415 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 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).

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.

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 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.

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.

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 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 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:

The present invention belongs to the technical field of olefin polymerization catalysts, and particularly relates to an internal electron donor, a solid catalyst component, a polymerization catalyst and the use thereof in an olefin polymerization reaction. The internal electron donor of an olefin polymerization catalyst is at least one of compounds represented by the following structural general formula (I), wherein R1-R11 are the same or different, and are each independently selected from H, halogens, C1-C10 alkyl, cycloalkyl, alkenyl and phenyl, or halogenated or N, O, S, P and Si heteroatom substituted alkyl, cycloalkyl, phenyl, alkylphenyl, phenylalkyl, indenyl and benzyl, and two or more of the R1-R9 can be bonded with each other to form a ring or bonded with each other to form an unsaturated bond. A polymerization catalyst prepared by using the compound provided by the present invention as an internal electron donor of a Ziegler-Natta catalyst achieves the advantages of high activity and good hydrogen sensitivity, and an obtained polymer achieves a high isotacticity, a relatively low content of xylene-soluble matters, and wide molecular weight distribution.

Organometallic complexes are described which are useful as pre-polymerization catalysts which may form part of olefin polymerization catalyst systems. The catalyst systems find use in the polymerization of ethylene, optionally with one or more C3-12 alpha-olefin comonomers. The organometallic complexes are broadly represented by formula I:wherein L is a bridging group containing a contiguous chain of atoms connecting P with Cy, wherein the contiguous chain contains 2 or 3 atoms and wherein Cy is a cyclopentadienyl-type ligand. The olefin polymerization catalyst system is effective at polymerizing ethylene with alpha-olefins in a solution phase polymerization process at high temperatures and produces ethylene copolymers with high molecular weight and high degrees of alpha-olefin incorporation. Pre-metallation compounds, metallation processes and synthetic methods to make the organometallic complexes as well as polymerization processes are also described.

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 present invention provides an ionic polynorbornene crosslinked anion exchange membrane and a preparation method therefor and a use thereof. The membrane prepared in the present invention has a smooth and transparent surface, has excellent conductivity, stability and mechanical properties, and can be applied to the fields of fuel cells, electrolyzed water, electrodialysis, acid recovery, etc. The preparation method of the present invention is simple to operate, and fewer polymerization catalysts can be used when combined with a chain transfer agent, thereby reducing costs; and scale-up production and roll-to-roll continuous preparation can be achieved, providing a guarantee for industrial production and application of membranes.

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 invention discloses a method for preparing PET (Polyethylene Terephthalate) by polycondensation of high-purity monohydroxyethyl terephthalate under mild conditions, which comprises the following steps of: stirring and reacting monohydroxyethyl terephthalate and ethylene glycol in inert atmosphere at the temperature of 180-230 DEG C for 3-12 hours; and adding a condensation polymerization catalyst into the reaction product, and stirring and reacting for 2-6 hours in an inert atmosphere under the conditions that the temperature is 260-290 DEG C and the vacuum is 40-150 Pa to prepare PET (Polyethylene Terephthalate). According to the preparation method, high-purity monohydroxyethyl terephthalate is used as a polymerization monomer raw material, and PET which meets the current commercially available product standard and is prepared under mild conditions is explored. In addition, based on the current situation that the preparation cost of the high-purity monohydroxyethyl terephthalate is too high, the invention provides a low-cost method for preparing the high-purity monohydroxyethyl terephthalate under a mild condition.

The invention provides a synthetic method of PETG (polyethylene terephthalate glycol), which comprises the following steps: ester exchange: carrying out ester exchange on bis (2-hydroxyethyl) terephthalate and 1, 4-cyclohexanedimethanol under the catalysis of an ester exchange catalyst to obtain an ester exchange product; pre-polycondensation: constructing a reaction system by using the bis (2-hydroxyethyl) terephthalate, the ester exchange product obtained in the ester exchange step, a polymerization catalyst and a stabilizer, heating the reaction system to 270-273 DEG C, reducing the pressure to be less than or equal to 10kPa, and carrying out pre-polycondensation; medium polycondensation: after the pre-polycondensation is completed, heating the reaction system to 273-275 DEG C, continuously reducing the pressure to be less than or equal to 1kPa, and continuously performing polycondensation; and final polycondensation: after the intermediate polycondensation is completed, heating the reaction system to 280-283DEG C, reducing the pressure to be less than or equal to 100Pa, and carrying out final polycondensation to obtain the PETG. BHET and ester exchange products are subjected to condensation polymerization in a multi-stage vacuum and stepped heating mode, small molecule by-products are effectively removed in the condensation polymerization process, and the polymerization degree is promoted to be improved.

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.

The present invention relates to a process for preparing a catalyst for olefin polymerization. Specifically, the present invention relates to a process for preparing a supported metallocene catalyst capable of producing a polyolefin in which the formation of gels is suppressed. In the process for preparing a supported metallocene catalyst according to an embodiment of the present invention, it is treated with a metallic stearate after a transition metal compound has been supported, which suppresses the formation of a macromolecular polyolefin. Thus, a polyolefin with minimal gel formation can be prepared.