146results about How to "Improve surface energy" patented technology

The present invention belongs to the field of mnacromolecule, relating to the fluorine-containing polyester of low surface energy and the preparation method of the fluorine-containing polyester. The polyester has the following chemical structure (1): wherein R f C is the straight chain of 2 - 21 C or the branch-chain pseudo-perfluoroalkyl; R1, R2 is the alkyl, aryl, or naphthenic base of the C1-C8; E is -(CH2) m-; formula (3) or formula (4); R' is H or the straight chain or the branch-chain alkyl under C4; m is an integer between 0 or 10. The polyester preparation method is that dibasic acid or the correspondent diester, dihydric alcohol and perfluoroalkane, which are 0.05 percent to 10 percent of the total material weight, are fused and polymerized under vacuum condition. The polyester preparation method at the pseudo-perfluoroalkyl sealed end is simple, and is of good drainage and oil dredging properties. The present invention can be widely used in antifouling coatings, and is of important development and application value.

The invention discloses a hydrophilic modification method of a PVDF ultrafilter membrane by the utilization of nano-TiO2 sol and belongs to the field of membrane separation technologies. According to the method, PVDF is used as the main high-molecular membrane preparation material. The hydrophilic TiO2 sol prepared in advance is added into a casting solution containing PVDF, an organic solvent and an additive, and the hydrophilic PVDF ultrafilter membrane is prepared by the utilization of a phase inversion method. By the adoption of the method, water contact angle of the prepared PVDF ultrafilter membrane can be reduced from about 85 degrees to about 60 degrees, and hydrophilicity of the PVDF membrane is obviously raised. Various substances concerned in the invention comprise, by weight, 10-25% of polyvinylidene fluoride (PVDF), 60-80% of a solvent for dissolving polyvinylidene fluoride, 1-10% of the TiO2 sol, and 0-10% of the additive, wherein the additive contains a mixture of anhydrous LiCl and PVP. Porosity of the prepared membrane is 50-80% and its membrane pore size is 0.01-0.2 micron. The method provided by the invention has a simple membrane forming technology, is convenient to operate, and is easy to realize industrial production. In addition, the prepared ultrafiler membrane has good hydrophilicity and high water flux, and has a wide application prospect.

The present invention relates to a method for preparing polyester modified organic silicon resin which is prepared from 45-75 wt% of saturated polyester, 1-10 wt% of 3-glycidyl ether oxygen propyl trimethoxy silane and 20-45 wt% of organic silicon resin by reacting. The acid value of the saturated polyester is within a range of 60 to 120 mgKOH / g, and the weight-average molecular weight of the saturated polyester is within a range of 2000 to 6000. The weight-average molecular weight of an intermediate of the organic silicon resin is within a range of 800 to 2000, the content of alkoxy of the organic silicon resin is within a range of 2.5 to 15%, and the content of hydroxyl of the organic silicon resin is within a range of 3 to 20%. By combining with advantages of saturated polyester and organic silicon resin, the method has advantages of excellent heat resistant quality, good metal adhesion, low surface energy, excellent boiling resistant quality and acid-alkali resistant quality, and good temperature variation resistant quality. The polyester modified organic silicon resin prepared by the method can be used for preparing a high temperature resistant coating with low surface energy.

The invention belongs to the field of super-amphiphobic materials and discloses a crosslinkable fluorosilicone resin, a coating and a super-amphiphobic coating prepared from the crosslinkable fluorosilicone resin and the coating. The crosslinkable fluorosilicone resin is compared via the steps as follows: hydrogeneous organosilicon A, crosslinkable substance B, fluorine-containing substance C and modified silicon dioxide D are mixed in a dissolvent, added into a reactor, and introduced with inert gas, agitation is kept at a speed of 100-1,000 rpm, the temperature is raised to 60-140 DEG C, an activator is added and agitated for 5-24 h, the reagent is deposited into n-hexane or methanol. The crosslinkable fluorosilicone resin coating is formed by crosslinkable fluorosilicone resin, a curing agent, an activator and a dissolvent; the super-amphiphobic coating is formed by that a substrate is immersed in the crosslinkable fluorosilicone resin painting, or the crosslinkable fluorosilicone resin painting is sprayed on the surface of the substrate and baked in a baking oven for 1-20 h at 40-120 DEG C.

The invention discloses a preparation method of ultraviolet-curable water-borne fluorinated paint with low surface energy. The preparation method comprises the following steps: (1), adding a (methyl) acrylate monomer, a monohydroxy (methyl) acrylate monomer, a fluorinated acrylate monomer and part of an initiator into a three-opening bottle, reacting for 3-5 hours at a temperature of 70-90 DEG C, supplementing the initiator, and further reacting for 1.5-3 hours; (2), adding polyisocyanate into another three-opening bottle, and reacting for 4-5 hours at a temperature of 30-50 DEG C; (3), dripping a reaction product in the step (2) into a reaction product in the step (1), and reacting for 10-12 hours; and (4), testing a reaction product in the step (3), determining the acid value, adding a salt-forming agent and deionized water in a certain ratio, shearing and removing the solvent. The ultraviolet-curable water-borne fluorinated paint combines performances of polyurethane and acrylate paint, is free of solvent emission, meets environment-friendly requirements, and is simple and feasible to spray and short in film-forming and curing time.

The invention belongs to the field of super-amphiphobic materials, and discloses amphiphilic crosslinkable fluorosilicon resin, a water-borne coating and a super-amphiphobic coating prepared through the water-based paint. The amphiphilic crosslinkable fluorosilicon resin is prepared by the means that hydrogen containing organic silicon A, the epoxy containing substance B, the fluorine containing substance C, modified silicon dioxide D and the hydrotropic substance E are mixed into a solvent, the mixture is added into a reaction kettle, inert gas is bubbled into the reaction kettle, the temperature is increased to 60-140 DEG C under the stirring condition, then the catalyst F is added, stirring is performed for 5-24 hours, and the reactant is precipitated into normal hexane or methyl alcohol; the amphiphilic crosslinkable fluorosilicon resin coating is dissolved in a aqueous-organic solvent, water is dropwise added into the maxture, so that the amphiphilic crosslinkable fluorosilicon resin coating is obtained; curing agent is added into the amphiphilic crosslinkable fluorosilicon resin water-borne coating, the mixture is stirred uniformly, then a base material is soaked into the amphiphilic crosslinkable fluorosilicon resin coating, or the amphiphilic crosslinkable fluorosilicon resin coating is sprayed on the surface of the base material, and drying operation is performed, so that the super-amphiphobic coating is obtained.

The present invention involves a cover for a spraying device of a robot which is formed from a polymer with enhanced residue retention properties. The polymer may be processed to increase the surface energy of the polymer. For example, the polymer may be subjected to a corona treatment in order to increase its surface energy. The corona treatment process may be performed on the polymer as received, prior to cutting or otherwise manipulating the polymer. Also, the polymer may be embossed to provide the enhancement. To assemble the polymer into a robot cover, the polymer as received may be cut into individual sections for assembly. The sections may then be assembled to one another by heat sealing the sections together. The heat sealing provides a bond between the individual sections of polymer that secures the individual sections together to create the robot cover. The polymer may also be formed into tubular sections for securing to the spraying device.

The invention publishes a method for producing the TiO2 / PVDF blending positive ion exchange membrane, which involves a method for producing high polymer organic membrane. This invention enhances the water affinity of PVDF positive ion exchange membrane, the mechanical strength and anti-pollution capacity. The positive ion exchange membrane includes FI ethane, polypropylene, crosslinking agent, titanium dioxide grain and organic solvent with activity groups. This invention is as follows: a. dissolving the FI ethane and polypropylene in the organic solvent; B. joining crosslinking agent; C. filtering insoluble substance; D. joining titanium dioxide grain; E, mixing the solution well-proportioned and deaeration; F, creating membrane on the glass plate; G, drying, and solidifying. The TiO2 / PVDF blending positive ion exchange membrane does not only retains the fine characteristic of FI ethane exchange membrane, but also improves the membrane surface energy,and enhances the water affinity, and increases the ability to repel outside pollutant.

The invention discloses a composite reagent for deep removal of heavy metals in wastewater and a preparation method thereof. The composite reagent is prepared from the following raw materials in parts by weight: a component A including 20-30 parts of modified attapulgite powder, 30-50 parts of a modified natural high molecular polymer and 0-3 parts of a surfactant; a component B namely an inorganic flocculating agent, wherein the weight ratio of the component A to the component B is (2.5-8.3):1. The composite reagent disclosed by the invention has very strong adsorption, chelating and flocculation performances on heavy metal ions in water, has a plurality of effects of auxiliary reduction of COD (chemical oxygen demand), decoloration, dephosphorization and the like at the same time, and is good in treatment effect, and the preparation method is simple and easy.

The invention provides a welding method for a target assembly. The welding method is used for welding a target and a back plate to form the target assembly. The method includes the steps that the back plate and the target are provided; molten solder is arranged on a welding face of the back plate; a steel brush is used for wetting the welding face of the back plate and the molten solder, and ultrasonic waves are used for processing the welding face of the back plate and the molten solder; the steel brush is used for processing a welding face of the target; and the welding face of the target and the welding face of the back plate are attached so as to weld the target and the back plate. The welding method has the beneficial effects that the contact area between the molten solder and the welding face of the back plate is enlarged, atoms of the solder can be conveniently and more quickly dispersed onto the welding face of the back plate, and therefore the molten solder can conveniently wet the surface of the welding face of the back plate, and the welding quality of the target and the back plate is higher.

Disclosed herein are a polyolefin microporous membrane of which surface is modified by a hydrophilic polymer, a surface modification method thereof and a lithium ion polymer battery including the surface-modified polyolefin microporous membrane as a separator.The polyolefin microporous membrane of which surface is modified by a hydrophilic polymer minimizes membrane distortion by employing plasma-induced coating method and also increase the membrane's mechanical strength and heat resistance. In addition, the polyolefin microporous membrane enhances the ability of impregnating an electrolyte solution by increasing polarity and surface energy on its surface through modification to hydrophilic surface, and enhances the adhesion between a separator and an electrode, between a separator and an electrolyte solution or gel polymer electrolytes. Further, the lithium ion polymer battery including the polyolefin microporous membrane of which surface is modified by a hydrophilic acrylic polymer as a separator has enhanced cycle life and rate capability.

The invention relates to a method to prepare a new hydrophilic coating for outside wall containing nmself-crosslinking acrylic ester latices and nm inorganic powder. Its dispensation is:nm indoor crosslinking acrylic ester latex(5-40%), indoor crosslinking acrylic ester latex(20-50%),inorganic nm powder(0.1-20%),inorganic filler(10-50%),film-forming assistant(0.05-5.0%) and the other is water without ion. Its preparing method is:firstly use high speed dispersion and sand grinding method to prepare nm disperseion and filler color which are then mixed with nm self-crosslinking acrylic ester latex and general acrylic ester latex, add into assistant and stir them by media-low speed for 0.5-1.5h,filter and package. The coating has good stability and film-forming performance,strong adhesive force and resistance to pollution, outstanding thermo insulating property, as well as self-cleaning performance.

The invention provides a preparation method for preparing hard templates with low price, high reusability and adjustable micro-nano dimension used for nanoimprint in a large scale. The method comprises the following steps: firstly, adopting an electrochemical method for preparing regular anodized aluminum oxide (AAO) templates in oxalic acid electrolyte; then, forming a layer of perfluorooctane 1, 3-chlorosilane (CF3(CF2)5(CH2)2SiCl3) demolding agents through vapor deposition on the surface of AAO; spin coating a layer of ultraviolet curable or thermally curable photoresist on a silicon or quartz substrate; copying micro-nano structures of the anodized aluminum oxide templates to the surface of the photoresist by utilizing an ultraviolet nanoimprint or thermal nanoimprint technology; and finally, using reaction ion beams for etching (RIE). Thereby, the silicon or quartz templates which can be prepared in a large scale, have the advantages of low price, high reusability and adjustable micro-nano dimension and can be used for nanoimprint can be obtained on the silicon or quartz substrate.

The invention relates to the field of non-stick coatings. In order to solve the problem that existing non-stick coatings are low in surface energy and the hardness and wear resistance cannot satisfy the requirements, the invention provides a modified silica sol and a preparation method thereof. The modified silica sol is prepared by the following steps: adding fluorosilane and titanium tetrabutoxide into the silica sol; then, adjusting the pH to 4-5; stirring at 20-60 DEG C; and maintaining for 1-8 hours to obtain the modified silica sol. According to the modified silica sol, the surface energy of the silica sol can be effectively reduced. The modified silica sol provided by the invention applied to non-stick coatings has the advantages of wear resistance, high hardness, good non-stick property and the like.

The present invention generally relates to polymeric membrane materials formed, at least in part, from monomeric material selected from 2,3,3,3-tetrafluoropropene (CF3CF═CH2, HFO-1234yf) or trans-1,3,3,3-tetrafluoropropene (CF3CH═CFH, HFO-1234ze), and to membrane preparations and uses thereof in water desalination, filtration, membrane distillation, pervaporation, and selective gas separation.

The invention relates to organic silicone modified acrylate emulsion and a preparation method thereof. The organic silicone modified acrylate emulsion is synthesized through a hard monomer, a soft monomer, a cross-linking monomer, an organic silicone monomer and a reactive emulsification monomer under the action of an initiator at one time; the preparation method comprises the following steps: dissolving the initiator into deionized water; uniformly mixing the hard monomer, the soft monomer, the cross-linking monomer and the organic silicone monomer in a premixing tank; adding an emulsifier and deionized water into a four-mouth flask to be heated to 70-90 DEG C, slowly dropwise adding the uniformly-mixed monomer mixed phase and 90% of an initiator solution for 1-3 h at the temperature of 70-90 DEG C and the rotating speed of 200-400 r / min, carrying out heat preservation for 1-3 h at the temperature of 70-90 DEG C after dropping, meanwhile, dropwise adding 10% of the residual initiator solution, and adding ammonia water for adjusting the PH to 6-8 after cooling to 50 DEG C or below. The migration of the emulsifier in a latex film is avoided through application of the reactive emulsifier and the defects of hot sticking and cold shortness of the pure acrylic resin are overcome through organic silicone modification.

The invention belongs to the technical field of preparation of composite membranes, and relates to a preparation method of a polyvinylidene fluoride (PVDF) mesoporous membrane, and the method includes the following steps: dissolving polyvinylidene fluoride powder in an organic solvent, adding a pore forming agent, stirring evenly to prepare a polyvinylidene fluoride membrane casting solution; adding SBA-15 to obtain a mixed solution, heating and stirring the mixed solution to prepare a polyvinylidene fluoride-silica membrane casting solution; sealing, standing for defoaming; using an automatic coating machine to coat a glass substrate with the PVDF-SBA-15 membrane casting solution, and immersing the glass substrate in a solidification liquid to obtain a polyvinylidene fluoride-silica composite membrane. The preparation method is simple in operation, the membrane is prepared at low temperature, the polymer degradation can be reduced, the strength of the membrane is ensured, the prepared PVDF-SBA-15 can effectively improve the hydrophilic ability and water flux of the membrane, and the membrane has good application prospects in the field of water pollutant removal.

The invention provides a preparation method of a photocatalysis self-cleaned amphiphilic network ocean anti-flouring coating. The preparation method is characterized by comprising the following steps: preparing an amphiphilic triblock copolymer according to an ATRP (atom-transfer radical-polymerization) method; modifying the obtained amphiphilic triblock copolymer by using an acyl halide monomer so as to obtain an amphiphilic block copolymer with unsaturated double bonds; performing ultraviolet irradiation on the amphiphilic block copolymer with unsaturated double bonds, a cross-linking agent and MPTS (methacryloxy propyl trimethoxy silane) modified nano titanium dioxide to implement a curing cross-linking reaction, so as to obtain an MPTS modified nano titanium dioxide hybridized amphiphilic copolymer network coating; sequentially putting the obtained MPTS modified nano titanium dioxide hybridized amphiphilic copolymer network coating into a trimesoyl chloride solution and a dispersing liquid of amino acid amphiphilic ion modified titanium dioxide nanoparticles, implementing reactions, and taking out, so as to obtain the photocatalysis self-cleaned amphiphilic network ocean anti-flouring coating. The photocatalysis self-cleaned amphiphilic network ocean anti-flouring coating can be applied to aspects such as ship coating and long-term anti-flouring of underwater equipment. The invention further discloses a method for preparing an amphiphilic copolymer network.

The invention relates to the technical field of spraying waste gas treatment, in particular relates to a paint mist treatment method and a spraying tank. The paint mist treatment method comprises the following steps: (1) carrying out spraying adsorption on spraying waste gas by a water curtain formed by circulating water on a water screen baffle plate; (2) enabling the spraying waste gas to enter a rotary washing drum, carrying out rotary washing on the spraying waste gas, and carrying out spraying absorption on the spraying waste gas by a spraying device arranged at the top part of the rotary washing drum; (3) exhausting the spraying waste gas after treating the spraying waste gas through a demisting layer, wherein a paint mist decomposer and a paint mist catcher are added in the circulating water which is used for treating the spraying waste gas. According to the paint mist treatment method disclosed by the invention, the technologies of water screen spraying, rotary washing and spraying adsorption are combined, and a good paint mist removing effect is obtained; the paint mist decomposer and the paint mist catcher are matched with each other to be added in the circulating water, so that paint mist can be effectively prevented from sticking on the inner wall of the spraying tank; the paint mist in the circulating water is enabled to be flocculated and floats up, so that cleaning of floating paint mist scum is facilitated, the service cycle of the circulating water is prolonged, and the damage to equipment is reduced.

The invention relates to a pre-wetted modified dust-free cleaning cloth and making method thereof. The making method of the pre-wetted modified dust-free cleaning cloth includes the following steps: modification: organic compound modifier aqueous solution is adopted for carrying out after finishing on dust-free cleaning cloth, water bath ratio is 1:5-50, the concentration of organic compound modifier is 0.1-10%, the organic compound modifier is provided with a hydroxyl and an active group, the active group is hydroxyl, amidogen or sulfo group, reaction temperature is 90-170 DEG C, reaction time is 1-30min; and pre-wetting: pre-wetting agent is adopted to pre-wet the dust-free cleaning cloth after being modified. The invention utilizes organic compound modifier provided with active group to modify the dust-free cleaning cloth in advance, surface energy of the dust-free cleaning cloth can be obviously improved, absorbability on granule and imbitition effect can be improved, and the function of removing organic molecule or inorganic ion dirt can be realized while realizing dust particle and metal dust capturing.

The invention discloses high-performance wind-power generating facility coating prepared by taking organic fluorinated silicone modified elastic polyurethane-urea resin as substrate. The high-performance wind-power generating facility coating is prepared from component A and component B according to proportion. The wind-power generating facility coating has toughness, attrition resistance, high elasticity, excellent mechanical property, yellowing resistance, good colour retention, high ultraviolet resistance, high weather resistance, favorable and excellent electrical insulation, chemical stability, moisture resistance and freeze resistance. In addition, the wind-power generating facility coating has high performance and moderate cost and can strongly protect the wind-power generating facility, reduce the maintenance frequency and lower the purchasing cost of the wind-power generating facility, thereby having extremely high implementation value and social and economic benefit.

The present disclosure provides a device and a cell culture system comprising a substrate that generates significant chemical ion signatures adapted for culturing stem cells. This disclosure further provides unique surface properties, such as surface wettability, along with defined polymer microspot environments in an array, for effectively supporting the propagation and differentiation of human pluripotent stem cells in vitro. Methods of culturing, maintenance, differentiating stem cells as well as reprogramming somatic cells into stem cells using the device and the cell culture system with the suitable substrates, along with suitable culture media, are also provided.

The present invention involves cover for robots having spray nozzles wherein the surface material of the covers have been enhanced for residue retention. The robot covers of the present invention may be formed from a polymer, which in one exemplary embodiment may be polyethylene. For example, the polymer may be received in the form of a cast or blown extruded plastic film. In one exemplary embodiment, the polymer may be processed to increase the surface energy and / or surface area of the polymer. By increasing at least one of the surface energy and the surface area of the polymer, the total energy of the surface of the polymer is increased.

The invention discloses an anticorrosive tough coating material for an outdoor communication tower, and a preparation method thereof, wherein the anticorrosive tough coating material is prepared fromthe following raw materials by weight: 12-18 parts of a polytrifluorochloroethylene resin, 35-45 parts of a bisphenol A type epoxy resin, 8-12 parts of polyphenylmethylsiloxane, 2-6 parts of alpha,omega-dihydroxy polydimethylsiloxane, 2-6 parts of amino-modified polysiloxane, 2-6 parts of hexamethyldisilazane, 2-6 parts of gas-phase nanometer silicon dioxide, 7-11 parts of silicon carbide short fibers, 12-16 parts of mica iron oxide powder, 2-8 parts of xylene, 10-20 parts of an acetone aqueous solution and 1-3 parts of a polyamine mixed curing agent. According to the invention, the prepared anticorrosive tough coating material has excellent anticorrosive performance, weather resistance and good elasticity; and by coating the communication tower with the anticorrosive tough coating material, the coating is compact, has excellent anticorrosive, anti-aging, hydrophobic, stain-resistant and impact-resistant effects, can well adapt to severe environments, and effectively prolongs the service life of the communication tower.

The invention relates to a fluorocarbon coating for anticorrosion of offshore environment concrete. The invention provides a water-based fluorocarbon coating for anticorrosion of offshore environmentconcrete. Concrete is protected for a long time by utilizing weather resistance, heat resistance, corrosion resistance and durability of a fluorine-containing acrylic emulsion. Water is used as a dispersion medium, no organic solvent is contained, and the green and environment-friendly requirements are met. The coating has excellent corrosion resistance, weather resistance, aging resistance and the like, the hardness of a coating is improved, and the protection effect on a concrete building can be enhanced.

The invention relates to the technical field of material surface treatment, in particular to a preparation method of a vacuum coating. The preparation method comprises the following steps: a, high pressure ion washing and activating: a workpiece is placed in a vacuum chamber and vacuumized, when the pressure of the vacuum chamber is between 3Pa and 20Pa, vacuumization stops, a high-tension transformer is started, when the output voltage of the high-tension transformer is between 2500V and 4000V, and the current of the high-tension transformer is between 1A and 6A, the air is ionized to plasma under the condition of glow discharge, the workpiece is washed through a plasma body in a bombardment mode, the activating time is from 1 minute to 5 minutes, and a bombardment power source is turned off; and b, vacuum coating: the vacuum coating process is conducted on the workpiece after high pressure ion washing and activating in the vacuum chamber, and a metal coating is prepared on the surface. The prepared vacuum coating can damage an organization structure on the surface of nonpolar materials and improve surface energy and performance of products.

The invention discloses a coating composition, which contains a thermosetting resin, an amino resin, a filler and a solvent, and selectively contains an auxiliary agent, wherein the coating composition also contains modified nanometer calcium carbonate, and the modified nanometer calcium carbonate is a product that the nanometer calcium carbonate contacts an acrylic ester polymer containing carboxyl. A method for preparing the coating composition comprises the following steps: the thermosetting resin, the amino resin, the filler and the solvent are mixed, wherein the modified nanometer calcium carbonate is also added into the mixture during the mixing, and is the product that the nanometer calcium carbonate contacts the acrylic ester polymer containing the carboxyl. Compared with the prior amino baking enamel with titanium white added as pigment, the coating composition has excellent shock resistance and low cost, and has strong bonding force with substrates and finishing coats.

The invention discloses paint used for cosmetic packaging bottles, and a preparation method and coating technology thereof. The paint includes waterborne resin emulsion, a filling material, an auxiliary agent, a barrier-type antibacterial agent and deionized water; the waterborne resin emulsion is formed by amino silicone oil modified acrylic resin emulsion and montmorillonite modified waterbornepolyurethane emulsion according to a mass ratio being 1 : 1-1.2 through mixing; the barrier-type antibacterial agent includes epoxy resin emulsion, a film-forming auxiliary agent, chitosan, a lotus leaf hydrophobic agent and antibacterial liquid; and the antibacterial liquid is prepared by mixing silver-loaded zeolite, eucalyptus oil and lemon oil according to a mass ratio being 1 : (0.5-0.9) : (0.6-1) to grind into particle sizes that are less than or equal to 1 [mu]m. The coating technology of the paint includes three steps which successively are surface pretreatment, primary spraying and secondary spraying. The paint has advantages of being good in barrier property and high in antibacterial property.

The invention provides an echo wall mode spherical optical micro-cavity refractive index sensor based on surface plasmas and a measuring device. The high-quality factor characteristic of the echo wallmode optical micro-cavity is fully utilized, the surface of the optical micro-cavity is plated with a gold layer to excite surface plasmas, the surface energy and refractive index sensing sensitivityof the optical micro-cavity are improved, and the refractive index of an external medium is measured. The optical micro-cavity refractive index sensor comprises a micro-nano optical fiber and an echowall mode spherical optical micro-cavity, wherein the micro-nano optical fiber is in contact coupling with the echo wall mode spherical optical micro-cavity, and the surface of the echo wall mode spherical optical micro-cavity is plated with a crescent gold layer to excite surface plasmas so as to enhance the sensitivity of the spherical optical micro-cavity to the change of the refractive indexof an external medium. The sensor has the advantages of small size, simple preparation method, easiness in integration and the like, and can be applied to the fields of chemical or biological sensingand the like.