18 results about "Fluoran" patented technology

The present application relates to a kind of fluorane compound, thermosensitive dye dispersion and its preparation method, the fluorane compound has the structure shown in formula I, wherein, R is selected from 4-trifluoromethylphenyl, n-hexyl, aminomethyl, -CH2CH2OH, -CH2CH2Br, -CH2OCH3 Or one of esterified PEO groups.The fluorane compound of the present application can be used as thermosensitive dye, and the 1,2,3-triazole structure can enhance the color ability of fluoran mother nucleus.

The present invention provides a reversible thermochromic composition which exhibits black color upon coloration and colorless color upon discoloration, and has excellent light resistance, by using a fluoran derivative having a specific structure as an electron-donating chromogenic organic compound, and a reversible thermochromic microcapsule pigment containing the reversible thermochromic composition. The means for solving the problem is a reversible thermochromic composition comprising: (a) a fluoran derivative having a specific structure as an electron-donating chromogenic organic compound, (b) a compound having a specific structure as an electron-accepting compound, and (c) a reaction medium which allows the electron transfer reaction between the (a) component and the (b) component to occur reversibly in a specific temperature range, and a reversible thermochromic microcapsule pigment containing the reversible thermochromic composition.

The present application relates to a kind of fluorine-containing fluorane compound, light-resistant thermosensitive dye and preparation method and application, belong to fine chemical technology field, solve the problem of insufficient light resistance of existing thermosensitive dye heat-sensitive material.The fluorane compound of the present application contains fluorine in molecular structure.Preparation method includes the following steps: step 1: 2-(2-hydroxy-4-diethylaminobenzoyl) benzoic acid, 3,5-bistrifluoromethylphenol and mixed strong acid are added to reaction vessel, condensation reaction occurs;Step 2: cooling, organic solvent is added to the reaction system, then slowly add alkaline solution, heating reflux stirring, ring-closing reaction occurs, to obtain reaction liquid;Step 3: the reaction liquid is separated, to obtain organic phase, water washing to neutral, separation, collect the organic phase of neutral, remove organic solvent by distillation under reduced pressure, dry, to obtain fluorine-containing fluorane compound solid.

The present invention discloses the preparation and application of a light-resistant fluoran-type color-changing dye, belonging to the field of fine chemical technology. The present invention optimizes the structure of commercial fluoran dyes to provide a method for preparing a full-color spectrum fluoran dye with excellent light resistance. While maintaining the color development, color change sensitivity, and color change fatigue resistance of the dye, the light resistance is improved, with the light resistance time increased by 8-28 hours, an increase of 50%-80%. This solves the main problem of the application of such temperature-sensitive materials in the field of functional textiles, expands the application field, and is beneficial to economic benefits.

The present invention discloses a method for preparing a highly sensitive, reversible thermochromic fluoran dye and a compound thereof, belonging to the fields of fine chemicals and materials science. The present invention designs a series of novel fluoran dyes and develops two-component reversible thermochromic dyes and microcapsules prepared based on these novel fluoran dyes. The resulting two-component reversible thermochromic dyes and microcapsules can achieve thermochromism without the addition of bisphenol A. Compared to traditional three-component color-changing systems, this avoids the effects of bisphenol A's oxidative properties on the color-changing system. While optimizing the cost structure, this achieves improved reversible thermochromic performance, promoting the application of thermochromic systems in high-precision, high-value-added fields.

The invention provides an electrochromic material, a preparation method of an electrochromic device and the electrochromic device.The electrochromic material comprises a solvent, a black dye, an ionic conductive agent, electrogenerated alkali-producing molecules, a plasticizer, a high-molecular polymer and electrogenerated acid-producing molecules; the situation that the black fluorane dye moves to other film layers in the color changing process of the electrochromic device, and consequently the subsequent color changing reaction cannot be conducted can be prevented, and therefore the cycling stability of the electrochromic device can be improved.

The application discloses application of a fluorane-based discoloring dye in improving material light resistance, and belongs to the technical field of fine chemical industry.The application provides a series of fluorane-based discoloring dyes containing different electron-withdrawing groups, and the series of discoloring dyes has good light resistance performance.Therefore, the application mainly designs a fluorane dye containing electron-withdrawing substituents, that is, on the basis of an existing fluorane dye parent structure, electron-withdrawing groups such as nitro, fluorine, chlorine, bromine and iodine are introduced, the electron-withdrawing performance of the electron-withdrawing groups is utilized, the electron cloud distribution state of the dye molecular structure is changed, and the light resistance performance is improved.

The present application relates to the technical field of pigment material, and particularly relates to a water-caused fading pigment block and application thereof. The pigment block is in a solid block structure, and is prepared from leuco dye, anhydrous calcium sulfate, organic weak acid, water-soluble binder, humectant, dispersant, preservative, pH regulator and deionized water, wherein the leuco dye is a fluoran dye with a lactone ring closed structure, and the anhydrous calcium sulfate is used as an inorganic forming skeleton material. By controlling the component ratio and particle size range, the forming property of the pigment slurry and the system stability are considered. The pigment block can be coated on the surface of a water-impermeable substrate by kneading or externally applying oxalic acid aqueous solution, and can be removed by water wiping or washing. The pigment block has stable structure, simple preparation process, is suitable for use in a block form, and meets the requirements of repeated writing or coating and water washing removal.

This invention provides an electrochromic material, an electrochromic composition, and an electrochromic device, relating to the field of chemical materials technology. The electrochromic material contains electrochemically active viologen units. These viologen units are reduced under a negative voltage, increasing their charge density and causing fluoranes with different substituents to undergo ring-closure reactions. The different colors exhibited by the fluoranes with different substituents in the electrochromic material change to a colorless state within 35 ms under a negative voltage of -1.8V. The viologen unit itself has a large standard electron transfer rate constant on the electrode surface. Connecting it to the fluorane moiety further enables rapid electron transfer to the fluorane moiety, ensuring a fast color change. The electrochemically active viologen unit itself has excellent redox cycle stability, thus ensuring the excellent cycle stability of the overall electrochromic material. After 1000 cycles, the absorbance change decreases by less than 10%.

A highly marketable reversibly thermochromic composition that provides a black color during color development by using a fluoran derivative having a specific structure as an electron-donating color-developing organic compound, turns colorless during decoloration, and is excellent in contrast between a colored state and a decolored state and a microcapsule pigment encapsulating the same. A reversibly thermochromic composition including: (a) a fluoran derivative having a specific structure as an electron-donating color-developing organic compound; (b) an electron-accepting compound; and (c) a reaction medium which reversibly induces an electron transfer reaction between the component (a) and the component (b) in a specific temperature range, and a reversibly thermochromic microcapsule pigment encapsulating the same.

The application discloses a gel color developing patch for indicating VOCs in a sickroom based on photocatalysis and a preparation method thereof. The gel color developing patch comprises, in percentage by mass, 1.4-2.0% of graphite phase carbon nitride g-C3N4, 0.2-1.0% of fluoran dye, 5.0-7.0% of polyvinyl alcohol (PVA) and 90.0-93.4% of distilled water. The polyvinyl alcohol is dissolved in deionized water to obtain a PVA solution; a nanometer flake aqueous solution of graphite phase carbon nitride g-C3N4 and the fluoran dye are added into the PVA solution, and the mixture is stirred at room temperature until uniform, to obtain a reaction liquid; the reaction liquid is transferred into a glass container and sealed, and is repeatedly frozen and thawed for multiple times, to obtain the gel color developing patch. The gel color developing patch is used for visual detection of VOCs in air in a sickroom of a hospital, and is helpful for monitoring emission of VOCs in a hospital room and finding a pollution source.

A highly marketable reversibly thermochromic composition that provides a black color during color development by using a fluoran derivative having a specific structure as an electron-donating color-developing organic compound, turns colorless during decoloration, and is excellent in contrast between a colored state and a decolored state and a microcapsule pigment encapsulating the same. A reversibly thermochromic composition including: (a) a fluoran derivative having a specific structure as an electron-donating color-developing organic compound; (b) an electron-accepting compound; and (c) a reaction medium which reversibly induces an electron transfer reaction between the component (a) and the component (b) in a specific temperature range, and a reversibly thermochromic microcapsule pigment encapsulating the same.

The application discloses a thermochromic dye and a preparation and application thereof, and belongs to the technical field of fine chemical industry. The application firstly introduces amino groups into a fluoran dye structure by using the reaction between a lactone and an alkyl diamine with the fluoran dye as raw material; and then, the aldehyde amine reaction between the amino fluoran dye and phenolic hydroxyl benzaldehyde is utilized to prepare a lactam thermochromic dye. The application utilizes the characteristics that the phenolic hydroxyl in the structure of the thermochromic dye releases protons at low temperature and obtains protons at high temperature, and utilizes the flexibility of the alkyl chain in the structure of the alkyl diamine, so that the ring-opening and ring-closing reactions of the lactam structure in the fluoran dye structure are caused, the size of the conjugated system of the dye is adjusted, and the color change of the dye is realized.

The invention belongs to the technical field of wood composite materials, and particularly relates to a polyurea color-changing agent microcapsule and a preparation method thereof, a formaldehyde-free compound adhesive, a reversible thermochromic formaldehyde-free recombined decorative veneer and a preparation method thereof. The preparation method comprises the following steps: mixing a water-soluble emulsifier with water to obtain a water phase; a compound color changing agent and a diisocyanate compound are mixed, an oil phase is obtained, and the compound color changing agent comprises thermosensitive fluorane dye, a color developing agent and an organic solvent; emulsifying the water phase and the oil phase to obtain an emulsion; and carrying out polymerization reaction on the low-activity polyamine compound and the high-activity polyamine compound and the emulsion to obtain the polyurea color-changing agent microcapsule. According to the color-changing agent, the microcapsules and the polymer are cross-linked, so that the interface bonding force and the dispersion stability are improved, the stability and the weather resistance of the color-changing agent are remarkably improved, and meanwhile, the damage to the microcapsules during high-pressure gluing of the recombined decorative material is reduced. According to the recombined decorative veneer, the thermochromic function is achieved, the decoration performance of the recombined decorative veneer is improved, intelligence and interactivity are improved, and zero addition of formaldehyde is achieved.

The present invention aims to disclose an orange thermal colorant and a preparation method thereof. The orange thermal colorant is 3-dibutylamino-7-ethoxyacylfluoran. Compared with the prior art, the reaction raw materials are readily available, the production process is simple, and the product is stable. Not only can orange thermal paper, film, and thermal color-forming materials be produced, but also thermal color-forming materials of any color can be produced by color matching, thereby achieving the purpose of the present invention.

The invention relates to the technical field of chemical engineering, in particular to an N, N-dihexyl-3-methoxyaniline pure product, a preparation method and application. According to the method, in a polar aprotic solvent, inorganic base is used as a catalyst, 3-methoxyaniline and alkyl halide are catalyzed to perform alkylation reaction to obtain a product, and then the product is purified; the polar aprotic solvent is one or more of N, N-dimethyl formamide, dimethyl sulfoxide, N-methyl pyrrolidone or acetonitrile; the inorganic base is one or more of carbonate or hydroxide; the alkyl halide is one or more of alkyl bromide, alkyl chloride or alkyl iodide. The method has the advantages of mild reaction conditions, good selectivity and few byproducts; a green and economic process route suitable for large-scale production is provided for efficient synthesis of the N, N-dihexyl-3-methoxyaniline, and a technical support is provided for industrialization of the high-color-density fluorane dye.

The invention relates to a light-resistant thermosensitive dye dispersion liquid as well as a preparation method and application thereof, belongs to the technical field of fine chemical engineering, and solves the problem that a thermosensitive material of the existing thermosensitive dye is insufficient in light resistance. The thermosensitive dye dispersion liquid is prepared from the following raw materials in parts by weight: 8 to 12 parts of fluorine-containing fluorane compounds, 1 to 5 parts of PVA-205 and 15 to 25 parts of deionized water, the fluorine-containing fluorane compound has a structure as shown in a formula I,

The present invention aims to disclose a green thermal colorant and a preparation method thereof. The green thermal colorant is 3-dibutylamino-7-dibenzylfluoran. Compared with the prior art, the reaction raw materials are readily available, the production process is simple, and the product is stable. Not only can green thermal paper, film, and thermal color-forming materials be produced, but also thermal color-forming materials of any color can be produced by color matching, thereby achieving the purpose of the present invention.