Natural antibacterial regenerated fiber medical textile fabric and preparation method thereof

Abstract

The invention relates to the technical field of antibacterial fabrics, in particular to a natural antibacterial regenerated fiber medical textile fabric and a preparation method thereof.The fabric is prepared from, by weight, 80-95 parts of regenerated fibers and 3-20 parts of an antibacterial agent which comprises 0.5-5 parts of silver nitrate; 3-15 parts of a green tea extract containing more than 90% of tea polyphenol; 2.5-16 parts of a sustained-release agent, wherein the sustained-release agent comprises 1-8 parts of EPON 828; 1 to 5 parts of beta-cyclodextrin; 0.5 to 3 parts of nano silicon dioxide; 0.7-5 parts of a pH regulator and buffer system, wherein the pH regulator and buffer system comprises 0.2-2 parts of citric acid; 0.5-3 parts of monopotassium phosphate and 2-11 parts of an after-finishing adhesive, wherein the after-finishing adhesive comprises 1-5 parts of an amino silane coupling agent; the two natural antibacterial agents, namely the silver ions and the tea polyphenol, are combined for use, so that the broad-spectrum and efficient antibacterial performance is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of antibacterial fabrics, and particularly to a natural antibacterial regenerated fiber medical fabric and a preparation method thereof. Background Art

[0002] With the continuous improvement of people's awareness of health and environmental protection, antibacterial textiles are increasingly widely used in daily life. However, there are still many problems with the antibacterial fabrics on the current market. Traditional antibacterial treatment methods usually rely on chemically synthesized antibacterial agents, such as triclosan, quaternary ammonium salts, etc. Although these substances have good antibacterial effects, long-term use may cause potential harm to human health and the environment. At the same time, these antibacterial agents are often difficult to form a stable bond with the fibers, resulting in poor antibacterial durability and significant performance degradation after multiple washes.

[0003] On the other hand, with the deepening of the concept of sustainable development, regenerated fibers have received more and more attention due to their environmental protection characteristics. However, the regenerated fiber medical fabrics on the current market often perform poorly in terms of functionality, especially in terms of antibacterial performance, with obvious deficiencies. How to endow regenerated fibers with durable antibacterial performance while maintaining their environmental protection advantages has become a technical problem urgently to be solved in the industry.

[0004] In the prior art, although there have been studies attempting to apply natural antibacterial agents such as silver ions and tea polyphenols to textiles, these methods often have the following problems: First, the use of a single antibacterial agent is difficult to achieve a broad-spectrum and highly efficient antibacterial effect; second, the bond between the antibacterial agent and the fiber is not stable enough, resulting in poor antibacterial durability; third, the antibacterial treatment often affects other properties of the fabric, such as breathability and moisture absorption; finally, the existing antibacterial treatment methods are difficult to endow the fabric with other functions besides antibacterial, such as ultraviolet resistance and antioxidant properties. Summary of the Invention

[0005] The present invention provides an innovative natural antibacterial regenerated fiber medical fabric and a preparation method thereof.

[0006] The purpose of the present invention is to provide a natural antibacterial regenerated fiber medical fabric, and the fabric is made of the following raw materials in parts by weight:

[0007] 80 - 95 parts of regenerated fiber, including:

[0008] 10 - 50 parts of lyocell fiber;

[0009] 10 - 40 parts of modal fiber;

[0010] 5 - 30 parts of bamboo fiber;

[0011] 5 - 25 parts of soy protein fiber;

[0012] 3 - 20 parts of antibacterial agent, including:

[0013] 0.5 - 5 parts of silver nitrate;

[0014] Green tea extract containing more than 90% tea polyphenols, 3 - 15 parts;

[0015] 2.5 - 16 parts of slow - release agent, including:

[0016] 1 - 8 parts of EPON 828;

[0017] 1 - 5 parts of β - cyclodextrin;

[0018] 0.5 - 3 parts of nano - silica;

[0019] 0.7 - 5 parts of pH regulator and buffer system, including:

[0020] 0.2 - 2 parts of citric acid;

[0021] 0.5 - 3 parts of potassium dihydrogen phosphate

[0022] 2 - 11 parts of after - finishing binder, including:

[0023] 1 - 5 parts of amino - silane coupling agent;

[0024] 1 - 6 parts of carboxymethyl chitosan.

[0025] The preparation method of the natural antibacterial regenerated fiber medical fabric includes the following steps:

[0026] (1) Pretreatment of the regenerated fiber substrate;

[0027] (2) Preparation of the antibacterial solution;

[0028] (3) Preparation of the slow - release agent system;

[0029] (4) pH adjustment and buffering;

[0030] (5) Fiber treatment;

[0031] (6) Weaving the fiber into cloth;

[0032] (7) After - finishing;

[0033] (8) Finished fabric treatment.

[0034] Specifically, the pretreatment of the regenerated fiber substrate in step (1) includes:

[0035] First, immerse the selected regenerated fiber in 0.5 - 2 parts by weight of sodium hydroxide solution with a concentration of 1 - 5wt%;

[0036] Secondly, stir and process at 45 - 55 °C for 30 - 50 minutes, with a stirring speed of 200 - 300 rpm;

[0037] Then, wash with deionized water until neutral;

[0038] Finally, centrifuge for dehydration, with a centrifuge speed of 3000 - 4000 rpm and a time of 5 - 10 minutes, and then conduct drying, with a drying temperature of 60 - 70 °C and a time of 30 - 60 minutes.

[0039] Specifically, the preparation of the antibacterial solution in step (2) includes:

[0040] Firstly, dissolve 0.5 - 5 parts by weight of silver nitrate in 500 mL of deionized water, with a stirring speed of 300 - 400 rpm, and stir at room temperature for 10 - 15 minutes;

[0041] Secondly, in another container, dissolve 3 - 15 parts by weight of green tea extract in 500 mL of deionized water, and stir at 60 - 70 °C for 30 minutes;

[0042] Finally, mix the two solutions and stir evenly at room temperature for 20 - 30 minutes.

[0043] Specifically, the preparation of the sustained - release agent system in step (3) includes:

[0044] Firstly, dissolve 1 - 8 parts by weight of EPON 828 in 100 mL of ethanol;

[0045] Secondly, add 1 - 5 parts by weight of β - cyclodextrin and 0.5 - 3 parts by weight of nano - silica, and conduct ultrasonic dispersion for 15 - 20 minutes with a power of 300 - 400 W;

[0046] Finally, slowly add this mixture to the antibacterial solution and stir at room temperature for 1 hour with a stirring speed of 300 - 400 rpm.

[0047] Specifically, the pH adjustment and buffering in step (4) include:

[0048] Firstly, dissolve 0.2 - 2 parts by weight of citric acid and 0.5 - 3 parts by weight of potassium dihydrogen phosphate in 100 mL of deionized water;

[0049] Then, slowly add it to the antibacterial solution and adjust the pH to 6.5 - 7.5.

[0050] Specifically, the fiber treatment in step (5) includes:

[0051] Firstly, immerse the pretreated regenerated fiber in the antibacterial solution with a bath ratio of 1:20;

[0052] Secondly, impregnate for 40 - 60 minutes at 65 - 75°C with a stirring speed of 100 - 150 rpm;

[0053] Finally, perform extrusion dewatering at a pressure of 0.2 - 0.3 MPa and then drying at a temperature of 80 - 90°C for 20 - 30 minutes.

[0054] Specifically, the step (6) of fiber weaving into cloth includes:

[0055] Firstly, card the treated recycled fibers through a carding machine to form a fiber web, with the carding speed controlled at 80 - 120 m / min;

[0056] Secondly, use a cross-laying machine to lay the fiber web into a multi-layer structure, with the laying speed of 15 - 25 m / min and the laying overlap degree controlled at 25% - 35%;

[0057] Then, consolidate using a needling machine with the needling frequency set at 800 - 1200 times / min and the needling depth of 10 - 15 mm;

[0058] Finally, perform a light calendering treatment on the needle-punched felt, with the calendering pressure controlled at 0.5 - 1.5 MPa and the calendering temperature of 80 - 100°C.

[0059] Specifically, the step (7) of post-treatment includes:

[0060] Firstly, prepare the post-treatment solution by dissolving 1 - 5 parts by weight of amino-silane coupling agent and 1 - 6 parts by weight of carboxymethyl chitosan in 500 mL of deionized water;

[0061] Secondly, treat the fabric using the padding method with a padding rate of 80% - 100%, and then perform drying at a temperature of 100 - 110°C for 5 - 10 minutes;

[0062] Finally, perform heat setting at a temperature of 140 - 160°C for 2 - 3 minutes.

[0063] Specifically, the step (8) of fabric finished product treatment includes:

[0064] Firstly, cut and sew the fabric as needed;

[0065] Secondly, perform precise cutting using an ultrasonic cutting machine with the cutting speed controlled at 20 - 30 m / min;

[0066] Finally, sew using an industrial sewing machine with the sewing speed set at 3000 - 4000 stitches / min.

[0067] The innovation points and technical effects of the present invention are mainly reflected in the following aspects:

[0068] This method ingeniously combines two natural antibacterial agents, silver ions and tea polyphenols, and utilizes the synergistic effect between them to achieve broad-spectrum and high-efficiency antibacterial performance. Silver ions (Ag + ) as an inorganic antibacterial agent can bind to the sulfhydryl groups (-SH) on the bacterial cell wall, disrupting the bacterial metabolic system and thus achieving a bactericidal effect. Tea polyphenols are polyphenolic compounds, and their molecular structure contains multiple phenolic hydroxyl groups (-OH). These hydroxyl groups can cross-link with the proteins on the bacterial cell membrane, causing the bacterial cell membrane to rupture and thus achieving an antibacterial effect.

[0069] More importantly, the present invention introduces a unique slow-release system, including EPON 828, β-cyclodextrin, and nano-silica. The design of this slow-release system is based on the principles of molecular inclusion and slow release. The cyclic structure of β-cyclodextrin can form inclusion compounds with silver ions and tea polyphenols, while epoxy resin and nano-silica further fix and control the release of these inclusion compounds. This design not only significantly improves the binding stability between the antibacterial agent and the fiber but also realizes the slow release of the antibacterial components, greatly prolonging the persistence of the antibacterial effect.

[0070] Another innovation point of the present invention lies in the optimized combination of regenerated fibers. By carefully designing the proportions of Lyocell fiber, Modal fiber, bamboo fiber, and soy protein fiber, the advantages of various fibers are fully exerted. While ensuring antibacterial performance, excellent air permeability, moisture absorption and quick-drying properties, and comfort are also achieved. This combination not only overcomes the problem of insufficient functionality of traditional regenerated fiber medical fabric materials but also provides new ideas for the development of high-performance and multifunctional environmentally friendly fabrics.

[0071] In addition, a fine pH adjustment and buffering system are introduced in the preparation method of the present invention, which is crucial for maintaining the stability of tea polyphenols and the activity of silver ions. By controlling the pH within the range of 6.5 - 7.5, both the stability of the antibacterial components and the avoidance of irritation to human skin are ensured.

[0072] The post-treatment process of the present invention is also a major highlight. By using amino-silane coupling agent and carboxymethyl chitosan, not only the binding between the antibacterial components and the fiber is further enhanced, but also excellent softness and wash resistance are imparted to the fabric. The design of this post-treatment process fully considers the intermolecular interactions. The siloxane groups of the amino-silane coupling agent can form covalent bonds with the fiber surface, while the amino groups can form ionic bonds or hydrogen bonds with the antibacterial components. Carboxymethyl chitosan, through its special molecular structure, not only enhances the moisture retention of the fabric but also provides an additional antibacterial effect.

[0073] In summary, through the synergistic effect of multiple components and precise process control, the present invention has successfully combined antibacterial performance, comfort, versatility, and environmental friendliness, creating a new type of functional fabric with great application prospects. This fabric can not only be applied to daily clothing but also be extended to high-demand fields such as medical protection and sports equipment, having a broad market prospect and social value. The success of the present invention not only solves many problems in the prior art but also provides a new direction for the sustainable development of the textile industry, having important theoretical significance and practical application value. Detailed Embodiments

[0074] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0075] Embodiment 1

[0076] This embodiment provides a natural antibacterial regenerated fiber medical fabric with high antibacterial performance, and its component ratio is as follows (by weight):

[0077] 50 parts of Lyocell fiber (trade name: Tencel, manufacturer: Lenzing AG), 10 parts of Modal fiber (trade name: Lenzing Modal, manufacturer: Lenzing AG), 5 parts of bamboo fiber, 15 parts of soy protein fiber, 0.5 part of silver nitrate, 15 parts of green tea extract (trade name: Green Tea Extract, manufacturer: Taiyo International, Inc.), 1 part of EPON 828 (manufacturer: Hexion Inc.), 5 parts of β-cyclodextrin, 0.5 part of nano-silica, 0.2 part of citric acid, 3 parts of potassium dihydrogen phosphate, 1 part of amino silane coupling agent (trade name: Silquest A-1100, manufacturer: Momentive Performance Materials), and 6 parts of carboxymethyl chitosan.

[0078] The preparation method of the natural antibacterial regenerated fiber medical fabric includes the following steps:

[0079] (1) Pretreatment of the regenerated fiber substrate:

[0080] First, immerse the selected regenerated fiber in 0.5 parts by weight of sodium hydroxide solution with a concentration of 1 wt%. Secondly, stir and process at 45 °C for 50 minutes with a stirring speed of 200 rpm. Then, wash with deionized water until neutral. Finally, perform centrifugal dehydration at a centrifugal speed of 3000 rpm for 10 minutes, and conduct drying at a drying temperature of 60 °C for 60 minutes.

[0081] (2) Preparation of antibacterial solution:

[0082] First, dissolve 0.5 parts by weight of silver nitrate in 500 mL of deionized water, with a stirring speed of 300 rpm, and stir at room temperature for 15 minutes. Secondly, in another container, dissolve 15 parts by weight of green tea extract in 500 mL of deionized water, and stir at 60 °C for 30 minutes. Finally, mix the two solutions and stir evenly at room temperature for 30 minutes.

[0083] (3) Preparation of sustained-release agent system:

[0084] First, dissolve 1 part by weight of EPON 828 in 100 mL of ethanol. Secondly, add 5 parts by weight of β-cyclodextrin and 0.5 parts by weight of nano-silica, and perform ultrasonic dispersion for 20 minutes with a power of 300 W. Finally, slowly add this mixture to the antibacterial solution and stir at room temperature for 1 hour with a stirring speed of 300 rpm.

[0085] (4) pH adjustment and buffering:

[0086] First, dissolve 0.2 parts by weight of citric acid and 3 parts by weight of potassium dihydrogen phosphate in 100 mL of deionized water. Then, slowly add it to the antibacterial solution and adjust the pH to 7.5.

[0087] (5) Fiber treatment:

[0088] First, immerse the pretreated regenerated fiber in the antibacterial solution with a bath ratio of 1:20. Secondly, impregnate at 65 °C for 60 minutes with a stirring speed of 100 rpm. Finally, perform extrusion dehydration with a pressure of 0.2 MPa, and conduct drying at a drying temperature of 80 °C for 30 minutes.

[0089] (6) Weaving the fiber into cloth:

[0090] First, the processed regenerated fibers are carded by a carding machine to form a fiber web, and the carding speed is controlled at 80 m / min. Secondly, a cross-laying machine is used to lay the fiber web into a multi-layer structure, the laying speed is 15 m / min, and the laying overlap is controlled at 25%. Then, a needling machine is used for consolidation, the needling frequency is set at 800 times / min, and the needling depth is 10 mm. Finally, the needled felt is subjected to a light calendering treatment, the calendering pressure is controlled at 0.5 MPa, and the calendering temperature is 80 °C.

[0091] (7) Post-finishing:

[0092] First, a post-finishing solution is prepared by dissolving 1 part by weight of an amino-silane coupling agent and 6 parts by weight of carboxymethyl chitosan in 500 mL of deionized water. Secondly, the fabric is treated by the padding method, the padding rate is 80%, and then dried, the drying temperature is 100 °C, and the time is 10 minutes. Finally, heat setting is carried out, the temperature is 140 °C, and the time is 3 minutes.

[0093] (8) Fabric finished product treatment:

[0094] First, the fabric is cut and sewn as needed. Secondly, an ultrasonic cutting machine is used for precise cutting, and the cutting speed is controlled at 20 m / min. Finally, an industrial sewing machine is used for sewing, and the sewing speed is set at 3000 stitches / min.

[0095] In this embodiment, the combination of high-content lyocell fibers and green tea extract can significantly improve the antibacterial performance of the fabric. Lyocell fibers have excellent moisture absorption and breathability, providing a good basis for the uniform distribution of antibacterial agents. At the same time, polyphenolic compounds in green tea extract not only have a strong antibacterial effect but also can form stable hydrogen bonds with the fibers to ensure the durability of the antibacterial effect. In addition, the high content of β-cyclodextrin helps to form stable inclusion compounds to achieve the slow-release effect of antibacterial components, further prolonging the antibacterial durability of the fabric.

[0096] Example 2

[0097] This embodiment provides a comfortable and breathable natural antibacterial regenerated fiber medical fabric, and its component ratio is as follows (by weight):

[0098] 30 parts of lyocell fiber, 25 parts of modal fiber, 15 parts of bamboo fiber, 10 parts of soy protein fiber, 2.5 parts of silver nitrate, 9 parts of green tea extract, 4 parts of EPON 828, 3 parts of β-cyclodextrin, 1.5 parts of nano-silica, 1 part of citric acid, 1.5 parts of potassium dihydrogen phosphate, 3 parts of amino-silane coupling agent, 3 parts of carboxymethyl chitosan.

[0099] The preparation method of the natural antibacterial regenerated fiber medical fabric includes the following steps:

[0100] (1) Pretreatment of the regenerated fiber substrate:

[0101] First, immerse the selected regenerated fiber in 1.2 parts by weight of sodium hydroxide solution with a concentration of 3 wt%. Second, stir at 50 °C for 40 minutes with a stirring speed of 250 rpm. Then, wash with deionized water until neutral. Finally, centrifuge for dehydration at a centrifugal speed of 3500 rpm for 7 minutes and then dry at a drying temperature of 65 °C for 45 minutes.

[0102] (2) Preparation of the antibacterial solution:

[0103] First, dissolve 2.5 parts by weight of silver nitrate in 500 mL of deionized water with a stirring speed of 350 rpm and stir at room temperature for 12 minutes. Second, in another container, dissolve 9 parts by weight of green tea extract in 500 mL of deionized water and stir at 65 °C for 30 minutes. Finally, mix the two solutions and stir evenly at room temperature for 25 minutes.

[0104] (3) Preparation of the sustained-release agent system:

[0105] First, dissolve 4 parts by weight of EPON 828 in 100 mL of ethanol. Second, add 3 parts by weight of β-cyclodextrin and 1.5 parts by weight of nano-silica and perform ultrasonic dispersion for 17 minutes with a power of 350 W. Finally, slowly add this mixture to the antibacterial solution and stir at room temperature for 1 hour with a stirring speed of 350 rpm.

[0106] (4) pH adjustment and buffering:

[0107] First, dissolve 1 part by weight of citric acid and 1.5 parts by weight of potassium dihydrogen phosphate in 100 mL of deionized water. Then, slowly add it to the antibacterial solution and adjust the pH to 7.0.

[0108] (5) Fiber treatment:

[0109] First, immerse the pretreated regenerated fiber in the antibacterial solution with a bath ratio of 1:30. Second, impregnate at 70 °C for 50 minutes with a stirring speed of 125 rpm. Finally, perform extrusion dehydration at a pressure of 0.25 MPa and then dry at a drying temperature of 85 °C for 25 minutes.

[0110] (6) Weaving the fiber into cloth:

[0111] First, the processed regenerated fiber is carded by a carding machine to form a fiber web, and the carding speed is controlled at 100 m / min. Secondly, a cross-laying machine is used to lay the fiber web into a multi-layer structure, the laying speed is 20 m / min, and the laying overlap is controlled at 30%. Then, a needling machine is used for consolidation, the needling frequency is set at 1000 times / min, and the needling depth is 12 mm. Finally, the needled felt is subjected to a light calendering treatment, the calendering pressure is controlled at 1 MPa, and the calendering temperature is 90 °C.

[0112] (7) Post-treatment:

[0113] First, prepare the post-treatment liquid by dissolving 3 parts by weight of an amino-silane coupling agent and 3 parts by weight of carboxymethyl chitosan in 500 mL of deionized water. Secondly, the fabric is treated by the padding method, the padding rate is 90%, and then dried, the drying temperature is 105 °C, and the time is 7 minutes. Finally, heat setting is carried out, the temperature is 150 °C, and the time is 2.5 minutes.

[0114] (8) Finished fabric treatment:

[0115] First, cut and sew the fabric according to requirements. Secondly, an ultrasonic cutting machine is used for precise cutting, and the cutting speed is controlled at 25 m / min. Finally, an industrial sewing machine is used for sewing, and the sewing speed is set at 3500 stitches / min.

[0116] In this embodiment, the balanced ratio of lyocell fiber, modal fiber and bamboo fiber, combined with an appropriate amount of soy protein fiber, not only provides excellent comfort and breathability, but also endows the fabric with good moisture absorption and sweat discharge performance. The synergistic effect of silver nitrate and green tea extract ensures the antibacterial effect of the fabric, while the optimized ratio of the slow-release agent system further improves the antibacterial persistence. In addition, the use of amino-silane coupling agent and carboxymethyl chitosan in the post-treatment process enhances the softness and washability of the fabric.

[0117] Example 3

[0118] This embodiment provides a high-strength and durable natural antibacterial regenerated fiber medical fabric, and its component ratio is as follows (in parts by weight):

[0119] 40 parts of lyocell fiber, 20 parts of modal fiber, 20 parts of bamboo fiber, 5 parts of soy protein fiber, 3.5 parts of silver nitrate, 7 parts of green tea extract, 828 parts of EPON, 2 parts of β-cyclodextrin, 2 parts of nano-silica, 1.5 parts of citric acid, 2 parts of potassium dihydrogen phosphate, 4 parts of amino-silane coupling agent, 2 parts of carboxymethyl chitosan.

[0120] The preparation method of the natural antibacterial regenerated fiber medical fabric includes the following steps:

[0121] (1) Pretreatment of the regenerated fiber substrate:

[0122] First, immerse the selected regenerated fiber in 1.8 parts by weight of sodium hydroxide solution with a concentration of 4 wt%. Second, stir at 52 °C for 45 minutes with a stirring speed of 270 rpm. Then, wash with deionized water until neutral. Finally, centrifuge for dehydration at a centrifugal speed of 3800 rpm for 8 minutes, and perform drying at a drying temperature of 68 °C for 50 minutes.

[0123] (2) Preparation of the antibacterial solution:

[0124] First, dissolve 3.5 parts by weight of silver nitrate in 500 mL of deionized water with a stirring speed of 380 rpm and stir at room temperature for 13 minutes. Second, in another container, dissolve 7 parts by weight of green tea extract in 500 mL of deionized water and stir at 68 °C for 30 minutes. Finally, mix the two solutions and stir evenly at room temperature for 28 minutes.

[0125] (3) Preparation of the sustained-release agent system:

[0126] First, dissolve 6 parts by weight of EPON 828 in 100 mL of ethanol. Second, add 2 parts by weight of β-cyclodextrin and 2 parts by weight of nano-silica, and perform ultrasonic dispersion for 18 minutes with a power of 370 W. Finally, slowly add this mixture to the antibacterial solution and stir at room temperature for 1 hour with a stirring speed of 370 rpm.

[0127] (4) pH adjustment and buffering:

[0128] First, dissolve 1.5 parts by weight of citric acid and 2 parts by weight of potassium dihydrogen phosphate in 100 mL of deionized water. Then, slowly add it to the antibacterial solution and adjust the pH to 6.8.

[0129] (5) Fiber treatment:

[0130] First, immerse the pretreated regenerated fiber in the antibacterial solution with a bath ratio of 1:25. Second, impregnate at 72 °C for 55 minutes with a stirring speed of 135 rpm. Finally, perform extrusion dehydration at a pressure of 0.28 MPa, and perform drying at a drying temperature of 88 °C for 28 minutes.

[0131] (6) Weaving the fiber into cloth:

[0132] First, the processed regenerated fibers are carded by a carding machine to form a fiber web, and the carding speed is controlled at 110 m / min. Secondly, a cross-laying machine is used to lay the fiber web into a multi-layer structure, the laying speed is 22 m / min, and the laying overlap is controlled at 32%. Then, needling consolidation is carried out using a needling machine, the needling frequency is set at 1100 times / min, and the needling depth is 13 mm. Finally, the needled felt is subjected to a light calendering treatment, the calendering pressure is controlled at 1.2 MPa, and the calendering temperature is 95 °C.

[0133] (7) Post-treatment:

[0134] First, prepare the post-treatment solution by dissolving 4 parts by weight of an amino-silane coupling agent and 2 parts by weight of carboxymethyl chitosan in 500 mL of deionized water. Secondly, the fabric is treated by the padding method, the padding rate is 95%, and then dried, the drying temperature is 108 °C, and the time is 8 minutes. Finally, heat setting is carried out, the temperature is 155 °C, and the time is 2.8 minutes.

[0135] (8) Finishing of the fabric product:

[0136] First, cut and sew the fabric as needed. Secondly, precise cutting is carried out using an ultrasonic cutting machine, and the cutting speed is controlled at 28 m / min. Finally, sewing is carried out using an industrial sewing machine, and the sewing speed is set at 3800 stitches / min.

[0137] In this embodiment, by increasing the proportion of lyocell fiber and bamboo fiber, and at the same time optimizing the ratio of silver nitrate and green tea extract, the balance between the fabric strength and antibacterial performance is achieved. The increase in the content of EPON 828 helps to enhance the cross-linking between fibers and improve the overall strength and durability of the fabric. In addition, the increase in the content of amino-silane coupling agent further improves the abrasion resistance and wrinkle resistance of the fabric. The addition of nano-silica not only helps the slow release of the antibacterial agent, but also improves the antistatic performance of the fabric.

[0138] Example 4

[0139] This embodiment provides an environmentally friendly and hypoallergenic natural antibacterial regenerated fiber medical fabric, and its component ratio is as follows (in parts by weight):

[0140] 20 parts of lyocell fiber, 35 parts of modal fiber, 25 parts of bamboo fiber, 20 parts of soy protein fiber, 1 part of silver nitrate, 12 parts of green tea extract, 2 parts of EPON 828, 4 parts of β-cyclodextrin, 1 part of nano-silica, 0.5 part of citric acid, 1 part of potassium dihydrogen phosphate, 2 parts of amino-silane coupling agent, 5 parts of carboxymethyl chitosan.

[0141] The preparation method of the natural antibacterial regenerated fiber medical fabric includes the following steps:

[0142] (1) Pretreatment of the regenerated fiber substrate:

[0143] First, immerse the selected regenerated fiber in 1 part by weight of sodium hydroxide solution with a concentration of 2 wt%. Second, stir at 48 °C for 35 minutes with a stirring speed of 220 rpm. Then, wash with deionized water until neutral. Finally, centrifuge for dehydration at a centrifuge speed of 3200 rpm for 6 minutes, and then dry at a drying temperature of 62 °C for 40 minutes.

[0144] (2) Preparation of the antibacterial solution:

[0145] First, dissolve 1 part by weight of silver nitrate in 500 mL of deionized water and stir at a speed of 320 rpm for 11 minutes at room temperature. Second, in another container, dissolve 12 parts by weight of green tea extract in 500 mL of deionized water and stir at 62 °C for 30 minutes. Finally, mix the two solutions and stir evenly at room temperature for 22 minutes.

[0146] (3) Preparation of the sustained-release agent system:

[0147] First, dissolve 2 parts by weight of EPON 828 in 100 mL of ethanol. Second, add 4 parts by weight of β-cyclodextrin and 1 part by weight of nano-silica, and perform ultrasonic dispersion for 16 minutes with a power of 320 W. Finally, slowly add this mixture to the antibacterial solution and stir at room temperature for 1 hour with a stirring speed of 320 rpm.

[0148] (4) pH adjustment and buffering:

[0149] First, dissolve 0.5 part by weight of citric acid and 1 part by weight of potassium dihydrogen phosphate in 100 mL of deionized water. Then, slowly add it to the antibacterial solution and adjust the pH to 7.2.

[0150] (5) Fiber treatment:

[0151] First, immerse the pretreated regenerated fiber in the antibacterial solution with a bath ratio of 1:35. Second, impregnate at 68 °C for 45 minutes with a stirring speed of 115 rpm. Finally, perform extrusion dehydration with a pressure of 0.22 MPa, and then dry at a drying temperature of 82 °C for 22 minutes.

[0152] (6) Weaving the fiber into cloth:

[0153] First, the processed regenerated fibers are carded by a carding machine to form a fiber web, and the carding speed is controlled at 90 m / min. Secondly, a cross-laying machine is used to lay the fiber web into a multi-layer structure, the laying speed is 18 m / min, and the laying overlap is controlled at 28%. Then, a needling machine is used for consolidation, the needling frequency is set at 900 times / min, and the needling depth is 11 mm. Finally, the needle-punched felt is lightly calendered, the calendering pressure is controlled at 0.8 MPa, and the calendering temperature is 85 °C.

[0154] (7) Post-treatment:

[0155] First, prepare the post-treatment solution by dissolving 2 parts by weight of an amino-silane coupling agent and 5 parts by weight of carboxymethyl chitosan in 500 mL of deionized water. Secondly, the fabric is treated by the padding method, the padding rate is 85%, and then dried, the drying temperature is 102 °C, and the time is 6 minutes. Finally, heat setting is carried out at a temperature of 145 °C for 2.2 minutes.

[0156] (8) Finished fabric treatment:

[0157] First, cut and sew the fabric as needed. Secondly, an ultrasonic cutting machine is used for precise cutting, and the cutting speed is controlled at 22 m / min. Finally, an industrial sewing machine is used for sewing, and the sewing speed is set at 3200 stitches / min.

[0158] In this embodiment, by increasing the proportions of modal fiber, bamboo fiber and soy protein fiber, while reducing the amount of silver nitrate and increasing the content of green tea extract, the environmental friendliness and hypoallergenicity of the fabric are achieved. The high proportions of modal fiber and bamboo fiber improve the softness and breathability of the fabric, while soy protein fiber endows the fabric with excellent moisture retention and skin-friendly properties. The increase in the content of green tea extract not only enhances the natural antibacterial effect, but also brings antioxidant and UV protection functions to the fabric. In addition, the increase in the content of carboxymethyl chitosan further improves the moisture retention and biocompatibility of the fabric, making it more suitable for sensitive skin.

[0159] By adjusting the proportions of different components and preparation parameters, natural antibacterial regenerated fiber medical fabric with different characteristics and properties can be obtained to meet diverse application requirements.

[0160] Comparative Example 1: Natural antibacterial regenerated fiber medical fabric lacking a sustained-release agent system and its preparation method

[0161] This comparative example aims to verify the effect of the sustained-release agent system on the persistence of antibacterial performance and is compared with Example 1. Its component ratios are as follows (in parts by weight):

[0162] 50 parts of lyocell fiber, 10 parts of modal fiber, 5 parts of bamboo fiber, 15 parts of soy protein fiber, 0.5 part of silver nitrate, 15 parts of green tea extract, 0.2 part of citric acid, 3 parts of potassium dihydrogen phosphate, 1 part of aminosilane coupling agent, 6 parts of carboxymethyl chitosan.

[0163] The preparation method of the natural antibacterial regenerated fiber medical fabric for this comparative example includes the following steps:

[0164] (1) Pretreatment of the regenerated fiber substrate:

[0165] The same as in Example 1.

[0166] (2) Preparation of the antibacterial solution:

[0167] The same as in Example 1.

[0168] (3) pH adjustment and buffering:

[0169] First, dissolve 0.2 parts by weight of citric acid and 3 parts by weight of potassium dihydrogen phosphate in 100 mL of deionized water. Then, slowly add it to the antibacterial solution and adjust the pH to 7.5.

[0170] (4) Fiber treatment:

[0171] The same as in Example 1.

[0172] (5) Weaving the fiber into cloth:

[0173] The same as in Example 1.

[0174] (6) Post-finishing:

[0175] The same as in Example 1.

[0176] (7) Finished fabric treatment:

[0177] The same as in Example 1.

[0178] In this comparative example, due to the lack of the sustained-release agent system (EPON 828, β-cyclodextrin, and nano-silica), the antibacterial agent may be released rapidly, resulting in the inability to maintain the antibacterial effect for a long time. This will cause a significant decline in the antibacterial performance of the fabric after multiple washes and cannot meet the requirements for long-term use.

[0179] Comparative Example 2: Natural antibacterial regenerated fiber medical fabric with low content of regenerated fiber and its preparation method

[0180] This comparative example aims to verify the influence of the content of regenerated fiber on the fabric performance and is compared with Example 2. Its component ratio is as follows (in parts by weight):

[0181] 10 parts of lyocell fiber, 10 parts of modal fiber, 5 parts of bamboo fiber, 5 parts of soy protein fiber, 50 parts of polyester fiber, 2.5 parts of silver nitrate, 9 parts of green tea extract, 4 parts of EPON 828, 3 parts of β-cyclodextrin, 1.5 parts of nano-silica, 1 part of citric acid, 1.5 parts of potassium dihydrogen phosphate, 3 parts of amino-silane coupling agent, 3 parts of carboxymethyl chitosan.

[0182] The preparation method of the natural antibacterial regenerated fiber medical fabric for this comparative example includes the following steps:

[0183] (1) Fiber mixing:

[0184] First, mix the regenerated fibers (lyocell fiber, modal fiber, bamboo fiber and soy protein fiber) with polyester fiber according to the above ratio. Secondly, use a carding machine to fully card the mixed fibers, and the carding time is 30 minutes.

[0185] (2) Preparation of antibacterial solution:

[0186] The same as Example 2.

[0187] (3) Preparation of the sustained-release agent system:

[0188] The same as Example 2.

[0189] (4) pH adjustment and buffering:

[0190] The same as Example 2.

[0191] (5) Fiber treatment:

[0192] The same as Example 2, but the bath ratio is adjusted to 1:40.

[0193] (6) Weaving the fiber into cloth:

[0194] The same as Example 2, but the carding speed is adjusted to 90 m / min.

[0195] (7) Post-finishing:

[0196] The same as Example 2.

[0197] (8) Finished fabric treatment:

[0198] The same as Example 2.

[0199] In this comparative example, due to the low content of regenerated fibers and the high content of polyester fibers, the hygroscopicity, air permeability and comfort of the fabric may be significantly reduced. In addition, the adhesion effect of the antibacterial agent on polyester fibers may not be as ideal as that on regenerated fibers, which may lead to a decrease in antibacterial performance.

[0200] Comparative Example 3: Natural Antibacterial Regenerated Fiber Medical Fabric with High-Concentration Silver Ions and Its Preparation Method

[0201] This comparative example aims to verify the influence of high-concentration silver ions on the fabric properties and environmental friendliness, and is compared with Example 3. The component ratio is as follows (by weight):

[0202] 40 parts of lyocell fiber, 20 parts of modal fiber, 20 parts of bamboo fiber, 5 parts of soy protein fiber, 10 parts of silver nitrate, 7 parts of green tea extract, 6 parts of EPON 828, 2 parts of β-cyclodextrin, 2 parts of nano-silica, 1.5 parts of citric acid, 2 parts of potassium dihydrogen phosphate, 4 parts of amino silane coupling agent, 2 parts of carboxymethyl chitosan.

[0203] The preparation method of the natural antibacterial regenerated fiber medical fabric in this comparative example includes the following steps:

[0204] (1) Pretreatment of the regenerated fiber substrate:

[0205] Same as Example 3.

[0206] (2) Preparation of the antibacterial solution:

[0207] First, dissolve 10 parts by weight of silver nitrate in 500 mL of deionized water, with a stirring speed of 400 rpm, and stir for 15 minutes at room temperature. Second, in another container, dissolve 7 parts by weight of green tea extract in 500 mL of deionized water, and stir for 30 minutes at 68 °C. Finally, mix the two solutions and stir evenly at room temperature for 30 minutes.

[0208] (3) Preparation of the sustained-release agent system:

[0209] Same as Example 3.

[0210] (4) pH adjustment and buffering:

[0211] Same as Example 3.

[0212] (5) Fiber treatment:

[0213] Same as Example 3, but the impregnation time is extended to 70 minutes.

[0214] (6) Weaving the fiber into cloth:

[0215] Same as Example 3.

[0216] (7) Post-finishing:

[0217] Same as Example 3.

[0218] (8) Finished fabric treatment:

[0219] Same as Example 3.

[0220] In this comparative example, high concentrations of silver ions may cause the fabric to discolor or turn yellow, affecting its aesthetic appearance. In addition, excessive silver ion content may cause irritation to the human skin, reducing the comfort and safety of the fabric. At the same time, the release of excessive silver ions into the environment may have a negative impact on the ecosystem, not meeting the requirements of environmental friendliness.

[0221] Comparative Example 4: Natural Antibacterial Regenerated Fiber Medical Fabric without Tea Polyphenols and Its Preparation Method

[0222] This comparative example aims to verify the influence of tea polyphenols on the antibacterial performance and functionality of the fabric and make a comparison with Example 4. Its component ratio is as follows (by weight):

[0223] 20 parts of Lyocell fiber, 35 parts of Modal fiber, 25 parts of bamboo fiber, 20 parts of soy protein fiber, 1 part of silver nitrate, 2 parts of EPON 828, 4 parts of β-cyclodextrin, 1 part of nano-silica, 0.5 part of citric acid, 1 part of potassium dihydrogen phosphate, 2 parts of amino-silane coupling agent, 5 parts of carboxymethyl chitosan.

[0224] The preparation method of the natural antibacterial regenerated fiber medical fabric in this comparative example includes the following steps:

[0225] (1) Pretreatment of the regenerated fiber substrate:

[0226] The same as in Example 4.

[0227] (2) Preparation of the antibacterial solution:

[0228] Dissolve 1 part by weight of silver nitrate in 500 mL of deionized water, with a stirring speed of 320 rpm, and stir at room temperature for 15 minutes.

[0229] (3) Preparation of the sustained-release agent system:

[0230] The same as in Example 4, but without adding green tea extract.

[0231] (4) pH adjustment and buffering:

[0232] The same as in Example 4.

[0233] (5) Fiber treatment:

[0234] The same as in Example 4.

[0235] (6) Weaving the fibers into fabric:

[0236] The same as in Example 4.

[0237] (7) Post-finishing:

[0238] The same as in Example 4.

[0239] (8) Finishing treatment of the fabric product:

[0240] Same as Example 4.

[0241] In this comparative example, due to the lack of tea polyphenols, the fabric may lose its antioxidant and ultraviolet protection functions. In addition, the absence of tea polyphenols as a natural antibacterial agent may lead to a narrowing of the antibacterial spectrum of the fabric, relying only on the antibacterial effect of silver ions. This may reduce the antibacterial effect of the fabric against certain specific microorganisms and may also affect the antibacterial persistence.

[0242] Comparative Example 5: Natural antibacterial regenerated fiber medical fabric without post-finishing treatment and its preparation method

[0243] This comparative example aims to verify the influence of post-finishing treatment on the fabric properties and is compared with Example 1. Its component ratio is the same as that of Example 1, but the post-finishing step is omitted during the preparation process.

[0244] The preparation method of the natural antibacterial regenerated fiber medical fabric in this comparative example includes the following steps:

[0245] (1) Pretreatment of the regenerated fiber substrate:

[0246] Same as Example 1.

[0247] (2) Preparation of the antibacterial solution:

[0248] Same as Example 1.

[0249] (3) Preparation of the slow-release agent system:

[0250] Same as Example 1.

[0251] (4) pH adjustment and buffering:

[0252] Same as Example 1.

[0253] (5) Fiber treatment:

[0254] Same as Example 1.

[0255] (6) Weaving the fiber into fabric:

[0256] Same as Example 1.

[0257] (7) Finishing treatment of the fabric product:

[0258] Directly carry out cutting and sewing, skipping the post-finishing step.

[0259] In this comparative example, due to the lack of post-treatment, the fabric may lack softness and wash resistance. The absence of the amino-silane coupling agent and carboxymethyl chitosan may lead to poor fixation of the antibacterial components, affecting the durability of the antibacterial performance. At the same time, the wrinkle resistance and shape stability of the fabric may also be affected.

[0260] Comparative Example 6: Antibacterial Treatment Method for Traditional Cotton Fabric

[0261] This comparative example aims to compare the present invention with the antibacterial treatment method for traditional cotton fabric, highlighting the innovation and superiority of the present invention.

[0262] The antibacterial treatment method for traditional cotton fabric includes the following steps:

[0263] (1) Pretreatment of cotton fabric:

[0264] First, immerse the cotton fabric in a sodium hydroxide solution of 0.5 parts by weight with a solution concentration of 1 wt%. Second, stir at 50 °C for 30 minutes with a stirring speed of 200 rpm. Then, wash with deionized water until neutral. Finally, centrifuge for dehydration at a centrifuge speed of 3000 rpm for 5 minutes, and then dry at a drying temperature of 60 °C for 30 minutes.

[0265] (2) Preparation of antibacterial solution:

[0266] Dissolve 5 parts by weight of triclosan in 500 mL of deionized water, stir at a speed of 300 rpm, and stir at room temperature for 15 minutes.

[0267] (3) Antibacterial treatment:

[0268] First, immerse the pretreated cotton fabric in the antibacterial solution with a bath ratio of 1:20. Second, impregnate at 60 °C for 30 minutes with a stirring speed of 100 rpm. Finally, perform extrusion dehydration at a pressure of 0.2 MPa, and then dry at a drying temperature of 80 °C for 20 minutes.

[0269] (4) Finished fabric treatment:

[0270] Same as Example 1.

[0271] In this comparative example, the traditional cotton fabric uses a chemically synthesized antibacterial agent (such as triclosan), which may pose potential hazards to the human body and the environment. In contrast, the present invention uses natural antibacterial agents (silver ions and tea polyphenols) combined with regenerated fibers, which not only have better biocompatibility and environmental friendliness, but also can achieve long-term antibacterial through a slow-release system. In addition, the multi-component synergistic effect of the present invention can endow the fabric with multifunctionality, such as antioxidant and ultraviolet protection, which is difficult to achieve by traditional antibacterial treatment methods.

[0272] Through these six comparative examples, the superiority of the present invention in aspects such as antibacterial persistence, fabric performance, environmental friendliness, and multifunctionality can be clearly seen. These comparative examples cover various endpoint values and intermediate values in the formulation, and at the same time verify the importance of each key component, strongly supporting the innovation and practical value of the present invention.

[0273] To comprehensively evaluate the effectiveness and superiority of the natural antibacterial regenerated fiber medical fabric and its preparation method of the present invention, a series of test experiments were designed. These experiments cover aspects such as antibacterial performance, physical properties, comfort, environmental friendliness, and multifunctional characteristics to comprehensively reflect the innovation points and advantages of the present invention.

[0274] Experiment 1: Antibacterial performance test

[0275] Experimental method: The antibacterial performance test was carried out according to the standard of GB / T 20944.3-2008. First, the fabric samples were cut into small pieces of 25mm×25mm and inoculated with Escherichia coli and Staphylococcus aureus respectively. Secondly, they were cultured at 37°C for 24 hours. Then, the number of colonies was calculated and the bacteriostatic rate was calculated. Finally, after 50 standard washes of the samples, the above steps were repeated to evaluate the antibacterial persistence.

[0276] Experiment 2: Air permeability test

[0277] Experimental method: The air permeability test was carried out according to the standard of GB / T 5453-1997. Using a YG461E digital fabric air permeability tester, the test area was 20cm 2 , and the pressure difference was 100Pa. Each sample was tested 5 times and the average value was taken.

[0278] Experiment 3: Moisture absorption and quick-drying performance test

[0279] Experimental method: The test was carried out with reference to the standard of GB / T 21655.1-2008. First, the fabric samples were cut into squares of 200mm×200mm. Secondly, they were balanced in a standard environment of 20°C and 65% relative humidity for 24 hours. Then, 0.2 mL of distilled water was dropped on the center of the sample, and the time when the water droplet was completely absorbed was recorded. Finally, the wet spot diffusion area was measured.

[0280] Experiment 4: Anti-ultraviolet performance test

[0281] Experimental method: The test was carried out according to the standard of GB / T 18830-2009. Using an SDLAtlas M284 ultraviolet transmittance analyzer, the ultraviolet protection factor (UPF) of the fabric was measured.

[0282] Experiment 5: Antioxidant performance test

[0283] Experimental method: The DPPH free radical scavenging ability assay was used. First, the fabric was soaked in ethanol for 24 hours for extraction. Second, the extract was mixed with the DPPH ethanol solution and reacted in the dark for 30 minutes. Then, the absorbance was measured using an ultraviolet spectrophotometer at a wavelength of 517 nm. Finally, the DPPH free radical scavenging rate was calculated.

[0284] Experiment 6: Biocompatibility test

[0285] Experimental method: The cytotoxicity test was carried out with reference to the ISO 10993-5:2009 standard. The MTT method was used to evaluate the proliferation of L929 mouse fibroblasts in the fabric extract. After culturing for 24 hours, the cell viability was measured.

[0286] The experimental results are as follows:

[0287] Table 1: Antibacterial performance test results

[0288]

[0289] Table 2: Physical property and functionality test results

[0290]

[0291] Based on the above experimental results, we can draw the following conclusions:

[0292] 1. Antibacterial performance: Examples 1-4 all showed excellent initial antibacterial performance and persistence. In particular, for Example 1, even after 50 washes, the bacteriostatic rate remained above 98%. This is mainly attributed to the synergistic antibacterial effect of silver ions and tea polyphenols, as well as the effective control of the slow-release system. In contrast, Comparative Example 1 (without slow-release system) and Comparative Example 5 (without post-treatment) showed a significant decline in antibacterial performance after multiple washes, demonstrating the importance of the slow-release system and post-treatment process in the present invention.

[0293] 2. Air permeability and moisture absorption and quick-drying property: Examples 2 and 4 showed the best air permeability and moisture absorption and quick-drying property, which benefited from the optimized combination of regenerated fibers. In contrast, Comparative Example 2 (low content of regenerated fibers) and Comparative Example 6 (traditional cotton fabric) performed poorly in these aspects, highlighting the advantages of the present invention in terms of comfort.

[0294] 3. Anti-ultraviolet performance: Examples 1-4 all showed good anti-ultraviolet performance, and the UPF values all reached above 30+. This is mainly attributed to the presence of tea polyphenols, which not only have antibacterial effects but also can effectively absorb ultraviolet rays. Comparative Example 4 (without tea polyphenols) showed significantly poorer performance in this test, further confirming the multifunctionality of tea polyphenols.

[0295] 4. Antioxidant performance: The DPPH radical scavenging rates of Examples 1-4 were all above 75%, showing excellent antioxidant performance. This is mainly due to the strong antioxidant ability of tea polyphenols. Comparative Examples 4 and 6 performed poorly in this test, further demonstrating the important role of tea polyphenols in the present invention.

[0296] 5. Biocompatibility: The cell survival rates of all examples were above 97%, showing excellent biocompatibility. In contrast, the cell survival rate of Comparative Example 3 (high-concentration silver ions) was relatively low, indicating that excessive concentrations of silver ions may have potential toxicity to human cells.

[0297] Based on the above test results, Example 1 can be considered the best example. It showed excellent performance in antibacterial properties, antibacterial persistence, UV resistance, and antioxidant performance, and at the same time had good air permeability, moisture absorption and quick-drying properties, and biocompatibility.

[0298] The present invention demonstrates the following unexpected technical effects:

[0299] 1. Ultra-long-lasting antibacterial: Through the synergistic effect of silver ions and tea polyphenols, combined with a unique slow-release system, ultra-long-lasting antibacterial performance was achieved. Even after 50 washes, the antibacterial rate remained above 97%, which far exceeded the effect of traditional antibacterial treatments.

[0300] 2. Multifunctional synergy: The present invention not only achieved excellent antibacterial performance, but also had multiple functions such as UV resistance and antioxidant properties. The realization of this multifunctionality benefited from the synergistic effect among the components, especially the multiple functions of tea polyphenols.

[0301] 3. Balance between environmental friendliness and biocompatibility: The present invention successfully achieved excellent biocompatibility while maintaining high antibacterial performance. This broke the traditional perception that highly efficient antibacterial agents may be harmful to the human body and provided new ideas for the development of safe and highly efficient antibacterial materials.

[0302] 4. Optimization of regenerated fiber properties: Through a carefully designed fiber ratio and treatment process, the present invention fully utilized the advantages of various regenerated fibers and achieved excellent comfort and air permeability while maintaining excellent functionality.

[0303] 5. Sustainable development potential: The present invention uses regenerated fibers and natural antibacterial agents, which not only have excellent performance but also good environmental friendliness. This provides a new direction for the sustainable development of the textile industry.

[0304] Generally speaking, through the synergistic effect of multiple components and fine process control, the present invention has successfully combined antibacterial performance, comfort, multifunctionality and environmental friendliness organically, creating a new type of functional fabric with great application prospects. This fabric can not only be applied to daily clothing, but also be extended to high-demand fields such as medical protection and sports equipment, with broad market prospects and social value.

[0305] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. Natural antibacterial regenerated fiber medical fabric, characterized in that: The fabric is made of the following raw materials in parts by weight: 80-95 parts of recycled fiber, including: Lyocell fiber 10-50 parts; Modal fiber 10-40 parts; 5-30 parts of bamboo fiber; 5-25 servings of soy protein fiber; 3-20 parts of antimicrobial agents, including: 0.5-5 parts of silver nitrate; Green tea extract, the green tea extract containing more than 90% tea polyphenols, 3-15 parts; 2.5-16 parts of sustained-release preparation, including: EPON 828 1-8 copies; β-cyclodextrin 1-5 parts; 0.5-3 parts of nano silicon dioxide; 0.7-5 parts of pH adjuster and buffer system, including: 0.2-2 parts of citric acid; 0.5-3 parts potassium dihydrogen phosphate 2-11 parts of post-finishing adhesive, including: 1-5 parts of aminosilane coupling agent; 1-6 parts of carboxymethyl chitosan.

2. The method for preparing the natural antibacterial regenerated fiber medical fabric according to claim 1, characterized in that: The following steps are involved: (1) Pretreatment of regenerated fiber substrate; (2) Preparation of antibacterial solution; (3) Preparation of sustained-release systems; (4) pH adjustment and buffering; (5) Fiber processing; (6) Fibers are woven into cloth; (7) Post-processing; (8) Fabric finishing process.

3. The method for preparing the natural antibacterial regenerated fiber medical fabric according to claim 2, characterized in that: The step (1) of pre-treating the regenerated fiber substrate comprises: First, the selected regenerated fiber is immersed in 0.5-2 parts by weight of a sodium hydroxide solution, wherein the concentration of the sodium hydroxide solution is 1-5wt%; Secondly, stirring at 45-55°C for 30-50 minutes at a stirring speed of 200-300 rpm; Then, wash with deionized water until neutral; Finally, centrifugal dehydration is performed at a centrifugal speed of 3000-4000 rpm for 5-10 minutes, and drying is performed at a drying temperature of 60-70° C. for 30-60 minutes.

4. The method for preparing the natural antibacterial regenerated fiber medical fabric according to claim 2, characterized in that: The preparation of the antibacterial solution in step (2) comprises: First, dissolve 0.5-5 parts by weight of silver nitrate in 500 mL of deionized water, stir at 300-400 rpm, and stir at room temperature for 10-15 minutes; Secondly, in another container, 3-15 parts by weight of green tea extract is dissolved in 500 mL of deionized water and stirred at 60-70° C. for 30 minutes; Finally, the two solutions were mixed and stirred evenly at room temperature for 20 to 30 minutes.

5. The method for preparing the natural antibacterial regenerated fiber medical fabric according to claim 2, characterized in that: The preparation of the sustained-release agent system in step (3) comprises: First, 1-8 parts by weight of EPON 828 was dissolved in 100 mL of ethanol; Secondly, add 1-5 parts by weight of β-cyclodextrin and 0.5-3 parts by weight of nano-silicon dioxide, and perform ultrasonic dispersion. The ultrasonic time is 15-20 minutes and the power is 300-400W; Finally, this mixture was slowly added to the antibacterial solution and stirred at room temperature for 1 hour at a stirring speed of 300-400 rpm.

6. The method for preparing the natural antibacterial regenerated fiber medical fabric according to claim 2, characterized in that: The step (4) of pH adjustment and buffering comprises: First, 0.2-2 parts by weight of citric acid and 0.5-3 parts by weight of potassium dihydrogen phosphate are dissolved in 100 mL of deionized water; Then, slowly add it to the antibacterial solution and adjust the pH to 6.5-7.

5.

7. The method for preparing the natural antibacterial regenerated fiber medical fabric according to claim 2, characterized in that: The fiber treatment in step (5) comprises: First, the pretreated regenerated fiber was immersed in the antibacterial solution with a bath ratio of 1:20; Secondly, immerse at 65-75°C for 40-60 minutes with a stirring speed of 100-150 rpm; Finally, extrusion dehydration is performed at a pressure of 0.2-0.3 MPa, and drying is performed at a temperature of 80-90°C for 20 to 30 minutes.

8. The method for preparing the natural antibacterial regenerated fiber medical fabric according to claim 2, characterized in that: The step (6) of weaving the fibers into cloth comprises: First, the treated regenerated fiber is combed through a carding machine to form a fiber web, and the carding speed is controlled at 80-120m / min; Secondly, use a cross-lapping machine to lay the fiber web into a multi-layer structure, with a laying speed of 15-25m / min and a laying overlap of 25% to 35%; Then, a needle punching machine was used for consolidation, with the frequency of needling set to 800-1200 times / min and the depth of needling set to 10-15 mm; Finally, the needle felt is lightly calendered, the calendering pressure is controlled at 0.5-1.5 MPa, and the calendering temperature is 80-100°C.

9. The method for preparing the natural antibacterial regenerated fiber medical fabric according to claim 2, characterized in that: The post-processing of step (7) comprises: First, a finishing solution is prepared by dissolving 1-5 parts by weight of an aminosilane coupling agent and 1-6 parts by weight of carboxymethyl chitosan in 500 mL of deionized water; Secondly, the fabric is treated by padding method, the padding rate is 80% to 100%, and then dried at a temperature of 100-110°C for 5 to 10 minutes; Finally, heat setting is performed at a temperature of 140-160°C for 2 to 3 minutes.

10. The method for preparing the natural antibacterial regenerated fiber medical fabric according to claim 2, characterized in that: The step (8) of processing the finished fabric includes: First, cut and sew the fabric as needed; Secondly, use ultrasonic cutting machine for precise cutting, and the cutting speed is controlled at 20-30m / min; Finally, an industrial sewing machine is used for sewing, and the sewing speed is set to 3000-4000 stitches / min.

Images