Cable protecting material

FIELD: production of protecting and corrosion-resistant materials by impregnating fibrous base with antiseptic and corrosion-resistant compounds.

SUBSTANCE: material is made in the form of low-twist yarn of flat section from bast-fiber or mixed filaments having linear density of 1,500-3,500 tex and twist rate of 20-50 per 1 m. Yarn is reinforced with high-strength thread consisting of synthetic filaments having linear density of 60-120 tex or bast-fiber filaments having linear density of 200-600 tex. Rupture load of reinforcing thread is 30-60% of rupture load of yarn. Material is also impregnated with compound including 12-28 wt% of liquid non-volatile or low-volatile low-viscosity petroleum products used as filler, 0.2-1.5 wt% of product of reaction of aromatic hydrocarbons with isobutylene as antiseptic.

EFFECT: increased workability and covering capacity, high fungi-resistance and strength, in particular, on usage of jute filament and Capron thread, and impregnation compound based on transformer oil and antiseptic.

5 cl, 1 tbl, 12 ex

 

The invention relates to the production of protective and anticorrosive materials obtained by impregnating cable yarn antiseptic and anti-corrosion compounds and are designed to protect cables.

In the outer cover of the armored electrical cables used material protective cable based stapulionis stekloprjazhi on THE 6-48-23-89, year of entry 1990.

The main characteristics of stekloprjazhi:

Linear density, Tex2900
Destructive force, kg, not less than14

For the characterization of linear density of yarn adopted conventional unit Tex determined in accordance with GOST 6611.1-73, commissioned in the year 1973, as the ratio of the mass of point samples of the yarn in grams to the length of this spot samples (50 m), multiplied by 1000.

The outer protective cover is produced by blending stekloprjazhi on the cable on top of the armor in a spiral continuous sleeve and impregnating it with bitumen.

Disadvantages of stekloprjazhi:

- low strength at sub-zero temperatures, at which stekloprjazhi and protective covers from her collapse, especially during storage of cable drums and laying on the route;

- weak adhesion between the coils and armor, which leads to the exposure armor cable;

- air pollution in PR the production room glass dust 2 hazard class according to GOST 12.1.007-76, commissioned in the year 1976, when applying stekloprjazhi on cable.

No biocorrosion compositions in stekloprjazhi leads to accelerated destruction of bitumen, part of the protective cover of the cable.

The closest adopted for the prototype, is the material of the protective cable based on the cable yarn according to OST 17-05-047-2001, commissioned in the year 2001, impregnated with lubricant according to GOST 15037-69, commissioned in the year 1970.

Cable yarn prototype is made of short bast fibres (flax, hemp, kenaf, jute, or a mixture thereof) by way of a short spinning and impregnated with an antiseptic solution (copper naphthenate) in viscous oil (mineral oil gelled solid hydrocarbons). The impregnation is carried out in the boilers when the temperature of the composition 120-130°C for 3-5 hours with extraction of excess composition on the centrifuge. The content of an impregnating composition of the yarn is not less than 35 mass%.

Main characteristics of the impregnated cable yarn prototype at a nominal linear density of 2900 Tex:

The breaking load, kg, not less than12
Twists per 1 m of yarn, not less than60

In cross-section yarn has a round profile.

The disadvantages of the prototype:

- reduced the opacity of the round yarn (the presence of bare and armor) and increased consumption in the protective coverings of cables (20-30% more than stekloprjazhi);

- increased corrosiveness of copper naphthenate contained in the yarn, with respect to aluminum or lead sheath and steel armor cable;

low adaptability to the imposition of a yarn in a protective covering of the cable, the presence of a brown oil spots and stains on the outer surface of the chalk paint cable (bad appearance of the cable) and insufficient adhesion between the coils of bitumen-impregnated yarn due to high content of oil.

An object of the invention is to develop a material of the protective cable fibrous internal (pillow) and the outer integument cable impregnated with antiseptic composition, is not inferior to the prototype of the strength and gribomont, but with a greater hiding power, protection metal sheath and armour of the cable from corrosion, a lower content of antiseptics and impregnating composition, high technology and good appearance of the cable, providing high-quality protective covers cable on its basis at a minimum cost of raw materials, energy, labour costs and no waste.

The technical result is achieved by the fact that, as the fibrous basis use malokroshechny yarn flat section with twists 20-50 1 meter and with a linear density of 1500-3500 Tex, manufactured the pour from the bast or mixed fibers, reinforced high-strength filament of synthetic fiber linear density 60-120 Tex or bast fibers with a linear density of 200 to 600 dtex, with a tenacity that is part of 30-60% of the breaking load of the yarn, impregnated with a composition comprising a liquid non-volatile or low volatile low viscosity oil and antiseptic - ASCM-1A - product of the interaction of aromatic hydrocarbons with isobutylene, in the following ratio, wt.%:

Liquid non-volatile or low volatile
low viscosity oil12-28
Antiseptic0,2-1,5
YarnRest

Common features of the prototype and the proposed technical solutions are: the presence of fibrous warp (yarn), soaked in an antiseptic solution in the oil.

At the same time, the proposed material is different from the known design of a fibrous base, reinforced with high-strength thread of synthetic or bast fibres, the use of non-volatile or low volatile low viscosity oil and a new antiseptic.

The advantages of the new material:

- increased hiding power and low consumption of yarn in the protective coverings of cables;

- high mechanical strength is;

- high performance and funginertness material;

- absence of corrosive activity;

- high quality impregnation with a low content of antiseptic and oil products;

- high technology;

minimal expenses for impregnation of the material with high performance;

- no waste;

- low cost;

- good appearance of the cable.

Yarn can be made from plant (flax, jute, hemp, kenaf, cotton and so on) or mixed (with the addition of synthetic) fibers.

Constraints on the choice of the composition of the fiber yarns for protective cable material impose mark and the destination of the cable, the operating conditions of the cable, the protective characteristics of the material strength and durability, propityvaet, cost, etc., technological parameters of manufacturing yarn and protective cover, and features a protective cover cable: thickness, strength, continuity of coverage, frost resistance, moisture resistance, biocontainment, adhesion to the metal sheath and armour etc.

For armoured cables all these requirements are met yarn of bast fibres: flax, jute, hemp, kenaf, or mixtures thereof, including synthetic fibers.

The use of other materials for cable yarn impairs its manufacturability and reduced the t quality protective covers cable.

Maximum quality of protective coverings of cables is achieved through the use of yarn of jute which has a sufficiently high porosity necessary for high-quality impregnation antiseptic composition, good adhesion to the metal cable sheath and armour, high specific strength, frost resistance, decay resistance, moisture resistance, durability and low cost.

The optimal linear density of the yarn is determined by the settings of the protective cover cable: thick cover, the number of layers of yarn, gauge, and yarn strength, yarn consumption per unit length of cable, as well as the technological possibilities of spinning machines and phraseological, and is 1500-3500 Tex.

Reduction of the linear density leads to an improvement in the quality of impregnation of the yarn, but this reduces the breaking load, leading to frequent breakages, and manufacturability. The increase in linear density of the yarn affects the quality of the impregnation, leads to excess yarn in a protective covering of the cable, the increase in the diameter and weight of cable.

The design of the new material was chosen from the condition of maximum opacity and strength of the yarn needed to improve quality protective covers, at its minimum flow rate per unit length of cable.

Were also taken into consideration when choosing the design p is age minimum shrinkage in thickness when it is wound on the cable and ease of manufacture, good appearance protective covers, no gaps in the protective cover. All these requirements are satisfied malagrotta yarn flat section with twists 20-50 1 meter. Reducing the number of turns leads to lower breaking load and breakages of the yarn during its production and application of cable reduction technology in the manufacture of yarn.

Increasing the number of turns reduces the opacity of the yarn, increase the flow of yarn and cable diameter, deterioration of the appearance of protective coverings of cables (the gaps between the turns of yarn, roughness).

The plane section of the yarn provides maximum coverage, minimum cable diameter and good appearance of the protective covers.

To save the breaking load of palacruceros yarn at the level of ordinary twisted cable yarn serves to reinforce the new yarn high tenacity yarn of synthetic fibres (polyester, polyamide, etc.) linear density 60-120 Tex or bast fibres (flax, jute, kenaf) linear density 200-800 Tex with a breaking load comprising 30-60% of the breaking load of the yarn.

Reduction of the linear density and breaking strength reinforcing filaments leads to reduction of the breaking load of the yarn and its breakages during manufacture and use.

The increase in linear density and razran the th load thread leads to an increase in the thickness of the yarn and its value.

As a reinforcing thread to the greatest degree (performance, cost) suitable high strength yarn of polyamide fibers.

As one of the components antiseptic impregnation composition is proposed to use a liquid non-volatile or low volatile low viscosity (unlike the prototype) petroleum products: low viscosity mineral oils, kerosene, diesel fuel, heating oil, etc.

Of oils can be used industrial oils AND brand-5A, AND 8A according to GOST 20799-88, year of entry 1988, transformer oil GOST 10121-76, commissioned in the year 1976, capacitor oil GOST 5775-85, year of entry 1985, spun the oil GOST 1642-75, commissioned in the year 1975, mixtures thereof, and waste oil after purification and dehydration. Constraints on the choice of oil impose solubility in him antiseptics, viscosity, toxicity, acidity, volatility, price.

The main characteristic of the oil is its viscosity.

For the characteristic viscosity of petroleum adopted viscosity, determined in accordance with GOST 8420-74, commissioned in the year 1974, Russia, by measuring time elapsed, in seconds, of a certain volume of product through the calibration nozzle diameter of 4 mm viscometer type VZ-246.

To expedite and facilitate the impregnation of the oil should have a viscosity not more than 15 spri (20± 0,5)°With the viscometer VZ-246 with the nozzle diameter of 4 mm, the minimum volatility at temperatures up to 80°must be budget neutral (pH≈7), non-toxic, no pungent smell, must dissolve antiseptic, without changing its properties.

To the greatest degree meets all of these requirements transformer oil before and after testing, widely used in electrical industry.

As additives in the impregnating composition is proposed to use antiseptics to give a fibrous material and a protective cover cable gribomont, corrosion inhibitors to protect metal sheath and armour of the cable from corrosion and antioxidants for protection of the impregnated yarn and bitumen from oxidation.

Constraints on the choice of antiseptic impose its degree of antimicrobial and antifungal protection cable, compatible with impregnating composition and bitumen (solubility), toxicity, resistance to leaching in water, chemical neutrality with respect to the yarn, oil, and other additives, as well as to the elements of the cable cost. Antiseptic should provide funginertness yarn and protective covers of the cable based on it. The degree of biofouling mushrooms soaked yarn should not exceed two points according to GOST 9.048-89, commissioned in the year 1989. Antiseptic is not the debtor shall cause or contribute to corrosion of metallic cable sheath and armor.

Research JSC "VNIIKP" found that the most well-known antiseptic in the cable industry - copper naphthenate used in the manufacture of impregnated cable yarn according to OST 17-05-047-2001, under certain conditions can cause or exacerbate corrosion of metallic cable sheath (aluminum and lead) and armor, so the use of this antiseptic impregnation elements of the protective coverings of cables is prohibited by a Decision of the Association "cable" and Gosstandart of Russia from 01.07.98, besides naphthenate copper is highly toxic and expensive product that is not produced in Russia. The naphthenate copper precipitates during long-term storage and the use of an impregnating composition (copper naphthenate 15% + cable oil 75%) in digesters, significantly increases the viscosity of the impregnating composition. For these reasons, the naphthenate copper cannot be used in a new protective material.

There are also bezmetallny antiseptics alkaline type, which include antiseptics: AC-2 on THE other 2416-007-05773103-98, year of entry 1998, ASC-1 on THE other 84-07509103.489-98, year of entry 1998.

Data antiseptics-based amine derivatives are hazardous substances (from 2 to 3 hazard class according to GOST 12.1.007-76, year of entry 1976).

This funginertness protective fibrous material is provided only at an elevated content is such antiseptics (more than 5% by weight).

Antiseptics amine type partially washed out in the water are oxidized and eventually lose their effectiveness.

The authors of the invention it is proposed to use as antiseptics for yarn impregnated cable new high-performance, low-hazard substances, which are the products of interactions between aromatic hydrocarbons (meta-cresol, ortho-cresol, para-cresol, phenol and others) with isobutylene.

Data antiseptics provide a protective material for a long funginertness, not washed in water, highly soluble in petroleum products and additionally exhibit the properties of antioxidants and corrosion inhibitors.

The most studied and effective product of the interaction of aromatic hydrocarbons with isobutylene is part biocorrosion-protective cable on THE 2439-006-50289046-2003, commissioned in the year 2003, the brand ASCM-1A - low hazard product hazard class 4 according to GOST 12.1.007-76.

Antiseptic ASCM-1A developed by the authors of the invention and is made of non-deficient and low-cost domestic raw materials.

Proposed by the authors protective cable material manufactured according to the following technology.

Fibrous base palacruceros core yarn is made by spinning machines by way short of wool, used for spinning bast fibres.

The spun yarn ne is emotives on khrestomatijnyj machines with reels on the sleeve in tight bobbin has a cylindrical shape. Next, the yarn bobbins impregnated with an antiseptic solution in liquid petroleum products by immersing bobbins of yarn in a container of hot impregnating composition for a certain time and pressed on the centrifuge.

The content of the impregnating composition in the finished material is brought through the wringer to 12.2 29.5% respectively by weight. The lower limit of the content of an impregnating composition is determined by the technological possibilities of extraction. The increase in the content of the impregnating composition in the material above the upper limit leads to a significant deterioration of the performance characteristics of the material and the protective cover of the cable due to the different viscosity of the bitumen layer cover oil and reduce the adhesion between the coils of yarn and armor of the cable. This deteriorates the appearance of the cable.

The essence of the invention is illustrated by the following example.

The table below shows the variety of compositions of the few examples of cable protective material, including material composition of the prototype, as well as their main characteristics.

For the manufacture of protective material on the prototype was used hemp and jute spun yarn with a linear density of 2200 dtex, soaked in a solution of copper naphthenate in cable oil.

For producing samples of the new protective material used jute malagrotta yarn with a linear density of 220 dtex, reinforced nylon yarn with a linear density of 96 Tex and impregnated with an antiseptic solution ASCM-1A in transformer oil.

Consumption impregnated yarn prototype and samples of the new protective material according to this invention was tested on the same type of cable grade ABL 3×120 10 kV with impregnated paper insulation.

As can be seen from the table, with equal strength and gribomont new material is significantly superior to the prototype in his consumption per unit length of the cable and technology.

The optimal content of components in the material, wt.%:

Liquid non-volatile or low volatile
low viscosity oil12-28
Antiseptic0,2-1,5
YarnRest

The reduction in the content of oil is difficult due to technological reasons. The increase in the content of oil leads to poor performance and processability of the material.

The reduction in the content of antiseptics reduce gribomont material, and the increase in the content of antiseptic reduces the processability impregnating composition and appreciation of the material.

Empirically also installed n the significant impact brands of liquid non-volatile or low volatile low viscosity oil on the main characteristics of the material.

New protective cable material with the antiseptic ASCM-1A has been extensively tested in JSC Kamkabel". Received permission "VNII KP and technical Committee for standardization TC 46 "Cable products" on the use of new materials in armoured cables.

Adjusted for the production of this material.

Table
Options specimensContent, wt.%Characteristics of the impregnated materialNote
OilAntisepticYarnLinear density, TexThe breaking load, kgfTwists per 1 mFunginertness, scoreThe consumption of 1 km of cable, kg
Prototype355,060,0310014,5760160The raw material, - low-tech, low opacity
1120,2of 87.8260015422110Material tech
214 0,185,9265014,5384116Poor funginertness
3180,481,6270016441112Material tech

Continuation of the table
Options specimensContent, wt.%Characteristics of the impregnated materialNote
OilAntisepticYarnLinear density, TexThe breaking load, kgfTwists per 1 mFunginertness, scoreThe consumption of 1 km of cable, kg
4200,679,4270011151-Material-low-tech, breaks, when applied to a cable
5190,580,5270013,5201105Material technology is
6210,578,5275014,5431115Material tech
7200,779,3270014500120Material tech

Continuation of the table
Options specimensContent, wt.%Characteristics of the impregnated materialNote
OilAntisepticYarnLinear density, TexThe breaking load, kgfTwists per 1 mFunginertness, scoreThe consumption of 1 km of cable, kg
8230,976,1280015580145Material-low-tech, low opacity
9251,273,8280014450120the material technology
10281,570,5290014,8421116Material tech
11341,564,5300015,5461130The raw material, - low-tech

1. The material of the protective cable, made in the form palacruceros yarn flat section with twists 20-50 per 1 m and with a linear density of 1500-3500 Tex, made from the bast or mixed fibres, reinforced with high-strength filament of synthetic fiber linear density 60-120 Tex or bast fibers with a linear density of 200 to 600 dtex, with a tenacity that is part of 30-60% of the breaking load of the yarn, impregnated with a composition comprising a liquid non-volatile or low volatile low viscosity oil and antiseptic - ASCM-1A - product of the interaction of aromatic hydrocarbons with isobutylene in the following ratio, wt.%:

Liquid non-volatile or low volatile
low viscosity oil12-28
Antiseptic0,2-1,5
YarnRest

2. The material of the protective cable according to claim 1, characterized in that it is made in the form of a yarn of jute.

3. The material of the protective cable according to claim 1, characterized in that the reinforcing threads it contains high tenacity yarn of polyamide fibers.

4. The material of the protective cable according to claim 1, characterized in that as a liquid non-volatile or low volatile low viscosity oil it contains transformer oil.



 

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