319 results about "Membrane layer" patented technology

The present application relates to a hybrid membrane for an electrochemical device, the hybrid membrane comprising: a membrane layer comprising: a modified metal-organic framework (MOF) material wherein the modified MOF material is a MOF material modified with one or more of a lithium salt, a carboxylic acid, or an amino acid, and a binder material, the adhesive layer is used for adhering the modified MOF material to the porous supporting layer so as to form a film layer on the porous supporting layer; and the porous support layer is used for providing mechanical support for the membrane layer. The present application also relates to a method for preparing the hybrid membrane, an electrochemical device comprising the hybrid membrane and the use of the hybrid membrane for inhibiting Lewis acid by-products in an electrochemical device.

The invention provides a preparation method of a metal-based ceramic composite membrane with a catalytic ozone function. The preparation method comprises the following steps: preparing functional powder by taking tetrabutyl titanate as a titanium source and silver nitrate or ferric nitrate as a catalytic active metal source and adopting a sol-gel method; a porous metal pipe is used as a supporting body, metal powder and functional powder which are made of the same material as the supporting body are mixed to prepare functional slurry, the functional slurry is evenly deposited on the inner wall of the supporting body through vacuum filtration, and powder particles which are not firmly combined are removed through back flushing; and finally, the binding force between the functional film layer and the metal matrix is improved through high-temperature heat treatment. Wherein the thermal expansion coefficient difference between the metal supporting body and the functional film layer can be reduced by adding the metal powder, the metal powder is melted and diffused in the high-temperature heat treatment stage, and metallurgical bonding is formed between the functional powder and the metal substrate. The method is simple in process, and the prepared metal-based ceramic composite membrane has the advantages of being high in membrane layer binding force, not prone to falling off, high in catalytic activity, high in anti-pollution capacity, stable in operation and the like.

The invention provides an intelligent response nano-film and application thereof in waste lead-acid storage battery electrolyte recycling, and relates to the technical field of waste lead-acid storage battery electrolyte recycling, the intelligent response nano-film breaks through performance limitation of an existing film system through a specific intelligent material structure, and when heavy metal ions such as Pb < 2 + >, Fe < 3 + > and Cu < 2 + > enter the film, the intelligent response nano-film can be recycled, and the service life of the intelligent response nano-film is prolonged. The metal ligands are combined with metal ions to cause local shrinkage or closing of pore channels, so that the active defense and intelligent blocking effects of blocking heavy metals are achieved; and when SO4 < 2-> and H < + > pass through the channel, membrane pore channels are kept in an open state, so that rapid acid flux (namely the amount of substance passing through the membrane layer in unit time) of sulfuric acid is realized. The intelligent response nano film has a programmable aperture of a polymer liquid crystal network and an intelligent response valve mechanism of metal, and selective separation of heavy metal and sulfuric acid is realized by stimulating reversible adjustment of an induced film structure.

The invention provides a secondary battery, a power utilization device and a binder, the secondary battery comprises a positive pole piece, a negative pole piece and an isolating membrane, the negative pole piece comprises a negative current collector and a negative membrane layer arranged on at least one surface of the negative current collector; the negative electrode film layer comprises a negative electrode active material and a first binder; the mass ratio of the negative electrode active material in the negative electrode film layer is 96%-98.4%; the mass ratio of the first binder in the negative electrode film layer is 0.5%-3%; the first binder includes a polymer including-COOM,-CONH2,-CN, and-COOR, where M includes an alkali metal, and R includes a substituted or unsubstituted C1-C20 alkyl group. The secondary battery in the present application has improved energy density and does not deteriorate processability.

The application relates to the technical field of batteries, in particular to a composite solid electrolyte membrane and a preparation method and application thereof. The composite solid electrolyte membrane comprises the following layers which are sequentially stacked: a first membrane layer comprising a polymer, a solid electrolyte and a lithium salt; a second membrane layer comprising a polymer, a solid electrolyte and a lithium salt; and a third membrane layer which is an interface layer; wherein the solid electrolyte and the lithium salt content of the second membrane layer are higher than those of the first membrane layer, and the polymer is formed by polymerization of raw materials comprising triacetyl cellulose (TCA) and polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP). The composite solid electrolyte membrane has improved high-temperature resistance and good ion transmission performance.

The invention provides a biocompatible membrane which is prepared from a membrane layer working solution through a membrane forming process, the membrane layer working solution comprises amphiphilic polyurethane, and the amphiphilic polyurethane is prepared by any one of the following methods: hydrophilic molecules and hydrophobic molecules form an amphiphilic polymer through chemical bonding, the amphiphilic polymer and an isocyanate substance are subjected to an addition polymerization reaction to prepare the polyurethane resin. Or one of hydrophilic molecules or hydrophobic molecules and isocyanate substances are subjected to an addition polymerization reaction to prepare polyurethane, and then the polyurethane and the other molecule are subjected to chemical bonding to form the amphiphilic polyurethane. The invention also provides a preparation method of the biocompatible membrane and an analyte sensor using the biocompatible membrane. The biocompatible membrane provided by the invention can simultaneously control the permeation ratio of two analytes, when the biocompatible membrane is used as an outer membrane of an analyte sensor, only one layer of biocompatible membrane is needed to meet the monitoring requirement, and the detection accuracy can be ensured.

The invention provides a microchip model for microbial visual fermentation and an application of the microchip model. The chip comprises a ventilation layer, a semi-permeable membrane layer and a culture layer, a gas micro-channel and a gas chamber are arranged on the lower surface of the ventilation layer and are used for providing a gas environment required by microbial fermentation; the culture layer comprises a liquid microchannel and a culture chamber and is used for microorganism culture; the two layers are separated by a semipermeable membrane. The ventilation layer and the semi-permeable membrane layer are arranged above the culture layer to provide a suitable gas environment for microorganisms, meanwhile, the culture chamber is connected with the micro-pressure device to provide sufficient nutrient substances for the microorganisms, and the culture layer is provided with the transparent thin bottom to achieve real-time monitoring of single cell behaviors and the fermentation product synthesis process. The problems that traditional sampling is large in destructiveness and fermentation cannot be monitored in real time are solved, and an efficient research tool is provided for research on the fermentation product synthesis mechanism and in-situ modification of the fermentation product.

The invention relates to a membrane material, in particular to a mixed matrix membrane with high filler loading capacity and a preparation method thereof. According to the invention, the MOF particle modification layer polymer and the film-forming polymer both adopt PIM-1, so that the interface energy is reduced, and the compatibility between the filler and the film layer is improved, thereby greatly increasing the filler loading capacity in the film-forming polymer.

The utility model belongs to the technical field of testing, and particularly relates to a seed coating agent film layer strength testing machine which comprises a machine body, a machine table, two supporting columns, a top plate, a hydraulic cylinder, a connecting plate, a testing disc and a testing pressing head, the machine table is fixed to the top of the machine body, the bottoms of the two supporting columns are fixed to the two sides of the machine table, the top plate is connected with the supporting columns, and the hydraulic cylinder is connected with the testing disc. The hydraulic cylinder is fixed at the bottom of the top plate, the telescopic end of the hydraulic cylinder is connected with the connecting plate, the test pressure head is fixed at the bottom of the connecting plate, a plurality of electric push rods are mounted at the bottom of the test pressure head, the bottom of each electric push rod is connected with a test pressure plate, and a sensor is arranged at the bottom of each test pressure plate. According to the utility model, each seed coating agent on the supporting groove can be pressed and tested by the test pressure head, so that the test effect of the test machine on a seed coating agent film layer is improved, and the deviation of the strength test result of the seed coating agent caused by non-uniform stress of the seed coating agent due to the size difference of the seed coating agent is prevented.

This document describes systems and methods for treating and recovering water from feed solutions using a multilayer module with an expansion chamber. The multilayer module comprises a feed spacer layer, a permeate spacer layer and a membrane layer, wherein water vapor evaporated from the feed solution in the feed spacer passes through the membrane layer into the permeate spacer layer. The expansion chamber receives the water vapor from the permeate spacer layer and the feed solution from the feed spacer layer.

The invention discloses a composite film, a composite film preparation method and a microphone. The composite membrane comprises a fiber membrane layer, the fiber membrane layer is provided with a plurality of pores, the pores are filled with silicone rubber filler, and / or at least one surface of the fiber membrane layer in the thickness direction is covered with a silicone rubber layer. The fiber membrane layer can provide high mechanical strength for the composite membrane, and the silicone rubber filler filled in the gaps and / or the silicone rubber layer covering the surface of the fiber membrane layer can improve the waterproof performance of the composite membrane, so that the overall strength and waterproof performance of the composite membrane can be improved.

This invention provides a hydrocarbon gas separation system, comprising a double-layered tube assembly and a negative pressure system. The double-layered tube assembly includes a medium delivery inner tube, a multi-layered membrane assembly, an annular interlayer gap, and a pressure-bearing protection section outer tube. The double-layered tube assembly is sealed at both ends. The multi-layered membrane assembly includes a retention layer, an isolation layer, and a selectively permeable membrane layer. The medium delivery inner tube is nested inside the pressure-bearing protection section outer tube and encloses the multi-layered membrane assembly. The negative pressure system is connected to the double-layered tube assembly. After the mixed gas is processed by the multi-layered membrane assembly in the medium delivery inner tube, sulfur dioxide is retained. The hydrocarbon gas enters the annular interlayer gap for extraction, and the retained sulfur dioxide is released back into the gas. Finally, the gas enters a sulfur dioxide detection instrument and is detected using ultraviolet fluorescence, making the data more consistent with the actual value and providing a scientific basis for relevant decision-making.

This invention belongs to the field of hollow fiber membrane preparation technology, and discloses a braided tube-reinforced polyvinylidene fluoride hollow fiber hydrophobic membrane, its preparation method, and its application. The polyvinylidene fluoride hollow fiber hydrophobic membrane includes a braided tube and a hydrophobic membrane layer formed on the surface of the braided tube. The outer diameter of the braided tube-reinforced polyvinylidene fluoride hollow fiber hydrophobic membrane is 0.3-3 mm, the tensile breaking strength is greater than 100 N, and the pure water permeability is 200-7500 L / (m²). 2 •h)@0.1MPa 20℃. The preparation method includes: preparing a casting solution by combining polyvinylidene fluoride resin, organic solvent, composite pore-forming agent, and optionally polytetrafluoroethylene microparticles; extruding the casting solution onto the outer surface of a braided tube using a hollow fiber membrane spinning machine, and forming a membrane through phase separation in a coagulation bath. This invention significantly improves the mechanical strength of the membrane through braided tube reinforcement and achieves high flux and high hydrophobicity using a water-inorganic-organic composite pore-forming agent, making it suitable for high-performance separation processes such as membrane distillation, membrane contactors, and gas separation.

The utility model discloses a kind of hemispherical resonator gyroscopes and flat plate electrodes, flat plate electrode includes quartz sheet, its upper surface is equipped with by the frame pattern with set line width is separated GND film layer and multiple electrode film layers, multiple electrode film layers are arranged in circumferential interval, GND film layer is extended from quartz upper surface edge to surround multiple electrode film layers by inside;Multiple grooves are equipped on the lateral wall surface of quartz sheet, groove extends to the lower surface of quartz sheet and is penetrated, groove includes a ground groove and multiple electrode grooves, multiple electrode grooves and multiple electrode film layers one-to-one correspondence, each electrode film layer extends to the groove wall of corresponding electrode groove by inside, ground groove is located between two adjacent electrode grooves, the region corresponding to GND film layer and ground groove extends to the groove wall layer covering ground groove by inside.The utility model can solve the problem that hemispherical resonator gyroscope assembly reverse welding is difficult, vibration is easy to fall off.

The utility model provides a kind of fabric for clothing and contain its sweat suit. The fabric includes surface layer, membrane layer and bottom layer. The surface layer uses warp plain or weft plain knitting technology, and is treated using water repellent finishing process. The water repellent finishing process used by the surface layer contains fluorine-free water repellent auxiliary and C4, C6 water repellent auxiliary. The membrane layer is thermoplastic polyurethane membrane layer or polyurethane membrane layer. The sweat suit prepared by the above-mentioned fabric has windproof and light rainproof effect, providing comfortable wearing experience for the wearer.

1. The name of the design product: the main body of a biological particle separator with a transparent membrane layer. 2. The use of the design product: the design product is the main body of a biological particle separator with a transparent membrane layer, which is a device or system for separating specific biological particles (such as cells, organelles, proteins, nucleic acids, viruses, etc.) from complex mixtures. 3. The design points of the design product: the shape shown by solid lines in the view. 4. The picture or photo that best indicates the design points: Design 1 perspective view 1. 5. Design 1 is designated as the basic design. 6. Other circumstances that need to be explained: the part represented by solid lines in the view is the design for which protection is sought, and the part represented by dashed lines does not constitute the design content for which protection is sought. The circular membrane marked by letters A-F in the view is transparent.

This invention relates to the field of nanofiltration membrane technology, and more particularly to a crown ether-modified positively charged polyamide / carbon nanotube nanofiltration membrane, its preparation method, and its applications. The nanofiltration membrane is constructed by attaching a carbon nanotube interlayer to a substrate membrane, followed by the preparation of a crown ether-modified polyamide membrane layer on the carbon nanotube layer via interfacial polymerization. Further, positively charged molecules are grafted onto the membrane surface, resulting in a composite functional structure where the surface exhibits the positive charge of the grafted molecules, the internal lithium-ion recognition properties of the crown ether, and the conductivity of the carbon nanotubes at the bottom. The positively charged layer of this nanofiltration membrane possesses a strong size sieving effect and Donan repulsion effect for positively charged divalent magnesium ions, while the crown ether provides a dedicated channel for lithium ions, enabling rapid lithium-ion transport under electro-driven conditions. This endows the nanofiltration membrane with the characteristic of simultaneously "intercepting magnesium ions and allowing lithium ions to pass through," thereby achieving highly efficient lithium-magnesium separation applications.

The utility model relates to the technical field of wiring wells, in particular to a municipal road crossing wiring well structure which comprises an original soil base layer, a foundation pit is formed in the surface of the original soil base layer, and a wiring well body is arranged in the foundation pit. The wiring well body comprises a supporting cushion layer, a water collection pit, an inner side well body, an outer side well body, a water collection groove, an iron grate, a fixing clamping groove, a water drainage pipe, a threading protection pipe, a waterproof coiled material layer and a waterproof coating layer, the inner side well body, the outer side well body and the supporting cushion layer are integrally poured through concrete, and the fixing clamping groove is formed in the inner side edge of the upper end of the outer side well body; a well cover plate is clamped in the fixed clamping groove; the wiring well body is provided with the inner layer and the outer layer, the wiring part is arranged in the inner side well body, the outer side well body plays a role in protection and prevents underground water from permeating, meanwhile, rainwater permeating from the upper side can be collected into the water collecting groove, and when the amount of rainwater permeates into the inner side well body, the rainwater can also be collected into the water collecting pit, so that the water collecting effect is improved. And the safety of the pipeline is effectively improved.

The application provides a semiconductor structure and a preparation method thereof. The semiconductor structure preparation method comprises the following steps: arranging a plurality of first components on a first carrier plate; arranging a plastic sealing film layer on the first carrier plate; the plastic sealing film layer is a pre-formed film layer, and the thickness of the plastic sealing film layer is smaller than that of the first component; the plastic sealing film layer covers the first component and the exposed area of the first carrier plate; and a metal layer is formed outside the plastic sealing film layer. The preparation method of the semiconductor structure is advantageous in improving the reliability of the semiconductor packaging structure by introducing the pre-formed plastic sealing film layer arranged on the first component, and the thickness of the plastic sealing film layer is smaller than that of the first component.

The utility model provides a side leakage prevention nursing pad, which relates to the technical field of nursing pads, and comprises a main body pad and a covered edge, the covered edge covers the edge of the main body pad, the main body pad comprises a soft cotton layer, an absorption layer and a leakage prevention film layer, the absorption layer covers the lower part of the soft cotton layer, and the leakage prevention film layer covers the lower part of the absorption layer; capillary tubes are arranged on the two sides of the interior of the covered edge, one end of each capillary tube extends out of the covered edge, liquid outlet holes are formed in the inner sides of the two capillary tubes and connected with liquid absorption line nets, and the liquid absorption line nets on the two sides are arranged between the absorption layer and the leakage-proof film layer. The soft cotton layer, the absorption layer and the leakage-proof film layer form the main body pad, and the periphery of the main body pad is wrapped with the wrapping edge, so that enclosing, liquid prevention and side leakage prevention are facilitated, the use is more reliable, medicaments are prevented from being directly coated and contacted with the skin of a patient, the comfort degree is improved, different medicaments can be injected according to requirements, and the functions are diversified.

The invention discloses a preparation method of a silicon carbide film with a cobweb structure. The method comprises the following steps: firstly preparing polycarbosilane solutions with different concentrations, then soaking a prepared silicon carbide membrane tube in the solution, and forming silicon carbide with a cobweb structure in membrane pores under the action of high-temperature calcination, thereby achieving the effect of reducing the pore diameter of the silicon carbide membrane. According to the structure, the rejection rate of the silicon carbide film is improved under the condition that the flux is not sacrificed, and a new thought is provided for preparing the silicon carbide film layer.

The invention discloses a ZIF-8 self-supporting membrane based on ultra-small nano particle stacking as well as a preparation method and application thereof, and belongs to the technical field of preparation of MOF (Metal Organic Framework) membrane materials. The invention aims to solve the problems that the existing ZIF-8 membrane preparation process is complicated, depends on a support body or a secondary growth process, and is easy to generate defects and insufficient in purity. The preparation method comprises the following steps: firstly preparing ultra-small ZIF-8 nanoparticles with the particle size of 10-30nm, dispersing the ultra-small ZIF-8 nanoparticles in methanol, carrying out centrifugal concentration to obtain 50-90mg / mL slurry, then coating a substrate with the slurry, naturally airing at room temperature, and stripping to obtain the ZIF-8 self-supporting membrane. The method does not need to introduce a support body, a secondary growth step and an auxiliary binding phase, is mild in preparation condition and simple and convenient in flow, and can reduce the process threshold and the production cost; the obtained ZIF-8 self-supporting membrane is of a pure ZIF-8 polycrystalline structure, the membrane layer is flat and compact, the penetrability defect is avoided, the micropore structure and the high specific surface area characteristic of ZIF-8 are completely reserved, the batch repeatability is good, good application potential is achieved in the field of gas separation, and large-scale application of the ZIF-8 membrane is promoted.

The invention provides a covalent organic framework multi-claw acyl chloride suture membrane based on secondary amine sites as well as a preparation method and application thereof, and relates to the technical field of water treatment. A secondary amine site exposed in a covalent organic framework membrane skeleton is used as a reaction active center, and a multi-claw cross-linking agent with multiple acyl chloride functional groups is introduced, so that the multi-claw cross-linking agent is subjected to a directional amidation reaction between membrane layers, and a multi-point covalent stitching effect between nanosheets is realized. According to the covalent organic framework multi-claw acyl chloride suture membrane, interlayer defects are remarkably reduced, the pore channel structure is more regular, the excellent salt interception performance is achieved, the multi-claw covalent suture method is high in universality, easy and convenient to operate and high in repair degree, the membrane structure stability is remarkably improved, and the application prospect is wide. A good strategy is provided for application of the covalent organic framework membrane in salt interception in water treatment, and the application prospect is good.

A microelectromechanical pressure sensor. The microelectromechanical pressure sensor includes a substrate and a first pressure sensor arrangement disposed on an upper side of the substrate. The first pressure sensor arrangement includes a first membrane, which is formed by an outer membrane layer of a layer sequence of the first pressure sensor arrangement that faces away from the upper side of the substrate. The substrate and the first membrane enclose a first cavity. The layer sequence includes an inner membrane layer, which is disposed in the first cavity and between the upper side of the substrate and the outer membrane layer. The outer membrane layer is at least partially mechanically and / or electrically connected to at least the inner membrane layer.

The utility model belongs to the technical field of food packaging, and particularly relates to a nuclear track membrane spontaneous type controlled atmosphere patch for fresh keeping of a fruit and vegetable box and the fruit and vegetable box. The spontaneous controlled atmosphere patch of the nuclear track membrane for fresh keeping of the fruit and vegetable box comprises a nuclear track membrane layer, an inner protection layer and an outer protection layer are arranged on the two sides of the nuclear track membrane layer respectively and are of a net structure, a plurality of annular adhesive layers are arranged on the side, away from the nuclear track membrane layer, of the inner protection layer, and the outer protection layer is arranged on the side, away from the nuclear track membrane layer, of the outer protection layer. Each annular adhesive layer is a single adhesive layer, each single adhesive layer is made of the same adhesive, and adjacent single adhesive layers are made of different adhesives. The modified atmosphere patch is of a three-layer structure, so that the refreshing time of fruits and vegetables can be prolonged; the fruit and vegetable box adhesive has a good bonding effect with various fruit and vegetable boxes made of different box materials, and is convenient and fast to use.

The application discloses a high-transparency nano-resin lens, which comprises a resin substrate, a nano-cellular membrane layer adhered to the front surface of the resin substrate through an organic silica gel layer, the nano-cellular membrane layer comprising an inner thermoplastic polyurethane film, a polyvinyl alcohol film, a triacetate cellulose film and an outer thermoplastic polyurethane film, and a functional membrane layer plated on the surface of the nano-cellular membrane layer; wherein the nano-cellular membrane layer has a honeycomb structure. The nano-cellular membrane layer with the honeycomb structure is arranged to improve the light transmittance of the resin lens, enhance the definition and reduce the interference of stray strong light.

The embodiment of the invention relates to the field of batteries, and provides a battery monomer and a preparation method thereof, a battery device, a power utilization device and an energy storage device. The preparation method of the battery monomer comprises a process of preparing a composite diaphragm and a process of assembling the composite diaphragm, a positive electrode plate and a negative electrode plate, and the composite diaphragm comprises a first membrane layer, a porous membrane layer and a second membrane layer which are stacked, the preparation process of the composite diaphragm comprises the following steps: preparing sol containing a carbon precursor polymer, a pore inducer and a cross-linking agent into a fiber membrane; performing heat treatment on the fiber membrane to obtain a porous membrane layer; and compounding the porous membrane layer and the membrane layer to obtain the composite diaphragm. According to the embodiment of the invention, the porous carbon nanofiber membrane is introduced to one side of the base membrane, so that the purpose of promoting reversibility of lithium precipitation is achieved, and the technical effects of effectively controlling and reducing formation of lithium dendrites in the later period of battery circulation and avoiding diving and potential short-circuit risks of the performance of a battery cell are achieved.

The application relates to a pressure sensor, a pressure sensing array and a preparation method thereof. The pressure sensor comprises a first substrate, a first sensing electrode located on the upper surface of the first substrate, a first insulating layer located on the surface of the first sensing electrode and comprising a plurality of first microspheres arranged in an array or being a first hollow membrane layer, a first pressure sensitive layer located on the surface of the first insulating layer and filled into the first interspace in the first insulating layer, a second substrate located above the first substrate, a second sensing electrode located on the lower surface of the second substrate, a second insulating layer located on the surface of the second sensing electrode, the second insulating layer comprising a plurality of second microspheres arranged in an array or being a second hollow membrane layer, and a second pressure sensitive layer located on the surface of the second insulating layer and filled into the second interspace in the second insulating layer. The pressure sensor provided by the application has higher sensitivity under high pressure and thin thickness.

The invention relates to the technical field of membrane preparation, and discloses a continuous flow preparation system of a graphene composite membrane, the system comprises a base material pretreatment module, a multi-component layered compounding module, an in-situ synergistic crosslinking module, an online detection and feedback regulation and control module and a reel-to-reel winding and unwinding module which are sequentially connected in series; the multi-component layered composite module realizes uniform mixing and layered coating of graphene and functional components through a coaxial runner dispersion unit, and an ultrasonic oscillation assembly inhibits graphene agglomeration; the in-situ synergistic cross-linking module adopts plasma-ultraviolet series treatment to strengthen film interface bonding; the online detection and feedback regulation and control module is linked with the central controller through spectrum detection and thickness detection to realize real-time optimization of preparation parameters; and the reel-to-reel winding and unwinding module ensures the transmission stability of the base material. According to the invention, full-process continuous production of the graphene composite membrane is realized, the preparation efficiency, the membrane layer uniformity and the mechanical stability are improved, and the method is compatible with multi-component functional compounding and is suitable for membrane preparation in the fields of water treatment, energy storage and the like.

The invention discloses a semi-reflective semi-permeable membrane layer and an anti-dazzling automobile rearview mirror, the semi-reflective semi-permeable membrane layer comprises a high-low refractive index laminated layer and a top protective layer, the high-low refractive index laminated layer comprises a high refractive index layer and a low refractive index layer, the high refractive index layer comprises a first high refractive index layer, a second high refractive index layer, a third high refractive index layer and a fourth high refractive index layer, and the low refractive index layer comprises a third high refractive index layer and a fourth high refractive index layer. The low-refractive-index layers comprise a first low-refractive-index layer, a second low-refractive-index layer, a third low-refractive-index layer and a fourth low-refractive-index layer, and the high-refractive-index layers and the low-refractive-index layers are stacked in sequence; the top protection layer is arranged on the surface of the low refractive index layer in the high-low refractive index laminated layer and comprises an eighth high refractive index layer and an outer protection layer, and the outer protection layer is arranged on the outer surface of the top protection layer, so that the high transmittance of the rearview mirror is kept, and meanwhile, the color neutrality of transmitted light of an object can be kept.