196 results about "Polymerization catalysts" patented technology

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 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 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.

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 disclosure relates to a solid component for producing an olefin polymerization catalyst, its production method, and its use. The solid component contains (i) a magnesium compound represented by the following formula (1), (ii) a Lewis base (LB), and (iii) optionally a metal component other than magnesium, where LB is a compound represented by the general formula (II) or an amide compound represented by the general formula (II'). The solid component produced in the present invention has a good particle morphology, and a catalyst produced by using the solid component as a support is less likely to be crushed and has better stereostructure orientation in olefin polymerization, particularly propylene polymerization or copolymerization. [Formula 1] JPEG2023546624000060.jpg41169

The application discloses a rusted anti-rust reflective heat-insulating coating containing tung oil coated flaky zinc powder and belongs to the technical field of zinc powder modification. According to mass fractions, the rusted anti-rust reflective heat-insulating coating comprises the following components: 5-10 parts of natural tung oil, 60-65 parts of flaky zinc powder, 10-15 parts of aluminum silver paste, 1-2 parts of lubricant, 2-4 parts of adhesion promoter, 8-12 parts of high molecular epoxy resin water-based dispersion, 0.5-1 part of polymerization catalyst and 5-10 parts of cosolvent. The rusted anti-rust reflective heat-insulating coating containing tung oil coated flaky zinc powder can reduce the reaction between zinc powder and water in the water-based emulsion, improve the storage stability of the zinc powder, and make the zinc powder not lose the cathode protection and shielding protection due to the early reaction. The preparation method is simple, raw materials are easy to obtain, and the cost is low.

A polymerization catalyst composition contains a rare earth element carboxylate, a phosphate ester represented by the following general formula (1):[Formula 1]O═P(OR)3  (1)(wherein Rs are each independently an alkyl group having 5 to 20 carbon atoms), and water.

The present invention relates to a method for producing a neodymium(III) alkyl phosphate solution, the method comprising the following steps: (a) reacting a neodymium(III) compound with an organic phosphoric acid in a solvent in the presence of an accelerator, thereby obtaining a neodymium(III) alkyl phosphate solution, (b) adding an antigelling agent to the neodymium(III) alkyl phosphate solution obtained in step (a), and (c) removing water formed and / or added during step (a) from the obtained neodymium(III) alkyl phosphate solution, thereby obtaining a solution containing neodymium(III) alkyl phosphate. The present invention also relates to the neodymium(III) alkyl phosphate solution obtained by the above method and to the use of this solution as a catalyst precursor for diene polymerization.

To provide a method of manufacturing a solid catalyst component for polymerizing olefins giving a catalyst capable of manufacturing olefin polymers that does not too lower catalyst activity and is excellent in stereoregularity, when polymerizing olefins by a catalyst using the solid catalyst component containing titanium, halogen, magnesium, an internal electron donating compound and an alkoxy group.SOLUTION: A manufacturing method of a solid catalyst component for polymerizing olefins characterized by comprising a first generation step for obtaining a contact product by mutually contacting titanium tetrachloride, a magnesium compound, an internal electron donating compound and an inert organic solvent, a cleaning step for cleaning the contact product obtained in the first generation step with an inactive organic solvent to obtain a cleaned product, and a second generation step for mutually contacting the cleaned product obtained in the cleaning step, silicon tetrachloride, organic acid chloride or metal chloride and the inactive organic solvent to obtain a solid catalyst component.SELECTED DRAWING: None

The present invention relates to a catalyst for propylene polymerization, a catalyst system for propylene polymerization and preparation and use thereof. The catalyst for propylene polymerization comprises: an activated magnesium halide, a titanium compound supported on the activated magnesium halide containing at least one Ti-halogen bond, and an internal electron donor compound selected from one or more of compounds having a structure of below Formula (1), wherein R1 and R6 are each independently selected from a C1-C12 straight or branched alkyl, a C3-C15 cycloalkyl or aryl, and R′ is H, a C1-C5 straight or branched alkyl, or phenyl; R2, R3, R4, and R5 are each independently selected from H, halogen, a C1-C12 straight or branched alkyl, a C3-C8 cycloalkyl, a C6-C15 aryl, or arylalkyl. The present invention can provide a catalyst showing high polymerization reaction activity and excellent stereospecificity, by applying a novel type of internal electron donor.

The invention discloses a guanidyl zinc / aluminum complex as well as a preparation method and application thereof, and relates to the technical field of polymerization catalysts. The guanidyl zinc / aluminum complex prepared by the invention has a single catalytic activity center, and accurate control on the structure and molecular weight of a polymer can be realized by regulating and controlling a ligand structure, metal types and polymerization conditions. The catalyst has the remarkable advantages of low toxicity, low cost, simplicity in synthesis, high catalytic activity, stable performance and the like, and is suitable for lactone ring-opening polymerization reaction. Under the protection of inert gas, the polycaprolactone has excellent activity when catalyzing polymerization of lactide, caprolactone and other lactone monomers, the molecular weight of the obtained polycaprolactone is up to 219.2 kg / mol, and an effective way is provided for preparation of high-molecular-weight polyester. In addition, the catalyst can still keep high activity and stability under simulated industrial conditions, and has wide industrial application prospects.

This invention relates to a process for feeding a polymerization catalyst into a polymerization reactor, the process comprising the following steps: (i) forming a catalyst slurry comprising oil and solid catalyst components in a first catalyst preparation container; (ii) conveying the catalyst slurry from the first catalyst preparation container to a first catalyst feed container; (iii) maintaining the catalyst slurry in the first catalyst feed container in a homogeneous state; (iv) discharging a portion of the catalyst slurry from the first catalyst feed container, preferably continuously discharging the catalyst slurry from the first catalyst feed container, and introducing the discharged portion of the catalyst slurry into the polymerization reactor; wherein, when located within the first catalyst preparation container and the first catalyst feed container, the dynamic viscosity of the oil is 25 to 1500 mPa*s; wherein the catalyst slurry is conveyed from the first catalyst feed container downward along a substantially vertical path into the polymerization reactor.

A process for preparing polyolefins including the step of:polymerizing an olefin in the liquid phase in the presence of a polymerization catalyst and an antistatic composition, thereby forming a polymer slurry,wherein the polymer slurry is conveyed in a transfer line including a horizontal section and a series of vertical sections connected by bent sections, with the antistatic composition injected in the first portion of the first section of the series of vertical sections.

The present invention relates to a method of repairing pipe and tank surfaces using a poly fill and coated fabrics. The invention relates to a method of repairing pipe and tank surfaces by applying a poly fill and PTFE coated e-glass fabric patches or wraps to both synthetic polymer and / or non-synthetic polymer pipe and tank surfaces. The method utilizes a synthetic polymer preparation solution to prepare the synthetic polymer surface for the molecular integration, a polymerization catalyst as well as a heating source for activating and accelerating the molecular integration process, and a surface-insensitive bonding agent formulated to react with the pipe or tank surfaces for a more consistent, and reliable molecular integration.

The invention provides an olefin polymerization catalyst carrier as well as a preparation method and application thereof. The olefin polymerization catalyst carrier comprises a composition shown in a formula (I), and in the formula (I), R1 is selected from C1-C14 alkyl groups or C3-C14 cycloalkyl groups; r2 and R3 are the same or different, and are respectively and independently selected from H, C1-C5 alkyl or C1-C5 halogenated alkyl; x is selected from halogen; m is 0.1-1.9, n is 0.1-1.9, and m + n = 2; c1 is selected from aminophenol compounds, 0 lt; q < = 0.5. The carrier is good in morphology, particles are not adhered, the carrier is in a good spherical shape, the particle size of the particles is small, and the particle size distribution is narrow. The catalyst prepared by adopting the carrier to carry out titanium loading has better catalytic activity and ethylene copolymerization capability when being used for olefin polymerization, is sensitive to hydrogen response, and can be used for preparing polymer products with higher bulk density.

The invention relates to the field of polypropylene material preparation, and discloses a polypropylene random copolymer material, a preparation method thereof and a medical infusion soft bag heat sealing layer material. The method comprises the following steps: (1) in the presence of a first olefin polymerization catalyst, carrying out pre-homopolymerization on first propylene to obtain a propylene prepolymer; (2) performing a first gas phase copolymerization reaction on first ethylene, second propylene, first butylene-1, hydrogen, a second olefin polymerization catalyst and the propylene prepolymer to obtain a first copolymerization product; and (3) performing a second gas phase copolymerization reaction on second ethylene, second butylene-1 and the first copolymerization product. According to the invention, through pre-homopolymerization and two gas phase copolymerization reactions, stable production of polypropylene with high butylene and ethylene monomer content is realized, and the prepared polypropylene is not easy to cake, low in melting point and low in initial heat-sealing temperature, and can be used for a heat-sealing layer material of a medical infusion soft bag.

The invention discloses a titanium-magnesium catalyst for a slurry polymerization process and a preparation method of the titanium-magnesium catalyst, and belongs to the technical field of olefin polymerization catalysts. The catalyst comprises a composite carrier and a titanium active component loaded on the carrier, the composite carrier is composed of an MgCl2 matrix and a TiO2 nanofiber; the TiO2 nanofibers form a radial through pore framework in the carrier; from the core to the surface of the carrier particle, the crystallinity of MgCl2 is distributed in a gradient increasing manner. The preparation method comprises the following steps: preparing TiO2 nanofibers by an alkaline hydrothermal method, dispersing the TiO2 nanofibers in a MgCl2 ethanol solution, carrying out spray drying to obtain composite particles, and carrying out gradient heating to construct a crystallinity gradient; performing high-temperature calcination to crystallize the TiO2 fibers; and loading TiCl4 to obtain the catalyst. The catalyst disclosed by the invention is subjected to stripping type controllable crushing from inside to outside in slurry polymerization, the content of polymer fine powder is effectively reduced, the problem of scaling of a reactor is greatly solved, and the operation cycle of a device is remarkably prolonged.

Olefin coordination polymerization catalyst, wherein the catalyst consists of a primary catalyst mainly composed of a magnesium compound, a transition metal halide, a C 2-15 -alcohol and an electron donor in a molar ratio of 1:13-35:0.3-8.5:0.45-1.7, and a co-catalyst which is an organoaluminium compound, where the molar ratio of the transition metal halide to the co-catalyst is 1:10-500, wherein the electron donor is a four-armed organoheteroether compound, and the four-armed organoheteroether compound is selected from at least one of the following compounds wherein the magnesium compound is selected from magnesium dichloride or magnesium diethoxide and the transition metal halide is selected from titanium tetrachloride.

A cosmetic or pharmaceutical composition contains at least one polymer precursor and at least one polymerization catalyst in the presence of which the at least one polymer precursor polymerizes under the action of light. Also, a process for skin tautening, skin fixation and / or wrinkle reduction includes an elastic, wearable polymer layer being formed on the skin when a polymer precursor and a polymerization catalyst are topically applied on the skin area to be treated and the skin area to be treated is subsequently exposed to light.

The embodiment of the invention provides an asymmetric brush polymer and a preparation method thereof. The preparation method comprises the following steps: step S1, enabling 5-norbornene-2-exo, 3-exo-dimethanol to react with 2-(dodecyl thiocarbon thio) propionic acid, so as to obtain a norbornene derivative with 2-(dodecyl thiocarbon thio) propyl ester and a hydroxyl unit at the same time; s2, enabling the norbornene derivative to react with caprolactone and methyl acrylate by utilizing a light irradiation reaction system in the presence of a ring-opening polymerization catalyst and a photocatalyst, so as to obtain an asymmetric macromonomer containing polymethyl acrylate and polycaprolactone block units at the same time; s3, enabling the asymmetric macromonomer to react in the presence of a Grubbs catalyst, so as to obtain the asymmetric brush type polymer. By applying the technical scheme provided by the invention, the technical problems that in the prior art, the synthesis steps of the asymmetric brush type polymer are tedious, multiple purification is needed, and the molecular weight and distribution of the polymer are difficult to effectively control can be effectively solved.

The utility model discloses treatment equipment based on a polytetrahydrofuran polymerization catalyst, and relates to the technical field of chemical equipment. The treatment equipment based on the polytetrahydrofuran polymerization catalyst comprises a base, a treatment box is fixed above the base, a filter box is placed in the treatment box, a supporting block is fixed to the bottom of the inner wall of the treatment box, the filter box is placed above the supporting block, a filter screen is detachably installed at the bottom of the filter box, and a cover body is installed at the top of the treatment box. The cover body is provided with a rotating assembly used for stirring treatment liquid in the filter box and scraping away accumulations on the filter screen; the design of the filter box in the equipment allows the filter screen to be detachably mounted and is convenient to clean and replace, in addition, through a stirring plate and a scraping plate in the rotating assembly, treatment liquid in the filter box can be stirred, impurities accumulated on the filter screen can be scraped, the filter screen is effectively prevented from being blocked, and the filtering efficiency is improved.

This invention relates to an asymmetric polypyrrole nanopillar array thin film, its preparation method, and its application in gas sensors. The method includes the following steps: immersing a flexible, biodegradable porous filter membrane in a polymerization catalyst solution; adding a pyrrole dispersion dropwise to the polymerization catalyst solution with the porous filter membrane immersed in it, followed by freezing and static reaction; removing the reacted porous filter membrane, washing, and drying it; performing surface treatment on one side of the dried porous filter membrane; placing the surface-treated porous filter membrane in a solvent to remove the porous membrane, and then washing and drying it to obtain the asymmetric polypyrrole nanopillar array thin film, which is used to construct a gas sensor. Compared with existing technologies, the preparation method of this invention mainly involves impregnation and dropwise addition. Through simple dip-coating and oxygen plasma surface treatment steps, the asymmetric polypyrrole nanopillar array thin film is prepared without the need for prolonged ultrasonication, simplifying the process.

A catalyst system for the polymerization of a mixture comprising olefins includes a selectivity control agent comprising at least one silicon-containing compound containing at least one C1-C10 alkoxy group bonded to a silicon atom and an amount of one or more reagent compounds. The reagent compound comprises a C2-C13 monocarboxylic ester or polycarboxylic ester of aliphatic C2-C7 carboxylic acid and an inert substituted derivative of the C2-C13 monocarboxylic ester or polycarboxylic ester. One or more polymerization catalysts may also be present. A polymerization process includes contacting an olefin or a mixture of an olefin and one or more copolymerizable comonomers with a catalyst composition under polymerization conditions.

The present invention provides an insulating resin composition which has excellent thermal conductivity and excellent heat resistance and which can be highly filled with a thermally conductive filler, and a circuit board which uses said insulating resin composition. A circuit board according to the present embodiment comprises a first metal layer, an insulating layer, and a second metal layer in this order, wherein one of the first metal layer and the second metal layer is a metal substrate, and the other is a circuit. The insulating layer includes: a porous insulating layer containing a first polymerization catalyst and an epoxy resin homopolymer including a mesogenic backbone; and an adhesive containing a thermosetting resin and a second polymerization catalyst, wherein the adhesive infiltrates into the porous insulating layer, a part of the adhesive which has infiltrated discontinuously forms an adhesive layer between the first metal layer and the porous insulating layer, the mass ratio of the epoxy resin homopolymer including a mesogenic backbone and contained in the insulating layer to the sum of resin components contained in the porous insulating layer and the adhesive is 80 mass% or more, and the first polymerization catalyst and the second polymerization catalyst are basic polymerization catalysts.

Described herein are palladium-based polymerization catalysts having a diimine ligand and a fluorinated ester chelate. Also described herein are polymers formed using palladium-based polymerization catalysts, where the polymers have a terminus having a structure including a fluorinated alkane, alkene or alkyne, a fluorinated aromatic, a fluorinated cycloalkane or cylcoalkene, a fluorinated heteroaromatic, or a fluorinated heterocyclic.

This invention relates to the field of butadiene polymerization technology, and particularly to a butadiene polymerization catalytic system, preparation method, and butadiene polymerization method. The butadiene polymerization catalytic system includes component A, component B, component C, and component D. Component B is an alkylaluminum compound, component C is a boron trifluoride complex, and component D is a homogenizing agent. Component A consists of two parts: component A1 and component A2, wherein component A1 is nickel organophosphate, and component A2 is alkyl nickel acid with a cyclic structure. The preparation process of the catalyst of this invention is simpler, and the product has higher purity, a more defined composition, and a wider and more abundant supply of raw materials, thereby achieving the goals of reducing costs and stabilizing the production process and product quality. Using the technical solution provided by this invention for the production of nickel-based cis-butadiene rubber results in a high polymerization conversion rate of butadiene monomer, good physical and mechanical properties of the product, and low gel content.

A method of making a poly (ether-carbonate) polyol comprises a polymerization stage comprising polymerizing carbon dioxide and at least one alkylene oxide with a starter in the presence of a double metal cyanide polymerization catalyst and a catalyst promoter free of halogen anions and cyanide ions. The catalyst promoter is separated from the double metal cyanide polymerization catalyst.