80 results about "Photochromism" patented technology

This invention discloses a method for preparing and intelligently identifying microscopic stealth codes by integrating artificial intelligence and hyperspectral imaging, belonging to the field of anti-counterfeiting technology. The method comprises two parts: preparation and identification. During preparation, photochromic materials are doped into a substrate to form microscopic code points. A hyperspectral feature library is established, and a digital twin initial model containing partial differential equations is constructed, followed by pre-training of a physical information neural network. During identification, measured hyperspectral data of the code points to be tested are collected. Combined with environmental parameters and historical data, the expected state is predicted using the trained physical information neural network. The authenticity is determined by comparing the measured data with the expected state. This invention embeds physical laws into the identification process through a digital twin model and a physical information neural network, achieving proactive prediction of the evolution of the microscopic stealth code state, significantly improving the accuracy, robustness, and anti-counterfeiting capability of anti-counterfeiting identification.

This invention discloses a polishing method and apparatus for nickel-based alloys based on photocatalysis and photothickening synergy. It achieves dual-driven processing by simultaneously triggering photocatalytic workpiece surface modification and photo-triggered thickening of the polishing slurry through an integrated dual-light system, realizing surface softening and medium thickening. Composite abrasive particles loaded with TiO2 / ZnO photocatalysts form a low-hardness oxide layer on the nickel-based alloy surface under ultraviolet light irradiation, reducing processing resistance. Precise viscosity control of the polishing slurry is achieved through azobenzene / cinnamic acid photochromic molecules, combined with shear-induced particle agglomeration to form a dual thickening system, improving viscosity stability. This invention solves the technical pain points of work hardening in nickel-based alloys, large viscosity fluctuations in traditional shear-thickening polishing slurries, and poor processing uniformity, improving processing efficiency and workpiece surface quality. It is suitable for efficient and precise machining of difficult-to-machine nickel-based alloys such as Inconel 718 and GH4169.

This application relates to the technical field of reactive dyes, specifically to a photochromic red fluorine-containing reactive dye, its preparation method, and its application. The general structural formula of this photochromic red fluorine-containing reactive dye is as follows: [Formula omitted for brevity]. Wherein, R1 and R2 are -H, -SO3M, -CH3, -COOM, -NO2, or -NHCONH; R3 is -Cl or -SO3M; and M is Na, K, or Li. The reactive dye provided in this application exhibits good wash fastness, rubbing fastness, chlorine fastness, and good solubility on cotton fabrics, while also possessing excellent light fastness and superior fixation rate on cotton fabrics during medium-temperature dyeing.

Photochromic polyimide material and preparation method, coating, coating, optical device and application; photochromic polyimide material, by introducing photochromic unit into polyimide structure, the material can quickly respond and present color change under ultraviolet light irradiation, and restore to colorless state by visible light or heating; and the polyimide matrix provides high mechanical strength, thermal stability and chemical resistance, so that the material maintains stable color changing ability in multiple light-color changing cycles. At the same time, the weather resistance of the material is greatly improved, which can adapt to outdoor and harsh environment, and expands the application prospect of the material in the fields of intelligent coating, optical device, sensor and the like, thereby solving the problem that the existing photochromic material cannot simultaneously have photoresponsivity, mechanical performance, chemical stability and weather resistance.

This invention relates to photochromic compounds represented by the following general formula 1, in which Az represents an unsubstituted or substituent monovalent azazine cyclogroup, L represents a divalent or higher linking group, D represents a photochromic pigment structure, a and c each independently represent an integer of 1 or more, and b represents an integer of 0 or 1 or more. When general formula 1 contains multiple Az groups, the multiple Az groups may be the same or different; similarly, when general formula 1 contains multiple L groups, the multiple L groups may be the same or different.

One aspect of the invention relates to a method for producing a plastic article or semi-finished product from a polymerizable mixture of isocyanates and isocyanate-reactive components, wherein the mixture comprises at least one photochromic dye, at least one surface additive, an isocyanate component and at least one of the following components: - a poly(thio)urethane prepolymer produced from isocyanates and isocyanate-reactive components, wherein the ratio of the two components is such that there is an excess of isocyanate-reactive groups in relation to isocyanate groups; - a poly(thio)urethane prepolymer produced from isocyanates and isocyanate-reactive components, wherein the ratio of the two components is such that there is an excess of isocyanate groups in relation to isocyanate-reactive groups; - a thiol component; wherein the mixture contains at least one photobase generator, a photochromic dye and a surface additive. Further aspects of the invention relate to a plastic article or a plastic article provided with an additional layer, each produced by a method according to another aspect of the invention, as well as a polymerisable mixture.

The invention relates to an ophthalmic article (1), in particular for sunglasses, comprising at least one substrate (9) and a photochromic filter compound (15), the ophthalmic article (1) having a first transmission spectrum in an activated state of the photochromic filter compound (15) and a second transmission spectrum in a deactivated state of the photochromic filter compound, such that: ⋅—the first and the second transmission spectra at wavelengths lower than 380 nm is lower than 1%, ⋅—the first and the second transmission spectra have a relative first maximum between 460 nm and 510 nm, ⋅—the first and the second transmission spectrum have a relative first minimum between 560 nm and 610 nm, and where ⋅—Tvactivated is the luminous transmittance according to ISO_13666 in the activated state of the photochromic filter compound. ⋅—Tvdeactivated is the luminous transmittance according to ISO_13666 in the deactivated state of the photochromic filter compound. ⋅The lens has a reduced transmission in the blue between 400 and 450 nm and a reduced transmission around 585 nm. The lens provides a good contrast and reduces glare.TvdeactivatedTvactivated>2.5TvactivatedTνdeactivated

Provided is a photochromic compound represented by General Formula 1. In General Formula 1, R30 and R31 each independently represent a linear or branched alkyl group having 2 or more carbon atoms, which is unsubstituted or has one or more substituents; a cyclic alkyl group having 3 or more carbon atoms which is unsubstituted or has one or more substituents; or represents a group represented by - (R100)nR101 which is unsubstituted or has one or more substituents, R100 represents an alkyleneoxy group, R101 represents an alkyl group, n represents an integer of 1 or more, a total number of carbon atoms of n alkyleneoxy groups represented by R100 and alkyl groups represented by R101 is 2 or more, R32 to R35 each independently represent a hydrogen atom or a substituent other than an electron-attracting group, and R36, R37, B7 and B8 each independently represent a hydrogen atom or a substituent.

This disclosure relates to a light-resistant flexible multilayer material comprising: a layer containing a polymer matrix and an organic material, wherein the organic material is impregnated with iron oxide; and a transparent cover layer, wherein the cover layer is a paint, a polymer layer, or a combination thereof; wherein the layers are bonded to each other. Furthermore, articles comprising the above-described light-resistant flexible multilayer material are disclosed, as well as the use of iron oxide as a photochromic protectant for organic materials, wherein the iron oxide is impregnated in the organic material.

The application discloses a photochromic plush fabric and a preparation method thereof, and belongs to the technical field of functional textile materials. The photochromic plush fabric is formed by warp knitting or knitting processing of a photochromic plush fiber with a skin-core structure; the fiber comprises a polyester skin layer accounting for 60-80% in mass and a photochromic core layer accounting for 20-40% in mass; the core layer is composed of 5-15% photochromic microcapsules, 70-85% linear low-density polyethylene carrier resin and 5-10% additives. Through skin-core composite melt spinning and low-temperature color fixing process, the application solves five big bottlenecks of uneven discoloration, hand feeling deterioration, poor washing resistance, low safety and difficult mass production of traditional photochromic plush fabrics. The obtained fabric can quickly and uniformly develop color under ultraviolet light in 1-3s, and can reversibly fade in 5-12s; the hand feeling is fluffy and soft; the discoloration intensity retention rate is greater than or equal to 85% after 50 times of washing, and meets the A-class standard of GB18401-2010. The preparation process is simple, mass production is strong, and the application can be widely applied to the fields of toys, clothes, home furnishing and automobile interior decoration.

The application provides a double-rare earth doped photoelectric storage film and a preparation method and application thereof, and the method comprises the following steps: (1) pressing Eu2O3 and Tb4O7 into sheet structures respectively, obtaining Eu2O3 target material and Tb4O7 target material after high-temperature calcination; and placing the Eu2O3 target material and the Tb4O7 target material on a KNN target material to simultaneously perform radio frequency sputtering, and obtaining a photoelectric storage film. The photoelectric storage film of the double-rare earth doped potassium sodium niobate prepared by the application has high transparency, full-waveband fluorescent reading, good stability and bending resistance, and can realize coupling between photochromism and dielectric energy storage in the film material, thereby providing a new opportunity for the application requirement of constructing a future flexible foldable photoelectric storage device.

This invention discloses a Schiff base photo-switching material, its preparation method, photochromic material, and its application in three-dimensional imaging. The Schiff base photo-switching material is a compound having the chemical structure shown in general formula (1) or general formula (2): Formula (1) In formula (1), X is a methoxy group; R1 is selected from aromatic hydrocarbon groups or alkyl groups; Formula (2) In formula (2), R2 is a 4-methoxystyryl group; R1 is selected from aromatic hydrocarbon groups. The Schiff base photo-switching material according to this invention can be applied to three-dimensional imaging and has high brightness and high contrast.

This invention discloses a composite layer and its application, relating to the technical field of marine engineering protective materials. A composite layer includes, from top to bottom, a photochromic stealth layer, an interface coupling layer, and a toughened and blast-resistant layer. The photochromic stealth layer comprises a polymer matrix and photosensitive liquid crystal microcapsules embedded in the polymer matrix. The photosensitive liquid crystal microcapsules are filled with an azobenzene-based liquid crystal material, and a conductive layer is disposed on the surface of the photosensitive liquid crystal microcapsules. The interface coupling layer includes, from bottom to top, a flexible layer, a transition layer, and a rigid layer. The shear-toughened and blast-resistant layer comprises an epoxy resin matrix, a biomimetic neural bundle network embedded in the epoxy resin matrix, and a shear-thickening liquid. The composite layer of this invention possesses excellent optical stealth performance, impact resistance, and environmental adaptability, making it suitable for dynamic camouflage and impact protection of deep-sea equipment, underwater vehicles, and marine engineering structures.

This invention discloses a α This invention describes a photoresponsive dynamic molecular crystal of cyanodiaryl hydrocarbons, its preparation method, and its application in the preparation of photochromic display materials and photoresponsive information storage devices. The technical solution of this invention is based on electronic structure effects and supramolecular interactions, and is applicable to fluorinated... α The introduction of pyridine substituents into cyanodiaromatic derivatives stabilizes parallel π-stacking dimers. At the same time, the electron-deficient properties of pyridine can reduce the charge density of the aromatic ring, weaken the intermolecular repulsion, and enhance the coulombic attraction. Through intramolecular charge transfer and hydrogen bonding to lock the molecular conformation, axisymmetric photocycloaddition reactions are achieved, accompanied by photomechanical response and tunable luminescence properties.

The application discloses an aldehyde-containing photochromic merocyanine compound and a preparation method and application thereof, and the preparation method comprises the following steps: dissolving 2-hydroxy-5-methyl-m-xylylformaldehyde in an organic solvent, adding drop by drop an organic solvent containing an indolium alkyl sulfonate compound in an inert atmosphere, refluxing reaction, and purifying the reaction solution through post-treatment to obtain the aldehyde-containing photochromic merocyanine compound; through protection of the inert atmosphere and control of the dropping sequence of the reactants, generation of reaction by-products is reduced, and the aldehyde-containing photochromic merocyanine compound with fat solubility and water solubility is synthesized.

The application relates to the functional coating technical field and discloses a glass reflection heat insulation paint, which comprises A component and B component; the A component comprises, in mass percentage, 45.0%-55.0% of solvent type hydroxyl acrylic resin, 5.0%-8.0% of hexagonal system nanometer cesium tungsten bronze powder, 1.0%-2.5% of anchoring type high molecular super dispersant, 0.2%-0.6% of cerium isooctoate, 0.8%-1.5% of bis (1-octyloxy-2, 2, 6, 6-tetramethyl-4-piperidyl) sebacate, 0.1%-0.3% of a leveling agent and the rest of mixed solvents; and the B component is aliphatic hexamethylene diisocyanate trimer. The application effectively inhibits the photochromic phenomenon of the coating and does not interfere with the crosslinking and curing. In combination with a step-by-step in-situ modification preparation process, competition of metal ions for coordination is avoided, secondary agglomeration of the powder is prevented, and the visible light transmission ratio of the paint film and the heat storage stability of the paint are improved.

This invention discloses a photochromic thin film with multiple photoresponses, its preparation method, and its applications, belonging to the field of organic functional materials technology. The raw materials for the photochromic thin film with multiple photoresponses include: a photosensitive monomer, a photoacid monomer, and Dow Corning DC 184; the structural formula of the photosensitive monomer is [insert structural formula here]; wherein, R... 1 ~R 7 Each is independently selected from one of -H, -CH3, -CF3, -CCl3, -CBr3, -N(Me)2, -CN, -OMe, R 8 Selected from -(CH2) n CH=CH2、-(CH2OCH2) n CH=CH2、-(CH2) n One of OCOC(CH3)=CH2, where n is 1~5. This invention provides a photochromic thin film with multiple photoresponses, which can achieve multi-dimensional information storage by controlling the light wavelength and irradiation time, significantly improving information storage capacity and encryption complexity.

The present invention relates to a projection device (6) for the interior space (1) of a vehicle, the projection device having: a first layer (7) made of at least one photochromic dye that forms a projection surface (8); a projector (10) by means of which at least electromagnetic radiation (11) having at least one wavelength in the inclusive range from 380 nanometers to 780 nanometers can be provided and the electromagnetic radiation can be radiated onto the projection surface (8) such that a reversible color change of the dye can be caused by the electromagnetic radiation (11) radiated onto the projection surface (8); a light source (12) arranged on a first side (S1) of the first layer (7) facing away from the projection surface (8) by means of which at least ultraviolet light for canceling the color change can be provided and the ultraviolet light can be radiated towards the first layer (7).

The application discloses a photochromic multi-component copolyester, a photochromic biodegradable polyester film and preparation and application thereof. The copolyester comprises a first repeating unit shown in formula (I) and a second repeating unit shown in formula (II); the molar ratio of the first repeating unit to the second repeating unit is (5-95):(95-5). The application introduces a diaryethene photochromic structural unit and a polylactone segment into a polyester molecular main chain, can synthesize a block or random copolymer as required, cooperatively gives the polyester intrinsic photochromic characteristics and biodegradability, and can precisely control the mechanical properties and degradation rate of the material. The application also provides a photochromic biodegradable polyester film prepared from the polyester, the film has adjustable mechanical properties, fast and stable light response, excellent film-forming property, can realize reversible photochromism and controllable degradation.

The present application relates to the technical field of textile materials, in particular to a photochromic curtain fabric and a preparation method thereof. The present application overcomes the problems of unstable discoloration performance and poor durability of the curtain fabric. The present application synthesizes modified polyimide through copolymerization and imidization reaction; the photochromic microcapsules, composite dispersing agent and other components are two-stage melt blended with the modified polyimide to obtain a mixture containing polyimide; then the surface of the polyimide fiber is modified through spinning forming and surface modification; finally, the photochromic curtain fabric is obtained through dip coating, curing and weaving processes. The mechanical properties and discoloration stability of the fabric are enhanced by modifying the polyimide; the aging resistance of the fabric is improved by the synergistic effect of the other components, thereby meeting the functional and durable requirements of the textile material.

The application provides a preparation method of photo / electro dual-modulation variable color fabric, which comprises the following steps: carrying out surface decontamination treatment on the fabric, drying the fabric for standby, preparing a sodium tungstate solution, adding oxalic acid, adding hydrochloric acid to adjust the pH value, stirring, then adding rare earth elements, continuously stirring in a light-shielded environment to obtain a mixed solution, putting the fabric and the mixed solution into a reaction kettle, taking out the fabric after hydrothermal reaction, cleaning and drying the fabric, and obtaining the photo / electro dual-modulation variable color fabric. The application adopts a hydrothermal method to synthesize variable color materials on the surface of the fabric, so that a film with photochromic and electrochromic capabilities is formed on the surface of the fabric, tungsten trioxide is used as a main electrochromic material, and the photochromic and electrochromic dual-modulation performance of the variable color fabric is realized by doping rare earth elements Nd and Eu. The variable color fabric prepared by the application has good flexibility and stable photo / electro dual-modulation performance, the flexible substrate makes the variable color fabric have potential wearable performance, and the variable color fabric can be used for future smart clothes and implantable display applications.

This invention relates to a temperature monitoring material with photochromic properties, its preparation, and its application, belonging to the interdisciplinary field of temperature monitoring and sensing technology. The chemical formula of this dosimeter material is CaF2:xNa. + The material is first uniformly ground manually or mechanically, then dried by baking or air drying, and finally pressed into a preform. After sintering, a temperature monitoring material with photochromic properties is obtained. The prepared product exhibits excellent performance in terms of tissue equivalence, temperature response speed, cost control, and portability. It has a temperature response range of 50-200℃, and the temperature information can be intuitively read through visually perceptible color changes, making it suitable for large-scale preparation and a wide range of applications.

Photochromic polyamide materials, their precursors, preparation methods, photoinitiators, and applications are disclosed. The precursors for photochromic materials are described, which are used to prepare photochromic polyamide materials. This process involves mixing the precursor with multifunctional hydrocarbon groups or their derivatives to obtain the photochromic material. Specific functional hydrocarbon groups can be selected for mixing to enhance the performance of the photochromic material. By introducing photochromic units into the polyamide structure, the material can quickly respond to ultraviolet light and return to a colorless state, maintaining excellent photochromic effects. Simultaneously, the polyamide matrix significantly enhances the material's mechanical strength, wear resistance, and environmental adaptability, giving it long-term stable color-changing properties. This makes it suitable for various fields such as smart coatings and optical devices. This solution addresses the technical problems of existing naphthol-pyran-based photochromic materials in terms of photoresponse, mechanical properties, and chemical stability.

Photochromic polyurethane material and preparation method thereof, photoinitiator, paint, coating, optical device and application; the photochromic polyurethane material introduces photochromic structural units into the polyurethane material, through optimizing molecular design, the material can quickly respond and discolor under ultraviolet light irradiation, and quickly restores to the colorless state under visible light or heating conditions; in addition, the polyurethane matrix enhances the mechanical strength and chemical stability of the material, so that it has better durability in various application environments, solving the problem that the photochromic performance, mechanical performance, weather resistance and thermal stability of the existing material cannot be simultaneously compatible.

The application discloses a multifunctional transparent display and dark color dimming composite film and a preparation method thereof, and belongs to the technical field of dimming films. The multifunctional transparent display and dark color dimming composite film comprises, from top to bottom, an upper layer of conductive base material, a dark color dimming composite layer, a photochromic layer and a lower layer of conductive base material which are sequentially stacked. The preparation method of the composite film comprises the following steps: 1) preparing a dark color dimming composite layer slurry and a photochromic layer slurry; 2) assembling the dimming film; and 3) post-processing. In the application, the photochromic spirooxazine unit is in the form of a secondary ammonium salt, and is assembled with a supramolecular polymer matrix with a side chain hanging calabash [6] urea, and a dynamic and reversible non-covalent bond cross-linking and molecular inclusion protection mechanism is used, so that the key technical bottlenecks of traditional photochromic materials in the aspects of cycle stability, single function and processing compatibility are successfully solved, and the construction of a high-performance, multiple-stimulus-response intelligent material is realized.

The present application provides a reversible photochromic paper bowl and its preparation method and application, the reversible photochromic paper bowl includes paper bowl base material, isolation layer, photochromic layer and protective layer arranged in turn; the isolation layer includes a combination of polyvinyl alcohol and cationic guar gum; the photochromic layer includes a combination of a first aqueous polymer matrix and photochromic microcapsules; the protective layer includes a combination of a second aqueous polymer matrix and nanometer titanium dioxide. Through the design of the isolation layer, the photochromic layer, the protective layer and their joint action, the reversible photochromic paper bowl has light response color changing characteristics, and the response speed is fast, and the color changing performance is reversible. At the same time, the reversible photochromic paper bowl has uniform and stable color development and color change effect, excellent ultraviolet aging resistance, high modulus, strength and rigidity, excellent mechanical properties, acoustic properties, sensitivity and sound quality effect, and its preparation method is simple, which can meet the diversified performance requirements in various scenes.

The application discloses a display panel, a display device and a control method thereof. The display panel comprises a first light-emitting unit, a second light-emitting unit and a photochromic layer. The first light-emitting unit is located in a first pixel opening of a pixel definition layer, and the second light-emitting unit is located in a second pixel opening of the pixel definition layer. The photochromic layer is located on a side of the pixel definition layer away from a substrate. In a direction perpendicular to a plane where the substrate is located, the photochromic layer overlaps the pixel definition layer and the first light-emitting unit, and does not overlap the second light-emitting unit. The display panel comprises a first working mode and a second working mode. In the first working mode, the first light-emitting unit emits light, the photochromic layer is opaque, and part of light emitted by the second light-emitting unit is blocked by the photochromic layer. In the second working mode, the first light-emitting unit does not emit light, and the photochromic layer is a light-transmitting film layer. The display viewing angle of the first working mode is smaller than that of the second working mode. The application can realize active anti-peeping.