116 results about "Uv absorbance" patented technology

This invention discloses a method for detecting polycyclic aromatic hydrocarbons (PAHs) based on ultraviolet fluorescence and absorption spectroscopy, comprising: Step 1, acquiring the ultraviolet absorption spectrum and the fluorescence emission spectrum of a water sample under ultraviolet light excitation; Step 2, analyzing the corresponding CDOM fluorescence spectrum using the ultraviolet absorption spectrum obtained in Step 1; Step 3, subtracting the CDOM fluorescence spectrum obtained in Step 2 from the fluorescence emission spectrum obtained in Step 1 to obtain a mixed fluorescence spectrum containing multiple PAHs; Step 4, performing multivariate fitting on the mixed fluorescence spectrum obtained in Step 3 to obtain the type and concentration of each PAH in the water sample. This invention also provides a PAH detection device. The method provided by this invention is simple to operate and can directly detect raw water samples, thereby obtaining more accurate PAH detection results.

The application belongs to the field of pesticide residue detection, and particularly relates to a method for determining pesticides in water samples. The method comprises the following steps: amino modification is performed on MIL-100(Fe) to obtain an amino-functionalized MIL-100(Fe) material; and the pesticides in the water sample are analyzed and detected by using SALDI-TOF-MS with the amino-functionalized MIL-100(Fe) material as a substrate. The application forms a special MOF material by performing amino functionalization modification on MIL-100(Fe), which can enhance the interaction force between the substrate and the analyte, exhibits good ultraviolet absorption and energy transfer capacity, and thus improves the desorption / ionization efficiency in LDI detection. The method is used to detect pesticide residues, and in the low mass region, lower background noise and higher signal intensity are exhibited, so that the detection of pesticide substances in the small molecule region is greatly broken through, and the detection limit is greatly reduced.

The application discloses an anti-ultraviolet aging polycarbonate modified material and application thereof, and belongs to the technical field of polymer material modification. The material comprises synergistically modified polycarbonate, an organic small-molecule functional regulator, an antioxidant, a light stabilizer, a lubricating dispersant and an inorganic filler, wherein the synergistically modified polycarbonate is constructed into a multiple synergistic network by introducing a borate dynamic covalent structure, a Schiff base structure and a rare earth coordination structure, and the organic small-molecule functional regulator is p-hydroxybenzophenone. The preparation method comprises preparation of the synergistically modified polycarbonate and a subsequent melt blending and extrusion process. Through the technical scheme, the synergistic effect of ultraviolet absorption, energy transfer and free radical inhibition is realized, the yellowing degree of the material is significantly reduced, the mechanical property retention rate and the optical stability are improved, and the material is suitable for the fields of automobile transparent parts, outdoor optical materials and electronic and electrical shell.

The application belongs to the technical field of automobile intelligent display and polymer optical material, and relates to a front windshield anti-reflection film for automobile AR-HUD and a preparation method thereof. The anti-reflection film comprises modified optical acrylic resin, 9,9-bis(4-hydroxyphenyl) fluorene, nano-silica sol, ultraviolet absorber, light stabilizer and leveling agent. The modified optical acrylic resin is modified by introducing o-diphenol structural unit, aryl boronic acid structural unit, beta-cyclodextrin structural unit and adamantane structural unit into the acrylate base structure to form a dynamic borate ester bond and a host-guest inclusion synergistic topological network structure through free radical copolymerization. The anti-reflection film significantly improves the reflection efficiency of the target wave band of AR-HUD while maintaining high visible light transmittance, and exhibits excellent optical stability and double image control ability in a humid heat environment, and is suitable for the field of optical functional film of automobile front windshield.

This application provides a method for preparing gallium oxide (GaO) with enhanced ultraviolet absorbance and a GaO material prepared according to this method. First, a GaO thin film capable of generating ultraviolet absorption is grown on a substrate by magnetron sputtering. The GaO thin film is then annealed. Next, a copper thin film is grown on the GaO thin film by magnetron sputtering, followed by rapid annealing, causing the copper film to crack into copper nanoparticles under heat. This preparation method utilizes copper nanoparticles to enhance the ultraviolet absorption performance of GaO. The process steps are simple and easy to operate, thus effectively reducing the preparation cost. Furthermore, the GaO material prepared by this method shows a significant improvement in ultraviolet absorbance.

The application discloses a sunscreen composition based on the ultraviolet absorption characteristics of yellow water of liquor, and a preparation method and application thereof. The sunscreen composition comprises 10-60 parts by weight of a yellow water extract of a strong-flavor liquor, 20-70 parts by weight of a yellow water extract of a Maotai-flavor liquor, and 0-40 parts by weight of a yellow water extract of a light-flavor liquor. It is found that the yellow water of different flavor liquors has characteristic ultraviolet absorption spectrum, wherein the yellow water of the strong-flavor liquor has strong absorption in the UVB band (290-320 nm), the yellow water of the Maotai-flavor liquor has strong absorption in the UVA band (340-380 nm), and the yellow water of the light-flavor liquor has relatively uniform absorption in a wide band. According to the spectral complementarity, the natural sunscreen composition is obtained. The sunscreen composition has an in-vitro SPF value of 15-35, a PA value of ++~++++, good light stability and low skin irritation.

This invention discloses gold nanoparticle-modified metal oxide framework materials, their preparation methods, and applications, relating to the fields of material preparation and detection technology. The preparation method of the gold nanoparticle-modified metal oxide framework material includes: in-situ reduction of chloroauric acid on the surface of ZIF-67 via a reduction method to obtain an Au / ZIF-67 composite material; and calcination of the Au / ZIF-67 composite material using a programmed temperature rise process to obtain the final product. This invention also provides applications of this material in serum metabolite detection and in screening metabolic biomarkers for esophageal cancer diagnosis. The composite material prepared by this invention possesses a unique hollow porous structure and uniformly distributed gold nanoparticles, providing a large specific surface area for enriching metabolites in serum. It also enhances the ultraviolet absorption and photothermal conversion efficiency of the nanocomposite material, while improving the material's conductivity, thereby significantly improving laser desorption / ionization efficiency and achieving high-sensitivity detection.

Compositions Containing a UV Absorbing System Including a UV Attenuating Physical Material and an Oil to Inhibit Aggregation of the UV Attenuating Physical Material. This disclosure relates to compositions including a UV absorbing system comprising at least one ultraviolet (UV) attenuating physical material and at least one oil to inhibit the aggregation of the ultraviolet (UV) attenuating physical material, as well as processes for preparing and using such compositions. Figure for abstract: none

This invention relates to a laser-engravable high-gloss black coating for automotive taillights and its preparation method, belonging to the field of coating preparation technology. The formulation of the laser-engravable high-gloss black coating is as follows (by weight): 40-60 parts polyurethane acrylate, 3-5 parts modified nano-bismuth oxide, 3-5 parts trimethylolpropane triacrylate, 1-3 parts 4-methylbenzophenone, 1-2 parts carbon black, and 0.5-1.5 parts leveling agent. The modified nano-bismuth oxide is prepared by treatment with ammonium molybdate solution and grafting with a silane coupling agent. Its layered structure synergistically enhances UV absorption efficiency and weather resistance with the molybdate layer. 4-methylbenzophenone and modified nano-bismuth oxide form a light absorption composite system, which, combined with the high cross-linking density network constructed by trimethylolpropane triacrylate, achieves narrow linewidth laser engraving precision. This invention solves the technical problems of low laser engraving precision, poor adhesion, and insufficient solvent resistance in traditional high-gloss black coatings, and is particularly suitable for precision marking applications such as automotive taillights.

This invention discloses a method for preparing and applying a high-efficiency fixed-wavelength reflective film for silicon-based power generation in the field of photovoltaic power generation enhancement materials. The method involves mixing and extruding a functional masterbatch made from cerium-yttrium modified magnesium fluoride-coated barium sulfate microspheres, cerium-zirconium modified rutile titanium-silicon composite microspheres, rutile titanium dioxide, precipitated barium sulfate, hollow glass microspheres, light calcium carbonate, maleic anhydride-grafted polyethylene, and high-density polyethylene resin. This masterbatch is then co-extruded and blow-molded with low-density polyethylene, ethylene-octene copolymer, silicone masterbatch, polytetrafluoroethylene, antioxidants, UV absorbers, light stabilizers, calcined kaolin, and oxidized polyethylene wax to form a film. The film is then embossed, corona-treated, and wound to obtain the final product. This reflective film exhibits high diffuse reflectance, weather resistance, wear resistance, and anti-aging properties, and can be used in medium to large-scale photovoltaic power plants to improve the power generation efficiency of silicon-based photovoltaic modules.

The present invention relates to a laminated film comprising a hard coating layer and a substrate, wherein the hard coating layer comprises a near-ultraviolet absorber and an ultraviolet light enhancer / decreaser, and the substrate comprises an ultraviolet blocking additive, and to an image display device comprising the same.

The application relates to a gold nanoparticle array preparation method with strong stability and reusability, high cysteamine-stabilized gold nanoparticles are prepared first, the spacing between the gold nanoparticles is changed by utilizing the coulomb repulsion between the gold nanoparticles, then the gold nanoparticle solution is added dropwise to a glass surface modified by gamma-glycidoxypropyltrimethoxysilane to react, stable covalent bonds are formed, and gold nanoparticle arrays with uniform distribution on the glass surface can be obtained after the reaction. The preparation does not require high temperature, the experimental operation is simple and convenient, the gold nanoparticles are arranged in order and closely, have high detection sensitivity, have strong ultraviolet absorption capacity, good stability, reusability, salt resistance and low background interference, and can be reused. The gold nanoparticle array can realize detection analysis on high-salt-content samples in surface-assisted laser desorption ionization mass spectrometry and be used for rapid analysis of small molecule compounds in positive and negative ion dual modes.

A biosensor for detecting a hormone is provided. The biosensor for detecting a hormone can include a core component and a biological molecule (such as a receptor for the hormone or an antibody against the hormone) immobilized on the biosensor. Also provided are methods for detecting or quantitating a hormone in a sample using the biosensor provided herein. The biosensor can be a bio-layer interferometry (BLI) biosensor, and the signals generated by binding of a hormone to the biosensor can be indicative of spectral shift, which can be measured using BLI. Additional signals such as UV absorbance of the hormone or signals of a detectable label may be measured. The biosensor can detect the presence or amount of the hormone in a sample accurately without interference by the presence of biotin, hemolysis, or lipid in a sample.

The present application relates to a kind of judging methods of degumming state of silk, belong to silk fibroin production technical field, the degumming is to cut dry cocoon and put into degumming system and carry out degumming, by obtaining the first degumming liquid data and first silk data in the first degumming stage, obtain the second degumming liquid data in the second degumming stage, derive degumming liquid data change value, obtain second silk data based on degumming change value and first silk data, further judge the degumming state of silk, can only be determined by the conductivity of degumming solution and ultraviolet absorption peak value on-line judge degumming process corresponding degumming point silk fibroin degumming rate and silk fibroin molecular weight, can be used to monitor degumming progress, to control process to accurately control the molecular weight of silk fibroin, and suitable for alkaline degumming system and enzyme degumming system, provide universal judging standard, in the regulation silk fibroin molecular weight, cocoon raw material selection degumming process, screening cocoon raw material has important research significance and application value.

The application relates to a photovoltaic module and a preparation method and a preparation device thereof. The photovoltaic module comprises a cover plate, at least one cell string and an adhesive film, the adhesive film is located between the cover plate and the cell string, and the cover plate is connected with the cell string through the adhesive film; the adhesive film comprises a first sublayer, a second sublayer and a third sublayer which are arranged in layers; the first sublayer is located between the second sublayer and the cover plate, and the third sublayer is located between the second sublayer and the cell string; the first sublayer comprises a first base material layer and an ultraviolet absorber, the ultraviolet absorber is dispersed in the first base material layer, the ultraviolet absorber comprises at least one of a thermal quantum dot and an organic metal framework compound; the second sublayer comprises a second base material layer; and the third sublayer comprises a third base material layer and a microcapsule, the microcapsule is dispersed in the third base material layer, the microcapsule comprises a hot-melt shell and a repairing agent, and the repairing agent is filled in the interior of the hot-melt shell.

This invention relates to a nonlinear optical crystal of potassium triacetate dihydrate, its preparation method, and its uses. The molecular formula of the crystal is K3C6O8H. 10 It has a molecular weight of 331.62, belongs to the orthorhombic crystal system, and has a space group of [missing information]. P 212121, cell parameters are a =8.7596(5)Å, b =10.0487(6)Å, c =13.9979(6)Å, α =90.00° β =90.00° gamma =90.00° Z =4, V =1232.13(11)Å 3 Centimeter-sized crystals were grown using an evaporation method and an aqueous solution cooling method. Under 1064nm laser irradiation, the powder frequency doubling effect of this crystal was equivalent to that of KH₂PO₄. 4 (KDP). This crystal has an ultraviolet absorption edge shorter than 200 nm and an experimental birefringence of approximately 0.06 at 546 nm. It is simple to prepare, low in cost, exhibits significant nonlinear optical effects, a large birefringence, a wide transmission range, and is easy to grow and process. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

This invention belongs to the field of polymer materials technology, and specifically relates to a PMMA composite material based on waste automotive lamp plastic and its preparation method. The raw materials include the following parts by weight: 70-85 parts waste PMMA granules, 8-18 parts modified magnesium hydroxide, 5-15 parts modified hydroxyapatite, 3-8 parts toughening agent, 0.2-0.8 parts antioxidant, 0.1-0.5 parts ultraviolet absorber, and 0.3-0.8 parts lubricant. The modified magnesium hydroxide is modified through organic processing, phosphorus and nitrogen flame retardancy, and grafting with ultraviolet absorbing groups. The modified hydroxyapatite is modified through phytic acid modification, silane bridging, and grafting with ultraviolet absorbing groups. These two materials work synergistically with waste PMMA granules, toughening agents, and other additives to obtain a PMMA composite material with excellent flame retardancy, outstanding resistance to ultraviolet aging, good mechanical properties, and heat resistance through a specific process, achieving high-value recycling of waste automotive lamp plastic.

The application relates to the technical field of photovoltaic adhesive films, and discloses an anti-radiation photovoltaic packaging adhesive film, a preparation method thereof and a photovoltaic module. The adhesive film is a multilayer co-extrusion composite structure formed through co-extrusion molding and irradiation, and comprises an upper surface layer, a middle functional layer and a lower surface layer; the upper surface layer is a radiation-resistant polymer matrix (such as EVA-g-St, EVA-g-(alpha-MeSt), POE-g-St or an EVA / POE-aromatic resin blend); the middle functional layer comprises a packaging resin matrix, an anti-radiation agent (a nanoscale radiation protection material such as a rare earth oxide, a heavy metal oxide, a boron-containing compound or a high molecular derivative of a benzotriazole type ultraviolet absorber) and a stabilizer; and the lower surface layer is a bonding surface layer formed by a light-transmitting bonding resin. The adhesive film has good radiation resistance, and the light transmittance, bonding property, elongation at break retention rate, yellowing resistance and module power attenuation resistance of the adhesive film after accelerated irradiation are obviously improved, so that the service life of the module under strong radiation can be prolonged.

This application relates to the field of PET plastics technology, and more particularly to a UV absorber and PET plastic. The UV absorber is prepared by the following method: under a protective gas atmosphere, alkyl α-cyano-4-hydroxy-3-alkoxycinnamic acid, an inorganic base, and an epoxy chain extender are dissolved in a polar aprotic solvent, and the mixture is stirred and reacted at 100°C~120°C for 2~8 hours. After the reaction, acidification, filtration, washing, and drying are performed sequentially. The solution provided in this application can effectively improve the dispersion stability of the UV absorber in the PET matrix, reduce the risk of migration and precipitation, and maintain the advantage of high material transparency.

The application discloses a TAC composite film and a preparation method thereof, and belongs to the technical field of optical films. The TAC composite film comprises a modified TAC base film and a functional protective coating. The modified TAC base film is prepared by casting a triacetate cellulose solution into a film. According to mass fractions, the triacetate cellulose solution comprises the following raw materials: 20 parts of triacetate cellulose, 1-2 parts of mercapto-esterified cellulose, 0.1-0.3 parts of a plasticizer, 0.1-0.4 parts of an ultraviolet absorber and 80-100 parts of a mixed solvent. The functional protective coating is obtained by light curing after coating of a coating slurry. According to mass fractions, the coating slurry comprises the following raw materials: 30 parts of a light-cured acrylate prepolymer, 4-8 parts of alkenyl quaternary ammonium cellulose, 0.5-1.5 parts of a photoinitiator and 40-50 parts of a solvent. The application adds mercapto-esterified cellulose to the base film and adds alkenyl quaternary ammonium cellulose to the coating, so that the interfacial bonding force is enhanced through chemical action.

This invention discloses a method for identifying fresh / dried cocoon raw silk based on ultraviolet absorption spectroscopy. The method includes: pre-treating and extracting raw silk samples from fresh and dried cocoons to obtain a test solution; collecting the ultraviolet absorption spectra of the test solution and ultrapure water, and obtaining a corrected ultraviolet absorption spectrum after background signal correction; pre-processing the corrected ultraviolet absorption spectrum to obtain a pre-processed spectrum and its derivative spectrum; performing difference analysis to screen difference scoring indicators, and then establishing a discrimination model for fresh and dried cocoons; obtaining the pre-processed spectrum and its derivative spectrum of the raw silk sample to be identified, inputting them into the discrimination model for processing, and outputting the category to complete the identification of fresh and dried cocoon raw silk. This invention is convenient to operate, uses relatively common instruments, has high accuracy, and the accuracy can be further improved with increasing sample size, making it easy to promote and apply, and meeting the needs of identifying fresh / dried cocoon raw silk.

This invention relates to the field of polymer material additives technology, and discloses a reactive ultraviolet composite stabilizer and its application in TPEE. The aim is to solve the problem that traditional physical blending light stabilizers are prone to migration and volatilization, leading to insufficient long-term weather resistance of polymers. This invention designs and synthesizes a composite stabilizer with primary hydroxyl groups retained at both ends of the molecule, using dibromoneopentyl glycol as the backbone and connecting its two ends of bromine atoms to hindered amine derivatives containing hydroxyl groups and triazine ultraviolet-absorbing derivatives via ether bonds. This stabilizer can be used as a comonomer, achieving permanent bonding and fixation during the polycondensation process of TPEE through the chemical embedding of its two primary hydroxyl groups into the polymer backbone. This allows it to exert non-migrating properties and the synergistic effect of the intramolecular hindered amine and ultraviolet-absorbing groups, thereby improving the anti-ultraviolet aging performance and long-term stability of TPEE products.

This invention discloses potassium borosilicate, potassium borosilicate nonlinear optical crystals, their preparation methods, and applications, belonging to the field of nonlinear optical crystal technology. The chemical formula of potassium borosilicate is K4B6Si3O. 17 With a molecular weight of 577.53, it was prepared using solid-state synthesis or vacuum encapsulation; the chemical formula of this crystal is K4B6Si3O. 17 It has a molecular weight of 577.53, belongs to the monoclinic crystal system, and has a space group of C 2. The unit cell parameters are a =11.8628(13)Å, b =6.6285(6)Å, c =11.0097(19)Å, β =117.183(4)°, unit cell volume is 770.10(17) Å. 3 The powder frequency doubling effect of the crystal is about 1.4 times that of KH2PO4 (KDP), and the ultraviolet absorption edge is shorter than 190 nm. The crystal has good chemical stability and can be used as an ultraviolet and deep ultraviolet nonlinear optical crystal in all-solid-state lasers.

EMULSION COMPOSITIONS CONTAINING A UV-ABSORBING SYSTEM INCLUDING A UV-ATTENUATING PHYSICAL MATERIAL AND A PARTICLE MATERIAL This disclosure relates to emulsion compositions comprising a UV-absorbing system (component) including at least one ultraviolet (UV) attenuating physical material and a particulate portion (component) including at least one substantially spherical particulate material and at least one amorphous particulate material, as well as processes for manufacturing and using such compositions. Figure for abstract: none

This invention relates to the field of power protection equipment technology, and discloses a flat-walled reinforced spiral corrugated power protection tube, comprising an inner layer and an outer layer arranged sequentially from the inside out. The inner and outer layers are co-extruded to form a composite tube strip, which is then spirally wound. The inner layer comprises high-density polyethylene, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, maleic anhydride-grafted polyethylene, maleic anhydride-grafted ethylene-octene copolymer, ethylene-propylene random copolymer, talc, and hydrotalcite. The outer layer comprises high-density polyethylene, ethylene-methyl methacrylate copolymer, rutile titanium dioxide, iron oxide red, hindered amine light stabilizer, and benzotriazole UV absorber. This invention improves the contact stability between the inner wall of the sheath and the guy wire through the inner layer composite system, reducing micro-slippage, repeated friction, and localized impacts, and reduces fading through the outer layer weather-resistant system.

The application discloses a preparation method of ultraviolet absorber and sunscreen, and belongs to the cosmetic field. The preparation method of the ultraviolet absorber comprises the following steps: dissolving 5,6-dihydroxyindole-2-carboxylic acid in a solvent to obtain a 5,6-dihydroxyindole-2-carboxylic acid solution; adding 2-formylphenylboronic acid and amino-terminated polydimethylsiloxane into the 5,6-dihydroxyindole-2-carboxylic acid solution, and stirring to obtain a mixed solution; and removing the solvent in the mixed solution to obtain the ultraviolet absorber. The preparation method of the sunscreen comprises the following steps: adding the ultraviolet absorber and zinc oxide nanoparticles into an oil phase in a moisturizing cream base, performing colloidal grinding, and performing heating and stirring until emulsification is achieved; and then mixing a water phase in the moisturizing cream base to obtain the sunscreen. The application can solve the problems that 5,6-dihydroxyindole-2-carboxylic acid has the shortcomings of narrow ultraviolet absorption band, easy oxidation polymerization leading to color deepening, and inability to realize molecular-level synergistic regulation of electronic structure to realize directional red shift of the absorption band.

The present invention relates primarily to graphitic carbon nitride having a porous structure, wherein the graphitic carbon nitride has at least one heptazine unit, originates from a first type of pore having a non-pore diameter of 1 nm or more and less than 15 nm, and originates from a second type of pore having a non-pore diameter of 15 nm or more and less than 50 nm, and has a pore volume greater than 0.0045 cm³ / g. The graphitic carbon nitride can provide enhanced UV absorption characteristics and can display a desired color.