KR102322295B1 - CMP grade UTP cable - Google Patents

Abstract

The present invention relates to a Plenum grade UTP (Unshielded Twisted Pair) cable, which has high flame retardancy of a CMP (Communication Plenum) grade, does not increase thickness and volume, reduces manufacturing costs, and relates to a UTP cable made of an environmentally friendly material will be.

Description

CMP grade UTP cable {CMP grade UTP cable}

The present invention relates to a Plenum grade UTP (Unshielded Twisted Pair) cable, which has high flame retardancy of a CMP (Communication Plenum) grade, does not increase thickness and volume, reduces manufacturing costs, and relates to a UTP cable made of an environmentally friendly material will be.

UTP (Unshielded Twisted Pair) cable is a kind of signal line that connects general telephone line or LAN environment. The name means line.

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 wires 110 at a predetermined pitch with a conductive metal wire 111 , preferably an annealed copper wire, insulated with an insulator 112 . .

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, such as a fluororesin, flame-retardant polyethylene ( It is made of flame-retardant materials such as fire-resistant polyethylene (FRPE) and flame-retardant polyolefins such as fire-resistant polypropylene (FRPP).

However, fluororesin has excellent flame retardancy and electrical properties, but its high price increases the unit price of the cable, and its high viscosity during melting makes it difficult to fusion mold, and has poor processability. There is a problem that it is not environmentally friendly.

Therefore, a technology has been developed to replace the insulator 112 constituting the pair unit 100 of some of the plurality of pair units 100 with a flame-retardant polyolefin material, or double insulation of an inner flame-retardant polyolefin and an outer fluororesin.

However, since the flame retardant polyolefin is a material in which a large amount of flame retardants and additives are mixed with the polyolefin resin, the dielectric constant and dielectric loss increase and thus the electrical properties are greatly deteriorated. As a result, the flame retardancy of the cable is reduced.

In addition, when a flame-retardant polyolefin is applied, it may be considered to apply the outer jacket 300 to a high-flammable polyvinylchloride (PVC) material in order to minimize the decrease in flame retardancy, but this is a problem that results in an increase in the unit price of the cable there is

Therefore, there is an urgent need for a flame-retardant UTP cable that is not environmentally friendly and does not increase the thickness and volume of the cable while ensuring high flame retardancy of a CMP (Communication Plenum) grade without using an expensive fluororesin.

An object of the present invention is to provide a UTP cable having a high flame retardancy of a CMP (Communication Plenum) grade.

Another object of the present invention is to provide a UTP cable that is environmentally friendly and reduces manufacturing costs.

Furthermore, an object of the present invention is to provide a UTP cable in which thickness and volume are not increased as a whole because thickness and volume are not increased even though the insulator achieves sufficient flame retardancy and electrical properties at the same time.

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

A plurality of pair units formed by twisting a plurality of conductive wires including a conductor and an insulator surrounding the conductors, and an outer jacket surrounding the plurality of pair units, wherein the plurality of pair units are flame retardant At least one first pair unit formed by twisting a plurality of conductive wires including an insulator formed from a polyolefin resin composition with each other and a plurality of conductive wires including an insulator formed from a non-flammable polyolefin resin composition twisting each other 2 pair units, wherein the flame-retardant polyolefin resin composition comprises 50 to 90 parts by weight of a polyolefin resin and 10 to 50 parts by weight of a thermoplastic polyolefin elastomer resin as a base resin, based on 100 parts by weight of the base resin, a metal hydroxide flame retardant 50 to 150 parts by weight, wherein the non-flammable polyolefin resin composition includes an ethylene-α-olefin copolymer, and the polyolefin resin has a melt flow rate (MFR) (2.16 kg, 230° C.) of 3 to 15 g/10 min, The outer jacket comprises a flame retardant polyvinyl chloride resin and 5 to 10 parts by weight of a metal hydroxide flame retardant based on 100 parts by weight of the flame retardant polyvinyl chloride resin. It provides a CMP flame retardant grade UTP cable, characterized in that.

Here, the flame-retardant polyolefin resin composition has a dielectric constant of 2.9 or less, a Limited Oxygen Index (LOI) of 30% or more, a smoke density measured according to ASTM E662 of 500 or less, and a melt flow rate (2.16 kg, 230° C.) It provides a CMP flame retardant grade UTP cable, characterized in that 5 g/10min or more.

In addition, the flame retardant polyvinyl chloride resin provides a CMP flame retardant grade UTP cable, characterized in that the limiting oxygen index (LOI) is 45 to 60%.

On the other hand, 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 conducting wire is the shortest among the plurality of first pair units. It provides a CMP flame-retardant grade UTP cable, characterized in that one pair unit is disposed at the diagonal most spaced apart from the second pair unit.

In addition, the number of the second pair units is two, a twist pitch of each of the two second pair units is shorter than a twist pitch of each of the plurality of first pair units, and the two second pair units are diagonally most spaced apart from each other. It provides a CMP flame retardant grade UTP cable, characterized in that it is disposed in position.

And, the twist pitch of the first pair unit is 0.6 to 1.2 inches, and the second pair unit has a twist pitch of 0.3 to 0.53 inches, it provides a CMP flame retardant grade UTP cable.

Furthermore, there is provided a CMP flame retardant class UTP cable, characterized in that the transmission speed difference between the first pair unit and the second pair unit is 45 ns or less.

In addition, it provides a CMP flame retardant grade UTP cable, characterized in that the volume of the insulator forming the second pair unit is 85 to 95% of the volume of the insulator forming the first pair unit.

On the other hand, the polyolefin resin comprises a polypropylene block copolymer, and based on 100 parts by weight of the polyolefin resin, 30 to 100 parts by weight of a halogen-based flame retardant aid and 5 to 100 parts by weight of an antimony-based flame retardant aid. provides a CMP flame retardant grade UTP cable.

Here, the flame-retardant polyolefin resin composition, based on 100 parts by weight of the base resin, provides a CMP flame retardant grade UTP cable, characterized in that it further comprises 2 to 10 parts by weight of a reactive polyolefin introduced with a polar group.

In addition, the ethylene-α-olefin copolymer provides a CMP flame retardant grade UTP cable, characterized in that it comprises a high-density polyethylene resin.

And, the metal hydroxide flame retardant provides a CMP flame retardant grade UTP cable, characterized in that it _{comprises magnesium hydroxide (Mg(OH) 2 ).}

Furthermore, the metal hydroxide flame retardant provides a CMP flame retardant grade UTP cable, characterized in that the surface is not treated.

On the other hand, the outer jacket, based on 100 parts by weight of the flame-retardant polyvinyl chloride resin, provides a CMP flame retardant grade UTP cable, characterized in that it further comprises 2 to 5 parts by weight of zinc borate.

In addition, the outer jacket provides a CMP flame retardant grade UTP cable, characterized in that the limiting oxygen index (LOI) is 60% or more.

And, it provides a CMP flame retardant grade UTP cable, characterized in that it further comprises a separator including a plurality of barrier ribs disposed between each of the plurality of pair units to maintain the arrangement of the plurality of pair units.

Furthermore, it provides a CMP flame retardant grade UTP cable, characterized in that it further comprises a rip code to facilitate the peeling of the outer jacket.

The flame retardant UTP cable according to the present invention exhibits an excellent effect of retaining high flame retardancy of CMP (Communication Plenum) grade despite not applying a fluororesin insulator by a specific flame retardant insulator and outer jacket.

In addition, the flame-retardant UTP cable according to the present invention emits harmful gases such as fluorinated gas during incineration or fire and does not apply an environmentally friendly and expensive fluororesin insulator. indicates.

Furthermore, the flame retardant UTP cable according to the present invention exhibits an excellent effect that the thickness and volume of the cable do not increase despite achieving sufficient flame retardancy and electrical properties at the same time by changing the insulator material used for the pair unit.

1 schematically shows a cross-sectional structure of a 4-pair UTP cable in which four pair units are wrapped with an outer jacket.
Figure 2 schematically shows a cross-sectional structure of a CMP flame retardant class UTP cable according to an embodiment of the present invention.
Figure 3 schematically shows the longitudinal cross-sectional structure of the CMP flame retardant class UTP cable according to an embodiment of 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 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 that the spirit of the present invention may be sufficiently conveyed to those skilled in the art. Like reference numerals refer to like elements throughout.

2 schematically shows a cross-sectional view of a CMP flame retardant class UTP cable according to an embodiment of the present invention.

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

The standard and material 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, or tinned copper, and may be a solid wire or a stranded wire. , preferably, may be a twisted pair to improve the 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 wire diameter may be about 0.203 mm.

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

The flame-retardant polyolefin resin composition may include, for example, a base resin, a flame retardant, a flame retardant auxiliary agent, and other additives. 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 100 parts by weight in total. In addition, 2 to 10 parts by weight of a reactive polyolefin having a polar group introduced therein may be additionally included to improve the initial modulus.

The polyolefin resin may be a homopolymer or a random or block copolymer, preferably a block copolymer in consideration of cold resistance and mechanical properties. When the content of the polyolefin resin is less than 50 parts by weight, the hardness is lowered, and when the conductor wire 110 for manufacturing the pair unit 100 is twisted, the insulator is pressed, the scratch resistance is lowered, and the appearance may become rough during high-speed extrusion. On the other hand, when it exceeds 90 parts by weight, elongation and flexibility may be reduced. The polyolefin may preferably have a melting flow rate (MFR) (2.16 kg, 230° C.) of 3 to 15.

The thermoplastic polyolefin elastomer resin may be, for example, a thermoplastic elastomer including a copolymer of ethylene and other α-olefin, for example, an ethylenepropylene copolymer, or a styrene-ethylene-butylene-styrene copolymer, etc. In consideration of properties and the like, a thermoplastic elastomer including an ethylene-α-olefin copolymer is preferable. 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 thermoplastic polyolefin elastomer resin may preferably have an MFR (2.16 kg, 230° C.) of 3 to 15.

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 by silane, stearic acid, or the like. If the content of the flame retardant is less than 50 parts by weight, the flame retardancy may be insufficient, whereas if it is more than 150 parts by weight, workability and electrical properties may be deteriorated.

The flame-retardant auxiliary agent may be a halogen-based flame retardant auxiliary agent such as a bromine-based flame retardant, an antimony-based flame retardant auxiliary agent such as antimony trioxide, etc. 5 to 100 parts by weight may be added.

If the content of the halogen-based flame-retardant aid is less than 30 parts by weight and the content of the antimony-based flame-retardant aid is less than 5 parts by weight, there is no flame retardant synergistic effect. can As the other additives that may be included in the flame-retardant polyolefin resin composition, a small amount of lubricants, antioxidants, processing aids, and the like may be used according to other purposes.

The flame retardant polyolefin resin 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, MFR (2.16 kg, 230) ℃) is 5 g/10min or more, and exhibits sufficient electrical properties, mechanical properties, flame retardancy, flame retardancy, etc. by the above configuration and physical properties.

The insulator 112 constituting at least one pair unit 100 among the plurality of pair units 100 is a non-flammable insulating resin composition, preferably a polyolefin-based resin such as polyethylene or polypropylene, more preferably a high-density polyethylene resin. It may be a composition comprising. Polyethylene vinyl acetate (EVA), polyvinyl chloride (PVC), etc. can be considered as non-flammable insulating materials, but EVA, PVC, etc. have polar groups in the molecule, increasing dielectric constant and dielectric loss, so UTP cables that require high transmission speed It is not suitable as an insulating material for

Unlike the flame-retardant polyolefin resin composition, the non-flammable insulating resin composition has excellent electrical properties because it does not contain a flame retardant, an additive, etc. that increases the dielectric constant, unlike the flame-retardant polyolefin resin composition. Since it has a volume of 85 to 95%, it is possible to achieve miniaturization and weight reduction of the UTP cable.

Figure 3 schematically shows the longitudinal cross-sectional structure of the CMP flame retardant class UTP cable according to an embodiment of the present invention.

As shown in Figures 2 and 3, the CMP flame retardant grade UTP cable according to the present invention has a plurality of pair units 100 adjacent to each other inside one outer jacket 300, so each pair unit 100 A phenomenon in which noise is generated in the transmission signal of another adjacent pair unit 100 by the electromagnetic field formed by the flowing current, that is, a crosstalk phenomenon may occur, and this crosstalk phenomenon is suppressed or minimized In order to do this, each pair unit 100 has a structure in which a plurality of conductor wires 110 are twisted at a constant pitch, respectively.

As described above, the insulator 112a of the conductive wire 110a constituting one or more first pair units 100a among the plurality of pair units 100 is formed by the flame-retardant polyolefin resin composition, and the other one or more The insulator 112b of the conductive wire 110b constituting the two-pair unit 100b may be formed of the non-flammable insulating resin composition.

Here, since the flame-retardant polyolefin resin and the non-flammable insulating resin 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 is signal phase difference, arrival Problems such as time delay may occur.

Therefore, the twist pitch of the second pair unit 100b composed of the insulator 112b formed of the non-flammable insulating resin having a relatively low dielectric constant compared to the flame-retardant polyolefin resin whose dielectric constant is increased by the addition of a flame retardant, an additive, etc. By designing shorter than the twist pitch of the one-pair unit 100a, it is possible to suppress or minimize problems such as the signal phase difference and arrival time delay of the UTP cable. Here, the difference between the transmission speed between the first pair unit 100a and the second pair unit 100b is preferably 45 ns or less.

For example, the twist pitch of the first pair unit 100a may be about 0.6 to 1.2 inches, and the twist pitch of the second pair unit 100b may be about 0.3 to 0.53 inches, and in the 4-pair UTP cable, the second The number of one pair units 100a may be 2 to 3, and the number of the second pair units 100b may be 1 to 2. The plurality of first pair units 100a may be twisted at different pitches, respectively, and the same applies when there are a plurality of second pair units 100b.

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

In the present invention, the outer jacket 300 may preferably be made of a resin composition including flame-retardant polyvinyl chloride (PVC). The flame retardancy of the flame-retardant polyvinyl chloride (PVC) is preferably a limited oxygen index (LOI) of 45 to 60%, preferably 50 to 55%. Flame-retardant polyvinyl chloride (PVC) of a flame-retardant grade having a limiting oxygen index (LOI) exceeding 60% is very expensive, so there is a problem of excessively increasing the unit price of the UTP cable.

The resin composition constituting the outer jacket 300 may further include a flame retardant in addition to flame retardant polyvinyl chloride (PVC) having a limiting oxygen index (LOI) of 45 to 60%. The flame retardant preferably includes a metal hydroxide such as magnesium hydroxide (Mg(OH) ₂ ), aluminum hydroxide (Al(OH) _{3 ).} The metal hydroxide flame retardant has the advantage of having a low heat effect with flame retardancy due to an endothermic effect due to a dehydration reaction and no toxic gas.

However, in the case of aluminum hydroxide (Al(OH) ₃ ), the resin composition for forming the outer jacket 300 may be decomposed according to the processing temperature during extrusion, and as a result, the physical properties and flame retardancy of the outer jacket 300 may be reduced. Therefore, magnesium hydroxide (Mg(OH) ₂ ) is preferred.

The metal hydroxide flame retardant may be added in an amount of 5 to 10 parts by weight based on 100 parts by weight of the flame-retardant polyvinyl chloride (PVC). If the content of the metal hydroxide flame retardant is less than 5 parts by weight, the flame retardancy may be insufficient, whereas if it exceeds 10 parts by weight, it may be discharged to the outside during extrusion molding of the outer jacket 300 or deteriorate the moldability.

The surface of the metal hydroxide flame retardant is sometimes treated with silane or the like to improve compatibility with polyvinyl chloride (PVC). Since the unit cost may increase, it is preferable not to surface-treat the metal hydroxide flame retardant from this point of view.

The resin composition constituting the outer jacket 300 has a limiting oxygen index (LOI) of 50 to 65% by adding the metal hydroxide flame retardant to the flame-retardant polyvinyl chloride (PVC), and at the same time, the limiting oxygen index ( It is much cheaper than flame-retardant polyvinyl chloride of flame-retardant grades with an LOI of 60% or more.

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

The metal hydroxide flame retardant added to the resin composition constituting the outer jacket 300 may reduce moldability, water resistance, mechanical performance, etc. of the resin composition when mixed in large quantities. can reduce the need. In addition, as the flame retardant auxiliary, zinc borate may further improve flame retardancy, which is a property of suppressing smoke generation.

The flame retardant auxiliary agent may be 2 to 5 parts by weight based on 100 parts by weight of the flame retardant polyvinyl chloride (PVC). If the content of the flame-retardant auxiliary agent is less than 2 parts by weight, the flame retardancy synergistic effect and flame retardancy improvement effect may be insufficient, whereas if it exceeds 5 parts by weight, moldability, mechanical properties, etc. of the resin composition may be reduced.

In the flame-retardant UTP cable according to the present invention, the outer jacket 300 exhibits an effect of reducing the manufacturing cost of the UTP cable while exhibiting sufficient flame retardancy and flame retardancy by the above configuration.

The flame-retardant UTP cable according to the present invention is 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 be further included. The separator 400 performs a function of improving the 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 against external pressure. The separator 400 may be made of the same or different material as the material constituting the outer jacket 300 .

The flame-retardant UTP cable according to the present invention may further include a rip cord 500 inside the outer jacket 300 . The rip cord 500 is used for facilitating peeling of the outer jacket 300, Kevlar aramid yarn, Fiber glass epoxy rod, Fiber Reinforced Polyethylene (FRP) Polyethylene), high-strength fiber, galvanized steel wire, steel wire, etc., can serve as a tension wire that provides tensile strength to the UTP cable.

<Example>

1. Example of insulating layer made of flame-retardant polyolefin resin

go. manufacturing example

After preparing the insulating compositions 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 using a hot press. The units of the content shown 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 67 95 70 70 resin 2 30 20 5 30 30 resin 3 30 resin 4 3 Flame Retardant 1 100 80 70 160 80 Flame Retardant 2 60 Flame Retardant Supplement 1 30 40 40 40 30 110 Flame Retardant Supplement 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: Polypropylene (MFR: 10g/10min(2.16kg, @230℃))

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

Resin 3: Ethylene propylene elastomer (MFR: 0.6g/10min (2.16kg, @230℃))

Resin 4: Polypropylene grafted with maleic anhydride (MFR: 0.9g/10min (2.16kg, @230℃))

Flame retardant 1: Magnesium hydroxide surface-treated with lubricant

Flame retardant 2: Magnesium hydroxide surface-treated with silane

Flame retardant aid 1: Brominated flame retardant

Flame retardant aid 2: antimony trioxide

me. Physical property evaluation

(1) Evaluation of mechanical properties

When evaluated according to standard UL444, the elongation of the insulating material must be 100% or more, and the melt flow rate (MFR) (2.16kg, @230℃) measured according to ASTM D1238 must be 5 g/10min or more.

(2) dielectric constant evaluation

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

(3) Flame retardant 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 Marginal 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 the hard polypropylene resin and a small amount of the soft elastomer resin, so that the elongation rate of the insulation based composition was insufficient to be less than 100%, and the insulator of Comparative Example 2 was By including an excessive amount of the flame retardant, the dielectric constant greatly exceeded 2.9 and the electrical properties were greatly damaged, and in Comparative Example 3, the smoke suppression by including an excessive amount of the halogen-based flame retardant auxiliary agent greatly exceeded 500, and the melt flow rate was also 5 g / It was confirmed that it could not significantly reach 10 min. On the other hand, in Examples 1 to 3, which are insulators used in the UTP cable of the present invention, mechanical properties such as elongation and melt flow rate, electrical properties, flame retardancy, flame retardancy, etc. were all balanced. was found to be excellent.

2. Example of outer jacket and UTP cable

go. manufacturing example

An outer jacket made of the PVC resin composition prepared according to Examples and Comparative Examples with the components and contents shown in Table 3 below at 210° C. using a twin screw extruder and an insulating layer prepared by the insulating composition according to Example 1 by applying Cat. A 4-pair UTP cable specimen of 5e was prepared. The unit of the content shown in Table 2 below is parts by weight.

Ingredients Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 profit 200 200 200 200 200 200 200 200 200 flame retardant 10 20 10 20 - - - 5 30 Flame Retardant
supplements 5 5 - - - 5 10 5 5

Resin: Flame-retardant polyvinyl chloride (PVC) (Manufacturer: Teknor Apex; Product name: 910A-60NL)

Flame retardant: magnesium hydroxide

Flame Retardant Supplement: Zinc Borate

me. Physical 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 should be 100% or more.

(2) Flame retardant evaluation

Flame retardancy and flame retardancy were measured according to NFPA 262 standard. Flame propagation indicating flame retardancy should be less than 5 ft, and 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 physical property evaluation results are shown in Table 4 below.

Properties Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 tensile strength
(kgf/㎟) 1.88 1.82 1.87 1.81 2.01 1.92 1.83 1.93 1.68 Elongation (%) 185 182 191 174 198 188 186 195 164 Flame prop.
(ft) 3.5 3.0 4.5 4.0 6.0 6.0 5.5 5.5 3.0 peak smoke emission 0.38 0.35 0.60 0.55 0.75 0.49 0.45 0.47 0.33 average smoke emission 0.11 0.10 0.15 0.15 0.21 0.16 0.14 0.13 0.10

As shown in Table 4, in Comparative Examples 1 to 4, the flame retardant is not added or the content is insufficient in the flame retardant PVC resin constituting the outer jacket, so that the flame retardant (Flame propagation) is insufficient, and Comparative Example 5 is a flame retardant in the flame retardant PVC resin It was confirmed that the tensile strength of the outer jacket was greatly damaged due to the excessive addition of . On the other hand, it was confirmed that the UTP cables to which the outer jackets of Examples 1 to 4 according to the present invention were applied had sufficient mechanical properties and flame retardancy of the outer jacket.

Although the above has been described with reference to the preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims described below. You can do it. Therefore, if the modified implementation basically includes the elements of the claims of the present invention, all of them should be considered to be included in the technical scope of the present invention.

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

Claims (17)

a plurality of pair units formed by twisting a plurality of conductors including a conductor and an insulator surrounding the conductors, and an outer jacket surrounding the plurality of pair units;
The plurality of pair units includes at least one first pair unit formed by twisting a plurality of conductive wires including an insulator formed from a flame-retardant polyolefin resin composition by twisting each other and a plurality of conductive wires including an insulator formed from a non-flammable polyolefin resin composition. one or more second pair units formed by loading,
The flame-retardant polyolefin resin composition comprises 50 to 90 parts by weight of a polyolefin resin and 10 to 50 parts by weight of a thermoplastic polyolefin elastomer resin as a base resin, and 50 to 150 parts by weight of a metal hydroxide flame retardant based on 100 parts by weight of the base resin,
The non-flammable polyolefin resin composition comprises an ethylene-α-olefin copolymer,
The polyolefin resin has a melt flow rate (MFR) (2.16 kg, 230° C.) of 3 to 15 g/10 min,
The outer jacket comprises a flame retardant polyvinyl chloride resin and 5 to 10 parts by weight of a metal hydroxide flame retardant based on 100 parts by weight of the flame retardant polyvinyl chloride resin,
The flame retardant polyolefin resin composition has a dielectric constant of 2.9 or less, a Limited Oxygen Index (LOI) of 30% or more, a smoke density of 500 or less measured according to ASTM E662, and a melt flow rate (2.16 kg, 230°C) of 5 CMP flame retardant grade UTP cable, characterized in that g/10min or more. delete According to claim 1,
The flame retardant polyvinyl chloride resin has a limiting oxygen index (LOI) of 45 to 60%, CMP flame retardant grade UTP cable. 4. The method of claim 1 or 3,
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 conducting wire among the plurality of first pair units is the shortest first pair CMP flame retardant grade UTP cable, characterized in that the unit is disposed at the diagonal most spaced apart from the second pair unit. 4. The method of claim 1 or 3,
There are two second pair units, a twist pitch of each of the two second pair units is shorter than a twist pitch of each of the plurality of first pair units, and the two second pair units are diagonally spaced apart from each other. CMP flame retardant grade UTP cable, characterized in that it is disposed. 4. The method of claim 1 or 3,
CMP flame retardant grade UTP cable, characterized in that the twist pitch of the first pair unit is 0.6 to 1.2 inches, and the twist pitch of the second pair unit is 0.3 to 0.53 inches. 4. The method of claim 1 or 3,
The transmission speed difference between the first pair unit and the second pair unit is 45 ns or less, CMP flame retardant class UTP cable. 4. The method of claim 1 or 3,
CMP flame retardant grade UTP cable, characterized in that the volume of the insulator forming the second pair unit is 85 to 95% of the volume of the insulator forming the first pair unit. 4. The method of claim 1 or 3,
The polyolefin resin includes a polypropylene block copolymer, and the flame-retardant polyolefin resin composition is based on 100 parts by weight of the base resin, and 30 to 100 parts by weight of a halogen-based flame retardant aid and 5 to 100 parts by weight of an antimony-based flame retardant aid additionally It characterized in that it comprises, CMP flame retardant grade UTP cable. 10. The method of claim 9,
The flame-retardant polyolefin resin composition, based on 100 parts by weight of the base resin, CMP flame-retardant grade UTP cable, characterized in that it further comprises 2 to 10 parts by weight of a reactive polyolefin introduced with a polar group. 4. The method of claim 1 or 3,
The ethylene-α-olefin copolymer comprises a high-density polyethylene resin, CMP flame retardant grade UTP cable. 4. The method of claim 1 or 3,
The metal hydroxide flame retardant is magnesium hydroxide (Mg(OH) ₂ ), CMP flame retardant grade UTP cable, characterized in that it comprises. 13. The method of claim 12,
The metal hydroxide flame retardant is characterized in that the surface is not treated, CMP flame retardant grade UTP cable. 4. The method of claim 1 or 3,
The outer jacket, based on 100 parts by weight of the flame-retardant polyvinyl chloride resin, CMP flame retardant grade UTP cable, characterized in that it further comprises 2 to 5 parts by weight of zinc borate. 4. The method of claim 1 or 3,
The outer jacket is characterized in that the limiting oxygen index (LOI) is 60% or more, CMP flame retardant grade UTP cable. 4. The method of claim 1 or 3,
CMP flame-retardant grade UTP cable, characterized in that it further comprises a separator including a plurality of barrier ribs disposed between each of the plurality of pair units to maintain the arrangement of the plurality of pair units. 4. The method of claim 1 or 3,
CMP flame-retardant grade UTP cable, characterized in that it further comprises a rip code to facilitate the peeling of the outer jacket.

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