34results about How to "Small surface pore size" patented technology

The invention discloses a preparation method of a porous polyurethane film with a gradient porous structure. The preparation method is characterized by comprising the following steps: adding polyurethane into a solvent for dissolving, adding a pore-foaming agent, and mechanically stirring for a period of time to obtain suspension; defoaming the suspension in vacuum, carrying out film casting on a mold, carrying out curing film formation in absolute ethyl alcohol coagulation bath, soaking the film in deionized water to dissolve the pore-foaming agent and completely remove the pore-foaming agent; taking out the film, drying the film in a blast oven to obtain the porous polyurethane film with the gradient porous structure, the upper and lower surfaces of the porous polyurethane film are trim and not curled, and the hand feeling is good. The film can be used as artificial skin and has the advantages of good water and air permeability, high water absorption, excellent mechanical properties, good biological affinity, etc.

The invention discloses an alumina particle-filled composite multi-arc hole membrane material. With polyimide (PI) nanofiber nonwoven fabric as a base material, holes of the base material are filled with micro-nano Al2O3 particles; the diameters of the micro-nano Al2O3 particles are 50-800nm; and the micro-nano Al2O3 particles account for 20%-50% of total weight of the composite multi-arc hole membrane material. According to the micro-nano composite multi-arc hole membrane material, the porosity is 30%-60%; the surface mean pore size is 50-800nm; and the thicknesses are 10-40 microns. The micro-nano composite multi-arc hole membrane material disclosed by the invention has high-temperature resistance, heat shrinkage resistance, high-voltage and high-current shock resistance and mechanical impact resistance, and is suitable for manufacturing various high-capacity and high-power lithium batteries or super-capacitors as a safety battery diaphragm and a safety super-capacitor diaphragm. The invention further provides a preparation method of the nano composite multi-arc hole membrane material, and an application of the nano composite multi-arc hole membrane material as the battery diaphragm.

The invention disclose a functional composite dressing with drug sustained release and self-antimicrobial effects and a preparation method thereof, belongs to the technical field of medical devices, and solves the technical problems that the existing polyurethane foam dressing has low tendency to breed bacteria, cannot be used for a long time, and has low tendency to adhere with granulation. The functional composite dressing is composed of a wound contact layer, a foam absorbing layer and an external protective layer arranged orderly from inside to outside, wherein the wound contact layer is acomposite material of a slow release medicine and degradable polylactic acid, and the surface of the wound contact layer contains permeation micropores; the foam absorbing layer is an aqueous polyurethane foam material, and the foam absorbing layer has an open cell unit. The external protective layer is thermoplastic polyurethane with a dense surface. The dressing has excellent antimicrobial effect, has low tendency to adhere to a wound, is low in frequency of dressing change, increases the comfort of patients while reducing the degree of skin scars, and is especially suitable for the treatment of wounds caused by device trauma, burns, bacterial fester and ulceration and other reasons.

The invention discloses a preparation method of a high-flux antifouling composite filter membrane. The preparation method comprises the steps: dissolving a polymer material into a solvent to prepare an electrospinning solution; then, carrying out electrospinning to obtain nanofibers; next, carrying out cold pressing to obtain a nanofiber-based membrane; dissolving a polyelectrolyte into a solventto prepare a coating solution; then, coating the nanofiber-based membrane with the coating solution, and carrying out standing and drying in the shade at room temperature to obtain a nanofiber-based composite membrane with the surface being provided with a complete cortical layer; and then, soaking the nanofiber-based composite membrane into a dye with charges being opposite to those on the surface cortical layer to obtain the high-flux antifouling composite filter membrane. According to the preparation method, a "pollution layer" of the dye is used as a constituent part of a functional barrier layer of the composite membrane, so that the prepared composite filter membrane simultaneously has a good antifouling effect and high permeability, and the preparation method is simple and easy, environment-friendly, capable of realizing fine regulation of the pore diameter on the surface of the functional barrier layer of the composite membrane and suitable for large-scale production.

The invention discloses an oral slow release preparation, an entrapment material and a preparation method. A sodium alginate-sodium hyaluronate mixture is taken as an entrapment material; and a prepared protein polypeptide medicament oral slow release preparation consists of the following components in percentage by mass: 0.5-10 percent of medicament and 90-99.5 percent of sodium alginate-sodium hyaluronate mixture. According to the oral slow release preparation, the conventional administration way of a protein polypeptide medicament is changed, the acting time of the protein polypeptide medicament is prolonged, the normal blood sugar level is maintained successfully for 12 hours when exenatide oral microspheres are taken as an example, the administration compliance of a diabetes patient is improved remarkably, and the treatment effect is enhanced.

A method for making a palladium film on the surface of a macro-porous carrier comprises the following steps: covering the surface of a porous carrier with an organic modification layer through an immersion coating technology, pre-coating the surface of a polyvinyl alcohol modification layer with a layer of palladium crystal seeds by using a sensitization-activation technology, making a palladium film on the surface of the organic modification layer through a chemical plating technology, and carrying out high-temperature thermal treatment under the protection of inert atmosphere to remove the organic modification layer in the palladium composite film in order to obtain the palladium film with good hydrogen permeability. The porous carrier is modified with an organic material, so the surface roughness of the carrier is effectively improved, and the surface aperture of the carrier is reduced; and simple thermal treatment is carried out after chemical plating of the palladium film to remove the organic modification layer, so resistance of the modification layer to hydrogen transfer is avoided. The method has the advantages of simplicity, agility, easy operation and strong practicality.

The invention discloses a polytetrafluoroethylene nanoparticle (PTFE-NP)-filled composite tortuous porous membrane material. With polyimide (PI) nanofiber nonwoven fabric as a base material, holes of the base materials are filled with polytetrafluoroethylene nanoparticles (PTFE-NPs); the PTFE-NPs are 100-300nm in diameter and account for 30%-60% of total weight of the composite tortuous porous membrane material; and the PI nanofiber nonwoven fabric is electrospinning PI nanofiber nonwoven fabric of which the thickness is 9-38 microns, the porosity is 60%-80% and the fiber diameters are less than 0.5 micron. The nano composite tortuous porous membrane material disclosed by the invention has the advantages of high temperature resistance, heat shrinkage resistance, high voltage impact resistance, high current impact resistance and mechanical impact resistance, and is suitable for manufacturing various high-capacity and high-power lithium batteries or super capacitors as a safe battery diaphragm and a safe super capacitor diaphragm. The invention further provides a preparation method of the nano composite tortuous porous membrane material and an application of the composite tortuous porous membrane material as a battery diaphragm.

The invention discloses a palladium composite membrane taking multihole FeAlCr as substrate and a preparation method thereof. The palladium composite membrane is composed of a multihole FeAlCr substrate tube, a home position oxidation layer, a ceramic transition layer and palladium alloy membrane. The preparation process thereof includes the following steps: firstly, a multihole FeAlCr substrate tube is prepared; secondly, home position oxidation is adopted to form a dense home position oxidation layer on the surface of the multihole FeAlCr substrate tube; thirdly, a ceramic transition layer is coated; fourthly, palladium alloy is coated on the surface of the multihole FeAlCr substrate tube provided with the ceramic transition layer, and heat treatment is carried out, so as to form palladium alloy membrane, thus obtaining the palladium composite membrane. The preparation process of the invention is simple, and design is reasonable. The palladium composite membrane which takes multihole FeAlCr as substrate and is prepared by adopting the invention has high hydrogen permeability, strong hydrogen corrosion resistance and long service life, can be effectively applied to purification and separation of hydrogen and is especially applied to purification and separation of hydrogen isotope.

The invention discloses a micro-nano composite multi-curved-pore membrane material. The polyimide (PI) nanofiber non-woven fabric is taken as the base material; the pores of the base material are filled by silicon dioxide particles; the diameter of the micro-nano silicon dioxide particles is 50-800 nm, accounting for 20-50% of the total weight of the micro-nano composite multi-curved-pore membrane material; and the PI nanofiber non-woven fabric is 9-38 um in thickness, and 60-80% in the porosity. The micro-nano composite multi-curved-pore membrane material prepared by the invention is high temperature resistant, thermal shrinkage resistant, high voltage resistant, high current impact resistant, and mechanical collision resistant, and suitable for being used as safe battery membranes and safe supercapacitor membranes for manufacturing various high-capacity and high-power lithium ion batteries or supercapacitors. The invention also provides a preparation method for the micro-nano composite multi-curved-pore membrane material, and application of the membrane material in being used as the battery membranes.

The invention discloses a nanocomposite multi-curved-porous membrane material. The nanocomposite multi-curved-porous membrane material takes polyimide (PI) nanofiber non-woven fabric as a base material, and nanometer zirconium dioxide (ZrO2) particles are filled in pores of the base material; the diameter of the nanometer ZrO2 particles is 50-100 nm, and the weight of the nanometer ZrO2 particles is 30-50% of the total weight of the nanocomposite multi-curved-porous membrane material; the thickness of the PI nanofiber non-woven fabric is 9-38 um, and the porosity is 60-80%. The nanocomposite multi-curved-porous membrane material has high-temperature resistance, thermal shrinkage resistance, high voltage and high current impact resistance, and mechanical collision resistance, so that the nanocomposite multi-curved-porous membrane material is suitable for being used as safety battery membranes and safety supercapacitor members for manufacturing various high-capacity and high-power lithium batteries or supercapacitors. The invention further provides a preparation method for the nanocomposite multi-curved-porous membrane material, and an application of the nanocomposite multi-curved-porous membrane material in being used as the battery membranes.

The invention discloses a high-strength antibacterial polyethylene film and a preparation method thereof. The polyethylene film is a film formed by taking a polyethylene microporous film as a substrate and an ethylene-vinyl alcohol copolymer film as a surface layer and chemically bonding the polyethylene microporous film and the ethylene-vinyl alcohol copolymer film through polyvinyl alcohol. The high-strength antibacterial polyethylene film has the beneficial effects that a pomegranate extracting solution is added, so that the bonding strength and the antibacterial property are improved; an ethylene-vinyl alcohol copolymer film is prepared as a surface layer by using a water-induced reversed-phase method, and the precipitation of PVP is accelerated and the formation of pores is accelerated by using the synergistic effect between polyhexamethylene guanidine propionate and PVP, so that the time cost is reduced; acid groups in the polyhexamethylene guanidine propionate are utilized, so that the polyhexamethylene guanidine propionate/metal nanoparticles spontaneously move towards the surface of the film to form a hydration layer, and the film is antibacterial and antifouling; and the chelating property of the polyhexamethylene guanidine propionate on the metal nanoparticles is utilized, the polyhexamethylene guanidine propionate is attached to the surfaces of the metal nanoparticles, agglomeration of the metal nanoparticles is inhibited, and the uniform dispersity is improved.

The invention discloses a reverse osmosis membrane with a PE microporous membrane as a base material and a preparation method of the reverse osmosis membrane. The reverse osmosis membrane comprises the PE microporous membrane, a polysulfone layer coating the PE microporous membrane and a polyamide layer coating the polysulfone layer, the pore diameter of the PE microporous membrane is 0.01-10 microns, the porosity is 70-95%, and the thickness is 20-120 microns. The PE microporous membrane is small in aperture and excellent in homogeneity, the surface of the PE microporous membrane is coated with the polysulfone layer, and due to the fact that organic solvents such as DMF, DMAc, NMP or DMSO are adopted during polysulfone coating, the PE microporous membrane is easily dissolved in the solvents, the PE microporous membrane can be subjected to permeation etching, and the aperture of the surface of the polysulfone layer becomes small and is more uniform. The pore diameter of the polysulfone layer is more uniform, so that the defects of the polyamide layer in the polymerization process are reduced, the polyamide layer is more uniform, and the performance is more excellent. The prepared reverse osmosis membrane has excellent water flux and rejection rate.

The invention discloses a carbon dioxide adsorption material and a preparation method thereof. The chemical property of the surface of the carbon material is easily influenced by heteroatoms, a nitrogen-containing functional group can show a special hydrogen-bond interaction, and the interaction between carbon dioxide and the functional group is increased by hydroxyl through the hydrogen-bond interaction and electrostatic potential, so that the adsorption of carbon dioxide is facilitated. The carbon dioxide adsorption provided by the invention is obtained by activating the carbon nanotubes in an acidic system and carrying out plasma modification. The carbon nanotube material is subjected to plasma modification, the number of surface micropores of the obtained carbon dioxide adsorption material is increased, the surface aperture is reduced, and the carbon dioxide adsorption capacity of the carbon dioxide adsorption material is remarkably improved. In addition, through plasma modification, the number of nitrogen-containing functional groups of the carbon nanotube material is increased, the electron density of the carbon surface is increased, the surface polarity is increased, and therefore the carbon dioxide adsorption amount is increased.

The invention discloses a preparation method of a multi-hole metal tube surface zirconia intermediate layer. The preparation method comprises the following steps of mixing zirconium powder and water or absolute ethyl alcohol, evenly stirring to prepare powder suspension; enabling two ends of a multi-hole metal tube to be connected with a circulation water type vacuum pump through flexible tubes, then immersing the multi-hole metal tube in the powder suspension, opening the circulation water type vacuum pump to suck under negative pressure, holding the zirconium powder in the powder suspension on the surface of the multi-hole metal tube, forming a layer of zirconium film, and finally airing at room temperature; igniting one end of the zirconium film until combustion reaction spreads to the other end of the zirconium film to obtain the multi-hole metal tube surface zirconia intermediate layer. The preparation method does not need large scale equipment and is simple in process, simple and convenient to control, energy-saving and environment-friendly, and the multi-hole metal tube surface zirconia intermediate layer prepared by the preparation method can effectively reduce surface hole diameter of the multi-hole metal tube, improve bond strength of a zirconia film and the multi-hole metal tube and prolong service life of palladium composite film.