KR20170012864A - Halogen free flame-retardant crosslinked polyolefin insulation wire - Google Patents

Abstract

The present invention relates to a halogen free flame-retardant crosslinked polyolefin insulation wire. Specifically, the present invention relates to a halogen free flame-retardant crosslinked polyolefin insulation wire which is eco-friendly, has especially excellent flame-retardant and installation properties, simultaneously satisfies heat resistance, water resistance, insulation, cold resistance, oil resistance, and so on, and also restricts a blooming effect for eluting white powder on the surface of an insulating layer after pressurizing and crosslinking to form the insulating layer.

Description

Halogen-free flame-retardant polyolefin insulation wire {

The present invention relates to a halogen-free flame-retardant crosslinked polyolefin insulation wire. More specifically, the present invention relates to a resin composition which is environmentally friendly, has excellent flame retardancy and pourable properties, is excellent in heat resistance, water resistance, insulation properties, cold resistance and oil resistance, Halogen flame retardant polyolefin bridged insulated wires which can suppress the blooming effect of elution of white powder into the flame retardant polyolefin.

Electric wires used for general electrical work or electrical equipment wiring, indoor wiring, etc., have excellent heat resistance, flame retardancy, water resistance, chemical resistance, insulation, cold resistance and oil resistance .

In addition, the wires for indoor wiring such as electric lamps, electric heaters, etc. are installed in a way that they are drawn out from a certain point such as a ceiling, a wall, , Where the wires leading into the interior of the ceiling, walls and floors are transported through conduits made of a material such as PVC, which protects them and guides them until their withdrawal.

If the electric wire transferred through the conduit has excessive flexibility or stiffness, it may be difficult to transfer and it may be difficult to transfer due to friction with the inner wall of the conduit or with other wires drawn together. Particularly, when the electric wire is transported through the conduit in a curved region according to the structure of a building, a ceiling of a facility, a wall, a floor, and the like, further transportation may be difficult.

Therefore, the electric wire has flexibility and stiffness suitable for transportation, and minimizes the friction between the electric wire and the inner wall of the electric wire or other electric wire to be fed together, thereby improving the waterproofing property of the electric wire. The coefficient of friction must be sufficiently low. In addition, in order to improve the installation performance of the electric wire, there is a case where the surface of the electric wire is coated with lubricating oil or the like and the installation work is carried out. In this case, the insulating layer constituting the electric wire should have improved oil resistance against the lubricating oil and the like.

Heat-resistant PVC insulation wire which is conventionally used for indoor wiring and the like is a wire insulated with a PVC resin containing a heat-resistant plasticizer. The PVC resin is excellent in heat resistance, flame retardancy, chemical resistance, water resistance, On the other hand, it has a relatively low maximum allowable temperature of the wire, it is not only harmful to human body but also causes environmental problems such as generation of toxic gas during burning for disposal of electric wire, and thus it is regulating use thereof.

Non-halogen flame retardant polyolefin bridged insulated wires have been developed and used to replace heat resistant vinyl insulated wires having the above problems. The non-halogen flame retardant polyolefin bridged insulated electric wire is an electric wire insulated with a non-halogen insulating resin to which a flame retardant is added, and is environmentally friendly because it uses a non-halogen insulating resin.

However, since the non-halogen flame retardant polyolefin bridged insulated wire is higher in price than the conventional heat resistant vinyl insulated wire and the flame retardant added to ensure flame retardancy corresponding to the conventional PVC resin, the surface friction coefficient of the insulating layer increases, Is greatly reduced. Furthermore, a certain amount of CMB (color master batch) is added to the insulating layer for the purpose of identifying a specific color for identification with other adjacent wires. For this reason, by adding CMB, There is a problem of deterioration.

On the other hand, when the conventional insulating composition includes additives such as an antioxidant and a lubricant, white or gray powder containing the additive is dissolved and remains on the surface of the insulating layer during extrusion molding to form an insulating layer of the cable. resulting in poor appearance of the cable, deterioration of workability, and the like.

Therefore, it is environmentally friendly, has excellent flame retardancy and durability, and satisfies the characteristics such as heat resistance, water resistance, insulation, cold resistance and oil resistance at the same time. Further, after extrusion and crosslinking to form an insulating layer, white powder There is a serious demand for a wire for indoor wiring that can suppress the blooming phenomenon that is eluted.

An object of the present invention is to provide an environmentally friendly non-halogen flame retardant polyolefin insulated electric wire.

It is another object of the present invention to provide a halogen-free flame retardant polyolefin insulated electric wire excellent in flame retardancy and durability.

It is another object of the present invention to provide a halogen-free flame retardant polyolefin insulated electric wire which can simultaneously satisfy characteristics such as heat resistance, water resistance, insulation, cold resistance and oil resistance.

Further, it is an object of the present invention to provide a non-halogen flame retardant polyolefin crosslinked insulation cable capable of suppressing the blooming phenomenon of the insulating layer.

In order to solve the above problems,

Non-halogen flame retardant bridging insulating wire for indoor wiring, comprising: a conductor; And an insulating layer formed by crosslinking the conductor and an insulating composition comprising a halogen-free resin as a base resin, wherein the insulating composition includes an antioxidant and a flame retardant, and the antioxidant has a melting point of 90 ° C Halogen-free flame-retardant bridged insulated electric wire, wherein the insulation layer comprises an insulation inner layer and an insulation outer layer, and the insulation outer layer further comprises a pigment for color implementation and a further activator for improving the installation property.

Here, the content of the flame retardant is 100 to 180 parts by weight based on 100 parts by weight of the base resin.

Further, the present invention provides a non-halogen flame retardant bridging insulated electric wire characterized in that the thickness of the insulating outer layer is 50 to 500 탆.

The present invention also provides a halogen-free flame retardant crosslinked insulated electric wire, characterized in that the flame retardant includes magnesium hydroxide (Mg (OH) ₂ ) or aluminum hydroxide (Al (OH) ₃ ).

Further, the flame retardant is surface-treated with at least one surface modifier selected from the group consisting of vinyl silane, titanate-based coupling agent, stearic acid, oleic acid and aminopolysiloxane.

On the other hand, the non-halogen flame retardant crosslinked insulated electric wire is characterized in that the crosslinking is a number crossing.

The present invention also provides a halogen-free flame-retardant crosslinked insulated electric wire, characterized in that the base resin comprises a polyolefin-based resin and a polyolefin elastomer.

The present invention provides a halogen-free flame-retardant crosslinked insulated wire, wherein the polyolefin-based resin comprises low-density polyethylene (LDPE).

The present invention also provides a halogen-free flame-retardant crosslinked insulated wire characterized in that the content of the polyolefin-based resin is 25 to 70 parts by weight based on 100 parts by weight of the base resin.

On the other hand, the antioxidant provides a halogen-free flame-retardant crosslinked insulated electric wire, which comprises a phenol-based, amine-based, quinone-based antioxidant, or a combination thereof.

The non-halogen flame retardant crosslinked insulated wire according to claim 1, wherein the antioxidant is 0.05 to 5 parts by weight based on 100 parts by weight of the base resin.

The present invention also provides a halogen-free flame-retardant bridging insulating wire, wherein the insulating composition comprises at least one internal lubricant selected from the group consisting of paraffin wax and olefin wax.

Here, the content of the internal lubricant is 0.3 to 7 parts by weight based on 100 parts by weight of the base resin, and provides the halogen-free flame-retardant crosslinked insulated wire.

The external lubricant may include at least one external lubricant selected from the group consisting of a fatty acid series, a fatty acid salt, a fatty acid amide, a silicone lubricant and a special grade wax.

Also, the content of the external lubricant is 0.3 to 5 parts by weight based on 100 parts by weight of the base resin, and the non-halogen flame retardant crosslinked insulated wire is provided.

The insulating composition further comprises 0.5 to 5 parts by weight of a pigment based on 100 parts by weight of the base resin.

Further, the insulating composition comprises 0.5 to 5 parts by weight of a crosslinking agent based on 100 parts by weight of the base resin, and provides the halogen-free flame-retardant crosslinked insulated electric wire.

Here, the crosslinking agent may be an organic silane such as vinyltrimethoxysilane, vinyltriethoxysilane or vinyltrimethoxyethoxysilane; And dicumyl peroxide, benzoyl peroxide, lauryl peroxide, t-butyl cumyl peroxide, di (t-butylperoxyisopropyl) benzene, 2,5-dimethyl- ) Hexane or an organic peroxide-based cross-linking agent of di-t-butyl peroxide. The present invention also provides a halogen-free flame retardant crosslinked insulated electric wire.

In addition, the insulating composition may include metal carboxylates of dibutyltin dilaurate, tin octoate, tin acetate, lead naphthenate or zinc octoate; Organometallic compounds of titanium esters and chelates or tetrabutyl titanate; Organic bases of ethylamine, hexylamine or piperidine; Or at least one condensation catalyst selected from the group consisting of a mineral acid or an acid of a fatty acid.

And a total content of the inner lubricant and the outer lubricant is higher in the insulating outer layer than in the insulating inner layer.

On the other hand, as a non-halogen flame retardant crosslinked insulated electric wire for indoor wiring, a conductor; And an insulation layer surrounding the conductor and having a number of insulating compositions including a halogen-free resin as a base resin, the insulation composition further comprising an antioxidant, a flame retardant, a pigment, and an external lubricant, Wherein the antioxidant has a melting point of not higher than the crosslinking temperature of the insulating layer + 5 DEG C and the external lubricant and the pigment are contained in a region of 50 to 500 mu m in thickness from the surface of the insulating layer, (Mg (OH) ₂ ) or aluminum hydroxide (Al (OH) ₃ ) surface-treated with at least one surface modifying agent selected from the group consisting of a nitrate-based coupling agent, stearic acid, oleic acid and aminopolysiloxane, Is 100 to 180 parts by weight based on 100 parts by weight of the base resin.

Further, as a non-halogen flame retardant bridging insulated electric wire for indoor wiring, a conductor; And an insulating layer surrounding the conductor and formed by crosslinking an insulating composition comprising a halogen-free resin as a base resin, wherein the insulating composition further comprises an antioxidant, a flame retardant, a pigment, and an external lubricant, Wherein the antioxidant has a melting point of 90 占 폚 or less and the external lubricant and the pigment are contained in a region radially inwardly from the surface of the insulating layer in a range of 50 to 500 占 퐉.

Here, the flame retardant may be magnesium hydroxide (Mg (OH) ₂ ) or aluminum hydroxide (Al (OH) ₂ ) surface-treated with at least one surface modifier selected from the group consisting of vinylsilane, titanate-based coupling agent, stearic acid, oleic acid and aminopolysiloxane ) ₃ ), and the content of the flame retardant is 100 to 180 parts by weight based on 100 parts by weight of the base resin.

Also, the antioxidant is a phenol-based, amine-based, quinone-based antioxidant, or a combination thereof, and is contained in an amount of 0.05 to 5 parts by weight based on 100 parts by weight of the base resin. Provides an insulated wire.

The external lubricant may include at least one selected from the group consisting of a fatty acid series, a fatty acid salt, a fatty acid amide, a silicone lubricant and a special grade wax. The content of the external lubricant may be 0.3 to 10 Halogen-free flame-retardant bridged insulated electric wire.

Further, the content of the pigment is 0.5 to 5 parts by weight based on 100 parts by weight of the base resin, and provides the halogen-free flame-retardant crosslinked insulated wire.

Also, the insulating composition may include at least one internal lubricant selected from the group consisting of paraffin wax and olefin ga wax, and the content of the internal lubricant is 0.3 to 7 parts by weight based on 100 parts by weight of the base resin. , Non-halogen flame-retardant bridged insulated wires.

The insulating composition includes 0.5 to 5 parts by weight of a crosslinking agent based on 100 parts by weight of the base resin, and the crosslinking agent is selected from the group consisting of vinyltrimethoxysilane, vinyltriethoxysilane or vinyltrimethoxyethoxysilane organosilane; And dicumyl peroxide, benzoyl peroxide, lauryl peroxide, t-butyl cumyl peroxide, di (t-butylperoxyisopropyl) benzene, 2,5-dimethyl- ) Hexane or an organic peroxide-based cross-linking agent of di-t-butyl peroxide. The present invention also provides a halogen-free flame retardant crosslinked insulated electric wire.

Further, the base resin may include a polyolefin resin and a polyolefin elastomer, the polyolefin resin may include low density polyethylene (LDPE), and the content of the polyolefin resin may be 25 to 70 parts by weight based on 100 parts by weight of the base resin. Based flame retardant insulated wire.

1 is a cross-sectional view schematically showing a cross-sectional structure of a non-halogen flame retardant polyolefin bridged insulated electric wire according to an embodiment of the present invention.
2 is a cross-sectional view schematically showing a cross-sectional structure of a non-halogen flame retardant polyolefin bridged insulated electric wire according to another embodiment of the present invention.
3 is a cross-sectional view schematically showing a cross-sectional structure of a non-halogen flame retardant polyolefin bridged insulated electric wire according to another embodiment of the present invention.
FIG. 4 is a schematic view of a virtual installation work environment for evaluating the non-halogen flame retardant polyolefin bridging insulation wire according to the present invention.
FIG. 5 is a schematic view showing a virtual installation work environment for measuring a static friction coefficient of a halogen-free flame-retardant polyolefin bridged insulated electric wire according to the present invention.
FIG. 6 is a schematic view of another hypothetical work environment for measuring the static friction coefficient and the coefficient of dynamic friction of the halogen-free flame-retardant polyolefin bridged insulated wire according to the present invention.
FIG. 7 is a schematic view showing a bundle of non-halogen flame retardant polyolefin bridged insulated electric wires according to the present invention and 100 bundles packaged therein.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

1 is a cross-sectional view schematically showing a cross-sectional structure of a non-halogen flame retardant polyolefin bridged insulated electric wire according to an embodiment of the present invention. As shown in FIG. 1A, the non-halogen flame-retardant polyolefin bridged insulated wire according to the present invention may comprise a conductor 10 and an insulating layer 20 surrounding the conductor 10. 1B, the non-halogen flame retardant polyolefin bridged insulated electric wire according to the present invention may further include a separate insulating layer 30 at the periphery of the insulating layer 20, Layer 20 may be an insulating inner layer and the outer insulating layer 30 may be an insulating outer layer.

The conductor 10 may be made of a conductive metal such as copper or aluminum, and may be made of copper. The conductor 10 may be a single wire as shown in Figs. 1A and 1B, or may be a twisted wire obtained by twisting a plurality of, e.g., 7 or 19, single wires as shown in Fig. 1C, Halogen-free flame-retardant polyolefin bridged insulated electric wire used as the non-halogen flame-retardant polyolefin cross-linked insulated wire is preferably twisted in terms of flexibility in comparison with disconnection.

The conductor 10 has a diameter determined according to the rated voltage of the halogen-free flame-retardant polyolefin bridged insulated electric wire. For example, a conductor used for a halogen-free flame retardant polyolefin bridged insulated wire for indoor wiring at a rated voltage of 450/750 V 10 may have a nominal cross-sectional area of about 1.5 to 10 mm 2 for a single line and a diameter of about 0.53 to 1.35 mm for a strand of small bow 7, and a nominal cross-sectional area of 1.5 to 300 SQ, .

The non-halogen flame retardant polyolefin bridged insulated electric wire according to the present invention is used when it is used for indoor wiring such as electric lamps, electric heating lamps, etc., And the electric wire drawn to the inside of the ceiling, the wall, and the floor is made of a material such as PVC, which protects the electric wire and guides the electric wire until the electric wire is pulled out. It is transported through a conduit.

If the flexibility of the wire to be conveyed through the conduit is excessively excessive or its stiffness is excessively large, it may be difficult to transfer the wire, and also by friction with the inner wall of the conduit or other wires Transport can be difficult. Particularly, when the electric wire is transported through the conduit in a curved region according to the structure of a building, a ceiling of a facility, a wall, a floor, and the like, further transportation may be difficult.

Therefore, when the halogen-free flame-retardant polyolefin bridged insulated wire according to the present invention is used for indoor wiring, it is required to balance the flexibility and stiffness accurately controlled in order to ensure excellent installation property, Based flame retardant polyolefin bridged insulated wire is determined by the elasticity of the non-halogen flame retardant polyolefin bridged insulated wire.

The elasticity of the non-halogen flame retardant polyolefin bridging insulating wire is determined by the modulus of elasticity of the conductor 10 and the insulating layer 20 constituting the non-halogen flame retardant polyolefin bridging insulating wire. Since the modulus of elasticity is very small compared with the modulus of elasticity of the conductor 10, the elastic force of the non-halogen flame retardant polyolefin bridged insulated wire is predominantly determined by the modulus of elasticity of the conductor 10.

Therefore, in the halogen-based flame retardant polyolefin bridged insulated electric wire according to the present invention, when the halogen-free flame retardant polyolefin bridged insulated electric wire is used for indoor wiring, the modulus of elasticity of the conductor 10 for ensuring excellent installation property is about 15,000 21,000 MPa, preferably 17,000 to 18,000 MPa.

The insulating layer 20 may be formed by extrusion of an insulating composition. The insulating composition may include an electrically insulating polymer resin as a base resin, an antioxidant for suppressing the oxidation of the polymer resin, an internal lubricant for improving the compatibility of the polymer resin and the additive, a flame retardant for realizing flame retardancy of the cable, and the like .

Since the polymer resin is mostly an electrically insulating material, the electrically insulating polymer resin is not particularly limited if it satisfies the basic physical properties required for an insulating layer of a cable used for indoor wiring and the like. The electrically insulating polymer resin may be, for example, a polyolefin resin such as polyethylene, polypropylene and the like, preferably polyethylene.

The polyethylene may be an ultra low density polyethylene (ULDPE), a low density polyethylene (LDPE), a linear low density polyethylene (LLDPE), a medium density polyethylene (MDPE), a high density polyethylene (HDPE), or a combination thereof. And may be low-density polyethylene (LDPE) in terms of forming an insulating layer of the polyolefin bridged insulated electric wire. The polyethylene may be a homopolymer, a random or block copolymer of ethylene and an? -Olefin such as propylene, 1-butene, 1-pentene, 1-hexene or 1-octene, or a combination thereof.

Since the low density polyethylene (LDPE) has a lower crystallinity than other polyethylene, it has excellent loading properties for additives such as a flame retardant and is produced without using a catalyst unlike other polyethylene. It is even better.

The insulating composition may include a polyolefin elastomer (POE) such as propylene-ethylene rubber (EPR) and propylene-ethylene-diene rubber (EPDM), a styrene- Styrene-butadiene rubber (SBR) such as styrene-ethylene-ethylene-propylene-styrene copolymer and styrene-butylene-styrene copolymer, ethylene vinyl acetate (EVA) (about 15 to 40% by weight of vinyl acetate) As shown in FIG.

The polyolefin elastomer, styrene butadiene rubber (SBR), ethylene vinyl acetate (EVA) and the like (hereinafter referred to as " polyolefin elastomer ") has poor mechanical properties and low melting point as compared with the polyolefin, The degree of crystallinity is low, which improves loading properties for additives such as flame retardants. Thus, the polyolefin elastomer or the like can further improve the flexibility, bending property, impact resistance, cold resistance, etc. of the insulating layer 20 formed by the insulating composition.

When the total heat absorbing amount required for melting the base resin is about 30 to < RTI ID = 80 J / g. Here, when the total endothermic amount required for melting the base resin is less than about 30 J / g, the heat resistance of the insulating composition may be poor, while about 80 J / g, the flexibility, elongation percentage, etc. of the insulating composition may be insufficient.

The blending ratio of the polyolefin resin and the polyolefin elastomer contained as the base resin of the insulating composition is not particularly limited and may be appropriately selected within a range satisfying physical properties such as the later-described insulation property of the insulating composition, , The content of the polyolefin resin may be 25 to 70 parts by weight based on 100 parts by weight of the base resin.

If the content of the polyolefin resin is less than 25 parts by weight, the mechanical properties and heat resistance of the insulating layer may be lowered. On the other hand, when the amount of the polyolefin resin is more than 70 parts by weight, the compatibility of the insulating composition and the flame retardant may be greatly reduced.

In the non-halogen-based flame-retardant polyolefin-crosslinked insulated wire according to the present invention, the insulation composition for forming the insulating layers 20 and 30, for example, magnesium hydroxide (Mg (OH) _2), aluminum hydroxide (Al (OH) ₃ ) Or a nitrogen-based flame retardant such as melamine resin, melamine cyanurate and the like, preferably magnesium hydroxide (Mg (OH) ₂ ).

As the flame retardant, magnesium hydroxide (Mg (OH) ₂ ) in the metal hydroxide flame retardant is superior in heat resistance to other metal hydroxide flame retardants, and suppresses the generation of bubbles even in heat generation due to high-speed extrusion of the insulating layers 20, Can be suppressed. In addition, magnesium hydroxide (Mg (OH) ₂ ) as a flame retardant can stably form a charge when the insulating layers 20 and 30 are burned in the event of a fire, so that the insulating function can be maintained in place of the buried insulating layer .

In general, inorganic particles such as magnesium hydroxide as the flame retardant are hydrophilic with high surface energy, whereas base resins such as polyolefin have hydrophobic properties with low surface energy, so that the inorganic particles have poor dispersibility with respect to the base resin And the electrical characteristics may be adversely affected. Therefore, in order to solve such a problem, inorganic particles such as magnesium oxide can be surface-treated with vinylsilane, stearic acid, oleic acid, aminopolysiloxane, titanate-based coupling agent and the like, preferably surface-treated with vinylsilane .

When the inorganic particles are surface-treated with vinylsilane or the like, an alkoxy group such as vinylsilane is attached by chemical bonding or physical bonding to the surface of inorganic particles such as magnesium hydroxide by hydrolysis and condensation reaction, and the surface- The particles react with the base resin to ensure excellent dispersibility.

Particularly, the vinyl silane as the surface treatment agent for the inorganic particles is excellent in the effect of improving the dispersibility of the inorganic particles as compared with other surface treatment agents, and further, the number of the insulating compositions does not deteriorate the cross- , 30 in terms of realizing a stable insulation resistance. The advantages of vinylsilane as a surface treatment agent for the inorganic particles, in particular, the stable insulation resistance of the insulating layers 20 and 30 can be achieved by the polar group possessed by the external activator described later, May be more important in terms of offsetting the problem that may be degraded.

The content of the flame retardant may be a sufficient flame retardancy of the insulating composition, for example, a flame retardancy that satisfies the standard KS C 60332-1. For example, the content may be about 100 To 180 parts by weight. If the content of the flame retardant is less than about 100 parts by weight, the flame retardancy of the insulating composition may be insufficient, while if it exceeds about 180 parts by weight, the molding processability such as flexibility, elongation, .

On the other hand, when inorganic particles such as magnesium hydroxide and aluminum hydroxide are included in the insulating composition forming the insulating layer 20 as a flame retardant, temperature control during extrusion for forming the insulating layer 20 is very important, The temperature is preferably maintained at about 150 < 0 > C or lower. If the extrusion temperature is excessively high, the surface smoothness and physical properties of the insulating layer 20 may be deteriorated due to the dehydration process.

In the non-halogen flame retardant polyolefin crosslinked insulated wire according to the present invention, the insulating composition forming the insulating layer 20 includes a crosslinking agent, so that the insulating layer 20 can be made of a crosslinked polyolefin (XLPO). The crosslinking method of the crosslinked polyolefin (XLPO) forming the insulating layer 20 is not particularly limited. For example, the crosslinking polyolefin (XLPO) is formed by continuously extruding the polyolefin in a short time in the high- A crosslinking chemical crosslinking method, a water crosslinking method in which polyolefin is crosslinked at a low temperature and a pressure for a long time after extrusion molding of an insulating layer, and an irradiation crosslinking method in which polyolefin is crosslinked by separate electron irradiation after extrusion molding.

However, as the crosslinking method of the crosslinked polyolefin (XLPO), there is a problem that crosslinking is performed in a high-temperature and high-pressure steam tube of a crosslinking method, and thus additional facilities and cost are required. In the irradiation crosslinking method, There is a problem in that the water exchange method is preferable.

The cross-linking agent may be an organosilane such as vinyltrimethoxysilane, vinyltriethoxysilane, or vinyltrimethoxyethoxysilane, preferably having high reactivity, so that crosslinking efficiency Particularly preferred vinyltrimethoxysilane, or in the case of the chemical crosslinking method, dicumylperoxide, benzoylperoxide, laurylperoxide, t-butylcumylperoxide, di (t-butylperoxyisopropyl) Organic peroxide-based cross-linking agents such as dimethyl-2,5-di (t-butylperoxy) hexane and di-t-butyl peroxide, preferably dicumyl peroxide with low cost and excellent crosslinking efficiency.

In particular, when the crosslinking agent is an organosilane such as vinyltrimethoxysilane, the base resin grafts vinylsilane through reaction with the crosslinking agent and is exposed to moisture or moisture in the presence of a condensation catalyst, . Thus, the insulating composition may further comprise a suitable condensation catalyst for the number of the base resins.

The condensation catalyst may be selected from metal carboxylates such as dibutyltin dilaurate, tin octoate, tin acetate, lead naphthenate and zinc octoate, titanium esters and chelates, organometallic compounds such as tetrabutyl titanate, , Hexylamine, piperidine and the like, or acids such as mineral acids and fatty acids, and the content of the condensation catalyst may be 0.01 to 0.2 parts by weight based on 100 parts by weight of the base resin.

The content of the crosslinking agent may be selected so that the gel fraction of the insulating composition after crosslinking is 50 to 90%. If the gel fraction of the insulating composition after crosslinking is less than 50%, the heat resistance, hotset, etc. of the insulating composition may be insufficient due to insufficient degree of crosslinking, whereas when the gel fraction is more than 90% Scorch due to premature crosslinking can occur. The content of the crosslinking agent may be, for example, 0.5 to 5 parts by weight based on 100 parts by weight of the base resin.

In the non-halogen flame-retardant polyolefin bridged insulated electric wire according to the present invention, the insulating composition for forming the insulating layer 20 may contain other additives such as antioxidants, internal lubricants, moisture absorbers, processing stabilizers, heavy metal deactivators, foaming agents, It may further comprise an additive.

The antioxidant functions to inhibit the oxidation of the polymer resin contained in the insulating composition and may be used as an antioxidant such as phenol, amine or quinone, preferably a phenol antioxidant or an amine-based antioxidant And may contain an inhibitor. Here, the phenolic antioxidant as the antioxidant is more effective in suppressing discoloration of the internal lubricant and the like in the insulating composition, and the amine antioxidant further improves the insulation resistance of the insulating layer formed by the insulating composition .

The solubility of the antioxidant may vary greatly depending on the temperature of the insulating composition. Specifically, the lower the temperature of the insulating composition, the lower the solubility of the antioxidant. The solubility of the antioxidant is significantly lowered at the time of crosslinking at a relatively lower temperature than the extrusion temperature of the insulating composition after the extrusion, and the antioxidant is eluted to the surface of the insulating layers 20 and 30, It has been confirmed experimentally that blooming can be caused by elution.

In addition, the blooming phenomenon is particularly problematic when the insulating composition includes an external lubricant to be described later, because in the process of moving the external activator to the surface of the insulating layers 20 and 30 by its polar group, , Internal lubricants, and the like.

On the other hand, the present inventors have found that when the melting point of the antioxidant is lower than the crosslinking temperature of the insulating layer + 5 ° C or lower, preferably lower than the crosslinking temperature, the blooming phenomenon on the surface of the insulating layers 20 and 30 The present inventors have completed the present invention. Here, the crosslinking temperature of the insulating layer may be different depending on the crosslinking method of the insulating layer, and the crosslinking temperature may be about 70 to 100 占 폚 in the case of water crosslinking.

For example, when the melting point of the antioxidant is 90 ° C or lower and the melting point of the antioxidant is less than the crosslinking temperature of the insulating layer + 5 ° C, 20, and 30), the phase of the antioxidant is changed from a solid phase to a liquid phase at the time of crosslinking after the extrusion of the insulating composition, .

Accordingly, in the non-halogen flame-retardant polyolefin bridged insulating cable according to the present invention, the insulating composition forming the insulating layers 20 and 30 may include an antioxidant having a melting point lower than the crosslinking temperature of the insulating layers 20 and 30 have. The content of the antioxidant may be 0.05 to 5 parts by weight based on 100 parts by weight of the base resin. When the content of the antioxidant is less than 0.05 parts by weight, the antioxidant performance of the insulating layer is insufficient, while when it is more than 5 parts by weight, the antioxidant performance may converge and the insulation resistance may not be further improved.

The internal lubricant may include a paraffin wax or an olefin wax, or a fatty acid type, a fatty acid amide type, an ester type, a silicone type internal lubricant, etc. Preferably, the base lubricant is compatible with the olefinic resin An excellent paraffin wax or an olefin wax, and performs the function of improving the compatibility of the polymer resin contained in the insulating composition and other additives.

The content of the internal lubricant may be about 0.3 to 7 parts by weight based on 100 parts by weight of the base resin. When the content of the internal lubricant is less than about 0.3 part by weight, the compatibility of the polymer resin with other additives may be greatly lowered On the other hand, if it exceeds 7 parts by weight, the mechanical properties, heat resistance, etc. of the insulating layer formed by the insulating composition may be significantly lowered.

The moisture absorbent may be calcium oxide, calcium chloride, silica gel, activated alumina or the like, and absorbs moisture in the insulating composition to suppress the deterioration of physical properties due to bubbling during extrusion of the insulating composition. The amount of the moisture absorber may be about 0.1 to 3 parts by weight based on 100 parts by weight of the base resin. When the amount of the moisture absorber is less than 0.1 parts by weight, the effect of adding the moisture absorber may be insignificant. The electrical characteristics of the insulating composition may be deteriorated.

In the non-halogen flame retardant polyolefin bridged insulated electric wire according to the present invention, the insulating composition forming the insulating layer 20 or the insulating outer layer 30 may further include an external lubricant and a pigment. The external lubricant moves to the surface of the insulating layer (20,30) formed by the insulating composition by retaining a polar group in the molecular structure, thereby lowering the coefficient of friction of the surface to improve the inserting property of the insulated electric wire , And the pigment acts to impart color to the surface of the insulated electric wire.

1A, when the non-halogen flame retardant polyolefin bridging insulating wire according to the present invention includes only the insulating layer 20 and does not include the separate insulating outer layer 30, the insulating layer 20 ) May comprise the external lubricant and / or pigment at a specific thickness, e.g., 50 to 500 [mu] m, radially inwardly from the surface thereof.

1B, when the non-halogen flame-retardant polyolefin bridged insulated wire according to the present invention includes an insulating layer 20 and a separate insulating outer layer 30 disposed on the outer periphery of the insulating layer 20, 30) may contain the external lubricant and / or pigment.

The content of the external lubricant may be 0.3 to 10 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the base resin of the insulating layer 20 or the insulating composition forming the insulating outer layer 30, The content of the pigment may be 0.5 to 5 parts by weight.

If the content of the external lubricant is less than 0.3 parts by weight, the surface friction coefficient of the insulating layer 20 or the insulating outer layer 30 can not be sufficiently lowered. If the content of the external lubricant is more than 10 parts by weight, Which may result in uneven outer diameter in the extrusion process.

An external lubricant which reduces the coefficient of friction of the insulating layer 20 or the insulating outer layer 30 formed from the insulating composition and improves the laying performance of the electric wire including the insulating layer 20 and the insulating outer layer 30, May be added in a powdery or liquid state, and in order to further improve the compatibility with the base resin, a resin which is the same as or different from the base resin may be used as the main material of the vehicle, and external lubricants, pigments, It may be added in the form of a master batch which is a raw material in the form of pellets or the like which are concentrated and dispersed at a high concentration.

Here, the vehicle may be defined to include all components except for the principal component in the master batch. For example, in an external lubricant master batch, the vehicle includes all resins except for external lubricants, and other additives, and in the pigment master batch, the vehicle may be defined to include all resins except pigments and other additives.

The external lubricant may include, for example, a fatty acid, a fatty acid salt, a fatty acid amide, a silicone lubricant, a special grade wax and the like having a polar group such as a hydroxyl group (-OH) and a carboxyl group (-COOH) In addition to the function of lowering the coefficient of surface friction of the insulating layer 20 or the insulating outer layer 30, it is possible to further improve the elongation so that the breakage of the insulating layer 20 or the insulating outer layer 30 And further, the external lubricant further has a function of suppressing insulation breakdown due to permeation of water during the immersion of the non-halogen flame retardant polyolefin bridged insulated electric wire.

The external lubricant may be added in the form of a master batch to the insulating layer 20 or the insulating composition forming the insulating outer layer 30 or may be added directly. When the above-mentioned external activator is added in the form of a master batch, it may be included in the master batch in an amount of 40 to 60% by weight based on the total weight of the master batch. Also, the color master batch (CMB) may be in the form of a pellet, a plate, a flake, etc., and the concentration of the pigment based on the total weight of the pigment master batch is 20 To 70% by weight.

The content of the pigment may be 0.5 to 5 parts by weight, preferably 2 to 3 parts by weight based on 100 parts by weight of the base resin of the insulating layer 20 or the insulating composition forming the insulating outer layer 30. [

If the content of the pigment is less than 0.5 parts by weight, it may be difficult to realize a desired color of the insulating layer 20 or the insulating outer layer 30. On the other hand, if the content of the pigment exceeds 5 parts by weight, flame retardancy and UV stability of the wire may deteriorate And the unit cost of the insulated electric wire can be increased unnecessarily.

The non-halogen flame-retardant polyolefin bridged insulated wire according to the present invention has an insulating layer 20 and an insulating outer layer 30 in a region having a specific thickness from the surface of the insulating layer 20, The external lubricant and the pigment are contained in the insulating outer layer 30 so that a heterogeneous and unpredictable effect of remarkably lowering the surface friction coefficient of the insulating layer 20 or the insulating outer layer 30 can be obtained As a result, the non-halogen flame retardant polyolefin bridging insulating wire is greatly improved in the installation performance of the halogen-free flame-retardant polyolefin, and the content of the pigment for realizing a desired color of the wire is minimized, .

When the non-halogen flame-retardant polyolefin bridged insulated wire according to the present invention has a double structure of the insulating layer 20 and the insulating outer layer 30, the total thickness of the insulating layer 20 and the insulating outer layer 30 May be, for example, about 0.7 to 1.0 mm, depending on the conductor specification of the non-halogen flame retardant polyolefin bridged insulated wire, wherein the thickness of the insulating outer layer 30 may be about 50 to 500 [mu] m have.

In the present invention, when the thickness of the insulating layer (20) substantially including the external lubricant and the pigment or the thickness of the insulating outer layer (30) is less than about 50 탆, the insulating layer (20) In order to realize the color of the insulating layer, it is necessary to add an excessive amount of the pigment, and when the pigment is added in the form of a pigment master batch, the flame retardancy of the non-halogen flame retardant polyolefin bridged insulated electric wire may be deteriorated. On the other hand, when the thickness of the insulating layer 20 substantially including the external lubricant and the pigment or the thickness of the insulating outer layer 30 is more than about 500 탆, the color and physical properties of the intended insulating layer are also realized A large amount of external lubricants and pigments must be added in order to deteriorate the properties of the halogen-free flame retardant polyolefin bridged insulated electric wire.

In the non-halogen flame-retardant polyolefin bridged insulated electric wire according to the present invention, the insulating composition for forming the insulating outer layer 30 disposed on the outer periphery of the insulating layer 20 includes the insulating layer 20 and the insulating outer layer 30 , It is preferable to include the same base resin, flame retardant, crosslinking agent, and other additives as the above-mentioned insulating composition for forming the insulating layer 20 and to be crosslinked in the same manner .

2 is a cross-sectional view schematically showing a cross-sectional structure of a non-halogen flame retardant polyolefin bridged insulated electric wire according to another embodiment of the present invention. As shown in FIG. 2, the insulating layer 20 or the insulating outer layer 30 of the non-halogen flame-retardant polyolefin bridged insulated wire according to the present invention may have one or more protrusions 31. The projecting portion 31 may change the surface contact between the insulation layer 20 or the insulation outer layer 30 and the inner wall of the PVC conduit line during the laying process to a line contact so as to additionally provide the non-halogen flame retardant polyolefin cross- Can be improved.

The number of the projections 31 may be four as shown in FIG. 2A, five as shown in FIG. 2B, and nine as shown in FIG. 2C, and the number of the projections 31 and the number The arrangement can be appropriately selected by a person skilled in the art according to the specification of the halogen-free flame retardant polyolefin bridged insulated wire according to the present invention, the working conditions at the time of laying, and the like.

3 is a cross-sectional view schematically showing a cross-sectional structure of a non-halogen flame retardant polyolefin bridged insulated electric wire according to another embodiment of the present invention. As shown in FIG. 3, the non-halogen flame retardant polyolefin bridged insulated wire according to the present invention may be formed by integrally extruding a plurality of, for example, two or three conductors simultaneously. In this case, when a plurality of electric wires are laid together, it is possible to solve the problem that the installation property is lowered due to the friction between adjacent electric wires, and also the insulating layer 20 or the insulating outer layer 30 integrally formed with one or more protrusions 31 Halogen-based flame retardant polyolefin bridged insulated electric wire and the PVC conduit inner wall is changed to a line contact so that the non-halogen flame retardant polyolefin bridged insulated electric wire can be further improved in the installation property.

Fig. 4 is a schematic view showing a virtual installation work environment for evaluating the non-halogen flame retardant polyolefin bridging insulation wire installation property.

As shown in FIG. 4, the virtual installation work environment has six bent portions bent at right angles and rounded at corners, and has a length of 1 m, a width of 9 m, and an inner diameter of 16 mm flame retardant polyolefin crosslinked insulated wire inserted into the PVC corrugated tube is pulled out together with a push-pull gauge at a 45 ° vertical upward direction from the one end of the PVC corrugated tube. , The tensile strength required for the non-halogen flame retardant polyolefin bridged insulated electric wire can be evaluated by measuring the tensile force required five times and calculating the average value thereof.

As a result of evaluating the non-halogen flame retardant polyolefin bridged insulated wire insulation under the hypothetical installation environment of several hundred times or more, the present inventors have confirmed that the above evaluation method most appropriately reflects the actual installation environment of the wire, The results of the evaluation of the durability of the concrete show very high reliability.

According to the method for evaluating the non-halogen flame retardant polyolefin bridging insulating wire (HFIX) under the virtual installation work environment as shown in Fig. 4, the installation property can be 1 to 11 kgf, and the above- Can be different. For example, with respect to three strands of a conductor having a conductor cross-sectional area of 1.5 mm < 2 >, the instability measured by the above evaluation method is 1 to 3 kgf, 2 to 6 kgf, and the two-wire strand having a conductor cross-sectional area of 4 mm < 2 > may have a settleability of 3 to 11 kgf as measured by the above evaluation method.

In this case, when the installation property according to the standard of the electric wire is below the reference value, the surface of the electric wire excessively slips more than necessary, and the packaging work for carrying the electric wire, that is, the electric wire bundle forming process is extremely difficult, It is impossible to form the wire with a height higher than a certain level, so that the efficiency of carrying the wire can be extremely reduced. On the other hand, when the installation property according to the standard of the wire exceeds the reference value, Can be inefficient.

FIG. 5 is a schematic view of a virtual installation work environment used in measurement of a static friction coefficient for evaluating the non-halogen flame retardant polyolefin bridged insulation wire for installation. Specifically, FIGS. 5A and 5B schematically show the virtual installation environment viewed from the side and the front, respectively.

As shown in Fig. 5, a hypothetical working environment was such that one strand of a conductor having a conductor cross-sectional area of 2.5 mm2 was placed in a semi-tubular structure having an inner diameter of 16 mm and made of steel, and then a load of 30 N It is possible to indirectly evaluate the installation property of the electric wire by measuring the static friction coefficient at the instant when the electric wire is pulled and moved in the direction of the structure.

As a result of measuring the coefficient of static friction of the non-halogen flame retardant polyolefin bridged insulated electric wire under a virtual installation environment of several hundred times or more, the present inventors found that the static friction coefficient of the electric wire measured by the above- , The static friction coefficient of the electric wire measured by the above evaluation method shows very high reliability.

The coefficient of static friction according to the method of evaluating the non-halogen flame retardant polyolefin bridged insulated wire under the virtual installation work environment as shown in Fig. 5 may be 1 or less, preferably 0.05 to 0.5.

If the static friction coefficient is less than 0.05, the surface of the electric wire excessively slips more than necessary, and it is extremely difficult to perform a packaging operation for carrying the electric wire, that is, to form a wire bundle. Particularly, The efficiency of transporting the electric wire can be extremely reduced. On the other hand, if the electric wire is more than 1, the electric wire can not be installed properly and the electric wire installation work may be inefficient.

6 is a schematic view showing another hypothetical installation work environment used for measuring static friction coefficient and dynamic friction coefficient for evaluating the non-halogen flame retardant polyolefin bridging insulating wire laying property.

As shown in FIG. 6, a specimen of a halogen-free flame-retardant polyolefin bridged insulated wire according to the present invention, having a length of 63 mm, was stretched in a predetermined size and weight, for example, 63 × 63 mm size and 200 g For example, 45 to 50 mm, so that the fixed specimen does not protrude out of the sliding piece, and the electric wire specimen is made of austenitic stainless steel (SUS304) material And a load of 800 g is further applied to the 200 g sliding piece so that a total load of 1 kg is applied to the two strands of the specimen. In this state, the sliding piece is placed on the friction material, When the sliding piece is moved on the friction material under normal temperature (25 ± 2 ° C) and normal humidity (45 ± 5% RH) It measures the power by calculating the coefficient of static friction of the wire samples for the to-be-laid friction material a spatial property of the wire can be evaluated by stitching.

As a result of measuring the coefficient of static friction of the non-halogen flame retardant polyolefin bridged insulated electric wire under a virtual installation environment of several hundred times or more, the present inventors found that the static friction coefficient of the electric wire measured by the above- , The static friction coefficient of the electric wire measured by the above evaluation method shows very high reliability.

Under a virtual installation work environment as shown in Fig. 6, the coefficient of static friction according to the method for evaluating the non-halogen flame-retardant polyolefin bridged insulated wire with respect to the method for laying the insulation can be 0.40 or less, preferably 0.35 or less. Here, if the static friction coefficient is more than 0.40, the installation of the electric wire is insufficient and the electric wire installation work may be inefficient.

The present invention relates to a bundle of the halogen-free flame retardant polyolefin bridged insulated electric wire, wherein Fig. 7a schematically shows one of the bundles of the electric wire, Fig. 7b shows the bundle of 100 electric wire bundles Which is a schematic view of packaging.

As shown in FIG. 7A, the bundle 100 of wires may be formed by winding the wire 110 into a cylinder having a constant outer diameter, and then separating the wire 110 from the cylinder. The bundle 100 of wires can be bound to four to six points by the tape 120 or the like so as to maintain the bundle shape even when separated from the cylinder.

Meanwhile, the non-halogen flame retardant polyolefin bridged insulated electric wire can be packaged and transported by stacking the electric wire bundles 100 shown in FIG. 7A on the pallet 200 as shown in FIG. 7B. When the electric wire bundles 100 are stacked on the pallet 200 in multiple stages, paper is inserted between the ends to increase the friction therebetween, or the multi-stacked electric wire bundles 100 are entirely wrapped with a heat shrinkable film or the like lapping) to maintain the packaged state. Here, the thickness of the heat-shrinkable film may be about 0.05 mm or more, preferably about 0.08 mm or more.

The electric wire 110 includes an external lubricant on the surface of the insulating layer 20 or the insulating layer 30 in order to realize a low static friction coefficient and a mounting property as the non-halogen flame-retardant polyolefin bridged insulating wire described above, And has a slippery characteristic.

When the surface of the insulating layer 20 or the insulating layer 30 has a slippery property, it is advantageous to install the electric wire including the electric wire. However, the packaging process of the electric wire for transporting the electric wire, So that it is extremely difficult to stack the electric wire bundles at a predetermined height, and thus the transportation efficiency is extremely reduced.

Therefore, the present inventors have found that the standard of the electric wire bundle, that is, the height (h) and the outer diameter (D) of the electric wire bundle can be calculated according to the following Equations 1 and 2 according to the standard of the electric wire, By satisfying the condition, it is possible to facilitate the packaging process of the electric wire and improve the transportation efficiency, thereby completing the invention relating to the electric wire bundle.

[Equation 1]

h = name

In the above equation (1)

a is from 20 to 50;

&Quot; (2) "

D = bh + c

In Equation (2)

b is from 0.4 to 0.6, and c is from 250 to 300.

For example, for a bundle of wires having a cross-sectional area d of 1.5 mm2, the height h may be 60 to 70 mm and the outer diameter D may be 290 to 310 mm, and the cross- d) the bundle of wires having a diameter of 2.5 mm 2 may have a height h of 75 to 85 mm and an outer diameter D of 300 to 320 mm and the bundle of wires having a cross sectional area d of 4 mm 2 The height h may be 100 to 110 mm and the outer diameter D may be 310 to 330 mm. When the bundle of wires has the above-described standard, as shown in FIG. 7B, when 100 bundles are packed, It is possible to maintain a stable state such that the bundles do not spread or collapse with each other, so that the packaging process of the electric wire is easy and the transportation efficiency can be improved.

[Example]

1. Evaluation of blooming phenomenon

(Width: 100 mm, length: 100 mm, thickness: 1.5 mm) and a cable specimen (outer diameter: 3.5 mm, inner diameter: 1.7 mm) of each of the examples and comparative examples as shown in Table 1 below, . Specifically, an insulating composition was prepared using a twin screw extruder, and the insulating sheet and the insulating layer were extruded at a temperature of 180 to 230 캜 at a retention time of not more than 5 minutes in the extruder, and crosslinked in a water bath at 70 to 85 캜 for 6 hours Samples of the insulation specimens and 2.5SQ non-halogen flame retardant polyolefin bridged insulated wires according to the examples and comparative examples, respectively, were produced. The unit of the content shown in Table 1 below is parts by weight.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Suzy 100 100 100 100 Flame retardant 150 150 150 150 Antioxidant 1 One One Antioxidant 2 One One Inner Bracers 1 3 3 Inner Bump 2 3 3 Condensation catalyst 6 6 6 6 Water condition 70 ℃, 6 hours 85 ℃, 6 hours 70 ℃, 6 hours 85 ℃, 6 hours

- Resin: Polyethylene

- Flame retardant: Magnesium hydroxide

- Antioxidant 1: Phenolic antioxidant (melting point: 110 to 125 ° C)

- Antioxidant 2: Phenolic antioxidant (melting point: 50 to 55 DEG C)

- internal lubricant 1: stearamide

- internal lubricant 2: polyethylene wax

- condensation catalyst: dibutyltin dilaurate master batch

The blooming phenomenon of the insulation specimens and the cable specimens according to each of the Examples and Comparative Examples prepared in the above Production Example was visually observed. When blooming phenomenon was observed, white powder components were analyzed by infrared analysis. The evaluation results are shown in Table 2 below.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Blooming phenomenon?
(Strong, medium, none) none none River medium White powder ingredient Phenolic antioxidant
Stearamide Phenolic antioxidant
Stearamide

As shown in Table 2, in the case of Comparative Examples 1 and 2, the antioxidant having a melting point lower than the crosslinking temperature in the range of 70 占 폚 or 85 占 폚, which is relatively lower than the temperature during extrusion after extruding the insulation sample and the cable insulation layer, It was confirmed that the blooming phenomenon that the resurfacer was eluted from the insulating specimen or the insulating layer was caused.

On the other hand, it was confirmed that Examples 1 and 2, in which the melting point of the antioxidant was controlled to be lower than the crosslinking temperature, suppressed the blooming phenomenon.

2. Estimation of settlement property and static friction coefficient

An insulating composition according to each of Examples and Comparative Examples was prepared at the components and mixing ratios shown in Table 3 below. Specifically, an insulating composition was prepared using a twin screw extruder, and the insulating inner layer and the insulating outer layer of the example and the insulating layer of the comparative example were respectively extruded at a temperature of 180 to 230 캜 within a retention time of 5 minutes or less in the extruder, To prepare insulating layer specimens and non-halogen flame retardant polyolefin crosslinked insulating wire specimens according to the examples and comparative examples, respectively. The unit of the content shown in Table 3 below is parts by weight.

Example Comparative Example 3 4 5 6 7 8 3 4 5 6 7 8 Conductor Sectional area 1.5SQ 2.5SQ 4SQ 1.5SQ 2.5SQ 4SQ Single / Stranded monorail Stranded wire monorail Stranded wire monorail Stranded wire monorail Stranded wire monorail Stranded wire monorail Stranded wire Isolation
Inner layer Resin 1 40 40 40 - - - Resin 2 60 60 60 - - - Resin 3 - - - 100 100 100 Cross-linking agent 1.3 1.3 1.3 1.3 1.3 1.3 Flame retardant 150 150 150 150 150 150 Antioxidant 0.07 0.07 0.07 0.07 0.07 0.07 Condensation catalyst 6 6 6 6 6 6 Isolation
Outer layer Resin 1 40 40 40 - - - Resin 2 60 60 60 - - - Cross-linking agent 1.3 1.3 1.3 - - - Flame retardant 150 150 150 - - - Antioxidant 0.07 0.07 0.07 - - - Condensation catalyst 6 6 6 - - - Pigment 2 2 2 - - - External lubricant 2 2 2 - - -

Stranded wire: Stranded wire of 7 wire strands

Resin 1: Low density polyethylene

Resin 2: Polyolefin elastomer

Resin 3: High density polyethylene

Crosslinking agent: vinyltrimethoxysilane

Flame retardant: Magnesium hydroxide

Antioxidants: Phenolic antioxidants

Condensation catalyst: dibutyl tin dilaurate

Pigment: Pigment Masterbatch (CMB)

Lubricant: Silicone master batch (SMB)

1) Estimation of putting property

(4SQ) or three strands (1.5SQ or 2.5SQ) of the HFIX specimen of each of the examples and comparative examples inserted in the PVC corrugated tube in the virtual installation work environment as shown in Fig. The pulling force of the wire was evaluated by repeatedly measuring the pulling force required for withdrawal by using a push-pull gauge at 45 ° vertically above the terminal and measuring the average value five times. The evaluation results are shown in Table 4 below.

2) Evaluation of static friction coefficient

The static friction coefficient at the moment when the electric wire is pulled in the direction of one side of the structure in a state where a load of 30 N is applied on the electric wire specimen of Example 5 disposed in the half tubular steel structure in the virtual installation work environment as shown in FIG. . The evaluation results are shown in Table 4 below.

6, static friction coefficients were evaluated for each of the wire specimens of Examples 3, 5, and 7 by using a Universal Testing Machine (manufacturer: Withlab, product name: WL2100) . Specifically, two strands of wire specimen of Example 3, 5 or 7 having a length of 63 mm were fixed to the bottom of a sliding piece having a size of 63 x 63 mm and a weight of 200 g at intervals of 45 mm, The sliding piece is placed on the friction material so as to contact the friction material of the austenitic stainless steel (SUS304), and a load of 800 g is further applied on the sliding piece, so that a total of 1 kg A static friction coefficient of the electric wire specimen with respect to the friction material was calculated by measuring a force required at the instant when the sliding piece started to move in the stop state when the sliding piece was moved on the friction material in a state of applying a load . The evaluation results are shown in Table 4 below. The coefficient of static friction shown in Table 4 below is the average of the results of three repeated experiments.

Example Comparative Example 3 4 5 6 7 8 3 4 5 6 7 8 Installability (kgf) 2.38 1.21 5.26 2.46 10.48 3.13 7.12 3.75 12.86 4.44 22 ↑ 7.25 Constant friction coefficient
(Fig. 5) - - 0.13 - - - - - - - - -
Static friction
6) Primary 0.348 - 0.382 - 0.339 - - - - - - - Secondary 0.351 0.388 0.342 Third 0.351 0.360 0.341 Average 0.35 0.38 0.34

As shown in Table 4, the electric wire specimen of the embodiment according to the present invention includes external lubricant in the insulated outer layer so that it can be installed at a level of 11 kgf or less for all the wire standards, 1 or less for a virtual installation environment shown in FIG. 5 The static friction coefficient and the static friction coefficient of 0.40 or less under another hypothetical installation environment shown in Fig. 6 were realized, and it was confirmed that excellent installation and workability were realized in actual installation environment. On the other hand, the 2.5 SQ disconnection conductor of Comparative Example 5 And the wire specimen including the 4 SQ single-wire conductor of Comparative Example 7 were found to have significantly lowered the durability.

3. Other properties evaluation

The following properties of the insulation layer specimen and the wire specimen of Example 5 were evaluated. The evaluation results are shown in Table 5 below.

1) Hot / Set evaluation

According to standard KS C 60811-2-1, an insulating layer according to Example 5 was weighed in a weight of about 70 mm in an oven at a temperature of 200 ° C. After 15 minutes, the increase rate and weight were removed and left in the oven for 5 minutes And the hot / set heat resistance was evaluated by measuring the rate of increase in length from the initial value after shrinking sufficiently at room temperature.

2) Evaluation of tensile strength / elongation at room temperature and after heating

The tensile strength and elongation at room temperature of the insulating layer specimen according to Example 5 were measured in accordance with Specification KS C 60811-1-2, and the tensile strength and elongation after storage in an oven at 135 ° C for 136 hours were measured, / Stretched ratio.

3) Evaluation of flame retardancy

After placing the wire specimen of Example 5 vertically in a chamber according to standard KS C 60332-1 and applying a flame to the wire specimen for about 1 minute in the direction of about 45 from the bottom, The flame retardancy was evaluated by measuring the length of the unburned portion when the flame was turned off.

4) Evaluation of insulation

A wire specimen of Example 5 having a length of about 15 m according to Specification KS C 3341 was placed in a water bath at 90 DEG C for 1 hour and a DC voltage was applied between the conductor of the wire specimen and the insulating layer at 500 V for 1 minute, The short-term insulation resistance was evaluated.

Further, the electric wire specimen according to Example 5 was stored in a water bath at 50 DEG C for one week, and then a voltage of 1.6 kV was applied for 4 hours. After that, the electric wire specimen was stored for one week in a water bath at 50 DEG C, , The long-term insulation resistance was evaluated by measuring the resistance of the insulating layer after applying the DC voltage at 500 V for 1 minute.

5) Evaluation of heat distortion

The thermal deformation was evaluated by measuring the rate of change in thickness by applying a constant load to the insulating layer specimen according to Example 5 at 90 캜 for 4 hours in accordance with Specification KS C 3341.

6) Cold resistance evaluation

The cold resistance was evaluated by measuring whether the wire specimen according to Example 5 was rolled in the reference rod for 4 hours at -15 ° C according to the standard KS C 3341 and whether the wire specimen was cracked due to the bending of the wire specimen and the low temperature .

7)

The degree of smoke generation was evaluated by measuring the generation of smoke by the light transparency of the smoke generated after the flame was generated in the bundle of wire specimens of Example 5 according to Specification KS C 3341.

8) Evaluation of oil resistance

The oil resistance was evaluated by measuring the reduction ratio of the tensile strength / elongation after changing the initial tensile strength and elongation from the initial value after immersing the insulating layer specimen according to Example 5 in IRM 902 oil at 70 占 폚.

Item unit Goal Value Example 5 Hot / Set % /% Below 100/15 75/0 (Room temperature) Tensile strength / elongation N / mm < 2 > /% 10/125 or higher 14.5 / 155 (Heating) Tensile strength / elongation N / mm < 2 > /% ± 30% or less of room temperature 27.8 / -13.7 Flammability mm Over 50 228 mm Short-time insulation resistance MΩkm 0.01 or more 185 Long-term insulation resistance MΩkm 3.67 or higher 10,470 Heating deformability % Less than 50 15.2 Cold resistance No crack No crack Superiority % 60 or more 91.9 Oil resistance % /% 20/40 or less 13.5 / 1.4

As shown in Table 5, it was confirmed that the non-halogen flame retardant polyolefin crosslinked insulated wire according to the present invention satisfies the target value by simultaneously improving heat resistance, mechanical properties, flame retardancy, insulation, cold resistance and oil resistance.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. You can do it. It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

10: conductor 20: insulating layer
30: Insulation outer layer

Claims (29)

Non-halogen flame retardant bridging insulating wire for indoor wiring,
Conductor; And
And an insulation layer surrounding the conductor and formed by crosslinking of an insulating composition containing a non-halogen resin as a base resin,
Wherein the insulating composition comprises an antioxidant and a flame retardant,
The antioxidant has a melting point of 90 DEG C or lower,
Wherein the insulating layer comprises an insulating inner layer and an insulating outer layer,
A non-halogen flame retardant crosslinked insulated wire, wherein the insulating outer layer further comprises a pigment for color rendering and an external activator for enhancing the durability. The method according to claim 1,
Wherein the content of the flame retardant is 100 to 180 parts by weight based on 100 parts by weight of the base resin. 3. The method according to claim 1 or 2,
Wherein the insulating outer layer has a thickness of 50 to 500 占 퐉. 3. The method according to claim 1 or 2,
Wherein the flame retardant is magnesium hydroxide (Mg (OH) ₂ ) or aluminum hydroxide (Al (OH) ₃ ). 3. The method according to claim 1 or 2,
Wherein the flame retardant is surface-treated with at least one surface modifier selected from the group consisting of vinyl silane, titanate-based coupling agent, stearic acid, oleic acid, and aminopolysiloxane. 3. The method according to claim 1 or 2,
Wherein the crosslinking is a number crossing. 3. The method according to claim 1 or 2,
Wherein the base resin comprises a polyolefin-based resin and a polyolefin elastomer. 8. The method of claim 7,
Wherein the polyolefin-based resin comprises low-density polyethylene (LDPE). 8. The method of claim 7,
Wherein the content of the polyolefin resin is 25 to 70 parts by weight based on 100 parts by weight of the base resin. 3. The method according to claim 1 or 2,
Wherein the antioxidant comprises a phenolic, amine, quinone antioxidant, or a combination thereof. 3. The method according to claim 1 or 2,
Wherein the content of the antioxidant is 0.05 to 5 parts by weight based on 100 parts by weight of the base resin. 3. The method according to claim 1 or 2,
Wherein said insulating composition comprises at least one internal lubricant selected from the group consisting of paraffin wax and olefin wax. 13. The method of claim 12,
Wherein the content of the internal lubricant is 0.3 to 7 parts by weight based on 100 parts by weight of the base resin. 3. The method according to claim 1 or 2,
Wherein said external lubricant comprises at least one external lubricant selected from the group consisting of fatty acid series, fatty acid salts, fatty acid amides, silicone lubricants and special grade waxes. 3. The method according to claim 1 or 2,
Wherein the content of the external lubricant is 0.3 to 5 parts by weight based on 100 parts by weight of the base resin. 3. The method according to claim 1 or 2,
Wherein said insulating composition further comprises 0.5 to 5 parts by weight of pigment based on 100 parts by weight of said base resin. 3. The method according to claim 1 or 2,
Wherein said insulating composition comprises 0.5 to 5 parts by weight of a crosslinking agent based on 100 parts by weight of said base resin. 18. The method of claim 17,
The cross-linking agent may be an organosilane such as vinyltrimethoxysilane, vinyltriethoxysilane or vinyltrimethoxyethoxysilane; And dicumyl peroxide, benzoyl peroxide, lauryl peroxide, t-butyl cumyl peroxide, di (t-butylperoxyisopropyl) benzene, 2,5-dimethyl- ) Hexane or an organic peroxide-based cross-linking agent of di-t-butyl peroxide. 3. The method according to claim 1 or 2,
Wherein the insulating composition is a metal carboxylate of dibutyltin dilaurate, tin octoate, tin acetate, lead naphthenate or zinc octoate; Organometallic compounds of titanium esters and chelates or tetrabutyl titanate; Organic bases of ethylamine, hexylamine or piperidine; Or at least one condensation catalyst selected from the group consisting of acids of inorganic or fatty acids. 13. The method of claim 12,
Wherein the total content of the internal lubricant and the external lubricant is greater in the insulating outer layer than in the insulating inner layer. Non-halogen flame retardant bridging insulating wire for indoor wiring,
Conductor; And
And an insulation layer surrounding the conductor and formed by bridging the number of the insulating composition including a halogen-free resin as a base resin,
Wherein the insulating composition further comprises an antioxidant, a flame retardant, a pigment, and an external lubricant,
Wherein the melting point of the antioxidant is not higher than the crosslinking temperature of the insulating layer + 5 DEG C,
Wherein the external lubricant and the pigment are included in a region having a thickness of 50 to 500 mu m from the surface of the insulating layer,
The flame retardant may be magnesium hydroxide (Mg (OH) ₂ ) or aluminum hydroxide (Al (OH) ₃ ) surface treated with at least one surface modifying agent selected from the group consisting of vinylsilane, titanate coupling agent, stearic acid, oleic acid and aminopolysiloxane ),
Wherein the content of the flame retardant is 100 to 180 parts by weight based on 100 parts by weight of the base resin. Non-halogen flame retardant bridging insulating wire for indoor wiring,
Conductor; And
And an insulation layer surrounding the conductor and formed by crosslinking of an insulating composition containing a non-halogen resin as a base resin,
Wherein the insulating composition further comprises an antioxidant, a flame retardant, a pigment, and an external lubricant,
The antioxidant has a melting point of 90 DEG C or lower,
Wherein the external lubricant and the pigment are contained in a region radially inwardly from the surface of the insulating layer in a range of 50 to 500 占 퐉. 23. The method of claim 22,
The flame retardant may be magnesium hydroxide (Mg (OH) ₂ ) or aluminum hydroxide (Al (OH) ₃ ) surface treated with at least one surface modifying agent selected from the group consisting of vinylsilane, titanate coupling agent, stearic acid, oleic acid and aminopolysiloxane ), And the content of the flame retardant is 100 to 180 parts by weight based on 100 parts by weight of the base resin. 24. The method according to claim 22 or 23,
Wherein the antioxidant is a phenol-based, amine-based, quinone-based antioxidant, or a combination thereof, and is contained in an amount of 0.05 to 5 parts by weight based on 100 parts by weight of the base resin. . 24. The method according to claim 22 or 23,
The external lubricant may include at least one selected from the group consisting of a fatty acid series, a fatty acid salt, a fatty acid amide, a silicone lubricant and a special grade wax, and the content of the external lubricant is 0.3 to 10 parts by weight based on 100 parts by weight of the base resin Wherein the halogen-free flame-retardant bridged insulated wire is characterized in that it is a halogen-free flame retardant insulated wire. 24. The method according to claim 22 or 23,
Wherein the content of the pigment is 0.5 to 5 parts by weight based on 100 parts by weight of the base resin. 24. The method according to claim 22 or 23,
Wherein the insulating composition comprises at least one internal lubricant selected from the group consisting of paraffin wax and olefin ga wax and the content of the internal lubricant is 0.3 to 7 parts by weight based on 100 parts by weight of the base resin. Halogen based flame retardant insulated wire. 24. The method according to claim 22 or 23,
Wherein the insulating composition comprises 0.5 to 5 parts by weight of a crosslinking agent based on 100 parts by weight of the base resin, wherein the crosslinking agent is selected from the group consisting of vinyltrimethoxysilane, vinyltriethoxysilane or vinyltrimethoxyethoxysilane organosilane; And dicumyl peroxide, benzoyl peroxide, lauryl peroxide, t-butyl cumyl peroxide, di (t-butylperoxyisopropyl) benzene, 2,5-dimethyl- ) Hexane or an organic peroxide-based cross-linking agent of di-t-butyl peroxide. 24. The method according to claim 22 or 23,
Wherein the base resin comprises a polyolefin resin and a polyolefin elastomer, the polyolefin resin includes low density polyethylene (LDPE), and the content of the polyolefin resin is 25 to 70 parts by weight based on 100 parts by weight of the base resin Non-halogen flame-retardant bridged insulated wire.

Images