59 results about "Uv absorption" patented technology

The invention relates to a method for simultaneously detecting three related substances in an olpinapone starting material. According to the detection method, the three related substances in an opinapone starting material are simultaneously detected by using a gas chromatographic method of a hydrogen flame ionization detector. According to the detection method, the problem that three related substances cannot be detected simultaneously due to weak ultraviolet absorption and large difference under the liquid chromatography condition can be solved, the matrix effect generated by an opiapone starting material under the gas chromatography condition can be eliminated, the condition that the separation degree of the three related substances is poor is improved, and the detection accuracy is improved while the detection efficiency is improved. And the true and reliable quality of the initial material of the olpinapone is also ensured. The method can be used for simultaneously and quantitatively detecting three related substances higher than 0.02% in the initial material of the opinapone, and is high in sensitivity, good in separation degree, high in practicability and simple and rapid in detection process.

The invention belongs to the technical field of thermoplastic polyurethane elastomers, and relates to UV-resistant bio-based thermoplastic polyurethane and a preparation method thereof, and the UV-resistant bio-based thermoplastic polyurethane comprises the following components by weight: 35-70 parts of bio-based polyester diol; 15 to 55 parts of diisocyanate; 2 to 15 parts of a chain extender; 0.2 to 1 part of an antioxidant; 0.001 to 0.05 part of a catalyst; the bio-based polyester diol is obtained by polycondensation of dicarboxylic acid and dihydric alcohol; the dicarboxylic acid comprises biomass muconic acid. The bio-based polyester type diol is synthesized by adopting bio-based muconic acid with an ultraviolet absorption function, so that the bio-based and UV-resistant characteristics are realized, and the thermoplastic polyurethane obtained in the manner has a good ultraviolet absorption function and good transparency, has a relatively high tensile strength retention rate after ultraviolet aging, and can be used for preparing the thermoplastic polyurethane. The method can be used in the fields of ultraviolet protection coatings, building materials, sunscreen fabrics and the like.

The invention provides a waterborne polyurethane / acrylate hybrid resin dispersion liquid, the dispersion liquid is composed of a solid component and a solvent, the solid content of the dispersion liquid is 35 wt%-45 wt%, and the solid component is polyurethane / acrylate hybrid resin; the solvent is deionized water, and the conductivity of the deionized water is not higher than 10 [mu] S / cm. The polyurethane / acrylate hybrid resin comprises a polyurethane chain segment and a polyacrylate chain segment, the polyurethane chain segment provides the characteristics of water resistance, wear resistance and weather resistance, and the polyacrylate chain segment provides the characteristics of acid resistance, alkali resistance and impact resistance; meanwhile, the polyurethane / acrylate hybrid resin further comprises an anti-ultraviolet absorption group and / or hindered amine and hindered phenol light stabilizing groups, so that the anti-ultraviolet characteristic of the polyurethane / acrylate hybrid resin is realized, and the weather resistance of the polyurethane / acrylate hybrid resin is further improved.

The invention relates to a siloxane polycarbonate rare earth modified composite material and a preparation method thereof. Polymethylsiloxane microspheres are prepared through a one-step hydrolysis-polycondensation method, a CeO2 coated PMSQ core-shell structure is constructed in combination with a chemical precipitation technology, uniform dispersion of cerium oxide nanoparticles is achieved, and the problems of agglomeration and interfacial compatibility of traditional CeO2 nanoparticles are solved. The tensile strength of the prepared composite material reaches 33 MPa, the ultraviolet absorption rate reaches 80% after 8 h, the limit oxygen index is 28.5%, and the flame retardant property reaches the V-1 level. The method is suitable for the fields with high weather resistance requirements, such as new energy automobiles and photovoltaics.

The invention discloses an anti-UV hydrolysis-resistant PET functional master batch and a preparation method thereof, UV absorbing groups such as isophorone diester and 2, 4-dihydroxybenzoic acid are introduced to enhance the UV resistance, and neopentyl glycol and trimethylolpropane are introduced to enhance the hydrolysis resistance of a molecular chain. Besides, the Beta molecular sieve, the zinc metaborate and other auxiliaries are utilized, so that the uniform distribution of the light stabilizer and the ultraviolet light absorber in the molecular structure is improved, and the problem that the UV absorption performance and the hydrolysis resistance of the film are not uniform due to molecular arrangement change in the stretching process is effectively avoided. The ultraviolet resistance, the strength and the hydrolysis resistance of the film are improved through the synergistic effect of all the components in the formula, so that the application requirements of PET products in the fields of packaging, electronics, photovoltaics, automobiles, medical instruments and the like are met.

The present invention provides a method for detecting ClO by fluorescence and ultraviolet. ‑ When the anion ClO is added to the pure aqueous solution of PY, ‑ , AcO ‑ ,H2AsO4 ‑ ,Br ‑ ,F ‑ ,Cl ‑ ,ClO4 ‑ ,CN ‑ ,H2PO4 ‑ ,HSO4 ‑ ,N3 ‑ ,NO3 ‑ ,NO2 ‑ ,OH ‑ ,SCN ‑ ,P2O7 2‑ When ClO ‑ It will cause significant quenching of the fluorescence emission spectrum and red shift of the UV absorption spectrum. However, the addition of other anions has no effect on the fluorescence and UV absorption of the phenazine derivative PY solution. It also shows good selectivity and anti-interference ability. At the same time, through fluorescence and UV titration experiments, it was found that ClO ‑ There is a good linear relationship between the concentration and fluorescence intensity, and the minimum fluorescence detection limit is calculated to be 5.59×10 ‑8 The minimum detection limit of M and UV is 5.84×10 ‑7 M. Finally, we made it into a test strip for semi-quantitative detection of ClO ‑ This recognition and detection performance has important application value in the field of ion recognition.

The invention discloses a PPR weather-resistant antibacterial pipe and a preparation method thereof, the finished product PPR weather-resistant antibacterial pipe is obtained by mixing, extrusion granulation, pipe extrusion molding, outer wall wiping and drying, annular spraying and drying, traction and cutting, and a weather-resistant agent of a pipe body is a compound of a hindered amine light stabilizer and an antioxidant. Carbon black dispersion liquid is sprayed to the outer wall of the pipe through the annular spraying mechanism to form a weather-proof coating, carbon black forms a physical barrier on the surface of the pipe by means of the excellent ultraviolet absorption capacity, direct irradiation of ultraviolet rays to the pipe body is further blocked, inner and outer synergistic dual weather-proof protection is formed with a weather-proof system in the pipe body, the light aging rate is greatly reduced, and the service life of the pipe body is prolonged. The antibacterial agent is a compound of a quaternary ammonium salt organic matter and a silver-zinc compound inorganic matter, according to the pipe, through the synergistic effect of an antibacterial agent compound system, the antibacterial spectrum is widened, the antibacterial durability is improved, and meanwhile the excellent aging resistance and mechanical performance are kept.

This invention provides modified zinc oxide and its applications, UV- and ozone-resistant self-lubricating materials and their preparation methods and applications, relating to the field of composite material technology. The modified zinc oxide provided by this invention is obtained by grafting zinc oxide onto a silane coupling agent using 2-mercaptobenzimidazole. The modified zinc oxide provided by this invention combines the excellent aging resistance of 2-mercaptobenzimidazole with the excellent UV absorption properties of zinc oxide, while also improving the dispersibility of nano-zinc oxide and overcoming the volatilization and migration problems of 2-mercaptobenzimidazole. This significantly improves the UV and ozone resistance of resin composites and effectively enhances their wear resistance. Resin composites filled with modified zinc oxide exhibit good reliability and service life in near-space environments, and show promising application prospects as self-lubricating pad materials for steering, load-bearing, rotating, and bushing components of aircraft.

The application provides a KrF resin, a preparation method thereof and a chemical amplification photoresist, and relates to the field of semiconductors. The KrF resin has a general structure as follows: the preparation method of the KrF resin comprises the following steps: mixing raw materials including 4-acetyloxy styrene, a first monomer compound, a second monomer compound and an initiator, and performing a first reaction; then adding an ammonium acetate-water suspension into the system, and performing a second reaction to obtain the KrF resin; the first monomer compound is a compound comprising a high ultraviolet absorption group, and the second monomer compound is a compound comprising a low-activation-energy deprotection acidic group. The chemical amplification photoresist comprises the KrF resin. The KrF resin provided by the application has the characteristics of controllable UV absorption and low deprotection activation energy. The chemical amplification photoresist has the ability to obtain good developing pattern results under different transmittance requirements.

The invention provides a laser release layer material and a preparation method and application thereof. The laser release layer material comprises the following components in parts by weight: 10-30 parts of thermoplastic resin, 0.5-4 parts of inorganic nanoparticles and 0.5-4 parts of photoresponse filler; and the UV-vis transmittance of the light response filling material is 0.001% to 10%. According to the invention, the laser release layer material with excellent performance is prepared by designing the material of the laser release layer, further using the thermoplastic resin and cooperating with the inorganic nanoparticles and the photoresponse filler with a specific UV absorption value. After the laser release layer prepared from the laser release layer material is de-bonded, the residual laser release layer material on the surface of a wafer can be cleaned together with a bonding layer, so that the production efficiency is improved, and the use types of cleaning agents are reduced.

According to the ultrathin PET functional master batch and the preparation method thereof disclosed by the invention, UV absorbing groups such as isophorone diester and 2, 4-dihydroxybenzoic acid are introduced, so that the absorption capacity of a molecular chain to ultraviolet rays is enhanced, and meanwhile, the aging resistance of a film is improved. Besides, by utilizing the Beta molecular sieve, the zinc metaborate and other auxiliaries, the uniform distribution of the light stabilizer and the ultraviolet light absorber in the molecular structure is improved, and the non-uniform UV absorption performance of the film caused by molecular arrangement change in the stretching process is effectively avoided. Due to the synergistic effect of the components in the formula, the ultraviolet resistance, strength and thermal stability of the film are improved, the performance uniformity of the film is ensured, and an innovative material solution is provided for preparation of the high-performance ultrathin PET film. According to the preparation method disclosed by the invention, the properties, such as mechanical strength, thermal stability and gas barrier property, of the PET material can be remarkably improved, so that the application requirements of ultrathin products in the fields of packaging, electronics, buildings and the like can be met.

This invention relates to an insulating glass (IG) window unit designed to prevent or reduce bird collisions therewith. The IG window unit includes at least first, second and third substrates (e.g., glass substrates). At least one of the substrates supports an ultraviolet (UV) reflecting coating for reflecting UV radiation so that birds are capable of more easily seeing the window, and wherein at least two of the substrates are laminated to one another via a polymer-based laminating film (e.g., of or including PVB, EVA, or SGP) that may have a high UV absorption. The UV reflecting coating is preferably patterned so that it is not provided across the entirety of the IG window unit. By making the window more visible to birds, bird collisions and bird deaths can be reduced. The provision of the laminated substrates in the IG window unit is particularly advantageous for bird collision windows, because it can further reduce bird collisions by providing an increased contrast ratio, improve durability, and improve processing.

Metal-organic frameworks (MOFs) may be prepared to contain a high loading of one or more hydrophobic adsorbates therein. Suitable metal-organic frameworks may exhibit stable retention of hydrophobic adsorbates within the pore space of the MOF, such as MOF loadings of at least 20% without appreciable environmental leaching over 24 hours. Certain hydrophobic adsorbates may exhibit unexpectedly higher photostability and UV absorption as compared to the respective free hydrophobic adsorbates.

This invention provides a colorimetric / fluorescence dual-mode nanozyme aptamer sensor, its preparation method, and its application in bisphenol A (BPA) detection. The sensor comprises a metal-organic framework nanozyme loaded with a BPA aptamer, hydrogen peroxide, and a chromogenic substrate, TMB. Cu / Zr-MOF oxidizes the colorless TMB to blue oxTMB, producing a UV absorption peak at 652 nm and a fluorescence emission peak at 415 nm. Modification with the BPA aptamer enhances the specific recognition ability of BPA, while simultaneously inhibiting the enzyme activity of Cu / Zr-MOF, leading to weakened colorimetric and fluorescence signals. In the presence of BPA, the aptamer specifically binds to the target and dissociates from the nanozyme surface, restoring enzyme activity and enhancing colorimetric and fluorescence signals. This invention integrates the excellent catalytic ability of nanozymes with the specific recognition ability of aptamers into a single system, achieving highly sensitive BPA detection.

The invention relates to an anti-ultraviolet agent, an anti-ultraviolet PP-based composite material as well as a preparation method and application of the anti-ultraviolet PP-based composite material. The composite material comprises the following components in parts by weight: 60-90 parts of polypropylene, 10-40 parts of talcum powder, 1-10 parts of an anti-ultraviolet agent, 5-20 parts of a flexibilizer, 0.5-5 parts of a compatibilizer, 0.3-1 part of an antioxidant and 1-5 parts of a lubricant. The anti-ultraviolet agent is tannic acid jointly modified by a silane coupling agent and a triazine ultraviolet absorbent containing an epoxy group, the anti-ultraviolet agent is prepared through hydrolysis, metal ion chelation and epoxy ring-opening grafting reaction, a macromolecular structure is formed, migration in a matrix is effectively inhibited, and the ultraviolet absorption wave band is widened. The invention also provides a preparation method of the composite material. The preparation method comprises the steps of raw material drying, premixing, melt extrusion and molding. The composite material has excellent anti-ultraviolet performance and good mechanical performance, is low in cost, simple in process and environment-friendly, and is particularly suitable for manufacturing the automobile lamp shell.

Multi-layer films, and processes to make the films, that enable the delivery of a substrate featuring a peelable thin layer of low haze, amorphous, isotropic film with the desired properties of high modulus, high usage temperature, UV blockage, and toughness. The films are made using a co-extrusion, co-orientation and annealing process to enable the delivery of a thin isotropic, UV blocking layer on top of a release layer and support substrate. These film constructions can be kept together during additional processing steps such as coating and converting. The release and dimensionally stable substrate layer can be easily removed once processing steps are completed.

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.

An optical detection system for a capillary electrophoresis instrument is disclosed. The optical detection system comprises an ultraviolet (UV) source and an absorption measurement optical path. The optical path comprises a first plurality of optical elements comprising a first optical fiber array and other elements. The first plurality of optical elements are arranged to obtain a plurality of respective UV beamlets from a UV beam emitted by the UV source and to direct, at least partially using the first optical fiber array, the respective UV beamlets through respective capillaries of a plurality of capillaries and to an absorption detector positioned to detect respective signals for use in obtaining respective UV absorption measurements corresponding to the respective capillaries.

The present invention relates to a method for simultaneously detecting three related substances in an opicapone starting material. The method employs gas chromatography with a hydrogen flame ionization detector (FID) to simultaneously detect the three related substances in the opicapone starting material. This method not only addresses the issue of weak and highly variable UV absorption of the three related substances under liquid chromatography conditions, preventing simultaneous detection, but also eliminates the matrix effect produced by the opicapone starting material under gas chromatography conditions and improves the poor resolution between the three related substances. This method improves detection efficiency while also ensuring the authenticity and reliability of the opicapone starting material. This method can simultaneously and quantitatively detect levels of the three related substances exceeding 0.02% in the opicapone starting material, demonstrating high sensitivity, good resolution, and robust practicality, while also simplifying and facilitating a rapid detection process.

The application provides a laser release layer material and a preparation method and application thereof. The laser release layer material comprises the following components in parts by weight: 10-30 parts of a thermoplastic resin, 0.5-4 parts of inorganic nanoparticles and 0.5-4 parts of a light response filler. The UV-vis transmittance of the light response filler is 0.001%-10%. The laser release layer material is prepared by designing the material of the laser release layer, further using the thermoplastic resin, cooperating with the inorganic nanoparticles and the light response filler with a specific UV absorption value. The laser release layer material has excellent performance. After the laser release layer prepared from the laser release layer material is debonded, the laser release layer material remaining on the wafer surface can be cleaned together with the adhesive layer, the production efficiency is accelerated, and the types of cleaning agents are reduced.

The utility model relates to the technical field of composite materials, and provides a short fiber reinforced thermoplastic composite material structure which comprises a protection structure, the protection structure comprises a top layer protection, a first absorption groove, a bottom layer protection and a second absorption groove, the bottom end of the top layer protection is adhered to the top end of first special glue, and the bottom end of the bottom layer protection is adhered to the top end of second special glue. A first absorption groove is formed in the top-layer protection, a bottom-layer protection is arranged at the bottom of the top-layer protection, and a second absorption groove is formed in the bottom-layer protection. Through the arrangement of the protection structure, the top protection layer has good ultraviolet resistance, the first absorption groove has good ultraviolet absorption performance, the bottom protection layer has good ultraviolet resistance, and the second absorption groove has good ultraviolet absorption performance. Meanwhile, the first special glue and the fiber structure both have anti-ultraviolet performance, so that the anti-ultraviolet function of the device is realized, and the practicability of the composite material is improved.

This invention discloses a combustion environment aerodynamic parameter measurement system and method based on the strong absorption advantage of ultraviolet (UV) spectroscopy, belonging to the field of combustion diagnostic technology. The measurement system includes: a fiber-optic coupled in-situ measurement unit for fiber-optic coupling of a UV beam emitted from a UV light source to obtain fiber-optic coupled absorption spectral signals of various small-area points; a UV absorption measurement and control analysis unit for obtaining the first UV absorption spectrum of each small-area point; a simulation unit for obtaining the second UV absorption spectrum of each small-area point; a training unit for training a neural network using the second UV absorption spectrum; and a calculation unit for calculating combustion environment aerodynamic parameters using the first UV absorption spectrum and the trained neural network. This invention can improve the accuracy of short-path probe measurements of combustion environment aerodynamic parameters.

This invention provides a colorimetric / fluorescence dual-mode sensor, its preparation method, and its application in histamine detection. The colorimetric / fluorescence dual-mode sensor comprises a metal-organic framework (HRP@AIE-MOF) loaded with horseradish peroxidase, hydrogen peroxide, and the chromogenic substrate o-phenylenediamine (OPD). The horseradish peroxidase (HRP) in the HRP@AIE-MOF oxidizes colorless OPD to yellow 2,3-diaminophenazine (DAP), producing a UV absorption peak at 425 nm and a strong fluorescence emission peak at 555 nm. The HRP@AIE-MOF also exhibits a strong fluorescence emission peak at 450 nm, which, together with the fluorescence signal of DAP, forms a ratiometric fluorescence sensor. This invention integrates the excellent catalytic ability of a natural enzyme with the luminescent properties of AIE-MOF into a single system, achieving highly sensitive histamine detection.

The present invention relates to a method for preparing optical devices using LiNH4SO4 quasi-phase-matched crystals and their use. The LiNH4SO4 crystals are used in the preparation of deep-ultraviolet quasi-phase-matched optical devices. LiNH4SO4 quasi-phase-matched crystals have advantages such as a short UV absorption cutoff edge, moderate nonlinear optical effects, low refractive index dispersion, stable physical and chemical properties, and excellent mechanical properties, making them suitable for use in deep-ultraviolet quasi-phase-matched optical devices.

The invention relates to a double-pyrazoline structure sensitizer as well as a preparation method and application thereof. The double-pyrazoline structure sensitizer disclosed by the invention has a structure as shown in a formula (1). The bipyrazoline structure sensitizer has a wide UV absorption spectrum, and is strong in absorption, more excellent in photosensitive activity and good in solid form. Besides, the flexibility of the two pyrazoline groups is adjusted by introducing an ether bond and an additional alkoxy structure, so that on one hand, the designed molecular solid form is ensured to be good, and on the other hand, the compatibility in a photocuring system is ensured to be good. The photocuring composition containing the photocuring composition has excellent photosensitivity and developability, and the cured composition has good resolution and strong adhesive force.

Disclosed in certain embodiments is a coating composition and coating formed therefrom comprising a solvent, a binder, a UVA absorbing compound, and photonic particles such as porous metal oxide particles, hybrid metal oxide particles, closed-cell metal oxide particles, or a combination thereof. The coating compositions form a coating that exhibits a UV attenuation boost.

The present invention discloses a flame-retardant, UV-resistant polyvinyl alcohol (PVA) composite film and a preparation method thereof. Based on the coordination interaction between ions and metal-ligands, the flame-retardant, UV-resistant agent DAD@Ni is prepared using 4,4-diaminodiphenyl sulfone, p-aminobenzenesulfonic acid, diethylenetriaminepenta(methylenephosphonic acid), and nickel nitrate. The flame-retardant, UV-resistant agent is added to a PVA system to produce a PVA composite film that is flame-retardant, UV-resistant, transparent, and has excellent mechanical properties. DAD@Ni exhibits a good flame-retardant effect in PVA. Furthermore, because 4,4-diaminodiphenyl sulfone and p-aminobenzenesulfonic acid contain a large number of aromatic rings, the conjugated system undergoes a π-to-π* conversion upon energy absorption, significantly enhancing the UV absorption capacity of the PVA composite film.

Provided is an ozone-containing mist production device capable of increasing the content of ozone held by mist droplets and effectively transporting the ozone into a spray space by discharged ozone-containing mist. When the ozone concentration measured by an ultraviolet absorption method is an ozone concentration A in a first liquid, the ozone concentration measured by a diethyl-p-phenylenediamine method is an ozone concentration B in a second liquid, the value obtained by subtracting the ozone concentration B in the second liquid from the ozone concentration A in the first liquid is an ozone concentration C=A-B in a difference liquid, and the ratio of the ozone concentration C in the difference liquid to the ozone concentration A in the first liquid is an ozone concentration ratio C / A in the difference liquid, water having an ozone concentration A in the first liquid of at least 1 ppm and an ozone concentration ratio C / A in the difference liquid of at least 20% and at most 200 μm is used as ozone-containing water serving as a raw material of ozone mist. Consequently, the content of ozone held by mist droplets can be increased, and the ozone can be effectively transported into a spray space by discharged ozone-containing mist.

Provided are a composition for UV absorption that has a superior UV absorption function, and is superior in dispersibility while absorbing, in particular, UVA (wavelength: 315 to 380 nm) and UVB (wavelength: 280 to 315 nm), a method for manufacturing the same, and a UV absorption method using the same. The composition for UV absorption includes a carbon-based quantum dot, an aqueous solvent, a surfactant, and an oily base. Alternatively, the composition for UV absorption includes a carbon-based quantum dot, an aqueous solvent, and a hydrophilic base. The method for manufacturing a composition for UV absorption includes a step of mixing an aqueous dispersion containing a carbon-based quantum dot and an aqueous solvent, a surfactant, and an oily base. The method for manufacturing a composition for UV absorption includes a step of mixing an aqueous dispersion containing a carbon-based quantum dot and an aqueous solvent, and a hydrophilic base.

The invention relates to a preparation method of a high-barrier PET packaging material, and belongs to the technical field of packaging materials. The high-barrier PET packaging material is prepared by taking terephthalic acid, ethylene glycol, a polymerization catalyst, trimethyl phosphate, a cross-linking agent and an ester exchange catalyst as raw materials, the cross-linking agent is firstly prepared, PET is modified in an ester exchange link, and a strong electron withdrawing group is introduced into a PET molecular chain to improve the polarity of the PET molecular chain, so that the high-barrier PET packaging material is prepared. Compared with the prior art, the cross-linking agent disclosed by the invention has the advantages that the cross-linking agent is capable of weakening the interaction with oxygen and carbon dioxide, inhibiting the chain segment movement among PET molecules, promoting the polymer to form a closer chain segment stacking structure, effectively improving the gas barrier property of PET and improving the ultraviolet absorption property of a PET material, and in addition, the cross-linking agent disclosed by the invention is not easy to migrate and still has good stability during processing.