92 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 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 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.

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 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 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 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.

The invention discloses a preparation method of crosslinked polystyrene porous microspheres with controllable surface aperture and particle size, which comprises the following steps: dispersing monodisperse polystyrene microspheres with different particle sizes and molecular weights prepared by emulsion polymerization, soap-free emulsion polymerization or dispersion polymerization in a lauryl sodium sulfate aqueous solution; and activating the seed microspheres by using a micromolecular swelling agent, then adding a monomer dissolved with an initiator and a cross-linking agent for second-step swelling, and after swelling is finished, carrying out heating polymerization reaction to prepare the cross-linked polystyrene porous microspheres. According to the preparation method, nano-scale PS seed balls with different molecular weights are prepared firstly, and then the cross-linked PS porous microspheres prepared through swelling polymerization are smaller in particle size (lt; 2m), so that the particle size distribution range of the cross-linked PS porous microspheres is remarkably reduced. The prepared porous microspheres are small and adjustable in particle size (800 nm <-2 > m), controllable in pore diameter and good in suspension property, can be kept not to settle for a long time, and have more advantages in practical application of chromatographic packing, carrier catalysis, targeted drugs, cell separation, immunoassay and the like.

Provided is a pressure-sensitive adhesive sheet that can be suppressed from being increased in peel strength even when an aqueous pressure-sensitive adhesive composition is used. The pressure-sensitive adhesive sheet includes: a base material; and a pressure-sensitive adhesive layer formed of a water-dispersed pressure-sensitive adhesive composition containing a water-dispersed polymer. A surface concentration of a carboxyl group in a surface of the pressure-sensitive adhesive layer obtained by an X-ray photoelectron spectroscopy (ESCA) gas-phase chemical modification method is equal to or less than a detection limit.

The application discloses a preparation method of a reinforced silicon-based negative electrode, which comprises the following steps: porous nano-silicon core preparation, MAH-g-PEO preparation, BCNT modification and dispersion, polymer coating, SEI reinforced film deposition, and negative electrode preparation. The PEO is modified and grafted, the silicon particles are coated, the ester bond is generated by combining the hydroxyl on the silicon surface, the interface bonding energy of the coating layer and the silicon surface is greatly improved, the coating layer is not easy to fall off while inhibiting the expansion of the silicon negative electrode, the SEI reinforced film containing LiF is formed by in-situ deposition, the strong stability of LiF greatly increases the strength of the SEI film, the damage rate of the SEI film is greatly reduced, and the CNT can form hydrogen bonds with the polymer after being modified by KH560, and the CNT experiences a more firm and reliable conductive network, so that the conductive performance is further improved.

The spraying repair mortar for repairing the acid-corrosion-resistant structures comprises the following components in parts by mass: 100 parts of a cementing material which comprises sulphoaluminate cement, silica fume and biomass charcoal powder; 85-160 parts of aggregate comprising tailing sand, and the tailing sand comprises three particle size segments; 0.1 to 1.0 part of reinforcing fiber; the chemical additive is prepared from the following components in parts by weight: 0.5 to 5.0 parts of redispersible polymer powder, 0.05 to 0.5 part of cellulose ether water retention and thickening component, 0.02 to 0.5 part of retarder, 0.1 to 1.5 parts of polycarboxylic acid type water reducing agent and 0.02 to 0.3 part of defoaming agent on the basis of 100 parts of the cementing material; and mixing water, wherein the mass ratio of the mixing water to the cementing material is 0.30-0.50. The invention further provides a preparation method of the spraying repair mortar for repairing the acid-corrosion-resistant structures. Early strength and bonding are both considered, and functions of the biomass charcoal are synergistic.

The invention provides a hemispherical lens array and a preparation method and application thereof. The preparation method comprises the following steps: taking monodisperse polymer microspheres as a template, obtaining a single-layer microsphere array through a colloid friction self-assembly method, and integrally transferring the single-layer microsphere array to a transparent adhesive tape adhesive layer to form a semi-embedded structure; then, a high-precision hemispherical concave cavity array imprinting template is obtained by adopting a polydimethylsiloxane reverse mold method; an ultraviolet curing polymer prepolymer or a high-refractive-index inorganic nanoparticle solid fluid is respectively imprinted on the surface of a sample to be detected by using the template, and a hemispherical lens array is prepared. The obtained lens array can capture and convert near-field high-frequency information on the surface of a sample, large-view-field super-resolution optical microscopic imaging is achieved, and the imaging resolution of the polymer lens array and the imaging resolution of the inorganic lens array are superior to 100 nm and 50 nm respectively. The template used in the invention has an accurate structure, can be repeatedly used, and is suitable for large-area fine observation of nano materials, semiconductor chips and other micro-nano structures.

The invention provides a preparation method of a monodisperse polymer / metal composite microsphere, which comprises the following steps: A) under an ice bath condition, reacting a multi-sulfydryl monomer with other monomers in a liquid-phase medium to obtain a microsphere with sulfydryl on the surface; and B) placing the microspheres containing sulfydryl on the surfaces in a chemical plating solution, and reacting to obtain the polymer / metal composite microspheres. The polymer / metal composite microsphere provided by the invention is simple in preparation process and low in energy consumption. According to the preparation method, the low-temperature condition is adopted, the nucleation time is delayed, the monodispersity of the microspheres is improved, the compactness of the metal conducting layer is improved in a click chemistry mode, and then the conductivity of the monodisperse polymer / metal composite microspheres is improved.

The invention discloses a polymer precursor ceramic inverse opal structure and a preparation method and application thereof in the field of aerospace thermal protection materials. Polystyrene microspheres are synthesized through a dispersion polymerization method, and a stacked opal template is prepared through self-assembly; dipping a liquid mixture containing a polymer precursor and a photoinitiator or a thermosetting agent into the template, and curing by adopting an ultraviolet curing or high-pressure thermocuring method to obtain a polymer precursor / template complex; and finally, performing high-temperature pyrolysis in an inert atmosphere to convert the polymer precursor into polymer precursor ceramic, and removing the template, thereby obtaining the three-dimensional inverse opal photonic crystal structure material with the regular periodic aperture. Through the design of the inverse opal structure of the polymer precursor ceramic, the reflectivity of the polymer precursor ceramic from visible light to near-infrared band is effectively improved, the thermal protection threshold is effectively improved, and the thermal protection material is multifunctional through the temperature resistance characteristic of the polymer precursor ceramic.

An anode electrode is provided. The anode electrode comprises an anode current collector and an anode active material layer arranged on the anode current collector. The anode active material layer includes an electrochemically active material, a dispersing polymer binder, an adhesive polymer binder, and a conductive filler. The electrochemically active material includes graphite. The dispersing polymer binder exhibits amphiphilic properties, comprising a hydrophobic domain and a hydrophilic domain, which stabilizes hydrophobic carbon particles in water. The adhesive polymer binder has a glass transition temperature that provides flexibility, durability, and cohesive strength between the carbon particles.The conductive filler comprises a conductive carbon that reduces the pore channel and charge transfer resistance at the interface between the binder and the active material.

The invention discloses a preparation method of a cross-linked polymethyl methacrylate (PMMA) microsphere. Belongs to the field of functional polymer materials. The preparation method comprises the following steps: S1, by taking a hydrocarbon / ether mixture as a solvent through a conventional dispersion polymerization method, introducing a functional monomer hydroxyethyl methylacrylate and methyl methacrylate free radical copolymerization to form a linear PMMA (Polymethyl Methacrylate) microsphere precursor with hydroxyl; s2, after polymerization is completed, diisocyanate is added for a cross-linking reaction. The prepared cross-linked PMMA microspheres can be used in the fields of coatings, optics, medicine and the like. According to the invention, a strategy of step-by-step implementation of'polymerization-crosslinking 'is innovatively adopted, so that the interference of crosslinking reaction on the spheroidizing property and initial morphology of the microspheres is fundamentally avoided, and a new feasible way is opened up for preparing microsphere products with high crosslinking degree.

The invention provides a resin emulsion building material, relates to the technical field of building materials, aims to solve the problem of poor comprehensive performance of existing building materials, and adopts the technical scheme that the resin emulsion building material comprises a resin emulsion and a primer, the resin emulsion is prepared from emulsion, a silicon solution, wollastonite, alcohol ester dodecyl carbonate, ethylene glycol, a thickening agent, purified water, a mildew preventive, a defoaming agent, a suspending agent and water; the primer is prepared from alkali-resistant emulsion, a silicon solution, wollastonite, alcohol ester dodecyl carbonate, ethylene glycol, a thickening agent, purified water, a mildew preventive, a defoaming agent, natural sand excavation, a sterilizing agent and a dispersing agent. After the polymeric material is dispersed, the paint has the comprehensive properties of tear resistance, alkali resistance, water resistance, high temperature resistance, temperature change resistance and the like, the situations of cracking, shelling and the like cannot occur even after long-time acid rain, solar ultraviolet irradiation or alkaline substance corrosion, a wall body is protected, and meanwhile, the service life of a coated building surface is prolonged.

This invention provides a novel synthesis method for producing spherical monodisperse polymer beads that have adjustable diameter, good rigidity and good resistance to organic solvents, and contain sufficient hydrophilic functional groups to promote the uploading of a high percentage of superparamagnetic Fe3O4NP, enabling the production of new monodisperse superparamagnetic polymer beads in the 1-5 μm diameter range for IVD applications. [Solution] A monodisperse superparamagnetic bead having a core-shell structure. The bead includes: a core portion formed from a polystyrene polymer matrix material encapsulating a first batch of superparamagnetic Fe3O4 nanoparticles; a first shell portion directly located on the top of the core portion and formed from a crosslinked polymer matrix material composed of a styrene monomer, a crosslinkable monomer, and a first functional monomer having a functional group; and a second shell portion directly located on the top of the first shell portion.

The application provides a monodisperse functionalized polymer magnetic composite microsphere and belongs to the technical field of magnetic materials. The monodisperse polystyrene microsphere is prepared by using a dispersion polymerization method, a two-step swelling method is used to obtain porous crosslinked polystyrene microspheres, then the porous crosslinked polystyrene microspheres are mixed with sulfuric acid to obtain porous polystyrene microspheres containing sulfonic acid groups on the surface, then the in-situ precipitation method is used to combine with ferrous ions, in an alkaline environment, the magnetic porous polystyrene microspheres are obtained, finally in acetonitrile solvent, various functional monomers are added to obtain the monodisperse functionalized magnetic composite microspheres which have good suspension performance and fast magnetic attraction rate.

Method of coating a substrate comprising the steps of: i) applying to the substrate a radiation curable aqueous composition comprising a dispersed polymeric binder, ii) thermally drying the aqueous coating composition and iii) electron beam curing the coating composition, the method being characterized by the fact that the aqueous coating composition is a physically drying, film-forming aqueous composition and that the curing is performed in air atmosphere.