198 results about "Suspension polymerization" patented technology

The invention provides a phenolic resin-based spherical silicon-carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium battery materials. The preparation method comprises the following steps: preparing spherical phenolic resin by adopting a suspension polymerization method, curing to obtain phenolic resin microspheres, preparing porous carbon spheres by taking the phenolic resin microspheres as a carbon precursor in a carbonization and alkali activation manner, carrying out CVD vapor deposition on nano silicon, and carrying out carbon coating to obtain the phenolic resin-based spherical silicon-carbon composite material. The phenolic resin is utilized to form a highly cross-linked network structure after curing, the carbon spheres obtained after carbonization have good mechanical strength and rigidity, the porous structure of the porous carbon spheres provides a volume change buffering structure for nano-silicon, the lithium ion path is shortened, the spherical structure is beneficial to uniform dispersion, nano-silicon particles are prevented from gathering, and the performance of the lithium ion battery is improved. And the porous carbon spheres with high specific surface area can also improve the interface reaction activity, so that the problems of high volume expansion, low conductivity and slow ion diffusivity of silicon are solved.

The invention provides an adsorbent capable of simultaneously adsorbing bilirubin and cytokines and a preparation method and application thereof, and the preparation method comprises the following steps: carrying out suspension polymerization reaction on a styrene monomer and a polyvinyl cross-linking agent in a dispersion medium under the action of a continuous multi-component pore-foaming agent and an initiator to prepare polystyrene-based macroporous resin; carrying out chloromethylation reaction on the polystyrene-based macroporous resin to prepare chlorine balls; carrying out post-crosslinking reaction on the chloromethylated beads to prepare the adsorbent capable of adsorbing bilirubin and cytokines at the same time; the continuous multi-component pore-foaming agent comprises a first pore-foaming agent, a second pore-foaming agent and a third pore-foaming agent of which the solubility parameters are gradually increased in sequence; the temperature of the suspension polymerization reaction is adjusted according to the mass fraction of the polyvinyl cross-linking agent in the monomer mixture and the solubility parameter of the continuous multi-component pore-foaming agent, and the monomer mixture is composed of styrene monomers and the polyvinyl cross-linking agent. The bilirubin and cell factors can be adsorbed at the same time, and the safety of blood purification is improved.

The invention relates to polystyrene cation exchange resin as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a dispersing agent in a solvent to obtain a dispersed phase for suspension polymerization reaction, uniformly mixing a reaction monomer, a cross-linking agent, a pore-foaming agent and an initiator, and carrying out suspension polymerization reaction under segmented stirring and segmented temperature change to prepare copolymer microspheres; and putting the dried microspheres into a reaction kettle, swelling, carrying out sulfonation reaction through a variable temperature program on the basis to obtain sulfonated microspheres, and carrying out alkali exchange reaction on the sulfonated microspheres to obtain the final product cation exchange resin. Compared with the prior art, the cation exchange resin preparation method provided by the invention has the characteristics of simple and feasible process, easiness in large-scale production, low cost, high specific surface area, high adsorption capacity and high separation efficiency, and is especially suitable for separating and purifying substances containing amino groups or aminoglycosidic bonds.

The invention belongs to the technical field of foam materials, and particularly relates to a wave-absorbing functional foamable PMI precursor bead, a preparation method thereof and a wave-absorbing functional PMI foam material. According to the technical scheme, the method comprises the following steps: 1) adding deionized water, inorganic salt and a dispersing agent into a reaction container, mechanically stirring uniformly, and heating to a polymerization temperature to obtain a suspension polymerization water phase; 2) uniformly mixing a monomer, an initiator, a foaming agent and a cross-linking agent at room temperature, adding the mixture into the suspension polymerization water phase, and performing suspension polymerization under a stirring condition to obtain foamable PMI precursor beads; and 3) washing the PMI precursor beads with water for multiple times, and drying to obtain the wave-absorbing functional foamable PMI precursor beads. And placing the wave-absorbing functional foamable PMI precursor beads in a mold, and carrying out high-temperature heat treatment foaming to obtain the wave-absorbing functional PMI foam material. The intrinsic performance of the base material is not damaged, the magnetic particles are uniformly dispersed in the base material, and the wave absorbing effect is good.

The application discloses large-diameter core-shell polymer particles, a preparation method and application thereof. The large-diameter core-shell polymer particles have a particle size of 1-50 microns; the structure of the particles comprises a water-insoluble soft substance layer and a hard substance layer, and the weight ratio of the soft substance layer to the hard substance layer is 1:0.1-10, and the hard substance layer is located at the outer layer of the soft substance layer. The particles are prepared by using a modified aqueous suspension polymerization and / or emulsion polymerization method. The obtained particles can improve the hardness of an electric core, inhibit the deformation of the electric core, and do not affect the air permeability. Compared with general micron-level homogeneous polymer particles, the particles provided by the application have a soft core and hard shell structure, which is also beneficial to improving the performance of a diaphragm. The hard substance layer located at the outer layer of the particles ensures that the diaphragm coating is not sticky after drying, so that the diaphragms are not adhered to each other after being wound. The soft substance layer located at the inner layer of the particles can provide strong adhesion, so that the diaphragm and the pole piece have higher peeling strength.

Expandable styrene polymers comprising polymeric brominated flame-retardant, wherein the polymeric brominated flame-retardant comprises at least one brominated polybutadiene block having a bromination degree between 33 and 75%, based on the double bonds in the polybutadiene block before bromination, a process for producing such expandable styrene polymers by suspension polymerization and particulate foam moldings made therefrom.

The application discloses a polypropylene-based energy storage dielectric material and a preparation method and application thereof. The preparation method comprises the following steps: after a polypropylene substrate and a (meth) acrylic acid fluorine-containing ester monomer are pre-swollen in a solvent, polymerization reaction is carried out through an initiator, and post-treatment is carried out on a grafted polymer to obtain a (meth) acrylic acid fluorine-containing ester functionalized polypropylene. The application adopts a suspension polymerization method, introduces a fluorine-containing group into a polypropylene structure to induce electron cloud distribution, promotes crystalline domain aggregation to improve crystallinity, adjusts dielectric constant, loss factor, leakage current and breakdown electric field of a polymer material, so that energy storage density and efficiency of a polymer dielectric are controlled.

A process for preparing an ethylene polymer in a suspension polymerization including the steps of separating the formed suspension of ethylene polymer particles in a solid-liquid separator into ethylene polymer particles and mother liquor, transferring a first part of the mother liquor into a work-up section including an evaporation unit for producing a wax-depleted portion of the mother liquor, wherein a protic agent is added to the part of the mother liquor which is transferred into the work-up section, and recycling a first part of the wax-depleted portion of the mother liquor to the polymerization reactor or the series of polymerization reactors.

The invention discloses an irradiation cross-linked biodegradable composite plastic straw and a preparation method thereof. The irradiation cross-linked biodegradable composite plastic straw is prepared from the following raw materials in percentage by mass: 40-80% of polylactic acid, 15-45% of nano inorganic filler, 0.4-1% of chain extender, 1-3% of flexibilizer, 1-3% of lubricant, 0.3-1% of nucleating agent, 0.3-1% of coupling agent, 1-10% of cross-linking agent and 0.3-1% of compatilizer. The chain extender is an epoxy group chain extender copolymer which contains 6-9 epoxy functional groups and is formed by copolymerizing glycidyl methacrylate, styrene and acrylic acid low-carbon alcohol ester through a solution polymerization or suspension polymerization process. The heat resistance of the polylactic acid composite plastic can be improved through irradiation processing, the polylactic acid composite plastic straw has higher heat resistance and does not deform in a high-temperature use environment, and pathogenic bacteria and viruses in a product are killed in the irradiation crosslinking process at the same time.

The application provides a preparation method of a rare earth metal adsorption and separation resin and a resin extraction column. The preparation method comprises the following steps: adding an oil phase composed of styrene, divinylbenzene, a pore former and an initiator into an aqueous phase containing a dispersant and an inorganic salt to perform suspension polymerization, so as to obtain a white ball resin; performing phthalimide and hydrolysis on the white ball resin, so as to obtain a primary amine resin; performing reaction on the primary amine resin with chloroacetic acid and an alkaline medium, so as to perform carboxymethylation on part of the primary amine sites; and performing reaction on the obtained intermediate resin with phosphorous acid, formaldehyde and an acidic medium, so as to perform phosphonic acid methylation on the remaining part of the primary amine sites. The white ball resin is first subjected to amination, and then part of the carboxymethylation and part of the phosphonic acid methylation are sequentially performed, so that the carboxyl type chelation sites and the phosphonic acid type chelation sites are simultaneously reserved in the same resin bead, thereby being beneficial to improving the comprehensive adsorption performance and separation performance of the resin on the rare earth metal.

The invention provides spherical lignin-phenolic resin, a preparation method thereof and application of the spherical lignin-phenolic resin in adsorption of N-containing organic dye, and belongs to the technical field of adsorption materials. The lignin-phenolic resin with the regular spherical morphology can be prepared through a one-step condensation polymerization reaction by taking lignin, hydroquinone and trioxymethylene as raw materials under an acidic catalysis condition and adopting a reversed-phase suspension polymerization method, the lignin belongs to a renewable resource and has the characteristics of low cost and environmental friendliness, and the lignin-phenolic resin can be used for preparing the lignin-phenolic resin with the regular spherical morphology. The phenolic resin can replace phenols to become a main phenol source, the substitution rate can reach 75%, and the yield of the synthesized phenolic resin reaches up to 60-80%. Besides, abundant phenolic hydroxyl groups, sulfonic acid groups and other oxygen-containing groups can be introduced into the resin by selecting the types of monomers, the cross-linked structure of the resin is changed by regulating and controlling the proportion of the monomers, the adsorption capacity of N-containing organic dyes is effectively improved, and efficient adsorption of rhodamine B and methylene blue can be achieved.

This utility model discloses a polyvinyl chloride suspension polymerization reactor, relating to the field of polymerization reactor technology. It includes an outer reactor body with a connecting frame on its annular side. A right-angle gear is rotatably connected inside the connecting frame, and a connecting block is fixedly connected to the lower surface of the connecting frame. An inner reactor body is rotatably connected inside the outer reactor body. During the stirring process, the output shaft of a servo motor drives the fixed right-angle gear to rotate. The rotation of the right-angle gear causes the inner reactor body, which is engaged with it, to rotate as well. The inner reactor body is rotatably mounted inside the outer reactor body via two fixed connecting rings. At this time, the rotation direction of the inner reactor body is opposite to that of the stirring rod. This interaction allows the materials to be subjected to forces in different directions, resulting in more thorough mixing and effectively improving the polymerization reaction effect.

The invention discloses an adsorbent resin and a preparation method thereof, and belongs to the technical field of wastewater adsorption treatment. The preparation method comprises the following process steps: S1, taking p-chloromethyl styrene, styrene and n, n '-(4, 4'-methylene diphenyl) bismaleimide as monomers, mixing the monomers, a cross-linking agent and a pore-foaming agent to obtain an oil phase, and carrying out suspension polymerization in the presence of a dispersion phase, an additive and an initiator to obtain a polymerization product; s2, carrying out Soxhlet extraction and other treatments on the polymerization product to obtain chloromethylated amide group modified polystyrene; s3, carrying out amination treatment on the chloromethylated amido group modified polystyrene to obtain an amination product; and S4, washing and vacuum drying the amination product obtained in the step S3 to obtain the adsorption resin. The adsorbent resin obtained by the method can effectively enrich long-chain alkyl carboxylic acid in a water body, and has the advantages of low cost, high adsorption capacity, strong selectivity and excellent cyclic regeneration stability.

The invention provides a micro-capsule suspending agent containing fluopyram as well as a preparation method and application of the micro-capsule suspending agent, and belongs to the technical field of pesticide preparations. The micro-capsule suspending agent containing fluopyram is obtained by adopting a suspension polymerization method, and the obtained micro-capsule suspending agent is high in encapsulation efficiency and excellent in dispersity, has good ultraviolet stability and heat storage stability, and has a good prevention and removal effect and a long lasting period when being used for preventing and treating root nematodes. After root-irrigation pesticide application, the micro-capsule suspending agent containing fluopyram provided by the invention can be slowly released in soil and roots, has a good prevention effect on tomato and cucumber root-knot nematode, and has the advantages of long lasting period, multiple prevention and control crops, wide bactericidal spectrum and excellent uptake conductivity.

The application discloses a polymer microsphere containing a surfactant unit. The polymer microsphere is prepared by a suspension polymerization method, and the polymer microsphere comprises the following units: A, an oil phase unit; B, a reactive surfactant unit; and C, an initiator unit. The application replaces a conventional surfactant with a reactive surfactant, and the amount of the reactive surfactant is smaller than that of a non-reactive surfactant. In addition, a suitable type of the reactive surfactant makes the microsphere dispersion more stable in the polymerization process, so that the polymer microsphere has a more concentrated particle size distribution, a smooth surface and excellent heat resistance. Meanwhile, the polymer microsphere disclosed by the application does not contain silica or residual suspending agent, and does not affect the application field of the polymer microsphere, so that the polymer microsphere has a greater application prospect in technical fields such as electronics, optoelectronics, optics, medicine and building.

This invention relates to a suspension polymerization method for polymerizing alkoxyamines with styrene and (meth)acrylic acid monomers, to beads and compositions thus obtained, and to uses of such beads and compositions.

The invention discloses a preparation method of through hole type resin, and belongs to the technical field of polymer resin materials. A ternary composite pore-foaming agent composed of toluene, n-heptane and polyethylene glycol (PEG) is adopted, the proportion of the ternary composite pore-foaming agent is optimized, and the through type resin is prepared through suspension polymerization and temperature programming curing. The resin prepared by the method has a highly through pore channel network, the penetration rate is not less than 50%, the resin also has appropriate large pore diameter and relatively high specific surface area and pore volume, meanwhile, the resin keeps good mechanical stability while obtaining an excellent penetration structure, the preparation process is good in repeatability, and the preparation method is suitable for industrial production. An ideal material is provided for the fields of high-performance adsorption separation, chromatographic analysis, catalysis and the like.

Provided are methods for efficiently producing porous particles and a carrier for purification or adsorption which have excellent antifouling properties or excellent carbon dioxide adsorption properties.　A method for producing porous particles includes steps (i) to (iii) mentioned below, wherein the water-based medium in step (iii) is a water-based medium such that the amount of a salt dissolved per unit mass is 10 parts by mass or more when the mass of the salt per unit mass in a saturated solution reached by dissolving the salt in the water-based medium under conditions of 23°C and 1 atm is 100.　(i) A step for preparing a hydrocolloid in a salt-containing water-based medium; (ii) a step for dispersing a liquid composition in a hydrocolloid-containing water-based medium prepared in step (i), the liquid composition containing a hydrophobe having a solubility in water at 25°C of 1.0×10-4g / L or less and one or more monomers that are different from the hydrophobe; and (iii) a step for subjecting the monomers dispersed in step (ii) to suspension polymerization in a water-based medium containing a hydrocolloid and a salt.

The invention discloses a preparation method of in-situ large-size high-density semiconductor-grade high-purity silicon carbide multi-crystal grains, and relates to a preparation method of a high-purity semiconductor-grade silicon carbide polycrystal material. The method aims at solving the technical problems that silicon carbide polycrystalline particles prepared by an existing method are small, secondary crystallization is needed, energy consumption is high, and the yield is low. The method comprises the following steps: preparing precursor resin as a nucleation seed crystal and an adhesive by adopting a non-catalytic suspension polymerization method; 2, preparing a silicon-carbon pre-sintered body; and 3, preparing the in-situ large-size high-purity semiconductor-grade silicon carbide polycrystalline material through a curing process, a self-propagating synergistic carbon thermal reduction reaction process, an in-situ silicon carbide grain growth process and an in-situ silicon carbide grain densification process. The particle size of the prepared silicon carbide multi-crystal grains is 0.8-20mm, the purity reaches 6N, the density reaches 1.6-2.5 g / cm < 3 >, the yield is 85-90%, and the silicon carbide multi-crystal grains can be used in the field of silicon carbide preparation.

The present invention provides a method for producing a fluoropolymer, characterized in that the method comprises a step of producing a fluoropolymer by polymerizing a fluoromonomer containing tetrafluoroethylene, in a solution containing perfluorodiacyl peroxide and a fluorosolvent, by continuously adding the tetrafluoroethylene into a reaction vessel; the polymerization is suspension polymerization; the perfluorodiacyl peroxide is represented by the following formula (1); the fluorosolvent is at least one selected from the group consisting of perfluorocarbons, hydrofluorocarbons, and fluorine-containing ethers; the content of the perfluorodiacyl peroxide in the solution is 5 to 30 mass% relative to the total liquid; and the fluoropolymer has a polymerization unit based on tetrafluoroethylene.(C5F 11 COO)2(1), wherein the C5F 11 group is linear.

The invention relates to a method for producing water-absorbing polymer particles by suspension polymerization and thermal surface post-curing. The agglomerated base polymer obtained by suspension polymerization has a centrifuge retention capacity of at least 37 g / g and the thermal surface post-curing is carried out at between 100 -190°C.

The invention provides a preparation method and application of anion exchange resin. The invention relates to a preparation method of anion exchange resin, which comprises the following steps: carrying out surface modification on nano zirconium dioxide by using a silane coupling agent to obtain hydrophobically modified zirconium dioxide; adding modified zirconium dioxide and an initiator into the comonomer, and synthesizing a zirconium dioxide-containing resin matrix through a suspension polymerization method; and carrying out amination reaction on the resin matrix to obtain the strongly basic anion exchange resin containing zirconium dioxide. And the silane coupling agent is vinyl trimethoxy silane. According to the preparation method disclosed by the invention, nano zirconium dioxide is uniformly dispersed in the resin through surface modification treatment, so that the thermal stability and the mechanical strength of the resin are effectively enhanced. According to the preparation method, a suspension polymerization method and a subsequent amination process are combined, and the preparation method is mature in process, high in controllability and suitable for industrial production.

The invention relates to the technical field of high polymer material processing, in particular to a high-strength heat-resistant PVC (polyvinyl chloride) production process based on nano reinforcement and cross-linking modification. The method comprises a calcium carbide method raw material pretreatment step, a vinyl chloride synthesis and refining step, a nanometer material dispersion liquid preparation step, a suspension polymerization reaction step and a product post-treatment separation step. According to the high-strength heat-resistant PVC production process based on nano reinforcement and cross-linking modification, surface modification and ultrasonic dispersion treatment are performed on the nano functional filler before suspension polymerization reaction, so that the agglomeration phenomenon of the nano material is effectively inhibited, and the interface chemical bonding between the nano material and a polyvinyl chloride matrix is enhanced; the method has the advantage of remarkably improving the mechanical strength and thermal stability of the PVC resin.

The present invention relates to hydrogel hyaluronic acid (HA) microspheres or pharmaceutically acceptable salts thereof prepared via suspension polymerization. The hydrogel HA microspheres prepared according to the method of the invention can be used as carriers for various substances, such as carriers for various drug parts. The invention also provides a drug conjugate using the hydrogel HA microsphere as a carrier or a pharmaceutically acceptable salt thereof, a method for preparing the drug conjugate, a drug composition containing the drug conjugate, and applications of the drug conjugate and the pharmaceutically acceptable salt.

The invention relates to the technical field of inorganic mesoporous materials, in particular to an amplification preparation system of millimeter-scale mesoporous carbon spheres. The preparation method comprises the following steps: mixing a phenolic precursor aqueous solution, an aldehyde precursor aqueous solution and a silicon dioxide aqueous solution, and performing prepolymerization to obtain a prepolymer solution; dropwise adding the prepolymer solution into liquid paraffin oil, carrying out reversed-phase suspension polymerization reaction, and then carrying out aging treatment to obtain phenolic resin spheres; calcining the phenolic resin spheres in an inert atmosphere to obtain millimeter-scale carbon spheres; and carrying out etching treatment on the millimeter-level carbon spheres to obtain the millimeter-level mesoporous carbon spheres. The invention creatively provides a pre-polymerization-molding-aging combined system in the engineering mass production of the millimeter-scale mesoporous carbon spheres, determines an amplified preparation process, and defines the influence of process parameters on the product quality; the engineering synthesis steps of the millimeter-scale mesoporous carbon spheres are optimized, the synthesis uncertainty is reduced, the cost of raw materials is reduced, and the large-scale production is facilitated.

Disclosed is a method for producing water-absorbent resin particles, which comprises: a step for preparing an aqueous liquid that contains a monomer of a (meth) acrylic acid compound containing at least one of (meth) acrylic acid or a salt thereof, protoanemonin, and water; a step for forming a particulate water-containing gel polymer containing a polymer of a monomer and water by reversed-phase suspension polymerization in a reaction liquid containing an aqueous liquid and a dispersion medium; and a step for extracting the water-absorbent resin particles containing the polymer from the reaction solution. The aqueous liquid containing protoanemonin in an amount of 6.0 ppm by mass or less relative to the amount of the (meth) acrylic acid compound is prepared.

The present application relates to a kind of hyperbranched polyvinyl fluoride resin prepared by suspension polymerization with chain transfer agent and its preparation and application, the preparation method of the resin includes: under the condition of using at least one initiator, at least one chain transfer agent, at least one dispersing agent, make polyvinyl fluoride occur polymerization reaction;The chain transfer agent is at least one chain transfer agent of multiple chain transfer sites (≥2) or the combination of liquid phase transfer agent and gas phase transfer agent forms multiple chain transfer sites.Compared with prior art, the polyvinyl fluoride resin of the present application has hyperbranched configuration, and high mechanical strength and good processing performance are considered, the resin is especially suitable for being used as the inner lining material of marine non-adhesive flexible riser, submarine cable packaging layer and other fields, its excellent chemical corrosion resistance, gas permeation resistance and heat aging performance can effectively block the erosion of external corrosive medium to internal tensile armor layer.

To provide a vinyl chloride-based polymer that has, when dissolved in a solvent, excellent filterability.SOLUTION: A method for producing a vinyl chloride-based polymer comprises a polymerization step of suspension-polymerizing a monomer mixture comprising vinyl chloride monomer and a monomer copolymerizable with vinyl chloride monomer in the presence of an aldehyde, wherein the added amount of the aldehyde is 0.1 wt.% to 4.0 wt.% relative to the weight of the monomer mixture, the whole charged amount of the monomer copolymerizable with vinyl chloride monomer relative to the whole charged amount of vinyl chloride monomer and the monomer copolymerizable with vinyl chloride monomer is 16.0 wt.% to 22.0 wt.%, and the amount of initial charge of vinyl chloride monomer relative to the whole charged amount of vinyl chloride monomer is 28.0 wt.% to 38.0 wt.%.SELECTED DRAWING: None

The invention relates to the technical field of polyvinyl chloride reaction monitoring, and discloses a method for monitoring pressure drop and conversion rate in a polyvinyl chloride reaction process. The method comprises the following steps: carrying out reaction initialization, adding desalted water, a vinyl chloride monomer, an initiator, a dispersant and an auxiliary agent into a polymerization kettle, controlling the initial reaction temperature and the stirring speed, and starting a suspension polymerization reaction; when the suspension polymerization reaction is carried out until the conversion rate reaches a preset threshold value, acquiring pressure drop data in the polymerization kettle in real time through a pressure sensor; calculating a current conversion rate by applying a preset pressure drop-conversion rate model based on the obtained pressure drop data; according to the current conversion rate obtained through calculation, terminator adding operation is executed to control the reaction process; and after the reaction regulation is completed, recovering the residual monomer and carrying out post-treatment to finally obtain a polyvinyl chloride resin finished product. The method is helpful for improving the stability and the product quality of polyvinyl chloride production.