Process for continuous production of halogen-free thermoplastic elastomer compositions

FIELD: chemistry.

SUBSTANCE: invention relates to thermoplastic elastomer compositions and methods for continuous production of said compositions. continuous method for production of dynamically cured thermoplastic elastomer comprises mixing at first stage of a mixing device of continuous action a thermoplastic resin, a halogen-free elastomer, with polyolefin content of more than 3.5 mol%, which is modified with unsaturated carboxyl compound, and a curing agent. At second stage a curing system is added, which is suitable for use with halogen-free elastomer for dynamic vulcanisation.

EFFECT: invention enables to obtain materials with improved relative elongation at break and ultimate tensile strength.

15 cl, 2 tbl

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to thermoplastic elastomeric compositions. A dynamically vulcanisable alloy includes: a) at least one elastomer containing isobutylene; b) at least one thermoplastic resin, c) an anhydride-functionalised oligomer, wherein before functionalisation, the oligomer has molecular weight in the range of 750-1250, and d) a plasticiser which is selected from a group which includes tertiary amines, secondary diamines and sulphonamides, wherein the anhydride-functionalised oligomer and plasticiser are present in a ratio of 0.15-3.0, the elastomer is present in a dispersed phase in the form of fine vulcanised or partially vulcanised particles in the continuous phase of the thermoplastic resin.

EFFECT: alloy retains high Shore hardness A and acquires improved fluidity necessary for treatment.

12 cl, 4 tbl

Friction drive belt // 2551693

FIELD: machine building.

SUBSTANCE: invention relates to machine building and can be used in transmission gears. A belt for friction gears (10) comprises a glue part (12) of rubber and a compressive part (14) of rubber which is set lower than the glue rubber part (12). A cord (11) being an element for belt tension, is built-in in the glue rubber part (12). The glue rubber part (12) is fitted by an upper layer (12A) making up the upper side, and by a lower layer (12B) making up the lower side which is located around the cord (11). The upper layer (12A) and the lower layer (12B) are produced at the vulcanization of rubber mix containing high-viscous elastomer, for example, EPM or EPDM, and low-viscous elastomer with the Mooney viscosity of the latter being less than that of the high-viscous elastomer, and containing modified polyamide microfibers in the capacity of short fibres (21A, 21B) respectively. The short fibres (21A, 21B) are oriented in the width direction and longitudinal direction of the belt respectively.

EFFECT: better durability of a belt.

15 cl, 3 dwg, 3 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to application of moulded component for contact with supercritical medium. Moulded component represents sleeve or tube and contains inner thermoplastic layer made of moulding mass. Moulding mass contains at least 50 wt % of components, wt. p.: a) from 0 to 99 of polyamide, obtained from combination of diamine and dicarboxylic acid, as well as ω-aminocarboxylic acid and respective lactam and b) from 1 to 100 of polyamide elastomer, selected from the group, including polyether/polyester-amide and polyetheramide, with the sum of weight parts of components a) and b) constituting 100. Moulding mass contains additional components, including minimum to 9 wt % of plasticiser.

EFFECT: absence or small content of plasticiser makes it possible to nearly completely eliminate increase of rigidity and longitudinal product shrinkage.

13 cl

FIELD: chemistry.

SUBSTANCE: invention relates to thermoplastic moulding compounds. Described are thermoplastic moulding compounds, comprising: A) 10 to 98 wt % of a polyamide; B) 0.001 to 20 wt % of iron powder with particle size of at most 10 mcm (d50 value) and with a specific BET surface area of 0.1 to 5 m2/g according to DIN ISO 9277; C) 1 to 40 wt % of a halogen-free flame retardant from a group of the phosphorus- or nitrogen-containing compounds or P-N condensates, or a mixture thereof; and D) 0 to 70 wt % of other additives, where the total of the percentages by weight of components A) to D) is equal to 100%. The invention also describes use of said thermoplastic moulding compounds in making fibres, films and moulded articles, and fibres, films and moulded articles made from the thermoplastic moulding compounds.

EFFECT: providing thermoplastic polyamide moulding compounds, having improved heat aging resistance and good surface quality after heat aging, as well as mechanical properties.

10 cl, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to phosphorus-containing fire retardants, particularly, but not exclusively, for glass-filled polyamide resins. A fire-resistant polymer composition contains a main polymer (A), where the main polymer (A) includes a glass-filled polyamide, and a benzyl-substituted organophosphorus compound (B). The organophosphorus compound (B) is present in amount of about 10 wt % to about 30 wt % with respect to the amount of the fire-resistant polymer composition.

EFFECT: said organophosphorus compounds, especially if coupled with specific synergists, are effective fire retardants for thermoplastic polymers, including polyamides, especially glass-filled polyamides.

14 cl, 4 tbl, 10 ex

FIELD: process engineering.

SUBSTANCE: invention relates to dynamically cure mixes that can be used for tire production. Production of said mix including at least one isobutylene-bearing elastomer and at least one thermosetting resin is carried out in several steps. At step (a) said thermosetting resin is mixed with at least one plasticiser in the first melt processing device to get a resinous mother mix. At step (b) said mix is pelletised prior to feeding it in the melt treatment second device intake. At step (c) said elastomer, at least one curing agent and resinous mother mix are fed into intake of the melt second treatment device. At step (d) said content of melt processing second device under conditions of dynamic curing to make dynamically vulcanised mix. In the latter, elastomer exists as a disperse phase of fine cured or partially cured particles in disperse phase of thermosetting resin.

EFFECT: good impermeability and resilience at low temperatures.

17 cl, 2 dwg, 4 tbl

Transparent films // 2528728

FIELD: chemistry.

SUBSTANCE: group of inventions relates to an optically transparent polymer product, such as a film or a three-dimensional extrudate, made from a polymer composition and a method for production and use thereof. The optically transparent polymer product, such as a film or a three-dimensional extrudate, is obtained from a polymer composition containing a semi-crystalline polyamide (A) wherein the semi-crystalline polyamide (A) has a melting temperature (Tm-A) of at least 270°C and is present in an amount of at least 60 wt % if the semi-crystalline polyamide (A) consists of a semi-aromatic semi-crystalline polyamide or a mixture of a semi-aromatic semi-crystalline polyamide and an aliphatic semi-crystalline polyamide, or at least 75 wt % if the semi-crystalline polyamide (A) consists of an aliphatic semi-crystalline polyamide, where the wt % is relative to the total weight of the polymer composition. The polymer composition has a melting point (Tm-C) of at least 270°C, and the film or part of the extrudate is characterised by haze of less than 12% and light transmittance of at least 88%, measured with the method according to ASTM D1003A. The method of producing a transparent polymer film includes steps of heating and melt-extruding a polymer composition through a slit die to form an extruded polymer layer, passing the extruded polymer layer over a chilling roll having a temperature below 40°C, thereby forming a polymer film, and collecting the polymer film. According to the after-treatment method, the transparent polymer film is subjected to drawing wherein the film is stretched, and/or heat setting and/or annealing, wherein transparent polymer film, having a glass transition point (Tg) and a melting point (Tm), is heated to or kept for a certain period at a temperature between the Tg and Tm. The method of producing the extrudate includes steps of: melt-extruding a polymer composition through a die, passing the extruded polymer composition through a quenching liquid having a temperature below 40°C, thereby forming a solid product, and collecting the solid product. According to another version of the group of inventions, a steam-sterilisable medical article comprising an extrudate is disclosed. According to yet another version, the transparent polymer product is used in packaging materials or in electrical engineering or electronics.

EFFECT: improved mechanical properties of the transparent polymer film and extrudate product, maintaining the required mechanical properties at high temperatures, stability of geometric dimensions with limited thermal expansion and/or high deformation temperatures, and improved barrier properties.

15 cl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to mechanical engineering and particularly to a polyamide-based composite polymer antifriction material used to make articles for different tribological purposes, e.g. friction bearings, and for making articles for the braking system of rail passenger or cargo transport. The polyamide-based composite polymer antifriction material contains fibre filler in the form of carbon fibre or a mixture of carbon fibre and glass fibre. The composite polymer antifriction material further contains randomly arranged carbon nanotubes in form of single-layer or multilayer, with 2-70 layers, or interleaved, rolled graphite planes with 2-70 layers. The external diameter of the carbon nanotubes ranges from 0.1 to 100 nm and their length ranges from 1 to 70 mcm. The polyamide of the base of the composite polymer antifriction material used is polyamide 6 or Caprolon V or Ertalon. Content of glass fibre in the mixture thereof with carbon fibre of the fibre filler of the composite polymer antifriction material ranges from 3.48 to 10.5 wt %, with the following quantitative content of components, wt %: carbon fibre or mixture of carbon fibre and glass fibre 9.7-42.4, carbon nanotubes 0.05-0.55, polyamide - the balance. The carbon fibre in the composite material is carbon fibre made from high-molecular weight hydrated cellulose fibre or from polyacrylonitrile fibre. The carbon fibre of the composite polymer antifriction material is used in form of bundles or chopped bundles or chopped tape, and the glass fibre is used in form of chopped threads. The length of the chopped bundles or tape of the carbon fibre and chopped threads of the glass fibre ranges from 1 mm to 48 mm. The technical result is longer service life of articles made from the disclosed polyamide-based composite polymer antifriction material, low intensity of linear wearing in case of friction on a polished steel pair made of steel 40X.

EFFECT: high stability of friction coefficient on counter-body material made of steel 40X, high stress at break, maintaining Charpy impact strength on samples without dent while maintaining a given ultimate compression strength and low friction coefficient.

3 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: composition contains 45-95 wt % semi-aromatic copolyamide and 5-55 wt % of at least one cross-linked polyolefin. The semi-aromatic polyamide contains at least two different links having the general formula: A/X.T, where A is selected from a link obtained from amino acid, a link obtained from lactam and a link having the formula (diamine in Ca) (diacid in Cb), and X.T denotes a link obtained by polycondensation of diamine in Cx and terephthalic acid, where x is the number of carbon atoms of the diamine in Cx. Said copolyamide has polydispersity Ip, measured by gel-penetrating chromatography, of less than or equal to 3.5 and content of terminal amine groups of the chain between 0.020 and 0.058 meq/g.

EFFECT: invention enables to obtain a composition which is easy to produce and process, while preserving high temperature resistance.

25 cl, 5 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a composition based on a thermoplastic elastomer for use in articles as a barrier layer for fluid media, suitable for use in industrial articles such as inner layers of car tyres and hoses and a method of producing said composition. The composition contains dispersed particles of at least a first elastomer and not more than 20 wt% dispersed particles of at least a second elastomer. The first elastomer includes a halogenated, isobutylene-containing elastomer and the second elastomer has glass transition point lower than -30°C and contains at least one functional group capable of reacting and grafting to a thermoplastic resin with a functional group selected from a group consisting of maleic anhydride, acyl lactam, which reacts with amine functional groups contained in polyamides. Particles of at least the first and at least the second elastomer are dispersed in a continuous phase of a thermoplastic resin having Young's modulus higher than 500 MPa and air permeability coefficient less than 60×10-12 cm3/cm2 s cm Nd (at 30°C). The composition or said at least first elastomer further contains at least one photochemical radiation-induced decomposition stabiliser. The composition is obtained by dynamic vulcanisation in a mixing extruder, a method of creating shearing of a polymer and elastomeric components at high temperature.

EFFECT: obtained composition remains thermoplastic, and articles made therefrom can be moulded by conventional moulding, extrusion or calendering.

20 cl, 2 dwg, 7 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a method of obtaining a water dispersion of a hybrid polymer, which includes a polymer of autoxidative structuring and an additive polymer. The invention additionally relates to the water dispersion of the hybrid polymer, obtained by the claimed method, its application for obtaining compositions for coating application, to compositions for the application of coatings, including the hybrid polymer dispersion as a binding agent. The method of obtaining the hybrid polymer water dispersion includes the hybrid polymer from the polymer of auotoxidative structuring and the additive polymer, where at the stage of the first polymerisation the first dispersion of the hybrid polymer is formed by binding polymerisation of vinyl monomers in the presence of the dispersed polymer of autoxidative structuring. The method is characterised by the fact that at the stage of secondary polymerisation centres of the secondary polymerisation emerge in the first dispersion of the hybrid polymer and polymerisation of the residual vinyl monomer from the stage of the first polymerisation takes place, with the centres of the secondary polymerisation being formed after, at least, 75% conversion of the vinyl monomers at the stage of the first polymerisation is achieved.

EFFECT: coatings have a good stability, good tack-free time and open time, non-stickiness of dust.

14 cl, 4 tbl, 9 ex

FIELD: chemistry.

SUBSTANCE: product contains the following in wt %: 1-50 modified hybrid resin based on natural fatty acids and 99-50 natural material selected from cellulose, wood, wood fibre, flax, hemp, starch and another natural fibre or combinations thereof. The product can contain 20-80 wt % thermoplastic, 30-70 wt % binder or natural adhesive. The hybrid resin is obtained via water-emulsion polymerisation of an acrylate monomer - butylacrylate, methyl methacrylate or butylacrylate, on an alkyde resin based on fatty acids in the presence of a radical initiator at 30-100°C. Fatty acids are selected from tall oil, suberin fatty acids, cutin fatty acids, vegetable oils and mixtures thereof. The composite product is obtained by mixing acrylate hybrid and natural material or combination thereof. Further, the product is moulded and hardened under heat at 120-200°C until a composite product of the given type is obtained.

EFFECT: invention enables to obtain composite plates with improved properties, good biodegradability and low toxicity; such properties of the plates are achieved by using modified hybrid resins in form of a stable aqueous emulsion as binding materials and compatibilisers.

22 cl, 1 tbl, 1 dwg, 9 ex

FIELD: chemistry.

SUBSTANCE: invention relates to composite products, particularly a composite panel containing hybrid resins based on natural acids, as well as a method of producing a composite product. The product contains the following in wt %: 1-50 modified hybrid resin based on natural fatty acids and 99-50 natural material selected from cellulose, wood, wood fibre, flax, hemp, starch and another natural fibre or combinations thereof. The product can optionally contain 20-80 thermoplastics, 30-70 binder or natural adhesive. The hybrid resin is obtained via condensation of a mixture of natural C12-C20 fatty acids modified with maleic acid or anhydride, and an alkyde resin based on fatty acids of tall oil, suberin fatty acids, cutin fatty acids, plant oil or mixtures thereof. Properties of the panel are achieved using modified hybrid resins in form of a stable aqueous emulsion as binding materials and compatibilisers.

EFFECT: invention enables to obtain composite panels with improved properties, specifically good biodegradability and low toxicity.

17 cl, 1 tbl, 27 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to a pneumatic object. Pneumatic object is described which is provided with an elastomeric layer which is impermeable for inflating gas, wherein said impermeable elastomeric layer contains at least one thermoplastic styrene elastomer with block polyisobutylene, characterised by that said impermeable elastomeric layer additionally contains plasticising oil in amount of more than 5 to less than 150 phr (weight parts per 100 parts elastomer) and polyphenylene ether (PPE), where the polyphenylene ether is selected from a group consisting of poly(2,6-dimethyl-1,4-phenyl ether), poly(2,6-dimethyl-co-2,3,6-trimethyl-1,4-phenyl ether), poly-(2,3,6-trimethyl-1,4-phenyl ether), poly(2,6-diethyl-1,4-phenyl ether), poly(2-methyl-6-ethyl-1,4-phenyl ether), poly(2-methyl-6-propyl-1,4-phenyl ether), poly(2,6-dipropyl-1,4-phenyl ether), poly(2-ethyl-6-propyl-1,4-phenyl ether), poly(2,6-dilauryl-1,4-phenyl ether), poly(2,6-diphenyl-1,4-phenyl ether), poly(2,6-dimethoxy-1,4-phenyl ether), poly(1,6-diethoxy-1,4-phenyl ether), poly(2-methoxy-6-ethoxy-1,4-phenyl ether), poly(2-ethyl-6-stearyloxy-1,4-phenyl ether), poly(2,6-dichloro-1,4-phenyl ether), poly(2-methyl-6-phenyl-1,4-phenyl ether), poly(2-ethoxy-1,4-phenyl ether), poly(2-chloro-1,4-phenyl ether), poly(2,6-dibromo-1,4-phenyl ether), poly(3-bromo-2,6-dimethyl-1,4-phenyl ether), corresponding copolymers thereof and mixtures of said homopolymers or copolymers, and that the weight fraction of the polyphenyl ether ranges from more than 0.05 to less 5 times the weight fraction of styrene present in the thermoplastic styrene elastomer itself.

EFFECT: improved heat resistance and gas-impermeability of the gas-impermeable layer of the pneumatic object.

16 cl, 1 dwg, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to thermoplastic elastomeric compositions. A dynamically vulcanisable alloy includes: a) at least one elastomer containing isobutylene; b) at least one thermoplastic resin, c) an anhydride-functionalised oligomer, wherein before functionalisation, the oligomer has molecular weight in the range of 750-1250, and d) a plasticiser which is selected from a group which includes tertiary amines, secondary diamines and sulphonamides, wherein the anhydride-functionalised oligomer and plasticiser are present in a ratio of 0.15-3.0, the elastomer is present in a dispersed phase in the form of fine vulcanised or partially vulcanised particles in the continuous phase of the thermoplastic resin.

EFFECT: alloy retains high Shore hardness A and acquires improved fluidity necessary for treatment.

12 cl, 4 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a method of removing volatile compounds from a flowing medium, containing, at least, one non-volatile polymer, which represents synthetic rubber and, at least, one volatile compound, as well as to a device, suitable for the realisation of the said method. The method includes the following stages: a) processing the flowing medium in, at least, one unit of a concentrator, in which the flowing medium is heated, after which the concentrated flowing medium is supplied into a degassing tank and re-heating at stage b) in a reheating unit. After that, the reheated flowing medium is supplied to stage c) into, at least, one extruder unit. The extruder unit contains, at least, a degassing section of the extruder, from which volatile compounds are removed via ventilation ports and steam lines, as well as, at least, a transportation section, an accumulation section and a discharge section.

EFFECT: continuous energy-efficient, environmentally and economically preferable method of removing volatile compounds with obtaining a polymer product based on synthetic rubber, which virtually does not contain volatile compounds.

11 cl, 11 dwg, 10 tbl, 27 ex

FIELD: chemistry.

SUBSTANCE: non-drying rubber mixture contains, wt %: butyl-rubber regenerate from waste diaphragm chambers - 17.0-31.0, ether of glycerol tall oil rosin - 0.5-1.0, PN-6sh oil - 20.0-25.0, chalk - 10.0-45.0, high-pressure polyethylene in the form of a film - 0.5-1.3, waste fibres of cotton ginneries - 0.7-1.0, alumosilicate microspheres - 4.0-25.0, talc - 4.0-11.0.

EFFECT: invention makes it possible to increase the damping properties, adhesion to metal and frost resistance of the composition.

1 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to dynamically cure mixes that can be used for tire production. Production of said mix including at least one isobutylene-bearing elastomer and at least one thermosetting resin is carried out in several steps. At step (a) said thermosetting resin is mixed with at least one plasticiser in the first melt processing device to get a resinous mother mix. At step (b) said mix is pelletised prior to feeding it in the melt treatment second device intake. At step (c) said elastomer, at least one curing agent and resinous mother mix are fed into intake of the melt second treatment device. At step (d) said content of melt processing second device under conditions of dynamic curing to make dynamically vulcanised mix. In the latter, elastomer exists as a disperse phase of fine cured or partially cured particles in disperse phase of thermosetting resin.

EFFECT: good impermeability and resilience at low temperatures.

17 cl, 2 dwg, 4 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to butyl-rubber based elastomer material for a gas mask housing. The elastomer material contains sulphur as a vulcanisation agent, tetramethylthiuram disulphide (thiuram D) as a vulcanisation activator, zinc oxide as a vulcanisation accelerator, 2-mercaptobenzothiazole (captax) as a vulcanisation rate regulator, stearic acid as a plasticiser, as well as carbon as powdered filler, and is characterised by that it further contains polyisobutylene as a rubber mixture plasticising process additive, and as an antioxidant and stabiliser krafanyl-U, or acetonanyl-R (benzopyridine) of formula (C12H15N)n, or naphtham-2, or a mixture of acetonanyl-R with 18-28 pts.wt naphtham-2, or a mixture of krafanyl-U with 32-40 pts.wt acetonanyl-R (benzopyridine), with the following ratio of components per 100 pts.wt butyl rubber: said vulcanisation activator 1.3-1.7; said vulcanisation accelerator 4.4-5.6; said vulcanisation agent 1.8-2.5; vulcanisation rate regulator 0.3-1.1; said powdered filler 40-50; polyisobutylene 4.8-10.6; said plasticisiser 0.8-2.4; said antioxidant and stabiliser 0.9-2.0.

EFFECT: elastomer material which provides given elasticity and fitting of the shape of the head of a rescuer, maintaining a given shape of the gas mask housing, sufficient gas impermeability and reliable protection of human skin from aerosol and droplet penetration of liquid chemical and harmful substances.

5 cl, 15 ex

FIELD: chemistry.

SUBSTANCE: peroxide-cured thermoplastic vulcanisate contains thermoplastic and a non-halogenated elastomer. The thermoplastic is selected from a group comprising polypropylene, polyethylene, polystyrene, a copolymer of acrylonitrile, butadiene and styrene, allyl resins, a copolymer of ethylene and vinyl alcohol, fluoroplastic, polyacetals, polyacrylates, polyacrylonitriles, polyamides, polyimides, polycarbonates, polyesters, polethylene oxide, polypropylene oxide, polyethylene glycol, polypropylene glycol, polyvinylidene chloride and mixtures thereof. The non-halogenated elastomer contains repeating units obtained from isobutene and 3.5 mol % repeating units obtained from isoprene.

EFFECT: disclosed thermoplastic vulcanisates can be used when producing moulded articles for applications which require high degree of purity, reduced hygroscopicity and preventing decolouration of the article.

20 cl, 2 dwg, 7 tbl, 18 ex

FIELD: chemistry.

SUBSTANCE: described is a liquid graft polymer obtained using a method which involves reaction of a polymer of a C4-C7 monoolefin monomer and a C4-C14 multiolefin monomer which contains butyl rubber, in the presence of a material for conducting graft copolymerisation, which contains maleic anhydride, and a free-radical polymerisation initiator which contains an organic peroxide, wherein the liquid graft polymer has number-average molecular weight (Mn) from 150000 to 30000. Described is a vulcanised compound containing the described liquid graft polymer and a vulcanising agent based on a multi-functional amine. Described is a method of decomposing a non-liquid butyl polymer to a liquid butyl graft polymer, where the method involves reaction of a non-liquid butyl polymer of a C4-C7 monoolefin monomer and a C4-C14 multiolefin monomer which contains butyl rubber, in the presence of a material for conducting graft copolymerisation, which contains maleic anhydride, and a free-radical polymerisation initiator containing dicumyl peroxide, wherein the liquid graft polymer has number-average molecular weight (Mn) from 150000 to 30000.

EFFECT: liquid maleated butyl rubber is obtained.

16 cl, 2 tbl, 2 dwg, 10 ex

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