Antimicrobial whitening composition, white synthetic leather substrate and preparation method therefor, and antimicrobial synthetic leather

Abstract

Provided in the present invention are an antimicrobial whitening composition, a white synthetic leather substrate and a preparation method therefor, and an antimicrobial synthetic leather. The antimicrobial whitening composition comprises a cationic antimicrobial agent, an antimicrobial organic substance and a solvent, wherein the cationic antimicrobial agent comprises at least one of a polymeric quaternary ammonium compound, polyethyleneimine, chitosan, a biguanide compound and a polymeric biguanide; and the antimicrobial organic substance comprises at least one of a terpene compound and a derivative thereof, a phenolic compound, an essential oil, an antifungal agent, a preservative and a disinfectant. The man-made leather prepared by means of the antimicrobial whitening composition of the present invention has good performance in terms of both long-lasting antimicrobial properties and maintaining a high whiteness.

Description

An antibacterial whitening composition, a white synthetic leather substrate and its preparation method, and an antibacterial synthetic leather. Technical Field

[0001] This invention relates to the field of preparation of antibacterial whitening compositions for synthetic leather, specifically to an antibacterial whitening composition, a white synthetic leather substrate and its preparation method, and an antibacterial synthetic leather. Background Technology

[0002] Artificial leather, also known as synthetic leather, is a multifunctional and sustainable alternative to genuine leather. It has advantages such as low cost, residue-free production, and customizable colors and appearances, and is therefore widely used in many fields such as fashion, automobiles, and interior decoration.

[0003] White leather is one of the most widely used types of artificial leather, and achieving and maintaining the required whiteness and color consistency has become an important indicator of the quality of artificial leather.

[0004] The current process for achieving high whiteness in artificial leather typically involves incorporating pigments or dyes into the leather coating material. Various white pigments and fluorescent whitening compositions are used to achieve the desired whiteness level. Current techniques involve mixing pigments into the coating during the manufacturing process. The pre-mixed coating material is then passed through calendering rollers along with a substrate such as fabric or non-woven material, followed by a curing and drying process. The manufacturing process for artificial leather typically involves four layers: (1) a base fabric, (2) a plastic coating, (3) a pigment / color coating, and (4) a finishing coating. Regardless of the type of plastic coating, such as polyurethane, PVC, or silicone, the color layer or color coating is applied as a thin layer of dispersed colorant. In modern water-based leather coatings, the composition typically comprises 60-70% binder, 20-30% water, 2-4% pigment, and additional additives. The optical properties of the pigment system depend on factors such as the concentration and properties of the pigment and binder. Particle characteristics, including size, distribution, and shape, as well as refractive index and scattering / absorption coefficients, significantly affect the final visual appearance. Pigments can be defined as substances composed of insoluble small particles. Generally, pigments can be classified according to their chemical properties, composition, and characteristics. In modern pigment applications, over 90% of commercial colorants are inorganic, with a global market volume reaching 12 million tons in 2020. White pigments dominate, accounting for approximately 60% of global pigment production. White pigments achieve their optical effects through non-selective or diffuse scattering of visible light. Titanium dioxide (TiO2), including rutile and anatase structures, is an important white pigment in modern industry, possessing a high refractive index. This high reflectivity and strong hiding power give it excellent performance as a white pigment, forming a fundamental element in the current industry of white artificial leather. As an alternative to white pigments, white dyes are used to give artificial leather color through a dyeing process during manufacturing. White dyes are soluble colorants that penetrate artificial leather, producing a more complete and potentially softer appearance compared to pigments. This method achieves a refined aesthetic and is particularly suitable for applications requiring a softer or less opaque white. Manufacturers often combine white dyes with other colorants, or as part of a mixing process, to achieve customized and visually appealing results.

[0005] However, regardless of whether white pigments or dyes are used, current production processes still present several challenges, such as fading, yellowing, or inconsistent color matching. White leather is prone to fading due to exposure to UV radiation, heat, and environmental factors. Furthermore, yellowing is also common in artificial leather, compromising its original pure white appearance. Ensuring color consistency across different batches is a significant challenge; variations in production processes, raw materials, or environmental factors can all lead to differences in the final product. Moreover, current artificial leather faces issues with colorfastness and durability, as the bonding between dyes and materials can affect fading resistance over time.

[0006] Furthermore, the production of white artificial leather often involves chemicals and processes with potentially adverse environmental impacts, such as the use of potentially harmful colorants and additives. From a regulatory perspective, the use of titanium dioxide (TiO2) has been a controversial topic. In 2021, EU authorities reclassified titanium dioxide, classifying substances or mixtures containing 1% or more titanium dioxide particles with an aerodynamic diameter ≤10 micrometers as carcinogenic. Despite significant efforts in developing new products in the inorganic pigment field, no representative pigment has emerged since the mid-1970s. The invention of new pigments faces challenges in terms of effectiveness, cost-effectiveness, and ecological standards.

[0007] Furthermore, with increasing awareness of hygiene and antibacterial properties across various industries, the rise of antibacterial synthetic leather has attracted considerable attention. Those skilled in the art are actively researching the incorporation of antibacterial agents into synthetic leather, using various reagents such as nano-silver particles and copper compounds. However, ensuring the durability of the antibacterial effect and minimizing environmental impact remain key areas for further research.

[0008] Therefore, there is an urgent need to develop an innovative antibacterial whitening composition that can maintain a high level of whiteness and long-lasting disinfection, as well as a compatible synthetic leather manufacturing process to ensure high abrasion resistance without affecting whiteness and color fastness. Summary of the Invention

[0009] The primary objective of this invention is to provide an antibacterial whitening composition that addresses the problems of low whiteness and colorfastness, and short-lasting antibacterial properties in existing antibacterial whitening compositions for artificial leather.

[0010] A second objective of the present invention is to provide a white synthetic leather substrate comprising the aforementioned antibacterial whitening composition, wherein the resulting white synthetic leather substrate can maintain a high level of whiteness and long-lasting antibacterial properties.

[0011] A third objective of this invention is to provide a method for preparing a white synthetic leather substrate, for use in preparing the aforementioned white synthetic leather substrate.

[0012] A fourth objective of the present invention is to provide an antibacterial synthetic leather comprising the aforementioned white synthetic leather substrate.

[0013] To achieve the first objective of this invention, the present invention provides an antibacterial whitening composition comprising a cationic antibacterial agent, an antibacterial organic compound, and a solvent; the cationic antibacterial agent comprises at least one of a polymeric quaternary ammonium compound, polyethyleneimine, chitosan, biguanide compounds, and polymeric biguanide; the antibacterial organic compound comprises at least one of a terpene compound and its derivatives, a phenolic compound, an essential oil, an antifungal agent, a preservative, and a disinfectant.

[0014] As can be seen from the above, using the antibacterial whitening composition of the present invention eliminates the need for additional white pigments and dyes, allowing the material itself to achieve the required whiteness and opacity in the subsequently formed artificial leather. This eliminates the potential carcinogenic risks associated with adding white pigments and dyes, and avoids problems arising during the preparation process using them. It also reduces environmental damage and broadens the application range of the final artificial leather. Furthermore, the antibacterial efficacy of the present invention does not rely on typical metal mechanisms involving silver, copper, or zinc ions. The introduction of a metal-free formulation not only reduces the risk of metal accumulation and absorption in the human body but also helps reduce environmental impact and maintain environmental sustainability by minimizing metal pollution in the ecosystem. Artificial leather prepared using the antibacterial whitening composition of the present invention exhibits excellent performance in both long-lasting antibacterial properties and maintaining high whiteness.

[0015] A further option is that the antibacterial organic compound includes at least one of the following: boric acid derivatives, 4-terpene alcohol, 1,8-cineole, terpinene, terpineol, carvone, carvacrol, camphor, limonene, 2-isopropyl-5-methylphenol, eugenol, p-coumaric acid, tyrosol, tea tree oil, clove oil, nystatin, clotrimazole, ciclopirox ol, itraconazole, and fluconazole.

[0016] A further option is that the solvent includes at least one of water, methanol, ethanol, propanol, glycerol, alkanol, dimethyl sulfoxide, and polyethylene glycol.

[0017] A further option is that the cationic antimicrobial agent includes at least one of polyaminopropyl biguanide, benzalkonium chloride, benzalkonium chloride, polyhexamethylene biguanide, and chlorhexidine.

[0018] As can be seen from the above scheme, the above-mentioned substances are widely available and easy to obtain, harmless to the human body and the environment, and perform excellently in terms of antibacterial properties and whiteness maintenance.

[0019] A further embodiment is that, by weight, the antibacterial whitening composition comprises 15 to 35 parts of a cationic antibacterial agent, 15 to 35 parts of an antibacterial organic compound, and 50 to 66 parts of a solvent.

[0020] As can be seen from the above scheme, the antibacterial whitening composition prepared according to the above proportions exhibits good antibacterial properties against a range of microorganisms, including bacteria, fungi, and viruses. The final antibacterial synthetic leather can achieve a specified whiteness value of 60 to 90, and maintains high antibacterial activity against various microorganisms after aging.

[0021] To achieve the second objective of this invention, the present invention provides a white synthetic leather substrate comprising an organosilicon material and an antibacterial whitening composition, wherein the organosilicon material is an organosilicon material containing polysiloxane, and the antibacterial whitening composition is an antibacterial whitening composition as described in any of the above embodiments.

[0022] As can be seen from the above scheme, the white synthetic leather substrate silicone material of the present invention has excellent whiteness and opacity properties, and also has certain antibacterial properties. Moreover, the silicone material is widely available and can be room temperature vulcanizing silicone, high temperature vulcanizing silicone and liquid silicone rubber. It has various curing systems, such as peroxide-based and platinum-based catalytic systems, and is easy to obtain. The antibacterial whitening composition has a wide range of applications.

[0023] A further option is that, by weight percentage, the white synthetic leather substrate contains 1% to 8% of an antibacterial whitening composition.

[0024] As can be seen from the above scheme, the excellent properties of synthetic leather can be achieved with a small amount of antibacterial whitening composition added, and the preparation cost is low.

[0025] A further option is that, by weight percentage, the white synthetic leather substrate also contains 0% to 1% additives, which are at least one of curing agents, plasticizers, stabilizers, fillers, antioxidants, crosslinking agents, and flame retardants.

[0026] As can be seen from the above scheme, the addition of the above additives further improves the performance of white synthetic leather substrate, making the white synthetic leather substrate applicable to a wider range of fields.

[0027] To achieve the third objective mentioned above, the present invention provides a method for preparing a white synthetic leather substrate. The white synthetic leather substrate is any of the white synthetic leather substrates described above. The preparation method includes the following steps: preparation of an antibacterial whitening composition: at a temperature of 55°C to 65°C, a cationic antibacterial agent and an antibacterial organic compound are added to a solvent and stirred until homogeneous to obtain an antibacterial whitening composition; preparation of an organosilicon material: the organosilicon component is mixed with an additive and stirred until homogeneous to obtain an organosilicon material, wherein the additive is a vulcanizing agent and / or a catalyst; preparation of a white synthetic leather substrate: the antibacterial whitening composition, the organosilicon material, and the additive are mixed and stirred until homogeneous, then placed in a mold and allowed to cure. After curing, the mixture is removed to obtain a white synthetic leather substrate.

[0028] As can be seen from the above scheme, the method for preparing white synthetic leather substrate of the present invention is simple and easy to operate, and the white synthetic leather substrate obtained is consistent in color between different batches and is not prone to yellowing or fading.

[0029] To achieve the fourth objective mentioned above, the present invention provides an antibacterial synthetic leather comprising a supplementary layer and a white synthetic leather layer, wherein the white synthetic leather layer is a white synthetic leather substrate as described in any of the above embodiments, and the supplementary layer is at least one of a knitted layer, a woven layer, a non-woven layer, and a fiber layer.

[0030] As can be seen from the above solutions, the antibacterial synthetic leather of the present invention is suitable for various industries, including but not limited to fashion, automobiles, interior decoration, and accessories. It has the advantages of being aesthetically pleasing, having excellent and long-lasting antibacterial effects. Attached Figure Description

[0031] Figure 1 is a schematic diagram of the connection method between the antibacterial synthetic leather supplement layer and the white synthetic leather layer of the present invention.

[0032] Figure 2 is a schematic diagram of the preparation process of the white synthetic leather substrate of the present invention.

[0033] Figure 3 is a schematic diagram of the process of testing whiteness and opacity using the refractometer of the present invention.

[0034] Figure 4 is a schematic diagram of the stacking process of the present invention.

[0035] Figure 5 is a trend graph showing the changes in whiteness and opacity of Formulation 1 relative to the active concentration.

[0036] Figure 6 is a trend graph showing the changes in whiteness and opacity of Formulation 2 relative to the active concentration.

[0037] Figure 7 is a trend graph showing the changes in whiteness and opacity of Formulation 3 relative to the active concentration.

[0038] Figure 8 is a trend graph showing the changes in whiteness and opacity of Formulation 4 relative to the active concentration.

[0039] Figure 9 is a trend graph showing the changes in whiteness and opacity of Formulation 5 relative to the active concentration.

[0040] Figure 10 is a trend graph showing the changes in whiteness and opacity of Formulation 6 relative to the active concentration.

[0041] Figure 11 is a trend graph showing the changes in whiteness and opacity of Formulation 7 relative to the active concentration.

[0042] Figure 12 is a trend graph showing the changes in whiteness and opacity of Formulation 8 relative to the active concentration.

[0043] Figure 13 is a trend graph showing the changes in whiteness and opacity of Formulation 9 relative to the active concentration.

[0044] Figure 14 is a trend graph showing the changes in whiteness and opacity of Formulation 10 relative to the active concentration. Detailed Implementation

[0045] The antibacterial synthetic leather provided by this invention includes a supplementary layer and a white synthetic leather layer. The supplementary layer is at least one of a knitted layer, a woven layer, a non-woven layer, and a fiber layer. Preferably, the supplementary layer can be one of a woven fabric, a knitted fabric, and a non-woven fabric, and the material of the supplementary layer can be polyester fiber, nylon, natural fiber, etc. The supplementary layer can be obtained by means well known to those skilled in the art, and the connection method between the supplementary layer and the white synthetic leather layer is also a connection method and technique well known to those skilled in the art. As shown in Figure 1, the supplementary layer 12 and the white synthetic leather layer 11 can be joined together by a lamination process.

[0046] White synthetic leather silicone material and antibacterial whitening composition. The white synthetic leather substrate contains 1% to 8% of the antibacterial whitening composition by weight. Further, the white synthetic leather substrate also contains 0% to 1% of additives, which are at least one selected from the group consisting of a curing agent, plasticizer, stabilizer, filler, antioxidant, crosslinking agent, and flame retardant. Preferably, the additive is a curing agent.

[0047] The organosilicon material is a polysiloxane-containing organosilicon material. Organosilicon materials are those well-known to those skilled in the art, and specifically, they can be room-temperature vulcanizing organosilicon, high-temperature vulcanizing organosilicon, and liquid silicone rubber, possessing various curing systems, such as peroxide-based and platinum-based catalytic systems. All of the above-mentioned organosilicon materials can be commercially available, or the raw materials for their preparation can be commercially available. The raw materials for preparing organosilicon materials are organosilicon components and additives, with the additives being vulcanizing agents and / or catalysts. The preparation methods and reaction conditions for organosilicon materials are also well-known to those skilled in the art.

[0048] By weight, the antibacterial whitening composition comprises 15 to 35 parts of a cationic antibacterial agent, 15 to 35 parts of an antibacterial organic compound, and 50 to 66 parts of a solvent.

[0049] Cationic antibacterial agents include at least one of polymeric quaternary ammonium compounds, polyethyleneimine, chitosan, biguanides, and polymeric biguanides. Specifically, cationic antibacterial agents include at least one of polyaminopropyl biguanide, benzalkonium chloride, benzalkonium chloride, polyhexamethylene biguanide, and chlorhexidine.

[0050] Antimicrobial organic compounds include at least one of the following: terpenoids and their derivatives, phenolic compounds, essential oils, antifungal agents, preservatives, and disinfectants. Specifically, antimicrobial organic compounds include at least one of the following: boric acid derivatives, 4-terpene alcohols, 1,8-cineole, terpinene, terpineol, carvone, carvacrol, camphor, limonene, 2-isopropyl-5-methylphenol, eugenol, p-coumaric acid, tyrosol, tea tree oil, clove oil, nystatin, clotrimazole, ciclopirox ol, itraconazole, and fluconazole.

[0051] Solvents include at least one of water, methanol, ethanol, propanol, glycerol, alkanol, dimethyl sulfoxide, and polyethylene glycol.

[0052] The aforementioned cationic antibacterial agents, antibacterial organic compounds, and solvents can all be obtained commercially.

[0053] Referring to Figure 2, the preparation method of the above-mentioned white synthetic leather substrate includes the following steps: Preparation of antibacterial whitening composition C: At a temperature of 55°C to 65°C, preferably at a temperature of 60°C, cationic antibacterial agent and antibacterial organic matter are added to a solvent and stirred and mixed evenly to obtain antibacterial whitening composition C (i.e., C in step S3); Preparation of organosilicon material (i.e., steps S1 and S2): The organosilicon component is mixed with an additive and stirred evenly to obtain organosilicon material, wherein the additive is a vulcanizing agent and / or catalyst; Preparation of white synthetic leather substrate: The antibacterial whitening composition C, organosilicon material and additive are mixed (i.e., step S4), stirred evenly, and placed in a mold for curing (i.e., step S5). After curing is completed, it is taken out to obtain white synthetic leather substrate.

[0054] The organosilicon component can be composed of two components that need to be mixed, as shown in Figure 1, namely organosilicon component A and organosilicon component B, or it can be organosilicon that does not need to be mixed. All the organosilicon components mentioned above are commercially available, and there are no requirements for the specific formula. It is only necessary to ensure that the prepared organosilicon is an organosilicon material containing polysiloxane.

[0055] The curing process specifically includes step S6: placing the mold in a vacuum oven and evacuating it for 10 minutes to eliminate air bubbles and increase material density. Step S7: then removing excess material to refine the final product. Step S8: finally, a controlled curing process is carried out in a vacuum oven at 70°C for 3 hours to ensure proper cross-linking and curing of the silicone material, guaranteeing the strength and consistency of the white synthetic leather substrate.

[0056] It should be noted that the prepared antibacterial whitening composition should be used within three months.

[0057] The present invention will be further described below with reference to specific embodiments. A white synthetic leather substrate was prepared according to Table 1 below.

[0058] Table 1

[0059] Testing of white synthetic leather substrate

[0060] Multiple groups of white synthetic leather substrates were prepared by adding the antibacterial whitening compositions from formulations 1 to 10 at amounts ranging from 0% to 8%. Whiteness and opacity tests were performed on these white synthetic leather substrates according to standards R457 and ISO 2471:2008. It should be noted that, to ensure the elimination of environmental variations and maintain data consistency, whiteness measurements were performed independently on six samples from the same batch. Simultaneously, both surfaces (top and bottom) of the samples were examined to verify the uniform distribution of the formulation. Opacity determination involved evaluating the inherent monolithic brightness factor R0 and brightness factor R∞ recorded on the six-layer material.

[0061] Referring to Figure 3, the specific testing process is as follows:

[0062] Steps 1a and 1b constitute the initial stage involving the calibration of the refractometer, which is crucial for ensuring measurement accuracy. This step involves calibrating the instrument using a standard black cavity (R457 = 0.0) and a white standard (R457 = 80.0). This meticulous calibration establishes a reliable baseline for accurate whiteness and opacity assessment.

[0063] Step 2 involves measuring the single-piece brightness factor of the top and bottom surfaces of all samples.

[0064] Steps 3a and 3b are used to measure the intrinsic brightness factor R∞ using six stacked samples.

[0065] Referring to Figure 4, the stacking process involves placing the top layer at the bottom for additional measurements, and repeating this process for each layer, resulting in six different results (i.e., steps 3c and 3d). The same procedure is performed on the back side, producing another six results. The average intrinsic luminance factor is calculated as the average of these twelve results. The monolithic luminance factor (R0) is measured using a monolayer material with a black cavity (R457 = 0) as a backing. The opacity is then calculated as the ratio of the monolithic luminance factor to the intrinsic factor. This method ensures a robust assessment of the whiteness and opacity properties of white synthetic leather substrates, taking into account both the surface and multiple layers to comprehensively examine their optical characteristics. Specific test results are shown in Table 2 below.

[0066] Table 2

[0067] The whiteness and opacity of the antibacterial whitening compositions at different concentrations according to formulations 1 to 10 were plotted relative to the concentration of the added antibacterial whitening composition (i.e., the active concentration), resulting in Figures 5 to 14. It can be seen that whiteness and opacity increase proportionally with the concentration of the antibacterial whitening composition. This demonstrates a direct correlation between the concentration of the antibacterial whitening composition and the optical properties of the white synthetic leather substrate. Adding the antibacterial whitening composition of this invention can improve both whiteness and opacity. The white synthetic leather substrate exhibits a specified whiteness value ≤60 and an opacity index ≤80.

[0068] The white synthetic leather substrate prepared by adding 6% of the above formulation 8 was tested at the Guangdong Provincial Center for Microbiology in accordance with ISO 22196:2011 standard. The results showed that after 24 hours of contact with the white synthetic leather substrate sample, the microbial activity of Trichophyton rubrum was reduced by more than 99.9%, further demonstrating that the white synthetic leather substrate of the present invention has antibacterial activity ≥99.9% against Gram-positive and Gram-negative bacteria.

[0069] Testing of antibacterial synthetic leather: A white synthetic leather substrate prepared by adding 1% to 8% of the above formulation of antibacterial whitening composition is pressed onto a knitted fabric to obtain antibacterial synthetic leather. The antibacterial synthetic leather tested has a specified whiteness value of 60 to 90, and in some schemes, the whiteness index reaches 89.9.

[0070] The physical properties of the antibacterial synthetic leather were tested according to relevant standards. The tensile strength in all directions of the antibacterial synthetic leather was found to be ≥24 N / mm². 2 The leather exhibits a tear strength ≥40N in all directions, no color change after 20,000 bends in all directions, an adhesion value ≥2.6N / 10mm to the leather substrate, and no significant damage or peeling in the abrasive area after 10,000 rubs with a CS-10 abrasive wheel under a 1000g load. Color fastness to dry, wet, and sweat rubbing reaches 4-5. It passes the flammability test, has an air permeability of 0.9mm / s, a hydrostatic head resistance ≥40,000mm, and passes chemical residue testing, including formaldehyde content testing, SVHC screening testing, and phthalate content testing. The test results for the antibacterial synthetic leather prepared from formulation 8 (with an antibacterial whitening composition addition of 6%) are shown in Tables 3 and 4 below.

[0071] Table 3

[0072] Table 4

[0073] The antibacterial synthetic leather prepared by Formula 8 with an antibacterial whitening composition of 6% was tested for antibacterial properties according to ISO 22196:2011 standard, as shown in Table 5 below.

[0074] Table 5

[0075] It can be seen that the bacterial content was significantly reduced after contact with the antibacterial synthetic leather samples. Notably, Staphylococcus aureus was reduced by 99.99%, and Escherichia coli by 99.999%. After the initial test, the samples were aged for 36 months under simulated laboratory conditions in the same testing laboratory. Subsequently, the antibacterial synthetic leather was tested for Staphylococcus aureus and Escherichia coli strains according to ISO 22196:2011 standard. The results showed that after aging, the bacterial content continued to decrease by more than 99.9%.

[0076] In addition, according to the ISO21702:2019 method, the antiviral properties of the antimicrobial synthetic leather prepared by formulation 8 with an addition amount of 6% of the above antimicrobial whitening composition were evaluated using human coronavirus HCoV-229E (ATCC VR-740), as shown in Table 6 below.

[0077] Table 6

[0078] It can be seen that the antiviral activity was 96.0% after 2 hours of contact, and increased to 99.7% after 6 hours of contact. This indicates that the antibacterial synthetic leather of the present invention can be applied in the field of sanitary materials.

[0079] To verify that the antimicrobial synthetic leather of the present invention can be applied to various fields, such as 1) automotive parts, (2) clothing and textiles, (3) fashion accessories, (4) furniture interiors, (5) footwear, and (6) wearable technology interiors. These environments encompass diverse settings, such as shopping malls, universities, clinics, and hospitals. Furniture made from the antimicrobial synthetic leather prepared using formulation 8 with an antimicrobial whitening composition of the present invention at a concentration of 6% was placed in a crowded shopping mall for a three-month field trial. To mitigate the potential impact of the inherent antimicrobial properties of the original furniture (using ordinary commercially available leather) and differences in material type, a control sample made of the same material as the treated furniture but lacking the antimicrobial whitening composition was introduced at the test site.

[0080] The specific testing method involved four environmental inspections conducted by a third-party laboratory using swab testing. Environmental swab analysis followed the official AOAC methodology, employing 3M Petrifilm (a reliable method for assessing surface bacterial content). On-site sampling was conducted after the weekend peak hours (10 PM), managed by an independent third-party laboratory, with routine cleaning suspended for 10 hours. The assessment included three basic indicators: aerobic colony count (AOAC 990.12, 2016), Escherichia coli quantification (AOAC 991.14, 2016), and Staphylococcus aureus (AOAC 2003.07, 2016). Specific test results are shown in Table 7 below.

[0081] Table 7

[0082] It can be seen that the average bacterial count in the treatment group was significantly lower than that in the control group, from 7.64 CFU / cm³. 2 (N=26, pre-test sampling, 15% trimmed) decreased to 4.32 CFU / cm³ 2 (N = 30 x 3, compared to the original furniture material, trimmed by 15% at 2-3 week intervals). Similarly, the median is 5.2 CFU / cm². 2 (N=26, pre-test sampling) decreased to 0.7 CFU / cm³ 2 (N = 30 x 3, sampling three times, with an interval of 2-3 weeks). Compared with the control group, after two samplings, the pruned average showed an increase from 21.96 CFU / cm². 2 (N = 15 x 2, sampling twice every 3 weeks, pruning by 15%) reduced to 4.32 CFU / cm² 2 (N = 30 × 3, sampling three times, with an interval of 3 weeks).

[0083] Because the generally accepted microbial standard for surface bacterial content in hospital environments is typically <2.5 CFU / cm³. 2 Up to <5 CFU / cm 2 Within the specified range. The above experimental data demonstrate that the antibacterial synthetic leather using this invention can exhibit a high level of cleanliness comparable to that of a hospital environment.

[0084] In summary, the present invention enables the production of white synthetic leather substrates using an antibacterial whitening composition without the need for traditional white dyes or pigments. The resulting antibacterial synthetic leather exhibits excellent performance in both long-lasting antibacterial properties and maintenance of high whiteness. It can be applied to a wide range of fields, including but not limited to automotive parts, clothing and textiles, fashion accessories, furniture upholstery, footwear, and automotive interiors.

[0085] The above embodiments are merely preferred examples of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles of the present invention in accordance with the claims of the present invention should be included within the scope of the present invention patent application.

Claims

1. An antibacterial whitening composition, characterized in that: The antibacterial whitening composition includes a cationic antibacterial agent, an antibacterial organic compound, and a solvent; The cationic antibacterial agent includes at least one of the following: polymeric quaternary ammonium compounds, polyethyleneimine, chitosan, biguanide compounds, and polymeric biguanides; The antibacterial organic compounds include at least one of terpenoids and their derivatives, phenolic compounds, essential oils, antifungal agents, preservatives, and disinfectants.

2. The antibacterial whitening composition according to claim 1, characterized in that: The antibacterial organic compounds include at least one of the following: boric acid derivatives, 4-terpene alcohol, 1,8-cineole, terpinene, terpineol, carvone, carvacrol, camphor, limonene, 2-isopropyl-5-methylphenol, eugenol, p-coumaric acid, tyrosol, tea tree oil, clove oil, nystatin, clotrimazole, ciclopirox ketone, itraconazole, and fluconazole.

3. The antibacterial whitening composition according to claim 1, characterized in that: The solvent includes at least one of water, methanol, ethanol, propanol, glycerol, alkanol, dimethyl sulfoxide, and polyethylene glycol.

4. The antibacterial whitening composition according to claim 1, characterized in that: The cationic antibacterial agent includes at least one of polyaminopropyl biguanide, benzyl chloride, benzalkonium chloride, polyhexamethylene biguanide, and chlorhexidine.

5. An antibacterial whitening composition according to any one of claims 1 to 4, characterized in that: By weight, the antibacterial whitening composition comprises 15 to 35 parts of the cationic antibacterial agent, 15 to 35 parts of the antibacterial organic compound, and 50 to 66 parts of the solvent.

6. A white synthetic leather substrate, characterized in that: The white synthetic leather substrate comprises an organosilicon material and an antibacterial whitening composition, wherein the organosilicon material is an organosilicon material containing polysiloxane, and the antibacterial whitening composition is an antibacterial whitening composition as described in any one of claims 1 to 5.

7. The white synthetic leather substrate as described in claim 6, characterized in that: The white synthetic leather substrate contains 1% to 8% of the antibacterial whitening composition by weight percentage.

8. A white synthetic leather substrate as described in claim 6 or 7, characterized in that: The white synthetic leather substrate also contains 0% to 1% additives by weight percentage, wherein the additives are at least one of curing agents, plasticizers, stabilizers, fillers, antioxidants, crosslinking agents, and flame retardants.

9. A method for preparing a white synthetic leather substrate, characterized in that, The white synthetic leather substrate is a white synthetic leather substrate as described in claims 6 to 8, and the preparation method includes the following steps: Preparation of the antibacterial whitening composition: At a temperature of 55°C to 65°C, a cationic antibacterial agent and an antibacterial organic compound are added to a solvent and stirred until homogeneous to obtain the antibacterial whitening composition; Preparation of organosilicon materials: The organosilicon components are mixed with additives and stirred evenly to obtain the organosilicon materials, wherein the additives are vulcanizing agents and / or catalysts; Preparation of white synthetic leather substrate: The antibacterial whitening composition, the organosilicon material and the additive are mixed and stirred evenly, then placed in a mold and left to cure. After curing, the mixture is removed to obtain the white synthetic leather substrate.

10. An antibacterial synthetic leather, characterized in that: The antibacterial synthetic leather includes a supplementary layer and a white synthetic leather layer, wherein the white synthetic leather layer is a white synthetic leather substrate as described in any one of claims 6 to 8, and the supplementary layer is at least one of a knitted layer, a woven layer, a non-woven layer, and a fiber layer.

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