58results about How to "Narrow dispersion" patented technology

The invention relates to a high-entropy carbide nano-powder and a preparation method thereof. The preparation method comprises the steps that due to a sol-gel reaction between transition metal salt and an organic carbon source, high-entropy carbide liquid precursors, evenly mixed on a molecular level, of components are obtained, and the powder is obtained through drying and high-temperature heat treatment. The method has the advantages of being simple, feasible, wide in application range and the like. The prepared high-entropy carbide nano-powder has the advantages of being small in particle size, narrow in distribution, low in oxygen content and the like. The preparation method is a new method for preparing high-entropy carbide nano-materials.

The invention relates to a method for preparing a carrier of an olefin polymerization catalyst. The carrier is a terpolymer polymerized by divinyl benzene, styrene and hydroxyethyl methylacrylate. The carrier is prepared by a dispersion polymerization method, the reaction monomers divinyl benzene, styrene and hydroxyethyl methylacrylate are sequentially added into a dispersion liquid, the particle shape of the terpolymer carrier is controlled by adding a stabilizing agent, and the pore diameter of the terpolymer carrier is adjusted by adding a pore-foaming agent. The terpolymer carrier prepared by the method is monodisperse porous microsphere, the particle size and pore diameter of the carrier are controllable, loading of a metallocene catalyst system is facilitated, and the formed catalyst has a relatively high activity.

The invention relates to an olefin polymerized metallocene catalyst system and a preparation method thereof. The catalyst is mainly prepared from an organic high-molecular polymer carrier, a co-catalyst and a metallocene compound, wherein the carrier is monodisperse porous styrene-divinyl benzene-ethylene glycol dimethacrylate terpolymer; the co-catalyst (based on the molar percentage of aluminum Al) and the metallocene compound (based on the molar percentage of metal atom M in the compound) are in a molar ratio Al:M being 75-300; and based on the molar percentage of aluminum Al, each gram of organic high-molecular polymer carrier contains 1-12mmol of co-catalyst. The preparation method mainly comprises the steps of synthesizing the organic high-molecular polymer carrier, and loading the metallocene catalyst. The preparation method is simple and environment-friendly, the prepared catalyst and polymer have good shape since a novel organic porous carrier is adopted, and the catalyst has relatively high activity.

A gel adhesive composition of the invention contains a crosslinked water-soluble polymer, water, a moisturizer, an amphipathic polymer, a water-insoluble polymer having adhesiveness, and an electrolytic salt and the composition contains the water-insoluble polymer in an amount of 3 to 20% by weight and the amphipathic polymer in an amount of 0.05 to 7.0% by weight with respect to the total amount of the composition except water.

The invention relates to a method for preparing a carrier of an olefin polymerization catalyst. The carrier is a terpolymer prepared by polymerizing divinyl benzene, styrene and hydroxyethyl methylacrylate. The carrier is prepared by a dispersion polymerization method, styrene and hydroxyethyl methylacrylate monomers are firstly added to react, the particle shape of the terpolymer carrier is controlled by adding a stabilizing agent, the pore diameter of the terpolymer carrier is adjusted by adding a pore-foaming agent, and divinyl benzene is finally added to polymerize. The terpolymer carrier prepared by the method is monodisperse porous microsphere, the particle size and pore diameter of the carrier are controllable, loading of a metallocene catalyst system is facilitated, and the formed catalyst has a relatively high activity.

The invention relates to a preparation method of modified copolymer of divinyl benzene and hydroxyalkyl methacrylate. The preparation method is characterized in that nano titanium dioxide particles are added into a copolymerization system of divinyl benzene and hydroxyalkyl methacrylate, the particle size of the nano titanium dioxide particles is in a range of 0.01 to 10 [mu]m, the weight ratio of added titanium dioxide particles to total monomers is 0.5-10:100; and a third copolymerization monomer can be added to prepare a polybasic copolymer. The modified copolymer can be used as the carrier of a catalyst for olefin polymerization; the distribution of the particle size of the carrier is narrow; and the specific surface area and particle morphology of the carrier particles can be modulated by the addition amount of titanium dioxide. The yield of solid particles prepared from copolymerization monomers is improved by the addition of hydrophilic titanium dioxide, and the obtained copolymer has good particle morphology.

The invention relates to a metallocene catalyst system for olefin polymerization and a preparation method thereof. The catalyst is mainly prepared from an organic high-molecular polymer carrier, a co-catalyst and a metallocene compound, wherein the carrier is styrene-divinyl benzene-hydroxyethyl methylacrylate terpolymer; a molar ratio of aluminum Al in the co-catalyst to metal atom M in the metallocene compound is 50-300; and based on the molar percentage of aluminum Al, each gram of organic high-molecular polymer carrier contains 1-12mmol of co-catalyst. The preparation method mainly comprises the steps of synthesizing the organic high-molecular polymer carrier, and loading the metallocene catalyst. The preparation method is simple and environment-friendly, the prepared catalyst and polymer have good shape since a novel organic porous carrier is adopted, and the catalyst has relatively high activity.

The present invention relates to bioactive hetero-coagulated mixed materials that have high strength and durability, that are prepared using an aqueous process, and that have a high transparency when placed into a monomer, polymer, or resin of approximately the same refractive index.

The invention discloses a preparation method of a shape-controlled binary metal loaded Au / Cu co-modified Sn3O4 nano composite photocatalytic material. The nano composite material is the Au / Cu co-modified Sn3O4 nano composite material obtained by placing chloroauric acid, cupric nitrate and a tin source material into a solvent, a surfactant and a reducing agent and forming chemical bond complexingamong composite ingredients of the materials by an ice salt bath and solvent combined hot wet chemical in-situ synthesis method. The composite material prepared by the invention utilizes a plasma resonance effect of Au / Cu binary metal nanoparticles, an oxygen vacancy effect of an Sn3O4 material and excellent electron conduction of Au / Cu metal nanoparticles, and implements rapid electron-hole separation in the process of cooperating photocatalytic oxidation and reduction degradation of pollutants with photocatalytic water splitting hydrogen production, thereby improving efficiency of photocatalytic water splitting and photocatalytic rhodamine B degradation of the Au / Cu co-modified Sn3O4 nano composite photocatalytic material.

A surface acoustic wave device includes a piezoelectric substrate, a comb-shaped electrode formed on a first principal face of the piezoelectric substrate, and a supporting substrate bonded to a second principal face of the piezoelectric substrate. The second principal face of the piezoelectric substrate is bonded to the supporting substrate via a metal layer. A method of manufacturing the surface acoustic wave device includes the steps of: forming a first metal layer on the second principal face of the piezoelectric substrate, forming a second metal layer on a principal face of the supporting substrate, activating the surfaces of the first and second metal layers in plasma atmosphere, bonding the first and second metal layers together at room temperature, and forming the comb-shaped electrode on the first principal face of the piezoelectric substrate.

The invention relates to a preparation method of modified copolymer of divinyl benzene and hydroxyalkyl methacrylate. The preparation method is characterized in that nano titanium dioxide particles are added into a copolymerization system of divinyl benzene and hydroxyalkyl methacrylate, the particle size of the nano titanium dioxide particles is in a range of 0.01 to 10 [mu]m, the weight ratio of added titanium dioxide particles to total monomers is 0.5-10:100; and a third copolymerization monomer can be added to prepare a polybasic copolymer. The modified copolymer can be used as the carrier of a catalyst for olefin polymerization; the distribution of the particle size of the carrier is narrow; and the specific surface area and particle morphology of the carrier particles can be modulated by the addition amount of titanium dioxide. The yield of solid particles prepared from copolymerization monomers is improved by the addition of hydrophilic titanium dioxide, and the obtained copolymer has good particle morphology.

The invention relates to a preparation method of an organic vehicle olefin polymerization catalyst. The preparation method of the organic vehicle olefin polymerization catalyst comprises the following steps: mixing alcohol with water, thus obtaining a dispersion liquid; adding a reactive monomer into the dispersion liquid, thus obtaining mixed solution; adding a stabilizer, metal oxide particles and a free radical initiator into the mixed solution, heating to 60-85 DEG C, stirring while reacting for 3-12 hours to obtain a reaction product, washing the obtained reaction product, and drying, thus obtaining a copolymer containing metallic oxide, wherein metal in the metal oxide is one or combination of more than one of metal ions in families VIII, IB, IIB and IIA; and removing metallic oxide in the copolymer containing metallic oxide, washing and drying, thus obtaining the organic vehicle olefin polymerization catalyst. The preparation method of the organic vehicle olefin polymerization catalyst has the advantages that the form and the specific surface area of an organic vehicle can be regulated, and thus the organic vehicle can be separated out from a system relatively easily, solid particles can be filtered out relatively easily, the yield of a reaction monomer is increased, and the organic vehicle with the narrow particle size distribution is obtained.

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a nano material applied to a positive electrode of a lithium-sulfur battery and a preparation method of the nano material. The nano material is ternary metal nitride nano particles. The nano material is small in particle size, high in conductivity and capable of effectively adsorbing lithium polysulfide and inhibiting the shuttle effect of lithium polysulfide. The method adopted in the preparation of the ternary metal nitride nano material is simple and convenient, the particle size and components of the prepared material are controllable, and the method has universality.

The invention discloses an alkane-bridged lignin-based polymer, a preparation method and application thereof. The preparation method is to dissolve lignosulfonate in water, add alkali substances, and then add polyhalogenated alkane monomers or polyhalogenated alkane monomers with aromatic rings to the reaction solution, and carry out bridging polymerization to obtain high molecular weight lignin base polymer. The weight-average molecular weight of the prepared lignin-based polymer can reach 10000Da-500000Da, and has relatively low molecular weight dispersion. The raw material cost of the product of the present invention is low, the source is abundant, and the process is easy to operate. It is used in coal-water slurry and titanium dioxide slurry, and its dispersion performance can be greatly improved at a low dosage. It is a new type of lignin with wide application prospects. base polymer.