1834 results about "Suspension polymerization" patented technology

This invention provides novel methods for the formation of biocompatible membranes around biological materials using photopolymerization of water soluble molecules. The membranes can be used as a covering to encapsulate biological materials or biomedical devices, as a “glue” to cause more than one biological substance to adhere together, or as carriers for biologically active species. Several methods for forming these membranes are provided. Each of these methods utilizes a polymerization system containing water-soluble macromers, species, which are at once polymers and macromolecules capable of further polymerization. The macromers are polymerized using a photoinitiator (such as a dye), optionally a cocatalyst, optionally an accelerator, and radiation in the form of visible or long wavelength UV light. The reaction occurs either by suspension polymerization or by interfacial polymerization. The polymer membrane can be formed directly on the surface of the biological material, or it can be formed on material, which is already encapsulated.

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 present invention is directed, in part, to improved nanocomposite compositions and processes for preparing same. Specifically, in one embodiment, there is provided a process for preparing an aqueous nanocomposite dispersion, wherein the process comprises: polymerizing via suspension polymerization a suspension comprising at least one ethylenically unsaturated monomer and a hydrophobically modified clay to form the nanocomposite dispersion after polymerization, wherein the hydrophobically modified clay is dispersed in the monomer. Other embodiments include processes for preparing aqueous nanocomposite particles, colloids, and dispersions using hydrophobically modified clays in aqueous systems and compositions comprising same.

A process for preparing expandable particulate styrene polymers wherein from 5 to 50% by weight of expanded graphite and also, if desired, from 2 to 20% by weight of a phosphorus compound, are present as flame retardants, by suspension polymerization of styrene in the presence of the flame retardants.

The invention belongs to the technical field of preparation of phase change materials and microcapsules, and specifically relates to a method for preparing a hollow polymer microsphere coated with a phase change material. The method comprises the following steps of: performing surface modification on hydrophilic inorganic nanoparticles by an ionic surfactant, and adding the phase change material and monomers to the modified inorganic nanoparticles, which are taken as a stabilizer, to prepare the hollow polymer microsphere coated with the phase change material through a Pickering suspension polymerization method. The preparation process is simple, the raw materials are cheap and easily available, the inner wall of the prepared hollow polymer microsphere is made from polymers, the outer layer of the prepared hollow polymer microsphere is made from the inorganic nanoparticles, and the organic phase change material is coated inside the prepared hollow polymer microsphere. The prepared microsphere has a small size, the coating rate of the phase change material is high, and the outer inorganic nanoparticle layer enhances thermal stability, heat transfer efficiency, sealing performance and mechanical properties of the microsphere.

The invention relates to thermoexpandable thermoplastic microspheres which are mainly prepared by carrying out suspension polymerization on olefine polymerizable monomers and expandable substances. The thermoexpandable thermoplastic microspheres have a core-shell structure which uses the thermoplastic polymers as the shell and the expandable substances as the cure. The invention is characterized in that on the basis of 100 wt% as the total weight of the olefine polymerizable monomers, the olefine polymerizable monomers are composed of 30-90 wt% of acrylonitrile, 5-50 wt% of methacrylate monomers, 1-20 wt% of acrylamide monomers, 0.01-1.0 wt% of fluorine-containing acrylate monomers and 0-40 wt% of acrylic monomers. The start T of the thermoexpandable thermoplastic microspheres is 160-200 DEG C.

Reversed phase suspension polymerization is allowed while controlling content of minor components in monomer, particularly controlling a content of acetic acid and propionic acid being not higher than 500 ppm, controlling a content of acrylic acid dimer being not higher than 1000 ppm, in acrylic acid. Cross-linked polymer obtained by the polymerization is subjected to a surface crosslinking treatment without substantially using an organic solvent, and under heating at high temperature (150° C. or higher and 250° C. or lower). Thereafter, agglomeration is carried out without substantially using an organic solvent. Accordingly, a particulate water-absorbing agent including a water-absorbing resin having superior property, and being suited for practical applications at high concentrations in absorbing cores such as a diaper and the like without generation of any odor of the organic solvent can be obtained because no volatile organic compound is included.

To provide: a process in which a coarse gel itself is made not to form in the case of applying the aqueous solution polymerization; and a process in which the polymerization is mildly controlled and the production is stably carried out in the case of applying the reversed-phase suspension polymerization or static polymerization, in a production of a water-absorbent resin. In a production process for a water-absorbent resin, which comprises a polymerization step that includes the steps of carrying out polymerization, involving crosslinking, of an aqueous solution of a water-soluble unsaturated monomer including acrylic acid(salt);and at the same time carrying out fine division of the resultant hydrogel, or in a production process for a water-absorbent resin, which comprises the steps of carrying out polymerization, involving crosslinking, of an aqueous solution of a water-soluble unsaturated monomer including acrylic acid(salt);and carrying out fine division of the resultant hydrogel, or in a production process for a water-absorbent resin, which comprises a polymerization step that includes the steps of carrying out polymerization, involving crosslinking, of an aqueous solution of a water-soluble unsaturated monomer including acrylic acid(salt); and at the same time obtaining a finely divided hydrogel, the water-soluble unsaturated monomer is adjusted in order to contain furfural in an amount of 11 to 1,000 weight ppm (relative to the monomer).

The present invention belongs to the field of polymer material technology. Inorganic nano Sio2 partticle, organic olefin monomer and coupler as raw materials are subjected to emulsion polymerization or suspension polymerization in water as medium in the presence of various emulsifiers and initiator, so that the olefine polymer is grafted to the surface of inorganic nano SiO2 particle to form inorganic nano SiO2 particle core-organic olefin polymer shell structure. The composite particle is spherical, has homogeneous particle size smaller than 100 nm, and has high grafting rate and high grafting efficiency. The prepared compoisite olefin polymer/SiO2 particle material has wide application in the development of nano technology.

The present invention provides thermoplastic roofing membranes comprising particles of crosslinked rubber and an aqueous (co)polymer dispersion. The thermoplastic roofing membranes are formed by combining particles of crosslinked rubber and a suspension polymer dispersion, or a coagulated aqueous latex (co)polymer dispersion, to form a mixture in aqueous dispersion, which aqueous dispersion mixture is subjected to solid state shear pulverization to form materials that can be processed as thermoplastics at crosslinked rubber concentrations of from 10 wt.% to as high as 95 wt.%, based on the total solids of the material. The method may further comprise kneading the pulverized product, followed by extrusion to form roofing membranes.

The invention discloses a water holding slow-controlled releasing fertilizer and a preparation method thereof, belonging to the technical field of agricultural fertilizers and preparation thereof. Macromolecule coating fertilizer is taken as an inner core and a water holding layer is taken as an outside layer to form a double-coating water holding slow-controlled releasing fertilizer; an inner coating is macromolecule protective layer coating material with nutrition controlling and releasing property; an outside coating is the water holding layer with excellent water holding property. Water retention agent suspension liquid is sprayed to the surface of macromolecule coating fertilizer grains for outside coating; wherein the water retention agent is prepared by taking cyclohexane, emulsifier, acrylic acid, acrylamide, sodium hydroxide, cross linker and evocating agent and adopting the method of opposite phase suspension polymerization. The fertilizer has the function of controlled releasing, drought resistance, water saving, water holding and soil improving and the advantages of high absorption percentage, wear resistance, difficult falling and the like; utilization ratio of liquid manure is improved and the fertilizer can be widely used to desert control, lawn plant, soil improvement, gardening, agriculture and forestry and the like.

The invention a high oil-absorbing resin, which is prepared from monomer, cross-linking agent, pore forming agent, initiator and dispersant at a ratio of 100:(1.2-2.8):(10-50):(0.2-2):(0.1-0.5) by initiating suspension polymerization in a nitrogen gas protective atmosphere via free-radical. The high oil-absorbing resin is adopted as an adsorbent in abandoned oil recovery treatment, for example, the high oil-absorbing resin which accounts for 2.5wt%-10wt% of the oil amount of a waste transformer is added to an oil water mixture of the waste transformer, and the waste transformer oil in waste water can be absorbed by resin and condensed into gel blocks, so as to separate from the water. The gel blocks containing the waste transformer oil is removed by filtering with a filter screen. The tank water can be discharged in a pollution-free manner. The oil product is recovered from the gel blocks containing the oil by distillation. The resin can be utilized repeatedly. The abandoned oil recovery treatment method adopting the high oil-absorbing resin has the advantages of simple process and low processing cost, and conforms to the environmental requirements.

The invention discloses an organic solvent absorbing agent and a preparation method thereof. The organic solvent absorbing agent is prepared by carrying out suspension polymerization reaction on acrylics, methacrylates, styrene, a cross-linking agent and an initiating agent in the environment that water and a dispersing agent exist. The organic solvent absorbing agent disclosed by the invention has the advantages of wide absorbing range, high absorption rate, high absorption speed and the like; an absorbed surface has small viscosity and a certain jelly strength, the organic solvent absorbing agent is convenient to recover and recycle and good in industrial applicability. The organic solvent absorbing agent disclosed by the invention can be reused more than ten times, the problem of poor reusability of a conventional absorbing material is solved, the secondary pollution caused by emission of a used absorbing agent as a waste is effectively reduced, and meanwhile the effects that the resource utilization rate is improved and the cost is reduced are achieved. The organic solvent absorbing agent can be used for treatment of industrial solvent-containing wastewater, and leakage and emergent absorption of an organic solvent in chemical production and is high in practicability and has a broad development prospect.

The invention discloses a high oil absorbing resin, and a process for preparation comprises utilizing short-chain ester of (metyl group) acrylic acid, long-chain ester of acrylic acid and styrene monomer to be monomers, adding dispersing agent and surface active agent, and getting through suspension polymerization and random copolymerization under the condition of the existence of cross linker and initiating agent. The process for synthesizing has lithe time consumption, which can be industrialized, and high oil absorbing resin which is got has high oil absorbing efficiency, fast oil absorbing speed, and which can be recycled to be repeatedly used.

The present application is directed to methods for preparation of polymer particles in gel form and carbon materials made therefrom. The carbon materials comprise enhanced electrochemical properties and find utility in any number of electrical devices, for example, as electrode material in ultracapacitors or batteries. The methods herein can also be employed generally to improve emulsion and/or suspension polymerization processes by improved control of diffusion of acidic and basic species between the polymer and secondary phases.

The present invention provides a new dispersion stabilizer that satisfies, at a high level, the performances required for a dispersion stabilizer used for suspension polymerization. A method of producing a dispersion stabilizer that is useable for suspension polymerization of a vinyl compound and contains a vinyl alcohol polymer (A) includes producing the vinyl alcohol polymer (A) by heat-treating a vinyl alcohol polymer (B) at a temperature of 90 to 180° C. for 0.5 to 20 hours in an atmosphere in which an oxygen concentration is 8000 ppm or lower. The vinyl alcohol polymer (B) has a saponification degree of at least 60 mol % and contains a residual acetic acid group whose block character is in the range of 0.3 to 0.6.

The invention relates to a porous high oil absorption resin and a preparation method thereof. The preparation method reasonably proportions raw materials and performs suspension polymerization on the proportioned raw materials to prepare the porous high oil absorption resin, and comprises steps of dispersing, mixing, charging, suspension polymerization, extracting and conventional post-processing. The porous high oil absorption resin has high oil absorptivity, particularly for jet fuel.

A high-oil-absorbency resin is prepared from acrylate as monomer, ethanediol acrylate as cross-linking agent, gel or cellulose as disperser, active calcium phosphate as co-disperser, and azo or oganic peroxide as trigger through suspension polymerizing. Its granularity is 0.3-2 mm and has high oil absorbency (up to 37 times).