Preparation method of antibacterial and scale-inhibiting microcrystalline particles for clean water tank

Abstract

The application discloses a kind of clear water tank antibacterial scale inhibition microcrystalline particle preparation methods, including surface layer organic antibacterial enrichment area, core scale inhibition and inorganic antibacterial area and adsorption material pore channel.The application compared with prior art's advantages are in that:the microcrystalline particle of the application has gradient functional structure, surface layer organic antibacterial enrichment area accounts for 10% of radius, and the mass fraction of organic antibacterial agent is higher than average value 1.5-3 times, realizes 30 minutes fast-acting bacteriostasis into water;Core scale inhibition and inorganic antibacterial area accounts for 90% of radius, and continuous phase is formed by adsorption material and binder sintering, scale inhibition powder and inorganic antibacterial agent are dispersed therein, provide long-acting scale inhibition and bacteriostasis;Three-dimensional communication pore channel is penetrated in the core, porosity is 15-35%, can load fragrance microcapsule, realizes inorganic and organic antibacterial agent cooperation, so that sewage does not pour and does not smell for 3-6 months, scale inhibition rate is greater than or equal to 95%, and particle structure is stable, with air freshening function, significantly improve user experience.

Description

Technical Field

[0001] This invention relates to the field of water treatment chemicals, specifically a method for preparing antibacterial and scale-inhibiting microcrystalline particles for clear water tanks. Background Technology

[0002] With the increasing popularity of smart homes, floor scrubbers, robotic vacuum cleaners, and other similar devices are gradually becoming the mainstays of household cleaning. These devices are typically equipped with a clean water tank and a wastewater tank. During operation, the water or detergent in the clean water tank is used for floor cleaning, and then it is collected in the wastewater tank.

[0003] Patent document CN111233176A discloses a scale-inhibiting particle, its preparation method, and its uses. The scale-inhibiting particle comprises scale-inhibiting powder, adsorbent material, and binder, wherein the binder is a combination of a water-soluble binder and a curing binder. The scale-inhibiting particle prepared by this invention has strong scale removal ability, long scale inhibition life, good water resistance, excellent water purification function, and good slow-release effect. It also allows for controllable release rate, has long-lasting effect, and the preparation process is simple and low-cost. It is suitable for scale inhibition treatment of water quality, especially for scale inhibition treatment of domestic water. However, the prior art has the following drawbacks:

[0004] (1) Existing technology has the problem of sewage tanks emitting odors. Because the sewage tanks are rich in organic pollutants (dust, food scraps, hair, etc.), bacteria can easily grow and produce foul odors in a closed and humid environment. If users fail to empty the tanks in time (such as when they are away on business for several days), the sewage tanks will often become seriously smelly and may even damage the internal pipes of the machine.

[0005] (2) Existing technology has the problem of scale buildup at the steam outlet. Mid- to high-end models are equipped with high-temperature steam cleaning function. Calcium and magnesium ions in the water are heated and precipitated at the heating element and nozzle, forming hard scale, which leads to nozzle blockage, flow rate reduction, affecting the cleaning effect and even damaging the machine.

[0006] (3) Existing technologies mostly use a single antibacterial agent. Inorganic antibacterial agents (such as silver-loaded zeolite) take effect slowly and require a certain amount of time to establish an effective antibacterial concentration after entering the water. Organic antibacterial agents (such as quaternary ammonium salts) take effect quickly but are consumed quickly, making it difficult to maintain a long-term antibacterial effect in the complex environment of the sewage tank.

[0007] (4) Existing scale inhibitor particles are mainly for industrial circulating water or water purifiers, and only have scale inhibition function. They do not take into account the unique dual-tank (clean water tank + sewage tank) relay antibacterial needs of sweepers / floor scrubbers, nor do they integrate fragrance function to improve user experience.

[0008] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to overcome the above-mentioned defects and provide a method for preparing antibacterial and scale-inhibiting microcrystalline particles for clear water tanks. The microcrystalline particles have a unique gradient functional structure. Through the compounding of inorganic and organic antibacterial agents and special spatial distribution, the whole process of hygiene control from clear water tank to wastewater tank is realized, and they also have scale inhibition and fragrance functions.

[0010] To solve the above-mentioned technical problems, the technical solution provided by the present invention is: a microcrystalline antibacterial and scale-inhibiting agent for a clean water tank, which is made of the following components by mass percentage, based on the total mass of the microcrystalline particles as 100%: scale-inhibiting powder 20-60%, inorganic antibacterial agent 5-25%, organic antibacterial agent 3-20%, adsorbent material 10-40%, and binder 10-30%.

[0011] The adhesive is composed of a water-soluble adhesive and a curing adhesive in a mass ratio of 0.5:1–200:1;

[0012] The organic antibacterial agent is a quaternary ammonium salt and / or a pyridinethione;

[0013] The microcrystalline particles, arranged radially from the outside in, include:

[0014] The surface organic antibacterial enrichment zone accounts for 10% of the particle radius, and the mass fraction of the organic antibacterial agent in this zone is 1.5–3 times higher than the average mass fraction of the particles.

[0015] The core scale inhibition and inorganic antibacterial zone, which accounts for 90% of the particle radius, is formed by sintering adsorbent material and binder to form a solid skeleton as a continuous phase, in which scale inhibition powder and inorganic antibacterial agent are dispersed.

[0016] The adsorbent material channels are three-dimensional interconnected irregular pores that penetrate the core scale inhibition and inorganic antibacterial zone, with a porosity of 15–35%.

[0017] Furthermore, the pores of the adsorbent material may be loaded with fragrance microcapsules, which are attached to the inner wall of the pores of the adsorbent material. When loaded, the fragrance microcapsules account for 0.5–5% of the total mass of the microcrystalline particles.

[0018] Furthermore, the wall material of the fragrance microcapsule is melamine resin or gum arabic, and the core material of the fragrance microcapsule is terpene or aldehyde fragrance.

[0019] Furthermore, the scale inhibitor powder is an inorganic scale inhibitor powder, which is prepared by sintering raw materials containing sodium polyphosphate, sodium carbonate, calcium source and ammonium dihydrogen phosphate in four stages and then treating them with a surfactant for hydrophobicity. The sodium polyphosphate is a combination of sodium hexametaphosphate and sodium tripolyphosphate in a mass ratio of 1:1–3:1.

[0020] Furthermore, the inorganic antibacterial agent is a silver ion-supported material and / or a zinc-based antibacterial material. The silver ion-supported material is one or more of silver-supported zeolite, silver-supported zirconium phosphate, and silver-supported activated carbon, with a silver content of 0.5–5% of the antibacterial agent mass. The zinc-based antibacterial material is tetraneedle-shaped zinc oxide whiskers and / or nano-zinc oxide.

[0021] Furthermore, the mass ratio of the inorganic antibacterial agent to the organic antibacterial agent is 1:0.5–1:4, wherein the quaternary ammonium salt in the organic antibacterial agent is selected from one or more of benzalkonium chloride, dicedyldimethylammonium chloride, and hexadecyltrimethylammonium bromide, and the pyridinethione is zinc pyridinethione.

[0022] Furthermore, the adsorbent material is one or more of carbon powder, diatomaceous earth, montmorillonite, silica, and alumina, with a mesh size of 200–1200 mesh; the water-soluble binder is selected from one or more of polyvinyl alcohol, starch, cellulose, and guar gum; and the curing binder is selected from one or more of polyethylene, polypropylene, epoxy resin, and polyurethane.

[0023] Another object of the present invention is to provide a method for preparing the above-mentioned microcrystalline particles, comprising the following steps:

[0024] S1. Take scale inhibitor powder, inorganic antibacterial agent, adsorbent material and binder according to the ratio, mix them, add deionized water and stir to obtain a mixture. The mass of deionized water is 20-60% of the total mass of solids.

[0025] S2. Premix 50-70% of the total amount of organic antibacterial agent with the mixture from step S1, and prepare the remaining 30-50% of the organic antibacterial agent into an aqueous solution, which is then sprayed onto the surface of the material before extrusion granulation.

[0026] S3. Extrude the material obtained in step S2 into granules with a particle size of 1–4 mm.

[0027] S4. Sinter the particles at 110–280℃ for 0.5–2h, then cool to obtain microcrystalline particles.

[0028] The method may further include step S5: loading fragrance microcapsules into the pores of the adsorption material of the particles obtained in step S4 by impregnation adsorption or spray coating, and drying at low temperature.

[0029] Preferably, the sintering temperature in step S4 is 150–200°C.

[0030] Another objective of this invention is to provide an application of the above-mentioned microcrystalline particles in the clean water tank and wastewater tank of a sweeper or floor scrubber, comprising the following steps: placing the microcrystalline particles in the clean water tank, dissolving them in water, and then entering the wastewater tank during the washing process, so that the wastewater does not need to be poured out or become smelly for 3-6 months, and also inhibiting scale and preventing clogging of the steam vent.

[0031] The advantages of this invention compared to the prior art are:

[0032] (1) In this invention, through the gradient design of “surface organic antibacterial enrichment zone + core inorganic antibacterial zone”, the organic antibacterial agent (quaternary ammonium salt, etc.) dissolves rapidly in the initial stage of water entry. The organic antibacterial agent can kill more than 99.9% of the bacteria in the water within 30 minutes of water entry, while the inorganic antibacterial agent (silver / zinc loaded material) is slowly released from the core and maintains an effective antibacterial concentration in the sewage tank for up to 3-6 months. The two work together to achieve full-cycle hygiene control from clean water washing to sewage storage, and solve the problem of sewage tank odor.

[0033] (2) In this invention, by setting up a core scale inhibition and inorganic antibacterial zone, the scale inhibition powder (polyphosphate glass) in the core effectively inhibits the crystallization and precipitation of calcium and magnesium ions through lattice distortion and dispersion. The scale inhibition rate of the steam port can reach more than 95%, preventing nozzle blockage and protecting the steam port.

[0034] (3) In this invention, by using a compound system of "water-soluble binder + curing binder" and sintering at a specific temperature, the particles maintain structural integrity in water, have excellent water resistance, can be used stably for 3-6 months, match the maintenance cycle of the whole machine, have a stable structure, and a long service life.

[0035] (4) In this invention, by setting the pores of the adsorption material, the pores of the adsorption material not only serve as carriers for scale inhibition and antibacterial components, but can also selectively load fragrance microcapsules, releasing a pleasant fragrance while inhibiting bacteria, eliminating users' psychological resistance to sewage odor, and improving the product grade.

[0036] (5) By adopting segmented mixing and extrusion granulation processes, this invention ensures the enrichment of surface organic antibacterial agents and the formation of gradient structures. The process is stable and suitable for large-scale industrial production. Attached Figure Description

[0037] Figure 1 This is a cross-sectional structural diagram of antibacterial and scale-inhibiting microcrystalline particles for a clean water tank according to the present invention.

[0038] The diagram shows: 1. Surface organic antibacterial enrichment zone; 2. Core scale inhibition and inorganic antibacterial zone; 3. Pores of adsorbent material. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] like Figure 1 As shown, this embodiment proposes an antibacterial and scale-inhibiting microcrystalline particle for a clean water tank. From the outside inwards along the radial direction, it includes a surface organic antibacterial enrichment zone 1, a core scale-inhibiting and inorganic antibacterial zone 2, and adsorption material channels. The surface organic antibacterial enrichment zone 1 has a thickness of approximately 10% of the particle radius and is densely packed with organic antibacterial agents (shown as dots in the figure). The mass fraction of the organic antibacterial agent in this zone is 1.5–3 times higher than the average mass fraction of the particles. The particle interior is the core scale-inhibiting and inorganic antibacterial zone 2, which occupies 90% of the particle radius. This zone consists of a continuous framework formed by the adsorption material and scale-inhibiting powder embedded within it (Figure...). The structure consists of a square (■) and an inorganic antibacterial agent (▲) in the diagram. Within the core scale-inhibiting and inorganic antibacterial zone 2, multiple adsorbent material channels 3 are distributed, with a porosity of 15–35%. These channels are irregularly shaped and interconnected, forming a three-dimensional network structure. Some channels can be loaded with fragrance microcapsules (●) attached to the inner wall of the adsorbent material channels 3. When loaded, the fragrance microcapsules account for 0.5–5% of the total mass of the microcrystalline particles. The wall material of the fragrance microcapsules is melamine resin or gum arabic, and the core material is terpene or aldehyde fragrance. This structure ensures the rapid release of organic antibacterial agents and the slow release of scale-inhibiting / inorganic antibacterial agents, while simultaneously achieving stable loading of fragrance substances through the channel structure.

[0041] The microcrystalline particles, by total mass, are made of the following components in the following mass percentages: scale inhibitor powder 20–60%, inorganic antibacterial agent 5–25%, organic antibacterial agent 3–20%, adsorbent material 10–40%, and binder 10–30%.

[0042] The scale inhibitor powder is an inorganic scale inhibitor powder, which is made from raw materials containing sodium polyphosphate, sodium carbonate, calcium source and ammonium dihydrogen phosphate through four-stage sintering and hydrophobic treatment with surfactant. The sodium polyphosphate is a combination of sodium hexametaphosphate and sodium tripolyphosphate in a mass ratio of 1:1–3:1.

[0043] The inorganic antibacterial agent is a silver ion-supported material and / or a zinc-based antibacterial material. The silver ion-supported material is one or more of silver-supported zeolite, silver-supported zirconium phosphate, and silver-supported activated carbon, with the silver content accounting for 0.5–5% of the mass of the antibacterial agent. The zinc-based antibacterial material is tetraneedle-shaped zinc oxide whiskers and / or nano-zinc oxide.

[0044] The mass ratio of inorganic antibacterial agent to organic antibacterial agent is 1:0.5–1:4. The organic antibacterial agent is a quaternary ammonium salt and / or a pyridinethione. The quaternary ammonium salt in the organic antibacterial agent is selected from one or more of benzalkonium chloride, dicedyldimethylammonium chloride, and hexadecyltrimethylammonium bromide. The pyridinethione is zinc pyridinethione.

[0045] The adsorbent is one or more of carbon powder, diatomaceous earth, montmorillonite, silica, and alumina, with a mesh size of 200–1200 mesh. The water-soluble binder is selected from one or more of polyvinyl alcohol, starch, cellulose, and guar gum. The curing binder is selected from one or more of polyethylene, polypropylene, epoxy resin, and polyurethane.

[0046] The adhesive is composed of a water-soluble adhesive and a curing adhesive in a mass ratio of 0.5:1–200:1.

[0047] This invention also provides an application of antibacterial and scale-inhibiting microcrystalline particles in the clean water tank and wastewater tank of a sweeper or floor scrubber, including the following steps: placing the microcrystalline particles in the clean water tank, dissolving them in water, and then entering the wastewater tank during the washing process, so that the wastewater does not need to be poured out or become smelly for 3-6 months, and also inhibits scale and prevents clogging of the steam vent.

[0048] Example 1 (Base formula, with fragrance)

[0049] In this embodiment, the microcrystalline particle formulation (based on 100% total mass) is made from the following components in mass percentage:

[0050] Scale inhibitor powder: 40% (an inorganic scale inhibitor powder made of sodium hexametaphosphate: sodium tripolyphosphate = 2:1, which has been sintered in four stages and treated with a titanate coupling agent for hydrophobicity).

[0051] Inorganic antibacterial agent: 15% (silver-loaded zirconium phosphate and tetraneedle-shaped zinc oxide whiskers are mixed in a mass ratio of 1:1, with a silver content of 2.5%).

[0052] Organic antibacterial agent: 8% (benzalkonium chloride and zinc pyrithione are mixed at a mass ratio of 2:1);

[0053] Adsorbent material: 25% (1000 mesh carbon powder);

[0054] Adhesive: 12% (starch and polyethylene in a mass ratio of 1:3);

[0055] Fragrance microcapsules: 2.5% (wall material is melamine resin, core material is limonene fragrance).

[0056] The preparation method of the microcrystalline particles in this embodiment is as follows:

[0057] S1: Take the scale inhibitor powder, inorganic antibacterial agent, adsorbent material and binder according to the above ratio, dry mix them evenly, add deionized water accounting for 40% of the total solid mass, and stir to obtain the mixture.

[0058] S2: Premix 60% (4.8%) of the total amount of organic antibacterial agent with the above mixture; prepare a 20% aqueous solution of the remaining 40% (3.2%) of organic antibacterial agent with deionized water and spray it evenly on the surface of the material before extrusion granulation.

[0059] S3: Feed the material into the extruder and extrude it into wet granules with a diameter of about 2–3 mm.

[0060] S4: Sinter the wet particles at 180℃ for 1 hour, then cool to obtain microcrystalline particle semi-finished product.

[0061] S5: Prepare the fragrance microcapsules into an ethanol dispersion, spray them onto the surface of the semi-finished particles, and dry them at a low temperature of 40°C to obtain the finished product.

[0062] Example 2 (High hard water area, enhanced scale inhibition)

[0063] The difference from the above embodiments is that the formula was adjusted in this embodiment: the scale inhibitor powder was increased to 50%, the inorganic antibacterial agent to 20%, the organic antibacterial agent to 5%, the adsorbent material (diatomaceous earth, 500 mesh) to 18%, and the binder to 7%. The preparation method was the same as in Example 1, and the sintering temperature was 200℃.

[0064] Example 3 (Fragrance-free, low-cost version)

[0065] The difference from the above embodiments is that in this embodiment, the formula is the same as in Embodiment 1, but fragrance microcapsules are not added, step S5 is omitted, and the process proceeds directly to the cooling and packaging process.

[0066] Comparative Example 1 (no surface organic antibacterial agent, only the core)

[0067] The difference from the above embodiments is that in this comparative example, the formulation is the same as in Example 1, but the organic antibacterial agent is 100% involved in the premixing, and there is no surface spraying step.

[0068] Comparative Example 2 (Nuclear-free inorganic antibacterial agent, organic-only)

[0069] The difference from the above embodiments is that in this comparative example, the formulation is the same as in Example 1, but no inorganic antibacterial agent (silver-loaded zirconium phosphate / zinc oxide) is added, and the position of the inorganic antibacterial agent is replaced by an equal amount of adsorbent material (carbon powder).

[0070] Comparative Example 3 (A scale inhibitor particle disclosed in prior art CN111233176A)

[0071] Pure scale inhibitor particles were prepared using the formulation and method of Example 14 in CN111233176A, without any antibacterial agents.

[0072] Performance testing and results analysis:

[0073] The particles from Examples 1-3 and Comparative Examples 1-3 were placed in the clean water tank of a simulated sweeper and tested using 300 ppm hard water. The test results are shown in the table below:

[0074] Table 1: Performance Test Results of Microcrystalline Particles

[0075] Test Project Test conditions / standards Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 scale inhibition rate GB / T 16632-2008, 300ppm hard water, 80℃ 97.8% 98.5% 97.5% 97.6% 97.8% 98.0% Rapid antibacterial effect upon immersion in water (30 minutes) GB / T 21510-2008, Escherichia coli >99.9% >99.9% >99.9% 82.4% >99.9% <50% Long-lasting antibacterial effect (90-day wastewater tank) After the entire machine has been run, it is sealed and allowed to stand. CFU / mL <10 <10 <10 <![CDATA[>10 6 ]]> <![CDATA[>10 5 ]]> <![CDATA[>10 7 ]]> Wastewater tank odor prevention rating After standing for 180 days, the grades range from Grade 1 (odorless) to Grade 5 (malodorous). Level 1 Level 1 Level 1 Level 4 Level 3 Level 5 Fragrance slow-release (30-day residue rate) Headspace GC-MS analysis 85% 88% 0% / / / Particle integrity (soaked for 30 days) Visual observation whole whole whole whole Slight powdering whole

[0076] Results analysis:

[0077] Scale inhibition performance: The scale inhibition rate of all samples containing scale inhibition powder was higher than 96%, proving that the core scale inhibition function of the present invention was maintained.

[0078] Antibacterial performance: Examples 1-3 demonstrated excellent combination of rapid and long-lasting antibacterial effects. Comparative Example 1, lacking a surface organic antibacterial enrichment zone, exhibited extremely low antibacterial rate in the initial stage of water introduction, demonstrating the necessity of surface gradient design; Comparative Example 2, lacking a core inorganic antibacterial agent, showed severe exceedances in the wastewater tank after 90 days, proving that long-lasting antibacterial effect depends on the slow release of inorganic antibacterial agents.

[0079] Odor prevention effect: Examples 1-3 all maintained Level 1 odorlessness during the 180-day test period, while Comparative Examples 1-3 all showed varying degrees of foul odor, verifying the effectiveness of "dual-effect relay antibacterial" in solving the odor problem of sewage tanks.

[0080] Fragrance Function: Examples 1-2 successfully achieved the loading and sustained release of fragrance microcapsules, enhancing the user experience.

[0081] In summary, this invention, through its unique gradient structure design, successfully solves the hygiene control problem of the clean water tank and wastewater tank of sweeping / scrubbers, while also taking into account both scale prevention at the steam vent and improved user experience, demonstrating significant technological advancement and application value.

[0082] All content not described in detail in this specification is prior art known to those skilled in the art, and the accompanying drawings are structural schematic diagrams used to supplement the text of the specification.

[0083] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A clear water tank antibacterial and scale inhibiting microcrystalline particle, characterized in that, Based on the total mass of microcrystalline particles (100%), it is made of the following components in the following mass percentages: scale inhibitor powder 20–60%, inorganic antibacterial agent 5–25%, organic antibacterial agent 3–20%, adsorbent material 10–40%, and binder 10–30%. The adhesive is composed of a water-soluble adhesive and a curing adhesive in a mass ratio of 0.5:1–200:1; The organic antibacterial agent is a quaternary ammonium salt and / or a pyridinethione; The microcrystalline particles, arranged radially from the outside in, include: Surface organic antibacterial enrichment zone (1), the surface organic antibacterial enrichment zone (1) accounts for 10% of the particle radius, and the mass fraction of the organic antibacterial agent in this zone is 1.5–3 times higher than the average mass fraction of the particles; Core scale inhibition and inorganic antibacterial zone (2), the core scale inhibition and inorganic antibacterial zone (2) accounts for 90% of the particle radius, and the adsorbent material and binder are sintered to form a solid skeleton as a continuous phase, in which scale inhibition powder and inorganic antibacterial agent are dispersed; The adsorbent material pores (3) are three-dimensional interconnected irregular pores that penetrate the core scale inhibition and inorganic antibacterial zone (2), with a porosity of 15–35%.

2. The clear water tank antibacterial and scale inhibiting microcrystalline particles according to claim 1, characterized in that: The pores (3) of the adsorbent material can be loaded with fragrance microcapsules. The fragrance microcapsules are attached to the inner wall of the pores (3) of the adsorbent material. When loaded, the fragrance microcapsules account for 0.5-5% of the total mass of the microcrystalline particles. The wall material of the fragrance microcapsules is melamine resin or gum arabic, and the core material of the fragrance microcapsules is terpene or aldehyde fragrance.

3. The clear water tank antibacterial and scale inhibiting microcrystalline particles according to claim 1, characterized in that: The scale inhibitor powder is an inorganic scale inhibitor powder, which is prepared by sintering raw materials containing sodium polyphosphate, sodium carbonate, calcium source and ammonium dihydrogen phosphate in four stages and then treating them with a surfactant for hydrophobicity. The sodium polyphosphate is a combination of sodium hexametaphosphate and sodium tripolyphosphate in a mass ratio of 1:1–3:

1.

4. The antibacterial and scale-inhibiting microcrystalline particles for clear water tanks according to claim 1, characterized in that: The inorganic antibacterial agent is a silver ion-supported material and / or a zinc-based antibacterial material. The silver ion-supported material is one or more of silver-supported zeolite, silver-supported zirconium phosphate, and silver-supported activated carbon, with a silver content of 0.5–5% of the antibacterial agent mass. The zinc-based antibacterial material is tetraneedle-shaped zinc oxide whiskers and / or nano-zinc oxide.

5. The antibacterial and scale-inhibiting microcrystalline particles for clear water tanks according to claim 1, characterized in that: The mass ratio of the inorganic antibacterial agent to the organic antibacterial agent is 1:0.5–1:

4. The quaternary ammonium salt in the organic antibacterial agent is selected from one or more of benzalkonium chloride, dicedyldimethylammonium chloride, and hexadecyltrimethylammonium bromide. The pyridinethione is zinc pyridinethione.

6. The antibacterial and scale-inhibiting microcrystalline particles for clear water tanks according to claim 1, characterized in that: The adsorbent material is one or more of carbon powder, diatomaceous earth, montmorillonite, silica, and alumina, with a mesh size of 200–1200 mesh. The water-soluble binder is selected from one or more of polyvinyl alcohol, starch, cellulose, and guar gum. The curing binder is selected from one or more of polyethylene, polypropylene, epoxy resin, and polyurethane.

7. A method for preparing antibacterial and scale-inhibiting microcrystalline particles for a clean water tank, characterized in that, Includes the following steps: S1. Take scale inhibitor powder, inorganic antibacterial agent, adsorbent material and binder according to the ratio, mix them, add deionized water and stir to obtain a mixture. The mass of deionized water is 20-60% of the total mass of solids. S2. Premix 50-70% of the total amount of organic antibacterial agent with the mixture from step S1, and prepare the remaining 30-50% of the organic antibacterial agent into an aqueous solution, which is then sprayed onto the surface of the material before extrusion granulation. S3. Extrude the material obtained in step S2 into granules with a particle size of 1–4 mm. S4. Sinter the particles at 110–280℃ for 0.5–2h, then cool to obtain microcrystalline particles.

8. The preparation method according to claim 7, characterized in that, It also includes step S5: loading the fragrance microcapsules into the pores of the adsorption material of the particles obtained in step S4 by impregnation adsorption or spray coating, and drying at low temperature.

9. The preparation method according to claim 7, characterized in that: The sintering temperature in step S4 is 150–200℃.

10. The application of the antibacterial and scale-inhibiting microcrystalline particles of any one of claims 1-6 in the clean water tank and wastewater tank of a sweeper or floor scrubber, characterized in that, The process includes the following steps: placing the microcrystalline particles in a clean water tank, dissolving them in water, and then entering the wastewater tank during the washing process, so that the wastewater does not need to be dumped or become smelly for 3-6 months, and also prevents scale buildup and clogging at the steam vent.

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