8 results about "UV degradation" patented technology

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.

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.

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.

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.