123results about How to "Less fine powder" patented technology

A catalyst for the polymerization or copdymerization of olefin is composed of Ti-contained solid component A, organoaluminium compound B and organosilicon compound C. Said A is prepared through dissolving magnesium halide in the mixture of organic epoxy compound, organophosphorus compound and inertial diluent, adding educing agent and magnesium halide or its derivatives to educe out Mg/Ti contained deposit, and carrying a surface modifier, a titanium halide or derivative and an electronic doner. It can be used for the polymerization of propene or copolymerization of propene-ethene.

The invention relates to an olefin polymerization catalyst as well as a preparation method and application of the olefin polymerization catalyst. The olefin polymerization catalyst comprises a primary catalyst and a promoter catalyst, wherein the primary catalyst comprises magnesium halide, transition metal halide, organic alcoholate, phosphate ester compound, epoxy haloalkane compound, organo-siloxane compound and organic alcohol ether compound; and the promoter catalyst comprises one or several kinds of the combination of organoaluminum compound. The preparation method of the olefin polymerization catalyst comprises the steps as follows: dispersing the magnesium halide into an organic solvent; sequentially adding the organic alcoholate, the phosphate ester compound and the epoxy haloalkane compound; heating and agitating to dissolve; then sequentially adding the organo-siloxane compound and the organic alcohol ether compound; and dropping the transition metal halide to obtain the primary catalyst, wherein the primary catalyst and the promoter catalyst are individually stored, and combined when in use. According to the olefin polymerization catalyst provided by the invention, the primary spherical catalyst and the promoter spherical catalyst are combined when in use, thus, high catalytic activity is achieved.

A catalyst for polymerization or copolymerization of ethylene is prepared through dissolving magnesium halide in organic epoxy compound, organic phosphorus compound or inertial diluent, adding alkane educing aid, porous inertial carrier and halide of Ti, and educing. It is possible to add alcohol compound and/or electron donor. Its advantages are high activity and copolymerizing performance, and high sensitivity to hydrogen regulation.

This invention provides a catalyst for ethylene polymerization or copolymerization and its synthesis. The catalyst comprises magnesium halide/inorganic matter composite carrier prepared by spray drying. This invention also provides the method for preparing the magnesium halide/inorganic matter composite carrier and the method for synthesizing the catalyst by using the composite carrier. The obtained catalyst has such advantages as high catalytic activity, no breakage of catalyst particles, and narrow particle size distribution. The polymer has such advantages as good particle morphology, little fine powder and high packing density.

The invention is applicable to the field of food processing, and provides an oatmeal cooking method; the method comprises the following steps: baking oat raw grains to perform first cooking; steaming oat by steam to perform second cooking; braising the steamed oat; rolling complete oat grains into oatmeal without grain cutting. According to the invention, while the oat grains is cooked, various enzymes in oat are passivated at high temperatures for several times in procedures such as oat baking, oat steaming, and oat braising; the product is guaranteed not to generate spoilage phenomenon under normal environment; the oatmeal is subject to third cooking during brewing; the oatmeal processed by the 'three cooking' processes has dense and lasting flavor, milk white soup, gloss, and high viscosity; and the oatmeal is chewy, is not sticky to teeth, and has smooth mouthfeel; the invention simultaneously adopts big-sheet rolling technology without grain cutting, and thus the prepared oatmeal has a complete shape, less fragments or fine powder, and good sensory quality.

The invention relates to a preparation method for a polypropylene material special for a transparent sheet. The preparation method comprises the following steps: (1) adding a propylene monomer, a Ziegler-Natta catalyst, an organic aluminum compound and an organic silicone compound to a first liquid-phase reactor for reacting; (2) charging products obtained at the step (1) into a second liquid-phase reactor for reacting; (3) charging products obtained at the step (2) into a first gas-phase fluidized bed reactor for reacting; (4) charging products obtained at the step (3) into a second gas-phase fluidized bed reactor for reacting to obtain polypropylene; (5) pelleting obtained polypropylene at the step (4), adding a compound adjuvant system at the same time, and then discharging to obtain the polypropylene material special for the transparent sheet. The prepared polypropylene resin special for the high-transparency sheet has high rigidity (the flexural modulus is no less than 1400 MPa) and high heat resistance on the premise of keeping the certain toughness.

The invention provides a carrier for an ethylene polymerization catalyst and a catalyst of the carrier. The carrier comprises reactants of the following components: magnesium chloride/gallic acid derivatives/epoxy compounds with carbon-carbon double bonds/alcohol compounds/radical initiators. A mixed solution of the components is initiated by the radical initiators in the process of warming, and the carbon-carbon double bonds in a system can generate a polyreaction, so that the carrier with narrow particle size distribution and doped with polymers can be separated out. The polyethylene catalyst prepared through the carrier not only has the characteristic of narrow particle size distribution but also is high in hydrogen adjustment sensibility; the particle size distribution of obtained polymeric powder materials is particularly intensive, and less fine powder is generated.

The invention relates to a preparation method for anti-impact polypropylene. The anti-impact polypropylene is prepared from propylene and ethylene through polymerization in the presence of a Ziegler-Natta catalyst, and the preparation method comprises the following concrete steps: carrying out propylene homopolymerization in the presence of a solid catalyst component containing titanium, an aluminum alkyl compound and a first external electron donor; then adding a second external electron donor; and carrying out copolymerization of propylene and ethylene. The first external electron donor and the second external electron donor are selected from organosilicon compounds as shown in a general formula R'

R''<q>Si(OR'' ')<4-p-q>, p+q of the first external electron donor is an integer in a range of 2 to 3, and p+q of the second external electron donor is an integer in a range of 0 to 1. The method provided by the invention can improve the reactivity ratio of ethylene; and in particular, through arrangement of a high temperature polymerization area during ethylene-propylene copolymerization, heat removing capability of a circulation gas heat exchanger can be improved, and running load of a condensation/cooling device can be reduced.

The invention relates to a preparation method and application of a superhigh-molecular weight polyolefin catalyst, belonging to the field of olefin polymerization catalysts and olefin polymerization. The preparation method of the catalyst comprises the following steps of: dispersing a carrier in an organic solvent; adding organic lithium or a Grignard reagent and the like in the obtained dispersed solution at -40 DEG C to 30 DEG C, reacting for 0.5-3 hours at -20 DEG C to 30 DEG C after addition, and then raising the temperature to 30-100 DEG C for reacting for 0.5-5 hours to obtain a mixture; filtering and washing the mixture to remove the redundant organic lithium or Grignard reagent; reacting the mixture with a titanium-halogen compound in the organic solvent for 0.5-3 hours at -30 DEG C to 30 DEG C, and then raising the temperature to 30-100 DEG C for reacting for 1-5 hours; and filtering and washing the mixture to remove the redundant titanium-halogen compound and then drying to obtain a main catalyst. The main catalyst prepared in the method has the advantages of favorable particle form, high load capacity, high activity and no drop from the carrier and is suitable for a slurry polymerization process, a gas-phase polymerization process or a combined polymerization process; and the viscosity-average molecular weight of a polymer can be regulated within 800-10000 thousands.

The invention relates to an olefin polymerization catalyst. The olefin polymerization catalyst is prepared from A, a magnesium compound, B, a titanium compound, C, an organophosphorus compound, D, an organic epoxy compound, E, an organosilicon compound and F, an organic alcohol ether compound. At least one of the magnesium compound and the titanium compound is a halogen-containing compound. The olefin polymerization catalyst does not contain a phthalic acid ester compound. The invention also provides a preparation method of the olefin polymerization catalyst and an olefin polymerization method using the olefin polymerization catalyst. The olefin polymerization catalyst is used for olefin polymerization and has good hydrogen regulation sensibility. A polymer prepared through the olefin polymerization catalyst contains less fine powder and has high bulk density.

The invention relates to square particle benzoxazine molding plastic. The square particle benzoxazine molding plastic is prepared from the following components by weight percent: 20 to 40 percent of benxoxazine resin, 30 to 60 percent of chopped fibers, 1 to 5 percent of titanium dioxide, 1 to 3 percent of curing accelerant, 1 to 5 percent of thermoplastic polyurethane elastomer rubber, 1 to 3 percent of stearic acid, 0.5 to 2 percent of wax and the balance of wollastonite; and the components are prepared, mixed, extruded, diced, cooled, screened and magnetically selected so as to remove iron,thus obtaining a square finished product. By adopting the formula, the curing shrinkage is small, the mechanical properties are excellent, the flame retardant performance is high, the heat stabilityis high, less fine powder exists, the rate of finished products is increased, and the environment of a molding workshop is protected.

The invention provides a prepolymerization catalyst for olefin polymerization and a preparation method thereof. The prepolymerization catalyst is highly active during the polymerization. At the prepolymerization stage, beside the pressure and the hydrogen additional proportion, the prepolymerization temperature, varieties of alkylaluminium, the additional proportion of the alkylaluminium and the additional speed of a monomer are also controlled, thus the prepolymerization seriflux concentration of the catalyst can reach 10g/100ml, the particles of the prepolymerization catalyst do not agglomerate and adhere to walls. The finally generated polymerization powders do not agglomerate, the content of the fine powders is reduced obviously, the bulk density is high, and the liquidity is good.

The invention provides a solid catalyst component and a catalyst for olefin polymerization. The solid catalyst component contains Mg, Ti, halogen, and optionally electron donor; and the C value of particles of the solid catalyst component is more than or equal to 0.7, and is an average degree of sphericity. The solid catalyst component and the catalyst have optimized particle forms; and the polymer product has good mobility, high bulk density, sticky prevention and few fine powder and bulks, and has the characteristics of good stability of polymerization production and high unit volume capacity of a reaction kettle.

The invention relates to Ziegler-Natta catalyst electron donor, comprising a catalyst component of the electron donor and a catalyst of the electron donor. The electron donor is acetoxylsilane compound, the catalyst prepared with the acetoxylsilane compound as an electron donor shows high catalytic activity, good hydrogen modulation sensitivity and good copolymerizing performance when used in ethylene polymerization and copolymerization and can be used in homopolymerization of catalytic ethylene or copolymerization of ethylene with other Alpha-olefins to produce high-performance polyolefin material with high bulk density, narrow particle size distribution and low fine particle content.