Polymer composition for manufacturing electrohydroinsulating material
SUBSTANCE: invention relates to polymer composition for manufacturing sealing and electroinsulating materials for production of connection cable envelope. Composition contains low-pressure polyethylene, lubricant buxol as plasticiser and filling agent representing titanium oxide.
EFFECT: composition is characterised by high thermodynamic compatibility of components, which makes it possible to obtain material with high mechanical characteristics and optimal combination of electro- and hydroinsulating properties.
The invention relates to sealing and insulating materials for the production of sheath of communication cable, preferably an outer layer of the cable, performs a protective function in the manufacture of products for radio and electrical industry.
Known polymer waterproofing material made from waste - composition  using polyethylene obtained from waste material, with a density of not more than 0,940 g/cm3and polyethylene with a density of more 0,940 g/cm3the following composition, wt.%:
|the polyethylene obtained from waste|
|(density of not more than 0,940 g/cm3)||30-90|
|polyethylene (density more 0,940 g/cm3)||10-70|
The disadvantage of this composition is that used as the main component, the polyethylene obtained from waste, can give coatings with low mechanical properties such as ultimate tensile stress, elongation, resistance to cracking under the influence of environmental conditions compared to the original polymer materials. In addition, the aforementioned layers of the coating can the be degraded appearance mainly because of the formation of defects on their surface, for example, the formation of small agglomerates, which not only impair the appearance and violate the smoothness, but also reduce their mechanical characteristics.
The closest in composition to the inventive polymer composition is a polymer waterproofing material , including polyethylene, polyisobutylene, coal tar pitch and softening agent (a product of oxidation of bitumen with a boiling point 360-420°C) of the following composition, wt.%:
|coal high temperature tar pitch||30-35|
It is designed for sealing protection, so its composition is introduced fillers with waterproofing effectiveness. However, the binder is polyethylene with just 25%, so the strength characteristics it is very low. Another disadvantage of this composition is that its structure is unnecessarily complicated by a large number of fillers.
Object of the invention is the improvement of physico-mechanical, electrical, and waterproofing material properties, chemical resistance and compatible with the value of components based on cheap and available raw materials.
This object is achieved in that the polymer composition for the manufacture of sealing and insulating material contains low-pressure polyethylene, buccal as a plasticizer and a granular filler TiO2(titanium oxide) in the following ratio, wt.%:
|buccal as softener||4-8|
|granular filler TiO2(titanium oxide)||rest|
This material is characterized by high thermodynamic compatibility of the components of the composition, which allows you to generate high-quality samples with high mechanical characteristics.
For evaluation of the physico-mechanical properties of the material were prepared by five mixtures, composed of powder of polyethylene (PE) low pressure (20606-012, GOST 16338-70), bulk filler TiO2(titanium oxide) and plasticizer - developed rail lubrication buccal. The initial lubrication:
|Additive on the basis of nitrated oil (AKOR-1|
|Lithium soap of 12-hydroxystearic acid||8,0-12%|
|Lithium soap of oleic acid||5-3,0%|
|Dialkyldithiophosphate zinc (additive DF-11 and TU 24216-80)||4,0-8,0%|
|Oil oil (a mixture of industrial oils):|
|And-40 (GOST 2079988-97) made it THE 38.101413;|
|And a-50 (TU 38.101413-97);|
|spun oil AU (hydraulic|
|oil NN according to ISO 6743/4)||rest|
From each mixture was formed samples by hot pressing at a temperature of 150°C. the compositions of the samples are given in table.1, Physical and mechanical material properties of the claimed composition in comparison with the prototype are given in table.2.
|Track||Content, wt.%||Ultimate tensile strength, MPa||Water absorption, %||DK|
|PE||TiO2||proven rail lubrication buccal|
From table 1 it is seen that when the content of polyethylene in the amount of less than 81% of the strength characteristics of the material are greatly reduced and increases water absorption.
|The analyzed parameter||Method research equipment||Measurements||The conditions of the experiment|
|Known material||Proposed. material|
|Ultimate tensile strength, MPa||Breaking machine RMU-0.05 GOST 14236-81||4||20,0||At a constant strain rate of 50 mm/min|
|Water absorption, %||0,6-1,0||0,01||Extract in distilled water at 20°C for 7 days|
Thus, the optimum combination of power and waterproofing properties of the developed material is achieved when the content of polyethylene 82-86%, plasticizer 4-8% and oxide Titus is at rest.
In such compositions, the materials of the proposed compositions are superior to the known strength and water absorption. The ultimate tensile strength of a sample of known composition is not less than 4 MPa, whereas for samples of the proposed composition is 18.7-20.0 MPa, and the water absorption of the proposed composition is less than that of the prototype in more than 60 times.
Developed polymer composite material has a complex technological properties, allowing its processing on standard packaging equipment, good termosvarivaemaya and satisfactory mechanical characteristics. When the plant material can be used proven rail lubrication buccal.
In the generated material at the expense of part of the waste grease additives based nitrated oil AKOR-1, designed to improve protection (conservation) properties of mineral lubricating oils for various purposes and fuels, the principle of combining methods of protecting metal from corrosion as the result of combining both the functions of the barrier and cathodic protection.
Sources of information
1. Patent RU 2327714 cable with a coating layer made from waste / Castellani L., Felicioni A., Peruzzotti F., Albizzati E. (27.08.2008), IPC C08L 23/06, C09D 123/06, H01B 3/44, C08J 1/06, 2008.
2. Inventor's certificate SU 245357 A1 Polymeric material / Provincial I. C. (01.01.1969), IPC C08L 23/06, C08K 11/00, C08L 95/00, 1969, is the prototype.
Polymer composition for the manufacture of electrical insulation material containing polyethylene, plasticizer and filler TiO2, characterized in that the plasticizer contains a lubricant buccal in the following ratio, wt.%:
|buccal as softener||4-8|
|granular filler is titanium oxide||rest|
SUBSTANCE: power transmitting cable includes the following: at least one current conductor; insulating layer enveloping the above conductor so that at least one insulated conductor is formed; fire-resistant protective cover not containing halogen, located in radial external position relative to the above insulated conductor; the above cover has inner and outer layers which contact each other. Outer layer has thickness which is at least equal to thickness of the above outer layer. Inner layer includes polymer material having glass transition temperature equal to or less than -30°C. Outer layer includes polymer material resistant to drill fluid.
EFFECT: designing power transmitting cable with cover which is capable of resisting chemical attack and maintaining mechanical characteristics at very low temperatures.
23 cl, 2 dwg
FIELD: well drilling, particularly methods to drill orifices from predetermined area in existent well passing through underground reservoir carrying hydrocarbon fluid, and micro-drilling device.
SUBSTANCE: method involves moving drilling device provided with remote control and electric drive from ground surface along hydrocarbon fluid production pipe to selected area in existent well bore, wherein the pipe is sealed with respect to casing pipe wall; bringing drilling device in action so that cutting surfaces thereof may drill orifice from selected area of existent well to create drilling cuttings, wherein as drilling device operates the first produced fluid flow passes to ground surface through hydrocarbon fluid production pipe and the second produced fluid flow is injected over cutting surfaces of drilling device by means of downhole injection device provided with remote control and electric drive; conveying drilling cuttings entrained by the second produced fluid flow from drilling device. Assembly for said method realization comprises body having fluid channels, gripping device to be expanded in radial direction and having electric or hydraulic drive, as well as injection device having electric drive. Electric motor is adapted to activate drilling bit mounted on pushing device provided with electric or hydraulic drive. The drilling bit has cutting surfaces sized to create drilled orifice with diameter of 0.2-3 inches.
EFFECT: possibility to produce hydrocarbon fluid from existent well during orifice drilling from selected area.
35 cl, 5 dwg
FIELD: electrical communication components; cables whose conductors are covered with polymeric insulation extruded about conductor.
SUBSTANCE: proposed cable has its conductors covered with insulation that has at least one component incorporating maximum 20, and best of all 15, mass percent of polymer characterized in high degree of extrudate swelling. This polymer is defined as that characterized in extrudate swelling degree over 55% and higher, best of all that having extrudate swelling degree over 65%. Best insulation has at least second component of high degree of cracking resistance under stress; therefore, minimal combination of these polymers will provide for insulation layer possessing unique combination of physical properties, including high degree of foaming, fine uniform cellular structure, reduced attenuation, and cracking resistance under stress which is capable of sustaining temperature of 100 °C over 100 h without cracking in spirally coiled state at stress level one-fold higher than outer diameter of insulation.
EFFECT: improved electrical characteristics and mechanical strength of insulation.
23 cl, 6 dwg, 3 tbl
FIELD: electrical engineering.
SUBSTANCE: proposed metal wire or metal-core cable is enclosed in sintered insulation wound thereon in one or more layers with end sections being overlapped by polytetrafluoroethylene based non-sintered winding tape which is planoconvex in section; disposed between conductor 1 and insulation is polyamide winding tape 2 wound in one or more layers whose at least uppermost layer facing insulation is connected through force joint to layer facing conductor 1 that forms insulation of polytetrafluoroethylene based winding tape 3.
EFFECT: enhanced electric and mechanical strength.
9 cl, 1 dwg
FIELD: electrical and radio engineering.
SUBSTANCE: proposed high-voltage conductor designed for erecting dc and ac power transmission lines and also for use as conductor of heavy-power low-frequency radio transmitting antennas has concentrically disposed weight carrying member, radius R1 conductor, internal semiconductor insulating layer, external semiconductor insulating layer, and radius Re main insulating layer. Internal semiconductor insulating layer is required for fashioning current-carrying conductor in the form of round cylinder and for smoothing down irregularities capable of enhancing electric field strength and liable to cause partial discharges. External semiconductor insulating layer is used for fast equalization of potential throughout entire external surface of conductor. Operating voltage across conductor may exceed corona firing potential Vc in vicinity of insulator-air boundary by 1.4 to 3 times at specified corona power loss. Novelty is that relative radius x = Re/R1 and volume resistivity ρ of main insulating layer in high-voltage conductor with known corona-discharge current-voltage characteristic I(V1) and at specified corona power loss are interrelated by definite equations for frequencies f > fb and f < fb, where fb is value reverse to charge time constant of circuit set up of corona discharge resistance and total capacitance of system.
EFFECT: ability of conductor operation at voltage exceeding corona firing voltage near certain boundary.
2 cl, 6 dwg
FIELD: multiple twin cables for communications in local network.
SUBSTANCE: proposed multiple twin cable designed to prevent vapor transfer when immersed in petroleum oil has internal and external sheaths that cover insulated signal-transferring conductors and are made in the form of helical structure. Core filler fills up core and spaces between signal transferring conductors. Core filler and internal sheath are made of vapor-tight material and fixed to insulated conductors so that they fill up all grooves and slots around signal transferring conductors. External gas-tight sheath can be provided to make it possible to immerse cable in petroleum oil for long time intervals without impairing its functional capabilities.
EFFECT: ability of preventing vapor transfer lengthwise of cable.
26 cl, 4 dwg
FIELD: polymer materials.
SUBSTANCE: invention relates to novel liquid molding compositions comprising water-soluble or water-foaming polymer, which can be employed to improve water and moisture resistance as well as for waterproofing operation, for instance of waterproofing of cables. Composition contains water, water-soluble or water-foaming organic polymer obtained from monomer mixture containing 25 to 90 wt % of nonomer(s) selected from group including (meth)acrylamide and (meth)acrylic acid or salts thereof; 10 to 75 wt % of nonomer(s) selected from group including C8-C30-alkylethoxylated (meth)acrylamides, C8-C0-alkyl(meth)allyl ethers and C8-C30-alkylethoxylated (meth)allyl ethers; and water-miscible organic volatile liquid. Polymer is present in the form of discrete particles with average cross dimension below 10 μm. Invention further provides a method for improving water and moisture resistance of articles and/or preventing introduction of water into interior of article by way of contacting this article with above-indicated composition. Method of imparting waterproofing to outside or internal components of a cable comprises contacting at least one internal component with liquid molding composition. Invention allows preparation of composition capable of protecting fiber-optic cable.
EFFECT: enhanced waterproofing properties.
15 cl, 2 tbl, 11 ex
SUBSTANCE: electrically insulating composition consisting of suspension polyvinylchloride, ester and, when required, phosphate plasticiser, lead or calcium-zinc stabiliser, antioxidant, antimony oxide, zinc oxide, zinc borate, epoxidated vegetable oil comprises additionally sized aluminium hydrate or magnesium hydrate or their mixture, sized calcium carbonate, sized calcium-magnesium hydroxycarbonate and calcium-aluminium hydroxycarbonate at certain ratio of component.
EFFECT: reduced toxicity, corrosion activity and fume emission.
2 cl, 1 tbl, 1 ex
SUBSTANCE: invention is related to a cable for transportation and distribution of medium- and high-voltage energy. The cable (1) comprises at least one electrical conductor (2) and at least one electric insulating layer surrounding the above electrical conductor, at that this electric insulating layer (4) contains: (a) thermoplastic polymer material selected from at least one propylene copolymer (i) with at least one olefine comonomer selected from ethylene and α-olefin, not being propylene, at that the above copolymer has melting point higher or equal to 130°C and enthalpy of melting from 20 up to 90 J/g; mixture of at least one copolymer (i) with at least one ethylene copolymer (ii) with at least one α-olefin, at that the above copolymer (ii) has enthalpy of melting from 0 up to 70 J/g; mixture of at least one propylene homopolymer with at least one copolymer (i) or copolymer (ii); at that at least one of copolymer (i) and copolymer (ii) is a heterophase copolymer; (b) at least one dielectric liquid mixed thoroughly with thermoplastic polymer material, at that the above at least one dielectric liquid is aromatic dielectric liquid with the ratio of carbon aromatic atoms number towards the total number of carbon atoms is higher or equal to 0.3; (c) at least one voltage stabiliser selected from substituted bensophenones and hindered amines.
EFFECT: invention improves breakdown strength of the cable dielectric.
20 cl, 2 tbl, 1 dwg
SUBSTANCE: invention relates to polypropylene, a method for production thereof and a film capacitor made from said polypropylene. The polypropylene has a melting temperature (Tm) measured according to ISO 11357-3 of at least 151.0°C and xylene cold soluble fraction (XCS) of not more than 1.5 wt %. According to stepwise isothermal segregation technique (SIST) results, 45.0 to 67.0 wt % of the crystalline fraction has a lamella thickness in the range of 7.70 to 14.09 nm and 18.0 to 50.0 wt % of the crystalline fraction has a lamella thickness greater than 14.09 nm.
EFFECT: disclosed polypropylene has high heat resistance and enables to obtain biaxially oriented polypropylene (BOPP) and/or a film capacitor with high electrical breakdown strength and a high β parameter.
13 cl, 1 dwg, 9 tbl
SUBSTANCE: invention relates to a polyolefin composition with improved dielectric strength of insulation, to a wire or cable, in particular to a cable of middle, high or superhigh voltage, which includes such composition, as well as to application of such composition for production of wire or cable, in particular a cable of medium, high and superhigh voltage. Polyolefin composition contains polyolefin (A) and benzyl derivative (B) of a certain structure. Benzyl derivative (B) is used in the polyolefin composition as an additive for stabilisation of dielectric strength.
EFFECT: additive provides considerable improvement of dielectric strength, possesses good solubility in a polyolefin matrix and low predisposition to migration, and also possesses compatibility with respect to all other components of the polyolefin composition, in particular with cross-linking agents.
21 cl, 6 tbl, 5 ex
SUBSTANCE: electrically insulating composition contains suspended polyvinyl chloride, an ester plasticiser, a lead stabiliser, diphenylol propane, chalk, stearic acid, calcium stearate, epoxidated soya bean oil, magnesium hydroxide, ammonium polyphosphate, chlorinated paraffins, antimony trioxide, zinc oxide, boric acid and organoclay.
EFFECT: low level of smoke emission in burning and glowing conditions while maintaining the degree of incombustibility.
2 cl, 1 tbl
SUBSTANCE: electric insulating composition includes suspension polyvinyl chloride, ester plasticiser, diphenyl propane, lead stabiliser, stearic acid, lubricating material, epoxidated soya oil, chlorinated paraffin, magnesium hydroxide, ammonia polyphosphate and organic clay.
EFFECT: invention makes it possible to produce a composition with lower combustibility, low release of smoke and hydrogen chloride during combustion, and to increase value of physical and mechanical characteristics.
1 tbl, 6 ex
SUBSTANCE: electroconductive peroxide cross-linkable composition comprises, wt %: polyolefin 49-62, benzopropionic acid 3,5-bis(1,1-dimethylethyl)-4-hydroxy-2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl] hydrazide -0.05-0.20, tetra-bis-methylene-(3-(3,5-di-tret-butyl-4-hydroxyphenyl) propionate)-0.05-0.20, organic peroxide-0.2-1.9, electroconductive technical carbon with specific volume resistance p=10±6 Ohm*cm - 29-34, technical carbon with specific volume resistance p=5±3 Ohm*cm - 2.5-5, 4,4'-thiabis(6-tret-butyl-m-cresol) - 0.05-0.25, zinc stearate - 0.15-1.0, polyethylene wax - 3-9. The composition of the specified compound is not exposed to substantial thermal-oxidative ageing and premature cross-linking during superimposition, and items from it have smooth surface.
EFFECT: improved physical and mechanical properties of cable products made with application of the proposed composition, and its manufacturability and stability.
SUBSTANCE: invention relates to electrical engineering, specifically to cable engineering and polymer compositions based on plasticised polyvinyl chloride (PVC) with low inflammability, release of smoke and hydrogen chloride during combustion, intended for insulating inner and outer sheaths of cables. The electrically insulating composition contains suspended polyvinyl chloride, an ester plasticiser - dioctyl phthalate, tricresyl phosphate, chalk, soot, a stabiliser - melanine, antipyrenes - magnesium hydroxide and ammonium polyphosphate, smoke absorber - chlorinated paraffins, lubricant agent - calcium stearate, antioxidant - diphenylol propane and filler - organoclay, which is a product of modifying montmorillonite from the Gerpegezh deposit of the Kabardino-Balkaria Republic with cation-exchange capacity of 95 mg-eq/100 g clay with urea, in amount of 10% of the mass of montmorillonite.
EFFECT: obtaining a composition characterised by high non-flammability and low release of smoke during combustion.
SUBSTANCE: invention relates to cable engineering and specifically to polymer compositions based on plasticised polyvinyl chloride (PVC) with low inflammability and release of smoke in combustion and smouldering conditions and release of hydrogen chloride during combustion, meant for insulating inner and outer sheaths of wires and cables used in high fire hazard conditions. The electrically insulating composition contains suspension polyvinyl chloride, an ester plasticiser, a lead stabiliser, calcium carbonate, a trihydrate of aluminium oxide or magnesium hydroxide, antimony trioxide, calcium stearate, zinc oxide, zinc borate, a bromine-containing fire retardant, boric acid and diphenylol propane.
EFFECT: invention improves fire safety of wires and cables, reduces smoke-formation during smouldering or combustion and provides low inflammability.
1 tbl, 15 ex
SUBSTANCE: invention relates to a heterophase polypropylene resin, a method of producing such a polypropylene resin and use thereof in making articles, particularly as material for making insulation and semiconductor layers of power cables. The heterophase polypropylene resin contains a matrix phase of a propylene radom copolymer and a rubber phase of an ethylene-propylene copolymer dispersed in the matrix phase. The heterophase polypropylene resin is characterised by melt flow rate (2.16 kg, 230°C) from 1.0 to 100 g/10 min, determined according to ISO 1133, and a fraction which is soluble in p-xylene at 25°C (XCS fraction), which is present in the resin in amount of 28 to 50 wt % and has molecular weight distribution (Mw/Mn) from 1.0 to 4.0.
EFFECT: heterophase polypropylene resin has high softness, improved low-temperature impact characteristics and a high melting point.
14 cl, 3 tbl, 6 ex
SUBSTANCE: invention relates to polyethylene composition, intended for obtaining slow-burning construction materials of general technical and engineering-technical purpose. Composition contains high-density polyethylene and filling agent with particle size 0.145-0.315 mm in quantity 30-50 wt. p. per 100 wt. p. of polyethylene. Filling agent represents mixture of crushed basalt and crushed basalt wool.
EFFECT: obtained compositions possess increased output of coke residue at 600°C, Vicat softening temperature, temperature of destruction starting, toughness, bending strength, as well as high weight loss during combustion.
1 tbl, 5 ex