260 results about "Magnetic polymer" patented technology

The invention discloses a magnetic acrylic acid series strongly basic anion exchange microballoon resin and a preparation method thereof. The microballoon resin has the following structure: the resin skeleton is internally provided with magnetic particles, wherein A stands for a radical containing quaternary ammonium salt. The preparation method comprises the following steps: acrylic acid series substances serve as a monomer, the monomer is mixed with cross-linking agent and pore-forming agent to form oil phase; the oil phase is uniformly mixed with the magnetic particles and then suspension polymerization is carried out on the mixture; after going through amination and alkylation reaction, the polymerized magnetic polymer particles form the quaternary ammonium salt, namely the magnetic acrylic acid series strongly basic anion exchange microballoon resin. Exchange capacity of the resin is higher than any magnetic acrylic acid series strongly basic anion exchange microballoon resin ever found in existing literatures and reports and domestic market as well as foreign markets and can replace the traditional strongly basic anion exchange resin, thus being capable of being used for separating and removing soluble organisms in various water bodies, especially disinfection by-product precursor and multiple negative ions such as nitrate and phosphate.

The invention belongs to the field of advanced nano composite materials, and relates to a magnetic polymer/carbon-based microsphere material with a core-shell structure and a preparation method thereof. The preparation method comprises the steps of: by adopting a sol-gel chemical synthesis method, in an alcohol water phase, in the presence of an alkali catalyst, wrapping polymer resin macromolecule layer outside a magnetic nano particle to obtain a magnetic macromolecule microsphere with a core-shell structure, carbonizing the polymer resin macromolecule layer through high temperature roasting to obtain a magnetic carbon-based microsphere material with the core-shell structure; adding a macromolecule surfactant during preparation, removing a surfactant by carbonizing through roasting to obtain a magnetic carbon-based microsphere material with a cavity, which is of a core-shell structure. The composite microsphere has stronger magnetic responsiveness, and the surface of the composite microsphere can be further functionalized and a large quantity of hydrophobic substances are absorbed; the magnetic microsphere material with the cavity, which is of a core-shell structure, can be used in a nano reactor, drug sustained release, and large-capacity adsorption and separation. The preparation method is simple, is easily available in raw materials, and suitable for amplified production.

The invention relates to a preparation method of a magnetic microsphere with surface functional groups in the composite material technical field. Under the condition that magnetic nanometer particles exist, dispersion-polymerization is performed; during dispersion-polymerization functional monomers are added to make the surfaces of the magnetic nanometer particles carry functional groups, or/ and after finishing the dispersion-polymerization the magnetic microsphere is sulfonated to make the surfaces carry tetrafunctional groups; finally magnetic polymer microsphere solution is gotten, and then the magnetic polymer microsphere solution is magnetically separated, cleaned and dried to get a magnetic microsphere with surface functional groups. The magnetic microsphere has an advantage that the particle size and the surface functional groups are controllable. The invention has the advantages of simple and accurate method, high efficiency, low cost, and capability of application in the biology field.

The invention relates to a preparation method of a magnetic polymer inorganic composite micro-sphere and is technically characterized in that a suitable template agent is added and a magnetic polymer micro-sphere is obtained with a suspension polymerization method after porous magnetic particles with a sol-gal process are prepared. As the template agent is added in the processes of the sol-gal or hydro-thermal synthesis and is removed after the high-temperature calcinations, the magnetic particles are caused to have the porous structure, thus reducing the density of the magnetic particles and simplifying the preparation process of the magnetic micro-sphere. Magnetic composite micro-spheres with multiple function groups on the surfaces are prepared according to needs. The magnetic substance is porous and the density of the magnetic substance is effectively decreased, thus being beneficial to suspension polymerization. The porous magnetic particles with lower density simplify the process of suspension polymerization. The magnetic micro-spheres or porous magnetic composite micro-spheres with magnetic responsiveness can be prepared when small quantities of magnetic substances(less than 20 percent of usage of monomer) are added.

The invention relates to a preparing method ofa nano-magnetic polymer composite microsphere, which comprises the following steps: preparing a hydrophilic Fe3O4 magnetic liquid particle by using a chemical co-precipitation method; dissolving initiating agents and emulsifying agents by weight part into ionized water to prepare water phase, adding the hydrophilic Fe3O4 magnetic liquid particle and adding a monomer to obtain nano-magnetic seed emulsion through polymerization; dissolving initiating agents by weight part into ionized water, adding the nano-magnetic seed emulsion and then adding a monomer to obtain nano-magnetic polymer composite microsphere emulsion through polymerization; the emulsifying agents are sodium lauryl sulfate, sodium dodecyl sulfate or sodium dodecyl benzene sulfonate; the initiating agents are potassium peroxydisulfate, ammonium persulphate or sodium peroxydisulfate; the initiating agents are potassium peroxydisulfate, ammonium persulphate or sodium peroxydisulfate; the hydrophobic monomer is styrene or methyl methacrylate or a mixture of the styrene and the methyl methacrylate; the nano-magnetic polymer composite microspheres prepared by adopting a seed emulsion polymerization method have the superparamagnetism, have stronger magnetic responsiveness, have no uncoated magnetic particle and contain magnetic polymer microspheres and are narrow to distribute.

The invention relates to a software robot which can be applied to non-structural operation environments of pipeline maintenance, ruins searching and rescuing, military reconnaissance and the like. The software robot mainly comprises a matrix, differential magnetic rigid units or differential magnetic polymer composite materials, a control power source and a control circuit, the matrix comprises a head, a neck, a trunk, feet and a tail, the differential magnetic rigid units or the differential magnetic polymer composite materials are of a small laminated structure, four or more channels are circumferentially arranged in the trunk, the differential magnetic rigid units or the differential magnetic polymer composite materials are axially embedded in the channels, and integral bending and wriggling are achieved by controlling stroke of the differential magnetic rigid units or the differential magnetic polymer composite materials in the channels. According to the software robot, the built-in power source is used, the whole circuit is wrapped in the matrix so that the circuit is prevented from being eroded and destroyed by environments, forming processability and elasticity are good, and actions of the robot are flexible and continuous.

The invention specifically relates to surface carboxyl-functionalized core-shell type magnetic composite microballoons and a preparation method thereof, belonging to the technical field of functional materials. According to the invention, the core of the core-shell type magnetic composite microballoons is a magnetic ferriferrous oxide nanoparticle cluster, and the shell of the microballoons is a cross-linked carboxyl-containing polymer network. The preparation method comprises the following steps: at first, preparing the citric acid stabilized magnetic nanoparticle cluster (thereafter referred as magnetic cluster for short); then, modifying the surface of the magnetic cluster with active vinyl function groups by using the sol-gel method; finally, preparing the monodisperse core-shell type magnetic polymer composite microballoons which have high magnetic responsibility and contain abundant active carboxyl groups on their surface through distillation-precipitation polymerization. A variety of bioactive molecules can be bonded with the surface of the core-shell type microballoons through chemical modification for application in the field of biomedicine. Furthermore, the method can accurately control the thickness and cross-linking degree of the shell of polymers. The invention has the advantages of simple operation and controllable process and has a good application prospect.

Magnetic polymer microbeads and a method for preparing the same are provided. The method for preparing the magnetic polymer microbeads includes the following steps: preparing polymer particles; immersing the polymer particles into a solution in order to swell the polymer particles; adding magnetic nanoparticles to the solution and allowing the magnetic nanoparticlse to enter an interior of the polymer particles; and separating the polymer particles from the solution, wherein the polymer particle is made of polystyrene, or a copolymer containing styrene, and the solution includes a medium polar solvent. The average particle size of the magnetic polymer microbeads of the present invention ranges from submicrons to microns. The magnetic polymer microbeads of the present invention have high magnetization, and the various functional groups can be introduced onto the surfaces thereof. Therefore, the magnetic polymer microbeads of the present invention can be applied in many areas, and thereby they have high economic value.

The invention provides a preparation method for a magnetic polymer composite microsphere, which relates to a preparation method for an inorganic-organic composite material and a functional polymer composite material. The method comprises the following steps: 1) preparation of a nanometer Fe3O4 particle: a step of adding an alkaline solution into a compound solution containing Fe<3+> and Fe<2+> drop by drop under the protection of N2 and then carrying out solid-liquid separation, washing and vacuum drying; 2) preparation of a magnetic calcium alginate gel sphere: a step of uniformly mixing the nanometer Fe3O4 particle with calcium alginate gel and removing Cl<-> on the surface of the gel sphere through washing with water; and 3) preparation of the magnetic polymer composite microsphere: a step of adding the magnetic calcium alginate gel sphere into an acid solution of chitosan, immersing the gel sphere in glutaraldehyde and carrying out magnetic separation and vacuum drying so as to obtain the magnetic polymer composite microsphere. The method provided by the invention has the advantages of easy availability of raw materials, simple operation, high efficiency and the like; and the prepared microsphere has a uniform size, high thermal stability and mechanical stability and a strong adsorptive property, can be recovered and reused and is applicable to fields like wastewater treatment.

The invention discloses a PEN and Fe(CO)5 composite magnetic material and a preparation method thereof, and belongs to the technical field of magnetic polymer materials. PEN serves as an organic matrix, Fe(CO)5 serves as an inorganic filler, and the composite magnetic material is obtained after blending and prilling. Firstly, the Fe(CO)5 is subjected to surface modification, and a layer of phthalonitrile prepolymer is generated on the surface of the Fe(CO)5; due to a layer of organic matters rich in cyan coated on the surface, the Fe(CO)5 after surface modification can improve the interfacial adhesive force between the Fe(CO)5 inorganic filler and the PEN organic matrix, so that the PEN and the Fe(CO)5 are provided with a high-strength magnetic property while maintain an excellent mechanical property of the PEN after composition. According to the magnetic material and the preparation method thereof, the Fe(CO)5 can be filled as much as possible on the premise that the good mechanical property of the composite material is maintained, so that magnetic saturation strength of the composite material can be improved, the compatibility of inorganic fillers with polymers is improved, and processing defects are overcome.

The invention relates to a preparation method of a magnetic polymer heavy metal ion adsorbent. An improved chemical co-precipitation method is used for preparing magnetic nano particles, surface modification is conducted on the magnetic nano particles with gamma-choropropyltrimethoxysilane and polyethyleneimine to obtain polyethyleneimine modified magnetic nano particles, and finally, the polyethyleneimine modified magnetic nano particles and functional monomers are subjected to copolymerization to prepare the magnetic polymer heavy metal ion adsorbent with a multi-level cross-linking structure and multiple adsorption groups; the saturation magnetization is 3.5-15.5 emu/g, remanent flux density and coercive field strength both approach to zero, the paramagnetism and the magnetic responsiveness are provided, for a heavy metal ion aqueous solution with an initial concentration of 100-1000 mg/L, the heavy metal ion adsorption capacity reaches 35-450 mg/g, adsorption equilibrium can be reached in 50-100 min, the heavy metal ion adsorption capacity after 5-time recycling is more than 85% of the first adsorption capacity, and the method can be widely applied in heavy metal ion adsorption and separation, pollution abatement of heavy metal ions and the like.

A monometer-level microsphere of magnetic polymer is prepared from the hydrophilic monomers (acrylamide, acrylic acid, etc.) through preparing super-paramagnetic nm microspheres of iron oxide by chemical deposition method, adding emulsifier, trigger, cross-linking agent and said iron oxide microspheres, and reaction in redox or thermal triggering system. The resultant microsphere has super paramagnetism and adjustable granularity (70-140 nm).

The invention relates to a preparation method of a magnetic molecularly-imprinted polymer for separating and purifying ractopamine, aiming to solve the problem of leakage of magnetic ferroferric oxide in the processes of template elution and practical application of an existing magnetic ractopamine molecularly-imprinted polymer. The method comprises the steps of (1) preparing magnetic ferroferric oxide nano microspheres; (2) preparing an ATPS-modified ferroferric oxide material (ATPS-Fe3O4); (3) preparing a magnetic Fe3O4 functional monomer (MAC-ATPS-Fe3O4); (4) preparing a magnetic RAC molecularly-imprinted polymer (Fe3O4@MIPs). The prepared ractopamine magnetic molecularly-imprinted polymer disclosed by the invention is stable in performance, and can solve the problem of leakage of magnetic ferroferric oxide; the magnetic polymer has a relatively fast adsorption rate to ractopamine, meets the needs of rapid detection, has a rapid magnetic separation capacity, and is very suitable for field sample treatment.

The invention discloses a polar seed swelling method preparing for a micron-size magnetic polymer microballoon, which comprises the following steps: compounding the monodisperse polar seed by the means of high polymer polymerization; regarding the mixture of the polar double bonds carboxylate integral, the free radical initiator, the cross linking agent, the pore-creating agent as a preparing for the emulsion drop that organics adds to dissolving the dispersing stabilizor, the soluble salt, the inhibitor aqueous phase; mixing the seed with the emulsion drop; absorbing the organic facies in the seed microballoon by the water dispersing dielectric; getting the carboxylate polyaromatics microballoon by the thermal polymerization; getting the carboxy group polyaromatics microballoon in the condition of the alkali hydrolytic decomposition; adding to the mixed-ion solution containing the sufficient Fe2+ or Fe3; getting porous micron-size magnetic polymer microballoon by adding the strong aqua. The invention applies the polar polymer seed, which completes the swelling procedure in 24 hours, guarantees the homogeneity of the microballoon product; reduces the time.

The invention discloses a method of algae bloom through strong flocculate magnetic polymers and algaecide, which comprises the following steps: using strong flocculate nature of polyaluminium chloride ferric; mixing with hyper pure magnet power; getting magnetic strong flocculant suspension; putting into water body environment with rich of algae, nitrogen and phosphor; flocculating algae cell quickly; absorbing nitrogen and phosphor; forming big block dense flocculate body; using magnetic response property of super pure magnetic iron ore power; enriching algae cell under the function of foreign field; transporting out of water body area.

The invention provides a magnetic polymer particle. The magnetic polymer particle contains a polymer and one or more magnetic nuclei embedded in the polymer, wherein the magnetic nucleus is a magnetic particle with the surface having a silica coating. The invention also provides a preparation method of the magnetic polymer particle. The method comprises the following steps: forming the silica coating on the surface of the magnetic particle to obtain the magnetic nucleus; and embedding the magnetic nucleus in the polymer to form the magnetic polymer particle. The invention also provides an application of the magnetic polymer particle as a solid acid catalyst when the polymer in the magnetic polymer particle is a sulfonic acid cation exchange resin. The magnetic polymer particle prepared through the preparation method has a good structure stability, and still has a high magnetic retention rate even after multi-time physical or chemical treatment.

The invention discloses a method for preparing thiolated nano ferroferric oxide magnetic polymer composite material. The method comprises the following steps of: dissolving Fe2<+> and Fe3<+> in water, wherein a dropwise adding system is alkaline, heating, stirring to react, washing until the pH value is 7, and drying the reaction product; adding an ethane solution into the reaction product, heating, and adding an oleic acid with stirring; adding a dispersing agent, adding a monomer for polymerization, an epoxy functional monomer and a cross-linking agent, and performing ultrasonic dispersion;adding an initiator, heating, stirring to react, washing until the pH value is 7, performing magnetic separation and drying the reaction product; performing ultrasonic dispersion, adding an epoxy vulcanizing reagent, heating, stirring to react, washing until the pH value is 7, performing magnetic separation and drying the reaction product; and performing ultrasonic dispersion, dropwise adding NaHS solution, stirring to react, washing until the pH value is 7, performing magnetic separation and drying the reaction product to obtain the target product. The invention has the advantages of simple preparation method, low cost, uniform particle size distribution, stable performance and capability of absorbing and removing superstandard heavy metal Hg from water, of the obtained target product, innocent treatment, water resource protection and the like.

The invention provides a preparation method and an application of a core-shell magnetic composite microsphere capable of separating glycoprotein. The preparation method is characterized in that a core of the core-shell magnetic composite microsphere is a magnetic iron oxide black nanoparticle cluster and a shell is a crosslinked polymer network rich in carboxyl, then carboxyl and aminobenzene boron ester carry out amidation to carry out surface modification, and glycoprotein can be quickly separated and enriched under the physiological conditions via plenty of surface immobilized boron esters. The preparation method comprises the following steps of: firstly preparing a magnetic nanoparticle cluster with stable sodium citrate, secondly adopting a sol-gel method to modify the surface of the magnetic cluster with active vinyl functional groups, thirdly preparing high-magnetic-responsiveness monodispersed core-shell magnetic polymer composite microsphere rich in carboxyl on the surface via reflux precipitation polymerization, fourthly carrying out amidation on aminobenzene boron ester and carboxyl to modify the surface of the core-shell magnetic composite microsphere with plenty of boron ester groups and finally carrying out separation and enrichment on glycoprotein. The method provided by the invention is simple, is controllable in process, has higher glycoprotein separation and purification efficiency and can carry out separation and enrichment under the physiological conditions.

The invention belongs to the technical field of nano functional materials, and particularly relates to a core-shell type magnetic composite microsphere for the separation and purification of recombinant proteins and a preparation method thereof. A core of the core-shell type magnetic composite microsphere disclosed by the invention is a magnetic ferroferric oxide nano particle cluster, and a shell of the core-shell type magnetic composite microsphere is a crosslinked polymer network containing epoxy groups. The core-shell type magnetic composite microsphere is prepared through the following method implemented through the steps that: a magnetic nano particle cluster with stable sodium citrate is prepared firstly; then, by using a sol gel method, an active vinyl functional group is modified on the surface of the magnetic cluster; a high-magnetic-responsiveness monodispersed core-shell type magnetic composite microsphere of which the surface is rich in epoxy groups is prepared through distilling-precipitation polymerization; an iminodiacetic acid is adopted for carrying out ring-opening reaction with the epoxy groups and complexing nickel ions; finally, histidine marked proteins are separated and purified. The preparation method of the core-shell type magnetic composite microsphere is simple, controllable in process, and high in efficiency of separation and purification of recombinant proteins. According to the method disclosed by the invention, the thickness and crosslinking degree of a polymer shell layer and the density of surface functional groups can be precisely controlled, therefore, the method has a good application prospect.

The invention discloses a magnetic polymer microsphere for enzyme immobilization and a relative preparation method, which uses hydrophilic nanometer magnetic particles as magnetic material, uses vinyl compound as functional monomer, uses composite surface activator as disperser and uses inverse suspension polymerization technique to prepare the macromolecule polymer pear carrier with narrow grain distribution and superparamagnetic and hydrophilic expoy group. The immobilization penicillin acylase prepared by the magnetic carrier has high apparent activity as 330IU/g (humidity), and the immobilization enzyme can be recovered easily to be circulated by external magnetic field, thereby improving the utilization of immobilization. The preparation method has simple process, easy operation, low production cost and support for large-scale production.

The invention relates to a method for using a magnetic polymeric microsphere to separate rare earth ions. The method mainly comprises the following steps: preparing the magnetic polymeric microsphere with superparamagnetism, modifying the surface of the microsphere with functional groups capable of forming chelates with rare earth ions, so as to use the microsphere to separate rare earth ions in a water solution; and desorbing and recovering rare earth ions supported by the surface of the magnetic polymeric microsphere. The innovative point of the method is applying the magnetic polymeric microsphere to separation and enrichment of low-concentration rare earth ions. The method is simple and convenient in operational process and fast in separation speed, and the magnetic polymeric microsphere is large in adsorption capacity on rare earth ions and high in adsorption efficiency.

The invention relates to a method for preparing nano magnetic polymer composite microspheres, comprising the following steps: preparing hydrophobic ultrafine Fe3O4 particle dispersion in a chemical coprecipitation method; preparing hydrophobic ultrafine Fe3O4 particles in an acidifying way; dissolving the hydrophobic ultrafine Fe3O4 particles, initiator and super hydrophobic agent in a monomer; adding an ionic comonomer to deionized water to prepare a water phase; mixing an oil phase with the water phase; ultrasonically emulsifying the mixture of the oil phase and the water phase in the water bath to obtain emulsifier-free miniemulsion; and adding the emulsifier-free miniemulsion to a reactor so as to be polymerized for 12-24h at 50-90 DEG C to obtain the nano magnetic polymer composite microspheres. The monomer is hydrophobic monomer, the initiator is oil-soluble initiator, the super hydrophobic agent is hexadecane and the ionic comonomer is sodium p-styrene sulfonate or 2-acrylamide-2-methyl propane sulfonic acid. The nano magnetic polymer composite microspheres have the self-stabilizing superparamagnetism and the uniform magnetic content distribution.