62 results about "Dispersion polymerization" patented technology

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 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.

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 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 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 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.

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.

The invention relates to preparation of carboxyl-functionalized superparamagnetic composite microspheres and application of the carboxyl-functionalized superparamagnetic composite microspheres in chemiluminescence immunodetection, the surfaces of the carboxyl-functionalized superparamagnetic composite microspheres are chemically modified with carboxyl functional groups, the carboxyl-functionalized superparamagnetic composite microspheres are coupled with an antibody to obtain immunomagnetic spheres, and the average particle size of the immunomagnetic spheres is 1.3-1.4 microns. The preparation method comprises the following steps: by taking glycidyl methacrylate as a monomer, preparing polyglycidyl methacrylate microspheres by adopting a dispersion polymerization method; after sulfonic acid groups are introduced to the surfaces of the microspheres, magnetic Fe3O4 nanoparticles are loaded through an in-situ precipitation method; coating the magnetic microspheres with silica gel; finally, a carboxyl functional group is introduced through surface polymerization. The microspheres are uniform in particle size, high in magnetic responsiveness, good in dispersion effect and high in stability. The microsphere can be used as a solid phase carrier in chemiluminescence immunoassay, realizes high-sensitivity and high-specificity chemiluminescence detection of a target object through EDC / NHS activation and antibody covalent coupling, can meet clinical use requirements, and has a wide application prospect in the field of biomedical detection.

The invention relates to the use of an organic additive during the grinding of at least one raw clay matrix, characterized in that the organic additive comprises a deflocculating polymer having a molecular mass of at least 1000 g / mol and at least 3 negatively charged groups at a pH greater than 7. The invention also relates to a raw clay matrix ground according to the invention and a construction binder using such clay.

This invention belongs to the field of emulsion polymerization technology, specifically relating to a method for preparing coagulation-dispersion controllable emulsions based on acrylic macromolecular emulsifiers. The method utilizes acrylic macromolecular emulsifiers in a free radical emulsion polymerization process, covalently binding hydrophilic acrylic acid segments to the surface of latex particles. The coagulation and dispersion states of the emulsion prepared by this method are easily controlled by the pH value of the emulsion system. The control process is reversible and rapid. After a coagulation-dispersion cycle, the particle size and particle size distribution of the latex particles are essentially consistent with the initial emulsion. This method can significantly shorten the preparation cycle of high-solids-content emulsion polymerization, providing an effective approach for expanding the preparation and application of water-dispersible polymers.

The invention discloses a preparation method of a long-acting anti-corrosion coating based on nano-composite particles, and relates to the technical field of metal anti-corrosion coatings. The method comprises the steps of dispersion of nano particles, preparation of a polymer matrix, preparation of a nano composite coating and coating and curing. Nanoparticles are uniformly dispersed in a polymer matrix through an efficient dispersion technology to form a nano composite coating with stable performance. The coating is applied to the surface of a metal base material in a spraying, brushing or dip-coating mode, a compact anti-corrosion barrier is formed after curing, and the coating has excellent corrosion resistance, adhesive force and long-acting protection performance.

The application provides a double-tail type hydrophobic monomer and a preparation method thereof, a polysaccharide modified polyacrylamide emulsion and a fracturing fluid, the double-tail type hydrophobic monomer has the following structure: wherein R1 is selected from a C6-C18 saturated alkyl group, a C6-C18 aryl group, a C6-C18 alkyl aryl group, a C6-C18 alkyl acid group, a C6-C18 alkyl alcohol group, a C6-C18 alkyl ester group or a C6-C18 alkyl benzene sulfonic acid group; and X is selected from chlorine, bromine or iodine. The double-tail type hydrophobic monomer, a water-soluble monomer and a functional monomer N,N'-methylene bisacrylamide are copolymerized by using a dispersion polymerization method, reversible physical cross-linking is formed through the association of hydrophobic groups, a huge molecular space network structure is formed, and the polymer solution has high viscosity, good temperature resistance, salt resistance and shear resistance at a low concentration.

This utility model discloses a solvent removal device for glycidyl ester type epoxy resin, relating to the field of epoxy resin processing technology. It includes a solvent removal vessel, a heating layer, and a solvent removal stirring assembly. The heating layer is located inside the solvent removal vessel, and an inner vessel body is located inside the heating layer. The solvent removal stirring assembly is installed inside the inner vessel body and includes a rotating shaft, connecting rods, a secondary motor, a stirring shaft, a spiral blade, and stirring vanes. Four connecting rods are fixed to the outer side of the rotating shaft. This solvent removal device for glycidyl ester type epoxy resin allows the rotating shaft to drive the connecting rods and the secondary motor to revolve, while the four secondary motors and the stirring shaft drive the spiral blades to rotate. This causes the solvent, along with equidistantly distributed, serrated turbulence rings on the inner wall of the inner vessel, to cut the solvent, forming a dynamic mixing field of extrusion, dispersion, and polymerization, improving mass transfer efficiency, increasing the gas-liquid contact area, and thus improving the solvent removal effect.

The present invention relates to a process for producing dispersible polymer particles comprising a releasable agent, the process comprising: (i) providing a polymer particle forming stock liquid comprising one or both of polymer in solution, polymer in a colloidal state, and (ii) combining with the polymer particle forming stock liquid an ionic nucleant that promotes precipitation of the polymer; wherein as the polymer precipitates it coats the releasable agent to form the dispersible polymer particles comprising the releasable agent.

Porous metal oxide microspheres are prepared by a method comprising forming a liquid solution or dispersion of polydisperse polymer nanoparticles and metal oxide; forming liquid microdroplets from the solution or dispersion; drying the liquid microdroplets to provide polymer template microspheres comprising polymer nanospheres and metal oxide; and removing the polymer nanospheres from the template microspheres to provide porous metal oxide microspheres. The porous microspheres exhibit saturated colors and are suitable as colorants for various end uses.