A composite filter material for pet water drinking device and its preparation method and application

Abstract

The present application relates to a composite filter material for pet water drinking device and its preparation method and application, the composite filter material includes filter core base material, functional complex infiltrated in the structure of filter core base material, and slow-release coating coated on the surface of filter core base material;The functional complex includes efficacy agent and sterilizing agent;The efficacy agent includes any one or combination of at least two of urinary mucosa repair agent, skeletal mineral nutrient agent, fur metabolism repair agent;The material used in the slow-release coating includes hydrogenated lecithin and / or single double glycerol fatty acid ester.The composite filter material of the present application uses specific slow-release coating and adds functional complex containing sterilizing agent, combines filtration purification with slow-release release of functional nutritional ingredients, can continuously, quantitatively supplement the required active ingredients in the daily drinking process of pets, effectively improves the health of urinary tract, skeletal mineral nutrition and fur metabolism of pets.

Description

Technical Field

[0001] This invention belongs to the field of pet product technology, and relates to a composite filter material for pet drinking devices, its preparation method, and its application. Background Technology

[0002] With the rapid development of the pet industry, the way dogs and cats are raised has gradually shifted from the traditional free-range or semi-free-range model to a more refined and anthropomorphic management approach, primarily indoors. Pet owners are paying increasing attention to the nutritional health management of their dogs and cats, no longer satisfied with just basic feeding, but focusing more on preventative medicine and daily health maintenance. However, modern pets, especially felines, face a variety of chronic nutrition-related health problems due to their unique physiological characteristics (such as naturally low water intake, strong urine concentration ability, and sensitive metabolic systems) and their long-term reliance on commercial dry food. These problems include lower urinary tract disease (FLUTD), struvite or calcium oxalate stones, obesity, diabetes, and degenerative joint diseases. The occurrence and development of these problems are closely related to factors such as daily water quality, mineral intake balance, and urine pH regulation.

[0003] Currently, most commercially available products for improving the nutritional health of dogs and cats are in the form of nutritional supplements, mainly including tablets, powders, liquid oral solutions, and functional treats. While these products can supplement specific nutrients to some extent, they have the following significant shortcomings in actual use: Poor pet compliance: Dogs and cats (especially cats) have a natural wariness and resistance to forced oral administration or eating food in unusual forms. Tablets often need to be inserted into the throat with a feeding device or by hand, which can easily cause stress, struggle, or even aggression in pets. Even if powder or liquid is mixed into food, pets may refuse to eat due to changes in smell and taste, making it impossible to guarantee an effective intake.

[0004] Heavy workload for pet owners: Existing supplements all require pet owners to administer or mix them into food at the correct time and dosage every day. For busy pet owners or those who need to travel frequently for work, maintaining precise daily feeding is a practical challenge.

[0005] Product stability and safety risks: Liquid supplements are prone to oxidation, microbial contamination, or degradation of active ingredients if they are not refrigerated in time after opening or are exposed to air for a long time; powders and tablets may cause decreased palatability or irritation of the digestive tract due to excessively high local concentrations when mixed with food or water.

[0006] Insufficient duration of action: Most supplements are metabolized quickly in the body. After a single oral dose, the blood concentration or level of active ingredients rises rapidly and then falls rapidly, making it impossible to achieve stable and continuous nutritional intervention.

[0007] Therefore, developing a novel carrier that does not require daily human feeding, is actively accepted by pets, and can continuously and stably release functional components is of great significance for improving the effectiveness of chronic nutritional health management in pets. Summary of the Invention

[0008] To address the shortcomings of existing technologies, the present invention aims to provide a composite filter material for pet drinking devices, its preparation method, and its application.

[0009] To achieve this objective, the present invention employs the following technical solution: In a first aspect, the present invention provides a composite filter material for a pet drinking device, the composite filter material comprising a filter substrate, a functional composite material permeating the structure of the filter substrate, and a slow-release coating covering the surface of the filter substrate. The functional compound includes an efficacy agent and a sterilizing agent; The active ingredients include any one or a combination of at least two of the following: urinary mucosal repair agents, bone mineral nutrients, and skin and fur metabolism repair agents. The materials used in the sustained-release coating include hydrogenated lecithin and / or mono- and diglyceride fatty acid esters.

[0010] This invention creatively designs a composite filter material that uses a specific slow-release coating and adds a functional complex containing a sterilizing agent, combining filtration and purification with the slow release of functional nutrients. When this composite filter material is applied to pet drinking devices, it can continuously supplement the pet's required nutrients during daily drinking, effectively improving the pet's urinary tract health, bone mineral nutrition, and fur metabolism, and has good safety and practicality.

[0011] Preferably, the filter element substrate includes any one or a combination of at least two of high-density fiber rods, polypropylene sintered filter elements, and maifan stone.

[0012] Preferably, the material used for the sustained-release coating is a combination of hydrogenated lecithin and mono- and diglyceride fatty acid esters.

[0013] Preferably, the mass ratio of hydrogenated lecithin to mono- and diglyceride fatty acid esters is 1:(0.5-2) (e.g., 1:0.5, 1:1, 1:1.5, 1:2, etc.).

[0014] Preferably, the sterilizing agent comprises a combination of potassium sorbate and ε-polylysine hydrochloride.

[0015] Preferably, the sterilizing agent further includes a synergistic antibacterial agent, which is a combination of lysozyme, glucose oxidase, and anhydrous glucose.

[0016] In this invention, lysozyme destroys the cell wall, glucose oxidase slowly releases hydrogen peroxide, and food-grade antibacterial agents potassium sorbate and ε-polylysine are used to achieve highly efficient sterilization. The hydrogen peroxide produced by glucose oxidase can activate lysozyme, forming an "enzyme-enzyme synergistic" effect, achieving excellent antibacterial effect at low concentrations. At the same time, by inhibiting the metabolism of odor-producing microorganisms, it decomposes odors such as ammonia and hydrogen sulfide at the source.

[0017] Preferably, the mass ratio of anhydrous glucose, lysozyme, and glucose oxidase is (6-10):(1-4):1 (wherein, the specific values ​​of 6-10 can be 6, 7, 8, 9, 10, etc., and the specific values ​​of 1-4 can be 1, 2, 3, 4, etc.).

[0018] Preferably, the mass ratio of the synergistic antibacterial agent, potassium sorbate, and ε-polylysine hydrochloride is (3-10):1:(0.2-0.5) (wherein, the specific values ​​of 3-10 can be 3, 5, 7, 9, 10, etc., and the specific values ​​of 0.2-0.5 can be 0.2, 0.3, 0.4, 0.5, etc.).

[0019] Preferably, the urinary mucosal repair agent includes β-1,3-D-glucan, N-acetyl-D-glucosamine, taurine, and zinc glycine.

[0020] Preferably, the mass ratio of β-1,3-D-glucan, N-acetyl-D-glucosamine, taurine, and zinc glycine is (5-15):(2-6):1:(0.05-0.3) (wherein, the specific values ​​of 5-15 can be 5, 7, 9, 11, 13, 15, etc., the specific values ​​of 2-6 can be 2, 3, 4, 5, 6, etc., and the specific values ​​of 0.05-0.3 can be 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, etc.).

[0021] Preferably, the mass ratio of the urinary mucosal repair agent to the sterilizing agent is (100-120):1 (for example, it can be 100:1, 105:1, 110:1, 120:1, etc.).

[0022] Preferably, the bone mineral nutrient includes a combination of calcium gluconate, chondroitin sulfate, and vitamin D3.

[0023] Preferably, the mass ratio of calcium gluconate, chondroitin sulfate, and vitamin D3 is (50-100):(20-80):(0.0005-0.005) (wherein, the specific values ​​of 50-100 can be 50, 60, 70, 80, 100, etc.; the specific values ​​of 20-80 can be 20, 40, 60, 80, etc.; and the specific values ​​of 0.0005-0.005 can be 0.0005, 0.001, 0.002, 0.003, 0.004, 0.005, etc.).

[0024] Preferably, the mass ratio of the bone mineral nutrient to the sterilizing agent is (80-100):1 (for example, it can be 80:1, 85:1, 90:1, 95:1, 100:1, etc.).

[0025] Preferably, the fur metabolism repair agent comprises a combination of nicotinamide, L-cysteine, D-calcium pantothenate, zinc glycine, and biotin.

[0026] Preferably, the mass ratio of nicotinamide:L-cysteine:D-calcium pantothenate:biotin:zinc glycine is (20-50):(10-15):(10-12):(1-1.25):1 (wherein, the specific values ​​of 20-50 can be 20, 30, 40, 50, etc., the specific values ​​of 10-15 can be 10, 11, 12, 13, 14, 15, etc., and the specific values ​​of 1-1.25 can be 1, 1.1, 1.2, 1.25, etc.).

[0027] Preferably, the mass ratio of the fur metabolism repair agent to the sterilizing agent is (95-110):1 (for example, it can be 95:1, 100:1, 105:1, 110:1, etc.).

[0028] In a second aspect, the present invention provides a method for preparing the composite filter material as described in the first aspect, the method comprising: (1) Mix the functional complex with water to obtain a functional aqueous solution for later use; (2) The filter element substrate is placed in a vacuum impregnation device. After the gas in the porous structure of the filter element substrate is discharged, the filter element substrate is mixed with a functional aqueous solution. After mixing, it is dried to obtain a filter element substrate carrying a functional compound. (3) The filter element substrate carrying the functional composite is mixed with the molten slow-release coating material, and then cured to obtain the composite filter element material.

[0029] Preferably, the mixing temperature in step (1) is 40-50°C (e.g., 40°C, 42°C, 44°C, 46°C, 48°C, 50°C, etc.).

[0030] Preferably, the mass concentration of the functional aqueous solution in step (1) is 15-35% (e.g., it can be 15%, 20%, 25%, 30%, 35%, etc.).

[0031] Preferably, when the gas is discharged from the porous structure of the filter element substrate in step (2), the pressure is -0.10 MPa to -0.08 MPa (e.g., -0.10 MPa, -0.09 MPa, -0.08 MPa, etc.), the temperature is 20-30℃ (e.g., 20℃, 22℃, 24℃, 26℃, 28℃, 30℃, etc.), and the time is 10-30 min (e.g., 10 min, 15 min, 20 min, 25 min, 30 min, etc.).

[0032] Preferably, the mixing pressure in step (2) is 0.05-0.1 MPa (e.g., 0.05 MPa, 0.06 MPa, 0.07 MPa, 0.08 MPa, 0.1 MPa, etc.), the temperature is 20-30℃ (e.g., 20℃, 22℃, 24℃, 26℃, 28℃, 30℃, etc.), and the time is 10-20 min (e.g., 10 min, 12 min, 14 min, 16 min, 18 min, 20 min, etc.).

[0033] Preferably, the drying in step (2) is freeze drying.

[0034] Preferably, the mixing temperature in step (3) is 20-30℃ (e.g., 20℃, 22℃, 24℃, 26℃, 28℃, 30℃, etc.), and the time is 3-5 s (e.g., 3 s, 4 s, 5 s, etc.).

[0035] Preferably, the curing method in step (3) is to stand at 20-30℃ (for example, 20℃, 22℃, 24℃, 26℃, 28℃, 30℃, etc.) for 5-20 minutes (for example, 5 minutes, 10 minutes, 15 minutes, 20 minutes, etc.).

[0036] Preferably, the mixing and curing steps in step (3) are repeated 1-3 times (e.g., once, twice, three times, etc.).

[0037] All other specific point values ​​not listed above within the numerical ranges mentioned above can be selected and are all within the protection scope of this invention. For the sake of brevity, they will not be described in detail here.

[0038] Thirdly, the present invention provides the application of the composite filter material as described in the first aspect in the preparation of pet drinking devices.

[0039] Compared with the prior art, the present invention has the following beneficial effects: This invention creatively designs a composite filter material that uses a specific slow-release coating and adds a functional complex containing a sterilizing agent, combining filtration and purification with the slow release of functional nutrients. When this composite filter material is applied to pet drinking devices, it can continuously replenish the required active ingredients during the pet's daily drinking process, effectively improving the pet's urinary tract health, bone mineral nutrition, and fur metabolism, and has good safety and practicality. Detailed Implementation

[0040] To further illustrate the technical means and effects of the present invention, the following describes the technical solution of the present invention in conjunction with preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.

[0041] The ε-polylysine hydrochloride used in this invention was purchased from Shanghai Baisifu Food Development Co., Ltd.; the mono- and diglyceride fatty acid esters were purchased from Anhui Anrui Biotechnology Co., Ltd.; the lysozyme was purchased from Xi'an Zhongyan Kangze Biotechnology Co., Ltd.; and the glucose oxidase was purchased from Anhui Anrui Biotechnology Co., Ltd.

[0042] Example 1 This embodiment provides a composite filter material, the preparation method of which is as follows: Urinary mucosal repair agent: a combination of β-1,3-D-glucan, N-acetyl-D-glucosamine, taurine, and zinc glycine in a mass ratio of 10:5:1:0.2; Sterilizing agent: a combination of synergistic antibacterial agent, potassium sorbate, and ε-polylysine hydrochloride in a mass ratio of 10:1:0.4, wherein the synergistic antibacterial agent is anhydrous glucose, lysozyme, and glucose oxidase in a mass ratio of 7:2:1; Slow-release coating: a combination of hydrogenated lecithin and mono- and diglyceride fatty acid esters in a 1:1 mass ratio.

[0043] (1) Mix the urinary mucosal repair agent and sterilizing agent in a mass ratio of 120:1, add water to the mixture to a mass concentration of 20%, and stir at 50°C until completely dissolved to obtain a mixed solution; (2) Using polypropylene sintered filter element as filter element substrate, place it in a vacuum impregnation device to completely immerse the filter element substrate in the mixed solution, evacuate to a pressure of -0.1 MPa, maintain at 25°C for 20 min, remove the gas from the porous structure of the filter element substrate, then restore the pressure to 0.08 MPa, maintain at 25°C for 15 min; take out the impregnated filter element substrate, pre-freeze at -55°C for 8 h, freeze-dry at -5°C for 25 h to obtain the filter element substrate carrying the functional composition; (3) Heat the slow-release coating material to 80°C to melt it completely, then vertically immerse the filter element substrate carrying the functional composite into the molten slow-release coating material, keep it for 4 seconds and then pull it out at a uniform speed, let it stand and solidify at 25°C, and repeat the immersion coating twice to obtain the composite filter element material.

[0044] Example 2 This embodiment provides a composite filter material, the preparation method of which is as follows: Bone mineral nutrients: a combination of calcium gluconate, chondroitin sulfate, and vitamin D3 in a mass ratio of 80:50:0.002; Sterilizing agent: a combination of synergistic antibacterial agent, potassium sorbate, and ε-polylysine hydrochloride in a mass ratio of 5:1:0.5, wherein the synergistic antibacterial agent is anhydrous glucose, lysozyme, and glucose oxidase in a mass ratio of 6:3:1; Slow-release coating: a combination of hydrogenated lecithin and mono- and diglyceride fatty acid esters in a mass ratio of 1:1.5.

[0045] (1) Mix bone mineral nutrients and sterilizing agent in a mass ratio of 90:1, add water to the mixture to a mass concentration of 25%, and stir at 45°C until completely dissolved to obtain a mixed solution; (2) Using maifan stone as the filter element substrate, place it in a vacuum impregnation device to completely immerse the filter element substrate in the mixed solution, evacuate to a pressure of -0.08 MPa, maintain at 25°C for 20 min, remove the gas from the porous structure of the filter element substrate, then restore the pressure to 0.08 MPa, maintain at 25°C for 20 min; take out the impregnated filter element substrate, pre-freeze at -55°C for 8 h, freeze-dry at -5°C for 25 h to obtain the filter element substrate carrying the functional composition; (3) Heat the slow-release coating material to 80°C to melt it completely, then vertically immerse the filter element substrate carrying the functional composite into the molten slow-release coating material, keep it for 4 seconds and then pull it out at a uniform speed, let it stand at 25°C to solidify, and repeat the immersion coating 3 times to obtain the composite filter element material.

[0046] Example 3 This embodiment provides a composite filter material, the preparation method of which is as follows: Skin and fur metabolism repair agent: a combination of nicotinamide, L-cysteine, D-calcium pantothenate, biotin, and zinc glycine in a mass ratio of 30:10:12:1.2:1; Sterilizing agent: a combination of synergistic antibacterial agent, potassium sorbate, and ε-polylysine hydrochloride in a mass ratio of 4:1:0.2, wherein the synergistic antibacterial agent is anhydrous glucose, lysozyme, and glucose oxidase in a mass ratio of 6:1:1; Slow-release coating: a combination of hydrogenated lecithin and mono- and diglyceride fatty acid esters in a mass ratio of 1:0.5.

[0047] (1) Mix fur metabolism repair agent and sterilizing agent in a mass ratio of 100:1, add water to the mixture to a mass concentration of 20%, and stir at 50°C until completely dissolved to obtain a mixed solution; (2) Using polypropylene sintered filter element as filter element substrate, place it in a vacuum impregnation device to completely immerse the filter element substrate in the mixed solution, evacuate to a pressure of -0.1 MPa, maintain at 25°C for 25 min, remove the gas from the porous structure of the filter element substrate, then restore the pressure to 0.08 MPa, maintain at 25°C for 15 min; take out the impregnated filter element substrate, pre-freeze at -55°C for 8 h, freeze-dry at -5°C for 25 h to obtain the filter element substrate carrying the functional composition; (3) Heat the slow-release coating material to 80°C to melt it completely, then vertically immerse the filter element substrate carrying the functional composite into the molten slow-release coating material, keep it for 3 seconds and then pull it out at a uniform speed, let it stand and solidify at 25°C, and repeat the immersion coating twice to obtain the composite filter element material.

[0048] Example 4 This embodiment provides a composite filter material. The only difference between this material and the preparation method in Example 1 is that hydrogenated lecithin is not added to the slow-release coating. Instead, the reduced mass of hydrogenated lecithin is entirely allocated to mono- and diglyceride fatty acid esters. All other conditions remain unchanged.

[0049] Example 5 This embodiment provides a composite filter material. The only difference between the preparation method and that of Embodiment 1 is that no mono- or diglyceride fatty acid esters are added to the slow-release coating. Instead, the reduced mass of mono- and diglyceride fatty acid esters is allocated to hydrogenated lecithin. All other conditions remain unchanged.

[0050] Example 6 This embodiment provides a composite filter material. The only difference between the preparation method and that of Example 1 is that potassium sorbate is not added to the sterilizing agent, and the reduced mass of potassium sorbate is proportionally allocated to ε-polylysine hydrochloride and the synergistic antibacterial agent. All other conditions remain unchanged.

[0051] Example 7 This embodiment provides a composite filter material. The only difference between the preparation method and that of Example 1 is that ε-polylysine hydrochloride is not added to the sterilizing agent, and the reduced mass of ε-polylysine hydrochloride is proportionally allocated to potassium sorbate and the synergistic antibacterial agent. All other conditions remain unchanged.

[0052] Example 8 This embodiment provides a composite filter material. The only difference between the preparation method and that of Example 1 is that no synergistic antibacterial agent is added to the sterilizing agent. Instead, the mass reduction of the synergistic antibacterial agent is proportionally allocated to potassium sorbate and ε-polylysine hydrochloride, while all other conditions remain unchanged.

[0053] Example 9 This embodiment provides a composite filter material. The only difference between this material and the preparation method in Example 1 is that anhydrous glucose is not added to the sterilizing agent, and the reduced mass of anhydrous glucose is proportionally allocated to lysozyme and glucose oxidase. All other conditions remain unchanged.

[0054] Example 10 This embodiment provides a composite filter material. The only difference between the preparation method and that of Example 1 is that lysozyme is not added to the sterilizing agent, and the reduced mass of lysozyme is proportionally allocated to anhydrous glucose and glucose oxidase. All other conditions remain unchanged.

[0055] Example 11 This embodiment provides a composite filter material. The only difference between the preparation method and that of Example 1 is that glucose oxidase is not added to the sterilizing agent, and the reduced mass of glucose oxidase is proportionally allocated to anhydrous glucose and lysozyme. All other conditions remain unchanged.

[0056] Example 12 This embodiment provides a composite filter material. The difference between the preparation method and that of Embodiment 1 is that step (2) is: Using polypropylene sintered filter cartridges as filter cartridge substrates, the mixed solution was completely immersed in the filter cartridge substrates at 25°C for 35 min; the immersed filter cartridge substrates were then removed and dried in an oven at 45°C for 6 h until the moisture content was less than 5%, thus obtaining filter cartridge substrates carrying the functional composition. With all other conditions remaining unchanged, the composite filter material is obtained.

[0057] Comparative Example 1 This comparative example provides a composite filter material, and the preparation method is as follows: Slow-release coating: a combination of hydrogenated lecithin and mono- and diglyceride fatty acid esters in a 1:1 mass ratio.

[0058] Using a sintered polypropylene filter element as the filter element substrate, the slow-release coating material is heated to 80°C to completely melt it. The filter element substrate is then vertically immersed into the molten slow-release coating material, held for 4 seconds, and then uniformly removed. It is then allowed to stand and solidify at 25°C, and the immersion coating is repeated twice to obtain the composite filter element material.

[0059] Test Example 1 This test example examines the sustained-release performance of the composite filter materials from Examples 1-12.

[0060] The composite filter materials from Examples 1-12 were connected to the purified water pipeline of the automatic pet water fountain, with the flow rate controlled at 350 mL / min. The automatic pet water fountain took approximately 60 seconds per day to refill, and three parallel control groups were set up for each group.

[0061] At days 1, 10, 20, and 30 after inoculation, all filtrates (approximately 350 mL) were collected as test samples for that time point. These samples were filtered through a 0.22 μm microporous membrane and then aliquoted for storage. The effective components of each sample were quantitatively detected using liquid chromatography-mass spectrometry (LC-MS) (standard curves for each component were pre-established), including mineral elements (such as Ca). 2+ The ICP-OES method was used for detection.

[0062] In Examples 1 and 4-12, the main detected component was taurine; in Example 2, the main detected component was calcium gluconate (calcium ions); and in Example 3, the main detected component was nicotinamide.

[0063] Calculate the daily release percentage at each time point using the following formula: Daily release (mg) = concentration × sampling volume Daily release percentage (%) = Daily release volume / Theoretical total load capacity × 100% The release results of each group of samples were measured three times and the average value was taken. The results were rounded to one decimal place. The daily release percentage results are shown in Table 1. The results showed that the composite filter material prepared by this invention achieved excellent sustained-release of active ingredients after being connected to a pure water pipeline, maintaining a relatively high daily release rate even after 30 days. Changing the formulation of the sustained-release coating reduced the sustained-release effect, with the active ingredients exhibiting a noticeable burst release in the initial stage. Changing the formulation of the sterilizing agent also reduced the sustained-release effect, with a significant decrease in release rate after 30 days. This indicates that the specific use of the sterilizing agent in this invention is crucial; the absence of any one of them leads to a significant decrease in effectiveness. Failure to vacuum impregnate the filter substrate during the preparation process also reduced the effectiveness.

[0064] Test Example 2 This test case examines the antibacterial safety of the composite filter materials used in Examples 1-12 and Comparative Example 1.

[0065] Each group of composite filter materials was installed on a pet water fountain and used continuously for 30 days. Three parallel control groups were set up for each group.

[0066] The filtrate was collected on days 1 and 30, and the total bacterial count was tested according to GB / T 5750.12-2023 "Standard Test Methods for Microbiological Indicators of Drinking Water". The plate counting method specified in the standard was used for the determination, and the test results were calculated. Each group of samples was tested three times, and the average value was taken (results were retained to integer places).

[0067] The test results are shown in Table 2. The results showed that the composite filter material designed in this invention still had a good antibacterial effect after 30 days of continuous use. Compared with this invention, changing the formulation of the sterilizing agent or omitting the sterilizing agent in this invention would lead to a significant decrease in the antibacterial effect; changing the formulation of the slow-release coating would also lead to a decrease in the effect.

[0068] The applicant declares that the technical solution of this invention is illustrated by the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials for the products of this invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

[0069] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0070] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. A composite filter material for pet drinking devices, characterized in that, The composite filter material includes a filter substrate, a functional composite material permeating the structure of the filter substrate, and a slow-release coating covering the surface of the filter substrate. The functional compound includes an efficacy agent and a sterilizing agent; The active ingredients include any one or a combination of at least two of the following: urinary mucosal repair agents, bone mineral nutrients, and skin and fur metabolism repair agents. The materials used in the sustained-release coating include hydrogenated lecithin and / or mono- and diglyceride fatty acid esters.

2. The composite filter material according to claim 1, characterized in that, The filter element substrate includes any one or a combination of at least two of the following: high-density fiber rods, polypropylene sintered filter elements, and maifan stone. Preferably, the material used for the sustained-release coating is a combination of hydrogenated lecithin and mono- and diglyceride fatty acid esters; Preferably, the mass ratio of hydrogenated lecithin to mono- and diglyceride fatty acid esters is 1:(0.5-2).

3. The composite filter material according to claim 1 or 2, characterized in that, The sterilizing agent comprises a combination of potassium sorbate and ε-polylysine hydrochloride; Preferably, the sterilizing agent further includes a synergistic antibacterial agent, which is a combination of lysozyme, glucose oxidase, and anhydrous glucose. Preferably, the mass ratio of the anhydrous glucose, lysozyme, and glucose oxidase is (6-10):(1-4):1; Preferably, the mass ratio of the synergistic antibacterial agent, potassium sorbate, and ε-polylysine hydrochloride is (3-10):1:(0.2-0.5).

4. The composite filter material according to any one of claims 1-3, characterized in that, The urinary mucosal repair agent comprises a combination of β-1,3-D-glucan, N-acetyl-D-glucosamine, taurine, and zinc glycine. Preferably, the mass ratio of β-1,3-D-glucan, N-acetyl-D-glucosamine, taurine, and zinc glycine is (5-15):(2-6):1:(0.05-0.3). Preferably, the mass ratio of the urinary mucosal repair agent to the sterilizing agent is (100-120):

1.

5. The composite filter material according to any one of claims 1-4, characterized in that, The bone mineral nutrient includes a combination of calcium gluconate, chondroitin sulfate, and vitamin D3. Preferably, the mass ratio of calcium gluconate, chondroitin sulfate, and vitamin D3 is (50-100):(20-80):(0.0005-0.005). Preferably, the mass ratio of the bone mineral nutrient to the sterilizing agent is (80-100):

1.

6. The composite filter material according to any one of claims 1-5, characterized in that, The fur metabolism repair agent includes a combination of nicotinamide, L-cysteine, D-calcium pantothenate, zinc glycine, and biotin. Preferably, the mass ratio of nicotinamide, L-cysteine, D-calcium pantothenate, biotin, and zinc glycine is (20-50):(10-15):(10-12):(1-1.25):1; Preferably, the mass ratio of the fur metabolism repair agent to the sterilizing agent is (95-110):

1.

7. The method for preparing the composite filter material according to any one of claims 1-6, characterized in that, The preparation method includes: (1) Mix the functional complex with water to obtain a functional aqueous solution for later use; (2) The filter element substrate is placed in a vacuum impregnation device. After the gas in the porous structure of the filter element substrate is discharged, the filter element substrate is mixed with a functional aqueous solution. After mixing, it is dried to obtain a filter element substrate carrying a functional compound. (3) The filter element substrate carrying the functional composite is mixed with the molten slow-release coating material, and then cured to obtain the composite filter element material.

8. The preparation method according to claim 7, characterized in that, The mixing temperature in step (1) is 40-50℃; Preferably, the mass concentration of the functional aqueous solution in step (1) is 15-35%; Preferably, in step (2), when the gas is discharged from the porous structure of the filter substrate, the pressure is -0.10 MPa to -0.08 MPa, the temperature is 20-30℃, and the time is 10-30 min. Preferably, the mixing pressure in step (2) is 0.05-0.1 MPa, the temperature is 20-30℃, and the time is 10-20 min; Preferably, the drying in step (2) is freeze drying.

9. The preparation method according to claim 7 or 8, characterized in that, The mixing temperature in step (3) is 20-30℃, and the mixing time is 3-5 s; Preferably, the curing method in step (3) is to let it stand at 20-30℃ for 5-20 min; Preferably, the mixing and curing steps in step (3) are repeated 1-3 times.

10. The application of the composite filter material according to any one of claims 1-6 in the preparation of pet drinking devices.

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