Antibacterial deodorizing cat litter and method of making same

Abstract

The application discloses antibacterial and deodorizing cat litter and a preparation method thereof, and steps are as follows: (1) a high-temperature-insensitive polymer waterproof layer is sprayed on the surface of a gas phase purification material to obtain the gas phase purification material with the polymer waterproof layer; the gas phase purification material is active particles loaded with permanganate, and the water content is 5-20 wt%; (2) a wetting agent is sprayed on the surface of the gas phase purification material, then powder is added, and the powder is adhered to the surface of the gas phase purification material through stirring; the spraying of the wetting agent and the adding of the powder are repeated until cat litter particles with a proper size are obtained; (3) the cat litter particles are first dried at low temperature, so that the water content of the outer layer is reduced to below 20 wt%; then the cat litter particles are heated at high temperature to destroy the polymer waterproof layer, and thus the antibacterial and deodorizing cat litter is prepared. The application has excellent antibacterial and deodorizing performance; the 1h contact sterilization rate of staphylococcus aureus and escherichia coli is as high as 99.99% or above; and the removal rate of ammonia gas and hydrogen sulfide and other odors is as high as 90% or above.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of cat litter preparation, and relates to an antibacterial and deodorizing cat litter and a preparation method thereof. BACKGROUND

[0002] Cat litter is a kind of hygroscopic material specially designed for cat excretion, aiming to provide a dry and convenient cleaning environment. Early cat litter is mainly non-coagulated cat litter, such as wood chips, paper pulp particles, silica gel, etc., which simulates sand and provides water absorption to facilitate the storage of cat feces. With the continuous progress of cat litter technology, people are not limited to such simple storage, and bentonite cat litter, tofu cat litter and mixed cat litter have emerged in succession. The water absorption of bentonite cat litter is good, which can completely absorb the water in feces and urine, and then coagulate into a large hard mass, which is convenient and sanitary to clean. The disadvantage of bentonite cat litter is that the dust is relatively large, and a layer of white powder will cover the furniture after a long time, and some cats will cough and sneeze after smelling it. Tofu cat litter uses bean dregs as raw material, which is extruded into a surface without dust, and becomes a paste after soaking in water, which can be directly poured into the toilet and flushed away. With the rise in the price of bean products, the price of bean dregs raw material has also risen, resulting in a much higher price of tofu cat litter than bentonite cat litter. Mixed cat litter is a kind of cat litter made by mixing bentonite cat litter and tofu cat litter in proportion, which combines the advantages of bentonite cat litter and tofu cat litter, and improves the disadvantages of both, becoming the mainstream product in the cat litter market.

[0003] With the continuous improvement of people's living standards, new requirements have been put forward for cat litter products, not only requiring cat litter to be water-absorbing and coagulating, but also requiring cat litter to have antibacterial and deodorizing functions. However, the products on the market still cannot meet people's needs. SUMMARY

[0004] In order to overcome the defects of the prior art, the present application provides a deodorizing cat litter and a preparation method thereof.

[0005] Gas phase purification material is an air purification material for adsorbing and decomposing gaseous pollutants in air. Gas phase purification material not only can adsorb and decompose VOCs such as formaldehyde, toluene and xylene in air, but also can efficiently remove odor gas molecules such as ammonia, hydrogen sulfide and skatole. The combination of gas phase purification material and cat litter can effectively improve the antibacterial and deodorizing performance of cat litter. However, when the outer layer of powder (bean dregs powder and bentonite powder) is rolled, the sprayed aqueous solution enters the gas phase purification material particles, and since the active ingredient of the gas phase purification material, potassium permanganate, is easily soluble in water, the secondary contact of the gas phase purification material with water will cause the dissolution of potassium permanganate, resulting in a significant decrease in the deodorizing performance of the gas phase purification material.

[0006] In order to solve the problem that the performance of the gas phase purification material is significantly reduced due to the contact with water in secondary processing, the application adopts a polymer material spraying process to form a waterproof layer on the surface of the gas phase purification material particles, then the powder is rolled and adhered to the outer layer, the outer layer (soybean dregs and bentonite) reaches the specified water content rate through low-temperature drying, and then the polymer waterproof layer is destroyed through high-temperature heating to make the inner and outer layers connected, so that water absorption and clumping are realized, and the odor in the cat excrement can be adsorbed and decomposed, thereby effectively improving the odor problem caused by the cat going to the toilet.

[0007] The detailed technical solutions of the application are as follows:

[0008] A preparation method of antibacterial and deodorizing cat litter, comprising the following steps:

[0009] (1) spraying a high-temperature-resistant polymer waterproof layer on the surface of the gas phase purification material to obtain the gas phase purification material with the polymer waterproof layer; the gas phase purification material is active particles loaded with permanganate, and the water content rate is 5-20wt%;

[0010] (2) spraying a wetting agent on the surface of the gas phase purification material with the polymer waterproof layer, then adding powder, stirring to make the powder adhere to the surface of the gas phase purification material, and repeating the spraying of the wetting agent and the addition of the powder until cat litter particles of appropriate size are obtained;

[0011] (3) low-temperature drying the cat litter particles first to reduce the water content rate of the outer layer to below 20wt%, and then heating at high temperature to destroy the polymer waterproof layer, thereby obtaining the antibacterial and deodorizing cat litter.

[0012] Preferably, the polymer waterproof layer is poly(t-butyl acrylate) with a thickness of 50-150μm.

[0013] Preferably, the molecular weight of the poly(t-butyl acrylate) is 30±10K.

[0014] Preferably, in step (1), the gas phase purification material is placed in a sugar coating machine, the rotation speed of the sugar coating machine is set to 20±5rpm, the poly(t-butyl acrylate) is heated to melt, and the molten poly(t-butyl acrylate) is sprayed on the rolling gas phase purification material in the sugar coating machine using a spray gun, the spraying time is 20-60s, and the gas phase purification material with the polymer waterproof layer on the surface is obtained.

[0015] Preferably, the wetting agent is an aqueous solution of hyperbranched polylysine and succinic acid.

[0016] Preferably, the wetting agent is an aqueous solution of hyperbranched polylysine and succinic acid with a mass ratio of 5-15:1 and a concentration of 1-10wt%.

[0017] Preferably, in step (3), the water content rate of the outer layer of the cat litter particles is 10±5wt%, and then the cat litter particles are heated by blowing air at 150±10℃ for 10±5min.

[0018] Preferably, in step (1), the gas phase purification material uses activated alumina balls as a carrier with an average particle size of 1.5±0.5mm, and the permanganate is one or two of potassium permanganate and sodium permanganate; in step (2), the powder is one or two of soybean residue powder and bentonite; and the cat litter particles have a particle size of 2-3mm.

[0019] Preferably, the preparation of the gas phase purification material is as follows: first, permanganate is dissolved in water to prepare an aqueous solution with a concentration of 10-20 wt%, then activated alumina balls are soaked in the above aqueous solution. After the activated alumina balls are saturated with adsorption, they are taken out and drained, and finally dried to a moisture content of 5-20 wt%, preferably 10 ± 5 wt%.

[0020] The thickness of the polymer waterproof layer in this invention significantly affects the deodorizing effect of cat litter. If the waterproof layer is too thin, it will not provide waterproofing, and when rolling the outer powder layer, the sprayed aqueous solution will enter the gas-phase purification material particles, damaging them and reducing their deodorizing performance. If the waterproof layer is too thick, although it can protect the gas-phase purification material particles from damage when rolling the outer soybean residue and bentonite, the pores formed after the butene is removed during the subsequent high-temperature attack on the waterproof layer will be blocked by the softening and flow of the polymer, preventing complete destruction of the waterproof layer. This renders the gas-phase purification material ineffective, resulting in a severe decrease in its deodorizing effect.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) This invention combines gas phase purification materials with cat litter, which can effectively improve the antibacterial and deodorizing properties of cat litter. The sterilization rate of Staphylococcus aureus and Escherichia coli after 1 hour of contact is as high as 99.99% or more, and the removal rate of odors such as ammonia and hydrogen sulfide is as high as 90% or more.

[0023] (2) The preparation process of this invention is simple, low in cost, and conducive to industrial production. Attached Figure Description

[0024] Figure 1 This is a photograph of the cat litter granules of the present invention.

[0025] Figure 2 This is a diagram of the core-shell structure of cat litter granules.

[0026] Figure 3 The antibacterial effect of control sample (a) and test sample (b) of Example 1 on Staphylococcus aureus after being cultured at 36℃±1℃ for 48 hours is shown in the figure.

[0027] Figure 4 The antibacterial effect of control sample (a) and test sample (b) of Example 1 on Escherichia coli after being cultured at 36℃±1℃ for 48 hours is shown in the figure. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto. For process parameters not specifically noted, conventional techniques can be referred to.

[0029] 1. Calculation of spraying time for polymer waterproof layer:

[0030] Average volume of a single gas-phase purification material particle:

[0031] R 球 - Average particle radius of the gas phase purification material: 0.75 mm.

[0032] Density of gas phase purification materials:

[0033] V g -Particle pore volume of the gas phase purification material, 0.60cc / g;

[0034] V Al - Alumina volume per unit mass, 0.29 cc / g.

[0035] Average mass of a single gas phase purification material particle: m 球单 =ρ 球 ×V 球单

[0036] Average volume of a single gas phase purification material sprayed with a polymer waterproof layer:

[0037] d 膜 - Thickness of the polymer waterproof layer.

[0038] Total volume of 1000g gas phase purification material granules sprayed with polymer material:

[0039] V 喷 - Atomizing nozzle flow rate, 10cc / s;

[0040] t 喷 -Spraying time for the polymer waterproof layer: 20-60 seconds.

[0041] Substituting the data into the above formula, the thickness of the sprayed polymer waterproof layer is calculated to be approximately 50-150 μm.

[0042] 2. Preparation of gas-phase purification materials:

[0043] The gas-phase purification material uses activated alumina spheres as a carrier and permanganate as the active ingredient. The conventional preparation process of the gas-phase purification material includes three steps: liquid preparation, loading, and drying. First, the permanganate is dissolved in water to prepare a 15 wt% aqueous solution. Then, the activated alumina spheres are immersed in the aqueous solution. After the activated alumina spheres are saturated with adsorption, they are removed and drained. Finally, they are dried to a water content of about 10 wt%.

[0044] Example 1

[0045] 1000g of gas phase purification material with an average particle size of 1.5mm was placed in a sugar coating machine, and the speed of the sugar coating machine was set to 20rpm. Polytert-butyl acrylate with a molecular weight of 30K was heated to 100℃ to melt it, and then sprayed onto the gas phase purification material rolling in the sugar coating machine using a spray gun for 40s, resulting in a gas phase purification material with a polymer waterproof layer on the surface.

[0046] Take 80-100 mesh soybean residue powder and bentonite powder, mix them evenly at a mass ratio of 5:5 to obtain 10 kg of mixed powder. Add hyperbranched polylysine and succinic acid to water at a mass ratio of 10:1 to prepare a 5 wt% aqueous solution, which is the wetting agent.

[0047] A vapor-phase purification material coated with a polymer waterproof layer is placed in a coating machine. A wetting agent is sprayed to moisten the surface of the vapor-phase purification material. Then, a mixture of soybean residue and bentonite powder is added, and the mixture is rolled to adhere to the surface of the vapor-phase purification material. The process of spraying the wetting agent and adding the mixture is repeated until the cat litter granules reach a particle size of 2-3 mm. The resulting cat litter granules are dried at 60°C with forced air for 8 hours until the moisture content drops to 10 wt%. They are then heated at 150°C with forced air for 10 minutes to produce cat litter with a vapor-phase purification material core.

[0048] Referring to QB / T 2761-2006, "Test Method for Purification Effect of Indoor Air Purification Products," 500g of the above-mentioned cat litter sample was placed in a 1.5m... 3 The ammonia purification effect was tested in the test chamber. After 24 hours of static adsorption and decomposition, the ammonia concentration in the test chamber decreased from 2.11 mg / m³. 3 Reduced to 0.19 mg / m³ 3 The ammonia removal rate was 91.0%. Referring to QB / T 2761-2006, "Test Method for Purification Effect of Indoor Air Purification Products," 500g of the above cat litter sample was placed in a 1.5m... 3 The hydrogen sulfide purification effect was tested in the test chamber. After 24 hours of static adsorption and decomposition, the hydrogen sulfide concentration in the test chamber decreased from 1.11 mg / m³. 3 Reduced to 0.08 mg / m³ 3 The hydrogen sulfide removal rate was 92.8%.

[0049] Referring to GB / T 13092-2006, the method for determining the total mold count in feed was used. 1000g of the above-mentioned cat litter sample was crushed and passed through a 0.45mm sieve, then reduced to 250g using the quartering method. 25g of the crushed sample was placed in an Erlenmeyer flask containing 225mL of sterile diluent and shaken on a shaker for 30 minutes to obtain a 1:10 dilution. 10mL of the 1:10 dilution was injected into a test tube containing glass beads and mixed on a micromixer for 3 minutes to disperse the mold spores. 1mL of the dispersed dilution was used to make a 10-fold dilution, and this was repeated 10-fold to create three gradient dilutions. 1mL of each gradient was added to sterile Petri dishes, along with an appropriate amount of high-salt Czapek's medium. The dishes were incubated at 25-28℃±1℃ for one week. The total mold count was determined to be <10 CFU / g. The T / IGIA 015-2023 group standard for mixed cat litter requires that the total number of molds in cat litter be <4000 CFU / g.

[0050] Referring to GB / T 13092-2006, the method for determining the total bacterial count in feed, 1000g of the above-mentioned cat litter sample was crushed and passed through a 0.45mm sieve, then reduced to 250g using the quartering method. 25g of the crushed sample was placed in an Erlenmeyer flask containing 225mL of sterile diluent and shaken on a shaker for 30min to obtain a 1:10 dilution. 1mL of the 1:10 dilution was added to a test tube containing 9mL of diluent and shaken for 30s to prepare a 1:100 dilution. This process was repeated to create three serial dilutions (1mL each) in sterile Petri dishes. Each dish was incubated at 30℃±1℃ for 72h±3h, and the total bacterial count was <90 CFU / g. The T / IGIA015-2023 group standard for mixed cat litter requires a total bacterial count in cat litter of <200,000 CFU / g.

[0051] The antibacterial effect of the above-mentioned cat litter was evaluated according to the evaluation method for antibacterial and bacteriostatic effects in WS / T 650-2019. Fresh 24-hour slant cultures of the test bacteria (Staphylococcus aureus and Escherichia coli) were washed with PBS and diluted to 5×10⁻⁶ with PBS. 6 CFU / mL ~5×10 7CFU / mL, prepare a bacterial suspension for later use. Take 10g of the above cat litter sample, grind the particles into powder using a mortar and pestle, pour into a sterile bottle containing 100mL PBS, shake for 30min, and filter the supernatant to prepare the antibacterial agent for later use. Take a sterile test tube, add 5.0mL of the antibacterial agent, place in a 20℃±1℃ water bath for 5min, then add 0.1mL of the test bacterial suspension, mix quickly and start timing immediately. After 1h of interaction, take 0.5mL of the test bacteria and antibacterial agent mixture and add it to 4.5mL of neutralizing agent, mix well. After each tube of test bacteria and antibacterial agent mixture has been neutralized for 10min, take 1.0mL of sample solution and determine the number of viable bacteria according to the viable bacteria culture counting method. Inoculate two petri dishes with each sample solution. When the number of colonies growing on the plate is high, perform a 10-fold serial dilution with PBS and then perform viable bacteria culture counting. At the same time, use PBS instead of antibacterial agent to perform parallel tests as a positive control. All test and control samples were incubated at 36℃±1℃ for 48 hours, and the final results were observed. See details below. Figure 3 and Figure 4 Experimental results: The bactericidal rate of Staphylococcus aureus was >99.99%, and the bactericidal rate of Escherichia coli was >99.99%.

[0052] Example 2

[0053] 1000g of gas phase purification material with an average particle size of 1.5mm was placed in a sugar coating machine, and the speed of the sugar coating machine was set to 25rpm. 30K molecular weight polytert-butyl acrylate was heated to 100℃ to melt it, and then sprayed onto the gas phase purification material rolling in the sugar coating machine using a spray gun for 20s to obtain a gas phase purification material with a polymer waterproof layer on the surface.

[0054] Take 80-100 mesh soybean residue powder and bentonite powder, mix them evenly at a mass ratio of 3:7 to obtain 10 kg of mixed powder. Add hyperbranched polylysine and succinic acid to water at a mass ratio of 15:1 to prepare a 1 wt% aqueous solution, which is the wetting agent.

[0055] A vapor-phase purification material coated with a polymer waterproof layer is placed in a coating machine. A wetting agent is sprayed to moisten the surface of the vapor-phase purification material. Then, a mixture of soybean residue and bentonite powder is added and rolled to allow the powder to adhere to the surface of the vapor-phase purification material. This process of spraying the wetting agent and adding the powder is repeated until the cat litter granules reach a particle size of 2-3 mm. The resulting cat litter granules are dried at 60°C with forced air for 6 hours until the moisture content drops to 15 wt%. They are then heated at 160°C with forced air for 5 minutes to produce cat litter with a vapor-phase purification material core.

[0056] Referring to QB / T 2761-2006, "Test Method for Purification Effect of Indoor Air Purification Products," 500g of the above-mentioned cat litter sample was placed in a 1.5m... 3The ammonia purification effect was tested in the test chamber. After 24 hours of static adsorption and decomposition, the ammonia concentration in the test chamber decreased from 2.02 mg / m³. 3 Reduced to 0.18 mg / m³ 3 The ammonia removal rate was 91.1%. Referring to QB / T 2761-2006, "Test Method for Purification Effect of Indoor Air Purification Products," 500g of the above cat litter sample was placed in a 1.5m... 3 The hydrogen sulfide purification effect was tested in the test chamber. After 24 hours of static adsorption and decomposition, the hydrogen sulfide concentration in the test chamber decreased from 1.14 mg / m³. 3 Reduced to 0.08 mg / m³ 3 The hydrogen sulfide removal rate was 93.0%.

[0057] Example 3

[0058] 1000g of gas phase purification material with an average particle size of 1.5mm was placed in a sugar coating machine, and the speed of the sugar coating machine was set to 15rpm. Polytert-butyl acrylate with a molecular weight of 30K was heated to 100℃ to melt it, and then sprayed onto the gas phase purification material rolling in the sugar coating machine using a spray gun for 60s, resulting in a gas phase purification material with a polymer waterproof layer on the surface.

[0059] Take 80-100 mesh soybean residue powder and bentonite powder, mix them evenly at a mass ratio of 7:3 to obtain 10 kg of mixed powder. Add hyperbranched polylysine and succinic acid to water at a mass ratio of 5:1 to prepare a 10 wt% aqueous solution, which is the wetting agent.

[0060] A vapor-phase purification material coated with a polymer waterproof layer is placed in a coating machine. A wetting agent is sprayed to moisten the surface of the vapor-phase purification material. Then, a mixture of soybean residue and bentonite powder is added and rolled to allow the powder to adhere to the surface of the vapor-phase purification material. This process of spraying the wetting agent and adding the powder is repeated until the cat litter granules reach a particle size of 2-3 mm. The resulting cat litter granules are dried at 60°C with forced air for 12 hours until the moisture content drops to 5 wt%. They are then heated at 140°C with forced air for 15 minutes to produce cat litter with a vapor-phase purification material core.

[0061] Referring to QB / T 2761-2006, "Test Method for Purification Effect of Indoor Air Purification Products," 500g of the above-mentioned cat litter sample was placed in a 1.5m... 3 The ammonia purification effect was tested in the test chamber. After 24 hours of static adsorption and decomposition, the ammonia concentration in the test chamber decreased from 2.05 mg / m³. 3 Reduced to 0.19 mg / m³ 3 The ammonia removal rate was 90.7%. Referring to QB / T 2761-2006, "Test Method for Purification Effect of Indoor Air Purification Products," 500g of the above cat litter sample was placed in a 1.5m... 3The hydrogen sulfide purification effect was tested in the test chamber. After 24 hours of static adsorption and decomposition, the hydrogen sulfide concentration in the test chamber decreased from 1.02 mg / m³. 3 Reduced to 0.09 mg / m³ 3 The hydrogen sulfide removal rate was 91.2%.

[0062] Example 4

[0063] The difference between this embodiment and Example 1 is that the molecular weight of polytert-butyl acrylate is 20K. Experimental results: Ammonia removal rate was 90.2%, and hydrogen sulfide removal rate was 91.1%.

[0064] Example 5

[0065] The difference between this embodiment and Example 1 is that the molecular weight of polytert-butyl acrylate is 40K. Experimental results: Ammonia removal rate was 90.4%, and hydrogen sulfide removal rate was 90.8%.

[0066] Comparative Example 1 (without added gas phase purification materials)

[0067] Take 80-100 mesh soybean residue powder and bentonite powder, mix them evenly at a mass ratio of 5:5 to obtain 10 kg of mixed powder. Add hyperbranched polylysine and succinic acid to water at a mass ratio of 10:1 to prepare a 5 wt% aqueous solution (wetting agent). Add the soybean residue and bentonite mixed powder to a coating machine, and spray the wetting agent while rolling, so that the mixed powder rolls into balls in the coating machine. Repeat spraying the wetting agent and adding the mixed powder until the cat litter particle size increases to 2-3 mm. The obtained cat litter particles are dried at 60℃ for 8 hours until the moisture content drops to 10 wt%, thus producing cat litter.

[0068] Referring to QB / T 2761-2006, "Test Method for Purification Effect of Indoor Air Purification Products," 500g of the above-mentioned cat litter sample was placed in a 1.5m... 3 The ammonia purification effect was tested in the test chamber. After 24 hours of static adsorption and decomposition, the ammonia concentration in the test chamber decreased from 2.09 mg / m³. 3 Reduced to 1.78 mg / m³ 3 The ammonia removal rate was 14.8%. Referring to QB / T 2761-2006, "Test Method for Purification Effect of Indoor Air Purification Products," 500g of the above cat litter sample was placed in a 1.5m... 3 The hydrogen sulfide purification effect was tested in the test chamber. After 24 hours of static adsorption and decomposition, the hydrogen sulfide concentration in the test chamber decreased from 1.10 mg / m³. 3 Reduced to 0.89 mg / m³ 3 The hydrogen sulfide removal rate was 19.1%. Comparative Example 2 (without polymer waterproofing layer)

[0069] Take 80-100 mesh soybean residue powder and bentonite powder, mix them evenly at a mass ratio of 5:5 to obtain 10 kg of mixed powder. Add hyperbranched polylysine and succinic acid to water at a mass ratio of 10:1 to prepare a 5 wt% aqueous solution (wetting agent). Place 1000 g of gas phase purification material with an average particle size of 1.5 mm into a coating machine, spray the wetting agent to wet the surface of the gas phase purification material, then add the soybean residue and bentonite mixed powder, roll it to make the mixed powder stick to the surface of the gas phase purification material, repeat spraying the wetting agent and adding the mixed powder until the cat litter particle size increases to 2-3 mm. The obtained cat litter particles are dried at 60℃ for 8 hours with a forced air dryer until the moisture content drops to 10 wt%, producing cat litter with a core of gas phase purification material.

[0070] Referring to QB / T 2761-2006, "Test Method for Purification Effect of Indoor Air Purification Products," 500g of the above-mentioned cat litter sample was placed in a 1.5m... 3 The ammonia purification effect was tested in the test chamber. After 24 hours of static adsorption and decomposition, the ammonia concentration in the test chamber decreased from 2.07 mg / m³. 3 Reduced to 1.22 mg / m³ 3 The ammonia removal rate was 41.1%. Referring to QB / T 2761-2006, "Test Method for Purification Effect of Indoor Air Purification Products," 500g of the above cat litter sample was placed in a 1.5m... 3 The hydrogen sulfide purification effect was tested in the test chamber. After 24 hours of static adsorption and decomposition, the hydrogen sulfide concentration in the test chamber decreased from 1.08 mg / m³. 3 Reduced to 0.65 mg / m³ 3 The hydrogen sulfide removal rate was 39.8%. (Comparative Example 3: The polymer waterproofing layer spraying time was too short.)

[0071] 1000g of gas phase purification material with an average particle size of 1.5mm was placed in a coating machine, with the machine speed set to 20rpm. 30K molecular weight polytert-butyl acrylate was heated to 100℃ to melt it, and then sprayed onto the gas phase purification material rotating inside the coating machine using a spray gun for 10 seconds, resulting in a gas phase purification material with a polymer waterproof layer on the surface. 80-100 mesh soybean residue powder and bentonite powder were mixed evenly at a mass ratio of 5:5 to obtain 10kg of mixed powder. Hyperbranched polylysine and succinic acid were added to water at a mass ratio of 10:1 to prepare a 5wt% aqueous solution (wetting agent). The gas phase purification material coated with the polymer waterproof layer was placed in the coating machine, and the wetting agent was sprayed to wet the surface of the gas phase purification material. Then, the soybean residue and bentonite mixed powder was added, and the mixture was rolled to allow the mixed powder to adhere to the surface of the gas phase purification material. The process of spraying the wetting agent and adding the mixed powder was repeated until the cat litter particle size increased to 2-3mm. The resulting cat litter granules were dried at 60°C for 8 hours to reduce the moisture content to 10 wt%, and then heated at 150°C for 10 minutes to produce cat litter with a core of gas-phase purification material.

[0072] Referring to QB / T 2761-2006, "Test Method for Purification Effect of Indoor Air Purification Products," 500g of the above-mentioned cat litter sample was placed in a 1.5m... 3 The ammonia purification effect was tested in the test chamber. After 24 hours of static adsorption and decomposition, the ammonia concentration in the test chamber decreased from 2.06 mg / m³. 3 Reduced to 1.01 mg / m³ 3 The ammonia removal rate was 51.0%. Referring to QB / T 2761-2006, "Test Method for Purification Effect of Indoor Air Purification Products," 500g of the above cat litter sample was placed in a 1.5m... 3 The hydrogen sulfide purification effect was tested in the test chamber. After 24 hours of static adsorption and decomposition, the hydrogen sulfide concentration in the test chamber decreased from 1.07 mg / m³. 3 Reduced to 0.50 mg / m³ 3 The hydrogen sulfide removal rate was 53.3%. (Comparative Example 4: Excessive spraying time for the polymer waterproof layer)

[0073] 1000g of gas-phase purification material with an average particle size of 1.5mm was placed in a coating machine, with the machine speed set to 20rpm. 30K molecular weight polytert-butyl acrylate was heated to 100℃ to melt it, and then sprayed onto the gas-phase purification material rotating inside the coating machine using a spray gun for 120s, resulting in a gas-phase purification material with a polymer waterproof layer on the surface. 80-100 mesh soybean residue powder and bentonite powder were mixed evenly at a mass ratio of 5:5 to obtain 10kg of mixed powder. Hyperbranched polylysine and succinic acid were added to water at a mass ratio of 10:1 to prepare a 5wt% aqueous solution (wetting agent). The gas-phase purification material coated with the polymer waterproof layer was placed in the coating machine, and the wetting agent was sprayed to wet the surface of the gas-phase purification material. Then, the soybean residue and bentonite mixed powder was added, and the mixture was rolled to allow the mixed powder to adhere to the surface of the gas-phase purification material. The process of spraying the wetting agent and adding the mixed powder was repeated until the cat litter particle size increased to 2-3mm. The resulting cat litter granules were dried at 60°C for 8 hours to reduce the moisture content to 10 wt%, and then heated at 150°C for 10 minutes to produce cat litter with a core of gas-phase purification material.

[0074] Referring to QB / T 2761-2006, "Test Method for Purification Effect of Indoor Air Purification Products," 500g of the above-mentioned cat litter sample was placed in a 1.5m... 3 The ammonia purification effect was tested in the test chamber. After 24 hours of static adsorption and decomposition, the ammonia concentration in the test chamber decreased from 2.05 mg / m³. 3 Reduced to 1.88 mg / m³ 3 The ammonia removal rate was 8.3%. Referring to QB / T 2761-2006, "Test Method for Purification Effect of Indoor Air Purification Products," 500g of the above cat litter sample was placed in a 1.5m...3 The hydrogen sulfide purification effect was tested in the test chamber. After 24 hours of static adsorption and decomposition, the hydrogen sulfide concentration in the test chamber decreased from 1.07 mg / m³. 3 Reduced to 0.95 mg / m³ 3 The hydrogen sulfide removal rate was 11.2%.

[0075] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A method of preparing an antibacterial and deodorizing cat litter, characterized by, It comprises the following steps: (1) Spraying a high-temperature-resistant polymer waterproof layer on the surface of the gas purification material to obtain a gas purification material with a polymer waterproof layer; the gas purification material is an active particle loaded with permanganate, and the water content is 5-20wt%; (2) Spraying a wetting agent on the surface of the gas purification material with a polymer waterproof layer, then adding powder, stirring to make the powder stick to the surface of the gas purification material, and repeating the spraying of the wetting agent and the addition of the powder until cat litter particles of appropriate size are obtained; (3) The above cat litter particles are first dried at low temperature to reduce the water content of the outer layer to below 20wt%, and then heated at high temperature to destroy the polymer waterproof layer, thereby obtaining antibacterial and deodorizing cat litter; The polymer waterproof layer is poly(t-butyl acrylate), and the thickness is 50-150μm; Step (1) The gas purification material is placed in a sugar coating machine, the sugar coating machine speed is set to 20±5rpm, the poly(t-butyl acrylate) is heated to melt, and it is sprayed on the rolling gas purification material in the sugar coating machine using a spray gun, the spraying time is 20-60s, and the gas purification material with a polymer waterproof layer on the surface is obtained; Step (1) The gas purification material uses activated alumina balls as a carrier, and the average particle size is 1.5±0.5mm; the permanganate is one or both of potassium permanganate and sodium permanganate; Step (2) The powder is one or both of bean dregs powder and bentonite; the particle size of the cat litter particles is 2-3mm; Step (2) The wetting agent is an aqueous solution of hyperbranched polylysine and succinic acid.

2. The production method according to claim 1, characterized by, The molecular weight of the poly(t-butyl acrylate) is 30±10K.

3. The preparation method according to claim 1, characterized in that, The wetting agent is an aqueous solution of hyperbranched polylysine and succinic acid with a mass ratio of 5-15:1 and a concentration of 1-10wt%.

4. The production method according to claim 1 or 2 or 3, characterized by, Step (3) The water content of the outer layer of the cat litter particles is 10±5wt%, and then it is heated at 150±10℃ for 10±5min.

5. The production method according to claim 1 or 2 or 3, characterized by, The preparation of the gas purification material: first, dissolve the permanganate in water to prepare an aqueous solution with a concentration of 10-20wt%, then immerse the activated alumina balls in the aqueous solution, wait until the activated alumina balls are saturated with adsorption, then take them out and drain, and finally dry to a water content of 5-20wt%.

6. The antibacterial and deodorizing cat litter prepared by the method of any one of claims 1-5.

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