KR102201364B1 - Flame-retardant polyolefin composition and CMP grade UTP cable including insulation prepared by the same - Google Patents

Abstract

The present invention relates to a Plenum-grade UTP (Unshielded Twisted Pair) cable comprising a flame-retardant polyolefin composition and an insulator formed therefrom, and at the same time, it is possible to impart a high flame retardancy of CMP (Communication Plenum) to a UTP cable, while providing sufficient electrical properties. Regarding a CMP grade UTP cable including an environmentally friendly flame-retardant polyolefin composition and an insulator formed therefrom without excessively increasing the thickness and volume of the cable, and reducing the manufacturing cost of the cable, even though it is exhibited. will be.

Description

CMP flame retardant grade UTP cable including flame-retardant polyolefin composition and insulator formed therefrom {Flame-retardant polyolefin composition and CMP grade UTP cable including insulation prepared by the same}

The present invention relates to a Plenum-grade UTP (Unshielded Twisted Pair) cable comprising a flame-retardant polyolefin composition and an insulator formed therefrom, and at the same time, it is possible to impart a high flame retardancy of CMP (Communication Plenum) to a UTP cable, while providing sufficient electrical properties. Regarding a CMP grade UTP cable including an environmentally friendly flame-retardant polyolefin composition and an insulator formed therefrom without excessively increasing the thickness and volume of the cable, and reducing the manufacturing cost of the cable, even though it is exhibited. will be.

UTP (Unshielded Twisted Pair) cable is a kind of signal line that connects the environment of a general telephone line or LAN. A plastic jacket is used to wrap the outside of a plurality of pair units made by twisting two insulated copper wires together. It is a name that means good.

FIG. 1 schematically shows a cross-sectional structure of a 4-pair UTP cable in which four pair units are wrapped with an outer jacket.

As shown in Fig. 1, the 4-pair UTP cable has a structure in which four pair units 100 are wrapped by one outer jacket 300. Here, each pair unit 100 is formed by twisting two conductive metal wires 111, preferably two conductive wires 110 insulated with an annealed copper wire, insulated with an insulator 112 at a predetermined pitch. .

In the conventional 4-pair UTP cable, in order to exhibit CMP-class flame retardancy, the insulator 112 is a polytetrafluoroethylene (PTFE) resin, a fluorinated ethylene propylene (FEP) resin, and a perfluorinated acid. ; It is made of fluororesin such as PFA).

Although the fluororesin has excellent flame retardancy and electrical properties, its high price increases the cost of the cable, and its processability is poor, such as high viscosity when melting, making it difficult to melt and mold. There is an unfriendly problem.

In order to solve such a problem of fluororesin, the insulator 112 constituting some of the pair units 100 among the plurality of pair units 100 is formed of fire-resistant polyethylene (FRPE) or flame-retardant polypropylene (Fire-resistant polypropylene). Resistant Polypropylene; FRPP), or a technology to replace the inner flame-retardant polyolefin with double insulation of the outer fluororesin has been developed.

However, since the conventional flame-retardant polyolefin material is a material in which a large amount of flame retardant and additives are mixed with a polyolefin resin, the dielectric constant and dielectric loss increase and the electrical properties are greatly degraded.To overcome this, the thickness and volume of the insulator are large compared to the fluororesin insulator. It increases and consequently leads to a decrease in the flame retardancy of the cable.

And, in the case of applying a conventional flame-retardant polyolefin material, it may be considered that the outer jacket 300 is made of a highly flame-retardant polyvinylchloride (PVC) material in order to minimize the deterioration of the flame retardancy, but this eventually increases the cable cost. There is a problem that causes.

Therefore, it is not environmentally friendly and secures high flame retardancy of CMP (Communication Plenum) grade without the use of expensive fluororesin, and does not excessively increase the thickness and volume of the cable despite satisfying sufficient electrical characteristics. However, there is an urgent need for a flame-retardant insulating material that can reduce the manufacturing cost of UTP cables, and a flame-retardant UTP cable including the insulator made by it, because it is not necessary to use expensive and high flame-retardant materials for the outer jacket due to sufficient flame retardancy. .

An object of the present invention is to provide a CMP-grade UTP cable comprising a flame-retardant polyolefin composition capable of imparting a high flame retardancy of a CMP (Communication Plenum) grade to a UTP cable and an insulator formed therefrom.

In addition, the present invention aims to provide a CMP-grade UTP cable comprising a flame-retardant polyolefin composition that does not excessively increase the thickness and volume of a cable despite exhibiting high flame retardancy and sufficient electrical properties at the same time, and an insulator formed therefrom. do.

Furthermore, the present invention is a CMP-grade UTP cable including a flame-retardant polyolefin composition that can reduce the manufacturing cost of a cable and an insulator formed therefrom because the insulator exhibits high flame retardancy and does not require the use of an expensive high flame retardant material for the outer jacket. It aims to provide.

In order to solve the above problems, the present invention,

100 parts by weight of a base resin including 50 to 90 parts by weight of a polyolefin resin and 10 to 50 parts by weight of a thermoplastic polyolefin elastomer resin; 50 to 150 parts by weight of a metal hydroxide flame retardant; And 5 to 100 parts by weight of a halogen-based or antimony-based flame retardant aid, a dielectric constant (@1 MHz) of 2.9 or less, a Limited Oxygen Index (LOI) of 30% or more, and smoke density measured according to ASTM E662 Is 500 or less, and a room temperature elongation of 100% or more and a room temperature tensile strength of 8.3 MPa or more, as measured according to UL444, to provide a flame-retardant polyolefin composition.

Here, the polyolefin resin is a polypropylene block copolymer, and the thermoplastic polyolefin elastomer resin is an ethylene propylene copolymer, providing a flame-retardant polyolefin composition.

In addition, the base resin provides a flame-retardant polyolefin composition, characterized in that it further comprises 2 to 10 parts by weight of a reactive polyolefin into which a polar group is introduced, based on a total of 100 parts by weight of the base resin.

In addition, the reactive polyolefin into which the polar group is introduced is a polypropylene grafted with maleic anhydride or glycidyl methacrylate. It provides a flame-retardant polyolefin composition.

On the other hand, the metal hydroxide flame retardant provides a flame-retardant polyolefin composition, characterized in that the surface is modified by silane or stearic acid magnesium hydroxide or aluminum hydroxide.

In addition, the flame-retardant auxiliary is a halogen-based flame-retardant auxiliary, and based on 100 parts by weight of the base resin, it provides a flame-retardant polyolefin composition comprising 30 to 100 parts by weight.

And, it provides a flame-retardant polyolefin composition, characterized in that the elongation residual and tensile residual after heating measured according to UL444 after heating at 100° C. for 2 days are 75% or more, respectively.

Furthermore, it provides a flame-retardant polyolefin composition, characterized in that it further comprises a lubricant, an antioxidant, a processing aid, or a combination thereof.

Meanwhile, a plurality of pair units formed by twisting a plurality of conductive wires including a conductor and an insulator surrounding the conductor with each other, and an outer jacket surrounding the plurality of pair units; The plurality of pair units provides a CMP flame-retardant grade UTP cable, characterized in that it comprises one or more first pair units formed by twisting a plurality of conductors including an insulator formed from the flame-retardant polyolefin composition.

Here, the plurality of pair units provides a CMP flame-retardant grade UTP cable, characterized in that it includes at least one second pair unit formed by twisting a plurality of conductive wires including an insulator formed from a fluororesin.

In addition, it provides a CMP flame retardant grade UTP cable, characterized in that the twist pitch of the first pair unit is 0.55 to 1.2 inches, the twist pitch of the second pair unit is 0.3 to 0.5 inches.

In addition, the second pair unit is one, the twist pitch of the second pair unit is shorter than the twist pitch of each of the plurality of first pair units, and the twist pitch of the conductor wire is the shortest among the plurality of first pair units. It provides a CMP flame-retardant grade UTP cable, characterized in that the one pair unit is disposed on the diagonally spaced apart from the second pair unit.

Furthermore, the first pair unit and the second pair unit are each two, the twist pitch of each of the second pair units is shorter than the twist pitch of each of the first pair units, and the two second pair units are the most It provides a CMP flame retardant grade UTP cable, characterized in that it is arranged in a spaced diagonal position.

On the other hand, the first pair unit is 4, the outer jacket is formed from a flame-retardant polyvinyl chloride resin composition, the flame-retardant polyvinyl chloride resin composition is polyvinyl chloride (PVC) having a polymerization degree of 1,000 to 1,700; A flame retardant comprising 10 to 30 parts by weight of a bromine flame retardant, 10 to 30 parts by weight of a phosphorus flame retardant, 50 to 110 parts by weight of aluminum hydroxide, and 10 to 20 parts by weight of magnesium hydroxide based on 100 parts by weight of the polyvinyl chloride (PVC); And a plasticizer comprising 10 to 30 parts by weight of a trimellitate-based plasticizer, 10 to 30 parts by weight of a brominated flame-retardant plasticizer, 10 to 30 parts by weight of a phosphorus-based flame-retardant plasticizer, and 5 to 20 parts by weight of an adipate-based cold-resistant plasticizer. It provides CMP flame retardant grade UTP cable.

Here, the flame-retardant polyvinyl chloride resin composition, based on 100 parts by weight of the polyvinyl chloride (PVC), zinc borate, sodium silicate, molybdenum compound, ammonium phosphate, ammonium carbonate, ammonium polyphosphate, red phosphorus, or a combination thereof It provides a CMP flame retardant grade UTP cable, characterized in that it further comprises 5 to 10 parts by weight of a flame retardant aid.

In addition, the bromine-based flame retardant is tetrabromophthalic anhydride, and the phosphorus-based flame retardant is triphenyl phosphate. It provides a CMP flame retardant grade UTP cable.

In addition, the flame retardant provides a CMP flame retardant grade UTP cable, characterized in that the surface is not modified.

On the other hand, it provides a CMP flame retardant grade UTP cable, characterized in that it further comprises a separator including a plurality of partition walls disposed between each of the plurality of pair units to maintain the arrangement of the plurality of pair units.

In addition, it provides a CMP flame retardant grade UTP cable, characterized in that it further comprises a lip cord to facilitate the stripping of the outer jacket.

The flame-retardant polyolefin composition according to the present invention exhibits high flame retardancy, but has an excellent effect of imparting high flame retardancy of CMP (Communication Plenum) grade to UTP cables by replacing conventional fluorine resins that are expensive, inferior in processability, and are not environmentally friendly. Show.

In addition, the flame-retardant polyolefin composition according to the present invention is environmentally friendly and does not emit harmful gases such as fluorinated gas in the event of incineration or fire of a flame-retardant UTP cable including an insulator made of the same, thereby reducing the cost of the UTP cable. It can show an excellent effect.

Furthermore, the flame-retardant polyolefin composition according to the present invention exhibits an excellent effect of not excessively increasing the thickness and volume of a cable including an insulator made of the flame-retardant polyolefin composition even though it simultaneously achieves sufficient flame retardancy and electrical properties.

1 schematically shows a cross-sectional structure of a 4-pair UTP cable wrapped in an outer jacket with four pair units.
2 schematically shows a cross-sectional structure of a CMP flame retardant grade UTP cable according to an embodiment of the present invention.
FIG. 3 schematically shows a longitudinal sectional structure of a CMP flame retardant grade 4-pair (FRPO: fluorine resin = 1:3) UTP cable according to an embodiment of the present invention.
FIG. 4 schematically shows a longitudinal sectional structure of a CMP flame retardant grade 4-pair (FRPO: fluorine resin = 2:2) UTP cable according to an embodiment of the present invention.
FIG. 5 schematically shows a longitudinal sectional structure of a CMP flame retardant grade 4-pair (FRPO: fluorine resin = 3: 1) UTP cable according to an embodiment of the present invention.
FIG. 6 schematically shows a longitudinal sectional structure of a CMP flame retardant grade 4-pair (FRPO: fluorine resin = 4:0) UTP cable according to an embodiment of the present invention.

Hereinafter, exemplary 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 and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

2 is a schematic cross-sectional view of a CMP flame retardant grade UTP cable according to an embodiment of the present invention.

As shown in Figure 2, the CMP flame retardant grade UTP cable according to the present invention is a plurality of conductive wires 110 formed by insulating a conductive metal wire 111 with an insulator 112, preferably two twisted to each other at a predetermined pitch. It includes a plurality of pair units 100 formed by a load and an outer jacket 300 surrounding the plurality of pair units 100.

The standards and materials of the conductive metal wire 111 comply with the UTP cable international standard (ANSI/TIA/EIA 568A). For example, the conductive metal wire 111 may be made of a material such as copper, annealed copper, tinned copper, or the like, and may be a solid wire or a stranded wire. , Preferably, it may be a twisted pair to improve the flexibility (flexibility) of the UTP cable. In addition, when the conductive metal wire 111 is a single wire, the outer diameter may be about 0.5 to 0.6 mm, and in the case of a stranded wire, the small wire diameter may be about 0.203 mm.

The insulator 112 constituting at least one pair unit 100 of the plurality of pair units 100 may be formed of a flame-retardant polyolefin (FRPO) resin composition, preferably a flame-retardant polypropylene (FRPP) resin composition.

The flame-retardant polyolefin composition may include, for example, a base resin, a flame retardant, a flame retardant auxiliary and other additives. Here, the base resin may include, for example, 50 to 90 parts by weight of a polyolefin resin and 10 to 50 parts by weight of a thermoplastic polyolefin elastomer resin, based on a total of 100 parts by weight. Preferably, 2 to 10 parts by weight of a reactive polyolefin into which a polar group is introduced may be additionally included to improve initial modulus.

The polyolefin resin may preferably be a polypropylene resin, and may be a homopolymer or a random or block copolymer, and a block copolymer is preferable in consideration of cold resistance and mechanical properties. When the content of the polyolefin resin is less than 50 parts by weight, the hardness decreases, causing the insulator to be pressed when twisting the conductor wire 110 for manufacturing the pair unit 100, the scratch resistance decreases, and the appearance may be rough during high-speed extrusion. On the other hand, if it exceeds 90 parts by weight, elongation and flexibility may be deteriorated.

The thermoplastic polyolefin elastomer resin may be, for example, a copolymer of ethylene and other α-olefins, for example, an ethylene propylene copolymer, or a thermoplastic elastomer including a styrene-ethylene-butylene-styrene copolymer, and the like. In consideration of properties and the like, a thermoplastic elastomer including an ethylene/α-olefin copolymer is preferred. In addition, the reactive polyolefin into which the polar group is introduced is preferably a polypropylene grafted with maleic anhydride, glycidyl methacrylate, or the like.

The flame retardant may be added in an amount of 50 to 150 parts by weight based on 100 parts by weight of the base resin. The flame retardant may be, for example, a metal hydroxide such as magnesium hydroxide or aluminum hydroxide, and may not be surface-treated or may be surface-treated with silane or stearic acid. If the content of the flame retardant is less than 50 parts by weight, flame retardancy may be insufficient, whereas if the content of the flame retardant is more than 150 parts by weight, processability and electrical properties may be deteriorated.

The flame retardant aid may be a halogen-based flame retardant aid such as a bromine-based flame retardant, an antimony-based flame retardant aid such as antimony trioxide, etc., and based on 100 parts by weight of the base resin, the halogen-based flame retardant aid is 30 to 100 parts by weight, and an antimony flame retardant aid It may be added in 5 to 100 parts by weight.

If the content of the halogen-based flame retardant aid is less than 30 parts by weight or the content of the antimony-based flame retardant aid is less than 5 parts by weight, there is no effect of increasing the flame retardancy. I can. As the other additives that may be included in the flame-retardant polyolefin composition, a small amount of lubricant, antioxidant, processing aid, etc. may be used according to other purposes.

The insulator formed by the flame-retardant polyolefin composition preferably has a dielectric constant (@1MHz) of 2.9 or less, a limiting oxygen index (LOI) of 30% or more, a smoke density (ASTM E662, Flaming mode, Dm) of 500 or less, and an elongation at room temperature. 100% or more (UL444), room temperature tensile strength of 8.3 MPa (UL444) or more, elongation and tensile residual after heating must be 75% or more (UL444, 2 days at 100°C), and sufficient electrical power according to the above composition and physical properties. It can exhibit properties, mechanical properties, flame retardancy, and retardation.

The flame-retardant polyolefin composition imparts CMP-grade flame retardancy to a UTP cable including an insulator formed therefrom, and at the same time satisfies sufficient electrical properties, unlike the flame-retardant insulating resin for forming an insulator of a conventional UTP cable, the thickness and volume of the cable. Not only does not increase excessively, and unlike conventional fluororesins, the manufacturing cost is low, processability is excellent, and it is environmentally friendly.

3 is a longitudinal sectional structure of a CMP flame retardant grade 4-pair (FRPO: fluorine resin = 1:3) UTP cable according to an embodiment of the present invention, and FIG. 4 is a CMP according to an embodiment of the present invention. Flame-retardant grade 4-pair (FRPO: fluorine resin = 2:2) UTP cable longitudinal section structure, Figure 5 is a CMP flame retardant grade 4-pair (FRPO) according to an embodiment of the present invention : Fluorine resin = 3: 1) The longitudinal cross-sectional structure of the UTP cable, and Fig. 6 is a CMP flame retardant grade 4-pair (FRPO: fluorine resin = 4: 0) UTP cable according to an embodiment of the present invention. Each schematically shows the longitudinal sectional structure.

2 to 6, the CMP flame retardant grade UTP cable according to the present invention has a plurality of pair units 100 adjacent to each other within one outer jacket 300, so that each pair unit 100 A phenomenon in which noise is generated in the transmission signal of another adjacent pair unit 100 by an electromagnetic field formed by a flowing current may be adversely affected, that is, a crosstalk phenomenon may occur, and such a crosstalk phenomenon may be suppressed or minimized. In order to do so, each pair unit 100 has a structure in which a plurality of conductors 110 are twisted at different pitches.

As described above, the insulator 112a of the conducting wire 110a constituting the first pair unit 100a of the plurality of pair units 100 is formed of the flame-retardant polyolefin composition, and at least one second The insulator 112b of the conductive wire 110b constituting the pair unit 100b may be formed of a conventional fluororesin. Here, the conventional insulating layer formed of fluororesin has an elongation at room temperature of 200% (UL444) or more, a tensile strength at room temperature of 17.2 MPa (UL444) or more, and an elongation and tensile strength of 75% before heating (UL444, 7 at 232℃). Daily) or more.

Here, since the flame-retardant polyolefin composition and the fluororesin have different dielectric constants, the UTP cable including the first and second pair units 100a and 100b composed of these different insulators 112a and 112b has a signal phase difference and a delay time of arrival. Such problems may occur.

Therefore, the twist pitch of the second pair unit 100b composed of the insulator 112b formed of the fluororesin having a relatively low dielectric constant compared to the flame-retardant polyolefin composition whose dielectric constant is increased by the addition of a flame retardant and an additive is set as the first pair. By designing to be shorter than the twisting pitch of the unit 100a, problems such as the signal phase difference and arrival time delay of the UTP cable can be suppressed or minimized. Here, it is preferable that the difference in transmission speed between the first pair unit 100a and the second pair unit 100b is 45 ns or less.

For example, the twist pitch of the first pair unit 100a may be about 0.55 to 1.2 inches, the twist pitch of the second pair unit 100b may be about 0.3 to 0.5 inches, and the first pair of UTP cables One pair unit 100a may be 1 to 4, and the second pair unit 100b may be 0 to 3. The plurality of first pair units 100a may be twisted at different pitches, respectively, and the same applies when the plurality of second pair units 100b are formed.

In particular, in the 4-pair UTP cable, the first pair unit 100a or the second pair unit 100b having the shortest twist pitch and the first pair unit 100a or the second pair unit having a short twist pitch next. It is preferable that (100b) is disposed at a diagonal position most spaced apart from each other.

In the present invention, the outer jacket 300 may preferably be made of a flame-retardant resin composition including polyvinyl chloride (PVC) as a base resin. The degree of polymerization of the polyvinyl chloride (PVC) is preferably about 1,000 to 1,700 in order to exhibit mechanical properties and thermal stability suitable for use as an outer jacket material for Plenum grade UTP (Unshielded Twisted Pair) cables.

In the UTP cable according to the present invention, when the insulators of all pair units are formed by the flame-retardant polyolefin composition according to the present invention, the flame-retardant resin composition constituting the outer jacket 300 is an additional flame retardant in addition to polyvinyl chloride (PVC). , Plasticizers, and other additives.

The flame retardant may include a bromine-based flame retardant such as tetrabromophthalic anhydride, a phosphorus-based flame retardant such as triphenyl phosphate, magnesium hydroxide (Mg(OH) ₂ ), and a metal hydroxide such as aluminum hydroxide (Al(OH) ₃ ), It may preferably contain a combination of these.

Based on 100 parts by weight of the polyvinyl chloride (PVC), the bromine-based flame retardant is 10 to 30 parts by weight, the phosphorus-based flame retardant is 10 to 30 parts by weight, the aluminum hydroxide is 50 to 110 parts by weight, the magnesium hydroxide is 10 to Each may be included in 20 parts by weight. When the content of each flame retardant is less than the minimum content, the intended flame retardancy cannot be exhibited, whereas when the content exceeds each maximum, the tensile strength of the outer jacket 300 is lowered, and it is discharged to the outside during extrusion or molding. It can reduce the sex.

The flame retardant may have a surface treated with silane or the like to improve compatibility with polyvinyl chloride (PVC), but due to such surface treatment, the flame retardancy of the outer jacket 300 including the flame retardant decreases, and the unit cost of the UTP cable It is preferable not to perform the surface treatment of the flame retardant from this viewpoint because it may increase.

The flame retardant resin composition constituting the outer jacket 300 may further include a flame retardant auxiliary. The flame retardant aid may include inorganic flame retardants such as zinc borate, sodium silicate, molybdenum compound, ammonium phosphate, ammonium carbonate, ammonium polyphosphate, red phosphorus, or a combination thereof, preferably zinc borate.

Since the flame retardant added to the resin composition constituting the outer jacket 300 may deteriorate molding processability, water resistance, and mechanical performance of the resin composition when mass compounded, the need for mass mixing of the flame retardant by applying the flame retardant auxiliary Can be lowered. In addition, as the flame retardant auxiliary, zinc borate may further improve smoke retardancy, which is a characteristic of suppressing smoke generation.

When the flame retardant auxiliary is added, the content thereof may be 5 to 10 parts by weight based on 100 parts by weight of the polyvinyl chloride (PVC). When the content of the flame retardant auxiliary is less than 5 parts by weight, the effect of increasing flame retardancy and improving the suppression property may be insufficient, whereas when it is more than 10 parts by weight, the moldability and mechanical properties of the resin composition may be reduced.

The flame-retardant resin composition constituting the outer jacket 300 can be improved to 50 to 65% of the limit oxygen index (LOI) by adding the flame retardant and the flame retardant auxiliary to the polyvinyl chloride (PVC). It is much cheaper than flame retardant polyvinyl chloride of flame retardant grade with an oxygen index (LOI) of 60% or higher.

The flame-retardant resin composition constituting the outer jacket 300 may further include a plasticizer to restore processability, moldability, and the like, which are deteriorated by the addition of the flame retardant and flame retardant auxiliary. The plasticizer may preferably include a trimellitate-based plasticizer, a bromine-based flame-retardant plasticizer, a phosphorus-based flame-retardant plasticizer, an adipate-based cold-resistant plasticizer, or a combination thereof.

Based on 100 parts by weight of the polyvinyl chloride (PVC), trimellitate plasticizer is 10 to 30 parts by weight, bromine flame retardant plasticizer is 10 to 30 parts by weight, phosphorus flame retardant plasticizer is 10 to 30 parts by weight, adipate-based Plasticizers may be included in 5 to 20 parts by weight, respectively. When the content of each plasticizer is less than the minimum content, the intended processability and moldability cannot be achieved, whereas when the content exceeds the maximum content, the tensile strength of the outer jacket 300 is lowered, It may be discharged or rather reduce the formability.

On the other hand, the flame-retardant resin composition constituting the outer jacket 300 may further include a heat stabilizer, an antioxidant, a lubricant, etc. as needed in addition to the base resin, a flame retardant, a flame retardant auxiliary, and a plasticizer.

In the CMP grade UTP cable according to the present invention, the thickness of the outer jacket 300 may be different depending on the material forming the insulator of the pair unit. For example, when the insulator 112 of 1 to 3 pair units 100 of the 4 pair units 100 is formed from the flame-retardant polyolefin composition according to the present invention, the thickness of the outer jacket 300 is about While it may be 0.3 to 0.4 mm, preferably about 0.35 mm, when the insulator 112 of all four pair units 100 is formed from the flame-retardant polyolefin composition according to the present invention, the thickness of the outer jacket 300 May be about 0.45 to 0.55, preferably about 0.5 mm. When the thickness of the outer jacket 300 increases, the flame retardancy of the cable is improved, but the total amount of smoke is also increased.

In the flame-retardant UTP cable according to the present invention, the outer jacket 300 exhibits sufficient flame retardancy and suppression by the above configuration, and at the same time exhibits an effect of lowering the manufacturing cost of the UTP cable.

The flame-retardant UTP cable according to the present invention includes a separator including a plurality of partition walls disposed between each of the plurality of pair units 100 to maintain the arrangement of the plurality of pair units 100 inside the outer jacket 300 ( 400) may additionally be included. The separator 400 performs a function of improving structural stability of the UTP cable by stably maintaining the arrangement of the plurality of pair units 100 and improving the resistance of the outer jacket 300 to external pressure. The separator 400 may be made of a material that is the same as or different from a material constituting the outer jacket 300.

The flame-retardant UTP cable according to the present invention may further include a lip cord 500 inside the outer jacket 300. The lip cord 500 is used to facilitate the peeling of the outer jacket 300, Kevlar aramid yarn, fiber glass epoxy rod, fiber reinforced polyethylene (FRP; Fiber Reinforced) Polyethylene), high-strength fiber, galvanized steel wire, steel wire, etc., can function as a tensile wire that imparts tensile strength to the UTP cable.

<Example>

1. Example of insulator made of flame retardant polyolefin composition

end. Manufacturing example

After preparing a polyolefin composition according to Examples and Comparative Examples with the components and contents shown in Table 1 below at 210°C using a twin screw extruder, an insulator specimen was prepared at 190°C using a hot press. The units of the contents listed in Table 1 are parts by weight.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Resin 1 70 80 62 90 70 70 Suzy 2 30 20 10 30 30 Suzy 3 35 Suzy 4 3 Flame retardant 1 100 80 70 160 80 Flame retardant 2 80 Flame retardant aid 1 30 40 40 40 30 110 Flame retardant aid 2 20 30 20 30 20 20 Talc 5 10 5 5 Antioxidant One One One One One One Lubricant One One One One One One Processing aid One One One One One One

Resin 1: Block polypropylene (MFR: 10g/10min (2.16kg, @230℃), density: 0.91, Tm: 165℃)

Resin 2: Ethylene propylene elastomer (MFR: 3.2g/10min (2.16kg, @230℃), density: 0.86)

Resin 3: Ethylene propylene elastomer (MFR: 0.8g/10min (2.16kg, @230℃), Tm: 160℃)

Resin 4: Maleic anhydride-grafted homopolypropylene (MFR: 0.9g/10min (2.16kg, @230℃), density: 0.9)

Flame retardant 1: Magnesium hydroxide surface-treated with lubricant

Flame retardant 2: Magnesium hydroxide surface-treated with silane

Flame retardant auxiliary 1: Brominated flame retardant

Flame retardant aid 2: Antimony trioxide

I. Property evaluation

(1) Evaluation of mechanical properties

When evaluated according to standard UL444, the elongation of the insulator specimen must be 100% or more, and the melt flow rate (MFR) (2.16kg, @230°C) measured according to ASTM D1238 for the composition before specimen preparation is 5 g/10min. It should be above.

(2) dielectric constant evaluation

In order to satisfy sufficient electrical characteristics, the dielectric constant must be 2.9 or less.

(3) Flame retardancy evaluation

The limiting oxygen index (LOI) of the insulating material should be 30% or more, and the smoke density (ASTM E662, Flaming mode, Dm) should be 500 or less when tested with a 2mm specimen.

The results of evaluating the physical properties are shown in Table 2 below.

Properties unit Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Elongation % 150 300 350 85 120 250 Melt flow rate g/10min 5.5 6.0 5.7 5.5 5.0 3.5 permittivity 2.75 2.88 2.82 2.70 3.21 2.90 Limiting oxygen index % 32.5 34.0 33.0 33.5 35.5 40.0 Smoke density 450 400 430 480 380 650

As shown in Table 2, the insulator of Comparative Example 1 contained an excessive amount of hard polypropylene resin and contained a small amount of the soft elastomer resin, so that the elongation of the composition was insufficient to be less than 100%, and the insulator of Comparative Example 2 was As the flame retardant was included in an excessive amount, the dielectric constant exceeded 2.9 and the electrical characteristics were greatly damaged.In Comparative Example 3, the smoke suppression property greatly exceeded 500 by including an excessive amount of the halogen-based flame retardant auxiliary, and the melt flow rate was also 5 g/ It was confirmed that it did not reach a large amount of 10 min.

On the other hand, Examples 1 to 3, which are insulators used in the UTP cable of the present invention, were found to be excellent in balance in mechanical properties such as elongation and melt flow rate, electrical properties, flame retardancy, and retardation.

2. Examples of outer jacket and UTP cable

end. Manufacturing example

By using a twin screw extruder at 210°C under the conditions described in Table 3 below, by using an outer jacket and a fluororesin made of a PVC resin composition prepared according to Examples and Comparative Examples, an insulating composition according to Example 3, or a HDPE resin composition. A 4-pair UTP cable specimen was prepared by applying the prepared insulating layer.

I. Property evaluation

(1) Evaluation of mechanical properties

The tensile strength and elongation of the outer jacket were measured according to the UL444 standard, and the tensile strength should be 1.76kgf/㎟ or more and the elongation rate should be 100% or more.

(2) Flame retardancy evaluation

In accordance with the NFPA 262 standard, flame retardancy and retardation were measured, and the flame propagation indicating flame retardancy should be less than 5 ft, and the smoke density indicating flame retardancy, that is, peak smoke emission and average smoke emission should be less than 0.5 and 0.15, respectively.

The evaluation results of the physical properties and flame retardancy are as shown in Table 3 below.

Number of pair unit insulators Outer jacket UL444 NFPA 262 FEP
Pair unit
(dog) FRPP
Pair unit
(dog) material thickness
(mm) Elongation
(%) Seal
burglar
(kgf/㎟) Flame
Propagation
(ft) Peak
Smoke Avg.
Smoke Example 1 2 2 PVC1 0.35 142 1.90 3.5 0.3 0.11 Example 2 0 4 PVC2 0.5 185 1.79 3.5 0.38 0.11 Example 3 0 4 PVC3 0.5 182 1.80 3.0 0.35 0.10 Comparative Example 1 2 2 PVC0 0.35 - - 2.5 0.68 0.19 Comparative Example 2 0 4 PVC1 0.35 142 1.90 17 0.79 0.22 Comparative Example 3 0 4 PVC1 0.5 198 1.91 6.0 0.75 0.21 Comparative Example 4 0 4 PVC1 0.65 - - 3.5 1.01 0.25 Comparative Example 5 0 4 PVC4 0.5 191 1.39 3.5 0.40 0.12 Comparative Example 6 0 4 PVC5 0.5 174 1.38 3.0 0.35 0.11 Comparative Example 7 0 4 PVC6 0.5 188 1.82 6.0 0.49 0.14 Comparative Example 8 0 4 PVC7 0.5 186 1.81 5.5 0.45 0.14 Comparative Example 9 0 4 PVC8 0.5 195 1.85 5.5 0.47 0.13 Comparative Example 10 0 4 PVC9 0.5 199 1.79 5.5 0.53 0.17

PVC0: Polyvinyl chloride composition (LOI=45~47%)

PVC1: flame-retardant polyvinyl chloride composition (manufacturer: Teknor Apex; product name: 910A-60NL; LOI=49-51%) (polyvinyl chloride resin 100 parts by weight, trimellitate plasticizer 20 parts by weight, bromine plasticizer 15 parts by weight) , Phosphorus plasticizer 10 parts by weight, adipate plasticizer 5 parts by weight, tetrabromophthalic anhydride flame retardant 20 parts by weight, triphenyl phosphate flame retardant 10 parts by weight, including aluminum hydroxide 80 parts by weight)

PVC2: Flame-retardant polyvinyl chloride composition (PVC1: magnesium hydroxide = 260:10)

PVC3: Flame-retardant polyvinyl chloride composition (PVC1: magnesium hydroxide: zinc borate = 260:10:5)

PVC4: polyvinyl chloride composition (PVC1: magnesium hydroxide: zinc borate = 260:25:5)

PVC5: Flame-retardant polyvinyl chloride composition (PVC1: magnesium hydroxide: zinc borate = 260:30:5)

PVC6: flame-retardant polyvinyl chloride composition (PVC1: zinc borate = 260:5)

PVC7: flame-retardant polyvinyl chloride composition (PVC1: zinc borate = 260:10)

PVC8: Flame-retardant polyvinyl chloride composition (PVC1: magnesium hydroxide: zinc borate = 260: 5:5)

PVC9: Flame-retardant polyvinyl chloride composition (PVC1: magnesium hydroxide = 260:5)

As shown in Table 3, Comparative Examples 1 to 4 have a low limiting oxygen index (LOI) of the polyvinyl chloride (PVC) composition itself constituting the outer jacket, and the composition additionally contains a flame retardant, a flame retardant, etc. Since it is not or is insufficiently included, the flame propagation and/or peak smoke/avg. smoke of the cable is below the standard, and Comparative Examples 5 and 6 are used in the polyvinyl chloride (PVC) composition constituting the outer jacket. Since the flame retardant was added in an excessive amount, the tensile strength was greatly reduced.In Comparative Examples 7 to 10, a flame retardant and/or a flame retardant auxiliary were added to the polyvinyl chloride (PVC) composition constituting the outer jacket in an insufficient amount. Flame propagation) and/or peak smoke/avg. smoke were found to be below the standard.

On the other hand, it was confirmed that the UTP cables of Examples 1 to 3 according to the present invention satisfies flame propagation and peak smoke/avg. smoke according to the NFPA 262 standard, and at the same time has excellent mechanical properties.

Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art may variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the following claims. I will be able to do it. Therefore, if the modified implementation basically includes the elements of the claims of the present invention, it should be seen that all are included in the technical scope of the present invention.

100: pair unit 300: outer jacket
400: separator 500: lip cord

Claims (19)

100 parts by weight of a base resin including 50 to 90 parts by weight of a polyolefin resin and 10 to 50 parts by weight of a thermoplastic polyolefin elastomer resin;
50 to 150 parts by weight of a metal hydroxide flame retardant; And
Including 30 to 100 parts by weight of a halogen-based flame retardant auxiliary,
The dielectric constant (@1MHz) is 2.9 or less, the Limited Oxygen Index (LOI) is 30% or more, the smoke density measured according to ASTM E662 is 500 or less, and the room temperature elongation measured according to UL444 is 100% Flame-retardant polyolefin composition for insulators of CMP flame retardant grade UTP cables having a tensile strength of at least 8.3 MPa at room temperature. The method of claim 1,
The polyolefin resin is a polypropylene block copolymer, and the thermoplastic polyolefin elastomer resin is an ethylene propylene copolymer, characterized in that, a flame-retardant polyolefin composition for an insulator of a CMP flame retardant grade UTP cable. The method according to claim 1 or 2,
The base resin, based on a total of 100 parts by weight of the base resin, characterized in that it further comprises 2 to 10 parts by weight of a reactive polyolefin into which a polar group is introduced, a flame-retardant polyolefin composition for an insulator of a CMP flame-retardant grade UTP cable. The method of claim 3,
The reactive polyolefin into which the polar group is introduced is a polypropylene grafted with maleic anhydride or glycidyl methacrylate. A flame-retardant polyolefin composition for an insulator of a CMP flame-retardant UTP cable. The method according to claim 1 or 2,
The flame retardant polyolefin composition for an insulator of a CMP flame retardant grade UTP cable, characterized in that the metal hydroxide flame retardant is magnesium hydroxide or aluminum hydroxide whose surface has been modified with silane or stearic acid. delete The method according to claim 1 or 2,
A flame-retardant polyolefin composition for an insulator of a CMP flame-retardant grade UTP cable, characterized in that after heating at 100° C. for 2 days, the residual elongation and tensile residual after heating measured according to UL444 are 75% or more, respectively. The method according to claim 1 or 2,
A flame-retardant polyolefin composition for an insulator of a CMP flame-retardant grade UTP cable, further comprising a lubricant, an antioxidant, a processing aid, or a combination thereof. A plurality of pair units formed by twisting a plurality of conductive wires including a conductor and an insulator surrounding the conductor with each other, and an outer jacket surrounding the plurality of pair units;
The plurality of pair units includes one or more first pair units formed by twisting a plurality of conductors including an insulator formed from a flame-retardant polyolefin composition for an insulator of a CMP flame-retardant grade UTP cable according to claim 1 or 2. Characterized in that, CMP flame retardant grade UTP cable. The method of claim 9,
The plurality of pair units comprises at least one second pair unit formed by twisting a plurality of conductive wires including an insulator formed from a fluororesin to each other. CMP flame retardant grade UTP cable. The method of claim 10,
The twist pitch of the first pair unit is 0.55 to 1.2 inches, characterized in that the twist pitch of the second pair unit is 0.3 to 0.5 inches, CMP flame retardant grade UTP cable. The method of claim 10,
The first pair of the second pair unit is one, the twist pitch of the second pair unit is shorter than the twist pitch of each of the plurality of first pair units, and the twist pitch of the conductor wire is the shortest among the plurality of first pair units CMP flame-retardant grade UTP cable, characterized in that the unit is disposed on the diagonally spaced apart from the second pair unit. The method of claim 10,
The first pair unit and the second pair unit are each two, the twist pitch of each of the second pair units is shorter than the twist pitch of each of the first pair units, and the two second pair units are most spaced apart from each other. Characterized in that arranged in a diagonal position, CMP flame retardant grade UTP cable. The method of claim 9,
There are four first pair units,
The outer jacket is formed from a flame retardant polyvinyl chloride resin composition,
The flame-retardant polyvinyl chloride resin composition may include polyvinyl chloride (PVC) having a polymerization degree of 1,000 to 1,700; A flame retardant comprising 10 to 30 parts by weight of a bromine flame retardant, 10 to 30 parts by weight of a phosphorus flame retardant, 50 to 110 parts by weight of aluminum hydroxide, and 10 to 20 parts by weight of magnesium hydroxide based on 100 parts by weight of the polyvinyl chloride (PVC); And a plasticizer comprising 10 to 30 parts by weight of a trimellitate-based plasticizer, 10 to 30 parts by weight of a brominated flame-retardant plasticizer, 10 to 30 parts by weight of a phosphorus-based flame-retardant plasticizer, and 5 to 20 parts by weight of an adipate-based cold-resistant plasticizer. , CMP flame retardant grade UTP cable. The method of claim 14,
The flame-retardant polyvinyl chloride resin composition, based on 100 parts by weight of the polyvinyl chloride (PVC), is a flame retardant aid of zinc borate, sodium silicate, molybdenum compound, ammonium phosphate, ammonium carbonate, ammonium polyphosphate, red phosphorus, or a combination thereof Characterized in that it further comprises 5 to 10 parts by weight, CMP flame retardant grade UTP cable. The method of claim 14,
The bromine-based flame retardant is tetrabromophthalic anhydride, and the phosphorus-based flame retardant is triphenyl phosphate, CMP flame retardant grade UTP cable. The method of claim 14,
The flame retardant is characterized in that the surface is not modified, CMP flame retardant grade UTP cable. The method of claim 9,
A CMP flame retardant grade UTP cable, characterized in that it further comprises a separator including a plurality of partition walls disposed between each of the plurality of pair units to maintain the arrangement of the plurality of pair units. The method of claim 9,
CMP flame retardant grade UTP cable, characterized in that it further comprises a lip cord to facilitate the stripping of the outer jacket.

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