(57) Abstract:The invention relates to a cable technique, namely, halogen-free polymer composition for insulation and sheath of cables. The composition comprises, in wt.%: The alumina trihydrate 50-70, phenol-formaldehyde Novolac resin 1-4, zinc borate 2-5, polyethylene wax 2-5, Polybond 2-5, Irganox 1330 0.05 To 2, Irganox MD 1024 0.1 to 0.5, a copolymer of ethylene with vinyl acetate - rest. The technical result is an improvement of the mechanical characteristics and resistance to the action of copper ions. table 2. The invention relates to the field of electrical engineering, namely, cable technology, and can be used for the manufacture of insulation and sheath of different types of cables with low Flammability, particularly insulation and sheath power, control, signal block and optical cables.Currently used in cables with low Flammability PVC insulation (sheath) has satisfactory mechanical and dielectric characteristics, but has the significant disadvantage that in the event of fire out of it toxic, corrosive gases, resulting in the poisoning of people, is associated with the presence in the composition of the PVC halogen - chlorine.To eliminate this drawback has developed a number of insulating materials that do not contain Halogens. Such materials are compositions based on polyolefins and their copolymers containing as flame retardants, inorganic fillers. Known composition based on a copolymer of ethylene and vinyl acetate containing as flame alumina trihydrate (U.S. patent No. 3832326, CL 260-42.29, 1974). This composition during combustion does not emit corrosive and toxic gases, but it does not meet the Flammability requirements of UL standard 94 to the materials of the class 94V-0. In addition, isolation of the specified composition is not sufficiently resistant to thermal-oxidative aging in contact with a copper core or screen.The closest of those known to offer the technical essence is electrically insulating composition containing (wt.%): a copolymer of ethylene with vinyl acetate 28,5-50 and a filler composed of a mixture 1:1 of the three-hydrate of aluminum oxide and zinc borate - rest (U.S. patent No. 4575184, CL 350/96.23, 1986).The disadvantage of this composition are low mechanical characteristics (tensile strength). In addition the task consisted in the development of electrical insulating composition, do not emit combustion corrosive and toxic gases, which combines high mechanical characteristics and resistance with improved resistance to thermal-oxidative aging when exposed to copper ion.The technical result is achieved in that the insulating composition comprising a copolymer of ethylene with vinyl acetate, trihydrate alumina - Al(Oh)3, zinc borate, further comprises a Novolac phenol-formaldehyde resin, a polyethylene wax or a polyethylene wax modified with vinyl acetate, high density polyethylene, modified maleic anhydride - Polybond 3009, 1,3,5-trimethyl-2,4,6-Tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene - Irganox 1330 and benzoylpropionic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-,2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]hydrazide - Irganox MD1024 in the following ratio, wt.%:The alumina trihydrate 50-70Phenol - Novolac resin 1-4The zinc borate 2-5Polyethylene waxor polyethylene waxmodified with vinyl acetate 2-5High-density polyethylene,ptx2">4-hydroxybenzyl)benzene - Irganox1330 0,05-0,2benzoylpropionic acid3,5-bis(1,1-dimethylethyl)-4-hydroxy-,2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]hydrazide -Irganox MD 1024 0,1-0,5A copolymer of ethylene withthe vinyl acetate ElseThe proposed composition comprises known components.Used a copolymer obtained by copolymerization of ethylene with vinyl acetate Copolymer of ethylene and vinyl acetate is produced by the domestic industry (THE 6-05-1636-97).The zinc borate is produced GUP “Unichem WITH OZ” on THE 113-07-015-91.Polyethylene wax is produced by the firm "Clariant", Germany alumina Trihydrate produced by firm "Martinswerk, Germany.Phenol-formaldehyde Novolac resin is produced by JSC “Carbolite”. Irganox 1330 and Irganox MD 1024 are made by the company Ciba, Switzerland.The composition according to the invention can be processed on standard equipment used for these purposes in cable production.The following example illustrates but does not limit the invention.Example:5 minutesFrom the obtained compositions are prepared standard samples for testing. The compositions 1-7 are given in table. 1.The compositions are tested for Flammability standard UL-94, resistance to copper by the method of THE 2243-052-05766563-98 and determine their strength and elongation at break according to GOST 11262. The results are given in table. 2.Test results shows that the proposed composition has high strength and elongation at break and resistance to the action of copper ions and these indicators exceeds the prototype.Insulating composition comprising a copolymer of ethylene with vinyl acetate, alumina trihydrate, zinc borate, characterized in that it further comprises a Novolac phenol-formaldehyde resin, a polyethylene wax or a polyethylene wax modified with vinyl acetate, high density polyethylene, modified maleic anhydride - Polybond 3009, 1,3,5-trimethyl-2,4,6-Tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene - Irganox 1330 and benzoylpropionic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-,2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]hydrazide - Irganox MD 1024 when shadowselena resin 1-4The zinc borate 2-5Polyethylene waxor polyethylene wax, modifiedthe vinyl acetate 2-5High-density polyethylene,Modified maleicanhydride - Polybond 3009 2-51,3,5-Trimethyl-2,4,6-Tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene - Irganox 1330 0,05-0,2benzoylpropionic acid3,5-bis(1,1-dimethylethyl)-4-hydroxy-,2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]hydrazide -Irganox MD 1024 0,1-0,5A copolymer of ethylenewith vinyl acetate Else
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