58results about How to "Narrow dispersion" patented technology

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 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 aims to provide a multilayer ceramic capacitor with high dielectric constant, a high capacitance, and an excellent reliability by eliminating oxygen vacancy in dielectric layers and suppressing oxidation of Ni inner electrodes. The multilayer ceramic capacitor comprises a multilayered dielectric body composed by alternately piling up dielectric layers containing mainly barium titanate and inner electrode layers containing mainly Ni and a first hetero-phase containing Mg—Si—O as constituent elements exists in the capacitor.

The invention discloses an alkane-bridged lignin-based polymer as well as a preparation method and an application of the lignin-based polymer. The preparation method comprises the steps of dissolving lignosulfonate in water, adding alkalis substances, and then adding polyhalogenated alkane monomer or polyhalogenated alkane monomer with aromatic rings to the reaction liquid and carrying out bridging polymerization to obtain the high-molecular-weight lignin-based polymer. The prepared lignin-based polymer has a weight-average molecular weight of 10000Da-500000Da as well as relatively low molecular weight dispersity. The lignin-based polymer disclosed by the invention has the advantages of relatively low raw material cost and rich raw material source, the process is easily operated, when the lignin-based polymer is used in the coal water slurry and titanium dioxide slurry, the dispersion properties of the lignin-based polymer can be significantly improved at a low mixing amount and the lignin-based polymer is a novel lignin-based polymer with wide application prospects.

This invention relates to a method for preparing superfine prednisolone powder, and belongs to the field of micronization. Open question at present: particle diameter of prednisolone is small but can not obtain dry powder, or the dry powder has wide size distribution, bad redispersibility, and instability in water. The invention is to realize the preparation of prednisolone granule with controllable particle diameter, narrow particle size distribution, and superfine or nano-graded quadrilate and hexagon through inverse solvent recrystallization.the prednisolone of the invention has the advantages of controllable particle diameter, narrow particle size distribution, good redispersibility, stable micropowder, and good dissolving effect; and has prodigious dominance in the development of drug effect and new medicament form.

The invention discloses azoxystrobin suspension concentrate with particle sizes of less than 100nm and a preparation method of the azoxystrobin suspension concentrate and belongs to the technical field of production of nano-pesticides. The method comprises the steps of dissolving azoxystrobin into a water-soluble organic solvent as an organic phase, adopting water as a water phase and adding a surfactant to at least one phase of water phase or organic phase; and mixing the water phase with turbulent flow of the organic phase through a fast jet hedging blending method, carrying out collection by using water or surfactant-containing water to prepare the azoxystrobin suspension concentrate. The suspension concentrate prepared by adopting the method is stable in particle size and narrow in dispersion, is smaller than 100nm, is conducive to drug adsorption on the blade surface and is capable of withstanding blowing and rain washing, osmosis and conduction to a blade can be strengthened, and the azoxystrobin suspension concentrate has the characteristics of being friendly to environment, prone to environmental degradation and high in medicinal effect.

The invention discloses a preparation method of polyester-polycarbonate-polyester multi-block copolymer and belongs to the technical field of high molecular materials. The preparation method comprises the steps that a multi-block polymerization is completed through a 'one-pot method', in another word, a Bronsted acid catalyst sequentially catalyzes cyclic lactone and cyclic carbonate for achieving ring opening polymerization, then a preset amount of tertiary amine R<3>N which is excessive relative to acid is input, wherein conjugate acid R<3>N<+>-H<delta+> formed by alkali which is equal to acid in a system in proton number serves as a hydrogen bond donor, spare alkali serves as a hydrogen bond receptor, ring opening polymerization of lactide which is finally input is catalyzed in a bifunctional mode, and the polyester-polycarbonate-polyester triple-block copolymer is finally synthesized. The preparation method has the advantages that the catalyst is simple in structure and easy to obtain, the reaction is mild and high in efficiency, the 'one-pot method' is easy and convenient to operate, the whole polymerization reaction exhibits active characteristics, the polymer molecular weight is controllable, and molecular weight distribution is narrow.

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 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.

The invention discloses a method for preparing polyether based on a three-component metal-free catalytic initiation system. The method comprises the steps of adding an epoxy monomer into a three-component metal-free catalytic initiation system containing hydroxy compounds, organic alkali and boron alkyl to react to obtain the polyether. The method is a currently known ethylene oxide room-temperature open-ring polymerization method with highest catalytic activity since the usage of organic alkali can be reduced to 40ppm and the conversion frequency can be 6000h / l. The polyether has the advantages of no metal residue and no cytotoxicity. The three-component catalytic initiation system adopts ethylene oxide open-ring polymerization, the chain transfer reaction toward the monomer and solvent can be completely avoided while the conversion frequency of 2720h / l can be obtained, and the polyether has the molecular weight of 0.1-400kg / mol, which can be accurately controlled. Furthermore, by utilizing the catalytic initiation system, the (poly) block polyether with controllable molecular weight, block sequence, block proportion and side base combination can be conveniently prepared by continuously adding 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 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.

A hexafluoropropene oxide polymer of formula (1) having a dispersity Mw / mn of up to 1.10 is useful as a raw material for liquid rubber. In formula (1), R is -COF, -I, -Br, -CH2OH, -CH2OCH2CH=CH2, -COOR1 or -CONR2R3 wherein R1, R2 and R3 are independently hydrogen or monovalent C1-20 hydrocarbon groups which may contain N, O, Si or S, or R2 and R3 form a ring with the N atom, Rf is a C1-6 perfluoroalkylene group or a C2-10 perfluorooxyalkylene group, and x+y=30 to 400.

An EEPROM (Electrically Erasable Programmable Read Only Memory) has a structure in which the corners of a floating gate electrode of each memory cell MISFET near the source region thereof are rounded.The EEPROM is manufactured by a method characterized in that the ions of an impurity at a high dose are implanted in self-alignment with the floating gate electrode and control gate electrode of the memory cell MISFET so as to form the source and drain regions thereof, whereupon an oxidizing treatment is carried out.

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 invention relates to an organic superpolymer nanometer powder for surface chemical modification and a preparation method thereof; the nanometer powder material for phosphoric acid modification is polyether polyurethane or polyether polyurethane nanometer powder, the surface of the powder is provided with phosphoric acid radical groups; the nanometer powder is prepared by the following method: in the polyether polyurethane or polyether polyurethane nanometer powder, the phosphoric acid radical groups are led in a phosphoric acid buffer system by a way of physical adsorption; the method can improve the stability and dispersibility of the powder and can change the physical, chemical and biological performances, so as to realize deep and wide application in the biology medical field. The powder particle of the nanometer powder for surface modification is from 50 nanometer to 500 nanometer, and the size is controllable, the Zeta electrical potential of the powder is negative under the physiological environment, the process route is simple, energy consumption is less without pollution, thereby providing a new concept for the surface modification of the organic superpolymer nanometer powder and expanding a road for the development and utilization of superpolymer nanometer medical materials.

The invention provides a prepolymerization catalyst for olefin polymerization and a preparation method thereof. The prepolymerization catalyst is highly active during the polymerization. At the prepolymerization stage, beside the pressure and the hydrogen additional proportion, the prepolymerization temperature, varieties of alkylaluminium, the additional proportion of the alkylaluminium and the additional speed of a monomer are also controlled, thus the prepolymerization seriflux concentration of the catalyst can reach 10g / 100ml, the particles of the prepolymerization catalyst do not agglomerate and adhere to walls. The finally generated polymerization powders do not agglomerate, the content of the fine powders is reduced obviously, the bulk density is high, and the liquidity is good.

The invention relates to a terpolymer carrier prepared by polymerizing divinyl benzene, styrene and ethylene glycol dimethacrylate and a preparation method thereof. According to the carrier, the pore diameter is 3-18nm, the specific surface area is 80-300m<2> / g, and the bulk density is 0.25-0.35g / ml. The carrier is prepared by a dispersion polymerization method, the reaction monomers divinyl benzene, styrene and ethylene glycol dimethacrylate 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 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 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 aim of the present invention is to provide a multi-branched polymer, in which branch terminals can be easily modified and which have a high degree of branching and narrow dispersion. By polymerizing a compound having 2 or more polymerization-initiation sites and polymerizable unsaturated bonds with a living radical polymerization method using a metal catalyst, it is possible to produce a multi-branched polymer with narrow dispersion and a high degree of branching and having repeating units represented by the formula (I): wherein R1 to R3 each independently represents hydrogen or a hydrocarbon group, R1 may be bonded to R3 to form a ring; X represents a connecting group having a valence of 3 or higher; Y may be the same or different and each represents a functional group which may have a halogen atom at a terminal thereof; and a is an integer of 2 or larger.

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.