109results about How to "Obvious discoloration" patented technology

A tooth whitening system comprising a tooth whitening composition comprising a whitening agent and a hydrophobic polymer carrier. The tooth whitening composition is preferably substantially non-water soluble. The tooth whitening composition is applied to the surface of a tooth to be whitened in a mammal to effect whitening on the tooth surface. Methods of whitening a surface of a tooth are also provided.

The compound thereof is ferrocenyl replacing rhodmine-6G. Said compound can be used to detect the mercury ion in highly selectivity; when the mercury concentration is lower than 2ppb, it also can be detected by the invention; other ions such as Pb2+,Ag+,Fe2+,Zn2+,Cd2+,Mn2+,Co2+,Ni2+ and Cu2+ have no interference.

The invention provides a microcapsule. The microcapsule is of a double-layered structure. The material of an inner capsule wall is polyurethane resin. The material of an outer capsule wall is urea resin. A fluorescent pigment and an epoxy reparation agent are wrapped in the capsule walls. The microcapsule created by the invention has good compatibility with an epoxy matrix. The microcapsule is fractured under the effect of external stress to release reparation monomers for reparation, and meanwhile, the positions and conditions of damage occurring parts can be hinted through colour changes.

The invention provides a curcumin-carried pH-response color-changing antibacterial fiber and a preparation method thereof. The preparation method comprises the following steps: step 1, drying and dewatering polyacrylonitrile powder, and filtering for separating by utilizing a screen mesh; step 2, mixing curcumin, the polyacrylonitrile powder obtained in the step 1 and a solvent, wherein the mass concentration of the polyacrylonitrile is 18-22%, and the consumption of the curcumin is 0.5-5% of the polyacrylonitrile powder in dry weight; and step 3, stirring a mixed liquid obtained in the step 2 to puff and dissolve polyacrylonitrile to obtain a spinning solution, performing deaeration on the spinning solution, performing wet spinning to obtain a nascent fiber, performing drying densification on the obtained nascent fiber, and performing heat setting treatment, so as to obtain the curcumin-carried pH-response color-changing antibacterial fiber. According to the curcumin-carried pH-response color-changing antibacterial fiber and the preparation method thereof, the fiber is colored uniformly, the color fastness is excellent, and the fiber has the weaving mechanical property and the pH-response color-changing performance; the spinning temperature is low, and the medicine activity of curcumin can be still retained, so that the fiber has the anti-bacterial function.

The invention relates to an azobenzene-contained microcapsule-type liquid crystal and application thereof in light-controlled liquid-crystal falsification-resistant ink. According to the invention, the microcapsule-type liquid crystal uses azobenzene-contained liquid-crystal unit as a core material and polyurea as a wall material, wherein the core material and the wall material are connected together through polysiloxane; and the light-controlled liquid-crystal falsification-resistant ink is composed of the following substances by weight: 20 to 25 parts of the above-mentioned azobenzene-contained microcapsule-type liquid crystal, 25 to 30 parts of a polyurethane binder, 25 to 28 parts of isopropanol, 26 to 38 propyl, 0.8 to 1.2 parts of a dispersant and 0.8 to 1.2 parts of polyethylene wax. The light-controlled liquid-crystal falsification-resistant ink prepared by using the azobenzene-contained microcapsule-type liquid crystal as a raw material in the invention has good storage stability; and the printing products of the ink have significant metachromatism under the irradiation of 330 to 380 nm of ultraviolet light, so identification is easy and use is convenient.

The invention discloses a preparation method for a surface-coated magnesium fluoride laser aluminum powder optically-variable pigment, and relates to a preparation method for a surface-coated magnesium fluoride laser aluminum powder. The preparation method comprises the following steps: plating magnesium fluoride, aluminium and magnesium fluoride on the surface of a plastic film sequentially through a vacuum coating method to obtain a three-layer composite coating; performing laser mould pressing on the composite coating at a high temperature to generate a laser colorful effect; pulverizing the laser composite coating through the laser cutting technology to obtain laser sheet powder, mixing and heating the obtained laser sheet powder with an organic solvent to enable the coating layer to be separated from plastic, carrying out hydrocyclone separation to obtain a laser plating slurry, adding a surface treating agent, drying and classifying to obtain the surface-coated magnesium fluoride laser aluminum powder. Paint (printing ink) prepared by the powder has no appearance color change dead angle, and is obvious in color change effect, and bright in color; the average grain size of the powder (d50) is 10-50 microns, the thickness is 70-140 nm, the solid content is equal to or larger than 99%, and the powder is free of organic solvents, stable during storage, and convenient to store and transport.

The invention discloses ultraviolet chromatic paired engraving gravure ink, relates to ink for anti-counterfeiting printing, and aims to provide ultraviolet fluorescent ink suitable for gravure. The ink comprises the following components in percentage by weight: 15 to 25 percent of ultraviolet fluorescent powder, 10 to 15 percent of alkyd resin oil, 20 to 25 percent of phenolic resin oil of high acid value, 8 to 10 percent of pure phenolic resin oil, 15 to 20 percent of transparent calcium carbonate, 5 to 7 percent of surfactant, 6 to 8 percent of polyethylene wax, 2 to 4 percent of mineral oil, and 0.3 to 0.5 percent of drying agent. The anti-counterfeiting patterns printed by the gravure ink have the anti-counterfeiting characteristics of gravure hand feel, fine patterns, micro characters and the like of engraving gravure printing, have peculiar ultraviolet chromatic effect, have strong popular anti-counterfeiting function, are difficult to fabricate and easy to popularly identify, can improve the popular anti-counterfeiting function of valuable papers such as money and the like, and are suitable for anti-counterfeiting printing of various valuable papers, licenses and marks.

The invention discloses high-temperature segment multi-color irreversible temperature indicating paint. The high-temperature segment multi-color irreversible temperature indicating paint is prepared from the following components in percentage by weight: 5 to 20 parts of a color development substance, 20 to 40 parts of a high-temperature physical filler, 30 to 50 parts of high temperature resistantsilicone resin, 10 to 30 parts of a solvent A and 20 to 40 parts of a solvent B. The high-temperature segment multi-color irreversible temperature indicating paint disclosed by the invention is formed by mixing the color development substance, the high-temperature physical filler, the solvent A and the solvent B according to specific proportions, and has remarkably-obvious color change point, good temperature measuring property, measurable temperature of 800 to 1200 DEG C and measurement temperature range of about 50 to 100 DEG C; and by matched combination use, the measurement temperature range can be further narrowed and can reach 30 DEG C at minimum. The high-temperature segment multi-color irreversible temperature indicating paint disclosed by the invention is convenient to produce, simple and convenient in process and simple in process; and the high-temperature segment multi-color irreversible temperature indicating paint is suitable for measuring the surface temperatures of a continuous operation machine part and a complex structural part, or can measure temperature distribution of large-area surface of an object and also can simultaneously measure the temperatures of element parts.

The invention belongs to the field of environment pollution detection and wastewater treatment and discloses calcium alginate / 5-Cl-PADAB microspheres and a preparation method and application thereof. The preparation method includes: by EDC / sulfo-NHS, an amino containing indicator 5-Cl-PADAB is grafted to sodium alginate to obtain a 5-Cl-PADAB grafted sodium alginate precipitation product; dissolving the product and sodium alginate into deionized water, and then dripping into a crosslinking agent solution to obtain yellow calcium alginate / 5-Cl-PADAB microspheres. The microspheres have the advantage that a metal ion detection performance is improved on the basis that an alginic acid adsorption performance is not reduced obviously. In addition, the preparation method is simple, mild in reaction condition, easy to operate, low cost and easy in acquisition of sodium alginate materials, environment friendly and suitable for industrial application.

Present Invention discloses high efficiency selected development compound fluorine ion detection method and test paper based on identifying naked eye visual investigation combination. Said compound use 2, 4-binitro phenylhydrazones-4, 5-dihetero fluorenone ligand coordination as characteristic coordination compound, said compound selectivity detection to fluorine ion in 10-5concentration range, capable of using absorption photometry and naked eye visual colorimetry to detect. Discoloration test paper made from compound can detect fluorine ion concentration low to 1 ppm. Said inventive test paper has simple making, convenient detect, visual, in favor of habitualness detect of fluorine content in drinking water.

The invention provides multifunctional fiber with a pH discoloration property, an antibacterial property and a drug-releasing property and a preparation method thereof. The preparation method is characterized by comprising the following steps: polyacrylonitrile powder is dried and dehydrated, and then is filtered and separated by a filter screen; curcumin, vitamin E, the polyacrylonitrile powder obtained by separation in the step 1 and a solvent are mixed; the obtained mixed liquid is stirred so that polyacrylonitrile is expanded; polyacrylonitrile is heated to be dissolved to obtain a spinning solution; the obtained spinning solution is subjected to de-foaming and wet spinning; and the obtained nascent fiber is subjected to drying densification and heat setting treatment, thus obtaining the multifunctional fiber with pH discoloration property, antibacterial property and drug-releasing property. With the method provided by the invention, the prepared fiber has the advantages of even coloring and excellent color fastness. The fiber has the weaving mechanical property and has the pH response discoloration property. Because of a low spinning temperature, drug activities of curcumin and vitamin E can be maintained, so that the fiber also has antibacterial and drug sustained-release functions.

The invention relates to a triphenylamine containing isoindigo polymer, a preparation method of the triphenylamine containing isoindigo polymer, and an application of the triphenylamine containing isoindigo polymer to electrochromism, and relates to an isoindigo polymer and a preparation method and an application of the isoindigo polymer. The invention aims at solving the problem of relatively narrow application range of isoindigo caused by the low solubleness of the isoindigo in an organic solvent. The structural formula of the triphenylamine containing isoindigo polymer is shown in the description, wherein n in the formula is a positive integer. The preparation method is as follows: 1, synthesizing N<1>,N<1>-bi(4-bromobenzene group)-N<4>,N<4>-diphenylbenzene-1,4-diamine monomer; 2, preparing an isoindigo derivative; 3, preparing the triphenylamine containing isoindigo polymer. The invention discloses the application of the triphenylamine containing isoindigo polymer to electrochromism as an electrochromic layer in an electrochromic device. The polymer has the electrochromic property and the memory property, can be applied to the electrochromism field, and is excellent in explosive detection and photoelectric detection. The triphenylamine containing isoindigo polymer is suitable for preparing the isoindigo polymer and the application of the isoindigo polymer.

The invention relates to detection test paper for the content of micro-water in aviation fuel and a preparation method of the detection test paper. The detection test paper comprises filter paper and a detection composition, wherein the surface of the filter paper is uniformly coated with the detection composition; the detection composition comprises a first component and a second component; the first component is selected from cyanate and / or thiocyanate; and the second component comprises one or more metal ions of Fe<2+>, Fe<3+>, Cu<2+>, Cu<+> and Co<2+>. The preparation method comprises the following steps: uniformly mixing the first component and the second component, and coating the surface of the white filter paper with the mixture, thus obtaining the detection test paper. The detection test paper provided by the invention is changed in color in water; the obviousness of the color change has a corresponding relation with a water content range at 5 to 50 ppm; at a water content critical point of 30 ppm, the color changes obviously; at a low free water content, such as 10 ppm, developing can be realized sensitively, and the detection test paper is convenient to use; and moreover, the preparation method is simple, low in cost and long in storage period.

The invention relates to application of a bistable photochromic material in ink, bistable photochromic ink and a preparation method thereof. The bistable photochromic ink consists of the following components in parts by weight: 1-10 parts of the bistable photochromic material, 1-25 parts of extender pigment, 20-55 parts of connection material and 3-45 parts of additive. According to the invention, the problem that the photochromic state of the existing ink disappears along with the light source is solved, and the colorless bistable photochromic ink with a good anti-fake effect is provided.

The invention discloses a carbazolyl-containing isoindigo polymer and its preparation method and application in electrochromism and relates to an isoindigo polymer and a preparation method and application thereof. The carbazolyl-containing isoindigo polymer solves the problem that the low solubility of isoindigo in an organic solvent causes a narrow isoindigo application range. The carbazolyl-containing isoindigo polymer has a structural formula shown in the description. In the formula, n represents a positive integer. The preparation method comprises: 1, synthesizing an N-(4-(9H-carbazolyl-9-yl)phenyl)-4-bromo-N-(4-bromophenyl)aniline monomer, 2, preparing isoindigo derivatives, and 3, preparing the carbazolyl-containing isoindigo polymer. The carbazolyl-containing isoindigo polymer is used as an electrochromic layer in an electrochromic device for electrochromism. The polymer has excellent electrochromic properties and memory properties, can be applied to the field of electrochromism, and has excellent performances in explosive detection and photodetection. The invention provides the preparation method and application of the isoindigo polymer.

The invention belongs to the technical field of electrochromic materials, and discloses an electrochromic material and an electrochromic device based on dynamic metal-ligand complexation. The electrochromic material is formed by mixing metal ions, the electrochromic material and an electrolyte, the electrochromic device is designed based on the dynamic metal-ligand complexation, and the structureof the electrochromic device is divided into a liquid electrochromic device structure and a solid electrochromic device structure. The liquid electrochromic device structurally comprises a first electrode, an electrochromic medium and a second electrode. The solid electrochromic device structurally comprises a first electrode, an electrochromic medium, an ion exchange membrane, an auxiliary mediumand a second electrode. The electrochromic material and the electrochromic device realize adjustable full-visible spectrum and high contrast, and have the advantages of high coloring efficiency, quick electrochromic response, excellent cycle reversibility, ultralow cost and simple preparation process.

The invention discloses a triphenylamine benzothiadiazole polymer containing a biphenyl structure as well as a preparation method and an application thereof. The triphenylamine benzothiadiazole polymer aims to solve the problems of low solubility and poor heat resistance of small organic molecule compounds in organic solvents in the existing photoelectric field. The preparation method comprises the following steps: firstly, taking 4-(9H-carbazole-9-yl) aniline, N', N'-bis(4-(tert-butyl) phenyl) benzene-1, 4-diamine and 4-amino triphenylamine monomers as raw materials, and carrying out a substitution reaction on the raw materials and p-bromoiodobenzidine to generate triphenylamine monomers containing biphenyl structures; the benzothiadiazole derivative is prepared by the following steps: substituting two bromides on 4, 7-dibromo-2, 1, 3-benzothiadiazole with tributyltin chloride to form a reaction active site, and reacting the reaction active site with a triphenylamine monomer containing a biphenyl structure to generate the polymer. The triphenylamine benzothiadiazole polymer is easily soluble in polar solvents and good in thermal stability, and is applied to the field of multifunctional materials.

The invention relates to a mechanochromic polyurethane elastomer material as well as a preparation method and application thereof, and belongs to the technical field of mechanochemical conduction materials. The mechanochromic polyurethane elastomer material provided by the invention contains a repeating unit with a specific structure. Tests show that the color of the mechanochromic polyurethane elastomer material is changed from colorless to red after being stressed, the color of polyurethane can be recovered to a colorless state before being stressed after the mechanochromic polyurethane elastomer material is stood at room temperature for 15 minutes, and the color change performance is not obviously reduced after the mechanochromic polyurethane elastomer material is repeatedly used for five times. Meanwhile, the material has good anti-interference performance, and the color change performance of the material cannot be affected by stimulation of ultraviolet rays, temperature and the like, so that the mechanochromic polyurethane material has good performance and is expected to be applied to the fields of intelligent clothing and the like.

A high-solid dark-yellow fastness decoration finish paint special for engineering machinery is prepared from the raw materials by weight: 30-32% of dark chrome yellow, 0.8-1% of nanometer barium sulfate, 57-61.6% of 70% acrylic resin, 0.1-0.2% of ultraviolet absorber, 0.5-0.8% of hindered amine antioxidant, 1-1.5% of barium cadmium zinc compound stabilizer, 1-1.5% of triphenyl phosphite, 4-5% of diluent, 0.5% of dispersing agent and 0.5% of film formation auxiliary agent. The raw materials are stirred, dispersed and the like, and then filtered and packaged when viscosity achieves a standard. The high-solid dark-yellow fastness decoration finish paint has the following advantages that the technique of drying thermoplastic acrylic resin by volatilization to form a film is adopted, the ultraviolet absorber and the hindered amine antioxidant are used, the barium cadmium zinc compound stabilizer and the triphenyl phosphite antioxidant are matched for the first time in the paint industry, and simultaneously, a certain amount of nanometer barium sulfate is added, so that the problems that bright colors such as dark yellow are apt to change, aging performance exists and the like when the decoration finish paint is used outdoors are solved, and simultaneously the cost is substantially lowered.

The invention relates to a photochromic water-based ink for textiles, and a preparation method and an application thereof. The photochromic water-based ink is prepared from a weather-proof photochromic microcapsule powder, an adhesive, a cross-linking agent, a dispersing agent, a wax emulsion, a leveling agent, a film-forming agent, a penetrating agent, a pH regulator, an antifoaming agent, an antioxidant, a preservative, a thickener and deionized water. The photochromic water-based ink for textiles makes up the defects of a commercially available photochromic oily system, realizes zero TVOC emission, meets the requirements of ecological environmental protection, makes up the defects of a commercially available photochromic aqueous system, and has the characteristics of uniform dispersion,long storage time, good stability, excellent washability, high drying speed and good processing continuity.

The invention discloses a preparation method of acid and base test paper. The preparation method comprises the following steps of collecting viola tricolor L petals, cutting the petals into small pieces with scissors, putting the small pieces into a mortar to be finely ground to release the juice as far as possible, and adding ethanol to dissolve the juice to form viola tricolor L leachate; carrying out rotary evaporation on the roughly prepared leachate; accurately determining the color change interval of the indicator by using a PH sensor and an acid-base titration method. The viola tricolor L acid-base indicator prepared by the method can turn red in case of acid and turn green in case of base, and has the advantages of obviousness in color change and stability.

The present invention provides a microorganism activity detection method for constructed wetland sewage treatment system, comprising the following basic steps of constructed wetland microorganism sampling, cultivation, extraction, measurement and calculation. The present invention adopts iodine nitro group tetrazolium as an electron acceptor, cancels oxygen removal step on the basis of the strongelectron affinity of INT, adopts 2h as the cultivation time, and uses ethanol as extractant to extract INTF inside microorganism cells. The detection method has the advantages that: the INT is strongin electron affinity and the ability of competing with oxygen for electrons; the present invention can be used to detect the electron transport system activity of aerobic, anaerobic and denitrification nitrogen removal microorganisms in constructed wetland systems, finishes extraction process under the condition of normal temperature, and avoids incomplete extraction, extractant evaporation and other problems which are caused by high temperature; the microorganism dry weight direct determination method is combined with the detection process of microorganism electron transport activity, thereby avoiding errors caused by different matrixes and plant rhizosphere biomass as well as uneven sampling.

The invention relates to a method for measuring content of vitamin C in Fructus lycii, in particular to a method for quickly measuring content of vitamin C in Fructus lycii, and aims to solve the technical problem that decoloring or oxidizing needs to be performed on sample liquid and the technical problems of need for preparing many drugs, large instrument-equipment investment, complex operation and high time consumption. The method includes: 1, preparing a to-be-measured sample; 2, performing acid-base neutralization titration; 3, titrating for a blank test; 4, calculating content of vitamin C in Fructus lycii. The method has the advantages that decoloring or oxidizing does not need to be performed on colored sample liquid to be measured, the method has the advantages of small investment, low reagent consumption, simple operation, high stability and wide application range and is suitable for quickly measuring content of vitamin C in Fructus lycii, and the measuring range can be conveniently adjusted by increasing filtrate sampling amount or increasing sample liquid diluting ratio. The method is applied to measuring content of vitamin C in Fructus lycii.

The invention discloses a photochromic PVB film as well as a preparation method and application thereof. The photochromic PVB film comprises PVB resin, a plasticizer, an antioxidant, a WO3 / TiO2 composite material and an auxiliary agent, wherein the auxiliary agent comprises at least one of an ultraviolet absorbent, a coupling agent and a binding power regulator. The photochromic PVB film can be applied to preparation of photochromic glass. The photochromic PVB film disclosed by the invention has the advantages of high discoloration reaction rate, strong ageing resistance, long discoloration duration, good thermal stability and the like, and compared with photochromism of an organic material, the inorganic photochromic material PVB film can effectively avoid the problems of low reaction rate, easiness in ageing, short discoloration duration, poor thermal stability and the like.

The invention discloses an elastic nylon composite material for 3D printing and a preparation method thereof. The elastic nylon composite material is prepared from, by weight, 45-50 parts of nylon 12, 15-25 parts of glass fiber, 15-25 parts of a compatibilizer, 25-35 parts of a toughening agent, 0.6-1.2 parts of an antioxidant, 0.3-0.6 part of a lubricant, 0.5-1.0 part of a nucleating agent and 0.2-0.4 part of a light stabilizer; the preparation method comprises the steps that the raw materials are weighed according to the proportion, the dried nylon 12 and the auxiliaries are put into a mixer to be mixed for 8-10 minutes, then discharging is conducted, and a mixture is obtained; then extrusion granulation is conducted through a twin-screw extruder, and the product is obtained. The elastic nylon composite material has the flexibility and resilience of rubber, the comprehensive mechanical strength is high, the bending resistance is excellent, the cost is low, the preparation process is simple, and the material is suitable for industrial production and capable of being applied to 3D printing, and has good application prospects.

The invention discloses a nucleotide sequence and amino acid sequence of a lipase with fat degrading capability under acidic condition after modification, and is used for overcoming the defects that the enzyme activity rapidly decreases and the practicability is poor when the lipase is needed to be used under the acidic condition in the prior art, and realizing the advantages of high acid resistance, good stability, lowered cost, simplified process and good practicability of the lipase in the use process.

The invention discloses a triphenylamine isoindigo polymer containing a biphenyl structure as well as a preparation method and application thereof. The invention aims to solve the problem of narrow application range of isoindigo caused by low solubility of isoindigo in organic solvents in the prior art. The preparation method comprises the following steps: preparing a triphenylamine monomer with abiphenyl structure, introducing a long alkyl chain into 6-bromoisoindole, and substituting two bromides of 6-bromoisoindole with tributyl tin chloride to form reaction active sites to react with thetriphenylamine monomer with the biphenyl structure so as to generate the polymer. The finished product is easy to dissolve in a polar solvent, and 1-1.5 g of the polymer can be dissolved in every 10 ml of a polar solution. The polymer is applied to the field of multifunctional materials.

The invention relates to the technical field of a non-woven fabric, provides a preparation method of a thermosensitive color change non-woven fabric, and solves problems that in the prior art, a color-changing agent required for preparing thermosensitive color change fibers has a high requirement for temperature resistance, durability of the prepared thermosensitive color change fibers is reducedand the prepared thermosensitive color change fibers are poor in hand feeling. The preparation method comprises the following steps of: (1) using thermosensitive color change fibers and common ES fibers as raw materials of the thermosensitive color change non-woven fabric, wherein the thermosensitive color change fibers are of a skin-core type structure and comprise skin layers and core layers, each skin layer comprises the following raw materials in parts by weight: 0.8 to 3 parts of color fixative, 1 to 30 parts of color developing agent, 30 to 90 parts of polyethylene glycol 1500 and 60 to100 parts of polyethylene, and each core layer is polyethylene terephthalate; (2) respectively carrying out opening mixing, carding, hot air adhesion and cooling setting on the thermosensitive color change fibers and the common ES fibers to prepare a first non-woven fabric and a second non-woven fabric; and (3) carrying out online compounding on the first non-woven fabric and the second non-wovenfabric which are prepared in the step (2).