Electroconductive peroxide cross-linkable composition
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.
The invention relates to the field of electrical engineering, namely, cable technology, and can be used for screens of power cables medium voltage up to 35 kV.
The production of power cables medium voltage (6-35 kV) in recent years has tended to displace the cables with paper-impregnated insulation cables with polymeric insulation.
The design of these cables consist of three layers, superimposed on the conductive core - conductive polymer screen, polymer insulation and the second conductive polymer of the screen.
The presence of electrically conductive screen due to the necessity of establishing an equipotential surface, which is intended to substantially reduce the probability of breakdown of insulation in some region of space where the electric field intensity in the absence of such a screen could be prohibitive.
Known insulating composition (patent RF №2394292 "Insulating composition", publ. 10.07.2010)containing a copolymer of ethylene with vinyl acetate, aluminum hydroxide (Al(OH)3or magnesium Mg(OH)2, further comprises a high density polyethylene, modified maleic anhydride, polyethylene wax, nanoglide, ester 3,5-decret-butyl-4-hydroxy-phenylpropionic acid and pentaerythritol (Irganox 1010) or ,3,5-trimethyl-2,4,6-Tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene (Irganox 1330), benzo-propionic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-2-[3-[3,5-bis(1,1-dimethoate)-4-hydroxyphenyl]-1-oxopropyl]hydrazide (Irganox MD 1024) in the following ratio of components, parts by weight:
|A copolymer of ethylene with vinyl acetate||60-85|
|The aluminum hydroxide or magnesium||130-170|
|modified maleic anhydride||15-35|
|Ester of 3,5-di-tert-butyl-4-hydroxy-phenylpropionate|
|acid and pentaerythritol - Irganox 1010 or|
|hydroxybenzyl)benzene - Irganox 1330||0,05-0,7|
|Benzodiapines acid 3,5-bis(1,1-dimethylethyl)-4-|
|-1-oxopropyl]hydrazide - Irganox MD 1024||0,05-0,3|
A disadvantage of known composition is insufficient strength and relative elongation at break.
Known schivas insulating composition (patent RF №2440633 "Insulating schivas composition", publ. 20.01.2012), including polyolefin, VINYLTRIMETHOXYSILANE or vinyltriethoxysilane, organic peroxide and a crosslinking catalyst, contains synergists - Tetra-bis-methylene-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, benzo-propionic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-2-[3-[3,5-bis(1,1-dime-Titel)-4-hydroxyphenyl]-1-oxopropyl]hydrazide and poly-[[6-[(1,1,3,3-tetramethyl-4-piperidinyl)imino]-1,6-hexanediol[(2,2,6,6-tetramethyl-4-piperidinyl)imino]]) in the following ratio, wt.%:
|VINYLTRIMETHOXYSILANE or vinyltriethoxysilane||1,0-3,0|
|Organic peroxide||of 0.1-0.4|
|Benzodiapines acid 3,5-bis(1,1-|
|The catalyst for the crosslinking||0,05-1,0|
This polymer composition has insulating properties, then how to create an equipotential surface weak conductive properties. Tensile strength reaches values that are required for screens of medium voltage cables.
The disadvantages of the known slivaushiesia insulating composition, thus, is should be attributed not sufficiently high mechanical strength and cannot be used as the electrically conductive screen.
The task was to develop a conductive composition, peroxide crosslinking, which will improve the reliability of the electricity and reduce the cost of their maintenance and service during the transition to the medium voltage cables with XLPE insulation.
The polymer composition should be suitable for processing on existing production lines cable plants, possess high mechanical properties, be of sufficiently low electrical conductivity value of the specific volume resistance, to have a smooth surface, it should have good adhesion to other materials, not subject to significant thermal-oxidative aging and premature merging when applying. As the conductive filler should be used a material which will provide the optimum physical properties of the final composition. This filler must be commercially manufactured and inexpensive.
The technical result is achieved in that the electrically conductive peroxide-crosslinked polyethylene composition comprising a polyolefin, benzodiapines acid 3,5-bis(1,1-dimethylethyl)-4-hydroxy-2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]hydrazide, Tetra-bis-methylene-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), organic peroxide, further comprises electrop the conductive carbon black with a specific volume resistance when the content of the polymer ρ=10±6 Ω* cm, carbon black with a specific volume resistance when the content of the polymer ρ=5±3 Ohm*cm, 4,4'-tubes(6-tert-butyl-m-cresol), zinc stearate, polyethylene wax, wt.%:
|Carbon black with a specific volume resistance|
|the content in the polymer ρ=10±6 Ohm*cm||29-34|
|Carbon black with a specific volume resistance|
|the content in the polymer ρ=5±3 Ohm*cm||2,5-5|
|Benzodiapines acid 3,5-bis(1,1-dimethylethyl)-4-hydroxy-|
|The zinc stearate||0,15-1,0|
|Organic peroxide||of 0.2 to 1.9|
According to the invention, as a polymer base, you must use a polyolefin, such as ethylene vinyl acetate or polyethylene. Such polymers are produced by both Russian and foreign industry.
As the initiator of the stitching organic peroxide, some types of such compounds (e.g., peroxide of Dicumyl) issued by the Russian industry. The produced peroxide provide the necessary high and stable quality stitching material.
Used as filler carbon black provides two types of the polymer required is the specific volume resistance (<100 Ohm*cm at 23°C). It should be noted that the conductive properties of carbon black are determined with different content in the polymer. The first carbon black should provide specific volume resistance ρ=10±6 Ohm*cm at 35% of the content in the polymer, and the second with the same content - ρ=5±3 Ohm*see
Carbon black with such characteristics is produced by the domestic industry.
Stearate of zinc,used as a lubricating agent in the processing of the material, also produced Russian industry.
Polyethylene wax is produced in the CIS, is required as an external lubricant component.
These three types of antioxidants used to prevent unwanted chemical processes and the degradation of the material during production and processing, and for further use in the composition of the cables. Materials known and mass-produced by the chemical industry of the world.
The invention is illustrated by the following example.
|Components, wt.%||No. 1||No. 2||No. 3||No. 4 (known)|
|Technical carbon (ρ=10±6 Ω*cm)||36,1||31,1||24,4||-|
|Technical carbon (ρ=5±3 Ohm*cm)||4,1||7,06||-|
|benzodiapines acid 3,5-bis(1,1-dimethylethyl)-4-hydroxy-2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]hydrazide||0,1||0,1||0,1||0,5|
|The zinc stearate||0,24||0,26||0,25||-|
|Polyethylene wax||7,9||to 7.77||7||-|
|Properties of compositions|
|Name parameters||No. 1||No. 2||No. 3||No. 4 (known)|
|Thermal deformation, %||65||25||51||60|
|The tensile strength, MPa||18,1||20,9||19,7||14,2|
|Elongation at break, %||212||276,6||255,4||650|
|Change in physical and mechanical properties after thermal aging at 135°C for 168 h, the tensile strength, %||7,7||4,4||6,3||8|
|Change in physical and mechanical properties after thermal aging at 135°C for 168 h, the tensile strength, %||5,1||2,5||4,4||12|
|surface Quality extrudable sample||The surface is smooth, smooth||The surface is smooth, smooth||The surface is smooth, smooth||The surface is smooth, smooth|
|The specific volume resistivity at 20°C (required <100 Ohm*cm)||6,9||the 11.6||9,1||≥100 (insulator)|
Ranges specified content component should be considered as optimal. It is within these limits is reached the best quality of the composition from the viewpoint of physical properties, and from the point of view of their stability and reproducibility (see table No. 2).
We offer conductive peroxide-crosslinked polyethylene composition suitable for processing on existing production lines cable factories.
Conductive peroxide-crosslinked polyethylene composition in comparison with analogues has high mechanical properties and sufficient value specific volume resistance for weak conductivity screens cable, good adhesion to other materials, is not exposed to significant thermal-oxidative aging and premature merging when applying, and must have a smooth surface.
Proposed electroconductive what I peroxide-crosslinked polyethylene composition used as the conductive filler provide optimum physical properties of the final composition and is manufacturable and inexpensive.
In General, the proposed use of the conductive peroxidative compositions in the manufacture of medium voltage cables with XLPE insulation will significantly increase the reliability of the electricity, to reduce the cost of their maintenance and maintenance.
Conductive peroxide-crosslinked polyethylene composition comprising a polyolefin, benzodiapines acid 3,5-bis(1,1-dimethylethyl)-4-hydroxy-2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]hydrazide, Tetra-bis-methylene-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), organic peroxide, characterized in that it further comprises conductive carbon black with a specific volume resistance when the content of the polymer ρ=10±6 Ohms·cm, carbon black with a specific volume resistance when the content of the polymer ρ=5±3 Ohm·cm, 4,4'-tubes(6-tert-butyl-m-cresol), zinc stearate, polyethylene wax, with the following content, wt.%:
|carbon black with a specific volume|
|carbon black with a specific volume|
|resistance ρ=5±3 Ohm·cm||2,5-5|
|benzodiapines acid 3,5-bis(1,1-dimethylethyl)-|
|the zinc stearate||0,15-1,0|
|organic peroxide||of 0.2 to 1.9|
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: composition contains the following in pts.wt: suspended polyvinyl chloride 100, ester plasticiser 40-60, tribasic lead sulphate 3-7, calcium stearate 1-3, calcium carbonate 5-7, trihydrate of aluminium oxide and/or magnesium hydroxide 20-80, antimony trioxide 2-9, zinc oxide 1-5, ionol 0.1-0.5, zinc borate 0.5-6, diphenylol propane 0.1-0.5 percalite F 100 - 0-5 metal-containing lubricant 0.5-10, wherein the metal-containing lubricant is obtained by reacting oleic or stearic acid with glycerol in molar ratio 1:1 in the presence of 0.5-2.0 wt % of the total reaction mass of zinc oxide or magnesium oxide or two-component mixture thereof, with weight ratio thereof of 0.25-1.0:0.25-1.0 at 130-160°C and holding for 4-5 hours. High melt fluidity of the disclosed composition makes easier its processing in high-speed extruders.
EFFECT: low coefficient of smoke formation, high degree of incombustibility, processability of the composition and improved outer appearance of a bundle of the cable plastic compound.
1 tbl, 1 ex
FIELD: electrical engineering.
SUBSTANCE: method for production of insulated HV direct current (DC) eclectic cable or HV direct current (DC) eclectic cable or HV direct current (DC) lead or HV junction involves the stages of a polymer-based insulation system production (21), the system including a stirred polymer composition (12). Further thermal treatment (25) of the polymer-based insulation system is performed until the outside surface of the polymer-based insulation system is coated (24) with a coating impermeable for the substance present in the polymer-based insulation system as evenly distributed. Thus the concentration of the substance in the polymer-based insulation system is levelled.
EFFECT: manufacture time reduction, electric strength enhancement and maintenance simplification.
19 cl, 4 dwg
SUBSTANCE: invention relates to cable engineering and can be used for insulation and sheathing of cables and wires used in high fire hazard conditions. The electrically insulating composition contains a polyvinyl chloride composition I 40-13 A and a fire-retarding agent in form of montmorillonite which is modified with 5-15% urea or melamine, and magnesium hydroxide.
EFFECT: high fire-resistance of the composition and low smoke emission in the high fire hazard zone.
1 tbl, 6 ex
SUBSTANCE: electrically insulating composition contains I 40-13A PVC compound, an antipyrene in form of ammonium polyphosphate and organoclay which is a product of modifying montmorillonite with cation-exchange capacity of 95 mg-eq/100 g clay with melamine in amount of 10% of the mass of montmorillonite.
EFFECT: reduced inflammability, low smoke toxicity, low cost of plasticised polyvinyl chloride.
2 dwg, 1 tbl, 6 ex
SUBSTANCE: composition contains, in weight parts: interpolymer ethylene with vinyl acetate 25-30, polyethylene 5-10, combiner 3-5, magnesium hydroxide Mg(OH)2 25-30, calcium carbonate CaCO3 25-30, nanoclay 5-10, anti-oxidant 0.1-0.3.
EFFECT: increased strength and elongation at break, reduced combustibility and low toxicity due to absence of halogen compounds.
SUBSTANCE: electrically insulating cross-linking composition contains the following in wt %: vinyl trimethoxy silane or vinyl triethoxy silane 1.0-3.0; organic peroxide 0.1-0.4; tetra-bis-methylene-(3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate - 0.05-0.3; benzopropionic acid 3,5-bis(1,1-dimethylethyl)-4-hydroxy-2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl] hydrazide 0.1-0.5; poly-[[6-[(1,1,3,3-tetramethyl-4-piperdinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino)]] 0.1-5.0; cross-linking catalyst 0.05-1.0; polyolefin - the rest.
EFFECT: preventing premature cross-linking of the composition during processing and production, high wear resistance and thermal deformation characteristics.
SUBSTANCE: composition contains the following in pts.wt: suspended polyvinyl chloride 100, butadiene-nitrile rubber with 15-40 wt % content of acrylonitrile 10-30, magnesium hydroxide 20-40, ester plasticiser 20-40, lead stabiliser 3-7, antimony trioxide 3-10, zinc oxide 1.5-3, boric acid 0.8-1, Agidol 20.5-2.5, Irganox 1010 0.1-0.5, calcium stearate 0.5-1.5, stearic acid derivative selected from: ethylene glycol mono- and distearate, isooctyl stearate, ethylene amine distearate, 12-oxystearamide 0.5-4. The composition can additionally contain 0.5-3 pts.wt technical carbon.
EFFECT: improved physical and mechanical characteristics and swelling resistance in petroleum products while meeting requirements for the level of smoke formation in combustion and smouldering conditions and release of hydrogen chloride.
FIELD: insulating materials for telecommunication cables.
SUBSTANCE: polyolefin insulation of conductors in hydrocarbon lubricant filled telecommunication cable which is then placed in junction box operating in the open is susceptible in particular to adverse impact of heat, oxygen, and moisture. In order to ensure reliable functioning of these conductors under mentioned conditions, use can be made of combination of one or more primary phenolic antioxidants chosen from N,N'-hexane-1.6-diilbis-(3(3.5-di-tertiary-butyl-4-hydroxyphenylpropionamide)), tris(3.5-di-tertiary-butyl-4-hydroxybenzyl)isocyanin-rhata, and tris(2-(3.5-di-tertiary-butyl-4-hydroxyhydrocinnamoyloxy)-ethyl)isocyanourate together wit one or more alkyl hydroxyphenyl alkanoylhydrazine metal deactivators.
EFFECT: enhanced oxidation resistance of polyolefin insulation of conductors.
8 cl, 1 tbl, 1 ex
FIELD: cable industry.
SUBSTANCE: proposed composition designed for insulating and sheathing cables and wires meant for operation under high fire hazard conditions incorporates following ingredients, parts by weight: suspension polyvinyl chloride, 100; ester plasticizer, 30 - 70; tribasic lead sulfate, 2 - 6; calcium carbonate, 20 - 300; zinc oxide, 0.5 - 10; aluminum oxide trihydrate, 20 - 70; antimony trioxide, 3 - 8; zinc borate, 0.5 - 8; zinc stearate, 0.25 - 4. Zinc borate and stearate introduced in definite proportion into proposed composition have made it possible to improve fire-safety characteristics of the latter.
EFFECT: reduced emission of smoke and hydrogen chloride in burning, enhanced degree of inflammability.
1 cl, 1 tbl
FIELD: electrical engineering.
SUBSTANCE: proposed polymeric insulating composition given in description of invention together with description of cables and wires covered with such composition to ensure their excellent performance in service has 60 to 90 mass percent of copolymer A of ethylene and α-olefin produced by copolymerization with aid of concentric catalyst and 40 to 10 mass percent of polyolefin resin B other than copolymer A and includes polyolefin incorporating grafted substituents with dipole moment 4 D or higher. One of alternative compositions uses semiconducting composition as semiconductor layer. In particular cases ethylene and α-olefin copolymer is produced by polymerization with aid of Ziegler-Natta catalyst.
EFFECT: facilitated production.
8 cl, 2 tbl
FIELD: cable industry.
SUBSTANCE: proposed composition designed for insulating general industrial cable and wire sheaths to reduce fire occurrences due to inflammation of cables and wires has following ingredients, mass percent: polyvinyl chloride suspension, 100; ester plasticizer, 25 - 75; lead stabilizer, 1 - 7; calcium stearate, 0.7 - 3; diphenylolpropane, 0.1 - 0.8; zinc oxide, 0.5 - 8; zinc borate, 0.5 - 5; calcium chloride, 0.1 - 2 or calcium oxide, 0.1 - 2; calcium carbonate, 5 - 90; antimony trioxide, 0.5 - 9; and carbon black, 1 - 8.
EFFECT: reduced inflammability and smoke-forming capacity due to introduction of zinc oxide, zinc borate, and calcium chloride or calcium oxide.
3 cl, 1 tbl
FIELD: cable industry.
SUBSTANCE: proposed composition designed for insulating sheaths of cables and wires operating under high fire hazard conditions has following proportion of ingredients, part by mass: suspension polyvinyl chloride, 100; ester plasticizer, 35 - 65; lead stabilizer, 2 - 7; calcium carbonate, 5 - 45; aluminum oxide trihydrate, 20 - 100; antimony trioxide, 5 - 9; zinc oxide, 0.5 - 8; and newly introduced zinc borate, 0.5 - 8; calcium stearate, 1 - 3; calcium chloride, 0.1 - 2 or calcium oxide, 0.1 - 2.
EFFECT: enhanced fire resistance at low degree of smoke emission under fire conditions.
1 cl, 1 tbl
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: insulation materials.
SUBSTANCE: invention relates to polyethylene composition for insulation of conductors and cables, which exhibits improved scorching resistance and consists of (i) polyethylene and scorching inhibitor having melting point under atmospheric pressure below 50°C and being compound depicted by general formula I, wherein R1 represents optionally phenyl-substituted С1-С20-alkyl, С2-С20-alkenyl, С3-С20-alkynyl, С3-С9-cycloalkyl, phenyl, or tolyl; R2 and R3, independently from each other, represent С1-С20-alkyl optionally substituted by following substituents: phenyl, one or two hydroxyls, cyano group, formyl, acetyl, and -O-COR5; R5 represents С1-С20-alkyl, С2-С20-alkenyl, С3-С20-alkynyl, or optionally hydroxyl-substituted С3-С9-cycloalkyl; phenyl, 4-chlorophenyl, 2-methoxycarbonylphenyl, p-tolyl, 1,3-benzothiazol-2-yl, -(CHR6)nCOOR7, or -(CHR6)nCONR8R9, wherein n=1 or 2, R6 represents hydrogen atom or С1-С6-alkyl; R7 С1-С20-alkyl optionally interrupted with 1-5 O or S atoms, С5-С7-cycloalkyl, phenyl, benzyl, or tolyl; R8 and R9 each represents hydrogen atom or С1-С6-alkyl; R4 represents hydrogen atom or methyl; and (ii) organic peroxide. Composition may be extruded with minimum preliminary cross-linking, even at sufficient cross-linking rate. Polyethylene composition for insulation of conductors and cables with improved scorching resistance is described, which composition additionally contains an amine selected from group consisting of diphenylamine, 4-tert-butyldiphenylamine, 4-tert-octyldiphenylamine, 4,4'-di-tert-butyldiphenylamine, 2,4,4'-tris-tert-butyldiphenylamine, 4-tert-butyl-4'-tert-octyldiphenylamine, o,o', m,m'- or p,p'-di-tert-octyldiphenylamine, 2,4-di-tert-butyl-4'-tert-octyldiphenylamine, 4.4'-di-tert-octyldiphenylamine, 2,4-di-tert-octyl-4'-tert-butyldiphenylamine. This composition may be extruded with minimum preliminary cross-linking, even at sufficient cross-linking rate. Method for preparing cross-linked polyethylene composition is also disclosed. (I).
EFFECT: enhanced resistance against preliminary vulcanization at simultaneously preserved satisfactory vulcanization rate and density of cross linkages formed.
3 cl, 5 tbl
FIELD: electrical engineering; polymeric compositions based on reduced-inflammability plasticized polyvinyl chloride.
SUBSTANCE: proposed suspended polyvinyl chloride based polymeric composition designed for insulating internal and external sheaths of wires and cables has following ingredients, mass percent: suspended polyvinyl chloride, 100; ester plasticizer, 45-70; chlorinated wax and/or chlorinated alpha-olefins, 15-20; tribasic lead sulfate, 5-7; calcium stearate, 1-2; aluminum hydroxide or magnesium hydroxide, 45-60; antimony trioxide, 5-10; diphenyl propane, 0.1-0.5; 4.4'-isopropylidenediphenol epoxy resin, 23-4; carbon black, 0.5-2.0.
EFFECT: reduced inflammability, enhanced volume resistivity, thermal stability, and melt fluidity of composition.
2 cl, 1 tbl, 11 ex
FIELD: cable engineering.
SUBSTANCE: proposed smoke-emitting plasticized PVC based polymeric composition used for manufacturing insulation and cable sheaths has following ingredients, mass by part: suspension polyvinyl chloride, 100; ester plasticizer, 40-90; lead stabilizer, 2-8; antimony trioxide, 2-10; zinc oxide, 2-4; boron acid, 2-5; ocher, 10-70; calcium stearate, 1-3; diphenylolpropane, 0.1-0.4.
EFFECT: enhanced heat resistance of composition, its compliance with requirements to smoking under conditions of burning, smoldering, and hydrogen chloride emission in burning.
1 cl, 2 tbl
FIELD: chemistry; insulation.
SUBSTANCE: invention pertains to a cable with a coating layer, made from waste materials. The cable consists of at least, one conductor with at least one transfer element and at least one layer of coating. The coating material contains between 30 mass % and 90 mass % of the overal mass of the coating material, at least, first polyethylene with density not more than 0.940 g/cm3 and melt flow index from 0.05 g/10 min. to 2 g/10 min., measured at 190°C and a load of 2.16 kg in accordance with standard ASTM D1238-00, and quantity from 10 mass % to 70 mass % of the overall mass of the coating material, at least, second polyethylene with density of more than 0.940 g/cm3. The first polyethylene is obtained from waste material. Use of at least, one polyethylene with density of more than 0.940 g/cm3 in the recycled polyethylene allows for obtaining a layer of coating, capable of providing for mechanical characteristics, in particular, breaking stress and tensile strength, comparable to characteristics of primordial polyethylene. The stated coating layer is preferably used as an external protective coating.
EFFECT: obtaining of a new type of cable insulation.
43 cl, 9 dwg, 4 tbl, 10 ex