417 results about "Metallocene" patented technology

The invention provides a polyethylene composite film. The polyethylene composite film comprises a surface layer, a middle layer and a heat sealing layer which are sequentially stacked, wherein the surface layer is composed of 58%-76% of hexene copolymerized metallocene linear low density polyethylene, 18%-37% of low density polyethylene and a small amount of slipping agent and anti-blocking agent; the middle layer is composed of 79%-88% of octene copolymerized metallocene medium density polyethylene, 5%-21% of hexene copolymerized metallocene linear low density polyethylene and 6%-15% of high density polyethylene; and the heat sealing layer is composed of 47%-65% of hexene copolymerized metallocene linear low density polyethylene, 33%-45% of low density polyethylene and 2%-5% of a tackifier. According to the composite film disclosed by the invention, through gradient design of each layer of material, the whole composite film has rigidity and toughness, and the composite film is particularly suitable for manufacturing stand-up bag packages which stand stably and are compression-resistant and impact-resistant.

The present disclosure relates to a metallocene-catalysed multimodal polyethylene polymer (P), and to methods and uses of the multimodal polymer (P) of ethylene in film applications, and to a film including the disclosed polymer (P).

The invention discloses a metallocene polypropylene synthesis catalytic performance prediction method, which comprises the following steps: data collection: collecting experimental data of metallocene catalyst synthesis polypropylene, and establishing a data set containing input variables and output variables; data preprocessing: cleaning, standardizing and coding experimental data; feature engineering: carrying out feature correlation analysis on the preprocessed data; model construction: constructing independent prediction models for predicting catalyst activity, number-average molecular weight and molecular weight distribution by using a plurality of machine learning algorithms respectively; performing hyper-parameter optimization: performing hyper-parameter optimization on the prediction model by adopting a Bayesian optimization algorithm to obtain an optimal model parameter; model evaluation: evaluating the performance of the prediction model by adopting a cross validation method; and predicting: inputting process parameters and catalyst ligand parameters input by a user into the optimized and evaluated optimal prediction model, and outputting predicted values of catalyst activity, number-average molecular weight and molecular weight distribution.

The invention provides a high-toughness bundling grating and a production process of the high-toughness bundling grating. The composite material is prepared from the following raw materials in parts by weight: 32 to 42 parts of epoxy modified unsaturated polyester resin, 26 to 36 parts of alkali-free glass fiber, 7 to 11 parts of metallocene polyolefin, 5 to 9 parts of high-branching-degree polyolefin, 4 to 8 parts of ethylene propylene diene monomer, 2.5 to 5.5 parts of core-shell structure elastomer toughening agent, 1.5 to 4.5 parts of modified nano aluminum nitride-graphene composite filler, 0.7 to 1.1 parts of silane coupling agent and 0.5 to 0.9 part of antioxidant. 0.4 to 0.7 part of ultraviolet stabilizer, 0.4 to 0.8 part of calcium stearate and 0.1 to 0.3 part of conductive additive. According to the invention, the core-shell structure elastomer toughening agent realizes toughening without damaging strength through core-shell synergy, and the impact strength is improved by 40% or above; the modified nano aluminum nitride-graphene composite filler constructs a heat conduction-antistatic network, and the modified nano aluminum nitride-graphene composite filler and the metallocene polyolefin are matched with the high-branching-degree polyolefin and the ethylene propylene diene monomer to enhance low-temperature toughness and creep resistance.

The invention provides a phosphorus-nitrogen coordinated metallocene compound and a preparation method and application thereof, the compound has a structure as shown in a formula I: in the formula I, M is selected from IVB group metals in the periodic table of elements; r1 is selected from hydrogen, halogen, C1-C10 direct or branched alkyl, and C1-C3 alkoxy; r2 is selected from hydrogen and C1-C6 straight chain or branched chain alkyl; y is selected from chlorine, C1-C3 alkyl substituted or unsubstituted by trimethylsilyl, and amino substituted by trimethylsilyl. The phosphorus-nitrogen coordinated metallocene compound provided by the invention has relatively high thermal stability, catalytic activity and comonomer insertion rate, and can realize high-temperature solution polymerization of ethylene and norbornene.

The invention provides a catalyst composition containing an organic boron compound. The catalyst composition comprises a non-metallocene catalyst and the organic boron compound. Compared with an existing organic boron catalyst, the organic boron compound in the catalyst composition has the advantage that the solubility of the organic boron compound in alkane is remarkably improved, so that the catalytic activity of the non-metallocene catalyst in the composition can be remarkably improved. And the polymer obtained by catalysis has high molecular weight. In addition, the obtained polymer has proper molecular weight distribution and melting temperature, and has certain commercial application.

This invention provides a crack-resistant, high-toughness composite packaging bag and its preparation method, relating to the field of composite packaging bag technology. The bag includes a bag body comprising an inner cold-resistant toughening layer, a middle elastic buffer layer, and an outer tough protective layer. The inner wall of the bag body has a material guide strip, and the bottom of the inner wall has longitudinal reinforcing ribs. The material guide strip has exhaust micropores. A flexible buffer pad is installed at the bottom of the bag body. Elastic buffer strips are provided on both sides of the bag body. Rounded transition corners are provided on both outer sides of the bottom of the bag body. In this invention, by using an inner cold-resistant toughening layer made of modified metallocene PE and POE toughening agents combined with a TPE material middle elastic buffer layer, the toughness of the bag body in low-temperature environments of -18℃ to -5℃ is significantly improved, preventing low-temperature embrittlement of the substrate. It can effectively withstand the instantaneous impact of high-speed filling of viscous materials, completely solving the problem of low-temperature embrittlement and cracking.

This invention relates to the field of packaging film technology and provides a low-temperature polyolefin packaging film and its preparation method. The packaging film comprises a three-layer co-extruded structure consisting of an outer layer, a middle layer, and an inner layer. The components of each layer are as follows: Inner layer: metallocene polyolefin, high-performance polypropylene, modified lignin nanofibers, and erucamide / silica composite microspheres; Middle layer: PCR, modified nano-kaolinite, and trimethylolpropane triacrylate; Outer layer: PCR, modified tourmaline nanotubes, benzoyl peroxide microcapsules, and polydopamine-coated chitosan. This invention uses PCR, which is more energy-efficient and environmentally friendly. The addition of modified lignin nanofibers to the inner layer improves tensile strength; the addition of modified nano-kaolinite to the middle layer improves thermal shrinkage; the addition of modified tourmaline nanotubes to the outer layer lowers the crosslinking reaction initiation temperature and improves shrinkage; and the addition of polydopamine-coated chitosan allows for reversible recombination upon damage, improving puncture strength.

The invention relates to the technical field of metallocene polyolefin materials, and particularly discloses a modified polyolefin film material as well as a preparation method and application thereof. The film material is prepared from the following components in parts by weight: 50 to 70 parts of metallocene linear low-density polyethylene, 20 to 35 parts of ethylene-butyl acrylate copolymer, 15 to 25 parts of polyolefin elastomer, 5 to 15 parts of bio-based degradable polyester elastomer, 3 to 8 parts of reactive compatilizer, 5 to 15 parts of organic modified layered double hydroxide, 8 to 20 parts of composite flame retardant, 0.3 to 1.5 parts of antioxidant and 0.5 to 1.5 parts of lubricant. The preparation method comprises the steps of melt blending, casting extrusion, two-way stretching and the like. The thin film has low hardness, high elongation, low melting point and moderate mechanical strength, the performance of the thin film can accurately meet specific application requirements, and the thin film is particularly suitable for the field of composite fabric of clothes, bags, shoes, hats and the like with high requirements for touch feeling and elasticity.

The application relates to the technical field of packaging materials, and discloses a high-impact multilayer heavy packaging film composition and a multilayer heavy packaging film and application thereof. The composition comprises an outer layer material, a core layer material and an inner layer material, wherein the core layer material contains linear low-density polyethylene, polypropylene and optional metallocene polyethylene; the components of the outer layer material and the components of the inner layer material are the same or different, and each contains linear low-density polyethylene, metallocene polyethylene, high-density polyethylene and ethylene-vinyl acetate copolymer or polyolefin elastomer. The multilayer heavy packaging film can improve the dart impact performance of the multilayer heavy packaging film.

The invention provides a low-smoke halogen-free high-flame-retardant power cable and a preparation method thereof, and the low-smoke halogen-free high-flame-retardant power cable comprises a conductor, an insulating layer and a sheath layer. The sheath layer is prepared from the following raw materials: 25 to 40 parts of ethylene-vinyl acetate copolymer, 15 to 25 parts of linear low-density polyethylene, 5 to 15 parts of metallocene polyethylene, 8 to 15 parts of reactive phosphorus-nitrogen-silicon hybrid compatibilizer, 12 to 22 parts of low-temperature sintered ceramic composite powder, 30 to 45 parts of surface-treated magnesium hydroxide, 15 to 25 parts of surface-treated aluminum hydroxide, 3 to 6 parts of organic modified montmorillonite and 1.5 to 2.5 parts of triallyl isocyanurate. 1.0 to 2.0 parts of a composite antioxidant, 1.0 to 2.5 parts of a calcium-zinc stabilizer and 0.5 to 1.5 parts of silicone master batch. The prepared low-smoke halogen-free high-flame-retardant power cable has excellent flexibility, mechanical property, heat resistance and processability, is stable in flame retardant property and stable in size, and is suitable for safety protection of power cables.

The invention discloses a metallocene polypropylene composite material as well as a preparation method and application thereof. The metallocene polypropylene composite material is prepared from the following components in parts by mass: 84.63 to 96.50 parts of metallocene isotactic polypropylene, 0 to 6 parts of polypropylene random copolymer, 3 to 9 parts of allyl elastomer, 0 to 3 parts of polypropylene wax, 0.10 to 0.55 part of organic peroxide degradation agent, 0 to 1.8 parts of hindered hydroxylamine ester degradation agent and 0 to 0.15 part of phosphate ester antioxidant. The metallocene polypropylene composite material is suitable for a melt-blowing processing technology, and the melt-blowing non-woven fabric of the metallocene polypropylene composite material has lasting filtering performance.

There is provided an alkali dispersible-type hot melt pressure-sensitive adhesive, comprising:(A) a thermoplastic block copolymer that is a copolymer of vinyl aromatic hydrocarbons and conjugated diene compounds,(B) a metallocene olefin polymer,(C) a tackifying resin, and(D) at least one selected from the group consisting of fatty acids and derivatives thereof.

The invention provides a high-density polyethylene composite geomembrane and a production process thereof, and the high-density polyethylene composite geomembrane comprises a cast film and geotechnical cloth. The cast film is prepared from the following raw materials: 52 to 68 parts of high-density polyethylene, 6 to 12 parts of modified metallocene polyolefin-graphene compound, 4 to 9 parts of modified polyolefin-ethylene-vinyl alcohol master batch, 5 to 10 parts of alpha-olefin ethylene copolymer, 3 to 7 parts of vinyl elastomer, 1 to 3 parts of polytetrafluoroethylene micro powder, 0.1 to 0.3 part of antioxidant, 0.2 to 0.5 part of ultraviolet stabilizer and 0.1 to 0.3 part of lubricant. And 1.5-3 parts of an ultraviolet screening agent. The composite geomembrane obtained by the invention has the advantages of high strength, high toughness, high impermeability, excellent pollution resistance, excellent weather resistance, high puncture resistance, firm membrane-cloth combination, good thickness uniformity and the like.

The application relates to the chemical technology field and discloses a metallocene compound, a preparation method and a metallocene catalyst and application thereof. The metallocene compound provided by the application comprises a fluorenyl ligand, a metallocene ligand, a bridging structure and a metal part in a chemical structure. By introducing an adsorption group with a micropore effect into the fluorenyl ligand, the metallocene compound can exhibit strong saturated adsorption capacity when interacting with cocatalysts such as organic boron and organic aluminum, the cocatalyst concentration around the metal center can be improved, the activity and thermal stability of the catalyst can be significantly enhanced, the metallocene compound can catalyze alpha-olefin polymerization with high activity, the amount of the cocatalyst is reduced, and the production cost of polyolefin is reduced.

According to the present disclosure, a catalyst composition that can not only exhibit high activity in an olefin polymerization reaction and thus contribute to reducing catalyst costs, but also exhibit high copolymerizability which can secure excellent processability and long-term physical properties, and thus, is suitable for providing polymers for pipes, and a method for preparing an olefin polymer using the catalyst composition is provided.

The invention provides a boiling-resistant traceless sealing film for an aluminum foil box and a preparation method of the boiling-resistant traceless sealing film, and relates to the field of packaging. Comprising a PET layer, an aluminum foil layer, a BOPA enhancement layer and a heat sealing layer, wherein the BOPA enhancement layer comprises BOPA resin, organic modified montmorillonite, quaternary ammonium salt nano cellulose, a composite antioxidant, a lubricant and a compatilizer; the heat sealing layer comprises metallocene polyethylene, ethylene-vinyl acetate, maleic anhydride grafted polyethylene, a lubricant, thiolated nano zinc oxide, chitosan, organic modified montmorillonite and antibacterial modified silicon dioxide; the aluminum foil layer is made of chitosan-cellulose modified aluminum foil. The sealing film has the advantages of being high in strength, easy to tear off and good in antibacterial property.

The utility model discloses a metallocene catalyst washing device, relates to the field of catalyst production, and aims to solve the problem that in the prior art, a catalyst is accumulated in a washing device body and cannot be completely washed only through a water flow washing mode, so that the catalyst is not fully washed. An annular limiting plate is fixedly arranged on the lower end face in the cleaning barrel, a washing barrel is arranged at the upper end in the annular limiting plate, a water permeable plate is arranged on the lower end face of the washing barrel, a fixing pipe is fixedly connected to the middle of the lower end face of the cleaning barrel, and a booster pump is fixedly connected to the lower end of the fixing pipe. A rotating pipe is arranged on the inner side of the annular limiting plate and located at the lower end of the washing barrel, a plurality of water spraying pipes are arranged at the upper end of the rotating pipe, surging type washing of the metallocene catalyst is achieved through the rotating pipe and the water spraying pipes in cooperation with high-pressure water flow provided by a booster pump, accumulated catalyst particles are effectively scattered, and the washing quality is improved.

The invention discloses a high-temperature-resistant high-activity metallocene catalyst and application thereof, and belongs to the technical field of olefin polymerization catalysts. The catalyst provided by the invention is formed by taking a fused ring structure with a rigid framework as a ligand framework and coordinating with transition metal titanium, zirconium or hafnium, so that the catalyst has excellent thermal stability and high catalytic activity, and is suitable for copolymerization reaction of ethylene and alpha-olefin. In the high-temperature polymerization reaction, the catalyst provided by the invention realizes efficient copolymerization of ethylene and alpha-olefin, and the obtained copolymer not only has higher molecular weight, but also has higher comonomer insertion amount, so that the structure and performance of the product are effectively regulated and controlled.

The present invention relates to a metallocene catalysed multimodal polyethylene copolymer (P), the use of the multimodal copolymer of ethylene (P) in film applications and a film comprising the polymer composition of the invention.

This invention proposes a poly(4-methyl-1-pentene) resin based on a supported metallocene catalyst and its preparation method. Based on a stepwise loading process using a silanized porous support, by optimizing the type of support (such as SiO2, Al2O3, MCM-41), the amount of support added (3 to 15 times), and the stepwise loading sequence (co-catalyst first, then main catalyst), the catalyst activity, stability, and product performance are synergistically improved, providing an innovative solution for the conversion of supported catalysts into industrial-scale high-efficiency systems.

The invention provides a mono-titanocene metal complex, a catalyst composition, a propylene and 5-vinyl-2-norbornene copolymer and a preparation method, and the mono-titanocene metal complex has a structure as shown in a formula (I). The mono-titanocene metal catalytic system provided by the invention has the characteristic of high catalytic activity; and the propylene and 5-vinyl-2-norbornene copolymer with high molecular weight, narrow molecular weight distribution and high glass transition temperature can be prepared.

The invention provides a preparation method of a bridged metallocene compound capable of improving the utilization rate of a ligand. According to the method, the utilization rate of the bridged double-metallocene ligand is increased through the ether complex, so that the total yield of the bridged metallocene catalyst with two configurations of rac and meso is high.

The invention provides a metallocene catalyst and a preparation method and application thereof. The method comprises the following steps: providing a first silicate aqueous solution with the pH value of 9-10 as a base solution; mixing the second silicate aqueous solution, inorganic acid and the base solution, and aging at 70-80 DEG C to obtain a first mixed solution; mixing and reacting the first mixed solution, an alkaline substance and organic alcohol to obtain a second mixed solution; mixing and reacting the second mixed solution, an alkaline substance and organic alcohol to obtain a hydrogel system; mixing the hydrogel system with inorganic acid to obtain acidified gel; performing first post-treatment to obtain a silica gel carrier; carrying out thermal activation on the silica gel carrier, and mixing and reacting with an aluminum alkyl solution to obtain MAO modified silica gel; and mixing the MAO modified silica gel with a metallocene compound, reacting, and carrying out second post-treatment to obtain the metallocene catalyst, wherein the alkaline substance comprises one or a combination of more than two of ammonia water, ammonium carbonate and ammonium bicarbonate. The metallocene catalyst has good catalytic activity.

The invention relates to a process for preparing a star copolymer of 1,3-diene and ethylene, the copolymer containing more than 50 mole percent ethylene units. The process comprises the polymerization of a monomeric mixture of 1,3-diene and ethylene in the presence of a catalytic system based on at least one neodymocene borohydride metallocene and an organomagnesium cocatalyst, followed by the reaction of tin tetrachloride with the polymerization reaction product, and then a chain-terminating reaction. The invention also relates to a star copolymer obtainable by the process according to the invention.

The invention relates to the field of high polymer materials, and discloses a high-temperature-steaming-resistant PE (polyethylene) film and a preparation method of the high-temperature-steaming-resistant PE film. Comprising the following raw materials in parts by weight: 50-60 parts of metallocene polyethylene, 15-20 parts of bio-based polyethylene, 0.8-1.2 parts of dicumyl peroxide, 0.3-0.5 part of a cross-linking agent, 3-4 parts of nano silicon dioxide, 2-3 parts of layered double hydroxides, 0.5-1 part of graphene nanosheets, 8-12 parts of fluorine-containing polymer modified PE resin and 0.8-1 part of an organic tin-rare earth composite heat stabilizer. The shape and strength at high temperature are guaranteed through metallocene polyethylene and bio-based polyethylene, dicumyl peroxide is combined with a cross-linking agent to reinforce heat resistance and size stability, fluorine-containing polymer modified PE resin forms a fluorine-containing protective layer, an organic tin-rare earth composite heat stabilizer inhibits thermal degradation, a composite antioxidant captures free radicals, and the film is prevented from yellowing and embrittling.

The present invention provides a metallocene complex and a method for producing the same, a catalyst composition, an olefin polymerization method, and an olefin polymer. The metallocene complex has a structure represented by formula I. The catalyst composition containing the metallocene complex of the present invention exhibits improved catalytic activity, has a high ability to control the structural regularity of the conjugated diolefin structural unit, and has a high ability to copolymerize ethylene with a conjugated diolefin. In addition, the metallocene complex of the present invention has a simple production process and low cost. [Formula 1] JPEG2025515221000023.jpg86169

A solution-phase polymerization process using a metallocene catalyst in the first reactor and a Ziegler-Natta catalyst in the second reactor yielded 0.942 g / cm³. 3 A high-density polyethylene composition is obtained having a density and a melt index I2 exceeding 5.0 g / 10 min. When prepared into plaque, the high-density polyethylene resin has an environmental stress crack resistance (ESCR) exceeding 1000 hours (determined by ASTM D1693 in 100% IGEPAL CO-630 under condition B) and an IZOD impact strength of 10 feed-pounds / inch or more. The polyethylene composition containing the first and second ethylene copolymers is relatively easy to process and can be used in the manufacture of molded articles.

The application discloses a method for preparing polyethylene wax by using a carborane bridged rare earth metallocene catalyst, and simultaneously preparing a carborane bridged indenyl rare earth metallocene compound as a main catalyst, loading the prepared main catalyst and a cocatalyst on a magnetic mesoporous Fe3O4@Al2O3 core-shell nanoparticle carrier to obtain a supported rare earth metallocene catalyst; the main catalyst of the application is a carborane bridged indenyl rare earth metallocene compound with a structure shown in formula (I), wherein a bridging group adopts a closed carborane (closed-1,2-dicarbadodecaborane), and the cage-like three-dimensional structure has super-high thermal stability and chemical inertness and does not degrade or rearrange in a high-temperature molten state of 130-200 DEG C. Large-volume substituents such as methyl, tert-butyl, phenyl or 4-tert-butylphenyl are introduced on the indene ring to provide sufficient steric protection and further inhibit chain transfer and side reactions at high temperatures.