CN110111925B

CN110111925B - Low temperature resistant anti-cracking power cable

Info

Publication number: CN110111925B
Application number: CN201910412185.XA
Authority: CN
Inventors: 董吟梅; 陆秀国; 王友香; 杨茂明
Original assignee: Anhui Hui Ning Electrical Instrument Group Co ltd
Current assignee: Anhui Hui Ning Electrical Instrument Group Co ltd
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2020-08-11
Anticipated expiration: 2039-05-17
Also published as: CN110111925A

Abstract

The invention discloses a low-temperature-resistant anti-cracking power cable which comprises a rubber framework, wherein the rubber framework comprises a sawtooth-edge-shaped annular framework, a V-shaped plate is fixedly connected to each sawtooth concave angle on the outer side of the annular framework to form a plurality of quadrilateral cavities, a wire core I and two wire cores II are arranged inside the annular framework, the wire core I and the two wire cores II are stranded and then coated with a high-density polyethylene protective layer, wire cores III are respectively arranged in the quadrilateral cavities, and a glass fiber braided layer, a heat-insulating cotton layer, an aluminum tape interlocking armor layer and a styrene butadiene rubber outer sheath are sequentially coated on the outer side of the rubber framework. The sawtooth-edge-shaped annular framework has a good pressure-resistant buffering effect, can well protect the wire cores inside the framework, the V-shaped plates form a plurality of quadrilateral cavities to protect the wire cores inside the framework III, and has good compression-resistant, tensile-resistant and torsion-resistant effects, the internal structure of the cable is more compact and tidy, and the cable is twisted after long-time use and is not easy to deform.

Description

Low temperature resistant anti-cracking power cable

Technical Field

The invention relates to the technical field of cables, in particular to a low-temperature-resistant anti-cracking power cable.

Background

The power cable is used for transmitting and distributing electric energy, is commonly used for urban underground power grids, power station leading-out lines, power supply inside industrial and mining enterprises and power transmission lines under river-crossing seawater, and has a gradually increasing proportion in the power line. Power cables are cable products used in the trunk lines of power systems to transmit and distribute high power electrical energy, including various voltage classes, 1-500KV and above, and various insulated power cables.

However, the existing power cable has a lot of disadvantages, for example, the existing power cable does not have a good low temperature resistant effect, severe damage can be caused to the cable in cold weather, the existing power cable does not have a good anti-cracking function, and the cable can be cracked in different climates or after long-time use, so that the cable cannot work well, and the service life of the power cable is seriously reduced.

Disclosure of Invention

The invention aims to make up for the defects of the prior art and provides a low-temperature-resistant anti-cracking power cable.

The invention is realized by the following technical scheme:

the utility model provides a low temperature resistant anti-cracking power cable, including rubber skeleton, rubber skeleton including sawtooth edge form annular skeleton, constitute a plurality of quadrangle cavitys at every sawtooth nook closing member fixedly connected with V template in annular skeleton's the outside, be equipped with a sinle silk one and two sinle silks two in annular skeleton inside, sinle silk one including conductor one, the outside cladding of conductor one has crosslinked polyethylene insulating layer and tinned soft copper wire and dacron silk to weave insulating shield, with the one bunch of back cladding of three conductors having kevlar fibre weaving layer, sinle silk two including conductor two and in proper order the cladding in the polypropylene insulating layer and the almag silk of conductor two outsides weave the shielding layer, with the one bunch of back cladding of sinle silk and two sinle silks have high density polyethylene sheath a plurality of quadrangle cavitys in be equipped with sinle silk three respectively, sinle silk three including conductor three and the crosslinked ethylene tetrafluoroethylene copolymer cladding in the three outsides of conductor The insulating layer is characterized in that a glass fiber braided layer, a heat insulation cotton layer, an aluminum tape interlocking armor layer and a styrene butadiene rubber outer sheath are sequentially wrapped on the outer side of the rubber framework.

And a water-blocking aramid yarn filling layer is filled between the glass fiber weaving layer and the plurality of V-shaped plates.

The first conductor, the second conductor and the third conductor are all formed by twisting silver-plated copper wire bundles.

The styrene butadiene rubber outer sheath is composed of the following raw materials in parts by weight:

2-3 parts of diethylenetriamine, 150-170 parts of styrene-butadiene rubber, rd2-3 parts of anti-aging agent, 6-8 parts of glycidyl methacrylate, 0.7-1 part of benzotriazole, 8-10 parts of polyethylene wax, 0.1-0.2 part of butyltin trioctoate, 2-3 parts of ethylene glycol, 10-12 parts of sodium acrylate, 0.5-0.6 part of ammonium persulfate, 20-28 parts of montmorillonite and 1-2 parts of sulfur.

The preparation method of the styrene butadiene rubber outer sheath comprises the following steps:

(1) adding ammonium persulfate into deionized water with the weight 30-40 times of that of the ammonium persulfate, and uniformly stirring;

(2) calcining montmorillonite at 600-700 deg.C for 1-2 hr, cooling, grinding into fine powder, mixing with glycidyl methacrylate, adding into anhydrous ethanol 5-8 times of the weight of the mixture, stirring at 50-60 deg.C for 1-2 hr to obtain alcohol dispersion;

(3) adding sodium acrylate into deionized water with the weight 17-20 times of that of the sodium acrylate, uniformly stirring, feeding into a reaction kettle, mixing with the alcohol dispersion, uniformly stirring, introducing nitrogen, adjusting the temperature of the reaction kettle to 70-75 ℃, keeping the temperature and stirring for 3-4 hours, discharging, filtering, washing the precipitate with water, and drying at normal temperature to obtain modified soil powder;

(4) mixing polyethylene wax and an anti-aging agent rd, adding the mixture into dimethylformamide with the weight 3-6 times of that of the mixture, uniformly stirring, adding diethylenetriamine, raising the temperature to 130-;

(5) mixing the modified wax with modified soil powder, stirring for 1-2 hours at the temperature of 150-; adding triglycidyl isocyanurate, dibutyl phthalate, tetrabutylammonium bromide and allyl alcohol, mixing for 2-4 minutes, adding butyltin trioctoate and ethylene glycol, mixing to 95-100 ℃, discharging rubber, cooling to below 50 ℃, putting into an open mill, adding sulfur, and thinly passing for 3-5 times to obtain the styrene butadiene rubber outer sheath.

The invention has the advantages that:

according to the invention, the sawtooth edge-shaped annular framework is adopted, the V-shaped plates are fixedly connected to each sawtooth concave angle at the outer side of the annular framework to form a plurality of quadrilateral cavities, the sawtooth edge-shaped annular framework has a good pressure-resistant buffering effect and can well protect the wire cores in the sawtooth edge-shaped annular framework, the V-shaped plates form a plurality of quadrilateral cavities to protect the wire cores in the sawtooth edge-shaped annular framework, and the V-shaped plates have a good pressure-resistant, tensile and torsion-resistant effect, and the internal structure of the cable is more compact and tidy, is twisted after; the styrene butadiene rubber outer sheath has good wear-resisting, heat-resisting, ageing-resistant and vulcanization speed performance, and the outside of rubber skeleton cladding has glass fiber weaving layer, heat preservation cotton layer, aluminium strip interlocking armor and styrene butadiene rubber outer sheath in proper order, avoids the cable fracture, fine improvement power cable's life, it is effectual to prevent fires low temperature.

According to the invention, montmorillonite is pretreated by glycidyl methacrylate, then sodium polyacrylate is used for intercalation modification, polyethylene wax is treated by diethylenetriamine, and then the polyethylene wax is blended with the intercalation modified montmorillonite to promote epoxy crosslinking at high temperature, so that the dispersity of montmorillonite among polyethylene wax is improved, the compatibility of montmorillonite and a styrene-butadiene rubber matrix is further improved, the mechanical stability and strength of a finished composite material are improved, the protection effect on a cable is improved, and the crack resistance of a cable sheath is enhanced.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic diagram of a rubber skeleton structure.

Detailed Description

As shown in fig. 1 and 2, a low temperature resistant anti-cracking power cable comprises a rubber framework 1, wherein the rubber framework 1 comprises a sawtooth edge-shaped annular framework 2, a V-shaped plate 3 is fixedly connected to each sawtooth concave angle position on the outer side of the annular framework 2 to form a plurality of quadrilateral cavities, a wire core I and two wire cores II are arranged inside the annular framework 2, the wire core I comprises a conductor I4, the outer side of the conductor I4 is coated with a cross-linked polyethylene insulating layer 5, a tinned soft copper wire and polyester wire braided insulating shielding layer 6, three conductor I4 are stranded and then coated with a Kevlar fiber braided layer 7, the wire core II comprises a conductor II 8, a polypropylene insulating layer 9 and an aluminum magnesium alloy wire braided shielding layer 10 which are sequentially coated on the outer side of the conductor II 8, one wire core I and two wire cores are stranded and then coated with a high-density polyethylene protective layer 11, and a third wire core is arranged in each quadrilateral cavity and comprises a third conductor 12 and a crosslinked ethylene tetrafluoroethylene copolymer insulating layer 13 coated outside the third conductor 12, and a glass fiber braided layer 14, a heat-insulating cotton layer 15, an aluminum tape interlocking armor layer 16 and a styrene butadiene rubber outer sheath 17 are sequentially coated outside the rubber framework 1.

And a water-blocking aramid yarn filling layer 18 is filled between the glass fiber woven layer 14 and the plurality of V-shaped plates 3.

The first conductor 4, the second conductor 8 and the third conductor 12 are all formed by twisting silver-plated copper wire bundles.

the adhesive comprises 2 parts of diethylenetriamine, 150 parts of styrene-butadiene rubber, rd2 parts of an anti-aging agent, 6 parts of glycidyl methacrylate, 0.7 part of benzotriazole, 8 parts of polyethylene wax, 0.1 part of butyltin trioctoate, 2 parts of ethylene glycol, 10 parts of sodium acrylate, 0.5 part of ammonium persulfate, 20 parts of montmorillonite and 1 part of sulfur.

(1) adding ammonium persulfate into deionized water with the weight 30 times that of the ammonium persulfate, and uniformly stirring;

(2) calcining montmorillonite at 600 deg.C for 1 hr, cooling, grinding into fine powder, mixing with glycidyl methacrylate, adding into anhydrous ethanol 5-8 times of the weight of the mixture, stirring at 50 deg.C for 1 hr to obtain alcohol dispersion;

(3) adding sodium acrylate into deionized water 17 times of the weight of the sodium acrylate, uniformly stirring, feeding into a reaction kettle, mixing with the alcohol dispersion, uniformly stirring, introducing nitrogen, adjusting the temperature of the reaction kettle to 70 ℃, keeping the temperature and stirring for 3 hours, discharging, filtering, washing the precipitate with water, and drying at normal temperature to obtain modified soil powder;

(4) mixing polyethylene wax and an anti-aging agent rd, adding the mixture into dimethylformamide with the weight 3 times that of the mixture, uniformly stirring, adding diethylenetriamine, raising the temperature to 130 ℃, keeping the temperature and stirring for 60 minutes, removing the dimethylformamide by rotary evaporation, and drying at normal temperature to obtain modified wax;

(5) mixing the modified wax with modified soil powder, stirring for 1-2 hours at the temperature of 150-; adding triglycidyl isocyanurate, dibutyl phthalate, tetrabutylammonium bromide and allyl alcohol, mixing for 2 minutes, adding butyltin trioctoate and ethylene glycol, mixing to 95 ℃, discharging rubber, cooling to below 50 ℃, putting into an open mill, adding sulfur, and thinly passing for 3 times to obtain the styrene-butadiene rubber outer sheath.

Claims

1. The utility model provides a low temperature resistant anti-cracking power cable which characterized in that: the cable comprises a rubber framework, wherein the rubber framework comprises a sawtooth-edge-shaped annular framework, a V-shaped plate is fixedly connected at each sawtooth concave angle on the outer side of the annular framework to form a plurality of quadrilateral cavities, a cable core I and two cable cores II are arranged inside the annular framework, the cable core I comprises a conductor I, a cross-linked polyethylene insulating layer, a tinned soft copper wire and polyester wire braided insulating shielding layer are coated on the outer side of the conductor I, a Kevlar fiber braided layer is coated on the three conductors after one cable core is stranded, the cable core II comprises a conductor II, a polypropylene insulating layer and a polypropylene alloy wire braided shielding layer which are sequentially coated on the outer side of the conductor II, a high-density polyethylene protective layer is coated on the cable core I and the two cable cores after two cable cores are stranded, a cable core III is respectively arranged in the plurality of quadrilateral cavities, and the cable core III comprises a conductor III and a cross-linked ethylene tetrafluoroethylene copolymer insulating layer coated on the, the outer side of the rubber framework is sequentially coated with a glass fiber braided layer, a heat-insulating cotton layer, an aluminum tape interlocking armor layer and a styrene butadiene rubber outer sheath;

a water-blocking aramid yarn filling layer is filled between the glass fiber weaving layer and the plurality of V-shaped plates;

the first conductor, the second conductor and the third conductor are all formed by twisting silver-plated copper wire bundles;

2-3 parts of diethylenetriamine, 150-170 parts of styrene-butadiene rubber, rd2-3 parts of anti-aging agent, 6-8 parts of glycidyl methacrylate, 0.7-1 part of benzotriazole, 8-10 parts of polyethylene wax, 0.1-0.2 part of butyltin trioctoate, 2-3 parts of ethylene glycol, 10-12 parts of sodium acrylate, 0.5-0.6 part of ammonium persulfate, 20-28 parts of montmorillonite and 1-2 parts of sulfur;