22 results about "Inverse suspension polymerization" patented technology

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 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.

The embodiment of the invention provides a supramolecular composite microsphere as well as a preparation method and application thereof, and relates to the technical field of embolism microspheres. The preparation method of the supramolecular composite microspheres comprises the following steps that a water-phase solution and an oil-phase solution are mixed to form a water-in-oil reversed-phase suspension polymerization system, the water-phase solution comprises a water-soluble anionic monomer, a cross-linking agent, a water-soluble pore-forming agent, an initiator and water, and anionic hydrogel microspheres with pore channels are obtained through reaction; and mixing the cationic supramolecular compound with the anionic hydrogel microspheres, so that the cationic supramolecular compound is loaded on the pore channels and the surfaces of the anionic hydrogel microspheres under the action of charges to obtain the supramolecular composite microspheres. According to the preparation method of the supramolecular composite microsphere, the microsphere preparation process has controllability and convenience, and the prepared composite microsphere has excellent broad-spectrum drug loading capacity, has excellent hydrophilicity and mechanical properties, and is suitable for various application scenes such as TACE treatment and the like.

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 invention discloses a polymer surfactant for oil displacement, and relates to the field of tertiary oil recovery. The problem that the oil displacement efficiency and the swept volume of an existing common polymer in a class III oil layer are not obviously improved in the oil layer is mainly solved. The molecular structural formula is as shown in formula (1), wherein R is H or CH3; r1 = H, CH3 or (CH2CH2O) yCH3, and y is in the range of 1 to 20; r2 = CXaCX3, X is halogen, a is 0-2, n, m and p are polymerization degrees, and the numerical ranges of n, m and p are as follows: n is 1-100000, m is 1-20000 and p is 1-30000; the synthesis method comprises the following step: synthesizing the surfactant for oil displacement from a raw material comprising a polymerizable surface active monomer by adopting a photo-initiation solution polymerization method or a reversed-phase suspension polymerization method. The polymer surfactant can be used as a tertiary oil recovery oil-displacing agent, has high viscosity in sewage, has certain surface activity, and can be used for further improving the recovery efficiency after tertiary oil recovery and polymer flooding of medium and low permeability oil layers.

The present application belongs to the field of biomedical materials, discloses a kind of color embolization microspheres and its preparation method and application, color embolization microspheres are synthesized by dispersed phase and continuous phase for inverse suspension polymerization one-step method, dispersed phase is prepared by iodine alkenyl reactive dye, polyvinyl alcohol modified macromolecule solution, initiator and water for injection as main raw material, continuous phase is prepared by oil phase, dispersing agent and catalyst as main raw material;Iodine alkenyl reactive dye in dispersed phase is first obtained by substitution reaction of reactive dye and iodine element, periodic acid in reaction medium, iodine active dye, iodine active dye is then obtained by ring-opening addition under the catalysis of alkaline solution with epoxy butene;The color embolization microspheres synthesized by inverse suspension polymerization one-step method of the present application have the function of developing under X-ray, have drug loading function, dyeing is firm and not easy to decolor, and dyeing process is simple.

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.

The invention relates to an embolism microsphere with a photothermal effect and a preparation method and application thereof, and belongs to the technical field of embolism microspheres. The preparation method comprises the following steps: mixing starch and a cross-linking agent in water to obtain an aqueous phase solution; adding the water-phase solution into the oil-phase solution, and carrying out reversed-phase suspension polymerization reaction to obtain starch hydrogel microspheres; wherein the cross-linking agent comprises at least one of sodium trimetaphosphate or sodium tripolyphosphate; oxidizing the starch hydrogel microspheres with sodium periodate to obtain oxidized starch microspheres; the oxidized starch microspheres are subjected to surface modification by adopting dopamine, a polydopamine coating layer is formed on the surfaces of the oxidized starch microspheres, and the embolism microspheres with the photothermal effect are obtained. The embolism microspheres have degradability and drug loading performance at the same time, embolism-chemotherapy-photothermal triple therapy is cooperated, drug release can be controlled through the photothermal effect, and therefore the embolism microspheres can be effectively used for TAE or TACE treatment.

The application provides a preparation method and application of a powder battery binder. The preparation of the powder battery binder comprises the following steps: S1: mixing an aqueous phase mixed solution and an oil phase solution, and then performing inverse suspension polymerization to obtain a suspension; S2: performing post-crosslinking treatment on the suspension to obtain a modified suspension; and S3: removing residual oil phase and water from the modified suspension, and then drying to obtain the powder battery binder. The powder battery binder can avoid the introduction of moisture into positive and negative active materials of a battery, so that the safety performance of the battery is improved, can be used as a binder for the positive and negative active materials, and can reduce the transportation cost of the binder.

Disclosed is a method for producing water-absorbent resin particles, which comprises the steps of: polymerizing a water-soluble ethylenically unsaturated monomer by reversed-phase suspension polymerization in a reaction solution containing a surfactant having an HLB of 7-16 (inclusive), thereby forming a water-containing gel-like polymer; forming agglomerated particles; forming a concentrate by extracting a portion of the water; and surface-crosslinking the agglomerated particles in a mixture containing the concentrate and a surface-crosslinking agent. The amount of the internal crosslinking agent is 0.093 mmol or less per 1 mol of the water-soluble ethylenically unsaturated monomer. The amount of the surfactant is 1.15 mass% or less based on the water-soluble ethylenically unsaturated monomer.

The invention relates to a cyclodextrin hyperbranched microsphere and a preparation method thereof, and belongs to the technical field of embolism microspheres. The preparation method of the cyclodextrin hyperbranched microspheres comprises the following steps: grafting glycidol on cyclodextrin in a hyperbranched manner to obtain a hyperbranched polymer; dissolving a hyperbranched polymer and a cross-linking agent in an alkaline solution to obtain a water phase solution; and adding the water-phase solution into the oil-phase solution to obtain a water-in-oil reversed-phase suspension polymerization system, and reacting to obtain the cyclodextrin hyperbranched microspheres. Cyclodextrin is grafted with glycidol to modify hydrophilic hydroxyl, and hydrophobic drug molecules are captured in combination with hydrophobic cavities of cyclodextrin molecules, so that the microspheres can effectively load drugs; moreover, the dense pore structure of the hyperbranched microsphere is combined with the embedding effect of the hydrophobic cavity, so that the microsphere has a good drug sustained-release effect.

The invention discloses a phase change material for an ice bag and a preparation method of the phase change material. The phase change material for the ice bag is prepared from ammonium chloride, super absorbent resin, nano silicon dioxide, sodium carboxymethyl cellulose and water. The super absorbent resin is prepared by taking chemically modified chitosan as a macromolecular cross-linking agent, sodium persulfate as an initiator and acrylic acid, 1-vinyl-2-pyrrolidone and 2-acrylamido-2-methylpropanesulfonic acid as monomers through reversed-phase suspension polymerization. Chitosan molecules are subjected to quaternization treatment and grafted with a polyethylene glycol chain segment, and then the chitosan molecules serve as a macromolecular cross-linking agent to participate in polymerization, so that a more stable and tough gel network structure can be formed, and invasion and migration of bacteria are hindered. Sulfonate ions with negative charges can form a firm hydration layer with water molecules, the swelling state of the gel in a salt solution is maintained, and nonionic hydrophilic groups on a polyethylene glycol chain segment and a pyrrolidone functional group can effectively improve the water absorption capacity of the material in the salt solution.

The invention discloses a preparation method of powdery polyacrylic acid thickener microspheres, and belongs to the technical field of high polymer material synthesis. The preparation method comprises the following steps: taking an unsaturated acidic monomer as a main monomer, taking a water-soluble bifunctional monomer as a crosslinking monomer, taking acrylamide and hydrophobic acrylic acid long-chain alkane ester as salt-tolerant functional monomers, taking a redox system as an initiation system, and taking a compound of Span-80 and LAE-6 as a surfactant; and carrying out polymerization reaction by adopting a reversed-phase suspension polymerization method, and carrying out water separation, cooling, filtering and drying after the reaction to obtain the powdery polyacrylic acid thickener microspheres. By introducing the hydrophobic long-chain monomer and optimizing the ratio of the emulsifier, the viscosity retention rate of the product in a high electrolyte environment is remarkably improved, and meanwhile, the product exists in a powder form, is convenient to store and transport, and is suitable for thickening application in the fields of oil exploitation, personal care products, printing and dyeing, food and the like.

Disclosed is a method for producing water-absorbent resin particles, which comprises the steps of: polymerizing a water-soluble ethylenically unsaturated monomer by reversed-phase suspension polymerization in a reaction solution containing a surfactant having an HLB of 7-16 (inclusive), thereby forming a water-containing gel-like polymer; forming agglomerated particles; extracting a portion of the water to form a concentrate; and surface-crosslinking the agglomerated particles in a mixture containing the concentrate and a surface-crosslinking agent. The amount of the internal crosslinking agent is 0.093 mmol or less per 1 mol of the water-soluble ethylenically unsaturated monomer. Polymer particles formed from the water-containing gel-like polymer before the formation of the agglomerated particles have a median diameter of 150 [mu] m or more. The mixture is formed by mixing a surface cross-linking agent and a concentrate containing water at a moisture content of 15-50% by mass (inclusive) based on the mass of the polymer.

The invention relates to lignin developing microspheres as well as a preparation method and application thereof, and belongs to the technical field of embolism agents. The preparation method comprises the following steps: grafting N-hydroxyalkyl acrylamide on lignin to obtain modified lignin; mixing the modified lignin solution, an ionic monomer and an initiator in an aqueous solution to obtain an aqueous phase solution; adding the water-phase solution into the oil-phase solution to form a water-in-oil reversed-phase suspension polymerization system, and reacting to obtain lignin hydrogel microspheres; performing iodination reaction on the lignin hydrogel microspheres and iodine simple substances and / or iodine-containing compounds to obtain the lignin developing microspheres. The lignin developing microsphere has good X-ray developing performance, high strength and elasticity and good catheter passing ability, and the clinical application range of the developing embolism microsphere is widened.

The invention relates to degradable developing embolism microspheres as well as a preparation method and application thereof, and belongs to the technical field of embolism microspheres. The preparation method of the degradable developing embolism microspheres comprises the following steps: mixing a nonionic iodine contrast agent with a plurality of hydroxyl groups and a cross-linking agent with at least two phosphate groups in an alkaline aqueous solution to obtain an aqueous phase solution; and mixing the water phase solution and the oil phase solution to form a water-in-oil reversed-phase suspension polymerization system, and reacting to obtain the degradable developing embolism microspheres. A nonionic iodine contrast agent and a cross-linking agent with at least two phosphate groups are adopted for cross-linking polymerization, and under the alkaline condition, hydroxyl and the phosphate groups are subjected to a phosphate esterification reaction to form a three-dimensional cross-linked network; the iodine element introduced by the nonionic iodine contrast agent, the phosphate bond generated by the phosphate esterification reaction and the phosphate anions introduced by the cross-linking agent endow the microsphere with developing, drug-loading and degradable properties at the same time, and can be efficiently used for TACE treatment.

The invention relates to the technical field of chromatography medium preparation, in particular to glucan microspheres and a preparation method and application thereof. The preparation method comprises the following steps that S1, glucan, water, an inorganic pore-foaming agent, an organic pore-foaming agent, a hydrophilic surfactant and an activating agent are mixed to prepare a water phase, and the mass ratio of the inorganic pore-foaming agent to the organic pore-foaming agent is (1-10): (1-10); s2, mixing an organic solvent, an oleophylic surfactant and a cross-linking agent to obtain an oil phase; s3, mixing and stirring the oil phase and the water phase, and performing reversed-phase suspension polymerization to obtain glucan microspheres; the rotating speed of stirring is 200 to 700 rpm (revolutions per minute). The inorganic pore-foaming agent and the organic pore-foaming agent in specific dosage are compounded for use, the hydrophilic surfactant and the oleophylic surfactant have a synergistic effect, and the glucan microspheres prepared at a specific stirring speed can give consideration to both excellent resolution and pressure resistance, and can be used as a separation medium.

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 that contains (meth) acrylic acid or / and a salt thereof, an alcohol compound having 1-10 carbon atoms, 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 an alcohol compound in an amount of 800 ppm by mass or less relative to the amount of the (meth) acrylic acid compound is prepared.

This invention belongs to the field of polymer water-absorbing microsphere technology, specifically relating to a temperature-responsive water-absorbing microsphere, its preparation method, and its applications. The invention employs reverse-phase suspension polymerization, using liquid paraffin as the oil phase, Span 80 as the emulsifier, and mixing SA-NVCL aqueous solution, CS aqueous solution, and neutralized AA in a specific ratio to form the aqueous phase. N,N'-methylenebisacrylamide is used as the crosslinking agent, and potassium persulfate as the initiator. Polymerization is carried out at 75°C to obtain microspheres. The resulting microspheres are regularly spherical with an average particle size of 53.39 μm and a maximum swelling ratio of 615.46 g / g. They exhibit both pH-responsive and temperature-sensitive characteristics, good salt tolerance and cycling stability, and can significantly improve soil water retention and water holding capacity. The raw materials of this invention are green and biodegradable, the process is simple, the conditions are mild, and it is suitable for industrial production, possessing significant application value in agricultural water conservation and soil improvement in arid and high-temperature regions.

Disclosed is a method for producing water absorbent resin particles, the method comprising: forming a hydrous gel-like polymer that contains a polymer of a water-soluble ethylenically unsaturated monomer and water by reversed phase suspension polymerization in a reaction liquid that contains the water-soluble ethylenically unsaturated monomer, water, and a dispersion medium; removing water from the reaction liquid by heating the reaction liquid while stirring the reaction liquid with a stirring blade, which is fixed to a stirring shaft rotating in a concentration chamber, so as to form a concentrate which is a concentrated reaction liquid; and recovering polymer particles that contain the polymer from the concentrate. When the stirring shaft is inserted into the reaction liquid, the required stirring power calculated from a torque value for rotating the stirring shaft is 0.20 kW / m3 to 3.00 kW / m3 on average from a time point at which stirring of the reaction liquid is started to a time point at which the amount of water contained in the concentrate reaches 120 mass%.

The application relates to a preparation method of a high-friction-coefficient rubber roller composite material, and relates to a rubber roller material preparation method. 4-allyl-2-methoxy phenol and furfural are used as starting materials, an allyl phenolic aldehyde resin containing an unsaturated carbon-carbon double bond is prepared through a condensation reaction, then an allyl phenolic aldehyde resin containing an alcohol hydroxyl group is obtained under the action of an organic lithium catalyst, and finally the allyl phenolic aldehyde resin containing the alcohol hydroxyl group is crosslinked with N,N-methylene bisacrylamide crosslinking agent through reverse-phase suspension polymerization to prepare rigid nanoparticle microspheres. The obtained nanometer microspheres contain a large number of alcohol hydroxyl groups which can react with isocyanate groups, the rigid particles are added into a liquid rubber roller mixture containing polyhydric alcohol, isocyanate and a small-molecule chain extender, and a high-friction-coefficient polyurethane rubber roller can be obtained, and the application has a wide application prospect.