Composition based on ethylene-propylene rubber for cable products

 

(57) Abstract:

The invention relates to the field of electrical engineering, in particular to compositions based on ethylene-propylene rubber, used as maguilera placeholder in electric cables and wires. The filling used in the case, if it is necessary to make the cable round shape and also for the convenience of cutting the cable during installation. Composition based on ethylene-propylene rubber contains, wt%: ethylene-propylene rubber - 100,0, paraffin - 34,0-84,0, stearic acid - 4,0-6,0, dibutyl - 4,0-13,3, chalk - 328,0-751,7, talc - 27,0-45,0. The technical result of the proposed technical solution is the elimination of adhesion to insulation, fire safety electrical cable.

The technical field to which the invention relates

Composition (rubber compound) based on ethylene-propylene rubber is used as maguilera aggregate (zonal isolation) in electrical cables and wires. The filling used in the case, if it is necessary to make the cable round shape and also for the convenience of cutting the cable during installation.

Art

Information about the analogue taken from magazine "Cables and entreprenuer rubber material for filling maguilera space OOO "ATIL" (utility model RF 13847, application number 99127823/20).

The material for filling the company "Atil" is used to fill the space between the insulated conductors and jacket.

Rubber compound is a composition consisting of rubber or mixture of rubbers), in this case, ethylene-propylene rubber and various ingredients.

Signs of similar, coinciding with significant signs of compositions based on ethylene-propylene rubber:

- ethylene-propylene rubber;

- natural chalk, talc, paraffin;

- when laying cable products rubber mixtures are vulcanized, i.e., not moving from plastic to elastic state;

- flexibility, adaptability.

The combination of the components of the rubber determines such important material filling rate, as the lack of susceptibility to adhesion (sticking) to the shell and the insulation material. When filling maguilera space material similar sometimes happened adhesion of the rubber and insulation material (mainly PVC plastic) that could lead in cable installation (cutting Denmark to the quality of products is steadily increasing. Cutting the cable (removing the protective shell, scraping lived from isolation) during installation should be done easily, accurately, without damaging the material of the insulation. In this connection, for cable products and was developed devulcanization melanotaenia rubber composition (mixture) based on ethylene-propylene rubber containing polymer 10-20% by weight of the mixture. The use of compositions based on ethylene-propylene rubber to fill maguilera space and between conductors and sheath eliminates adhesion to the insulation and sheath of PVC, to achieve fire safety electrical cable, and also gives the ability to easily, without damage to the insulation to effect cutting of the cable during installation.

This technical result is achieved by combining the following ingredients (qualitative part), distinguish the composition from similar:

The polymer is ethylene-propylene rubber, a product of copolymerization of ethylene with propylene.

Fillers inactive - natural chalk and talc.

Softeners (plasticizers) - dibutyl phthalate, paraffin, stearic acid.

Quantitative composition based at equivalent material for filling maguilera space, Mac. including:

Ethylene-propylene rubber - 100,0

Paraffin is 34.0-84,0

Stearic acid - 4,0-6,0

Dibutyl - 4,0-13,3

Chalk - 328,0-751,7

Talc - 27,0-45,0

Physico-chemical characteristics of the rubber:

the Mooney viscosity at 100oWITH 20-30,

density, kg/m31,60103-1,90103.

The electrical parameters of the composition prior to immersion in water:

- the specific volume resistance, Mme - 81012,

- dielectric strength, MV/m - 26,5.

Mechanical properties of the composition before aging:

- tensile strength test, MPa (kgf/cm2) - 0,53 (5,2),

- elongation percentage 82,

residual elongation in% 2.

Composition based on ethylene-propylene rubber provides additional benefits, which have no analogue with other qualitative and quantitative composition ingredients: ease of cutting the cable during installation to connect to, reducing the time and complexity of installation, improve fire safety.

Information confirming the possibility of carrying out the invention

For example, a method of obtaining a composition n the water in the stated ratio. Manufacture of rubber composition (mixture) is carried out in a workshop on established domestic and foreign equipment.

The content of the technological process for production of a composition based on ethylene-propylene rubber:

preparation of materials: synthetic rubber is released from the package, cut into pieces corresponding to the dimensions of the loading opening of the rubber mixer and transported to the dosing weights. Supply of chalk in the input bins with the drying is carried out on the separation plant. Talc, stearic acid, paraffin served in the packaging supplier.

The material is weighed and dosed. Weighing takes place on platform scales. Chalk weighed on an automatic balance type 4 WPC-80. The prepared material should conform to the required quantitative composition, in mass parts of a mixture of rubber FTE - 10:

Ethylene-propylene rubber - 100,0

Paraffin - 84,0

Stearic acid - 6,0

Dibutyl phthalate is 13.3

Chalk - 751,7

Talc - 45,0

Materials are loaded into a closed rubber mixer type RSVD 270/20, where there is a mixture, a belt conveyor for the implementation of SL is stearic acid and stirring.

3. Download 1/3 of chalk, talc and mixing.

4. Download 1/3 of chalk, dibutyl phthalate and mixing.

5. Discharging the mixture and the transition to the next batch.

The initial chamber temperature of the rubber mixer 70-80oC.

- Temperature paged mixture 90-100oC.

- After mixing, the mixture is fed into the filter press where it is filtered.

- Filtered mixture is developed on listvennyh rolls.

- Made the cut rubber band with listvennyh rollers for cooling mobile containers belt conveyor width 80-110 mm and a thickness of 9-11 mm

- Rubber mixture is cooled.

- Is laying the rubber mixture on the tray and carried out quality control.

The finished composition based on ethylene-propylene rubber is fed by a tape into the hopper of the extruder, where, traversing the zones heated to a temperature of 90oWith subsequent correlation insulated PVC plasticate the conductors.

The description of the ingredients of the composition based on ethylene-propylene rubber.

Rubber, SKEPT - 40; 40D. GOST 38.103252-92. The base rubber blend; is (CH2=CH2) with propylene (CH3-CH=CH2). The structural formula of ethylene-propylene rubber:

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The density of the ethylene-propylene rubber is 0.85-0,863 g/cm3. Specific heat of rubber about 0.52 cal/ggrad and thermal conductivity 8,510-4cal/schrad. The absence of ethylene-propylene rubber double bonds leads to a high chemical resistance to oxygen, ozone and many other chemically active substances, as well as to the action of light.

Rubber mixtures based on it moisture-proof, gas-tight, have a high electrical characteristics, high heat resistance and resistance to aggressive environments. In the developed mixture has to 100.0 wt.h.

Softeners (plasticizers)

Substances that increase the plasticity of the composition based on the rubber. With the introduction of a softener reduces the time of manufacture of the rubber mixture, reduces its temperature, improves the distribution of the powdered ingredients in the rubber, facilitates molding and molding the mixture by increasing its fluidity, as well as improving the surface quality of insulation and sheath. Have a positive impact on the physico-chemical and mechanical-89. Is a mixture of solid saturated hydrocarbons with the General formula CnH2n+2. Pure paraffin - colorless mass. The density of 0.90 g/cm2the melting point 52-54oC. Paraffin insoluble in water but soluble in gasoline, benzene, chloroform and many other organic solvents. Paraffin is also physical rubber antioxidant, which viotia on the surface of the insulation forms a film that protects the rubber from exposure to oxygen or ozone. Designed to improve the processing properties of rubber compounds. In the composition is from 34,0 to 84,0 wt.h.

Dibutyl phthalate. GOST 8728-88. WITH6H4(SOOS4H9)2- the ether of butyl alcohol and phthalic acid. The density of 1.05 g/cm2the boiling point 336-342oC. Prevents the migration of plasticizers from PVC compounds. In this composition contains from 4.0 to 13.3 wt.h.

Stearic acid. GOST 6484-96. The density of 0.96 g/cm3. Stearic acid, being a good softening agent, at the same time facilitates the dispersion of fillers and other ingredients in the rubber, reduces the temperature of the composition during manufacture and extrusion, and also improves cacv composition is from 4.0 to 6.0 wt.h.

Fillers

Fillers injected into the composition of the rubber compositions to improve the technological properties of mixtures, giving the necessary physico-mechanical and dielectric properties, cost reduction. In this composition are inactive (inert) fillers. As fillers in the composition are present:

Chalk natural brand IMO, MMS - 1; 2. GOST 12085-88. Consists mainly of caso3the content of which is usually 96-99%. Impurities are mainly single oxides of aluminum and iron. The density ranges from 2.6 to 2.8 g/cm3. Easy dispersibility of chalk in the rubber is primarily driven by weak cementation and low mechanical strength of its constituent particles. Chalk natural little hygroscopic and practically insoluble in water. In the composition ranges from 328 to 751,7 wt.h.

Talc brand TK-1, TCEs; GOST 13145-67. The main component of ground talc is a mineral talkit coming in chemical composition to the formula 4SiO23MgOH2O (SiO2- 63,5%, Mg - 31,7%, H2O - 4.8 per cent). Talc refers to anisotropic materials, as some of its particles have a lamellar form. Tight is you, mineralized water, air and other agents. Used in rubber mixtures with the purpose to reduce the cost and improve the technological properties. In the composition ranges from 27 to 45 wt.h.

Mix the above ingredients in the stated interval eliminates the adhesion of the composition to the material of insulation and sheath of the cable, and also provides additional benefits in the application.

Composition based on ethylene-propylene rubber to fill maguilera space cable products, characterized in that it contains ethylene-propylene rubber, paraffin, stearic acid, dibutyl phthalate, chalk and talc in the following ratio, wt.h.:

Ethylene-propylene

rubber 100,0

Paraffin 34,0 - 84,0

Stearic acid 4,0 - 6,0

Dibutyl 4,0 - 13,3

Chalk 328,0 - 751,7

Talc 27,0 - 45,0

 

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