KR20150135730A - Flame-retardant polyolefin composition and CMP grade UTP cable including insulation prepared by the same - Google Patents

Abstract

The present invention relates to a flame-retardant polyolefin composition and a plenum grade unshielded twisted pair (UTP) cable including an insulator formed from the same. The flame-retardant polyolefin composition provides high flame retardancy of communication plenum (CMP) grade to a UTP cable, has non-excessive thickness and volume of the cable even having enough electrical properties, reduces the manufacturing costs of the cable, and is environmentally friendly. And, provided is a UTP cable of CMP grade including an insulator formed from the same.

Description

Flame-retardant polyolefin compositions and CMP grade UTP cables including insulation prepared from the same, comprising flame retardant polyolefin compositions and insulators formed therefrom,

The present invention relates to a plenum grade unshielded twisted pair (UTP) cable comprising a flame retardant polyolefin composition and an insulator formed therefrom, which can impart a CTP (Communication Plenum) grade high flame retardancy to a UTP cable, A UMP cable of the CMP grade including an environmentally friendly flame retardant polyolefin composition and an insulator formed therefrom, which can reduce the manufacturing cost of the cable without excessively increasing the thickness and the volume of the cable, will be.

A UTP (Unshielded Twisted Pair) cable is a type of signal line that connects the environment of a normal telephone line or a LAN. The UTP cable is used to enclose a plurality of pairs of two insulated copper wires, It is a name given in the meaning of line.

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

As shown in FIG. 1, the four-pair UTP cable has a structure in which four pair units 100 are surrounded by one outer jacket 300. Each of the pair units 100 is formed by twisting conductive wires 111, preferably two conductive wires 110 insulated and coated with an insulator 112 at constant pitches with each other .

Conventionally, the 4-pair UTP cable has a structure in which the insulator 112 is made of polytetrafluoroethylene (PTFE) resin, fluorinated ethylene propylene (FEP) resin, perfluorinated acid ; PFA).

The fluororesin is excellent in flame retardancy and electrical properties, but has a high price, raises the unit price of the cable, has a high viscosity upon melting, and is difficult to melt and mold, resulting in poor processability. In particular, There is a problem that is not friendly.

In order to solve such a problem of the fluororesin, the insulator 112 constituting a part of the pair unit 100 of the plurality of the pair units 100 is called a flame retardant polyethylene (FRPE), a flame retardant polypropylene (Fire- resistant flame retardant polyolefin material such as polypropylene (FRPP), or a double insulation of an inner flame retardant polyolefin and an outer fluororesin.

However, since the conventional flame retardant polyolefin material is a material in which a flame retardant and an additive are mixed with a polyolefin resin in a large amount, dielectric constant and dielectric loss are increased to greatly deteriorate electrical characteristics. In order to overcome this, the thickness and volume of the insulator And as a result, the flame retardancy of the cable is deteriorated.

In case of applying the flame retardant polyolefin material of the related art, it is possible to consider applying the outer jacket 300 as a polyvinylchloride (PVC) material in order to minimize the decrease in the flame retardancy. However, There is a problem that causes it.

Accordingly, it is possible to secure a high flame retardancy of a CMP (Communication Plenum) grade without using an expensive fluororesin without being environmentally friendly, and at the same time, not only does not excessively increase the thickness and volume of the cable , Flame retardant UTP cable including flame retardant insulating material which can reduce the manufacturing cost of UTP cable and insulator made therefrom is desperately required because there is no need to use expensive expensive material for outer jacket due to sufficient flame retardancy .

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

It is also an object of the present invention to provide a CMP grade UTP cable comprising a flame retardant polyolefin composition and an insulator formed therefrom that does not excessively increase the thickness and volume of the cable even though it exhibits both high flame retardancy and sufficient electrical properties do.

Further, the present invention provides a flame retardant polyolefin composition that can reduce the manufacturing cost of a cable because it does not need to use expensive expensive materials in an outer jacket because the insulator shows high flame retardancy, and a CMP grade UTP cable And to provide the above objects.

In order to solve the above problems,

100 parts by weight of a base resin comprising 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, wherein the dielectric constant (@ 1 MHz) is 2.9 or less, the Limited Oxygen Index (LOI) is 30% or more, and the smoke density measured according to ASTM E662 Of not more than 500 and a room temperature elongation of not less than 100% and a room temperature tensile strength of not less than 8.3 MPa as measured according to UL444.

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

The base resin further comprises 2 to 10 parts by weight of a reactive polyolefin having a polar group introduced therein based on 100 parts by weight of the total amount of the base resin.

The reactive polyolefin to which the polar group is introduced is a polypropylene grafted with maleic anhydride or glycidyl methacrylate.

On the other hand, the metal hydroxide flame retardant is magnesium hydroxide or aluminum hydroxide whose surface is modified with silane or stearic acid, and the flame retardant polyolefin composition is provided.

The flame-retardant auxiliary is a halogen-based flame-retardant aid, and is contained in an amount of 30 to 100 parts by weight based on 100 parts by weight of the base resin.

The flame retardant polyolefin composition is characterized in that the elongation percentage after heating and the tensile residual rate measured according to UL444 after heating at 100 占 폚 for 2 days are 75% or more, respectively.

Further, a flame retardant polyolefin composition is provided, 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, and an outer jacket surrounding the plurality of pair units; Wherein the plurality of pair units comprises at least one first pair unit formed by twisting a plurality of conductors comprising an insulator formed from the flame retardant polyolefin composition.

Here, the plurality of pair units includes at least one second pair unit formed by twisting a plurality of wires including an insulator formed from a fluororesin, and the CMP flame retardant grade UTP cable is provided.

The present invention also provides a CMP flame retardant UTP cable, wherein the twist pitch of the first pair unit is 0.55 to 1.2 inches and the twist pitch of the second pair unit is 0.3 to 0.5 inches.

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 lead of the plurality of first pair units is the shortest Wherein the one pair unit is disposed at a diagonal line that is most distant from the second pair unit.

Furthermore, it is preferable that the twist pitch of each of the first pair unit and the second pair unit is two, the twist pitch of each of the second pair units is shorter than the twist pitch of each of the first pair units, Wherein the CMP flame retardant UTP cable is disposed at a spaced apart diagonal position.

On the other hand, the first pair unit is four, the outer jacket is formed of a flame retardant polyvinyl chloride resin composition, and the flame retardant polyvinyl chloride resin composition is polyvinyl chloride (PVC) having a polymerization degree of 1,000 to 1,700; 10 to 30 parts by weight of a bromine-based flame retardant, 10 to 30 parts by weight of a phosphorus-based 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 10 to 30 parts by weight of a trimellitate 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- CMP flame retardant grade UTP cable.

Here, the flame-retardant polyvinyl chloride resin composition may contain at least one selected from the group consisting of zinc borate, sodium silicate, molybdenum compound, ammonium phosphate, ammonium carbonate, ammonium polyphosphate, red phosphorus, or a combination thereof, based on 100 parts by weight of the polyvinyl chloride And 5 to 10 parts by weight of a flame retardant additive.

The present invention also provides a CMP flame retardant UTP cable, wherein the brominated flame retardant is tetrabromophthalic anhydride and the phosphorous flame retardant is triphenylphosphate.

The CMP flame retardant UTP cable is characterized in that the flame retardant has no modified surface.

The present invention also provides a CMP flame retardant UTP cable, which further comprises a separator including a plurality of partitions disposed between each of the plurality of pair units to maintain the arrangement of the plurality of pair units.

The present invention also provides a CMP flame retardant UTP cable, which further comprises a rib cord for facilitating the dissipation of the outer jacket.

The flame retardant polyolefin composition according to the present invention has a superior effect of imparting CMP (Communication Plenum) grade high flame retardancy to a UTP cable by replacing a conventional fluorine resin which shows high flame resistance but is expensive, poor processability and is not environmentally friendly .

In addition, the flame-retardant polyolefin composition according to the present invention is environmentally friendly and does not discharge noxious gas such as fluorinated gas during incineration or fire of a flame-retardant UTP cable including an insulator made of the insulator, thereby reducing the cost of the UTP cable And exhibit excellent effects.

Further, although the flame retardant polyolefin composition according to the present invention achieves sufficient flame retardance and electrical properties at the same time, it exhibits an excellent effect of not excessively increasing the thickness and the volume of the cable including the insulator made of the flame retardant polyolefin composition.

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

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

2, the CMP flame retardant UTP cable according to the present invention includes a plurality of conductive wires 110 formed by insulated conductive metal wires 111 insulated by an insulator 112, and preferably two wires 110 are twisted at a constant pitch A plurality of pair units 100 formed as a load and an outer jacket 300 surrounding the plurality of pair units 100.

The standard and the material of the conductive metal wire 111 are in accordance 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 stranded to improve the flexibility of the UTP cable. The outer diameter of the conductive metal wire 111 may be about 0.5 to 0.6 mm when the conductive metal wire 111 is broken, and the small wire diameter may be about 0.203 mm when the conductive metal wire 111 is twisted.

The insulator 112 constituting the at least one pair unit 100 of the plurality of pair units 100 may be made 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 aid, 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. Preferably, from 2 to 10 parts by weight of the reactive polyolefin to which the polar group is introduced for the initial modulus improvement may be included.

The polyolefin resin may preferably be a polypropylene resin, and may be a homopolymer, 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 of the polyolefin resin is lowered, and when the lead wire 110 is twisted to manufacture the pair unit 100, insulator pressing occurs and the scratch resistance is lowered, On the other hand, if it exceeds 90 parts by weight, elongation and flexibility may be lowered.

The thermoplastic polyolefin elastomer resin may be, for example, a thermoplastic elastomer including a copolymer of ethylene and another? -Olefin, for example, an ethylene propylene copolymer or a styrene-ethylene-butylene-styrene copolymer, The thermoplastic elastomer containing the ethylene /? - olefin copolymer is preferable. The reactive polyolefin to which the polar group is introduced is preferably 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, aluminum hydroxide, etc., and may be surface-treated or surface-treated with silane, stearic acid or the like. When the content of the flame retardant is less than 50 parts by weight, the flame retardancy may be insufficient, while when it is more than 150 parts by weight, workability and electrical characteristics may be deteriorated.

The flame-retardant auxiliary may be a halogen-based flame-retardant auxiliary such as a bromine-based flame retardant or an antimony-based flame retardant auxiliary such as antimony trioxide. The halogen-based flame retardant auxiliary may be used in an amount of 30 to 100 parts by weight based on 100 parts by weight of the base resin, 5 to 100 parts by weight.

When the content of the halogen-based flame-retardant auxiliary is less than 30 parts by weight or the content of the antimony-based flame-retardant aid is less than 5 parts by weight, the flame retardancy does not increase. On the other hand, when the content is more than 100 parts by weight, . As the other additives that may be contained in the flame-retardant polyolefin composition, a small amount of a lubricant, an antioxidant, a processing aid and the like may be used depending on other purposes.

The insulator formed by the flame retardant polyolefin composition preferably has a dielectric constant (@ 1 MHz) of 2.9 or less, a critical oxygen index (LOI) of 30% or more, a smoke density (ASTM E662, Flaming mode, Dm) (UL 444), a tensile strength at room temperature of 8.3 MPa (UL444) or more, a stretch ratio and a tensile residual rate after heating of 75% or more (UL444, 100 ° C for 2 days) Properties, mechanical properties, flame retardancy, and transparency.

The flame retardant polyolefin composition imparts a CMP grade flame retardancy to a UTP cable including an insulator formed therefrom and satisfies a sufficient electrical characteristic unlike the conventional flame retardant insulating resin for forming an insulator of a UTP cable so that the thickness and volume Is not excessively increased, and unlike the conventional fluororesin, it is inexpensive to manufacture, has excellent processability, and is environmentally friendly.

3 is a longitudinal sectional structure of a CMP flame retardant grade 4-pair (FRPO: fluororesin = 1: 3) UTP cable according to an embodiment of the present invention, and FIG. 4 is a cross- FIG. 5 is a cross-sectional view of a CMP flameproof grade 4-pair (FRPO) according to an embodiment of the present invention, and FIG. 5 is a cross-sectional structure of a 4-pair (FRPO: fluoropolymer = 2: 6: shows a cross-sectional structure of a 4-pair (FRPO: fluororesin = 4: 0) UTP cable of a CMP flame retardant grade according to an embodiment of the present invention; And a longitudinal sectional structure thereof, respectively.

As shown in FIGS. 2 to 6, the CMP flame-retardant UTP cable according to the present invention has a plurality of the pair units 100 disposed adjacent to each other within one outer jacket 300, A phenomenon of being adversely influenced such as generation of noise in the transmission signal of another adjacent pair unit 100 due to the electromagnetic field formed by the flowing current may occur, that is, a crosstalk phenomenon may occur, and such crosstalk phenomenon may be suppressed or minimized Each pair unit 100 has a structure in which a plurality of lead wires 110 are twisted at different pitches.

As described above, the insulator 112a of the conductor 110a constituting the at least one first pair unit 100a of the plurality of the pair units 100 is formed of the flame-retardant polyolefin composition, The insulator 112b of the conductor 110b constituting the pair unit 100b can be formed of a conventional fluorine resin. Here, the insulating layer formed by the conventional fluorine resin has a room temperature elongation of 200% (UL444) or more, a room temperature tensile strength of 17.2 MPa (UL444) or more, a stretch ratio and tensile strength after heating of 75% Day) or more.

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 the different insulators 112a and 112b has a signal phase difference, And the like.

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 as compared with the flame retardant polyolefin composition having the dielectric constant increased by the addition of the flame retardant, the additive, The problem of the signal phase difference and the arrival time delay of the UTP cable can be suppressed or minimized by designing the UTP cable so as to be shorter than the twist pitch of the unit 100a. 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, The number of the first pair unit 100a may be one to four, and the number of the second pair unit 100b may be zero to three. The plurality of first pair units 100a may be twisted at different pitches, and the plurality of first pair units 100b may be twisted at different pitches.

Particularly, in the four-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 100b having the shortest twist pitch, (100b) are preferably disposed at diagonally spaced positions that are most distant from each other.

In the present invention, the outer jacket 300 is preferably made of a flame retardant resin composition containing 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 of a plenum grade UTP (Unshielded Twisted Pair) cable.

In the UTP cable according to the present invention, when the insulator of all the pair units is formed of the flame retardant polyolefin composition according to the present invention, the flame retardant resin composition constituting the outer jacket 300 may further contain, in addition to polyvinyl chloride (PVC) , Plasticizers, other additives, and the like.

The flame retardant may include brominated flame retardants such as tetrabromophthalic anhydride, phosphorus flame retardants such as triphenyl phosphate, metal hydroxides such as magnesium hydroxide (Mg (OH) ₂ ), aluminum hydroxide (Al (OH) ₃ ) Preferably a combination of these.

Wherein 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 30 parts by weight based on 100 parts by weight of the polyvinyl chloride (PVC) And 20 parts by weight, respectively. When the content of each of the flame retardants is less than the minimum content, the desired flame retardancy can not be exhibited. On the other hand, when the content of each of the flame retardants exceeds the respective maximum content, the tensile strength of the outer jacket 300 is lowered, It can deteriorate the property.

In order to improve the compatibility with polyvinyl chloride (PVC), the surface of the flame retardant may be treated with silane or the like. However, when the outer jacket 300 containing the flame retardant is reduced in surface treatment, It is preferable not to perform the surface treatment of the flame retardant from this viewpoint.

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

Since the flame retardant added to the resin composition constituting the outer jacket 300 may lower the molding processability, water resistance, mechanical performance, etc. of the resin composition during the mass blending, the necessity of mass- Can be lowered. In addition, zinc borate as the flame retardant auxiliary agent can further improve the build-up resistance, which is a characteristic of suppressing the generation of smoke.

When the flame retardant aid 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 improving flame retardancy and improving the ductility can be insufficient, while if it exceeds 10 parts by weight, moldability and mechanical properties of the resin composition may be lowered.

The flame retardant resin composition constituting the outer jacket 300 can improve the limit oxygen index (LOI) to 50 to 65% by adding the flame retardant and the flame retardant auxiliary to the polyvinyl chloride (PVC) It is much cheaper than flame retardant polyvinyl chloride, which has an oxygen index (LOI) of more than 60%.

The flame retardant resin composition constituting the outer jacket 300 may further include a plasticizer in order to recover degraded processability, moldability, and the like due to addition of the flame retardant and the flame retardant auxiliary. The plasticizer may preferably include a trimellitate plasticizer, a bromine-based flame retardant plasticizer, a phosphorus-based flame retardant plasticizer, an adipate-based low-temperature plasticizer, or a combination thereof.

Based on 100 parts by weight of the polyvinyl chloride (PVC), 10 to 30 parts by weight of a trimellitate 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, The plasticizer may be included in an amount of 5 to 20 parts by weight, respectively. If the content of each of the plasticizers is less than the minimum content, the desired processability, moldability, and the like can not be achieved. On the other hand, when the content exceeds the maximum content, the tensile strength of the outer jacket 300 is lowered, It may be discharged or may deteriorate the moldability.

Meanwhile, the flame retardant resin composition constituting the outer jacket 300 may further include a heat stabilizer, an antioxidant, a lubricant, etc., in addition to the base resin, the flame retardant, the flame retardant aid, and the plasticizer.

In the CMP grade UTP cable according to the present invention, the thickness of the outer jacket 300 may differ depending on the material forming the insulator of the pair unit. For example, when the insulator 112 of one to three pair units 100 among the four 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 When the insulator 112 of all of the four pair units 100 is formed from the flame retardant polyolefin composition according to the present invention while the thickness of the outer jacket 300 is between 0.3 and 0.4 mm, preferably about 0.35 mm, May be about 0.45 to 0.55, preferably about 0.5 mm. When the thickness of the outer jacket 300 is increased, 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 transmission properties by the above-described structure, and at the same time, the manufacturing cost of the UTP cable can be reduced.

The flame-retardant UTP cable according to the present invention includes a plurality of pairs of barrier ribs disposed between the plurality of pair units 100 so as to maintain the arrangement of the plurality of pair units 100 in the outer jacket 300 400). ≪ / RTI > The separator 400 functions to improve the structural stability of the UTP cable by stably maintaining the arrangement of the plurality of the pair units 100 and improving the resistance of the outer jacket 300 to the external pressure. The separator 400 may be made of the same material as or different from the material of 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 rib cords 500 are used to facilitate removal of the outer jacket 300 and include a Kevlar aramid yarn, a fiber glass epoxy rod, a fiber reinforced polyethylene (FRP) Polyethylene, high strength fiber, galvanized steel wire, and steel wire, the function as a tensile wire for imparting a tensile strength to the UTP cable can be performed in parallel.

<Examples>

1. Examples of insulators made of a flame-retardant polyolefin composition

end. Manufacturing example

The polyolefin compositions according to the Examples and Comparative Examples were prepared using the twin screw extruder at 210 ° C in the components and contents shown in Table 1 below. Insulator specimens were prepared at 190 ° C using a hot press. The unit of the content shown in Table 1 is 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 Resin 2 30 20 10 30 30 Resin 3 35 Resin 4 3 Flame Retardant 1 100 80 70 160 80 Flame Retardant 2 80 Flame Retarding Agent 1 30 40 40 40 30 110 Flame Retarding Agent 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: 10 g / 10 min (2.16 kg, @ 230 DEG C), density: 0.91, Tm: 165 DEG C)

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

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

Resin 4: Homopolypropylene grafted with maleic anhydride (MFR: 0.9 g / 10 min (2.16 kg, @ 230 ° C), density: 0.9)

Flame Retardant 1: Magnesium hydroxide surface-treated with a lubricant

Flame Retardant 2: Magnesium hydroxide surface-treated with silane

Flame Retarding Agent 1: Bromine Flame Retardant

Flame Retarding Agent 2: Antimony Trioxide

I. Property evaluation

(1) Evaluation of mechanical properties

The elongation percentage of the insulation specimen should be not less than 100% when evaluated according to the standard UL444, and the melt flow rate (MFR) (2.16 kg, @ 230 ° C) measured according to ASTM D1238 of the composition before preparation of the specimen is 5 g / 10 min Or more.

(2) Evaluation of dielectric constant

In order to satisfy sufficient electrical properties, the dielectric constant should be 2.9 or less.

(3) Evaluation of flame retardancy

The LOI of the insulating material shall be not less than 30%, and the specimen 2 mm shall have a smoke density (ASTM E662, Flaming mode, Dm) of 500 or less.

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 rate % 150 300 350 85 120 250 Melt flow rate g / 10 min 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 hard polypropylene resin and contained a small amount of soft elastomer resin, so that the elongation percentage of the insulating watch composition was less than 100% and insulator of Comparative Example 2 was insufficient Comparative Example 3 contained an excess amount of the halogen-based flame retardant aid to significantly suppress the smoke-retarding performance of the smoke-retarding agent to 500 and the melt flow rate to 5 g / m &lt; 2 &gt; 10min, respectively.

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

2. Examples of outer jacket and UTP cable

end. Manufacturing example

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

I. Property evaluation

(1) Evaluation of mechanical properties

The tensile strength and elongation of the outer jacket were measured in accordance with UL444, and the tensile strength was 1.76 kgf / ㎟ or more and elongation was 100% or more.

(2) Evaluation of flame retardancy

Flame propagation and flammability were measured in accordance with NFPA 262 standard. Flame propagation, which indicates flame retardancy, should be less than 5 ft and smoke smoke density, ie peak smoke emission and average smoke emission, less than 0.5 and 0.15, respectively.

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

Number of pair unit insulator Outer jacket UL444 NFPA 262 FEP
Pair unit
(dog) FRPP
Pair unit
(dog) material thickness
(mm) Elongation rate
(%) Seal
burglar
(kgf / mm2) 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%)

(100 parts by weight of a polyvinyl chloride resin, 20 parts by weight of a trimellitate plasticizer, 15 parts by weight of a bromine-based plasticizer, 10 parts by weight of a phosphorus plasticizer, 5 parts by weight of an adipate plasticizer, 20 parts by weight of a tetrabromophthalic anhydride flame retardant, 10 parts by weight of a triphenylphosphate flame retardant, and 80 parts by weight of aluminum hydroxide)

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 show that the polyvinyl chloride (PVC) composition itself constituting the outer jacket has a low limiting oxygen index (LOI) and the composition further contains a flame retardant, (Flame propagation and / or smoke / avg smoke) of the cables were not below the standards, and Comparative Examples 5 and 6 were applied to the polyvinyl chloride (PVC) composition constituting the outer jacket Comparative Examples 7 to 10 showed that flame retardant and / or flame retarding adjuvant was added to the polyvinyl chloride (PVC) composition constituting the outer jacket in an insufficient amount, and the flame retardancy of the cable Flame propagation and / or peak smoke / avg. Smoke were found to be below standards.

On the other hand, the UTP cables of Examples 1 to 3 according to the present invention were found to satisfy the flame propagation and peak smoke / avg smoke according to the NFPA 262 standard, and were also excellent in mechanical properties.

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.

100: Pair unit 300: Outer jacket
400: Separator 500: Lip cord

Claims (19)

100 parts by weight of a base resin comprising 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 retarding auxiliary,
A dielectric constant (@ 1 MHz) of 2.9 or less, a limit oxygen index (LOI) of 30% or more, a smoke density measured according to ASTM E662 of 500 or less, a room temperature elongation of 100% And a tensile strength at room temperature of not less than 8.3 MPa. The method according to claim 1,
Wherein the polyolefin resin is a polypropylene block copolymer and the thermoplastic polyolefin elastomer resin is an ethylene propylene copolymer. 3. The method according to claim 1 or 2,
Wherein the base resin further comprises 2 to 10 parts by weight of a reactive polyolefin having a polar group introduced therein based on 100 parts by weight of the total of the base resin. The method of claim 3,
Wherein the reactive polyolefin into which the polar group is introduced is polypropylene grafted with maleic anhydride or glycidyl methacrylate. 3. The method according to claim 1 or 2,
Wherein the metal hydroxide flame retardant is magnesium hydroxide or aluminum hydroxide whose surface is modified with silane or stearic acid. 3. The method according to claim 1 or 2,
The flame-retardant auxiliary is a halogen-based flame-retardant aid, and is contained in an amount of 30 to 100 parts by weight based on 100 parts by weight of the base resin. 3. The method according to claim 1 or 2,
And a stretch percentage and a tensile residual rate after heating, measured according to UL444 after heating for 2 days at 100 占 폚, are 75% or more, respectively. 3. The method according to claim 1 or 2,
Flame retardant polyolefin composition, which further comprises a lubricant, an antioxidant, a processing aid, or a combination thereof. A plurality of pair units formed by twisting a plurality of conductors including a conductor and an insulator surrounding the conductor, and an outer jacket surrounding the plurality of pair units;
Characterized in that said plurality of pair units comprises at least one first pair unit formed by twisting a plurality of conductors comprising an insulator formed from the flame retardant polyolefin composition according to claim 1 or 2, Rated UTP cable. 10. The method of claim 9,
Wherein the plurality of pair units comprises at least one second pair unit formed by twisting a plurality of conductors including an insulator formed from a fluororesin. 11. The method of claim 10,
Wherein the twist pitch of the first pair unit is 0.55 to 1.2 inches and the twist pitch of the second pair unit is 0.3 to 0.5 inches. 11. The method of claim 10,
Wherein 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 lead among the plurality of first pair units is the shortest, CTP flame retardant grade UTP cable, wherein the unit is disposed at a diagonal line that is most distant from the second pair unit. 11. The method of claim 10,
Wherein the first pair unit and the second pair unit are two each, 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 spaced apart from each other CMP flame retardant grade UTP cable. 10. The method of claim 9,
The first pair unit is four,
The outer jacket is formed from a flame retardant polyvinyl chloride resin composition,
Wherein the flame retardant polyvinyl chloride resin composition comprises polyvinyl chloride (PVC) having a degree of polymerization of 1,000 to 1,700; 10 to 30 parts by weight of a bromine-based flame retardant, 10 to 30 parts by weight of a phosphorus-based 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 10 to 30 parts by weight of a trimellitate 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- CMP flame retardant grade UTP cable. 15. The method of claim 14,
The flame retardant polyvinyl chloride resin composition according to claim 1, wherein the flame retardant polyvinyl chloride resin composition is a flame retardant additive of zinc borate, sodium silicate, molybdenum compound, ammonium phosphate, ammonium carbonate, ammonium polyphosphate, And 5 to 10 parts by weight of a CMP flame retardant UTP cable. 15. The method of claim 14,
Wherein the brominated flame retardant is tetrabromophthalic anhydride and the phosphorous flame retardant is triphenyl phosphate. 15. The method of claim 14,
The flame retardant grade UTP cable of claim 1, wherein the flame retardant is not surface modified. 10. The method of claim 9,
Further comprising a separator including a plurality of partitions disposed between each of said plurality of pair units to maintain the arrangement of said plurality of pair units. 10. The method of claim 9,
Further comprising a lip cord that facilitates removal of the outer jacket. &Lt; RTI ID = 0.0 &gt; A &lt; / RTI &gt;

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