37results about How to "Sensitive to discoloration" patented technology

The indicator comprises organic solvent with 10-40wtúÑ inorganic salt and 0.1wtúÑ-5wtúÑ chromaticity indicator without cobalt. Thus, factor of polluting environment and harming health to people is removed thoroughly. The invented product is excellent product of environment protection with low cost. Allochroic silica gel made from the invented indicator can be used in multiple regenerations.

The invention relates to low-temperature reversible chromotropic pigment and a preparation method of the low-temperature reversible chromotropic pigment, a temperature-sensitive pavement marking coating and a preparation method and application of the temperature-sensitive pavement marking coating. The preparation method of the low-temperature reversible chromotropic pigment comprises the followingsteps: firstly, uniformly mixing a hidden body, a chromogenic agent and a regulator, heating, carrying out heat preservation and then naturally cooling to obtain a low-temperature reversible chromotropic compound solution; adjusting the pH value to be 3 to 6 after emulsifying the low-temperature reversible chromotropic compound solution, rising the temperature after adding a resin prepolymer solution, cooling to the temperature of 30 to 40 DEG C after stopping the reaction, adding a dispersant I to be uniformly dispersed, carrying out suction filtration, washing and drying to obtain the low-temperature reversible chromotropic pigment; the temperature-sensitive pavement marking coating is prepared from the low-temperature reversible chromotropic pigment and a filler, a dispersant II, a wetting agent, acrylic emulsion, a film-forming additive and the like, and can be used for preparing temperature-sensitive pavement marks. The low-temperature reversible chromotropic pigment prepared bythe invention can produce color reversible changes when the temperature changes, and the temperature-sensitive pavement marks are prepared, thereby being capable of reminding a user of icy pavements timely to reduce traffic accidents.

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 a method for detecting a content of cerous sulfate in a tin-cerium alloy electroplating solution and belongs to the field of electroplating solution analysis technologies. The method is mainly characterized by comprising the following steps: oxidizing the electroplating solution to be detected by using perchloric acid, phosphoric acid and nitric acid with a certain concentration; with N-phenyl o-aminobenzoic acid as an indicator, detecting the content of the cerous sulfate in the tin-cerium alloy electroplating solution in a way of titrating tetravalent cerium into trivalent cerium by using an ammonium ferrous sulfate standard titration solution. The detection method has the characteristics that the detection is simple, the detection process is convenient, quick and environment-friendly and low in cost, and the detection results are accurate and coincident.

The invention relates to the technical field of fluorescent materials, in particular to a piezochromic tetraphenylethylene compound as well as a preparation method and application thereof. The tetraphenylethylene-based compound has excellent piezochromism and molecular aggregation-induced fluorescence, can change color without solvent fumigation and heating, and has a rapid recovery property. The preparation method comprises the following steps: reacting diphenylacetylene with bis (pinacolato) diboron to prepare stilbene (pinacolato) diboron, and reacting with a p-bromobenzene substituent to obtain a final product. Due to the piezo-chromic effect and the rapid recovery property of the piezo-chromic tetraphenylethylene compound, the piezo-chromic tetraphenylethylene compound can be applied to preparation of piezo-chromic materials at room temperature and is further applied to the fields of brain tumor imaging technologies, near-infrared probe technologies, photoelectric devices and the like.

The invention discloses a color-changing luggage film sheet, which comprises a base material and a color-changing ink printed on the base material. The color-changing ink comprises the following components by weight: 3-8 parts of a color-changing pigment; 10-20 parts of polyurethane; 50-70 parts of polycarbonate; 15-25 parts of a solvent. According to the color-changing luggage film sheet, the color-changing ink is printed on the base material, a paint spraying procedure is not needed, the color is uniform, and when temperature or light changes are sensed, color changing can be achieved. The invention further discloses a preparation method of the color-changing luggage film sheet, and the process is simple and convenient. The invention also discloses a color-changing luggage, which is formed by blister molding of a panel compounded with the color-changing film sheet, and is sensitive in color changing, uniform in color, attractive and elegant. The invention further discloses a preparation method of the color-changing luggage, a color-changing panel material is firstly processed, then the luggage is manufactured, paint spraying is not needed, and the effects of high efficiency, lowloss and uniform color are achieved.

The invention discloses a preparation method of a pH value sensitive micro capsule. The preparation method comprises the following steps: step 1, mixing pH value sensitive silica gel coated with an organic liquid layer and provided with a primary pore passage with an emulsifier aqueous solution; step 2, adding a high-molecular-weight water-soluble prepolymer containing urea and formaldehyde and alow-molecular-weight water-soluble prepolymer containing urea and formaldehyde into the mixed solution obtained in the step 1, and reacting at 45-55 DEG C for 2-3 hours to obtain micro capsules; step3, soaking the micro capsules prepared in the step 2 in ethanol, and dissolving low-molecular-weight urea-formaldehyde resin to form a secondary pore passage; and cleaning and drying the micro capsules with the composite holes to obtain a target product. The invention also discloses an application of the pH value sensitive micro capsule. The pH value sensitive micro capsule with a composite structure is prepared by matching the raw materials with the preparation process, and the pH value sensitive micro capsule is sensitive in pH color change and stable in structure; when being applied to textiles, the pH value sensitive micro capsule has an obvious indication effect on acidity, and meanwhile, the rubbing color fastness and the washing color fastness meet corresponding national standards.

The invention relates to a Nutritional digestive juice for chlamydia neutralization, in particular to a prescription of a cell culture medium used when a urethritis patient needs the examination of the chlamydia cell culture after using a large amount of clinical antibiotics and a preparation method of the cell culture medium. The genital tract chlamydia trachomatis infection is one of the most common diseases which are sexually transmitted. Chlamydia trachomatis is also regarded as the important cause of the pelvic inflammatory disease and the sequelae (tubal infertility and ectopic pregnancy) thereof. The chlamydia cell culture method is the most sensitive and the most reliable method used for examining the chlamydia. The culture medium can detect out the positive result of the genital tract chlamydia after the large amount of clinical antibiotics is used, thereby having the function of the clinical diagnosis guidance and the clinical treatment and the important meaning of preventing the abuse of the antibacterial drugs.

The invention relates to the technical field of electric heating appliances and discloses a thermochromic coating, a preparation method of the thermochromic coating, a heating device and cooking equipment. The thermochromic coating comprises a priming coating, a thermochromic decorative layer and a finishing coating which are sequentially overlaid on a substrate. The priming coating contains adhesive resin, fluorine resin and powdery inorganic matter resistant to at least 200 DEG C, and the adhesive resin, the fluorine resin and the powdery inorganic matter resistant to at least 200 DEG C areevenly distributed in the priming coating. According to the thermochromic coating, the priming coating contains the high-temperature-resistant inorganic matter, the high-temperature-resistant inorganic matter can prevent the adhesive resin and the fluorine resin from flowing, gathering and clustering in the melting and firm-forming process and enables the adhesive resin and the fluorine resin to be more evenly distributed on the priming coating, and therefore color change of the thermochromic decorative layer is more sensitive.

The invention discloses temperature-resistant anti-corrosion color-changing paint and a preparation method thereof. The temperature-resistant anti-corrosion color-changing paint is prepared from the following raw materials in proportions: 55-60% of carboxy-terminated hyperbranched polyamide resin, 10-15% of titanium dioxide, 5-10% of hollow beads, 5-10% of anti-rust pigment, 5-10% of active nano-calcium, 0.1-0.2% of graphene, 2-2.5% of a dispersant, 0.1-0.3% of a defoamer, 1-2% of an anti-flash rust additive, 0.5-1% of a substrate wetting agent, 0.5-1% of a thickener, 20-30% of deionized water, 3-5% of a curing agent and 10-15% of color-changing pigment. The environmentally-friendly temperature-resistant anti-corrosion color-changing paint prepared with the preparation method provided by the invention is one-component water-based industrial paint. The anti-corrosion color-changing paint is not only resistant to high temperature and corrosion, but also has a wide range of applications,and is suitable for special work in the painting field.

The invention relates to the technical field of aerospace, and in particular, relates to aviation fuel free water detection test paper as well as a preparation method and a detection device thereof. The detection test paper comprises filter paper, potassium ferricyanide loaded on the surface of the filter paper, and a mixture of ferrous sulfate and a chelating agent. The preparation method of theaviation fuel free water detection test paper comprises the steps: infiltrating the filter paper into a K3[Fe(CN)6] solution, and then drying to obtain intermediate detection test paper; and coating the surface of the intermediate test paper with a powder mixture of FeSO4 and the chelating agent on. The aviation fuel free water detection test paper provided by the invention has the following advantages that the detection method is simple and convenient, easy to operate, free of specialization and instruments, convenient to use, capable of detecting by naked eyes, intuitive, concise, rapid andefficient; the detection sensitivity is high; the effective service life is long, whether failure occurs or not can be easily judged through visual color change, and the detection reliability is improved; the production cost is low.

The invention discloses a preparation method of medical carbon dioxide adsorbent calcium lime. The medical carbon dioxide adsorbent calcium lime comprises the following components in percentage by weight: 50 to 55 percent of a main absorbent, 3 to 5 percent of a wetting agent, 3 to 5 percent of lithium hydroxide, 3 to 5 percent of triethanolamine, 3 to 5 percent of an enhancer, 3 to 5 percent of polyvinyl alcohol, 3 to 5 percent of a PH indicating coloring agent, 3 to 5 percent of a disintegrating agent and the balance of water. The preparation method specifically comprises the following preparation steps: 1, preparing the main absorbent, pulverizing and passing through a 800-mesh sieve to obtain main absorbent powder for future use; 2, mixing the main absorbent, the wetting agent and theenhancer according to the mass percentage ratio of 77:4:3 to perform preparation, stirring for 1 hour until the materials are basically uniform, preparing a PVA solution with the mass percentage of 8percent by weight according to a water bath method, and preparing a pH indicating coloring agent solution of 15 g/L. Calcium hydroxide serves as a main component, the calcium hydroxide can react withacidic gas CO2, has certain hardness and is not liable to absorb moisture, and lots of heat is not generated during preparation, so that the cost is low, and the whole process is simple, safe, controllable and suitable for being widely popularized.

The invention discloses a method for preparing a forward-switched reversible thermochromic composite film and relates to preparation methods for reversible thermochromic composite films. The object of the invention is to solve the problems that the existing thermochromic films are reversely switched, are chromogenic at room temperature and are achromatic during heating-up, and the apparent integrity of a product can be destroyed and the attractiveness of the product is affected when the existing thermochromic films are applied to the surface of the product. The method comprises the steps: (1) pretreating a glass plate; (2) preparing a mixed solution; (3) preparing a coating solution; and (4) carrying out spraying and drying, thereby obtaining the forward-switched reversible thermochromic composite film. The reversible thermochromic composite film prepared by the method is forwardly switched, are achromatic at room temperature and are chromogenic during heating, so that the aim of keeping integrity of the product can be achieved when the reversible thermochromic composite film is applied to the surface of the product; and the forward-switched reversible thermochromic composite film prepared by the method has relatively good elastoplasticity and is environmentally friendly, environment-friendly, non-toxic and harmless. The invention can achieve the method for preparing the forward-switched reversible thermochromic composite film.

The invention relates to a synthesis method of a POSS-based membrane material with reversible color change and ultraviolet shielding functions, belonging to the technical field of synthesis of POSS-based materials. The method solves the problems that at present, materials with both thermochromism and ultraviolet shielding performance are few, and the application range of POSS is fixed. The method comprises the steps: dissolving POSS in water; adding a copper salt and a chromium salt into the POSS aqueous solution, and stirring at room temperature for 3 hours; and stirring at 20-40 DEG C for 1-24 hours, and volatilizing the solvent at 20-80 DEG C to obtain the POSS-based membrane material with reversible color change and ultraviolet shielding functions. The POSS-based membrane material with reversible color changing and ultraviolet shielding functions is synthesized for the first time, the POSS-based membrane material is changed from green to luminous yellow at 80 DEG C and is obvious in color changing, the membrane material almost has no ultraviolet transmittance at 200-400 nm, the ultraviolet transmittance is almost 0%, and the POSS-based membrane material can be used as an ultraviolet shielding material. According to the room-temperature synthesis and environment-friendly method disclosed by the invention, POSS is simultaneously applied to the fields of color change and ultraviolet shielding.

The invention discloses a method for rapid determination of sulfate radical content in a liquid phase in the process of production of potassium dihydrogen phosphate, and belongs to the field of analytical chemistry. The method comprises the following steps: taking barium chloride standard solutions with different volume gradients into colorimetric tubes, successively adding an acid, a stabilizer, an indicator and a to-be-tested sample, rapidly shaking the colorimetric tubes for 30s, observing the color change of the colorimetric tubes; and if one of adjacent colorimetric tubes shows red, and the other one of the adjacent colorimetric tubes shows white, determining that the to-be-tested sulfate radical concentration is between the concentration marked by the colorimetric tube showing red and the concentration marked by the colorimetric tube showing white. The method is an improvement of a sodium rhodizmate colorimetric method, by adding of the stabilizer, the method can also be applied under the condition of acidity, transition color can be eliminated, and detection precision is improved.

The invention discloses a tea extract gel composition with formaldehyde discoloring performance. The tea extract gel composition is prepared from the following components in percentage by mass: 1 to 10 percent of tea extract, 1 to 20 percent of polyacrylamide and the balance of water. Wherein various assistants can also be added. The tea extract gel composition disclosed by the invention can react with formaldehyde and generate obvious color change, so that the tea extract gel composition can be used for absorbing and indicating formaldehyde pollutants.