Non-elution antibacterial flushable spunlace fabric and preparation method thereof

Abstract

The application belongs to the technical field of flushable hydroentangled fabric and specifically relates to a non-dissolution antibacterial flushable hydroentangled fabric and a preparation method thereof. The method comprises the following steps: 1) mixing wood pulp fibers and cellulose fibers, adding water to prepare a fiber slurry, adopting a wet-laid process to prepare a fiber web, and hydroentangling to obtain a flushable hydroentangled fabric base material; 2) applying an antibacterial finishing liquid to the flushable hydroentangled fabric base material by a padding method; the antibacterial agent in the antibacterial finishing liquid is compounded from an organosilicon quaternary ammonium salt and a chitosan quaternary ammonium salt; 3) pre-drying and then baking the hydroentangled fabric after antibacterial finishing, and then washing, drying and obtaining the flushable hydroentangled fabric. The flushable hydroentangled fabric obtained by the application has excellent and stable antibacterial performance and the antibacterial agent is not easy to dissolve; the finishing process is mild, the product maintains excellent flushable performance; migration of the antibacterial agent to the skin is avoided, the product is safe and mild, and the application is especially suitable for personal hygiene care scenes such as infants, sensitive skin and long-term users.

Description

Technical Field

[0001] This invention belongs to the field of washable spunlace fabric technology, specifically relating to a non-leaching antibacterial washable spunlace fabric and its preparation method. Background Technology

[0002] Wet toilet paper, as a daily care product that combines cleaning and hygiene functions, is gradually gaining popularity among consumers due to its convenience, thorough cleaning, and flushability. Since wet toilet paper comes into direct contact with human skin and mucous membranes during use, its antibacterial properties have become an important indicator of product safety and functionality.

[0003] Currently, there are two main ways in which wet toilet paper achieves its antibacterial function:

[0004] Firstly, antibacterial preservatives are added to the wet toilet paper solution. These include chemical and natural antibacterial agents. Common chemical antibacterial preservatives include benzalkonium chloride, sodium benzoate, potassium sorbate, and chlorhexidine. These chemicals dissolve in the solution and inhibit microbial growth during the storage of the wet toilet paper. However, these antibacterial agents come into direct contact with human skin during use, and some people may experience adverse reactions such as skin irritation, itching, redness, or even allergies, especially infants, people with sensitive skin, and long-term users. Natural antibacterial agents mainly use plant extracts (such as chamomile, aloe vera, and tea tree oil) and ingredients like Sichuan pepper and oat alkaloids. Through compounding, they achieve a high bacterial removal rate while also providing moisturizing and soothing effects, but their antibacterial efficacy is generally weaker than that of chemical agents.

[0005] Secondly, antibacterial agents are physically attached to the fiber surface through finishing processes such as impregnation and spraying. However, this type of attachment mainly relies on physical adsorption or electrostatic attraction, resulting in weak bonding. During use, the antibacterial agent may detach from the fiber surface due to friction or liquid rinsing, dissolving into the solution or migrating directly onto the skin. This weakly bonded antibacterial agent may not only lead to excessively high local concentrations causing irritation, but also reduce the product's long-lasting antibacterial performance due to dissolution. Furthermore, the dissolved antibacterial substances may enter the environment with the washout, posing an ecological safety risk.

[0006] Therefore, developing a washable nonwoven fabric with antibacterial agents that are non-leaching, non-migrating, non-irritating to the skin, and with long-lasting antibacterial properties, and its preparation method, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] The purpose of this invention is to provide a non-leaching antibacterial spunlace fabric and its preparation method, which solves the problems of easy leaching and migration of antibacterial agents in existing wet toilet paper base fabrics, and skin irritation.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A method for preparing a non-leaching antibacterial washable spunlace nonwoven fabric includes the following steps:

[0010] 1) Substrate preparation: Wood pulp fiber and cellulose fiber are mixed, water is added to make fiber slurry, and the fiber web is made by wet web forming process. After hydroentangling, the fiber web is reinforced to obtain a washable hydroentangled fabric substrate.

[0011] 2) Antibacterial finishing: The antibacterial finishing liquid is applied to the obtained washable spunlace fabric substrate by padding to obtain the antibacterial base fabric;

[0012] The antibacterial finishing solution is composed of the following components at the following concentrations: 10-30 g / L of composite antibacterial agent, 1-3 g / L of nonionic wetting agent, and the remainder being pH adjuster and water; the pH adjuster adjusts the pH of the antibacterial finishing solution to 5.0-7.0; the composite antibacterial agent is a compound of organosilicon quaternary ammonium salt and chitosan quaternary ammonium salt in a mass ratio of 0.3-2.3:1.

[0013] 3) Post-treatment: The obtained antibacterial base fabric is first pre-dried at 70-100℃ for 2-4 minutes, then baked at 120-140℃ for 30-60 seconds, and then washed and dried to obtain the non-leaching antibacterial washable spunlace fabric.

[0014] In step 1), the mass ratio of wood pulp fiber to cellulose fiber is 70-80:20-30.

[0015] Furthermore, in step 1), the hydroentangling reinforcement process is summarized, and the hydroentangling pressure is controlled at 2.0-3.5MPa.

[0016] The wood pulp fibers are 2-4 mm long; the cellulose fibers are 8-12 mm long.

[0017] The linear density of the cellulose fiber is 1.33-1.67 dtex.

[0018] The cellulose fiber is any one or a combination of viscose fiber and lyocell fiber.

[0019] The organosilicon quaternary ammonium salt is dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride.

[0020] The chitosan quaternary ammonium salt is hydroxypropyltrimethylammonium chloride chitosan.

[0021] Furthermore, the molecular weight of the hydroxypropyltrimethylammonium chloride chitosan is 100,000-300,000 Da.

[0022] The nonionic wetting agent is fatty alcohol polyoxyethylene ether; the pH adjuster is citric acid.

[0023] Furthermore, in step 2), the padding method employs a one-dip-one-roll process. The temperature of the antibacterial finishing solution is 20-30℃. The rolling mill speed is 30-60m / min.

[0024] Furthermore, in step 2), the immersion rolling method controls the slurry rate to be 77%-83%.

[0025] The antibacterial finishing in step 2) satisfies the following: the mass fraction of the composite antibacterial agent in the resulting non-leaching antibacterial washable spunlace fabric is 1.5%-2.5%.

[0026] Furthermore, the basis weight of the non-leaching antibacterial washable spunlace fabric obtained in step 3) is 80-85 g / m². 2 .

[0027] In step 3), the drying temperature is 180-200℃, and the product is dried until the moisture content is ≤10%.

[0028] Furthermore, in step 3), the water washing is performed at least twice using deionized water, with each water washing lasting no less than 5 minutes.

[0029] The antibacterial finishing solution used in this invention employs a combination of organosilicon quaternary ammonium salt and chitosan quaternary ammonium salt as a non-leaching antibacterial agent. The -Si(OCH3)3 groups in the organosilicon quaternary ammonium salt molecule can chemically bond with the fiber surface and simultaneously self-condense to form a film. Chitosan quaternary ammonium salt (HACC), as a water-soluble cationic polysaccharide, has positively charged quaternary ammonium salt groups that strongly electrostatically adsorb onto the negatively charged hydroxyl groups on the fiber surface. The synergistic effect of these two agents achieves a dual fixation mechanism of chemical bonding and electrostatic adsorption, resulting in a broader-spectrum and more durable antibacterial effect. Furthermore, it avoids the drawbacks of leaching antibacterial agents, such as the need for adhesives, which leads to a hard feel and significant color change in the finished spunlace fabric.

[0030] The working principle and process of the antibacterial finishing solution used in this invention are as follows:

[0031] The first step is the hydrolysis reaction of organosilicon quaternary ammonium salt: Dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride (organosilicon quaternary ammonium salt) hydrolyzes under acidic conditions to generate highly reactive silanol groups. The reaction formula is as follows:

[0032] .

[0033] The second step is the condensation reaction: the silanol groups generated after hydrolysis undergo a dehydration condensation reaction with the hydroxyl groups (Cell-OH) on the cellulose fibers to form stable siloxane covalent bonds. The reaction formula is as follows:

[0034] .

[0035] The third step is the electrostatic adsorption of chitosan quaternary ammonium salt: chitosan quaternary ammonium salt molecules carry a positive charge and undergo strong electrostatic adsorption with the negatively charged hydroxyl groups on the fiber surface. At the same time, chitosan quaternary ammonium salts form a dense barrier film through hydrogen bonding.

[0036] The positively charged quaternary ammonium groups of organosilicon quaternary ammonium salts can adsorb negatively charged bacterial cell walls, disrupting their structure and achieving rapid sterilization. Chitosan quaternary ammonium salts, on the other hand, delay microbial attachment and proliferation by forming a physical barrier film, and exhibit stronger inhibitory effects against fungi such as Candida albicans. The two work synergistically to construct a multi-layered antibacterial barrier combining rapid sterilization and long-lasting antibacterial activity. Because the antibacterial agent is fixed to the fiber surface through both covalent bonds and electrostatic adsorption, it will not dissolve during use, thus enabling the substrate to achieve non-leaching and long-lasting antibacterial properties. Furthermore, the antibacterial finishing of this invention does not introduce a large amount of adhesive or alter the physical cross-linking structure between fibers, ensuring the original washability of the substrate.

[0037] In the antibacterial finishing solution used in this invention, organosilicon quaternary ammonium salts chemically bond with the substrate fibers, achieving rapid, non-leaching sterilization and effectively inhibiting bacteria such as Escherichia coli and Staphylococcus aureus. Chitosan quaternary ammonium salts are firmly bound to the fiber surface through electrostatic adsorption, forming a barrier film that provides long-lasting antibacterial and antifungal effects, while also exhibiting biocompatibility and improving skin-friendliness. Citric acid adjusts the pH value of the system, optimizing the hydrolysis of organosilicon quaternary ammonium salts and their binding with fibers, ensuring a more complete reaction and promoting the dissolution and dispersion of chitosan quaternary ammonium salts. Nonionic wetting agents reduce the surface tension of the antibacterial finishing solution, promoting uniform penetration of the finishing solution onto the substrate surface, avoiding antibacterial dead zones, and improving the compatibility between the finishing solution and the substrate, ensuring uniform adhesion after padding without damaging the fiber structure.

[0038] This invention applies an antibacterial finishing solution, a blend of organosilicon quaternary ammonium salt and chitosan quaternary ammonium salt, to a washable spunlace fabric substrate via padding. This ensures uniform antibacterial agent loading and strong bonding, solving the problems of low antibacterial efficiency and uneven antibacterial properties in traditional non-leaching antibacterial processes. The resulting non-leaching antibacterial washable spunlace fabric not only possesses excellent antibacterial properties, but also has antibacterial agents that are dually fixed to the fiber surface through chemical bonding and electrostatic adsorption, making them less prone to migration and non-irritating to the skin. It is especially safe and friendly for infants, pregnant women, menstruating women, and people with sensitive skin.

[0039] In the preparation method of the non-leaching antibacterial washable spunlace fabric of the present invention, the pre-drying step is used to remove free moisture from the surface of the substrate; the baking step is used to allow the antibacterial agent molecules to chemically combine and electrostatically adsorb with the spunlace fabric substrate fibers to achieve non-leaching antibacterial properties; after baking, the spunlace fabric is washed to remove free antibacterial agents that have not been combined with the fibers, and finally dried for shaping to obtain the finished non-leaching antibacterial washable spunlace fabric.

[0040] The preparation method of the non-leaching antibacterial washable spunlace fabric of the present invention has the dual advantages of process and cost: the process is simple, no complex equipment is required, and only conventional wet web forming, spunlace, padding and drying equipment are used, which reduces equipment investment costs; the amount of antibacterial agent used is small, the finishing solution is simple to prepare, the post-processing process is simple, the production efficiency is high, and the production cost is further reduced, which is suitable for large-scale industrial promotion.

[0041] The non-leaching antibacterial washable spunlace fabric obtained by this invention has a non-leaching antibacterial system and has the following advantages compared with the prior art:

[0042] 1. Excellent and stable antibacterial properties: The antibacterial agent is fixed to the fiber through both chemical bonding and electrostatic adsorption, without any antibacterial agent leaching. This avoids the safety hazards caused by leaching antibacterial agents and improves antibacterial durability. The finished product can maintain excellent antibacterial effects even after long-term use. It has high antibacterial efficiency, with antibacterial rates of up to 99.6%, 99.5%, and 98.5% against Escherichia coli, Staphylococcus aureus, and Candida albicans, respectively. The antibacterial effect is significant and long-lasting.

[0043] 2. Excellent washability: The finishing process is gentle and does not change the physical entanglement structure between fibers in the spunlace fabric, nor does it introduce chemical binders that affect dispersion, so the product maintains excellent washability.

[0044] 3. Safe and skin-friendly: Non-leaching antibacterial agents avoid skin irritation caused by antibacterial agent migration; chitosan quaternary ammonium salt has good biocompatibility and moisturizing properties, and non-ionic wetting agents further enhance the skin-friendly feel, making it especially suitable for personal hygiene care scenarios such as infants, sensitive skin, and long-term users. Attached Figure Description

[0045] Figure 1 This is a process flow diagram of the preparation method of the non-leaching antibacterial washable spunlace fabric of the present invention. Detailed Implementation

[0046] The present invention will be further described below with reference to specific embodiments.

[0047] In this specific embodiment, the wood pulp fibers used have a length of 2.0-4.0 mm. The cellulose fibers used are chopped viscose fibers or chopped lyocell fibers, with a length of 8.0-12.0 mm and a linear density of 1.33-1.67 dtex.

[0048] In the specific embodiment, the organosilicon quaternary ammonium salt used is dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride, and the chitosan quaternary ammonium salt used is hydroxypropyltrimethylammonium chloride chitosan, with a molecular weight of 100,000-300,000 Da. The nonionic wetting agent used is fatty alcohol polyoxyethylene ether (AEO-9).

[0049] In this specific embodiment, all water used is deionized water. Deionized water is used as a solvent to prepare fiber slurry and antibacterial finishing solution, avoiding the influence of impurities in the water on fiber dispersion, antibacterial agent dissolution, and antibacterial effect, thus ensuring the stability of the preparation process.

[0050] Example 1

[0051] The preparation method of the non-leaching antibacterial washable spunlace fabric in this embodiment is as follows: Figure 1 As shown, it includes the following steps:

[0052] 1) Substrate preparation:

[0053] Raw material preparation: 75 parts by weight of wood pulp fiber are mixed evenly with 25 parts by weight of chopped viscose fiber in a pulp storage tank and then mixed with water in a pulp mixing tank to make fiber pulp.

[0054] Wet web forming: The fiber slurry is made into a uniform web using a wet web forming process (slurry forming).

[0055] Hydroentangle reinforcement: The fiber web is reinforced using a hydroentangle reinforcement process (hydroentangle composite), and the hydroentanglement pressure is controlled at 3.0MPa to obtain a hydroentangled fabric substrate that can be washed away;

[0056] 2) Antibacterial finishing: The obtained washable spunlace fabric substrate is fed into a dip-and-roll mill, and an antibacterial finishing solution is applied to the substrate through a dip-and-roll process to obtain an antibacterial base fabric; wherein, the temperature of the antibacterial finishing solution (working solution) is 25℃, the speed of the rolling mill is 45m / min, and the rolling pressure is adjusted to control the liquid application rate at 80%;

[0057] The antibacterial finishing solution is composed of the following components at the following concentrations: 20 g / L of composite antibacterial agent, 2 g / L of nonionic wetting agent, and the remainder being citric acid and water; the pH of the antibacterial finishing solution is adjusted to 6.0 by citric acid; the composite antibacterial agent is a mixture of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and hydroxypropyltrimethylammonium chloride chitosan in a mass ratio of 1.5:1.

[0058] 3) Post-processing: The obtained antibacterial base fabric is placed in a pre-drying oven and pre-dried at 85℃ for 3 minutes. Then it is placed in a baking oven and baked at 130℃ for 45 seconds. The base fabric is then washed twice in deionized water in a washing tank, with each washing time being 5 minutes. Finally, the washed base fabric is placed in a drying oven and dried at 190℃ until the moisture content is ≤10% to set its shape. After rewinding, inspection, slitting, and winding, the non-leaching antibacterial washable spunlace fabric is obtained.

[0059] In the resulting non-leaching antibacterial washable spunlace fabric, the mass fraction of the composite antibacterial agent is 2.0%.

[0060] Example 2

[0061] The preparation method of the non-leaching antibacterial washable spunlace fabric in this embodiment includes the following steps:

[0062] 1) Substrate preparation:

[0063] Raw material preparation: 70 parts by weight of wood pulp fiber are mixed evenly with 30 parts by weight of chopped viscose fiber in a pulp storage tank and then mixed with water in a pulp mixing tank to make fiber pulp.

[0064] Wet web forming: The fiber slurry is made into a uniform web using a wet web forming process (slurry forming).

[0065] Hydroentangle reinforcement: The fiber web is reinforced using a hydroentangle reinforcement process (hydroentangle composite), and the hydroentanglement pressure is controlled at 3.5MPa to obtain a hydroentangled fabric substrate that can be washed away;

[0066] 2) Antibacterial finishing: The obtained washable spunlace fabric substrate is fed into a dip-and-roll mill, and an antibacterial finishing solution is applied to the substrate through a dip-and-roll process to obtain an antibacterial base fabric; wherein, the temperature of the antibacterial finishing solution (working solution) is 20℃, the speed of the rolling mill is 30m / min, and the rolling pressure is adjusted to control the liquid application rate at 83%;

[0067] The antibacterial finishing solution is composed of the following components at the following concentrations: 15 g / L of composite antibacterial agent, 1.5 g / L of nonionic wetting agent, and the remainder being citric acid and water; the citric acid adjusts the pH of the antibacterial finishing solution to 5.0; the composite antibacterial agent is a mixture of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and hydroxypropyltrimethylammonium chloride chitosan in a mass ratio of 1:1.

[0068] 3) Post-processing: The obtained antibacterial base fabric is first placed in a pre-drying oven and pre-dried at 70℃ for 4 minutes, then placed in a baking oven and baked at 120℃ for 60 seconds. Then, the base fabric is placed in a water washing tank and washed twice in deionized water, each time for 5 minutes. Finally, the washed base fabric is placed in a drying oven and dried at 180℃ until the moisture content is ≤10% to set its shape. After rewinding, inspection, slitting, and winding, the non-leaching antibacterial washable spunlace fabric is obtained.

[0069] In the resulting non-leaching antibacterial washable spunlace fabric, the mass fraction of the composite antibacterial agent is 1.5%.

[0070] Example 3

[0071] The preparation method of the non-leaching antibacterial washable spunlace fabric in this embodiment includes the following steps:

[0072] 1) Substrate preparation:

[0073] Raw material preparation: 80 parts by weight of wood pulp fiber are mixed evenly with 20 parts by weight of chopped viscose fiber in a pulp storage tank and then mixed with water in a pulp mixing tank to make fiber pulp.

[0074] Wet web forming: The fiber slurry is made into a uniform web using a wet web forming process (slurry forming).

[0075] Hydroentangle reinforcement: The fiber web is reinforced using a hydroentangle reinforcement process (hydroentangle composite), and the hydroentanglement pressure is controlled at 2.5MPa to obtain a hydroentangled fabric substrate that can be washed away;

[0076] 2) Antibacterial finishing: The obtained washable spunlace fabric substrate is fed into a dip-and-roll mill, and an antibacterial finishing solution is applied to the substrate through a dip-and-roll process to obtain an antibacterial base fabric; wherein, the temperature of the antibacterial finishing solution (working solution) is 30℃, the speed of the rolling mill is 60m / min, and the rolling pressure is adjusted to control the liquid application rate at 77%;

[0077] The antibacterial finishing solution is composed of the following components at the following concentrations: 30 g / L of composite antibacterial agent, 3 g / L of nonionic wetting agent, and the remainder being citric acid and water; the citric acid adjusts the pH of the antibacterial finishing solution to 7.0; the composite antibacterial agent is a mixture of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and hydroxypropyltrimethylammonium chloride chitosan in a mass ratio of 2.0:1.

[0078] 3) Post-processing: The obtained antibacterial base fabric is first placed in a pre-drying oven and pre-dried at 100℃ for 2 minutes. Then it is placed in a baking oven and baked at 140℃ for 30 seconds. The base fabric is then placed in a water washing tank and washed twice in deionized water, each time for 5 minutes. Finally, the washed base fabric is placed in a drying oven and dried at 200℃ until the moisture content is ≤10% to set its shape. After rewinding, inspection, slitting, and winding, the non-leaching antibacterial washable spunlace fabric is obtained.

[0079] In the resulting non-leaching antibacterial washable spunlace fabric, the mass fraction of the composite antibacterial agent is 2.5%.

[0080] Experimental Example 1

[0081] According to GB / T 15979-2024 "Hygienic Standard for Disposable Sanitary Products", the antibacterial properties of the non-leaching antibacterial washable spunlace fabric products obtained in Examples 1-3 were tested. The test strains were Escherichia coli (ATCC 25922), Staphylococcus aureus (ATCC 6538), and Candida albicans (ATCC 10231). The test methods were the shaking flask method and viable colony counting. The test results are shown in Table 1 below.

[0082] Table 1 Performance test results of the non-leaching antibacterial washable spunlace nonwoven fabrics obtained in Examples 1-3

[0083]

[0084] The test results in Table 1 show that the antibacterial rates of the finished product obtained in the examples against Escherichia coli, Staphylococcus aureus, and Candida albicans are as high as 99.6%, 99.5%, and 98.5%, respectively. The test results indicate that the non-leaching antibacterial washable spunlace fabric of the present invention has excellent antibacterial properties.

[0085] Experiment Example 2

[0086] This experiment tested the non-leaching properties of the non-leaching antibacterial washable spunlace fabric products obtained in Examples 1-3 using the shaking method according to GB / T 15979-2024. The test method was as follows: the spunlace fabric samples were immersed in physiological saline and shaken for 1 hour, and the leachate was used for an inhibition zone test. The results showed that no inhibition zones were observed, proving that the antibacterial agent in the non-leaching antibacterial washable spunlace fabric products obtained in this invention is of the non-leaching type.

[0087] Experimental Example 3

[0088] This experiment tested the flushability of the non-leaching antibacterial flushable spunlace nonwoven fabric products obtained in Examples 1-3, and the results are shown in Table 1. Table 1 shows that the non-leaching antibacterial flushable spunlace nonwoven fabric products of the present invention maintain good flushability and meet the requirements for use with wet toilet paper.

Claims

1. A method for preparing a non-leaching antibacterial flushable hydroentangled fabric, characterized in that, Includes the following steps: 1) Substrate preparation: Wood pulp fiber and cellulose fiber are mixed, water is added to make fiber slurry, and the fiber web is made by wet web forming process. After hydroentangling, the fiber web is reinforced to obtain a washable hydroentangled fabric substrate. 2) Antibacterial finishing: The antibacterial finishing liquid is applied to the obtained washable spunlace fabric substrate by padding to obtain the antibacterial base fabric; The antibacterial finishing solution is composed of the following components at the following concentrations: 10-30 g / L of composite antibacterial agent, 1-3 g / L of nonionic wetting agent, and the remainder being pH adjuster and water; the pH adjuster adjusts the pH of the antibacterial finishing solution to 5.0-7.0; the composite antibacterial agent is a compound of organosilicon quaternary ammonium salt and chitosan quaternary ammonium salt in a mass ratio of 0.3-2.3:

1. 3) Post-treatment: The obtained antibacterial base fabric is first pre-dried at 70-100℃ for 2-4 minutes, then baked at 120-140℃ for 30-60 seconds, and then washed and dried to obtain the non-leaching antibacterial washable spunlace fabric.

2. The method for preparing the non-leaching antibacterial washable spunlace fabric according to claim 1, characterized in that, In step 1), the mass ratio of wood pulp fiber to cellulose fiber is 70-80:20-30.

3. The method for preparing the non-leaching antibacterial washable spunlace fabric according to claim 1, characterized in that, The wood pulp fibers are 2-4 mm long; the cellulose fibers are 8-12 mm long.

4. The method for preparing the non-leaching antibacterial washable spunlace fabric according to claim 1, characterized in that, The cellulose fiber is any one or a combination of viscose fiber and lyocell fiber.

5. The method for preparing the non-leaching antibacterial washable spunlace fabric according to claim 1, characterized in that, The organosilicon quaternary ammonium salt is dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride.

6. The method for preparing the non-leaching antibacterial washable spunlace fabric according to claim 1, characterized in that, The chitosan quaternary ammonium salt is hydroxypropyltrimethylammonium chloride chitosan.

7. The method for preparing the non-leaching antibacterial washable spunlace fabric according to claim 1, characterized in that, The nonionic wetting agent is fatty alcohol polyoxyethylene ether; the pH adjuster is citric acid.

8. The method for preparing the non-leaching antibacterial washable spunlace fabric according to claim 1, characterized in that, The antibacterial finishing in step 2) satisfies the following: the mass fraction of the composite antibacterial agent in the resulting non-leaching antibacterial washable spunlace fabric is 1.5%-2.5%.

9. The method for preparing the non-leaching antibacterial washable spunlace fabric according to claim 1, characterized in that, In step 3), the drying temperature is 180-200℃, and the product is dried until the moisture content is ≤10%.

10. A non-leaching antibacterial spunlace fabric prepared by any one of claims 1-9.

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