39results about How to "Moderate molecular weight distribution" patented technology

A solid catalyst component for olefin polymerization includes titanium, magnesium, a halogen, and a compound represented by the following formula (1): R1O—C(═O)—O—Z—OR2, and an olefin polymerization catalyst includes the solid catalyst component, an organoaluminum compound, and an optional external electron donor compound. An olefin polymer that has a moderate molecular weight distribution while maintaining high stereoregularity can be produced by utilizing the solid catalyst component and the olefin polymerization catalyst.

The invention discloses a production method and production equipment for special materials for high-grade polypropylene melt-blown non-woven fabrics. For every 100 kilograms of polypropylene, 50-200 grams of long-acting stabilizers and 25-200 grams of short-acting stabilizers are added to achieve high temperature resistance and stability. 25-160 grams of lubricant, 20-100 grams of lubricant; the mixer stirs, feeds to the extruder, and reacts in the screw reaction section of the twin-screw extruder; the production equipment, including the mixer, mixes uniform raw materials from mixing The material outlet goes down to the middle silo, and the bottom outlet of the middle silo is connected to the inlet of the extruder. The extruder has a twin-screw structure. The extruder sends the processed material to the cooling water tank through the inclined water tank for cooling, and then in the air dryer Air-dried, granulated in a granulator, screened by a vibrating sieve, and sent to a homogenizing blending tank through a rotary feeder. The invention has the beneficial effects of mixing evenly, solving the molding problem of high-fluidity melt index polypropylene, and being suitable for conventional production.

The invention discloses a high slump retarding polycarboxylate water reducer and its preparation method and application. The water reducer is prepared from the following raw materials in molar parts: 10-30 parts of small molecule unsaturated carboxylic acid, 3‑8 parts of esters of small molecular unsaturated carboxylic acids, 1‑5 parts of salts of small molecular unsaturated carboxylic acids, 2‑6 parts of polyethylene glycol diacrylate, 1‑5 parts of unsaturated polyether macromonomers , 8-20 parts of acrylamide monomer, initiator and chain transfer agent; wherein said acrylamide monomer is acrylamide (AM), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), 2 ‑acrylamido‑2‑phenylethanesulfonic acid (AMSS) is a group of three monomers. The molecular structure of the superplasticizer is designed according to the ease and slump retention of the construction requirements, and finally a high-slump retention and retardation polycarboxylate superplasticizer with excellent comprehensive performance is obtained. In construction, a low dosage can achieve a higher water reducer The water rate can ensure the construction, and the slump retention is excellent, and the slump is basically not lost within 3 hours, and it has wide applicability in concrete construction.

The invention relates to a non-bridge mono / bi-nuclear metallocene compound and a relative application olefin polymerization catalyst technical field. The compound contains 1-(4-methyl)-phenyl-2, 3, 4, 5-tetramethyl cyclopentadienyl-(2, 4, 6-tertiary butyl phenoxy)-titanium chloride, and (3, 3', 5, 5'-quattuor isopropyl-4, 4'-biphenyl oxygen)-bi-[1-(4-methyl)-phenyl-2, 3, 4, 5-tetramethyl cyclopentadienyl-titanium dichloride] or the like. The metallocene compound can be used as main catalyst, while alkyl aluminum is used as promoter, or organic boron compound and alkyl aluminum are assembled into a promoter system, to catalyze and synthesize high-molecular-weight atactic polypropylene with improved catalysis activity and polymer molecular weight, which can catalyze the polymerization of vinyl and alpha-olefin, to obtain the polymer with suitable molecular weight in narrow distribution and high co-monomer content.

The invention discloses a double-screw extruder suitable for melt-blown nonwoven cloth special material production. The double-screw extruder comprises a cylinder, wherein the cylinder is arranged transversely on a bracket; an exhaust chamber and a degradation agent injection hole are arranged above the cylinder; a heating tile is further packaged on the surface of the cylinder; one end of the cylinder is connected with a blanking barrel; double screws are arranged in the cylinder; the length-diameter ratio of the double screws is 40-58; and screw elements sleeve the double screws. The double-screw extruder has the following beneficial effects: by utilizing the length-diameter ratio of the screws, the screw combination design and the degradation agent feed hole position design, the raw materials and auxiliary materials are mixed completely and uniformly during reaction, the reaction is relatively sufficient, the product melt index is stable, the molecular weight distribution is proper, and the double-screw extruder is suitable for a melt-blown spinning process.

The invention relates to a synthesis method of a bimodal-distribution ethylene-propylene-nonconjugated diene random copolymer, which comprises the following steps: introducing a gas mixture of ethylene, propylene and hydrogen into a reaction kettle, adding a primary catalyst, a cocatalyst and an activating agent, and adding the non-conjugated diene for polymerization at 25-45 DEG C under the pressure of 0.3-0.6 MPa. The propylene / ethylene mol ratio is 1-6; the hydrogen accounts for 0.05-0.5 mol% in the comonomer; the addition amount of the non-conjugated diene in every 1000mL of hexane is 2-10mL; the acidic-phosphate modified vanadium compound is used as the primary catalyst, the halogenated alkyl aluminum is used as the cocatalyst, and the mol ratio of Al in the cocatalyst to V in the primary catalyst is (1-100) / 1; the activating agent is ethyl trichloroacetate, and the mol ratio of the activating agent and the vanadium compound is (1-10) / 1; and the copolymer has high Mooney viscosity and moderate molecular weight distribution, and is used in processing rubber of automobile seals.

The invention discloses a method based on autocatalysis self-initiation ring opening of a poly(N-heterocylic carbene) structure to synthesize a brush polymer. The method includes: under inert gas shielding, adding annular monomer capable of being in ring opening polymerization under catalytic action of N-heterocylic carbene into an organic solution containing poly(N-heterocylic carbene), wherein a molar ratio of poly(N-heterocylic carbene) repetitive unit to at least one annular monomer is 1:1-1000, reaction temperature is minus 80 DEG C-120 DEG C, and reaction time is 10s-48h. The invention further discloses the brush polymer of a poly(N-heterocylic carbene) carbon dioxide adduct structure obtained by adding carbon dioxide to terminate reaction in the method. More brush polymers various in structure can be obtained by repeating the method. The method is simple in step, an initiator is not needed, a catalyst is metal-free, and the obtained polymer is narrow in molecular weight distribution, controllable in structure, high in grafting density and wide in application range.

The present invention relates to a synthesis method of a bimodal-distribution ethylene-alpha-alkene-non-conjugated dialkene random copolymer. The method comprises the following steps: a high-molecular weight part ethylene-propylene copolymer is synthesized from ethylene, propylene and hydrogen (the mol ratio is 1:1.0-3.0:0.15-0.30) and ethidene norbornylene 2-5 mL / L hexane; a low-molecular weight part ethylene-propylene copolymer is synthesized from the ethylene, the propylene and the hydrogen (the mol ratio is 1:3.0-4.5:0.9-2.0) and ethidene norbornylene 8-12 mL / L hexane; the main catalyst is soluble vanadium complex, and the cocatalyst is ethylaluminium sesquichloride; the mol ratio of Al to V is 1-100; the activating agent for the low-molecular weight part is ethyl trichloroacetate; and the mass ratio of the high-molecular weight part ethylene-propylene copolymer to the low-molecular weight part ethylene-propylene copolymer is 80 / 20-40 / 60. The copolymer has the advantages of high Mooney viscosity and moderate molecular weight distribution, and can be used for processing rubber for automobile gland strips.

The invention discloses an amido-bridged bisaryloxy rare-earth metal guanidyl compound. The amido-bridged bisaryloxy rare-earth metal guanidyl compound is characterized in that the general formula of the compound is [ONNO]Ln[(R1N)2C(NR2)], and the chemical structural formula of the compound is defined in the specification, wherein Ln is one of rare-earth metals ytterbium, yttrium and samarium; [ONNO]=Me2NCH2CH2N[CH2-(2-O-C6H2-R2-3-R3-5)]2, R2 and R3 are selected from one of methyl, tertiary butyl and cumenyl; and [(R1N)2C(NR2)] represents guanidyl, R1 is selected from one of isopropyl and cyclohexyl, and NR2 is selected from one of diphenylamine group, diisopropylamine group, di(trimethylsilyl) amine group, di(dimethylsilyl) amine group and piperidyl group. The compound is simple in synthesis, clear in structure and high in yield. The invention provides a preparation method for the compound aforementioned and an application method for catalyzing the ring opening polymerization of 1,4-dioxane-2-ketone by using the compound as a catalyst simultaneously. The preparation method is moderate in conditions, fast in reaction speed and high in activity; and the obtained polymer is high in molecular weight and proper in molecular weight distribution.

The invention discloses a titanium complex containing a polynitro-substituent phenoxyimine ligand, a preparation method and an application. Its preparation method is obtained by the reaction of phenoxyimine ligand with polynitro-substituent and titanium tetrachloride in dichloromethane solvent through coordination and dehydrochlorination, while ligand L is obtained from 4,6-di Nitro‑2‑aminophenol and 5‑nitrosalicylaldehyde are prepared in high yield through condensation reaction. The invention has the characteristics of cheap and easy-to-obtain raw materials and low preparation cost, and the prepared titanium complex C containing polynitro-substituent phenoxyimine ligands needs less activating dose when catalyzing ethylene polymerization, and can catalyze ethylene polymerization. It has the characteristics of ultra-high activity, high polymerization temperature resistance and long activity time, less cooling water consumption during polymerization reaction, moderate molecular weight distribution of catalytic polymerization products and high molecular weight of polymerization products, and has broad industrial application prospects.

The invention relates to bisphenol Z-bisphenol AF copolymer polycarbonate adhesive resin as well as a preparation method and application thereof. Bisphenol Z and bisphenol AF are copolymerized in a certain proportion to prepare binary copolymer polycarbonate; and according to needs of different solubility, the bisphenol Z, the bisphenol AF and triphosgene in different proportions are copolymerized to prepare the bisphenol Z-bisphenol AF copolymer polycarbonate. According to the bisphenol Z-bisphenol AF copolymer polycarbonate, the binary copolymer polycarbonate prepared by copolymerizing the bisphenol Z, the bisphenol AF and the triphosgene is proper in molecular weight distribution, is relatively good in solubility, and is relatively low in cost; and the binary copolymer polycarbonate is used as adhesive resin of a carrier transmission material for preparing a carrier transmission layer of an organic optical conductor.

The invention discloses an alcohol soluble polyacrylate resin and a preparation method and an application thereof; the preparation method comprises the following steps: taking 260-800 parts of alcohols solvent, adding the solvent in a reaction kettle with a mixer, a reflux condenser, a heating jacket and a nitrogen covering layer, then heating the system to 70-150 DEG C, mixing the mixture for 10-30min; adding acrylic ester used as hard monomers, acrylic ester used as soft monomers, polar functional group monomers, organosilane monomers and initiator to react for 4-7h and obtain alcohol soluble polyacrylate resin. The alcohol soluble polyacrylate resin prepared by the method of the invention has no excitant odour, the number-average molar mass is 10,000-200,000, the molecular weight distribution is 1.1-4 and the Brookfield viscosity of the resin system is 100-5000cp. The coating which is prepared by mixing the resin with other pigments, fillers and assistants can be applied in glass, aluminium coil and polypropylene plastic for surface decoration and protective function.