34results about How to "Meet the requirements of high temperature use" patented technology

The invention relates to a proton exchange membrane and preparation method thereof, and the proton exchange membrane is a Poly-p-phenylene ben-zobisthiazole and polyphosphoric acid blend membrane (PBO / PPA), and the method for preparing the Poly-p-phenylene ben-zobisthiazole and polyphosphoric acid blend membrane (PBO / PPA) as a proton exchange membrane comprises: (1) polymerizing and obtaining a PBO / PPA slurry; (2) preparing the PBO / PPA slurry into a PBO / PPA proton exchange membrane; (3) controlling the thickness of the membrane by controlling the concentration of the polymer solution and the compacting temperature and pressure; (4) carrying out a proton conductivity test directly after the membrane is taken out and the membrane is used as a proton exchange membrane is assembled in the H2 / O2 fuel monocell for investigating power generation performance. The invention selects an appropriate film forming technology according to the characteristic of the PBO rigid molecular chain, and has the advantages of simple preparation technology and easy control, and the obtained proton exchange membrane has a higher proton conductivity under high temperature with excellent power generation property.

The invention provides a solar spectrum selective absorbing coating and a preparation method thereof, wherein the preparation method comprises the following steps of: (1): selecting copper or stainless steel as substrate material; (2): selecting high-temperature oxidation resisting TiAlN as a diffusion impervious layer, using pure metal Cu or Al as a high infrared reflective layer, wherein an absorbing layer consists of two conductive particle-ceramic (AlN) composite layers with different volume percentages of metal nitride conductive particle (TiAlN), using AlN as an antireflection layer, and using SiO2 as a protective layer; (3): controlling components and contents of different film materials by controlling the gas flow and the sputtering power and the like; (4): before placing the substrate material into a vacuum chamber, carrying ultrasound treatment on the substrate material for 10-30 min, drying, after placing the substrate material into the vacuum chamber, roasting for 10-30 min at 100-120 DEG C, before sputtering, bombarding the surface by argon ions; and (5): obtaining a coating with a multi-layer structure, which has high absorption rate Alpha (0.95 + / - 0.02) in the solar spectral region (0.3-2.5 micrometers), and which has quite low emissivity Epsilon (0.04 + / - 0.01) in an infrared region (2.5-50 micrometers).

The invention relates to a preparation method of polyimide paper. The method includes the steps: (1) performing surface treatment for polyimide chopped fibers and polyimide fiber pulp; (2) dispersing products obtained in the step (1) in water solution with dispersing agents; (3) sequentially performing papermaking, rolling and drying products obtained in the step (2); (4) dipping or coating the surfaces of the products obtained in the step (3) with solution or dispersing liquid of resin binders. The invention further relates to polyimide paper prepared by the method. According to the method, the polyimide fibers and the polyimide fiber pulp directly serve as raw materials, and the method can solve the problems that the polyimide fibers need to be used instantly after preparation as the polyimide fibers are degraded when being stored for a long time, and inner stress of paper surfaces is generated as shrinkage ratio is excessive when the polyimide fibers are imidized and formed. The polyimide paper prepared by the method sufficiently keeps good high-temperature resistance and insulation performance of polyimide materials and has good mechanical strength.