Leather antibacterial soaking agent, preparation method and application thereof, and leather soaking method

Abstract

This invention provides a leather antibacterial soaking agent, its preparation method, and its application, as well as a leather soaking method, belonging to the technical field of leather soaking agents. This invention utilizes two anionic surfactants, sodium diisooctyl sulfosuccinate and sodium dodecylbenzenesulfonate, in a composite, and adds chlorhexidine, citric acid, and ethylenediaminetetraacetic acid as composite antibacterial materials. Applied to the leather soaking process, it not only effectively loosens the fibers of the raw hide and provides excellent stretching for the leather, but also penetrates deep into the leather without damaging its surface material and structure, achieving a deep sterilization effect. This saves on subsequent sterilization processes, thereby improving production efficiency and reducing costs.

Description

Technical Field

[0001] This invention relates to the field of leather soaking agent technology, and particularly to a leather antibacterial soaking agent, its preparation method and application, and a leather soaking method. Background Technology

[0002] The preparation stage of leather production and processing includes soaking, hair removal, and liming. The key process is soaking, as the quality of the soaking directly affects subsequent leather production. Traditional soaking methods mainly use water, or water with added preservatives, surfactants, acids, alkalis, salts, and other auxiliaries. This water-only soaking method often accelerates the soaking process by increasing the temperature, which can easily lead to problems such as over-soaking and excessive hydrolysis of leather proteins.

[0003] Meanwhile, the sodium sulfide hair removal process generates a large amount of dissolved hair and semi-dissolved fragments, leading to increased COD, BOD, TSS, and sludge levels in wastewater, resulting in a heavy wastewater treatment load. Therefore, hair-preserving hair removal has become an essential process requirement. Compared to enzymatic hair removal, existing sodium sulfide hair removal methods can reduce emissions, but both have shortcomings: the former does not preserve hair completely, limiting the regeneration of hair resources; the latter is difficult to control, making it challenging to maintain stable leather quality, thus becoming a long-standing problem in the leather industry. Natural collagen has good resistance to various proteases, but this resistance is greatly weakened when raw hides are denatured or partially denatured by acids, alkalis, or salts. Similarly, once raw hides are exposed to alkalis or enzymes, their ability to resist further alkali and enzyme action is further weakened. Under proper handling, hair removal under alkali or enzymatic action can minimize damage to the collagen in the removed hide, meeting leather-making requirements. However, subsequent exposure to alkalis or enzymes makes it difficult to guarantee that the raw hide will not be damaged.

[0004] During the soaking process, the use of acids, alkalis, and salts further weakens the skin's ability to resist the effects of alkalis and enzymes during subsequent hair removal, making it easier to damage the structure of the raw hide. This can result in problems such as loose surface, damaged surface, enlarged pores, and poor shrinkage due to tanning agents after the leather is made.

[0005] In addition, the antibacterial process in existing leather production is often carried out in the later stages of processing, so most existing leather soaking agents do not have antibacterial effects. Summary of the Invention

[0006] In view of this, the present invention aims to provide a leather antibacterial soaking agent, its preparation method and application, and a leather soaking method. The leather antibacterial soaking agent provided by the present invention has good soaking and antibacterial effects, and hardly damages the structure of raw hides.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0008] This invention provides a leather antibacterial water-absorbing agent, comprising the following components in weight percentages:

[0009]

[0010] Preferably, the components include the following components in weight percentage:

[0011]

[0012] Preferably, the viscosity of the leather antibacterial water-impregnating agent is 0.9 to 1.3 cP.

[0013] This invention provides a method for preparing the above-mentioned antibacterial water-absorbing agent for leather, comprising the following steps:

[0014] Sodium dodecylbenzenesulfonate and water were first mixed to obtain a first mixture;

[0015] The first mixture is mixed with sodium diisooctyl sulfosuccinate and chlorhexidine to obtain a second mixture.

[0016] The second mixture is then mixed with citric acid and ethylenediaminetetraacetic acid in a third mixture to carry out an activation reaction, thereby obtaining a leather antibacterial water-absorbing agent.

[0017] Preferably, the first mixing time is 8 to 15 minutes.

[0018] Preferably, the second mixing time is 5 to 10 minutes.

[0019] Preferably, the activation reaction takes 20 to 40 minutes.

[0020] This invention provides the application of the above-mentioned antibacterial water-absorbing agent for leather in water immersion.

[0021] This invention provides a method for soaking leather in water, comprising the following steps:

[0022] Mix the leather, the aforementioned leather antibacterial soaking agent, and water, and then stir and soak the mixture.

[0023] Preferably, the mass of the leather antibacterial water-absorbing agent is 0.3% to 0.9% of the mass of the leather;

[0024] The soaking time is 1 to 2.5 hours.

[0025] This invention provides a leather antibacterial soaking agent, comprising the following components in weight percentages: sodium diisooctyl sulfonate 0.05-0.2%; sodium dodecylbenzenesulfonate 5-11%; chlorhexidine 0.5-1.5%; citric acid 8-11%; ethylenediaminetetraacetic acid 10-15%; and water as the balance. This invention utilizes two anionic surfactants, sodium diisooctyl sulfonate and sodium dodecylbenzenesulfonate, and adds chlorhexidine, citric acid, and ethylenediaminetetraacetic acid as composite antibacterial materials. When applied in the leather soaking process, it not only effectively loosens the fibers of the raw hide and provides excellent stretching for the leather, but also penetrates deep into the leather without damaging its surface material or structure, achieving a deep sterilization effect. This saves on subsequent sterilization processes, thereby improving production efficiency and reducing costs.

[0026] In this invention, the addition of the leather soaking agent during the soaking process allows the large and coarse root hairs to fall off first. The hairs are then filtered out during the liquid exchange process. In the subsequent hair removal and liming processes, a small amount of sulfide (0.3-0.6%) is used to remove the down, achieving the effect of successfully removing hair without damaging the leather grain. This achieves the goal of ensuring subsequent hair removal without damaging the structure of the raw hide, while solving the problem of the heavy wastewater treatment load caused by the large amount of hair-dissolving substances and semi-dissolved fragments precipitated by the sulfide-based hair removal method.

[0027] Furthermore, the leather soaking agent of the present invention, through the synergistic effect of two anionic surfactants, improves its permeability and can greatly shorten the soaking time of raw hides, thereby achieving the effect of effectively shortening the processing time. The simple soaking process in the prior art has poor hair removal effect and long soaking time, while with the addition of the leather soaking agent of the present invention, after soaking for 2 hours, 2 / 3 of the hair can be effectively removed, and the time is shortened by 10 to 15 hours.

[0028] Furthermore, the leather soaking agent of the present invention eliminates the need for the addition of acids, alkalis, salts, or other auxiliaries during the soaking process, thereby reducing the use of other chemical materials and helping to lower energy consumption in the production environment. Simultaneously, the leather soaking agent of the present invention is composed entirely of eco-friendly materials with high biodegradability, which helps to reduce environmental pollution and lower overall costs.

[0029] Based on this, the composite antibacterial materials used—chlorhexidine, citric acid, and EDTA—achieve bactericidal effects on both the surface and interior of leather without affecting the synergistic effect of the two anionic surfactants or damaging the leather surface material. Chlorhexidine is a broad-spectrum antibacterial agent that disrupts the integrity of bacterial cell membranes, leading to the loss of intracellular substances. Chlorhexidine is effective against both Gram-positive and Gram-negative bacteria; therefore, adding it during leather treatment helps prevent bacterial growth and reproduction, maintaining leather hygiene. Citric acid is an organic acid whose main function is to adjust pH. In leather treatment, lowering the pH of the solution can inhibit the growth of certain bacteria and molds. Furthermore, citric acid has a mild bactericidal effect, directly inhibiting microorganisms. EDTA is a chelating agent that forms stable complexes with metal ions (such as calcium and magnesium). In leather treatment, the addition of EDTA helps remove metal ions from the water, which are often essential for bacterial growth. By removing these ions, EDTA indirectly inhibits bacterial growth. These three compounds work together through different mechanisms to effectively inhibit bacterial growth and maintain the hygiene and stability of leather products.

[0030] This invention provides a method for soaking leather in water. The method can complete the soaking process in just 1 to 2.5 hours, thereby improving production efficiency, reducing production costs, and making it suitable for industrial application. Attached Figure Description

[0031] Figure 1 A graph showing the relationship between chlorhexidine dosage and sterilization rate;

[0032] Figure 2 The hair removal effect of using a mixture of leather antibacterial soaking agent and protease. Detailed Implementation

[0033] This invention provides a leather antibacterial water-absorbing agent, comprising the following components in weight percentages:

[0034]

[0035] Unless otherwise specified, all raw materials used in this invention are commercially available.

[0036] The leather antibacterial soaking agent provided by the present invention comprises 0.05-0.2% sodium diisooctyl sulfonate, preferably 0.08-0.12%, and more preferably 0.1%, by weight percentage. In the present invention, the sodium diisooctyl sulfonate is an anionic surfactant material with good emulsifying and penetrating properties.

[0037] The leather antibacterial soaking agent provided by the present invention comprises 5-11% sodium dodecylbenzenesulfonate, preferably 5-8%, by weight percentage. In the present invention, the sodium dodecylbenzenesulfonate is an anionic surfactant material with good surface activity and strong hydrophilicity, which can effectively reduce the tension of the oil-water interface and achieve emulsification.

[0038] In this invention, the sodium diisooctyl sulfosuccinate and sodium dodecylbenzenesulfonate, two anionic surfactants, have a synergistic effect. When mixed, they work together to improve emulsification and wetting properties, thereby achieving the purpose of degreasing and soaking in water and increasing the water absorption rate of raw hides.

[0039] The leather antibacterial soaking agent provided by the present invention comprises 0.5-1.5% chlorhexidine, preferably 0.8-1.2%, and more preferably 1% by weight. In the present invention, the chlorhexidine has antibacterial activity.

[0040] The leather antibacterial soaking agent provided by the present invention comprises 8-11% citric acid, preferably 9-10%, by weight percentage.

[0041] The leather antibacterial soaking agent provided by this invention, by weight percentage, comprises 10-15% ethylenediaminetetraacetic acid (EDTA), more preferably 12-14%. By adding small amounts of citric acid and EDTA, this invention enables chlorhexidine to exert a better antibacterial effect. Chlorhexidine exhibits a better antibacterial effect in acidic environments, mainly due to the following reasons:

[0042] 1. Changes in cell membrane permeability: In an acidic environment, the permeability of bacterial cell membranes changes. This change helps chlorhexidine to penetrate bacterial cell membranes more easily, thereby exerting its antibacterial effect.

[0043] 2. Stability and activity of chlorhexidine: The chemical structure of chlorhexidine is more stable in acidic environments, which means that it is not easily decomposed under acidic conditions, thus maintaining high antibacterial activity.

[0044] 3. Influence of bacterial growth environment: The growth of many bacteria is inhibited in acidic environments, their physiological activity decreases, and their ability to adapt to environmental changes weakens. Under these conditions, bacteria also have reduced resistance to antimicrobial agents, making chlorhexidine more effective.

[0045] 4. Mode of action of chlorhexidine: Chlorhexidine primarily kills bacteria by binding to phospholipids on the bacterial cell membrane, disrupting the membrane's integrity, causing leakage of cell contents, and thus killing the bacteria. In acidic environments, this effect may be enhanced due to changes in cell membrane properties.

[0046] In summary, an acidic environment not only enhances the stability and activity of chlorhexidine, but also makes bacterial cells more susceptible to invasion and destruction, thereby improving the antibacterial effect of chlorhexidine.

[0047] The leather antibacterial soaking agent provided by the present invention comprises the remainder water, by weight percentage.

[0048] In this invention, the leather antibacterial water-absorbing agent is preferably a pale yellow transparent liquid, and the viscosity value of the leather antibacterial water-absorbing agent of this invention is preferably 0.9 to 1.3 cP, more preferably 1.1 cP, and has strong fluidity.

[0049] The looseness of leather fibers and the stretching of leather are usually assessed by the degree of swelling of the leather, which is mainly expressed by the weight gain rate of the leather. It reflects the degree of water absorption caused by the water-soluble growth-promoting swelling of the leather collagen during the soaking process. The leather antibacterial soaking agent provided by the present invention has a better swelling effect and can better achieve the loosening effect on the leather, making it stretch as much as possible. This has a good promoting effect on the subsequent processing of leather.

[0050] This invention provides a method for preparing the above-mentioned antibacterial water-absorbing agent for leather, comprising the following steps:

[0051] Sodium dodecylbenzenesulfonate and water were first mixed to obtain a first mixture;

[0052] The first mixture is mixed with sodium diisooctyl sulfosuccinate and chlorhexidine to obtain a second mixture.

[0053] The second mixture is then mixed with citric acid and ethylenediaminetetraacetic acid in a third mixture to carry out an activation reaction, thereby obtaining a leather antibacterial water-absorbing agent.

[0054] This invention involves first mixing sodium dodecylbenzenesulfonate with water to obtain a first mixture. In this invention, the first mixing is preferably performed by stirring, with the stirring speed preferably being 180–220 rpm, more preferably 200 rpm. In this invention, the temperature of the first mixing is preferably room temperature, and the mixing time is preferably 8–15 min, more preferably 10–12 min.

[0055] After obtaining the first mixture, the present invention further mixes the first mixture with sodium diisooctyl sulfosuccinate and chlorhexidine to obtain a second mixture. In the present invention, the second mixing is preferably performed by stirring, and the stirring speed is preferably 140–170 rpm, more preferably 150 rpm. In the present invention, the temperature of the second mixing is preferably room temperature, and the time is preferably 5–10 min, more preferably 6–8 min.

[0056] After obtaining the second mixture, the present invention further involves a third mixing with citric acid and ethylenediaminetetraacetic acid to conduct an activation reaction, thereby obtaining a leather antibacterial water-absorbing agent. In the present invention, the third mixing is preferably performed by stirring, and the stirring speed is preferably 140–160 rpm, more preferably 150 rpm.

[0057] In this invention, the activation reaction temperature is preferably 20-30°C, and the time is preferably 20-40 min, more preferably 30-33 min.

[0058] This invention provides the application of the above-mentioned antibacterial leather soaking agent in leather soaking. In this invention, the mass of the leather soaking agent is preferably 0.3-0.9% of the mass of the leather, more preferably 0.5-0.8%.

[0059] This invention provides a method for soaking leather in water, comprising the following steps:

[0060] Mix the leather, the aforementioned leather antibacterial soaking agent, and water, and then stir and soak the mixture.

[0061] In this invention, the type of leather is preferably buffalo hide or sheepskin.

[0062] In this invention, the mass of the leather antibacterial soaking agent is preferably 0.3-0.9% of the mass of the leather, more preferably 0.5-0.8%; in this invention, the soaking temperature is preferably 22-28°C, more preferably 25°C, and the soaking time is preferably 1-2.5h, more preferably 1.5-2h.

[0063] The following detailed description, in conjunction with embodiments, provides an antibacterial water-absorbing agent for leather, its preparation method and application, and a method for soaking leather, but these should not be construed as limiting the scope of protection of this invention.

[0064] Examples 1-5

[0065] The raw material composition of the leather antibacterial water-immersion agent in Examples 1 to 5 is shown in Table 1.

[0066] Table 1. Raw material composition (wt%) of the leather antibacterial water-absorbing agents in Examples 1-5

[0067]

[0068] The preparation methods of the leather antibacterial water-absorbing agents in Examples 1-5 are as follows:

[0069] Sodium dodecylbenzenesulfonate was dissolved in water and stirred at 200 rpm for 8 minutes. After this process, sodium diisooctyl sulfosuccinate was added, and the stirring speed was maintained for 11 minutes. Chlorhexidine was then added, and the mixture was stirred at 150 rpm until homogeneous. After 10 minutes, citric acid and ethylenediaminetetraacetic acid were added, and stirring continued for 25 minutes to obtain a leather antibacterial water-absorbing agent.

[0070] Comparative Example 1

[0071] The leather soaking agent of Comparative Example 1 comprises the following components by mass fraction: 0.08% sodium diisooctyl sulfosuccinate, 5% sodium dodecylbenzenesulfonate, 0.05% dodecyl dimethyl benzyl ammonium chloride, 2% anhydrous ethanol, and 92.87% water.

[0072] The preparation method is the same as in Example 1.

[0073] Comparative Example 2

[0074] Compared to Example 1, citric acid and ethylenediaminetetraacetic acid were omitted.

[0075] The preparation method is the same as in Example 1.

[0076] Comparative Example 3

[0077] Citric acid was omitted compared to Example 1.

[0078] The preparation method is the same as in Example 1.

[0079] Comparative Example 4

[0080] Compared to Example 1, ethylenediaminetetraacetic acid was omitted.

[0081] The preparation method is the same as in Example 1.

[0082] Comparative Example 5

[0083] Compared with Example 1, the raw material composition is as follows:

[0084] Sodium diisooctyl sulfosuccinate: 0.04%;

[0085] Sodium dodecylbenzenesulfonate: 4%;

[0086] Chlorhexidine: 0.3%;

[0087] Citric acid: 12%;

[0088] EDTA: 9%;

[0089] Water: 74.66%.

[0090] Comparative Example 6

[0091] Compared to Example 1, the antibacterial ingredient was replaced with 1% chloramphenicol.

[0092] The preparation method is the same as in Example 1.

[0093] Test Example 1: Immersion Experiment

[0094] The leather immersion agents obtained in the examples and comparative examples were subjected to immersion tests, and the methods are as follows:

[0095] Using the same type of cowhide, a piece of leather was taken, weighed, and its mass before immersion in water was obtained. Then, it was placed in a drum, and distilled water was added at room temperature at a solid-liquid ratio of 25% (the ratio of dry leather mass to distilled water mass). Leather soaking agents from Examples 1-5 and Comparative Examples 1-6, each with a dry leather mass fraction of 1%, were added to the system. The drum was stirred for 25 minutes, then stopped and soaked for 2 hours. The leather was then removed, rinsed thoroughly with clean water, and allowed to air dry at room temperature for 2 hours before being weighed again to obtain the mass of the leather after immersion in water. All immersion experiments in this invention were conducted at 20°C, typically between 20 and 30°C. The water temperature had little effect on the immersion rate; a slightly faster immersion rate at higher water temperatures was not significant.

[0096] The immersion effect is calculated based on the mass difference, and the calculation formula is shown in Equation 1. The immersion rate results are shown in Table 2.

[0097] Water absorption rate = (Leather mass after water absorption - Leather mass before water absorption) / Leather mass before water absorption × 100% Equation 1.

[0098] Table 2 Results of Leather Immersion Rate

[0099] Leather soaking agent Immersion rate Leather soaking agent Immersion rate Example 1 72％ Comparative Example 1 65％ Example 2 72％ Comparative Example 2 45％ Example 3 73％ Comparative Example 3 55％ Example 4 74％ Comparative Example 4 57％ Example 5 75％ Comparative Example 5 42％ - - Comparative Example 6 63％

[0100] As can be seen from the experimental results in Table 2, the leather antibacterial water-absorbing agent of the present invention can achieve a water absorption rate of over 70%, with a maximum of 75%.

[0101] Test Example 2 Antibacterial Test

[0102] 1. Select *E. coli*. Prepare leather samples: Obtain leather samples that have not undergone antimicrobial treatment and those that have undergone antimicrobial treatment. Prepare bacterial suspension: Prepare a bacterial suspension under aseptic conditions at a concentration of 10. 6 CFU / mL.

[0103] 2. Inoculation with bacteria: Spread the bacterial suspension evenly onto the leather sample.

[0104] 3. Incubation: Place the inoculated leather samples under suitable temperature and humidity conditions for incubation.

[0105] The incubation time is 4 hours.

[0106] 4. Evaluation of antibacterial effect: Direct counting method: After sampling, culture on a suitable culture medium, then calculate the number of colonies and calculate the sterilization rate.

[0107] Figure 1 This relates to the relationship between the amount of chlorhexidine added and the sterilization rate. Figure 1 It can be seen that, within a certain concentration range, the addition of sodium dodecylbenzenesulfonate can effectively enhance the bactericidal effect of chlorhexidine. This is because sodium dodecylbenzenesulfonate, as a surfactant, can promote the deep penetration of chlorhexidine into the leather, thereby achieving bactericidal effects on both the leather surface and its interior. This indicates that the addition of sodium dodecylbenzenesulfonate in the water-absorbing agent developed in this study promotes the antibacterial effect of chlorhexidine.

[0108] The sterilization rates of different embodiments and comparative examples are shown in Table 3.

[0109] Table 3 Results of leather sterilization rate

[0110] Leather soaking agent Sterilization rate Leather soaking agent Sterilization rate Example 1 99.8％ Comparative Example 1 97.6％ Example 2 99.1％ Comparative Example 2 94.2％ Example 3 99.7％ Comparative Example 3 96.2％ Example 4 99.8％ Comparative Example 4 96.4％ Example 5 99.9％ Comparative Example 5 95.5％ - - Comparative Example 6 93.4％

[0111] As can be seen from Table 3, the bactericidal rate of the leather antibacterial water-immersion agent of the present invention is higher than 99.1%.

[0112] Test Example 3: Hair Removal Effect

[0113] The leather antibacterial soaking agent of Example 1 was used in combination with protease; the leather material was cowhide.

[0114] Group 1: Protease + Soaking Agent;

[0115] Control group 1: Only protease was used;

[0116] Control group 2: Only the soaking agent was used.

[0117] 2. Experimental Design

[0118] Treatment: Mix the soaking agent and protease in a 1:2 ratio.

[0119] Hair removal time: Set different hair removal time points: 30 minutes, 1 hour, 2 hours, to observe the change in hair removal efficiency over time.

[0120] 3. Conduct the experiment

[0121] Leather samples were immersed in solutions from the treatment group and the control group, respectively.

[0122] Samples were taken out at the predetermined time points to observe the hair removal process.

[0123] 4. Result Evaluation

[0124] Hair removal effect: Observe and record the hair removal effect of the leather samples, such as the uniformity and integrity of hair removal.

[0125] The leather finish after 2 hours of treatment is as follows Figure 2 As shown: Figure 2 The left image shows the experimental group (protein + soaking agent), the middle image shows the group using only protease, and the right image shows the original skin treated with only an equal amount of water.

[0126] Depend on Figure 2 As can be seen, the original leather surface has a large number of hairs. Compared with using protease treatment alone, the soaking agent can improve the water absorption effect of the leather. While the leather absorbs water and softens, it is beneficial for the protease to penetrate deeper into the leather layer and into the hair follicle to decompose proteins. This facilitates the removal of hair from the epidermis, thereby improving the hair removal effect of the protease.

[0127] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A leather antibacterial water-absorbing agent, comprising the following components in weight percentages: Sodium diisooctyl sulfosuccinate, 0.15-0.2%; Sodium dodecylbenzenesulfonate 10-11%; Chlorhexidine 1.1~1.5%; Citric acid 10-11%; 12-15% ethylenediaminetetraacetic acid; Water balance; The viscosity of the leather antibacterial water-absorbing agent is 0.9~1.3 cP; The preparation method of the leather antibacterial water-absorbing agent includes the following steps: Sodium dodecylbenzenesulfonate and water were first mixed to obtain a first mixture; The first mixture is mixed with sodium diisooctyl sulfosuccinate and chlorhexidine to obtain a second mixture. The second mixture is mixed with citric acid and ethylenediaminetetraacetic acid in a third mixture to carry out an activation reaction, thereby obtaining a leather antibacterial water-absorbing agent. The activation reaction takes 20-40 minutes.

2. The method for preparing the leather antibacterial water-absorbing agent according to claim 1, comprising the following steps: Sodium dodecylbenzenesulfonate and water were first mixed to obtain a first mixture; The first mixture is mixed with sodium diisooctyl sulfosuccinate and chlorhexidine to obtain a second mixture. The second mixture is mixed with citric acid and ethylenediaminetetraacetic acid in a third mixture to carry out an activation reaction, thereby obtaining a leather antibacterial water-absorbing agent. The activation reaction takes 20-40 minutes.

3. The preparation method according to claim 2, characterized in that, The first mixing time is 8-15 minutes.

4. The preparation method according to claim 2, characterized in that, The second mixing time is 5-10 minutes.

5. The application of the leather antibacterial soaking agent according to claim 1 or the leather antibacterial soaking agent prepared by any one of claims 2 to 4 in leather soaking.

6. A method for soaking leather in water, characterized in that, Includes the following steps: The leather, the antibacterial soaking agent of claim 1 or the antibacterial soaking agent of the leather prepared by any one of claims 2 to 4, and water are mixed and stirred and soaked.

7. The method according to claim 6, characterized in that, The mass of the leather antibacterial water-absorbing agent is 0.3-0.9% of the mass of the leather; The soaking time is 1 to 2.5 hours.

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