465results about How to "Particles in good shape" patented technology

The invention discloses a loading non-metallocene single active central catalyst composition which is obtained through adopting an alkyl aluminoxane / magnesium chloride / silica gel carrier as a carrier and loading a non-metallocene single active central transition metal composition and a preparation method thereof. The catalyst system consisting of the catalyst composition catalyzes ethylene to polymerize or copolymerize and has high polymerization activity. The carrier is simple to prepare; the prepared loading catalyst granule has good shape and adjustable size; and the obtained polythene powdery material has high stacking density.

Solid catalyst components and catalysts which contain (a) magnesium compound, (b) titanium tetrachloride, and (c) a phthalic acid diester or its derivative are useful in the synthesis of olefin polymers in high yields. Particularly, propylene polymers can be obtain in very high yields while retaining high stereoregularity.

The invention relates to a catalyst component used for olefin polymerization, specially for propylene polymerization or copolymerization, in particular to a novel spherical alcohol adduct containing ternary components of magnesium halide, alcohol and polyether as well as the application of the alcohol adduct in the preparation of olefin polymerization catalyst. When the catalyst prepared by taking the alcohol adduct as a carrier is used for olefin polymerization, especially for propylene polymerization, better polymerization activity, good polymer grain forms and less fine powders are shown. The invention is used in the field of petrochemical industry.

This invention relates to a catalyst system which is used for alkenes polymerizing or copolymerization, it includes solid catalyst composition A that contains titanium and organic Aluminum compound B, silicoorganic compound C, in the composing process of catalyst composition A, use aldyl ester of aryl group mon-carboxylic acid and aldyl ester of fatty series or multielement carboxylic acid of aryl group for reasonable combination, among them aldyl ester of aryl group mon-carboxylic can play a role of assisting separating agent, it is useful to separate catalyst particle; Meanwhile it is used as electron donor, it also can load on the surface of catalytic agent together with compound of multielement carboxylic esters, improve the surface structure of catalytic agent, thus improve the catalyzing function of catalytic agent. This catalytic agent that is used for propylene polymerizing has high catalytic activity and anti- impurity function, particle appearance of catalytic agent is good, particles distribute narrowly, hydro-adjusting function of catalytic agent is good, it is useful for many polymerizing technology such as seriflux method, noumenon method and gas method, molecular weight distribution of polymer is narrow, particle appearance of polymer is good, fine grits is little; Its fine anti-impurity function can effectively reduce production cost.

The invention provides a method for preparing a catalyst component for the polymerization reaction of olefins, which comprises the following steps: (1) dissolving magnesium halide in a solvent system comprised of an organic epoxy compound, an organic phosphorus compound and an inert diluent to form uniform solution; (2) mixing a titanium compound with the uniform solution formed by the step (1) and adding a precipitant to form a mixture, or adding the precipitant into the uniform solution formed by the step (1) first and mixing the uniform solution with the titanium compound to form a mixture; and (3) heating the mixture obtained by the step (2), adding any selected electronic donor compound during heating or after heating, and washing the resulting product with an inert diluent to obtain a magnesium / titanium-containing solid material, wherein the precipitant is a glycol ester compound. The catalyst component has high polymerization activity and stereoselectivity and causes little polymer fine powder when used in the polymerization reaction of olefins.

The invention provides a loaded non-metallocene early transition metal catalytic system, which comprises non-metallocene early transition metal complex represented by structural formula (1) disclosed in the specification, loaded organic aluminoxane and at least a organo-aluminium compound. The catalytic system has good catalytic activity when applied for olefin aggregation or co-polymerization.

The invention relates to a preparation method and applications of an alkoxyl magnesium carrier. The preparation method is used for preparing an olefin polymerization catalyst alkoxyl magnesium carrier. The alkoxyl magnesium carrier comprises the following components: magnesium powder, an initiator, a cross-linking agent, a unitary organic alcohol, a dispersing agent and a dispersing medium according to mole ratio of 1 to (0.00001-0.1) to (0.0001-0.5) to (2-100) to (0.05-50) to (1-100). The involved alkoxyl magnesium carrier is good in particle morphology, high in bulk density, and high in mechanical strength. A catalyst prepared by the carrier is used for preparing an olefin polymerization catalyst, the catalyst is high in activity, good in hydrogen regulation performance and good in copolymerization performance, and the polymer is low in the powder content, low in wax content, and good in particle morphology; the involved catalyst is used for ethylene homopolymerization, copolymerization of ethylene and alpha-olefin, or ethylene and polar alkene monomer, propylene homopolymerization, propylene and alpha-olefin copolymerization or propylene and polar alkene monomer copolymerization.

The invention relates to a method for preparing high-quality energetic crystal material fine particles. Various high-quality energetic crystal material fine particle products, such as pentaerythritol tetranitrate (PETN), cyclotrimethylene trinitramine (RDX), cyclotetramethylenetetranitramine (HMX), hexanitrohexaazaisowurtzitane (CL-20), DADNE (FOX-7), ammonium perchlorate (AP), and the like can be prepared by adopting an ultrasound solvating-out crystallization method in the traditional solvating-out crystallization process. The high-quality energetic crystal material fine particle product prepared by the preparation method disclosed by the invention has subglobular particle form, narrow granularity distribution, average particle diameter of 5-50 microns or so, transparent crystals, high particle density, crystal theoretical density of more than 99.9 percent and obviously reduced shock wave sensitivity and is used for pouring or pressing PBX (Plastic-bonded explosives). The method for preparing the high-quality energetic crystal material fine particles has the advantages of simple process flow and mild reaction conditions and is suitable for mass industrialized production.

The invention provides a spherical magnesium halide adduct and a preparation method thereof, and application of the spherical magnesium halide adduct to preparation of an olefin polymerization catalyst. The spherical magnesium halide adduct is shown as MgXY-mR(OH)r-nE and has a good particle shape, special-shaped materials do not exist, and particles are not adhered. The olefin polymerization catalyst prepared by taking the spherical magnesium halide adduct as a carrier has high hydrogen regulation sensitivity and stereospecificity when used for olefin (particularly propylene) polymerization.

The invention relates to a catalyst component for ethylene polymerization. The catalyst component is characterized in that the preparation method of the catalyst component comprises the following steps: reacting an alcohol compound with metallic magnesium powder to generate a magnesium compound, washing by an inert solvent, drying to obtain white powder, dissolving the white solid powder in an organic epoxy compound and an organophosphorus compound to form a uniform solution, and reacting the uniform solution with a titanium compound in the presence of a precipitation aid which is an organosilicon compound containing no reactive hydrogen to obtain the catalyst component. A catalyst prepared through using the catalyst component has the advantages of high polymerization activity, high hydrogen response and high bulk density because of the selection of the alkyloxy magnesium compound as a carrier when the catalyst is used for the ethylene polymerization. Polymers synthesized through the catalyst especially have the advantages of concentrated particle size distribution and good degree of sphericity.