1911 results about "Film base" patented technology

The invention relates to the technical field of image processing, in particular to a machine vision-based cover film surface defect detection method, which comprises the following steps of: firstly acquiring a cover film surface image, iteratively updating a segmentation threshold value for multiple times according to an Otsu algorithm, segmenting a scratch and a normal area by using the current threshold value in each iteration updating process, clustering pixel points of the scratch area, and obtaining a target image; a scratch segmentation coefficient is calculated according to the difference between a pixel point gray average value of each cluster and a standard gray value and the average Euclidean distance from the pixel point to the fitting curve, a current threshold segmentation effect quantized value is calculated by combining the difference between a scratch area and a normal area, and after iteration is completed, a threshold corresponding to the maximum quantized value is selected as the optimal threshold. And segmenting the image by using the optimal threshold value to determine a scratch defect detection result. According to the method, the process of calculating the segmentation threshold is optimized, the noise interference is reduced, the segmentation requirements of defects such as scratches are better met, the segmentation accuracy is improved, and the scratch defects on the surface of the cover film can be effectively identified.

Disclosed in the present invention are a PET release film base film having low surface roughness and a preparation method therefor. The release film base film comprises three layers which are stacked: a core layer and two surface layers located on both sides of the core layer. The release film base film is obtained via three-layer co-extrusion by means of taking an auxiliary extrusion resin as a raw material of the two surface layers and a primary extrusion resin as a raw material of the core layer; the auxiliary extrusion resin is obtained by mixing an anti-blocking agent PET masterbatch and a PET base material in a mass ratio of 1:5-1:15; and the primary extrusion resin is a pure PET base material. The release film base film of the present invention has low surface roughness, low haze and excellent overall performance. Since large-particle benzoic acid-modified nano aluminum oxide has the refractive index very close to that of PET base films, the present invention can effectively avoid adverse visual impacts caused by a difference in the refractive index at interfaces between nanoparticles having large particle diameters and resin matrixes, thus effectively reducing the haze.

The invention relates to an antistatic PET (Polyethylene Terephthalate) base film for preparing a polaroid release film and a preparation method thereof, the release film base film is prepared by taking an optical-grade PET slice as a main body, adding modified PET with a specific structure and a modified SiO2 filler, and carrying out co-extrusion casting, a unique three-section stretching process and coating with a coating liquid. According to the invention, material modification and process improvement are carried out, specifically, an optical-grade PET slice is taken as a main body material, modified PET and a modified SiO2 filler with a specific structure are added, a film is prepared through co-extrusion casting and a unique three-section stretching process, and then the surface of the film is coated with a layer of antistatic coating liquid, so that the antistatic film is obtained. The finally prepared base film has low alignment angle, low transverse hot shrinkage rate and high surface adhesion, keeps the characteristics of high light transmittance and low haze of an optical-grade polyester film, endows the film with certain antistatic property, and is particularly suitable for being used as a release film of a high-end polaroid.

The invention relates to a composite phase-change film based on liquid metal and PBO fiber and a preparation method thereof, and belongs to the technical field of phase-change material preparation, and the preparation method comprises the following steps: the composite phase-change film comprises a poly (p-phenylbenzobisoxazole) fiber (PBO) base material, a phase-change material and a heat-conducting filler, the phase-change material is composed of phase-change microcapsules (PM) which are prepared by taking polyurethane (PU) as a wall material and organic solid-liquid phase-change materials (OPCMs) as a core material through a Pickering emulsion polymerization method. The prepared PM has a core-shell structure, and leakage of OPCMs is effectively prevented. The PM and the PBO fiber network are combined, so that the dual packaging of the OPCMs is realized, and the leakage of the OPCMs is further prevented. Meanwhile, dispersion and interaction of the OPCMs in a PBO matrix are optimized, and formation of a network structure with a limited domain is promoted. The composite phase change film prepared by the invention has relatively high mechanical properties, remarkable heat conductivity, excellent and stable flexibility and excellent heat storage capacity.

The invention relates to an antistatic MLCC release film base film and a preparation method thereof. The antistatic MLCC release film base film is prepared by melt blending and biaxial stretching of PET master batch, an antistatic composition and a nano filler, wherein the antistatic composition is prepared by compounding modified PET-PEG and thiophene modified aromatic polyamide; the nano filler is prepared by carrying out melt extrusion on KH550 modified talcum powder and MAH-g-PET (maleic anhydride-grafted polyethylene terephthalate). The antistatic composition disclosed by the invention has the beneficial effects that the antistatic composition is formed by interweaving two polymers, and a stable three-dimensional conductive network is constructed in the PET film, so that the antistatic performance is more efficient, lasting and stable. In addition, through chemically bonded modified talcum powder, the smoothness and low roughness are provided, and meanwhile reinforcing and toughening are achieved; and the single-layer extrusion process can realize ultrathin thin film, the production process is simplified, and the production cost is greatly reduced.

The invention discloses a method and a device for detecting a watch plasma nano-film based on image processing, and the method comprises the steps: carrying out the dual-polarization light intensity data collection of the watch plasma nano-film through the photobleaching effect excitation processing and phase modulation analysis, and carrying out the detection of the dual-polarization light intensity data of the watch plasma nano-film; according to the method, a dynamic recovery feature and region segmentation technology is utilized, a point with the maximum photobleaching depth is selected as a reference datum for differential processing, accurate decoupling of a geometric curvature effect and a material effect is achieved, and therefore the intrinsic performance of the nano-film is accurately evaluated. According to the technical scheme, the problem of nonlinear interference caused by a watch curved surface can be effectively solved, and a reliable nano-film quality detection result is provided.

The invention relates to the technical field of graphene, and discloses a deep skin anti-wrinkle beauty instrument applying a graphene electrothermal effect and a control method, the method comprises the following steps: pre-activating a graphene electrothermal film to obtain a negative temperature coefficient resistance characteristic parameter; performing contact state detection and multi-parameter analysis on the target area to obtain personalized temperature control parameters; pWM sectional power control is carried out on the graphene electrothermal film based on the personalized temperature control parameters and the negative temperature coefficient resistance characteristic parameters, and a staged heating temperature output strategy is obtained; real-time feedback adjustment is carried out based on a staged heating temperature output strategy, and a stable temperature control signal is obtained; the graphene electrothermal film is subjected to gradual cooling power adjustment according to the stable temperature control signal, meanwhile, the safe stop state of the beauty instrument is confirmed, the unique characteristic that the resistance value is reduced when the temperature of the graphene material rises is utilized, and compared with a traditional linear resistance material, the temperature control precision and the response speed are higher.

The invention relates to the technical field of light guide film light intensity distribution regulation and control methods based on microstructure optimization, discloses a light guide film light intensity distribution regulation and control method and system based on microstructure optimization, and aims at solving the problems that an existing light guide film is fixed in light intensity distribution, insufficient in optimization precision and difficult to customize. The method comprises the following steps: constructing a light guide film model and a target light intensity distribution diagram, initializing microstructure parameters and simulating to obtain simulated light intensity distribution; deviation is calculated and serves as optimization algorithm input, and microstructure parameters are iteratively adjusted through a particle swarm optimization algorithm based on gradient guidance until convergence is met; and converting the optimized microstructure parameters into a manufacturing instruction. Through the scheme, reverse high-precision customization of light intensity distribution of the light guide film can be realized, the design efficiency, the light energy utilization rate and uniformity are remarkably improved, and the research and development period is shortened.

The invention relates to the technical field of polypropylene capacitance films and preparation methods thereof, in particular to a high-temperature-resistant polypropylene capacitance film and a preparation method thereof.The preparation method comprises the steps that a base film sheet comprising a first edge layer, a second edge layer and a heat-resistant layer is prepared through a three-layer co-extrusion extruder, and the heat-resistant layer is located between the first edge layer and the second edge layer; stretching the base film sheet to form a capacitance film base film; and plating a metal film on the surface of the capacitance film base film to obtain the capacitance film. According to the high-temperature-resistant polypropylene capacitor film prepared by the method, the heat-resistant layer can fundamentally improve the high-temperature-resistant performance of the base film of the capacitor film, so that the overall high-temperature-resistant performance of the capacitor film is improved, and the production is simple. Besides, metal ions and ash content are not introduced, the breakdown voltage of the capacitor film product is not reduced, the first edge layer and the second edge layer do not influence the processing performance of the high-temperature-resistant polypropylene capacitor film and the control of the surface roughness, and the subsequent process is not influenced.

The invention discloses a preparation method of an acid-resistant polyquaternary ammonium membrane based on a Porxitch interfacial polymerization reaction. The preparation method comprises the following steps: dissolving an amine monomer in a water-phase solvent to form a water-phase solution; dissolving a bromomethyl monomer in an organic phase solvent to form an organic phase solution; after the base membrane is soaked in the water phase solution for a period of time, the water phase solution is removed, and the water phase solution remaining on the surface of the base membrane is removed; coating the organic phase solution on the surface of a base membrane, and carrying out interfacial polymerization reaction for 1-15 minutes at the high temperature of 50-90 DEG C, so as to prepare a polyquaternary ammonium membrane on the base membrane; and washing the surface of the polyquaternary ammonium membrane with an organic solvent to remove residual reactants, and then carrying out heat treatment in a drying oven to obtain the acid-resistant polyquaternary ammonium membrane.

The invention discloses a straw paper mulching film based on thermo-mechanical pulp as well as a green preparation method and application of the straw paper mulching film. The invention belongs to the field of biomass resource utilization. Aiming at the defects in the prior art, the invention provides a green preparation method of a straw paper mulching film based on thermo-mechanical pulp. According to the method, the staged hydrothermal grinding technology is adopted, washing is not needed, the acidic paper pulp is directly obtained, and the technological process is simplified. Meanwhile, the invention innovatively develops a green sizing agent taking chitosan as a main material. The sizing agent can be directly fused with acidic paper pulp, and acid and alkali do not need to be additionally added for adjusting the pH value. The dry tensile index of the straw paper mulching film is larger than or equal to 15 N.m / g, the wet tensile index is larger than or equal to 5 N.m / g, the burst index is larger than or equal to 3.5 kPa.m < 2 > / g, the contact angle is larger than or equal to 105 degrees, and the 2-hour water absorption rate is smaller than or equal to 50%.

The invention discloses an imaging film based on a Fresnel lens micro image-text array structure, and the film is characterized in that the film comprises a transparent film substrate; the composite structure micro-focusing element array layer is arranged on one surface of the transparent film substrate and comprises a plurality of composite structure micro-focusing element units, and each composite structure micro-focusing element unit is obtained by performing Fresnel lens on a micro image-text array, so that a Fresnel lens micro image-text array structure is formed; an ultraviolet adhesive layer is arranged between the adjacent composite structure micro focusing element units, and the ultraviolet adhesive layer is higher than the Fresnel lens micro image-text array structure; and the reflecting film layer covers the surface of the Fresnel lens micro image-text array structure. The imaging thin film is large in visual angle and thin in thickness, the Fresnel micro lens array and the micro image-text array form a composite structure, the technological process is optimized, the production cost is reduced, and a thin film type imaging device with ultra-thin and flexible characteristics can be achieved.

The invention belongs to the field of conductive films, and discloses a preparation method of a conductive film based on PEDOT: PSS and silver nanowires, and the preparation method specifically comprises the following steps: after carrying out surface hydroxylation treatment on the silver nanowires AgNWs, under the action of a silane coupling agent 3-(trimethoxymethylsilyl) propyl methacrylate TMSPMA, mixing the silver nanowires AgNWs with PEDOT: PSS to prepare a PEDOT: PSS / AgNWs base solution; the preparation method comprises the following steps: adjusting the pH value of a base solution to be nearly neutral through sodium citrate, then mixing the base solution with a PEA emulsion, carrying out spin coating to form a film, and finally, carrying out ultrafast laser treatment to improve the conductivity so as to obtain the conductive film based on PEDOT: PSS and silver nanowires. The conductive film provided by the invention has high conductivity (gt; 1200 S / cm), good stability and excellent mechanical properties, and is suitable for a flexible electronic device and stable work in a certain humidity environment.

The invention relates to the technical field of filter film testing, and discloses filter film thermal deformation testing equipment and a testing method. The method comprises the following steps: based on a test environment, carrying out a temperature cycle test on the filter film, and collecting a triple data set at the same time; performing image preprocessing and displacement field construction on the triple data set, and decomposing a displacement field into a linear combination of a standard deformation mode to obtain a thermal deformation response function; constructing a hierarchical probability graph model based on a thermal deformation response function, and extracting thermal deformation feature structural representation through variational inference; and performing deviation compensation on the structural representation of the thermal deformation characteristics to obtain environment self-adaptive thermal deformation characteristics, and calculating a thermal deformation reliability evaluation result comprising a thermal expansion coefficient matrix, a thermal deformation anisotropy index and thermal ripple strength. And comprehensive evaluation and reliability analysis of the thermal deformation characteristic of the filter film are realized.

The invention discloses a method for detecting thickness uniformity of a P layer of an EPE adhesive film based on particle swarm optimization, and particularly relates to the field of EPE adhesive film detection.The method comprises the steps that an optical interference detection system is built, and the optical interference detection system comprises a laser light source, an optical splitter, an interference detector and a data acquisition module; an EPE adhesive film sample is placed in a measurement area of an optical interference detection system, then light path parameters of a laser light source and an optical splitter are adjusted, interference images at different positions are captured through an interference detector, and the interference images comprise fringe displacement, fringe spacing and fringe intensity distribution and are used for reflecting change information of the thickness of a P layer of the EPE adhesive film. Through combination of optical interference detection and a particle swarm optimization algorithm, an adhesive film P layer thickness distribution model is established, the model integrates information of fringe displacement, fringe spacing and fringe intensity distribution, and the comprehensiveness of thickness uniformity detection is relatively improved, so that the detection requirement of thickness change in reality is met.

The invention relates to a method for regulating and controlling crystallization of a perovskite thin film based on surface laser annealing and a preparation method of a perovskite photovoltaic module, and the surface laser annealing comprises the steps: constructing an infrared temperature measurement system in annealing equipment to monitor the surface temperature of the perovskite thin film in real time, and carrying out the closed-loop control of the output power of a surface laser; in annealing equipment, a preheating stage and a main annealing stage are executed through a surface laser, and optionally, a post-processing stage can be further added to prepare the perovskite thin film. Compared with the traditional heating stage annealing and line scanning laser annealing process, the method has the advantages that surface laser annealing is more uniform, local instantaneous heating is realized through high-energy dense surface laser within millisecond-second time, a solvent can be rapidly evaporated through rapid temperature rise, synchronous crystallization of a perovskite precursor is promoted, an independent precipitation time window of PbI2 is reduced, and the yield of PbI2 is improved. Therefore, the performance of the device is improved, and the high-efficiency perovskite solar cell module can be prepared.

The invention provides an ultra-wideband low-absorption low-stress high-reflection thin film based on a gradual change chirp structure, and belongs to the technical field of optical thin films. Different from a mode of mutually combining and superposing high and low refractive index materials of a traditional structured film system to control the reflection bandwidth, the invention provides a logarithmic function gradient chirp structure, the reflectivity index is adjusted by adjusting the total number of film layers, and the reflection bandwidth is adjusted by adjusting head and tail optical thickness coefficients. The problem that the reflectivity is suddenly reduced in a multi-reflection-band superposition reflection gap area when the broadband high-reflection dielectric film is designed is effectively avoided, and the problem of surface distortion caused by thin film stress is reduced by adjusting the film thickness ratio of the stress regulation and control layer to the gradual change main reflection layer. From the perspective of membrane system design, the thickness of the membrane layer is reduced, the preparation period and difficulty are reduced, problems and risks caused by stress are reduced, membrane layer absorption is effectively reduced, and the absorption and stress can be controlled within a proper range in combination with a post-treatment means to effectively support safe and stable operation of the system.

The invention discloses a fluoride-free waterproof sound-transmitting film and a preparation method thereof, and the fluoride-free waterproof sound-transmitting film comprises the following components in percentage by mass: 30-40% of a fluoride-free polymer; 4.5%-11.5% of a fluoride-free waterproof agent; 0.5%-3.5% of a cross-linking agent and 45%-65% of a solvent; the solvent is a mixed solvent of N 'N-dimethylformamide, N' N-dimethylacetamide, acetone and ethyl acetate, and the mass ratio of the amide solvent in the mixed solvent is 60%-85%; the preparation method of the fluoride-free waterproof sound-transmitting film comprises the following steps: preparing a spinning solution; carrying out electrostatic spinning by utilizing electrostatic spinning equipment to obtain a continuous and uniform nano spinning membrane; the method comprises the following steps: uniformly depositing nanofibers on a nano spinning film base material, and carrying out post-treatment to obtain a finished product of the fluoride-free waterproof sound-transmitting film, the fluorine-free safe and healthy product with good water resistance and air permeability, high rebound resilience and excellent acoustic performance is successfully prepared through selection of raw materials, preparation of a spinning solution, spinning process parameters and fine regulation and control of post-treatment conditions.

The invention discloses a coated reflecting film based on an organic fluorescent coating and a preparation method of the coated reflecting film, tetra (4-aminophenyl) methane and tetra-(4-formyl-(1, 1-biphenyl)) ethylene are used as reaction monomers to prepare a novel topological structure [4 + 4] COF (3D-TPE-COF) with a tetraphenylethylene (TPE) unit, and the novel topological structure [4 + 4] COF (3D-TPE-COF) is used for preparing the reflective film based on the organic fluorescent coating. The covalent organic framework material 3D-TPE-COF is added into coating liquid as a fluorescent material to prepare a coating reflecting film based on an organic fluorescent coating, and the obtained reflecting film can convert high-energy blue light, so that the brightness of light emitted by a backlight module is higher and closer to white; meanwhile, the 3D-TPE-COF fluorescent material and the polymer particles can form hydrogen bonds in the coating liquid to avoid aggregation of the polymer particles, so that the wear resistance and scratch resistance of the coating reflecting film are improved.

The invention discloses a high-air-permeability humidity display film based on optical interference and a preparation process of the high-air-permeability humidity display film. Comprising a substrate layer, a humidity response layer, a middle layer and a hydrophobic layer, wherein the substrate layer is made of a transparent material; a plurality of breathable micropores are formed in the substrate layer; the humidity response layer is a thin film layer which is made of a humidity sensitive material and has the thickness of 50-100 [mu] m, micropores are formed in the humidity response layer, and the pore diameter of the micropores is 0.5-2 [mu] m; the middle layer is a nanofiber membrane, and the fiber diameter of nanofiber is controlled to be 100-300 nm; the density of the middle layers in the length direction is in gradient change so as to control the air permeability of the humidity response layers corresponding to the middle layers with different densities; the hydrophobic layer is made of a transparent and breathable material and provides a good protection effect for the humidity display film. According to the invention, the hydrophilic microporous structure material is adopted, the humidity can be rapidly conducted to the humidity response layer through the multilayer design, instant color change is generated, and the humidity indication effect is more sensitive.

The invention relates to the technical field of transmission membranes, in particular to a transmission membrane based on dithienylethene and a preparation method of the transmission membrane. The transmission film comprises a base film and light-operated molecules, the base film is coated with the light-operated molecules, and the light-operated molecules have light response groups. A detection result shows that after ultraviolet irradiation, the transmission film can quickly realize complete conversion from an open loop to a closed loop; after visible light irradiation is recovered, the transmission film can efficiently and reversibly recover to an open-loop state. In addition, the transport membrane has a high on-off ratio to five ions of sodium, potassium, lithium, magnesium and calcium. The transmission membrane based on dithienylethene, which is prepared by taking terminal amino-modified dithienylethene as a basic unit, not only has abundant nano-channels, but also is endowed with the characteristic of regulating and controlling the opening and closing of the nano-pore by a photoresponse functional group, and the closing and opening of an ion channel can be accurately regulated and controlled through the alternate irradiation of ultraviolet light and visible light, so that the transmission membrane has a good application prospect. And the controllability of light-operated ion transmission is finally realized.

The present invention proposes a light-absorbing film and a preparation method and application thereof, including a preparation method of a copper-vanadium-sulfur / copper-vanadium-selenium / copper-vanadium-sulfur-selenium light-absorbing film based on a solution method, and an application of the light-absorbing film prepared by the method on a solar cell. The preparation method is simple to operate and low in cost. Thioglycolic acid and ethanolamine are used as ligands, and ethylene glycol methyl ether is used as a solvent to adjust the viscosity to prepare a precursor solution; a copper-vanadium-sulfur / copper-vanadium-selenium / copper-vanadium-sulfur-selenium film is prepared by spin coating-sintering mode and adjusting the feed ratio of elements; high-temperature heat treatment is continued for sulfurization / selenization reaction to obtain a large-grain through-type copper-vanadium-sulfur / copper-vanadium-selenium / copper-vanadium-sulfur-selenium film, which can avoid the generation of impurities in the film, and the prepared light-absorbing film is applied to the light-absorbing layer of a solar cell, which is conducive to assembling a copper-vanadium-sulfur-selenium thin film solar cell with high photoelectric conversion efficiency.

The invention discloses a preparation method of a tungsten ditelluride film based on a temporary Van der Waals buffer layer. The method comprises the following steps: growing a WTe2 thin film by adopting a low-temperature co-deposition method, annealing to form a Bi2Te3 / WTe2 vertical heterojunction, continuously raising the temperature, annealing to gradually decompose a Bi2Te3 buffer layer until the Bi2Te3 buffer layer disappears, and finally forming the high-quality WTe2 thin film on a substrate. The Bi2Te3 film serves as a temporary buffer layer to provide an atomic-scale flat surface for WTe2 growth, and compared with a WTe2 film directly grown on a substrate, the method has the advantages that the quality is excellent, the coverage degree is high and continuous, the thickness is uniform, the orientation is ordered, and no stress exists, so that the method has obvious advantages when the Bi2Te3 is used as the buffer layer to grow the WTe2 film. The method can be popularized to growth of a thin film material which is poor in quality and grows on a buffer layer directly, and favorable conditions are created for high-quality preparation and large-scale application of the thin film.

The invention discloses a gradient membrane based on continuous distribution of PVDF-HFP-silicon dioxide electronic injection microspheres and a construction method of the gradient membrane, and belongs to the field of gradient membranes, an improved electrostatic spinning and electrostatic spraying technology is utilized, a PVDF-HFP fiber membrane is prepared through the electrostatic spinning technology, PVDF-HFP / SiO2 composite microspheres are electrostatically sprayed, and a collector receiving device is combined, so that the gradient membrane is obtained. The traction speed change of the substrate film is controlled on the blade electrode, and a wettability gradient film with the continuously-changed surface appearance is constructed; on the surface of the prepared fiber membrane, the distribution form of the polyvinylidene fluoride-hexafluoropropylene / silicon dioxide composite microspheres on the surface of the membrane is in gradient change, a microstructure with continuous change is constructed, the contact angle of the fiber membrane is increased from 128 degrees to 153 degrees along with the change of the surface position, and a gradient surface gradually changing from hydrophobicity to super-hydrophobicity is obtained. And the preparation method has an excellent application prospect in the field of gradient films, bubble transmission and bubble micro-reaction.

The invention discloses an MLCC release film base film and a preparation method thereof, and relates to the technical field of release films, the MLCC release film base film comprises a core layer and a functional coating layer arranged on the outer surface of the core layer; the core layer is prepared from the following raw materials: PET (Polyethylene Terephthalate) resin, functional polyester containing triazolyl tetrafluorophenyl, a coupling agent, reinforced fibers, an antioxidant and a lubricant; the functional coating layer is prepared from the following components: hydroxyl-terminated hyperbranched polyester, isocyano ethyl methacrylate, vinyl trimethoxy silane, nano filler, 3, 3 '-diamino-4, 4'-difluorodiphenyl sulfone, 2, 2 '-bis (trifluoromethyl) diaminobiphenyl, a photoinitiator, a catalyst A and a diluent. The base film is low in surface roughness and warping degree, good in high temperature resistance, high in flatness and appropriate in stiffness.

The invention provides a light conversion adhesive film for sunlight wavelength conversion and application thereof, the light conversion adhesive film comprises an organic compound # imgabs0 # and a substrate transparent to visible light, the definition of each group in the organic compound is described in the specification, and the mass fraction of the organic compound in the light conversion adhesive film is 0.01%-5%. The light conversion adhesive film can be used for a solar cell so as to enhance the efficiency and the stability of the cell.

The invention discloses a fano resonance-based color radiation refrigeration film and a preparation method thereof, the film comprises a structure M1D1M2D1AD 'which are sequentially stacked from bottom to top, the structure of the film is an asymmetric structure, M1 represents a first metal layer, M2 represents a second metal layer, A represents an absorption layer, D1 represents a first dielectric layer, and D' represents a symmetrical dielectric layer unit of a film material; the M1D1M2 structure is in a discrete state and serves as a narrow-band light absorber, the M2D1AD'structure is in a continuous state and serves as a broadband light absorber, D 'serves as an antireflection layer in a continuous state, and the narrow-band light absorber and the broadband light absorber are coupled by sharing the second metal layer M2 to achieve fano resonance. The high-purity and color-adjustable reflection type structural color is achieved, the high reflectivity is achieved in the solar spectrum wave band, the high emissivity is achieved in the atmosphere window, and therefore the excellent radiation refrigeration effect is achieved.

The invention relates to the technical field of film production control, and discloses a synchronous two-way stretch film production control method and system based on process optimization. The method comprises the following steps: carrying out real-time acquisition and subspace identification on BOPA film production line process parameters, and establishing a state space prediction model; performing multi-objective weighted combination on quality indexes and energy consumption based on the model to form a performance optimization function; setting a process constraint boundary, and constructing a quadratic programming constraint set; and carrying out rolling optimization by applying a gradient projection algorithm, calculating an optimal control sequence and executing the first control instruction. According to the method, the problem of quality fluctuation caused by insufficient adaptive capacity of the model in the BOPA film production process is solved.

The invention relates to the technical field of soft robots, in particular to a carbon nanosheet-based photo-thermal response thin film driver and a preparation method and application thereof. The preparation method of the carbon nanosheet-based photo-thermal response thin film driver comprises the following steps: adding a UCST type monomer, a cross-linking agent and a photoinitiator into water, and dissolving to obtain a solution A; adding an LCST type monomer, a cross-linking agent and a photoinitiator into the solution of the carbon nanosheets to obtain a solution B; coating one surface of a thin film with the solution A, and curing; and coating the solution B on the other surface of the thin film, and curing to obtain the carbon nanosheet-based photo-thermal response thin film driver. A biomass raw material used for preparing the carbon nanosheet is coconut water. The method is simple in preparation process, mild and controllable in reaction condition and easy to popularize; the size of the carbon nanosheet-based photo-thermal response thin film driver can reach the micron level, the driving process can be accurately controlled, fine elements can be prepared, and the carbon nanosheet-based photo-thermal response thin film driver is high in photo-thermal response sensitivity, high in heating and cooling speed, short in photo-thermal response and recovery time and repeatable.

The invention provides a packaging adhesive film for a perovskite assembly and a photovoltaic assembly and application thereof. The adhesive film comprises organic ammonium salt and a packaging adhesive film base material, wherein the organic ammonium salt is selected from one or more of diammonium halogen ammonium salt, phenyl halogen ammonium salt and thiophene halogen ammonium salt. According to the invention, the organic ammonium salt is used as the passivation material and is combined with the adhesive film matrix material to prepare the packaging adhesive film, so that the process step of post-passivation of the perovskite assembly and corresponding expensive vacuum equipment can be omitted, and the packaging cost is greatly reduced while the service life of the perovskite assembly is prolonged.