Cat litter additive, preparation method and application thereof, cat litter and preparation method thereof

Abstract

The invention provides a cat litter additive, a preparation method and application thereof, cat litter and a preparation method thereof, and relates to the field of pet supplies. The preparation method of the cat litter additive comprises the following steps: sequentially spraying a persulfate solution and a stabilizer solution on inorganic silica gel, and then drying under the conditions of vacuum negative pressure and 15-80 DEG C to obtain the cat litter additive, wherein the concentration of the persulfate solution is 1 wt%-40 wt%. The effective loading capacity of persulfate in the cat litter additive is high, the excellent adsorption performance of the inorganic silica gel and the characteristic that the persulfate decomposes organic matter are combined, odor molecules can be rapidly adsorbed, the odor molecules make contact with the persulfate in pores of the inorganic silica gel to be decomposed, and therefore odor is eliminated, and the situation that odor rebounds is avoided. The cat litter containing the cat litter additive is simple in preparation method, and odor generated by pet excrement can be quickly and stably eliminated.

Description

Technical Field

[0001] The invention relates to the technical field of pet products, and in particular to a cat litter additive and a preparation method and application thereof, and cat litter and a preparation method thereof. Background Art

[0002] When keeping pets, especially when keeping them indoors, the deodorization of pet excrement is a key factor affecting the home environment. The excrement of cats or other animals has a very strong odor. If it is exposed to the air for a long time, due to the decomposition of bacteria, it will produce a stronger and more irritating odor. These odors are emitted into the surrounding environment, making people disgusted and causing physical discomfort.

[0003] Domestic cats often use cat litter to bury their excrement. Ordinary cat litter has a certain adsorption effect on odors, but the adsorption effect is limited. In recent years, cat litters with odor reduction functions have appeared, such as probiotic decomposition, chemical decomposition, etc., but these cat litters either lack stability in deodorization function, such as the effectiveness of probiotic cat litter depends on suitable probiotic survival conditions, or there may be hidden dangers of irritating pets, such as cat litter with specific chemical ingredients added may irritate cats' skin or hair, causing health problems for pets. In addition, there are also functional cat litters on the market that enhance adsorption, such as inorganic silica gel cat litter. Because there are a large number of pores and a large specific surface area inside the inorganic silica gel, it can adsorb odor molecules in the air, but this adsorption is a reversible physical adsorption. Therefore, although inorganic silica gel cat litter has a certain deodorization effect, the odor molecules can be released after being adsorbed on the surface of the inorganic silica gel, and the deodorization effect is not good when used for a long time. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention discloses a cat litter additive and a preparation method and application thereof. The cat litter additive can not only effectively absorb the odor of cat excrement, but also decompose the odor and thus eliminate the odor; by mixing the cat litter additive with other basic cat litters, a cat litter with good deodorizing effect, stable deodorizing performance, and environmental protection and no irritation can be obtained.

[0005] In order to achieve the above technical objectives, on the one hand, the present invention provides a method for preparing a cat litter additive, which comprises spraying a persulfate solution and a stabilizer solution on inorganic silica gel in sequence, and then drying under vacuum negative pressure and 15°C-80°C to obtain the cat litter additive; wherein the concentration of the persulfate solution is 1wt%-40wt%.

[0006] The above technical solution allows the persulfate solution to evenly penetrate into the pores of the inorganic silica gel through a spraying operation, and then combined with the spraying of the stabilizer solution, the persulfate is allowed to enter the pores of the inorganic silica gel more deeply, and the persulfate and the stabilizer are allowed to form a uniform loading layer in the silica gel pores through subsequent drying to obtain the cat litter additive. The present invention explores and experiments and finds that, compared with other commonly used carriers such as activated carbon, diatomaceous earth, and molecular sieves, using inorganic silica gel as a persulfate carrier can obtain a better persulfate loading effect. The cat litter additive of the present invention combines the excellent adsorption performance of inorganic silica gel with the characteristics that persulfate can decompose organic matter, can quickly and stably adsorb odor molecules, and promote the odor molecules to contact and decompose with the persulfate in the pores of the inorganic silica gel, thereby eliminating the odor and preventing the occurrence of odor rebound; in addition, the persulfate contained in the cat litter additive of the present invention is present in the tiny pores of the inorganic silica gel, does not directly contact the pet's skin, and is non-irritating to the pet.

[0007] It is also worth noting that persulfate itself will decompose under heat conditions, and the presence of transition metal ions or contact with organic matter during the cat litter processing will catalyze and accelerate the decomposition of persulfate, resulting in the failure of the cat litter deodorization effect. Based on a large amount of experimental data, the above technical solution uses a spraying method to evenly disperse the persulfate solution and stabilizer solution within a suitable concentration range in the pores of inorganic silica gel, and dry them under vacuum negative pressure and 15℃-80℃, thereby inhibiting the decomposition of persulfate during the drying process and obtaining a cat litter additive with an effective load of persulfate.

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

[0009] Another aspect of the present invention provides a cat litter additive, which is prepared by the preparation method of the cat litter additive.

[0010] Another aspect of the present invention provides the use of the cat litter additive in preparing cat litter.

[0011] Another aspect of the present invention provides a cat litter comprising the above cat litter additive.

[0012] Another aspect of the present invention provides a method for preparing the above cat litter, the method comprising the following steps:

[0013] (1) preparing basic cat litter using raw materials other than the cat litter additive;

[0014] (2) Under normal temperature conditions, the cat litter additive is mixed evenly with the basic cat litter to obtain the cat litter. The method is simple to prepare and can be widely promoted and mass-produced.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention sprays a persulfate solution and a persulfate stabilizer solution of a suitable concentration on the inorganic silica gel in sequence, and obtains a cat litter additive by drying under vacuum negative pressure and suitable temperature conditions. The preparation method is simple to operate and can be scaled up for production. The effective loading amount of persulfate in the cat litter additive of the present invention is high. Combining the excellent adsorption performance of inorganic silica gel and the characteristics of persulfate decomposing organic matter, odor molecules can be quickly adsorbed, and the odor molecules are promoted to contact and decompose with the persulfate in the pores of the inorganic silica gel, thereby eliminating the odor and avoiding the occurrence of odor rebound. The preparation method of the cat litter containing the cat litter additive of the present invention is simple, and the odor generated by pet excrement can be quickly and stably eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the preparation method of the cat litter additive of the present invention. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below, and preferred embodiments of the present invention are given. However, it should be understood that these embodiments are only used for more detailed description and should not be understood as limiting the present invention in any form, i.e., not intended to limit the scope of protection of the present invention.

[0019] Unless otherwise defined, the technical terms used in the following examples have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods, unless otherwise specified, are all conventional methods.

[0020] It should be noted that the inorganic silica gel containing persulfate obtained in the present invention is tested for persulfate content in accordance with the national standard "GB / T 23940-2021 Analysis Method for Industrial Persulfate Products".

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

[0022] On the one hand, the present invention discloses a method for preparing a cat litter additive, which comprises spraying a persulfate solution and a stabilizer solution on inorganic silica gel in sequence, and then drying under vacuum negative pressure and 15° C.-80° C. to obtain the cat litter additive; wherein the concentration of the persulfate solution is 1wt%-40wt%. Figure 1 A schematic diagram showing the persulfate solution penetrating into the voids of the inorganic silica gel and forming a supporting layer after being dried.

[0023] In the above technical scheme, 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%, 40wt%, but it is not limited to the enumerated range, and other unenumerated numerical values ​​in the above numerical range are also applicable to the present invention. In a further example of the present invention, the concentration of the persulfate is explored and optimized. Optionally, the concentration of the persulfate solution is 5wt%-37wt%, and the embodiment of the present invention shows the process of preparing cat litter additives with persulfate of different concentrations.

[0024] In a further example of the present invention, the types of persulfate are explored and optimized. Optionally, the persulfate includes at least one of ammonium persulfate, sodium persulfate, and potassium persulfate. The present embodiment shows 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 enumerated ranges, and other unlisted values ​​within the above numerical ranges are also applicable to the present invention. The embodiment of the present invention shows that when 0.15-0.85 times the mass of the inorganic silica gel is sprayed on the inorganic silica gel and dried under vacuum negative pressure and suitable temperature conditions, a cat litter additive with a persulfate effective load 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 present invention, the concentration of the stabilizer solution is explored. Optionally, the stabilizer solution is an aqueous solution with a mass concentration of 5%-30% of the stabilizer, such as a mass concentration of 5%, 6%, 7%, 8%, 9%, 10%, 13%, 15%, 17%, 20%, 23%, 25%, 27%, 30%, but is not limited to the listed range, and other unlisted values ​​within the above numerical range are also applicable to the present invention.

[0027] In a further example of the present invention, the types of the stabilizer are 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 silicon dioxide 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 not limited to the listed ranges. Other unlisted values ​​within the above numerical ranges are also applicable to the present invention. The optimization of the mass ratio of the stabilizer to the inorganic silica gel is conducive to the formation of a uniform and stable load layer of the stabilizer and the persulfate on the surface of the inorganic silica gel. In an optional example of the present invention, the mass ratio of the stabilizer to the inorganic silica gel is preferably (0.01-0.05):1.

[0029] In a further example of the present invention, the control conditions of the vacuum negative pressure are 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, 35 kPa a, 40kPa, 45kPa, 50kPa, 55kPa, 60kPa, 65kPa, 70kPa, 75kPa, 80kPa, 85kPa, 90kPa, 95kPa, 100kPa, 101kPa, but not limited to the listed ranges, and other unlisted values ​​within the above numerical ranges are also applicable to the present invention; the drying operation is carried out under appropriate vacuum negative pressure conditions to inhibit the decomposition of persulfate during the drying process and improve the drying efficiency; in a further example of the present invention, the vacuum negative pressure is preferably 0.6-20kPa.

[0030] In the above technical solution, the drying temperature can be selected from 15°C, 20°C, 25°C, 30°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C, 80°C, etc., but is not limited to the listed ranges. Other unlisted values ​​within the above numerical ranges are also applicable to the present invention. In a further example of the present invention, the drying temperature is optimized. Optionally, the drying temperature is 15°C-70°C. The embodiments of the present invention and the comparative examples show that the drying operation at a suitable drying temperature can effectively prevent the decomposition of persulfate and obtain a cat litter additive with a persulfate effective load.

[0031] In a further example of the present invention, the types of the inorganic silica gel are 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 a mixture 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 present invention does not limit the morphology of the inorganic silica gel, which can be spherical or blocky, or other irregular shapes. In a further example of the present invention, the size of the inorganic silica gel is 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, 20 mm, but not limited to the listed range. Other unlisted values ​​within the above numerical range are also applicable to the present invention; in the optional example of the present 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 the present 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 an equivalent diameter, that is, the diameter of a spherical particle with the same volume is used to represent the particle size of the inorganic silica gel particle.

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

[0034] It should be noted that the present invention is not limited to the specific operation of promoting uniformity of spraying the persulfate solution and the stabilizer solution on the inorganic silica gel. 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 may select a suitable spraying method as needed, and the scope of protection of the present invention is not limited thereby.

[0035] On the other hand, the present invention provides a cat litter additive, which is prepared by the preparation method of the cat litter additive.

[0036] Further, the persulfate loading in the cat litter additive is 0.9%-20% of the mass of the cat litter additive, such as 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 enumerated range, and other unlisted values ​​within the above numerical range are also applicable to the present invention.

[0037] On the other hand, the cat litter additive of the present invention is used in preparing cat litter.

[0038] In another aspect, the present invention provides a cat litter comprising the cat litter additive.

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

[0040] (1) preparing basic cat litter using raw materials other than the cat litter additive;

[0041] (2) Under normal temperature conditions, the cat litter additive and the basic cat litter are mixed evenly to obtain the cat litter.

[0042] In the actual preparation of cat litter, the basic cat litter can be selected from tofu cat litter, sawdust cat litter, bentonite cat litter or other commercially available cat litters, and those skilled in the art can select according to their needs.

[0043] Furthermore, the mass ratio of the cat litter additive to the basic 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, and other unlisted values ​​within the above numerical range are also applicable to the present invention; in an optional example of the present invention, the mass ratio of the cat litter additive to the basic cat litter is preferably (0.3-0.5):1, and the present invention shows the cat litter preparation process and cat litter deodorization effect with different cat litter additive dosages.

[0044] Example 1

[0045] A preparation method of a cat litter additive, the method comprising: uniformly spraying a 37% mass concentration of ammonium persulfate solution on C-type silica gel, and then spraying a 20% mass concentration of sodium silicate solution; the C-type silica gel is spherical and has a particle size of 3-5 mm; spraying 25 grams of the ammonium persulfate solution per 100 grams of the inorganic silica gel, and the mass ratio of sodium silicate to the inorganic silica gel is 0.03:1; drying at 65°C and 19.8kPa after spraying; weighing after drying for 2 hours, and then weighing again after drying for 1 hour under the same conditions, when the weight difference between the two weighings is less than 2%, it can be considered that it has been fully dried to obtain the cat litter additive. After testing, the load of persulfate in the cat litter additive prepared in this embodiment is 6.3%.

[0046] Example 2

[0047] A preparation method of a cat litter additive, the method comprising: uniformly spraying a 37% mass concentration of ammonium persulfate solution on type A silica gel, and then spraying a 5% mass concentration of trisodium phosphate solution; the type A silica gel is spherical and has a particle size of 3-5 mm; spraying 70 grams of the ammonium persulfate solution per 100 grams of the inorganic silica gel, and the mass ratio of trisodium phosphate to the inorganic silica gel is 0.05:1; drying at 30°C and 3.1 kPa after spraying; weighing after drying for 8 hours, and then weighing again after drying for 1 hour under the same conditions, when the weight difference between the two weighings is less than 2%, it can be considered that it has been fully dried to obtain the cat litter additive. After testing, the load of persulfate in the cat litter additive prepared in this embodiment is 18.7%.

[0048] Example 3

[0049] A preparation method of a cat litter additive, the method comprising: spraying a 36% mass concentration of ammonium persulfate solution evenly on C-type silica gel, and then spraying a 30% mass concentration of sodium silica sol; the C-type silica gel is blocky and has a particle size of 3-20 mm; spraying 80 grams of the ammonium persulfate solution per 100 grams of the inorganic silica gel, and the mass ratio of silicon dioxide in the sodium silica sol to the inorganic silica gel is 0.05:1; drying at room temperature and 0.61 kPa after spraying; weighing after drying for 5 hours, and then weighing again after drying for 1 hour under the same conditions, when the weight difference between the two weighings is less than 2%, it can be considered that it has been fully dried to obtain the cat litter additive. After testing, the load of persulfate in the cat litter additive prepared in this embodiment is 19.5%.

[0050] Example 4

[0051] A method for preparing a cat litter additive, the method comprising: spraying a 5% mass concentration potassium persulfate solution uniformly on C-type silica gel and then spraying a 20% mass concentration acidic silica sol; the C-type silica gel is blocky and has a particle size of 3-20 mm; spraying 80 grams of the potassium persulfate solution per 100 grams of the inorganic silica gel, and the mass ratio of silicon dioxide in the acidic silica sol to the inorganic silica gel is 0.01:1; drying at 70°C and 20.1 kPa after spraying; weighing after drying for 4 hours, and then weighing again after drying for 1 hour under the same conditions, when the weight difference between the two weighings is less than 2%, it can be considered that it has been fully dried to obtain the cat litter additive. After testing, the load of persulfate in the cat litter additive prepared in this embodiment is 3%.

[0052] Example 5

[0053] A preparation method of a cat litter additive, the method comprising: uniformly spraying a sodium persulfate solution with a mass concentration of 36% on a B-type silica gel, and then spraying a sodium silicate solution with a mass concentration of 15%; the B-type silica gel is spherical and has a particle size of 3-5 mm; spraying 15 grams of the sodium persulfate solution per 100 grams of the inorganic silica gel, and the mass ratio of sodium silicate to the inorganic silica gel is 0.01:1; 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, when the weight difference between the two weighings is less than 2%, it can be considered that it has been fully dried to obtain the cat litter additive. After testing, the load of persulfate in the cat litter additive prepared in this embodiment is 4.6%.

[0054] Example 6

[0055] A preparation method of a cat litter additive, the method comprising: uniformly spraying a sodium persulfate solution with a mass concentration of 5% on C-type silica gel, and then spraying a trisodium phosphate solution with a mass concentration of 10%; the C-type silica gel is blocky and has a particle size of 3-20 mm; spraying 85 grams of the sodium persulfate solution per 100 grams of the inorganic silica gel, and the mass ratio of trisodium phosphate to the inorganic silica gel is 0.008:1; drying at 45°C and 5.2kPa after spraying; weighing after drying for 5 hours, and then weighing again after drying for 1 hour under the same conditions, when the weight difference between the two weighings is less than 2%, it can be considered that it has been fully dried to obtain the cat litter additive. After testing, the load of persulfate in the cat litter additive prepared in this embodiment is 3.6%.

[0056] Example 7

[0057] A preparation method of a cat litter additive, the method comprising: uniformly spraying a sodium persulfate solution with a mass concentration of 10% on C-type silica gel, and then spraying a sodium type silica sol with a mass concentration of 20%; the C-type silica gel is spherical and has a particle size of 0.1-2 mm; spraying 70 grams of the sodium persulfate solution per 100 grams of the inorganic silica gel, and the mass ratio of silicon dioxide in the sodium type silica sol to the inorganic silica gel is 0.03:1; drying at 45°C and 8.3kPa after spraying; weighing after drying for 4 hours, and then weighing again after drying for 1 hour under the same conditions, when the weight difference between the two weighings is less than 2%, it can be considered that it has been fully dried to obtain the cat litter additive. After testing, the load of persulfate in the cat litter additive prepared in this embodiment is 4.7%.

[0058] Example 8

[0059] A preparation method of a cat litter additive, the method comprising: spraying a 5% mass concentration potassium persulfate solution uniformly on a B-type silica gel, and then spraying a 30% mass concentration trisodium phosphate solution; the B-type silica gel is spherical and has a particle size of 3-5 mm; spraying 40 grams of the potassium persulfate solution per 100 grams of the inorganic silica gel, and the mass ratio of trisodium phosphate to the inorganic silica gel is 0.001:1; drying at 70°C and 20.1 kPa after spraying; weighing after drying for 3 hours, and then weighing again after drying for 1 hour under the same conditions, when the weight difference between the two weighings is less than 2%, it can be considered that it has been fully dried to obtain the cat litter additive. After testing, the load of persulfate 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, wherein the preparation process of the cat litter additive in this comparative example is the same as the conditions for preparing the cat litter additive shown in Example 2, except that after the ammonium persulfate is sprayed, it is dried at 100° C. and normal pressure. After drying for 12 hours, the inorganic silica gel loaded with ammonium persulfate is still not completely dried.

[0062] Comparative Example 2

[0063] A method for preparing a cat litter additive. The preparation process of the cat litter additive in this comparative example is the same as the conditions for preparing the cat litter additive shown in Example 3, except that after the ammonium persulfate is sprayed, it is dried at 120°C and 91kPa. After drying for 8 hours, it is weighed, and then weighed again after drying for 1 hour under the same conditions. When the weight difference between the two weighings is less than 2%, it can be considered that it has been fully dried to obtain the cat litter additive. After testing, no persulfate loading can be detected in the prepared cat litter additive.

[0064] Comparative Example 3

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

[0066] Comparative Example 4

[0067] A method for preparing a cat litter additive comprises: uniformly spraying a sodium persulfate solution with a mass concentration of 37% on coconut shell activated carbon, the coconut shell activated carbon being in a 1-5 mm block; spraying 50 g of the sodium persulfate solution per 100 g of the 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, and when the weight difference between the two weighings is less than 2%, it can be considered that the cat litter additive has been fully dried, and the cat litter additive is obtained. After testing, no persulfate loading can be detected in the prepared cat litter additive.

[0068] Comparative Example 5

[0069] A method for preparing a cat litter additive comprises: uniformly spraying a sodium persulfate solution with a mass concentration of 22% on diatomaceous earth, the diatomaceous earth being in a block shape of 3-20 mm; spraying 50 g of the sodium persulfate solution per 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, and when the weight difference between the two weighings is less than 2%, it can be considered that the cat litter additive has been fully dried, thereby obtaining the cat litter additive. According to testing, the loading amount of persulfate in the prepared cat litter additive is 0.4%.

[0070] Comparative Example 6

[0071] A method for preparing a cat litter additive comprises: uniformly spraying a sodium persulfate solution with a mass concentration of 36% on a molecular sieve, the molecular sieve being 3-5 mm spherical; spraying 15 g of the sodium persulfate solution per 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, and when the weight difference between the two weighings is less than 2%, it can be considered that the cat litter additive has been fully dried, and the cat litter additive is obtained. After testing, the persulfate loading in the prepared cat litter additive is 0.3%.

[0072] Comparative Example 7

[0073] A method for preparing a cat litter additive, wherein the preparation process of the cat litter additive in this comparative example is the same as the conditions for preparing the cat litter additive shown in Example 3, except that the stabilizer solution is not sprayed in this comparative example. After testing, the loading amount of persulfate in the prepared cat litter additive is 8.6%.

[0074] By combining Examples 1-8 with Comparative Examples 1-3, it can be confirmed that the preparation method of the cat litter additive of the present invention sprays a suitable persulfate solution concentration on inorganic silica gel, and dries under suitable pressure and temperature conditions to obtain inorganic silica gel with effective persulfate loading. Combining Examples 1-8 of the present invention with Comparative Examples 4-6, it can be found that the present invention uses inorganic silica gel as a carrier, and compared with activated carbon, diatomaceous earth or molecular sieve as a carrier for persulfate and stabilizer loading, a cat litter additive with a higher loading amount can be obtained.

[0075] Example 8

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

[0077] Example 9-Example 21: A method for preparing a cat litter is proposed respectively. The method for preparing the cat litter in each example is the same as that in Example 10, except that the mass ratio of the basic cat litter and / or cat litter additive and / or the basic cat litter to the cat litter additive is different. The specific parameters and parameter control ranges are shown in Table 1.

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

[0079] Test Case

[0080] The cat litters prepared in Examples 8 to 21 and the cat litters prepared in Comparative Examples 8 to 19 were used to test the deodorization performance. Specifically, the above cat litters were poured into cat litter boxes of the same specifications, and 9 kg of cat litter was placed in each cat litter box. After the cat litters were laid, 5 cats were given use for 5 days, during which normal feces shoveling and cat litter cleaning were performed but no new cat litter was added. Then, the odor was manually judged.

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

[0082] Table 1

[0083]

[0084]

[0085] It can be verified from the test examples in Table 1 and the comparative test examples that, compared with the comparative cat litter without or directly adding inorganic silica gel, the long-term deodorizing effect of the cat litter containing the embodiment of the present invention is more significant; in addition, compared with the comparative cat litter with direct addition of inorganic silica gel, the amount of inorganic silica gel added to the cat litter of the present invention relative to the basic cat litter is lower, which can achieve the same or better long-term deodorizing effect and has better economic benefits. Combining Test Example 14 with Comparative Test Example 12, it can be verified that the preparation method of the cat litter additive of the present invention sprays a stabilizer on the basis of spraying persulfate on the inorganic silica gel, which can improve the deodorizing effect of the cat litter for long-term use.

[0086] It should be noted that the above contents are further detailed descriptions of the present invention in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple improvements can be made without departing from the concept of the present invention, which should be regarded as falling 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 comprises: spraying a persulfate solution and a stabilizer solution on inorganic silica gel in sequence, and then drying under vacuum negative pressure and 15° C.-80° C. to obtain the cat litter additive; wherein the concentration of the persulfate solution is 1wt%-40wt%.

2. The preparation method of 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, preferably (0.15-0.85):

1.

3. The preparation method of cat litter additive according to claim 1, wherein the stabilizer solution is an aqueous solution with a mass concentration of 5%-30% of the stabilizer; Preferably, 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 silica sol having a silicon dioxide content of 30wt%-40wt%; Preferably, the mass ratio of the stabilizer to the inorganic silica gel is (0.001-0.05):1, preferably (0.01-0.05):

1.

4. The preparation method of 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°C-70°C.

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

6. A cat litter additive, characterized in that: The cat litter additive is prepared by the preparation method of the cat litter additive according to any one of claims 1 to 5.

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

8. Use of the cat litter additive according to claim 6 or 7 in preparing cat litter.

9. Cat litter comprising the cat litter additive according to claim 6 or 7.

10. The method for preparing cat litter according to claim 9, characterized in that: The following steps are involved: (1) preparing basic cat litter using raw materials other than the cat litter additive; (2) at room temperature, the cat litter additive and the basic cat litter are mixed uniformly; Preferably, the mass ratio of the cat litter additive to the basic cat litter is (0.01-0.5):1.

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