144 results about "Dispersion polymerization" patented technology

The invention discloses an ultra-low-density high-strength resin proppant capable of being carried by clear water or low-viscosity slickwater. The proppant is prepared by dispersing, polymerizing and curing a mixture comprising 15 to 50 weight percent of vinyl monomer, 5 to 10 weight percent of acrylate monomer and 50 to 70 weight percent of unsaturated resin. The preparation method comprises the following steps: controlling the resin composition in a water phase by virtue of a dispersing agent and a rotating speed to form spherical liquid drops with the particle size of 12-140 meshes and the sphericity of nearly 100%; then, the temperature ranges from 30 DEG C to 80 DEG C; the propping agent provided by the invention has ultra-low density, can be carried by clear water or low-viscosity slickwater, is suitable for low-viscosity fracturing fluid, low-displacement construction and small-scale fracturing, can realize ultra-far-end seam net support, and greatly increases the oil and gas drainage area. The breaking rate under the closing pressure of 20-90 MPa is lower than 2%, the surface is weakly lipophilic, and the oil-phase flow conductivity is higher than the water-phase flow conductivity.

The invention discloses a magnetic porous microsphere for in-vitro diagnosis and a preparation method of the magnetic porous microsphere, and belongs to the technical field of preparation of micro-nano materials. According to the invention, styrene is used as a polymerization monomer, and a dispersion polymerization method is adopted to prepare monodisperse polystyrene microspheres; ferric chloride and ferrous sulfate are selected as precursors, magnetic nanoparticles are synthesized through a coprecipitation method under the alkaline condition, the initial loading capacity is changed, the magnetic nanoparticles are loaded on the surfaces and in pore channels of polymer porous microspheres through a multi-step seed growth method, and the magnetic nanoparticles are prepared. The composite magnetic polystyrene microspheres with high magnetic content, good magnetic responsiveness and superparamagnetism are synthesized; finally, functional groups are introduced to the surfaces of the magnetic spheres by monomers containing the functional groups through a monomer swelling polymerization method, and the prepared magnetic porous microspheres have the advantages of uniform particle size, small coefficient of variation and large specific surface area, and can be better combined with antigens and antibodies, so that in-vitro diagnostic function detection such as nucleic acid extraction and chemiluminescence is carried out.

The invention relates to the technical field of filler preparation, and discloses an analysis filler for separating glycosylated hemoglobin and a preparation method thereof.The analysis filler for separating glycosylated hemoglobin is obtained by synthesizing nonporous Polymer microspheres of 5 micrometers through a dispersion polymerization method, conducting hydrophilic treatment on the surfaces of the Polymer microspheres to obtain Polymer base balls and finally introducing ion exchange groups to the Polymer base balls. The hydrophilicity of the surface of the matrix is enhanced through hydrophilization treatment, non-specific adsorption is reduced, meanwhile, the swelling property of the filler in water is not affected, and the mechanical strength is not affected. The glycosylated hemoglobin analysis filler which is uniform in granularity, good in separation effect and long in service life can be obtained through the preparation method of the analysis filler.

The present invention provides a method for preparing porous functional microspheres, comprising the following steps: A) mixing a polymerization monomer, an initiator, a dispersant, a cross-linking agent and a functional monomer in a dispersion medium, reacting to obtain monodispersed functional microspheres; B) dispersing the monodispersed functional microspheres in a good solvent and stirring to obtain monodispersed porous functional microspheres; the good solvent is a solvent with a solubility of 8.0 to 10.0 (Cal / em 3 ) 1 / 2 The present invention adopts the technical scheme of dispersion polymerization + good solvent dissolution, and can obtain monodisperse and functional porous polymer microspheres with only one step of polymerization and one step of post-treatment, which simplifies the preparation steps, and the prepared porous polymer microspheres have stable quality and good controllability.

The invention belongs to the technical field of anti-rust coatings, and provides an anti-rust coating composition as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing a BiVO4 composite material with high thermal stability and an oxygen vacancy structure by adopting a hydrothermal method so as to enhance the thermal stress resistance and mechanical strength of the BiVO4 composite material; secondly, a phosphonitrile chloride polymer compound is prepared through an absolute ethyl alcohol dispersion polymerization method, so that the chemical corrosion resistance and the thermal stability of the coating are improved; then, phosphate reinforced glass ceramic is prepared, and the mechanical performance and the high temperature resistance of the coating are improved; finally, the functional materials are mixed with the modified resin and the phosphate coupling agent, the mixture is evenly dispersed through a three-roller grinding machine, the anti-corrosion coating composition is prepared, the coating shows excellent thermal stress resistance under the high-temperature condition, cracking, falling and corrosion of the coating can be effectively inhibited, the service life of the high-temperature transportation pipeline is prolonged, and the anti-corrosion performance of the high-temperature transportation pipeline is improved. The method is suitable for the high-temperature pipeline field.

The invention relates to a heterogeneous catalyst, a preparation method thereof and application of the heterogeneous catalyst in preparation of diisononyl cyclohexanedicarboxylate, and belongs to the technical field of organic synthesis. The heterogeneous catalyst takes polymer microspheres as a carrier and titanate as a modification group, and the polymer microspheres are obtained by mixing a macromolecular Raft reagent, a polymeric monomer, a chain transfer agent and a solvent and then adding an oxidation-reduction system consisting of an oxidizing agent and a reducing agent for dispersion polymerization reaction. The catalyst has the advantages of multiple active sites, high catalytic activity, easiness in ester separation from a product and the like. The heterogeneous catalyst can be used for obtaining the cyclohexanedicarboxylic acid diisononyl ester at a high temperature through one-step esterification. The preparation method comprises the following steps: adding hexahydrophthalic anhydride, isononyl alcohol and a heterogeneous catalyst into a reaction kettle at normal pressure to obtain the cyclohexanedicarboxylic acid diisononyl ester.

The embodiment of the invention relates to an MOF (Metal Organic Framework) material, a preparation method thereof, acid-loaded inorganic salt sol and peroxide explosive detection application, and belongs to the technical field of fluorescence detection materials. The preparation method of the acid-loaded inorganic salt sol capable of cyclically detecting the peroxide explosive comprises the following steps: putting an MOF material and a film dispersion polymer into a solvent, so that the film dispersion polymer wraps the MOF material, and uniformly mixing to obtain gel; and adding acid into the gel, and reacting to load the acid on the gel to obtain the acid-loaded inorganic salt sol. The acid-loaded inorganic salt sol in the embodiment of the invention shows extremely high sensitivity, and the lowest detection limit can reach 10 nanograms (taking TATP as an example); in addition, the material shows excellent performance of resisting photooxidation quenching (namely resisting photobleaching) in a test environment, and can be quickly self-healed; even if the material is continuously tested for more than 500 times, the material can still keep activity and can be recycled without being damaged.

The invention provides a method for preparing micron-sized polystyrene microspheres by an improved dispersion polymerization method. The method provides three large-size microsphere preparation regulation strategies: 1) a regulator adding strategy: particle size control is realized by regulating the solubility of an initial long chain of polystyrene; 2) a dynamic solvent concentration control strategy, wherein the growth of the microspheres is influenced by adjusting the dynamic concentration of styrene in the system; and 3) an oxygen introduction strategy, wherein the final particle size is regulated by controlling the number of primary nuclei. The method has the characteristics of simple process and good repeatability, and the particle diameter of the prepared polystyrene microspheres is gt; and after multiple times of washing, precipitation and separation, the coefficient of variation (Cv) is less than 5%.

The application provides a kind of zinc oxide nanoparticles / quaternary amine modified polystyrene nanospheres and its preparation method and application.The application prepares carboxyl functionalized PS / PVP nanospheres with high monodispersity by environmentally friendly water dispersion polymerization method;ZnONPs are successfully loaded after complexing zinc ions with the surface PVP pyrrolidone ring of PS / PVP nanospheres and reducing with reducing agent, and the surface of nanospheres is modified with quaternary amine groups by amidation and further quaternary amination of the surface carboxyl groups of PS / PVP nanospheres.The preparation method is simple, and the reaction condition is easy to realize.The material obtained by the method of the application is polystyrene nanosphere surface loaded with zinc oxide nanoparticles and grafted with quaternary amine groups;it is applied to antibacterial, and zinc oxide nanoparticles and quaternary amine groups play a synergistic effect, so that the material shows high antibacterial activity and can effectively inhibit the proliferation of escherichia coli and staphylococcus aureus.

The application provides an absorption liquid for absorbing asphalt fume and oil mist waste gas, a preparation method and application, and relates to the field of waste gas treatment. The absorption liquid is prepared from the following raw materials in mass percentage: polyethylene glycol dimethyl ether 60-80%; demulsifier 5-15%; dispersion polymerization inhibitor 3-10%; oxidant carrier 1-3%; slow-release particles 2-9%; cosolvent 5-12%; and defoaming agent 0.1-1%. In the application, the anti-adhesion and polymerization resistance performance are improved through the compounding of various solvents, the continuous operation cycle of the equipment is prolonged to more than 90 days, the pressure difference of the filler is increased by less than 5%, and the frequent shutdown problem caused by asphalt fouling in the traditional technology is completely solved; meanwhile, the demulsification is efficient, the removal rate is high, and another possibility is provided for efficient, green and economic deep treatment of waste gas.

A single-component sealant or adhesive composition, including: an aqueous polymer dispersion including water and at least one water-dispersed polymer P, at least one water-dispersed or water-dissolved epoxy- or isocyanate-functional cross-linker C with a nominal epoxy- or isocyanate-functionality of at least 2, wherein the at least one water-dispersed polymer P has functional groups selected from carboxylic acid groups, amino groups, and hydroxyl groups, and wherein the epoxy- or isocyanate-functional cross-linker C has a molecular weight of at least 1000 g / mol or a number average molecular weight Mn, determined by means of GPC against polystyrene as standard, of at least 1000 g / mol, and wherein the composition includes between 0.1 and 50, preferably between 0.1 and 10 parts by weight of said epoxy- or isocyanate-functional cross-linker C per 100 parts by weight of the at least one water-dispersed polymer P.

The application belongs to the technical field of biological medicine, and particularly relates to a preparation method and application of a styrene microsphere for glycosylated hemoglobin detection. The styrene microsphere is prepared through a dispersion polymerization method, a seed polymerization method and a preparation step of organic high molecular particles. The microsphere prepared in the application has moderate particle size and concentrated distribution, good uniformity of the microsphere particle size, a hydroxyl covering on the surface of the microsphere to form a hydrophilic layer, and can effectively reduce the matrix effect, so as to achieve accurate analysis of glycosylated hemoglobin HbA1c. The result is accurate, stable and small in error in the detection, and the application can be applied to quantitative detection of diabetes.

The invention provides a crosslinked polystyrene product and a preparation method thereof, and belongs to the technical field of high polymer material molding.The preparation method comprises the steps that after raw materials are mixed and degassed, prepolymerization is conducted, the density is measured, the casting amount is calculated according to the total volume of the product, the volume fraction (55%-70%) of a center layer, the density and a shrinkage compensation coefficient, and the product is obtained. Carrying out first forming and second forming; according to the preparation method, prepolymerization and step-by-step forming are combined, polymerization heat release is effectively dispersed, and implosion, bubble and crack risks are remarkably reduced, so that the performance consistency of the product is high, a central layer and a peripheral layer are integrally combined on the molecular level through interface swelling and formation of an interpenetrating polymer network, the layering defect is avoided, and the performance uniformity of the product is improved. And through a casting amount calculation model, accurate control over materials is achieved, and the forming repeatability and the size precision are improved.

The application discloses gas-phase doped lithium iron phosphate and a preparation method thereof, and belongs to the technical field of lithium iron phosphate positive electrode materials, and comprises the following steps: S1. dispersing iron phosphate, a lithium source and a morphology control agent in water to obtain a precursor slurry, and performing spray drying on the precursor slurry to obtain a precursor powder; S2. under the protection of an inert gas, the precursor powder is subjected to three-stage sintering; the first-stage sintering is performed at 500 DEG C to 650 DEG C and is kept warm; the second-stage sintering is performed at 400 DEG C to 600 DEG C, an M source gas is introduced, and the M source is doped by gas phase; and the third-stage sintering is performed at 300 DEG C to 400 DEG C, a carbon source gas is introduced, and the carbon source is coated by gas phase. The application realizes the optimization of the single-dispersed polymer microspheres directional construction gas-phase doping morphology and the three-stage gas-phase doping-carbon coating sintering process, solves the technical problems of uneven doping and poor controllability of the morphology of the traditional lithium iron phosphate, and realizes the improvement of the electrochemical performance of the positive electrode material.

The invention provides an organic silicon microsphere preparation method and an organic silicon microsphere, which are used for solving the problem that the rigidity of a silicon dioxide microsphere in a flexible display is damaged so as to prepare the organic silicon microsphere with high elasticity and monodispersity. According to the method, dispersion polymerization and a sol-gel method are combined, a vinyl-containing organosilicon monomer, a base catalyst, a dispersing agent and an initiator are used, and the ratio of water to ethanol (the mass ratio is 4: 6-9: 1) is regulated and controlled to optimize the performance. Adding a dispersing agent and a monomer into the mixed solution, and stirring and clarifying under the protection of nitrogen; adding an initiator, stirring and dispersing; then reacting at 75-85 DEG C in a nitrogen atmosphere for more than 10 hours for polymerization; adding an alkali catalyst to adjust the pH value to 8-11, and carrying out stirring condensation at 18-40 DEG C; and finally, separating, washing and drying the microspheres. The stirring speed in the whole process is 250-400 rpm. According to the method, the elasticity and size of the microspheres can be adjusted through raw material selection and process control. The invention further provides the organic silicon microspheres prepared by the method, and the effectiveness of the organic silicon microspheres is verified by the embodiment.

The invention relates to the technical field of immunochromatography, in particular to high-dispersity magnetic nano-gold particles and a preparation method and application thereof, and the preparation method comprises the following steps: 1) preparing Fe3O4 magnetic particles by adopting a hydrothermal synthesis method; (2) preparing polystyrene magnetic particles with controllable colors and aminated surfaces by adopting a dispersion polymerization method; and (3) a citric acid reduction method is adopted, nanogold is combined with color-controllable and surface-aminated polystyrene magnetic particles through the electrostatic adsorption effect, and the magnetic gold nanoparticles are prepared. The prepared magnetic nanogold particles have the particle size range of 300-500 nm, are controllable in color, high in sensitivity, good in dispersity and good in stability, the color of the microsphere particles is regulated and controlled by introducing a colored polystyrene shell layer, the magnetic mechanical property, the optical property and the immunochromatography technology are combined, the purpose of qualitative and quantitative double detection functions of an object to be detected can be achieved, and the method is suitable for large-scale popularization and application. And the purpose of multi-color multi-connection detection can be achieved through different colors.

The invention discloses a polymer microsphere profile control and flooding agent suitable for a high-temperature low-salt oil reservoir and a preparation method and a profile control and flooding method thereof, and belongs to the technical field of oil field development and recovery efficiency improvement. The modifying and flooding agent is synthesized by adopting a multi-element dispersion polymerization method, has the particle size of 1-10 [mu] m, can resist the temperature of 150 DEG C, adapts to a stratum environment with the mineralization degree of lower than 50,000 mg / L, and keeps stable after being expanded to 2-3 times of the original particle size. The preparation method comprises the following steps: dissolving a water-soluble monomer and an initiator in water to form a water phase, dispersing the water phase in a green degradable organic solvent to form an emulsion, and reacting at the constant temperature of 80 DEG C for 4 hours. The profile control and displacement method comprises the steps that oil reservoir parameters are obtained, the concentration and the particle size of microspheres are screened, the microspheres are injected into a microsphere slug at a constant flow, the profile control and displacement process is monitored with an injection pressure rising value delta as a key index, and subsequent water drive is decided. The technical problems that an existing modifying and flooding agent is prone to excessive expansion and fracture in a high-temperature low-salt oil reservoir, and deep plugging cannot be achieved are solved, the domestic related technical blank is filled, and the crude oil recovery rate can be remarkably increased.

The invention relates to a construction binder composition comprising a raw clay matrix and a deflocculating polymer comprising monomers containing a melamine core, said deflocculating polymer having a main chain comprising melamine cores linked together by covalent bonds. The invention also relates to a construction binder and a construction material formed from this composition.

The invention discloses a preparation method of a monodisperse high-molecular polymer filler, which comprises the following steps: synthesizing seed microspheres with uniform particle size by a dispersion polymerization method, and preparing porous microspheres with required size and aperture by a two-step seed swelling method. In the preparation process, the selection, the mixing mode, the reaction temperature, the reaction time, the material proportion and the like of all the raw materials are accurately controlled, for example, the mass ratio of the dispersing agent to the vinyl monomer is (5-20)%: 1, and the like. A particle size control and pore size distribution model is also introduced to assist in controlling the product performance. The preparation method is simple in process, controllable in process and easy for industrial large-scale production. The obtained monodisperse polymer chromatographic filler has the advantages of accurately adjustable particle size and pore size, good monodispersity, good sphericity and narrow pore size distribution, can be widely applied to the fields of biochemistry, catalytic carriers, drug carriers and the like, effectively overcomes the defects of the traditional chromatographic filler, and meets the requirements of the market on high-performance chromatographic filler.

The invention discloses a cationic chromatographic filler preparation method based on RAFT (reversible addition-fragmentation chain transfer) polymerization, which comprises the following steps: synthesizing monodisperse linear polystyrene microsphere seeds by adopting a dispersion polymerization method, synthesizing polystyrene-divinyl benzene microspheres with high crosslinking degree by adopting a single-step seed swelling method, carrying out reversible addition-fragmentation chain transfer polymerization, and carrying out column packing by adopting a homogenization method. Compared with the traditional free radical polymerization, the preparation method not only retains the multifunctionality of the traditional free radical polymerization, but also solves the problem that the traditional free radical polymerization cannot well control the molecular weight and macromolecular structure, and is simple in process, convenient to operate and suitable for industrial production. The method has a potential application prospect in specific challenges of chromatographic separation and biomacromolecule separation.

A method for producing a fluoropolymer by solution polymerization or dispersion polymerization, the method including: in the presence of an initiator, a chain transfer agent, and a solvent, (i) homopolymerizing tetrafluoroethylene; or (ii) randomly copolymerizing tetrafluoroethylene and at least one of a monomer represented by the following formula (1) or a monomer represented by the following formula (2). The chain transfer agent includes at least one selected from dithioester compounds, dithiocarbamate compounds, trithiocarbonate compounds and xanthate compounds. The fluoropolymer contains 50 to 100 mol % of a polymerized unit based on the tetrafluoroethylene. The formula (1): CF2═CR1R2 wherein R1 and R2 are as defined herein, the formula (2): CH2═CR3R4 wherein R3 and R4 are as defined herein.

The present invention is directed to an aqueous dispersion, a copolymer, a redispersible polymer powder produced from the aqueous dispersion, a method for preparing waterproofing material, use of the aqueous dispersion or the redispersible polymer powder in waterproofing material, a waterproofing material comprising the aqueous dispersion or the redispersible polymer powder.

This application relates to the technical field of filler preparation, and discloses an analytical filler for separating glycated hemoglobin and a preparation method thereof. A 5-μm non-porous Polymer microsphere is synthesized by dispersion polymerization. The surface of the Polymer microsphere is hydrophilized to obtain a Polymer-based sphere. Finally, an ion exchange group is introduced onto the Polymer-based sphere to obtain an analytical filler for separating glycated hemoglobin. The hydrophilic treatment enhances the hydrophilicity of the matrix surface, reduces non-specific adsorption, and at the same time does not affect the swelling property of the filler in water or the mechanical strength. Through the preparation method of the analytical filler provided by this application, a glycated hemoglobin analytical filler with uniform particle size, good separation effect and long service life can be obtained.

Methods and dispersing agents for dispersing a polymeric low dose hydrate inhibitor are disclosed. More specifically, the method comprises contacting an aqueous fluid containing a polymeric low dose hydrate inhibitor with a dispersing agent. The dispersing agent can be selected from the group consisting of a C1-C20 alkyl sulfate, a C10-C20 alkyl ether sulfate, a C10-C20 carbonyl sarcosinate, a C10-C20 alkylbenezene sulfonate, a quaternary-ammonium based corrosion inhibitor, a glycol ether, and a combination thereof.

The present application relates to a kind of carboxyl functional time-resolved fluorescent microspheres and its preparation method, belong to fluorescent microsphere technical field.The preparation method described in the present application includes the following steps, under acidic conditions, europium salt, lanthanide salt, beta-diketone ligand, synergistic ligand and bridging ligand occur in organic solvent, obtain binuclear rare earth complex;Binuclear rare earth complex, styrene monomer, acrylic monomer, initiator, polyvinylpyrrolidone, emulsifier occur in solvent dispersion polymerization reaction, obtain the carboxyl functional time-resolved fluorescent microsphere.The preparation method described in the present application directly coats dye in the microsphere interior in polymerization stage, need not consider time-resolved fluorescent dye steric effect, can select greater, but fluorescence intensity stronger, cannot be applied to swelling method binuclear rare earth complex as time-resolved fluorescent dye, so that the fluorescence intensity of time-resolved fluorescent microsphere is higher.

The invention discloses a monodisperse polymer porous microsphere and a preparation method thereof, the preparation method comprises the following two steps: 1, seed microsphere swelling: carrying out ultrasonic emulsification swelling on an emulsifier, a pore-foaming agent, a swelling agent, monomer styrene and a cross-linking agent divinyl benzene, and reaching swelling equilibrium after a period of time; and 2, adding a stabilizer, and heating to enable styrene and divinyl benzene to generate polymerization reaction to obtain larger polymer microspheres. The particle size of the polymerized microspheres can reach 10-20 microns, the uniformity is good, the requirements of monodisperse microspheres can be met, and the experimental method is easy and convenient to operate, good in process stability and reproducibility and very suitable for industrial production.

The invention discloses a preparation method of a high-capacity cation chromatographic stationary phase, which comprises the following steps: preparing non-crosslinked PS (polystyrene) seed microspheres by dispersion polymerization, dispersing the non-crosslinked PS seed microspheres in water under the action of a proper emulsifier to form a seed microsphere emulsion, swelling the seed microspheres at room temperature by a proper reagent to obtain the high-capacity cation chromatographic stationary phase. Then adding a mixed system of anhydride monomers, an initiator and a pore-foaming agent, continuing swelling for a certain time, and then heating to initiate the monomers to have a polymerization reaction; and after the reaction is finished, cleaning to remove the pore-foaming agent in the product microspheres, and finally, putting the cleaned polymer microspheres into hot water and stirring to promote hydrolysis of anhydride in pores, thereby obtaining the porous polymer microspheres with complete crosslinking function.

Provided herein are bottlebrush polymers and macromolecules including such polymers, comprising: a monodisperse polymer backbone; and defined bottlebrush sidechains. The polymer backbone is a polypeptide comprising amino acid residues with an amine moiety on the sidechain of each amino acid residue. Each of the defined bottlebrush sidechains is attached to the polymer backbone at the amine moiety of each of the respective amino acid residues; and the defined bottlebrush sidechains comprise at least two blocks of polypeptide or similar, wherein, in each said block, the polypeptide, polypeptoid or polypept(o)ide is functionalised proximate to the end of its chain with a reactive group or ligand, wherein adjacent blocks of the at least two blocks do not comprise the same reactive group or ligand. Also provided are methods of making such bottlebrush polymers, as well as methods of forming bottlebrush polymers with a longer or branched backbone, macromolecules comprising such bottlebrush polymers made by such methods, and uses thereof.