Mildew-proof antibacterial organic silicon synthetic leather carpet material and preparation method thereof

Abstract

The invention relates to a mildew-proof and antibacterial organic silicon synthetic leather carpet material and a preparation method thereof, and belongs to the technical field of organic silicon leathes.The organic silicon synthetic leather carpet material comprises an organic silicon bottom layer, a bonding layer and a polyurethane base layer, the organic silicon bottom layer comprises the following components: hydroxyl-terminated polydimethylsiloxane, methyl vinyl silicone rubber, hydrogen-containing silicone oil, a hydrogen-containing cross-linking agent and a platinum catalyst, and the polyurethane Bass layer comprises the following components: polyurethane resin, a DMF (Dimethyl Formamide) solvent, an auxiliary agent and a pigment. The organic silicon bottom layer, the bonding layer and the polyurethane Bass layer further comprise an anti-mildew antibacterial agent, and the anti-mildew antibacterial agent is obtained by passivating nanometer aluminum oxide, coating the nanometer aluminum oxide with silicon dioxide and then reacting the nanometer aluminum oxide with a polymer solution. According to the organic silicon synthetic leather carpet material disclosed by the invention, the mildew-proof antibacterial agent is added into the three-layer structure, so that the material has good antibacterial, flame-retardant, heat-conducting and mechanical effects, and is suitable for carpet materials.

Description

Technical Field

[0001] The invention belongs to the technical field of organic silicon leather, and in particular relates to a mildew-proof and antibacterial organic silicon synthetic leather carpet material and a preparation method thereof. Background Art

[0002] As a synthetic leather variety that has appeared in recent years, silicone synthetic leather has many properties that are superior to traditional synthetic leather materials, such as hydrolysis resistance, UV resistance, antifouling, and flame retardancy, making it a popular carpet material on the market. Due to its special use, carpet materials need to have excellent mildew and antibacterial properties, as well as excellent thermal conductivity so that the heat from the floor heating can reach the room, as well as flame retardancy to reduce fire hazards. At the same time, they also need to have a certain degree of softness and strength.

[0003] CN118727458A discloses a kind of organic silicon ecological leather and its preparation method, and uses biomass modified surface layer to give synthetic leather flame retardant, antibacterial, antistatic, antifouling, high wear resistance, and biomass modified foaming layer to give synthetic leather flame retardant, plump feel, soft elasticity, but biomass itself is easy to breed bacteria and mold, and short-term use does have excellent effect, but after long-term use, it will become a hotbed of bacteria and mold. CN109940938B discloses a kind of antibacterial leather and its preparation method, which uses organic silica gel as main component, carboxymethyl chitosan silver as antibacterial factor, modified nano silicon dioxide and modified layered bimetallic oxide as flame retardant factor, and obtains good antibacterial, flame retardant and other properties, and at the same time takes into account the mechanical properties of materials. However, carboxymethyl chitosan silver may be affected in high humidity and high temperature environment, and the preparation process of carboxymethyl chitosan silver is relatively complicated, and it needs to go through multi-step chemical reaction to realize carboxymethylation and silver ion loading, which leads to its high production cost and is not suitable for carpet materials. Summary of the invention

[0004] The purpose of the present invention is to provide a mildew-proof and antibacterial organic silicon synthetic leather carpet material and a preparation method thereof in order to solve the above-mentioned problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A mildew-proof and antibacterial organosilicon synthetic leather carpet material, comprising an organosilicon bottom layer, an adhesive layer and a polyurethane base layer, wherein the organosilicon bottom layer comprises the following components: terminal hydroxyl polydimethylsiloxane, methyl vinyl silicone rubber, hydrogen-containing silicone oil, hydrogen-containing crosslinking agent, platinum catalyst, mildew-proof and antibacterial agent, the adhesive layer is formed by coating with a tackifier, the tackifier contains mildew-proof and antibacterial agent, and the polyurethane base layer comprises the following components: polyurethane resin, DMF solvent, additives, pigment, mildew-proof and antibacterial agent;

[0007] The mildew and antibacterial agent is obtained by reacting nano-alumina with a polymer solution after passivation and silicon dioxide coating. The polymer solution is obtained by initiation of triethyl phosphate, dimethyl fumarate and vinyl acetate.

[0008] As a further optimization scheme of the present invention, the preparation of the mildew and antibacterial agent comprises the following steps:

[0009] (1) Evenly dispersing nano-alumina in ethanol, then dropping a passivating agent into the ethanol, stirring and keeping warm after the dropping, centrifuging and drying the precipitate;

[0010] (2) the precipitate is dispersed in ethanol, an appropriate amount of water is added, PVP and ammonia water are gradually added while stirring and mixed evenly, and then a mixed solution of tetraethyl orthosilicate and ethanol is added dropwise, stirring is continued at room temperature, the product is washed with water and centrifuged three times, and vacuum dried at room temperature to obtain a coating;

[0011] (3) The coating and the polymer solution are mixed, a catalyst is added to heat the mixture for reaction, and the reaction product is washed and dried to obtain the mildew and antibacterial agent.

[0012] As a further optimization scheme of the present invention, the step (1) is specifically as follows: the nano-alumina is uniformly dispersed in ethanol with a mass concentration of 95wt%, and then a passivating agent of 1-3% by mass of the nano-alumina is uniformly added dropwise to the ethanol, heated to 60°C, stirred and kept warm for 1-5h after the addition is completed within 1h, the solution is centrifuged and the precipitate is taken, and after at least 3 washes, it is low-temperature dried at 45°C.

[0013] As a further optimization scheme of the present invention, the step (2) is specifically as follows: the precipitate is dispersed in an ethanol solution with a mass concentration of 75wt% at a volume ratio of 1:5, PVP and ammonia water are added and mixed evenly, and then a mixed solution of ethyl orthosilicate and ethanol with an equal volume to the uniform system is dripped within 1 hour, stirring is continued at room temperature for 12-24 hours, washing with water and centrifuging three times, and vacuum drying at room temperature for 24-48 hours to obtain a coating.

[0014] As a further optimization scheme of the present invention, the dosage of PVP is 0.2-5 g / L, the dosage of ammonia water is 100-200 ml / L, and the concentration of TEOS in the mixed solution of tetraethyl orthosilicate and ethanol is 1-3 mol / L.

[0015] As a further optimization scheme of the present invention, the step (3) is specifically as follows: mixing the coating and the polymer solution in a volume ratio of 1:5, adding a sufficient amount of catalyst ethyl acetate, heating to 140°C for reaction, and washing and drying the reaction product to obtain the antifungal and antibacterial agent.

[0016] As a further optimization scheme of the present invention, the preparation process of the polymer solution is specifically as follows: triethyl phosphate, dimethyl fumarate and vinyl acetate are mixed, and the mixture is obtained under the initiation of ammonium persulfate, wherein, by mass percentage, the amount of dimethyl fumarate is 0.5-2%, the amount of vinyl acetate is 2-3%, and the balance is triethyl phosphate.

[0017] The present invention also provides a method for preparing the above-mentioned mildew-proof and antibacterial organosilicon synthetic leather carpet material, comprising the following steps:

[0018] (1) mixing the components of the silicone base layer uniformly, coating it on a release paper and heating it with hot air;

[0019] (2) adding a mixture of DMF solvent, additives and pigments to the polyurethane resin, degassing, coating on the base fabric, and then putting it into water, the DMF solvent is replaced by water, the polyurethane resin is gradually solidified, and a polyurethane base layer is formed;

[0020] (3) coating the adhesive layer on the silicone base layer and placing the polyurethane base layer on the adhesive layer, followed by heating with hot air, peeling off the release paper after cooling, trimming and performing post-finishing to obtain the silicone synthetic leather carpet material.

[0021] The beneficial effects of the present invention are:

[0022] The organic silicon synthetic leather carpet material of the present invention has good antibacterial, flame retardant, thermal conductivity and mechanical effects by adding mildew and antibacterial agents in the three-layer structure, and is suitable for carpet materials. The present invention uses a passivating agent to coat the nano-alumina, so that it can reduce damage in the subsequent treatment process, so that it can give full play to its excellent performance, and then uses silicon dioxide to coat it, which can increase its strength and reduce the overall compression deformation of the material. Finally, the polymer solution obtained by mixing triethyl phosphate, dimethyl fumarate and vinyl acetate is used to react with the nano-alumina coated with silicon dioxide, which may generate a support structure similar to an organic skeleton, which can maximize the various effects of nano-alumina and further enhance some mechanical properties of the material. In addition, triethyl phosphate, dimethyl fumarate and vinyl acetate are all excellent antibacterial components, among which triethyl phosphate also has excellent flame retardant effect. DETAILED DESCRIPTION

[0023] The present application is described in further detail below. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0024] 1. Materials

[0025] The organic silicon synthetic leather carpet material of the present invention is composed of a three-layer structure, which comprises a polyurethane base layer, a bonding layer and an organic silicon bottom layer from top to bottom.

[0026] 1.1 The organic silicon base layer includes the following ingredients: by weight, 80-100 parts of terminal hydroxyl polydimethylsiloxane, 20-30 parts of methyl vinyl silicone rubber, 5-10 parts of hydrogen-containing silicone oil, 1-2 parts of hydrogen-containing crosslinking agent, 0.05-1 parts of platinum catalyst, and 20-30 parts of mildew and antibacterial agent.

[0027] 1.2 The organic silicon adhesive layer comprises the following components: by weight, 30-40 parts of tackifier and 5-10 parts of mildew and antibacterial agent.

[0028] 1.3 The polyurethane base layer includes the following ingredients: by weight, 80-100 parts of polyurethane resin, 10-20 parts of DMF solvent, 0.5-2.5 parts of anionic surfactant, 2-3 parts of nonionic surfactant, 1-5 parts of carbon black pigment, and 15-30 parts of mildew and antibacterial agent.

[0029] The hydroxy-terminated polydimethylsiloxane, hydrogen-containing silicone oil, and platinum catalyst used in the test were purchased from Anhui Aiyota Silicone Oil Co., Ltd. The hydrogen-containing crosslinking agent used in the test was purchased from Anhui Xinjia Silicone Technology Co., Ltd. The tackifier in the present invention can be an alkoxy-containing or epoxy-containing silane, and the Crosile-5626 model tackifier was used in the following test. The polyurethane resin used in the test was purchased from Anhui Mingyi Silicon Industry Co., Ltd., N,N-dimethylformamide (DMF solvent) was purchased from Nantong Changchen Chemical Co., Ltd., the anionic surfactant was commercially available sodium dodecyl sulfate, and the nonionic surfactant was commercially available sorbitol fatty acid ester.

[0030] 1.4 The preparation of antifungal and antibacterial agent includes the following steps:

[0031] (1) Nano-alumina is uniformly dispersed in ethanol with a mass concentration of 95 wt%, and then a passivating agent of 1-3% by mass of the nano-alumina is uniformly added dropwise to the ethanol, heated to 60° C., stirred and kept warm for 1-5 hours after the addition is completed within 1 hour, the solution is centrifuged and the precipitate is taken, washed at least 3 times, and then dried at 45° C.;

[0032] (2) dispersing the precipitate in an ethanol solution with a mass concentration of 75 wt% at a volume ratio of 1:5, adding polyvinyl pyrrolidone (PVP) and ammonia water and mixing evenly, then dripping a mixed solution of tetraethyl orthosilicate and ethanol in an amount equal to the uniform system within 1 hour, continuing to stir at room temperature for 12-24 hours, washing with water and centrifuging three times, and vacuum drying at room temperature for 24-48 hours to obtain a coating; wherein the amount of PVP is 0.2-5 g / L, the amount of ammonia water is 100-200 ml / L, and the concentration of TEOS in the mixed solution of tetraethyl orthosilicate and ethanol is 1-3 mol / L;

[0033] (3) Triethyl phosphate, dimethyl fumarate and vinyl acetate are mixed, and a polymer solution is obtained under the initiation of ammonium persulfate, wherein the amount of dimethyl fumarate is 0.5-2%, the amount of vinyl acetate is 2-3%, and the balance is triethyl phosphate. The coating and the polymer solution are mixed in a volume ratio of 1:5, and a sufficient amount of catalyst ethyl acetate is added, and the mixture is heated to 140°C for reaction, and the reaction product is washed and dried to obtain an antifungal and antibacterial agent.

[0034] Unless otherwise specified, the methods used in the present invention are conventional methods known to those skilled in the art, and the reagents and other materials used are commercially available products unless otherwise specified.

[0035] 2. Methods

[0036] 2.1 Using the raw material composition shown in Table 1, prepare the silicone synthetic leather carpet material according to the following preparation steps:

[0037] (1) Preparation of antifungal and antibacterial agents

[0038] The nano-alumina is uniformly dispersed in ethanol with a mass concentration of 95wt%, and then a phosphate passivator with a mass concentration of 1% of the nano-alumina is uniformly added to the ethanol, heated to 60°C, stirred and kept warm for 1-5h after the dripping is completed within 1h, the solution is centrifuged and the precipitate is taken, washed at least 3 times and then dried at 45°C;

[0039] The precipitate was dispersed into an ethanol solution with a mass concentration of 75wt% at a volume ratio of 1:5, polyvinyl pyrrolidone PVP and ammonia water were added and mixed evenly, and then a mixed solution of tetraethyl orthosilicate and ethanol with an equal volume to the uniform system was dripped within 1 hour, and the mixture was stirred for 24 hours at room temperature, washed with water and centrifuged three times, and vacuum dried at room temperature for 48 hours to obtain a coating; wherein the amount of PVP was 1g / L, the amount of ammonia water was 200ml / L, and the concentration of TEOS in the mixed solution of tetraethyl orthosilicate and ethanol was 3mol / L;

[0040] Triethyl phosphate, dimethyl fumarate and vinyl acetate are mixed, and a polymer solution is obtained under the initiation of ammonium persulfate, wherein the concentration of ammonium persulfate is 1wt%, wherein, by mass percentage, the amount of dimethyl fumarate is 0.5%, the amount of vinyl acetate is 2%, and the balance is triethyl phosphate. The coating and the polymer solution are mixed at a volume ratio of 1:5, and a sufficient amount of catalyst ethyl acetate is added, and the mixture is heated to 140°C for reaction, and the reaction product is washed and dried to obtain an antifungal and antibacterial agent.

[0041] (2) The components of the silicone base layer are mixed evenly to obtain a primer, the coating speed of the coating machine is set to 5 m / min, the primer is coated on the release paper using a scraper method, and then the release paper coated with the primer is placed in an oven and heated in hot air at a temperature of 120±10°C for 3±1 min to obtain a cured silicone base layer.

[0042] (3) A mixture of DMF solvent, additives and pigments is added to the polyurethane resin, and after degassing by a vacuum machine, the mixture is coated on a polyester fiber base cloth, and then placed in water. The DMF solvent is replaced by water, and the polyurethane resin gradually solidifies. The polyurethane resin is then washed in hot water at 100°C until the residual DMF content is less than 1%, thereby forming a polyurethane base layer.

[0043] (4) The tackifier and the mildew and antibacterial agent are mixed evenly, the coating speed of the coating machine is set to 5 m / min, the primer is coated on the cured silicone base layer by a scraper method to form a bonding layer, and then a polyurethane base layer is placed on the bonding layer. The whole is then placed in an oven and heated and cured in hot air at a temperature of 120±10° C. for 3±1 min, the release paper is peeled off, and embossing is performed after trimming (roller embossing machine, 100±10° C., pressure 5 MPa, time 5 s) to obtain a silicone synthetic leather carpet material.

[0044] Table 1. Preparation of raw materials composition

[0045]

[0046] 2.2 Test and Conclusion

[0047] Control group 1: a polyurethane base layer, an adhesive layer and a silicone base layer without antifungal and antibacterial agents were prepared according to method 2.1;

[0048] Control group 2: The antifungal and antibacterial agents in the polyurethane base layer, the adhesive layer and the silicone base layer were replaced with nano-silver antibacterial agents, and the preparation method was as described in 2.1.

[0049] The organic silicon synthetic leather carpet material prepared above was cut into suitable sizes as test samples and subjected to the following tests:

[0050] Thermal fatigue resistance: After aging treatment at 120℃ for 100h, repeated three times with 24h interval between each treatment, the thermal conductivity (ASTM / D5470) retention rate is used as the evaluation basis for thermal fatigue resistance. The thermal conductivity is measured after three aging treatments.

[0051] Antifungal and antibacterial properties: Each sample was cut into 20mm×20mm size, and aged for 100h at 120℃ with hot air, repeated three times, with 24 hours interval between each treatment. Test bacteria: Staphylococcus aureus and mold, antibacterial test: 20uL bacterial solution, concentration 5×10 6 cfu.ml- 1 , add agar medium, temperature 37℃, keep warm for 24h.

[0052] Flame retardancy: According to the flame retardant material standard ANSI / UL-94 standard B-level flame retardant grade test, a flame retardant test strip sample with a length of 127 mm, a width of 12.7 mm, and a minimum thickness of 3 mm was prepared.

[0053] Mechanical properties: The compression deformation of each sample was tested according to SATRATM64 standard.

[0054] Water absorption: Place each sample 2 cm under water to ensure that the sample is completely immersed. After standing for 24 hours, take it out to remove excess water on the surface and hang it in natural wind for 2 hours, then weigh it and record the mass change before and after water absorption.

[0055] The above test results are shown in Table 2:

[0056] Table 2. Performance parameters of various silicone synthetic leather carpet materials

[0057]

[0058] Note: The data in the present invention are averaged from multiple measurements and subjected to variance analysis.

[0059] The mildew and antibacterial agent prepared by the invention is suitable for organic silicon leather materials, has good antibacterial, flame retardant, thermal conductive and mechanical effects, and is suitable for carpet materials.

[0060] 2.3 Based on the components of the test group in 2.1, the effects of different preparation methods on the performance of silicone synthetic leather carpet materials were studied.

[0061] (1) Dispersing nano-alumina in an ethanol solution with a mass concentration of 75 wt% at a volume ratio of 1:5, adding polyvinyl pyrrolidone (PVP) and ammonia water and mixing them evenly, then dripping a mixed solution of tetraethyl orthosilicate and ethanol in an amount equal to the uniform system within 1 hour, stirring for 24 hours at room temperature, washing with water and centrifuging three times, and vacuum drying at room temperature for 48 hours to obtain a coating; wherein the amount of PVP is 1 g / L, the amount of ammonia water is 200 ml / L, and the concentration of TEOS in the mixed solution of tetraethyl orthosilicate and ethanol is 3 mol / L;

[0062] Triethyl phosphate, dimethyl fumarate and vinyl acetate were mixed, and a polymer solution was obtained under the initiation of ammonium persulfate, wherein the concentration of ammonium persulfate was 1wt%, the amount of dimethyl fumarate was 0.5%, the amount of vinyl acetate was 2%, and the balance was triethyl phosphate. The coating and the polymer solution were mixed in a volume ratio of 1:5, and a sufficient amount of catalyst ethyl acetate was added, and the mixture was heated to 140°C for reaction. The reaction product was washed and dried, and marked as solid one.

[0063] Control group 3: Solid 1 was used to replace the antifungal and antibacterial agent in the polyurethane base layer, the adhesive layer and the silicone base layer, and the mixture was prepared according to method 2.1.

[0064] (2) Nano-alumina is uniformly dispersed in ethanol with a mass concentration of 95 wt%, and then a phosphate passivator with a mass concentration of 1 wt% of the nano-alumina is uniformly added dropwise to the ethanol, heated to 60° C., stirred and kept warm for 1-5 hours after the addition is completed within 1 hour, the solution is centrifuged and the precipitate is collected, washed at least 3 times, and then dried at 45° C.;

[0065] Triethyl phosphate, dimethyl fumarate and vinyl acetate were mixed, and a polymer solution was obtained under the initiation of ammonium persulfate, wherein the concentration of ammonium persulfate was 1wt%, wherein, by mass percentage, the amount of dimethyl fumarate was 0.5%, the amount of vinyl acetate was 2%, and the balance was triethyl phosphate. The precipitate and the polymer solution were mixed at a volume ratio of 1:5, and a sufficient amount of catalyst ethyl acetate was added, and the mixture was heated to 140°C for reaction, and the reaction product was washed and dried, and marked as solid 2.

[0066] Control group 4: Solid II was used to replace the antifungal and antibacterial agent in the polyurethane base layer, adhesive layer and silicone base layer, and the mixture was prepared according to method 2.1.

[0067] (3) uniformly dispersing nano-alumina in ethanol with a mass concentration of 95 wt%, then uniformly dropping a phosphate passivator at a mass concentration of 1 wt% of the nano-alumina into the ethanol, heating to 60° C., stirring and keeping warm for 1-5 hours after the dropping is completed within 1 hour, centrifuging the solution and taking the precipitate, washing it at least 3 times and then drying it at 45° C.;

[0068] The precipitate was dispersed into an ethanol solution with a mass concentration of 75wt% in a volume ratio of 1:5, polyvinyl pyrrolidone (PVP) and ammonia water were added and mixed evenly, and then a mixed solution of tetraethyl orthosilicate and ethanol with an equal volume to the uniform system was added within 1 hour, and stirring was continued at room temperature for 24 hours. The solid was washed with water and centrifuged three times, and vacuum dried at room temperature for 48 hours to obtain solid three; wherein the amount of PVP was 1g / L, the amount of ammonia water was 200ml / L, and the concentration of TEOS in the mixed solution of tetraethyl orthosilicate and ethanol was 3mol / L.

[0069] Control group 5: Solid tri-replacement of the antifungal and antibacterial agent in the polyurethane base layer, adhesive layer and silicone base layer was prepared according to method 2.1.

[0070] Control group 6: Nano-alumina (industrial grade purity 95%, particle size 0.5 μm) was used to replace the mildew and antibacterial agent in the polyurethane base layer, the adhesive layer and the silicone base layer, and the mixture was prepared according to method 2.1.

[0071] The performance of the organic silicon synthetic leather carpet material prepared above was measured using method 2.2. The results are shown in Table 3:

[0072] Table 3. Material performance parameters of control group 3-5

[0073]

[0074]

[0075] It can be seen from the control group 3 and the experimental group that the passivation operation on nano-alumina will not affect its performance too much, but it will cause a slight decrease in the various effects of the material. This may be due to a large amount of loss of nano-alumina in the subsequent processing process, which causes its flame retardant, antibacterial and thermal conductivity properties to decrease slightly. It can be seen from the control group 4 that its thermal conductivity has increased, which may be due to the thermal insulation effect of silica. When the surface of the nano-alumina is not coated with silica, the thermal conductivity coefficient increases. It can be seen from the control groups 5-6 that the water absorption is mainly caused by the loose and porous polyurethane base layer. The water absorption in the test group is low, and the water absorption in the control groups 5-6 is high. It may be because the mildew and antibacterial agent of the present invention is filled in the pore structure of the polyurethane base layer, which reduces the water absorption rate and can further reduce the growth of bacteria and molds. In addition, the mildew and antibacterial agent of the present invention uses a polymer solution obtained by mixing triethyl phosphate, dimethyl fumarate and vinyl acetate to react with the silica-coated nano-alumina, which may generate a support structure similar to an organic skeleton, which is compounded with the nano-alumina to maximize the various effects of the nano-alumina. In addition, triethyl phosphate, dimethyl fumarate and vinyl acetate are all excellent antibacterial components, among which triethyl phosphate also has an excellent flame retardant effect.

[0076] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A mildew-proof and antibacterial organosilicon synthetic leather carpet material, comprising an organosilicon base layer, an adhesive layer and a polyurethane base layer, wherein the organosilicon base layer comprises the following components: terminal hydroxyl polydimethylsiloxane, methyl vinyl silicone rubber, hydrogen-containing silicone oil, hydrogen-containing crosslinking agent, and platinum catalyst, the adhesive layer is formed by coating with a tackifier, and the polyurethane base layer comprises the following components: polyurethane resin, DMF solvent, additives, and pigments; It is characterized in that The organic silicon bottom layer, bonding layer and polyurethane base layer also include anti-mildew and anti-bacterial agent, which is obtained by reacting nano-alumina with polymer solution after passivation and silica coating. The polymer solution is obtained by initiation of triethyl phosphate, dimethyl fumarate and vinyl acetate.

2. The mildew-proof and antibacterial organic silicon synthetic leather carpet material according to claim 1, characterized in that: The preparation of the mildew and antibacterial agent comprises the following steps: (1) Evenly dispersing nano-alumina in ethanol, then dropping a passivating agent into the ethanol, stirring and keeping warm after the dropping, centrifuging and drying the precipitate; (2) the precipitate is dispersed in ethanol, an appropriate amount of water is added, PVP and ammonia water are gradually added while stirring and mixed evenly, and then a mixed solution of tetraethyl orthosilicate and ethanol is added dropwise, stirring is continued at room temperature, the product is washed with water and centrifuged three times, and vacuum dried at room temperature to obtain a coating; (3) The coating and the polymer solution are mixed, a catalyst is added to heat the mixture for reaction, and the reaction product is washed and dried to obtain the mildew and antibacterial agent.

3. The mildew-proof and antibacterial organic silicon synthetic leather carpet material according to claim 2, characterized in that: The step (1) specifically comprises the following steps: uniformly dispersing the nano-alumina in ethanol with a mass concentration of 95 wt%, then uniformly dropping a passivating agent with a mass concentration of 1-3 % of the mass of the nano-alumina into the ethanol, heating to 60° C., stirring and keeping warm for 1-5 hours after the dropping is completed within 1 hour, centrifuging the solution and taking out the precipitate, washing it at least 3 times and then drying it at 45° C.

4. The mildew-proof and antibacterial organic silicon synthetic leather carpet material according to claim 2, characterized in that: The step (2) specifically comprises dispersing the precipitate into an ethanol solution with a mass concentration of 75 wt% at a volume ratio of 1:5, adding PVP and ammonia water and mixing them evenly, then dripping a mixed solution of ethyl orthosilicate and ethanol of an equal volume to the uniform system within 1 hour, continuing to stir at room temperature for 12-24 hours, washing with water and centrifuging three times, and vacuum drying at room temperature for 24-48 hours to obtain a coating.

5. The mildew-proof and antibacterial organic silicon synthetic leather carpet material according to claim 4, characterized in that: The dosage of the PVP is 0.2-5 g / L, the dosage of the ammonia water is 100-200 ml / L, and the concentration of TEOS in the mixed solution of tetraethyl orthosilicate and ethanol is 1-3 mol / L.

6. The mildew-proof and antibacterial organic silicon synthetic leather carpet material according to claim 5, characterized in that: The step (3) is specifically as follows: mixing the coating and the polymer solution in a volume ratio of 1:5, adding a sufficient amount of catalyst ethyl acetate, heating to 140° C. for reaction, and washing and drying the reaction product to obtain the mildew and antibacterial agent.

7. The mildew-proof and antibacterial organic silicon synthetic leather carpet material according to claim 2, characterized in that: The preparation process of the polymer solution is specifically as follows: triethyl phosphate, dimethyl fumarate and vinyl acetate are mixed, and the mixture is obtained under the initiation of ammonium persulfate, wherein, by mass percentage, the amount of dimethyl fumarate is 0.5-2%, the amount of vinyl acetate is 2-3%, and the balance is triethyl phosphate.

8. A method for preparing the mildew-proof and antibacterial organosilicon synthetic leather carpet material according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) mixing the components of the silicone base layer uniformly, coating it on a release paper and heating it with hot air; (2) adding a mixture of DMF solvent, additives and pigments to the polyurethane resin, degassing, coating on the base fabric, and then putting it into water, the DMF solvent is replaced by water, the polyurethane resin is gradually solidified, and a polyurethane base layer is formed; (3) coating the adhesive layer on the silicone base layer and placing the polyurethane base layer on the adhesive layer, followed by heating with hot air, peeling off the release paper after cooling, trimming and performing post-finishing to obtain the silicone synthetic leather carpet material.

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