1412 results about "Divinyl benzene" patented technology

Cement compositions comprising flexible, compressible beads, processes for preparing such cement compositions, and methods of cementing in subterranean formations using such cement compositions. One or more flexible, compressible beads are mixed with the cement before pumping the cement into a well bore. The flexible, compressible beads are preferably composed of an elastomeric material such as a copolymer of methylmethacrylate and acrylonitrile; a terpolymer of methylmethacrylate, acrylonitrile, and dichloroethane; a styrene-divinylbenzene copolymer; and polystyrene. The flexible, compressible beads may be heated to expand the beads before mixing with the cement such that the ensuing cement composition will have a desired density. Non-flexible beads such as spherulites may also be added to the cement compositions.

A distinctive graft copolymer is made by dissolving an alkyd resin in various vinyl monomers (methyl methacrylate, styrene, etc.). The monomer / alkyd solution is then miniemulsion polymerized to form a latex consisting of submicron particles of polymer with the alkyd grafted onto the polymer backbone. The latex can be applied to a substrate, which on drying forms a polymeric film with good film properties. The latex can be used in a latex paint formulation in place of an acrylate, acetate or styrene-divinyl benzene latex. In this way it is possible to produce water-borne alkyd coatings which combine the film hardness properties of an oil-based alkyd coating with easy application and cleanup. The coating will beneficially lack organic solvent exposure of typical standard latex coatings.

Plastic beads, including polyamides and polystyrene beads crosslinked with divinylbenzene, having a curable resin coating are highly useful for sand control and / or hydraulic fracturing of subterranean. The curable resin coated plastic beads preferably have an apparent specific gravity less than about 1.5.

The invention relates to the fields of analytical chemistry and food safety, in particular to a method for detecting the residual quantity of multiple alkaline drugs in animal derived food. Based on the vortex mixed extracting of acetonitrile, isopropanol and citric acid buffer solutions, the purification of a hydrophilic polystyrene-divinylbenzene solid phase extraction column and a cation exchange solid phase extraction column and the liquid phase chromatography-mass spectra determination, the method can detect the residual quantity of multiple alkaline drugs in pork, pork liver, eggs, shrimps and milk, such as beta-receptor agonists,sulfonamides, benzodiazepines, nitroimidazoles, benzimidazoles and triphenylmethanes. The method has the advantages of simple operation, fast and accurate detection and high efficiency.

The present invention relates to a liquid, cleaning and / or cleansing composition comprising abrasive cleaning particles, wherein said abrasive cleaning particles comprise a divinyl benzene cross-linked styrene polymer, wherein said abrasive cleaning particles are non-spherical and have a mean particles size D(v,0.9) of at least about 10 μm and wherein said liquid, cleaning and / or cleansing composition comprises from about 0% to about 30% by weight of the composition of an organic solvent.

The invention discloses a preparation method of integrated large-hole alumina, belonging to a preparation technique of integrated multi-hole inorganic oxide. The method comprises the following process: reverse concentrated emulsion method is adopted to prepare integrated large-hole organic template taking cinnamene and divinylbenzene as monomer; aluminum isopropoxide or pseudoboehmite is primarily used for preparing Al2O3 hydrosol; the Al2O3 hydrosol is filled into the integrated large-hole organic template; the filled integrated organic / inorganic composites are dried and then are roasted to remove the template, so as to obtain the integrated large-hole alumina. The invention has the advantages of simple and feasible preparation process, moreover the prepared integrated large-hole alumina has micrometer grade communicated large-hole channels (1-50um). The invention is applicable for catalyst carrier, absorption materials and separation materials.

The present invention provides a rubber composition which has satisfactory processability and dimension stability, exhibits excellent tensile strength and wearing resistance, and the like when vulcanized and is useful as a material for an industrial product such as a rubber roll, a grinding roll, a belt, a hose and a rubber-coated fabric, a shoe part for example of a transparent shoe, a tire of a large-sized or small sized car such as a tread and a side wall and a sanitary material such as a contraceptive rubber or the like. A rubber composition of the invention comprises (1) a crosslinked rubber particle containing as repeating units (a) 39.89 to 79.89% by weight of a conjugated diene unit such as 1,3-butadiene or the like, (b) 20 to 60% by weight of an aromatic vinyl unit such as styrene, (c) 0.01 to 10% by weight of a monomer unit having at least two polymerizable unsaturated group such as divinylbenzene, and the like, and (d) 0.1 to 30% by weight of a monomer unit having one polymerizable unsaturated group and an amino group such as vinylbenzylmethylamine, and the like and (2) a conjugated diene / aromatic vinyl copolymeric rubber such as styrene-butadiene copolymeric rubber and the like.

The invention discloses a polymer microsphere and preparation method thereof. The microsphere comprises a core and surface graft; wherein the core is monodispersed polystyrene-divinyl benzene microsphere with crosslinking degree of 60-90% and grain diameter of 2-20 microns, and the surface graft is polyglycidyl methacrylate or derivate thereof. Friedel-Crafts acylation is utilized, alpha-halogenacyllhalide is taken as acylation agent, initiator molecule is bonded on the surface of the microsphere; conventional atom transfer radical polymerization method is utilized to initiate monomers glycidyl methacrylate to condense; then different nucleopilic reagent is utilized for opening ring, and amino, hydroxyl, hydrazine, carboxyl and sulfydryl groups are introduced onto the surface of the microsphere. The polymer microsphere can be used as separation material for different chromatographs for high efficiency ion exchange, chelation and high efficiency affiliation, also can be used as carrier for fixing enzyme and catalyst and is an excellent functional microsphere.

The invention discloses novel liquid polycarbosilane which is low in viscosity and high in storage stability and is crosslinkable, a preparation method of novel liquid polycarbosilane, and an application of novel liquid polycarbosilane. Polycarbosilane is prepared by adopting chloromethyl alkoxy silane or mixtures of chloromethyl alkoxy silane as raw materials by virtue of Grignard coupling reaction and reduction reaction, and the structure of polycarbosilane is shown in a formula (I) in the specification. The structure simultaneously contains Si-H bonds and unsaturated bonds such as C=C bonds, can be subjected to self-crosslinking and curing under a certain condition, has relatively high ceramic yield, and can be used as a silicon carbide precursor of a polymer precursor impregnation pyrolysis (PIP) process. Polycarbosilane disclosed by the invention is adjustable in structural composition, good in storage stability, low in viscosity and relatively low in boiling point, and has the utilization potentiality of being used as a silicon carbide ceramic precursor for chemical vapor deposition / chemical vapor infiltration (CVD / CVI). In addition, polycarbosilane can also be used for replacing commonly-used divinyl benzene to serve as a crosslinking agent of solid-state polycarbosilane (PCS).

A butyl polymer having improved processability is described, together with a process for production thereof. The butyl polymer derived from a reaction mixture which contains: (i) a monomer mixture comprising a C4 to C7 monoolefin monomer (preferably isobutylene) and a C4 to C14 multiolefin monomer (preferably isoprene); (ii) a multiolefin cross-linking agent (preferably divinyl benzene); and (iii) a chain transfer agent (preferably diisobutylene (2,2,4-trimethyl-1-pentene)). The subject butyl polymer has an improved balance of cold flow, filler dispersion, extrusion rate and die swell.

The invention discloses a wave-absorbing ceramic made of a silicon carbide composite material and a preparation method thereof. The wave-absorbing ceramic has a multifunctional superimposed structure comprising a matching layer, a consuming layer and a reflecting layer, wherein each functional layer is made of a continuous silicon carbide fiber reinforced silicon carbide-based composite material;and continuous silicon carbide fibers serving as a reinforced material of each functional layer have different resistivity. The preparation method for the wave-absorbing ceramic comprises the following steps of: selecting continuous silicon carbide fiber plain cloth; dipping and cracking the plain cloth of the consuming layer; mixing with polycarbosilane, divinylbenzene, dimethylbenzene and the like to prepare slurry; performing mould pressing, thermal crosslinking and cracking to prepare a wave-absorbing ceramic rough blank; and preparing the wave-absorbing ceramic made of the silicon carbide composite material by adopting a precursor dipping and cracking process. The wave-absorbing ceramic has wide absorption frequency band, high mechanical property and heatproof function.

The present invention relates to a liquid, cleaning and / or cleansing composition comprising abrasive cleaning particles, wherein said abrasive cleaning particles comprise a divinyl benzene cross-linked styrene polymer, wherein said abrasive cleaning particles are non-spherical and have a mean particles size D(v,0.9) of at least about 10 μm and wherein said liquid, cleaning and / or cleansing composition comprises from about 0% to about 30% by weight of the composition of an organic solvent.

A method for the manufacture of a support matrix exhibiting amino groups I, possibly in acylated form, comprising the step of polymerizing one or more monovinyl monomers (monomer I) with one or more di- tri- or polyvinyl monomers (monomer II). The method is characterized in that that the polymerization is run in the presence of one or more amino-(C0-10)hydrocarbon vinyl aromatic monomers possibly in acylated form (monomer III). The preferred combination of monomers are ethyl vinyl benzene, divinyl benzene and amino styrene. The support matrix comprising a polyvinyl backbone [(-CH2CH2)n] and amino groups or groups derived from said amino groups while retaining the nitrogen of the amino group, each of which groups being attached to said backbone via a link structure containing an arylene group. The matrix is characterized in that each of said groups is directly attached via said nitrogen to said arylene group. Additionally, the use of the support matrix for solid phase synthesis, for instance of an oligo / poly-nucleotide or an oligo / polypeptide.

Cement compositions comprising flexible, compressible beads, processes for preparing such cement compositions, and methods of cementing in subterranean formations using such cement compositions. One or more flexible, compressible beads are mixed with the cement before pumping the cement into a well bore. The flexible, compressible beads are preferably composed of an elastomeric material such as a copolymer of methylmethacrylate and acrylonitrile; a terpolymer of methylmethacrylate, acrylonitrile, and dichloroethane; a styrene-divinylbenzene copolymer; and polystyrene. The flexible, compressible beads may be heated to expand the beads before mixing with the cement such that the ensuing cement composition will have a desired density. Non-flexible beads such as spherulites may also be added to the cement compositions.

An ink-jet recording water-based ink composition includes a polymer obtained by emulsion polymerization of a monomer having an ethylene-type unsaturated bond in the molecule and divinylbenzene in the presence of a reactive emulsifier, a polyethylene-based wax, a water-soluble resin, water, and a colorant. When ink coat is formed on a plastic film having a degree of gloss at 60° of 140 to 150 by discharging droplets of the ink composition onto the plastic film, the ink coat has a degree of gloss at 60° within a range of 50 to 120.

The invention discloses a method for manufacturing a homogeneous ion exchange membrane, which comprises the following steps: impregnating a polyethylene and ethylene-octylene copolymer elastomer blended alloy membrane or a polyethylene, ethylene-octylene copolymer elastomer, and polyisobutylene rubber blended alloy membrane, which serves as a substrate membrane, with solution of styrene, divinyl benzene and benzoyl peroxide, pressurizing and heating the impregnated membrane for polymerization to obtain a base membrane; and chloromethylating the base membrane in chloromethyl ether solution containing anhydrous stannic chloride to obtain a chloromethyl membrane, and quaternizing the chloromethyl membrane in aqueous solution of trimethylamine to obtain the ion exchange membrane. The method has the advantages of greatly reducing an impregnation temperature, and reusing solution of styrene and divinyl benzene. The capacity of the manufactured ion exchange membrane is up to 2.2 milligram equivalent per gram of dry membrane, and the sheet resistance of the manufactured ion exchange membrane is about 6 omega m<2>.

A method comprising the steps of: (A) forming a fluid comprising a crosslinked polymer, wherein the crosslinked polymer comprises: (i) a first monomeric unit of one or more N-vinyl lactams; and (ii) a crosslinker selected from the group consisting of: divinyl ether, diallyl ether, vinyl or allyl ethers of polyglycols or polyols, divinylbenzene, 1,3-divinylimidazolidin-2-one, divinyltetrahydropyrimidin-2(1H)-one, dienes, allyl amines, N-vinyl-3(E)-ethylidene pyrrolidone, ethylidene bis(N-vinylpyrrolidone), and any combination of any of the foregoing; and (B) introducing the fluid into a portion of a well. The crosslinked polymer may additionally comprise: a second monomeric unit selected from the group consisting of: acrylamide, N-substituted acrylamides, methacrylamide, N-substituted methacrylamides, acrylates, methacrylates, acrylic acid, methacrylic acid, N-vinylamides, N-allyl amides, vinyl alcohol, vinyl ethers, vinyl esters, allyl alcohol, allyl ethers, allyl esters, vinylpyridine, vinyl sulfonates, allyl sulfonates, vinylimidazole, allylimidazole, diallyldimethylammonium chloride, and any combination of any of the foregoing.

The produce discloses a kind of pyridyl modified composite functional adsorption resin with very high crosslinking degree and pyridyl radical as functional radical and its preparation process. The preparation process includes polymerization with styrene as monomer, divinyl benzene as cross-linking agent, liquid wax as pore-creating agent, magnesium carbonate as dispersant and benzoyl peroxide as initiator to produce low crosslinking degree macroporous polystyrene; the subsequent cross-liking reaction with swellant of nitrobenzene, etc. and catalyst Lewis acid, etc. to obtain composite functional resin precursor with different crosslinking degree; and final adding alpha-methyl pyridine for reaction to prepare the pyridyl modified composite functional adsorption resin. The resin has both adsorbing and ion exchanging functions, and may find its wide application in medicine separation, food decoloring, water treatment, etc.

The invention discloses a homogeneous anion exchange membrane as well as the preparation method thereof. The invention is characterized in that the homogeneous anion exchange membrane takes chloromethylated styrene, styrene or / and alkyl styrene as monomers, takes divinyl benzene as a cross-linking agent, takes benzoyl peroxide or azobisisobutyronitrile as an initiator, and takes bromomethylation poly (1,4- dimethyl2, 6- phenylene oxide) or chloroacetylized poly (1,4-dimethyl2, 6-phenylene oxide) as a polymer reinforcing agent, so as to prepare a uniform solution which is used for pasting a membrane on reinforced fabrics, and the homogeneous anion exchange membrane can be obtained by pretreating a basal membrane obtained by polymerization and then carrying out quaternary ammoniation. The invention obtains a functional group through adopting aromatic polymer, thereby the obtained anion exchange membrane has high exchange capacity, good electrochemical properties, uniform structure and good heat resistance; the slurry is homogeneous, thereby being easy for pasting; the monomers serving as the solvent can be polymerized, thereby being a green and solvent free process; the polymer content and the cross-linking degree can be adjusted, and the types of the sustainer can be changed, thereby obtaining products with different structural morphologies and functions.

The present invention discloses the synthesis of composite functional super high cross-linked adsorbing resin containing sulfo radical. The synthesis process of the present invention adopts styrene as monomer, divinyl benzene as cross-liking agent, liquid paraffin and other material as pore creating agent, magnesium sulfate and other material as dispersant, benzoyl peroxide as initiator, nitrobenzene and dichloro ethane or chloroben as sweller, and zinc chloride, ferric trichloride or tin tetrachloride and Lewis acid as catalyst, and prepares composite functional resin through preparing chloromethylated low cross-linked polystyrene resin, post-crosslinking reaction to obtain composite functional resin precursor of different crosslinking degree and final sulfonating with high concentration sulfuric acid to obtain composite functional resin with different specific surface area and different exchange capacity. The resin product has both adsorption and ion exchange function and thus wide application range.

This invention discloses a method for controlling the oxygen-containing functional groups on the surface of crosslinked polystyrene adsorption resins. The method uses styrene as the monomer, divinylbenzene as the crosslinking agent, liquid wax as the pore-forming agent, magnesium carbonate as the dispersant, and benzoyl peroxide as the initiator. The method comprises: (1) preparing macroporous styrene-divinylbenzene copolymer resins with a low crosslinking degree; (2) chloromethylating to obtain chloromethylated macroporous styrene-divinylbenzene copolymer resin balls; (3) swollening in nitrobenzene, adding the catalyst, introducing nitrogen, oxygen or air, and reacting to obtain crosslinked styrene-divinylbenzene copolymer resins having carbonyl, hydroxyl, ester or carboxyl on the surface. The resins can be used to treat industrial wastewater or extract drugs. The method has such advantages as simple process and simple equipment.

The invention relates to a method for purifying at least one enzyme obtained in an excess fermentation of Clostridium histolyticum. It is provided for that the enzymes of the excess fermentation are separated by a multistage chromatography method by exclusively using chromatography materials on styrene / divinyl-benzene base and / or on base of in particular ceramic hydroxylapatite.

The embodiment of the invention discloses a polymeric adsorbent and a preparation method thereof. The preparation method comprises the following steps of: preparing a bead-like resin from chloromethyl styrene serving as a polymerization monomer and divinyl benzene serving as a cross-linking agent by a suspension polymerization method; and adding a hydroxyl-containing monomer at the post-crosslinking stage to perform super cross-linking reaction so as to prepare the polymeric adsorbent. In the method, pores are formed in the polymeric adsorbent at the post-crosslinking stage of polychloromethyl styrene by using a chemical modification method, and polar groups are formed on the frame of the polymeric adsorbent by introducing the hydroxyl-containing monomer for modification, so the adsorption of an adsorbent substance by the polymeric adsorbent is increased. The preparation method provided by the invention is simple and the substances harmful to human body such as chloromethyl ether and the like and pore-forming agents are not used in the method. Experimental results show that the polymeric adsorbent prepared by the invention has the advantages of high specific surface area, small aperture, high adsorption selectivity and particularly high capacity of absorbing aromatic compounds.

Together with other accessory products, includes a mixture of ion-exchange resins, cationic and anionic, charged with Ca2+, F- and PO43- ions, in an approximate molar ratio of 2:1:1, respectively. Particularly preferred is a material in which the resins also have a charge of Zn2+ ions representing a proportion of less than 1%, preferably close to 0.2% of the dry weight of the resin. The preferred resins are those whose base is cross-linked polystyrene with 2-14% divinylbenzene. The material is useful as first filler in the treatment of caries, especially deep caries, leading to remineralization of the dentin with a composition very close to the original composition, together with high microhardness. It is also useful as a component of dentifrice products such as pastes, elixirs and dental floss.

A method for “tagging” proppants so that they can be tracked and monitored in a downhole environment, based on the use of composite proppant compositions comprising a particulate substrate coated by a material whose electromagnetic properties change at a detectable level under a mechanical stress such as the closure stress of a fracture. In another aspect, the invention relates to composite proppant compositions comprising coatings whose electromagnetic properties change under a mechanical stress such as the closure stress of a fracture. The substantially spherical composite proppants may comprise a thermoset nanocomposite particulate substrate where the matrix material comprises a terpolymer of styrene, ethylvinylbenzene and divinylbenzene, and carbon black particles possessing a length that is less than 0.5 microns in at least one principal axis direction incorporated as a nanofiller; upon which particulate substrate is placed a coating comprising a PZT alloy manifesting a strong piezoelectric effect or Terfenol-D manifesting giant magnetostrictive behavior to provide the ability to track in a downhole environment.

The invention relates to a method for analyzing carbon isotopes of micro single hydrocarbons in natural gas. The method is characterized by utilizing a divinyl benzene / carbon molecular sieve / polydimethylsiloxane (DVB / CAR / PDMS) composite adsorbing material to enrich the microcomponents in the hydrocarbons, carrying out thermal desorption at the gas chromatography injection port and carrying out separation through gas chromatography and analyzing the carbon isotopes of the single hydrocarbons by isotope ratio mass spectrometry. The method has the following beneficial effects: the method has the advantages of high carbon isotope testing precision and good repeatability, conforms to the research needs, is simple to operate and has good use and popularization values.

The present invention is preparation process of micron level monodispersed copolymer microsphere. Polystyrene seed is first prepared through a dispersed polymerization process; and then secondarily swelled and polymerized together with the composite monomer of styrene (St), divinyl benzene (DVB and ethylene glycol dimethyl acrylate (EGDMA) to prepare micron level St / DVB / EGDMA copolymer microsphere. The microsphere is regular, solid, homogeneous in grain size, monodispersed and heat resistant, and has strength and toughness meeting the requirement for making ACF.

The invention discloses a preparation method of intermediate-polarity macroporous adsorption resin, which comprises the following steps of: mixing 1-50 parts of styrene, 2-10 parts of hydroxyethyl acrylate and 50-100 parts of 80 percent divinylbenzene according to weight percentage as monomers, taking methylbenzene accounting for 50-200 percent of the total weight of monomers and carbon alcohol accounting for 33-135 percent of the total weight of monomers as mixed pore-foaming agents and taking benzoyl peroxide accounting for 0.1-2 percent of the total weight of monomers and azodiisobutyronitrile accounting for 0.1-2 percent of the total weight of monomers as initiators to obtain an oil phase; dissolving 0.2-1 part of polyvinyl alcohol, 0.5-1 part of gelatin and 5-10 parts of sodium chloride according to weight ratio into 100 parts of deionized water to obtain a water phase; feeding the oil phase into the water phase, rising temperature, reacting, filtering and extracting with acetone, and leaching with alcohol until a wash solution is clear; and obtaining macroporous cation resin.

The invention discloses a preparation method of a pigment dispersant. The dispersant is a graft-modified styrene-divinyl benzene-maleic anhydride-acrylic copolymer with a cross-linked structure. According to the synthetic process of the dispersant, firstly, in an organic solvent such as 1,4-dioxane, through polymerization of common free radical solutions, a low-molecular-weight cross-linked styrene-divinyl benzene-maleic anhydride-acrylic copolymer is obtained; after the reaction is completed, the solvent is not removed, fatty alcohol-polyoxyethylene ether or single-ended amino polyether and a catalyst are directly added for a grafting reaction, and finally the graft-modified styrene-divinyl benzene-maleic anhydride-acrylic copolymer with the cross-linked structure is obtained. Reaction equipment and process needed by synthesis of the pigment dispersant are simple, and waterborne color paste prepared from the dispersant has high tinting strength, adhesive force and storage stability.