112 results about "Suspension polymerization" patented technology

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.

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.

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.

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 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 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 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 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.

The application provides a spherical lignin-phenolic resin and a preparation method and application thereof in adsorbing N-containing organic dyes, and belongs to the technical field of adsorbing materials. The lignin-phenolic resin with regular spherical morphology is prepared by one-step condensation polymerization reaction through the reverse suspension polymerization method under acid catalysis, wherein lignin, hydroquinone and trioxane are used as raw materials. The lignin belongs to renewable resources, has the characteristics of low cost and environmental friendliness, can replace phenol as the main phenol source, and the replacement rate can reach 75%. The yield of the synthesized phenolic resin is as high as 60-80%. In addition, the monomer type can be selected to introduce rich phenolic hydroxyl groups, sulfonic acid groups and other oxygen-containing groups in the resin, the monomer ratio is controlled to change the crosslinking structure of the resin, the adsorption capacity of the resin for N-containing organic dyes is effectively improved, and efficient adsorption of rhodamine B and methylene blue can be realized.

Provided is a polyvinyl alcohol resin in which, as a polymer component, substantially only a polyvinyl alcohol is contained, wherein the absorbance Abs320 of a 0.1 mass% aqueous solution of the polyvinyl alcohol resin when optical path length is 10 mm and wavelength is 320 nm is not less than 0.09, the ratio (Abs320 / Abs370) of the absorbance Abs320 to the absorbance Abs370 of a 0.1 mass% aqueous solution of the polyvinyl alcohol resin when optical path length is 10 mm and wavelength is 370 nm is not greater than 4.9, and the combined content of bivalent metallic elements and trivalent metallic elements is less than 30 μmol / g.

This invention discloses a bimodal styrene-acrylic resin, its preparation method, and its applications, belonging to the field of polymer materials. The method for preparing the bimodal styrene-acrylic resin provided by this invention first generates a prepolymer with a certain molecular weight (as a precursor for high molecular weight segments) through semi-continuous bulk polymerization; subsequently, a chain transfer agent is added during the suspension polymerization stage, and the growing polymer chains are quantitatively broken by chain transfer reaction to form low molecular weight segments and generate new active centers; by adjusting the concentration of the chain transfer agent, the short chain length can be controlled, and the bimodal molecular weight distribution of the styrene-acrylic resin can be precisely regulated. This allows for the simultaneous construction of high molecular weight and low molecular weight segments in the same resin system.

The invention relates to a synthesis method for improving the mechanical property of amidoxime resin, and belongs to the technical field of new material preparation. The method comprises the following steps: mixing a monomer containing carbon-nitrogen triple bonds, styrene, a dispersing agent, water, an initiator, a pore-foaming agent and a cross-linking agent to obtain a mixed material; sequentially carrying out first heat treatment and second heat treatment on the mixed material in a nitrogen environment to carry out suspension polymerization reaction to obtain an amidoxime resin precursor; mixing the amidoxime resin precursor, hydrazine hydrate and a first solvent to carry out a secondary cross-linking reaction to improve the cross-linking density and mechanical strength of an amidoxime resin skeleton so as to obtain a hydrazine hydrate modified highly-crosslinked precursor; and under a set pH condition, mixing the hydrazine hydrate modified highly-crosslinked precursor, hydroxylamine hydrochloride and a second solvent, and carrying out an amidoxime reaction to obtain the amidoxime resin.

This invention provides highly solvent-resistant organic particles using polymers with a cis-1,4-polyisoprene core, such as natural rubber. [Solution] A method for producing organic particles comprising the steps of: dissolving a polymer having cis-1,4-polyisoprene as the main skeleton in a solvent and carrying out a cyclization reaction to obtain a cyclized rubber with a cyclization rate of 60-90%; and suspend polymerization of the cyclized rubber and a vinyl monomer in the presence of water and a suspension stabilizer, wherein the Mooney viscosity [ML(1+4)100℃] of the polymer having cis-1,4-polyisoprene as the main skeleton is 18-65 as defined in JIS K 6300, and the vinyl monomer includes a monofunctional vinyl monomer having only one vinyl group and a crosslinkable vinyl monomer having multiple vinyl groups.

The invention discloses a double-sided interfacial polymerization nanofiltration membrane with a gradient pore structure as well as a preparation method and application thereof, and belongs to the technical field of membrane separation. The method comprises the following steps: firstly, coating two sides of a non-woven fabric with a nanofiber solution, and performing pre-drying and hot-pressing drying to prepare a double-sided shrinkage cavity non-woven fabric with a nanoscale surface aperture; and then vertically suspending the base material, sequentially dipping the base material in a water-phase monomer solution and an oil-phase monomer solution, and synchronously forming polyamide separation layers on the two sides of the base material through an interfacial polymerization reaction, thereby finally obtaining the double-sided nanofiltration membrane. The core of the invention lies in that a gradient pore structure from a micron-sized non-woven fabric and a submicron-sized nanofiber layer to a nano-sized polyamide separation layer is constructed through a unique base material treatment and vertical suspension polymerization process, and the mass transfer resistance is effectively reduced, so that the water flux and separation selectivity of the membrane are synergistically improved. The prepared nanofiltration membrane has the advantages of double-sided availability, high flux, high interception, strong anti-pollution performance and the like, and is simple in process and suitable for large-scale production.

This invention discloses a polyvinylidene fluoride (PVDF) resin, its preparation method, and its application. The preparation method includes the following steps: (1) preparing PVDF resin emulsion particles by emulsion polymerization of PVDF monomer; (2) adding a reducing agent and a fluorinated solvent to the obtained PVDF resin emulsion particles; (3) adding PVDF monomer, a dispersant, and an oil-soluble initiator to the emulsion obtained in step (2), and then heating to carry out a suspension polymerization reaction; (4) separating the product after the suspension polymerization is completed to obtain the PVDF resin. The PVDF resin of this invention has high flexibility, high product purity, and high adhesion.

This invention discloses a method for preparing a copolymer ultrafiltration membrane with a bonded structure. This method combines in-situ suspension polymerization, click reaction, sol-gel method, and solvent-inducible phase separation to prepare the copolymer ultrafiltration membrane. Excellent hydrophilicity and component stability of the ultrafiltration membrane are achieved through stable covalent bonding between tannic acid and the copolymer. This invention also combines in-situ click reaction and sol-gel reaction to stably introduce high-performance resveratrol into the polymer membrane. Stable bonding of the components is achieved through co-hydrolysis and condensation of the copolymer and the siloxane on the modified resveratrol during the film formation process. The polymerization process of this invention is simple and the structure is tunable. The prepared copolymer ultrafiltration membrane not only has excellent hydrophilicity and antifouling ability but also a stable structure.

The application discloses a preparation method of polyvinylidene fluoride resin, and the method comprises the following steps: (1) adding a polymerization stabilizer into water and mixing to obtain a polymerization stabilizer solution; (2) adding deionized water, a dispersing agent and an initiator into a reactor, then adding a bottom layer of polyvinylidene fluoride monomer, and then performing a suspension polymerization reaction by heating, and continuously adding the polyvinylidene fluoride monomer into the reactor during the reaction process; (3) after the polyvinylidene fluoride monomer is completely added, maintaining the temperature of the reactor, reducing the pressure in the reactor to 72-85% of the reaction pressure, adding the polymerization stabilizer solution prepared in the step (1) and reducing the temperature; (4) after the temperature in the reactor is reduced to normal temperature, discharging the product, and performing filtering, washing and drying on the product, thereby obtaining high-purity polyvinylidene fluoride resin. The polyvinylidene fluoride resin prepared by the polymerization process has the advantages of narrow molecular weight distribution, excellent basic performances such as heat resistance, and the process is safe and reliable, and has high production efficiency.

The present invention relates to a method for producing polystyrene, in particular expandable polystyrene, by suspension polymerization, and also to the polystyrene obtained by such a method. The invention also relates to the use of an organic peroxide of formula (I) for producing expandable polystyrenes, and to a composition comprising at least one organic peroxide of formula (I) and a halogenated flame retardant.

Provided is a production method by which the amount of a heating medium to be used in a process for producing water-absorbing resin particles can be reduced and the water-absorbing resin particles can be efficiently produced.　This method for producing water-absorbing resin particles comprises a polymerization step, a concentration step, and a drying step in this order. In the polymerization step, a reaction liquid comprising a polymer of a water-soluble, ethylenically unsaturated monomer, water, and a dispersion medium is produced by reversed-phase suspension polymerization. In the concentration step, water is removed by azeotropic distillation while the dispersion medium of the reaction liquid is being refluxed to the reaction liquid, thereby reducing the water content of the reaction liquid to produce a concentrate. In the drying step, the concentrate is dried while being exposed to air, thereby producing a dried object. The content of residual water in the concentrate to be dried in the drying step is 72 mass% or greater with respect to the total mass of the polymer contained in the concentrate.

The present application relates to a treatment and recovery method of 2-adamantanone production waste sulfuric acid solution, which comprises the following steps: preparing a paste slurry composed of inorganic mineral bentonite, alkane organic solvent and dilute sulfuric acid solution, mixing the paste slurry into the waste sulfuric acid solution, removing the suspended polymer colloid in the waste sulfuric acid solution by condensation and evaporation and hydrogen peroxide oxidation treatment, and removing the sulfur dioxide in the waste sulfuric acid solution by condensation and evaporation and hydrogen peroxide oxidation treatment, so as to obtain a relatively pure dilute sulfuric acid solution which can be directly used. The present application has simple operation and low treatment cost, and the recovered dilute sulfuric acid solution can be directly used.

The invention relates to the technical field of high polymer material auxiliaries, and particularly discloses a preparation method of a silicone-coated PTFE anti-dripping agent, which comprises the following steps: 1, preparing an anchoring separant, mixing silicone rubber, inorganic powder and a coupling agent, and carrying out dynamic grafting reaction under the action of an initiator to construct an intermediate with a chemical bonding structure; 2, preparation of an anti-dripping agent: S1, mixing suspension polymerization PTFE with an anchoring separant in a high-speed mixer, and disassembling PTFE aggregate; s2, at a specific rotating speed, spraying a liquid silicone coating agent into the machine through an atomizing nozzle for wet mixing, so that a liquid phase forms a uniform adsorption layer on the surface of the anchoring separant; s3, after cooling, emulsion polymerization PTFE is added for low-speed mixing, and early fibrosis is prevented; and S4, standing and aging to enable the interface to reach adsorption equilibrium. According to the anti-dripping agent, the problem of crystal points caused by easy agglomeration of PTFE in a matrix is solved, so that the prepared anti-dripping agent improves the surface quality and mechanical toughness of a highlight injection molded part while ensuring the flame retardant property.

The invention provides a CaCO3 / polymer-based plugging agent, a preparation method thereof and a water-based drilling fluid, the preparation method of the CaCO3 / polymer-based plugging agent comprises the following steps: S1, synthesizing CaCO3 in the presence of a modifier to obtain modified CaCO3; s2, taking the modified CaCO3 and a functional monomer as raw materials, adding a cross-linking agent, an initiator and a dispersing agent, and synthesizing a CaCO3 / polymer-based plugging agent by adopting a reversed-phase suspension polymerization method; wherein the functional monomers are styrene, acrylamide and N-vinyl pyrrolidone. The water-based drilling fluid based on the CaCO3 / polymer-based plugging agent is low in cost, has a good plugging effect, has temperature resistance and pressure bearing performance, and can solve the problem of well wall instability of a high-temperature well section.