141results about How to "Extended protection time" patented technology

The invention discloses an anti-mosquito finishing process of a textile fabric. The textile fabric is cotton, tencel, modal, blended cotton (viscose cotton, polyester cotton, polyamide cotton), silk, a wool cotton dyed fabric, a thin chemical fiber fabric, a pair of socks, a mosquito net and the like. The process comprises the steps of: selecting a mosquito repellent and a low-temperature fixative, carrying out nano microencapsulation on the mosquito repellent by utilizing a microencapsulation technology, carrying out anti-mosquito finishing on a textile fabric to form an anti-mosquito emulsion through the low-temperature fixative, dehydrating and curing to finally obtain the anti-mosquito finished fabric. The anti-mosquito fabric fabricated by the anti-mosquito finishing process has a fast mosquito killing function, a repelling rate of the anti-mosquito finishing process on aedes albopicus, culex pipiens pallens and the like is higher than 90 percent and an anti-biting rate of the anti-mosquito finishing process is 100 percent; the anti-mosquito fabric does not have bad influence on physical indices such as appearance, strength, moisture absorbing property and the like of the fabric; the anti-mosquito fabric has a good anti-mosquito effect after being washed 15 times; and the anti-mosquito finished fabric does not stimulate or cause allergy to skin, is safe and non-toxic to a human body, and is comfortable to wear.

The invention discloses a rust-proof soft film composition and a preparation method thereof, belonging to the technical field of metal protection and particularly relating to a metal rust preventing technology. The rust-proof soft film composition disclosed by the invention comprises the following components in a formula in percentage by mass: 40-70 of film forming agent, 2-10 of corrosion and rust inhibitor, 1-5 of vapor phase inhibitor, 4-10 of microcapsule antirust agent, 0-10 of pigment, 1-3 of rheological agent, 0.2-1.0 of defoaming agent and 10-25 of solvent. The rust-proof soft film composition disclosed by the invention has an excellent rust-proof effect and an excellent self-repairing function; rust-proof gas volatilized by the film can meet the rust-proof requirements of inner and outer surfaces of workpieces with complex structures such as inner metal cavities, inner walls of pipelines, grooves and the like; when the rust-proof soft film is destroyed in a use process, a rust-proof core with an excellent self-repairing function of the microcapsule antirust agent can be automatically repaired, so that the condition that the rust-proof film is invalid in advance because of being destroyed is avoided, and the protection time of a protective film is prolonged; and the rust-proof soft film composition can comprehensively meet the requirement for metal rust-proof protection under severe environments such as outdoor sun and rain, sand-dust and the like.

The invention relates to a process for preparing a rust-bearing rust-proof heavy-duty coating and belongs to the technical field of rust-bearing rust-proof heavy-duty coating preparation. The process comprises the following steps: 1) stirring; 2) grinding; 3) dispersing; 4) preparing a resin; 5) preparing the coating; and 6) stirring. The production process is simple and quick, and the produced coating has high permeability, high solid content and low viscosity and can passivate active and harmful iron compounds in a rust layer into harmless fillers.

The invention belongs to the technical field of environmental remediation and the field of microbial immobilization and particularly relates to a preparation method and an application of a biochar-based carrier modified through high-temperature alkalization. The preparation method is characterized in that by means of the steps of drying and smashing of biomass materials, pyrolysis, cooling, acidification and alkalization as well as controlled etching processing for pore channels in biochar, the pore channel structure in the biochar is beneficial to microbial growth and metabolism, and the biochar whose surface is modified with a high-temperature alkaline solution is used for preparing a carbon-based immobilized microbial agent. According to the preparation method, the biochar is prepared from the biomass materials such as straw and corncob, the pore diameter and length of gaps in the prepared biochar-based carrier are controlled precisely through controlled etching of the pore channels in the biochar, so that the pore channel structure in the biochar is beneficial to microbial growth and metabolism, finally, the biochar subjected to surface modification can be used for preparing the carbon-based immobilized microbial agent, and the biochar-based carrier is used for remediating petroleum hydrocarbon contaminated soil and treating agricultural waste.

The invention discloses a microcapsule type additive for corrosion-resistant coating and a preparation method thereof. The microcapsule type additive is prepared by the following components by weight percent, 40wt-80wt% of water, 5wt%-35wt% of air-drying type film-forming substance, 0.01wt%-10wt% of anti-rusting agent, 5wt%-30wt% of capsule-wall resin and 0.05wt%-2wt% of emulsifying agent; the mixture of the air-drying film-forming substance and the anti-rusting agent is wrapped in the capsule-wall resin which is urea resin, melamine-formaldehyde resin or modified polymer of the urea resin and melamine-formaldehyde resin or mixture of two or more than two substances. The additive disclosed by the invention has the advantages that the additive is added into the corrosion-resistant coating, the corrosion resistance of the prepared coating can be further improved, especially when the paint film is damaged due to action of external force, the added additive can release a restoration agent and the anti-rusting agent to restore the damage and inhibit the corrosion expansion by self, so that the service life of the paint film is prolonged.

The invention relates to the field of in-vitro diagnosis biochemical reagents, particularly a high-stability creatine kinase detection kit. The high-stability creatine kinase detection kit is composed of a reagent R1 and a reagent R2 which are mutually independent, wherein the reagent R1 is composed of a biological buffer solution, an enzyme protective agent, a reaction substrate, a complex, a surfactant, a preservative and an activator; the reagent R2 is composed of a biological buffer solution, a reaction substrate and a preservative; and the volume ratio of the reagent R1 to the reagent R2 is 4:1. After adding the enzyme protective agent into the detection kit, the enzyme protective agent can be adopted to protect the enzyme on the premise of enhancing the stability of the reagent. After adding the enzyme protective agent, the enzyme can keep stable in the water solution for a long time, and the activity of the enzyme is not influenced.

The invention discloses an oxygen-functionalized carbon material and uses of the same, and belongs to the technical field of adsorbent. The invention is characterized in that the oxygen-functionalized carbon material is prepared by oxidative modification of hydrogen peroxide or ultrasonic-assisted hydrogen peroxide; the number of oxygen-containing functional groups on the surface of the carbon material after the oxidative modification of the hydrogen peroxide is obviously increased, but the pore structure and the strength of the carbon material are basically kept unchanged; the adsorption capacity of the oxygen-functionalized carbon material on metallic ions such as Ag, Cu and Cr is greatly improved compared with a raw material carbon; and when an impregnated carbon catalyst prepared by infusing the oxygen-functionalized carbon material is used for protecting cyan chloride, the protection time of the impregnated carbon catalyst is improved by 20 to 30 percent under the same preparation condition compared with the raw material carbon. The oxygen-functionalized carbon material prepared by the oxidative modification of the hydrogen peroxide or the ultrasonic-assisted hydrogen peroxide has the advantages of simple process, quickness, environmental protection, and the like, and provides an effective carbon carrier for the impregnated carbon catalyst for protecting the cyan chloride.

A container for receiving moisture sensitive goods includes a container body (15) and a cap (26) shaped to establish a leak-proof seal between the container body and the cap. The container body has a base and a sidewall with an insert element present inside the container body having a bottom and an insert sidewall, wherein an outer circumferential surface of the insert sidewall is in contact with an inner circumferential surface of the sidewall of the container body. The bottom of the insert element is permeable to moisture and the insert sidewall and the sidewall of the container body are designed to attach the insert element inside the container body. In addition, the container has a desiccant chamber between the bottom of the insert element and the base of the container body for receiving desiccant material.

The invention provides a low temperature resistant winter epoxy coal tar pitch coating comprising a component A and a component B according to a weight ratio of 5-7:1. The component A is prepared from an epoxy resin, coal tar pitch, a dispersing agent, flatting agents, barium sulfate, a talcum powder, bentonite, and solvents in parts by weight; the component B comprises polyamide and xylene according to a weight ratio of 1:1. With combination of the epoxy resin and the coal tar pitch, not only excellent film-forming and corrosion resistance properties of the epoxy resin are exerted, but also the problems of high temperature flow and low temperature cold brittleness of a pitch material are better solved, the coating layer is resistant to low temperature and can be used in winter, and the service life of the coating is prolonged.

This invention provided a Mg alloy glass covering flux and its production method. The mass percentage sphere of the flux chemical composition is: MgCl 45-65%, KCL10-22%, NaCl10-22%, CaCl2 2-10%, CaF3-10%, MgO2-8%, cryolite: 2-6%, glass agent 0.5-5%, among which, the glass agent is boric oxide / or sodium borate. The flux is in glass state under high temperature and no crack appears in the stirred solution in the Mg melt so that it increase the protection effect for over 3.5 hours.

The invention provides a high-stability water-based silver-plating protective agent. Every liter of the high-stability water-based silver-plating protective agent comprises 40-100 g of octadecanethiol, 4-10 g of trimethyl mercapto phosphate, 100 mg of reduced graphene oxide, 40-100 g of an emulsifier, 10 g of a stabilizer and the balance deionized water. The high-stability water-based silver-plating protective agent adopts the stabilizer and graphene, so that the service life of the protective agent is prolonged, and the corrosion resistance and color change resistance of protected metal are improved; and the surface appearance and performance of the silver-plating layer protected by the protective agent are not affected, a potassium sulfide resistance test of electronic products can be maintained for more than 12 minutes, and the protection time is greatly prolonged.

A 3D NAND memory and a method for forming the same are disclosed. The forming method includes providing a semiconductor substrate on which a stacked structure is formed, wherein the stacked structureincludes a plurality of sacrificial layers and isolation layers which are alternately stacked, the stacked structure has a first channel hole and a second channel hole in communication with the firstchannel hole, the second channel hole has an alignment offset with respect to the first channel hole, and a step is formed at a boundary between the first channel hole and the second channel hole; forming a charge storage layer on the sidewalls and the bottoms of the first channel hole and the second channel hole; forming a channel hole sacrificial layer on the charge storage layer; forming a protective layer on the channel hole sacrificial layer; successively etching the protective layer, the channel hole sacrificial layer, and the charge storage layer on the bottom of the first channel holeto form an opening exposing the surface of the semiconductor epitaxial layer. The method of the present invention prevents the charge storage layer at the step from being broken or damaged, thereby preventing memory failure.

The invention discloses a process for preparing activated carbon for air-raid shelters. The process comprises the following steps: finely selecting raw materials, preparing a first mixed liquid, preparing a second mixed liquid, preparing a third mixed liquid, soaking, calcining, preparing a fourth mixed liquid, performing secondary soaking, and performing secondary calcining. The process has the advantages that the produced activated carbon for air-raid shelters has the advantages of being high in strength, good in adsorption property, large in adsorption capacity, small in ash content, rapidin adsorption velocity, long in protection time, good in protection effect, and the like, has very good effects in industrial waste gas treatment, prevention of toxic and harmful gases, and the like,and particularly has excellent adsorption properties which are comparable by common granular carbon for benzene, hydrocyanic acid and chloroethane in waste gases; meanwhile, due to the product, defects of conventional coal columnar carbon are solved, the field of activated carbon is further widened, defects of the coal columnar carbon are further alleviated, and a relatively excellent product is provided for waste gas treatment, toxic and harmful gas prevention, and the like.

The invention discloses a post-welding protection dragging cover for titanium alloy laser-MIC composite welding. The post-welding protection dragging cover comprises a shell protection cover, the top of the shell protection cover is hinged to a connecting transverse rod, the connecting transverse rod is provided with a fixing connecting piece for fixation of an MIG-welding welding gun, a copper mesh is installed at the bottom of the shell protection cover, a breather pipe is installed at the tail portion of the shell protection cover and is connected with a pneumatic quick-insertion air pipe connector, and an inclined arc face for installation of the MIG-welding welding gun is arranged at the front end of the shell protection cover. By means of the post-welding protection dragging cover for titanium alloy laser-MIC composite welding and a welding method, protection gas of a welding seam can be stable in flow, the protection area is increased, and the protection time is prolonged; and in addition, the welding seam is in the continuous protection state after welding, and the possibility of contact between the post-welding welding seam and air is greatly reduced.

The invention discloses a whitening anti-aging cosmetic and a preparation method of the whitening anti-aging cosmetic. The whitening anti-aging cosmetic has the formula comprising an oil phase, a water phase, a functional component and a preservative, wherein the oil phase comprises 15-25% of oil, 0.5-10% of emulsifying agent and 1-5% of co-emulsifier; the water phase comprises 30-75% of ionized water, 0.5-8% of emulsifying agent, 3-8% of humectant, 0-3% of alkaline agent, 0-1.5% of thickening agent and 0-0.5% of emulsion stabilizer; the functional component comprises 0.5-1.5% of pomegranate bark extract, 0.5-3% of spirulina extract, 0.5-3% of corn super oxide dismutase extract and 1-5% of fruit acid mixture; the whitening anti-aging cosmetic comprises 0.3-2% of preservative. The whitening anti-aging cosmetic is prepared by reasonably compounding the active ingredients, and has the effects of whitening skin and resisting senility. The active ingredients are embedded, so that the problems of dispersity and stability of the active ingredients can be effectively solved; furthermore, the release speed of the active ingredients is effectively delayed, so that the aims of being effective for a long time and safe to use can be achieved.

The invention belongs to the technical field of preventing and treating of agricultural production, and particularly relates to a method for preventing and treating the gummosis of sweet cherries. The preventing and treating method is realized through the following scheme: (1) scientifically constructing an orchard, and planting healthy nursery stocks; (2) chemically preventing and treating the gummosis in three phases: treating the gummosis with different chemical agents at different stages; and (3) reasonably trimming trees, and protecting the trees. According to the preventing and treating method provided by the invention, the vacancy about the method for preventing and treating the gummosis of the sweet cherries in the prior art is filled; according to the growth characteristics of the sweet cherries, the gummosis is prevented and treated by different methods at different time stages, the preventing and treating effect is good, the growth potential of sweet cherry trees is enhanced, and the yield of the sweet cherries is increased; besides, a specific whitewash agent is utilized, so that the whitewash effect is good, the protecting time is long, and soil is not influenced.

The invention relates to the field of ceramic coating and surface engineering, in particular to a method for preparing a Ti2AlC phase ceramic coating through cold spraying in-situ formation. The preparation method can be applied to an MAX phase material system capable of being synthesized through pressureless sintering and is specifically explained through the preparation method for the Ti2AlC phase ceramic coating. The preparation method comprises the steps that firstly, raw material powder for sintering and preparing the coating is mixed according to the required proportion; secondly, an organic solvent and an adhesive are added into the mixed powder to form slurry through wet ball grinding; thirdly, the slurry is dried into spherical raw material powder through a spray drying granulation method; fourthly, the spherical raw material powder is deposited on a base material where the coating needs to be prepared through a cold gas dynamic spraying device; and fifthly, the deposited base material and the coating are sintered under a vacuum atmosphere, and an in-situ formation MAX phase ceramic coating can be obtained. The method for preparing the MAX phase ceramic coating through cold spraying in-situ formation has the characteristics that the prepared coating is large in thickness and good in quality, the powder deposition speed is high, no MAX phase decomposition reaction occurs in the process, using is convenient, and the method is suitable for large scale application.

The invention discloses a preparation method of an anticorrosion coating of stereoscopic-structure graphene-reinforced epoxy resin. The preparation method comprises the steps of (1) weighing the components of epoxy resin, diluent I and graphene powder by mass percent, mixing, and dispersing to obtain graphene epoxy resin liquid; (2) adding a filler, aids and diluent I to obtain graphene epoxy resin color paste; (3) adding mica iron oxide, and mixing to obtain graphene-reinforced epoxy resin anticorrosion coating component A; (4) mixing a curing agent and diluent II, and dispersing to obtain graphene-reinforced epoxy resin anticorrosion coating component B; (5) mixing the graphene-reinforced epoxy resin anticorrosion coating components A and B to obtain the anticorrosion coating of stereoscopic-structure graphene-reinforced epoxy resin. The process of the anticorrosion coating is simple; large-scale production of graphene-based coatings can be achieved; the prepared coating with stereoscopic-structure graphene has good physical properties and evident salt spray resistance.

The device and method used in internal-combustion engines for detecting and measuring fuel with simple structure and accurate measurement feature that the oil inlet sensor and the returning oil sensor are connected to the single chip, via signal processing circuit through the photoelectric isolation, the display, the man-machine interface, the power module, the jack of manual operator, the 'watch dog' circuit are connected to the single chip respectively. The high accurate math model, the intelligent flow calculation system and anti-interference measures make the system possible to work under harsh environments in strong shock, high temperature and strong interferences, giving accurate measuring of flux of light diesel oil.

The invention discloses a long-period shutdown protection method for generator sets and belongs to the field of power generation facility protection. The method comprises the following steps: when the pressure of a boiler is reduced to 1.6 MPa, adding hydrazine (5-10 mg / L) into the boiler, and adding hydrazine (5-10 mg / L) into a once-through boiler; when the pressure of the boiler is reduced to 0.5 MPa, closing all drain valves, water discharge valves and air valves on the heating surface of the boiler, opening a nitrogen filling valve on the heating surface of the boiler and filling nitrogen into the boiler, and maintaining the pressure of the nitrogen within a range of 0.03-0.05 Mpa; when detecting that the purity of discharged nitrogen is greater than 98%, closing all the water discharge valves, and maintaining the pressure of the nitrogen within a range of 0.01-0.03 Mpa; and when the temperature of a cylinder wall is reduced to below 100 DEG C, continuously filling nitrogen into a gas turbine engine. According to the invention, various corrosions caused in the long-period shutdown process of a generator set can be effectively eliminated, the integral protection time of the generator set is prolonged, and the protection period can be more than one year.

The invention discloses an elastic epoxy resin coating and a preparation method thereof. The coating comprises epoxy resin, scales, modified resin, an additive, an assistant, a solvent and a curing agent, and is mainly used as a concrete anticorrosive coating. Compared with a common epoxy coating, the coating of the invention has excellent ductility and elongation at break, also has good corrosionresistance, can be widely applied to concrete structure protection in various heavy corrosion environments such as acid, alkali, salt, ocean, soil, chemical atmosphere and the like, and has excellentprotection performance.

The invention relates to a preparation technology of on-rust antirust heavy duty anticorrosion paint and belongs to the technical field of on-rust antirust heavy duty anticorrosion paint preparation. The preparation technology comprises the following steps of 1, stirring, 2, grinding, 3, dispersion, 4, resin preparation, 5, paint preparation and 6, stirring. The preparation technology has simple processes and can produce the paint with high permeability, high solid content and low viscosity. The paint can go through a rust layer and passivate active and harmful iron compounds in the rust layer into a harmless filling material.

The invention discloses a method for preparing a water-soluble molecular self-assembly film type metal protective agent. The method comprises the following steps: A, mixing water and an organic solvent of which the mass ratio is (0.5-1.5);10, uniformly stirring, and preparing a mixed solvent; B, adding an emulsifier which accounts for 30-50 percent of the mass of the mixed solvent in the step A, uniformly stirring, and preparing a mixture; C, adding a film agent which accounts for 12-20 percent of the mass of the mixture in the step B, uniformly stirring, and further preparing a mixed solution; and D, adding a surfactant which accounts for 1.5-2.0 percent of the mass of the mixed solution and a reducing agent which accounts for 0.1-0.5 percent of the mass of the mixed solution in the step C, heating under water bath conditions at the temperature of 51-58 DEG C, controlling the temperature of the mixed solution, continuously stirring for 90-150 minutes, thereby obtaining the water-soluble molecular self-assembly film type metal protective agent. The method is simple in process, low in energy consumption and environmental friendly, a molecular self-assembly film can be formed on the metal surface through the protective agent, and the metal is effectively prevented from discoloring. The method is simple in process and large-scale production is easy to realize.

The invention discloses a polyacid metal surface treating agent. The surfaces of acrylate liquid cement particles contain a mass of carboxyls; aniline is added into acrylate liquid cement; aniline monomers are firstly diffused into a micelle and then are doped with the carboxyls, and after that, under the action of an oxidizing agent, the aniline performs polymerization reaction on the surfaces of latex particles; the contact angle of a polyaniline coating relative to water is increased, the adhesion and water resistance are improved, the coating can enable a metal surface to be passivated and protected by an electron transfer action and a redox action, as for fluo titanic acid subjected to silanizing modification, an introduced inorganic component Ti4<+> forms TiO2 particles in a heating curing process, the TiO2 particles evenly fill the gaps of a silane film, the whole film layer is more even and compact, micro-electrochemical reaction on the surface of the film layer can be effectively inhibited, and thus the corrosion resistance is greatly improved.

The invention relates to a material for purifying micromolecule poisonous gases as well as a preparation method of the material, and belongs to the technical field of poisonous gas purification. The purification material comprises spherical carriers and reactive metal oxides; the spherical carriers are flower spherical rear-earth metal oxides, and are formed by weaving flaky petals; the reactive metal oxides are attached to petal clearances of the spherical carriers and petals at the outer layer in a form of nano particles. The material provided by the invention is a poisonous gas purification material, and greatly improves the protection effect of a protective facial mask at normal temperature, has two functions of adsorption and chemocatalysis and decomposition, and has a better protection effect and a purification function, compared with the existing catalytic materials, the service life of the material is prolonged by more than 10 times and meanwhile good antibacterial and sterilizing effects are achieved; the preparation method provided by the invention is mature in synthesis technology; the technical operation is easy to master; the microstructure of a purifying agent is in uniform distribution, and the productivity reaches 80% above.

The invention relates to the technical field of food fresh keeping and in particular relates to a squid fresh-keeping agent as well as a reparation method and a fresh-keeping method thereof. The squidfresh-keeping agent is prepared from the following components in parts by weight: 10 to 15 parts of radix polygonati officinalis polysaccharide extract, 3 to 6 parts of coral reef powder, 1 to 3 parts of phytic acid, 2 to 5 parts of tea polyphenols, 1 to 3 parts of protamine, 1 to 3 parts of sodium lactate and 180 to 200 parts of water. The squid fresh-keeping agent provided by the invention hasthe advantages of relatively good bacterium-inhibition and water-retention performance and long fresh-keeping time.

The invention discloses a protection technology, and particularly relates to a concrete slope vegetation protection method applied to a sponge city. The method is suitable for concrete slope vegetation protection equipment. A concrete slope vegetation protection device comprises a concrete slope, the concrete slope is poured on the slope surface of a soil layer slope, and protection devices distributed in a linear array mode are arranged on the concrete slope; and each protection device comprises splayed flow distribution plates fixedly connected to the top of the concrete slope, a protectionplate is symmetrically arranged between every two adjacent splayed flow distribution plates, and the two protection plates between every two adjacent splayed flow distribution plates form a longitudinal flow distribution channel. Through the arrangement of the structure, scouring of accumulated water on the road surface on the vegetation in heavy rain weather is avoided, large damage to the vegetation is avoided, the growth life of the vegetation is greatly prolonged, and meanwhile, the protection time of the concrete slope is greatly prolonged.

The invention relates to a process for preparing a rust-bearing rust-proof heavy-duty coating and belongs to the technical field of rust-bearing rust-proof heavy-duty coating preparation. The process comprises the following steps: 1) stirring; 2) grinding; 3) dispersing; 4) preparing a resin; 5) preparing the coating; and 6) stirring. The production process is simple and quick, and the produced coating has high permeability, high solid content and low viscosity and can passivate active and harmful iron compounds in a rust layer into harmless fillers.

The invention discloses a mobile terminal data safety protection method. A key is stored in a protection device, the key is read when the mobile terminal and the protection device are within a safety effective distance, encryption or decryption processing is carried out on data inside the mobile terminal via the read key, or otherwise, encryption or decryption processing cannot be carried out. The invention also provides a mobile terminal data safety protection device. According to the above principle, the mobile terminal data safety protection device comprises the protection device and the mobile terminal, wherein the two are in wireless connection. Through judging whether the physical distance between the two is in a preset safety effective range, the key is read when the mobile terminal and the protection device are within a safety effective distance, encryption or decryption processing is carried out on data inside the mobile terminal via the read key, or otherwise, encryption or decryption processing cannot be carried out. Due to the method and the device of the invention, safety of data in the mobile terminal can be effectively enhanced.

The invention discloses an air filtering and absorbing device. The air filtering and absorbing device comprises a filter shell, a free radical generator, a fine filtering unit and a toxin filtering unit, wherein an air inlet and an air outlet are formed in two ends of the filter shell; an inflow air diffuser is fixedly arranged between the outlet of the air inlet and one end of the filter shell; an outflow air diffuser is arranged between the other end of the filter shell and the inlet of the air outlet; the free radical generator extending into the inflow air diffuser is arranged on the outerwall of the inflow air diffuser; the fine filtering unit is fixed on the inner wall of one end of the filter shell and close to the outlet of the inflow air diffuser; the toxin filtering unit is arranged in the part, located between the fine filtering unit and the inlet of the outflow air diffuser, of the filter shell; the end of the air inlet and the end of the air outlet are each provided withan inlet / outlet adapter. According to the air filtering and absorbing device, the stroke and time of air filtering are increased, air purification is more thorough, dust in air can be effectively filtered and purified, and bacteria, viruses and the like in the air are killed.