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For faster navigation, this Iframe is preloading the Wikiwand page for Amundsena€“Scott South Pole Station. Invention relates to technology of preparation of binder for lacquer materials, in particular to a method for preparing aqueous dispersion of low-molecular weight chlorosulfurized polyethylene for use in lacquer materials to protect building structures. Invention relates to a method of separating hydrocarbon rubber from a polymer suspension containing hydrocarbon rubber dispersed in a diluent.
Invention relates to a method of separating components of a suspension, containing particles of a copolymer (i) C4-C7 isomonoolefin and para-alkylstyrene or (ii) C4-C6 isoolefin and multiolefin, monomers and diluent; obtained and separated polymers are widely used in making chambers and inner linings in the tyre industry, as well as packages for accumulators and pharmaceutical packing accessories, glues, sealing agents etc. Invention deals with aqueous fluoropolymer dispersions containing no low-molecular weight fluorinated surfactant or containing the same in small amounts. Invention relates to a butyl-rubber based ionomer, a peroxide-vulcanised article made from a butyl rubber-based monomer, as well as an article having a substrate containing stainless steel material, glass material or mylar material, and a butyl rubber-based ionomer bonded to said substrate.
Present invention relates to a boron hydride metallocene lanthanoid complex, production method thereof, a catalyst system containing a boron hydride metallocene complex and a method for copolymerisation of olefins on said catalyst system. SUBSTANCE: method involves dissolving wet crumbs of butyl rubber in a hydrocarbon solvent by feeding wet rubber crumbs, solvent, feeding and removing a base polymer solution and removing water into a hollow apparatus having a mixing, a dissolving and a settling zone. The invention relates to the petrochemical industry and can be used in the production of halobutyl rubber.One of the longest stages of obtaining halo(chloro-, bromo)-butyl rubber by the method of treatment of a solution of butyl rubber free halogen or halogen-containing compound is the stage of preparation of a solution of the base polymer (butyl rubber) in a hydrocarbon solvent (in particular, in hexane or nerase), which is halogenoalkane.
The optimal ratio of height to diameter in the zone of sludge dissolution apparatus is in the range 1?2.
At step (b), a premix is obtained first, which is homogenised in the "soap-in-water" emulsion.
Proposed method comprises unloading suspension from reactor onto transfer line terminating at hardening chamber, forcing suspension via heat-isolated pipeline arranged horizontally, inclined upward, or vertically, or otherwise, and along pipeline nozzle fitted through hardening chamber wall, toward transfer line outlet. The weight fraction of the monomer (monomers) in the hydrocarbon rubber adhesive based on the total amount of hydrocarbon rubber contained in the hydrocarbon rubber adhesive is less than that of the monomer (monomers) in the hydrocarbon rubber suspension based on the total amount of hydrocarbon rubber contained in the hydrocarbon rubber suspension. The method involves polymerisation of higher ?-olefins on Ziegler-Natta catalysts in the medium of perfluorinated alkanes (PFA), such as aliphatic PFA, alicyclic PFA, as well as mixtures thereof with subsequent replacement of PFA with a dispersion medium containing an anti-agglomerator.
The method involves the following steps: (a) bringing a polymer suspension into contact with a hydrocarbon solvent capable of dissolving hydrocarbon rubber to obtain a first liquid phase and a second liquid phase and (b) separating the first liquid phase from the second liquid phase. The method involves mixing starting butyl rubber and a halogenating agent which is deposited on a solid support with a developed adsorptive surface capable of reversible sorption of halogen.
The disclosed complex has the following formula B: where the lanthanoid Ln is bonded with one molecular ligand consisting of two cyclopentadienyl groups Cp1 and Cp2, which are bonded to each other by a bridge P of formula MR1R2, where M is an element of subgroup IVA, such as Si, and R1 and R2, identical or different, denote an alkyl group containing 1-20 carbon atoms, L denotes an alkali metal such as Li, N denotes a molecule of a complexing solvent such as tetrahydrofuran, x is an integer or a noninteger greater than 0, p is an integer greater than or equal to 1, and y is an integer greater than or equal to 0.

The method involves contacting at least one polymer, having links derived from C4-C10 isoolefin, at least one halogen and at least one fluorohydrocarbon in a solution to obtain at least one halogenated polymer. The method involves preparation of a mixture from isobutylene, isoprene and returned products, copolymerisation of the mixture in a medium of a diluent - methyl chloride in several reactors working in parallel in the presence of an aluminium chloride catalyst, involving degassing the rubber, processing non-polymerised monomers and the diluent - methyl chloride, averaging, drying the ready polymer on extrusion-type machines and briquetting. The rubber crumbs are dissolved by circulating the base polymer solution collected in the top part of the apparatus into the bottom parts of dissolving zone and the mixing zone. The apparatus has a circulation of rubber solution from the zone of dilution in the mixing zone [A.S. The increase in this ratio higher than 8:1 leads to the ablation of crumb rubber discharged from the apparatus with water and a resulting decrease Mooney viscosity due to a longer stay in the mixing zone.
The decrease in this ratio leads to an increase in the amount of water and calcium stearate in a polymer solution.
A suspension of solid fluoropolymer particles from a group comprising a fluoroethylenepropylene polymer and a polymer of perfluoroalkoxy compounds together with PTFE particles in an aqueous liquid carrier is obtained. The dispersion medium used is higher aliphatic alcohols, glycols and mono- and di-subsituted ethers thereof, as well as mixtures thereof. A first suspension is prepared, containing particles of copolymer (i) and (ii), monomers and a diluent. The method involves the following steps: 1) suspension polymerisation using a diluent which contains at least one fluorohydrocarbon, with possibility of communication through a fluid medium with 2) a halogenation process to obtain at least one halogenated polymer. The copolymerisation process is carried out in the presence of two catalyst modifiers, one of which is water and the second is selected from a group of organic substances with general formula C6H5-X, where X is halogen or a radical with formula -CnH2n+1-Hal, where n=1-2. The ratio of the volume of the dissolving zone to that of the mixing zone is equal to 7-8:1, and the ratio of the height to the diameter of the apparatus in the dissolving zone is equal to 6-7 and in the settling zone 1-2.
If a solvent capable of mixing with the polymer in any proportions, after the first stage of swelling begins a gradual transition of polymer molecules in solution and their diffusion in the solvent to form true solutions. The ratio of height to diameter in the zone of dissolution apparatus should be within 6?7, the decrease of this ratio leads to an increase in the number of undissolved polymer, and the increase to the decrease in Mooney viscosity and a small increase of energy consumption, number is the number of undissolved polymer when it is no longer decreases. Calcium stearate on the site halogenation converted into stearic acid by interaction with HCl, stearic acid, forming a sodium soap when neutralization leads to difficulties in the isolation and drying of the rubber increases the rate of moisture content in the finished rubber, which significantly reduces its quality. In the second stage, reaction is carried out under the same conditions, after which mixture is cooled to 40-50°C. Besides, it comprises isolating pipeline nozzle from hardening chamber wall and hardening fluid.

The first liquid phase contains at least 60 wt % fluorohydrocarbon in terms of the total weight of fluorohydrocarbon in the polymer suspension. The diluent contains one or more flurohydrocarbons (FHC) of formula: CxHyFz, in which x is an integer from 1 to 40 and y and z are integers greater than or equal to one. Also disclosed are a method for obtaining dispersion of fluoropolymer particles and a method for depositing dispersion onto a substrate.
Upon contact with a hydrocarbon solvent crumb polymer enters the hydrocarbon environment and begins the process of swelling and dissolution in the space above the insertion point of the solvent, i.e.
The increase of the ratio of height to diameter in the zone of sludge above 2 does not lead to further decline in water quantity and calcium stearate in a polymer solution.When submitting withdrawn from the top of the device circulating a solution of butyl rubber in a single point in the lower part of the zone of dissolution increases the amount of undissolved polymer and calcium stearate in a ready solution.
The method optionally includes a step (d) for concentrating latex to obtain artificial latex with high content of dry substances.
As initiator, 1% solution of azo-bis-isobutyronitrile is used and, as stabilizer, 4,4'-isopropylidenediphenol epoxide resin.
The frozen carrier is removed by sublimation at pressure below atmospheric pressure to obtain dry fluoropolymer particles, which are modified by presence of PTFE modifier in powder form.
The second liquid phase contains at least 90 wt % hydrocarbon rubber in terms of total weight of hydrocarbon rubber in the polymer suspension.
The first suspension is passed through a filter to obtain a second suspension with separation of polymer particles from monomers and diluent, where the first suspension flows at a tangent to the surface of the filter. When submitting withdrawn from the top of the device circulating a solution of butyl rubber in a single point in the lower part of the mixing zone increases the amount of water in the solution and you fall Mooney viscosity of the polymer. Polymer particles are separated and monomers and diluent of the second suspension are returned to the process. Water, having a specific gravity higher than the specific gravity of the polymer solution in a hydrocarbon solvent, settles in the lower part of the apparatus in the area of sludge (in), and is output from the apparatus on the line 3. The best is the flow of the circulating solution in two points, one of which is located in the lower part of the zone of dissolution, and the other in the lower part of the mixing zone. The solution of the base polymer of the upper part of the device along line 4 circulating pump 5 through line 6 and 7 back in the dissolution apparatus.

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