Cat litter additive and preparation method therefor and use thereof, and cat litter and preparation method therefor

Abstract

The present invention relates to the field of pet supplies, and provides a cat litter additive, and a preparation method therefor and a use thereof, and a cat litter and a preparation method therefor. The preparation method for the cat litter additive of the present invention comprises: sequentially spraying a persulfate solution and a stabilizer solution on inorganic silica gel, and then drying under vacuum negative pressure at 15°C-80°C to obtain the cat litter additive, wherein the concentration of the persulfate solution ranges from 1 wt% to 40 wt%. The cat litter additive of the present invention has a high effective loading amount of persulfate. Combining the excellent adsorption performance of the inorganic silica gel with the characteristics of the persulfate in decomposing organic matters, odor molecules can be quickly adsorbed, and the odor molecules can be decomposed by contacting with the persulfate in pores of the inorganic silica gel, thereby eliminating odor and avoiding odor rebound. The preparation method for the cat litter containing the cat litter additive of the present invention is simple, and odor generated from pet excrement can be quickly and stably eliminated.

Description

Cat litter additives, their preparation methods, and applications; cat litter and its preparation methods. Technical Field

[0001] This invention relates to the field of pet product technology, specifically to a cat litter additive, its preparation method, and its application, as well as cat litter and its preparation method. Background Technology

[0002] When keeping pets, especially indoor pets, odor control of pet excrement is a key factor affecting the home environment. The excrement of cats or other animals has a strong odor to begin with, and if exposed to the air for a long time, it will produce an even stronger and more pungent odor due to bacterial decomposition. These odors will spread into the surrounding environment, causing people to feel disgusted and trigger physical discomfort.

[0003] Domestic cats typically use cat litter to bury their excrement. While regular cat litter has some odor-absorbing properties, the effect is limited. In recent years, cat litters with odor-reducing functions, such as those using probiotics or chemical decomposition, have emerged. However, these litters either lack stable odor-removing properties (e.g., probiotic litter's effectiveness depends on suitable probiotic survival conditions) or may pose a risk of irritating pets. For example, litters with added chemicals may irritate a cat's skin or fur, leading to health problems. Additionally, there are functional cat litters on the market with enhanced absorption capabilities, such as inorganic silica gel litter. Because inorganic silica gel has numerous pores and a large specific surface area, it can absorb odor molecules from the air. However, this absorption is reversible physical adsorption. Therefore, while inorganic silica gel litter has some odor-removing effect, the odor molecules adsorbed on the surface can be released again, resulting in poor odor removal over long-term use. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention discloses a cat litter additive, its preparation method, and its application. This cat litter additive can not only effectively absorb the odor of cat excrement, but also decompose these odors to eliminate them. By mixing this cat litter additive with other basic cat litter, cat litter with excellent deodorizing effect, stable deodorizing performance, and environmentally friendly and non-irritating properties can be obtained.

[0005] To achieve the above technical objectives, on the one hand, the present invention proposes a method for preparing a cat litter additive, which includes spraying a persulfate solution and a stabilizer solution sequentially onto an inorganic silica gel, and then drying it under vacuum negative pressure and at 15℃-80℃ to obtain the cat litter additive; wherein the concentration of the persulfate solution is 1wt%-40wt%.

[0006] The above technical solution involves spraying a persulfate solution to uniformly penetrate the pores of inorganic silica gel. Combined with the spraying of a stabilizer solution, this allows the persulfate to penetrate even deeper into the pores of the inorganic silica gel. Subsequent drying allows the persulfate and stabilizer to form a uniform loading layer within the silica gel pores, resulting in the cat litter additive. Experimental findings of this invention have shown that, compared to other commonly used carriers such as activated carbon, diatomaceous earth, and molecular sieves, using inorganic silica gel as a persulfate carrier yields better persulfate loading. This cat litter additive combines the excellent adsorption properties of inorganic silica gel with the ability of persulfate to decompose organic matter. It can quickly and stably adsorb odor molecules and promote their contact and decomposition with the persulfate within the pores of the inorganic silica gel, thereby eliminating odors without any odor rebound. Furthermore, the persulfate contained in this cat litter additive exists within the tiny pores of the inorganic silica gel, avoiding direct contact with the pet's skin and causing no irritation.

[0007] It is also worth noting that persulfate itself decomposes under heat, and the presence of transition metal ions or contact with organic matter during cat litter processing will catalyze and accelerate the decomposition of persulfate, leading to the failure of the cat litter's deodorizing effect. Based on extensive experimental data, the above technical solution uses a spraying method to uniformly disperse a persulfate solution and a stabilizer solution within the pores of inorganic silica gel, and then dries it under vacuum negative pressure at 15℃-80℃, thereby inhibiting the decomposition of persulfate during the drying process, resulting in a cat litter additive with an effective persulfate loading.

[0008] In the above technical solution, setting an appropriate concentration of persulfate can avoid reducing the persulfate spraying efficiency and increasing the difficulty of subsequent drying due to too low a concentration. Additionally, a suitable upper limit for the persulfate concentration is set for cost considerations. The embodiments and comparative examples of the present invention show that cat litter containing the above-mentioned cat litter additives maintains excellent deodorizing effects even after cats have buried the litter for 5 days.

[0009] In another aspect, the present invention provides a cat litter additive prepared by the above-described method for preparing cat litter additives.

[0010] In another aspect of the present invention, the application of the above-mentioned cat litter additive in the preparation of cat litter is proposed.

[0011] In another aspect of the present invention, cat litter comprising the above-described cat litter additives is proposed.

[0012] In another aspect, the present invention provides a method for preparing the above-mentioned cat litter, the method comprising the following steps:

[0013] (1) Basic cat litter is prepared using raw materials other than the cat litter additives mentioned above;

[0014] (2) The cat litter additive is mixed evenly with the base cat litter at room temperature. This method is simple to prepare and can be widely promoted and mass-produced.

[0015] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention involves sequentially spraying a persulfate solution and a persulfate stabilizer solution of appropriate concentration onto inorganic silica gel, and then drying them under vacuum negative pressure and suitable temperature conditions to obtain a cat litter additive. This preparation method is simple to operate and can be scaled up for production. The cat litter additive of this invention has a high effective loading capacity of persulfate. Combined with the excellent adsorption properties of inorganic silica gel and the characteristic of persulfate decomposing organic matter, it can quickly adsorb odor molecules and promote the contact and decomposition of odor molecules with persulfate within the pores of inorganic silica gel, thereby eliminating odors and preventing odor rebound. The preparation method of cat litter containing the cat litter additive of this invention is simple and can quickly and stably eliminate odors produced by pet excrement. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 is a schematic diagram of a method for preparing the cat litter additive of the present invention. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more comprehensive description will be provided below, along with preferred embodiments. However, it should be understood that these embodiments are merely for more detailed explanation and should not be construed as limiting the invention in any way, i.e., not intended to limit the scope of protection of the invention.

[0019] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the art to which this invention pertains. Unless otherwise specified, the experimental reagents used in the following embodiments are conventional biochemical reagents; and the experimental methods described are conventional methods.

[0020] It should be noted that the persulfate-containing inorganic silica gel obtained in this invention was tested for persulfate content according to the national standard GB / T 23940-2021 "Analytical Methods for Industrial Persulfate Products".

[0021] In addition, the inorganic silica gel used in this invention was purchased from Qingdao Junqiang New Materials Co., Ltd.; the ammonium persulfate, sodium persulfate, potassium persulfate, sodium silicate, and trisodium phosphate used in this invention were all chemically pure and purchased from a reagent store; the silica sol was a product of Qingdao Junqiang New Materials Co., Ltd. The basic cat litter (tofu cat litter, wood chip cat litter, bentonite cat litter) used in this invention was produced by Yumeng Information Technology (Suzhou) Co., Ltd.; the coconut shell activated carbon, molecular sieve, and diatomaceous earth used in this invention were all chemically pure and purchased from a reagent store.

[0022] On one hand, this invention discloses a method for preparing a cat litter additive. The method includes sequentially spraying a persulfate solution and a stabilizer solution onto inorganic silica gel, followed by drying under vacuum negative pressure at 15℃-80℃ to obtain the cat litter additive; wherein the concentration of the persulfate solution is 1wt%-40wt%. Figure 1 shows a schematic diagram of the persulfate solution penetrating into the pores of the inorganic silica gel and forming a load layer after drying.

[0023] In the above technical solution, the concentration of the persulfate can be selected as 1wt%, 3wt%, 5wt%, 7wt%, 9wt%, 10wt%, 13wt%, 15wt%, 17wt%, 19wt%, 20wt%, 22wt%, 24wt%, 26wt%, 28wt%, 30wt%, 31wt%, 33wt%, 35wt%, 36wt%, 37wt%, 38wt%, 39wt%, or 40wt%, but is not limited to the listed ranges. Other unlisted values ​​within the above ranges are also applicable to this invention. In a further example of this invention, the concentration of the persulfate was explored and optimized. Optionally, the concentration of the persulfate solution is 5wt%-37wt%. Embodiments of this invention illustrate the process of preparing cat litter additives with different concentrations of persulfate.

[0024] In a further example of the invention, the types of persulfates were explored and optimized. Optionally, the persulfate includes at least one of ammonium persulfate, sodium persulfate, and potassium persulfate. Embodiments of the invention illustrate the preparation process of cat litter additives loaded with different persulfates.

[0025] In a further example of the present invention, the mass ratio of the persulfate solution to the inorganic silica gel can be selected as (0.1-0.9):1, such as 0.1:1, 0.15:1, 0.2:1, 0.25:1, 0.3:1, 0.35:1, 0.4:1, 0.45:1, 0.5:1, 0.55:1, 0.6:1, 0.65:1, 0.7:1, 0.75:1, 0.8:1, 0.85:1, 0.9:1, but is not limited to the listed ranges. Other unlisted values ​​within the above ranges are also applicable to the present invention. An embodiment of the present invention shows that when 0.15-0.85 times the mass of persulfate is sprayed onto the inorganic silica gel and dried under vacuum negative pressure and suitable temperature conditions, a cat litter additive with effective persulfate loading can be obtained. In a further example of the present invention, the mass ratio of the persulfate solution to the inorganic silica gel is preferably (0.15-0.85):1.

[0026] In a further example of the invention, the concentration of the stabilizer solution was explored. Optionally, the stabilizer solution is an aqueous solution with a stabilizer mass concentration of 5%-30%, such as 5%, 6%, 7%, 8%, 9%, 10%, 13%, 15%, 17%, 20%, 23%, 25%, 27%, or 30%, but not limited to the listed ranges. Other unlisted values ​​within the above ranges are also applicable to the invention.

[0027] In a further example of the invention, the types of stabilizers were explored. Optionally, the stabilizer is one or more of trisodium phosphate, silica sol, and sodium silicate; wherein the silica sol is an acidic silica sol or a sodium-type silica sol with a silica content of 30wt%-40wt%. The sodium-type silica sol refers to an alkaline silica sol stabilized by sodium ions.

[0028] In a further example of the present invention, the mass ratio of the stabilizer to the inorganic silica gel is (0.001-0.05):1, such as 0.001:1, 0.005:1, 0.01:1, 0.02:1, 0.03:1, 0.04:1, 0.05:1, but is not limited to the listed range. Other unlisted values ​​within the above range are also applicable to the present invention. Optimizing the mass ratio of the stabilizer to the inorganic silica gel is beneficial for the stabilizer and the persulfate to form a uniform and stable loading layer on the surface of the inorganic silica gel. In an optional example of the present invention, the preferred mass ratio of the stabilizer to the inorganic silica gel is (0.01-0.05):1.

[0029] In a further example of the invention, the control conditions for the vacuum negative pressure were explored, which can be selected from 0.6-101 kPa, such as 0.6 kPa, 0.61 kPa, 0.8 kPa, 1 kPa, 3 kPa, 3.1 kPa, 3.3 kPa, 5 kPa, 5.2 kPa, 7 kPa, 8 kPa, 8.3 kPa, 10 kPa, 10.8 kPa, 14 kPa, 15 kPa, 18 kPa, 19 kPa, 19.8 kPa, 20 kPa, 20.1 kPa, 25 kPa, 30 kPa, and 35 kPa. a. 40 kPa, 45 kPa, 50 kPa, 55 kPa, 60 kPa, 65 kPa, 70 kPa, 75 kPa, 80 kPa, 85 kPa, 90 kPa, 95 kPa, 100 kPa, 101 kPa, but not limited to the listed ranges; other unlisted values ​​within the above ranges are also applicable to the present invention; drying is performed under suitable vacuum negative pressure conditions, thereby inhibiting the decomposition of persulfate during the drying process and improving drying efficiency; in a further example of the present invention, the vacuum negative pressure is preferably 0.6-20 kPa.

[0030] In the above technical solutions, the drying temperature can be selected from 15℃, 20℃, 25℃, 30℃, 40℃, 45℃, 50℃, 55℃, 60℃, 65℃, 70℃, 75℃, 80℃, etc., but is not limited to the listed range. Other values ​​not listed within the above range are also applicable to this invention. In a further example of this invention, the drying temperature has been optimized. Optionally, the drying temperature is 15℃-70℃. The embodiments and comparative examples of this invention show that performing the drying operation at a suitable drying temperature can effectively prevent the decomposition of persulfate, resulting in a cat litter additive with effective persulfate loading.

[0031] In a further example of the present invention, the types of inorganic silica gel were explored. Optionally, the inorganic silica gel is at least one of type A silica gel, type B silica gel, and type C silica gel. In the actual preparation process, one or more of type A silica gel, type B silica gel, and type C silica gel can be selected to prepare the cat litter additive of the present invention.

[0032] It should be noted that the morphology of the inorganic silica gel is not limited in this invention; it can be spherical, blocky, or other irregular shapes. In a further example of this invention, the size of the inorganic silica gel has been explored and optimized. Optionally, the particle size of the inorganic silica gel is 0.1-20 mm, such as 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 13 mm, 15 mm, 17 mm, 19 mm, and 20 mm, but is not limited to the listed ranges. Other unlisted values ​​within the above ranges are also applicable to this invention. In an optional example of this invention, the particle size of the inorganic silica gel is preferably 3-20 mm. It should be noted that the particle size of the inorganic silica gel in this invention refers to the diameter of a single inorganic silica gel particle. When the inorganic silica gel particle is non-spherical or irregular in shape, the particle size of the inorganic silica gel is the equivalent diameter, that is, the particle size of the inorganic silica gel particle is represented by the diameter of a spherical particle with the same volume.

[0033] It should be noted that the persulfate solution in this invention is obtained by dissolving persulfate in water.

[0034] It should be noted that the specific operations for promoting the uniformity of spraying the persulfate solution and the stabilizer solution onto the inorganic silica gel are not limited in this invention. For example, the inorganic silica gel may be stirred or disturbed during the spraying process, or the number of nozzles may be increased, or a suitable nozzle distribution pattern may be set, or the nozzle spraying angle may be adjusted, etc. Those skilled in the art can choose a suitable spraying method as needed, which does not limit the scope of protection of this invention.

[0035] On the other hand, the present invention proposes a cat litter additive, which is prepared by the above-mentioned method for preparing cat litter additives.

[0036] Furthermore, the persulfate loading in the cat litter additive is 0.9%-20% of the mass of the cat litter additive, for example, 0.9%, 1%, 1.5%, 2%, 3%, 3.5%, 3.6%, 4%, 4.5%, 4.6%, 4.7%, 5%, 5.1%, 5.5%, 6%, 6.3%, 6.5%, 7%, 7.5%, 8%, 8.3%, 9%, 9.3%, 9.5%, 10%, 11%, 13%, 15%, 17%, 18%, 18.5%, 18.7%, 19%, 19.5%, 20%, but is not limited to the listed ranges. Other unlisted values ​​within the above ranges are also applicable to this invention.

[0037] On the other hand, the application of the above-mentioned cat litter additives in the preparation of cat litter.

[0038] On the other hand, the present invention proposes a cat litter containing the above-mentioned cat litter additives.

[0039] On the other hand, the present invention proposes a method for preparing the above-mentioned cat litter, which includes the following steps:

[0040] (1) Basic cat litter is prepared using raw materials other than the cat litter additives mentioned above;

[0041] (2) The cat litter additive is mixed evenly with the base cat litter under normal temperature conditions.

[0042] In actual cat litter preparation, the base cat litter can be selected from tofu cat litter, wood chip cat litter, bentonite cat litter or other commercially available cat litter, and those skilled in the art can choose according to their needs.

[0043] Further, the mass ratio of the cat litter additive to the base cat litter is (0.01-0.5):1, such as 0.01:1, 0.02:1, 0.03:1, 0.04:1, 0.05:1, 0.07:1, 0.1:1, 0.15:1, 0.2:1, 0.25:1, 0.3:1, 0.35:1, 0.4:1, 0.45:1, 0.5:1, but is not limited to the listed range. Other unlisted values ​​within the above range are also applicable to this invention. In an optional example of this invention, the mass ratio of the cat litter additive to the base cat litter is preferably (0.3-0.5):1. This invention illustrates the cat litter preparation process and deodorizing effect of different amounts of cat litter additive.

[0044] Example 1

[0045] A method for preparing a cat litter additive includes: uniformly spraying a 37% (w / w) ammonium persulfate solution onto a C-type silica gel, followed by spraying a 20% (w / w) sodium silicate solution; the C-type silica gel is spherical with a particle size of 3-5 mm; 25 grams of the ammonium persulfate solution are sprayed per 100 grams of the inorganic silica gel, with a sodium silicate to inorganic silica gel mass ratio of 0.03:1; after spraying, drying is carried out at 65°C and 19.8 kPa; after drying for 2 hours, the mixture is weighed, and then dried again under the same conditions for 1 hour, and weighed again. The cat litter additive is considered to be fully dried when the weight difference between the two weighings is less than 2%. Testing shows that the persulfate loading in the cat litter additive prepared in this embodiment is 6.3%.

[0046] Example 2

[0047] A method for preparing a cat litter additive includes: uniformly spraying a 37% (w / w) ammonium persulfate solution onto type A silica gel, followed by spraying a 5% (w / w) trisodium phosphate solution; the type A silica gel is spherical with a particle size of 3-5 mm; 70 g of the ammonium persulfate solution is sprayed per 100 g of the inorganic silica gel, with a trisodium phosphate to inorganic silica gel mass ratio of 0.05:1; after spraying, drying is carried out at 30°C and 3.1 kPa; after drying for 8 hours, the mixture is weighed, and then dried again under the same conditions for 1 hour, and weighed again. The cat litter additive is considered to be fully dried when the weight difference between the two weighings is less than 2%. Testing showed that the persulfate loading in the cat litter additive prepared in this embodiment is 18.7%.

[0048] Example 3

[0049] A method for preparing a cat litter additive includes: uniformly spraying a 36% (w / w) ammonium persulfate solution onto a type C silica gel, and then spraying a 30% (w / w) sodium silica sol; the type C silica gel is in block form with a particle size of 3-20 mm; 80 grams of the ammonium persulfate solution are sprayed on every 100 grams of the inorganic silica gel, and the mass ratio of silica to inorganic silica gel in the sodium silica sol is 0.05:1; after spraying, drying is carried out at room temperature and 0.61 kPa; after drying for 5 hours, the mixture is weighed, and then dried again under the same conditions for 1 hour, and weighed again. The cat litter additive is considered to be fully dried when the weight difference between the two weighings is less than 2%. Testing showed that the persulfate loading in the cat litter additive prepared in this embodiment is 19.5%.

[0050] Example 4

[0051] A method for preparing a cat litter additive includes: uniformly spraying a 5% (w / w) potassium persulfate solution onto a type C silica gel, followed by spraying a 20% (w / w) acidic silica sol; the type C silica gel is in block form with a particle size of 3-20 mm; 80 grams of the potassium persulfate solution are sprayed onto every 100 grams of the inorganic silica gel, and the mass ratio of silica to inorganic silica gel in the acidic silica sol is 0.01:1; after spraying, drying is carried out at 70°C and 20.1 kPa; after drying for 4 hours, the mixture is weighed, and then dried again under the same conditions for 1 hour, and weighed again. The cat litter additive is considered to be fully dried when the weight difference between the two weighings is less than 2%. Testing shows that the persulfate loading in the cat litter additive prepared in this embodiment is 3%.

[0052] Example 5

[0053] A method for preparing a cat litter additive includes: uniformly spraying a 36% (w / w) sodium persulfate solution onto type B silica gel, followed by spraying a 15% (w / w) sodium silicate solution; the type B silica gel is spherical with a particle size of 3-5 mm; 15 grams of the sodium persulfate solution are sprayed on every 100 grams of the inorganic silica gel, with a mass ratio of sodium silicate to inorganic silica gel of 0.01:1; after spraying, drying is carried out at 50°C and 10.8 kPa; after drying for 5 hours, the mixture is weighed, and then dried again under the same conditions for 1 hour, and weighed again. The cat litter additive is considered to be fully dried when the weight difference between the two weighings is less than 2%. Testing showed that the persulfate loading in the cat litter additive prepared in this embodiment is 4.6%.

[0054] Example 6

[0055] A method for preparing a cat litter additive includes: uniformly spraying a 5% (w / w) sodium persulfate solution onto C-type silica gel, followed by spraying a 10% (w / w) trisodium phosphate solution; the C-type silica gel is in block form with a particle size of 3-20 mm; 85 grams of the sodium persulfate solution are sprayed per 100 grams of the inorganic silica gel, with a trisodium phosphate to inorganic silica gel mass ratio of 0.008:1; after spraying, drying is carried out at 45°C and 5.2 kPa; after drying for 5 hours, the mixture is weighed, and then dried again under the same conditions for 1 hour, and weighed again. The cat litter additive is considered to be fully dried when the weight difference between the two weighings is less than 2%. Testing shows that the persulfate loading in the cat litter additive prepared in this embodiment is 3.6%.

[0056] Example 7

[0057] A method for preparing a cat litter additive includes: uniformly spraying a 10% (w / w) sodium persulfate solution onto a type C silica gel, followed by spraying a 20% (w / w) sodium silica sol; the type C silica gel is spherical with a particle size of 0.1-2 mm; 70 grams of the sodium persulfate solution are sprayed on every 100 grams of the inorganic silica gel, and the mass ratio of silica to inorganic silica gel in the sodium silica sol is 0.03:1; after spraying, drying is carried out at 45°C and 8.3 kPa; after drying for 4 hours, the mixture is weighed, and then dried again under the same conditions for 1 hour, and weighed again. The cat litter additive is considered to be fully dried when the weight difference between the two weighings is less than 2%. Testing shows that the persulfate loading in the cat litter additive prepared in this embodiment is 4.7%.

[0058] Example 8

[0059] A method for preparing a cat litter additive includes: uniformly spraying a 5% (w / w) potassium persulfate solution onto type B silica gel, followed by spraying a 30% (w / w) trisodium phosphate solution; the type B silica gel is spherical with a particle size of 3-5 mm; 40 grams of the potassium persulfate solution are sprayed per 100 grams of the inorganic silica gel, with a trisodium phosphate to inorganic silica gel mass ratio of 0.001:1; after spraying, drying is performed at 70°C and 20.1 kPa; after drying for 3 hours, the mixture is weighed, and then dried again under the same conditions for 1 hour, and weighed again. The cat litter additive is considered sufficiently dried when the weight difference between the two weighings is less than 2%. Testing shows that the persulfate loading in the cat litter additive prepared in this embodiment is 0.9%.

[0060] Comparative Example 1

[0061] A method for preparing a cat litter additive is disclosed. The preparation process of the cat litter additive in this comparative example is the same as that shown in Example 2, except that after spraying with ammonium persulfate, drying is performed at 100°C and normal pressure. After 12 hours of drying, the inorganic silica gel loaded with ammonium persulfate was still not completely dried.

[0062] Comparative Example 2

[0063] A method for preparing a cat litter additive is disclosed. The preparation process of the cat litter additive in this comparative example is the same as that shown in Example 3, except that after spraying with ammonium persulfate, it is dried at 120°C and 91 kPa. After drying for 8 hours, the additive is weighed, and then dried again under the same conditions for 1 hour. The weight difference between the two weighings is less than 2%, indicating that the additive is sufficiently dried, thus obtaining the cat litter additive. Testing revealed no detectable persulfate loading in the prepared cat litter additive.

[0064] Comparative Example 3

[0065] A method for preparing a cat litter additive is disclosed. In this comparative example, the preparation process of the cat litter additive is the same as that shown in Example 3. The inorganic silica gel is impregnated with an excess of ammonium persulfate solution for approximately 12 hours, followed by drying at room temperature and 0.61 kPa. After 12 hours of drying, the ammonium persulfate-loaded inorganic silica gel is still not completely dry.

[0066] Comparative Example 4

[0067] A method for preparing a cat litter additive includes: uniformly spraying a 37% (w / w) sodium persulfate solution onto coconut shell activated carbon, wherein the coconut shell activated carbon is in 1-5 mm block form; spraying 50 g of the sodium persulfate solution onto every 100 g of inorganic silica gel; drying at 50°C and 10.8 kPa after spraying; weighing after drying for 5 hours, and then weighing again after drying for 1 hour under the same conditions; the cat litter additive is considered to be fully dried when the weight difference between the two weighings is less than 2%. Testing revealed no detectable persulfate loading in the prepared cat litter additive.

[0068] Comparative Example 5

[0069] A method for preparing a cat litter additive includes: uniformly spraying a 22% (w / w) sodium persulfate solution onto diatomaceous earth, wherein the diatomaceous earth is in 3-20 mm block form; spraying 50 g of the sodium persulfate solution onto every 100 g of the inorganic silica gel; drying at 55°C and 14 kPa after spraying; weighing after drying for 3 hours, and then weighing again after drying for 1 hour under the same conditions; the cat litter additive is considered to be fully dried when the weight difference between the two weighings is less than 2%. The cat litter additive is then obtained. Testing shows that the persulfate loading in the prepared cat litter additive is 0.4%.

[0070] Comparative Example 6

[0071] A method for preparing a cat litter additive includes: uniformly spraying a 36% (w / w) sodium persulfate solution onto a molecular sieve, the molecular sieve being 3-5 mm spherical; spraying 15 g of the sodium persulfate solution onto every 100 g of the inorganic silica gel; drying at room temperature and 0.66 kPa after spraying; weighing after drying for 3 hours, and then weighing again after drying for 7 hours under the same conditions; the cat litter additive is considered to be fully dried when the weight difference between the two weighings is less than 2%. Testing revealed that the persulfate loading in the prepared cat litter additive was 0.3%.

[0072] Comparative Example 7

[0073] A method for preparing a cat litter additive is disclosed. The preparation process of the cat litter additive in this comparative example is the same as that shown in Example 3, except that a stabilizer solution was not sprayed in this comparative example. Testing revealed that the persulfate loading in the prepared cat litter additive was 8.6%.

[0074] By combining Examples 1-8 and Comparative Examples 1-3, it can be confirmed that the preparation method of the cat litter additive of the present invention involves spraying an appropriate concentration of persulfate solution onto inorganic silica gel and drying it under appropriate pressure and temperature conditions to obtain inorganic silica gel with effective persulfate loading. Combining Examples 1-8 and Comparative Examples 4-6, it can be found that the present invention uses inorganic silica gel as a carrier, which, compared to using activated carbon, diatomaceous earth, or molecular sieves as carriers for loading persulfate and stabilizers, yields a cat litter additive with a higher loading capacity.

[0075] Example 9

[0076] A method for preparing cat litter, specifically: using tofu cat litter as the base cat litter, and mixing it with the cat litter additive prepared in Example 5 and the base cat litter at a mass ratio of 0.1:1.

[0077] Examples 9-21: Each example presents a method for preparing cat litter. The method for preparing cat litter in each example is the same as that in Example 10, except that the base cat litter and / or cat litter additives, and / or the mass ratio of base cat litter to cat litter additives are different. Specific parameters and parameter control ranges are shown in Table 1.

[0078] Comparative Examples 8-19: A method for preparing cat litter was proposed for each comparative example. The method for preparing cat litter in each comparative example was the same as that in Example 11. The difference was that the base cat litter and / or cat litter additives used, and / or the mass ratio of base cat litter to cat litter additives were different. The specific parameters and parameter control ranges are shown in Table 1.

[0079] Test case

[0080] The cat litter prepared in Examples 8-21 and the cat litter prepared in Comparative Examples 8-19 were used to test the deodorization performance. Specifically, the above cat litter was poured into cat litter boxes of the same size, with 9 kg of cat litter in each litter box. After the cat litter was laid out, it was used by 5 cats for 5 days. During this period, normal litter cleaning and cat litter cleaning were carried out, but no new cat litter was added. Then, the odor was judged manually.

[0081] In this test, the odor was divided into three levels: noticeable odor, slight odor, and no odor. The specific test results are shown in Table 1.

[0082] Table 1

[0083]

[0084] As demonstrated by the test examples and comparative test examples in Table 1, the cat litter containing the present invention exhibits a more significant long-term deodorizing effect compared to the comparative cat litter without added or with directly added inorganic silica gel. Furthermore, compared to the comparative cat litter with directly added inorganic silica gel, the cat litter of the present invention requires a lower amount of inorganic silica gel relative to the base cat litter while achieving the same or better long-term deodorizing effect, demonstrating good economic benefits. Combined with test example 14 and comparative test example 12, it can be verified that the cat litter additive preparation method of the present invention, by spraying persulfate onto inorganic silica gel and then spraying a stabilizer, can improve the long-term deodorizing effect of the cat litter.

[0085] It should be noted that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and it should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple improvements can be made without departing from the concept of the present invention, and all such improvements should be considered to fall within the scope of protection of the present invention.

Claims

1. A method for preparing a cat litter additive, characterized in that, The preparation method includes: sequentially spraying a persulfate solution and a stabilizer solution onto inorganic silica gel, and then drying it under vacuum negative pressure and at 15℃-80℃ to obtain the cat litter additive; wherein the concentration of the persulfate solution is 1wt%-40wt%.

2. The method for preparing the cat litter additive according to claim 1, characterized in that, The concentration of the persulfate solution is 5wt%-37wt%; And / or, the persulfate includes at least one of ammonium persulfate, sodium persulfate, and potassium persulfate; Preferably, the mass ratio of the persulfate solution to the inorganic silica gel is (0.1-0.9):1, more preferably (0.15-0.85):

1.

3. The method for preparing the cat litter additive according to claim 1, wherein the stabilizer solution is an aqueous solution with a stabilizer mass concentration of 5%-30%; Preferably, the stabilizer is one or more selected from trisodium phosphate, silica sol, and sodium silicate; wherein, The silica sol is an acidic silica sol or a sodium silica sol with a silica content of 30wt%-40wt%. Preferably, the mass ratio of the stabilizer to the inorganic silica gel is (0.001-0.05):1, more preferably (0.01-0.05):

1.

4. The method for preparing the cat litter additive according to claim 1, characterized in that, The vacuum negative pressure is 0.6-101 kPa, preferably 0.6-20 kPa; And / or, the drying temperature is 15℃-70℃.

5. The method for preparing the cat litter additive according to claim 1, characterized in that, The inorganic silicone is at least one of type A silicone, type B silicone, and type C silicone; Preferably, the inorganic silica gel has a particle size of 0.1-20 mm, more preferably 3-20 mm.

6. A cat litter additive, characterized in that, The cat litter additive is prepared by the method described in any one of claims 1-5.

7. The cat litter additive according to claim 6, characterized in that, The persulfate loading in the cat litter additive is 0.9%-20% of the mass of the cat litter additive.

8. The use of the cat litter additive of claim 6 or 7 in the preparation of cat litter.

9. Cat litter containing the cat litter additive of claim 6 or 7.

10. The method for preparing cat litter according to claim 9, characterized in that, The following steps are included: (1) Basic cat litter is prepared using raw materials other than the cat litter additives mentioned above; (2) The cat litter additive is mixed evenly with the base cat litter under normal temperature conditions to obtain the product; Preferably, the mass ratio of the cat litter additive to the base cat litter is (0.01-0.5):1.

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