6results about How to "Fast polymerization rate" patented technology

The invention belongs to the field of liquid crystal polyarylester synthesis, and particularly relates to a liquid crystal polyarylester synthesis method and application of a high-boiling-point imidazole catalyst in synthesis of the liquid crystal polyarylester, and the synthesis method comprises the following steps: under the protection of nitrogen, mixing a monomer, an acylation reagent and a catalyst according to a certain proportion, heating, and carrying out acetylation and melt polycondensation to obtain a liquid crystal polyester melt; and cooling to obtain a liquid crystal polyarylester finished product. According to the liquid crystal polyester synthesis method provided by the invention, the specific high-boiling-point imidazole catalyst is selected and can be continuously and efficiently used for synthesizing liquid crystal polyarylester, so that acetylation reaction can be effectively catalyzed, melt polycondensation reaction can be continuously and efficiently catalyzed, the reaction time of polycondensation is greatly shortened, and side reactions are reduced.

The present invention provides a polyether prepared by polymerizing alkylene oxide in the presence of an initiator, an aluminum compound having at least one hydrocarbyl substituent, and a phosphorus-nitrogen base. The molar ratio of the amount of the phosphorus-nitrogen base present to the amount of the initiator is small. The presence of such a small amount of phosphorus-nitrogen base greatly improves the catalytic activity of the system compared to the case where the aluminum compound is used alone. The product polyether has a small amount of unsaturated polyether impurities and little or no unwanted high molecular weight portion. The proportion of primary hydroxyl groups of the propylene oxide polymer is very low.

The invention provides a fiber composite material winding bottle and a preparation method thereof, the fiber composite material winding bottle comprises an inner layer, a middle layer and an outer layer from inside to outside, the inner layer is composed of a nylon fiber composite material layer, the middle layer is composed of a carbon fiber composite material layer, and the outer layer is composed of a carbon fiber composite material layer. The outer layer is composed of a glass fiber composite material layer or a carbon fiber composite material layer. The inner layer, the middle layer and the outer layer of the winding bottle are made of different fiber materials according to the actual requirements of different layers of the winding bottle, and the thermoplastic liner-free hydrogen storage bottle which is high in strength, high in interlayer binding force, high in preparation efficiency and capable of being effectively recycled is prepared.

The utility model relates to extrusion granulation technical field especially relates to a kind of nanometer material compression granulation equipment, including base, the upper surface of base is fixedly installed with stand, the top of stand is fixedly installed with compression box, and the top of compression box is fixedly installed with material hopper, rotation is installed in the compression box with shaft, and the outer wall of shaft is fixedly installed with the stirring rod of equidistance annular distribution, first auger rod is also rotationally installed in the compression box, and first auger rod is located below the shaft, the outer wall of one side of compression box is fixedly installed with auger cylinder, and the end of first auger rod is located in auger cylinder. The utility model has obvious advantages, spraying and stirring synergistic accelerate material polymerization;First auger rod realizes preliminary extrusion plastic forming, densification;Second auger rod completes secondary extrusion with extrusion cylinder, accurately controls granule quality;Granulation mechanism can flexibly adjust granule size shape, high efficiency and stability, satisfy multi-field demand.

The application discloses a kind of solventization electron initiation controlled radical polymerization method of cosolvent regulation, this polymerization method uses higher polymerization temperature and adds cosolvent tetrahydrofuran simultaneously to regulate, solventization electron initiation polymerization still can keep the nature of controlled radical polymerization, can prepare molecular weight precision controllable, narrow molecular weight distribution polymer, and accurate structure block, star and various topological structure polymers such as polymer.The solventization electron initiation controlled radical polymerization method of cosolvent regulation of the application, it includes the following steps: in the solventization electron initiation polymerization system of alkali metal lithium / hexamethylphosphoramide to olefin monomer, adding cosolvent, carrying out controlled radical polymerization, improve polymerization rate and obtain narrow molecular weight distribution polymer;Wherein, the cosolvent is tetrahydrofuran, the dosage of hexamethylphosphoramide is 20mL, the dosage of tetrahydrofuran is 3-6mL, and the polymerization temperature is 50-60 DEG C.

The present application relates to a kind of preparation method of metallocene polyethylene of wide molecular weight distribution, belong to olefin polymerization catalysis technical field.The preparation method of metallocene polyethylene of wide molecular weight distribution provided by the present application includes the following steps: (1) mixed metallocene catalyst, organic aluminum compound and mixed solvent, heating, and into ethylene is carried out polymerization reaction;The mixed solvent includes organic solvent A and organic solvent B, the organic solvent A is inert alkane or aromatic hydrocarbon, and the organic solvent B is the organic solvent containing polar functional group;(2) after reaction, quenching agent is added to terminate the reaction, washing, filtration, drying, it is finished.The present application uses mixed solvent system, and the use amount and the ratio of two components of mixed solvent are adjusted to realize the adjustment of metallocene polyethylene molecular weight distribution, greatly reduce the requirement of complex bifunctional catalyst, catalyst cost is low, polymerization process is simple, product performance is flexible, and application prospect is wide.