Antibacterial and deodorant particles and preparation method thereof

Abstract

The invention relates to an antibacterial and deodorant particle which comprises an active particle and a hydrophilic film wrapping the outer surface of the active particle. The active particles comprise the following raw material components in parts by weight: 15-20 parts of SEBS, 8-15 parts of silicon dioxide, 10-20 parts of sepiolite powder, 6-16 parts of an antibacterial agent, 2-5 parts of sodium stearate, 2-5 parts of sodium citrate, 5-10 parts of beta-cyclodextrin, 18-27 parts of an adhesive and 1-3 parts of an odor neutralizer; the hydrophilic film is formed by forming a hydrophilic material. According to the antibacterial and deodorant particles, SEBS serves as a hydrophobic elastic framework of active particles, and free diffusion of active ingredients in the particles is limited through hydrophobic entanglement of molecular chains; meanwhile, a hydrophilic material is used as an outer coating film, and the release rate of the active components is controlled by adjusting the interface action of the active particles and sewage, so that the antibacterial and adsorption deodorization active components in the antibacterial and deodorization particles are stably and slowly released; it is ensured that the efficient and long-acting antibacterial and deodorizing effect can be achieved for 14 days in complex water environments such as domestic sewage treatment.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, and particularly relates to an antibacterial deodorization particle and a preparation method thereof. BACKGROUND

[0002] With the increase of organic pollutants (such as dairy residues, kitchen waste) in domestic sewage, the demand for antibacterial deodorization materials in special application scenarios such as domestic sewage treatment is growing. However, the existing antibacterial deodorization materials on the market often have the following problems:

[0003] (1) Insufficient long-acting: chemical deodorization materials are often quickly consumed during use and are prone to failure; while biological antibacterial materials are prone to inactivation and decomposition due to unstable structure, temperature, pH value and microbial metabolism, and cannot maintain long-term antibacterial effect;

[0004] (2) Poor stability: most antibacterial deodorization materials are difficult to adapt to complex water environments, for example, in a system where sewage and milk are mixed, due to high COD value, rich nutrients and microbial activity, the material is prone to degradation, thereby facing the risk of failure.

[0005] Therefore, developing a material that can exist stably in a complex water environment for a long time and has efficient antibacterial and deodorization functions has become the focus of current research. SUMMARY

[0006] In order to solve the above technical problems, the present application provides an antibacterial deodorization particle and a preparation method thereof.

[0007] The technical scheme adopted by the present application is:

[0008] The present application provides an antibacterial deodorization particle, which comprises an active particle and a hydrophilic film wrapped on the outer surface of the active particle.

[0009] The raw material components of the active particle include, by weight: SEBS 15-20 parts, silicon dioxide 8-15 parts, sepiolite powder 10-20 parts, antibacterial agent 6-16 parts, sodium stearate 2-5 parts, sodium citrate 2-5 parts, beta-cyclodextrin 5-10 parts, adhesive 18-27 parts, and odor neutralizer 1-3 parts.

[0010] The hydrophilic film is formed by a hydrophilic material.

[0011] The antibacterial and deodorizing granule provided by the application is prepared by using SEBS as the hydrophobic elastic framework of the active granule, which limits the free diffusion of the active ingredients in the granule through the hydrophobic entanglement of the molecular chain; meanwhile, the hydrophilic material is used as the outer coating film, which controls the release rate of the active ingredients by adjusting the interface interaction between the active granule and sewage, so that the active ingredients in the antibacterial and deodorizing granule are stably and slowly released, and the antibacterial and deodorizing effect can be achieved for 14 days in the complex water environment such as domestic sewage treatment.

[0012] Preferably, the hydrophilic material is selected from a polyvinyl alcohol solution, the solid content of the polyvinyl alcohol solution is 15-25%, and the amount is 3-8 parts by weight.

[0013] Preferably, the molecular weight of the SEBS is 80000-120000.

[0014] Preferably, the melting point of the sodium stearate is 62-65℃.

[0015] Preferably, the adhesive is obtained by compounding water-based polyurethane emulsion and epoxy emulsion at a weight ratio of 0.5-1.2:1;

[0016] The solid content of the water-based polyurethane emulsion is 45-55%, and the molecular weight is 8000-12000;

[0017] The solid content of the epoxy emulsion is 45-55%, and the epoxy value is 0.80-0.90.

[0018] Preferably, the particle size of the silicon dioxide is 50-100nm, and the specific surface area is 100-200m 2 / g;

[0019] The particle size of the sepiolite powder is 0.5-2μm, and the pore size is 2-50nm;

[0020] The antibacterial agent is selected from isothiazolinone compounds;

[0021] The odor neutralizer is selected from natural plant extracts.

[0022] Another aspect of the application provides a preparation method of the antibacterial and deodorizing granule according to any one of the above technical solutions, which comprises the following steps:

[0023] S1, blending SEBS, adhesive and odor neutralizer, and then adding sepiolite powder, β-cyclodextrin, antibacterial agent, silicon dioxide, sodium stearate and sodium citrate for granulation to obtain active granule;

[0024] S2, diluting the hydrophilic material with water to prepare a film solution, and then spraying the film solution to coat the surface of the active granule to form a hydrophilic film, and then vacuum drying to obtain the antibacterial and deodorizing granule.

[0025] Preferably, in step S1, a pretreatment is further included before the granulation, the pretreatment includes activating the sepiolite powder and the β-cyclodextrin at 120-130℃ for 1-3h, and loading the antibacterial agent on the silica by impregnation method.

[0026] Preferably, in step S1, the temperature of the blending is 50-60℃.

[0027] Preferably, in step S2, the concentration of the film-forming solution is 4-6wt%;

[0028] The temperature of the vacuum drying is 50-60℃. DETAILED DESCRIPTION

[0029] In order to better understand the above technical solutions, the exemplary embodiments of the present application will be described in more detail below. Although the exemplary embodiments of the present application are shown, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more clearly, thoroughly understood, and the scope of the present application can be completely conveyed to those skilled in the art.

[0030] In one aspect, the present application provides an antibacterial and deodorizing particle, comprising an active particle and a hydrophilic film wrapped on the outer surface of the active particle.

[0031] The raw material components of the active particle include, by weight parts: SEBS 15-20 parts, silica 8-15 parts, sepiolite powder 10-20 parts, antibacterial agent 6-16 parts, sodium stearate 2-5 parts, sodium citrate 2-5 parts, β-cyclodextrin 5-10 parts, adhesive 18-27 parts, odor neutralizer 1-3 parts.

[0032] The hydrophilic film is formed by a hydrophilic material.

[0033] The "hydrophobic skeleton-hydrophilic film" sustained-release system constructed by the present application realizes the precise control release of the active ingredients in the antibacterial and deodorizing particles through the synergistic effect of physical barrier and interface regulation. When the antibacterial and deodorizing particles contact with sewage, the outer hydrophilic film swells first to form a controllable release channel; at the same time, the inner SEBS hydrophobic skeleton restricts the free diffusion of the active ingredients wrapped therein by virtue of the three-dimensional network structure formed by the hydrophobic entanglement between molecular chains, thereby delaying the release rate. If only the hydrophilic film or SEBS is used, it cannot completely block the rapid release of the active ingredients. In addition, sodium stearate as a lubricant and interface regulator can dynamically regulate the balance of hydrophilicity / hydrophobicity of the interface between the hydrophobic skeleton and the hydrophilic film, and adjust the release rate; the adhesive can enhance the overall structural stability of the antibacterial and deodorizing particles to prevent disintegration from affecting the sustained-release effect. The sustained-release system of the present application enables the antibacterial and deodorizing particles to achieve stable release for 14 days in complex water environment, providing protection for the continuous and efficient exertion of antibacterial and deodorizing functions. The specific antibacterial and deodorizing principle is as follows: (1) Antibacterial aspect: taking antibacterial agent as the core, supplemented by silicon dioxide to effectively load and uniformly disperse the antibacterial agent, sodium citrate to maintain the system pH = 6.5-7.5 to ensure the stability of the activity of the antibacterial agent, and sepiolite powder to assist in loading the antibacterial agent, thereby realizing efficient inhibition and killing of bacteria and other microorganisms. (2) Deodorizing aspect: sepiolite powder uses its porous characteristics to efficiently adsorb small-molecule organic substances (such as fatty acids, etc.), β-cyclodextrin uses its cavity structure to include odor molecules (such as sulfur-containing and nitrogen-containing compounds, etc.), and odor neutralizing agent performs neutralization or decomposition on the adsorbed / included odor substances through chemical reaction, thereby realizing "capture-fixation-degradation" of complex odor substances and avoiding odor residue or rebound.

[0034] In a preferred embodiment, the hydrophilic material is selected from a polyvinyl alcohol solution, the solid content of the polyvinyl alcohol solution is 15-25%, and the amount is 3-8 parts by weight. In the present application, the solid content and amount of the polyvinyl alcohol (PVA) solution regulate the sustained-release effect by affecting the film-forming properties. When the PVA solid content is <15% or the weight parts are <3 parts, the film layer is too thin and loose, resulting in too fast swelling of the antibacterial and deodorizing particles when they contact with sewage, initial burst release of the active ingredients, and inability to achieve long-acting sustained release; when the PVA solid content is 15-25% and the weight parts are 3-8 parts, the film thickness is moderate and the compactness is balanced, the swelling rate is moderate, a controllable release channel can be established, and the active ingredients can be released smoothly in the sewage; when the PVA solid content is >25% or the weight parts are >8 parts, the film layer is too thick and too dense, resulting in too slow swelling, hindering the formation of the release channel, and insufficient release of the active ingredients. For example, the solid content of the polyvinyl alcohol solution can be any of 15%, 17%, 19%, 20%, 23%, 25%, etc.; the weight parts can be any of 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, etc., all without particular limitation.

[0035] In a preferred embodiment, the SEBS has a molecular weight of 80000-120000. In the present application, the SEBS serves as the skeleton of the active particles, guaranteeing its hydrophobicity and mechanical strength. The molecular weight in this range ensures that the SEBS forms a stable three-dimensional entangled network, neither too sparse nor too dense. If the molecular weight is too low (<80000), the entangled network will be sparse and loose, and thus unable to effectively limit the diffusion of the active ingredient. If the molecular weight is too high (>120000), the entangled network will be too dense, making it difficult for the active ingredient to be released. For example, the SEBS can have a molecular weight of any one of 80000, 90000, 100000, 110000, 120000, etc. The molecular weight of the SEBS in the embodiments of the present application refers to the weight average molecular weight.

[0036] In a preferred embodiment, the sodium stearate has a melting point of 62-65°C. In the present application, this melting point range is selected to match the blending processing temperature, so that the sodium stearate is in a partially softened state during processing, promoting the uniform dispersion of each raw material component through lubrication, while maintaining good structural stability, which can guarantee the sustained regulation of the hydrophobicity-hydrophilicity balance of the SEBS hydrophobic skeleton-hydrophilic membrane interface during subsequent particle use. The melting point of the sodium stearate can be 62°C, 63°C, 64°C, 65°C, etc., without particular limitation.

[0037] In a preferred embodiment, the binder is obtained by compounding water-based polyurethane emulsion and epoxy emulsion at a weight ratio of 0.5-1.2:1;

[0038] The water-based polyurethane emulsion has a solid content of 45-55% and a molecular weight of 8000-12000;

[0039] The epoxy emulsion has a solid content of 45-55% and an epoxy value of 0.80-0.90.

[0040] In the present application, the waterborne polyurethane emulsion and the epoxy emulsion are selected to be compounded as the adhesive, the former provides flexibility, and the latter provides rigidity, the functions of the two are complementary, the firm bonding of each component is realized, and the stability of the antibacterial and deodorizing particles is improved. If only the waterborne polyurethane emulsion is used, the particles are easy to crack due to excessive swelling in water; if only the epoxy emulsion is used, the particles are easy to scatter due to high brittleness. For example, the weight ratio of the waterborne polyurethane emulsion and the epoxy emulsion can be 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1, etc., wherein the waterborne polyurethane emulsion can be 45% solid content, 12000 molecular weight, 48% solid content, 11000 molecular weight, 50% solid content, 10000 molecular weight, 52% solid content, 9000 molecular weight, 55% solid content, 8000 molecular weight, etc., the molecular weight of the waterborne polyurethane emulsion in the present application refers to the number average molecular weight; the epoxy emulsion can be 45% solid content, 0.90 epoxy value, 48% solid content, 0.88 epoxy value, 50% solid content, 0.85 epoxy value, 53% solid content, 0.82 epoxy value, 55% solid content, 0.80 epoxy value, etc., all without special limitation.

[0041] In a preferred embodiment, the particle size of the silicon dioxide is 50-100 nm, and the specific surface area is 100-200 m 2 / g;

[0042] The particle size of the sepiolite powder is 0.5-2 μm, and the pore size is 2-50 nm;

[0043] The antibacterial agent is selected from isothiazolinone compounds;

[0044] The odor neutralizing agent is selected from natural plant extracts.

[0045] In the present application, the silicon dioxide with the above particle size and specific surface area is selected, which is beneficial to efficient loading of the antibacterial agent and improves the dispersibility of the antibacterial agent. For example, the particle size of the silicon dioxide can be any value in 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, 100 nm, etc., and the specific surface area thereof can be 100 m 2 / g, 120 m 2 / g, 150 m 2 / g, 180 m 2 / g, 200 m 2any one of 0.5 μm, 0.8 μm, 1 μm, 1.2 μm, 1.5 μm, 1.7 μm, 2 μm, etc., and the pore size can be any one of 2 nm, 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, etc.; the isothiazolinone compound is selected as the antibacterial agent, and a better antibacterial effect can be achieved, for example, it can be one or a combination of two or more of benzisothiazolin-3-one (BIT), 1,2-benzisothiazolin-3-one (BBIT), 2-methyl-4-isothiazolin-3-one (MIT), 5-chloro-2-methyl-4-isothiazolin-3-one (CMIT), etc.; the natural plant extract is selected as the odor neutralizing agent, and a better deodorizing effect can be achieved, for example, it can be any one of a chamomile extract, a sophora extract, a verbena extract, etc., all without particular limitation.

[0046] In another aspect, the application provides a preparation method of the antibacterial and deodorizing particles according to any one of the above technical solutions, comprising the following steps:

[0047] S1, blending SEBS, an adhesive, and an odor neutralizing agent, and then adding meerschaum powder, β-cyclodextrin, an antibacterial agent, silicon dioxide, sodium stearate, and sodium citrate for granulation to obtain active particles;

[0048] S2, diluting the hydrophilic material with water to prepare a film solution, and then spraying the film solution to coat the surface of the active particles to form a hydrophilic film, and vacuum drying to obtain the antibacterial and deodorizing particles.

[0049] The preparation process of the antibacterial and deodorizing particles is simple, easy to operate, and suitable for large-scale industrial production.

[0050] In a preferred embodiment, the step S1 further comprises pretreatment before granulation, and the pretreatment comprises activating the meerschaum powder and the β-cyclodextrin at 120-130°C for 1-3h, and loading the antibacterial agent on the silicon dioxide by the impregnation method. In the application, the meerschaum powder and the β-cyclodextrin are activated in advance, which can enhance the adsorption performance of the meerschaum powder, optimize the inclusion ability of the β-cyclodextrin, and thus improve the adsorption and deodorizing effect of the antibacterial and deodorizing particles, for example, the activation treatment can be 120°C×3h, 125°C×2h, 130°C×1h, etc. The antibacterial agent is loaded in advance, which can improve the dispersion uniformity of the antibacterial agent, and thus improve the antibacterial effect of the antibacterial and deodorizing particles, for example, the impregnation method can be to immerse the silicon dioxide in an antibacterial agent ethanol solution and stir to disperse, so that the antibacterial agent is uniformly attached to the surface and pores of the silicon dioxide.

[0051] In a preferred embodiment, in step S1, the temperature of the blending is 50-60℃. In the present application, under the blending temperature range, the viscosity of the adhesive is reduced, the uniform dispersion of SEBS and odor neutralizer is promoted by shearing, the efficient and uniform mixing with the remaining raw material components is ensured, and a stable slow-release network structure is constructed. For example, the temperature of the blending can be 50℃, 52℃, 55℃, 57℃, 60℃, etc.

[0052] In a preferred embodiment, in step S2, the concentration of the film-forming solution is 4-6wt%;

[0053] The temperature of the vacuum drying is 50-60℃.

[0054] In the present application, the film-forming solution with the above-mentioned concentration is selected, which has suitable fluidity, can form a continuous defect-free film layer, and improves the uniformity of the release of active ingredients. For example, its concentration can be 4wt%, 4.5wt%, 5wt%, 5.5wt%, 6wt%, etc. In addition, vacuum drying can avoid the influence of moisture on the integrity of the hydrophilic film structure and avoid the premature release of active ingredients. For example, the temperature of the vacuum drying can be 50℃, 53℃, 55℃, 58℃, 60℃, etc.

[0055] Example 1

[0056] An antibacterial and deodorizing particle, comprising an active particle and a hydrophilic film wrapped on the outer surface of the active particle;

[0057] The raw material components of the active particle include, by weight: SEBS 15 parts, silicon dioxide 12 parts, sepiolite powder 15 parts, antibacterial agent 10 parts (BIT 5 parts, BBIT 5 parts), sodium stearate 3 parts, sodium citrate 3 parts, β-cyclodextrin 8 parts, adhesive 20 parts (aqueous polyurethane emulsion 8 parts, epoxy emulsion 12 parts), odor neutralizer 1 part (chamomile extract);

[0058] The hydrophilic film is formed by a hydrophilic material, and the hydrophilic material is selected from a polyvinyl alcohol solution with a solid content of 20% and a dosage of 5 parts by weight.

[0059] In the above-mentioned raw material components of the active particle, the molecular weight of SEBS is 100000;

[0060] The particle size of silicon dioxide is 80nm, and the specific surface area is 150m 2 / g;

[0061] The particle size of sepiolite powder is 1μm, and the pore size is 10nm;

[0062] The melting point of sodium stearate is 63℃;

[0063] The solid content of the water-based polyurethane emulsion in the adhesive is 50%, the molecular weight is 10000, and the solid content of the epoxy emulsion is 50%, and the epoxy value is 0.85.

[0064] The preparation method of the antibacterial and deodorizing particles comprises the following steps:

[0065] S1, pretreating the sepiolite powder, β-cyclodextrin, antibacterial agent and silicon dioxide, including activating the sepiolite powder and β-cyclodextrin at 120°C for 2h to obtain activated sepiolite powder and activated β-cyclodextrin, and stirring and dispersing the silicon dioxide in an antibacterial agent ethanol solution to obtain silicon dioxide loaded with the antibacterial agent;

[0066] Blending SEBS, adhesive and odor neutralizer at 50°C, then adding activated sepiolite powder, activated β-cyclodextrin, silicon dioxide loaded with antibacterial agent, sodium stearate and sodium citrate for granulation to obtain active particles;

[0067] S2, diluting the hydrophilic material with water to prepare a film-forming solution with a concentration of 5wt%, then spraying to wrap the surface of the active particles to form a hydrophilic film, vacuum drying at 50°C until the water content is ≤1% to obtain antibacterial and deodorizing particles with a particle size of 6mm and a density of 1.2g / cm 3 .

[0068] Example 2

[0069] An antibacterial and deodorizing particle comprises active particles and a hydrophilic film wrapped on the outer surface of the active particles.

[0070] The raw material components of the active particles include, by weight: SEBS 18 parts, silicon dioxide 10 parts, sepiolite powder 12 parts, antibacterial agent 12 parts (BIT 6 parts, BBIT 6 parts), sodium stearate 4 parts, sodium citrate 4 parts, β-cyclodextrin 6 parts, adhesive 23 parts (water-based polyurethane emulsion 10 parts, epoxy emulsion 13 parts), odor neutralizer 3 parts (Sophora extract).

[0071] The hydrophilic film is formed by a hydrophilic material, and the hydrophilic material is selected from a polyvinyl alcohol solution, the solid content of the polyvinyl alcohol solution is 25%, and the amount is 3 parts by weight.

[0072] In the raw material components of the active particles, the molecular weight of SEBS is 110000.

[0073] The particle size of the silicon dioxide is 70nm, and the specific surface area is 180m 2 / g.

[0074] The particle size of the sepiolite powder is 1.5μm, and the pore size is 20nm.

[0075] The melting point of sodium stearate is 64°C.

[0076] The solid content of the water-based polyurethane emulsion in the adhesive is 48%, and the molecular weight is 12000. The solid content of the epoxy emulsion is 53%, and the epoxy value is 0.88.

[0077] The preparation method of the antibacterial and deodorizing granules comprises the following steps:

[0078] S1, pretreating the sepiolite powder, β-cyclodextrin, antibacterial agent and silicon dioxide, including activating the sepiolite powder and β-cyclodextrin at 125°C for 2h to obtain activated sepiolite powder and activated β-cyclodextrin, and stirring and dispersing the silicon dioxide in an antibacterial agent ethanol solution to obtain silicon dioxide loaded with the antibacterial agent;

[0079] Blending SEBS, adhesive and odor neutralizer at 55°C, and then adding the activated sepiolite powder, activated β-cyclodextrin, silicon dioxide loaded with the antibacterial agent, sodium stearate and sodium citrate for granulation to obtain active granules;

[0080] S2, diluting the hydrophilic material with water to prepare a film-forming solution with a concentration of 5wt%, and then spraying the film-forming solution to wrap the surface of the active granules to form a hydrophilic film, and vacuum drying at 55°C until the water content is ≤1% to obtain antibacterial and deodorizing granules with a particle size of 5mm and a density of 1.0g / cm 3 .

[0081] Example 3

[0082] An antibacterial and deodorizing granule comprises active granules and a hydrophilic film wrapped on the outer surface of the active granules.

[0083] The raw material components of the active granules include, by weight, SEBS 20 parts, silicon dioxide 10 parts, sepiolite powder 10 parts, antibacterial agent 8 parts (BIT 4 parts, BBIT 4 parts), sodium stearate 2 parts, sodium citrate 2 parts, β-cyclodextrin 10 parts, adhesive 22 parts (water-based polyurethane emulsion 12 parts, epoxy emulsion 10 parts), odor neutralizer 2 parts (Verbena extract);

[0084] The hydrophilic film is formed by a hydrophilic material, and the hydrophilic material is selected from a polyvinyl alcohol solution, the solid content of the polyvinyl alcohol solution is 15%, and the amount is 8 parts by weight.

[0085] In the raw material components of the active granules, the molecular weight of SEBS is 90000;

[0086] The particle size of the silicon dioxide is 60nm, and the specific surface area is 120m 2 / g;

[0087] The particle size of the sepiolite powder is 1μm, and the pore size is 30nm;

[0088] The melting point of sodium stearate is 62°C;

[0089] The solid content of the water-based polyurethane emulsion in the adhesive is 52%, the molecular weight is 9000, and the solid content of the epoxy emulsion is 48%, and the epoxy value is 0.82.

[0090] The preparation method of the antibacterial and deodorizing granules comprises the following steps:

[0091] S1, pretreating the sepiolite powder, beta-cyclodextrin, antibacterial agent and silicon dioxide, including activating the sepiolite powder and beta-cyclodextrin at 130°C for 2h to obtain activated sepiolite powder and activated beta-cyclodextrin, and stirring and dispersing the silicon dioxide in an antibacterial agent ethanol solution to obtain silicon dioxide loaded with the antibacterial agent;

[0092] Blending SEBS, adhesive and odor neutralizer at 60°C, then adding activated sepiolite powder, activated beta-cyclodextrin, silicon dioxide loaded with antibacterial agent, sodium stearate and sodium citrate for granulation to obtain active granules;

[0093] S2, diluting the hydrophilic material with water to prepare a film-forming solution with a concentration of 5wt%, then spraying to wrap the surface of the active granules to form a hydrophilic film, and vacuum drying at 60°C until the water content is ≤1% to obtain antibacterial and deodorizing granules with a particle size of 7mm and a density of 1.2g / cm 3 .

[0094] Example 4

[0095] The difference between this embodiment and Example 1 is that the amount and performance parameters of the components are different. The remaining steps remain unchanged.

[0096] An antibacterial and deodorizing granule comprises active granules and a hydrophilic film wrapped on the outer surface of the active granules.

[0097] The raw material components of the active granules include, by weight: SEBS 17 parts, silicon dioxide 14 parts, sepiolite powder 14 parts, antibacterial agent 14 parts (BIT 7 parts, BBIT 7 parts), sodium stearate 5 parts, sodium citrate 2 parts, beta-cyclodextrin 5 parts, adhesive 19 parts (water-based polyurethane emulsion 9 parts, epoxy emulsion 10 parts), odor neutralizer 2 parts (viagra tea extract);

[0098] The hydrophilic film is formed by a hydrophilic material, and the hydrophilic material is selected from a polyvinyl alcohol solution, and the solid content of the polyvinyl alcohol solution is 23%, and the amount is 6 parts by weight.

[0099] In the raw material components of the active granules, the molecular weight of SEBS is 85000;

[0100] The particle size of the silicon dioxide is 90nm, and the specific surface area is 170m 2 / g;

[0101] The particle size of the sepiolite powder is 0.8 μm, and the pore size is 16 nm;

[0102] The melting point of the sodium stearate is 63 °C;

[0103] In the binder, the solid content of the waterborne polyurethane emulsion is 46%, and the molecular weight is 11500. The solid content of the epoxy emulsion is 52%, and the epoxy value is 0.83.

[0104] The preparation method of the antibacterial and deodorizing granules is the same as that in Example 1. The particle size of the prepared antibacterial and deodorizing granules is 6 mm, and the density is 1.1 g / cm 3 .

[0105] Example 5

[0106] The difference between this example and Example 1 is that the use amount and performance parameters of the components are different. The remaining steps remain unchanged.

[0107] An antibacterial and deodorizing granule comprises active granules and a hydrophilic film wrapped on the outer surface of the active granules;

[0108] The raw material components of the active granules comprise, by weight fraction: SEBS 19 parts, silicon dioxide 8 parts, sepiolite powder 20 parts, antibacterial agent 8 parts (BIT 3 parts, BBIT 5 parts), sodium stearate 2 parts, sodium citrate 5 parts, β-cyclodextrin 7 parts, binder 24 parts (waterborne polyurethane emulsion 11 parts, epoxy emulsion 13 parts), odor neutralizer 3 parts (Sophora extract);

[0109] The hydrophilic film is formed by a hydrophilic material, and the hydrophilic material is selected from a polyvinyl alcohol solution. The solid content of the polyvinyl alcohol solution is 22%, and the amount is 4 parts by weight.

[0110] In the above raw material components of the active granules, the molecular weight of SEBS is 115000;

[0111] The particle size of the silicon dioxide is 100 nm, and the specific surface area is 160 m 2 / g;

[0112] The particle size of the sepiolite powder is 1.8 μm, and the pore size is 30 nm;

[0113] The melting point of the sodium stearate is 63 °C;

[0114] In the binder, the solid content of the waterborne polyurethane emulsion is 53%, and the molecular weight is 8500. The solid content of the epoxy emulsion is 47%, and the epoxy value is 0.87.

[0115] The preparation method of the antibacterial and deodorizing granules is the same as that in Example 1. The particle size of the prepared antibacterial and deodorizing granules is 5 mm, and the density is 1.0 g / cm 3 .

[0116] Comparative Example 1

[0117] The difference between this comparative example and Example 1 is that the hydrophilic film is not included. The remaining steps remain unchanged.

[0118] Comparative Example 2

[0119] The difference between this comparative example and Example 1 is that the SEBS is not added in the raw material components of the active particles. The remaining steps remain unchanged.

[0120] Comparative Example 3

[0121] The difference between this comparative example and Example 1 is that the molecular weight of SEBS is adjusted from 100000 to 150000. The remaining steps remain unchanged.

[0122] Comparative Example 4

[0123] The difference between this comparative example and Example 1 is that the molecular weight of SEBS is adjusted from 100000 to 50000. The remaining steps remain unchanged.

[0124] Comparative Example 5

[0125] The difference between this comparative example and Example 1 is that the sodium stearate is not added in the raw material components of the active particles. The remaining steps remain unchanged.

[0126] Comparative Example 6

[0127] The difference between this comparative example and Example 1 is that the binder in the raw material components of the active particles is only waterborne polyurethane emulsion, i.e. the waterborne polyurethane emulsion is used to replace the epoxy emulsion in equal amount. The remaining steps remain unchanged.

[0128] Comparative Example 7

[0129] The difference between this comparative example and Example 1 is that the binder in the raw material components of the active particles is only epoxy emulsion, i.e. the epoxy emulsion is used to replace the waterborne polyurethane emulsion in equal amount. The remaining steps remain unchanged.

[0130] The antibacterial and deodorizing particles prepared in Examples 1-5 and Comparative Examples 1-7 are subjected to performance testing, and the results are recorded in Table 1.

[0131] The test method is as follows:

[0132] A sewage system containing milk (COD = 2000 mg / L, total number of colonies is 10 6 CFU / mL) is simulated, and the antibacterial and deodorizing particles prepared in each experimental group (Examples 1-5 and Comparative Examples 1-7) are added to the above sewage system at 16 g / L, with the blank system without the addition of antibacterial and deodorizing particles as the control group, and the system is statically treated at 25℃±2 for 14 days.

[0133] (1) Anti-bacterial test: on the 3rd day, 7th day and 14th day, the number of bacteria in each group was determined and the inhibition rate was calculated, inhibition rate (%) = (1-experimental group of bacteria number / control group of bacteria number) x 100%.

[0134] (2) Deodorization test: select 5 trained evaluators, on the 14th day, use fan smell method for olfactory, record the odor grade given by each evaluator (0 level: no odor; 1 level: very slight; 2 level: slight; 3 level: obvious; 4 level: strong; 5 level: extremely strong), take the majority of the same level as the final result.

[0135] Table 1

[0136]

[0137] As can be seen from Table 1, the antibacterial and deodorizing particles prepared in Examples 1-5 achieve long-term stable release for 14 days, and the number of bacteria is ≤10 CFU / mL after 14 days, the inhibition rate is ≥99.9%, and there is no odor. 2 As can be seen from Comparative Example 1, the lack of hydrophilic film protection will lead to initial burst release of the antibacterial and deodorizing particles, and poor long-term effect; as can be seen from Comparative Example 2, the lack of SEBS skeleton will cause the antibacterial and deodorizing particles to be easily disintegrated, and the active ingredients to be quickly lost; as can be seen from Comparative Examples 3-4, too high or too low SEBS molecular weight will cause the release of active ingredients to be blocked or too fast; as can be seen from Comparative Example 5, the lack of sodium stearate will cause the release rate to be unstable; as can be seen from Comparative Examples 6-7, the use of only water-based polyurethane emulsion as the binder will cause the antibacterial and deodorizing particles to swell and break, and the use of only epoxy emulsion will make the antibacterial and deodorizing particles too brittle, which will all cause the active ingredients to be released unevenly and unable to act continuously.

[0138] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An antibacterial deodorizing particle, characterized in that: It comprises active particles and a hydrophilic membrane wrapped around the outer surface of the active particles; The raw material components of the active particles include, by weight: 15-20 parts of SEBS, 8-15 parts of silicon dioxide, 10-20 parts of sepiolite powder, 6-16 parts of antibacterial agent, 2-5 parts of sodium stearate, 2-5 parts of sodium citrate, 5-10 parts of β-cyclodextrin, 18-27 parts of binder, and 1-3 parts of odor neutralizer; The hydrophilic membrane is formed from a hydrophilic material.

2. The antibacterial deodorant particles according to claim 1, characterized in that The hydrophilic material is selected from polyvinyl alcohol solution, the solid content of the polyvinyl alcohol solution is 15-25%, and the amount used is 3-8 parts by weight.

3. The antibacterial deodorant particles according to claim 1, wherein The molecular weight of the SEBS is 80,000-120,000.

4. The antibacterial deodorant particles according to claim 1, wherein The melting point of the sodium stearate is 62-65°C.

5. The antibacterial deodorant particles according to claim 1, wherein The adhesive is obtained by compounding water-based polyurethane emulsion and epoxy emulsion in a weight ratio of 0.5-1.2:1; The solid content of the aqueous polyurethane emulsion is 45-55% and the molecular weight is 8000-12000; The solid content of the epoxy emulsion is 45-55%, and the epoxy value is 0.80-0.

90.

6. The antibacterial deodorant particles according to claim 1, wherein The silica has a particle size of 50-100 nm and a specific surface area of ​​100-200 m 2 / g; The particle size of the sepiolite powder is 0.5-2 μm, and the pore size is 2-50 nm; The antimicrobial agent is selected from isothiazolinone compounds; The odor neutralizer is selected from natural plant extracts.

7. A method for preparing the antibacterial and deodorizing particles according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Blending SEBS, a binder, and an odor neutralizer, and then adding sepiolite powder, β-cyclodextrin, an antibacterial agent, silicon dioxide, sodium stearate, and sodium citrate to granulate to obtain active particles; S2. Dilute the hydrophilic material with water to prepare a membrane liquid, spray and wrap it on the surface of the active particles to form a hydrophilic film, and vacuum dry it to obtain antibacterial and deodorizing particles.

8. The method for preparing the antibacterial and deodorizing particles according to claim 7, wherein: In step S1, a pretreatment is further performed before the granulation, and the pretreatment includes activating the sepiolite powder and the β-cyclodextrin at 120-130° C. for 1-3 hours, and loading the antibacterial agent on the silica by an impregnation method.

9. The method for preparing the antibacterial and deodorizing particles according to claim 7, wherein: In step S1, the blending temperature is 50-60°C.

10. The method for preparing the antibacterial and deodorizing particles according to claim 7, wherein: In step S2, the concentration of the membrane-forming solution is 4-6 wt%; The vacuum drying temperature is 50-60°C.

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