Slow-release microcapsule and preparation method thereof, faucet material and electroplated plastic faucet

Abstract

The invention discloses a sustained-release microcapsule and a preparation method thereof, a faucet material and an electroplated plastic faucet, the sustained-release microcapsule comprises a capsule core and a capsule wall, the capsule core is a scale inhibitor and / or an antibacterial agent, the scale inhibitor is one or two of sodium polyepoxysuccinate and sodium polyaspartate, the antibacterial agent is a quaternary ammonium salt antibacterial agent with an alkyl chain containing 12-20 carbons, and the capsule wall is one or two of sodium polyepoxysuccinate and sodium polyaspartate. The capsule wall is made of a composite material of hydroxylated polyhedral oligomeric silsesquioxane POSS-OH and polyvinyl alcohol. The scale inhibitor and the antibacterial agent are enveloped by utilizing a cage-shaped cavity structure of the polyhedral oligomeric silsesquioxane, and after enveloping, the scale inhibitor and the antibacterial agent are both firmly enveloped in a cavity of the polyhedral oligomeric silsesquioxane, so that the high temperature resistance and the water-soluble disintegration resistance of the scale inhibitor and the antibacterial agent are improved, the scale inhibitor and the antibacterial agent can be slowly released outwards in different use scenes, and the scale inhibitor and the antibacterial agent can be used for preparing the scale inhibitor and the antibacterial agent. The long-term anti-scale and anti-bacterial functions are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and particularly to a sustained-release microcapsule, a preparation method thereof, a faucet material, and a plated plastic faucet. Background Art

[0002] With the development of polymer material modification technology, electroplated plastics that can be used to prepare faucet fittings have been developed at present, such as electroplated nylon (PA), electroplated acrylonitrile-butadiene-styrene (ABS), and electroplated polypropylene (PP), etc., and various faucet components have been successfully prepared. Compared with metal parts, plastic electroplated products can not only achieve a good metallic texture, but also are easy to form various complex shapes. However, during the use in the kitchen and bathroom space, due to the poor control of water hardness in various places, especially in the areas with high water hardness in North China and Northwest China, scale is likely to form on the inner walls of faucet pipes and fittings, and at the same time, bacteria will breed, bringing potential safety hazards to water use.

[0003] At present, the main solution to the scale problem is to configure a device that can hold a scale inhibitor before the water body enters the faucet cavity, and the scale inhibitor in the device is used to remove scale and purify the water body. Although this method can remove scale and purify the water body to a certain extent, it is necessary to replace the scale inhibitor regularly, and the disassembly is inconvenient and time-consuming. Summary of the Invention

[0004] The present invention aims to at least partly solve one of the above technical problems in the related art. For this purpose, the present invention provides a sustained-release microcapsule, a preparation method thereof, a faucet material, and a plated plastic faucet. By using the cage-like cavity structure of cage-type polyhedral oligomeric silsesquioxane to envelope the scale inhibitor and the antibacterial agent, after encapsulation, both the scale inhibitor and the antibacterial agent are firmly encapsulated in the cavity of the cage-type polyhedral oligomeric silsesquioxane, improving the high-temperature resistance and anti-water-soluble disintegration performance of the scale inhibitor and the antibacterial agent, and can be slowly released outward under different use scenarios, achieving a long-term scale and antibacterial function.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] The present invention provides a sustained-release microcapsule, including a core and a wall. The core is a scale inhibitor and / or an antibacterial agent. The scale inhibitor is one or two of polyepoxysuccinic acid sodium and sodium polyaspartate. The antibacterial agent is a quaternary ammonium salt antibacterial agent with an alkyl chain containing 12 to 20 carbons. The wall is made of a composite material of hydroxylated cage-type polyhedral oligomeric silsesquioxane POSS-OH and polyvinyl alcohol.

[0007] In some embodiments of the present invention, the mass ratio of POSS-OH, polyvinyl alcohol, scale inhibitor, and antibacterial agent is (5 - 10) : (6 - 10) : (2 - 10) : (0.2 - 1.0).

[0008] The present invention also provides a method for preparing the sustained-release microcapsule, comprising the following steps:

[0009] S1: dispersing vinyl cage-type polysilsesquioxane in a first organic solvent, adding an acid solution and hydrogen peroxide, carrying out a hydroxylation reaction under heating conditions, and then filtering, washing and drying to obtain a hydroxylated cage-type polysilsesquioxane POSS-OH;

[0010] S2: POSS-OH is dispersed in a second organic solvent, a scale inhibitor and / or an antibacterial agent, and polyvinyl alcohol are added, heated and stirred at high speed to form a dispersion system, a pH regulator is added to adjust the pH to 5-8, and stirred at low speed until the solvent evaporates to obtain a suspension; the high-speed stirring speed is 1500rpm-2500rpm, and the low-speed stirring speed is 500rpm-1000rpm;

[0011] S3: The suspension is centrifuged, and the obtained solid is washed and dried to obtain the sustained-release microcapsules.

[0012] Reaction principle:

[0013] Step S1: A two-step epoxidation-hydrolysis reaction occurs to convert the vinyl group of the vinyl cage polysilsesquioxane into a hydroxyl group, and finally obtain hydroxylated POSS (POSS-OH). Specifically, an acid solution is used as a catalyst. Under acidic conditions, hydrogen peroxide reacts with acid to generate peroxy acid. As a strong electrophilic reagent, the peroxy acid has high reactivity and can attack the vinyl double bond of the vinyl cage polysilsesquioxane to form an epoxidation intermediate. Under acidic and heating conditions, the epoxidation intermediate is ring-opened to generate a vicinal diol, i.e., two adjacent hydroxyl groups.

[0014] Step S2: The second organic solvent is compatible with POSS-OH and fully dispersed to obtain a stable POSS-OH solution; the quaternary ammonium salt antibacterial agent has a polar cationic head (quaternary ammonium group) and a hydrophobic tail (long chain alkyl C 12 -C 20),(the polar cationic head combines with the hydroxyl group of POSS-OH through hydrogen bonding, and the hydrophobic alkyl chain embeds into the hydrophobic cavity (Si-O-Si cage structure) of POSS; sodium polyepoxysuccinate (PESA) and sodium polyaspartate (PASP) are non-phosphorus environmental scale inhibitors, and their polar groups such as carboxylic acid groups combine with the hydroxyl group of POSS-OH through hydrogen bonding, while other non-polar groups embed into the hydrophobic cavity of POSS; polyvinyl alcohol (PVA) is used as a surfactant and film-forming agent. The long chain of PVA adsorbs on the surface of POSS-OH particles, reducing the interfacial tension, stabilizing the emulsion droplets, preventing aggregation, and at the same time forming an outer layer film, jointly constructing a capsule wall structure with POSS; high-speed stirring uses high-speed shear force to form nano- to micron-sized droplets, ensuring the uniform dispersion of the scale inhibitor / antibacterial agent and its preliminary embedding into the POSS-OH structure; adjusting the pH to near neutral is beneficial for the hydroxyl groups (-OH) of PVA and POSS-OH to maintain the protonated state, promoting hydrogen bond formation and maintaining the stability of the microcapsule structure; under low-speed stirring, the organic solvent gradually volatilizes, and the system changes from homogeneous to heterogeneous. PVA and POSS-OH aggregate due to reduced solubility, wrapping the scale inhibitor / antibacterial agent to form a capsule wall-capsule core structure.

[0015] Step S3: Centrifugal separation: Separate the unenveloped scale inhibitor / antibacterial agent and free PVA through density difference, and retain the intact microcapsules. Washing: Remove the adsorbed impurities on the surface with a low-polarity solvent, and the low-polarity solvent prevents the destruction of the capsule wall.

[0016] In some embodiments of the present invention, in step S1, the first organic solvent is at least one of tetrahydrofuran, dimethyl sulfoxide, N,N-dimethylformamide, or N-methylpyrrolidone.

[0017] In some embodiments of the present invention, in step S1, the molar ratio of hydrogen peroxide to vinyl in vinyl-caged polyhedral oligomeric silsesquioxane is greater than 1, and the addition amount of the acid accounts for 0.5%-1.5% of the total mass of the reaction materials. Further, the molar ratio of hydrogen peroxide to vinyl in vinyl-caged polyhedral oligomeric silsesquioxane is (1.2-1.5):1.

[0018] In some embodiments of the present invention, in step S1, the heating temperature is 60°C-80°C, and the reaction time is 2h-5h.

[0019] In some embodiments of the present invention, in step S2, POSS-OH is dispersed in the second organic solvent by ultrasonic treatment for 20min-40min.

[0020] In some embodiments of the present invention, in step S2, the second organic solvent is at least one of ethanol, propanol, isopropanol, or butanol.

[0021] In some embodiments of the present invention, in step S2, the heating temperature is 60°C - 80°C, and the high-speed stirring time is 1h - 2h.

[0022] In some embodiments of the present invention, in step S2, the molecular weight of the polyvinyl alcohol is 2000 - 20000.

[0023] In some embodiments of the present invention, in step S2, the pH is adjusted to 6 - 7. Further, the pH regulator is formic acid or ammonia water.

[0024] In some embodiments of the present invention, in step S2, the mesh number of the scale inhibitor and / or antibacterial agent is 800 - 3000 mesh. If the mesh number is too small, that is, the particle size is too large, it is not easy to dissolve and diffuse during the preparation of the microcapsules. If the mesh number is too large, that is, the particle size is too small, agglomeration is likely to occur.

[0025] In some embodiments of the present invention, in step S3, the drying temperature is 35°C - 45°C.

[0026] In some embodiments of the present invention, in step S3, the solvent used for washing is at least one of ethanol, n-butanol or acetone. PVA is hydrophilic, and washing with an organic solvent with a lower polarity will not damage the structure of the microcapsules.

[0027] The present invention also provides a faucet material, comprising the following raw materials: the slow-release microcapsules, filler, plastic resin and functional additives.

[0028] In some embodiments of the present invention, the mass ratio of POSS-OH, filler, plastic resin and functional additives is (5 - 10):(10 - 30):(80 - 100):(0.5 - 2.0). Further, the functional additives include at least one of a compatibilizer or a lubricant.

[0029] In some embodiments of the present invention, the filler is at least one of a silicate mineral, a carbonate mineral, a borate or a metal oxide.

[0030] In some embodiments of the present invention, the plastic resin is polypropylene (PP), acrylonitrile-butadiene-styrene (ABS) or nylon (PA).

[0031] In some embodiments of the present invention, the mesh number of the filler is 800 - 3000 mesh.

[0032] In some embodiments of the present invention, the faucet material is prepared by the following process: uniformly stirring a slow-release microcapsule, a filler, a plastic resin, and a functional additive at a high speed, and then subjecting the mixture to high-temperature melt extrusion granulation using a twin-screw extruder to obtain the faucet material. Further, the processing temperature of the twin-screw extruder is 200 - 300 °C, and the rotation speed is 100 - 500 rpm.

[0033] The present invention also provides a plated plastic faucet, which includes a faucet base body and a metal plating layer attached to the surface of the faucet base body. The faucet base body is made of the faucet material. Further, the faucet material is injection-molded at a high temperature by an injection molding machine to obtain the faucet base body, and then the faucet base body is roughened, degreased, and electroplated to obtain the plated plastic faucet. Further, the metal plating layer is a copper layer, a nickel layer, or a chromium layer, and the thickness is 1 μm - 20 μm. Further, the injection molding temperature is 230 - 300 °C, and the injection pressure is 0.2 - 1.0 MPa. After PVA is combined with POSS, the overall heat resistance is improved, and the capsule wall will not be damaged even at the high temperatures of melt extrusion and injection molding.

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

[0035] The present invention utilizes the cage structure of polyhedral oligomeric silsesquioxane to form the capsule wall of the microcapsule together with polyvinyl alcohol, and the scale inhibitor / antibacterial agent is used as the core of the capsule. The anti-scale and antibacterial slow-release microcapsules are prepared by emulsion stirring. Specifically, the non-polar segments of the scale inhibitor / antibacterial agent are embedded in the hydrophobic cavity formed by the Si-O-Si cages in the polyhedral oligomeric silsesquioxane, and the hydroxyl groups on the periphery of the Si-O-Si cages are combined with the polar groups of the scale inhibitor / antibacterial agent through hydrogen bonds to complete the encapsulation of the core of the capsule. PVA forms a cross-linked network on the polyhedral oligomeric silsesquioxane to provide a slow-release barrier and control the diffusion rate of the core of the capsule. The slow-release microcapsule and the plastic resin are used to prepare a faucet material that can be electroplated through high-temperature melt extrusion. The slow-release mechanism involves two processes: (1) During the use of the faucet, water seeps into the plastic substrate through the micropores on the material surface, gradually swelling the PVA shell and releasing the scale inhibitor / antibacterial agent, and then the scale inhibitor / antibacterial agent diffuses into the external environment through the voids of the matrix resin; (2) The microcapsules located inside the matrix resin also generate a concentration difference and continuously migrate to the outer surface of the faucet to supplement. Due to the hydrophilicity of PVA, under the continuous impact of water flow, the microcapsules will gradually "break the wall", and the scale inhibitor / antibacterial agent will be slowly released accordingly, exerting a longer-lasting anti-scale and antibacterial effect.

[0036] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Specific Embodiments

[0037] The concept of the present invention and the resulting technical effects will be clearly and completely described below in conjunction with the embodiments, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0038] Table 1 Faucet Material Formula

[0039]

[0040] Related Explanation of Table 1:

[0041] The vinyl silsesquioxane contains eight vinyl groups, the molecular weight of polyvinyl alcohol is 6000, the alkyl chain of the quaternary ammonium salt antibacterial agent contains 14 carbons, the mesh number of polyepoxysuccinic acid sodium and the quaternary ammonium salt antibacterial agent is 1500 mesh, the mesh number of talc powder is 1000 mesh, and the functional auxiliary agent is a compatibilizer and a lubricant with a mass ratio of 1:0.5.

[0042] The faucet materials of Examples 1-8 were prepared according to the following steps:

[0043] (1) Disperse vinyl caged silsesquioxane in a tetrahydrofuran solvent, then add a sulfuric acid solution as a catalyst and hydrogen peroxide as a hydroxylation reagent, heat to 70 °C with stirring, keep the temperature constant for 3 h, then filter, wash, and dry to obtain hydroxylated caged silsesquioxane POSS-OH; the molar ratio of hydrogen peroxide to vinyl in vinyl caged silsesquioxane is 1.3, and the addition amount of sulfuric acid accounts for 0.5%-1.5% of the total mass of the reaction materials.

[0044] (2) Disperse POSS-OH in ethanol, perform ultrasonic treatment for 30 min to obtain a stable POSS-OH solution, add polyepoxysuccinic acid / quaternary ammonium salt antibacterial agent and polyvinyl alcohol, stir at a high speed of 1500 rpm and gradually heat to 70 °C, keep the temperature constant for 2 hours to form a uniform dispersion system, then add a pH regulator to adjust the pH to 7, and stir at a low speed of 500 rpm until the solvent evaporates to obtain a suspension.

[0045] (3) Centrifuge the suspension, wash the obtained solid with acetone, and dry it at a constant temperature of 40 °C to obtain slow-release microcapsules.

[0046] (4) Mix the slow-release microcapsules, talc powder, PA66, and functional auxiliary agent obtained in step (3), stir evenly at a high speed, and then extrude and pelletize by high-temperature melting using a twin-screw extruder to obtain the faucet material.

[0047] The faucet material of Comparative Example 1 was prepared according to the following steps:

[0048] Mix polyepoxysuccinic acid sodium, quaternary ammonium salt antibacterial agent, talcum powder, PA66 and functional additives, and stir them evenly at high speed. Then, extrude and pelletize them through high-temperature melting using a twin-screw extruder to obtain the faucet material.

[0049] The faucet material of Comparative Example 2 was prepared according to the following steps:

[0050] (1) Disperse vinyl cage-like polyhedral oligomeric silsesquioxane in tetrahydrofuran solvent, then add sulfuric acid solution as a catalyst and hydrogen peroxide as a hydroxylation reagent. Stir and heat to 70 °C, keep the temperature constant for 3 h, then filter, wash and dry to obtain hydroxylated cage-like polyhedral oligomeric silsesquioxane POSS-OH; the molar ratio of hydrogen peroxide to vinyl in vinyl cage-like polyhedral oligomeric silsesquioxane is 1.3, and the addition amount of sulfuric acid accounts for 0.5%-1.5% of the total mass of the reaction materials.

[0051] (2) Disperse POSS-OH in ethanol, perform ultrasonic treatment for 30 min to obtain a stable POSS-OH solution, add polyepoxysuccinic acid and quaternary ammonium salt antibacterial agent, stir at 1500 rpm and gradually heat to 70 °C, keep the temperature constant for 2 h, then add a pH regulator to adjust the pH to 7, and stir at 500 rpm at a low speed until the solvent evaporates to obtain a mixed solution.

[0052] (3) Centrifuge the suspension, wash the obtained solid with acetone, and dry it at a constant temperature of 40 °C to obtain a composite material.

[0053] (4) Mix the composite material obtained in step (3), talcum powder, PA66 and functional additives, stir them evenly at high speed, and then extrude and pelletize them through high-temperature melting using a twin-screw extruder to obtain the faucet material.

[0054] The preparation method of the faucet material of Comparative Example 3 is the same as that of the Example, except that talcum powder is not added in step (4) of Comparative Example 3.

[0055] Comparative Example 4

[0056] A faucet material was prepared in this comparative example. The difference from Example 1 is that the vinyl polyhedral oligomeric silsesquioxane was not subjected to hydroxylation modification treatment. The specific process is as follows:

[0057] (1) Disperse vinyl polyhedral oligomeric silsesquioxane in ethanol, perform ultrasonic treatment for 30 min, add polyepoxysuccinic acid, quaternary ammonium salt antibacterial agent and polyvinyl alcohol, stir at 1500 rpm and gradually heat to 70 °C, keep the temperature constant for 2 h to form a uniform dispersion system, then add a pH regulator to adjust the pH to 7, and stir at 500 rpm at a low speed until the solvent evaporates to obtain a suspension.

[0058] (2) Centrifuge the suspension, wash the obtained solid, and dry it at a constant temperature of 40 °C to obtain a composite material.

[0059] (3) Mix the composite material, talcum powder, PA66, and functional additives obtained in step (2), and stir them evenly at high speed. Then, extrude and pelletize them through a twin-screw extruder under high-temperature melting to obtain the faucet material.

[0060] Test Examples

[0061] The faucet materials prepared in the examples and comparative examples were respectively injection-molded into faucet substrates at high temperature by an injection molding machine. Then, the faucet substrates were roughened, degreased, and nickel-plated with a nickel layer thickness of 3 μm to obtain electroplated plastic faucet test samples. The performance of the faucet materials prepared in this test example for the examples and comparative examples was tested, and the test methods are as follows:

[0062] 1. Antibacterial Test

[0063] (1) Antibacterial performance test: Test according to the method of GB / T 31402-2015.

[0064] (2) Antibacterial durability test: After placing the test samples prepared with different dosages in a 55°C water environment for 20 days, test the antibacterial performance of the samples according to the above antibacterial performance detection method.

[0065] 2. Flexural Performance Test

[0066] Test according to the provisions of GB / T 9341 "Plastics - Determination of flexural properties". Use a microcomputer-controlled electronic universal testing machine to test the flexural strength and evaluate the influence of the formulation system on the flexural performance. The greater the flexural performance, the better the rigidity of the product.

[0067] 3. Tensile Performance Test

[0068] Test according to the provisions of GB / T 1040.1-2018 "Plastics - Determination of tensile properties". Use a microcomputer-controlled electronic universal testing machine to test the tensile strength and evaluate the influence of the formulation system on the tensile performance.

[0069] 4. Scale Inhibition Test.

[0070] Test according to the provisions of GB / T 16632-2008 "Determination of scale inhibition performance of water treatment agents - Calcium carbonate deposition method". Install the sample, provide a water supply pressure of 0.55 MPa, a hardness water source with a calcium carbonate delivery concentration of 500 mg / mL in the water, let the water outlet stand for 12 h after 30 min of water outlet, and after 60 cycles, test the scale inhibition rate. The higher the scale inhibition rate, the better the long-term scale inhibition effect of the material.

[0071] Scale inhibition rate calculation formula: Scale inhibition rate = (1 - (A - B) / A) * 100%

[0072] Among them, A represents the calcium carbonate salt concentration of the untreated water sample, with the unit of mg / mL; B represents the calcium carbonate salt concentration of the treated water sample, with the unit of mg / mL.

[0073] 5. Electroplating performance test

[0074] (1) Adhesion test

[0075] Referring to the requirements for the adhesion strength of the coating in GB / T18145, first place the specimen in an environment of (70±2)°C, keep it for 30 minutes and then take it out, keep it at 15 - 20°C for 15 minutes, then put it into an environment of -25 - -30°C, keep it for 30 minutes and take it out, keep it at 15 - 20°C for 15 minutes. The above process is one cycle. After continuously performing 5 cycles, check the surface condition of the coating.

[0076] (2) Cross - cut test

[0077] Use a cross - cut blade to make 1mm×1mm square grids (10×10 lines) on the test piece. The cutting depth must cut through the electroplating layer to the substrate surface. Then use a pressure - sensitive adhesive tape with a width of 25mm and an adhesion of 10±1N / 25mm to stick tightly to the surface of the cut marks. After sticking for 5 minutes, tear off the adhesive tape smoothly at an angle of 60° within 0.5 - 1s, and then observe the peeling off situation of the plating / coating in the cross - cut area. Grade 0 is the highest.

[0078] (3) Acid salt spray test

[0079] Referring to the method and requirements of acid salt spray test specified in GB / T10125 "Corrosion tests in artificial atmospheres - Salt spray tests", after the test, the surface coating should not show peeling or blistering phenomena. Neutral for 48H, evaluate the appearance grade of the electroplated surface according to GB / T6461 "Rating of specimens and test pieces after corrosion tests for metallic and other inorganic coatings on metallic substrates". Grade 10 is the highest.

[0080] Table 2 Test results

[0081]

[0082] Table 3 Test results

[0083]

[0084] Analysis of test results: From Examples 1 - 8, with the increase of the content of polyepoxysuccinic acid sodium encapsulated by the POSS - OH and polyvinyl alcohol combination in the formulation system and the content of the antibacterial agent, the scale inhibition rate, initial antibacterial performance and high - temperature boiling persistent antibacterial performance of the product will be correspondingly improved.

[0085] In Comparative Example 1, slow-release microcapsules were not prepared, and the antibacterial agent and scale inhibitor were directly added to the faucet material. As a result, the antibacterial persistence and scale inhibition rate were significantly reduced. This is because the unencapsulated scale inhibitor and antibacterial agent would be quickly released into the water, showing good initial effects but being quickly depleted, and thus unable to maintain the anti-scaling and antibacterial functions in the long term. Since cage-shaped polyhedral oligomeric silsesquioxane itself can enhance the mechanical properties of the material, cage-shaped polyhedral oligomeric silsesquioxane was not added in Comparative Example 1, resulting in a decrease in its mechanical properties.

[0086] In Comparative Example 2, the scale inhibition rate of the antibacterial persistence was significantly reduced. This is because polyvinyl alcohol was not added, making it difficult to form a complete wall-core structure. Only relying on the hydrophobic cavity of POSS-OH to embed the antibacterial agent and scale inhibitor, a continuous and dense barrier could not be formed, and the antibacterial agent and scale inhibitor were prone to leakage, greatly reducing the slow-release effect.

[0087] In Comparative Example 3, talcum powder was not added, resulting in a decrease in its mechanical properties and electroplating properties. This is because talcum powder is a functional filler, and its surface oxygen-containing polar groups (such as hydroxyl groups) can increase the micro-pits on the material surface, thereby increasing the surface area and enhancing the mechanical anchoring effect, making it more convenient for the plating solution to "electrodecorrode" the substrate to form a stable electroplating layer and enhancing the adhesion of the coating.

[0088] In Comparative Example 4, the scale inhibition rate of the antibacterial persistence was significantly reduced. This is because the vinyl cage-shaped polyhedral oligomeric silsesquioxane was not hydroxylated, with low surface energy and low polarity, and poor compatibility with polyvinyl alcohol, antibacterial agent and scale inhibitor. The antibacterial agent and scale inhibitor could not be encapsulated, seriously affecting the slow-release effect.

[0089] The above has made a detailed description of the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention. In addition, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

Claims

1. A sustained-release microcapsule, characterized in that, It includes a core and a wall. The core is a scale inhibitor and / or an antibacterial agent. The scale inhibitor is one or both of polyepoxysuccinic acid sodium and sodium polyaspartate. The antibacterial agent is a quaternary ammonium salt antibacterial agent with an alkyl chain containing 12 to 20 carbons. The wall is made of a composite material of hydroxylated cage-like polyhedral oligomeric silsesquioxane POSS-OH and polyvinyl alcohol.

2. The sustained-release microcapsule according to claim 1, wherein The mass ratio of POSS-OH, polyvinyl alcohol, scale inhibitor and antibacterial agent is (5-10):(6-10):(2-10):(0.2-1.0).

3. The preparation method of the sustained-release microcapsules according to any one of claims 1-2, characterized in that, It includes the following steps: S1: Disperse vinyl cage-like polyhedral oligomeric silsesquioxane in a first organic solvent, add an acid and hydrogen peroxide, carry out hydroxylation reaction under heating conditions, then filter, wash and dry to obtain hydroxylated cage-like polyhedral oligomeric silsesquioxane POSS-OH; S2: Disperse POSS-OH in a second organic solvent, add a scale inhibitor and / or an antibacterial agent, and polyvinyl alcohol, heat and stir at a high speed to form a dispersion system, then add a pH regulator to adjust the pH to 5-8, and stir at a low speed until the solvent volatilizes to obtain a suspension; the high-speed stirring speed is 1500 rpm - 2500 rpm, and the low-speed stirring speed is 500 rpm - 1000 rpm; S3: Centrifuge the suspension, and wash and dry the obtained solid to obtain the sustained-release microcapsule.

4. The preparation method according to claim 3, characterized in that, In step S1, the molar ratio of hydrogen peroxide to vinyl in vinyl cage-like polyhedral oligomeric silsesquioxane is greater than 1, and the addition amount of the acid accounts for 0.5% - 1.5% of the total mass of the reaction materials.

5. The preparation method according to claim 3, characterized in that, In step S1, the heating temperature is 60°C - 80°C, and the reaction time is 2 h - 5 h.

6. The preparation method according to claim 3, wherein, In step S2, the second organic solvent is at least one of ethanol, propanol, isopropanol or butanol.

7. The preparation method according to claim 3, characterized in that, In step S2, the heating temperature is 60°C - 80°C, and the high-speed stirring time is 1 h - 2 h.

8. The preparation method according to claim 3, characterized in that, In step S2, the molecular weight of the polyvinyl alcohol is 2000 - 20000.

9. A faucet material, characterized in that, It includes the following raw materials: the sustained-release microcapsule according to any one of claims 1-2, a filler, a plastic resin and a functional additive.

10. An electroplated plastic faucet, characterized in that, It includes a faucet matrix and a metal electroplating layer attached to the surface of the faucet matrix. The faucet matrix is made of the faucet material according to claim 9.

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