441 results about "Suspension polymerization" patented technology

The invention relates to the technical field of phase change microcapsules, in particular to a polyurea / polyacrylate double-layer shell material phase change microcapsule and a preparation method thereof. The microcapsule sequentially comprises a phase change material core material, a polyacrylate shell material and a polyurea shell material from inside to outside, and is prepared from the following raw materials: a polyisocyanate monomer, an acrylate monomer, an acrylate functional monomer, an acrylate cross-linking agent, a chain extender, an initiator, a surfactant, a phase change material and water. According to the invention, polyurea interfacial polymerization and polyacrylate suspension polymerization are combined to form a double-layer shell material for coating to prepare the phase change microcapsule, so that the phase change microcapsule has excellent sealing property, durability and high enthalpy value performance.

The invention discloses a high-strength low-density proppant as well as a preparation method and an in-situ generation method thereof. The proppant is prepared by compounding recycled glass fiber reinforced plastic powder or glass fiber powder with different meshes and recycled glass fiber reinforced plastic powder in different proportions and blending a styrene system / unsaturated polyester resin system in different proportions. The glass fiber reinforced plastic powder as the filler can improve the mechanical properties of the proppant, such as strength and toughness. The matrix is made of polystyrene or unsaturated polyester or other high polymer materials and is low in density. Therefore, the proppant has the characteristics of high strength and low density. The invention discloses a preparation method of a high-strength and low-density proppant, which can produce the high-strength and low-density proppant with uniform particle size distribution on a large scale by adopting a suspension polymerization method, and can efficiently recover a large amount of glass fiber reinforced plastic wastes. The suspension polymerization method is simple to operate, the produced proppant is high in roundness and sphericity, the mining cost of a coal-bed gas well can be reduced, and the yield of coal-bed gas can be increased.

The invention discloses a porous lithium metatitanate type lithium ion sieve and a preparation method thereof, and belongs to the technical field of new materials. The preparation method comprises the following steps: synthesizing lithium metatitanate powder by taking titanium dioxide and lithium carbonate as raw materials through a solid-phase method; carrying out surface hydrophobic modification treatment on the lithium metatitanate powder by adopting a silane coupling agent to obtain modified lithium metatitanate powder; the preparation method comprises the following steps: by taking a water solution containing gelatin and a dispersing agent as a water phase and a mixed solution containing a styrene monomer, a divinylbenzene cross-linking agent, an initiator and a pore-forming agent as an oil phase, carrying out suspension polymerization to obtain composite particles; the composite particles are firstly eluted to remove the pore-forming agent, and then are subjected to acidification transformation, so that the lithium ion sieve with high mechanical strength, uniform particle size distribution, stable structure, good recycling effect and stable adsorption capacity is obtained, the use capability of the lithium ion sieve in the industrial application process is effectively improved, and the service life of the lithium ion sieve is prolonged. The technical problems that a powdery lithium ion sieve is high in solution loss, difficult to filter and the like are solved.

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 provides a suspension polymerization method for preparing polyvinylidene fluoride and application thereof, and the method comprises the following steps: polymerizing polyvinylidene fluoride in a polymerization reactor containing a dispersant, an initiator system, at least one chain transfer agent and water to form a polyvinylidene fluoride suspension; the initiator system comprises at least one first initiator and at least one second initiator, the first initiator being selected from one or more of the following: a peroxide C2-C12 carboxylic acid ester, a peroxide C2-C12 carboxylic acid, a persulfate, a C2-C10 alkyl peroxide, a C2-C12 acyl peroxide; the second initiator is a peroxide carbonate. Polyvinylidene fluoride prepared by the suspension polymerization method has higher molecular weight, higher melting point and wider molecular weight distribution, not only has excellent mechanical property, but also has good processability, wider use temperature range, good corrosion resistance and permeation resistance, excellent heat resistance and ageing resistance, and can be used for preparing the polyvinylidene fluoride material. The method is suitable for preparing the lining layer of the marine dynamic flexible riser.

The invention discloses a preparation method of polyvinylidene fluoride resin. The method comprises the following steps: (1) adding a polymerization stabilizer into water, and fully mixing to obtain a polymerization stabilizer solution; (2) adding deionized water, a dispersing agent and an initiator into the reactor, then adding a bottoming vinylidene fluoride monomer, then heating to carry out suspension polymerization reaction, and continuously supplementing the vinylidene fluoride monomer into the reactor in the reaction process; (3) adding all the vinylidene fluoride monomers, keeping the temperature of the reaction kettle unchanged, adding the polymerization stabilizer solution prepared in the step (1) when the pressure in the kettle is reduced to 72-85% of the reaction pressure, and cooling; and (4) reducing the temperature in the kettle to normal temperature, discharging, and filtering, washing and drying the product to obtain the high-purity polyvinylidene fluoride resin. The polyvinylidene fluoride resin prepared through the polymerization process is narrow in molecular weight distribution and excellent in basic performance such as heat resistance, and meanwhile the process is safe, reliable and high in production efficiency.

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 relates to the technical field of medical interventional therapy materials, and particularly discloses a preparation method of sodium hyaluronate embolism microspheres and the prepared embolism microspheres. The preparation method of the sodium hyaluronate embolization microspheres comprises the following steps: S1, adding methacrylic anhydride, N, N-dimethylformamide and sodium hydroxide into a sodium hyaluronate aqueous solution, reacting, adding sodium chloride, reacting, adding absolute ethyl alcohol, precipitating, filtering to remove filtrate, cleaning and drying; s2, preparing a mixture of methacrylated sodium hyaluronate, a monomer with negative charges, an initiator and water into a water phase; a mixture of oil soluble liquid and a dispersing agent is used as an oil phase; and under the protection of nitrogen, carrying out reverse suspension polymerization. According to the preparation method of the sodium hyaluronate embolization microspheres, the methylacryloylated sodium hyaluronate and the negatively charged monomer are copolymerized to introduce the negatively charged group, so that the microspheres can effectively load chemotherapeutic drugs, and the compression elasticity is high.

The invention provides a water-phase suspension polymerization method of acrylonitrile, polyacrylonitrile and a preparation method thereof, and relates to the technical field of carbon fiber spinning solution production, and the method comprises the following steps: preparing a suspension: preparing a water-phase composition containing an amphiphilic inorganic material; preparing an oil-phase composition containing acrylonitrile and an initiator, then mixing the water-phase composition and the oil-phase composition to obtain a layered liquid, and homogenizing the layered liquid to obtain a suspension; and polymerization: carrying out polymerization reaction on the suspension to obtain the polyacrylonitrile suspension. By adopting the suspending agent with negative potential on the surface, the initiator free radical with positive electricity dissolved in a water phase can be effectively adsorbed to form a new reaction site, so that a small amount of acrylonitrile mixed with water is subjected to aggregation reaction, and the conversion rate of acrylonitrile polymerization reaction is improved.

The invention discloses a macroporous resin material and a preparation method thereof, and macroporous resin with high specific surface area and excellent adsorption performance is obtained through a specific modified acrylate polymeric monomer and a preparation method of the macroporous resin material. The method comprises the following steps: reacting quercetin, methyl vanillate and acryloyl chloride to prepare a modified acrylate polymeric monomer, mixing the modified acrylate polymeric monomer with polyvinyl alcohol, ethylene glycol dimethacrylate, dodecanol, benzoyl peroxide and the like, and carrying out suspension polymerization to prepare the macroporous resin material. The prepared macroporous resin material has excellent performance in the aspects of pore structure, polarity and the like, can be widely applied to the related fields of adsorption separation and the like, and provides a new thought and method for research and development of the macroporous resin material.

The invention discloses a preparation method of ulinastatin adsorption resin, and belongs to the technical field of adsorption resin. Comprising the following steps: (1) preparing a water phase: adding pure water, gelatin, cellulose, sodium chloride and lignin into a reaction kettle until the materials are fully dissolved; (2) preparing an oil phase, wherein the oil phase contains divinylbenzene, methyl acrylate, benzoyl peroxide, tert-butyl peroxy-2-ethylhexanoate, triallyl isocyanurate, tripropanol alkyl trimethacrylate and methylbenzene, and the oil phase is uniformly stirred and mixed with the methylbenzene and the trivinylbenzene, the methyl acrylate, the benzoyl peroxide, the tert-butyl peroxy-2-ethylhexanoate, the triallyl isocyanurate, the tripropanol alkyl trimethacrylate and the methylbenzene; (3) suspension polymerization: putting the oil phase into the water phase, and carrying out staged heating reaction; (4) amination reaction; (5) alkylation reaction; and (6) acid-base alcohol treatment. Compared with the existing resin, the resin disclosed by the invention has the characteristics of high adsorption exchange rate, high desorption rate and high desorption concentration on ulinastatin, and the yield of ulinastatin is increased by 1.17 times compared with that of D215 resin.

The invention relates to the field of PVC, and particularly discloses low-odor PVC artificial leather which comprises a surface layer, a surface layer, a middle layer and base cloth, raw materials of the surface layer and the middle layer comprise polyvinyl chloride prepared through suspension polymerization, an acrylonitrile-butadiene copolymer, octyl amyl glycol dibenzoate and polypropylene intercalated sepiolite, and the artificial leather has low odor and high strength.

The invention discloses a preparation method of a sodium ion positive electrode binder, which is characterized in that a carboxyl-containing olefine acid monomer is introduced into a vinylidene fluoride structure, so that a carboxyl group is embedded into the molecular structure of the binder, and the dual functions of neutralization and binding are realized. According to the method, through emulsion or suspension polymerization, the prepared binder can gradually neutralize alkaline residues of the sodium ion positive electrode material in the preparation of the positive electrode slurry, and the problems of acid-base imbalance and impurity residues caused by traditional additional organic acid are avoided, so that the jelling phenomenon is effectively inhibited. The embedded design simplifies the formula, improves the material purity, and significantly improves the fluidity and coating consistency of the slurry. In addition, the introduction of carboxyl improves the bonding performance of the binder, reduces the use amount of the binder, and increases the filling proportion of the active material, thereby improving the specific energy of the battery, reducing the internal resistance, enhancing the peeling strength of the pole piece, prolonging the cycle life of the pole piece, and showing excellent stability in the application of the sodium ion battery.

The invention provides a preparation method and application of a powder battery binder. The preparation method of the powder battery binder comprises the following steps: S1, mixing a water-phase mixed solution and an oil-phase solution, and carrying out reversed-phase suspension polymerization to obtain a suspension; s2, carrying out post-crosslinking treatment on the suspension to obtain a modified suspension; and S3, removing the residual oil phase and water from the modified suspension, and then drying to obtain the powder battery binder. The powder battery binder can prevent water from being introduced into positive and negative active substances of a battery, so that the safety performance of the battery is improved, the powder battery binder can be used as the binder of the positive and negative active substances, and meanwhile, the transportation cost of the binder can be reduced.

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 invention provides highlight black ASA (acrylonitrile-styrene-acrylate) resin as well as a preparation method and application thereof. According to the method, the ASA resin is prepared by adopting a polymerization method, and the method comprises the following steps: adding an ASA graft copolymer serving as a rubber phase into a suspension polymerization system which serves as a plastic phase and contains styrene and acrylonitrile in an emulsion state, and adding a phase regulator into the suspension polymerization system to prepare the ASA resin. The ASA resin has the advantages that the ASA graft copolymer is used as a dispersion phase, charge balance on the surfaces of ASA emulsion particles in a suspension polymerization system can be broken, transition from an emulsion state to a suspension state in the suspension polymerization system is realized, and finally polymerization of styrene and acrylonitrile in the suspension state is realized; the ASA resin has the characteristic of an'island 'two-phase structure taking the styrene-acrylonitrile copolymer as a continuous phase, and the micromixing of two phases of rubber and plastic in the ASA resin is more uniform. The ASA resin disclosed by the invention has high gloss and high impact strength, and a high light black effect can be obtained after the ASA resin is dyed by a black dye.

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.

Disclosed is a method for producing water-absorbent resin particles, the method comprising: forming a hydrogel polymer by polymerizing a water-soluble ethylenically unsaturated monomer through reverse-phase suspension polymerization in a reaction solution containing a surfactant having an HLB of 7-16; forming aggregated particles; extracting some water to form a concentrate; and surface cross-linking the aggregated particles in a mixture containing the concentrate and a surface crosslinking agent. The amount of an internal cross-linking agent is 0.093 mmol or less per mole of the water-soluble ethylenically unsaturated monomer. The polymer particles formed from the hydrogel polymer before forming the aggregated particles have a median particle size of 150 μｍ or more. The mixture is formed by mixing a surface crosslinking agent with a concentrate containing water at a moisture content of 15-50 mass% on the basis of the mass of the polymer.

The invention relates to embolism microspheres with wrinkled surfaces and a preparation method of the embolism microspheres, and belongs to the technical field of medical instruments. The method comprises the following steps: dissolving a high-molecular polymer in water to prepare a high-molecular polymer solution; mixing and reacting the high-molecular polymer solution and a cross-linking agent to obtain a modified polymer solution; adding a water-soluble monomer and an initiator into the modified polymer solution, and mixing to obtain a water-phase solution; under a stirring state, adding the water phase solution into the oil phase solution containing the dispersing agent to obtain a water-in-oil reversed-phase suspension polymerization system; keeping a stirring state, and carrying out heating polymerization, purification and collection on the water-in-oil reversed-phase suspension polymerization system to obtain wet microspheres; standing the wet microspheres in an organic solvent, and removing the organic solvent to obtain transition microspheres; transferring the transition-state microspheres into a vacuum drying oven for drying to obtain dry-state microspheres; and soaking the dry microspheres in water to obtain the embolism microspheres with wrinkled surfaces. The method can improve the drug loading rate and drug loading capacity of the embolization microspheres.

The invention belongs to the technical field of high polymer materials, and particularly relates to styrene polymer microspheres as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, carrying out first mixing on water, an inorganic dispersant and an organic dispersant to obtain a water phase; s2, carrying out second mixing on a monomer, an initiator and a pore-foaming agent to obtain an oil phase; s3, adding the oil phase into the water phase, carrying out polymerization reaction, and carrying out cleaning and solid-liquid separation on a product to obtain styrene polymer microspheres; a suspension polymerization method is adopted, and an inorganic dispersant and an organic dispersant which have a synergistic effect are added in a water phase preparation process, so that the yield of the prepared styrene polymer microspheres is improved; when being used as a chromatography medium, the microspheres have excellent resolution.

The invention belongs to the field of binders, and particularly relates to a reversed-phase suspension polymerization aqueous binder for a lithium battery and a preparation method of the reversed-phase suspension polymerization aqueous binder. The reversed-phase suspension polymerization aqueous binder for the lithium battery provided by the invention is prepared from the following raw materials: polysaccharide, an acrylic monomer, a dispersing agent, an initiator, a cross-linking agent, neutralizing alkali, an oil-phase solvent and deionized water, and the product is prepared by adopting reversed-phase suspension polymerization. The reversed-phase suspension polymerization aqueous binder for the lithium battery has excellent binding performance, the 180-degree peel strength is larger than 8 N / m, and compared with the prior art, the reversed-phase suspension polymerization aqueous binder for the lithium battery has remarkable progress.

The invention relates to a long-acting antibacterial polyamide fiber and a preparation method thereof. The long-acting antibacterial polyamide fiber is prepared from 4wt%-20wt% of nylon-guanidine salt copolymer master batch and 80wt%-96wt% of nylon, and the preparation method of the long-acting antibacterial polyamide fiber comprises the following steps: carrying out melt blending reaction on polyepoxy polystyrene synthesized by a solution polymerization method or a suspension polymerization method or a bulk polymerization method and a guanidine salt polymer antibacterial agent to obtain a polystyrene-guanidine salt copolymer functional material; then carrying out melt blending with nylon to obtain nylon-guanidine salt copolymer master batch; and finally, blending, melting and spinning with nylon to obtain the long-acting antibacterial polyamide fiber. By adopting the nylon-guanidine salt copolymer master batch disclosed by the invention, on one hand, the antibacterial agent is chemically bonded to a polyamide matrix, so that the long-acting antibacterial property of the fiber is ensured; on the other hand, the antibacterial agent is enriched on the surface of the antibacterial polyamide fiber. When the dosage of the antibacterial agent is low, the long-acting antibacterial polyamide fiber shows excellent antibacterial performance, so that the good mechanical property of the long-acting antibacterial polyamide fiber is kept at the same time.

A method of producing a fluorine-containing copolymer includes performing suspension polymerization by using monomers including ethylene and tetrafluoroethylene in a polymerization medium including water and a polymerization solvent A that is not compatible with water and that is at least one kind selected from the group consisting of compounds represented by Formulae 1 to 3. In the method, the proportion of water to the polymerization medium is from 10% by volume to 80% by volume, the solubility of the polymerization solvent A to the water at 25°C is 500 g / L or less, and the solubility of the water to the polymerization solvent A at 25°C is 500 g / L or less. Descriptions regarding Formulae 1 to 3 are omitted.

The invention belongs to the field of pharmaceutic adjuvants, and particularly relates to a method for preparing sodium polystyrenesulfonate resin through a centrifugal interfacial membrane emulsification technology and application of the sodium polystyrenesulfonate resin. The method comprises the following steps: by taking a mixed solvent of styrene, divinylbenzene and benzoyl peroxide as a dispersion phase and a polyvinyl alcohol solution as a continuous phase, carrying out centrifugal interfacial membrane emulsification, then carrying out suspension polymerization reaction to obtain polystyrene-divinylbenzene microspheres with narrow particle size distribution, and finally, carrying out sulfonation reaction and alkali exchange to obtain the polystyrene-divinylbenzene composite microsphere. The final product sodium polystyrenesulfonate resin is obtained. The resin prepared by controlling the centrifugal rotating speed, the centrifugal time and the using amount of the dispersing agent, the cross-linking agent and the sulfonating agent and combining a centrifugal interfacial membrane emulsification technology is in a dry golden brown powder shape, the average particle size is 60-100 microns after the resin is dispersed in water, and particles of the resin are uniformly distributed and are of a spherical structure. Meanwhile, the preparation method is simple in preparation process, short in operation time, low in energy consumption, good in economic benefit, suitable for industrial production and wide in market application prospect.

Disclosed are a polyvinyl alcohol embolic microsphere with a core-shell structure, a preparation method therefor, and use thereof. According to the preparation method, polyvinyl alcohol is taken as a skeleton material, two modified polyvinyl alcohols with different grafting degrees are obtained by means of reacting N-(2,2-dimethoxy)-2-methylacrylamide with polyvinyl alcohol at different ratios, a water-soluble monomer with ionic functional groups and an initiator are mixed with an aqueous solution of low-grafting-degree polyvinyl alcohol to obtain a first aqueous phase, an initiator is mixed with an aqueous solution of high-grafting-degree polyvinyl alcohol to obtain a second aqueous phase, the two aqueous phases are added to an oil phase containing an oil-soluble dispersing agent to form a water-in-oil reverse-phase suspension polymerization system, and reverse-phase suspension polymerization is performed to obtain the polyvinyl alcohol embolic microsphere with a core-shell structure. The core-shell structure polyvinyl alcohol embolization microsphere exhibits an extremely fast drug loading rate and an extremely high drug loading capacity.

The invention relates to a heat-resistant agent for a transparent material and a preparation method of the heat-resistant agent, the heat-resistant agent is prepared from the following raw materials in parts by weight: 30-75 parts of an acrylate monomer, 10-30 parts of an aromatic vinyl monomer, 5-40 parts of a maleimide substance and 0.3-0.5 part of an initiator, and the heat-resistant agent is prepared by a suspension polymerization method. The heat-resistant agent prepared by the invention has excellent heat stability and glass transition temperature, the transparency of the transparent plastic is not influenced after the transparent plastic is added, the preparation process is simple, environment-friendly and low in cost, and the heat-resistant agent can be applied to engineering plastics with requirements on transparency and heat resistance.

The invention relates to the technical field of high polymer materials, and discloses a fluorine-containing fire extinguishing microcapsule and a preparation method thereof. A micro-suspension polymerization system is adopted, a reversible addition fragmentation chain transfer free radical polymerization technology is applied, and the fluorine-containing fire extinguishing microcapsule with a SiO2 / polymer composite shell layer wrapping a low-boiling-point fluoride core material is prepared. Reversible addition fragmentation chain transfer free radical polymerization adopted by the invention changes the dynamic characteristics of traditional free radical polymerization, a large number of low-molecular-weight oligomer chains are formed at the beginning of polymerization, the oligomer chains are easily diffused to an oil / water interface under thermodynamic driving, formation of a regular core-shell structure is promoted, and the uniformity of a shell chemical cross-linked network can be improved; therefore, the coating effect on the low-boiling-point fluoride core material is improved, toxic gases such as formaldehyde in the product can be avoided in the preparation process, and the preparation method has a wide application prospect.

The present invention provides a rubber microcapsule, its preparation method, and application, belonging to the field of polymer material technology. The rubber microcapsule of the present invention has a core-shell structure, wherein the shell is polystyrene and the core is liquid nitrile rubber dispersed with coated sulfur; the coated sulfur is sulfur coated with polystyrene on the surface; and the liquid nitrile rubber contains reactive end groups. By mixing the coated sulfur with the nitrile rubber containing reactive end groups and then coating the rubber particles with a polystyrene layer through suspension polymerization, rubber microcapsules with excellent toughening effects are produced. Epoxy resin compositions toughened with the rubber microcapsules exhibit excellent toughness, strength, and thermal properties.

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.