2228 results about "Pyrrolidinones" patented technology

The invention relates to the technical field of conductive materials, in particular to a high-concentration dispersion system and a preparation method thereof. The high-concentration dispersion system comprises a conductive agent, a dispersing agent, a solvent and a viscosity reduction auxiliary agent, the conductive agent is modified carbon nanotubes, the dispersing agent is modified polyvinylpyrrolidone, the solvent is N-methyl pyrrolidone or deionized water, and the viscosity reduction auxiliary agent is piperazine anhydrous; wherein the modified carbon nano tube is obtained by mixing and heating a carbon nano tube and a mixed acid solution of nitric acid and sulfuric acid, then cooling, filtering, washing, drying, then dispersing in 75% ethanol, and finally adding 3-[3-carboxyl allylamido] propyltriethoxysilane for modification; the modified polyvinylpyrrolidone is obtained by heating polyvinylpyrrolidone at 310-330 DEG C and then oxidizing the polyvinylpyrrolidone. The conductive agent content of the high-concentration dispersion system is high, the conductive agent accounts for 15%-20% of the high-concentration dispersion system by mass, and the high-concentration dispersion system is low in viscosity, high in dispersity and good in conductivity.

The invention provides a diaphragm and a preparation method thereof and a lithium ion battery, the diaphragm comprises a base membrane layer and a composite functional layer, the composite functional layer comprises hydrophobic SiO2 aerogel modified by a hydrophobic agent, a conductive ion polymer and a solid electrolyte, and the composite functional layer respectively accounts for 3-12wt%, 0.5-1.0 wt% and 0.5-1.5 wt% of the total mass of the diaphragm; the hydrophobic agent comprises trimethylchlorosilane, hexamethyldisilazane, perfluorooctyltriethoxysilane, polyvinylidene fluoride, polydimethylsiloxane and the like, the conductive ionic polymer comprises polyvinylpyrrolidone, lithium polymethacrylate, lithium polystyrene sulfonate, polyacrylamide and the like, and the solid electrolyte comprises lithium lanthanum titanium oxide, lithium lanthanum zirconium oxide, lithium lanthanum zirconium tantalum oxide and the like. The wettability is improved by the high porosity of the hydrophobic SiO2 aerogel, the stability and strong conductivity of a physical conductive network of the solid electrolyte and the ion affinity and amphoteric binding capacity of the conductive ion polymer are optimized, the electrochemical performance and thermal stability of the interface are optimized, and comprehensive optimization of the thermal-electric-interface performance of the diaphragm is realized through combination.

The invention discloses a cerium-modified manganese-based NH3-SCR (Selective Catalytic Reduction) denitration catalyst as well as a preparation method and application thereof. The catalyst is obtained by uniformly mixing and stirring manganous nitrate, cerous nitrate, polyvinylpyrrolidone, citric acid and deionized water, stirring and evaporating to a gel state, drying to form a precursor, and roasting the precursor in an air atmosphere. Ce is used for modifying MnOx, polyvinylpyrrolidone and citric acid are used as a surfactant and a complexing agent in the preparation process of the catalyst, the interaction between Ce and Mn is enhanced, the phase of the catalyst is adjusted, and under the conditions of high NOx concentration (1000 ppm) and high space velocity (GHSV = 120,000 mL h <-1 > g <-1 >), the catalyst can be used for preparing the catalyst, and the catalyst can be used for preparing the catalyst. The catalyst has excellent low-temperature catalytic activity, a wide working temperature window and good reaction stability, and has good water resistance and sulfur dioxide poisoning resistance.

The invention discloses a paper-based electrode based on liquid metal assisted laser-induced graphene and a preparation method thereof.The paper-based electrode comprises a substrate layer, a functional layer, a conductive layer and a hydrophobic layer which are sequentially arranged, the substrate layer is made of paper, the functional layer is formed by coating liquid metal nanoparticles, and the conductive layer is formed by coating liquid metal nanoparticles. The conductive layer is an electrode formed by a laser-induced graphene technology, and the hydrophobic layer is a fluid control area formed by wax packaging. According to the invention, paper is used as a substrate, liquid metal is combined with a laser-induced graphene technology, surface modification is carried out through eutectic gallium indium (EGaIn), polyimide (PI) and N-methyl pyrrolidone (NMP) composite slurry, and then a conductive electrode pattern is formed on the surface of the paper substrate by using a laser-induced graphene (LIG) technology. The method has the advantages of simple preparation, low cost, environmental friendliness and the like, and the prepared paper-based electrochemical biosensor has excellent conductivity, mechanical flexibility and electrochemical activity.

The invention provides a grinding fluid, the grinding fluid comprises a base fluid, a grinding material, nano-diamond and a dispersion stabilizer, the base fluid comprises polyether and silicone oil, the grinding material comprises surface modified silicon carbide particles, and the dispersion stabilizer comprises polyethylene glycol stearate and polyvinylpyrrolidone. The surface roughness of a grinding piece can be reduced, the scratch density and microcracks of the surface are reduced, damage of grinding fluid to the grinding piece is reduced or even avoided, and the service life of a cutter can be prolonged. The invention also provides a preparation method of the grinding fluid and a process method using the grinding fluid.

The invention discloses a high-heat-power thermoelectric cell hydrogel for low-grade heat energy collection and a preparation method thereof, and belongs to the technical field of heat energy recovery. The polyacrylamide hydrogel is selected as a substrate of the thermoelectric cell hydrogel, so that a hydrogel internal structure which is easy to regulate and control can be obtained; excellent hydrogel stretchability is obtained by using a cross-linking agent and an initiator with relatively low concentration; potassium ferricyanide and potassium ferrocyanide are used as redox ions to generate a thermoelectric effect, so that stable P-type thermal power is obtained; by using guanidine hydrochloride, the solvation entropy difference between potassium ferricyanide and potassium ferrocyanide is enlarged, and the thermal power of the hydrogel in the thermoelectric cell is greatly improved; sodium pyrrolidone carboxylate is used, so that the concentration of ions in the hydrogel is further improved, the conductivity of the thermoelectric cell hydrogel is improved, meanwhile, a hydrogen bond network between water molecules is destroyed, and the water-retaining property of the thermoelectric cell hydrogel is improved.

The invention discloses a diluent for whole blood lateral immunochromatography detection as well as a preparation method and a detection method thereof, and belongs to the technical field of immunochromatography detection. The diluent solves the technical problems of unsmooth chromatography, background interference, poor stability of detection results and the like caused by red blood cells during direct detection of whole blood samples. The diluent comprises a buffer system, an osmotic pressure regulator glycine, a nonionic surfactant polysorbate, an erythrocyte aggregation inducer polyvinylpyrrolidone, a dynamic viscosity regulator trehalose, a blocking protein, a stabilizer combination L-methionine and L-histidine, and a composite formula of water. Red blood cells are effectively induced to gather and intercept on the sample pad through the synergistic effect of all the components, and meanwhile the stability of the chromatography process and the activity of the detection reagent are maintained. The diluent is mainly used for lateral immunochromatography quantitative detection of markers such as pro-enkephalin, C-reactive protein, cardiac troponin I or N-terminal pro-brain natriuretic peptide in a whole blood sample.

The invention discloses a low-temperature vacuum microwave freeze-dried sinomenine hydrochloride preparation and a preparation method thereof in the technical field of pharmaceutical preparations, and solves the problems of long drying time, high energy consumption and poor product stability in the traditional freeze-drying technology. A vacuum microwave collaborative freeze-drying technology is adopted, microwave internal heating is achieved through a 2.45 GHz magnetron microwave generator and a rectangular waveguide tube under the conditions that the vacuum degree is 20-30 Pa and the plate layer temperature ranges from-40 DEG C to-35 DEG C, the microwave power density in the primary drying stage ranges from 0.3 W / g to 0.5 W / g, the microwave power density in the secondary drying stage ranges from 0.1 W / g to 0.3 W / g, and collaborative control over the microwave power, the vacuum degree, the temperature and the time is achieved in cooperation with a quaternary coupling precise control system. The preparation contains 50 mg of sinomenine hydrochloride, 100 mg of mannitol and 10 mg of sodium carboxymethyl cellulose grafted modified polyvinylpyrrolidone, the residual moisture is controlled to be 0.4-0.6%, the activity retention rate is 94-96%, and the drying time is shortened to 12-16 hours.

The invention belongs to the technical field of molecular diagnosis, and particularly discloses a high-risk HPV16 rapid detection system based on RPA-CRISPR / Cas12a, which is prepared by the following steps: (1) mixing a nucleic acid lysis solution containing Tris (pH = 8.0), NaHCO3, polyvinylpyrrolidone and Tween-20 with Proteinase K to treat a sample, and performing pyrolysis at room temperature for 5 minutes to obtain a nucleic acid template; (2) an RPA reaction system contains an RNA inhibitor, a reverse transcriptase and an RPA reaction essential enzyme, and after the template and the starting agent in the step (1) are added, RPA amplification is carried out at 37 DEG C; (3) dropping the reaction liquid on a colloidal gold test strip subjected to position exchange and transformation of a sample pad and a water absorption pad, and carrying out result interpretation; and (4) adding the RPA product into a CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) reaction system containing the LbCas12a protein, the specific gRNA and the probe. According to the scheme, a rapid, high-sensitivity and cross-reaction-free detection system of the HPV16 is realized by optimizing a nucleic acid lysis solution formula, designing a specific primer and gRNA and modifying a test strip for detection.

The invention relates to a cellulose-chitosan-based lithium ion battery diaphragm and a preparation method and application thereof.The preparation method of the diaphragm comprises the steps that gamma-polyglutamic acid and polyamide epichlorohydrin are adopted for modifying chitosan, the hydrophilicity and the liquid absorption capacity of the chitosan are improved, polyvinylpyrrolidone is adopted for coating the chitosan, and the hydrophilicity and the liquid absorption capacity of the chitosan are improved; pVP is replaced in ethanol soaking to form micropores, so that the porosity of the modified chitosan is improved. Amino groups and hydroxyl groups of the modified chitosan are combined with catechol of the polydopamine and hydroxyl groups of the hydroxy propyl cellulose through hydrogen bonds and covalent bonds to form a chitosan-cellulose-PDA interpenetrating network, and the diaphragm material suitable for the lithium ion battery is finally prepared by combining hot-pressing shaping. The preparation method has the advantages that the balance between the mechanical property and the ion conduction property of the diaphragm is realized through multi-component compounding by utilizing the biocompatibility and renewability of natural macromolecules (cellulose and chitosan).

The application discloses a preparation method of a hydrophilic oil-water separation anti-pollution membrane and the anti-pollution membrane and application thereof, and prepares MNRs material; the MNRs material is dispersed in dimethylacetamide, is uniformly stirred, polyvinylpyrrolidone is added, and stirring is continued, and a first mixture is obtained through ultrasonic treatment; the first mixture is mixed with polyvinylidene fluoride to obtain a second mixture, and the second mixture is stirred; the treated second mixture is dip-coated on a carrier, the dip-coated carrier is treated in deionized water to obtain an ultrafiltration membrane; the ultrafiltration membrane is soaked in a tea polyphenol solution with a Tris-HCl buffer solution, and is shaken to obtain the hydrophilic oil-water separation anti-pollution membrane. The hydrophilic oil-water separation anti-pollution membrane has excellent separation efficiency and flux recovery rate for four different oil-water mixtures of kerosene, gasoline, edible oil and n-hexane. The preparation process of the oil-water separation membrane is simple, the cost is low, and the reaction condition is mild; when the oil-water separation membrane is applied to organic wastewater separation, the oil-water separation membrane has the advantages of high efficiency, good removal performance and good recycling performance.

The invention belongs to the technical field of membrane separation, and particularly relates to a low-pressure high-flux polyamide / polysulfone hollow fiber composite nanofiltration membrane and a preparation method thereof. The preparation method of the composite nanofiltration membrane comprises the following steps: dissolving sulfonated polysulfone, poly (1-vinyl-3-butylimidazole) bromide and polyvinylpyrrolidone to prepare a spinning solution, and spinning to obtain a base membrane; carrying out hydrophilic modification on the base membrane by using 1, 3-propane sultone; then, an aqueous phase solution containing poly (gamma-glutamic acid) and triethylene tetramine and an organic phase solution containing trimesoyl chloride and 3, 5-diaminobenzoic acid are subjected to interfacial polymerization in the inner cavity of the modified base membrane to form a polyamide separation layer; and finally, carrying out heat treatment to obtain the composite nanofiltration membrane. Through the synergistic effect of zwitterionic ionization of the base membrane and biomacromolecule construction of the separation layer, the mass transfer resistance of water is remarkably reduced, unification of high flux and high selectivity is achieved, and good structural stability is achieved.

The invention discloses a preparation method of a CoMnFe-PBA hollow superstructure material, which combines seed induced self-assembly with an in-situ ligand / metal ion exchange growth method, and comprises the following steps: dissolving MOF-74 and potassium ferricyanide in deionized water, and carrying out ultrasonic treatment to form a solution A; dissolving polyvinylpyrrolidone, ferric chloride and manganese chloride tetrahydrate in a mixed solvent of ethanol and deionized water, and stirring for a certain time to obtain a solution B; dropwise adding the solution B into the solution A, stirring, carrying out centrifugal collection, ethanol washing and freeze drying on a reaction product, and collecting a sample to obtain the CoMnFe-PBA hollow superstructure material. According to the CoMnFe-PBA hollow superstructure material prepared through the method, a construction unit of a self-assembly superstructure is expanded to PBA nanoparticles, and the synthesis strategy, the construction unit, the structural level and the application range of the self-assembly superstructure can be further expanded.

The invention belongs to the field of nano-medicine and traditional Chinese medicine, and particularly discloses an antioxidant nano-material based on self-assembly of traditional Chinese medicine and copper ions and a preparation method thereof.The nano-material is prepared from BPCu nano-particles formed by self-assembly of berberine and procyanidine B2 under induction of the copper ions, the BPCu nano-particles are further subjected to surface modification through polyvinylpyrrolidone, and the antioxidant nano-material is prepared. And the stably dispersed PVP-coated BPCu nano structure is obtained. The material is small in particle size, uniform in distribution, good in water solubility and storage stability, excellent in free radical scavenging capacity and catalase-like activity and suitable for adjuvant therapy of oxidative stress related diseases, and the preparation method is easy and convenient to operate, does not need an organic solvent and has good industrialization and disease treatment potential.

The invention discloses a biological challenge device with combined adjustable resistance for evaluating the effect of a sterilization process, which comprises a shell, the shell comprises a plastic pipe and an inner pipe cap detachably connected with the inner wall of the plastic pipe, the inner pipe cap is provided with a breathable window and covered by a breathable film, and a bacterial contamination carrier for bearing indicator biological spores is attached to the inner bottom of the plastic pipe. An openable container containing a liquid culture medium is arranged in the plastic pipe cavity; the outer side of the inner pipe cap is sleeved with an outer pipe cap detachably connected with the outer wall of the plastic pipe, and the outer pipe cap is provided with a flow blocking structure used for adjusting the speed of the sterilizing agent entering the area of the inner pipe cap; the indicator biological spores are pretreated by a stable protective agent containing one or more of polyethylene glycol, trehalose, sorbitol, polyvinylpyrrolidone and glyceryl stearate. The speed of a sterilizing agent entering the device can be limited, the spores are dry in a suspension added with a stable protective agent, the capability of resisting general environmental changes is very good, and the performance of the device can be maintained for a long time.

The invention relates to the technical field of PVB (polyvinyl butyral) films, in particular to a full-wave-band heat-shielding modified PVB composite film as well as a preparation method and application thereof. The full-band heat shielding modified PVB composite film provided by the invention is of an asymmetric structure and comprises a modified PVB matrix and a heat shielding coating covering one side of the modified PVB matrix, the modified PVB matrix is prepared from the following components: polyvinyl butyral and an epoxy silane coupling agent; the heat shielding coating comprises the following components: CsWO3 nano powder, ZnO nano powder, water-based acrylic resin and a composite dispersion system; the composite dispersion system comprises triethylene glycol di-2-ethylhexoate, polyvinylpyrrolidone and diethylene glycol monobutyl ether. The full-wave-band heat shielding modified PVB composite film provided by the invention can realize 780-2500nm full-wave-band near-infrared high-efficiency barrier, improve the binding force and performance stability of a heat shielding coating, and meet the production requirements of light weight, environmental protection and industrialization at the same time.

The invention provides a method for grafting Tibetan white bark pine on Chinese pine, belongs to the technical field of needle-leaved tree species grafting, and solves the technical problem that the survival rate is lower than 40% due to slow joint healing, high pathogen infection rate and environmental fluctuation. According to the technical scheme, the method is characterized by comprising the following steps: cutting 1.8-2.2 cm of a vertical notch reaching xylem at the part, which is 2.5-3.5 cm exposed out of the surface of a culture medium, of a rootstock rhizome part; cutting the scion base into a symmetrical double-sided wedge shape, and immersing the scion base into a sodium citrate buffer solution containing polyvinylpyrrolidone, methyl salicylate and calcium chloride; the two sides of the vertical notch are coated with adsorption glue; inserting a scion alignment cambium and fixing by using a grafting belt; an ethanol water solution containing salicylic acid, trehalose and polysorbate 80 is applied to the interface every 2-3 days; maintaining the day temperature to be 23-25 DEG C, the night temperature to be 16-18 DEG C and the humidity to be 90-95%; when the young sprouts grow to 2-3 cm, the rootstocks are girdled, and trunks are cut off after 7-10 days. The method is used for large-scale breeding of the Tibetan pinus bungeana grafted seedlings.

The invention provides 3D tumor cell culture hydrogel as well as a preparation method and application thereof. The 3D tumor cell culture hydrogel is prepared from the following raw materials: polyvinylpyrrolidone and polyvinyl alcohol. The preparation method comprises the following steps: mixing a polyvinylpyrrolidone solution with a polyvinyl alcohol solution, adjusting the pH value, and freezing-unfreezing to obtain the 3D tumor cell culture hydrogel. The 3D tumor cell culture hydrogel provided by the invention does not need to be additionally added with a chemical cross-linking agent, and the material is high in biocompatibility and flexible in modulus adjustment, and can be well applied to a 3D in-vitro culture model of tumor cells.

The invention discloses an internal-acid and external-alkali type organic-inorganic hybrid molecular sieve catalyst as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalytic materials and chemical processes. According to the catalyst, a hydrogen type Beta molecular sieve is used as an acidic inner core, polyvinylpyrrolidone (PVP) is used as an organic shell, and a unique inner-acid outer-alkali structure is formed. The preparation method comprises the following steps: hydrothermally synthesizing a hydrogen type Beta molecular sieve with a specific silica-alumina ratio, and then coating PVP through surface adsorption. The catalyst is used for catalyzing the condensation of methylal and trioxymethylene under mild conditions (40-70 DEG C and normal pressure) to prepare polyoxymethylene dimethyl ethers (DMMn). The PVP shell covers acidic sites on the outer surface of the molecular sieve to form an external neutral / weak base and internal strong acid microenvironment, so that the secondary side reaction of the product is effectively inhibited, the trioxymethylene conversion rate of more than 98% and the DMMn selectivity of more than 96% can be obtained in the reaction at 50 DEG C and normal pressure, the product distribution can be regulated and controlled, and the traditional Anderson-Schulz-Flory distribution limitation is broken through. The catalyst disclosed by the invention has the advantages of high activity, high selectivity, mild conditions and easiness in separation, and has a good industrial application prospect.

The invention relates to an ultrasonic vibration assisted large-width copper plate strip continuous extrusion short-process technology, and belongs to the technical field of metal processing. A copper raw material is subjected to mechanical cleaning and then ultrasonic cleaning, and the surface cleanliness of the raw material is guaranteed; the cleaned copper raw materials are fed into continuous extrusion equipment, and ultrasonic vibration is adopted for assisting continuous extrusion; after the extruded copper plate strip is cooled, spraying a suspension containing cerium (IV)-sodium dodecyl benzene sulfonate-pyrrolidone nano aluminum oxide additive on the surface of the copper plate strip, and drying; straightening by using a multi-roll straightening machine to obtain a large-width copper plate strip; the cerium (IV)-sodium dodecyl benzene sulfonate-pyrrolidone nanometer aluminum oxide auxiliary agent is prepared from nanometer aluminum oxide, DMF (Dimethyl Formamide), sodium dodecyl benzene sulfonate, N-vinyl pyrrolidone, ammonium persulfate and cerous sulfate (IV); the copper plate strip prepared by the invention has relatively high density, relatively high tensile strength and ductility, and the mechanical property of the copper plate strip is remarkably improved.

The invention relates to the technical field of conductive agents, and particularly discloses graphene carbon nanotube composite conductive paste for a high-voltage electrode and a preparation method of the graphene carbon nanotube composite conductive paste. The graphene carbon nanotube composite conductive paste for the high-voltage electrode is prepared from the following raw materials in parts by weight: 2 to 6 parts of carboxylated single-walled carbon nanotube powder, 1 to 3 parts of fluorinated modified graphene powder, 0.6 to 1.2 parts of superfine carbon black, 2 to 4 parts of an ionic liquid dispersing agent, 0.2 to 0.4 part of a rheology modifier and 80 to 100 parts of N-methyl pyrrolidone. According to the graphene carbon nanotube composite conductive paste for the high-voltage electrode, the breakdown field strength can be remarkably improved, partial discharge is inhibited, and high conductivity is kept while the high-voltage service life is prolonged.

The invention relates to a preparation method of a terbium-doped gadolinium oxysulfide fluorescent material. The performance of the material is remarkably improved through an optimized high-temperature solid-phase method. According to the process, firstly, polyvinylpyrrolidone (PVP) and dopamine hydrochloride are used as a dispersing agent and a coating agent to prepare uniformly dispersed Gd2O3 and Tb4O7 oxide precursors, then through a fluxing agent system with the synergistic effect of boric acid and lithium carbonate and in combination with a low-temperature pre-sintering-medium-temperature vulcanization-high-temperature crystallization three-stage sintering process, grain aggregation and abnormal growth are effectively inhibited, and the Gd2O3 / Tb4O7 composite material is obtained. And finally, annealing in air to remove carbon impurities to obtain the superfine fluorescent powder with small particle size and narrow distribution. Experiments show that the particle size D50 of the fluorescent powder in the embodiment is 496-678 nm, the fluorescence decay life exceeds 1100 microseconds, the luminous intensity is high, the stability is excellent, and the fluorescent powder has wide application prospects in the fields of liquid crystal display, biomedicine and the like.

The invention relates to the technical field of pharmaceutical preparations, in particular to a solid dispersion-based sustained-release drug composite carrier as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out synergistic spray drying on double polymers (hydroxypropyl methylcellulose acetate succinate and polyvinylpyrrolidone-vinyl acetate copolymer) to form a solid dispersion; compounding with mesoporous silica and calcium silicate for localization, and spraying ethanol to activate pores; calcium stearate and magnesium stearate are sequentially added for lubrication; prefabricating a sustained-release skeleton master batch; and finally, mixing, rolling and forming. According to the method, through hierarchical structural design, the drug stability, the powder fluidity and the release controllability are remarkably improved, the method is suitable for industrial production of the dihydroergoline mesylate sustained release preparation, and a release curve is smooth and reliable.

The invention belongs to the technical field of new energy materials and bioelectrochemistry, and particularly relates to an iron-based multi-metal sulfide composite carbon anode material and a preparation method of the iron-based multi-metal sulfide composite carbon anode material. The preparation method is simple in process flow, convenient to operate, easy for large-scale production, wide in raw material source, low in cost and environment-friendly, and can be used for preparing the three-dimensional porous carbon matrix which is formed by foaming and carbonizing polyvinylpyrrolidone and is provided with interconnected carbon nanosheets. Through reasonable composition design and structural regulation, and optimization of metal ratio and vulcanization conditions, accurate regulation of material performance can be realized, electrochemical performance and biocompatibility are significantly improved, electricity generation performance and operation stability of a microbial fuel cell are improved, and good industrial application prospects are achieved.

The invention relates to the technical field of lubricating oil, and discloses a low-temperature-resistant lubricating oil composition and a preparation method thereof. Mineral oil, modified polymethacrylate, a dispersing agent, an antioxidant and an oil defoaming agent are stirred and mixed and then filtered, and the low-temperature-resistant lubricating oil composition is obtained. The cross-linking agent enables polymethacrylate to form a light cross-linked structure, and stress can be dispersed during shearing; nitrogen atoms in triazinyl, pyridyl, pyrrolidone and Mannich base structures serve as hydrogen bond receptors, the hydrogen bond interaction with hydroxyl on a polymethacrylate molecular chain is enhanced, a physical cross-linked network is formed, and the shear resistance is further improved; in the modified low-temperature-resistant monomer, the glass-transition temperature can be remarkably reduced by high flexibility of silicon oxygen bonds in long straight-chain alkyl and silane groups, so that a molecular chain can still move at a low temperature, and the low-temperature fluidity of the lubricating oil is improved; the cyclic structure of cyclohexyl can effectively interfere with the ordered arrangement of wax crystals, reduce the pour point of the lubricating oil and improve the low-temperature fluidity.

The invention belongs to the technical field of biological medicine, and particularly relates to eutectic gel, a preparation method thereof and application of the eutectic gel in promoting mucous membrane drug delivery. The invention provides eutectic gel. The eutectic gel comprises a eutectic solvent and a polymer solution, the eutectic solvent comprises a hydrogen bond acceptor and a hydrogen bond donor; the polymer solution is selected from one or more of a gelatin solution, a polyvinyl alcohol solution, a polyethylene solution or a pyrrolidone solution. The eutecticevaporate gel provided by the invention can realize rapid and tight adhesion and continuous administration on mucous membranes which continuously secrete mucus, and has the following advantages: tight adhesion can be formed on mucous membranes with dynamically updated mucus, so that the residence time of an administration system on the mucous membranes is prolonged; and a drug delivery channel is established by penetrating through a mucous layer, so that the drug is efficiently and continuously delivered to mucous membrane tissues. The deep eutectic gel effectively solves the problem that an existing mucous membrane drug delivery system is low in drug delivery efficiency.

The invention belongs to the technical field of self-repairing materials, and particularly relates to a double-microcapsule self-repairing waterborne polyurethane material and a preparation method thereof. Comprising the following steps: ultrasonically dispersing cellulose nanocrystals in deionized water to form a water phase, adding drying oil and lauryl sodium sulfate, and stirring to obtain the drying oil microcapsule taking Pickering emulsion as a template. Preparing a polyvinylpyrrolidone aqueous solution, a non-polar solvent solution of thiophene monomers and an ammonium persulfate aqueous solution; and mixing and ultrasonically dispersing the two, mixing with an ammonium persulfate aqueous solution, stirring and polymerizing to obtain a polythiophene microcapsule suspension after the reaction is completed, centrifuging until the supernatant is colorless, and washing and drying the solid to obtain the polythiophene microcapsule. And finally, adding the two microcapsules into waterborne polyurethane, uniformly mixing, and drying at room temperature to form the double-microcapsule self-repairing waterborne polyurethane material. According to the invention, the self-repairing and mechanical property improvement of the double-microcapsule self-repairing waterborne polyurethane material under room-temperature natural light are realized.

The invention relates to the field of drug-resistant bacterium infection, and discloses a g-C3N4 / Bi2Se3 nano heterojunction and a preparation method thereof.The preparation method comprises the steps that firstly, melamine powder is heated and calcined at the constant temperature, after a tubular furnace is naturally cooled, spark plasma sintering is conducted, nitrogen vacancies are introduced at the same time, and a blocky high-defect g-C3N4 material is obtained; grinding into powder, adding deionized water for ultrasonic treatment to obtain a first suspension, performing centrifugal treatment, freeze-drying the supernatant, and adding into an ethylene glycol solvent to obtain a second suspension; eG, polyvinylpyrrolidone, Bi (NO3) 3.5 H2O and Na2SeO3 are mixed and stirred, and the second turbid liquid is added; the preparation method comprises the following steps: adding Bi2Se3 into a reaction kettle, heating while stirring, adding a hydroxylamine EG solution, cooling to room temperature after reaction, centrifuging, washing, and carrying out vacuum drying on a precipitate to obtain a g-C3N4 / Bi2Se3 nano heterojunction; the problems that in the prior art, the catalytic efficiency is low, a collaborative mechanism does not achieve structure-function integrated design, the performance of a key functional material is limited, and the structural stability and biological suitability of the material are insufficient are solved.

The invention relates to the technical field of protective films, and discloses a mobile phone protective film and a preparation method thereof. Modified graphene oxide is used as a filler, a modified waterborne polyurethane emulsion is used as a film forming substance, a flatting agent and a defoaming agent are used as auxiliary materials, a waterborne polyurethane coating is prepared, the surface of a PET base material is coated with the waterborne polyurethane coating, then drying is conducted, and the mobile phone protection film is obtained. A quaternary ammonium salt group and negative charges on a bacterial cell membrane generate electrostatic attraction, so that the original structure and function of the cell membrane are destroyed, and a bactericidal effect is achieved; silanol groups generated by hydrolysis of silane groups can react with hydroxyl groups and carboxyl groups on the surface of a PET base material, so that the interface bonding force between the coating and the base material is improved; nitrogen atoms in pyrrolidone groups form hydrogen bonds with hydroxyl groups and carboxyl groups on the surface of a base material, so that the bonding strength of the coating and the base material is further improved; the adamantyl group is grafted into the graphene oxide, so that the supporting effect of the graphene oxide on the waterborne polyurethane is enhanced, and the mechanical property of the mobile phone protective film is improved.

The invention discloses stem cell freeze-dried powder for promoting skin healing and a preparation method of the stem cell freeze-dried powder. The freeze-dried powder comprises an effective component, a freeze-drying protective agent group and a polymer protective agent group, the effective component is umbilical cord mesenchymal stem cell conditioned medium freeze-dried supernatant, the protective agent group is selected from one or more of cane sugar, trehalose, lactose and mannitol, and the polymer protective agent group is selected from one or more of polyvinylpyrrolidone (PVP) and glucan. The preparation method comprises the following steps: collection of a conditioned culture medium, preparation of a freeze-drying protective agent solution, mixing treatment, low-temperature pre-freezing and freeze-drying, collection and packaging of freeze-dried powder and the like. The method can effectively retain stem cell-derived active factors and enhance the stability and redissolvability of the freeze-dried powder, and is suitable for skin wound repair, regenerative medicine and other scenes.