Antibacterial Anti-scale silica gel material, and preparation method therefor and use thereof

Abstract

Disclosed in the present application are an antibacterial anti-scale silica gel material, and a preparation method therefor and the use thereof. Raw materials for preparing the silica gel material comprise a component A and a component B, wherein the component A comprises vinyl polysiloxane, a first silane coupling agent, fumed silica and a platinum catalyst; and the component B comprises vinyl polysiloxane, a first silane coupling agent, fumed silica, hydrogen-containing polysiloxane, an inhibitor and a composite scale-inhibiting antibacterial material, the composite scale-inhibiting antibacterial material being prepared by encapsulating a scale inhibitor and an antibacterial agent in cyclodextrin. In the present invention, the scale inhibitor and the antibacterial agent are encapsulated in cyclodextrin under certain conditions so as to prepare the composite scale-inhibiting antibacterial material; then, under the action of the platinum catalyst, the composite scale-inhibiting antibacterial material undergoes graft polymerization with the vinyl polysiloxane, and the vinyl polysiloxane also undergoes a homopolymerization and autopolymerization reaction, thereby preparing a silica gel material bonded with an antibacterial anti-scale sustained-release body; and the prepared silica gel material ensures that the scale inhibitor and the antibacterial agent can be slowly released outwards in a usage scenario, thereby achieving long-term scale-inhibiting and antibacterial effects.

Description

An antibacterial and antiscaling silicone material, its preparation method and application Technical Field

[0001] This invention relates to the field of silicone material technology, and in particular to an antibacterial and antiscaling silicone material, its preparation method, and its application. Background Technology

[0002] Currently, most showerhead spray nets are produced using silicone injection molding. Although silicone material has certain hydrophobic properties, the resulting products, after molding, generally exhibit poor hydrophobicity and are prone to scale buildup. This is mainly due to the surface structure of the mold, such as lack of polishing or fine lines, which reduces the smoothness of the silicone product's surface, making it easier for bacteria and scale to accumulate. Therefore, after long-term use, showerhead spray nets are prone to scale and bacterial growth on the water flow surface, especially at the nozzles, leading to changes in water flow or even blockages, thus reducing the user experience. Nowadays, people have increasingly higher demands for showerhead performance, especially regarding water flow characteristics (water pattern, pressure, and clogging). They want showerheads that are antibacterial and healthy, and also want a stable and consistent water flow without scale buildup. Currently, the main solution to showerhead clogging is to periodically scrub the spray net vigorously to remove scale for reuse. However, this method is laborious and significantly reduces the user experience. Summary of the Invention

[0003] This invention aims to at least partially solve one of the aforementioned technical problems in related technologies. To this end, this invention proposes an antibacterial and antiscaling silicone material, its preparation method, and its application. This material achieves both long-lasting antibacterial function and improves the antiscaling properties of showerheads, thereby meeting the needs of a wide range of consumers.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] This invention proposes a silica gel material, the raw materials of which include component A and component B. Component A includes: vinyl polysiloxane, a first silane coupling agent, fumed silica, and a platinum catalyst. Component B includes: vinyl polysiloxane, a first silane coupling agent, fumed silica, hydrogen-containing polysiloxane, an inhibitor, and a composite scale inhibitor and antibacterial material. The composite scale inhibitor and antibacterial material is prepared by encapsulating a cyclodextrin scale inhibitor and an antibacterial agent.

[0006] Cyclodextrin (CD) is a collective term for a series of cyclic oligosaccharides formed from amylose by cyclodextrin glucosyltransferase produced by Bacillus subtilis. It typically contains 6-12 D-glucanose units. X-ray diffraction, infrared spectroscopy, and nuclear magnetic resonance spectroscopy have confirmed that each D(+)-glucanose unit constituting a cyclodextrin molecule is in a chair conformation. Each glucose unit is linked by a 1,4-glycosidic bond to form a ring. Because the glycosidic bonds connecting the glucose units cannot rotate freely, cyclodextrin is not a cylindrical molecule but rather a slightly conical ring.

[0007] Cyclodextrin molecules have a slightly conical, hollow structure that is hydrophobic on the inside and hydrophilic on the outside. Two different types of hydroxyl groups are bonded along the upper and lower edges of the cyclodextrin ring. Secondary hydroxyl groups are bonded at the C-2 and C-3 positions of the glucose ring, located on the larger upper edge of the CD ring; primary hydroxyl groups are bonded via hydroxyl subunits at the C-6 position of the glucose ring, located on the smaller lower edge of the CD ring. The upper and lower edges of the CD ring are highly hydrophilic due to the presence of these hydroxyl groups. Conversely, the inner surface of the CD ring is embedded with less polar methylene and oxygen groups, making the inner surface more hydrophilic (i.e., hydrophobic). The CD ring is soluble in many polar solvents, including water, and can be modified through the derivatization of hydroxyl groups to obtain desired chemical and physical properties. It is this unique structure that allows cyclodextrins to act as "hosts" for compounds containing different "guests."

[0008] In some embodiments of the present invention, the scale inhibitor is polyaspartic acid (sodium), and the antibacterial agent is oligohydroxybutyrate. Polyaspartic acid (sodium) is in powder form with a particle size D50 of 0.5-5 μm and an effective content greater than 98%. Both polyaspartic acid (sodium) and oligohydroxybutyrate contain polar and non-polar groups, respectively, which can firmly "chelate" with the polar and non-polar groups of cyclodextrin, making it easier for polyaspartic acid (sodium) and oligohydroxybutyrate to be firmly encapsulated by cyclodextrin. Furthermore,

[0009] Sodium polyaspartic acid (PASP) is a water-soluble polymer and a novel green water treatment agent. It is phosphorus-free, non-toxic, pollution-free, and completely biodegradable. It has a strong chelating ability for ions, providing both corrosion inhibition and scale inhibition. It exhibits excellent scale inhibition effects on scale-forming salts such as calcium carbonate, calcium sulfate, barium sulfate, and calcium phosphate, achieving a scale inhibition rate of up to 100% for calcium carbonate. PASP can replace phosphorus-containing water treatment agents to avoid eutrophication and secondary pollution from discharge.

[0010] Oligohydroxybutyrate (OPHB) is an environmentally friendly and safe bio-based antibacterial agent. Its main raw material is PHBV (poly(3-hydroxybutyrate valerate)), a bio-based polymer material derived from non-GMO corn. OPHB is a non-ionic, bio-based, environmentally friendly organic antibacterial agent that can disrupt bacterial biofilms and cell walls, causing leakage of intracellular substances and killing bacteria. OPHB can also destroy the lipid proteins that encapsulate viral RNA, leading to viral death. Furthermore, this antibacterial agent is completely biodegradable under composting conditions, making it environmentally friendly. Therefore, OPHB antibacterial agent is environmentally friendly and safe.

[0011] The principle of this invention: Utilizing the slightly conical, hollow structure of cyclodextrin molecules ("hydrophobic inside, hydrophilic outside"), scale inhibitors and antibacterial agents are first encapsulated under certain conditions. Then, under the action of a platinum catalyst, they are grafted and polymerized with vinyl polysiloxane (MVMQ) to prepare an environmentally friendly, antibacterial, and scale-resistant silicone material. The following is a reaction principle diagram using β-cyclodextrin, PASP, and OPHB as examples:

[0012]

[0013] In some embodiments of the present invention, component A comprises, by weight, 30-80 parts vinyl polysiloxane, 3-8 parts first silane coupling agent, 30-50 parts fumed silica, and 0.2-1 parts platinum catalyst; component B comprises, by weight, 30-80 parts vinyl polysiloxane, 3-8 parts first silane coupling agent, 30-50 parts fumed silica, 2-10 parts hydrogen-containing polysiloxane, 0.1-0.6 parts inhibitor, and 1-10 parts composite scale inhibitor and antibacterial material. Further, the inhibitor is 0.3-0.5 parts.

[0014] In some embodiments of the present invention, the mass ratio of the cyclodextrin, scale inhibitor, and antibacterial agent is 6:(2-4):(0.5-2).

[0015] In some embodiments of the present invention, the composite scale inhibitor and antibacterial material is prepared by the following method: solid cyclodextrin is prepared into a cyclodextrin solution, a scale inhibitor and an antibacterial agent are added to the cyclodextrin solution, the resulting mixture is stirred at a temperature of 40-70°C, and after stirring, it is allowed to stand and then dried to obtain the composite scale inhibitor and antibacterial material. Further, the mass concentration of the cyclodextrin solution is 10%-40%. Further, the resulting mixture is stirred at a speed of 2000-2500 rpm at a temperature of 40-70°C for 2-4 hours.

[0016] In some embodiments of the present invention, the first silane coupling agent is at least one of dimethyldiethoxysilane, dimethyldimethoxysilane, dimethylcyclosiloxane, or hexamethyldisilazane.

[0017] In some embodiments of the present invention, the vinyl polysiloxane has a vinyl mass percentage of 0.2-1.0% and a viscosity of 5000-10000 mPa·s at 25°C.

[0018] In some embodiments of the present invention, the hydrogen mass percentage in the hydrogen-containing polysiloxane is 0.05-1%.

[0019] In some embodiments of the present invention, the platinum catalyst is at least one of tetramethyldivinyldisiloxane chloroplatinate complex, platinum-alkynyl complex, or isopropanol solution of chloroplatinic acid; the platinum content in the platinum catalyst is 1000-1500 ppm by mass.

[0020] In some embodiments of the present invention, the inhibitor is at least one selected from polyvinyl polysiloxanes, alkynyl alcohols, amides, or cyano compounds. Further, the alkynyl alcohol is at least one selected from 2-propyn-1-ol, methylbutynol, ethynylcyclohexanol, phenylbutynol, or 3,5-dimethyl-1-hexyn-3-ol.

[0021] In some embodiments of the present invention, the fumed silica is surface-treated fumed silica. The surface treatment process is as follows: the fumed silica is dried in a vacuum, and the dried fumed silica is fed into a fluidized bed reactor. Simultaneously, a second silane coupling agent is vaporized and introduced into the sulfurized bed reactor via an inert gas carrier to carry out a first reaction. After the first reaction, microcrystalline wax is fed into the fluidized bed reactor, and a second reaction is carried out at 170-230°C to obtain surface-treated fumed silica. The effective content of the microcrystalline wax is greater than 98%. Further, the drying time of the fumed silica in the vacuum is 3-5 hours. Further, the flow rate of the fumed silica fed into the fluidized bed reactor is 30-50 g / min, the flow rate of the second silane coupling agent introduced into the sulfurized bed reactor is 5-8 g / min, the vaporization temperature of the second silane coupling agent is 150-190°C, and the first reaction time is 1-3 hours. Furthermore, the flow rate of the microcrystalline wax fed into the fluidized bed reactor is 3-6 g / min, and the second reaction time is 2-4 h. Furthermore, the fumed silica has a SiO2 content greater than 99%, a D50 of 3-50 nm, and a specific surface area of ​​120-300 m². 2 / g. Further preferably, the D50 of the fumed silica is 8-17 nm.

[0022] In some embodiments of the present invention, the second silane coupling agent is at least one of alkoxysilane, vinylalkoxysilane, or chlorosilane. Further, the vinylalkoxysilane is at least one of vinyltrimethoxysilane or vinyldiethoxysilane; the alkoxysilane is at least one of hexamethylcyclotrisiloxane or octamethylcyclotetrasiloxane; and the chlorosilane is at least one of dimethyldichlorosilane or trimethylchlorosilane.

[0023] In some embodiments of the present invention, the mass ratio of the fumed silica, the second silane coupling agent and the microcrystalline wax is 6:(1-2):(0.5-1).

[0024] In some embodiments of the present invention, the cyclodextrin is at least one of α-cyclodextrin, β-cyclodextrin, or γ-cyclodextrin. α-cyclodextrin, β-cyclodextrin, and γ-cyclodextrin have 6, 7, and 8 D-glucopyranose units, respectively, are in powder form, have a particle size D50 of 0.3-5 μm, and an effective content greater than 99%.

[0025] In some embodiments of the present invention, the degree of polymerization of the oligohydroxybutyrate is 1-15. Preferably, the degree of polymerization of the oligohydroxybutyrate is 4-8.

[0026] The present invention also proposes a method for preparing the silicone material, comprising the following steps:

[0027] Preparation of component A: Mix and stir the first silane coupling agent, fumed silica and 30%-70% of the formulation amount of vinyl polysiloxane, then degas under vacuum, and then add the remaining formulation amount of vinyl polysiloxane and platinum catalyst and stir to obtain component A.

[0028] Preparation of component B: Mix and stir the first silane coupling agent, fumed silica and 30%-70% of the formulation amount of vinyl polysiloxane, then degas under vacuum, and then add the remaining formulation amount of vinyl polysiloxane, hydrogen-containing polysiloxane, inhibitor and composite scale inhibitor and antibacterial material and stir to obtain component B.

[0029] The silicone material is obtained by injection molding after mixing components A and B.

[0030] In some embodiments of the present invention, the mixing and stirring time is 1-4 hours.

[0031] In some embodiments of the present invention, the vacuum degassing is performed by stirring under vacuum conditions at 110-170°C for 1-4 hours.

[0032] In some embodiments of the present invention, the injection molding process conditions are: injection temperature of 90-160℃, injection time of 2-8 min, and injection pressure of 40-120 kg / cm².2 .

[0033] The present invention also proposes the application of the silicone material in shower head water outlet mesh or shower head nozzle.

[0034] According to a preferred embodiment of the present invention, at least the following beneficial effects are achieved:

[0035] This invention utilizes cyclodextrin to encapsulate scale inhibitors and antibacterial agents under certain conditions to prepare a composite scale inhibitor and antibacterial material. Since cyclodextrin has a typical conical cavity structure, it can act as a "host" to contain compounds of different "guests". After encapsulation, both the scale inhibitor and the antibacterial agent are firmly encapsulated in the cavity of the cyclodextrin. Then, under the catalysis of platinum, the cyclodextrin undergoes an addition grafting reaction with the unsaturated carbon-carbon double bond C=C of vinyl polysiloxane through the secondary hydroxyl groups at the C-2 and C-3 positions of the ring. At the same time, the vinyl polysiloxane also undergoes homopolymerization and self-polymerization reactions, finally obtaining a silicone material bonded with antibacterial and scale-reducing slow-release agents. Because cyclodextrin contains glucose units and is highly hydrophilic, it has poor compatibility with hydrophobic two-component liquid silica gel. Therefore, a grafting reaction is carried out between the highly active glucose units and vinyl polysiloxane to enhance the compatibility between the composite scale-inhibiting and antibacterial material and the two-component liquid silica gel system. This results in a more stable and effective antibacterial and scale-resistant silica gel material, ensuring that the scale inhibitor and antibacterial agent can be slowly released during use, achieving long-lasting scale inhibition and antibacterial effects.

[0036] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Detailed Implementation

[0037] The following will describe the concept and technical effects of the present invention clearly and completely with reference to embodiments, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention.

[0038] Table 1. Formula for antibacterial and anti-scaling silicone water jets in shower heads.

[0039]

[0040] Related explanations in Table 1:

[0041] (1) The vinyl mass percentage of the vinyl polysiloxane is 0.6%, and the viscosity at 25°C is 8000 mPa·s.

[0042] (2) The degree of polymerization of OPHB is 4.

[0043] (3) Preparation of surface-treated fumed silica: The preparation of antibacterial and waterproof silicone water outlet for shower heads includes the following steps: ordinary fumed silica is dried in a vacuum at 130°C for 4 hours, and then the dried fumed silica is fed into the sulfurized bed reactor at 30 g / min through a rotary feed valve. At the same time, the silane coupling agent vinyltrimethoxysilane is vaporized at 170°C at 5 g / min through a flow meter and then introduced into the reactor from the bottom of the sulfurized bed reactor using N2 as a carrier. The reaction is carried out for 2 hours. Then, microcrystalline wax is fed into the sulfurized bed reactor at 3 g / min through a flow meter. The reaction temperature is controlled at 190°C and the reaction is carried out for 2 hours. After standing, surface-treated fumed silica is obtained.

[0044] (4) Preparation of composite scale inhibitor and antibacterial material: Take powdered β-cyclodextrin to prepare a β-cyclodextrin solution with a mass concentration of 30%, place it in a reactor and let it stand. Then, add scale inhibitor polyaspartic acid (sodium) PASP and bio-based antibacterial agent oligohydroxybutyrate (OPHB) at room temperature. The mass ratio of β-cyclodextrin, scale inhibitor and antibacterial agent is 6:3:1. Stir continuously at 2000 rpm for 3 hours in a constant temperature water bath at 60℃. After stirring evenly, let it stand for 24 hours and dry to obtain composite scale inhibitor and antibacterial material.

[0045] The preparation of the antibacterial and waterproof scale-reducing silicone water outlet plate for a shower head includes the following steps:

[0046] (1) Preparation of liquid silica gel material

[0047] Preparation of component A:

[0048] First, add 60% of the formulated amount of vinyl polysiloxane, silane coupling agent and surface-treated fumed silica to a kneader, stir at room temperature for 2 hours, raise the temperature to 160°C, stir under vacuum for 2 hours, then stop the vacuum, continue to add the remaining amount of the formulated amount of vinyl polysiloxane for dilution, then add platinum catalyst, stir evenly to obtain component A.

[0049] Preparation of component B:

[0050] First, add 60% of the formulated amount of vinyl polysiloxane, silane coupling agent and fumed silica to a kneader, stir at room temperature for 2 hours, raise the temperature to 160℃, stir under vacuum for 2 hours, then stop the vacuum, continue to add the remaining amount of the formulated amount of vinyl polysiloxane for dilution, then add hydrogen-containing polysiloxane, inhibitor and composite scale inhibitor and antibacterial material and stir evenly to obtain component B.

[0051] (2) Molding of silicone shower head water outlet: The prepared components A and B are thoroughly mixed by a feeder at a mass ratio of 1:1 and then pumped into an injection molding machine. The silicone shower head water outlet is then manufactured using a prepared mold on the injection molding machine. The molding process conditions are as follows: injection temperature is 150℃, injection time is 5min, and injection pressure is 80kg / cm². 2 This yields an antibacterial and waterproof silicone shower head with water output.

[0052] Each embodiment and comparative example was prepared according to the formulation in Table 1 and the above preparation steps to obtain the corresponding samples.

[0053] This experiment tested the antibacterial properties, hardness, tensile properties, anti-scaling properties, and surface smoothness of the antibacterial and anti-scaling silicone showerheads prepared in the examples and comparative examples according to the following test methods. The results are shown in Table 2.

[0054] (1) Antibacterial test

[0055] Antibacterial performance test: Tested according to the method of GB / T 31402-2015.

[0056] Antibacterial durability test: After placing each test sample in a 70℃ water environment for 30 days, the antibacterial performance of the samples was tested according to the above-mentioned antibacterial performance test method.

[0057] (2) Shore A hardness test

[0058] The test was conducted according to GB / T531-2008 "Test Method for Shore A Hardness of Vulcanized Rubber". The Shore A hardness is used to evaluate the softness of the silicone showerhead blades.

[0059] (3) Tensile property test

[0060] The tensile strength was tested according to GB / T 1040.1-2018 "Determination of Tensile Properties of Plastics". A computer-controlled electronic universal testing machine was used to test the tensile strength and evaluate the influence of the formulation system on the tensile properties.

[0061] (4) Anti-scaling performance test

[0062] The test was conducted according to GB / T 16632-2008 "Determination of Scale Inhibition Performance of Water Treatment Agents - Calcium Carbonate Deposition Method". The sample was loaded with water at a pressure of 0.55 MPa. The concentration of calcium carbonate in the water was 1000 mg / mL (hardness source). After 30 minutes of effluent treatment and 12 hours of settling, this process was repeated for 60 cycles before testing the scale inhibition rate. A higher scale inhibition rate indicates a better scale-resistant effect of the material.

[0063] Formula for calculating scale inhibition rate: Scale inhibition rate = (1 - (AB) / A) * 100%

[0064] Where A represents the calcium carbonate concentration of the untreated water sample, in mg / mL; and B represents the calcium carbonate concentration of the treated water sample, in mg / mL.

[0065] (5) Friction coefficient test

[0066] The test was conducted according to GB / T 10006-2021 "Determination of Coefficient of Friction of Plastic Films and Sheets". The static and dynamic coefficients of friction are used to evaluate the smoothness of the material surface. The lower the coefficient of friction, the smoother the material surface, and the less likely bacteria and scale will accumulate on it.

[0067] Table 2 Performance Test Results

[0068]

[0069] From Examples 1-5, it can be seen that as the content of the composite scale-inhibiting and antibacterial material in the formulation system increases, the initial antibacterial performance and the long-lasting antibacterial performance after boiling in high temperature gradually improve, the scale inhibition rate also gradually increases, and the static and dynamic friction coefficients gradually decrease. When the content of the composite scale-inhibiting and antibacterial material in component B increases to 8%, the above properties are optimal. Among them, the initial antibacterial rate against Escherichia coli and Staphylococcus aureus and the long-lasting antibacterial rate after boiling in high temperature are greater than 99.9%, the Shore A hardness is 43A, the tensile strength is 6.1MPa, the scale inhibition rate measured by the calcium carbonate deposition method is increased to 95.32%, and the static and dynamic friction coefficients are reduced to 0.42 and 0.25, respectively. The decrease in friction coefficient is due to the fact that the glucose unit structure of cyclodextrin can react with water to form a film on the material surface that is conducive to hydration and lubrication, thereby reducing the overall resistance experienced by the friction surface.

[0070] As seen in Example 1 and Comparative Example 1, the scale inhibitor polyaspartic acid (sodium) PASP and the antibacterial agent OPHB exhibited the best performance after being encapsulated by cyclodextrin and then grafted onto vinyl polysiloxane. This is because cyclodextrin has a slightly conical cavity structure that is hydrophobic on the inside and hydrophilic on the outside, which can act as a "host" to encapsulate compounds of different "guests". After encapsulation, β-cyclodextrin undergoes an addition grafting reaction with the unsaturated carbon-carbon double bond C=C of vinyl polysiloxane through the secondary hydroxyl groups at the C-2 and C-3 positions of the glucose ring. After encapsulation and grafting, the scale inhibitor polyaspartic acid (sodium) PASP and the antibacterial agent OPHB can exert their scale inhibition and antibacterial effects for a long time, which is significantly different from the effect of not being encapsulated and remaining free outside the polymer system. Before encapsulation, PASP and OPHB contain many polar groups such as -NH- and -OH, which are highly hydrophilic and easily migrate to the surface in an aqueous environment, resulting in instantaneous loss and functional failure. After encapsulation, they are firmly placed in the spatial structure of cyclodextrin, and cyclodextrin is bonded to the silica gel system by grafting with vinyl polysiloxane, which can better exert the sustained-release effect.

[0071] From Examples 1 and Comparative Examples 2-4, it can be seen that during the reaction of cyclodextrin with vinyl polysiloxane, the secondary hydroxyl groups at the C-2 and C-3 positions of the glucose ring and the Si-H on the hydrogen-containing polysiloxane of the same component undergo copolymerization addition grafting reactions with the unsaturated carbon-carbon double bonds C=C. Simultaneously, the vinyl polysiloxane also undergoes homopolymerization and self-polymerization, resulting in a "competitive polymerization" between copolymerization and self-polymerization. This can be controlled by adjusting the content of the inhibitor 2-propyn-1-ol. Too little (as in Comparative Examples 2 and 3) or too much (as in Comparative Example 4) of the inhibitor 2-propyn-1-ol has adverse effects on the overall performance of the product. In this formulation system, a content of 0.5 parts of 2-propyn-1-ol in component B is more suitable.

[0072] As seen in Example 1 and Comparative Example 5, the surface treatment of fumed silica also affects product performance. After surface treatment with silane coupling agent and microcrystalline wax, the static and dynamic friction coefficients of the material decreased significantly, which to some extent reduced the probability of bacteria and scale deposition on the material surface. This is because the reaction between the silane coupling agent and the silanol groups of fumed silica connects the organic groups of the silane coupling agent to the surface of fumed silica, reducing the number of silanol groups on the surface of fumed silica, making it change from hydrophilic to hydrophobic, thereby improving its compatibility with organic matter and increasing its dispersibility in polymers, allowing it to better bond and fill the micropores on the surface of silica gel. At the same time, the introduction of microcrystalline wax changes the surface smoothness of fumed silica, making it more lubricated, making it less likely for bacteria and scale to deposit on the material surface, thus improving the antibacterial and anti-scaling properties of the product. In addition, the surface-treated fumed silica bonds more tightly and firmly with the two-component liquid silica gel resin, demonstrating a filling and reinforcing effect, thus improving hardness and tensile strength.

[0073] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

[0074] Type the free content description paragraph for the sequence list here.

Claims

1. A silica gel material, characterized by, The preparation raw materials include A component and B component, wherein the A component includes: vinyl polysiloxane, first silane coupling agent, fumed white carbon black and platinum gold catalyst; the B component includes: vinyl polysiloxane, first silane coupling agent, fumed white carbon black, hydrogen-containing polysiloxane, inhibitor and composite scale and bacteria resistant material; the composite scale and bacteria resistant material is prepared by cyclodextrin enveloping scale inhibitor and antibacterial agent.

2. The silica gel material according to claim 1, characterized in that, The scale inhibitor is polyaspartic acid (sodium); the antibacterial agent is oligomeric hydroxybutyric acid ester.

3. The silica gel material of claim 1, wherein, The A component is 30-80 parts of vinyl polysiloxane, 3-8 parts of first silane coupling agent, 30-50 parts of fumed white carbon black and 0.2-1 part of platinum gold catalyst by mass fraction; the B component is 30-80 parts of vinyl polysiloxane, 3-8 parts of first silane coupling agent, 30-50 parts of fumed white carbon black, 2-10 parts of hydrogen-containing polysiloxane, 0.1-0.6 parts of inhibitor and 1-10 parts of composite scale and bacteria resistant material by mass fraction.

4. The silica gel material of claim 1, wherein The mass ratio of the cyclodextrin, scale inhibitor and antibacterial agent is 6: (2-4): (0.5-2).

5. The silica gel material of claim 1, wherein The composite scale and bacteria resistant material is prepared by the following method: taking solid cyclodextrin to prepare cyclodextrin solution, adding scale inhibitor and antibacterial agent into the cyclodextrin solution, stirring the obtained mixture at a temperature of 40-70℃, standing after stirring is completed, and drying to obtain the composite scale and bacteria resistant material.

6. The silica gel material of claim 1, wherein The fumed white carbon black is surface treated fumed white carbon black, and the surface treatment process is: drying the fumed white carbon black in vacuum, feeding the dried fumed white carbon black into a fluidized bed reactor, and feeding microcrystalline wax into the fluidized bed reactor after the first reaction is completed, and carrying out the second reaction at 170-230℃ to obtain the surface treated fumed white carbon black.

7. The silica gel material of claim 6, wherein The mass ratio of the fumed white carbon black, second silane coupling agent and microcrystalline wax is 6: (1-2): (0.5-1).

8. The silica gel material of claim 1, wherein, The cyclodextrin is at least one of α cyclodextrin, β cyclodextrin or γ cyclodextrin.

9. The method of producing a silica gel material according to any one of claims 1 to 8, characterized by, The method includes the following steps: Preparation of A component: mixing and stirring the first silane coupling agent, fumed white carbon black and 30%-70% of the formula amount of vinyl polysiloxane, then vacuum degassing, and then adding the remaining formula amount of vinyl polysiloxane and platinum gold catalyst for stirring to obtain the A component; Preparation of B component: mixing and stirring the first silane coupling agent, fumed white carbon black and 30%-70% of the formula amount of vinyl polysiloxane, then vacuum degassing, and then adding the remaining formula amount of vinyl polysiloxane, hydrogen-containing polysiloxane, inhibitor and composite scale and bacteria resistant material for stirring to obtain the B component; Mixing the A component and the B component and then injection molding to obtain the silica gel material.

10. The application of the silica gel material in any one of claims 1-8 in a shower head water outlet net or a shower head water outlet nozzle.

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