9 results about "Propylene oxide" patented technology

The invention specifically relates to a fused aza-heterocyclic aromatic hydrocarbon porous framework of a two-dimensional lamellar structure, and a preparation method and application thereof, belonging to the technical field of functional materials. According to the invention, aza-heteropolycyclic aromatic hydrocarbon is synthesized on the basiss of cyclization of a diamino group and a diketo group for formation of phenazine and is used as a monomer; and then aza-heteropolycyclic aromatic hydrocarbon is subjected to the Scholl reaction under the catalysis of a Lewis acid salt so as to allow aza-heteropolycyclic aromatic hydrocarbon to undergo homopolymerization at high temperature and low pressure, so a conjugated polymer material of a microporous structure and with two-dimensional lamellar layers for complex catalysis of metal is produced. The two-dimensional material has the characteristics of a high specific surface area, a full conjugate plane structure, heat stability, resistance to acid and alkali, excellent catalytic activity, high recovery rate, etc. The method provided by the invention is simple to operate and controllable in process; and the prepared material can be used for catalyzing a cycloaddition reaction of CO2 with epoxypropane compounds so as to immobilize CO2 and has good application prospects.

The invention provides continuous production equipment and a continuous production process for a hexafluoropropylene oxide oligomer. The continuous production equipment comprises a stirring kettle anda liquid phase separation kettle, wherein a stirrer is arranged in the stirring kettle; a discharge pipe is arranged at the bottom of the stirring kettle; a discharge pipe is arranged at the bottom of the liquid phase separation kettle; the discharging pipe is communicated with the discharge pipe through a feeding pipe; the feeding pipe is provided with a conveying pump; the top of the stirring kettle is communicated with the top of the liquid-phase separation kettle through a liquid-phase circulating pipe and a gas-phase circulating pipe respectively; the liquid-phase circulating pipe is provided with a circulating pump; the gas-phase circulating pipe is provided with a condenser; one end of the liquid-phase circulating pipe, which is positioned at the liquid-phase separation kettle, extends into the lower part of the liquid-phase separation kettle; and one end of the liquid-phase circulating pipe, which is positioned at the stirring kettle, is connected with a nozzle. The equipmentand the process have the advantages of continuous production, simplicity in operation, high production efficiency, stable product quality and the like, meanwhile, the catalyst, the solvent and byproducts can be recycled, and the process is low in cost and environmentally friendly.

The invention discloses a preparation method and an application of low-dielectric loss piezoelectric ceramic materials. The method includes the steps: mixing silicon nitride, aluminum oxide and molybdenum disulfide, ball-milling mixture and placing the ball-milled mixture into ethylene glycol; adding bisphenol-A epoxy resin, strontium zirconate and polyether propylene oxide, and stirring and heating mixture to obtain thermal reaction mixed liquid; ageing the thermal reaction mixed liquid, adjusting pH (potential of hydrogen) of the mixed liquid, and drying the mixed liquid to obtain ceramic slurry; performing curing and demolding on the ceramic slurry in molds to obtain blanks; sintering the blanks to obtain the low-dielectric loss piezoelectric ceramic materials. The prepared low-dielectric loss piezoelectric ceramic materials are high in mechanical quality factor and electromechanical coupling coefficient and low in dielectric loss and have good application prospects in electronic device products.