Plant fiber bacteriostatic cat litter containing nanoparticles and preparation method thereof

Abstract

The invention provides plant fiber bacteriostatic cat litter containing nanoparticles and a preparation method thereof, and relates to the field of cat litter. The plant fiber bacteriostatic cat litter containing the nanoparticles is prepared from the following raw materials: natural plant fibers, corn starch, mountain flour, corn flour, pregelatinized starch, guar gum, the nanoparticles, natural plant essence and biological polymerase. The nano-particles are composed of nano-zinc, nano-silver and nano-copper with the average particle size of 3-5 nm. According to the plant fiber antibacterial cat litter containing the nano particles and the preparation method thereof, the technical problems that an existing plant fiber antibacterial cat litter is single in antibacterial spectrum, poor in stability and the like are effectively solved, efficient broad-spectrum antibacterial performance can be achieved, and meanwhile the deodorization performance and the caking performance of the plant fiber cat litter are further improved; in addition, the adopted nano particles can replace traditional chemical additives, and the anti-corrosion and anti-oxidation effects are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cat litter, in particular to a plant fiber antibacterial cat litter containing nanoparticles and a preparation method thereof. BACKGROUND

[0002] Plant fiber cat litter is usually made of natural plant fibers (such as cassava, corn, bean dregs, pine, bamboo fiber, and sugar cane residue) as the main raw material, through physical processing processes such as crushing, molding, and drying. Pet owners use cat litter to bury the feces and urine of their cats, which usually has good water absorption, clumping, and water-soluble properties.

[0003] Existing plant fiber cat litter is usually made of pea fiber, cassava fiber, corn starch, binders, fillers, and antibacterial agents. Cat litter with antibacterial function also contains additional antibacterial components such as silver antibacterial agents, natural antibacterial agents (bamboo vinegar, etc.), chemical antibacterial agents (benzalkonium chloride, polyhexamethylene biguanide), antibacterial metal salts or oxides, etc., to give the cat litter antibacterial function.

[0004] However, the existing plant fiber antibacterial cat litter uses silver bactericides and natural antibacterial agents with single antibacterial spectrum, which is only effective against gram-negative bacteria, and has limited antibacterial effect on mold and fungi. The chemical antibacterial agents also have the problems of insufficient broad-spectrum and poor durability, and have mucous membrane toxicity, which can cause cat corneal edema. The antibacterial metal salts or oxides have poor bonding properties with other cat litter raw materials, are greatly affected by environmental factors, have poor overall stability, and have unsatisfactory antibacterial performance. At the same time, they also have the problem of single antibacterial spectrum. The hygroscopicity of plant fiber cat litter and the residual sugar content of its raw materials promote the growth of mold, and cannot achieve effective broad-spectrum antibacterial effect. Furthermore, the antibacterial components used in existing plant fiber cat litter cannot effectively achieve deodorization, and the deodorization and clumping properties of cat litter need to be further improved. SUMMARY

[0005] To solve the technical problems in the prior art, the present application provides a plant fiber antibacterial cat litter containing nanoparticles and a preparation method thereof, which effectively overcomes the technical problems of single antibacterial spectrum and poor stability of existing plant fiber antibacterial cat litter, and can further improve the deodorization and clumping properties of plant fiber cat litter while achieving efficient broad-spectrum antibacterial effect.

[0006] To solve the above technical problems, the technical solution adopted by the present application is as follows:

[0007] A plant fiber antibacterial cat litter containing nanoparticles, comprising the following raw materials: natural plant fiber, corn starch, stone powder, corn flour, pre-gelatinized starch, guar gum, nanoparticles, natural plant essence, and biological multienzyme. The natural plant fiber is composed of potato fiber, pea fiber, cassava fiber, soybean fiber, and soybean protein fiber; The nanoparticles are composed of zinc nanoparticles, silver nanoparticles, and copper nanoparticles with an average particle size of 3-5 nm; The biological multienzyme is composed of urease, neutral protease, and lipase.

[0008] Preferably, the following raw materials are included in the absolute dry weight parts: natural plant fiber 380-420 parts, corn starch 335-365 parts, stone powder 105-125 parts, corn flour 95-105 parts, pre-gelatinized starch 17-23 parts, guar gum 2.5-3.5 parts, nanoparticles 0.06-0.07 parts, natural plant essence 0.8-1.2 parts, and biological multienzyme 8-11 parts.

[0009] Preferably, in the natural plant fiber, the weight ratio of potato fiber, pea fiber, cassava fiber, soybean fiber, and soybean protein fiber is 35-40:25-30:12-15:8-10:3.5-5; In the nanoparticles, the absolute dry weight ratio of zinc nanoparticles, silver nanoparticles, and copper nanoparticles is 1.8-2.1:1-1.2:2.9-3.

[0010] Preferably, in the biological multienzyme, the weight ratio of urease, neutral protease, and lipase is 10-11:7-8:3-4; The enzyme activity of urease is 30-50 thousand U / g; the enzyme activity of neutral protease is 50-100 thousand U / g; and the enzyme activity of lipase is 30-50 thousand U / g.

[0011] A preparation method of a plant fiber cat litter containing nanoparticles, comprising the following steps: preparing a nanoparticle dispersion liquid, and mixing and granulating; The method for preparing the nanoparticle dispersion liquid is to add zinc nanoparticle stock solution, silver nanoparticle stock solution, and copper nanoparticle stock solution into deionized water, and mix uniformly to obtain the nanoparticle dispersion liquid; The method for mixing and granulating is to uniformly mix the natural plant fiber, corn starch, stone powder, corn flour, and pre-gelatinized starch at room temperature, then uniformly mix with the functional dispersion liquid, and then granulate, followed by cooling, screening, and spreading, and then drying to a moisture content of 8.5-9.5 wt% to obtain the plant fiber cat litter containing nanoparticles; The functional dispersion liquid is a mixture of guar gum, natural plant essence, biological multienzyme, nanoparticle dispersion liquid, and deionized water.

[0012] Preferably, in the nanoparticle dispersion liquid, the concentration of zinc nanoparticles is 9000-10500 ppm, the concentration of silver nanoparticles is 5000-6000 ppm, and the concentration of copper nanoparticles is 14500-15000 ppm.

[0013] Preferably, in the preparation of the nanoparticle dispersion liquid, the average particle size of zinc nanoparticles in the zinc nanoparticle stock solution is 3-5 nm, and the concentration is 150000 ppm; the average particle size of silver nanoparticles in the silver nanoparticle stock solution is 3-5 nm, and the concentration is 150000 ppm; and the average particle size of copper nanoparticles in the copper nanoparticle stock solution is 3-5 nm, and the concentration is 150000 ppm.

[0014] Preferably, in the mixing and granulation, the dosages of the raw materials are as follows in terms of absolute dry weight parts: natural plant fiber 380-420 parts, corn starch 335-365 parts, stone powder 105-125 parts, corn flour 95-105 parts, pregelatinized starch 17-23 parts, guar gum 2.5-3.5 parts, nanoparticles 0.06-0.07 parts, natural plant essence 0.8-1.2 parts, and biological multienzyme 10-12 parts. The natural plant fiber is composed of potato fiber, pea fiber, cassava fiber, soybean fiber, and soybean protein fiber. The biological multienzyme is composed of urease, neutral protease, and lipase.

[0015] Preferably, in the natural plant fiber, the weight ratio of potato fiber, pea fiber, cassava fiber, soybean fiber, and soybean protein fiber is 35-40:25-30:12-15:8-10:3.5-5. In the biological multienzyme, the weight ratio of urease, neutral protease, and lipase is 10-11:7-8:3-4; the enzyme activity of urease is 30-50 thousand U / g; the enzyme activity of neutral protease is 50-100 thousand U / g; and the enzyme activity of lipase is 30-50 thousand U / g.

[0016] Preferably, in the process of the mixing and granulation, the added amount of deionized water in the functional dispersion liquid is 18-22% of the absolute dry weight of all the granulation raw materials.

[0017] Compared with the prior art, the technical effects of the present application are as follows:

[0018] The plant fiber antibacterial cat litter containing nanoparticles of the present application adopts potato fiber, pea fiber, cassava fiber, soybean fiber, and soybean protein fiber as natural plant fibers, and cooperates with stone powder, corn starch, corn flour, pre-gelatinized starch, guar gum and other raw materials as the main raw material of cat litter; adopts nano zinc, nano silver and nano copper with a particle size of 3-5 nm as nanoparticles to replace traditional antibacterial and deodorizing agents to realize pure physical antibacterial effect; meanwhile, cooperates with biological multienzyme composed of urease, neutral protease and lipase to realize high-efficiency antibacterial and deodorizing function. Among them, the nano zinc, nano silver and nano copper in the nanoparticles continuously release positively charged metal ions, which combine with negatively charged bacteria and molds, can destroy the cell wall or penetrate into the cell interior, and then realize pure physical high-efficiency antibacterial function; meanwhile, the nanoparticles can also realize persistent deodorizing function through catalytic decomposition and neutralization effect, and cooperate with the decomposition effect of biological multienzyme on odor substances; the mutual cooperation and synergistic effect of the foregoing technical means effectively overcome the technical problems of single antibacterial spectrum and poor stability of the existing plant fiber antibacterial cat litter, can realize high-efficiency broad-spectrum antibacterial effect, and further improve the deodorizing performance and clumping performance of the plant fiber cat litter; and the nanoparticles can also replace traditional chemical additives to play the roles of preservative and antioxidant, which can eliminate free radicals generated in the cat litter use environment, inhibit the oxidative fission of natural plant fibers, corn starch and other materials in the cat litter raw materials, prevent the yellowing and pulverization of the cat litter, effectively eliminate the adverse effects of traditional chemical additives on cats (such as the tendency of chemical additives to cause skin inflammation and respiratory inflammation of cats), and avoid the influence of chemical additives on the liver and kidney functions of cats through the licking of the cat litter by cats and the ingestion of the chemical additives by cats through the contaminated paws or fur.

[0019] Further, in the preparation method of the plant fiber antibacterial cat litter containing nanoparticles of the present application, the natural plant fiber, stone powder, pre-gelatinized starch and guar gum are pre-contacted to form a three-dimensional network structure, and then the nanoparticle dispersion liquid is introduced to realize uniform dispersion and sufficient contact, anchor the nanoparticles in the pores of the natural plant fiber or stone powder, and further improve the overall stability of the nanoparticles in the cat litter, realize long-acting and slow-release antibacterial and mildew-proof effect, and improve the antibacterial and mildew-proof durability of the cat litter.

[0020] The plant fiber antibacterial cat litter containing nanoparticles of the present application has an antibacterial rate of more than 99.9% against Escherichia coli and more than 99.9% against Staphylococcus aureus; in the antibacterial durability test, the antibacterial rate of the cat litter against Escherichia coli is still more than 99.9% and the antibacterial rate against Staphylococcus aureus is still more than 99.9% after the cat litter is continuously irradiated by a violet light for 100 h, and the antibacterial performance and antibacterial durability are excellent.

[0021] The plant fiber containing nanoparticles antibacterial cat litter of the present application has a mold resistance level of 0 grade for Aspergillus niger, Penicillium funiculosum, Chaetomium globosum, Paecilomyces variotii, Aspergillus terreus and Aureobasidium pullulans; in the mold resistance durability test, the cat litter still has a mold resistance level of 0 grade for Aspergillus niger, Penicillium funiculosum, Chaetomium globosum, Paecilomyces variotii, Aspergillus terreus and Aureobasidium pullulans after being irradiated by a violet light for 100 hours.

[0022] The plant fiber containing nanoparticles antibacterial cat litter of the present application has a deodorization rate (calculated by ammonia concentration) of more than 93.9%, a clumping property of 3.1-3.3 cm, a water absorption rate of 178.2-182.4%, a clumping strength of 97.3-98.0%, a disintegration property of 43-44 s, a hardness of 59-62 N, and good deodorization performance and clumping performance.

[0023] The preparation method of the plant fiber containing nanoparticles antibacterial cat litter of the present application has a simple process, is easy to operate, and is beneficial to large-scale industrial production. DETAILED DESCRIPTION

[0024] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific embodiments of the present application are described below. It should be pointed out that the following detailed description is exemplary and is intended to provide further description of the present application. Unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0025] It should be noted that the terms used herein are only for the purpose of describing the specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, "first", "second", and the like are used to distinguish similar objects, and are not intended to describe a particular order or sequence, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0026] The plant fiber containing nanoparticles antibacterial cat litter provided by the embodiments of the present application comprises the following raw materials in absolute dry weight parts: natural plant fiber 380-420 parts, corn starch 335-365 parts, stone powder 105-125 parts, corn flour 95-105 parts, pregelatinized starch 17-23 parts, guar gum 2.5-3.5 parts, nanoparticles 0.06-0.07 parts, natural plant essence 0.8-1.2 parts, and biological multienzyme 8-11 parts.

[0027] The natural plant fiber in the nano-particle-containing plant fiber antibacterial cat litter is composed of potato fiber, pea fiber, cassava fiber, soybean fiber and soybean protein fiber; and the weight ratio of the potato fiber, the pea fiber, the cassava fiber, the soybean fiber and the soybean protein fiber is 35-40:25-30:12-15:8-10:3.5-5.

[0028] The nano-particle in the nano-particle-containing plant fiber antibacterial cat litter is composed of nano-zinc, nano-silver and nano-copper; the average particle size of the nano-zinc, the nano-silver and the nano-copper is 3-5 nm; and the absolute dry weight ratio of the nano-zinc, the nano-silver and the nano-copper is 1.8-2.1:1-1.2:2.9-3.

[0029] The natural plant essence in the nano-particle-containing plant fiber antibacterial cat litter includes but is not limited to green tea essence, lavender essence, jasmine essence, gardenia flower essence, violet essence, lemon essence and coffee essence.

[0030] The biological multienzyme in the nano-particle-containing plant fiber antibacterial cat litter is composed of urease, neutral protease and lipase; the weight ratio of the urease, the neutral protease and the lipase is 10-11:7-8:3-4; the enzyme activity of the urease is 3-5 million U / g; the enzyme activity of the neutral protease is 5-10 million U / g; and the enzyme activity of the lipase is 3-5 million U / g.

[0031] The application further provides a preparation method of the nano-particle-containing plant fiber antibacterial cat litter, which comprises the following steps: preparing a nano-particle dispersion liquid and mixing and granulating.

[0032] The method for preparing the nano-particle dispersion liquid is that the zinc nano-particle stock solution, the silver nano-particle stock solution and the copper nano-particle stock solution are added into a water tank of a mixing device, mixed and diluted with deionized water to prepare the nano-particle dispersion liquid, wherein the concentration of the nano-zinc is 9000-10500 ppm, the concentration of the nano-silver is 5000-6000 ppm and the concentration of the nano-copper is 14500-15000 ppm.

[0033] In the preparation of the nano-particle dispersion liquid, the zinc nano-particle stock solution is obtained by a commercial channel, the average particle size of the nano-zinc in the zinc nano-particle stock solution is 3-5 nm, the concentration of the nano-zinc is 150000 ppm and the solvent is deionized water; the silver nano-particle stock solution is obtained by a commercial channel, the average particle size of the nano-silver in the silver nano-particle stock solution is 3-5 nm, the concentration of the nano-silver is 150000 ppm and the solvent is deionized water; and the copper nano-particle stock solution is obtained by a commercial channel, the average particle size of the nano-copper in the copper nano-particle stock solution is 3-5 nm, the concentration of the nano-copper is 150000 ppm and the solvent is deionized water.

[0034] The method of mixing and granulating is as follows: under room temperature conditions, the natural plant fiber, corn starch, stone powder, corn flour, and pregelatinized starch are respectively put into the feeding pit, and after each raw material is sieved, it is lifted to the distributor at the top position (about 22.5 m in height) of the automatic granulating device; the distributor feeds each raw material into the designated bin according to the classification; after receiving the formula instruction, the automatic granulating device automatically weighs and feeds each raw material into the granulating bin according to the proportioning of each raw material, and automatically mixes each raw material; at the same time, guar gum, natural plant essence, biological multienzyme, and nanoparticle dispersion liquid are put into the small material feeding area of the automatic granulating device, mixed for 10-15 min, and then deionized water is continuously added and uniformly mixed to obtain a functional dispersion liquid; then the functional dispersion liquid is fed into the granulating bin; after receiving the granulating instruction, the automatic granulating device automatically granulates; after granulation is completed, the product is cooled in the cooling machine, then enters the vibrating screen through the conveying belt, is uniformly spread by the spreader after sieving, and then enters the steam dryer for steam drying until the water content is 8.5-9.5 wt%, and then is packaged in the automatic vacuum packaging machine to obtain the plant fiber antibacterial cat litter containing nanoparticles.

[0035] In the mixing and granulating, the following raw materials are used in the mixing and granulating process by absolute dry weight fraction: natural plant fiber 380-420 parts, corn starch 335-365 parts, stone powder 105-125 parts, corn flour 95-105 parts, pregelatinized starch 17-23 parts, guar gum 2.5-3.5 parts, nanoparticles 0.06-0.07 parts, natural plant essence 0.8-1.2 parts, and biological multienzyme 10-12 parts.

[0036] In the mixing and granulating process, the amount of deionized water added in the functional dispersion liquid is 18-22% of the absolute dry weight of all granulating raw materials (natural plant fiber, corn starch, stone powder, corn flour, pregelatinized starch, guar gum, natural plant essence, biological multienzyme, and nanoparticles).

[0037] In the mixing and granulating, the natural plant fiber is composed of potato fiber, pea fiber, cassava fiber, soybean fiber, and soybean protein fiber; and the weight ratio of the potato fiber, pea fiber, cassava fiber, soybean fiber, and soybean protein fiber is 35-40:25-30:12-15:8-10:3.5-5.

[0038] In the mixing and granulating, the natural plant essence is obtained by commercial purchase, and is one of the following: green tea essence, lavender essence, jasmine essence, gardenia flower essence, violet essence, lemon essence, and coffee essence.

[0039] The biological multienzyme is composed of urease, neutral protease and lipase, and the weight ratio of urease, neutral protease and lipase is 10-11:7-8:3-4. The urease is obtained by a commercial channel, and the enzyme activity is 30-50 thousand U / g. The neutral protease is obtained by a commercial channel, and the enzyme activity is 50-100 thousand U / g. The lipase is obtained by a commercial channel, and the enzyme activity is 30-50 thousand U / g.

[0040] The application will be further described below in combination with some specific examples. Example 1

[0041] The plant fiber cat litter containing nanoparticles provided in the embodiment comprises the following raw materials in terms of absolute dry weight fraction: natural plant fiber 380 parts, corn starch 335 parts, stone powder 105 parts, corn powder 95 parts, pre-gelatinized starch 17 parts, guar gum 2.5 parts, nanoparticles 0.06 parts, natural plant essence 0.8 parts, and biological multienzyme 8 parts.

[0042] The natural plant fiber is composed of potato fiber, pea fiber, cassava fiber, soybean fiber and soybean protein fiber, and the weight ratio of potato fiber, pea fiber, cassava fiber, soybean fiber and soybean protein fiber is 35:25:12:8:3.5.

[0043] The nanoparticles are composed of nano-zinc, nano-silver and nano-copper, and the average particle size of nano-zinc, nano-silver and nano-copper is 5 nm. In the nanoparticles, the absolute dry weight ratio of nano-zinc, nano-silver and nano-copper is 1.8:1:2.9.

[0044] The natural plant essence is green tea essence.

[0045] The biological multienzyme is composed of urease, neutral protease and lipase, and the weight ratio of urease, neutral protease and lipase is 10:7:3.

[0046] The embodiment also provides a preparation method of the plant fiber cat litter containing nanoparticles. 1) Preparation of nanoparticle dispersion liquid The zinc nanoparticle stock solution, silver nanoparticle stock solution and copper nanoparticle stock solution are added into the water tank of a mixing device, mixed and diluted with deionized water to obtain a nanoparticle dispersion liquid with a concentration of 9000 ppm of nano-zinc, 5000 ppm of nano-silver and 14500 ppm of nano-copper, and the nanoparticle dispersion liquid is ready for use.

[0047] The zinc nanoparticle stock solution is obtained by a commercial channel, the average particle size of nano-zinc in the zinc nanoparticle stock solution is 5 nm, the concentration is 150000 ppm, and the solvent is deionized water.

[0048] The silver nanoparticle stock solution is purchased through a commercial channel. The average particle size of the silver nanoparticles in the silver nanoparticle stock solution is 5 nm, the concentration is 150000 ppm, and the solvent is deionized water.

[0049] The copper nanoparticle stock solution is purchased through a commercial channel. The average particle size of the copper nanoparticles in the copper nanoparticle stock solution is 5 nm, the concentration is 150000 ppm, and the solvent is deionized water.

[0050] 2) Mixing and granulation At room temperature, the natural plant fiber, corn starch, stone powder, corn flour, and pregelatinized starch are respectively put into the feeding pit. After screening, the materials are lifted to the distributor at the top of the automatic granulation device (about 22.5 m high). The distributor feeds the materials into the designated bin according to the classification. After receiving the formula instruction, the automatic granulation device automatically weighs and feeds the materials into the granulation bin according to the absolute dry weight of each material. The materials are mixed automatically. At the same time, guar gum, natural plant essence, biological multienzyme, and nanoparticle dispersion liquid are added into the small material feeding area of the automatic granulation device and mixed for 10 minutes. Then, deionized water is continuously added and uniformly mixed to obtain a functional dispersion liquid. Then, the functional dispersion liquid is fed into the granulation bin. After receiving the granulation instruction, the automatic granulation device automatically granulates. After granulation, the product is cooled in the cooling machine, then enters the vibrating screen through the conveyor belt, is uniformly spread by the spreader, and is steam dried in the dryer until the moisture content is 9 wt%. Then, the product is packaged in the automatic vacuum packaging machine to obtain the plant fiber antibacterial cat litter containing nanoparticles.

[0051] The amount of deionized water added in the functional dispersion liquid is 18% of the absolute dry weight of all granulation materials (natural plant fiber, corn starch, stone powder, corn flour, pregelatinized starch, guar gum, natural plant essence, biological multienzyme, and nanoparticles).

[0052] The natural plant essence is purchased through a commercial channel. Specifically, it is green tea essence.

[0053] The urease is purchased through a commercial channel, with an enzyme activity of 50,000 U / g. The neutral protease is purchased through a commercial channel, with an enzyme activity of 100,000 U / g. The lipase is purchased through a commercial channel, with an enzyme activity of 50,000 U / g. Example 2

[0054] The plant fiber antibacterial cat litter containing nanoparticles provided in this example includes the following raw materials in absolute dry weight: natural plant fiber 400 parts, corn starch 350 parts, stone powder 110 parts, corn flour 100 parts, pregelatinized starch 21 parts, guar gum 3 parts, nanoparticles 0.065 parts, natural plant essence 0.9 parts, and biological multienzyme 10.3 parts.

[0055] The natural plant fiber is composed of potato fiber, pea fiber, cassava fiber, soybean fiber and soybean protein fiber; the weight ratio of the potato fiber, the pea fiber, the cassava fiber, the soybean fiber and the soybean protein fiber is 38:27:14:9:4.

[0056] The nanoparticles are composed of nano-zinc, nano-silver and nano-copper; the average particle size of the nano-zinc, the nano-silver and the nano-copper is 5nm; the absolute dry weight ratio of the nano-zinc, the nano-silver and the nano-copper in the nanoparticles is 2:1:3.

[0057] The natural plant essence is coffee essence.

[0058] The biological multienzyme is composed of urease, neutral protease and lipase; the weight ratio of the urease, the neutral protease and the lipase is 10.6:7.5:3.4.

[0059] The embodiment also provides a preparation method of the aforementioned cat litter with nanoparticles and plant fiber. 1) Preparation of nanoparticle dispersion liquid The zinc nanoparticle stock solution, the silver nanoparticle stock solution and the copper nanoparticle stock solution are added into a water tank of a mixing device, mixed and diluted with deionized water to obtain a nanoparticle dispersion liquid with a concentration of 1000ppm of nano-zinc, 5000ppm of nano-silver and 15000ppm of nano-copper.

[0060] The zinc nanoparticle stock solution is obtained by a commercial channel, the average particle size of the nano-zinc in the zinc nanoparticle stock solution is 5nm, the concentration is 150000ppm, and the solvent is deionized water.

[0061] The silver nanoparticle stock solution is obtained by a commercial channel, the average particle size of the nano-silver in the silver nanoparticle stock solution is 5nm, the concentration is 150000ppm, and the solvent is deionized water.

[0062] The copper nanoparticle stock solution is obtained by a commercial channel, the average particle size of the nano-copper in the copper nanoparticle stock solution is 5nm, the concentration is 150000ppm, and the solvent is deionized water.

[0063] 2) Mixing and granulation The natural plant fiber, corn starch, stone powder, corn flour, and pregelatinized starch are respectively put into the feeding pit under room temperature, and each raw material is sieved and lifted to the distributor at the top position (about 22.5 m in height) of the automatic granulating device; the distributor feeds each raw material to the designated bin according to the classification; after receiving the formula instruction, the automatic granulating device automatically weighs and feeds each raw material into the granulating bin according to the absolute dry weight parts of each raw material, and automatically mixes each raw material; at the same time, guar gum, natural plant essence, biological multienzyme, and nano-particle dispersion liquid are put into the small material feeding area of the automatic granulating device, mixed for 12 min, and then deionized water is continuously added and uniformly mixed to obtain a functional dispersion liquid; then the functional dispersion liquid is fed into the granulating bin; after receiving the granulating instruction, the automatic granulating device automatically granulates; after granulation, the product is cooled in the cooling machine, and then enters the vibrating screen through the conveying belt, is uniformly spread by the spreader, and then enters the steam dryer for drying until the water content is 9 wt%, and is packaged in the automatic vacuum packaging machine to obtain the plant fiber antibacterial cat litter containing nano-particles.

[0064] In the functional dispersion liquid, the amount of deionized water added is 20% of the absolute dry weight of all granulating raw materials (natural plant fiber, corn starch, stone powder, corn flour, pregelatinized starch, guar gum, natural plant essence, biological multienzyme, and nano-particles).

[0065] The natural plant essence is obtained by commercial purchase, and is specifically coffee essence.

[0066] The urease is obtained by commercial purchase, and has an enzyme activity of 50,000 U / g; the neutral protease is obtained by commercial purchase, and has an enzyme activity of 100,000 U / g; and the lipase is obtained by commercial purchase, and has an enzyme activity of 50,000 U / g. Example 3

[0067] The plant fiber antibacterial cat litter containing nano-particles provided in this embodiment includes the following raw materials in absolute dry weight parts: natural plant fiber 420 parts, corn starch 365 parts, stone powder 125 parts, corn flour 105 parts, pregelatinized starch 23 parts, guar gum 3.5 parts, nano-particles 0.07 parts, natural plant essence 1.2 parts, and biological multienzyme 11 parts.

[0068] The natural plant fiber is composed of potato fiber, pea fiber, cassava fiber, soybean fiber, and soybean protein fiber, and the weight ratio of the potato fiber, pea fiber, cassava fiber, soybean fiber, and soybean protein fiber is 40:30:15:10:5.

[0069] The nano-particles are composed of nano-zinc, nano-silver, and nano-copper, and the average particle size of the nano-zinc, nano-silver, and nano-copper is 5 nm; and the absolute dry weight ratio of the nano-zinc, nano-silver, and nano-copper in the nano-particles is 2.1:1.2:3.

[0070] The natural plant essence is lavender essence.

[0071] The biological multienzyme is composed of urease, neutral protease and lipase, and the weight ratio of the urease, neutral protease and lipase is 11:8:4.

[0072] The embodiment also provides a preparation method of the plant fiber cat litter containing nanoparticles and having antibacterial property. 1) Preparation of nanoparticle dispersion liquid The zinc nanoparticle stock solution, silver nanoparticle stock solution and copper nanoparticle stock solution are added into a water tank of a mixing equipment, mixed and diluted with deionized water to obtain a nanoparticle dispersion liquid with a concentration of 10500 ppm of zinc nanoparticles, a concentration of 6000 ppm of silver nanoparticles and a concentration of 15000 ppm of copper nanoparticles, and the nanoparticle dispersion liquid is ready for use.

[0073] The zinc nanoparticle stock solution is obtained by a commercial channel, the average particle size of zinc nanoparticles in the zinc nanoparticle stock solution is 5 nm, the concentration of zinc nanoparticles is 150000 ppm, and the solvent is deionized water.

[0074] The silver nanoparticle stock solution is obtained by a commercial channel, the average particle size of silver nanoparticles in the silver nanoparticle stock solution is 5 nm, the concentration of silver nanoparticles is 150000 ppm, and the solvent is deionized water.

[0075] The copper nanoparticle stock solution is obtained by a commercial channel, the average particle size of copper nanoparticles in the copper nanoparticle stock solution is 5 nm, the concentration of copper nanoparticles is 150000 ppm, and the solvent is deionized water.

[0076] 2) Mixing and granulation At room temperature, the natural plant fiber, corn starch, stone powder, corn powder and pregelatinized starch are respectively put into a feeding pit, and after screening, the raw materials are lifted to a distributor at a top position (about 22.5 m in height) of an automatic granulation device; the distributor feeds the raw materials into designated hoppers according to the classification; after receiving a formula instruction, the automatic granulation device automatically weighs and feeds the raw materials into a granulation bin according to the absolute dry weight parts of the raw materials, and automatically mixes the raw materials; at the same time, guar gum, natural plant essence, biological multienzyme and nanoparticle dispersion liquid are put into a small material feeding area of the automatic granulation device, mixed for 15 min, and then deionized water is continuously added and uniformly mixed to obtain a functional dispersion liquid; then the functional dispersion liquid is fed into the granulation bin; after receiving a granulation instruction, the automatic granulation device performs automatic granulation; after granulation, the granulation is cooled in a cooling machine, and then enters a vibrating screen through a conveyor belt, is uniformly spread by a spreader after screening, and then enters a steam dryer for steam drying until the water content is 9 wt%, and then enters an automatic vacuum packaging machine for packaging to obtain the plant fiber cat litter containing nanoparticles and having antibacterial property.

[0077] The amount of deionized water added to the functional dispersion is 22% of the total dry weight of all granulation raw materials (natural plant fiber, corn starch, stone powder, corn flour, pregelatinized starch, guar gum, natural plant fragrance, biopolymerase, nanoparticles).

[0078] Natural plant fragrances are obtained through commercial channels, specifically lavender fragrance.

[0079] Urease was obtained through commercial purchase, with an enzyme activity of 50,000 U / g; neutral protease was obtained through commercial purchase, with an enzyme activity of 100,000 U / g; lipase was obtained through commercial purchase, with an enzyme activity of 50,000 U / g.

[0080] The antibacterial properties and antibacterial durability of the cat litter from Examples 1-3 were tested. The antibacterial properties were tested according to Appendix A of HG / T3950-2007, with a blank control group included. The average recovered colony count and antibacterial rate were measured after 24 hours. The antibacterial durability was tested using a 30W, 253.7nm ultraviolet lamp, placed 0.8m away from the cat litter, for 100 hours, followed by testing according to the antibacterial properties testing method. The specific results are shown below:

[0081] The antifungal properties and antifungal durability of the cat litter from Examples 1-3 were tested. The antifungal properties were tested using the method described in HG / T3950-2007, specifically using Aspergillus niger (…). Aspergillus niger AS3.4463, Penicillium cordiformis ( Penicillium funieulosum AS3.3875, Chaetomium globulus ( Chaetomium globostum AS3.4254, Penicillium wanensis ( Paecilomyces varioti AS3.4253, Aspergillus terreus ( Asp.terreus ) AS3.3935, Aureobasidium pullulans ( Aureobasidiumpullalans AS3.3984. The method for testing anti-mold durability is as follows: a 30W ultraviolet lamp with a wavelength of 253.7nm is used, placed 0.8m away from the cat litter, and continuously irradiated for 100h, and then tested according to the anti-mold performance testing method.

[0082] Antifungal properties and antifungal durability are rated according to the following mold growth levels: Level 0 - No growth, i.e., no growth observed under a microscope (50x magnification); Level 1 - Trace growth, i.e., growth is visible to the naked eye, but the growth coverage area is less than 10%; Level 2 - Growth coverage area is greater than 10%. Specific results are shown below:

[0083] The deodorization performance of the cat litter of Examples 1-3 was detected respectively, and the detection method referred to T / SDPIA 05-2022 "General Technical Specification for Pet Cat Litter". The specific detection method was to detect the deodorization rate of cat litter (calculated by ammonia concentration). The specific results are shown as follows:

[0084] The clumping property, water absorption rate, clumping strength, disintegration, and hardness of the cat litter of Examples 1-3 were detected respectively, and the specific detection method referred to T / CIQA 11-2020 "Cat Litter Specification". The specific results are shown as follows:

[0085] The plant fiber antibacterial cat litter containing nanoparticles of the application uses potato fiber, pea fiber, cassava fiber, soybean fiber, and soybean protein fiber as natural plant fibers, and is combined with stone powder, corn starch, corn flour, pre-gelatinized starch, guar gum and other raw materials as the main raw material of cat litter; the particle size of the nano zinc, nano silver and nano copper is 3-5 nm, which is used as nanoparticles to replace traditional antibacterial and deodorizing agents; at the same time, biological multienzyme composed of urease, neutral protease and lipase is used to realize high-efficiency antibacterial and deodorizing function. Among them, the nano zinc, nano silver and nano copper in the nanoparticles can continuously release positively charged metal ions, which can combine with negatively charged bacteria and mold, and can realize high-efficiency antibacterial function by destroying the cell wall or penetrating into the cell interior; at the same time, the nanoparticles can also realize persistent deodorizing function by catalytic decomposition and neutralization effect, and the decomposition effect of biological multienzyme on odor substances; the above technical means cooperate with each other to effectively overcome the technical problems of single antibacterial spectrum and poor stability of existing plant fiber antibacterial cat litter, and can realize high-efficiency broad-spectrum antibacterial while further improving the deodorizing performance and clumping performance of plant fiber cat litter; and the nanoparticles can also replace traditional chemical additives to play the roles of preservative and antioxidant.

[0086] Further, in the preparation method of the plant fiber antibacterial cat litter containing nanoparticles of the application, the natural plant fiber, stone powder, pre-gelatinized starch and guar gum are pre-contacted to form a three-dimensional network structure, and then the nano-particle dispersion liquid is introduced to realize uniform dispersion and sufficient contact, and at the same time, the nano-particles are anchored in the pores of the natural plant fiber or the stone powder, so that the nano-particles have high stability in the whole cat litter, and can realize long-acting and slow-releasing antibacterial and mold-proof, and improve the durability of the cat litter in antibacterial and mold-proof.

[0087] Unless otherwise specified, the percentages used in the application are mass percentages.

[0088] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalent ones. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A plant fiber antibacterial cat litter containing nanoparticles, characterized in that, It includes the following raw materials: natural plant fiber, corn starch, stone powder, corn flour, pregelatinized starch, guar gum, nanoparticles, natural plant flavorings, and biopolymerase; The natural plant fiber is composed of potato fiber, pea fiber, cassava fiber, soybean fiber, and soybean protein fiber; The nanoparticles are composed of nano-zinc, nano-silver, and nano-copper with an average particle size of 3-5 nm. The biopolymerase is composed of urease, neutral protease, and lipase.

2. The plant fiber antibacterial cat litter containing nanoparticles according to claim 1, characterized in that, Based on oven-dry weight, it includes the following raw materials: 380-420 parts natural plant fiber, 335-365 parts corn starch, 105-125 parts stone powder, 95-105 parts corn flour, 17-23 parts pregelatinized starch, 2.5-3.5 parts guar gum, 0.06-0.07 parts nanoparticles, 0.8-1.2 parts natural plant fragrance, and 8-11 parts biopolymerase.

3. The plant fiber antibacterial cat litter containing nanoparticles according to claim 1, characterized in that, The weight ratio of potato fiber, pea fiber, cassava fiber, soybean fiber, and soybean protein fiber in the natural plant fiber is 35-40:25-30:12-15:8-10:3.5-5. The nanoparticles contain zinc nanoparticles, silver nanoparticles, and copper nanoparticles in an oven-dry weight ratio of 1.8-2.1:1-1.2:2.9-3.

4. The plant fiber antibacterial cat litter containing nanoparticles according to claim 1, characterized in that, In the aforementioned biopolymerase, the weight ratio of urease, neutral protease, and lipase is 10-11:7-8:3-4. Urease has an enzyme activity of 30,000-50,000 U / g; neutral protease has an enzyme activity of 50,000-100,000 U / g; and lipase has an enzyme activity of 30,000-50,000 U / g.

5. A method for preparing plant fiber antibacterial cat litter containing nanoparticles, characterized in that, It consists of the following steps: preparing a nanoparticle dispersion, mixing and granulation; The method for preparing the nanoparticle dispersion is to add zinc nanoparticle stock solution, silver nanoparticle stock solution and copper nanoparticle stock solution to deionized water, mix them evenly, and obtain the nanoparticle dispersion. The method of mixing and granulating is as follows: under room temperature conditions, natural plant fiber, corn starch, stone powder, corn flour and pregelatinized starch are mixed evenly, and then mixed evenly with functional dispersion liquid and granulated. After cooling, sieving and spreading, the mixture is dried to a moisture content of 8.5-9.5 wt% to obtain plant fiber antibacterial cat litter containing nanoparticles. The functional dispersion is a mixture of guar gum, natural plant fragrance, biopolymerase, nanoparticle dispersion and deionized water.

6. The method for preparing plant fiber antibacterial cat litter containing nanoparticles according to claim 5, characterized in that, In the nanoparticle dispersion, the concentration of zinc nanoparticles is 9000-10500 ppm, the concentration of silver nanoparticles is 5000-6000 ppm, and the concentration of copper nanoparticles is 14500-15000 ppm.

7. The method for preparing plant fiber antibacterial cat litter containing nanoparticles according to claim 5, characterized in that, In the preparation of the nanoparticle dispersion, the average particle size of the zinc nanoparticle stock solution is 3-5 nm and the concentration is 150,000 ppm; the average particle size of the silver nanoparticle stock solution is 3-5 nm and the concentration is 150,000 ppm; and the average particle size of the copper nanoparticle stock solution is 3-5 nm and the concentration is 150,000 ppm.

8. The method for preparing plant fiber antibacterial cat litter containing nanoparticles according to claim 5, characterized in that, In the mixing and granulation process, the amounts of each raw material used, based on their oven-dry weight, are as follows: 380-420 parts natural plant fiber, 335-365 parts corn starch, 105-125 parts stone powder, 95-105 parts corn flour, 17-23 parts pregelatinized starch, 2.5-3.5 parts guar gum, 0.06-0.07 parts nanoparticles, 0.8-1.2 parts natural plant fragrance, and 10-12 parts biopolymerase. The natural plant fiber is composed of potato fiber, pea fiber, cassava fiber, soybean fiber, and soybean protein fiber; The biopolymerase is composed of urease, neutral protease, and lipase.

9. The method for preparing plant fiber antibacterial cat litter containing nanoparticles according to claim 8, characterized in that, The weight ratio of potato fiber, pea fiber, cassava fiber, soybean fiber, and soybean protein fiber in the natural plant fiber is 35-40:25-30:12-15:8-10:3.5-5. In the aforementioned biopolymerase, the weight ratio of urease, neutral protease, and lipase is 10-11:7-8:3-4; the enzyme activity of urease is 30,000-50,000 U / g; the enzyme activity of neutral protease is 50,000-100,000 U / g; and the enzyme activity of lipase is 30,000-50,000 U / g.

10. The method for preparing plant fiber antibacterial cat litter containing nanoparticles according to claim 5, characterized in that, In the process of mixing and granulation, the amount of deionized water added to the functional dispersion is 18-22% of the total dry weight of the granulation raw materials.

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