Sterilizing deodorant for pets and preparation method thereof

Abstract

The invention belongs to the technical field of pet deodorization, and discloses a sterilization deodorant for pets and a preparation method. The pet sterilization deodorant is in a particle shape of a core-shell structure, a shell layer is a porous antibacterial film, and an inner core is a particle material loaded with natural antibacterial components; the porous antibacterial film is prepared from the following raw materials: chitosan, a silane modifier, polyethylene glycol, ammonium bicarbonate, nano zinc oxide and tea polyphenol. According to the sterilization deodorant for the pets and the preparation method of the sterilization deodorant, the core-shell structure design is combined with the porous antibacterial film and the natural antibacterial core, the synergistic effect of physical adsorption and chemical bacteriostasis is achieved, and the sterilization deodorant has the advantages of efficient sterilization, lasting deodorization, safety, environment friendliness and multiple functions; the preparation cost is low, the preparation process is simple, and good popularization and application values are achieved.

Description

Technical Field

[0001] This invention relates to the field of pet deodorization technology, and in particular to a pet bactericide and deodorizer and its preparation method. Background Technology

[0002] Pets' urine, feces, saliva, and anal glands can produce unpleasant odors, polluting the home environment. The odorous gases produced by pets are mainly multi-component, low-boiling-point, small-molecule mixtures, including ammonia, hydrogen sulfide, indole, and skatole. Prolonged exposure to these odorous gases can harm human health, affecting the respiratory, digestive, cardiovascular, and endocrine systems. Furthermore, pets often carry bacteria and fungi, and uncollected pet excrement can easily breed microorganisms. The addition of antibacterial and antimicrobial technologies can eliminate odors by inhibiting microbial growth. However, when using existing deodorizers, in addition to effectiveness, their safety and irritation levels must be carefully considered. Additionally, antibacterial and antimicrobial agents have limited effect on existing odors and odors not originating from bacteria. Summary of the Invention

[0003] The main objective of this invention is to develop a safe, environmentally friendly pet disinfectant and deodorizer with highly effective sterilization and long-lasting deodorization.

[0004] To achieve the above objectives, this invention proposes a pet disinfectant and deodorizer, wherein the pet disinfectant and deodorizer is a core-shell structured granular material, the shell being a porous antibacterial membrane, and the core being granules loaded with natural antibacterial components; the porous antibacterial membrane comprises the following raw materials in parts by weight: chitosan: 20-40 parts; silane modifier: 2-3 parts; polyethylene glycol: 15-30 parts; ammonium bicarbonate: 3-6 parts; nano zinc oxide: 2-3 parts; tea polyphenols: 1-2 parts; crosslinking agent: 0.6-1.5 parts.

[0005] In one embodiment, the silane modifier comprises polysulfide silane and long-chain alkyl silane in a weight ratio of 1:(1~3.5).

[0006] In one embodiment, the polysulfide includes bis-3-(trimethoxysilanepropyl)-disulfide.

[0007] In one embodiment, the long-chain alkylsilane includes at least one of dodecyltrimethoxysilane, hexadecyltrimethoxysilane, dodecylmethyldimethoxysilane, octylmethyldiethoxysilane, and octadecyltrimethoxysilane.

[0008] In one embodiment, the core of the pet disinfectant and deodorizer comprises the following raw materials in parts by weight: gallnut extract: 4 to 8 parts; yucca extract: 3 to 4 parts; thyme essential oil: 5 to 8 parts; zeolite powder: 80 to 100 parts; adsorbent: 20 to 30 parts.

[0009] In one embodiment, the method for preparing the adsorbent includes the following steps: Add 0.05M~0.1M EDTA solution dropwise to a 0.15M~0.3M manganese nitrate solution while stirring and reacting. After the reaction is complete, sonicate, centrifuge to collect the lower precipitate, wash, dry, and first place it in an empty atmosphere at 300℃~420℃ for 1.5h~2.5h, then place it in a protective atmosphere at 500℃~600℃ for 2~3h, grind, and obtain the adsorbent.

[0010] In one embodiment, the preparation method of the core of the pet disinfectant and deodorizer includes the following steps: The gallnut extract, yucca extract, and thyme essential oil were dissolved in an ethanol aqueous solution, and pretreated zeolite powder was added. The mixture was shaken at low temperature for 2-3 hours, dried under reduced pressure, pulverized and sieved, and the adsorbent was added. The mixture was then dry-granulated and extruded to obtain the core.

[0011] In one embodiment, the pretreatment of the zeolite powder includes: The zeolite powder was soaked in a 3wt%~8wt% hydrogen peroxide aqueous solution for 2h~5h, washed, then soaked in a 5wt% citric acid aqueous solution for 1h~2h, dried, and pulverized to 200 mesh to obtain pretreated zeolite powder.

[0012] In one embodiment, in the pet disinfectant and deodorizer, the mass ratio of the shell to the core is (0.15~0.45):1.

[0013] This invention also provides a method for preparing the aforementioned pet disinfectant and deodorizer, comprising the following steps: S1. Add the pre-hydrolyzed silane modifier to the chitosan aqueous solution and stir at 50℃~60℃ for 1h~2h. Then add polyethylene glycol and continue stirring for 0.5h~2h. Then add ammonium bicarbonate, nano zinc oxide and tea polyphenols, cool to 5℃~10℃, and sonicate for 10min~20min to obtain the shell liquid. S2. Place the core of the pre-prepared pet bactericide and deodorizer in a bottom spray centrifugal fluidized bed, spray the shell liquid prepared in step S1 onto the surface of the core, and after spraying, heat to 70℃~85℃ for reaction. After the reaction is completed, switch to cold air at (-15℃)~(-10℃) for shaping to obtain coated particles. S3. Immerse the coated particles from step S3 into a crosslinking agent solution, shake for 5 to 10 minutes, remove and dry, seal with nitrogen gas, and obtain a pet bactericide and deodorizer.

[0014] This application provides a pet bactericide and deodorizer and its preparation method. Through a core-shell structure design combined with a porous antibacterial membrane and a natural antibacterial core, it achieves the synergistic effect of physical adsorption and chemical antibacterial action. It has the advantages of high-efficiency sterilization, long-lasting deodorization, safety and environmental protection, and multiple functions. The preparation cost is low and the preparation process is simple, which has good promotion and application value. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0016] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0017] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0018] The technical problem addressed by this application is that, in existing technologies, the odorous gases produced by pet urine and feces contain various small molecules such as ammonia, hydrogen sulfide, and indole. Current deodorizers mainly rely on chemically synthesized components to inhibit microbial growth, but their effectiveness against non-bacterial odors is limited, and they pose a risk of irritation. Pet activity areas in the home environment need to balance safety and long-lasting antibacterial function; traditional single-structure deodorizing particles cannot achieve a synergistic effect of adsorption and decomposition with sustained antibacterial action.

[0019] To address the aforementioned issues, existing technologies cannot simultaneously handle the multi-component odor and microbial growth problems. Analysis of odor generation mechanisms reveals a time lag between odor molecule diffusion and microbial metabolism. This leads to a phased treatment approach: the outer structure rapidly captures and decomposes small odor molecules, while the inner structure continuously releases antibacterial components to inhibit microbial reproduction. Based on the selection of biocompatible materials, natural antibacterial ingredients are used to reduce irritation to pets' skin, and functional zoning is achieved through physical structural design.

[0020] To solve the above-mentioned technical problems, a pet disinfectant and deodorizer with good bactericidal and long-lasting effects has been developed.

[0021] This invention proposes a pet disinfectant and deodorizer, wherein the pet disinfectant and deodorizer is a core-shell structured granular material, the shell being a porous antibacterial membrane, and the core being granules loaded with natural antibacterial ingredients; the porous antibacterial membrane comprises the following raw materials in parts by weight: chitosan: 20-40 parts; silane modifier: 2-3 parts; polyethylene glycol: 15-30 parts; ammonium bicarbonate: 3-6 parts; nano zinc oxide: 2-3 parts; tea polyphenols: 1-2 parts; crosslinking agent: 0.6-1.5 parts.

[0022] It should be noted that the core-shell structure of the pet disinfectant and deodorizer in this application refers to composite particles composed of an outer coating layer and an inner core, which can be achieved through a fluidized bed coating process, with the outer membrane and core forming a physical isolation. The porous antibacterial membrane forms a porous structure through the thermal decomposition of polyethylene glycol and ammonium bicarbonate, enabling rapid gas molecule penetration. The porous antibacterial membrane forms a three-dimensional network framework through the condensation reaction of silane modifier and chitosan. During drying, polyethylene glycol and ammonium bicarbonate form gas channels, resulting in a uniformly distributed microporous structure. Nano-zinc oxide and tea polyphenols are fixed to the membrane surface through hydrogen bonding, forming a contact antibacterial interface. The core particles load natural antibacterial components through the adsorption of zeolite powder, gradually releasing effective substances under humidity triggering. When odor molecules contact the particle surface, the porous membrane preferentially adsorbs small molecules such as ammonia and hydrogen sulfide, while nano-zinc oxide catalyzes the decomposition of organic matter within the pores, and tea polyphenols inhibit zinc oxide aggregation.

[0023] By employing the above technical solution, this application can simultaneously treat complex odors generated by both bacterial and non-bacterial sources, eliminating odor molecules through the synergistic effect of physical adsorption and chemical decomposition. The core-shell structure's staged release mechanism prolongs the action time of antibacterial components, avoiding frequent replenishment of deodorants. The combination of porous membrane layers and natural antibacterial components ensures antibacterial efficacy while reducing the risk of chemical pollution and harm to pets and the environment.

[0024] In one embodiment, the silane modifier comprises polysulfide silane and long-chain alkyl silane in a weight ratio of 1:(1~3.5).

[0025] It should be noted that while silanes are commonly used for interface modification in conventional technologies, this application also utilizes silane modifiers as antibacterial components in porous antibacterial membranes. Specifically, the polysulfide silane is a bis-3-(trimethoxysilanepropyl)-disulfide, which releases thiol groups upon oxidation, achieving a sustained antibacterial effect. It also contains bissiloxane groups, which form dual-anchored crosslinks after hydrolysis. The reversible breakage and recombination of disulfide bonds endows the membrane with a certain self-healing ability. Furthermore, after long-chain alkyl silanes are grafted onto the surface of the porous antibacterial membrane, their hydrophobic properties prevent bacteria and other contaminants from adhering or causing deterioration. In terms of spatial structure, polysulfide silanes can graft and crosslink with chitosan molecular chains through sulfur bond breakage, forming a three-dimensional network structure that enhances the mechanical strength of the membrane. The hydrophobic segments of the long-chain alkyl silanes can increase the porosity of the membrane during film formation, thereby improving the release efficiency of the antibacterial components.

[0026] In one embodiment, the polysulfide includes bis-3-(trimethoxysilanepropyl)-disulfide.

[0027] It should be noted that bis-3-(triethoxysilanepropyl)-disulfide, as a modifier for chitosan membranes, has several advantages. First, the bissiloxane anchoring enhances the bonding force between polysulfide silanes and chitosan membranes, making them less prone to desorption compared to conventional mercaptosilanes. Second, disulfide bonds are more intelligent and stable than monothiol groups in antibacterial mechanisms, breaking only upon encountering reducing substances secreted by microorganisms to generate active thiol groups, thus achieving targeted bactericidal effects. Furthermore, the reversible breaking and recombination of disulfide bonds makes the antibacterial effect of the membrane more durable.

[0028] In one embodiment, the long-chain alkylsilane includes at least one of dodecyltrimethoxysilane, hexadecyltrimethoxysilane, dodecylmethyldimethoxysilane, octylmethyldiethoxysilane, and octadecyltrimethoxysilane.

[0029] It should be noted that the long-chain alkylsilanes in this application include silane compounds with carbon chain lengths ranging from 8 to 18 and substituted with methoxy or ethoxy groups. These compounds can exert a steric hindrance effect beneficial to the film structure, ensuring film uniformity while providing structural stability and controllable porosity. The steric hindrance of the long-chain alkyl groups reduces the hydrolytic activity of silanes, preventing premature gelation during processing. Furthermore, the directional hydrophobic barrier formed by the long-chain alkylsilanes reduces the migration of antibacterial components to the pet's skin surface. Controlled hydrolysis rates of specifically substituted silanes ensure the operability of the film-forming process, and the sulfur element in polysulfide silanes synergistically enhances antibacterial activity, ultimately reducing irritation to the pet's skin while maintaining highly effective antibacterial performance.

[0030] In one embodiment, the core of the pet disinfectant and deodorizer comprises the following raw materials in parts by weight: Gallnut extract: 4-8 parts; Yucca extract: 3-4 parts; Thyme essential oil: 5-8 parts; Zeolite powder: 80-100 parts; Adsorbent: 20-30 parts.

[0031] It should be noted that gallnut extract refers to the natural substance containing tannins extracted from gallnuts, specifically obtained through ethanol-water extraction; yucca extract mainly includes active substances such as saponins extracted from the yucca plant, obtained through water extraction and alcohol precipitation; thyme essential oil is a volatile oil extracted from thyme through distillation. The tannins in gallnut extract neutralize the alkaline odor components in pet excrement through the interaction of phenolic hydroxyl groups and amino groups, while simultaneously inhibiting bacterial protease activity. The saponin molecules in yucca extract selectively capture ammonia molecules through hydrophilic-hydrophobic interactions, reducing the concentration of irritating gases in the environment. Thyme essential oil releases antibacterial components during volatilization, creating a gaseous antibacterial environment while masking residual odors.

[0032] Furthermore, the pretreated zeolite powder, through its enlarged pore structure, loads the aforementioned active substances and forms a synergistic physical adsorption mechanism with the adsorbent: the mesoporous structure of the zeolite powder preferentially adsorbs large organic molecules such as skatole, while the microporous structure of the adsorbent decomposes small molecule gases such as hydrogen sulfide through redox reactions. The components, in a specific ratio, form a multi-level deodorization network, covering odor substances of different molecular weights and polarities.

[0033] In one embodiment, the method for preparing the adsorbent includes the following steps: Add 0.05M~0.1M EDTA solution dropwise to a 0.15M~0.3M manganese nitrate solution while stirring and reacting. After the reaction is complete, sonicate, centrifuge to collect the lower precipitate, wash, dry, and first place it in an empty atmosphere at 300℃~420℃ for 1.5h~2.5h, then place it in a protective atmosphere at 500℃~600℃ for 2~3h, grind, and obtain the adsorbent.

[0034] It should be noted that the specific molar ratio of manganese nitrate to EDTA, by controlling the ratio of metal ions to chelating agents, forms a precursor complex with a stable crystal structure. During ultrasonic treatment, high-frequency vibration ensures uniform dispersion of nanoparticles, preventing agglomeration that would reduce specific surface area. In the staged calcination process, a three-dimensional porous framework is formed in a low-temperature environment with limited oxidation, while the crystal transformation of the carbon-based material is completed in an inert atmosphere in the high-temperature stage, while preserving the mesoporous structure. By adjusting the temperature range and time parameters of the two calcinations, a gradient distribution of active sites is formed on the adsorbent surface, enhancing the capture ability of odor molecules with different polarities.

[0035] It should also be noted that by combining porous manganese dioxide adsorbent with zeolite powder, this invention enhances the adsorption and removal effect of the core of the bactericide and deodorizer on odors, and makes the deodorization effect more lasting through the synergy of the two, avoiding the problem of similar active sites being easily covered, and enhancing the synergistic adsorption effect on ammonia, hydrogen sulfide and indole mixed gases.

[0036] In one embodiment, the preparation method of the core of the pet disinfectant and deodorizer includes the following steps: The gallnut extract, yucca extract, and thyme essential oil were dissolved in an ethanol aqueous solution, and pretreated zeolite powder was added. The mixture was shaken at low temperature for 2-3 hours, dried under reduced pressure, pulverized and sieved, and the adsorbent was added. The mixture was then dry-granulated and extruded to obtain the core.

[0037] By employing the above technical solution, the tannins and tannins in gallnut extract bind to the zeolite surface through hydrogen bonds, forming a long-lasting antibacterial layer. Saponins from yucca extract and terpenes from thyme essential oil are co-encapsulated within the zeolite pores, gradually released under humidity triggering to neutralize organic odor molecules. Furthermore, the pretreated zeolite in this application exhibits a further increased specific surface area and a significantly increased number of surface hydroxyl groups, substantially enhancing the stable loading of natural antibacterial components within the zeolite carrier.

[0038] In one embodiment, the pretreatment of the zeolite powder includes: The zeolite powder was soaked in a 3wt%~8wt% hydrogen peroxide aqueous solution for 2h~5h, washed, then soaked in a 5wt% citric acid aqueous solution for 1h~2h, dried, and pulverized to 200 mesh to obtain pretreated zeolite powder.

[0039] It should be noted that the hydrogen peroxide treatment stage preferentially decomposes the oils or microbial metabolites carried by the zeolite powder, preventing impurities from clogging the pores and affecting subsequent loading effects. After washing, the powder proceeds to the citric acid treatment stage. The acidic conditions dissolve carbonate precipitates and neutralize the surface alkalinity, creating a negative charge on the zeolite powder surface and enhancing its binding force with the positively charged groups in natural antibacterial components. By adopting the above technical solution, the adsorption stability of zeolite powder for natural antibacterial components can be effectively improved.

[0040] In one embodiment, in the pet disinfectant and deodorizer, the mass ratio of the shell to the core is (0.15~0.45):1.

[0041] This application further discloses a method for preparing a pet disinfectant and deodorizer, comprising the following steps: S1. Add the pre-hydrolyzed silane modifier to the chitosan aqueous solution and stir at 50℃~60℃ for 1h~2h. Then add polyethylene glycol and continue stirring for 0.5h~2h. Then add ammonium bicarbonate, nano zinc oxide and tea polyphenols, cool to 5℃~10℃, and sonicate for 10min~20min to obtain the shell liquid. S2. Place the core of the pre-prepared pet bactericide and deodorizer in a bottom spray centrifugal fluidized bed, spray the shell liquid prepared in step S1 onto the surface of the core, and after spraying, heat to 70℃~85℃ for reaction. After the reaction is completed, switch to cold air at (-15℃)~(-10℃) for shaping to obtain coated particles. S3. Immerse the coated particles from step S3 into a crosslinking agent solution, shake for 5 to 10 minutes, remove and dry, seal with nitrogen gas, and obtain a pet bactericide and deodorizer.

[0042] In one specific embodiment, the pre-hydrolyzed silane modifier specifically includes: The silane modifier was dissolved in an aqueous ethanol solution, and acetic acid was added until the concentration reached 0.1M. The pre-hydrolysis reaction was carried out for 30 minutes to obtain the pre-hydrolyzed silane modifier.

[0043] It should be noted that a bottom-spray centrifugal fluidized bed refers to a device that uses bottom spraying combined with centrifugal force to achieve particle fluidization. Specifically, it can employ a structure where a rotating disk and an airflow distribution plate work together, its function being to achieve uniform coating of the core by the shell liquid. Cold air shaping refers to the rapid solidification of the coating layer using low-temperature airflow. Specifically, it can be achieved by using compressed air cooled by a refrigeration unit and then purging, its function being to maintain the integrity of the porous structure.

[0044] By employing the above technical solution, this application achieves controlled release of antibacterial components. Upon contact with pet excrement, the porous structure of the shell gradually releases the antibacterial agent, while the core continuously adsorbs odor molecules. The open pore structure maintained by the cold-air setting process enhances the adsorption efficiency for small molecule odors such as ammonia, and the cross-linked shell maintains its structural integrity even in humid environments. Nitrogen sealing effectively extends the shelf life of the natural active ingredients and prevents oxidative deactivation of the active ingredients during storage.

[0045] The present invention will be further illustrated below through specific embodiments: This invention does not impose specific restrictions on the source of raw materials. The sources of raw materials in the various embodiments of this invention are as follows: Example 1 In the pet disinfectant and deodorizer in Example 1, the shell layer accounts for approximately 19 wt%, and the core layer accounts for approximately 81 wt%.

[0046] The raw materials for the shell layer of the pet disinfectant and deodorizer in Example 1 are as follows: Chitosan: 350g; Bis-3-(trimethoxysilanepropyl)-disulfide: 10g; Dodecyltrimethoxysilane: 20g; Polyethylene glycol: 250g; Ammonium bicarbonate: 30g; Nano zinc oxide: 20g; Tea polyphenols: 10g; Crosslinking agent: Genipin: 8g.

[0047] Among them, the chitosan has a particle size of about 200 mesh; the polyethylene glycol used is PEG-6000; the D50 particle size of the nano zinc oxide is about 50nm; and the tea polyphenols are purchased from Hebei Asia-Pacific Biotechnology Co., Ltd., with product number 321457 and a purity of greater than or equal to 99%.

[0048] The core ingredients of the pet disinfectant and deodorizer in Example 1 are as follows: Gallnut extract: 50g; Yucca extract: 30g; Thyme essential oil: 50g; Zeolite powder: 1000g; Adsorbent: 200g.

[0049] Among them, gallnut extract was purchased from Indofine Chemical (USA), catalog number ST-10040, with a purity ≥90% (HPLC). Yucca extract was purchased from Shaanxi Xintianyu Biotechnology Co., Ltd., catalog number 5085147, with a purity ≥60%. Thyme essential oil was purchased from Jiangsu Pules Biotechnology Co., Ltd., with a purity ≥99%.

[0050] The preparation method of the adsorbent includes the following steps: Add approximately 0.1 M EDTA solution dropwise to a 0.3 M manganese nitrate solution while stirring and reacting. After the reaction is complete, sonicate for 20 min, centrifuge at 5000 r / min for 5 min, collect the precipitate, wash, dry, and first place it in an air atmosphere at 400 °C for 2 h, then place it in a protective atmosphere at 600 °C for 3 h, and grind it to 200 mesh to obtain the adsorbent.

[0051] The preparation method of the core of the pet disinfectant and deodorizer in Example 1 includes the following steps: Gallnut extract, yucca extract and thyme essential oil were dissolved in 500 mL of ethanol aqueous solution (1:1), pretreated zeolite powder was added, the mixture was shaken at 5°C for 2 h, dried under reduced pressure, pulverized through a 200-mesh sieve, adsorbent was added, the mixture was mixed, dry granulated, and extruded to obtain the core of the pet bactericide and deodorizer.

[0052] The pretreatment steps for zeolite powder include: soaking zeolite powder in a 5wt% hydrogen peroxide aqueous solution for 3 hours, filtering and washing it, then soaking it in a 5wt% citric acid aqueous solution for 2 hours, drying it at a constant temperature of 40℃, and pulverizing it to 200 mesh to obtain pretreated zeolite powder.

[0053] The preparation method of the pet disinfectant and deodorizer in Example 1 includes the following steps: S1. Dissolve bis-3-(trimethoxysilylpropyl)-disulfide and dodecyltrimethoxysilane in 100 mL of ethanol aqueous solution (1:1), add acetic acid until the concentration of acetic acid reaches 0.1 M, and pre-hydrolyze at 40 °C for 30 min to obtain pre-hydrolyzed silane modifier; add the pre-hydrolyzed silane modifier to 30 wt% chitosan aqueous solution, stir at 60 °C for 1 h, then add polyethylene glycol, continue stirring for 0.5 h, then add ammonium bicarbonate, nano zinc oxide and tea polyphenols, cool to 5 °C, and sonicate for 20 min to obtain shell liquid; S2. Place the core of the pre-prepared pet disinfectant and deodorizer in a bottom-spray centrifugal fluidized bed. Set the parameters of the bottom-spray centrifugal fluidized bed as follows: inlet air temperature: 40℃; atomization pressure: 0.8 bar; spray rate: 8 mL / min; fluidization air volume: 60 m³ / h. Spray the shell liquid obtained in step S1 onto the surface of the core. After spraying, raise the temperature to 70℃~85℃ and react for 30 min. After the reaction, switch to cold air at (-10℃) for 10 min to set the particles, thus obtaining coated particles. S3. Immerse the coated particles from step S3 in a crosslinking agent solution for 10 minutes, remove and dry them, then seal them with nitrogen gas to obtain a pet bactericide and deodorizer.

[0054] In step S3, the crosslinking agent solution is an ethanol-water solution (1:1) containing 0.3 wt% genipin.

[0055] Example 2 Example 2 is based on Example 1, except that the raw material ratio of the shell layer in the pet disinfectant and deodorizer in Example 2 is different, specifically including: Chitosan: 400g; Bis-3-(trimethoxysilanepropyl)-disulfide: 10g; Dodecyltrimethoxysilane: 10g; Polyethylene glycol: 150g; Ammonium bicarbonate: 30g; Nano zinc oxide: 20g; Tea polyphenols: 10g; Crosslinking agent: Genipin: 8g.

[0056] Example 3 Example 3 is based on Example 1, except that the proportion of the core ingredients in the pet disinfectant and deodorizer in Example 3 is different, specifically including: Gallnut extract: 40g; Yucca extract: 40g; Thyme essential oil: 80g; Zeolite powder: 1000g; Adsorbent: 300g.

[0057] Example 4 Example 4 is based on Example 1, except that the raw material ratios for the shell and core of the pet disinfectant and deodorizer in Example 4 are different, specifically including: The raw materials for the shell layer of the pet disinfectant and deodorizer in Example 4 are as follows: Chitosan: 250g; Bis-3-(trimethoxysilanepropyl)-disulfide: 10g; Dodecyltrimethoxysilane: 30g; Polyethylene glycol: 300g; Ammonium bicarbonate: 30g; Nano zinc oxide: 20g; Tea polyphenols: 10g; Crosslinking agent: Genipin: 8g.

[0058] The core ingredients of the pet disinfectant and deodorizer in Example 4 are as follows: Gallnut extract: 40g; Yucca extract: 50g; Thyme essential oil: 50g; Zeolite powder: 1000g; Adsorbent: 300g.

[0059] Comparative Example 1 Comparative Example 1 is based on Example 1, except that the silane modifier in the shell material of the pet disinfectant and deodorizer in Comparative Example 1 is replaced by 30g of dodecyltrimethoxysilane instead of 10g of bis-3-(trimethoxysilanepropyl)-disulfide and 20g of dodecyltrimethoxysilane.

[0060] Comparative Example 2 Comparative Example 2 is based on Example 1, except that the adsorbent in the core raw material of the pet bactericide and deodorizer in Comparative Example 2 is replaced with an equal amount of zeolite powder.

[0061] Performance testing (1) The deodorization performance of Examples 1-4 and Comparative Examples 1-2 was determined according to the standard CJ / T 516-2017 6.19. The specific steps included: under normal temperature and pressure conditions, 15L of pollutant gas was passed through a large bubble absorption tube containing 10mL of sample (diluted 20 times) at a flow rate of 1L / min for 24h, the treated gas was collected, the concentration was analyzed, and the deodorization efficiency of trimethylamine and hydrogen sulfide was calculated respectively.

[0062] (2) Inhibition zone experiment: 100 μl of bacterial suspension was aseptically aspirated in a biosafety cabinet and evenly spread on the surface of a solid culture plate. Pet disinfectant and deodorant from Examples 1-4 and Comparative Examples 1-2 were placed on sterile circular paper discs with a diameter of 7 mm, and then placed in the center of the solid culture dish. The negative control was a solid culture dish with a circular paper disc of sterile ultrapure water attached. After drying, the plates were closed, inverted, and placed in an incubator at 37°C. Three parallel experiments and one control experiment were set up for each group. E. coli was cultured for 12 h, and S. aureus for 24 h. The inhibition zone diameter was accurately measured three times using the cross-multiplication method, and the average value was taken as the final diameter.

[0063] Table 1 The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A pet disinfectant and deodorizer, characterized in that, The pet bactericide and deodorizer is in the form of core-shell structured particles, the shell being a porous antibacterial membrane, and the core being particles loaded with natural antibacterial ingredients. The porous antibacterial membrane comprises the following raw materials in parts by weight: Chitosan: 20-40 parts; Silane modifier: 2-3 parts; Polyethylene glycol: 15-30 parts; Ammonium bicarbonate: 3-6 parts; Nano zinc oxide: 2-3 parts; Tea polyphenols: 1 to 2 parts; cross-linking agent: 0.6 to 1.5 parts.

2. The pet disinfectant and deodorizer as described in claim 1, characterized in that, The silane modifier comprises polysulfide silanes and long-chain alkyl silanes in a weight ratio of 1:(1~3.5).

3. The pet disinfectant and deodorizer as described in claim 2, characterized in that, The polysulfide includes bis-3-(trimethoxysilanepropyl)-disulfide; And / or, the long-chain alkylsilane includes at least one of dodecyltrimethoxysilane, hexadecyltrimethoxysilane, dodecylmethyldimethoxysilane, octylmethyldiethoxysilane, and octadecyltrimethoxysilane.

4. The pet disinfectant and deodorizer as described in claim 1, characterized in that, The core of the pet disinfectant and deodorizer comprises the following raw materials in parts by weight: Gallnut extract: 4-8 parts; Yucca extract: 3-4 parts; Thyme essential oil: 5-8 parts; Zeolite powder: 80-100 parts; Adsorbent: 20-30 parts.

5. The pet disinfectant and deodorizer as described in claim 4, characterized in that, The method for preparing the adsorbent includes the following steps: Add 0.05M~0.1M EDTA solution dropwise to a 0.15M~0.3M manganese nitrate solution while stirring and reacting. After the reaction is complete, sonicate, centrifuge to collect the lower precipitate, wash, dry, and first place it in an empty atmosphere at 300℃~420℃ for 1.5h~2.5h, then place it in a protective atmosphere at 500℃~600℃ for 2~3h, grind, and obtain the adsorbent.

6. The pet disinfectant and deodorizer as described in claim 4, characterized in that, The preparation method of the core of the pet disinfectant and deodorizer includes the following steps: The gallnut extract, yucca extract, and thyme essential oil were dissolved in an ethanol aqueous solution, and pretreated zeolite powder was added. The mixture was shaken at low temperature for 2-3 hours, dried under reduced pressure, pulverized and sieved, and the adsorbent was added. The mixture was then dry-granulated and extruded to obtain the core.

7. The pet disinfectant and deodorizer as described in claim 6, characterized in that, The pretreatment of the zeolite powder includes: The zeolite powder was soaked in a 3wt%~8wt% hydrogen peroxide aqueous solution for 2h~5h, washed, then soaked in a 5wt% citric acid aqueous solution for 1h~2h, dried, and pulverized to 200 mesh to obtain pretreated zeolite powder.

8. The pet disinfectant and deodorizer as described in claim 1, characterized in that, In the pet disinfectant and deodorizer, the mass ratio of the shell to the core is (0.15~0.45):

1.

9. A method for preparing a pet disinfectant and deodorizer as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Add the pre-hydrolyzed silane modifier to the chitosan aqueous solution and stir at 50℃~60℃ for 1h~2h. Then add polyethylene glycol and continue stirring for 0.5h~2h. Then add ammonium bicarbonate, nano zinc oxide and tea polyphenols, cool to 5℃~10℃, and sonicate for 10min~20min to obtain the shell liquid. S2. Place the core of the pre-prepared pet bactericide and deodorizer in a bottom spray centrifugal fluidized bed, spray the shell liquid prepared in step S1 onto the surface of the core, and after spraying, heat to 70℃~85℃ for reaction. After the reaction is completed, switch to cold air at (-15℃)~(-10℃) for shaping to obtain coated particles. S3. Immerse the coated particles from step S3 into a crosslinking agent solution, shake for 5 to 10 minutes, remove and dry, seal with nitrogen gas, and obtain a pet bactericide and deodorizer.

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