KR101290831B1 - Cables for using marine and off-shore ballast pump - Google Patents

Abstract

The present invention relates to a composite underwater cable for a ballast pump, and more particularly, the present invention is very excellent in fouling resistance, flexibility, rigidity, heat resistance deformation, oil resistance, water resistance, in particular, corrosion resistance to salt, resistance to salt water immersion In addition to significantly improving the efficiency, it also relates to an environmentally friendly composite underwater cable using halogen-free materials.

Description

Composite underwater cable for ballast pumps for ships and marine vessels {Cables for using marine and off-shore ballast pump}

The present invention relates to a composite underwater cable and a ballast pump using the same, and more particularly, the present invention has excellent pollution resistance, flexibility, rigidity, heat resistance deformation, oil resistance, water resistance, especially salt resistance, and salt water immersion. The present invention relates to an environmentally friendly composite underwater cable using a halogen-free material and a ballast pump using the same.

Cables used in ships and oceans are more flexible and stiff, pollution resistant, heat resistant, oil resistant, flame retardant, and water resistant due to various environmental conditions such as various rapid temperature changes, oil contact, and especially submersion in sea water, compared to general land cables. This is required and, in particular, requires corrosion resistance to salts.

When the ballast pump is operated by a ship or offshore drilling vessel or when the drilling vessel is drilled, if the center of gravity does not fit, the ballast pump is severely shaken from side to side, and there is a risk of overturning or sinking, and drilling is impossible. To prevent this, separate tanks called ballast tanks are installed on the bottom and left and right sides of the hull, and the seawater is confined so that the center of gravity moves down like a tower to ensure resiliency and propulsion at a suitable surface. To do it.

Ballast pumps are to be operational at all times even if part of the hull is damaged and the ballast pump room is flooded to prevent overturning or sinking of the hull. In this case, the cable for the ballast pump installed in the ballast pump is immersed in the seawater containing salt, it should be provided with corrosion resistance to salt as a more important characteristic in the conditions of the cable.

In addition, halogen-containing resins, such as chloroprene rubber, chlorosulfonated, polyethylene, and chlorinated polyethylene, generally have global environmental regulations for halogen-containing polymer resins and the need for halogen-free in the market. There is a need for improvements to the rubber applied.

Korean Patent Publication No. 2004-0038180 (2005.03.18)

The present invention has been made to solve the problems described above, the object of the present invention is to show pollution resistance, flexibility, rigidity, heat resistance deformation, oil resistance, flame retardancy, water resistance and at the same time contains little halogen, eco-friendly, salt The purpose of the present invention is to provide a composite underwater cable for ballast pumps in ships and offshore, which can improve corrosion resistance and significantly increase pressure resistance to seawater ingress.

In the present invention, since the cable installed in the ballast pump is submerged in seawater, the corrosion resistance to salt is increased, and the resistance pressure against the salt water is greatly improved, and at the same time, it does not contain a halogen material in the insulating layer and the sheath, which is environmentally friendly. Provides a composite underwater cable for ballast pumps in ships and offshore.

The composite underwater cable for a ballast pump according to the present invention, as shown in Figure 1, three or more core wire conductor for supplying power to the ballast pump; An insulating layer capable of insulating coating the core conductor; A primary sheath surrounding the aggregate incorporating the core conductors covered with the insulating layer; A braided layer surrounding the primary sheath and a secondary sheath surrounding the braided layer.

In this case, the insulating layer includes 50 to 200 parts by weight of inorganic filler, 0.5 to 10 parts by weight of silane coupling agent, 0.5 to 10 parts by weight of crosslinking aid and 2 to 15 parts by weight of crosslinking agent based on 100 parts by weight of ethylene-propylene-diene resin. and,

The primary sheath is non-halogen based on 100 parts by weight of the base resin containing 50 to 90% by weight of ethylene vinyl acetate copolymer having a vinyl acetate content of 20 to 33% by weight and 10 to 50% by weight of ethylene-propylene-diene rubber. 80 to 300 parts by weight of a flame retardant, 1 to 25 parts by weight of a flame retardant aid, 0.5 to 8 parts by weight of a silane coupling agent, 0.5 to 10 parts by weight of a crosslinking aid, and 2 to 15 parts by weight of a crosslinking agent,

The braided layer includes braiding at least one selected from galvanized steel wire, tinned or bronze on the outer circumference of the primary sheath,

The secondary sheath is a base comprising 50 to 80% by weight of an ethylene vinyl acetate copolymer having a vinyl acetate content of 20 to 33% by weight and 20 to 50% by weight of an ethylene vinyl acetate copolymer having a vinyl acetate content of 34 to 80% by weight. 80 to 250 parts by weight of non-halogen flame retardant, 2 to 25 parts by weight of flame retardant auxiliary agent, 0.5 to 8 parts by weight of silane coupling agent, 0.5 to 10 parts by weight of crosslinking aid and 2 to 15 parts by weight of crosslinking agent per 100 parts by weight of resin. .

Hereinafter, the present invention will be described in more detail.

In the present invention, the insulating layer composition is based on 100 parts by weight of ethylene-propylene-diene resin, 50 to 200 parts by weight of inorganic filler, 0.5 to 10 parts by weight of silane coupling agent, 0.5 to 10 parts by weight of crosslinking aid and 2 to 15 parts by weight of crosslinking agent. Include.

In the present invention, the ethylene-propylene-diene rubber used in the insulating layer has a high molecular weight, and the ethylene content is in the range of 50 to 73%, and the Mooney viscosity (ML1 + 4,125 ° C) is 20-30 to use the resin extrusion. It is possible to increase the insulation characteristics and withstand voltage characteristics by improving the ease and smoothness of the insulating surface. In addition, mechanical properties such as tensile strength and elongation can be improved and durability, chemical resistance, and combination with other components can express synergistic effect of corrosion resistance to salt water or resistance pressure to salt water immersion.

In the present invention, the insulating layer is a low density polyethylene (LDPE), ethylene-alpha olefin copolymer, propylene-alpha olefin copolymer, ethylene-vinyl acetate (EVA) copolymer, ethylene-methyl acrylate (EMA) copolymer, ethylene A rubber resin selected from the group consisting of propylene monomer (EPM) rubber and polyolefin elastomer (POE); Or a polar modified resin which is an ethylene-propylene-diene monomer or polyolefin elastomer grafted with any one or a mixture of two or more materials selected from the group consisting of maleic anhydride, fatty acids, aminosilanes and vinylsilanes; At least one or more auxiliary resins may be further included. At this time, the content of the auxiliary resin is preferably 1 to 80 parts by weight, based on 100 parts by weight of ethylene-propylene-diene rubber. When the content of the auxiliary resin is out of the above range, the withstand voltage characteristic may be reduced due to the occurrence of an eccentric phenomenon due to the pressing of the outer surface of the insulator, and the electrical characteristic may be deteriorated when the resin content of the polar group is increased.

The inorganic filler of the insulating layer is characterized in that it comprises at least one material selected from the group consisting of calcium carbonate, magnesium carbonate, calcium silicate, titanium white, talc, mica, based on 100 parts by weight of ethylene-propylene-diene rubber It is preferred to include 50 to 200 parts by weight. Outside the above range, it is difficult to expect the desired physical properties, and mechanical properties may be degraded or durability may be degraded.

At this time, the inorganic filler is characterized in that it is coated with a hydrophobic material selected from the group consisting of uncoated or stearic acid, oleic acid, fatty acids, aminosilane and vinylsilane.

The silane coupling agent is tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, tetrabutoxysilane, methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, propyl Trimethoxysilane, propyltriethoxysilane, butyltrimethoxysilane, butyltriethoxysilane, pentyltrimethoxysilane, pentyltriethoxysilane, heptyltrimethoxysilane, heptyltriethoxysilane, octyltrimeth Methoxysilane, octyltriethoxysilane, dodecyltrimethoxysilane, dodecyltriethoxysilane, hexadecyltrimethoxysilane, hexadecyltriethoxysilane, octadecyltrimethoxysilane, octadecyltriethoxysilane , Phenyltrimethoxysilane, phenyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltri Methoxy Column, γ-glycidoxypropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane or vinyl siloxane oligomer It includes any one or more.

The silane coupling agent is characterized in that 0.5 to 10 parts by weight based on 100 parts by weight of ethylene-propylene-diene rubber. If the content is less than 0.5 parts by weight, the tensile strength is lowered or the elongation is excessively increased. If the content is more than 10 parts by weight, the elongation may be lowered.

The crosslinking aid is preferably used at least one selected from triarylcyanurate or triarylisocyanurate, but is not limited thereto. At this time, the crosslinking aid is characterized in that it comprises 0.5 to 10 parts by weight based on 100 parts by weight of ethylene-propylene-diene rubber. When the content is less than 0.5 parts by weight, the tensile strength is lowered, the insulation may be deformed due to crushing at high temperatures, and when it exceeds 10 parts by weight, the elongation is lowered.

The crosslinking agent is preferably used a peroxide crosslinking agent, characterized in that 2 to 15 parts by weight based on 100 parts by weight of ethylene-propylene-diene rubber. When the content is less than 2 parts by weight, the tensile strength and heat resistance may be degraded, or pressing may occur at a high temperature, thereby insulating the insulation. When the content is more than 15 parts by weight, the heat resistance and elongation may be reduced.

At this time, preferred crosslinking agents include di- (2,4-dichlorobenzoyl) -peroxide (di- (2,4-dichlorobenzoyl) -peroxide), dibenzoyl peroxide, tert-butyl peroxybenzoate (tert-butyl peroxybenzoate), 1,1-di- (tert-butylperoxy) -3,3,5-trimethylcyclohexane (1,1-di- (tert-butylperoxy) -3,3,5- trimethylcyclohexane), Dicumyl peroxide, Di- (2-tert-butyl-peroxyisopropyl) -benzene [di- (2-tert-butyl-peroxyisopropyl) -benzene], terrestrial- Tert-butylcumylperoxide, 2,5-dimethyl-2,5-di- (tertiary-butylperoxy) -hexane [2,5-Dimethyl-2,5-di- (tert-butylperoxy ) -hexane], Di-tert-butylperoxide and 2,5-dimethyl-2,5-di (tertiarybutylperoxy) hexim-3 [2,5-dimethyl Any one or more compounds selected from the group consisting of -2,5-di (tert-butylperoxy) hexyme-3 can be used.

In the present invention, the insulating layer is capable of insulating coating the core conductor for supplying power to the ballast pump, and has an insulation resistance of 1 × 10 ¹⁵ Ω · cm or more.

In the present invention, the composition of the primary sheath surrounding the aggregate in which the core conductors coated with the insulating layer are combined is 50 to 90 wt% of ethylene vinyl acetate copolymer having 20 to 33 wt% of vinyl acetate and ethylene-propylene-diene rubber. 80 to 300 parts by weight of a non-halogen flame retardant, 1 to 25 parts by weight of a flame retardant aid, 0.5 to 8 parts by weight of a silane coupling agent, and 0.5 to 10 parts by weight of a crosslinking aid based on 100 parts by weight of the base resin including 10 to 50% by weight. And 2 to 15 parts by weight of a crosslinking agent.

The base resin of the primary sheath is characterized by using 50 to 90% by weight of ethylene vinyl acetate copolymer having a vinyl acetate content of 20 to 33% by weight and 10 to 50% by weight of ethylene-propylene-diene rubber. At this time, the vinyl acetate copolymer is preferably a vinyl acetate content of 20 ~ 33%, if the outside of the above range is increased adhesiveness to increase the extruder load to reduce the extruded workability and the adhesiveness with the insulator surface when laying the insulation surface Residues are left on the surface and insufficient weight percent can reduce flexibility and reduce oil resistance.

In addition, the base resin is characterized in that the mixed weight ratio of the vinyl acetate copolymer and ethylene-propylene-diene rubber is 50 ~ 90: 10 ~ 50, the mechanical properties can be lowered outside the above range and the flexibility of the product It will fall and oil resistance will fall.

It is preferable to use 80-300 weight part of said non-halogen flame retardants with respect to 100 weight part of base resins. Outside the above range, it is difficult to expect flame retardancy, or corrosion resistance and mechanical properties against salt water immersion may be reduced.

In this case, the non-halogen flame retardant includes, but is not limited to, any one or more metal hydroxides selected from the group consisting of aluminum hydroxide, magnesium hydroxide, calcium hydroxide, hydrotalcite, huntite and hydromagnesite.

In addition, the metal hydroxide includes a surface modified. Surface modification treatment is to react the silane-based compound of Formula 1 with the metal hydroxide to be coated on the surface of the metal hydroxide particles.

[Formula 1]

HS-R ¹ -Si (OR ² ) ₃

[In Formula 1, R ¹ represents (C1-C30) alkylene, (C6-C20) arylene, (C6-C20) ar (C1-C30) alkylene or (C1-C30) alkyl (C6-C20) aryl And alkyl is linear or branched and may include unsaturated bonds in the carbon chain, and the carbon atoms of the aryl may be substituted with one or more heteroelements selected from N, O, S, P and Si;

R ² is selected from linear or branched (C 1 -C 7) alkyl.]

Aryl in R ¹ of Chemical Formula 1 may include phenyl, naphthyl, anthryl, biphenyl, etc. as an aromatic ring, and alkyl in R ¹ and R ² may include methyl, ethyl, propyl, butyl, and the like. Can be mentioned.

The silane-based compound of Formula 1 has a mercapto group (-SH) in addition to the alkoxy group (-OR ² ) to increase the chemical bonding strength between the TPU and the inorganic flame retardant to improve the chemical resistance, tensile strength and Improve oil resistance more.

It is preferable to use 1 to 30 parts by weight of the silane compound based on 100 parts by weight of the base resin, the use of less than the above range, the synergistic effect of flame retardancy, corrosion resistance, mechanical properties are insignificant, the use of excess exceeds the compatibility do.

The flame retardant auxiliary agent may be used any one or more selected from borate, boric acid compound, silicon-based compound or molybdenum-based compound, it is preferable to include 2 to 25 parts by weight for low smoke properties. If the content is less than 2 parts by weight, it is difficult to expect the effect of suppressing smoke generation in the combustion process, and if it exceeds 25 parts by weight, the tensile strength and elongation properties are reduced.

The silane coupling agent is tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, tetrabutoxysilane, methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, propyl Trimethoxysilane, propyltriethoxysilane, butyltrimethoxysilane, butyltriethoxysilane, pentyltrimethoxysilane, pentyltriethoxysilane, heptyltrimethoxysilane, heptyltriethoxysilane, octyltrimeth Methoxysilane, octyltriethoxysilane, dodecyltrimethoxysilane, dodecyltriethoxysilane, hexadecyltrimethoxysilane, hexadecyltriethoxysilane, octadecyltrimethoxysilane, octadecyltriethoxysilane , Phenyltrimethoxysilane, phenyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltri Methoxy Column, γ-glycidoxypropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane or vinyl siloxane oligomer It includes any one or more.

The silane coupling agent is characterized by using 0.5 to 8 parts by weight based on 100 parts by weight of ethylene-propylene-diene rubber. When the content is less than 0.5 parts by weight, the tensile strength is lowered or the elongation is excessively increased. When the content is more than 8 parts by weight, the elongation may be lowered.

The crosslinking aid is preferably used at least one selected from triarylcyanurate or triarylisocyanurate, but is not limited thereto. At this time, the crosslinking aid is characterized in that it comprises 0.5 to 10 parts by weight based on 100 parts by weight of ethylene-propylene-diene rubber. When the content is less than 0.5 parts by weight, the tensile strength is lowered, the insulation may be deformed due to crushing at high temperatures, and when it exceeds 10 parts by weight, the elongation is lowered.

The crosslinking agent is preferably used a peroxide crosslinking agent, characterized in that 2 to 12 parts by weight based on 100 parts by weight of ethylene-propylene-diene rubber. When the content is less than 2 parts by weight, tensile strength and heat resistance may be reduced, or pressing may occur at a high temperature, thereby insulating the insulation. When the content is more than 12 parts by weight, heat resistance and elongation may be reduced. In this case, a crosslinking agent that may be used may be used in the insulating layer, but is not limited thereto.

The present invention is provided with a braided layer surrounding the primary sheath, characterized in that the braided one or more selected from the galvanized steel wire, tin-plated interlocking wire or bronze on the outer circumference of the primary sheath.

In the present invention, the secondary sheath is provided surrounding the braided layer. The composition of this secondary sheath comprises 50 to 80% by weight of ethylene vinyl acetate copolymer having a vinyl acetate content of 20 to 33% by weight and 20 to 50% by weight of ethylene vinyl acetate copolymer having a vinyl acetate content of 34 to 80% by weight. 80 to 250 parts by weight of a non-halogen flame retardant, 2 to 25 parts by weight of a flame retardant aid, 0.5 to 8 parts by weight of a silane coupling agent, 0.5 to 10 parts by weight of a crosslinking aid, and 2 to 15 parts by weight of a crosslinking agent with respect to 100 parts by weight of the base resin. It is characterized by including.

The composition of the secondary sheath comprises a base resin, a non-halogen flame retardant, a flame retardant aid, a silane coupling agent, a crosslinking aid and a crosslinking agent used in the primary sheath.

At this time, the non-halogen-based flame retardant is preferably used 80 to 250 parts by weight of mixed metal hydroxide consisting of 20 to 50 parts by weight of the metal hydroxide untreated surface and 60 to 200 parts by weight of the metal hydroxide surface treated with silane. If the weight ratio of the metal hydroxide not surface treated is increased, the elongation rate is increased, but the mechanical tensile strength is lowered, and the resistance to salt water is reduced, thereby reducing the withstand voltage characteristics. In addition, when the weight ratio of the metal hydroxide surface-treated with silane increases, the elongation rate decreases, the mechanical strength increases, and the resistance to salt water is improved by the effect of the surface treatment. An appropriate mixing weight ratio is made to satisfy the required mechanical properties.

The composition in the cable according to the present invention may further include a stabilizer, a processing aid, an antioxidant, an ultraviolet stabilizer or an antioxidant as an additive, but is not limited thereto.

Examples of the stabilizer may include zinc stearate or the like as an organic acid metal salt or mixture thereof, or an organic acid metal salt including zinc, calcium, magnesium, and the like, and the processing aid may be a hydrocarbon-based material such as paraffin wax or stearate. Fatty acid materials such as steric acid can be used. In addition, the ultraviolet stabilizer is a benzotriazole compound, a benzophenone compound, a HALS compound, an aromatic benzoate compound, a cyanoacrylate compound, an oxalate anhydride compound, a hydroxyaryl-1,3,5-triazine compound And it may be used any one or more selected from the sterically hindered amine compound, the antioxidant may be used alone or two or more of the phenol-based antioxidant or phosphoric acid-based antioxidant. It is preferable to use 0.01 to 10 parts by weight with respect to 100 parts by weight of the base resin so that the content of these additives corresponds to the respective properties.

The composite underwater cable according to the present invention is characterized in that the maximum pressure of the immersion resistance to salt water containing salt is 5 bar.

On the other hand, the present invention can provide a ballast pump comprising a composite underwater cable as described above.

The composite underwater cable for ship and marine ballast pumps according to the present invention has a very high corrosion resistance to salts even when immersed in salt water containing salts, and can significantly improve the pressure resistance to salt water immersion. Flexibility, rigidity, heat resistance deformation, oil resistance, flame retardancy, and at the same time contains little halogen, there is an environmentally friendly advantage.

Figure 1 shows one embodiment of the composite underwater cable for the ballast pump according to the present invention.

A preferred embodiment of the composite underwater cable for a ballast pump according to the present invention is shown in FIG. The composite underwater cable includes a plurality of core conductors (1), an insulating layer (2) capable of insulating the core conductors and the core conductors, and a primary sheath (4) surrounding the aggregate in which the core conductors coated with the insulating layers are combined. And a braided layer 5 surrounding the primary sheath, and a secondary sheath 6 surrounding the braided layer, optionally the outer circumference of the collection of insulating layers 2 and the inner circumference of the primary sheath 4. It may further include a filler layer (3) to fill the space to be formed, a filler may be used a polypropylene compound.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the scope of the present invention is not limited by the following Examples.

[evaluation]

1) Salt water immersion test

Under pressure (5.0 bar) according to IEEE 1580 clause 5.17.8, the brine with 20% salinity was filled in the chamber and submerged at 60 ± 1 ° C for 10 days to observe the change in corrosion resistance and immersion. As a result, when the coils were wound (bent) to a mandrel having an outer diameter of 9 times the total outer diameter of the cable sample (bending) to test the electric strength test and the mechanical properties of the sheath and the insulator to test the electrical properties, If it is not submerged and a state is favorable, it will be described as (circle), otherwise it will describe as x.

2) Tensile Strength and Elongation

 Tensile strength and elongation shall be measured in accordance with IEC 60811-1-1 and the tensile strength shall exceed 0.92kgf / mm2 and the elongation shall exceed 120%.

3) Oxygen Index

Tested according to ASTM D 2863, the value should be 32 or higher.

4) Smoke density

Tested with finished cable according to IEC 61034-1,2, the transmittance should be over 60%.

5) Flame retardant

The combustion length should be less than 2.5M when tested according to the flame retardant test standard of IEC 60332-3-22 cat-A.

[Production Example 1]

1) Insulation layer resin composition

Insulating layer resin composition using 50 weight part of inorganic fillers, 0.5 weight part of silane coupling agents, 0.5 weight part of crosslinking aids, and 2 weight part of crosslinking agents with respect to 100 weight part of ethylene-propylene-diene copolymers (KEPho Polychem Co., KEP 510). Was prepared.

2) primary sheath composition

80 parts by weight of non-halogen-based flame retardant, 1 part by weight of flame-retardant aid, 0.5 part by weight of silane coupling agent, and crosslinking to 100 parts by weight of base resin including 50% by weight of ethylene-propylene-diene copolymer and 50% by weight of vinyl acetate copolymer. The primary sheath composition was prepared using 0.5 part by weight of the preparation and 2 parts by weight of the crosslinking agent.

3) secondary sheath composition

Ethylene vinyl acetate copolymer with vinyl acetate content of 15 to 33 wt% (Hanhwa Chemical, EVA 1159) 50 to 80 wt% and ethylene vinyl acetate copolymer with 34 to 80 wt% vinyl acetate content (MITSUI & CO., LTD , EV45LX) 180 parts by weight of non-halogen flame retardant, 1 part by weight of flame retardant aid, 0.5 part by weight of silane coupling agent, 2.0 parts by weight of crosslinking aid and 8 parts by weight of crosslinking agent based on 100 parts by weight of base resin including 20-50% by weight. To prepare a second sheath composition.

[Examples 1 to 4 and Comparative Examples 1 to 2]

Using the composition of Preparation Example 1 was prepared a composite underwater cable for a ballast pump as shown in FIG.

Core conductor (1) consisting of tin-plated copper wire, insulation layer (2) made of ethylene-propylene-diene rubber, core wire coated with insulation layer through extrusion and cooling process using T-Die extruder The primary sheath layer 4 and the galvanized wire braided layer 5 were coated on the aggregate in which the three conductors and the polypropylene filler layer 3 were combined to fabricate the associated wire rod, and the secondary sheath on the combined wire rod. (6) was formed. Among them, the insulator layer and the primary sheath layer are composite underwater cables while changing the mixing ratio of the secondary sheath layer directly contacting the composite underwater cable for ballast pumps while using a composition having properties satisfying the IEC standard. To prepare a property test, including the salt water immersion test, the results are shown in Table 2 below.

[Table 1]

[Table 2]

In Examples 1 to 4 according to the present invention, as the proportion of the aluminum hydroxide which was not surface treated increased, the resistance to brine decreased, and the elongation rate and oxygen index increased. On the other hand, in Comparative Examples 1 and 2, the mixing of ethylene propylene terpolymers resulted in good resistance to salt water, but the mechanical properties and flame retardancy were lowered.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

DESCRIPTION OF SYMBOLS 1 Core conductor 2 Insulation layer 3 Filler layer
4: primary sheath 5: braided layer 6: secondary sheath
10: composite underwater cable

Claims (14)

An insulation layer capable of insulating and covering the core conductor and the core conductor, a primary sheath surrounding the aggregate in which the core conductors covered with the insulation layer are combined, a braided layer surrounding the primary sheath, and a secondary surrounding the braided layer. With sheath,
The said insulating layer contains 50-200 weight part of inorganic fillers, 0.5-10 weight part of silane coupling agents, 0.5-10 weight part of crosslinking aids, and 2-15 weight part of crosslinking agents with respect to 100 weight part of ethylene propylene-diene resins,
The primary sheath is 80 to 300 parts by weight of a non-halogen flame retardant, 1 to 25 parts by weight of a flame retardant aid, and a silane coupling agent based on 100 parts by weight of the base resin containing an ethylene vinyl acetate copolymer and ethylene-propylene-diene rubber. It includes-8 parts by weight, 0.5 to 10 parts by weight of crosslinking aid and 2 to 15 parts by weight of crosslinking agent,
The secondary sheath is based on 100 parts by weight of ethylene vinyl acetate copolymer, 80 to 250 parts by weight of a non-halogen flame retardant, 2 to 25 parts by weight of a flame retardant aid, 0.5 to 8 parts by weight of a silane coupling agent, and 0.5 to 10 parts by weight of a crosslinking aid. And a composite underwater cable for ballast pump comprising 2 to 15 parts by weight of crosslinking agent. The method of claim 1,
The base resin of the primary sheath is a composite underwater cable for a ballast pump comprising a vinyl acetate content of 15 to 33% by weight of 50 to 90% by weight of ethylene vinyl acetate copolymer and 10 to 50% by weight of ethylene-propylene-diene rubber. The method of claim 1,
The ethylene vinyl acetate copolymer of the secondary sheath is 50 to 80% by weight of an ethylene vinyl acetate copolymer having a vinyl acetate content of 15 to 33% by weight and 20 to 50 ethylene vinyl acetate copolymer having a vinyl acetate content of 34 to 80% by weight. Composite submersible cable for ballast pump comprising a weight percent. The method of claim 1,
The insulating layer is a low density polyethylene (LDPE), ethylene-alpha olefin copolymer, propylene-alpha olefin copolymer, ethylene-vinyl acetate (EVA) copolymer, ethylene-methyl acrylate (EMA) copolymer, ethylene-propylene monomer ( EPM) rubber and rubber resin selected from the group consisting of polyolefin elastomers (POE); Or a polar modified resin which is an ethylene-propylene-diene monomer or polyolefin elastomer grafted with any one or a mixture of two or more materials selected from the group consisting of maleic anhydride, fatty acids, aminosilanes and vinylsilanes; Composite underwater cable for ballast pump further comprising at least one auxiliary resin. The method of claim 1,
The inorganic filler of the insulating layer is a composite underwater cable for a ballast pump containing at least one material selected from the group consisting of calcium carbonate, magnesium carbonate, calcium silicate, titanium white, talc, mica. The method of claim 5,
The inorganic filler is a composite underwater cable for a ballast pump, characterized in that the coating with a hydrophobic material selected from the group consisting of stearic acid, oleic acid, fatty acids, aminosilane and vinylsilane. The method of claim 1,
The silane coupling agent is tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, tetrabutoxysilane, methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, propyl Trimethoxysilane, propyltriethoxysilane, butyltrimethoxysilane, butyltriethoxysilane, pentyltrimethoxysilane, pentyltriethoxysilane, heptyltrimethoxysilane, heptyltriethoxysilane, octyltrimeth Methoxysilane, octyltriethoxysilane, dodecyltrimethoxysilane, dodecyltriethoxysilane, hexadecyltrimethoxysilane, hexadecyltriethoxysilane, octadecyltrimethoxysilane, octadecyltriethoxysilane , Phenyltrimethoxysilane, phenyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltri Methoxy Column, γ-glycidoxypropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane or vinyl siloxane oligomer Any one or more composite underwater cable for ballast pumps. The method of claim 1,
And said insulating layer has an insulation resistance of at least 1 × 10 ¹⁵ Ω · cm. The method of claim 1,
The non-halogen-based flame retardant is a composite underwater cable for a ballast pump comprising a metal hydroxide of any one or more selected from the group consisting of aluminum hydroxide, magnesium hydroxide, calcium hydroxide, hydrotalcite, huntite and hydromagnesite. 10. The method of claim 9,
The non-halogen-based flame retardant is a composite underwater cable for a ballast pump comprising 40 to 100 parts by weight of the metal hydroxide not surface-treated and 40 to 150 parts by weight of the metal hydroxide surface-treated with silane. The method of claim 1,
The braided layer is a composite underwater cable for a ballast pump comprising braiding at least one selected from galvanized steel wire, tin plated or bronze on the outer circumference of the primary sheath. The method of claim 1,
The flame retardant auxiliary agent is a composite underwater cable for a ballast pump comprising any one or more selected from borate, boric acid compound, silicon compound and molybdenum compound. The method of claim 1,
The crosslinking aid is a composite underwater cable for a ballast pump is any one or more selected from triaryl cyanurate or triaryl isocyanurate. The method of claim 1,
The composite underwater cable for a ballast pump is a composite underwater cable for a ballast pump having a maximum pressure of 5 bar for immersion resistance to salt water containing salt.

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