Bacteriostatic and deodorizing zeolite cat litter and preparation method thereof

Abstract

The application discloses a bacteriostatic and deodorizing zeolite cat litter and a preparation method thereof, and belongs to the technical field of zeolite cat litter preparation. The bacteriostatic and deodorizing zeolite cat litter is composed of the following components in parts by weight: 55-75 parts of modified zeolite, 3-6 parts of bacteriostatic gel, 2-5 parts of adhesive, and 1-3 parts of filler. The modified zeolite is prepared from sulfamic acid, N,N-dimethylformamide, lignocellulose and zeolite, and the bacteriostatic agent is prepared from four-arm polyethylene glycol, succinic anhydride, triethylamine, N-hydroxyl glutarimide, 1-(3-dimethylaminopropyl)-3-ethyl carbodiimide hydrochloride and polylysine. The zeolite cat litter prepared by the method has excellent water absorption, antibacterial property and deodorizing property.

Description

Technical Field

[0001] This invention belongs to the field of zeolite cat litter preparation technology, specifically relating to an antibacterial and deodorizing zeolite cat litter and its preparation method. Background Technology

[0002] With the fast pace of modern life and the rise of pet culture, more and more families are choosing to keep pets, especially cats, who are beloved for their independent and gentle nature. However, raising cats also comes with a series of challenges, one of which is the selection and use of cat litter. Traditional cat litter has many shortcomings in terms of moisture absorption, odor control, and antibacterial properties, making it difficult to keep the litter box dry, clean, and hygienic for a long time, thus affecting the health of cats and the living environment of the home. Against this backdrop, antibacterial and deodorizing zeolite cat litter has emerged and become a new favorite in the pet supplies market. The complex internal structure of zeolite, with its numerous pores, allows it to absorb and trap large amounts of moisture and odor molecules, giving it enormous application potential in the cat litter field.

[0003] Cat litter, as a traditional absorbent material, can effectively absorb cat urine and feces, but its deodorizing and antibacterial effects are limited. The addition of zeolite significantly improves the overall performance of cat litter, not only quickly absorbing and locking in moisture from urine and feces, but also effectively removing odors and harmful substances from the air, providing a healthier and more comfortable environment for cats.

[0004] Patent CN 116711649 A discloses a strong odor-eliminating composite zeolite cat litter and its preparation method. The cat litter is composed of 70-90 parts by weight of activated zeolite, 5-15 parts by weight of bentonite, 3-13 parts by weight of corn flour, and 2 parts by weight of water glass. By using a high content of activated zeolite and large particles, a low content of bentonite, and a combination of corn flour and water glass, the probability and ability to absorb ammonia can be greatly enhanced. It has strong odor elimination and water absorption capabilities. The raw materials of this invention are readily available, have strong odor elimination performance, good water absorption, and good disintegration after agglomeration. However, there is still room for improvement in the antibacterial performance, water absorption performance, and deodorizing performance of the cat litter prepared by this method. Summary of the Invention

[0005] The purpose of this invention is to provide an antibacterial and deodorizing zeolite cat litter and its preparation method, in order to solve the technical problems of poor deodorizing performance, water absorption performance and antibacterial performance of cat litter in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention provides an antibacterial and deodorizing zeolite cat litter, composed of the following components in parts by weight: 55-75 parts modified zeolite, 3-6 parts antibacterial gel, 2-5 parts binder, and 1-3 parts filler. The modified zeolite is prepared from aminosulfonic acid, N,N-dimethylformamide, lignocellulose, and zeolite, and the antibacterial agent is prepared from tetra-arm polyethylene glycol, succinic anhydride, triethylamine, N-hydroxyglutarimide, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and polylysine.

[0008] Preferably, the method for preparing the modified zeolite includes the following steps:

[0009] Q1: Add aminosulfonic acid to a container containing N,N-dimethylformamide, then add lignocellulose to the container, soak, and then place the container in a water bath for reaction. After the reaction is complete, wash, dialyze, freeze dry, and pulverize to obtain modified cellulose powder.

[0010] Q2: Add modified cellulose powder to ultrapure water, disperse it by ultrasonication to obtain a modified cellulose solution, add zeolite to the modified cellulose solution, stir, filter, and dry to obtain modified zeolite.

[0011] In the above process, lignocellulose is used as raw material, and aminosulfonic acid is used to hydrophilically modify it, introducing sulfonate groups to effectively improve the hydrophilicity of the modified cellulose powder. Subsequently, it is mixed with zeolite to obtain modified zeolite. The synthesis reaction formula of the modified cellulose powder is as follows:

[0012]

[0013] Preferably, in Q1, the ratio of aminosulfonic acid, N,N-dimethylformamide, and lignocellulose is (10-20)g:(40-80)mL:(2-4)g, the soaking time is 30-45min, the water bath temperature is 70-80℃, and the time is 1-2h. The cellulose is washed with N,N-dimethylformamide, acetone, and deionized water, respectively, and the particle size of the pulverized modified cellulose powder is 200-300nm.

[0014] Preferably, in Q2, the mass ratio of modified cellulose powder to zeolite is (10-20)g:(200-300)g, the ultrasonic dispersion time is 30-50min, the stirring time is 5-8h, the drying temperature is 70-90℃, and the drying time is 12-14h.

[0015] Preferably, the method for preparing the antibacterial gel includes the following steps:

[0016] S1: The four-arm polyethylene glycol was subjected to vacuum low-pressure dehydration to obtain pretreated four-arm polyethylene glycol, which was added to anhydrous toluene, succinic anhydride and triethylamine were added, and the reaction was heated. After the reaction was completed, the temperature was lowered, the mixture was rotary evaporated under reduced pressure, distilled water was added, filtered, extracted, dried, concentrated by rotary evaporation, and then ice-cold ether was added. The mixture was filtered to obtain crude product 1, which was dissolved and added to ice-cold ether. The mixture was filtered and dried to obtain compound 1.

[0017] S2: Compound 1 was mixed with dichloromethane, N-hydroxyglutarimide was added, and then dichloromethane containing 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride was added dropwise. After stirring and reacting, the mixture was filtered, concentrated by rotary evaporation, and then added to ice-cold ether. The mixture was allowed to stand at low temperature and filtered to obtain crude product 2. The crude product 2 was dissolved, filtered, extracted, dried, filtered, concentrated, added to ice-cold ether, filtered, and dried under vacuum to obtain compound 2.

[0018] S3: Compound 2 and polylysine were added to PBS, stirred and mixed, and then freeze-dried to obtain an antibacterial gel.

[0019] In the above process, compound 1 was first prepared using four-armed polyethylene glycol and succinic anhydride as raw materials. Then, compound 1 was reacted with N-hydroxyglutarimide to obtain compound 2. Compound 2 was further crosslinked with polylysine to obtain an antibacterial gel. The synthesis reaction formula of the antibacterial gel is as follows:

[0020]

[0021] Preferably, in S1, the average molecular weight of the four-arm polyethylene glycol is 10 kDa, the vacuum low-pressure dehydration temperature is 70-80℃, the time is 3-5 h, the ratio of the amount of pretreated four-arm polyethylene glycol, anhydrous toluene, succinic anhydride and triethylamine is (40-80) g : (350-700) mL : (5.5-11) g : (7-14) mL, the heating reaction temperature is 100-110℃, and the time is 24-28 h.

[0022] Preferably, in S2, the ratio of compound 1, N-hydroxyglutarimide, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride is (30-60)g:(2.7-5.4)g:(4.2-8.4)g, the stirring temperature is 20-22℃, the stirring time is 24-28h, and the low-temperature standing temperature is -10~-15℃ for 2-4h.

[0023] Preferably, in step S3, the mass ratio of compound 2 to polylysine is (10-20):(6-12), compound 2 is added to PBS at pH=4, and polylysine is added to PBS at pH=9.

[0024] Preferably, the adhesive is one or more of guar gum, sodium carboxymethyl cellulose and corn starch, and the filler is one or more of montmorillonite, diatomaceous earth, bentonite and sawdust.

[0025] Preferably, the method for preparing the antibacterial and deodorizing zeolite cat litter includes the following steps:

[0026] Step (1): The modified zeolite, antibacterial gel, binder and filler are mixed by mechanical stirring to obtain a mixture;

[0027] Step (2): Add the mixture to the granulator for granulation to obtain granulated cat litter, dry it, and sieve it to obtain antibacterial and deodorizing zeolite cat litter.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] 1. This invention first uses aminosulfonic acid, lignocellulose and zeolite as raw materials to prepare modified zeolite, and then uses tetra-arm polyethylene glycol, succinic anhydride, N-hydroxyglutarimide and polylysine as raw materials to prepare antibacterial gel. Using modified zeolite and antibacterial gel as the main raw materials for cat litter, the prepared cat litter has excellent water absorption, antibacterial and deodorizing properties.

[0030] 2. This invention uses aminosulfonic acid, lignocellulose, and zeolite as raw materials to prepare modified zeolite, which, when used as the main raw material for cat litter, can effectively improve the water absorption and deodorization properties of the cat litter. After modification with aminosulfonic acid, lignocellulose introduces sulfonate groups. Sulfonate groups are strongly polar groups that can form hydrogen bonds with water molecules, thereby enhancing the water absorption of the material. This allows the modified cellulose powder to effectively absorb moisture from urine, reducing liquid residue on the surface of the cat litter. The sulfonate groups also effectively absorb ammonia from urine through a combination of mechanisms, including acid-base reactions, physical adsorption, and the formation of stable compounds, reducing the ammonia content. Furthermore, zeolite is a porous mineral with excellent adsorption properties, capable of adsorbing and fixing odor molecules such as ammonia and hydrogen sulfide. When modified cellulose powder is mixed with zeolite, the two work synergistically, not only enhancing moisture absorption but also significantly improving the deodorization effect. Modified cellulose powder quickly absorbs urine, reducing odor production, while zeolite further adsorbs and fixes these odor molecules, keeping the litter box clean and the air fresh. Moreover, both modified cellulose powder and zeolite have good biodegradability, making them easier to decompose in the natural environment when discarded as waste, reducing environmental pollution.

[0031] 3. This invention uses four-arm polyethylene glycol, succinic anhydride, N-hydroxyglutarimide, and polylysine as raw materials to prepare an antibacterial gel. Polylysine is a natural antimicrobial peptide with broad-spectrum antibacterial activity. Through a cross-linking reaction, the antibacterial properties of polylysine are effectively integrated into the gel network, giving the entire gel system a strong antibacterial ability. When the prepared antibacterial gel is added to cat litter, it can continuously release antibacterial components, effectively inhibiting the growth and reproduction of bacteria in the cat litter. Furthermore, the metabolic products produced by bacterial activity can cause cat litter to clump and harden. By inhibiting bacterial activity, the antibacterial gel prolongs the time the cat litter remains loose, thereby extending its lifespan. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] This embodiment discloses a method for preparing modified zeolite, including the following steps:

[0035] Q1: Add 15g of aminosulfonic acid to a container containing 60mL of N,N-dimethylformamide, then add 3g of lignocellulose to the container and soak for 45min. Then place the container in a 70℃ water bath for 2h. After the reaction is complete, wash with N,N-dimethylformamide, acetone and deionized water respectively, dialyze, freeze dry, and pulverize to a particle size of 200nm to obtain modified cellulose powder.

[0036] Q2: Add 15g of modified cellulose powder to 400mL of ultrapure water and ultrasonically disperse for 50min to obtain a modified cellulose solution. Add 250g of zeolite to the modified cellulose solution, stir for 8h, filter, and dry at 90℃ for 12h to obtain modified zeolite.

[0037] This embodiment discloses a method for preparing an antibacterial gel, including the following steps:

[0038] S1: Four-arm polyethylene glycol with an average molecular weight of 10 kDa was subjected to vacuum dehydration at 80°C for 5 h to obtain pretreated four-arm polyethylene glycol. 60 g of the pretreated four-arm polyethylene glycol was added to 525 mL of anhydrous toluene, along with 8.3 g of succinic anhydride and 10.5 mL of triethylamine. The mixture was heated at 110°C for 24 h. After the reaction was completed, the mixture was cooled, evaporated under reduced pressure, and then distilled water was added. The mixture was filtered, extracted, dried, and concentrated by rotary evaporation. Subsequently, ice-cold ether was added, and the mixture was filtered to obtain crude product 1. After dissolving the crude product, it was added to ice-cold ether, filtered, and dried to obtain compound 1.

[0039] S2: Mix 45g of compound 1 with 450mL of dichloromethane, add 4.05g of N-hydroxyglutarimide, and then add 70mL of dichloromethane containing 6.3g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride. Stir the mixture at 22°C for 24h, filter, concentrate by rotary evaporation, and then add it to ice-cold ether. Let it stand at -10°C for 4h, filter, and obtain crude product 2. Dissolve, filter, extract, dry, filter, concentrate, add to ice-cold ether, filter, and vacuum dry to obtain compound 2.

[0040] S3: Add 15g of compound 2 and 9g of polylysine to 20mL of PBS at pH=4 and pH=9 respectively, stir and mix, freeze dry to obtain antibacterial gel.

[0041] This embodiment discloses an antibacterial and deodorizing zeolite cat litter, which is composed of the following components in parts by weight: 60 parts modified zeolite, 4.5 parts antibacterial gel, 3.5 parts guar gum, and 2 parts diatomaceous earth.

[0042] This embodiment discloses a method for preparing antibacterial and deodorizing zeolite cat litter, including the following steps:

[0043] Step (1): The modified zeolite, antibacterial gel, guar gum and diatomaceous earth are mixed by mechanical stirring to obtain a mixture;

[0044] Step (2): Add the mixture to the granulator for granulation to obtain granulated cat litter, dry it, and sieve it to obtain antibacterial and deodorizing zeolite cat litter.

[0045] Example 2

[0046] This embodiment discloses a method for preparing modified zeolite, including the following steps:

[0047] Q1: Add 10g of aminosulfonic acid to a container containing 40mL of N,N-dimethylformamide, then add 2g of lignocellulose to the container and soak for 45min. Then place the container in a 70℃ water bath for 2h. After the reaction is complete, wash with N,N-dimethylformamide, acetone and deionized water respectively, dialyze, freeze dry, and pulverize to a particle size of 200nm to obtain modified cellulose powder.

[0048] Q2: Add 10g of modified cellulose powder to 400mL of ultrapure water and ultrasonically disperse for 50min to obtain a modified cellulose solution. Add 200g of zeolite to the modified cellulose solution, stir for 8h, filter, and dry at 90℃ for 12h to obtain modified zeolite.

[0049] This embodiment discloses a method for preparing an antibacterial gel, including the following steps:

[0050] S1: Four-arm polyethylene glycol with an average molecular weight of 10 kDa was subjected to vacuum dehydration at 80°C for 5 h to obtain pretreated four-arm polyethylene glycol. 40 g of the pretreated four-arm polyethylene glycol was added to 350 mL of anhydrous toluene, along with 5.5 g of succinic anhydride and 7 mL of triethylamine. The mixture was heated at 110°C for 24 h. After the reaction was completed, the mixture was cooled, evaporated under reduced pressure, and then distilled water was added. The mixture was filtered, extracted, dried, and concentrated by rotary evaporation. Subsequently, ice-cold ether was added, and the mixture was filtered to obtain crude product 1. After dissolving the crude product, it was added to ice-cold ether, filtered, and dried to obtain compound 1.

[0051] S2: Mix 30g of compound 1 with 450mL of dichloromethane, add 2.7g of N-hydroxyglutarimide, and then add 70mL of dichloromethane containing 4.2g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride. After stirring at 22°C for 24h, filter, concentrate by rotary evaporation, and then add to ice-cold ether. Let stand at -10°C for 4h, filter to obtain crude product 2, dissolve, filter, extract, dry, filter, concentrate, add to ice-cold ether, filter, and vacuum dry to obtain compound 2;

[0052] S3: Add 10g of compound 2 and 6g of polylysine to 20mL of PBS at pH=4 and pH=9 respectively, stir and mix, freeze dry to obtain antibacterial gel.

[0053] This embodiment discloses an antibacterial and deodorizing zeolite cat litter, which is composed of the following components in parts by weight: 55 parts modified zeolite, 3 parts antibacterial gel, 2 parts guar gum, and 1 part diatomaceous earth.

[0054] This embodiment discloses a method for preparing antibacterial and deodorizing zeolite cat litter, including the following steps:

[0055] Step (1): The modified zeolite, antibacterial gel, guar gum and diatomaceous earth are mixed by mechanical stirring to obtain a mixture;

[0056] Step (2): Add the mixture to the granulator for granulation to obtain granulated cat litter, dry it, and sieve it to obtain antibacterial and deodorizing zeolite cat litter.

[0057] Example 3

[0058] This embodiment discloses a method for preparing modified zeolite, including the following steps:

[0059] Q1: Add 12g of aminosulfonic acid to a container containing 80mL of N,N-dimethylformamide, then add 4g of lignocellulose to the container and soak for 45min. Then place the container in a 70℃ water bath for 2h. After the reaction is complete, wash with N,N-dimethylformamide, acetone and deionized water respectively, dialyze, freeze dry, and pulverize to a particle size of 200nm to obtain modified cellulose powder.

[0060] Q2: Add 20g of modified cellulose powder to 400mL of ultrapure water and ultrasonically disperse for 50min to obtain a modified cellulose solution. Add 300g of zeolite to the modified cellulose solution, stir for 8h, filter, and dry at 90℃ for 12h to obtain modified zeolite.

[0061] This embodiment discloses a method for preparing an antibacterial gel, including the following steps:

[0062] S1: Four-arm polyethylene glycol with an average molecular weight of 10 kDa was subjected to vacuum dehydration at 80°C for 5 h to obtain pretreated four-arm polyethylene glycol. 80 g of the pretreated four-arm polyethylene glycol was added to 700 mL of anhydrous toluene, along with 11 g of succinic anhydride and 14 mL of triethylamine. The mixture was heated at 110°C for 24 h. After the reaction was completed, the mixture was cooled, evaporated under reduced pressure, and then distilled water was added. The mixture was filtered, extracted, dried, and concentrated by rotary evaporation. Subsequently, ice-cold ether was added, and the mixture was filtered to obtain crude product 1. After dissolving the crude product, it was added to ice-cold ether, filtered, and dried to obtain compound 1.

[0063] S2: 60g of compound 1 was mixed with 450mL of dichloromethane, 5.4g of N-hydroxyglutarimide was added, and then 70mL of dichloromethane containing 8.4g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride was added dropwise. The mixture was stirred at 22℃ for 24h, filtered, concentrated by rotary evaporation, and then added to ice-cold ether. The mixture was allowed to stand at -10℃ for 4h, filtered, and crude product 2 was obtained. The crude product 2 was dissolved, filtered, extracted, dried, filtered, concentrated, added to ice-cold ether, filtered, and dried under vacuum to obtain compound 2.

[0064] S3: Add 20g of compound 2 and 12g of polylysine to 20mL of PBS at pH=4 and pH=9 respectively, stir and mix, freeze dry to obtain antibacterial gel.

[0065] This embodiment discloses an antibacterial and deodorizing zeolite cat litter, which is composed of the following components in parts by weight: 75 parts modified zeolite, 6 parts antibacterial gel, 5 parts guar gum, and 3 parts diatomaceous earth.

[0066] This embodiment discloses a method for preparing antibacterial and deodorizing zeolite cat litter, including the following steps:

[0067] Step (1): The modified zeolite, antibacterial gel, guar gum and diatomaceous earth are mixed by mechanical stirring to obtain a mixture;

[0068] Step (2): Add the mixture to the granulator for granulation to obtain granulated cat litter, dry it, and sieve it to obtain antibacterial and deodorizing zeolite cat litter.

[0069] Example 4

[0070] This embodiment discloses a method for preparing modified zeolite, including the following steps:

[0071] Q1: Add 18g of aminosulfonic acid to a container containing 50mL of N,N-dimethylformamide, then add 2.5g of lignocellulose to the container and soak for 45min. Then place the container in a 70℃ water bath for 2h. After the reaction is complete, wash with N,N-dimethylformamide, acetone and deionized water respectively, dialyze, freeze dry, and pulverize to a particle size of 200nm to obtain modified cellulose powder.

[0072] Q2: Add 18g of modified cellulose powder to 400mL of ultrapure water and ultrasonically disperse for 50min to obtain a modified cellulose solution. Add 220g of zeolite to the modified cellulose solution, stir for 8h, filter, and dry at 90℃ for 12h to obtain modified zeolite.

[0073] This embodiment discloses a method for preparing an antibacterial gel, including the following steps:

[0074] S1: Four-arm polyethylene glycol with an average molecular weight of 10 kDa was subjected to vacuum dehydration at 80°C for 5 h to obtain pretreated four-arm polyethylene glycol. 50 g of the pretreated four-arm polyethylene glycol was added to 400 mL of anhydrous toluene, along with 7.2 g of succinic anhydride and 9 mL of triethylamine. The mixture was heated at 110°C for 24 h. After the reaction was completed, the mixture was cooled, evaporated under reduced pressure, and then distilled water was added. The mixture was filtered, extracted, dried, and concentrated by rotary evaporation. Subsequently, ice-cold ether was added, and the mixture was filtered to obtain crude product 1. After dissolving the crude product, it was added to ice-cold ether, filtered, and dried to obtain compound 1.

[0075] S2: 40g of compound 1 was mixed with 450mL of dichloromethane, 3.2g of N-hydroxyglutarimide was added, and then 70mL of dichloromethane containing 5.1g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride was added dropwise. The mixture was stirred at 22℃ for 24h, filtered, concentrated by rotary evaporation, and then added to ice-cold ether. The mixture was allowed to stand at -10℃ for 4h, filtered, and crude product 2 was obtained. The crude product 2 was dissolved, filtered, extracted, dried, filtered, concentrated, added to ice-cold ether, filtered, and dried under vacuum to obtain compound 2.

[0076] S3: Add 12g of compound 2 and 8g of polylysine to 20mL of PBS at pH=4 and pH=9 respectively, stir and mix, freeze dry to obtain antibacterial gel.

[0077] This embodiment discloses an antibacterial and deodorizing zeolite cat litter, which is composed of the following components in parts by weight: 58 parts modified zeolite, 4 parts antibacterial gel, 3 parts guar gum, and 1.5 parts diatomaceous earth.

[0078] This embodiment discloses a method for preparing antibacterial and deodorizing zeolite cat litter, including the following steps:

[0079] Step (1): The modified zeolite, antibacterial gel, guar gum and diatomaceous earth are mixed by mechanical stirring to obtain a mixture;

[0080] Step (2): Add the mixture to the granulator for granulation to obtain granulated cat litter, dry it, and sieve it to obtain antibacterial and deodorizing zeolite cat litter.

[0081] Example 5

[0082] This embodiment discloses a method for preparing modified zeolite, including the following steps:

[0083] Q1: Add 20g of aminosulfonic acid to a container containing 70mL of N,N-dimethylformamide, then add 3.5g of lignocellulose to the container and soak for 45min. Then place the container in a 70℃ water bath for 2h. After the reaction is complete, wash with N,N-dimethylformamide, acetone and deionized water respectively, dialyze, freeze dry, and pulverize to a particle size of 200nm to obtain modified cellulose powder.

[0084] Q2: Add 12g of modified cellulose powder to 400mL of ultrapure water and ultrasonically disperse for 50min to obtain a modified cellulose solution. Add 280g of zeolite to the modified cellulose solution, stir for 8h, filter, and dry at 90℃ for 12h to obtain modified zeolite.

[0085] This embodiment discloses a method for preparing an antibacterial gel, including the following steps:

[0086] S1: Four-arm polyethylene glycol with an average molecular weight of 10 kDa was subjected to vacuum dehydration at 80 °C for 5 h to obtain pretreated four-arm polyethylene glycol. 70 g of the pretreated four-arm polyethylene glycol was added to 620 mL of anhydrous toluene, along with 10.1 g of succinic anhydride and 11 mL of triethylamine. The mixture was heated at 110 °C for 24 h. After the reaction was completed, the mixture was cooled, evaporated under reduced pressure, and then distilled water was added. The mixture was filtered, extracted, dried, and concentrated by rotary evaporation. Subsequently, ice-cold ether was added, and the mixture was filtered to obtain crude product 1. After dissolving the crude product, it was added to ice-cold ether, filtered, and dried to obtain compound 1.

[0087] S2: Mix 50g of compound 1 with 450mL of dichloromethane, add 4.8g of N-hydroxyglutarimide, and then add 70mL of dichloromethane containing 7.3g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride. Stir the mixture at 22°C for 24h, filter, concentrate by rotary evaporation, and then add to ice-cold ether. Let stand at -10°C for 4h, filter to obtain crude product 2, dissolve, filter, extract, dry, filter, concentrate, add to ice-cold ether, filter, and vacuum dry to obtain compound 2;

[0088] S3: Add 18g of compound 2 and 11g of polylysine to 20mL of PBS at pH=4 and pH=9 respectively, stir and mix, freeze dry to obtain antibacterial gel.

[0089] This embodiment discloses an antibacterial and deodorizing zeolite cat litter, which is composed of the following components in parts by weight: 72 parts modified zeolite, 5 parts antibacterial gel, 4 parts guar gum, and 2.5 parts diatomaceous earth.

[0090] This embodiment discloses a method for preparing antibacterial and deodorizing zeolite cat litter, including the following steps:

[0091] Step (1): The modified zeolite, antibacterial gel, guar gum and diatomaceous earth are mixed by mechanical stirring to obtain a mixture;

[0092] Step (2): Add the mixture to the granulator for granulation to obtain granulated cat litter, dry it, and sieve it to obtain antibacterial and deodorizing zeolite cat litter.

[0093] Comparative Example 1

[0094] Compared with Example 1, Comparative Example 1 did not add aminosulfonic acid during the preparation of modified zeolite, and all other conditions remained unchanged.

[0095] Comparative Example 2

[0096] Compared with Example 1, Comparative Example 2 did not add polylysine during the preparation of the antibacterial gel, while all other conditions remained unchanged.

[0097] Comparative Example 3

[0098] Compared with Example 1, Comparative Example 3 did not modify the zeolite during the preparation of the antibacterial and deodorizing zeolite cat litter, and all other conditions remained unchanged.

[0099] Comparative Example 4

[0100] Compared with Example 1, Comparative Example 4 did not add antibacterial gel during the preparation of antibacterial and deodorizing zeolite cat litter, while all other conditions remained unchanged.

[0101] The samples prepared in Examples 1-5 and Comparative Examples 1-4 were subjected to performance tests. The water absorption rate and deodorization effect of the samples were tested according to T / CIQA 11-2020, and the antibacterial performance of the samples was tested according to the inhibition zone experiment. The test results are shown in Table 1.

[0102] Table 1

[0103]

[0104] As shown in Table 1, the zeolite cat litter prepared in Examples 1-5 of this invention exhibits excellent water absorption, deodorization, and antibacterial properties. A larger diameter of the inhibition zone indicates a superior antibacterial effect. A comparison between Comparative Example 1 and Examples 1-5 shows that adding aminosulfonic acid enhances the water absorption and deodorization of the zeolite cat litter. A comparison between Comparative Example 2 and Examples 1-5 shows that adding polylysine enhances the antibacterial properties of the zeolite cat litter. A comparison between Comparative Example 3 and Examples 1-5 shows that adding modified zeolite enhances the water absorption and deodorization of the zeolite cat litter. A comparison between Comparative Example 4 and Examples 1-5 shows that adding antibacterial gel enhances the antibacterial properties of the zeolite cat litter.

[0105] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0106] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A zeolite cat litter with antibacterial and deodorizing properties, characterized in that, It is composed of the following components in parts by weight: 55-75 parts modified zeolite, 3-6 parts antibacterial gel, 2-5 parts binder, and 1-3 parts filler, wherein the modified zeolite is prepared from aminosulfonic acid, N,N-dimethylformamide, lignocellulose and zeolite, and the antibacterial gel is prepared from tetra-arm polyethylene glycol, succinic anhydride, triethylamine, N-hydroxyglutarimide, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and polylysine; The preparation method of the modified zeolite includes the following steps: Q1: Add aminosulfonic acid to a container containing N,N-dimethylformamide, then add lignocellulose to the container, soak, and then place the container in a water bath for reaction. After the reaction is complete, wash, dialyze, freeze dry, and pulverize to obtain modified cellulose powder. Q2: Add modified cellulose powder to ultrapure water, disperse it ultrasonically to obtain a modified cellulose solution, add zeolite to the modified cellulose solution, stir, filter, and dry to obtain modified zeolite; The method for preparing the antibacterial gel includes the following steps: S1: The four-arm polyethylene glycol was subjected to vacuum low-pressure dehydration to obtain pretreated four-arm polyethylene glycol, which was added to anhydrous toluene, succinic anhydride and triethylamine were added, and the reaction was heated. After the reaction was completed, the temperature was lowered, the mixture was rotary evaporated under reduced pressure, distilled water was added, filtered, extracted, dried, concentrated by rotary evaporation, and then ice-cold ether was added. The mixture was filtered to obtain crude product 1, which was dissolved and added to ice-cold ether. The mixture was filtered and dried to obtain compound 1. S2: Compound 1 was mixed with dichloromethane, N-hydroxyglutarimide was added, and then dichloromethane containing 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride was added dropwise. After stirring and reacting, the mixture was filtered, concentrated by rotary evaporation, and then added to ice-cold ether. The mixture was allowed to stand at low temperature and filtered to obtain crude product 2. The crude product 2 was dissolved, filtered, extracted, dried, filtered, concentrated, added to ice-cold ether, filtered, and dried under vacuum to obtain compound 2. S3: Compound 2 and polylysine were added to PBS, stirred and mixed, and then freeze-dried to obtain an antibacterial gel.

2. The antibacterial and deodorizing zeolite cat litter according to claim 1, characterized in that, In Q1, the ratio of aminosulfonic acid, N,N-dimethylformamide, and lignocellulose is 10-20g:40-80mL:2-4g, the soaking time is 30-45min, the water bath temperature is 70-80℃, and the time is 1-2h. The cellulose is washed with N,N-dimethylformamide, acetone, and deionized water, respectively. The particle size of the pulverized modified cellulose powder is 200-300nm.

3. The antibacterial and deodorizing zeolite cat litter according to claim 1, characterized in that, In Q2, the mass ratio of modified cellulose powder to zeolite is 10-20g: 200-300g, the ultrasonic dispersion time is 30-50min, the stirring time is 5-8h, the drying temperature is 70-90℃, and the drying time is 12-14h.

4. The antibacterial and deodorizing zeolite cat litter according to claim 1, characterized in that, In S1, the average molecular weight of the four-arm polyethylene glycol is 10 kDa, the vacuum low-pressure dehydration temperature is 70-80℃, the time is 3-5 h, the ratio of the amount of pretreated four-arm polyethylene glycol, anhydrous toluene, succinic anhydride and triethylamine is 40-80 g: 350-700 mL: 5.5-11 g: 7-14 mL, the heating reaction temperature is 100-110℃, and the time is 24-28 h.

5. The antibacterial and deodorizing zeolite cat litter according to claim 1, characterized in that, In S2, the ratio of compound 1, N-hydroxyglutarimide, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride is 30-60g: 2.7-5.4g: 4.2-8.4g. The stirring temperature is 20-22℃ for 24-28h, and the low-temperature standing temperature is -10~-15℃ for 2-4h.

6. The antibacterial and deodorizing zeolite cat litter according to claim 1, characterized in that, In step S3, the mass ratio of compound 2 to polylysine is 10-20:6-12. Compound 2 is added to PBS at pH 4, and polylysine is added to PBS at pH 9.

7. The antibacterial and deodorizing zeolite cat litter according to claim 1, characterized in that, The adhesive is one or more of guar gum, sodium carboxymethyl cellulose and corn starch, and the filler is one or more of montmorillonite, diatomaceous earth, bentonite and sawdust.

8. A method for preparing antibacterial and deodorizing zeolite cat litter as described in any one of claims 1-7, characterized in that, Includes the following steps: Step (1): The modified zeolite, antibacterial gel, binder and filler are mixed by mechanical stirring to obtain a mixture; Step (2): Add the mixture to the granulator for granulation to obtain granulated cat litter, dry it, and sieve it to obtain antibacterial and deodorizing zeolite cat litter.

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