KR101560997B1 - Halogen free flame-retardant crosslinked polyolefin insulation wire - Google Patents

Abstract

The present invention relates to a halogen-free flame-retardant polyolefin insulation wire, i.e., an HFIX wire. Specifically, the present invention relates to a halogen-free flame retardant polyolefin bridged insulated wire (HFIX wire) which is environmentally friendly, exhibits excellent flame retardancy and durability simultaneously, and reduces manufacturing cost.

Description

Halogen-free flame-retardant polyolefin insulation wire {

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 polyolefin bridged insulated wire which is environmentally friendly, has excellent flame retardancy and pourable properties, and satisfies both heat resistance, water resistance, insulation, cold resistance and oil resistance.

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.

Therefore, there is a serious demand for a wire for indoor wiring which is environmentally friendly, has excellent flame retardancy and excellent pavement properties, and can satisfy the characteristics of heat resistance, water resistance, insulation, cold resistance and oil resistance at the same time.

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.

Further, it is an 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.

In order to solve the above problems,

CLAIMS 1. A non-halogen flame retardant bridging insulated electric wire comprising a conductor and an insulation layer formed from an insulation composition that surrounds the conductor and contains a halogen-free resin as a base resin, wherein the insulation layer has a thickness of 50 to 500 mu m (6 mm) having rounded corners and bent at right angles and having a length of 1 m, a width of 9 m and an inner diameter of 16 mm by the shape having the bent portions Halogen-free flame-retardant bridging insulation having an average value of 10 kgf or less obtained by repeatedly measuring the tensile force required when pulling the three wires inserted in the corrugated pipe at the 45 ° vertical upward direction from the one end of the PVC corrugated pipe Provide wires.

The non-halogen flame retardant crosslinked insulated electric wire includes a conductor, an insulating layer, and an insulating outer layer surrounding the insulating layer, wherein the insulating layer and the insulating outer layer each independently comprise a halogen resin Wherein the insulating composition forming the insulating outer layer comprises a lubricant and has six bends bent at right angles and rounded at corners and having a length of 1 m and a width of 9 m, and a tensile strength required for withdrawing the three wires inserted in the polyvinyl chloride (PVC) corrugated tube having an inner diameter of 16 mm by pulling them together in the direction of 45 ° vertically above the end of the PVC corrugated tube, Halogen-free flame-retardant bridged insulated electric wire of 10 kgf or less.

Here, the non-halogen flame retardant bridging insulating wire is characterized in that the thickness of the insulating outer layer is 50 to 500 탆.

In addition, according to the standard KS C 60811-2-1, the weight of the insulating layer or the insulating outer layer is set to 70 mm in a 200 ° C oven. After 15 minutes, the increase rate of the increased length is 100% or less. After standing in a separate oven and sufficiently shrunk by cooling at room temperature, the rate of increase of the length from the initial value is 15% or less, the wire 250 mm is vertically positioned in the chamber according to the standard KS C 60332-1, The length of the unburned portion is 50 mm or more at the time when the flame is turned off when the flame of the electric wire itself rises upwards after the flame is applied to the electric wire for 1 minute, Wherein the tensile strength and the elongation after immersion in 902 oil are 20% and 40% or less, respectively, when the tensile strength and the elongation after the oil immersion are changed from the initial values are 20% It provides a bridge insulated wire.

The total amount of endothermic heat required for melting the non-halogen resin is 30 to 60 J / g, and the non-halogen resin has a gel fraction after crosslinking of 50 to 80%. The non-halogen flame retardant crosslinked insulation wire .

On the other hand, the lubricant includes at least one lubricant selected from the group consisting of fatty acid, fatty acid salt, fatty acid amide, silicone lubricant and wax, and the content of the lubricant is 1 to 10 parts by weight based on 100 parts by weight of the base resin Halogen-free flame-retardant bridged insulated wire.

The present invention also provides a halogen-free flame-retardant bridging insulating wire, wherein the insulating layer or the insulating composition forming the insulating outer layer further comprises 1 to 5 parts by weight of a pigment masterbatch based on 100 parts by weight of the base resin .

And, the elastic modulus of the conductor is 15,000 to 21,000 MPa, and the non-halogen flame retardant bridging insulated electric wire is provided.

Further, the base resin includes a polyolefin resin and a polyolefin elastomer, and the content of the polyolefin resin is 35 to 65 parts by weight, based on 100 parts by weight of the base resin, to provide a halogen-free flame retardant crosslinked insulated electric wire .

The insulating composition forming the insulating layer or the insulating outer layer may be at least one surface modifying agent selected from the group consisting of vinyl silane, stearic acid, oleic acid, aminopolysiloxane and titanate-based coupling agent based on 100 parts by weight of the base resin Halogen-free flame retardant bridging insulating wire characterized by comprising 150 to 180 parts by weight of a surface-treated flame retardant of magnesium hydroxide (Mg (OH) ₂ ) or aluminum hydroxide (Al (OH) ₃ ).

The insulating composition for forming the insulating layer or the insulating outer layer may be a silane crosslinking agent of vinyltrimethoxysilane, vinyltriethoxysilane or vinyltrimethoxyethoxysilane based on 100 parts by weight of the base resin, 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, based on the total weight of the flame retardant insulating wire.

The insulating composition for forming the insulating layer or the insulating outer layer may be a metal carboxylate of dibutyltin dilaurate, tin octoate, tin acetate, lead naphthenate or zinc octoate based on 100 parts by weight of the base resin, Rate; 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.

Furthermore, the insulating composition forming the insulating layer or the insulating outer layer, respectively, further comprises an additive for an antioxidant, a processing stabilizer, a heavy metal deactivator, a foaming agent or a polyfunctional monomer. The non-halogen flame- .

The present invention also provides a halogen-free flame-retardant bridging insulated electric wire, wherein the insulation layer or the insulation outer layer has one or more protrusions.

The non-halogen flame retardant polyolefin bridged insulated wire according to the present invention includes an insulating cover made of a non-halogen resin, so that it exhibits an environment-friendly effect that can avoid an environmental problem caused by a halogen resin.

In addition, the non-halogen flame retardant polyolefin bridged insulated wire according to the present invention has a trade-off between the flexibility and the stiffness of the conductor and the insulating layer, and the precise control of the surface friction coefficient of the insulating layer, off performance of the flame retardant and the pouring property can be improved at the same time.

Furthermore, the halogen-free flame retardant polyolefin bridged insulated wire according to the present invention minimizes the addition amount of CMB, thereby exhibiting an excellent effect that the characteristics of the wire such as heat resistance, water resistance, insulation, cold resistance and oil resistance can be satisfied at the same time.

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.

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 wire according to the present invention may further include a separate insulating layer 30 on the outer periphery of the insulating layer 20, (20) may be an insulating inner layer and the 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 wire, and about 0.53 to 1.35 mm for each wire of a small wire 7. In addition, the nominal cross-sectional area of the conductors 10 may be 1.5 to 300 SQ, especially 1.5 to 4 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 bridged insulated electric wire is determined by the elastic modulus of the conductor 10 and the insulating layers 20 and 30 constituting the non-halogen flame retardant polyolefin bridged insulated electric wire. The elastic modulus of the non-halogen flame retardant polyolefin bridging insulated electric wire is dominantly determined by the modulus of elasticity of the conductor 10 because the modulus of elasticity of the conductor 10 is very small compared to 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 and a flame retardant agent for flame retardant implementation of electric wires. 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 the insulating layer of the electric wire 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.

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, the styrene butadiene rubber (SBR), the ethylene vinyl acetate (EVA) and the like (hereinafter referred to as a 'polyolefin elastomer and the like') have flexibility, bendability, impact resistance, Cold resistance, heat resistance, and the like can be further improved.

The total endothermic amount required for melting the base resin may be about 30 to 60 J / g. If the total heat absorbing 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 if it is more than about 60 J / g, the flexibility, elongation, 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, , And the content of the polyolefin resin may be 35 to 65 parts by weight based on 100 parts by weight of the base resin.

In the non-halogen-based flame-retardant polyolefin-crosslinked insulated wire according to the present invention, the insulation of forming the insulating layer (20) composition, for example, magnesium hydroxide (Mg (OH) _2), aluminum hydroxide (Al (OH) _3), etc. Halogenated flame retardants such as melamine resin, melamine cyanurate, and other nitrogen-based flame retardants.

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 are preferably surface-treated with vinyl silane, stearic acid, oleic acid, aminopolysiloxane, titanate coupling agent and the like.

When the inorganic particles are surface-treated with vinyl silane or the like, a hydrolyzate such as vinyl silane is attached by chemical reaction to the surface of inorganic particles such as magnesium hydroxide by a condensation reaction, and the silane group reacts with the base resin, .

The content of the flame retardant may be a sufficient flame retardancy of the insulating composition, for example, a flame retardancy satisfying the standard KS C 60332-1, and may be, for example, about 150 To 180 parts by weight. When the content of the flame retardant is less than about 150 parts by weight, the flame retardancy of the insulating composition may be insufficient, while when it is more than 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.

The crosslinking agent may be a silane crosslinking agent such as vinyltrimethoxysilane, vinyltriethoxysilane or vinyltrimethoxyethoxysilane, or a crosslinking agent such as dicumylperoxide, benzoylperoxide, laurylperoxide di (t-butylperoxy) hexane, di-t-butyl peroxide and the like, such as t-butylcumylperoxide, di (t-butylperoxyisopropyl) benzene, 2,5- Based crosslinking agent.

In particular, when the crosslinking agent is a silane crosslinking agent such as vinyltrimethoxysilane, the base resin grafts vinyl silane through reaction with the crosslinking agent and is exposed to moisture or moisture in the presence of a condensation catalyst Can be crosslinked. 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 after crosslinking of the base resin is 50 to 80%. If the gel fraction of the base resin after crosslinking is less than 50%, the heat resistance of the insulating composition may be insufficient because of the insufficient degree of crosslinking, while when it exceeds 80%, the crosslinking degree is excessive, (scorch) may occur. The content of the crosslinking agent may be, for example, 0.5 to 2 parts by weight based on 100 parts by weight of the base resin.

In the halogen-free flame-retardant polyolefin bridged insulated electric wire according to the present invention, the insulating composition forming the insulating layer 20 further includes other additives such as an antioxidant, a processing stabilizer, a heavy metal deactivator, a foaming agent, and a polyfunctional monomer can do.

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) further comprises a color master batch (CMB) .

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 activator and / or pigment masterbatch at a certain thickness, for example from 50 to 500 mu m, 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 comprise the lubricant and / or pigment masterbatch.

A lubricant for lowering the coefficient of friction of the insulating layer 20 or the insulating outer layer 30 formed from the insulating composition and improving the laying performance of the electric wire including the insulating layer 20 and pigments for imparting a desired color thereto, It is difficult to mix it with the base resin constituting the direct insulating composition because it is in a powdery or liquid state and it is difficult to express a desired function and color due to defective dispersion in the lubricant, pigment and base resin.

Therefore, in order to solve such a problem, a master material, such as a pellet or the like, in which the same or different resin as the base resin to be mixed is used as the main raw material of the vehicle and in which a lubricant, a pigment, Batch can be used.

The lubricant may include a fatty acid, a fatty acid salt, a fatty acid amide, a silicone lubricant, a wax, and the like. In addition to the function of lowering the surface friction coefficient of the insulating layer 20 or the insulating outer layer 30, To avoid or minimize breakage of the insulating layer (20) or the insulating outer layer (30) in the bending region of the wire when bent. Further, since the lubricant is generally hydrophobic, the non-halogen flame retardant polyolefin bridged insulated wire Thereby further suppressing the dielectric breakdown caused by the dielectric breakdown.

The lubricant may be added to the insulating layer 20 or the insulating composition forming the insulating outer layer 30 in a masterbatch form or may be added directly. If the lubricant is added in the form of a masterbatch, it may be included in the masterbatch in an amount of 40 to 60% by weight based on the total weight of the masterbatch. The lubricant may be 1 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. [

If the content of the lubricant is less than 1 part by weight, the surface friction coefficient of the insulating layer 20 or the insulating outer layer 30 can not be sufficiently lowered. If the amount of the lubricant is more than 5 parts by weight, Resulting in uneven outer diameter in the extrusion process.

The pigment master batch (CMB) may be in the form of a pellet, a plate, a flake, etc., and the concentration of the pigment excluding the vehicle based on the total weight of the pigment master batch is 20 70% by weight. The pigment master batch (CMB) may be 1 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 masterbatch (CMB) is less than 1 part by weight, it may be difficult to realize the desired color of the insulating layer 20 or the insulating outer layer 30. On the other hand, if the content is more than 5 parts by weight, .

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, (CMB) is included in the insulating outer layer 30, it is possible to obtain a heterogeneous and predictive image that significantly reduces the surface friction coefficient of the insulating layer 20 or the insulating outer layer 30. Therefore, As a result, the non-halogen flame retardant polyolefin bridging insulated wire is greatly improved in the installation of the wire, and the content of the pigment masterbatch (CMB) for realizing a desired color of the wire is minimized, The decrease in flame retardancy due to the addition of the master batch (CMB) can be 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 lubricant and the pigment masterbatch or the thickness of the insulating outer layer (30) is less than about 50 탆, the insulating layer (20) In order to realize the hue of the insulating layer, the pigment masterbatch (CMB) must be added in an excessive amount, whereby the flame retardancy of the non-halogen flame retardant polyolefin bridged insulated electric wire may be lowered. On the other hand, when the thickness of the insulating layer 20 substantially including the lubricant and the pigment master batch or the thickness of the insulating outer layer 30 is greater than about 500 탆, the color and physical properties of the intended insulating layer are also realized It is necessary to add a large amount of a lubricant and a pigment master batch (CMB) in order to lower the physical 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.

[Example]

1. Manufacturing Example

Insulating compositions according to each of the examples and comparative examples were prepared at the components and mixing ratios shown in Table 1 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 according to Examples and Comparative Examples and 2.5SQ non-halogen flame retardant polyolefin crosslinked insulated wire samples. The unit of the content shown in Table 1 below is parts by weight.

Resin 1 Resin 2 Resin 3 Cross-linking agent Flame retardant Antioxidant Condensation catalyst Pigment Lubricant Example Insulated inner layer 40 60 1.3 150 0.07 6 Insulating outer layer 40 60 1.3 150 0.07 6 2 2 Comparative Example Insulating layer 100 1.3 150 0.07 6

Resin 1: Low density polyethylene

Resin 2: Polyolefin elastomer

Resin 3: High density polyethylene

Crosslinking agent: vinyltrimethoxysilane

Flame retardant: Magnesium hydroxide

Antioxidants: phenolic antioxidant wp

Condensation catalyst: dibutyl tin dilaurate

Pigment: Pigment Masterbatch (CMB)

Lubricant: Silicone master batch (SMB)

2. Property evaluation

Halogenated flame retardant polyolefin bridged insulated wire samples according to Examples and Comparative Examples were evaluated for the following properties, and in particular, the non-halogen flame retardant polyolefin bridged insulated wire samples according to Examples and Comparative Examples were evaluated, The results are shown in Tables 2 and 3 below.

1) Hot / Set evaluation

In accordance with the standard KS C 60811-2-1, a weight of a certain weight was applied to an insulating specimen of about 70 mm according to the example in an oven at 200 ° C. After 15 minutes, the increase rate and weight were removed, and the resultant was allowed to stand in an oven for 5 minutes, And the hot / set heat resistance was evaluated by measuring the increase rate of the length from the initial value after each shrinkage.

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

The tensile strength and elongation at room temperature of the insulating specimens according to the examples were measured according to the standard KS C 60811-1-2, and the tensile strength and elongation after storage at 135 ° C in an oven for 136 hours were measured. .

3) Evaluation of flame retardancy

Halogen flame retardant polyolefin bridging insulating wire samples according to the examples were placed vertically in the chamber according to the standard KS C 60332-1 and the flame was applied to the wire specimens in the direction of about 45 占 from the bottom for one minute, The flame retardancy was evaluated by measuring the length of the unburned portion at the time when the flame was turned off when the flame of the flame itself rose upward.

4) Evaluation of insulation

A non-halogen flame retardant polyolefin bridged insulating wire sample according to an embodiment of about 15 m length according to standard KS C 3341 was placed in a water bath at 90 ° C for 1 hour and the DC voltage between the conductor and the insulator of the wire sample was increased to 500 V The short-term insulation resistance was evaluated by measuring the resistance of the insulator after the application for a minute.

In addition, samples of non-halogen flame retardant polyolefin bridged insulated wires according to the examples were stored for 1 week in a water bath at 50 DEG C, then a voltage of 1.6 kV was applied for 4 hours, and then stored in a water bath at 50 DEG C for 1 week. The long-term insulation resistance was evaluated by applying a DC voltage between the conductor and the insulator of the sample for 1 minute at 500 V and measuring the resistance of the insulator.

5) Evaluation of heat distortion

The heating deformability was evaluated by measuring the rate of change of thickness by applying a constant load to the insulating specimen according to the example at 90 캜 for 4 hours in accordance with standard KS C 3341.

6) Cold resistance evaluation

Halogen flame retardant polyolefin crosslinked insulated wire according to Example according to standard KS C 3341 at -15 ° C for 4 hours while rotating the sample on the reference rod to see if the wire sample surface was cracked due to bending and low temperature The cold resistance was evaluated by measurement.

7)

The non-halogen flame retardant polyolefin crosslinked insulated wire samples of the examples according to the standard KS C 3341 were evaluated for their build-up resistance by measuring the degree of smoke generation by the light transparency of the smoke after generating flames in the sample bundle.

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 insulation sample according to the example in IRM 902 oil at 70 캜.

9) Estimation of putting property

4 schematically shows a virtual installation work environment for evaluating the non-halogen flame retardant polyolefin bridging insulation wire according to each of the examples and comparative examples. 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 together with a push-pull gauge at an angle of 45 ° vertically above the end of the PVC corrugated pipe The tensile strength was measured five times and the average value was calculated to evaluate the non-halogen flame retardant polyolefin bridged insulated wires. The tensile force is preferably 10 kgf or less, more preferably 5 kgf or less.

Item unit Goal Value Example 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 2, it was confirmed that the non-halogen flame retardant polyolefin crosslinked insulated wire according to the present invention satisfied the target value by simultaneously improving heat resistance, mechanical properties, flame retardancy, insulation, cold resistance and oil resistance.

Example Comparative Example Tensile force (kgf) 4 kgf 10.1 kgf

As shown in Table 3, the non-halogen flame-retardant polyolefin bridged insulated electric wire of the example according to the present invention has a double-layered insulating layer and excellent lubricity by including a lubricant in the outer layer of insulation, Based flame retardant polyolefin bridged insulated wire has been found to be poor in layability because the insulating layer of the single layer does not contain a lubricant.

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 (14)

As a non-halogen flame-retardant bridged insulated wire,
And an insulating layer formed from an insulating composition that surrounds the conductor and includes a halogen-free resin as a base resin,
Wherein the insulating layer comprises a lubricant in a range of 50 to 500 탆 in thickness from the surface thereof and 1 to 5 parts by weight of a pigment masterbatch based on 100 parts by weight of the base resin,
(PVC) corrugated pipe having six bends bent at right angles and bent at right angles and having a bend of 1 m in length, 9 m in width, and 16 mm in inner diameter, Halogen flame retardant crosslinked insulated wire having an average value of 10 kgf or less, measured repeatedly five times in a tensile force required when pulling together three strands at a 45 ° vertical upward direction from the one end of the PVC corrugated pipe. As non-halogen flame retardant bridging insulated wires,
A conductor, an insulating layer, and an insulating outer layer surrounding the insulating layer,
Wherein the insulating layer and the insulating outer layer are each formed from an insulating composition including a halogen resin as a base resin,
The thickness of the insulating outer layer is 50 to 500 탆,
Wherein the insulating composition forming the insulating outer layer comprises a lubricant and 1 to 5 parts by weight of a pigment masterbatch based on 100 parts by weight of the base resin,
(PVC) corrugated pipe having six bends bent at right angles and bent at right angles and having a bend of 1 m in length, 9 m in width, and 16 mm in inner diameter, Halogen flame retardant crosslinked insulated wire having an average value of 10 kgf or less, measured repeatedly five times in a tensile force required when pulling out the three strands at a 45 ° vertical upward direction from the one end of the PVC corrugated pipe. delete 3. The method according to claim 1 or 2,
According to the standard KS C 60811-2-1, the weight of the insulating layer or the insulating outer layer was set to 70 mm in a 200 ° C oven. After 15 minutes, the increase rate of the length was 100% or less. After removing the weight, , And the rate of increase of the length from the initial value after 15% or less of shrinkage by cooling sufficiently at room temperature,
After placing the wire 250 mm vertically in the chamber according to standard KS C 60332-1 and applying a flame to the wire in the direction of 45 ° from the bottom for one minute, when the flame of the wire itself rises upwards, The length of the unburned portion at the time when the flame is turned off is 50 mm or more,
Characterized in that the tensile strength and the elongation after immersing the electric wire in IRM 902 oil at 70 캜 are 20% and 40% or less, respectively, when the tensile strength and the elongation at the time of change from the initial value before oil immersion are 20% Isolated wires. 3. The method according to claim 1 or 2,
The total endothermic amount required for melting the halogen-free resin is 30 to 60 J / g,
Halogen-free flame retardant crosslinked insulated wire characterized in that the gel fraction of the non-halogen resin after crosslinking is 50 to 80%. 3. The method according to claim 1 or 2,
Wherein the lubricant comprises at least one lubricant selected from the group consisting of fatty acid, fatty acid salt, fatty acid amide, silicone lubricant and wax, and the lubricant is 1 to 10 parts by weight based on 100 parts by weight of the base resin Non-halogen flame-retardant bridged insulated wire. delete 3. The method according to claim 1 or 2,
Wherein the modulus of elasticity of the conductor is 15,000 to 21,000 MPa. 3. The method according to claim 1 or 2,
Wherein the base resin comprises a polyolefin resin and a polyolefin elastomer, and the content of the polyolefin resin is 35 to 65 parts by weight based on 100 parts by weight of the base resin. 3. The method according to claim 1 or 2,
The insulating composition forming the insulating layer or the insulating outer layer may be surface-treated with at least one surface modifier selected from the group consisting of vinylsilane, stearic acid, oleic acid, aminopolysiloxane and titanate-based coupling agent based on 100 parts by weight of the base resin Halogen-free flame-retardant bridged insulated wire characterized by comprising 150 to 180 parts by weight of a flame retardant of magnesium hydroxide (Mg (OH) ₂ ) or aluminum hydroxide (Al (OH) ₃ ) 3. The method according to claim 1 or 2,
Wherein the insulating composition forming the insulating layer or the insulating outer layer is a silane crosslinking agent of vinyltrimethoxysilane, vinyltriethoxysilane or vinyltrimethoxyethoxysilane based on 100 parts by weight of the base resin thereof; 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, based on the total weight of the flame retardant. 3. The method according to claim 1 or 2,
Wherein the insulating composition forming the insulating layer or the insulating outer layer is selected from the group consisting of metal carboxylates of dibutyltin dilaurate, tin octoate, tin acetate, lead naphthenate or zinc octoate based on 100 parts by weight of the base resin; 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 organic acids. 3. The method according to claim 1 or 2,
Wherein the insulating composition forming the insulating layer or the insulating outer layer further comprises an additive of an antioxidant, a processing stabilizer, a heavy metal deactivator, a blowing agent or a multifunctional monomer. 3. The method according to claim 1 or 2,
The non-halogen flame retardant bridging insulated wire according to any one of the preceding claims, wherein the insulation layer or the insulation outer layer has at least one protrusion.

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