15 results about "Organometallic catalysis" patented technology

The application relates to the technical field of batteries, in particular to a hard carbon negative electrode material and a preparation method and application thereof. A preparation method of a negative electrode hard carbon material comprises the following steps: carrying out first heat treatment on a mixture of an organic metal catalyst and biomass activated carbon, introducing a gas-phase carbon source and carrying out second heat treatment to obtain first material, and carrying out carbonization treatment and acid pickling treatment on the first material. The method can improve the capacity and initial efficiency of the hard carbon negative electrode material through cooperation of various steps; the method is simple in process and easy to realize large-scale production.

An alkoxysilyl-containing polyurethane polymer composition is prepared using a urethane-forming organometallic catalyst which is then stabilized to moisture exposure by the addition of a mercapto-containing compound. The stabilized moisture-curable alkoxsilyl-containing polyurethane polymer composition is activated to moisture curing by the addition of a hydrolysis and condensation catalysts. The stabilized moisture-curable alkoxsilyl-containing polyurethane polymer composition is useful as a component in the preparation of coatings, adhesives, sealants, consumer goods and industrial goods.

The application discloses a method for recovering lactic acid methyl ester by catalytic depolymerization of polylactic acid in one pot. The method comprises the following steps: mixing polylactic acid, amine nitrogen ligand and methanol, dissolving by adding a solvent, and then adding a n-butyllithium solution to carry out a depolymerization reaction; and after the reaction is completed, the solvent is removed by vacuum distillation, and the crude product is dried in vacuum to obtain lactic acid methyl ester product. The application does not need to synthesize a complex organic metal catalyst, the depolymerization condition is mild, and the generation of by-products such as low-molecular-weight oligomers is effectively reduced. Therefore, the application has the advantages of simplifying the catalyst preparation process, improving the depolymerization efficiency, reducing the cost and the like, and is suitable for industrialized recovery and cyclic utilization of polylactic acid.

This invention discloses an ultra-low friction lubricating material system with self-catalytic effect and its preparation method, belonging to the field of lubricant technology. The ultra-low friction lubricating material system is composed of a base oil, an organometallic catalyst, and organic additives. The organometallic catalyst is at least one selected from ferrocene, cobalt carbonate, cobalt oxalate, copper acetate, and nickel oxalate. The organic additives are at least one selected from o-xylene, ethylene glycol, dodecanol, oleic acid, and tetraethyl orthosilicate. During friction, the organometallic catalyst releases metal ions, which, under the action of frictional heat and contact pressure, catalyze the base oil components to form a carbonaceous lubricating film in situ on the surface of the friction pair. The organic additives provide an additional carbon source during friction, working together with the organometallic catalyst to reduce the break-in time for the friction pair to reach a stable state. This lubricating material system not only significantly reduces the coefficient of friction and wear rate but also significantly shortens the break-in time.

The application discloses a flocculant for concrete mixture water-washed sand and a preparation method thereof. The flocculant is in a spherical configuration and is composed of a polystyrene inner core and a large number of polyacrylamide coating layers grafted on the surface of the polystyrene inner core. The preparation method comprises the following steps: firstly, preparing a styrene / hydroxyethyl acrylate / methoxy-terminated polyethylene glycol alkene copolymer P through free radical polymerization; then, performing ring-opening polymerization on the copolymer P by taking alpha-halogen-gamma-lactone as a polymerization monomer under the action of an organic metal catalyst to obtain a grafted poly(alpha-halogen-gamma-lactone) polymer S; then, adding magnesium powder to prepare a Grignard reagent polymer S-Mg-X; then, introducing carbon dioxide and hydrogen to prepare a carboxylic acid polymer S-COOH; then, filtering and removing magnesium carbonate precipitate; and finally, adding ammonia to perform amidation reaction to prepare the flocculant. The machine-made sand prepared by using the flocculant for concrete mixture water-washed sand has excellent initial plasticizing performance and good plasticizing retention capacity.

The purpose of this invention is to provide a moisture-curing composition that exhibits high elongation, high strength, and excellent heat resistance after curing. This invention provides a moisture-curing composition containing the following components (A) to (C): (A) an organic polymer having two or more alkoxysilyl groups within its molecule; (B) an organometallic catalyst; and (C) an aromatic secondary amine compound.

Provided is a method for preparing Compound II, wherein the method includes the following steps: using Compound I as a raw material, performing a reaction under the action of an organometallic catalyst and a phase transfer catalyst, and oxidizing with hydrogen peroxide to obtain Compound II. The catalyst utilized in the present application exhibits remarkably high activity for the oxidation of sulfur ether compounds, leading to the preparation of sulfone compounds. The method for preparing Compound II significantly reduces the amount of catalyst required, effectively diminishing the consumption of non-renewable scarce strategic resources, while concurrently reducing the potential hazards to the natural environment. The novel method exhibits a substantial reduction in the amount of catalyst required, leading to a concurrent decrease in the consumption of non-renewable resources. Concurrently, it significantly mitigates potential harm to the natural environment and human health. The solvent utilized in this method is easy to be recycled and reused, and enhances overall process efficiency by reducing resource consumption, waste generation, and treatment costs, thereby rendering it more suitable for industrial production.

A manufacturing process for a one-component polyurethane-modified epoxy resin emulsion, characterized in that it comprises the following steps: mixing epoxy resin, monohydroxy acrylate, dialkyl maleate, ketone solvent, aprotic polar solvent, and polymerization inhibitor to obtain a mixed solution, wherein the epoxy resin has an epoxy equivalent of ≥ 300 g / equivalent; mixing polyethylene glycol, polyether diol and / or polyester diol, diisocyanate, and organometallic catalyst, and carrying out an addition polymerization reaction to obtain a polyurethane prepolymer; mixing the mixed solution and the polyurethane prepolymer, carrying out an addition reaction, emulsification with the addition of water, and subsequent removal of the ketone solvent to obtain a water-based polyurethane epoxy emulsion.Mixing the water-based polyurethane epoxy emulsion with alkyldiamine, carrying out a Michael addition-ring-opening addition reaction to obtain a one-component polyurethane-modified epoxy resin emulsion, wherein the dialkyl maleate comprises one or more of diethyl maleate, dibutyl maleate and diisooctyl maleate.

The application discloses a corncob sugar residue / castor oil-based coated controlled-release fertilizer and a preparation method thereof. The coated controlled-release fertilizer is prepared by the following method: (1) mixing corncob sugar residue and a polyol to carry out a liquefaction reaction to obtain liquefied corncob sugar residue-based polyol A; (2) mixing the liquefied corncob sugar residue-based polyol A and castor oil at room temperature to obtain coated raw material B; (3) mixing isocyanate and an organic metal catalyst at room temperature to obtain coated raw material C; (4) mixing the coated raw material B and the coated raw material C at room temperature to obtain coated controlled-release raw material D; and spraying the coated controlled-release raw material D on the surface of core fertilizer particles to carry out an in-situ polymerization reaction, so that the corncob sugar residue / castor oil-based coated controlled-release fertilizer is prepared. The fertilizer is not only green and environment-friendly, but also can effectively improve the utilization rate of the fertilizer, the initial release rate of nutrients is less than 10%, and the cumulative release period is more than 30 days.

This invention provides a method for preparing compound II. The method uses compound I as a raw material, reacting it under the action of an organometallic catalyst and a phase transfer catalyst in the presence of hydrogen peroxide oxidation to obtain compound II. The catalyst used in this invention exhibits extremely high activity for the preparation of sulfone compounds from sulfide oxides. This preparation method significantly reduces the amount of catalyst used, effectively reducing the consumption of non-renewable and scarce strategic resources, while greatly reducing potential harm to the natural environment and human health. The solvent used is easily recyclable and reusable. The overall process is more efficient, consumes fewer resources, produces less waste, and has lower waste treatment costs, making it more suitable for industrial production.

This invention discloses a novel bisphosphine ligand, its preparation method, and its applications, belonging to the field of organometallic catalysis technology. The invention utilizes a chemical synthesis method, starting with ferrocene or 1,1'-dimethylferrocene, followed by butyl lithiation (or bromination), introduction of an aldehyde group (or palladium-catalyzed hydromethyl esterification), aldehyde reduction (or ester reduction), halogenation of the hydroxyl group (or bis-OTf oxidation), and condensation with a lithium phosphine reagent (or direct Herrman-Beller catalytic coupling), to obtain the novel bisphosphine ligand based on the ferrocene framework. The catalytic complex of this bisphosphine ligand and palladium exhibits excellent catalytic activity and selectivity in the alkoxycarbonylation reactions of terminal alkenes, internal alkenes, and polysubstituted alkenes.

The present application relates to a polyurethane composition for preparing a composite material, a polyurethane composite material prepared by the polyurethane composition and a method for preparing the polyurethane composite material. The polyurethane composition comprises: a) an isocyanate component; b) an isocyanate-reactive component; c) a free radical reaction initiator and d) an organic metal catalyst; the hydroxyl value of the isocyanate-reactive component of the component b) is 200 mgKOH / g-700 mgKOH / g, and the molar ratio of isocyanate groups to hydroxyl groups of the composition is 0.6-1.5. The polyurethane composition of the present application has the advantages of long workable time and simple construction process, and the polyurethane composite material comprising the polyurethane resin matrix prepared by the polyurethane composition of the present application has excellent weather resistance and mechanical strength.

The present invention aims to provide a moisture-curable composition having high elongation, high strength, and excellent heat resistance. The present invention provides a moisture-curable composition comprising the following components (A) to (C): (A) component: an organic polymer having two or more alkoxysilyl groups within its molecule; (B) component: an organometallic catalyst; (C) component: an aromatic secondary amine compound.

This invention belongs to the field of adhesive technology, specifically relating to a UV / moisture dual-curing adhesive and its preparation method. The dual-curing adhesive comprises the following raw materials in parts by weight: 75-90 parts polyurethane acrylate prepolymer, 10-25 parts curing agent, 1-5 parts photoinitiator, 0.01-0.1 parts organometallic catalyst, 0.1-0.3 parts polymerization inhibitor, 1-3 parts coupling agent, and 3-5 parts fumed silica. The polyurethane acrylate prepolymer is prepared by reacting diisocyanate, diol, and hydroxyl acrylate; the diol is a compound of hydrogenated hydroxyl-terminated polybutadiene and polyether diol; the curing agent has a specific molecular structure containing two isocyanates and one unsaturated double bond, which can respond to UV curing and moisture curing respectively, synergistically achieving photocuring and moisture curing with the polyurethane acrylate prepolymer, ensuring uniform overall curing of the adhesive, no uncured residue, improved mechanical properties, and low allergenicity; viscosity is adjusted by regulating the relative amounts of polyurethane acrylate prepolymer and curing agent.

This invention discloses an adhesive for repairing photovoltaic (PV) modules, a preparation method thereof, and a method for repairing PV modules. The adhesive includes: a first adhesive, or a first adhesive and a second adhesive; when both are present, the second adhesive and the first adhesive are stored independently. The first adhesive includes: a glue prepolymer formed by the reaction of multiple raw materials; the multiple raw materials include at least 100 parts of epoxy acrylate resin, 3-5 parts of an organometallic catalyst, and 8-15 parts of a compound containing diisocyanate groups. The second adhesive includes liquid silica gel and fumed silica dispersed in the liquid silica gel; the liquid silica gel includes α,ω-dihydroxypolydimethylsiloxane, methyl silicone oil, a crosslinking agent, a coupling agent, a diluent, and a catalyst. Through the synergistic effect of the components in the first adhesive, this adhesive possesses toughness, high strength, and low water permeability, ensuring the reliability of the adhesive in repairing PV modules.