42results about How to "Not easy to oxidize and change color" patented technology

The invention relates to a silver-loaded antibacterial dressing and a preparation method thereof. The preparation method comprises the steps of dissolving silver salt components such as silver nitrate and silver acetate and stabilizing agent components such as poly-amido compounds, poly-hydroxyl compounds and poly-carboxyl compounds into deionized water, and then mixing the constituents uniformly, so that a silver salt antibacterial solution is obtained; dipping or soaking an antibacterial dressing substrate into the silver salt antibacterial solution, and conducting drying, so that silver loading of the antibacterial dressing substrate is achieved. The silver loading method of the silver ion antibacterial dressing is simple, easy to implement and suitable for large-scale production; the obtained silver-loaded antibacterial dressing has the excellent antibacterial property, silver ions can be released stably, oxidizing discoloration does not occur easily, falling of silver at a wound and pigment deposition are not caused easily, and the silver-loaded antibacterial dressing and the preparation method thereof can be widely applied to silver loading processing of various silver ion antibacterial dressings.

The invention relates to the field of production of high melting-point wax, and discloses a method for producing high-grade wax by Fischer-Tropsch synthesis crude wax. The method comprises the following steps: A) a hydrogenation saturation step: performing hydrogenation saturation on a raw material; B) primary separation: placing the saturated raw material in the step A) in a primary rectification unit, rectifying the raw material under certain pressure and temperature effects to obtain a light component, soft wax and crude hard wax; C) secondary separation: placing the crude hard wax obtained in the step B) in a secondary distillation unit, evaporating the material under certain pressure and temperature to obtain a first gas phase and a liquid phase; and D) third separation: placing the liquid phase in a third distillation unit, evaporating the material under certain pressure and temperature to obtain a second gas phase and superhard wax; wherein the primary rectification unit is a vacuum rectifying tower. The method can reduce the hardware cost of the employed distillation units in the separation process and increases the economic performance of a Fischer-Tropsch device.

The invention relates to lead-free solder paste for a needle cylinder and a preparation method. The lead-free solder paste is characterized by comprising lead-free electronic grade tin alloy powder and flux, diethylene glycol monobutyl ether, tetraethylene glycol dimethyl ether and polyoxyethylene glycerin ether are sequentially added into a temperature control emulsifying machine and are heated and mixed, polymerized rosin 604#, polymerized rosin 105# and hydrogenated rosin are added into the temperature control emulsifying machine and are mixed to obtain primary mixed liquor, the primary mixed liquor is cooled, 2,3-dibromo 1,4-butylene glycol, sebacic acid and butanedioic acid are added into the primary mixed liquor and then are mixed to obtain secondary mixed liquor, the secondary mixed liquor is cooled, modified hydrogenated castor oil and polyamide wax are added into the secondary mixed liquor and then are mixed to obtain tertiary mixed liquor, the tertiary mixed liquor is cooled, fluorocarbon surfactant and triethanolamine are added into the tertiary mixed liquor and then are mixed and vacuumized until the temperature returns to room temperature, the tin alloy powder Sn42Bi58 is added into the prepared flux after standing for 24 hours at the temperature of 22-25 DEG C, and the tin alloy powder and the flux are mixed by a double-planet solder paste mixer to obtain the lead-free solder paste for the needle cylinder. The lead-free solder paste has the advantages of superior environmental friendliness, excellent dry resistance, fine thixotropy and fine uniformity.

A provided aluminium paste anode electrophoresis tank liquid is composed of anode electrophoresis paint, aluminium paste, an aluminium paste auxiliary agent, a solvent and deionized water. A provided aluminium paste anode electrophoresis technology comprises the following steps: (1) pretreating a base material; (2) putting the pretreated base material in the aluminium paste anode electrophoresis tank liquid for electrophoresis, and controlling all technological parameters; (3) washing by using pure water; and (4) solidifying and drying. Various technological problems in the prior art are broken through, the developed liquid and technology are suitable for aluminium paste anode electrophoresis, an electrophoresis film with the thickness of 15-30 mu m is obtained, and the film is uniform in thickness, high in hardness, good in adhesive force, good in wear resistance, flat in appearance, slivery white and strong in metal texture, and possesses both corrosion resistance and decorative property.

The invention discloses a preparation method of deep-fried crispy lotus root strips. The preparation method comprises the following steps: cleaning fresh lotus roots and removing the peel of the fresh lotus roots, carrying out blanching, color protection and softening treatment to lotus root segments, cooling, cutting into lotus root strips, draining water on the surfaces of the lotus root strips, adhering a water-retention powder layer by use of a gelatinized starch slime layer on the surfaces of the lotus root strips, forming a water-resisting layer on the surfaces of the lotus root strips, hanging crispy paste on the lotus root strips adhered with the water-retention powder layer, coating breadcrumbs, frying, deoiling, air cooling and packaging. The method is used for solving the technical problems of moisture seepage and oil infiltration in a storage process of the deep-fried crispy lotus root strips and can ensure that the deep-fried crispy lotus root strips keep the original crispy character; and the prepared deep-fried crispy lotus root strips can keep the crispy character for more than 2 days at normal temperature, are appropriate in hardness, are difficultly oxidized and discolored, are delicious in taste, are crispy in mouthfeel, and are the healthy, convenient and delicious fried food.

The invention relates to the technical field of regenerated fibers, especially to a functional protein regenerated fiber and a manufacturing method thereof. The functional protein regenerated fiber comprises, by weight, 1 to 99 parts of protein, 1 to 99 parts of polyvinyl alcohol and 0.035 to 9 parts of amino acid and / or amino acid hydrochloride. Compared with the prior art, the invention has the following advantages: amino acid and / or amino acid hydrochloride is added to improve secondary and tertiary structures of protein molecules, so the degree of polymerization of the regenerated fiber is increased, and the prepared fiber is firmer.

The invention discloses a preparation method of a ledipasvir intermediate shown as formula (III). The method is characterized by taking (1R, 3S,4S)-N-t-butyloxycarbonyl-2-azabicyalo[2.2.1] heptane-3-carboxylic acid and o-phenylenediamine as raw materials and synthesizing (1R, 3S,4S)-3-(6-bromine-1H-benzimidazole-2-yl)-2-azabicyalo[2.2.1] heptane-2-carboxylic acid tert-butyl ester by using an anhydride mixing method. The whole route is low in production cost and high in yield; the formed monoamide is easy to purify; the generation and the residual of impurities are reduced; the o-phenylenediamine used as the raw material is cheap and easily-available, is hard to oxidize and discolor and can be stored in bulks; the industrial production is facilitated. The formula (III) is described in the description.

The invention discloses a processing method of dendrobium nobile lindl flowers. The method includes the steps of picking the dendrobium nobile lindl flowers, soaking the cleaned dendrobium nobile lindl flowers in soaking liquid for color protection treatment, and fishing up and draining the flowers, wherein the soaking liquid is prepared from nisin, vitamin C, cellulase, grape oxidase and phytic acid; filling the peel of a XinHui dried-tangerine-peel tangerine with the color-protected dendrobium nobile lindl flowers, covering the peel with a fruit cover, and putting the dried-tangerine-peel tangerine on a tray; putting the tray into the lyophilizer, starting a vacuum pump to vacuumize for 1h to 1.5h, heating the tray to 35-40 DEG C for 2h, adjusting the temperature to 45-50 DEG C, performing drying for 8h, performing cooling and packaging, and storing an obtained product in a cool dry place to obtain the dried dendrobium nobile lindl flowers. The processing method has the advantages that the dried dendrobium nobile lindl flowers obtained by the method can retain effective nutrient components, appearance and color of the dendrobium nobile lindl flowers to the greatest extent, are not liable to oxidation stain after long-time storage, have fruit aroma and nutrient components of the Xinhui dried-tangerine-peel tangerine, and have mellow and fragrant tea flavor, thereby being popular among customers.

The invention discloses a PCB. The PCB comprises a substrate. The PCB comprises a circuit routing layer; the routing layer is provided with a welding blocking layer; the welding blocking layer is provided with a tin spraying layer or a gold spraying layer; the tin spraying layer or the gold spraying layer is also provided with an anti-oxidization layer; and the anti-oxidization layer is provided with a silkscreen layer. The anti-oxidization layer enables a welding pad on the PCB to be not easily oxidized and discolored and enables tinning to be easier so that the PCB welding pad is prevented from being damaged due to long-time heating. The anti-oxidization layer further comprises a soldering flux so that tinning is easier during a PCB welding process, the welding quality is improved, and the loss is reduced.

The invention provides a metal-imitated coating for building external walls and a preparation method of the metal-imitated coating. The metal-imitated coating is a double-component coating for constructional engineering. The metal-imitated coating is prepared from primer A, a primer auxiliary agent B, finish paint A and a finish paint auxiliary agent B. During construction, the primer auxiliary agent B is added to the primer A, and the primer is applied to flat walls provided with diving joints, subjected to putty grinding and capable of being constructed directly in a coated manner; the finish paint auxiliary agent B is added to the finish paint A, the dried primer is coated with the finish paint, and finally, the building external walls achieve the decorative effect of an imitation aluminium plastic sheet curtain wall. According to the invention, solid content of a product under the construction condition is increased, an ester mixture is selected as a diluent, toxicity of a solventin a using process is reduced, pollution to the environment is reduced, dissolving capacity for resin and the coating is improved, applicable viscosity, diluent consumption and VOC content are reducedbetter, good paint film property of a product is kept while environmental protection property of product use is improved, and a coating film has the characteristics of good flashing property, low probability of oxidizing discoloration and long service life.

The present invention provides a compound with a structure represented by general formula I or a pharmaceutically acceptable salt thereof, a preparation method for the compound or the salt, and a use of the compound or the pharmaceutically acceptable salt thereof in the preparation of medicaments for treating nervous system diseases, such as epilepsy, convulsion, neuropathic pain, acute ischemic stroke or neurodegenerative diseases. Compared with Retigabine, the compound of the present invention has better brain tissue absorption. Moreover, the compound provided by the present invention not only has greatly improved efficacy, but also has far fewer neurological side effects than Retigabine, and therefore has a wider safe window.

The invention relates to energy-saving fuel oil, which comprises the following raw materials in weight percentage: 50 to 80 percent of diesel, 4 to 10 percent of naphthenic acid, 6 to 15 percent of fatty acid, 1 to 4 percent of emulsifying agent, and the balance being water. The fuel oil is energy-saving, environment-friendly, and the cost of each ton of the fuel oil is reduced by between 300 and500 Yuan compared with that of the diesel. The fuel oil has no harm to the machinery and human bodies and no side effects. Compared with the diesel, the energy-saving fuel oil burns fully, has high thermal value, large power, and good flow path; the energy-saving fuel reaches the national diesel burning standard; and the quality guarantee period of the burning oil is between 3 months and 1 year generally, and the oil product is not easy to be oxidized and discolored.

The invention provides a dispersible ethylene-propylene copolymer and a preparation method thereof. The dispersible ethylene-propylene copolymer comprises, by weight, 90-99.7% of an anhydride group-grafted ethylene-propylene copolymer and 0.3-10% of N-(1-naphthyl)ethylenediamine and its derivatives. The preparation method comprises that the anhydride group-grafted ethylene-propylene copolymer and N-(1-naphthyl)ethylenediamine and its derivatives undergo a reaction in the presence of base oil to produce a glue solution containing the dispersible ethylene-propylene copolymer. The preparation method has the advantages that the product color is not changed easily by oxidization, amide residues can be removed by reduced pressure distillation, an after-treatment reaction is avoided, preparation processes are simple, and energy is saved. The dispersible ethylene-propylene copolymer can be used as a dispersion viscosity index improver and can be used in lubricating oil. Through use of the dispersible ethylene-propylene copolymer, oil products have excellent dispersion performances.

The invention relates to a ceramide preparation pure dry powder which is white without peculiar smell and is made from galactosyl ceramide, phosphatide and cholesterol which are mixed uniformly. The weights of the galactosyl ceramide, the phosphatide and the cholesterol respectively take 60 percent to 70 percent, 20 percent to 25 percent and 10 percent to 15 percent in the total weight of the dry powder. A dry pasty ceramide preparation developed by East China Normal University and ethanol are used as raw material and extracting solution respectively. The ethanol is used for extracting ceramide from the dry pasty ceramide preparation twice, the extract is frozen and dried, and the dry powder is prepared. The dry powder is used as the raw material; a small quantity of 95 percent medical ethanol is added to be heated and dissolved and injected into hot stirred distilled water by an injector; and ceramide lipidosome emulsion is prepared. The dry powder is added into cosmetic; the addition is 0.01 percent to 0.1 percent of the weight of the cosmetic; the dry powder and the cosmetic are stirred uniformly; and the cosmetic with moisturizing function is prepared.

The invention discloses an antibacterial polyethylene cable material unlikely to change color. The antibacterial polyethylene cable material unlikely to change color comprises the following raw materials in parts by weight: 15-25 parts of an ethylene-vinyl acetate copolymer, 10-20 parts of polyvinyl chloride, 30-40 parts of polyethylene, 6-14 parts of apatite, 5-11 parts of barium metaborate, 4-9 parts of barium titanate, 6-12 parts of polyacrylonitrile-based carbon fibers, 2-8 parts of modified clay, 2-4 parts of disproportionated rosin, 2-6 parts of deacetylated chitosan polysaccharide, 2-4 parts of dioctyl terephthalate, 0.8-1.2 parts of microcrystalline wax, 0.8-1.6 parts of dicumyl peroxide, 0.3-0.9 part of p-phenylenediamine, 0.4-0.8 part of dodeceny succinicanhydride, 0.5-1 part of cerium oxide, 0.2-0.24 part of lanthanum oxide, 0.6-1.2 parts of a polyphenol antioxidant 1076 and 1.5-2.5 parts of an antistatic agent.

The invention discloses an antibacterial waterproof polyethylene cable material. The antibacterial waterproof polyethylene cable material is prepared from, by weight, 25-35 parts of polyethylene, 5-12 parts of polytrifluorochloroethylene, 10-18 parts of ethylene-vinyl acetate copolymer, 2-10 parts of polyacrylonitrile-based carbon fiber, 2-8 parts of aluminum oxide, 3-8 parts of aluminum borate whiskers, 2-7 parts of sodium antimonite, 0.2-0.6 part of diethylenetriamine, 0.4-0.8 part of cyanoethylated diethylenetriamine, 0.1-0.6 part of p-phenylenediamine, 1-2 parts of chlorinated polyethylene wax, 0.4-0.9 part of dioctyl adipate, 1-4 parts of modified clay, 1-3 parts of chitosan polysaccharide, 1-2 parts of chlorinated paraffin, 0.1-0.16 part of lanthanum oxide, 0.4-0.9 part of cerium oxide, 0.4-0.8 part of stabilizer and 1-2 parts of color master batch. The antibacterial waterproof polyethylene cable material is good in waterproofness and thermal stability, excellent in mechanical performance and antibacterial performance and not prone to oxidation and discoloring.

The invention relates to a wire field and particularly relates to an enamelled wire. The enamelled wire comprises a metal core, wherein the outer surface of the metal core is sequentially coated with an inorganic micro particle layer, a wear-resistant insulation layer and insulation paint layer, the wear-resistant insulation layer is a nylon surface layer dipped in epoxy resin, and insulation paint is mixture of polyurethane insulation varnish and high temperature color concentrate. The enamelled wire has advantages of ultraviolet irradiation resistance, high temperature resistance for melting prevention and strong acid and alkali resistance capability.

The invention discloses an antibacterial silicone tube, a composite antibacterial material and a method for preparing a surface coating on a silicone tube from the composite antibacterial material. The antibacterial silicone tube comprises a silicone tube body and a nanometer silver-loaded titanium dioxide-chitosan composite antibacterial material layer on the surface of the silicone tube body. The composite antibacterial material is characterized by being prepared from the following raw materials by weight: 0.1 to 0.2 part of nanometer silver-loaded titanium dioxide, 0.05 to 0.1 part of a silane coupling agent KH-550 and 0.2 to 0.3 part of chitosan. The antibacterial silicone tube is high in security and low in cost; the composite antibacterial material is easy to prepare and not prone to oxidation stain; and the preparation method allows the antibacterial material to firmly coat the surface of the silica gel tube and not prone to falling off, and is small in consumption of the antibacterial material and low in preparation cost.

The invention discloses a surface-modified potassium titanate whisker-reinforced copper-based graphite motor carbon brush. According to the carbon brush material, natural flake graphite and flaky silver-plated copper powder are taken as base materials, and a polydopamine film is deposited on the surface of the natural flake graphite, so that the surface property is improved, the bondability and the dispersity of the polydopamine film and the other raw materials are improved and the sintered density of a green body is improved. The added potassium titanate whisker subjected to carbon nano-microsphere-polydopamine film coating treatment has good conductivity and enhancement effect; a traditional resin adhesive is replaced with silica sol, so that internal nodules of a system are effectively prevented from falling off in the sintering process; the finally prepared carbon brush material has more excellent mechanical property and anti-wear property than a traditional copper-based graphite carbon brush, and is durable in use, not easy to oxide and discolor and outstanding in performance.

The invention discloses a preparation method of an antibacterial fiber adsorption film. The method comprises the following steps: 1) preparing modified invertase; 2) pre-treating cellulose; 3) preparing an antibacterial fluid; 4) preparing a cellulose membrane; and 5) preparing an antibacterial film. The modified invertase can promote cellulose degradation and increases the enzyme catalytic activity, a NaOH and urea aqueous solution is taken as a cellulose solvent to rapidly dissolve cellulose to a transparent solution, homogeneity and stability are good, a cellulose solution has good spinnability and film forming ability, dried LiCl is added, oxidizing discoloration is difficulty carried, antibiosis effect is obvious, hygroscopicity is good, the chemical raw materials are easily recovered and recycled, the fiber adsorption film has the advantages of comprehensive properties of excellent aging resistance and high temperature resistance through ultrasonic concussion, aqueous solution processing is processed through silver-ammonia complex ions, and the antibacterial fiber adsorption film has stable antibacterial property, and good antibiosis effect.

The invention relates to the technical field of alloys, and particularly relates to a gold alloy. The gold alloy comprises 5-10% of Ag, 3-7% of Zn, 2-5% of Cu, 2-4% of Nb, 0.5-1.5% of Ca, 0.5-1.5% of Zr, 2-4.5% of Er, 0.5-1% of Ho, 1-3% of epoxy resin and the balance of gold and inevitable impurities. The invention also provides a synthetic method of the gold alloy. The gold alloy provided by the invention has the advantages of excellent high-temperature property, very long service life, high-temperature resistance, oxidization resistance and creep resistance; gold jewelry made from the gold alloy has the advantages of low price, high hardness and long-lasting color and luster and can be worn for a long time.

The invention discloses a processing method for dendrobium nobile lindl flowers. The method includes picking dendrobium nobile lindl flowers, putting cleaned dendrobium nobile lindl flowers into a soaking solution to soak and perform color protection treatment, and taking the flowers out to drain, wherein the soaking solution includes nisin, vitamin C, cellulase, glucose oxidase and phytic acid; filling the dendrobium flowers after color protection treatment into Xinhui dried tangerine peel mandarin peels, covering fruit covers, and placing the dried tangerine peel mandarin oranges in a charging tray; and putting the charging tray into a freeze dryer, starting a vacuum pump to perform vacuum-pumping for 1-1.5 h, performing heating to 35-40 DEG C to dry for 2 h, adjusting temperature to 45-50 DEG C to dry for 8 h, performing packaging after cooling, and obtaining dried dendrobium nobile lindl flowers after storing at cool and dry places. Through the method, the effective nutrient compositions, appearance and colors of dendrobium flowers can be maximumly reserved, and the dendrobium flowers can be preserved for a long time and is not easy to oxidized and discolored; and as the dendrobium flowers fuses the fruit fragrance of the Xinhui dried tangerine peel mandarin oranges, the tea can be mellow and thick in taste, fragrant and pleasant and can be deeply loved by consumers.

The invention relates to the technical field of wires, in particular to a copper-clad steel tin-plated wire and a preparation process thereof. The copper-clad steel tin-plated wire sequentially comprises a core layer, a copper layer and a tin-plated layer from inside to outside, and the thickness of the tin-plated layer is 1-3 micrometers; the preparation method of the copper-clad steel tin-platedwire comprises the following steps: A, pulling a steel wire; b, electroplating a copper layer; c, performing wire drawing and annealing treatment; d, cooling and performing air-drying treatment; ande, performing tinning treatment. The copper-clad steel tin-plated wire is novel in structure, simple in preparation process operation and easy to control, the prepared wire is high in strength, the tin-plated layer is stabilized on the basis that the high-strength copper-clad steel wire is prepared, protection on the copper layer is improved, the oxidation resistance of the wire is improved, the copper layer is not prone to oxidation discoloration or corrosion, and the service life of the wire is prolonged; and practicality is high.

The invention discloses a preparation method of deep-fried crispy lotus root strips. The preparation method comprises the following steps: cleaning fresh lotus roots and removing the peel of the fresh lotus roots, carrying out blanching, color protection and softening treatment to lotus root segments, cooling, cutting into lotus root strips, draining water on the surfaces of the lotus root strips, adhering a water-retention powder layer by use of a gelatinized starch slime layer on the surfaces of the lotus root strips, forming a water-resisting layer on the surfaces of the lotus root strips, hanging crispy paste on the lotus root strips adhered with the water-retention powder layer, coating breadcrumbs, frying, deoiling, air cooling and packaging. The method is used for solving the technical problems of moisture seepage and oil infiltration in a storage process of the deep-fried crispy lotus root strips and can ensure that the deep-fried crispy lotus root strips keep the original crispy character; and the prepared deep-fried crispy lotus root strips can keep the crispy character for more than 2 days at normal temperature, are appropriate in hardness, are difficultly oxidized and discolored, are delicious in taste, are crispy in mouthfeel, and are the healthy, convenient and delicious fried food.

The invention relates to the field of industrial production of food, in particular to boxed vegetable salad with prolonged preservation time. All component food materials are organically combined, thus achieving the effect of supplementing each other; according to a making method, vegetables are processed at the temperature of 10 DEG C or below, so that the breeding of bacteria is inhibited, the shelf lives of fruits are prolonged, and oxidation stain is not easily caused; the vegetables are soaked for a plurality of times, so that the mouth feel of the vegetables is enabled to crisper and tastier while the safety of the vegetables is guaranteed.

The invention discloses an extreme pressure wear-resistant and easily disperse additive for copper wire drawing oil, which comprises the following ingredients by mass percentage: 15-30% of boride, 6-15% of alkali, 10-20% of solvent, 40-60% of high base sulfonate extreme pressure agent, 3-10% of dispersing agent and 3-10% of phosphate compound. The invention further discloses a preparation method and an application of the additive. The additive can improve extreme pressure wear resistance of the copper wire drawing oil, has good compatibility with base oil and allows the copper wire drawing oilto have excellent storage stability.

The invention belongs to the technical field of the extraction of vegetable fat. An extraction method of fruit-flavored rapeseed oil is characterized by comprising the following steps of 1), screening, cleaning and removing rapeseed impurity; 2), hulling and separating the rapeseed by adopting an automatic huller, so as to obtain a rapeseed kernel; 3), crushing and sieving the rapeseed kernel, soas to obtain hulled rapeseed meal; 4), crushing and sieving a freeze-dried fruit slice, so as to obtain lyophilized fruit meal; 5), uniformly mixing the hulled rapeseed meal with the lyophilized fruitmeal, extracting fat by adopting supercritical carbon dioxide, so as to obtain crude oil; 6), carrying out centrifugal separation on the crude oil, so as to subsequently obtain the fruit-flavored rapeseed oil. The method is simple in process flow, high in abstraction efficiency, environment-friendly and safe and the obtained fat is pure in fruit flavor and good in oxidation stability.

The invention discloses a natural orange flavor containing moringa seed oil and a preparation method thereof, and relates to the field of food processing. The orange flavor consists of the following raw materials in parts by weight: 90-100 parts of moringa seed oil, 2-7 parts of sweet orange oil and 0.2-0.8 part of soy phospholipid. The natural orange flavor is prepared by the following steps: adding the sweet orange oil produced by a cold pressing method into the moringa seed oil extracted by enzymatic separation, and conducting blending. The orange flavor has a sweet and fragrant smell of fresh oranges, has a long shelf life, is not liable to oxidation, color change or flavor change, and can be directly added into various high-grade foods and medicines. The preparation method is simple,and mild in conditions, is a new energy-saving technology, employs easily obtained raw materials and devices, and is easy to popularize.

The invention discloses a high-separation low-temperature sausage casing membrane. The sausage casing membrane adopts a seven-layer composite structure formed by a TPO membrane layer 1, a TIE membrane layer 2, a TGPA membrane layer 3, a TIE membrane layer 4, a PA membrane layer 5, a TIE membrane layer 2 and a PO membrane layer 4 from outside to inside. The high-separation low-temperature sausage casing membrane disclosed by the utility model has the beneficial effects of simple structure and good practicality.