17 results about "UV degradation" patented technology

Composite material protection from UV degradation is disclosed by providing a co-cured composite material substrate co-cured with a UV / visible light-resistant fiberglass layer to form co-cured composite materials for exclusively imparting UV / visible light-resistant properties to co-cured composite material substrates for use in UV / visible light-resistant vehicle fuel tank assemblies.

The application discloses a kind of ultraviolet absorber with triazine ring as main structure and its preparation method and its application in aramid fiber, the ultraviolet absorber has the following structural formula: Wherein, R1, R2, R3, R4 It is the group containing phenyl or substituted phenyl, R5 It is piperidyl, piperazyl, pyrrolidinyl and one of the following structures:This ultraviolet absorber has good absorption to UVA-UVB band ultraviolet, especially in 290~320 nm range has good ultraviolet absorption, adding the ultraviolet absorber in aramid fiber can significantly improve its weather resistance and service life, keep mechanical property, delay ultraviolet degradation, reduce the direct damage of fiber.

The invention discloses sargassum fusiforme polysaccharide with a barrier repairing function and a preparation method and application thereof. The molecular weight of the sargassum fusiforme polysaccharide is 39-278 kDa, the total sugar content is 50-55 wt%, and the uronic acid content is 29-35 wt%. The preparation method comprises the following steps: (1) hot water extraction: mixing sargassum fusiforme powder with water, and performing hot water extraction, evaporation concentration, alcohol precipitation and freeze-drying; (2) ultrasonic treatment: mixing with water, and performing ultrasonic degradation; and (3) UV / H2O2 degradation: mixing with a H2O2 solution, carrying out UV degradation, removing H2O2, dialyzing, evaporating and concentrating, and freeze-drying to obtain the product. The sargassum fusiforme polysaccharide prepared by the invention can significantly improve the content and expression of filagarisin (FLG) of nude mice and HaCaT cells after UVB irradiation, reduces the percutaneous moisture loss value (TEWL) in nude mice, has a significant skin barrier repair function, and can be used for development and utilization of functional foods and skin care products.

The present invention provides a method of controlling UV degradation of a compound of formula (I) wherein R is alkyl or alkylaryl; each of X1, X2, X3, X4 and X5 is independently H, an alkyl group, an alkenyl group, an alkynyl group, an alkoxy group, a haloalkyl group, a haloalkoxy group, an alkylthio group, a haloalkylthio group, an amino group, an alkylamino group, a dialkylamino group, an alkoxycarbonyl group, an alkylcarbonyl group, a hydroxyalkyl group, an ester, a haloid acid,-SH,-OH,-NH2,-NO2,-CN or CF3; y is O or S; and Z is halogen, comprising protecting the compound of formula (I) from UV light.

This invention belongs to the field of solar cells, specifically relating to a method for improving the uniformity of alumina thin film deposition in the atomic layer of back-contact solar cells. The method involves double-sided alkaline polishing of silicon wafers using a cleaning machine to create a mirror-like structure. Then, using automated equipment, the double-sided polished silicon wafers are fed into the ALD (Alternating Layer Deposition) system cavity via alternating insertion of trimethylaluminum and water vapor, depositing a thin alumina film on both the front and back sides of the silicon wafer. This invention requires no equipment modification; by adjusting the process and increasing the gap between the upper and lower aluminum boats, it improves the uniformity of alumina thickness, enhances cell passivation stability, reduces the defect rate, thereby increasing cell efficiency and reducing the risk of UV degradation.

Maintenance of a ground-covering tufted geosynthetic having a backing (14) and a plurality of tufts (18) of simulated grass blades defining respective interstices (22) that receive an infill (26) of particles, inspecting to identify an elongated wrinkle (30) formed during covering use thereof, said elongated wrinkle having opposing sides and a distal apextural extent, from which infill migrates exposing said backing in an opening to ambient light, and applying a protective coating (46) in said opening attached to an upper surface of the backing and preferably comprising a UV protectant material for blocking UV rays from ambient light, whereby UV degradation of the backing is reduced.

The invention relates to a large-trunk-diameter fruit tree bark grafting method for sealing and fixing by using polystyrene foam, which comprises the following steps: wrapping a thin plastic film on the cross section of a trunk of a stock to effectively isolate external air and moisture, prevent invasion of germs and reduce water loss; the plastic film can effectively prevent polystyrene foam in later construction from invading a grafting interface, and the problem that interface healing is blocked due to pollution is solved. After the scion is inserted through the marked grafting point, the grafting position of the scion and the stock is fixed through polystyrene foam, a stable protection layer is formed after the polystyrene foam is cured, the joint healing quality is effectively improved, and meanwhile the scion fixing strength is enhanced. The protective layer has good heat preservation and moisture preservation performance, and cambium cell division and healing tissue generation are promoted. After the polystyrene foam is completely cured, the outside is wound and wrapped by a shading film, so that ultraviolet degradation is avoided, and water evaporation is reduced. The whole grafting structure is stable, resistant to wind and rain erosion and suitable for efficient standardized operation of large-scale orchards, and the technical threshold and the labor cost are remarkably reduced.

Composite material protection from UV degradation is disclosed by providing a co-cured composite material substrate co-cured with a UV / visible light-resistant layer to form co-cured composite materials for exclusively imparting UV / visible light-resistant properties to co-cured composite material substrates for use in UV / visible light-resistant vehicle fuel tank assemblies.

The invention relates to the technical field of high polymer materials, and discloses an anti-ultraviolet degradation film for seed corn and a preparation method thereof.The preparation method comprises the following steps that poly (butylene adipate-co-terephthalate), polylactic acid, barrier master batches, modified benzophenone, an ultraviolet light absorber, an antioxidant 1010 and stearic acid are put into a high-speed mixer to be mixed for 20-40 min at the speed of 2000-3000 rpm, and a mixture is obtained; the preparation method comprises the following steps: mixing the raw materials to obtain a primary mixed material, adding the obtained primary mixed material into a double-screw extruder, extruding and granulating at 140-160 DEG C, then putting the obtained master batch into a film blowing machine, and carrying out film blowing molding at 160-190 DEG C to obtain the ultraviolet-proof degradable film for the corn for seed production. The degradable film disclosed by the invention has good anti-ultraviolet performance and antibacterial performance.

The invention relates to a gallic acid composition free of ultraviolet degradation and a preparation method and application thereof, and belongs to the technical field of daily chemical products. The gallic acid composition disclosed by the invention is prepared from quercetin-3-O-glucoside and diglucosyl gallic acid. The quercetin-3-O-glucoside can block the attack of ultraviolet rays on the catechol structure of the diglucosyl gallic acid through steric hindrance and a hydrogen bond network, so that the diglucosyl gallic acid can be prevented from being degraded by the ultraviolet rays, not only is the photosensitivity defect of the diglucosyl gallic acid overcome, but also the whitening and freckle removing effects are multiplied through a synergistic interaction mechanism, and the whitening and freckle removing effects are improved. A breakthrough technical path is provided for developing the light-stable plant source whitening agent.

This application provides a method for fabricating a multilayer silicon oxide anti-UV degradation film structure solar cell, relating to the field of solar cells. The method includes sequentially arranging the following layers in the P+ direction of an N-type crystalline silicon substrate: a first silicon oxide layer, a boron-doped layer, a first aluminum oxide layer, a second silicon oxide layer, a second aluminum oxide layer, a third silicon oxide layer, a first silicon nitride antireflection layer, and a fourth silicon oxide layer; and sequentially arranging the following layers in the N+ direction of the N-type crystalline silicon substrate: a fifth silicon oxide layer, a phosphorus-doped layer, and a second silicon nitride antireflection layer. The fabrication method of the multilayer silicon oxide anti-UV degradation film structure solar cell provided by this application has high controllability and repeatability, and can precisely control the thickness and refractive index of the film layers. Simultaneously, the relatively low price of multilayer silicon oxide materials helps reduce the fabrication cost of the cell, promoting the application and promotion of photovoltaic technology in a wider range of fields.

This invention relates to the technical field of TPU, and more specifically to a TPU high-temperature film having an optical color effect and a method for manufacturing the same. The TPU high-temperature film having an optical color effect comprises, from top to bottom, an optical coating layer, a texture layer, a TPU carrier layer, and a hot-melt adhesive layer, wherein the texture layer is manufactured with a polyurethane UV adhesive coating. The TPU high-temperature film has stable quality and excellent tensile strength, resistance to UV degradation, resistance to hydrolysis, and resistance to boiling water, while its optical coating layer also has good adhesion, resistance to hydrolysis, resistance to boiling water, and resistance to degradation, making it easy to use. The method for manufacturing the TPU high-temperature film is simple in process, easy to control, and useful for large-scale industrial production. Furthermore, since no waste, wastewater, or exhaust gases are generated during the production process, it does not pollute the environment and contributes to human environmental protection.

The invention relates to the field of bio-based buoy materials, in particular to a self-degradable bio-based buoy material for a navigation channel and a preparation method of the self-degradable bio-based buoy material. The invention discloses a self-degradable bio-based buoy material for a navigation channel. The self-degradable bio-based buoy material comprises the following substances in parts by weight: 60-70 parts of a polylactic acid monomer; 20 to 40 parts of a polyhydroxyalkanoate monomer; 1 to 5 parts of an anti-ultraviolet degradable bio-based monomer; 0.1 to 1.0 part of a functional auxiliary agent; the anti-ultraviolet degradable bio-based monomer is an esterified derivative of ferulic acid and ethylene glycol diglycidyl ether. A composite component system of the polylactic acid monomer, the polyhydroxyalkanoate monomer and the anti-ultraviolet degradation type bio-based monomer is constructed, and the anti-ultraviolet degradation type bio-based monomer is an esterification derivative of ferulic acid and ethylene glycol diglycidyl ether, so that the core pain point of weak anti-ultraviolet degradation capability of a traditional bio-based material is solved; and meanwhile, the base body is stable in structure, can adapt to the outdoor use environment of the channel buoy, and gives consideration to both practicability and environmental friendliness.

The utility model relates to the technical field of TOC degradation, in particular to a continuous flow ultraviolet degradation trace TOC device which comprises an outer box, a degradation pipe is fixedly installed in the outer box, the two ends of the degradation pipe penetrate through the outer box and extend to the outer portions of the two sides of the outer box respectively, and the degradation pipe is made of transparent materials. A plurality of first ultraviolet lamp tubes which are uniformly distributed at equal intervals are arranged on the outer side of the degradation tube in the outer box. According to the device for degrading trace TOC through continuous flow ultraviolet rays, through cooperative use of the outer box, a first mounting opening, a first mounting block, a degradation pipe, a pull ring, a limiting seat, a first ultraviolet lamp tube, a spring, a limiting groove, a limiting block, a positioning groove, a fixing hole, a fixing rod and a sliding rod, in the whole degradation process, due to the spiral shape feature of the degradation pipe, the flow distance is increased, and the degradation effect is improved. In this way, the flow speed can be effectively reduced, and water can have sufficient time to make contact with ultraviolet lamp light emitted by the first ultraviolet lamp tube.

The invention belongs to the technical field of biological detection, and particularly relates to a nucleic acid detection module and method based on CRISPR (clustered regularly interspaced short palindromic repeats) and light-operated electrochemistry. The nucleic acid detection module comprises an insulating substrate, metal electrodes arranged on the insulating substrate, a two-dimensional sensitive material arranged on the insulating substrate and located between the electrodes, and a sample groove covering the two-dimensional sensitive material between the electrodes, the surface of the two-dimensional sensitive material is modified with a single-chain biological probe through a chemical bond or an intermolecular force; complementary sequences of PC-Linker molecules uniformly modified with ultraviolet degradation characteristics are introduced into a CRISPR / Cas12a and crRNA compound system, the cleavage activity of CRISPR / Cas12a is effectively controlled through light-controlled electrochemistry under the conditions of no purple light illumination and existence of ultraviolet light illumination, the detection accuracy of 98% or above of nucleic acid markers of various cancers is achieved, and the method can be used for disease diagnosis, clinical diagnosis and the like. The method has potential social and economic values.

The invention provides an OCA (Optical Clear Adhesive) curing method which comprises the following steps: arranging a UV (Ultraviolet) degradation dye or an aggregation-induced emission material on the surface of a first element, coating OCA, arranging a second element on the surface of the OCA, and applying a UV light source for curing, uV energy required by degradation of the UV degradation dye is consistent with UV energy required by curing of the OCA; or determining UV energy required for curing the OCA according to the luminescence property of the aggregation-induced emission material, wherein the luminescence property of the aggregation-induced emission material comprises one or more of fluorescence spectrum, fluorescence intensity and fluorescence brightness. According to the method provided by the invention, whether the curing energy of the OCA reaches the standard or not can be detected in an online visual manner or through fluorescence detection equipment, independent detection is not needed in the curing process, working procedures do not need to be added, and materials do not need to be disassembled to be wasted.

This application relates to the field of solar cell technology, specifically disclosing a front-side film layer for solar cells with anti-UV degradation effect and its preparation method. The front-side film layer includes an anti-reflection layer and a stacked alumina layer, with the anti-reflection layer located outside the stacked alumina layer; the anti-reflection layer includes a low-bandgap, high-refractive-index silicon nitride layer; the stacked alumina layer (2) includes a low-hydrogen-content alumina layer, which is deposited using an ALD process, wherein the low-hydrogen-content alumina layer is obtained by reducing the water flux and / or water pulse time during the deposition process. The low-bandgap, high-refractive-index silicon nitride layer of this application captures and absorbs the energy of UV photons, reducing UV damage to the silicon substrate interface, while the low-hydrogen-content alumina layer blocks the diffusion of active hydrogen to the silicon substrate interface; through the synergistic effect of the film layers, the anti-UV degradation performance is improved while ensuring photoelectric conversion efficiency.