Air purifier for livestock and poultry sheds and preparation method thereof

Abstract

The invention belongs to the technical field of air purifiers, and in particular relates to an air purifier for livestock and poultry sheds and a preparation method thereof; the air purifier is provided with a fragrance layer, an adsorption layer and a deodorization layer in sequence from top to bottom, wherein: the fragrance layer comprises a first carrier and a first plant extract; the first plant extract comprises a green persimmon extract, a citrus jujube extract, a jujube seed extract, a papaya extract and a passion fruit shell extract; the adsorption layer comprises a second carrier and a second plant extract; the second plant extract comprises a tea leaf extract, a bitter melon extract, a dandelion extract, a pomegranate peel extract and a honeysuckle extract; and the deodorization layer comprises activated carbon and nano silver oxide.

Description

Technical Field

[0001] The invention relates to the technical field of air purifiers, and in particular to an air purifier for livestock and poultry sheds and a preparation method thereof. Background Art

[0002] In the current intensive farming model, livestock and poultry are mainly raised in closed livestock and poultry pens. Due to the high breeding density, microorganisms in livestock and poultry pens are prone to multiply in large numbers, forming high-concentration aerosols carrying pathogenic microorganisms such as bacteria, viruses, fungi, and endotoxins, which seriously affect the growth and health of livestock and poultry.

[0003] Ventilation can effectively improve the environmental quality in livestock and poultry houses, but ventilation in winter will cause the temperature in livestock and poultry houses to drop. In order to maintain the temperature in the house, the minimum ventilation volume is generally used in winter, which often leads to the deterioration of the environment in livestock and poultry houses. At present, the commonly used method to improve the environment in livestock and poultry houses is to spray chemical disinfectants, including quaternary ammonium salts, formaldehyde, potassium permanganate, iodine, peracetic acid, etc. These chemical disinfectants kill harmful microorganisms while also killing some beneficial microorganisms, causing an imbalance in the microecology of the environment, and are also prone to cause bacterial resistance and chemical damage to the surface of livestock and poultry.

[0004] Therefore, the antibacterial effect and air freshening effect of natural plant extracts can be used in air purification in livestock and poultry farming.

[0005] Chinese patent document CN106540535A discloses an air purifier for animal husbandry, wherein the materials in the air purifier are composed of 20%-40% montmorillonite, 1%-2% peptone, 4%-8% Lactobacillus acidophilus, 2%-5% zinc oxide, and the balance is distilled water. In terms of disease control, it can not only purify harmful gases such as ammonia and hydrogen sulfide in the air, directly avoid the corrosion of harmful gases to the respiratory system, and avoid the toxic side effects of chemical disinfectants, but also can adsorb and reduce pathogenic microorganisms of viruses and bacteria in the air to the greatest extent, greatly reducing the incidence of respiratory diseases, and also plays a role in drying the environment, which is not conducive to the reproduction and survival of pathogenic microorganisms. However, the air purifier cannot effectively eliminate unpleasant odors in the air.

[0006] Chinese patent document CN105879095A discloses an air deodorant for a farm and a preparation method thereof. The air deodorant comprises the following raw materials in parts by weight: 80-90 parts of eucommia extract, 50-60 parts of angelica extract, 40-50 parts of lithospermum extract, 30-40 parts of azalea extract, 7-8 parts of pomegranate peel polyphenols, 2-3 parts of papaya polyphenols, 0.5-1 parts of sorbitol, 0.5-0.8 parts of litsea cubeba essential oil, 1-2 parts of glycerol, 0.5-1 parts of modified soybean lecithin, 0.3-0.5 parts of sodium diacetate, and 0.5-1 parts of chlorogenic acid. The air deodorant can effectively remove malodorous substances such as hydrogen sulfide, mercaptans, ammonia, methylamine, nicotine, aldehydes, ketones, ethers, halogenated hydrocarbons, and low-molecular fatty acids contained in the air, purify the air, and make the air fresh and natural; however, the air deodorant cannot inhibit the reproduction and survival of pathogenic microorganisms. Summary of the invention

[0007] The purpose of the present invention is to provide an air purifier for livestock and poultry sheds and a preparation method thereof, which greatly improves the ability to inhibit bacteria and has a pleasant smell, thereby improving the environment for livestock and poultry breeding.

[0008] To achieve the above-mentioned purpose of the invention, the technical solution of the present invention is as follows:

[0009] The present invention provides an air purifier for livestock and poultry sheds, wherein the air purifier for livestock and poultry sheds is provided with a fragrance layer, an adsorption layer and a deodorization layer in sequence from top to bottom, wherein;

[0010] The fragrance layer comprises a first carrier and a first plant extract; the first plant extract comprises green persimmon extract, cirsium japonicum extract, jujube kernel extract, papaya extract and passion fruit shell extract;

[0011] The adsorption layer includes a second carrier and a second plant extract; the second plant extract includes a tea leaf extract, a bitter melon extract, a dandelion extract, a pomegranate peel extract and a honeysuckle extract;

[0012] The deodorizing layer comprises activated carbon and nano silver oxide.

[0013] In one aspect of the present invention, the fragrance layer further comprises natural plant essential oil and sodium citrate.

[0014] In one aspect of the present invention, the first carrier and the second carrier are polystyrene microspheres with a diameter of 10-100 μm.

[0015] In one aspect of the present invention, the first carrier and the second carrier are polystyrene microspheres with a diameter of 20-75 μm.

[0016] In one aspect of the present invention, the porosity of the first carrier is selected from 80% to 93%.

[0017] In one aspect of the present invention, the specific surface area of ​​the first carrier is selected from 16-26 m 2 / g.

[0018] In one aspect of the present invention, the porosity of the second carrier is selected from 65% to 79%.

[0019] In one aspect of the present invention, the specific surface area of ​​the first carrier is selected from 20-35 m 2 / g.

[0020] In one aspect of the present invention, the weight ratio of the first carrier to the first plant extract is selected from 1:(0.2-0.5).

[0021] In one aspect of the present invention, the fragrance layer includes 1-3 parts of green persimmon extract, 1-5 parts of citrus grandis extract, 1-3 parts of spiny jujube kernel extract, 0.5-1 parts of papaya extract and 1-10 parts of passion fruit shell extract, calculated by weight.

[0022] In one aspect of the present invention, preferably, calculated by weight, the fragrance layer includes 2.5 parts of green persimmon extract, 1.5 parts of citrus grandis extract, 1.2 parts of spiny jujube kernel extract, 0.8 parts of papaya extract and 5 parts of passion fruit shell extract.

[0023] In one aspect of the present invention, the weight ratio of the second carrier to the second plant extract is selected from 1:(0.3-0.7).

[0024] In one aspect of the present invention, the adsorption layer comprises 1-3 parts of tea leaf extract, 1-3 parts of bitter melon extract, 1-2 parts of dandelion extract, 1-3 parts of pomegranate peel extract and 3-5 parts of honeysuckle extract, calculated by weight.

[0025] In one aspect of the present invention, the adsorption layer comprises, by weight, 1-1.5 parts of tea leaf extract, 1-2 parts of bitter melon extract, 1-1.5 parts of dandelion extract, 1-1.5 parts of pomegranate peel extract and 3-4 parts of honeysuckle extract.

[0026] In one aspect of the present invention, the adsorption layer includes 1.2 parts of tea leaf extract, 1.5 parts of bitter melon extract, 1.2 parts of dandelion extract, 1.2 parts of pomegranate peel extract and 3.5 parts of honeysuckle extract, calculated by weight.

[0027] In one aspect of the present invention, the weight ratio of the adsorption layer to the deodorization layer is selected from 1:(1.2-2.5).

[0028] In one aspect of the present invention, the weight ratio of the adsorption layer, the deodorization layer and the fragrance layer is selected from 1:(1.2-2.5):(0.5-1.5).

[0029] In one aspect of the present invention, the polystyrene microspheres are prepared by a high internal phase emulsion template method.

[0030] The present invention also provides a method for preparing the above-mentioned livestock and poultry house air purifier, the method comprising the following steps:

[0031] Step 1: preparing the first carrier and the second carrier by a high internal phase emulsion template method;

[0032] Step 2: Add the first carrier, natural plant essential oil, sodium citrate, green persimmon extract, citrus grandis extract, jujube seed extract, papaya extract, and passion fruit shell extract into the reactor according to weight; stir at room temperature for 1-3 hours to obtain a fragrance layer;

[0033] Step 3: Add the second carrier, tea leaf extract, bitter melon extract, dandelion extract, pomegranate peel extract and honeysuckle extract into the reactor according to weight; stir at room temperature for 1-3 hours, and dry to obtain an adsorption layer;

[0034] Step 4: Add activated carbon and nano silver oxide into the reactor according to weight, mix well, and obtain a deodorizing layer;

[0035] Step 5: Pour the deodorizing layer, the adsorption layer and the fragrance layer into the mold in order to obtain the livestock and poultry house air purifier.

[0036] The beneficial effects of the present invention are as follows: the livestock and poultry house air purifier provided by the present invention has excellent bactericidal and sterilizing performance against a variety of bacteria, and has stable properties, and can produce a lasting refreshing effect on the ambient air. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a TEM image of the polystyrene microspheres prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0038] The following non-limiting examples can enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. The following content is only an exemplary description of the scope of the present invention, and those skilled in the art can make various changes and modifications to the invention of the present invention based on the disclosed content, and they should also fall within the scope of the present application.

[0039] As used herein, the terms "comprises," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus comprising the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, step, method, article, or apparatus.

[0040] When amount, concentration or other value or parameter is expressed as range, preferred range or a series of upper preferred value and lower preferred value limit range, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value and any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when disclosing range "1 to 5", described range should be interpreted as including range "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc. When numerical range is described in this article, unless otherwise stated, the range is intended to include its end value and all integers and fractions within the range.

[0041] Singular forms include plural references unless the context clearly indicates otherwise. "Optional" or "either" means that the subsequently described event or incident may or may not occur, and that the description includes instances where the event occurs and instances where it does not.

[0042] The indefinite articles "a" and "an" before the elements or components of the present invention have no limitation on the quantity requirements (i.e. the number of occurrences) of the elements or components. Therefore, "a" or "an" should be interpreted as including one or at least one, and the elements or components in the singular form also include the plural form, unless the number is obviously intended to be in the singular form.

[0043] A first aspect of the present invention provides an air purifier for livestock and poultry sheds, which is provided with a fragrance layer, an adsorption layer and a deodorization layer in sequence from top to bottom, the fragrance layer comprising a first carrier, green persimmon extract, great citrus extract, wild jujube kernel extract, papaya extract and passion fruit shell extract, and optionally comprising natural plant essential oils and sodium citrate; the adsorption layer comprising a second carrier, tea leaf extract, bitter melon extract, dandelion extract, pomegranate peel extract and honeysuckle extract; the deodorization layer comprising activated carbon and nano silver oxide.

[0044] The natural plant essential oil is one or more of rose essential oil, jasmine essential oil and lavender essential oil.

[0045] Green Persimmon Extract

[0046] Persimmon (Diospyros kaki Thunb.) is the fruit of the persimmon tree of the Diospyros genus of the Ebenaceae family. It is one of the five major fruits in the world and has high nutritional value and health benefits. Green persimmon is an immature persimmon fruit, which contains rich bioactive substances such as tannins, flavonoids, polysaccharides, etc. During the growth process of persimmons, a large number of fruits will fall. Green persimmon resources are abundant, but the utilization rate is very low, resulting in serious waste of resources.

[0047] In the present invention, the green persimmon extract can be prepared by the following method, but is not limited thereto:

[0048] The green persimmons were washed, the stems and cores were removed, and then cut into 5 mm thick slices; they were pre-frozen at -80°C for 24 hours, placed in a vacuum freeze drying oven for drying for 24 hours, and then ground into green persimmon powder using a multifunctional grinder, and 80% acetone was added at a solid-liquid ratio of 1:100. The powder was ultrasonically extracted at 50°C for 30 minutes and then filtered. The residue was extracted twice in the same way, and the filtrates were combined and concentrated by evaporation at 50°C and 0.09 MPa until it became viscous to obtain a crude green persimmon extract. The crude extract is then purified by adsorption on a HPD-500 macroporous resin that has been pre-activated with ethanol and acid and alkali. The loading volume is 1 / 3 of the column volume, the loading flow rate is 0.8-1.0 mL / min, and the loading is maintained for 2 hours. It is eluted with distilled water until it is colorless and no reducing sugar is detected, and then eluted with 100% methanol at 2.0 mL / min. The methanol eluate is collected until the effluent does not contain polyphenols and flavonoids (FeCl3 detection method), and then the methanol eluate is evaporated and concentrated at 50°C and 0.09 MPa to become viscous, and freeze-dried to obtain the green persimmon extract.

[0049] In the present invention, the above-mentioned green persimmon crude extract can be used directly as the green persimmon extract.

[0050] Thistle Extract

[0051] The dried aerial part of the Asteraceae plant Cir-sium japonicum Fisch.ex DC. has the effects of cooling blood and stopping bleeding, dispersing blood stasis, detoxifying and eliminating carbuncle. Modern pharmacological studies have shown that Cir-sium japonicum has the effect of lowering blood lipids in experimental animals and protecting the liver.

[0052] In the present invention, the cirsium japonicum extract can be prepared by the following method, but is not limited thereto:

[0053] Take 1kg of Cirsium japonicum slices, add 20L of water, decoct for 2h, and filter while hot; repeat the decoction once, combine the filtrates twice and concentrate to obtain a crude Cirsium japonicum extract solution. Use the pretreated D101 macroporous adsorption resin to stand at room temperature to adsorb the crude Cirsium japonicum extract solution for 24h, elute with 2 times the amount of pure water at room temperature, and then stand at room temperature with 2 times the amount of 95% ethanol for dissociative adsorption for 2h, and collect the 95% ethanol dissociative adsorption liquid. Repeat twice more, combine the 95% ethanol dissociative adsorption liquid, concentrate, and freeze-dry to obtain Cirsium japonicum extract, with a yield of 3.28%.

[0054] In the present invention, the Cirrus citrinum crude extract solution can be directly evaporated to obtain the Cirrus citrinum crude extract as the Cirrus citrinum extract.

[0055] Ziziphus jujuba seed extract

[0056] Ziziphus jujuba kernel is the dried mature seed of Ziziphus jujuba Mill.var.spinosa (Bunge) Hu exH.F.Chou, a plant of the Rhamnaceae family. It was first recorded in "Shennong's Herbal Classic". It tastes sweet, is neutral in nature, and has the effects of calming the mind, promoting salivation, and nourishing the liver.

[0057] In the present invention, the spiny jujube seed extract can be prepared by the following method, but is not limited thereto:

[0058] Take an appropriate amount of Chinese jujube kernel, grind it, pass it through a 60-mesh sieve, defatted it with petroleum ether, accurately weigh 20 g of dry defatted powder, reflux extract the Chinese jujube kernel powder, ethanol and ultrapure water (1:15:15) at 80°C for 3 h, filter, centrifuge, take the supernatant, and concentrate it by rotary evaporation to the required concentration.

[0059] Papaya Extract

[0060] Papaya is the dried, nearly mature fruit of the Rosaceae plant Malus officinalis. It is a Chinese medicinal variety that is both edible and medicinal, and its resources are abundant. The Chinese Pharmacopoeia (2020 edition) records that papaya has the effects of "relaxing the meridians and activating the collaterals, and harmonizing the stomach and removing dampness".

[0061] In the present invention, the papaya extract can be prepared by the following method, but is not limited thereto:

[0062] The papaya is dried and crushed, and then refluxed and extracted with 75% by volume ethanol. The obtained extract is extracted with dichloromethane and ethyl acetate in sequence to obtain a crude papaya extract; the crude extract is separated with D101 macroporous adsorption resin, and then eluted with water and 30% by volume ethanol; the eluent is adjusted to pH=12 with dilute NaOH, and extracted with n-hexane; the aqueous layer solution is adjusted to pH=5 with dilute HCl, and then extracted with ethyl acetate for multiple times; the ethyl acetate layer solution is collected, and evaporated to obtain a papaya extract.

[0063] In the present invention, the above-mentioned papaya crude extract can be directly used as the papaya extract.

[0064] Passion fruit husk extract:

[0065] Passion fruit is an important specialty economic fruit that grows in tropical and subtropical areas. It is the fruit of the genus Passiflora in the family Passifloraceae. Passion fruit contains bioactive substances such as polysaccharides, flavonoids, polyphenols, alkaloids and carotenoids. Its extract has physiological functions such as anti-anxiety, anti-oxidation, anti-inflammatory, antibacterial and blood pressure lowering. At present, passion fruit is mainly produced as juice. The weight of its shell accounts for about 50% of the weight of a single fruit. The shell also contains a variety of bioactive substances. However, a large amount of shells are discarded as waste, resulting in a huge waste of resources and pollution to the environment.

[0066] In the present invention, the passion fruit shell extract can be prepared by the following method, but is not limited thereto:

[0067] Select mature, purple-red, fresh passion fruit shells, wash and crush them, place them in a 60°C thermostat to dry, and seal and dry them for storage. Crush the dried shells and pass them through a 100-mesh sieve. Accurately weigh 40g of dried shell powder, add distilled water at a solid-liquid ratio of 1:35, soak them in a 70°C water bath for 50 minutes, and then use ultrasonic-assisted extraction to extract them. Set the temperature to 70°C and the ultrasonic power to 480W. After 50 minutes of extraction, collect the filtrate (passion fruit shell crude extract solution) and the residue by suction filtration. Add 25 times of distilled water to the collected residues, extract them twice for 40 minutes, and then filter them. Discard the residues, combine the filtrates, and concentrate them to a volume of 1:3 (m / V) by rotary evaporation at 60°C. Use the Sevag method to remove protein from the concentrate, and repeat several times until there is no white layer between the water layer and the organic layer after oscillation. Add 3 volumes of 95% ethanol to the protein-removed concentrate, let stand overnight at 4°C, collect solid precipitates and supernatants by centrifugation, add 95% ethanol to the collected supernatant to a final concentration of 70%, let stand overnight at 4°C, collect solid precipitates by centrifugation. Add 1:3 (m / V) anhydrous ethanol, acetone and ether to the collected solid precipitates, wash them in sequence, let stand for 30 minutes each time, centrifuge to remove the supernatant, put them in a 60°C oven for low-temperature drying, and obtain passion fruit shell extract.

[0068] In the present invention, the passion fruit shell crude extract obtained by directly evaporating the passion fruit shell crude extract solution can be used as the passion fruit shell extract.

[0069] Tea Leaf Extract:

[0070] The natural substance tea leaves contain many effective ingredients such as tea protein, tea polyphenols, tea polysaccharides, caffeine, tea saponins, B-aminobutyric acid, theanine, tea pigments, etc., especially tea polyphenols, which have high efficient antibacterial effects, can scavenge free radicals, and exert antioxidant effects.

[0071] In the present invention, the tea leaf extract can be prepared by the following method, but is not limited thereto:

[0072] Take 10g of tea leaves (commercially available) and soak them in 200mL of 50% ethanol aqueous solution, soak them in a warm water bath at 55℃ for 2h, and then use a rotary evaporator to distill under reduced pressure to fully evaporate the ethanol.

[0073] Bitter Melon Extract:

[0074] Bitter melon is an edible vegetable that is widely cultivated in both northern and southern my country. It tastes sweet and bitter, but has extremely high nutritional value. For example, the pulp is not only rich in vitamins, but also contains trace elements that are beneficial to the human body. Its edible value is among the best in all kinds of fruits and vegetables. Modern experimental results have found that bitter melon also has certain medicinal value, mainly in terms of lowering blood sugar, anti-cancer, anti-bacteria, anti-filterable pathogens, improving immunity, as well as anti-oxidation and anti-aging.

[0075] In the present invention, the bitter melon extract can be prepared by the following method, but is not limited thereto:

[0076] Prepare an appropriate amount of bitter melon dry powder, put it in 70% ethanol according to a solid-liquid ratio of 1:30, then reflux in a 60°C water bath for continuous extraction for 4 hours, take the supernatant, and obtain the bitter melon extract.

[0077] Dandelion Extract:

[0078] Dandelion (Taraxacumofficinale), belonging to the genus Taraxacum of the Asteraceae family, is a perennial herb that is mainly distributed in temperate regions of the northern and southern hemispheres. It is native to Europe and is distributed in Northeast my country, North China, Northwest China, Central China, and Southwest China. The main chemical components of dandelion include polysaccharides, flavonoids, triterpenes, sesquiterpenoid lactones, organic acids, coumarins, volatile oils, and other substances. It has biological functions such as anti-oxidation, anti-bacterial and anti-inflammatory, liver protection and gallbladder promotion, blood sugar reduction, anti-tumor, and immunity enhancement.

[0079] In the present invention, the dandelion extract can be obtained commercially.

[0080] Pomegranate peel extract:

[0081] Pomegranate peel, as a traditional Chinese medicine, tastes sour and astringent, and is warm in nature.

[0082] In the present invention, the pomegranate peel extract can be prepared by the following method, but is not limited thereto:

[0083] The pomegranate peel was dried in the sun, crushed and passed through a 20-mesh sieve, extracted with 60% ethanol solvent at 45°C and 60Hz ultrasonic wave for 30min, filtered under reduced pressure and freeze-dried to obtain the pomegranate peel extract.

[0084] Honeysuckle extract

[0085] Lonicerae Flos is a commonly used Chinese herbal medicine belonging to the Caprifoliaceae family. It is widely planted throughout my country, mainly in the southern provinces of my country. Lonicerae Flos and honeysuckle were once classified as the same category, until the Chinese Pharmacopoeia in 2005 distinguished the two categories, and only the buds or early flowers of the honeysuckle plant of the Caprifoliaceae family were called honeysuckle. Lonicerae Flos is the bud or early flower of the gray felt honeysuckle, red gland honeysuckle, South China honeysuckle or yellow-brown honeysuckle. In traditional Chinese medicine, Lonicerae Flos buds are generally used as heat-clearing, anti-inflammatory and analgesic drugs.

[0086] In the present invention, the honeysuckle extract can be prepared by the following method, but is not limited thereto:

[0087] Weigh 20 g of dry honeysuckle powder that has been crushed in a Chinese herbal medicine grinder, sieved and defatted with petroleum ether for 12 hours, extract under the conditions of a solid-liquid ratio of 1:20 (g / mL), a microwave power of 400 W, an ethanol concentration of 60%, and an extraction time of 8 min, filter, and concentrate the filtrate under reduced pressure to an extract. After adding an appropriate amount of water to mix, extract with petroleum ether, ethyl acetate, and n-butanol in succession to obtain a petroleum ether phase, an ethyl acetate phase, an n-butanol phase and an aqueous phase. After reduced pressure concentration, dry to obtain a honeysuckle extract.

[0088] In the present invention, the product obtained by directly drying the extract obtained for the first time can be used as the honeysuckle extract.

[0089] In some embodiments, the fragrance layer and the adsorption layer may further include beeswax, and the weight percentage of the beeswax may be 5%-15% based on the total weight of the fragrance layer; the weight percentage may be 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14% or 15%, but not limited thereto. Based on the total weight of the adsorption layer, the weight percentage of the beeswax may be 0.5%-3%; the weight percentage may be 0.5%, 1%, 1.5%, 2%, 2.5% or 3%, but not limited thereto.

[0090] Green persimmon resources are abundant, but the utilization rate is very low, resulting in serious waste of resources; and passion fruit shells are discarded as waste, resulting in great waste of resources; the present invention makes full use of these two resources.

[0091] In some embodiments, the activated carbon and nano silver oxide used in the present invention can be obtained commercially, wherein in the deodorizing layer, the mass ratio of activated carbon to nano silver oxide is selected from 100:(0.2-2), preferably 100:1.

[0092] The present invention also provides a method for preparing an air purifier, the method comprising the following steps:

[0093] Step 1: preparing the first carrier and the second carrier by a high internal phase emulsion template method;

[0094] Step 2: Add the first carrier, natural plant essential oil, sodium citrate, green persimmon extract, citrus grandis extract, jujube seed extract, papaya extract, and passion fruit shell extract into the reactor according to weight; stir at room temperature for 1-3 hours to obtain a fragrance layer;

[0095] Step 3: Add the second carrier, tea leaf extract, bitter melon extract, dandelion extract, pomegranate peel extract and honeysuckle extract into the reactor according to weight; stir at room temperature for 1-3 hours, and dry to obtain an adsorption layer;

[0096] Step 4: Add activated carbon and nano silver oxide into the reactor according to weight, mix well, and obtain a deodorizing layer;

[0097] Step 5: Pour the deodorizing layer, the adsorption layer and the fragrance layer into the mold in order to obtain the livestock and poultry house air purifier.

[0098] High internal phase emulsion:

[0099] High internal phase emulsion (HIPE) refers to a kind of paste-like emulsion with high viscosity and a dispersed phase (internal phase) volume fraction greater than 74.05%, so it is also called highly concentrated emulsion, gel emulsion, etc. It is a metastable emulsion system composed of immiscible continuous phase and dispersed phase under the action of active agent. Ordinary emulsions are thermodynamically unstable, and spherical droplets are distributed in the continuous phase (external phase) in an isolated form. When the volume fraction of the internal phase reaches 74.05%, the dispersed phase droplets will be densely stacked to form interconnected spheres. When the volume fraction of the dispersed phase is further increased, the spherical droplets will be squeezed, stacked, and deformed. Finally, it gradually changes to a polyhedral shape separated by a continuous phase film and more tightly aggregated. This polyhedral shape gives PolyHIPE the advantages of high specific surface area, high porosity, light weight, and adjustable pore volume. When the dispersed phase volume fraction of high internal phase emulsion is too large, the droplets are more likely to aggregate and demulsify during flow, so surfactants are required to diffuse rapidly at the oil-water interface to reduce the free energy of the interface, form a strong interfacial film, and stabilize the high internal phase emulsion. High internal phase emulsion can prepare composite materials with multi-layer pore structures, and its use value and attention are increasing.

[0100] High internal phase emulsion template method:

[0101] The preparation of PolyHIPE by high internal phase emulsion template method usually uses a one-step method. Taking the preparation of oil-in-water type high internal phase emulsion as an example, the process is: add the water phase or electrolyte aqueous solution dropwise to the continuous phase composed of the completely dissolved oil phase monomer, crosslinker, activator and initiator, and then generate a high internal phase emulsion through stirring and other processes. Finally, the dispersed phase is extracted after polymerization, and the PolyHIPE can be obtained by drying. The appearance morphology and mechanical properties of porous materials can be more effectively and reasonably controlled by changing the type and content of the activator, the volume fraction of the dispersed phase, the porogen and the oily properties. Usually, the main types of PolyHIPE are water-in-oil (O / W), oil-in-water (W / O) and water-in-supercritical CO2 (scCO2 / W).

[0102] Surfactants used in high internal phase emulsion template method:

[0103] In the high internal phase emulsion system, the surfactant is one of the indispensable components for stabilizing the emulsion and preparing porous polymers, and the type and amount of the surfactant are closely related to the preparation of a stable high internal phase emulsion and the morphology and pore structure of the PolyHIPE obtained after polymerization, extraction and drying. Commonly used surfactants are span and tween surfactants, such as Span 60 and Span 80. When the concentration of the surfactant (such as Span 80) is less than 5%, the internal phase volume fraction of the obtained high internal phase emulsion is low and the stability is poor. PolyHIPE is a closed hole, and the water phase is not easy to remove from the inside of the structure, resulting in a high density of the material. As the emulsifier concentration increases to 7%-10%, a stable high internal phase emulsion can be obtained, and PolyHIPE has a smaller through-open pore structure. The further the concentration of the emulsifier is increased, the higher the internal phase volume fraction of the high internal phase emulsion, and the more densely the droplets are stacked.

[0104] Internal phase volume fraction of high internal phase emulsion template method:

[0105] In a high internal phase emulsion system, keeping other conditions unchanged and increasing the volume fraction of the dispersed phase, on the one hand, the number of activator molecules on the surface of a unit emulsion droplet will decrease, that is, the content of the activator on the internal phase droplet will gradually decrease, and the droplets will inevitably aggregate to maintain the stability of the high internal phase emulsion, so the droplet diameter becomes larger, and the resulting PolyHIPE pores also become larger accordingly, and the size distribution becomes wider. On the other hand, the droplets are squeezed more tightly, and the thickness of the liquid film separating the continuous phase containing the monomer becomes thinner, so the window pore size increases after polymerization and it is easier to form a mutually interpenetrating pore structure.

[0106] Oil phase fraction of high internal phase emulsion template method:

[0107] The prerequisite for producing high internal phase emulsion is that the water and oil phases must be immiscible, and the continuous phase monomer must have high hydrophobicity. Styrene is insoluble in water and has high hydrophobicity. Therefore, polystyrene-based porous materials prepared with styrene monomers are currently the most widely studied and most complete porous materials.

[0108] The specific preparation process of the polystyrene microspheres involved in the present invention is as follows:

[0109] According to the mass ratio, monomer St, crosslinking agent DVB, emulsifier Span 80 and 1.67% BPO were weighed in a 250mL three-necked flask, fully mixed under ultrasonic action, and CaCl2 (1wt%) aqueous solution was added dropwise to the oil phase using a constant pressure funnel while maintaining a mechanical stirring rate of 400r / min. After the addition was completed, the mixture was quickly stirred and mixed, and then a digital high-speed dispersion homogenizer was used to further stir for 10 minutes until a white, high-viscosity and uniform high-internal phase emulsion was formed, and then transferred to a glass tube mold with a diameter of 15mm for sealing, and then placed in a constant temperature water bath at 70°C for polymerization. After the reaction was completed for 24 hours, the mold was removed to obtain a white cylindrical porous block material, which was the first carrier and the second carrier used in the present invention. The present invention can also prepare polystyrene microspheres with different porosities and specific surface areas by adjusting the amount of Span 80.

[0110] The present invention is further described below by way of specific examples. The various chemical reagents used in the examples of the present invention are obtained through conventional commercial channels unless otherwise specified. Unless otherwise specified, the contents described below are all weight contents. Unless otherwise specified, it is understood that the process is carried out at room temperature.

[0111] Embodiment 1:

[0112] Embodiment 1 comprises the following steps:

[0113] 1) Monomer St, crosslinking agent DVB, emulsifier Span 80 and 1.67% BPO were weighed in a 250 mL three-necked flask according to the mass ratio, wherein the emulsifier Span 80 accounted for 20wt% of the monomer St, and the crosslinking agent DVB accounted for 40wt% of the monomer St. The mixture was fully mixed under ultrasonic action, and a CaCl2 (1wt%) aqueous solution was added dropwise to the oil phase using a constant pressure funnel while maintaining a mechanical stirring rate of 400 r / min, wherein the volume fraction of the inner phase was 80%. After the addition is completed, the mixture is stirred quickly and then further stirred for 10 minutes using a digital high-speed dispersing homogenizer until a white, high-viscosity and uniform high internal phase emulsion is formed, and then transferred to a glass tube mold with a diameter of 15 mm for sealing, and then placed in a constant temperature water bath at 70°C for polymerization. After 24 hours of reaction, the mold is removed to obtain a white cylindrical porous block material. The porous block material is dispersed to obtain the first carrier used in Example 1. The porosity of the first carrier in Example 1 is 91%, and the specific surface area is 24m 2 / g, particle size is 25-75μm, such as Figure 1 shown.

[0114] 2) Monomer St, crosslinking agent DVB, emulsifier Span 80 and 1.67% BPO were weighed in a 250 mL three-necked flask according to the mass ratio, wherein the emulsifier Span 80 accounted for 30 wt % of the monomer St, and the crosslinking agent DVB accounted for 40 wt % of the monomer St. The mixture was fully mixed under ultrasonic action, and a CaCl2 (1 wt %) aqueous solution was added dropwise to the oil phase using a constant pressure funnel while maintaining a mechanical stirring rate of 400 r / min, wherein the volume fraction of the inner phase was 80%. After the addition is completed, the mixture is quickly stirred and mixed, and then a digital high-speed dispersing homogenizer is used to further stir for 10 minutes until a white, high-viscosity and uniform high internal phase emulsion is formed, and then it is transferred to a glass tube mold with a diameter of 15 mm for sealing, and then placed in a constant temperature water bath at 70°C for polymerization. After the reaction is completed for 24 hours, the mold is removed to obtain a white cylindrical porous block material. After dispersing the porous block material, the second carrier used in Example 1 is obtained. The porosity of the second carrier in Example 1 is 75%, and the specific surface area is 33m 2 / g, particle size is 25-75μm.

[0115] 3) adding the first carrier and the first plant extract into the reactor at a weight ratio of 1:0.4, wherein the first plant extract comprises 2.5 parts of green persimmon extract, 1.5 parts of citrus grandis extract, 1.2 parts of spiny jujube seed extract, 0.8 parts of papaya extract and 5 parts of passion fruit shell extract; stirring at room temperature for 2 hours;

[0116] 4) adding a second carrier and a second plant extract into the reactor at a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract comprises 1.2 parts of tea leaf extract, 1.5 parts of bitter melon extract, 1.2 parts of dandelion extract, 1.2 parts of pomegranate peel extract and 3.5 parts of honeysuckle extract, and stirring at room temperature for 2 hours;

[0117] 5) mixing the activated carbon and the nano silver oxide in a weight ratio of 100:1; the total weight of the activated carbon and the nano silver oxide is the same as twice the total weight of the first carrier and the first plant extract;

[0118] 6) The products obtained in 3), 4) and 5) are poured into a mold in order to obtain the air purifier of Example 1, which is provided with a fragrance layer, an adsorption layer and a deodorization layer in order from top to bottom.

[0119] Embodiment 2:

[0120] 1) Monomer St, crosslinking agent DVB, emulsifier Span 80 and 1.67% BPO were weighed in a 250 mL three-necked flask according to the mass ratio, wherein the emulsifier Span 80 accounted for 20wt% of the monomer St, and the crosslinking agent DVB accounted for 40wt% of the monomer St. The mixture was fully mixed under ultrasonic action, and a CaCl2 (1wt%) aqueous solution was added dropwise to the oil phase using a constant pressure funnel while maintaining a mechanical stirring rate of 400 r / min, wherein the volume fraction of the inner phase was 80%. After the addition is completed, the mixture is stirred quickly and then further stirred for 10 minutes using a digital high-speed dispersing homogenizer until a white, high-viscosity and uniform high internal phase emulsion is formed, and then transferred to a glass tube mold with a diameter of 15 mm for sealing, and then placed in a constant temperature water bath at 70°C for polymerization. After 24 hours of reaction, the mold is removed to obtain a white cylindrical porous block material. After dispersing the porous block material, the first carrier used in Example 2 is obtained. The porosity of the first carrier in Example 2 is 91%, and the specific surface area is 24m 2 / g, particle size is 25-75μm.

[0121] 2) Monomer St, crosslinking agent DVB, emulsifier Span 80 and 1.67% BPO were weighed in a 250 mL three-necked flask according to the mass ratio, wherein the emulsifier Span 80 accounted for 30 wt % of the monomer St, and the crosslinking agent DVB accounted for 40 wt % of the monomer St. The mixture was fully mixed under ultrasonic action, and a CaCl2 (1 wt %) aqueous solution was added dropwise to the oil phase using a constant pressure funnel while maintaining a mechanical stirring rate of 400 r / min, wherein the volume fraction of the inner phase was 80%. After the addition is completed, the mixture is stirred quickly and then further stirred for 10 minutes using a digital high-speed dispersing homogenizer until a white, high-viscosity and uniform high internal phase emulsion is formed, and then transferred to a glass tube mold with a diameter of 15 mm for sealing, and then placed in a constant temperature water bath at 70°C for polymerization. After 24 hours of reaction, the mold is removed to obtain a white cylindrical porous block material. The porous block material is dispersed to obtain the second carrier used in Example 2. The porosity of the second carrier in Example 2 is 75%, and the specific surface area is 33m 2 / g, particle size is 25-75μm.

[0122] 3) adding the first carrier and the first plant extract into the reactor at a weight ratio of 1:0.4, wherein the first plant extract comprises 2.5 parts of green persimmon extract, 1.5 parts of citrus grandis extract, 1.2 parts of spiny jujube seed extract, 0.8 parts of papaya extract and 5 parts of passion fruit shell extract; stirring at room temperature for 2 hours;

[0123] 4) adding a second carrier and a second plant extract into the reactor at a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract comprises 1.5 parts of tea leaf extract, 1.5 parts of bitter melon extract, 1.5 parts of dandelion extract, 1.5 parts of pomegranate peel extract and 3.5 parts of honeysuckle extract, and stirring at room temperature for 2 hours;

[0124] 5) mixing the activated carbon and the nano silver oxide in a weight ratio of 100:1; the total weight of the activated carbon and the nano silver oxide is the same as twice the total weight of the first carrier and the first plant extract;

[0125] 6) Pour the products obtained in 3), 4) and 5) into a mold in order to obtain the air purifier of Example 2.

[0126] Embodiment 3:

[0127] 1) Monomer St, crosslinking agent DVB, emulsifier Span 80 and 1.67% BPO were weighed in a 250 mL three-necked flask according to the mass ratio, wherein the emulsifier Span 80 accounted for 20wt% of the monomer St, and the crosslinking agent DVB accounted for 40wt% of the monomer St. The mixture was fully mixed under ultrasonic action, and a CaCl2 (1wt%) aqueous solution was added dropwise to the oil phase using a constant pressure funnel while maintaining a mechanical stirring rate of 400 r / min, wherein the volume fraction of the inner phase was 80%. After the addition is completed, the mixture is quickly stirred and mixed, and then a digital high-speed dispersing homogenizer is used to further stir for 10 minutes until a white, high-viscosity and uniform high internal phase emulsion is formed, and then it is transferred to a glass tube mold with a diameter of 15 mm for sealing, and then placed in a constant temperature water bath at 70°C for polymerization. After the reaction is completed for 24 hours, the mold is removed to obtain a white cylindrical porous block material. After dispersing the porous block material, the first carrier used in Example 3 is obtained. The porosity of the first carrier in Example 3 is 91%, and the specific surface area is 24m 2 / g, particle size is 25-75μm.

[0128] 2) Monomer St, crosslinking agent DVB, emulsifier Span 80 and 1.67% BPO were weighed in a 250 mL three-necked flask according to the mass ratio, wherein the emulsifier Span 80 accounted for 30 wt % of the monomer St, and the crosslinking agent DVB accounted for 40 wt % of the monomer St. The mixture was fully mixed under ultrasonic action, and a CaCl2 (1 wt %) aqueous solution was added dropwise to the oil phase using a constant pressure funnel while maintaining a mechanical stirring rate of 400 r / min, wherein the volume fraction of the inner phase was 80%. After the addition is completed, the mixture is quickly stirred and mixed, and then a digital high-speed dispersing homogenizer is used to further stir for 10 minutes until a white, high-viscosity and uniform high internal phase emulsion is formed, and then it is transferred to a glass tube mold with a diameter of 15 mm for sealing, and then placed in a constant temperature water bath at 70°C for polymerization. After the reaction is completed for 24 hours, the mold is removed to obtain a white cylindrical porous block material. After dispersing the porous block material, the second carrier used in Example 3 is obtained. The porosity of the second carrier in Example 3 is 75%, and the specific surface area is 33m 2 / g, particle size is 25-75μm.

[0129] 3) adding the first carrier and the first plant extract into the reactor at a weight ratio of 1:0.4, wherein the first plant extract comprises 2.5 parts of green persimmon extract, 1.5 parts of citrus grandis extract, 1.2 parts of spiny jujube seed extract, 0.8 parts of papaya extract and 5 parts of passion fruit shell extract; stirring at room temperature for 2 hours;

[0130] 4) adding a second carrier and a second plant extract into the reactor at a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract comprises 1 part of tea leaf extract, 2 parts of bitter melon extract, 1 part of dandelion extract, 1.5 parts of pomegranate peel extract and 3.5 parts of honeysuckle extract, and stirring at room temperature for 2 hours;

[0131] 5) The activated carbon and the nano silver oxide are uniformly mixed in a weight ratio of 100:1; the total weight of the activated carbon and the nano silver oxide is the same as twice the total weight of the first carrier and the first plant extract.

[0132] 6) Pour the products obtained in 3), 4) and 5) into a mold in order to obtain the air purifier of Example 3.

[0133] Embodiment 4:

[0134] The steps of Example 4 are the same as those of Example 1, except that, in 4):

[0135] The second carrier and the second plant extract are added into the reactor in a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract comprises 0.5 parts of tea leaf extract, 2 parts of bitter melon extract, 0.5 parts of dandelion extract, 2 parts of pomegranate peel extract and 3 parts of honeysuckle extract, and stirred at room temperature for 2 hours.

[0136] Embodiment 5:

[0137] The steps of Example 5 are the same as those of Example 1, except that in 4):

[0138] The second carrier and the second plant extract are added into the reactor in a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract comprises 2 parts of tea leaf extract, 2 parts of bitter melon extract, 1.5 parts of dandelion extract, 1.5 parts of pomegranate peel extract and 3.5 parts of honeysuckle extract, and stirred at room temperature for 2 hours.

[0139] Embodiment 6:

[0140] The steps of Example 6 are the same as those of Example 1, except that in 4):

[0141] The second carrier and the second plant extract are added into the reactor in a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract comprises 0.5 parts of tea leaf extract, 1.5 parts of bitter melon extract, 1.5 parts of dandelion extract, 1.5 parts of pomegranate peel extract and 3.5 parts of honeysuckle extract, and stirred at room temperature for 2 hours.

[0142] Embodiment 7:

[0143] The steps of Example 7 are the same as those of Example 1, except that, in 4):

[0144] The second carrier and the second plant extract are added into the reactor in a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract comprises 1.5 parts of tea leaf extract, 0.5 parts of bitter melon extract, 1.5 parts of dandelion extract, 1.5 parts of pomegranate peel extract and 3.5 parts of honeysuckle extract, and stirred at room temperature for 2 hours.

[0145] Comparative Example 1:

[0146] The steps of Comparative Example 1 are the same as those of Example 1, except that, in 4):

[0147] The second carrier and the second plant extract are added into the reactor in a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract comprises 1.5 parts of bitter melon extract, 1.2 parts of dandelion extract, 1.2 parts of pomegranate peel extract and 3.5 parts of honeysuckle extract, and stirred at room temperature for 2 hours.

[0148] Comparative Example 2:

[0149] The steps of Comparative Example 2 are the same as those of Example 1, except that, in 4):

[0150] The second carrier and the second plant extract are added into the reactor in a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract comprises 1.2 parts of tea leaf extract, 1.2 parts of dandelion extract, 1.2 parts of pomegranate peel extract and 3.5 parts of honeysuckle extract, and stirred at room temperature for 2 hours.

[0151] Comparative Example 3:

[0152] The steps of Comparative Example 3 are the same as those of Example 1, except that, in 4):

[0153] The second carrier and the second plant extract are added into the reactor in a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract comprises 1.2 parts of tea leaf extract, 1.5 parts of bitter melon extract, 1.2 parts of pomegranate peel extract and 3.5 parts of honeysuckle extract, and stirred at room temperature for 2 hours.

[0154] Comparative Example 4:

[0155] The steps of Comparative Example 4 are the same as those of Example 1, except that, in 4):

[0156] The second carrier and the second plant extract are added into the reactor in a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract comprises 1.2 parts of tea leaf extract, 1.5 parts of bitter melon extract, 1.2 parts of dandelion extract and 3.5 parts of honeysuckle extract, and stirred at room temperature for 2 hours.

[0157] Comparative Example 5:

[0158] The steps of Comparative Example 5 are the same as those of Example 1, except that, in 4):

[0159] The second carrier and the second plant extract are added into the reactor in a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract comprises 1.2 parts of tea leaf extract, 1.5 parts of bitter melon extract and 1.2 parts of dandelion extract, and stirred at room temperature for 2 hours.

[0160] Comparative Example 6:

[0161] The steps of Comparative Example 6 are the same as those of Example 1, except that, in 4):

[0162] The second carrier and the second plant extract are added into the reactor at a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract only contains honeysuckle extract, and stirred at room temperature for 2 hours.

[0163] Adsorption layer stability and air sterilization test:

[0164] Examples 1-7 and Comparative Examples 1-6 were subjected to stability and air sterilization experimental tests:

[0165] Stability test:

[0166] Examples 1-7 and Comparative Examples 1-6 were sealed and stored in transparent containers, respectively, and placed in a thermostat with the temperature set at 25°C and 5°C. They were stored for 90 days, and the adsorption layer was observed to see if it deteriorated. No deterioration after 90 days was recorded as excellent, deterioration after 60 to 90 days was recorded as good, deterioration after 30 to 60 days was recorded as fair, and deterioration within 30 days was recorded as poor.

[0167] Air sterilization test:

[0168] At 60m 3 In a laboratory, the products of Examples 1-7 and Comparative Examples 1-6 were placed for 30 days and then released into the air to react with natural bacteria for 48 hours. The sterilization rate = (average bacterial count before the test - average bacterial count after the test) × 100% / average bacterial count before the test.

[0169] The results of the above tests are shown in Table 1 below:

[0170] Table 1

[0171]

[0172] It can be seen that changing the content and ratio of plant extracts in the adsorption layer will have a significant impact on the stability and sterilization effect of the product.

[0173] Embodiment 8:

[0174] Embodiment 8 comprises the following steps:

[0175] 1) Monomer St, crosslinking agent DVB, emulsifier Span 80 and 1.67% BPO were weighed in a 250 mL three-necked flask according to the mass ratio, wherein the emulsifier Span 80 accounted for 30 wt % of the monomer St, and the crosslinking agent DVB accounted for 40 wt % of the monomer St. The mixture was fully mixed under ultrasonic action, and a CaCl2 (1 wt %) aqueous solution was added dropwise into the oil phase using a constant pressure funnel while maintaining a mechanical stirring rate of 400 r / min, wherein the volume fraction of the inner phase was 80%. After the addition is completed, the mixture is quickly stirred and mixed, and then a digital high-speed dispersing homogenizer is used to further stir for 10 minutes until a white, high-viscosity and uniform high internal phase emulsion is formed, and then it is transferred to a glass tube mold with a diameter of 15 mm for sealing, and then placed in a constant temperature water bath at 70°C for polymerization. After the reaction is completed for 24 hours, the mold is removed to obtain a white cylindrical porous block material. After dispersing the porous block material, the second carrier used in Example 8 is obtained. The porosity of the second carrier in Example 1 is 75%, and the specific surface area is 33m 2 / g, particle size is 25-75μm.

[0176] 2) Monomer St, crosslinking agent DVB, emulsifier Span 80 and 1.67% BPO were weighed in a 250 mL three-necked flask according to the mass ratio, wherein the emulsifier Span 80 accounted for 20wt% of the monomer St, and the crosslinking agent DVB accounted for 40wt% of the monomer St. The mixture was fully mixed under ultrasonic action, and a CaCl2 (1wt%) aqueous solution was added dropwise to the oil phase using a constant pressure funnel while maintaining a mechanical stirring rate of 400 r / min, wherein the volume fraction of the inner phase was 80%. After the addition is completed, the mixture is stirred quickly and then further stirred for 10 minutes using a digital high-speed dispersing homogenizer until a white, high-viscosity and uniform high internal phase emulsion is formed, and then transferred to a glass tube mold with a diameter of 15 mm for sealing, and then placed in a constant temperature water bath at 70°C for polymerization. After 24 hours of reaction, the mold is removed to obtain a white cylindrical porous block material. The porous block material is dispersed to obtain the first carrier used in Example 1. The porosity of the first carrier in Example 1 is 91%, and the specific surface area is 24m 2 / g, particle size is 25-75μm.

[0177] 3) adding the first carrier and the first plant extract into the reactor at a weight ratio of 1:0.4, wherein the first plant extract comprises 2.5 parts of green persimmon extract, 1.5 parts of citrus grandis extract, 1.2 parts of spiny jujube seed extract, 0.8 parts of papaya extract and 5 parts of passion fruit shell extract; stirring at room temperature for 2 hours;

[0178] 4) adding a second carrier and a second plant extract into the reactor at a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract comprises 1.2 parts of tea leaf extract, 1.5 parts of bitter melon extract, 1.2 parts of dandelion extract, 1.2 parts of pomegranate peel extract and 3.5 parts of honeysuckle extract, and stirring at room temperature for 2 hours;

[0179] 5) mixing the activated carbon and the nano silver oxide in a weight ratio of 100:1; the total weight of the activated carbon and the nano silver oxide is the same as twice the total weight of the first carrier and the first plant extract;

[0180] 6) The products obtained in 3), 4) and 5) are poured into a mold in order to obtain the air purifier of Example 8, which is provided with a fragrance layer, an adsorption layer and a deodorization layer in order from top to bottom.

[0181] Embodiment 9:

[0182] 1) adding a first carrier (nano titanium dioxide, rutile type, commercially available) and a first plant extract into a reactor at a weight ratio of 1:0.4, wherein the first plant extract comprises 2.5 parts of green persimmon extract, 1.5 parts of citrus grandis extract, 1.2 parts of jujube seed extract, 0.8 parts of papaya extract and 5 parts of passion fruit shell extract; stirring at room temperature for 2 hours;

[0183] 4) adding a second carrier (nano titanium dioxide, the same as the nano titanium dioxide in 1) and a second plant extract into the reactor at a weight ratio of 1:0.4, wherein the total weight of the second carrier and the second plant extract is the same as the total weight of the first carrier and the first plant extract; the second plant extract comprises 1.2 parts of tea leaf extract, 1.5 parts of bitter melon extract, 1.2 parts of dandelion extract, 1.2 parts of pomegranate peel extract and 3.5 parts of honeysuckle extract, and stirring at room temperature for 2 hours;

[0184] 5) mixing the activated carbon and the nano silver oxide in a weight ratio of 100:1; the total weight of the activated carbon and the nano silver oxide is the same as twice the total weight of the first carrier and the first plant extract;

[0185] 6) The products obtained in 1), 2) and 3) are poured into a mold in order to obtain the air purifier of Example 9, which is provided with a fragrance layer, an adsorption layer and a deodorization layer in order from top to bottom.

[0186] Embodiment 10:

[0187] The steps of Example 10 are the same as those of Example 9, except that nano-titanium dioxide is replaced by mesoporous silica microspheres (0.2-1.5 μm).

[0188] Comparative Example 7:

[0189] The steps of Comparative Example 7 are the same as those of Example 9, except that Comparative Example 7 does not include the first carrier and the second carrier.

[0190] Stability of adsorption layer and air sterilization test:

[0191] Examples 8-10 and Comparative Example 7 were subjected to stability and air sterilization test, the test steps were as described above, and the test results are shown in Table 2 below:

[0192] Table 2

[0193]

[0194]

[0195] It can be seen that changing the material, porosity and specific surface area of ​​the first carrier and the second carrier will affect the stability and sterilization effect of the product.

[0196] Embodiment 11:

[0197] The steps of Example 11 are the same as those of Example 1, except that in 3):

[0198] 3) adding the first carrier and the first plant extract into the reactor in a weight ratio of 1:0.4, wherein the first plant extract comprises 2.5 parts of green persimmon extract, 1.5 parts of citrus grandis extract, 4 parts of spiny jujube kernel extract, 2 parts of papaya extract and 5 parts of passion fruit shell extract; stirring at room temperature for 2 hours.

[0199] Embodiment 12:

[0200] The steps of Example 12 are the same as those of Example 1, except that in 3):

[0201] 3) adding the first carrier and the first plant extract into the reactor in a weight ratio of 1:0.4, wherein the first plant extract comprises 2.5 parts of green persimmon extract, 1.5 parts of citrus grandis extract, 1.2 parts of spiny jujube kernel extract, 0.8 parts of papaya extract and 0.8 parts of passion fruit shell extract; stirring at room temperature for 2 hours.

[0202] Comparative Example 8:

[0203] The steps of Comparative Example 8 are the same as those of Example 1, except that, in 3):

[0204] 3) adding the first carrier and the first plant extract into the reactor at a weight ratio of 1:0.4, wherein the first plant extract comprises 1.5 parts of Cirsium junceum extract, 1.2 parts of Ziziphus jujuba seed extract, 0.8 parts of Papaya extract and 5 parts of Passion fruit shell extract; stirring at room temperature for 2 hours.

[0205] Comparative Example 9:

[0206] The steps of Comparative Example 9 are the same as those of Example 1, except that, in 3):

[0207] 3) adding the first carrier and the first plant extract into the reactor at a weight ratio of 1:0.4, wherein the first plant extract comprises 2.5 parts of green persimmon extract, 1.5 parts of Cirsium japonicum extract, 1.2 parts of Ziziphus jujuba seed extract and 0.8 parts of papaya extract; stirring at room temperature for 2 hours.

[0208] Stability test of fragrance layer:

[0209] Examples 1, 11-12 and Comparative Examples 8-9 were sealed and stored in transparent containers, respectively, and placed in a thermostat, the temperature of the thermostat was set at 25°C and 5°C, and stored for 50 days to observe whether the fragrance layer deteriorated. No deterioration after 50 days was recorded as excellent, deterioration from 30 to 50 days was recorded as good, deterioration from 15 to 30 days was recorded as fair, and deterioration within 15 days was recorded as poor. The test results are shown in Table 3 below:

[0210] Table 3

[0211] Example Stability at 25℃ 5℃ stability Example 1 Excellent Excellent Embodiment 11 good good Example 12 good good Comparative Example 8 Difference generally Comparative Example 9 Difference Difference

[0212] It can be seen from the above data that the livestock and poultry house air purifier provided by the present invention has excellent bactericidal and sterilizing performance against Salmonella, Escherichia coli, and Streptococcus, and has stable properties and can produce a lasting fresh effect on the ambient air.

Claims

1. An air purifier for livestock and poultry sheds, It is characterized in that The livestock and poultry house air purifier is provided with a fragrance layer, an adsorption layer and a deodorization layer in sequence from top to bottom, wherein; The fragrance layer comprises a first carrier and a first plant extract; the first plant extract comprises green persimmon extract, citrus grandis extract, jujube kernel extract, papaya extract and passion fruit shell extract; The adsorption layer includes a second carrier and a second plant extract; the second plant extract includes a tea leaf extract, a bitter melon extract, a dandelion extract, a pomegranate peel extract and a honeysuckle extract; The deodorizing layer comprises activated carbon and nano silver oxide.

2. The air purifier for livestock and poultry sheds according to claim 1, It is characterized in that The first carrier and the second carrier are polystyrene microspheres with a diameter of 10-100 μm.

3. The livestock and poultry house air purifier according to claim 2, It is characterized in that The porosity of the first carrier is selected from 80% to 93%, and the specific surface area of ​​the first carrier is selected from 16 to 26 m 2 / g.

4. The air purifier for livestock and poultry sheds according to claim 2, It is characterized in that The porosity of the second carrier is selected from 65% to 79%, and the specific surface area of ​​the first carrier is selected from 20 to 35 m 2 / g.

5. The air purifier for livestock and poultry houses according to claim 1, It is characterized in that The weight ratio of the first carrier to the first plant extract is selected from 1:(0.2-0.5).

6. The air purifier for livestock and poultry sheds according to claim 1, It is characterized in that Calculated by weight, the fragrance layer includes 1-3 parts of green persimmon extract, 1-5 parts of citrus grandis extract, 1-3 parts of spiny jujube kernel extract, 0.5-1 parts of papaya extract and 1-10 parts of passion fruit shell extract.

7. The air purifier for livestock and poultry sheds according to claim 6, It is characterized in that Calculated by weight, the fragrance layer includes 2.5 parts of green persimmon extract, 1.5 parts of citrus grandis extract, 1.2 parts of spiny jujube kernel extract, 0.8 parts of papaya extract and 5 parts of passion fruit shell extract.

8. The air purifier for livestock and poultry sheds according to claim 1, It is characterized in that The weight ratio of the second carrier to the second plant extract is selected from 1:(0.3-0.7).

9. The air purifier for livestock and poultry sheds according to claim 1, It is characterized in that Calculated by weight, the adsorption layer includes 1-3 parts of tea leaf extract, 1-3 parts of bitter melon extract, 1-2 parts of dandelion extract, 1-3 parts of pomegranate peel extract and 3-5 parts of honeysuckle extract.

10. The livestock and poultry house air purifier according to claim 9, It is characterized in that Calculated by weight, the adsorption layer includes 1-1.5 parts of tea leaf extract, 1-2 parts of bitter melon extract, 1-1.5 parts of dandelion extract, 1-1.5 parts of pomegranate peel extract and 3-4 parts of honeysuckle extract.

11. The air purifier for livestock and poultry sheds according to claim 10, It is characterized in that Calculated by weight, the adsorption layer includes 1.2 parts of tea leaf extract, 1.5 parts of bitter melon extract, 1.2 parts of dandelion extract, 1.2 parts of pomegranate peel extract and 3.5 parts of honeysuckle extract.

12. The livestock and poultry house air purifier according to claim 1, It is characterized in that The weight ratio of the adsorption layer to the deodorization layer is selected from 1:(1.2-2.5).

13. The livestock and poultry house air purifier according to claim 1, It is characterized in that The weight ratio of the adsorption layer, the deodorization layer and the fragrance layer is selected from 1:(1.2-2.5):(0.5-1.5).

14. The livestock and poultry house air purifier according to claim 2 or 3, It is characterized in that The polystyrene microspheres are prepared by a high internal phase emulsion template method.

15. A method for preparing the livestock and poultry house air purifier according to any one of claims 1 to 14, It is characterized in that The method comprises the following steps: Step 1: preparing the first carrier and the second carrier by a high internal phase emulsion template method; Step 2: Add the first carrier, natural plant essential oil, sodium citrate, green persimmon extract, citrus grandis extract, jujube seed extract, papaya extract, and passion fruit shell extract into the reactor according to weight; stir at room temperature for 1-3 hours to obtain a fragrance layer; Step 3: Add the second carrier, tea leaf extract, bitter melon extract, dandelion extract, pomegranate peel extract and honeysuckle extract into the reactor according to weight; stir at room temperature for 1-3 hours, and dry to obtain an adsorption layer; Step 4: Add activated carbon and nano silver oxide into the reactor according to weight, mix well, and obtain a deodorizing layer; Step 5: Pour the deodorizing layer, the adsorption layer and the fragrance layer into the mold in order to obtain the livestock and poultry house air purifier.

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