195results about How to "Good pollution effect" patented technology

The invention relates to a strong-inhibition drilling fluid system, comprising the following components by mass percent of 2.5-4.5% of bentonite slurry, 0.1-0.3% of alkaline regulator, 0.3-2.0% of shale inhibitor, 0.2-0.4% of metal ion polymer, 2.0-5.0% of walchowite, 2.0-5.0% of sulfomethal phenolaldehy resin, 1.0-3.0% of cation emulsified asphalt, 0.5-3.0% of lubricating agent, 0.2-0.8% of emulsifier, 2.0-8.0% of crude oil, and 1.0-3.0% of calcium carbonate superfine powder according to 100% of water. The compound in a general formula (I) is also provided; R1 is H or CH3; R2 is H, CH3 or C2H5; and X is an integer between 2 and 20 and applied to the shale inhibitor. The compound and the cation emulsified asphalt are applied to the drilling liquid system; the drilling liquid system is strong in shale inhibition; the shale recovery rate can be up to 90.33% and is improved by over 35.02% in comparison with that of water shale; the high temperature resistance can be up to 150 DEG C; the lubricating friction coefficients before and after aging respectively are smaller than 0.1; the strong-inhibition drilling fluid system is strong in capacity of resisting poor soil, salt and calcium contamination, strong in rejection capability, and good in blocking effect; the API (American petroleum institute) water loss of the drilling fluid is smaller than 4.5mL, and the HTHP (high temperature and high pressure) water loss is smaller than 12mL.

The invention relates to a nuisanceless powder injection refining flux belonging to a flux for casting. Aiming at the problem that a hexachloroethane powder injection refining flux inevitably generates toxic chlorine gas and fluorine gas which are harmful to the health of an operator, etch equipment and tools and cause serious pollution to the environment to generate public hazards. The nuisanceless powder injection refining flux is characterized by comprising the following components in percent by weight: 15-25 percent of Na2SiF6, 5-15 percent of Na2SO4, 5-15 percent of Na2NO3, 5-15 percent of CaF2, 15-25 percent of KCl and the balance of NaCl added to 100 percent. The NaCl and the KCl are combined to achieve favorable spread performance, coverage and separability; the Na2SiF6 produces non-toxic and volatile SiF4 and AlF3 and SiO2 with good slagging performance; a large quantity of hydrogen and other impurities can be taken out in the floating process of a fusant; the CaF2 promotes slag bodies to flow, and the Na2NO3 enables the fusant to raise the temperature partially, and a small quantity of molten aluminum or aluminum alloy doped in slag is dropped back to the fusant. On trial, the nuisanceless powder injection refining flux shows a favorable refining effect and has the beneficial effect of no toxicity or public hazards.

The invention discloses a method for recovering cadmium polluted soil by combining a compound microorganism bacterium agent with houttuynia cordata. The compound microorganism bacterium agent comprises the following components by count: 1*10<9>-9*10<9>CFU (colony forming unit) / m<3> pseudomonas fluorescens, 1*10<8>-6*10<8>CFU / m<3> actinomyces ruminicola, and 1*10<9>-9*10<9>CFU / m<3> glomus mosseae. The method for recovering the soil comprises the following steps that the houttuynia cordata is planted in cadmium soil and the compound microorganism bacterium agent is inoculated into the soil, or the houttuynia cordata is soaked in the compound microorganism bacterium agent and then planted into the cadmium soil; when branches and leaves of the houttuynia cordata are luxuriant, the branches and the leaves of the houttuynia cordata are harvested; and cadmium in the soil can be removed. The compound microorganism bacterium agent can better improve the tolerance of the houttuynia cordata, promote growth of a plant in the high-cadmium-content soil, improve the absorbility of the plant to cadmium, and enhance a soil heavy metal removal effect. The method for recovering the soil is a safe, environment-friendly, high-efficiency, economical and practical plant-microorganism combined method for recovering the heavy metal polluted soil, and has a significant application value.

The RE-containing Si-base semi-synthesized hydrocarbon converting catalyst features are that it is prepared with silicon sol binder containing RE salt 0.1-20 % (by REO), natural aluminum silicate clay and artificially synthesized molecular sieve. With RE activated silica, the catalyst of the present invention has high heavy oil cracking activity, high heavy metal contamination resistance, low content of olefin and S in catalytically cracked gasoline.

The invention discloses a polyurea-polysiloxane organic-inorganic hybridized concrete biological pollution protection material and a preparation method thereof. The pollution protection material is composed of a surface protection material and a base protection material, wherein the surface protection material is composed of the following raw materials in parts by weight: polyaspartic acid ester modified polysiloxane, modified isocyanate, a biological growth inhibitor, a catalyst, a coupling agent, an anti-ageing agent, a filler and pigment; the base protection material is composed of the following raw materials in parts by weight: modified epoxy resin, an epoxy curing agent, an reactive diluent, a coupling agent, an anti-ageing agent and a filler. The pollution protection material is excellent in biological pollution imitation performance, has the characteristic of low surface energy and can prevent biofouling. Special elements in structure interior of the material can inhibit growth of ocean and fresh water creatures, thereby achieving the aim of preventing biological pollution.

The invention relates to a mobile terminal, comprising a display screen, wherein the display screen is equipped with a first surface facing the outside world, and a second surface set opposite to thefirst surface, and a first storage space penetrating the first surface and the second surface is set on the display screen; a camera module which comprises a decoration element matching the first storage space and a lens assembly mounted in the decoration element; and a sealing element which resists between the outer wall surface of the decoration element and the inner wall surface of the first storage space. Through setting of the sealing element, the sealing element has certain elasticity, so a mounting clearance between the decoration element and the display screen can be effectively sealed, pollutants such as liquid and powder are prevented from entering the mobile terminal from the clearance to influence the working performance and service life of the mobile terminal, and the mobile terminal is guaranteed to have high liquid pollution and dust pollution prevention capacity.

The invention relates to a tackifying and shear strength improving agent and a preparation method thereof. The tackifying and shear strength improving agent disclosed by the invention is prepared through the steps of reacting dimeric fatty acid and polyethylene polyamine according to the molar ratio, namely 1: (0.4-1.6) of carboxyl to amino in the existence of triethylene glycol monobuthyl ether, wherein the reaction temperature is 140-160 DEG C; keeping the temperature until no water comes off, and then, further reacting for 10-20 minutes to finish the reaction; and removing water generated by the reaction while reacting. A soilless oil-based drilling fluid system with the tackifying and shear strength improving agent is good in suspension property, enhanced in solid-phase and stratum water pollution resistance, little in reservoir damage, increased in system permeability recovery value, stable in performance, strong in inhibiting property, good in lubricating property, low in plastic viscosity and high in temperature resistance up to 260 DEG C.

A process for preparing the ultrafiltering polyethersulfone membrane resisting against protein pollution includes such steps as preparing PVC solution and borax solution, washing the raw ultrafiltering polyethersulfone membrane, drying in the air, immersing in the PVC solution, washing, drying, immersing in the borax solution, washing, drying, and repeating the last 6 steps several times.

The invention discloses a method for carrying out rich-selenium culturing of plelmtus eqngiu by utilizing sodium selenite. The method provided by the invention is characterized by comprising the following steps: mixing a rich- selenium culturing material additive the weight of which accounts for 1-10% of the total weight of a culturing dry material into the culturing dry material; culturing according to a common culturing method, thus obtaining rich-selenium plelmtus eqngiu, wherein the content of the selenium in the rich- selenium culturing material additive is 0.5-100mg / kg, the numerical values of the particle sizes of the particles of the rich-selenium culturing material additive are distributed in multiple different numerical vaue intervals within a range from 0.005mm to 5.0mm, the particles with the particle size of 1.0-5.0mm accounts for 10wt% of the total additive, and the particles with the particle size of 0.005-0.1mm at least accounts for 40wt% of the total additive; and the rich-selenium culturing material additive is prepared from the following raw materials in parts by weight: 100 parts of corn cob powder and 0.0011-0.022 part of sodium selenite. The plelmtus eqngiu cultured by the method has the advantages of high selenium utilization ratio and stable selenium content in batches; and the method ensures no hidden selenium contamination trouble and is convenient to operate and easy to popularize.

The invention relates to a preparation method and application of a catalytic cracking metal passivant. The preparation method comprises the following steps of: preparing raw materials in the following percentage by weight: 20%-45% of dispersing agents, 30%-50% of oxidants, 15%-30% of metal oxides, 10%-30% of solvents and 2%-5% of stabilizing agents; sequentially adding the oxidants and the metal oxides to the dispersing agents during preparation; increasing temperature to 50-90 DEG C within 2-4 hours, keeping the temperature for 1-5 hours and then cooling; adding the solvents and the stabilizing agents, and then filtering to remove impurities so as to obtain the metal passivant, wherein the dispersing agents are diethanol amine and / or triethanol amine; the oxidants are hydrogen peroxide of 30-50 percent and / or nitric acids of 66-68 percent; the metal oxides are one of diantimony trioxide, rare earth oxides and bismuth oxides or mixtures of more than two of the diantimony trioxide, the rare earth oxides and the bismuth oxides in any proportion; the solvents are one of water or alcohol solvents or mixtures of more than two of the water or the alcohol solvents in any proportion; and the stabilizing agents are methylcellulose compound solutions.

Disclosed is a double-sided pressure-sensitive adhesive sheet for fixing a flexible printed circuit board, which has silicone release liners, but is less polluting and excels in workability. The double-sided pressure-sensitive adhesive sheet for fixing a flexible printed circuit board includes at least a pressure-sensitive adhesive unit including a substrate and pressure-sensitive adhesive layers present on or above both sides of the substrate; and silicone release liners present on or above both surfaces of the pressure-sensitive adhesive unit, in which the pressure-sensitive adhesive layers each include an acrylic polymer based on, as an essential monomer component, an alkyl (meth)acrylate whose alkyl moiety being a linear or branched-chain alkyl group having 1 to 14 carbon atoms, the pressure-sensitive adhesive unit has a thickness of 60 [mu]m or less, and the adhesive sheet evolves siloxane gas, if any, in an amount of 1 ng / cm<2> or less when heated at 120 DEG C for 10 minutes.

The invention relates to a device for MBR membrane pollution control, which is provided with a biological treatment unit and a submerged membrane treatment unit. The biological treatment unit is composed of anaerobic pool, anoxic pool and aerobic pool. There is a quick sedimentation tank between them. The control method is: 1) The sewage first enters the biological treatment unit; 2) The effluent of the biological unit enters the fast sedimentation tank connected to it; 3) The rapid separation of mud and water is realized in the fast sedimentation tank, and during the operation, according to the rapid sedimentation tank The hydraulic retention time, the sludge concentration of the biological treatment unit, and the requirements for nitrogen and phosphorus removal adjust the sludge reflux ratio of the rapid sedimentation tank; 4) Membrane cleaning is performed every 1 to 4 weeks according to the membrane fouling situation; 5) Every 1 to 4 weeks, the membrane is cleaned; At 4 weeks, during the membrane cleaning period, the membrane tank was drained and the mix was drained. The invention is suitable for the new construction or reconstruction of the submerged MBR process, can reduce the sludge concentration of the membrane tank, ensure the high sludge concentration of the biological treatment unit, prolong the cycle of membrane cleaning, occupy less land, have high efficiency and good effect.

The invention relates to the technical field of reverse osmosis composite membranes, and concretely relates to an antibacterial and pollution-resistant composite reverse osmosis membrane and a production method thereof. Silver nitrate and a stabilizer 3-aminopropyltrimethoxysilane (APS) are introduced into a membrane casting solution, the silver nitrate and DMF undergo a redox reaction in the dissolving and stirring process of a high-molecular polymer in order to form nano-silver particles, the nano-silver particles form a nano-silver stable dispersion under the action of APS, and the nano-silver stable dispersion is firmly embedded in a porous support layer to make the membrane have a certain antibacterial property; and triaminoguanidine hydrochloride (TAGH) is introduced into an aqueousphase solution, and the TAGH, m-phenylenediamine and trimesoyl chloride (TMC) undergo an interfacial polymerization reaction to form a polyamide desalting layer, so the membrane surface of the polyamide desalting layer is smooth and highly hydrophilic. The anti-adhesion property and the organic pollution resistance of the reverse osmosis membrane are greatly improved. Additionally, the "structuralfragmentation" effect of an guanidino group is used to activate water molecules, so the water permeability is enhanced, and the water flux is improved without sacrificing the salt rejection rate.

The invention discloses a hydrophobic oleophobic microporous membrane paster for protection of a welded car lamp and a manufacturing method thereof. The microporous membrane paster comprises a hydrophobic oleophobic finishing agent, a microporous membrane and a low-viscosity PE adhesive tape, wherein one surface of the microporous membrane is coated with the hydrophobic oleophobic finishing agent, and the low-viscosity PE adhesive tape is adhered on the other surface of the microporous membrane. The manufacturing method comprises the following steps: manufacturing of the microporous membrane; preparation of the hydrophobic oleophobic finishing agent; preparation of a hydrophobic oleophobic microporous membrane: a step of feeding the hydrophobic oleophobic finishing agent in a roller coater, unreeling the microporous membrane, allowing one surface of the microporous membrane and a roller to contact a coating and successively carrying out heating and predrying of the roller, baking and rolling; and process preparation: a step of compounding the other surface of the microporous membrane with the low-viscosity PE adhesive tape, carrying out molding and die cutting, discharging waste leftover materials and successively carrying out inspection, rolling and packaging. The hydrophobic oleophobic microporous membrane paster has self-cleaning capability as a lotus leaf does, a better effect on resistance of pollution by automobile exhaust gas is obtained when the hydrophobic oleophobic microporous membrane paster is used for protection of car lamps, and the hydrophobic oleophobic microporous membrane paster is superior to other protection modes and is an ideal method to overcome environmental load.

The invention discloses a device for purifying river / lake water pollution. The device is mainly composed of a floating body with a strain material pool, a slow release strain pipe and a straw rope carrier, wherein the floating body is arranged on the water surface; the slow release strain pipe is arranged below the floating body and is communicated with the strain material pool via a pipeline; the slow release strain pipe is provided with a through hole; and the straw rope carrier is plugged into the through hole to be hung below the slow release strain pipe. The method for purifying water pollution by adopting the device comprises the following steps: firstly, putting the device into river or lake water to be purified; adding the prepared beneficial strain into the strain material pool in the device; and continuously conveying into the water in due time via the slow release strain pipe and the straw rope carrier to form a algae-strain symbiosis environment so as to degrade pollutantsin water. The device for purifying river / lake water pollution is simple to manufacture, has low cost and has obvious effect on purifying rivers and lake water pollution.

The invention discloses a reclaimed water treatment method based on magnetic resin adsorption coupled electric adsorption, and belongs to the domain of preparation of reclaimed water. The method comprises the steps of pumping biochemical effluent of wastewater into a reactor added with magnetic resin particles to effectively reduce the chroma, organic matters, total nitrogen and total phosphorus in the wastewater; and performing precipitation separation on the fully mixed and adsorbed wastewater in a precipitation tank, refluxing the separated magnetic resin part, delivering the refluxed part to a regeneration tank, introducing the wastewater adsorbed by the magnetic resin into an electric adsorption device, desalting the wastewater, and further reducing a small amount of organic matters and inorganic impurities in the water. The indexes such as organic matter content, chroma, total nitrogen, total phosphorus and total salt in the water subjected to deep treatment of the integrated process are obviously reduced. The method can effectively reduce the organic matters, the chroma and the content of the total salt and the like in the wastewater, an electric adsorption electrode has a longer service life, and an efficient and economic preparation method for high-quality reclaimed water is provided.

The invention discloses a method for cultivating pleurotus eryngii uniformly rich in selenium with a mixed organic selenium source. The method is characterized in that the method comprises the steps of mixing selenium-rich cultivating material additive accounting for 1-10 percent of the total weight of dried cultivating material into the dried cultivating material, and cultivating pleurotus eryngii according to an ordinary cultivation method to obtain pleurotus eryngii uniformly rich in selenium; the selenium-rich cultivating material additive has a total selenium content of 5-50 mg / kg, and needs to be crushed first and then compressed to form particles of certain grain sizes, the grain sizes of the particles in the selenium-rich cultivating material additive are in the range of 0.005-5.0 mm with multi-grain-size regional distribution, the particles having a grain size of 1.0-5.0 mm account for about 10 weight percent of the total weight of the additive, while the particles having a grain size of 0.005-0.1 mm account for at least 40 weight percent of the total weight of the additive. The method has the advantages that the selenium utilization factor of the cultivating material in pleurotus eryngii is high, the selenium content in different batches of picked pleurotus eryngii is stable, therefore, the method is highly safe, convenient to operate, and easy to promote.

The present invention relates to a polyphenylene sulfonamide separation membrane and its modification method by using nano titanium dioxide. Said polyphenylene sulfonamide separation membrane is made up by using (by wt%) 5%-20% of polyphenylene sulfonamide, 78%-94% of organic solvent and 1%-5% of pore-forming agent through a certain preparation process. Its modification method includes the following steps: a), soaking the polyphenylene sulfonamide separation membrane in concentrated sulfuric acid for 1-3hr, then cleaning said polyphenylene sulfonamide separation membrane by using deionized water; and b) soaking the polyphenylene sulfonamide separation membrane in the nano titanium dioxide sol for 5-15min, finally using deionized water to wash said polyphenylene sulfonamide separation membrane so as to obtain the invented nano titaminum dioxide modified polyphenyl sulfonamide separation membrane.

The invention belongs to the technical fields of oil-water emulsion separation and heavy metal ion adsorption, belonging to a preparation method of a polyvinylidene fluoride modified membrane, and thepolyvinylidene fluoride modified membrane and application thereof. The method comprises the following specific steps: 1) immersing a polyvinylidene fluoride micro-filtration membrane into an aqueousferric ion solution, then taking out the membrane and cleaning the membrane; 2) immersing the obtained polyvinylidene fluoride micro-filtration membrane into an aqueous tannic acid solution, then adding polyethyleneimine into the aqueous tannic acid solution, taking out the polyvinylidene fluoride micro-filtration membrane after an open reaction, and conducting cleaning to obtain a PVDF membrane modified by tannic acid and polyethyleneimine; 3) immersing the obtained PVDF membrane modified by tannic acid and polyethyleneimine into an aqueous glutaraldehyde solution for a reaction to obtain a glutaraldehyde crosslinked PVDF membrane; and 4) immersing the glutaraldehyde crosslinked PVDF membrane into an aqueous cysteine solution, and then taking out the immersed membrane to obtain the polyvinylidene fluoride modified membrane. According to the invention, hydrophilicity is improved, protein pollution resistance is improved, an emulsion retention rate is high, and heavy metal adsorption effect is good.

The invention belongs to the field of agriculture and relates to a lucid ganoderma cultivation medium, a preparation method of the lucid ganoderma cultivation medium and a matched lucid ganoderma cultivation method. The invention aims at providing a lucid ganoderma cultivation medium which is wide in source and low in price and a preparation method of the lucid ganoderma cultivation medium. The lucid ganoderma cultivation medium disclosed by the invention comprises the following components in percentage by weight: 20-60 percent of apple branches, 20-50 percent of cottonseed hulls, 10-30 percent of corncobs and 10-15 percent of bran. The lucid ganoderma cultivation method comprises the following steps: (1) preparing materials; (2) mixing the materials; (3) bagging; (4) carrying out spawn running; and (5) discharging the lucid ganoderma to obtain ganoderma lucidum. The apple tree pruning branches are fully utilized, pollution-free treatment and recycling of the apple tree pruning branches are realized, a novel raw material is found for lucid ganoderma cultivation, and the cost of the lucid ganoderma is reduced. The byproducts of apple tree pruning branches are fully utilized, the cultivated lucid ganoderma is low in cost, the yield and the quality of the lucid ganoderma are superior to those of the conventional matrix or the effect is equivalent, and a novel cultivation raw material is provided for lucid ganoderma production.

The invention relates to the field of polymers, and in particular relates to a blue fluorescent polymer, blue fluorescent powder, blue fluorescent fibers, ultraviolet conversion into blue light resinas well as preparation methods and applications of the blue fluorescent polymer, the blue fluorescent powder, the blue fluorescent fibers and the ultraviolet conversion into blue light resin. The bluefluorescent polymer is prepared by performing modification on a maleic anhydride copolymer with a special general formula by a strong alkali; and the aqueous solution or the aqueous dispersion liquidof the blue fluorescent polymer has an excitation range from 300 to 425 nm, an emission range from 400 to 550 nm, and an emission peak of 430-520 nm of a blue light region. The blue fluorescent polymer, blue fluorescent powder, blue fluorescent fibers and ultraviolet conversion into blue resin provided by the invention have the advantages of high fluorescence intensity, low raw material costs, amature production process, no biological toxicity or environmental pollution, good water solubility or water dispersion, fluorescence performance which is not restricted by a solution concentration and a solid form, various application forms, a simple preparation method easy to implement and extremely-easy industrial promotion; and the blue fluorescent polymer, the blue fluorescent powder, the blue fluorescent fibers and the ultraviolet conversion into blue resin have broad application prospects in the fields of anti-counterfeiting technologies, biological imaging, light-transfer films, solarcell sealants and fluorescent dyes.

The invention discloses a preparation method of high-color-value antimicrobial water soluble functional red yeast rice. The preparation method is capable of solving a problem that the color value of water soluble functional red yeast rice products is low, and the introduction of carboxylation chitosan is capable of endowing the high-color-value water soluble functional red yeast rice with bacteriostatic activity. The preparation method comprises key steps such as early stage fermentation of the functional red yeast rice, processing of materials after fermentation, a second time of fermentation of the functional red yeast rice, processing of fermentation broth and acquisition of the high-color-value antimicrobial water soluble functional red yeast rice. Drying efficiency is high, product quality is stable, the color value and solubility are high, the high-color-value antimicrobial water soluble functional red yeast rice possesses bacteriostatic activity, and application value of the high-color-value antimicrobial water soluble functional red yeast rice is excellent.

The invention relates to the field of soil improvement, in particular to a soil improvement method. Idle land is deep plowed, inorganic adsorbents, chelating agents and biological adsorbents are uniformly applied, the land is leveled and properly irrigated, and the treated land is idled for four to six months and then can be used for planting again. The method is short in soil improvement period, rapid in effect, moderate in improvement cost and high in land applicability. The method has the advantages that soil pollution states can be rapidly improved, heavy metal pollution improvement effects are the best, soil permeability water-retaining properties are improved, soil carbon sink is increased, pesticide residues and heavy metal of soil are degraded to meet organic planting requirements, organic conversion of the soil can be rapidly finished, the soil improvement period is short, the effects are rapid, cost can be controlled, organic planting standards can be met basically within six months, bad conditions of the soil are improved, the quality of planted food is directly changed, and fitness of people is benefited.

The invention discloses a purifying method of condensed water. The purifying method comprises the steps of adopting a honeycomb-shaped carrier type inorganic carbon membrane assembly to carry out at least one stage of membrane filtering treatment on high-temperature condensed water, wherein the filtering accuracy of the membrane assembly treated by membrane filtering is 0.001-100mum, and preparing the boiler supplementing water suitable for recycling. The purifying method disclosed by the invention has the advantages that the filtering accuracy is high, the membrane flux of a honeycomb-shaped carrier type membrane core is large, the impact resistance of incoming water is strong, the resistance to oil pollution is strong, the integration level of the membrane core structure is high, the preparation method is simple, a complex online discrimination system is not needed, and the prepared condensed water is stable in quality and high in temperature, meets the requirement on water quality of the boiler supplementing water and saves a great amount of heat.

The invention discloses a preparation method of a permeable reaction wall filled with microorganisms fixed by biological carbon, and belongs to the field of groundwater pollution remediation. The permeable reaction wall provided by the invention comprises a four-layer structure comprising a coal cinder water inlet layer, an iron powder mixed filler layer, a fixed microorganism layer and a coal cinder water outlet layer, wherein the coal cinder water inlet layer, the coal cinder water outlet layer and the iron powder mixed filler layer can be used to achieve a purpose of reducing dissolved oxygen in water; biological carbon is used for preparing fixing particles of degrading bacteria in the fixed microorganism layer; the biological carbon is mixed with quartz sand, and then the obtained mixture fills the permeable reaction wall; and the coal cinder water outlet layer is added downstream. Pollutants in underground water can be degraded by applying fixed anaerobic microorganisms, so thatstrain loss is reduced, and sewage treatment efficiency can be improved. In addition, the permeable reaction wall is low in cost, low in microorganism loss, high in activity and high in impact resistance, and can be applied to anaerobic microorganisms.

The invention discloses an anti-microbial contamination hollow fiber membrane and a preparation method thereof, belongs to the technical field of membranes, and particularly relates to an anti-contamination polymeric membrane technique. The anti-microbial contamination hollow fiber membrane contains carbon nanotubes; and the mass ratio of polyvinylidene fluorid (PVDF) to carbon nanotubes is 1:0.001 to 1:0.01. Compared with the conventional PVDF hollow fiber separation membrane preparation, the product disclosed by the invention can be produced without special equipment and the industrial implementation is easy; in a word, the process is simple and the increase in the cost of the membrane is low. The hollow fiber separation membrane product has high attachment inhibition effect on microbesin separation media, and has high microbial contamination resistance.