495 results about "Polymerization catalysts" patented technology

The invention discloses a method for preparing regenerated flame-retardant high-shrinkage polyester by a methanol alcoholysis method, and belongs to the technical field of polyester. The method comprises the following steps: (a) mixing the waste polyester fabric with methanol, and carrying out catalytic depolymerization to obtain a regenerated DMT mixed solution; (b) carrying out impurity separation and methanol recovery treatment on the regenerated DMT mixed solution, and then carrying out cooling crystallization, centrifugal drying and rectification purification treatment to obtain pure DMT; (c) carrying out transesterification on pure DMT, ethylene glycol, a transesterification catalyst and a DEG inhibitor; (d) after the ester exchange reaction, adding CEPPA-EG and IPA-EG for copolymerization; adding a polymerization catalyst, a stabilizer and an antioxidant for polymerization reaction to obtain a modified polyester melt; and (e) granulating and drying to obtain the slices. The regenerated polyester prepared by the method has multiple functions of flame retardance, high boiling water shrinkage, low-temperature dyeing and the like, and is suitable for the fields of high-end clothing, automotive trim, electronic packaging materials and the like.

The invention belongs to the technical field of propylene polymerization, and particularly relates to a catalyst for olefin polymerization, an isotacticity-adjustable propylene polymer containing an ultra-high molecular weight polypropylene component and a production method of the isotacticity-adjustable propylene polymer, and the method comprises the following steps: in the presence of hydrogen and a polymerization catalyst, propylene or propylene reacts with one or more optional comonomers; at least one part of the obtained material flow containing the polypropylene component I is continuously subjected to polymerization reaction for 0.05-3.0 hours in a pipeline positioned outside the reactor or a subsequent reactor connected with the pipeline in series and in the presence of a mixture DH of a hydrogenation catalyst and an external electron donor; a propylene polymer product containing 0.03 wt%-15.0 wt% of an ultra-high molecular weight polypropylene component is obtained; the molar ratio of the hydrogenation catalyst to the total amount of hydrogen is 1 / 10000 to 1 / 100. According to the invention, the polypropylene product containing the ultra-high molecular weight component with lower content is prepared, and the isotacticity of the ultra-high molecular weight polypropylene component can be flexibly adjusted.

The invention discloses a recycling method of polyethylene glycol terephthalate (PET). According to the method, organic acid is used as a catalyst for hydrolysis of PET, the organic acid is selected from one or more of adipic acid, lactic acid and glycollic acid, and then hydrolysis products are directly polymerized with additional monomers and polymerization catalysts to prepare the biodegradable copolyester without any separation treatment step. The prepared copolyester has biodegradability, so that the non-degradable PET is converted into the biodegradable copolyester by the recycling method, and the recycling method has important significance for relieving the problem of environmental pollution.

The present invention discloses a class of nitrogen heterocycle-substituted hexa-dentate aminophenoxy rare earth complexes (I), a preparation method thereof, and an application thereof in the highly active catalytic ring-opening polymerization of lactones. The preparation method comprises the following steps: reacting a neutral ligand with a metal raw material compound in an organic medium, then adding an alcohol for reaction, and obtaining the target compound through filtration, concentration, and recrystallization. The nitrogen heterocycle-substituted hexa-dentate aminophenoxy rare earth complex of the present invention is a highly efficient catalyst for the ring-opening polymerization of lactones, and can be used for catalyzing the polymerization reaction of lactones such as lactide, and catalyzing the one-pot copolymerization of lactide and ε-caprolactone to obtain a multi-block copolymer. The nitrogen heterocycle-substituted hexa-dentate aminophenoxy rare earth complex of the present invention has good tolerance to impurities, has very high catalytic activity, and can obtain high molecular weight polyester materials. A has a structure shown in formula (II), (III), (IV) or (V); B has a structure shown in formula (VI) or (VII).

A method for producing high-purity synthetic graphitized carbonaceous materials with impurity levels below 100 ppm, derived from plant-based biomass extracts. The method involves mixing furan-ring containing precursor compounds with polymerization catalysts and additives, followed by polymerizing the mixture at temperatures between 20°C and 200°C. The solid polymers are carbonized and graphitized using heat treatments up to 1500°C and 3000° C, respectively. Besides disclosing the specifics of the process, typical materials characteristics (X-ray diffraction, Raman spectroscopy, specific surface area, impurity content and electrochemical test data) of the synthesized graphite are also disclosed. Details of the additives used to control the reaction, to add electrochemical performance to the graphite, and to catalyze the graphitization reaction, are presented.

It is intended to provide a method for producing a catalyst for olefin polymerization which exhibits excellent catalytic activity in a polymerization treatment and permits production of a polymer excellent in stereoregularity, melt flowability, etc., even when the polymerization catalyst is prepared in an inert gas atmosphere by using a solid catalytic component comprising an electron-donating compound other than a phthalic acid ester. The method for producing a catalyst for olefin polymerization comprises performing a pre-contact treatment of bringing a solid catalytic component (A) comprising a magnesium atom, a titanium atom, a halogen atom and an electron-donating compound having no phthalic acid ester structure, a specific organoaluminum compound (B) and an external electron-donating compound (C) into contact with each other at a temperature of lower than 15° C. for a time of 30 minutes or shorter in the absence of the olefin.

The invention belongs to the technical field of propylene polymerization, and particularly relates to a propylene polymer containing ultra-high molecular weight components and a preparation method thereof. The method comprises the following steps: (i) in the presence of a polymerization catalyst and hydrogen, propylene or propylene and a comonomer are subjected to a first-stage (co) polymerization reaction for 0.1-10 hours to prepare a material flow containing a polypropylene-I component; (ii) after the first polymerization reaction is finished, reducing the amount of hydrogen to 20 wt% or below of the initial amount through separation treatment and / or replacement treatment; then a hydrogenation catalyst is introduced, and polymerization reaction is continued for 0.01-3 hours; stopping the reaction to obtain the propylene polymer containing the ultra-high molecular weight polypropylene component; the molar ratio of the hydrogenation catalyst to the residual hydrogen is 1 / 10000 to 1 / 100. According to the prepared polypropylene containing the ultra-high molecular weight component, the melt strength is remarkably improved, and meanwhile, the mechanical property, the processability and the like of the polypropylene are obviously improved.

Embodiments provide bimodal polymerization catalyst systems comprising metallocene olefin polymerization catalysts and biphenylphenol polymerization catalysts made from biphenylphenol polymerization precatalysts of Formula I.

The invention discloses flame-retardant hard foam polyether polyol ester as well as a preparation method and application thereof. The preparation method of the polyether polyol ester comprises the following steps: taking hexachlorotripolyphosphazene and hydroxy acid as raw materials, and reacting under the action of a metal chloride catalyst to obtain an intermediate; and carrying out polymerization reaction on the intermediate serving as an initiator and oxyalkylene under the action of a polymerization catalyst to prepare the polyether polyol ester. The polyether polyol ester is prepared by taking a reactant of phosphonitrilic chloride trimer and hydroxy acid as an initiator and carrying out polymerization reaction with oxyalkylene, and the prepared foam has higher flame retardance and foam strength due to the particularity of a molecular structure.

The invention discloses a supported metallocene catalyst and a preparation method and application thereof, and belongs to olefin coordination polymerization catalysts. According to the invention, the carrier is dispersed in the inert organic solvent, the metallocene catalyst is synthesized in situ in the inert organic solvent carrier, the metallocene catalyst is loaded in situ, the carrier is contacted with the metallocene catalyst, and the metallocene catalyst is firmly loaded on the surface of the carrier; the method comprises the following steps: adding an alkyl (oxy) aluminum solution with a novel structure, which is produced by a contact reaction of an alkyl aluminum solution and a toluene aqueous solution, into a carrier which is silica gel, magnesium dichloride and the like or a mixture of silica gel, magnesium dichloride and the like in any proportion, and enabling the alkyl (oxy) aluminum solution with the novel structure to be in contact with an in-situ supported metallocene catalyst to obtain the efficient supported metallocene catalyst. The activity of the prepared catalyst is adjustable in the range of 7000-25000gPE / (gcat.2 h), the suitable polymerization temperature ranges from 20 DEG C to 200 DEG C, even if the polymerization temperature reaches up to 170 DEG C, the catalyst still has high activity, and the thermal stability of the catalyst is high.

The invention relates to the technical field of coatings, and discloses a composition for a polyurethane waterproof coating, the polyurethane waterproof coating as well as a preparation method and application of the polyurethane waterproof coating. The composition contains a main agent and an auxiliary agent, the main agent is formed by polymerizing raw material components including polyol, diisocyanate A, bisphenol A epoxy acrylate and a prepolymer; the prepolymer is prepared by a method comprising the following steps: in the presence of a polymerization catalyst, carrying out contact reaction on bisphenol A epoxy resin, polyaspartic acid ester, diisocyanate B and an isocyanate tripolymer to obtain the prepolymer, the use amount molar ratio of the bisphenol A epoxy resin to the polyaspartic acid ester to the diisocyanate B to the isocyanate tripolymer is 1: (0.6 to 1.5): (0.5 to 1): (0.05 to 0.5). The coating provided by the invention is high in modulus, and has higher tensile strength, hardness and waterproof performance.

The invention discloses a viologen compound three-component doped electrochromic material as well as a preparation method and application thereof. The preparation method comprises the following steps: respectively dissolving an ethyl viologen compound, a cyano viologen compound and a methoxyl viologen compound in a DMSO solvent, and mixing according to a molar ratio of (1-6): (1-3): (1-6) to obtain a mixed solution; wherein the ethyl viologen compound is 1, 1 '-diethyl-3, 3'-difluoro-4, 4 '-bipyridine-1, 1'-dionium, and the ethyl viologen compound is one or more of ethyl viologen, ethyl viologen, ethyl viologen and ethyl viologen. The cyano viologen compound is mono (1, 1 '-bis (4-cyanophenyl)-[4, 4'-bipyridyl]-1, 1 '-dionium) monochloride; the methoxy viologen compound is mono (1, 1 '-bis (4-methoxyphenyl)-[4, 4'-bipyridyl]-1, 1 '-dionium) chloride; adding a polymerization catalyst into the mixed solution, stirring and reacting for 1.5 hours to form a reaction solution with a polymer network structure at the reaction temperature of 50-70 DEG C; introducing the reaction liquid into a film forming mold, uniformly coating a substrate with the reaction liquid by adopting a blade coating method, and carrying out heating curing and cross-linking strengthening to obtain the viologen compound three-component doped electrochromic material.

Articles, such as adhesive articles, electronic articles, and abrasive articles, including compositions disposed on a substrate are described. The composition comprises i) a cyclic olefin; ii) a ring-opening metathesis polymerization catalyst; iii) a second polymerizable material; and iv) 10 an initiator for the second polymerizable material. The second polymerizable material is selected from the group consisting of: a) an epoxide-containing component; and b) a (meth) acrylate monomer. The (meth) acrylate monomer contains an alicyclic or heteroalicyclic group. The composition comprises greater than 25% by weight of i) and greater than 25% by weight of at least one of a) or b), based on the total of i) and iii). The cyclic olefin and / or the second polymerizable 15 material is at least partially cured. Compositions and methods are also described.

A process for the continuous production of a polyolefin polymer in a gas-phase polymerization reactor in the presence of a polymerization catalyst and an antistatic agent, including the steps of (a) providing a mixture of polyolefin particles and gas, (b) conveying the mixture through a pipe at a gas velocity of greater than or equal to 2 m / s, and (c) introducing an antistatic agent into the mixture.

The present disclosure relates to a process for polymerising olefins in multistage polymerisation process configuration. The process comprises polymerising, in a reactor, first olefin monomer, optionally in the presence of at least one alpha olefin comonomer, in the presence of a polymerisation catalyst to produce a first polymer component (A); polymerising, in a downstream gas phase reactor, second olefin monomer at a first operating pressure in the presence of the first polymer component (A) and optionally in the presence of at least one alpha olefin comonomer to produce a second polymer component (B) at a production rate that provides a weight ratio of first polymer component (A) to second polymer component (B) that is below a target threshold value; and increasing the first operating pressure to a second operating pressure in the downstream gas phase reactor when the weight ratio of first polymer component (A) to second polymer component (B) increases above the target threshold value.

The invention relates to the field of rubber blanket production and processing, and particularly discloses a high-elasticity printing rubber blanket which comprises maleic anhydride grafted ethylene propylene diene monomer for a surface layer, core-shell nanoparticles, hydrogenated butadiene-acrylonitrile rubber for a compressible layer, a crystalline polyethylene glycol sacrificial template agent and a multifunctional acrylate cross-linking agent, the synergistic auxiliary agent system comprises the following components: a microcapsule self-repairing agent, a polymerization catalyst, a reactive block copolymer surfactant and flaky hexagonal boron nitride; the preparation method comprises the following steps: S1, preparing a composite sizing material; S2, integrally compounding; S3, carrying out radiation curing; and S4, carrying out post-treatment molding. A synergistic auxiliary aid system of a microcapsule self-repairing agent and a polymerization catalyst is compounded in the surface layer rubber, the healing agent can be subjected to in-situ polymerization under the action of the catalyst to repair damage, and the beneficial effects of actively inhibiting fatigue crack propagation and remarkably prolonging the overall service life of the rubber blanket are achieved.

The invention belongs to the technical field of propylene polymerization, and particularly relates to a propylene polymer directly prepared by polymerization reaction and a preparation method thereof, and the method comprises the following steps: (i) in the presence of a polymerization catalyst and hydrogen, propylene or propylene and optional one or more comonomers are subjected to a first-stage (co) polymerization reaction for 0.1-10 hours, preparing a material flow containing a polypropylene-I component; (ii) continuing to polymerize at least a portion or all of the stream containing the polypropylene-I component in a line located outside the reactor in the presence of a hydrogenation catalyst for 0.01-3 hours; then stopping the reaction to obtain a propylene polymer containing an ultra-high molecular weight polypropylene component; wherein the molar ratio of the hydrogenation catalyst to the total hydrogen in the reactor is 1 / 10000-1 / 100. According to the invention, the properties (including melt strength, tensile strength, impact strength, bending strength and the like) of a polypropylene product are remarkably improved while good processability is maintained.

Provided is a polymerizable composition that is for a resin-impregnated superconducting coil and that has excellent impregnation ability and can be used for manufacturing a resin-impregnated superconducting coil having excellent durability in a high-dose environment (in a high-dose environment in which the radiation dose per 100,000 hours is at least 1 MGy). Provided is a polymerizable composition for a resin-impregnated superconducting coil used in a high-dose environment in which the radiation dose per 100,000 hours is at least 1 MGy, the polymerizable composition comprising a norbornene-based monomer, rare-earth element-containing particles, and a metathesis polymerization catalyst.

Embodiments are directed towards the use of a supported biphenylphenol polymerization catalyst made from a biphenylphenol polymerization precatalyst of Formula I via a gas-phase or slurry-phase polymerization process under gas-phase or slurry-phase polymerization conditions to make a polymer.

The present invention addresses the problem of providing a method for producing a polyester film that uses a polyester resin that has been used and that uses at least one compound selected from the group consisting of antimony compounds, titanium compounds, and germanium compounds as a polymerization catalyst, that is not susceptible to discoloration and reduction in molecular weight even when recycled multiple times, and that has high recycling efficiency. The present invention relates to a method for producing a polyester film, the method comprising a step for mixing a recovered polyester resin (A) and a polyester resin (B) containing an aluminum compound and a phosphorus compound, the polyester resin (A) satisfying the following (1)-(3), and the polyester resin (B) satisfying the following (4). (1) The polyester resin (A) contains at least one element selected from among elemental antimony, elemental titanium, and elemental germanium. (2) The total content of elemental antimony, elemental titanium, and elemental germanium in the polyester resin (A) is 2-500 mass ppm. (3) The intrinsic viscosity of the polyester resin (A) is 0.5-0.8 dl / g. (4) The polyester resin (B) The present invention is a resin obtained by polycondensing a starting material containing di-2-hydroxyethyl terephthalate obtained by decomposing a polyester resin.

The invention relates to the technical field of tetrahydrofuran polymerization catalysts, in particular to a circular reaction device of a high-purity tetrahydrofuran polymerization catalyst and a polymerization technology.The circular reaction device comprises a base, the left side of the top of the base is fixedly connected with a reaction kettle, and the rear side of the reaction kettle is fixedly connected with a feeding mechanism; the right side of the top of the base is fixedly connected with an inert gas injection mechanism, and the left end of the inert gas injection mechanism extends to the inner wall of the reaction kettle. Accurate feeding, real-time monitoring and efficient polymerization of a high-purity tetrahydrofuran polymerization catalyst are achieved, the discharging speed and amount are accurately controlled through an electric push rod in the feeding mechanism, the purity and the component proportion of a catalyst raw material are monitored in real time in combination with a chromatographic detection head, the stability of polymerization reaction and the product quality are ensured, and the production efficiency is improved. Due to the design of a circular reaction polymerization process, the whole reaction process is carried out in an oxygen-free environment.

The invention relates to the technical field of chemical catalysis, in particular to a polyether polymerization catalyst which comprises the following components: double metal cyanide (DMC) of which the average particle size is 20-50nm, a cocatalyst of which the addition amount is 3-5% of the total mass of the catalyst, a Lewis acid-alkali pair catalyst of which the addition amount is 3-5% of the total mass of the catalyst, and a dispersing aid of which the addition amount is 1-2% of the total mass of the catalyst, the preparation method comprises the following steps: preparing a granular catalyst suitable for an industrial scale through a spray drying molding technology, improving the catalytic efficiency by 20% or more and reducing side reactions by 30% or more under the condition of 60-80 DEG C, and the generated polyether has narrow molecular weight distribution (PDilt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt and PDIt); 1.2) and a low degree of unsaturation (lt; the quality of the product is obviously improved, and the product is suitable for high-end application of polyurethane, lubricating oil and green chemicals.

The application discloses an isocyanate polymerization catalyst and a preparation method thereof, and a preparation method of polyisocyanate, and a structural expression of the catalyst is as follows: the preparation method of the polyisocyanate is that, under an inert gas atmosphere, a polyisocyanate is used as a raw material to perform a self-polymerization reaction under the catalysis of the catalyst. The catalyst has a good catalysis effect, and the reaction temperature is stable, so that the catalyst is used for preparing an isocyanate trimer product with low viscosity and good storage stability.

To provide a prepreg suitable for use in in-situ polymerizable fiber-reinforced thermoplastics, a fiber-reinforced plastic having excellent strength and solvent resistance obtained using the prepreg, and a method for producing the same.SOLUTION: A prepreg comprises a cyclic ester composition containing a cyclic ester compound and a polymerization catalyst, and a reinforcing fiber.SELECTED DRAWING: None

The invention provides a bimetallic anionic ring-opening polymerization catalyst, a preparation method and application of the bimetallic anionic ring-opening polymerization catalyst in preparation of fluorosilicone rubber with controllable molecular weight, and belongs to the field of catalysts for preparing fluorosilicone rubber. The catalyst consists of four components, namely an alkali metal compound, cyclosiloxane, an alkyl metal compound and an accelerant. The catalyst disclosed by the invention can be used for efficiently catalyzing autopolymerization of a body of 1, 3, 5-trimethyl-1, 3, 5-tri (3, 3, 3-trifluoropropyl) cyclotrisiloxane or copolymerization of the body of 1, 3, 5-trimethyl-1, 3, 5-tri (3, 3, 3-trifluoropropyl) cyclotrisiloxane and a body containing vinyl and phenyl cyclosiloxane, so that fluorosilicone rubber capable of being vulcanized at high temperature is prepared. The method has the advantages that the reaction temperature is low, a neutralizer does not need to be used for quenching an alkaline terminal, and the preparation process is simplified. By using the catalyst provided by the invention, side reactions generally caused by fluorine-containing substituent groups in the anionic ring-opening polymerization process can be effectively inhibited, so that the mechanical properties of the fluorosilicone rubber are remarkably improved. The obtained high-molecular vulcanized fluorosilicone rubber has excellent application prospects in the fields of aerospace, petrochemical engineering and the like.

The invention discloses an olefin polymerization catalyst component, an olefin polymerization catalyst and application of the olefin polymerization catalyst component, the olefin polymerization catalyst component comprises Mg, Ti, halogen, at least one internal electron donor a compound and at least one internal electron donor b compound, and the internal electron donor a compound is selected from 2, 4, 6-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1 the internal electron donor b compound is selected from a Lewis base compound, and the internal electron donor b compound is selected from a Lewis base compound; the olefin polymerization catalyst containing the catalyst component can be used for preparing polyolefin with high melt flow rate.

The invention relates to a method for continuously producing poly (p-dioxanone), which comprises the following steps: premixing glycollic acid or a glycollic acid derivative with a ring formation catalyst, and introducing the obtained mixed material and ethylene oxide into a synthesis reaction kettle for reaction; separating and purifying the obtained reaction product, introducing the obtained purified monomer into a polymerization reaction kettle, and adding a polymerization catalyst for polymerization; after polymerization is finished, discharging is conducted, residual materials in the polymerization reaction kettle are subjected to depolymerization treatment to clean the kettle body, after depolymerization is finished, depolymerization products generated in the depolymerization treatment process are discharged, the kettle does not need to be opened for cleaning, and the next round of polymerization production is directly conducted. According to the method disclosed by the invention, the steps of synthesizing the p-dioxanone monomer, separating and purifying the monomer, catalyzing and polymerizing, depolymerizing and cleaning the kettle body and the like are continuously carried out, so that the continuous production of the poly (p-dioxanone) is realized, the side reaction of oligomerization and degradation of the p-dioxanone in storage and transportation can be avoided, and the production cost of the poly (p-dioxanone) is obviously reduced.

The application discloses an olefin polymerization catalyst and a preparation method thereof, and the olefin polymerization catalyst is used for preparing a polypropylene thermoplastic elastomer, and the olefin polymerization catalyst contains silicon tetrachloride modified silicon dioxide, a transition metal component and a non-transition metal component; the transition metal component is titanium tetrachloride and / or titanium alkoxy, and the non-transition metal component is a magnesium-containing compound. The olefin polymerization catalyst has high initial activity and overall activity, and polypropylene particles with high porosity are obtained. The catalyst can obtain a polypropylene thermoplastic elastomer with high rubber content in the synthesis process of the polypropylene thermoplastic elastomer.

The invention relates to a method for producing polyacetal resin. Provided is a method for producing a polyacetal resin with which it is possible to stably and continuously produce a polyacetal resin over a long period of time while suppressing the generation of a tar-like precipitate caused by a polymerization catalyst. A method for producing a polyacetal resin, characterized by comprising a polymerization step in which a polymerization reaction is carried out using (a) a cyclic ether and / or a cyclic formal containing at least trioxymethylene, (b) boron trifluoride or a boron trifluoride complex, and (c) an organic solvent. And the organic solvent (c) is a compound represented by a predetermined formula (1).

The present invention discloses a class of perfluorophenyl-substituted salicylaldimine nickel complexes, a preparation method thereof, and an application thereof in highly active catalytic norbornene polymerization. The preparation method includes the following steps: first metallizing a neutral ligand with sodium hydride, then reacting it with a nickel metal raw material compound in an organic medium, and then obtaining the target compound through filtration, concentration, and recrystallization steps. The perfluorophenyl-substituted salicylaldimine nickel complex of the present invention is a highly efficient norbornene addition polymerization catalyst. The perfluorophenyl-substituted salicylaldimine nickel complex of the present invention has very obvious advantages: the raw materials are easily available, the synthesis route is simple, the product yield is high, the polymerization performance can be regulated by adjusting the substituent structure, and it has a wide application prospect. Its structural formula is shown as follows: