Silica gel leather and preparation method thereof

Abstract

The invention relates to silica gel leather and a preparation scheme thereof. The silica gel leather comprises the following components: silicone rubber; the copper-loaded titanium dioxide nanoparticles are titanium dioxide nanoparticles of which the surfaces are loaded with a copper compound, and the copper compound comprises at least one of a copper oxide and a copper hydroxide; and polyvinyl alcohol containing amino groups. The silica gel leather provided by the invention comprises the copper-loaded titanium dioxide nanoparticles and the amino-containing polyvinyl alcohol, the copper-loaded titanium dioxide nanoparticles do not cause yellowing of the silica gel leather while resisting bacteria and viruses, and the amino-containing polyvinyl alcohol can significantly increase the dispersion uniformity of copper oxide in silicon rubber, so that the silica gel leather is more resistant to bacteria and viruses. Equivalently, the dispersity of the copper oxide is improved.

Description

Technical Field

[0001] The present invention relates to leather products, in particular to artificial leather. Background Art

[0002] At present, new energy vehicles are developing more and more rapidly, and their styling designs are becoming more and more varied. Many customers' demands for car interiors are transitioning from the early dark colors to bright light colors. However, with the popularity of light-colored interiors, how to solve the pain point that light colors are easy to get dirty has become an important development direction for light-colored interiors. Due to its special surface properties, silicone rubber has a certain resistance to most pollution sources, but its large pore structure means that once pollutants adhere to the surface, if they are not cleaned in time, the pollutants can easily penetrate into the interior of the material, making it difficult to clean. In addition, the large pores of silicone rubber also make it easier to adsorb viruses and provide a source of energy for bacteria to reproduce. Studies have shown that ordinary silicone rubber has more bacteria adhering to the surface, while specially treated silicone rubber (such as carbon-silicone rubber) exhibits lower bacterial adhesion. Therefore, silicone rubber as a car interior poses a great health and hygiene risk.

[0003] To mitigate the health risks posed by silicone rubber used in automotive interiors, existing technologies utilize silver ion implantation to modify the surface of silicone rubber to enhance its antimicrobial properties and biocompatibility. However, silver ions are expensive to use and can easily cause yellowing of the silicone leather. Furthermore, silver ions are poorly dispersed in silicone rubber, resulting in uneven and more pronounced yellowing. Furthermore, the lack of silver ions can lead to the accumulation of microorganisms in certain areas of the silicone rubber automotive interior surface. Summary of the Invention

[0004] The embodiments of the present application provide a silicone leather and a preparation method thereof to solve the technical problems of yellowing of the silicone leather caused by silver ions and poor dispersion of silver ions in the silicone leather.

[0005] In a first aspect, an embodiment of the present application provides a silicone leather, wherein the silicone leather comprises the following components:

[0006] Silicone rubber;

[0007] Copper-loaded titanium dioxide nanoparticles, wherein the copper-loaded titanium dioxide nanoparticles are titanium dioxide nanoparticles with a copper compound loaded on the surface, wherein the copper compound includes at least one of copper oxide and copper hydroxide;

[0008] Polyvinyl alcohol containing amino groups.

[0009] In some embodiments of the present application, the silicone leather further includes zinc oxide nanoparticles.

[0010] In some embodiments of the present application, the silicone leather further includes sodium polyacrylate.

[0011] In some embodiments of the present application, the silicone rubber is methyl vinyl silicone rubber.

[0012] In some embodiments of the present application, the silicone leather further comprises copper pyrithione.

[0013] In some embodiments of the present application, the silicone leather also includes graphene.

[0014] In some embodiments of the present application, the silicone leather comprises, in terms of mass percentage of the silicone leather:

[0015] 60% to 70% methyl vinyl silicone rubber, 6% to 10% nano zinc oxide, 6% to 10% copper-loaded titanium dioxide nanoparticles, 5% to 8% copper pyridinethione, 5% to 8% vulcanizing agent, 0.3% to 0.5% high hydrogen silicone oil, 0.5% to 0.8% platinum catalyst, and 5% to 8% amino-containing polyvinyl alcohol.

[0016] In some embodiments of the present application, the vulcanizing agent is at least one of 2,5-dimethyl-2,5-di-tert-butyl peroxyhexane, trimethylolpropane trimethacrylate or dicumyl peroxide.

[0017] In a second aspect, an embodiment of the present application provides a method for preparing silicone leather, wherein the silicone leather is the silicone leather described in any embodiment of the first aspect, and the method comprises the following steps:

[0018] Mixing raw materials corresponding to all components of the silicone leather to obtain a liquid silicone mixture;

[0019] Providing release paper and base fabric, coating the liquid silicone mixture on the release paper and then laminating it with the base fabric to obtain prefabricated leather;

[0020] The prefabricated leather is subjected to a vulcanization treatment to obtain the silica gel leather.

[0021] In some embodiments of the present application, the temperature of the vulcanization treatment is 130-150° C.; and / or,

[0022] The time of the vulcanization treatment is 8 to 15 minutes.

[0023] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0024] According to the silicone leather provided in the embodiment of the present application, it contains a special combination of ingredients, namely copper-loaded titanium dioxide nanoparticles and polyvinyl alcohol containing amino groups. This copper-loaded titanium dioxide nanoparticles not only have the dual effects of antibacterial and antiviral, but also will not cause yellowing of the silicone leather during use, thereby maintaining the aesthetics and practicality of the silicone leather. On the other hand, polyvinyl alcohol containing amino groups plays a vital role in silicone leather. It can significantly improve the uniformity of the dispersion of copper oxide in the silicone rubber matrix. This uniform dispersion means that copper oxide can be more evenly distributed in various parts of the silicone leather, thereby enhancing the overall antibacterial and antiviral effects of the silicone leather. In short, through this unique formula, silicone leather can not only provide lasting protection, but also maintain its excellent physical and chemical properties, ensuring the long-term stability and reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 A schematic flow chart of a method for preparing silicone leather provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] Unless otherwise specified, the terms used herein should be understood as commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. In the event of any conflict, the present specification shall take precedence.

[0030] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0031] Currently, there are technical problems in silicone leather containing silver ions, such as yellowing of the silicone leather caused by silver ions and poor dispersion of silver ions in the silicone leather.

[0032] The technical solutions provided in the embodiments of this application are intended to solve the above technical problems, and the overall idea is as follows:

[0033] In a first aspect, an embodiment of the present application provides a silicone leather, wherein the silicone leather comprises the following components:

[0034] Silicone rubber;

[0035] Copper-loaded titanium dioxide nanoparticles, wherein the copper-loaded titanium dioxide nanoparticles are titanium dioxide nanoparticles with a copper compound loaded on the surface, wherein the copper compound includes at least one of copper oxide and copper hydroxide;

[0036] Polyvinyl alcohol containing amino groups.

[0037] The copper-loaded titanium dioxide nanoparticles themselves have bactericidal properties. The copper oxide loaded on their surface not only exhibits a bactericidal effect but also effectively inactivates viruses without causing yellowing of silicone rubber.

[0038] Copper salts or copper oxides have extremely poor dispersion in silicone rubber. Loading copper oxide on titanium dioxide nanoparticles helps improve the uniformity of copper oxide dispersion in silicone rubber.

[0039] Both amino and hydroxyl groups readily form coordination bonds with copper. Polyvinyl alcohol containing amino groups can enhance the dispersibility of copper oxide in silicone rubber by forming coordination bonds with copper, thereby enabling a more uniform dispersion of copper-loaded titanium dioxide nanoparticles in the silicone rubber, which in turn helps improve the uniformity of copper oxide dispersion in the silicone rubber. Furthermore, silicone rubber is typically prepared by mixing, during which copper oxide from copper-loaded titanium dioxide nanoparticles may fall off. The presence of polyvinyl alcohol containing amino groups also allows for better dispersion of copper oxide in the silicone rubber.

[0040] Those skilled in the art can prepare copper-loaded titanium dioxide nanoparticles using methods known in the art. For example, copper-loaded titanium dioxide nanoparticles can be prepared by sol-gel method, hydrothermal method, magnetron sputtering method, chemical precipitation method and microwave-assisted synthesis method.

[0041] The silicone leather involved in the present application comprises copper-loaded titanium dioxide nanoparticles and polyvinyl alcohol containing amino groups. The copper-loaded titanium dioxide nanoparticles have antibacterial and antiviral properties while not causing yellowing of the silicone leather, while the polyvinyl alcohol containing amino groups can significantly improve the dispersion uniformity of copper oxide in silicone rubber, which is equivalent to enhancing the dispersibility of copper oxide. Silicone rubber: As the basic material of silicone leather, silicone rubber provides the necessary flexibility and durability. Copper-loaded titanium dioxide nanoparticles: are titanium dioxide (TiO2) particles with copper compounds (such as copper oxide, copper hydroxide, etc.) loaded on the surface. On the one hand, they have antibacterial and antiviral capabilities: copper and its compounds have excellent antibacterial and antiviral properties, which can effectively inhibit the growth of microorganisms. On the other hand, they have anti-yellowing properties: traditionally, copper-containing antibacterial materials may cause yellowing of the material, but the copper-loaded titanium dioxide nanoparticles in the embodiments of the present application are uniquely designed to avoid this problem and maintain the color stability of the silicone leather. Polyvinyl alcohol containing amino groups:

[0042] As a dispersant, amino-containing polyvinyl alcohol can significantly improve the uniformity of copper oxide dispersion in silicone rubber. This helps ensure the uniform distribution of antibacterial and antiviral properties within the silicone leather, while also enhancing the overall performance of the material. By introducing copper-loaded titanium dioxide nanoparticles and amino-containing polyvinyl alcohol, this silicone leather not only maintains excellent physical properties but also possesses exceptional antibacterial and antiviral capabilities and color stability. This type of silicone leather has broad application prospects in various fields, including medical care, hygiene, and home furnishing.

[0043] In some embodiments of the present application, the silicone leather further includes zinc oxide nanoparticles.

[0044] The role of zinc oxide nanoparticles in silicone leather: Enhanced antibacterial properties: The addition of zinc oxide nanoparticles to silicone leather significantly improves its antibacterial properties. This facilitates silicone leather's application in medical and health fields by reducing the growth and spread of bacteria. Improved UV protection: The UV-shielding properties of zinc oxide nanoparticles give silicone leather greater UV resistance, extending the product's lifespan and aesthetics. Improved physical properties: The addition of zinc oxide nanoparticles also improves silicone leather's physical properties, such as wear resistance and aging resistance, enhancing its durability and stability.

[0045] When zinc oxide nanoparticles are added to silicone leather, they create a synergistic effect with the silicone rubber, copper-loaded titanium dioxide nanoparticles, and amino-containing polyvinyl alcohol. These components together form a stable and uniform silicone leather structure, endowing the product with a variety of excellent properties. For example, the copper-loaded titanium dioxide nanoparticles and zinc oxide nanoparticles can jointly enhance the antibacterial properties of silicone leather, while the amino-containing polyvinyl alcohol helps these nanoparticles to disperse evenly and stabilize their presence within the silicone leather.

[0046] It is easy to understand that nano zinc oxide has a small particle size and a large specific surface area, and has high surface chemical activity and excellent photocatalytic activity, which can degrade dirt on the surface of the silicone leather or penetrate into the silicone leather. Nano zinc oxide also has a certain bactericidal effect.

[0047] In some embodiments of the present application, the silicone leather further includes sodium polyacrylate.

[0048] The application of zinc oxide nanoparticles in silicone leather is primarily reflected in its enhanced functionality, including significantly enhanced antibacterial properties. This enhanced effect facilitates silicone leather's application in medical and health fields, effectively reducing the growth and spread of bacteria while enhancing its UV protection. The UV-shielding properties of zinc oxide nanoparticles impart enhanced UV resistance to silicone leather, thereby extending the product's lifespan and maintaining its aesthetics while also improving its physical properties. Furthermore, the addition of zinc oxide nanoparticles improves physical properties such as wear resistance and aging resistance, enhancing product durability and stability.

[0049] When zinc oxide nanoparticles are introduced into silicone leather, they create a synergistic effect with other ingredients, including silicone rubber, copper-loaded titanium dioxide nanoparticles, and amino-containing polyvinyl alcohol. These ingredients together create a stable and uniform silicone leather structure, endowing the product with a variety of exceptional properties. For example, the copper-loaded titanium dioxide nanoparticles and zinc oxide nanoparticles enhance the silicone leather's antibacterial properties, while the amino-containing polyvinyl alcohol facilitates the uniform dispersion and stable presence of these nanoparticles within the silicone leather.

[0050] Nano-zinc oxide, due to its tiny particle size, large specific surface area, high surface chemical activity, and excellent photocatalytic activity, can effectively degrade stains on the surface of silicone leather or that have penetrated into it. It also possesses a certain degree of bactericidal ability.

[0051] In some embodiments of the present application, the silicone rubber is methyl vinyl silicone rubber.

[0052] Application of methyl vinyl silicone rubber in silicone leather: Improving physical properties. In view of the excellent high and low temperature resistance, aging resistance and chemical resistance of methyl vinyl silicone rubber, using it as the base material of silicone leather can significantly enhance the physical properties and durability of silicone leather. Expanding application areas: The physiological inertness and chemical resistance of methyl vinyl silicone rubber make silicone leather suitable for more fields, such as medical, sanitation, food processing and other occasions with strict requirements on high safety and stability. Improving processing flexibility: The easy processability of this material makes it easier to prepare silicone leather into products of various shapes and sizes to meet the needs of different applications.

[0053] When methyl vinyl silicone rubber is incorporated into silicone leather, it creates a synergistic effect with ingredients such as copper-loaded titanium dioxide nanoparticles, zinc oxide nanoparticles, sodium polyacrylate, and amino-containing polyvinyl alcohol. These ingredients together form a stable and uniform silicone leather structure, endowing the product with a variety of exceptional properties. For example, methyl vinyl silicone rubber, as a substrate, provides the silicone leather's fundamental physical properties and structural support; copper-loaded titanium dioxide nanoparticles and zinc oxide nanoparticles jointly enhance the silicone leather's antibacterial properties and UV protection; sodium polyacrylate enhances the silicone leather's hygroscopicity and breathability, while also improving its processing properties; and amino-containing polyvinyl alcohol facilitates the uniform dispersion and stable presence of these nanoparticles and additives within the silicone leather.

[0054] Methyl vinyl silicone rubber has become an ideal material for making silicone leather due to its excellent high and low temperature resistance, surface non-stickiness and aging resistance.

[0055] In some embodiments of the present application, the silicone leather further comprises copper pyrithione.

[0056] Copper pyrithione, a small molecule, can be uniformly dispersed in silicone rubber. This compound exhibits significant antifouling and antibacterial properties and exhibits extremely high molecular stability. Compared to copper-loaded titanium dioxide nanoparticles and zinc oxide nanoparticles, copper pyrithione disperses better in silicone rubber, providing a foundation of antifouling and antibacterial properties for silicone leather. This avoids the significant differences in dirt and bacteria distribution between the active area and other areas of the silicone rubber, often associated with copper-loaded titanium dioxide nanoparticles and zinc oxide nanoparticles.

[0057] In some embodiments of the present application, the silicone leather also includes graphene.

[0058] Graphene is an excellent antibacterial material. Its mechanism is that its sharp physical edges can effectively cut the surface of bacteria, while inducing bacteria to produce reactive oxygen species, leading to metabolic disorders and ultimately death. In addition, graphene has a large specific surface area and excellent hydrophobic properties, which enables it to effectively adsorb phospholipid molecules on the surface of bacteria, thereby destroying the cell membrane structure and causing bacterial death. At the same time, graphene isolates bacteria from the surrounding medium by wrapping them, blocking their proliferation, thereby achieving an antibacterial effect. Furthermore, due to the difference between the two-dimensional structure of graphene and the one-dimensional structure of silicone rubber molecular chains, the addition of graphene can hinder the sliding between silicone rubber molecular chains. Therefore, the addition of a small amount of graphene can significantly improve the mechanical strength of silicone leather. In addition, the addition of graphene helps to improve the density of silicone leather, thereby alleviating the problem of large pores in silicone leather to a certain extent, enhancing its anti-penetration ability, ensuring that dirt does not adhere to the surface of silicone leather, and preventing dirt from penetrating, avoiding cleaning problems.

[0059] In some embodiments of the present application, the silicone leather comprises, in terms of mass percentage of the silicone leather:

[0060] 60% to 70% methyl vinyl silicone rubber, 6% to 10% nano zinc oxide, 6% to 10% copper-loaded titanium dioxide nanoparticles, 5% to 8% copper pyridinethione, 5% to 8% vulcanizing agent, 0.3% to 0.5% high hydrogen silicone oil, 0.5% to 0.8% platinum catalyst, and 5% to 8% amino-containing polyvinyl alcohol.

[0061] The primary functions of methyl vinyl silicone rubber (60%-70%) in silicone leather include: serving as the primary substrate, providing fundamental physical properties and structural support; its resistance to high and low temperatures, aging, and chemicals ensures the performance stability of silicone leather in diverse environments. Nano-zinc oxide (6%-10%) provides antimicrobial properties, inhibiting a wide range of bacteria; providing UV shielding, protecting silicone leather from UV damage; and enhancing the leather's wear resistance and aging resistance. Copper-loaded titanium dioxide nanoparticles (6%-10%) provide excellent antimicrobial properties, killing or inhibiting bacterial growth; generating a photocatalytic reaction under illumination, decomposing organic matter and harmful gases, and purifying the air; and synergizing with nano-zinc oxide to further enhance the silicone leather's antimicrobial and UV protection capabilities. Copper pyridinethione (5%-8%) acts as a broad-spectrum, highly effective, low-toxic antifouling and antibacterial agent, enhancing the silicone leather's antimicrobial properties and improving its weather and corrosion resistance. The main functions of the vulcanizing agent (5%-8%) are to promote the reaction of rubber molecular chains, forming a three-dimensional network structure, enhancing the strength and stability of silicone leather, and improving the physical and mechanical properties of silicone leather, such as wear resistance and tear resistance. The main functions of the high-hydrogen silicone oil (0.3%-0.5%) are to act as a crosslinking agent, enhancing the crosslink density and physical properties of the rubber material; improving the softness and smoothness of silicone leather; and imparting a certain degree of water resistance to silicone leather. The main functions of the platinum catalyst (0.5%-0.8%) are to accelerate the vulcanization reaction and improve production efficiency; and to control the progress of the vulcanization reaction to ensure the stable quality of silicone leather. The main functions of the amino-containing polyvinyl alcohol (5%-8%) are to act as a dispersant and stabilizer, helping to evenly disperse nanoparticles and additives in the silicone leather; improving the adhesion and water resistance of the silicone leather; and improving the processing and formability of the silicone leather.

[0062] In some embodiments of the present application, the vulcanizing agent is at least one of 2,5-dimethyl-2,5-di-tert-butyl peroxyhexane, trimethylolpropane trimethacrylate or dicumyl peroxide.

[0063] 2,5-Dimethyl-2,5-di-tert-butylhexyl peroxide has a wide range of applications, primarily as a free radical initiator for polymerization reactions and as an additive to improve the viscosity of polyolefins. Furthermore, the compound acts as an effective high-temperature vulcanizer during the silicone rubber vulcanization process, with significant effects on the vulcanization of vinyl rubber. It can also be used as a hardener for unsaturated polyesters and a vulcanizer for fluororubber, polyurethane rubber, and EPDM rubber. The use of trimethylolpropane trimethacrylate in silicone rubber can significantly improve the hardness, tensile strength, and heat resistance of silicone rubber, optimizing its physical and chemical properties and thus enhancing its overall performance. Dicumyl peroxide excels in applications such as thick molded products, metal bonding products, and injection molding products. It exhibits particularly good stability in carbon black-containing compounds, making it suitable for vulcanized rubber for sealing products.

[0064] Obviously, the above-mentioned vulcanizing agents are easily available in the market and are low in cost, while being able to achieve excellent vulcanization effects.

[0065] It is worth noting that trimethylolpropane trimethacrylate, as a vulcanizing agent, can not only improve the aging resistance and corrosion resistance of silicone leather and enhance its mechanical strength, but also increase the cross-linking density and accelerate the vulcanization process.

[0066] Second, please refer to Figure 1 The present application provides a method for preparing silicone leather, wherein the silicone leather is the silicone leather described in any embodiment of the first aspect, and the method comprises the following steps:

[0067] S1: mixing raw materials corresponding to all components of the silicone leather to obtain a liquid silicone mixture;

[0068] S2: providing release paper and a base fabric, coating the liquid silicone mixture on the release paper and laminating the mixture with the base fabric to obtain prefabricated leather;

[0069] S3: vulcanizing the pre-made leather to obtain the silicone leather.

[0070] In some embodiments of the present application, the temperature of the vulcanization treatment is 130-150° C.; and / or,

[0071] The time of the vulcanization treatment is 8 to 15 minutes.

[0072] As an example, the temperature of the sulfurization treatment may be 130°C, 135°C, 140°C, 145°C, or 150°C.

[0073] As another example, the vulcanization treatment time can be 8 minutes, 10 minutes, 12 minutes, or 15 minutes. The temperature and time of the vulcanization treatment can be adjusted according to specific production requirements to achieve the best vulcanization effect. In the embodiments of the present application, by precisely controlling the temperature and time of the vulcanization treatment, it is possible to ensure that the silicone leather has good physical properties and chemical stability, meeting the needs of various application scenarios.

[0074] The present application will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present application only and are not intended to limit the scope of the present application. The experimental methods in the following examples where specific conditions are not specified are generally measured according to industry standards. If there are no corresponding industry standards, then the methods are carried out according to general international standards, conventional conditions, or conditions recommended by the manufacturer.

[0075] Example 1

[0076] This embodiment provides a silicone leather, which is prepared through the following steps:

[0077] Sa: Weigh the following raw materials in proportion, based on the percentage of the total weight of the raw materials: 62% methyl vinyl silicone rubber, 10% nano zinc oxide, 6% copper-loaded titanium dioxide nanoparticles, 8% copper pyridinethione, 5% vulcanizing agent, 0.5% high hydrogen silicone oil, 0.5% platinum catalyst, and 8% amino-containing polyvinyl alcohol;

[0078] Sb: The above raw materials are mixed to obtain a liquid silica gel mixture;

[0079] Sc: providing release paper and base fabric, coating the liquid silicone mixture on the release paper and laminating it with the base fabric to obtain prefabricated leather;

[0080] Sd: The prefabricated product is subjected to a vulcanization treatment at 140° C. for 10 minutes to obtain the silicone leather.

[0081] The amino-containing polyvinyl alcohol described in this embodiment is a polymer product produced by Xi'an Qiyue Biotechnology Co., Ltd., with the product brand PVA5000-NH2.

[0082] The copper-loaded titanium dioxide nanoparticles described in this embodiment are prepared by the following steps:

[0083] Titanium dioxide nanoparticles were added to a 1 mol / L copper nitrate solution to produce a mixed solution, wherein the mass ratio of copper nitrate in the copper nitrate solution to the added titanium dioxide nanoparticles was 1:4. The mixed solution was added to a sealed reactor and subjected to a hydrothermal reaction at 200°C for 24 hours. The resulting solid was then centrifuged to obtain the copper-loaded titanium dioxide nanoparticles.

[0084] Example 2

[0085] This embodiment provides a silicone leather, which is prepared through the following steps:

[0086] Sa: Weigh the following raw materials in proportion, calculated by the percentage of the total weight of the raw materials: 70% methyl vinyl silicone rubber, 6% nano zinc oxide, 6% copper-loaded titanium dioxide nanoparticles, 6% copper pyridinethione, 6% vulcanizing agent, 0.3% high hydrogen silicone oil, 0.7% platinum catalyst, and 5% to 8% amino-containing polyvinyl alcohol;

[0087] Sb: The above raw materials are mixed to obtain a liquid silica gel mixture;

[0088] Sc: providing release paper and base fabric, coating the liquid silicone mixture on the release paper and laminating it with the base fabric to obtain prefabricated leather;

[0089] Sd: The prefabricated product is subjected to a vulcanization treatment at 140° C. for 10 minutes to obtain the silicone leather.

[0090] The amino-containing polyvinyl alcohol described in this embodiment is a polymer product produced by Xi'an Qiyue Biotechnology Co., Ltd., with the product brand PVA5000-NH2.

[0091] The copper-loaded titanium dioxide nanoparticles described in this embodiment are prepared by the following steps:

[0092] Titanium dioxide nanoparticles were added to a 1 mol / L copper nitrate solution to produce a mixed solution, wherein the mass ratio of copper nitrate in the copper nitrate solution to the added titanium dioxide nanoparticles was 1:4. The mixed solution was added to a sealed reactor and subjected to a hydrothermal reaction at 200°C for 24 hours. The resulting solid was then centrifuged to obtain the copper-loaded titanium dioxide nanoparticles.

[0093] Example 3

[0094] This embodiment provides a silicone leather, which is prepared through the following steps:

[0095] Sa: Weigh the following raw materials in proportion, calculated by the percentage of the total weight of the raw materials: 60% to 70% of methyl vinyl silicone rubber, 6% to 10% of nano zinc oxide, 6% to 10% of copper-loaded titanium dioxide nanoparticles, 5% to 8% of copper pyridinethione, 5% to 8% of a vulcanizing agent, 0.3% to 0.5% of a high hydrogen silicone oil, 0.5% to 0.8% of a platinum catalyst, and 5% to 8% of an amino-containing polyvinyl alcohol;

[0096] Sb: The above raw materials are mixed to obtain a liquid silica gel mixture;

[0097] Sc: providing release paper and base fabric, coating the liquid silicone mixture on the release paper and laminating it with the base fabric to obtain prefabricated leather;

[0098] Sd: The prefabricated product is subjected to a vulcanization treatment at 140° C. for 10 minutes to obtain the silicone leather.

[0099] The amino-containing polyvinyl alcohol described in this embodiment is a polymer product produced by Xi'an Qiyue Biotechnology Co., Ltd., with the product brand PVA5000-NH2.

[0100] The copper-loaded titanium dioxide nanoparticles described in this embodiment are prepared by the following steps:

[0101] Titanium dioxide nanoparticles were added to a 1 mol / L copper nitrate solution to produce a mixed solution, wherein the mass ratio of copper nitrate in the copper nitrate solution to the added titanium dioxide nanoparticles was 1:4. The mixed solution was added to a sealed reactor and subjected to a hydrothermal reaction at 200°C for 24 hours. The resulting solid was then centrifuged to obtain the copper-loaded titanium dioxide nanoparticles.

[0102] Comparative Example

[0103] The only difference between this comparative example and Example 1 is that the raw materials used in this comparative example do not contain amino-containing polyvinyl alcohol, and the amino-containing polyvinyl alcohol is replaced by an equal weight of methyl vinyl silicone rubber.

[0104] This comparative example provides a silicone leather, which is prepared by the following steps:

[0105] Sa: Weigh the following raw materials in proportion, based on the percentage of the total weight of the raw materials: 70% methyl vinyl silicone rubber, 10% nano zinc oxide, 6% copper-loaded titanium dioxide nanoparticles, 8% copper pyridinethione, 5% vulcanizing agent, 0.5% high hydrogen silicone oil, 0.5% platinum catalyst, and 8% amino-containing polyvinyl alcohol;

[0106] Sb: The above raw materials are mixed to obtain a liquid silica gel mixture;

[0107] Sc: providing release paper and base fabric, coating the liquid silicone mixture on the release paper and laminating it with the base fabric to obtain prefabricated leather;

[0108] Sd: The prefabricated product is subjected to a vulcanization treatment at 140° C. for 10 minutes to obtain the silicone leather.

[0109] The copper-loaded titanium dioxide nanoparticles described in this comparative example were prepared by the following steps:

[0110] Titanium dioxide nanoparticles were added to a 1 mol / L copper nitrate solution to produce a mixed solution, wherein the mass ratio of copper nitrate in the copper nitrate solution to the added titanium dioxide nanoparticles was 1:4. The mixed solution was added to a sealed reactor and subjected to a hydrothermal reaction at 200°C for 24 hours. The resulting solid was then centrifuged to obtain the copper-loaded titanium dioxide nanoparticles.

[0111] Related experiments and effect data:

[0112] Take the silicone leather from Example 1 and cut nine 1 cm x 1 cm square samples. Add a drop of the pre-prepared influenza virus solution to the center of each square sample. Repeat the above steps for each square sample. After 24 hours, test the virus residue on each square sample and calculate the virus reduction rate. Repeat the same steps for the silicone leather from the comparative example.

[0113] The statistical results are as follows:

[0114] The 9 test results of Example 1 are: 99.32, 99.44, 99.27, 99.32, 99.44, 99.27, 99.38, 99.43, 99.46.

[0116] The 9 test results of the comparative example are: 89.21, 88.39, 98.92, 87.83, 85.54, 80.78, 99.76, 80.11, 82.76.

[0118] As can be seen from the above test results, the virus reduction rate of all nine test results in Example 1 reached over 99%, and the main antiviral substance in the silicone leather was the copper oxide on the surface of the copper-loaded titanium dioxide. All nine test results in Example 1 showed good virus killing effects, indicating that the copper oxide was very evenly dispersed in the silicone leather of Example 1.

[0119] In the comparative example, only two test results achieved a virus reduction rate exceeding 99%, while the remaining test results ranged from 80% to 90%. This indicates that the copper oxide distribution in the silicone leather of the comparative example is less uniform than in Example 1. The only difference between the comparative example and Example 1 is that the raw materials of Example 1 contain 8% amino-containing polyvinyl alcohol, while the comparative example replaces the amino-containing polyvinyl alcohol with an equal weight of methyl vinyl silicone rubber. Clearly, the addition of amino-containing polyvinyl alcohol significantly increases the uniformity of copper oxide dispersion in the silicone leather.

[0120] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity and should not be understood as a hard limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numbers within the range. For example, the description of a range from 1 to 6 should be considered to have specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which applies regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0121] In this application, unless otherwise stated, directional terms such as "upper" and "lower" refer specifically to the directions of the drawings in the accompanying drawings. In addition, in the description of this application specification, the terms "include", "comprise", etc. mean "including but not limited to". Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the phrase "include..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements. In this article, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. For the association relationship of more than three associated objects described with "and / or", it means that these three associated objects can exist alone, or any at least two of them exist at the same time. For example, for A, and / or B, and / or C, it can be represented that any one of A, B, and C exists alone, or any two of them exist at the same time, or three of them exist at the same time. In this article, "at least one" refers to one or more, and "multiple" refers to two or more. "At least one" "at least one of the following (individuals)" or similar expressions refer to any combination of these items, including any combination of single item (individuals) or plural items (individuals). For example, "at least one of a, b, or c (individuals)," or "at least one of a, b, and c (individuals)", can all represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple respectively. "Number representation" involved in this application, such as parts by weight, parts by mass, etc., represents the proportional relationship between each component. In the proportional relationship involved in this application, the parameters that need to be described by proportion should be understood as the first term of the proportional formula in the order of description, and the proportional numbers should be understood as the second term of the proportional formula. For example, if the mass ratio of substance A, substance B and substance C is 1:2:3, then substance A, substance B and substance C should correspond one-to-one to the proportional numbers in the proportional formula in the order of description, that is, the mass of substance A: the mass of substance B: the mass of substance C = 1:2:3.

[0122] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A silicone leather, characterized in that, The silicone leather comprises the following components: Silicone rubber; Copper-loaded titanium dioxide nanoparticles, wherein the copper-loaded titanium dioxide nanoparticles are titanium dioxide nanoparticles with a copper compound loaded on the surface, wherein the copper compound includes at least one of copper oxide and copper hydroxide; Polyvinyl alcohol containing amino groups.

2. The silicone leather according to claim 1, characterized in that The silicone leather also includes zinc oxide nanoparticles.

3. The silicone leather according to claim 1, characterized in that The silicone leather also includes sodium polyacrylate.

4. The silicone leather according to claim 1, characterized in that The silicone rubber is methyl vinyl silicone rubber.

5. The silicone leather according to claim 1, characterized in that The silicone leather also includes copper pyrithione.

6. The silicone leather according to claim 1, characterized in that The silicone leather also includes graphene.

7. The silicone leather according to claim 1, characterized in that Measured in percentage by mass of the silicone leather, the silicone leather comprises: 60% to 70% methyl vinyl silicone rubber, 6% to 10% nano zinc oxide, 6% to 10% copper-loaded titanium dioxide nanoparticles, 5% to 8% copper pyridinethione, 5% to 8% vulcanizing agent, 0.3% to 0.5% high hydrogen silicone oil, 0.5% to 0.8% platinum catalyst, and 5% to 8% amino-containing polyvinyl alcohol.

8. The silicone leather according to claim 7, characterized in that The vulcanizing agent is at least one of 2,5-dimethyl-2,5-di-tert-butyl peroxyhexane, trimethylolpropane trimethacrylate or dicumyl peroxide.

9. A silicone leather and a preparation method thereof, characterized in that: The silicone leather is the silicone leather according to any one of claims 1 to 8, and the method comprises the following steps: Mixing raw materials corresponding to all components of the silicone leather to obtain a liquid silicone mixture; Providing release paper and base fabric, coating the liquid silicone mixture on the release paper and then laminating it with the base fabric to obtain prefabricated leather; The prefabricated leather is subjected to a vulcanization treatment to obtain the silica gel leather.

10. The silicone leather and preparation method thereof according to claim 9, characterized in that: The temperature of the vulcanization treatment is 130-150° C.; and / or, The time of the vulcanization treatment is 8 to 15 minutes.

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