxysilane; the raw materials for the intermediate include the following components: by weight, 30-35 parts aminated nano-titanium oxide, 10-12 parts 2,2-(bromoacetyl)benzoic acid, 200-250 parts dimethyl sulfoxide, 0.5-0.7 parts dicyclohexylcarbodiimide, and 0.8-1 parts N-hydroxysuccinimide; the raw materials for the modified nano-titanium oxide include the following components: by weight, 10-15 parts intermediate, 80-100 parts tetrahydrofuran, 3-4 parts triethylamine, and 6-8 parts N-butyl-m-toluidine.
3. The processing technology for a high-permeability composite nonwoven fabric according to claim 1, characterized in that: In the nonwoven fabric A, the mass ratio of polyamide fiber to polyester fiber is (2-3):1; the hot rolling temperature is 100-120℃; and the cooling forming temperature is 15-20℃.
4. The processing technology for a high-permeability composite nonwoven fabric according to claim 1, characterized in that: The parameters for plasma treatment are: power 50-60W, time 3-9min, and oxygen flux 50-80mL / min.
5. The processing technology for a high-permeability composite nonwoven fabric according to claim 1, characterized in that: The preparation process of the hydrophobic nonwoven fabric layer is as follows: polypropylene and modified nano titanium oxide are melt-extruded at 220-230℃, cooled, and then compressed and shaped at 150-160℃ to obtain the hydrophobic nonwoven fabric layer.
6. The processing technology for a high-permeability composite nonwoven fabric according to claim 5, characterized in that: The hydrophobic nonwoven fabric layer comprises the following components: by weight, 100-120 parts polypropylene and 5-6 parts modified nano titanium dioxide.