172 results about "Silicon dioxide nanoparticles" patented technology

The invention relates to the technical field of material science and engineering, and discloses a nanocellulose-based oil-water separation and adsorption composite material, which is prepared from the following raw materials in parts by mass: 35 to 45 parts of nanocellulose; 8 to 11 parts of bagasse cellulose; 10 to 15 parts of sodium lignin sulfonate; 4 to 8 parts of chitosan; 5-10 parts of oxidized starch; 5 to 8 parts of cellulose nanowhiskers; 2-5 parts of silicon dioxide nanoparticles; 0.5 to 1 part of calcium carbonate nanoparticles; 1-2 parts of a citric acid cross-linking agent; 1-2 parts of graphene oxide; 0.3 to 0.6 part of ethylene diamine tetraacetic acid; 2-5 parts of glycerol; 0.4 to 1 part of stearoyl chloride; 2-4 parts of nano iron oxide; the preparation method comprises the following steps: pretreating the raw materials, mixing the pretreated raw materials into slurry, carrying out crosslinking and ultrasonic dispersion, standing to obtain a basic mixture, injecting the basic mixture into a mold, carrying out freeze drying to form a photocatalytic layer, carrying out centrifugal dewatering, carrying out chelation reaction, spraying a composite solution, and carrying out vacuum drying to obtain the photocatalytic material. The obtained composite material has the advantages of efficient adsorption capacity, good mechanical properties, environmental friendliness, degradability and low preparation cost.

The invention discloses a preparation method of a solvent-resistant nanofiltration membrane with a polydopamine / amino silicon dioxide middle layer, belongs to the technical field of membrane separation, and solves the technical problems of low flux and poor stability of the solvent-resistant nanofiltration membrane. The preparation method of the solvent-resistant nanofiltration membrane with the polydopamine / amino silicon dioxide middle layer comprises the following steps: preparing a polyetherimide-based membrane by a phase inversion method-crosslinking method; preparing amino silicon dioxide nanoparticles by adopting a sol-gel method; preparing a deposition solution containing dopamine, an oxidizing agent and amino silicon dioxide by using a Tris buffer solution; depositing the polydopamine / amino silicon dioxide intermediate layer on the upper surface of the polyetherimide base film; carrying out interfacial polymerization reaction of piperazine and trimesoyl chloride on the surface of the membrane deposited with the middle layer, and carrying out heat treatment to obtain a composite membrane; and immersing the composite membrane into an organic solvent for activation to obtain the solvent-resistant nanofiltration membrane with a polydopamine / amino silicon dioxide intermediate layer. The solvent-resistant nanofiltration membrane constructed by taking polyetherimide as a base membrane, polydopamine / amino silicon dioxide as a middle layer and polyamide as a separation layer has excellent flux and stability, and has a wide application prospect in the aspects of drug separation, organic solvent recovery and the like.

The invention relates to the field of material science and mechanical engineering, in particular to a high-strength aluminum-magnesium-silicon material bolt for a new energy automobile and a preparation method of the high-strength aluminum-magnesium-silicon material bolt. The bolt is made of an aluminum-magnesium-silicon alloy, and the alloy contains magnesium, silicon, manganese, iron, chromium, titanium, scandium, rare earth elements and the balance of aluminum. By optimizing the proportion of rare earth elements (yttrium, lanthanum and cerium) and scandium, grains are effectively refined, the tensile strength, the yield strength and the ductility are improved, and meanwhile the corrosion resistance and the fatigue resistance are enhanced. The preparation method comprises the steps that vacuum melting is combined with the ultrasonic-assisted technology, alloy elements are evenly distributed, and then the material structure is optimized through solution treatment at the temperature of 540 DEG C for 1.5 h and aging treatment at the temperature of 160 DEG C for 8 h. And the surface of the bolt is subjected to anodic oxidation and coated with a composite coating containing silicon dioxide nanoparticles, so that the wear resistance and the corrosion resistance are improved. Through verification, the bolt has the excellent performance that the tensile strength is larger than or equal to 490 MPa, the yield strength is larger than or equal to 440 MPa, the ductility is larger than or equal to 8.5%, and the salt spray test time is larger than or equal to 1500 hours, and the fastening requirement of the new energy automobile under the complex working condition is met.

The invention relates to the technical field of fire extinguishing microcapsules, in particular to a high-airtightness perfluorohexanone fire extinguishing microcapsule and a preparation method and application thereof.The perfluorohexanone fire extinguishing microcapsule comprises a composite shell layer and a fire extinguishing core, and the composite shell layer is made of ethylene-vinyl alcohol copolymer resin and silicon dioxide nanoparticles; the fire extinguishing core is a perfluorohexanone fire extinguishing agent and is applied to preparation of indoor fire extinguishing pastes, fireproof coatings and polyurethane adhesive materials. According to the perfluorohexanone fire extinguishing microcapsule disclosed by the invention, the diffusion of low-polarity perfluorohexanone is effectively prevented by utilizing the strong hydrogen-bond interaction between hydroxyl groups in the ethylene-vinyl alcohol copolymer resin, and especially under the condition of relatively high temperature, the perfluorohexanone fire extinguishing microcapsule has a good fire extinguishing effect. The problem that an existing perfluorohexanone fire extinguishing microcapsule is poor in long-term air tightness under the condition of high encapsulation efficiency is effectively solved, and meanwhile harmful substances such as formaldehyde cannot be generated.

The invention relates to the field of filtering materials, in particular to a filtering material for removing silicon and aluminum from ionic membrane caustic soda brine and a preparation method of the filtering material. The filtering material for removing silicon and aluminum from ionic membrane caustic soda brine comprises a hierarchical porous structure carbon adsorption material, the hierarchical porous structure carbon adsorption material comprises a plurality of large holes with the diameter of 800-1000 nm and a plurality of small holes with the diameter of 50-100 nm, and each small hole is located in the hole wall of the corresponding large hole. According to the invention, polymethyl methacrylate microspheres are used as macroporous templates, silicon dioxide nanoparticles are used as microporous templates, and gaps of the templates are filled with a carbon precursor through impregnation. A three-dimensional communicated macropore and micropore hierarchical structure is constructed by a double-template method, macropores are used as channels for rapid diffusion of silica-alumina colloid, and micropores are distributed on the wall surfaces of the macropores to provide a high specific surface area, so that the density of active sites is remarkably increased; the physical screening effect can selectively intercept target impurities, meanwhile, competitive ions such as calcium and magnesium ions are prevented from entering pore channels, and the dynamic adsorption capacity is remarkably improved compared with traditional activated carbon.

The invention discloses a high-yield gastrodia elata planting method based on Tilia brachypoda fungus material optimization and seed ramie stress resistance activation. According to the high-yield gastrodia elata planting method based on Tilia brachypoda fungus material optimization and seed ramie stress resistance activation, yield increase and quality improvement are achieved through fungus material composite strengthening treatment and a composite strain synergistic inoculation technology. The method comprises the following steps: (1) fermenting a tilia brachypoda substrate by lactobacillus plantarum and soaking in a nano-composite nutrient solution to form a high-activity bacterial material; (2) nitrogen-fixing bacteria, disease-resistant actinomycetes and armillaria mellea are mixed and inoculated according to the proportion of 3: 1: 1, nitrogen supply is improved, and the occurrence rate of black rot is reduced; 3) activating a GASA stress-resistant gene of the seed hemp through a pulsed electric field (5 kV / cm, 10 microseconds), and enabling the germination rate to reach 88.5% in combination with a calcium signal channel strengthening technology; according to the method, the yield per mu of gastrodia elata is increased by 30%-40%, the gastrodin content is increased by 30% or above, the chemical pesticide dosage is reduced by 55%, the strain passage purity is stable, the method is suitable for large-scale planting in multiple climate areas, and an innovative solution is provided for green production of traditional Chinese medicinal materials.

The invention relates to a motor outgoing line technology, and discloses a special material for a motor outgoing line. The polyimide composite material is prepared from the following components in percentage by weight: 50 to 70 percent of polyimide matrix material, 5 to 12 percent of nano-scale low-dielectric-constant filler, 10 to 20 percent of micron-scale reinforcing filler, 3 to 8 percent of conductive filler, 0.5 to 2 percent of interface regulating agent and 1 to 3 percent of processing aid. The invention also provides a preparation method of the special material for the motor outgoing line. The preparation method comprises the following steps: S1, carrying out surface modification on a nanoscale low-dielectric-constant filler and an interface regulating agent through solvent dispersion; by adopting the technical scheme of compounding the surface modified silicon dioxide nanoparticles and the polyimide matrix, the technical effects of reducing the dielectric constant and reducing the leakage current are achieved. By modifying the filler, the dispersity and interface bonding property of particles are improved, and the defects of high dielectric constant and large leakage current caused by interface polarization and uneven distribution of the filler in the prior art are overcome.

The invention relates to the technical field of rubber paint, in particular to rubber paint with good wear resistance and a preparation method thereof. The rubber paint is prepared from the following raw materials in parts by weight: 60-80 parts of chlorinated rubber, 30-50 parts of solvent, 20-40 parts of alkyd resin, 10-20 parts of polytetrafluoroethylene resin, 6-10 parts of epoxy resin, 6-10 parts of filler, 4-6 parts of additive, 2-4 parts of flatting agent, 1-3 parts of ultraviolet light absorber, 1-3 parts of dispersing agent and 1-3 parts of defoaming agent. According to the rubber paint, fluorosilane has the characteristic of low surface energy, a molecular layer with low surface energy can be formed on the surface of the rubber paint, the friction force borne by the surface of the rubber paint is small due to the low surface energy, the wear resistance of the rubber paint is improved, tetraethyl orthosilicate and ammonia water are matched to generate a hydrolytic condensation reaction, and silicon dioxide nanoparticles are generated; inorganic rigid components in the rubber paint are further increased, so that the overall hardness and wear resistance of the rubber paint are enhanced.

The invention discloses a waterborne polyurethane coating with corrosion-resistant and antifouling characteristics as well as a preparation method and application thereof, and the waterborne polyurethane coating is prepared from the following raw materials in parts by weight: 30 parts of diisocyanate, 15-30 parts of polycarbonate diol, 0.01-0.02 part of a catalyst, 3-5 parts of polydimethylsiloxane, 3-5 parts of a hydrophilic chain extender and 1-3 parts of a micromolecule chain extender. The preparation method comprises the following steps: preparing the following components in parts by weight: 0.5-3 parts of modified silicon dioxide nanoparticles, 1-3 parts of triethylamine, 4-10 parts of acetone and 130-150 parts of water; the modified silicon dioxide nano particles are nano silicon dioxide modified by a silane coupling agent and dodecyl triethoxy silane. The waterborne polyurethane coating can effectively prevent corrosion of seawater to metal equipment and adhesion of marine organisms to the surface of underwater metal equipment, and has important significance in expanding the application of the waterborne polyurethane coating in the field of marine protection.

The invention discloses low-irritation cyhalothrin and a preparation method and application thereof, and belongs to the technical field of pesticide preparations, the low-irritation cyhalothrin comprises silicon dioxide nanoparticles with the surfaces grafted with amphiphilic copolymers, cyhalothrin and an anti-allergic drug, the silicon dioxide nanoparticles with the surfaces grafted with the amphiphilic copolymers are dispersed in a solvent, and the anti-allergic drug is added to the silicon dioxide nanoparticles with the surfaces grafted with the amphiphilic copolymers to prepare the low-irritation cyhalothrin. The preparation method comprises the following steps: taking porous silicon dioxide nanoparticles as a carrier, modifying a layer of amphiphilic polymer on the surface of silicon dioxide in situ, then adding cyhalothrin and an anti-allergic drug, continuously stirring, and drying the obtained product to obtain the low-irritation cyhalothrin. The cyhalothrin and the anti-allergic drug are loaded in silicon dioxide pore channels, and the anti-allergic agent is used in cooperation, so that the skin irritation of the cyhalothrin is reduced. The cyhalothrin with low irritation provided by the invention is simple in preparation method, can be used as a cyhalothrin insecticide raw medicine, and has relatively great market application potential.

The invention discloses a soft coal seam nanofluid fracturing propping material and a preparation method thereof.The soft coal seam nanofluid fracturing propping material is prepared from, by weight, 80-90% of a base material, 1-5% of a super-hydrophobic coating, 5-10% of a catalytic active component and 5-15% of a rheological enhancer, the base material is a compound of high-purity silicon dioxide nanoparticles and graphene nanosheets GNP, the particle size of the high-purity silicon dioxide nanoparticles is 50-200 nm, the super-hydrophobic coating is a fluorosilane modified layer, the thickness of the super-hydrophobic coating is 5-20 nm, and the invention relates to the technical field of coal bed gas exploitation. According to the soft coal seam nanofluid fracturing propping material and the preparation method thereof, the surface of the material is provided with a super-hydrophobic coating, friction force with a coal matrix is reduced, high embedding resistance is achieved, the flow conductivity is specifically enhanced, an extra flow channel is provided through a porous nanostructure, the fracturing fluid permeability is improved, and meanwhile gas desorption can be cooperated; catalytic active sites are introduced to the surface of the material to promote adsorption and diffusion of methane molecules.

The invention discloses a transfer coating for improving the scratch resistance of tobacco transfer paper and a preparation method of the transfer coating, and particularly relates to the field of tobacco packaging. The coating is composed of polyurethane (PU) resin, acrylate resin and epoxy resin, and self-repairing microcapsules are added into the coating. A shell material of the self-repairing microcapsule is a polylactic acid-polyglycolic acid copolymer, and the self-repairing microcapsule is filled with silicon dioxide nanoparticles, polydimethylsiloxane, epoxy resin and an antioxidant vitamin E; the microcapsule is prepared through a double-emulsion method, chitosan is used as a stabilizer, polyethylene glycol is used as an emulsifier, and carbon nanotubes are used as a reinforcing agent; when the coating is damaged, the microcapsules are broken to release the repairing agent, so that the cracks are automatically repaired; the coating also contains a nano material and a functional filler, so that the wear resistance and mechanical strength of the coating are remarkably improved; through the improvement, the transfer coating disclosed by the invention prolongs the service life of the tobacco transfer paper and provides more excellent scratch resistance.

The invention relates to a wear-resistant high-strength high-toughness plastic plate and a preparation process thereof, and belongs to the technical field of plastic plate preparation. The formula of the plastic plate comprises polyamide resin, polycarbonate, modified glass fibers, chopped carbon fibers, polytetrafluoroethylene powder, silicon dioxide nanoparticles, a silane coupling agent KH-550, an organic nucleating agent and a lubricant. The modified glass fiber is prepared by treating sodium silicate and polyborosiloxane, and has excellent performance. The preparation process comprises the steps of raw material pretreatment, premix preparation, low-speed fiber mixing, twin-screw extrusion granulation, screw type injection molding and the like. In the preparation process, high strength, high toughness and wear resistance of the plastic plate are ensured by controlling the ratio of the raw materials and processing technological parameters, such as temperature, rotating speed, pressure and the like.

The invention relates to the field of biomimetic materials, in particular to a biomimetic self-cleaning anti-fouling aquaculture net cage material, a preparation method and application of the biomimetic self-cleaning anti-fouling aquaculture net cage material. 0.5 to 2.0 parts by weight of a carboxylated graphene nanosheet; 2.0 to 5.0 parts by weight of nitrogen-doped titanium dioxide nanoparticles; 1.0 to 3.0 parts by weight of silica nanoparticles; 5.0 to 10.0 parts by weight of calcium ion cross-linked modified sodium alginate; 1.0 to 3.0 parts by weight of octadecyl trichlorosilane; 0.5 to 1.5 parts by weight of lauryl sodium sulfate; through the synergistic effect of a double bionic structure and enhanced photocatalysis, the effective inhibition on attachment of various organisms is realized, and the inhibition rate on attachment organisms such as algae, bacteria and barnacles reaches 75% or above.

The invention discloses a sheet deicing structure, a composite ice dredging coating and a preparation method thereof, and belongs to the technical field of wind power generation. The preparation method of the composite ice-dredging coating comprises the following steps: dispersing silicon dioxide nanoparticles in an organic solvent to form a nanoparticle dispersion liquid with the concentration of 1-10wt%; and then, adding low-surface-energy resin and a curing agent into the nano-particle dispersion liquid, and treating under the ultrasonic action and the ice-water bath condition to obtain the composite ice-dredging coating. In addition, the invention also provides the composite ice-dredging coating prepared by the preparation method. In addition, the invention further provides a blade deicing structure which sequentially comprises a surface anti-icing layer, a heating layer, a heat conduction layer and a structural layer from top to bottom. The surface anti-icing layer is made of the composite ice dredging coating. The composite ice dredging coating provided by the invention realizes effective ice prevention and removal of the blade.

The invention relates to the technical field of films, in particular to a preparation method and application of a waterproof and oil-proof ventilation valve for food packaging. The preparation method comprises the following steps: carrying out plasma activation treatment on the porous polytetrafluoroethylene-based membrane; preparing fluoroalkyl silane modified silicon dioxide nano particles; preparing fluorine-containing organic silicon-silicon dioxide sol containing vinyl; a cross-linking layer is constructed through vacuum impregnation; preparing a hydrophilic / hydrophobic comonomer solution; copolymerized chain grafting is initiated by ultraviolet light; and water-based fluorocarbon emulsion is sprayed on the surface for curing. The obtained breather valve has super-hydrophobic and oleophobic characteristics, keeps high air permeability and high water vapor permeability at the same time, has the air permeability retention rate exceeding 95% after 10 times of moist heat sterilization, and is suitable for balancing internal and external pressure and blocking water and oil phase liquid permeation in the high-temperature and high-pressure sterilization process of a food packaging container.

The invention relates to a catalyst for ring-opening polymerization of ethylene oxide and a preparation method thereof, and belongs to the technical field of polymer material synthesis. The catalyst is a composite structure based on silicon dioxide nanoparticles loaded with bimetallic organic complexes. The invention adopts a special method to prepare a modified nitrogen-containing multidentate ligand, and coordinates with metal ions through covalent bonds to load the ligand on silicon dioxide nanoparticles. The high dispersibility and stability of silicon dioxide nanoparticles and the synergistic catalytic effect of bimetallic organic complexes are utilized to effectively improve the catalytic effect, accelerate the polymerization process, enhance the polymerization stability, increase the polymerization molecular weight, and narrow the distribution.

The invention discloses a medium-matte polyester film which is composed of a base material layer A, a surface matte layer B and a matte coating C sprayed on the outer side of the surface matte layer B. The base material layer A is composed of polyethylene glycol terephthalate and silicon dioxide nanoparticles. The surface matte layer B is composed of polyethylene glycol terephthalate, polytetrafluoroethylene and polyethylene glycol nanoparticles; the matte coating C is prepared from polyurethane acrylate, organic silicon silicon dioxide particles, triethylene glycol tripropoxy acrylate, benzophenone, polyether siloxane and polydimethylsiloxane. According to the medium-matt-degree polyester film, by optimizing the proportion of components such as PET, SiO2, PTFE and PEG, the good mechanical strength, wear resistance and matt effect are balanced, and the medium-matt-degree polyester film has excellent light transmittance and ultraviolet resistance. The film not only has low glossiness and high haze, but also shows excellent chemical resistance, scratch resistance and long-term stability, and is suitable for high-end applications such as polaroid release films and optical devices.

The invention discloses an electronic skin capable of realizing non-inductive, continuous and sensitive motion monitoring, and belongs to the field of flexible electronics and biomedical engineering. The electronic skin is mainly prepared from sodium alginate and acrylamide to form porous network gel, and the porous network gel is cross-linked to prepare the original porous base electronic skin; preparing solid-like coating paint from silicon dioxide nanoparticles, silicone oil and epoxy resin; the solid-like coating paint is uniformly sprayed on the surface of the original porous-based electronic skin through a spraying technology, and is cured to form the solid-like coating modified electronic skin. The electronic skin with the specific formula and thickness is prepared, and personalized, low-cost, portable, wireless, non-inductive, continuous and sensitive motion monitoring can be achieved.

The invention relates to a preparation method of a graphene-like carbon nitride / titanium dioxide hollow sphere composite material with a sandwich structure, which comprises the following steps: taking anatase titanium dioxide coated silicon dioxide nanoparticles, ultrasonically dispersing into a sodium hydroxide solution, and reacting at 60 DEG C for 3 hours to obtain a crude product; centrifugally separating, washing and drying to obtain titanium dioxide hollow spheres; the preparation method comprises the following steps: adding melamine, titanium dioxide hollow spheres and bicarbonate into deionized water, stirring for 1 hour at the speed of 300r / min under an ultrasonic-assisted condition, carrying out rotary evaporation to remove moisture, grinding, carrying out calcination reaction for 3 hours at the temperature of 500-550 DEG C in a muffle furnace, cooling, grinding into powder, washing and drying to obtain a product. The preparation method of the graphene-like carbon nitride / titanium dioxide hollow sphere composite material with the sandwich structure, provided by the invention, has the characteristics of simplicity and convenience in operation, high catalytic activity, widening of the visible light response range, improvement of the specific surface area and good recyclability.

The present application relates to the technical field of anti-adhesion packaging material research and development, and discloses an anti-adhesion liquid packaging film and a preparation process, which comprises the following steps: synthesizing octahexyl double-layer cyclic siloxane monomer, preparing an organic-inorganic hybrid type connecting agent through addition reaction of Si-H bonds of the octahexyl double-layer cyclic siloxane monomer and olefinic functional groups of an allyl silane coupling agent, modifying and treating hydroxylated silicon dioxide nanoparticles through the organic-inorganic hybrid type connecting agent, and then dispersing the hydroxylated silicon dioxide nanoparticles in a PE-SILICON-PE block copolymer matrix to prepare an anti-adhesion composite material; a film structure of a nine-layer co-extrusion film is arranged, the anti-adhesion composite material is introduced into the first layer and the ninth layer of the nine-layer co-extrusion film, and a nine-layer co-extrusion blown film process is used to prepare a packaging film with excellent anti-adhesion performance, which can be applied in the field of non-Newtonian liquid product packaging.

The invention provides coal gangue mortar. The coal gangue mortar is prepared from a gel material, aggregate, an additive, silicon dioxide microspheres and water, the admixture is powder, the mass of the admixture accounts for 0.12-0.20% of the sum of the mass of the gel material and the mass of the aggregate, the mass of the silicon dioxide nano-microspheres accounts for 0.05-0.25% of the sum of the mass of the gel material and the mass of the aggregate, and the silicon dioxide nano-microspheres are prepared by the following preparation method: dispersing prepared silicon dioxide gel in water at 90-100 DEG C, and stirring uniformly; the heat preservation energy efficiency of the vacuum heat preservation device is grade I or grade II, and the heat preservation effect of the heat preservation energy efficiency is gradually reduced from the grade I to the grade II; and filtering, washing, drying in vacuum, and sintering to obtain the silicon dioxide nano-microsphere. According to the coal gangue mortar provided by the invention, the particle size uniformity of the coal gangue mortar is improved by optimizing the preparation process of the silicon dioxide nanoparticles, so that the mechanical property of the modified coal gangue mortar is improved. The invention also provides a preparation method of the coal gangue mortar.

The invention discloses a nano composite ionic gel material with impact resistance and a preparation method thereof, and belongs to the field of polymer composite materials. The preparation method comprises the following steps: mixing and heating 5-methyl-2-isopropyl phenol and tetrabutylammonium tetrafluoroborate to prepare a solvent, adding isobornyl acrylate, hexafluorobutyl acrylate, KH570 modified silicon dioxide nanoparticles, 2, 6-diphenyl phenoxyethyl acrylate, a photoinitiator and a cross-linking agent into the solvent, and uniformly stirring to obtain the photocuring coating. And carrying out photopolymerization to obtain the nano composite ionic gel material. The nano-composite ionic gel material with impact resistance prepared by the invention is soft in a normal state and low in modulus; and when high-speed impact occurs, rapid and efficient energy dissipation occurs in the interior, the modulus is sharply increased, and the intelligent protection effect of'being rigid when encountering rigid and being flexible when encountering flexible 'can be achieved.

The invention discloses a radiation refrigeration material, a preparation method and a preparation device, and the radiation refrigeration material comprises a primer layer, a middle paint layer and a finish paint layer, the primer layer is doped with titanium dioxide nano particles; the middle paint layer is doped with aluminum oxide or barium sulfate nanoparticles; and the finish paint layer is doped with silicon dioxide nanoparticles and a fluorescent material. The preparation method of the radiation refrigeration material comprises the following steps: S1, respectively preparing the primer, the intermediate paint and the finish paint through weighing, stirring, grinding and filtering processes; s2, the surface of an object is coated with primer, and a primer layer is formed; s3, the surface of the primer layer is coated with intermediate paint, and an intermediate paint layer is formed; and S4, the surface of the middle paint layer is coated with finish paint to form a finish paint layer. The radiation refrigeration material preparation device comprises a stirring barrel, a stirring shaft and a feeding pipe. According to the scheme, the spectral selectivity, durability, environmental friendliness and attractiveness of the refrigeration material can be effectively guaranteed.

The application discloses a kind of low temperature extremely cold environment under optical fiber coating detection equipment and method, belong to coating detection technical field, comprising: obtaining temperature cycle times, coating thickness, heating gradient and other detection condition data, and coating adhesion, shrinkage, cracking length and other performance data;Construct detection condition evaluation model output detection condition coefficient;Based on detection condition, coating performance analysis model is established to output performance evaluation coefficient;Combined with the content of silicon dioxide nanoparticles and polyether polyurethane data, material analysis model is output material analysis coefficient;If the coefficient exceeds the preset threshold, then determine that the coating is unqualified and generate target formulation parameters.The application solves the technical problems of coating performance quantification evaluation and formulation precise optimization under extreme environment, significantly improves detection efficiency and reliability.

The invention provides a nicotine buccal product capable of rapidly inhibiting odor and moistening throat and clearing heat from throat and a preparation method thereof. The nicotine buccal product comprises a core layer, and a throat protecting layer, an odor inhibiting layer and a sweet aftertaste layer which are sequentially coated from inside to outside, the components of the core layer comprise nicotine salt and silicon dioxide nanoparticles; the throat protection layer is prepared from the following components: polylactic acid-glycolic acid copolymer microspheres loaded with nicotine salt, a cyclodextrin inclusion compound of dipotassium glycyrrhizinate and hyaluronic acid; the odor-inhibiting layer comprises the following components: nicotine salt, a cyclodextrin microcapsule loaded with a freshener and zinc zeolite particles loaded with plant essential oil; the sweet aftertaste layer comprises nicotine salt, a hydrophilic polymer material, a sweetening agent and an acidulant. The four-layer structure synergistically controls the nicotine release rate within a reasonable range, the palatability of the nicotine preparation is effectively improved through the multi-layer compound flavoring agent and the plant essential oil, and the nicotine preparation has the effects of freshening breath and clearing throat and is suitable for people with sensitive oral cavity and social scenes.

The invention discloses a high-speed copper-clad plate material based on an epoxy resin system and a preparation method thereof, and belongs to the technical field of energy conservation and environmental protection. In order to solve the problems that a traditional copper-clad plate is high in dielectric loss, poor in heat conductivity and insufficient in heat resistance, fluorinated silicon dioxide nanoparticles (the surface energy is smaller than or equal to 18 mN / m) are prepared through a sol-gel method, and a boron nitride layer is modified through trisodium citrate and aminopropyltriethoxysilane; mixing with bisphenol A epoxy resin, a reactive diluent, a DOPO flame retardant, dicyandiamide and 2-methylimidazole to obtain a resin adhesive; adding nano filler and deionized water, mixing and defoaming at a high speed, presoaking 2116 glass fiber cloth to prepare a prepreg, laminating, matching with copper foil, performing segmented hot pressing, and performing secondary tempering. Dk of the obtained material is 3.1-3.35, Df is smaller than or equal to 0.0055, Tg is larger than or equal to 165 DEG C, heat conductivity is larger than or equal to 0.59 W / m.K, peel strength is larger than or equal to 1.78 N / mm, T288 is larger than or equal to 40 min, and the material is suitable for 5G high-speed PCBs and has low energy consumption and environmental friendliness.

The invention relates to a high-strength MBR (Membrane Biological Reactor) ultrafiltration membrane, a preparation system and method thereof and a spinning solution. According to the invention, a composite nano reinforcing agent composed of modified silicon dioxide and graphene oxide is innovatively introduced into a membrane solution. The two nano materials form a rigid-flexible synergistic enhanced network in a polymer matrix; the graphene oxide is used as a two-dimensional nanosheet layer, so that stress is effectively transmitted and dispersed; and the silicon dioxide nanoparticles are used as stress concentration points to prevent the propagation of microcracks. Meanwhile, the invention provides a set of composite reinforcement solution. The core of the scheme is that a polyester / polyamide high-density composite braided tube subjected to plasma surface treatment is adopted as a mechanical skeleton of the membrane, and main operation stress is borne from the macroscopic scale. The multi-stage synergistic enhancement mechanism from the macroscopic braided tube to the nanoscale endows the membrane filament with mechanical strength far beyond the conventional level and fatigue and filament breaking resistance.

The utility model relates to the technical field of PC plates, in particular to a PC sunlight plate with an anti-dazzle function. According to the technical scheme, the utility model relates to the PC sunlight plate with the anti-dazzle function, and belongs to the technical field of PC plates. According to the technical scheme, the device comprises a hollow honeycomb layer, a gradient refractive index composite layer and a microprism array. The honeycomb axis of the hollow honeycomb layer and the substrate form an inclination angle of 15 degrees, and the inner wall is coated with the titanium dioxide scattering layer, so that light rays can be effectively scattered, glare is reduced, and heat is insulated. The gradient refractive index composite layer is composed of an outer PC base material plate containing a benzotriazole UV absorbent, a middle PC base material plate doped with silicon dioxide nanoparticles in a gradient mode and an inner antistatic modified PC base material plate, and the gradient refractive index composite layer has the anti-ultraviolet function and the anti-static function. And microprism arrays with the height of 0.2 mm and the spacing of 0.5 mm are uniformly distributed on the PC board, so that the anti-dazzle effect is further optimized. According to the utility model, through cooperative operation of all the structures, excellent anti-dazzle, heat insulation, ultraviolet resistance, stable structure and other characteristics are realized.

The invention discloses a discharge aiding agent for oilfield fracturing, and relates to the technical field of oilfield exploitation, the discharge aiding agent comprises 10-500 parts of mahogany petroleum sulfonate, 20-450 parts of alkylbenzene sulfonate, 10-590 parts of fatty alcohol, 1-50 parts of ethylene oxide, 1-90 parts of silica nanoparticles, 2-79 parts of alkyl halide, 20-90 parts of sodium hydroxide, 1-80 parts of sodium carbonate, 5-50 parts of xanthan gum, 1-78 parts of carbon nanotubes and 100-1000 parts of water; the invention also discloses a preparation method of the oil field fracturing cleanup additive. According to the formula provided by the invention, the composite fracturing cleanup additive is formed, the surface activity, the rheological property and the high temperature and high pressure resistance are remarkably improved, the flowability and the liquid drainage effect of the oil field fracturing fluid are effectively promoted, the accurately-controlled preparation method is adopted, the steps of stirring, reacting, cooling and pH adjusting are optimized, it is ensured that all the components are uniformly mixed and fully react, and the oil field fracturing fluid is prepared. The discharge aiding agent is suitable for various oil field fracturing operations, and the stability and the anti-pollution capability are enhanced.