2results about How to "Significant performance improvement" patented technology

The application discloses a preparation method and application of a graphene modified three-layer composite weather-resistant garden floor, and belongs to the technical field of building materials. The floor comprises, from top to bottom, a graphene reinforced wear-resistant decorative layer, a graphene modified wood-plastic composite base layer and a graphene moisture-proof balance bottom layer. The floor has excellent weather resistance, water resistance, wear resistance, ultraviolet aging resistance, slip resistance and size stability, and also has good mildew resistance and antibacterial performance. In terms of weather resistance, the bending strength retention rate after 300h xenon lamp aging is over 90%. In terms of slip safety, the wet-state slip coefficient is 0.68-0.75, far exceeding the compulsory safety standard of garden walkways. In terms of mildew resistance and antibacterial performance, the antibacterial rate is greater than or equal to 99%, and the mildew resistance grade is 0, thereby avoiding problems such as mildew and blackening on the surface of the floor. The floor is suitable for ground paving of outdoor garden landscape places such as parks, scenic spots, courtyards and waterfront walkways.

The present invention relates to the technical field of high-temperature energy storage dielectric films, and discloses a preparation method of a porphyrin cross-linker modified polyimide high-temperature energy storage dielectric film. Polyamic acid (PAA) precursor is obtained by condensing 4,4'-diaminodiphenyl ether (ODA) and pyromellitic dianhydride (PMDA), and introducing ultra-low content of 5,10,15,20-tetrakis(4-aminophenyl)porphyrin (TAPP) as a cross-linker. Cross-linked polyimide film (PCPI) is prepared by solution coating and gradient thermal imidization. The terminal amino groups of TAPP molecules form a covalent cross-linking network with PAA, and the porphyrin macrocycle π-conjugated system provides deep-level charge traps, significantly inhibiting high-temperature carrier migration. The breakdown strength of the optimal sample PCPI-0.1 reaches 475 MV / m at 200 °C, and the discharge energy density is 4.97 J / cm 3 , the charge-discharge efficiency is ≥85%. At the same time, it has a high glass transition temperature, high thermal stability, excellent cycle stability and film-forming uniformity. The solution coating process is simple to prepare, and the process conditions are simple and controllable, which is suitable for the batch production of high-temperature and high-energy storage polyimide dielectric films.