109results about How to "Good hydrophilic" patented technology

A process for catalytic synthesis of the low-carbon alcohol ester of fatty acid from immobilized lipase includes such steps as immobilizing lipase to inertial carrier membrane or fabric, combining it with metallic wire mesh to form novel reactor, and catalytic esterifying reaction between fatty acid and alcohol at 20-60 deg.C for 14-24 hr. Its advantages are high esterifying rate up to 90-97%, less by-product and low energy consumption.

The invention discloses a carbon nano tube / polyaniline / polysulfone composite ultra-filtration membrane and a preparing method of the membrane, i.e. the carbon nano tube / polyaniline / polysulfone composite ultra-filtration membrane is prepared by using polysulfone as a matrix membrane formation material and a carbon nano tube reinforced polyaniline nano-fiber as a filler through solvent commixing phase transfer. The preparing method of the carbon nano tube / polyaniline / polysulfone composite ultra-filtration membrane provided by the invention is simple in structure, strong in operability and low in cost; the electric conductivity of the carbon nano tube / polyaniline / polysulfone composite ultra-filtration membrane can be 0.1S / cm, the retention rate of bovine serum albumin is 39.8-73.7%, the contact angle of the water is reduced to be minimum 32.6 degrees, while the pure water flux is 7.3 times of a pure polysulfone membrane, and the membrane can be used in application fields, such as protein isolation, medicine terminal filtration, industrial waste water treatment and the like.

The invention relates to a filter screen capable of realizing efficient oil-water separation, and a method for preparing the filter screen by femtosecond laser, belonging to the field of function materials. The method concretely comprises the following steps: putting a hydrophilic thin-film material having the thickness within the range of 50-100 microns onto a movable translation platform, enabling the femtosecond laser to be focused onto a material surface through a plano-convex lens, and controlling the parameters such as energy, pulse number and the like of the femtosecond laser; processing a micro through hole array in the thin-film material, wherein the aperture range of the micro through hole array is 40-70 microns, and controlling the distances among the micro holes to be within the range of 100-300 microns by the movable translation platform; completing the processing to obtain the filter screen capable of realizing efficient oil-water separation. The oil-water separation filter screen provided by the invention is wide in material source, low in price as well as simple and efficient in the preparation technology; the prepared filter screen has a good oil-water separation effect for different oil-water mixed liquids, the oil-water separation efficiency reaches up to 99%, and the processed filter screen has good stability and can be repeatedly used for more than 50 times.

A process for producing biological diesel oil by fixed enzyme method is carried out by taking sodium alginate, kaoline, glutaraldehyde, gelatin and lactose as co-fixer, fixing the lipase, piling the spherical fixed enzyme in filled bed columnar reactor naturally, alcoholyzing animal and plant oil fatty with biological diesel oil as solvent and producing biological diesel oil. It is cheap, has less consumption and by product and better quality. It can be used for continuous production.

The invention discloses a method for preparing an aluminium alloy-loaded titanium dioxide nano tube film, belonging to the field of nano films. The method comprises the following steps of: (1) carrying out electrochemical polishing on an aluminium alloy with perchloric acid and an ethanol solution; (2) carrying out anode oxidation treatment on the aluminium alloy, wherein an electrolyte solution is mixed solution of H3PO4 or H3PO4 and H2SO4; (3) taking an aluminium oxide nano tube array prepared by anode oxidation as a template, cleaning with deionized water and drying; (4) preparing liquid phase deposition solution (NH4)2TiF6; (5) placing the anode aluminium oxide nano tube array template in the liquid phase deposition solution to be subjected to standing and deposition, cleaning with the deionized water after the template is taken out, and drying; and (6) carrying out heat treatment on the deposited film at the temperature of 400-600 DEG C and insulating for 2-4 hours, and cooling to room temperature along with a furnace, thus the film is prepared. The TiO2 nano tube film prepared by the invention has high abrasive resistance and excellent photocatalysis bacteriostatic, super hydrophilic and self-cleaning performances.

The invention belongs to the technical field of composition coatings and particularly relates to an antibacterial hydrophilic coating. The technical problem to be solved by the invention is to provide a coating having better antibacterial and hydrophilic effects. In order to solve the problem, according to the technical scheme, the antibacterial hydrophilic coating comprises the following components in percentage by weight: 30-50% of water-soluble acrylic resin, 3-10% of alcohols or ethers or ethers, 0.5-5% of a curing agent, 0.1-1% of a surfactant, 0.1%-1% of metals and antibacterial agents of oxides of metals and the balance of water. After a prime coating is subjected to high temperature curing and film forming, the combination of good antibacterial and hydrophilic functions is achieved.

The method of catalytically synthesizing vitamin A fatty ester with immobilized lipase includes mixing substrate vitamin An acetate and C10-C18 fatty acid or fatty ester in the molar ratio of 1 to 1-7 as well as organic solvent and immobilized lipase in the amount of 0.2-5 times weight of vitamin An acetate for reaction under 20-50 deg.c for 9-50 hr; taking out the immobilized lipase; filtering the reacted liquid and crystallizing to obtain vitamin A fatty ester. The organic solvent is C6-C10 saturated alkane containing water in 0-1 %; and the immobilized lipase is yeast type lipase on carrier of diatomite, resin or fabric membrane. The immobilized lipase of the present invention has the features of great catalysis area, high catalysis efficiency, high stability, capacity of being reused, etc. The reaction solvent has no toxicity, and the product is light in color and high in quality.

The invention discloses a yarn fiber reinforced double-layer tubular filtering membrane. The tubular filtering membrane has a double-layer structure, wherein the inner layer is a first polymer membrane, while the outer layer is a second polymer membrane; and yarn fibers distributed in parallel are arranged in the inner layer or the outer layer for mechanically reinforcing the tubular filtering membrane. The tubular filtering membrane provided by the invention is obviously improved in transverse compression resistance and blast resistance as well as membrane safety while having excellent axial mechanical properties; and the tubular filtering membrane with excellent overall performance for external-compression type filtering or internal-compression type filtering by adjusting the distribution positions of the yarn fibers and the double-layer structure and the properties of the membrane. The invention also discloses a method for preparing the tubular filtering membrane; and the two-layer synchronous coextrusion technique is employed, so that the production efficiency of the membrane can be effectively improved and the preparation cost of the tubular filtering membrane can be reduced.

The invention discloses blended non-woven fabric and a preparation technology thereof. The blended non-woven fabric comprises the preparation raw materials of degummed silk protein fiber and degummed natural vegetable fiber, wherein the mass ratio of the degummed silk protein fiber to the degummed natural vegetable fiber is (20:80) to (80:20). The blended non-woven fabric not only has the advantages of softness, skin protection and skin favorableness of silk, but also has the elasticity and water absorption of fiber. The blended non-woven fabric is simple in preparation technology, and can be widely applied to industrials of facial masks, sanitary towels, sanitary pads, paper diapers, cosmetics, respirators, hygienic products and medical supplies.

The invention discloses linear amphiprotic carboxyl-terminated polyether amino silicon oil. The linear amphiprotic carboxyl-terminated polyether amino silicon oil is prepared from a mixture prepared from amine-terminated polyether silicon oil and dicarboxylic anhydride, wherein the amine-terminated polyether silicon oil is prepared from a mixture prepared from epoxy-terminated polyether silicon oil, polyether amine and isopropanol. The invention also discloses a cross-linking amphiprotic carboxyl polyether amino silicon emulsion softening agent prepared based on the linear amphiprotic carboxyl-terminated polyether amino silicon oil and a preparation method thereof. According to the linear amphiprotic carboxyl-terminated polyether amino silicon oil, the cross-linking amphiprotic carboxyl polyether amino silicon emulsion softening agent and the preparation method of the cross-linking amphiprotic carboxyl polyether amino silicon emulsion softening agent, disclosed by the invention, cross-linking amphiprotic carboxyl polyether amino silicon oil is prepared into a silicon emulsion softening agent by using a non-ionic surfactant, and the silicon emulsion softening agent is used for fabric after-treatment, so that the soft hydrophilic performance and the hand feeling of fabric can be improved, and good elasticity and good one-bath using performance can also be given to the fabric.

The invention provides an amphipathic three-block polymer PS(x)MAA(y)-g-fPEG(z) modified PVDF ultrafiltration membrane and a preparation method thereof. PS(x)MAA(y)-g-fPEG(z) is used as an additive for modifying PVDF to obtain the amphipathic three-block polymer PS(x)MAA(y)-g-fPEG(z) modified PVDF ultrafiltration membrane. The amphipathic three-block polymer PS(x)MAA(y)-g-fPEG(z) modified PVDF ultrafiltration membrane is prepared by adopting an immersion precipitation phase inversion method, the modified membrane can keep long-time stability. According to the method, the adopted additive is prepared by simple free radical polymerization and normal temperature esterification reaction, the operation is simple, the use rang is wide, and compared with the prior art, the method is few in operation steps, simple and convenient to operate, low in cost and easy to implement in commercial production; as a PS chain section in the additive-PS(x)MAA(y)-g-fPEG(z) has good compatibility with PVDF, the modified membrane is relatively stable in the using process and not liable to disappear; an MAA(y) chain section in the additive-PS(x)MAA(y)-g-fPEG(z) is enriched on the surface of the PVDF, so that the hydrophily of the modified PVDF membrane is good, the contact angle of the membrane with water is small, the water drop seepage velocity is high, and tight contact of pollutants on the surface of the membrane is prevented.

The invention provides a self-cleaning photocuring antifogging paint which is prepared from the following raw materials in parts by mass: 3-8 parts of modified graphene nano particle, 20-80 parts of hydrophilic photosensitive resin, 5-20 parts of photoinitiator, 15-40 parts of diluter and 1-3 parts of curing accelerator. The invention also provides a preparation method of the self-cleaning photocuring antifogging paint. Compared with correlation techniques, the method provided by the invention has the following advantages: the graphene surface is subjected to hydrophilc modification to endow the graphene with favorable hydrophilicity and dispersity, and the graphene has favorable compatibility with the photosensitive resin, thereby greatly enhancing the strength wear resistance of the coating; the cation organic monomer modified hydrophilic resin can effectively inhibit the bacteria on the coating surface from generation, and has favorable self-cleaning property; the cured paint forms a crosslinked network, so that the adhesion, hardness, frictional resistance, water resistance and other mechanical properties are enhanced, and the cured paint can resist fog for a long time; and the paint is baked at low temperature, and is applicable to various substrates.

The invention relates to a high-strength plastic valve well, and aims at providing a high-strength plastic valve well which is convenient to use. The valve well comprises a well body and a well cover component, wherein the well cover component comprises an inner cover and an outer cover; the inner cover is directly connected with the well body; a stepped recess is arranged on the outer surface of the inner cover; and a card is arranged on a step table of the stepped recess, so as to form a handle which is convenient to uncover. The high-strength plastic valve well disclosed by the invention is durable in use, corrosion-resistant, low in cost, simple and reasonable in structure design, high in strength, and convenient to use due to a specially designed handle structure; materials are saved; damages in transportation and installation can be avoided; water leakage is prevented; and the modified sheet mold plastic material is high in strength, simple in formula and convenient to process.

The invention provides a nano-micelle drug carrier based on a vitamin E derivative, a nano-micelle drug composition as well as a preparation method and application of the nano-micelle drug composition. The nano-micelle drug carrier based on the vitamin E derivative is a nano-micelle formed by D-alpha-tocopherol polyethylene glycol 1000 succinate, D-alpha-tocopherol polyethylene glycol 2000 succinate and alpha-tocopherol succinate; and the carrier entraps a hydrophobic anti-tumor drug to obtain the nano-micelle drug composition. The D-alpha-tocopherol polyethylene glycol 1000 succinate, D-alpha-tocopherol polyethylene glycol 2000 succinate and alpha-tocopherol succinate are matched with one another and cooperate, so that the formed nano-micelle is good in stability, is small and uniform in grain size, improves drug encapsulation efficiency, has relatively good P-glycoprotein inhibiting ability, has good anti-tumor effect, is small in toxicity to normal cells and has good biocompatibility. The preparation method is simple and is wide in application prospect.

This invention discloses a kind of selfemulsifying alkyd resin and its producing method. This invention chooses compounds of many kinds of polyalcohols and organic acid as its raw material, adopts epoxy group and non-hydroxy and non-carboxyl hydrophile gene into the alkyd, enlarges the structure of rosin, improves its alkali tolerance, reduces the acid price of the rosin and has strong hydrophilicity and selfemulsifying. When confecting printing ink, you don't need to add emulsifying agent, which decrease the production cost. It possesses relatively good alkali tolerance and has better emit than ordinary alkyd resin. It is a kind of ideal printing ink of intaglio printing.

The invention provides a polymeric dispersant which comprises a block polymer of methyl methacrylate, butyl acrylate and acrylamide. A herbicide composition which is prepared from the polymeric dispersant and contains propisochlor and atrazine and a preparation method thereof are provided. The herbicide composition comprises, by weight, 29% of the propisochlor, 29% of the atrazine, 4% of the polymeric dispersant, 4% of ethanediol, 0.2% of defoamer, 0.05% of xanthan gum, 0.1% of aluminium-magnesium silicate, 0.1% of sodium benzoate and the balance deionized water. The herbicide composition containing the propisochlor and the atrazine and the preparation method thereof have the advantages of being high in content and good in weeding effect.

The invention discloses a novel guide wire applicable to clinical intravascular interventional therapy and a manufacturing method of the guide wire. The guide wire comprises a nickel-titanium memory alloy wire core rod, a tungsten-wire spring and a polymer outer coating layer, wherein a conical spring sleeving part is disposed at the front end of the nickel-titanium memory alloy wire core rod, the tungsten-wire spring sleeves the spring sleeving part, and the front end and the rear end of the tungsten-wire spring are fixed on the spring sleeving part through PU glue; the polymer outer coating layer sleeves the nickel-titanium memory alloy wire core rod and the tungsten-wire spring after the tungsten-wire spring sleeves the spring sleeving part; a hydrophilic coating coats the surface of the polymer outer coating layer. The novel guide wire applicable to the clinical intravascular interventional therapy has the excellent pushing performance of a spring guide wire, has extremely good X-ray traceability, and has the advantages of small vascular irritation, good blood and biological compatibility and easiness in blood vessel passing of a polymer super-smooth guide wire.

This invention relates to a preparation method for square and needle-like nano-titanium dioxide with nanometer microcrystalline cellulose as crystallization inducer. The method comprises preparing nanometer microcrystalline cellulose dispersing solution with concentration of 0.01-5 wt.%, adding additive, ultrasonic-treating, adding titanium tetrachloride into the dispersing solution, wherein the weight ratio of nanometer microcrystalline cellulose to titanium tetrachloride is 1:1-1:150, stirring at 20- 120DEG C for 2-15 hours, and regulating these conditions to obtain square, needle-like nano-titanium dioxide. The invention has the advantages of cheap raw materials, simple process, easy operation, good repeatability, mild reaction conditions, low temperature, short response time, and no torrefaction. Through regulating conditions, the morphology of titanium dioxide can be controlled, achieving regular size distribution and morphology. The nano-titanium dioxide can be widely used in photoelectric materials, decorative materials, and the environmental catalytic materials.

The invention discloses an outdoor ecological and environment-friendly ceramic tile with antibacterial and self-cleaning functions and a preparation method of the ceramic tile. The ceramic tile comprises a green body and a nano titanium dioxide film covering the front side of the green body, wherein the green body is prepared from components in parts by weight as follows: 15-20 parts of potassium-sodium feldspar A, 8-12 parts of hard high-aluminum clay, 15-20 parts of potassium-sodium feldspar B, 15-20 parts of potassium-sodium feldspar C, 10-15 parts of kaoline, 10-15 parts of Guangxi white mud, 1-2 parts of talc, 4-8 parts of bentonite and 10-15 parts of high-plasticity clay. By means of double processes of high-temperature calcination and low-temperature spraying, the nano titanium dioxide film with a certain thickness is obtained on the surface of the ceramic tile, the product can completely kill bacteria on the surface under the irradiation of light, and the outdoor ecological and environment-friendly ceramic tile has antibacterial and sterilization effects.

The invention discloses a grain-free metal printing plate base. The grain-free metal printing plate base comprises a metal plate material, an adhesive layer and a hydrophilic layer; the mass of inorganic particles accounts for 90% or more of that of the hydrophilic layer; the surface of the hydrophilic layer is subjected to hole sealing treatment by using a hole sealing material; the adhesive layer is formed by drying and curing after the metal plate material is coated with a coating liquid with great adhesive force to the metal plate material; the hydrophilic layer is formed by drying and curing after an inorganic nano or micro particle with a small amount of an adhesive is coated with a coating liquid. A preparation method for the grain-free metal printing plate base disclosed by the invention avoids the defects of high energy consumption and high pollution of the conventional grain plate base, can effectively reduce cost, and can be applied to the printing fields, such as a PS plate or a CTP plate.

The invention discloses a preparation method of a super-hydrophilic functional membrane. The preparation method comprises the following steps: firstly, taking titanate sol as a TiO2 precursor, acetylacetone as a complexing agent and a non-metal dopant as a modifier to prepare the modified TiO2 sol, then performing reflux ageing on tetraethoxysilane, KH560 solution, ethanol and deionized water to obtain SiO2 sol, then adding the prepared SiO2 sol into the modified TiO2 sol to obtain SiO2-TiO2 sol, coating the SiO2-TiO2 sol with film, and carrying out heat treatment to prepare SiO2-TiO2 super-hydrophilic functional membrane. The preparation method disclosed by the invention is simple and feasible, efficient and environment-friendly, and the reaction process is easy to control and is suitablefor industrial production; the prepared super-hydrophilic functional film is rough in microscopic surface, small in contact angle and high in hydrophilicity, the super-hydrophilicity can be respondedunder the action of visible light and can be kept for a long time under the irradiation of visible light.

The invention relates to a method for preparing cyclohexanone-oxime from cyclohexanone through liquid-phase ammoximation. The method includes the following steps that cyclohexanone, ammonia water, hydrogen peroxide, a catalyst, a surfactant, solvent and cosurfactant are added into a reactor and react for 2.5-4.5 h on the stirring condition at the temperature of 55 DEG C-80 DEG C; after the reaction is finished, cyclohexanone-oxime is obtained when the temperature falls to the room temperature; the catalyst is zirconium hydrogen phosphate or titanium hydrogen phosphate. The problems of equipment corrosion and generation of a great number of useless ammonium salt side products are solved by using the catalyst, the conversion rate of cyclohexanone can reach 95.3%, and the yield and selectivity of cyclohexanone are 69.1% and 72.5% respectively.

The invention provides a 3D printing molding material which consists of the following components: graded modified aluminum oxide powder, yellow dextrin powder and an adhesive, wherein the adhesive accounts for 5-50% of the mass of the molding material; the amount ratio of the graded modified aluminum oxide powder to the yellow dextrin powder is (65-97):(15-25). An aluminum oxide ceramic made of the molding material after sintering is of a micro-pore structure which is high in pore rate, uniform in aperture and controllable in distribution, in addition, the sintering shrinkage rate of the material is low, the size and the shape of the material can be maintained, and cracking can be avoided.

The invention relates to a method for preparing rosin amine polyoxyethylene ether by spraying method. The reaction is divided into two steps: the first step is to inhale disproportionated rosin amine into a spray reactor, and when heated to 50-60°C, inhale phosphorous acid and pump while Raise the temperature to 170-180°C under vacuum, control the pressure in the kettle to 0.2-0.3Mpa, close the vacuum valve, turn on the magnetic circulation pump, the material is sucked out from the kettle and then sprayed into the kettle, and the valve of ethylene oxide is opened, the material and epoxy Ethane is sprayed out at the same time, such a circular reaction for 0.8-1.5 hours, heat preservation for 30-40 minutes, and cooling to 90-100 °C; the second step is to vacuumize the inside of the above-mentioned kettle, while inhaling potassium hydroxide, while raising the temperature to 120- 130°C, keep warm for more than 20 minutes, replace the air in the kettle with nitrogen, raise the temperature to 165-175°C, close the vacuum valve, turn on the magnetic circulation pump, and spray the material and the remaining ethylene oxide into the spray reactor at the same time, so that the cycle reaction is 1 -2 hours, keep warm for more than 40 minutes. The method of the invention has short reaction time, complete reaction and good compatibility with other surfactants.

The invention provides a preparation method of a breathable comfortable moisture-absorption, sweat-releasing and cooling fabric, wherein the preparation method comprises the following steps: carrying out activation treatment of a cotton fiber through an alkali liquid, and finishing by nano chitosan, to obtain a nano material-modified cotton fiber; modifying a superfine polyester fiber by low temperature plasma, to obtain a surface-modified superfine polyester fiber; spooling, beam-warping and sizing the nano material-modified cotton fiber, the surface-modified superfine polyester fiber and a natural bamboo fiber respectively, in an air-jet loom, respectively forming an upper layer having a twill weave with three warp yarns up and one weft yarn down as a fabric structure, forming a middle layer having a plain as a fabric structure, forming a lower layer having a twill weave with two warp yarns up and one weft yarn down as a fabric structure, taking the nano material-modified cotton fiber as a connecting line, and compositing the upper surface layer, the middle layer and the lower surface layer to form a gray fabric; and carrying out dyeing, water washing and heat setting of the gray fabric to obtain the breathable comfortable moisture-absorption, sweat-releasing and cooling fabric.

The invention discloses a preparation method for super-hydrophilic foam titanium used for oil-water separation. The preparation method includes the three steps of material pretreatment, anode oxidizing treatment and ultraviolet radiation. The surface of the obtained foam titanium is composed of intrinsic hydrophilic fluorine titanium oxide and is covered with countless nano-cavities at the same time, the roughness coefficient Rq reaches 35.6 nm, and the hydrophilic performance of the surface of the foam titanium can be further enhanced. The foam titanium has good super-hydrophilicity and underwater super-oleophobicity, the water drop contact angle in air is 0 degree, the underwater oil contact angle is 160 degrees, and a good oil-water separation effect is achieved. When the filter fineness reaches 20 micrometers or below, the foam titanium can further be used for emulsion separation, and the separation efficiency can reach 99% or more. The method is easy to operate, the obtained material has good stability and super-hydrophilicity, and the oil-water separation effect is remarkable; and meanwhile, due to the fact that the titanium material has the characteristics of being nontoxic, environmentally friendly and the like, the titanium has important significance in the fields of oil-containing sewage treatment, oil recovery and the like.

The invention relates to an iron oxide red aqueous color paste for wood coating, which comprises the following components in percentage by weight: 50-70% of iron oxide red pigment, 0.5-2.0% of surface modifier, 2.0-8.0% of wetting dispersant, 0.5-2.0% of defoamer, 0.05-0.2% of thickening agent, 0.5-2.0% of thixotropic agent, 0.1-0.5% of preservative and 20-40% of water. The color paste solid content is more than or equal to 60%, and fineness is less than 20 meshes; the color paste has strong tinting strength, stable color strength, high thixotropy and big viscosity during standby; viscosity is lowered when cutting; the color paste can be stably stored and does not have the defects of water distribution, clotting and the like; the color paste does not contain resin, can be compatible with various polymer emulsions and avoids the phenomena of flooding and floating of coating; the color paste takes water as dispersion medium and protects environment. The preparation method is as follows:firstly, preparing the surface-modified iron oxide red pigment powder, then preparing color paste predisperse body by the iron oxide red pigment powder, water and other assistants, and finally grinding to obtain the iron oxide red aqueous color paste. The color paste is used for mixing scarlet and light red aqueous wood true color coating and can be mixed with aqueous yellow color paste and aqueous blue color paste to prepare aqueous wood true color coatings with other colors.

The invention provides a preparation method of a polyether-containing amphiphilic polymer / PVDF blend membrane. Specifically, firstly, amine-terminated polyether is grafted to polystyrene / maleic anhydride (SMA), and a polyether grafted SMA amphiphilic polymer is prepared; and the polyether grafted SMA amphiphilic polymer and polyvinylidene fluoride (PVDF) areblended to prepare a membrane casting solution, and the polyether-containing amphiphilic polymer / PVDF blended membrane is prepared by adopting a non-solvent induced phase inversion method. The surface and the pore wall of the membrane have polyether groups, so that the membrane shows good hydrophilicity and underwater super-oleophobic property, and polyether on the surface of the membrane has a demulsification function, so that the membrane can be used for demulsification and oil-water separation of oil extraction sewage.

The invention provides a preparation method of a pre-activated hydrophilic magnetic microsphere. Toluenesulfonyl groups are contained on the surfaces of the magnetic microspheres, EDC or glutaraldehyde activation treatment is not needed, the magnetic microspheres can be directly covalently coupled and combined with amino-containing biomolecules through the toluenesulfonyl groups, and the preparation method comprises the following steps: carrying out toluenesulfonylation modification on a hydroxyl-containing hydrophilic polymer; mixing and reacting the tosylated hydrophilic polymer with amino magnetic beads to obtain the pre-activated tosyl magnetic microspheres. The magnetic microsphere has the characteristic of pre-activation; toluenesulfonyl on the surface of the pre-activated magnetic microsphere is coupled with the magnetic microsphere through amino, the length of a spacer arm of the pre-activated magnetic microsphere is longer than that of a space arm of a common functional groupmodified magnetic microsphere, meanwhile, due to the existence of a hydrophilic polymer structure, the surface of the magnetic microsphere is hydrophilic, and lower non-specific adsorption is achievedin the application process. The method has the advantages of simple and easily available raw materials, low cost, simple process steps and very strong practicability.

The invention provides a bacterial cellulose-polyurethane composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out organic solvent exchange treatment on bacterial cellulose microfibers to obtain a compound A and a compound B of the bacterial cellulose microfibers with different concentrations; adding a polymer polyol and a diisocyanate compound under an oil bath condition to carry out an addition polymerization reaction, and carrying out a reaction to obtain a bacterial cellulose composite polyurethane foam prepolymer; and then conducting curing to obtain the bacterial cellulose-polyurethane composite material. The bacterial cellulose microfibers are compounded with the polyurethane foam material, so that the mechanical property of the composite material is remarkably improved; a large number of hydroxyl groups on the surface of the bacterial cellulose nanofiber effectively enhance the hydrophilic performance and the water absorption capacity of the composite material; and meanwhile, the good tissue affinity of the bacterial cellulose can improve the biocompatibility of the polyurethane material.