40results about How to "Raise the polymerization temperature" patented technology

The invention discloses a method for preparing an acrylonitrile / methacrylic acid copolymer foam plastic, which comprises the following steps: adding deionized water, a suspending agent and a water-phase polymerization inhibitor into a reaction vessel, and stirring evenly; After the nitrile, methacrylic acid and initiator are mixed evenly, add to the reaction vessel, and stir at room temperature to obtain a stable suspension, heat up to the reaction temperature, and carry out free radical suspension polymerization reaction under the condition of stirring again; the slurry obtained after the reaction The mixture is dried; after drying, the obtained copolymer powder, carbonamide foaming agent, and bismaleimide (BMI) crosslinking agent are mixed evenly; the obtained mixture is hot-pressed and foamed, and heat-treated to obtain polymethacrylic Amine foam. The technical scheme of the invention has high production efficiency, high yield, stable product performance, simple and convenient operation, and environmental friendliness, thereby obtaining beneficial implementation effects.

The invention discloses an inflaming retarding interface modifier and a preparation method thereof, and an inflaming retarding polycarbonate composite. The inflaming retarding interface modifier comprises two parts, namely high phenyl polysilsesquioxane and polyacrylate which are combined through a vinyl free radical polymerization reaction. The preparation method comprises: the emulsion copolymerization of high phenyl polysilsesquioxane, acrylic esters, and methacrylate in turn, and the emulsion breaking and drying. The inflaming retarding polycarbonate composite comprises: 97.8 to 99.3 massportions of polycarbonate, 0.1 to 1.0 mass portion of the inflaming retarding interface modifier, 0.05 to 1.0 mass portion of fluoro-resin, and 0.05 to 1.0 mass portion of organic sulphonate. The total dosage of the three flame retardants is 0.5 portion; and the polycarbonate composite spline with the thickness of 1.6mm can be enabled to reach the UL94V-0 grade. The composite can be used for preparing all kinds of office automation equipment, electronic and electric equipment and so on.

The invention discloses a method for producing sodium tripolyphosphate without chloride or fluoride. The method comprises the following steps: firstly, neutralization reaction: adding water into a neutralization pot for heating, and adding sodium carbonate for stirring until the sodium carbonate is completely dissolved; when the temperature of a solution is raised to 90 to 120 DEG C, slowly addingphosphoric acid while stirring and adjusting the K value of neutralizing slurry to 2.8+ / -0.2; then adding silicon dioxide, continuously reacting for 3.5+ / -0.5 hours until a mixed solution is viscous,and filtering to obtain a viscous slurry for later use; secondly, drying and dehydrating: feeding the viscous slurry obtained by neutralization into a drying tower for atomization and dehydration; thirdly, polymerization and generation: carrying out polymerization reaction on dried and dehydrated raw materials to obtain the sodium tripolyphosphate; fourthly, carrying out alkali wash on tail gas contained hydrogen chloride, hydrogen fluoride and silicon tetrafluoride and emptying after the substances are determined to be qualified by detecting. The production method of the sodium tripolyphosphate, provided by the invention, has the advantages that the cost of the raw materials is low, the process is simple, the industrialization is easy to realize and the raw materials are easy to obtain;the obtained sodium tripolyphosphate does not contain the chloride or the fluoride.

The invention relates to a solution method for synthesizing butyl rubber. A mixture of C4-C8 monoolefine monomers and C4-C14 polyene hydrocarbon monomers is taken as a raw material, and in a system that hexane and chloromethane are solvents, polymerization reaction is initiated by an initiating system to prepare butyl rubber polymer, wherein the reaction pressure is normal pressure, the reaction temperature ranges from 0 to -90DEG C, and the initiating system has the concentration of 0.01-0.001mol / L, and is prepared by dissolving a main initiator, namely deionized water and a coinitiator, namely aluminum alkyl dihalide by using a polar solvent CH2Cl2 for mixing, and adding alkylol amines; the molar ratio of the coinitiator to the main initiator is 1:1-10:1, and the molar ratio of a third component to the main initiator is 1:10-1:25; and the adding amount of the mixed solvent is 1 to 50 times volume of the polymerization monomers. According to the method, reaction is mild, polymerization temperature is improved, the stability and initiation efficiency of the initiators are high, and the molecular weight distribution of the product is narrow.

The invention provides a supported metallocene catalyst which comprises a carrier, and an alkylaluminoxane / magnesium chloride complex and a metallocene compound which are supported on the carrier; the carrier is spherical mesoporous silica, wherein the carrier has an average particle diameter of 20-80 microns, a specific surface area of 550-650 square meter / g, a pore volume of 0.4-1.2 ml / g, and a most probable pore size of 1-7 nanometers; the metallocene compound has a structure as shown in formula 1. When the supported metallocene catalyst of the invention is used for catalyzing olefin polymerization, the catalytic efficiency for homopolymerization at 70 DEG C is up to 2.3*10<8> gPE / (mol Zr.h), and the catalytic efficiency for copolymerization at 70 DEG C is up to 2.2*10<8> gPE / (mol Zr.h); the supported metallocene catalyst overcomes the defect of kettle adhesion, has a low polymerization temperature, and thus reduces the energy consumption to some extent.