Electroconductive peroxide cross-linkable composition

FIELD: electricity.

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.

2 tbl

 

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 acetate60-85
The aluminum hydroxide or magnesium130-170
High-density polyethylene,the
modified maleic anhydride15-35
Polyethylene wax0,1-5
Ester of 3,5-di-tert-butyl-4-hydroxy-phenylpropionate
acid and pentaerythritol - Irganox 1010 or
1,3,5-trimethyl-2,4,6-Tris(3,5-di-tert-butyl-4-
hydroxybenzyl)benzene - Irganox 13300,05-0,7
Benzodiapines acid 3,5-bis(1,1-dimethylethyl)-4-
hydroxy-2-[3-[3,5-bis(1,1-dimethoate)-4-hydroxyphenyl]the
-1-oxopropyl]hydrazide - Irganox MD 10240,05-0,3
Nanoglide10-20

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 vinyltriethoxysilane1,0-3,0
Organic peroxideof 0.1-0.4
Tetra-bis-methylene-(3-(3,5-di-tert-butyl-
-4-hydroxyphenyl)propionate 0,05-0,3
Benzodiapines acid 3,5-bis(1,1-
dimethylethyl)-
-4-hydroxy-2-[3-[3,5-bis(1,1-dimethylethyl)-4-
-hydroxyphenyl]-1-oxopropyl]hydrazide0,1-0,5
Poly-[[6-[(1,1,3,3-tetramethyl-4-
piperidinyl)imino]
-1,6-hexanediol[(2,2,6,6-tetramethyl-4-
piperidinyl)
imino]])0,1-5,0
The catalyst for the crosslinking0,05-1,0
The polyolefinrest

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.%:

The polyolefin49-62
Carbon black with a specific volume resistance
the content in the polymer ρ=10±6 Ohm*cm29-34
Carbon black with a specific volume resistance
the content in the polymer ρ=5±3 Ohm*cm2,5-5
4,4'-tubes(6-tert-butyl-m-cresol)0,05-0,25
Tetra-bis-methylene-(3-(3,5-di-tert-butyl-4-
hydroxyphenyl)propionate)0,05-0,20
Benzodiapines acid 3,5-bis(1,1-dimethylethyl)-4-hydroxy-
2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-
oxopropyl]hydrazide0,05-0,20
The zinc stearate0,15-1,0
Organic peroxideof 0.2 to 1.9
Polyethylene wax3-9

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.

5,18
Table 1
The compositions
Components, wt.%No. 1No. 2No. 3No. 4 (known)
The polyolefin50,454,46093,95
Technical carbon (ρ=10±6 Ω*cm)36,131,124,4-
Technical carbon (ρ=5±3 Ohm*cm)4,17,06-
4,4'-tubes(6-tert-butyl-m-cresol)0,090,130,13-
Tetra-bis-methylene-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate)0,070,060,060,1
benzodiapines acid 3,5-bis(1,1-dimethylethyl)-4-hydroxy-2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]hydrazide0,10,10,10,5
The zinc stearate0,240,260,25-
Polyethylene wax7,9to 7.777-
Organic peroxide1,01,01,02,0

Table 2
Properties of compositions
Name parametersNo. 1No. 2No. 3No. 4 (known)
Thermal deformation, %65255160
The tensile strength, MPa18,120,919,714,2
Elongation at break, %212276,6255,4650
Change in physical and mechanical properties after thermal aging at 135°C for 168 h, the tensile strength, %7,74,46,38
Change in physical and mechanical properties after thermal aging at 135°C for 168 h, the tensile strength, %5,12,54,412
surface Quality extrudable sample The surface is smooth, smoothThe surface is smooth, smoothThe surface is smooth, smoothThe surface is smooth, smooth
The specific volume resistivity at 20°C (required <100 Ohm*cm)6,9the 11.69,1≥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.%:

the polyolefin49-62
carbon black with a specific volume
resistance ρ=10±Ω·cm29-34
carbon black with a specific volume
resistance ρ=5±3 Ohm·cm2,5-5
4,4'-tubes(6-tert-butyl-m-cresol)0,05-0,25
Tetra-bis-methylene-(3-(3,5-di-tert-butyl-4-
hydroxyphenyl)propionate)0,05-0,20
benzodiapines acid 3,5-bis(1,1-dimethylethyl)-
4-hydroxy-2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-
1-oxopropyl]hydrazide0,05-0,20
the zinc stearate0,15-1,0
organic peroxideof 0.2 to 1.9
polyethylene wax3-9



 

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23 cl, 6 dwg, 3 tbl

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3 cl, 5 tbl

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1 cl, 2 tbl

FIELD: chemistry; insulation.

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EFFECT: obtaining of a new type of cable insulation.

43 cl, 9 dwg, 4 tbl, 10 ex

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