WO2016204459A1 - Polypropylene resin composition and cable coated with same - Google Patents

Abstract

The present invention relates to a polypropylene resin composition and a cable coated with the same and, more particularly, to a polypropylene resin composition comprising 25 to 35 % by weight of polypropylene polymer, 15 to 25 % by weight of styrene block copolymer, 15 to 25 % by weight of poly(arylene ether) resin, 26 to 35 % by weight of phosphorus-based flame retardant, and 0 to 10 % by weight of processing additive. The present invention has an effect of providing a polypropylene resin composition and a cable coated with the same, the composition containing less flame retartant but having excellent balance in terms of flame retardancy, electric insulation, processability, and physical properties.

Description

Polypropylene Resin Compositions and Cables Covered With Them

[Reciprocal citation with application (s)]

This application claims the benefit of priority based on Korean Patent Application No. 10-2015-0085817 dated June 17, 2015 and Korean Patent Application No. 10-2016-0071762 dated June 09, 2016. All content disclosed in the literature is included as part of this specification.

The present invention relates to a polypropylene resin composition, and more particularly, to a polypropylene resin composition having a low flame retardant and excellent in balance of flame retardancy, insulation, processability and physical properties, and a cable coated therewith.

Recently, various materials have been introduced to replace PVC in the cable industry. Among them, the olefin resin applied as a cable material has been spotlighted in various fields because of its stable physical properties, relatively wide processing conditions, and excellent insulating properties, and it has a competitive price and stable processability under various conditions regardless of cable size. Molding is possible.

However, there are limitations in implementing such flame retardant properties of olefin resins, and in particular, in the market situation where environmental issues are an issue, implementing flame-retardant properties by introducing a halogen-free flame retardant into an olefin resin is a flame retardant material. Remains a big homework in development.

In order to solve the above problems, for example, Korean Patent Publication No. 10-2010-0017356 uses a metal hydroxide-based flame retardant, but in order to implement sufficient flame retardant properties of the metal hydroxide-based flame retardant is more than 70% level Must be introduced. However, in such a situation, there is a difficulty in implementing the appearance of the cable, which does not solve the fundamental problem of the olefin resin.

In order to solve the problems of the prior art as described above, an object of the present invention is to provide a polypropylene resin composition excellent in balance of flame retardancy, insulation, processability and physical properties while containing less flame retardant.

Another object of the present invention is to provide a cable coated with the polypropylene resin composition.

The above and other objects of the present invention can be achieved by the present invention described below.

In order to achieve the above object, the present invention is 25 to 35% by weight polypropylene polymer, 15 to 25% by weight styrene block copolymer, 15 to 25% by weight poly (arylene ether) resin, 26 to 35% by weight phosphorus flame retardant and It provides a polypropylene resin composition comprising 0 to 10% by weight of the processing additive.

In another aspect, the present invention provides a cable coated with the outermost layer with the polypropylene resin composition.

According to the present invention, there is an effect of providing a polypropylene resin composition having a low flame retardant and excellent balance of flame retardancy, insulation, processability and physical properties and a cable coated therewith.

Hereinafter, the present invention will be described in detail.

The inventors of the present invention apply poly (arylene ether) resins to polypropylene resins in order to satisfy various specifications required for cables, and not only satisfy various specifications required for cables but also realize flame retardant properties without excessive use of flame retardants. It was confirmed that the present invention was completed based on this.

The polypropylene resin composition of the present invention is 25 to 35% by weight polypropylene polymer, 15 to 25% by weight styrene block copolymer, 15 to 25% by weight poly (arylene ether) resin, 26 to 35% by weight phosphorus flame retardant and processing additives It contains 0 to 10% by weight.

Looking at each component constituting the polypropylene resin composition in detail as follows.

The polypropylene polymer is, for example, a polypropylene polymer; Or a copolymer of propylene and at least one olefin selected from the group consisting of ethylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene; and as another example, a polypropylene polymer, It may be at least one selected from the group consisting of polypropylene copolymer, propylene-alpha-olefin copolymer, propylene-ethylene copolymer, propylene-butene copolymer and propylene-ethylene-butene copolymer.

For example, the polypropylene polymer may have an ethylene-butene rubber (EBR) content of 1 to 20% by weight, 1 to 15% by weight, or 5 to 10% by weight, and has excellent insulation in this range.

For example, the polypropylene polymer may have a melt index (230 ° C./2.16 kg) of 16 to 25 g / 10 min, 18 to 25 g / 10 min, or 20 to 25 g / 10 min, and have physical properties within this range. Excellent balance and excellent workability.

The polypropylene polymer may be, for example, 25 to 35% by weight, or 27 to 33% by weight based on the total weight of the resin composition according to the present invention, and has an excellent balance of insulation and physical properties within this range.

The polypropylene polymer may be prepared by conventional methods, and in particular, propylene may be copolymerized with a-olefin in a bulk, slurry or gas phase polymerization reaction in the presence of a suitable catalyst.

The polypropylene polymer may be, for example, a polypropylene random copolymer or a block copolymer, preferably a polypropylene random copolymer.

In the polypropylene random copolymer, for example, propylene units and comonomer units may be randomly distributed in the final copolymer. As a specific example, it may be uniformly distributed as a single unit in the polypropylene block constituting the polymer chain without forming a block containing only comonomer units, in which case there is an excellent balance of insulation, processability and physical properties. The distribution of comonomers can be adjusted, for example, by changing the process temperature.

The styrene block copolymer is not particularly limited, but, for example, styrene-butadiene copolymer, styrene-ethylene-propylene copolymer, styrene-isoprene copolymer, α-methylstyrene-butadiene copolymer, styrene-butadiene-styrene copolymer, Styrene-ethylene-propylene-styrene copolymer, styrene-ethylene-butylene-styrene copolymer, styrene- (ethylene-butylene / styrene copolymer) -styrene copolymer, styrene-isoprene-styrene copolymer, α-methylstyrene -Butadiene-α-methylstyrene copolymers and variants which selectively hydrogenated them.

As a specific example, the styrene block copolymer may be a styrene-ethylene-butylene-styrene copolymer. The styrene-ethylene-butylene-styrene copolymer may be, for example, a linear polymer compound.

For example, the styrene block copolymer may have a styrene content of 10 to 20% by weight, 10 to 18% by weight, or 10 to 15% by weight, and has excellent elongation and hardness within this range.

The styrene block copolymer may have, for example, a weight average molecular weight of 80,000 to 120,000 g / mol, 85,000 to 115,000 g / mol, or 90,000 to 110,000 g / mol, and excellent flexibility and flowability within this range.

The styrene block copolymer may be, for example, 15 to 25% by weight, or 17 to 23% by weight based on the total weight of the resin composition according to the present invention, and has an excellent balance of processability and physical properties within this range.

The poly (arylene ether) resin is not particularly limited in the case of a poly (arylene ether) resin that can be commonly used as a cable material, as an example of the repeating unit represented by the following [Formula 1] or [Formula 2] alone It may be a polymer or a copolymer including a repeating unit of the following [Formula 1] or [Formula 2].

Ra, R1, R ₂ , R ₃ and R ₄ are substituents of arylene group (Ar) or phenylene group, each independently or simultaneously hydrogen, chlorine, bromine, iodine, methyl, ethyl, propyl, allyl, phenyl, methyl Benzyl, chloromethyl, bromomethyl, cyanoethyl, cyano, methoxy, phenoxy or nitro group, n is an integer of 4 to 20, and Ar is an arylene group having 7 to 20 carbon atoms. In an example, R ₁ and R ₂ may be an alkyl group or an alkyl group having 1 to 4 carbon atoms, and R ₃ and R ₄ may be hydrogen.

The poly (arylene ether) resin may be, for example, a poly (phenylene ether) resin.

The poly (phenylene ether) resin may be a poly (arylene ether) resin including a repeating unit represented by the following [Formula 3] as a specific example.

W, X, Y and Z are each independently or simultaneously hydrogen, chlorine, bromine, iodine, methyl, ethyl, propyl, allyl, phenyl, methylbenzyl, chloromethyl, bromomethyl, cyanoethyl, cyano, memeth Oxy, phenoxy or nitro group, n is an integer of 3 to 1000, an integer of 3 to 100, or an integer of 5 to 60 in the number of repeating units.

The homopolymer of the poly (arylene ether) resin is not particularly limited, but specific examples thereof include poly (2,6-dimethyl-1,4-phenylene) ether, poly (2,6-diethyl-1,4-phenyl Ethylene) ether, poly (2-methyl-6-propyl-1,4-phenylene) ether, poly (2,6-dipropyl-1,4-phenylene) ether, poly (2-ethyl-6propyl- 1,4-phenylene) ether, poly (2,6-dimethoxy-1,4-phenylene) ether, poly (2,6-dichloromethyl-1,4-phenylene) ether, poly (2,6 With dibromomethyl-1,4-phenylene) ether, poly (2,6-diphenyl-1,4-phenylene) ether and poly (2,5-dimethyl-1,4-phenylene) ether It may be at least one selected from the group consisting of.

In addition, the copolymer of the poly (arylene ether) resin is not particularly limited, but specific examples thereof include a copolymer of 2,6-dimethylphenol and 2,3,6-trimethylphenol, 2,6-dimethylphenol and o-cresol It may be a poly (phenylene ether) copolymer having a poly (phenylene ether) structure as the main chain, such as a copolymer of and a copolymer of 2,3,6-trimethylphenol and o-cresol.

The poly (arylene ether) resin is, for example, in addition to the homopolymer and copolymer of the poly (arylene ether) resin, α, β-unsaturated carboxylic acid or derivative thereof, sterin or derivative thereof, unsaturated carboxylic acid or derivative thereof Modified poly (arylene ether) resin obtained by reacting a homopolymer or copolymer of poly (arylene ether) with a homopolymer or copolymer in the presence or absence of an initiator in a molten, solution or slurry state at a temperature of 30 to 350 ° C. Can be.

For example, the poly (arylene ether) resin has an intrinsic viscosity (0.5 g / dl, chloroform solution, measured at 30 ° C.) of 0.25 to 0.50 dl / g, 0.30 to 0.50 dl / g, or 0.35 to 0.45 dl / g. It may be within range.

The poly (arylene ether) resin may be 15 to 25% by weight, 15 to 23% by weight, or 15 to 20% by weight based on the total weight of the resin composition according to the present invention, for example, suitable flame retardant within this range It is desirable because it satisfies the flexibility and elongation at the time of extrusion into the wire while implementing the

The phosphorus flame retardant may be, for example, a conventional phosphorus flame retardant used to impart flame retardancy to a synthetic resin or a resin composition. In another example, halogen-based flame retardants may not be used to impart environmentally friendly flame retardancy, and other phosphorus-based flame retardants except red phosphorus may be used.

The phosphorus flame retardant may be at least one selected from the group consisting of, for example, an organometallic phosphinate flame retardant, a nitrogen / phosphorous flame retardant solid at room temperature, and an organic phosphate flame retardant liquid at normal temperature, preferably an organometallic phosphinate It may be at least two selected from the group consisting of a flame retardant, a solid nitrogen / phosphorus flame retardant at room temperature and a liquid organic phosphate flame retardant at room temperature, in this case it is excellent in flame retardancy and processability.

The room temperature may mean a general 22 to 23 ℃, or 20 to 26 ℃.

The phosphorus-based flame retardant may be, for example, 26 to 35% by weight, 27 to 33% by weight, or 28 to 32% by weight based on the total weight of the resin composition according to the present invention. have.

The organometallic phosphinate-based flame retardant may be, for example, a metal dialkyl phosphinate, and in particular, may be aluminum diethyl phosphinate, and in this case, a sufficient amount of the flame retardant effect may be exerted, while adversely affecting other physical properties. Not crazy

The organometallic phosphinate-based flame retardant may be, for example, a phosphorus (P) content of 10 to 50% by weight, 15 to 40% by weight, or 20 to 30% by weight. Does not adversely affect

The organometallic phosphinate-based flame retardant may be, for example, 5 to 30% by weight, 10 to 25% by weight or 10 to 20% by weight based on the total weight of the resin composition according to the present invention. Excellent effect.

The nitrogen / phosphorous flame retardant solid at room temperature may be, for example, a nitro-phosphate flame retardant or a phosphate salt flame retardant, and in particular, may be melamine-polyphosphate.

The nitrogen / phosphorous flame retardant solid at room temperature may be, for example, 20 to 60% by weight, 30 to 50% by weight, or 35 to 45% by weight of nitrogen (N). Does not adversely affect physical properties.

As another example, the nitrogen / phosphorous flame retardant solid at room temperature may have a phosphorus (P) content of 5 to 40 wt%, 5 to 30 wt%, or 10 to 20 wt%, while the flame retardant effect is exhibited within this range. It does not adversely affect other physical properties.

The nitrogen / phosphorous flame retardant solid at room temperature may be, for example, 1 to 25% by weight, 3 to 20% by weight or 5 to 15% by weight based on the total weight of the resin composition according to the present invention. This has an excellent effect.

The organic phosphate flame retardant that is liquid at room temperature may be, for example, bisphenol A bis (dialkyl phosphate), bisphenol A bis (diaryl phosphate) or a mixture thereof, and specific examples may be bisphenol-A-diphenyl phosphate. In this case, as well as flame retardancy, there is an effect of improving the plasticity and surface properties.

The organic phosphate-based flame retardant that is liquid at room temperature may be, for example, 1 to 20% by weight, 3 to 15% by weight, or 5 to 10% by weight, and has excellent plasticity and surface properties within this range. It works.

The organic phosphate flame retardant that is liquid at room temperature may be, for example, 1 to 15% by weight, 1 to 10% by weight, or 3 to 8% by weight based on the total weight of the resin composition according to the present invention. Excellent plasticity and surface properties.

The processing additives include, for example, lubricants, antioxidants, light stabilizers, chain extenders, reaction catalysts, mold release agents, pigments, dyes, antistatic agents, antibacterial agents, processing aids, metal deactivators, depressants, fluorine-based antidropping agents, inorganic fillers, glass It may be at least one selected from the group consisting of fibers, abrasion resistant wear and coupling agents.

The processing additive may be, for example, 0 to 10% by weight, 0.1 to 8% by weight, or 2 to 6% by weight based on the total weight of the resin composition according to the present invention, and excellent workability and balance of properties within this range. There is.

For example, the polypropylene resin composition may have a melt index (230 ° C./2.16 kg) of 1 g / 10 min or more, 1 to 30 g / 10 min, or 2 to 10 g / 10 min. This has an excellent effect.

For example, the polypropylene resin composition may have a tensile strength of 100 kgf / cm ² or more, 100 to 200 kgf / cm ² , or 100 to 125 kgf / cm ² , and has an effect suitable for cable use within this range.

For example, the polypropylene resin composition may have an elongation of 150% or more, 150 to 350%, or 200 to 290%, and has an effect suitable for cable use within this range.

For example, the polypropylene resin composition may have a Shore A hardness of 80 or more, 80 to 95, or 85 to 95, and has an effect suitable for cable use within this range.

In addition, the cable of the present invention is characterized in that the outermost layer is coated with the polypropylene resin composition.

The cable may be, for example, a multi-core cable.

The method of manufacturing the cable is not particularly limited in the case of a cable manufacturing method which usually uses a polypropylene resin composition as an insulating material or a covering material.

Hereinafter, preferred examples are provided to aid the understanding of the present invention, but the following examples are merely for exemplifying the present invention, and it will be apparent to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention. It is natural that such variations and modifications fall within the scope of the appended claims.

EXAMPLE

(A) polypropylene polymer, (B-1 and B-2) styrene block copolymer, (C) poly (arylene ether) resin, (D) phosphorus flame retardant and (E) processing used in Examples and Comparative Examples The additive is as follows.

(A) Polypropylene Polymer (PP)

A polypropylene random copolymer (Polyfuture, product name EC 5082) with an ethylene-butene rubber (EBR) content of 7% and a melt index (230 ° C./2.16 kg) of 23 g / 10 min was used.

(B-1) Styrene Block Copolymer (SBC 1)

A SEBS (styrene-ethylene-butylene-styrene) copolymer (Kraton, product name SEBS G 1657) having a styrene content of 13% and a weight average molecular weight of 105,000 g / mol was used.

(B-2) Styrene Block Copolymer (SBC 2)

A SEBS (styrene-ethylene-butylene-styrene) copolymer (LCY Chemical, product name LCY 9557) having a styrene content of 13% and a weight average molecular weight of 100,000 g / mol was used.

(C) poly (arylene ether) resin (PPE)

Poly (phenylene ether) resin (Mitsubishi Enginnering Plastics, product name PX 100F) having a viscosity of 0.38 ± 0.02 dl / g was used.

(D) Phosphorus Flame Retardant (FR)

Aluminum diethyl phosphinate (Clariant, product name OP 1230) with a phosphorus content of 23 to 24%, bisphenol-A-diphenylphosphate (Adeka, product name FP-600) as a liquid organic phosphate flame retardant at room temperature, and solid phase at room temperature As phosphorus nitrogen / phosphorus flame retardant, a mixture of melamine-polyphosphate (DOOBON, product name NONFLA 601) having a nitrogen content of 39 to 42% and a phosphorus content of 14 to 17% was used.

(E) Processing Additives

Lubricants and antioxidants were used in combination.

Example 1

(A) 30% by weight polypropylene polymer, (B-1) 20% by weight styrene block copolymer, (C) 17% by weight poly (arylene ether) resin, (D) 30% by weight phosphorus flame retardant (aluminum diethyl force) 15% by weight of pinate, 6% by weight of bisphenol-A-diphenylphosphate and 9% by weight of melamine-polyphosphate) and 3% by weight of (E) processing additives were mixed using a super mixer and used with a twin screw extruder. To melt and kneaded in the 200 to 290 ℃ section to prepare a resin composition in the form of pellets through an extrusion process.

After drying the prepared resin composition in the form of pellets for 4 hours at 80 ℃ and left at room temperature for 1 day, using a wire coating extruder (19 Ø HAAKE extruder of Thermo Scientific, Germany) Extrusion Conditions Cable specimens were prepared by extruding at a speed of 80 rpm and 30 m / min at 230 to 260 ° C.

Example 2

Except for using the same amount of the (B-2) styrene block copolymer instead of the (B-1) styrene block copolymer in Example 1 was carried out in the same manner as in Example 1.

Example 3

As shown in Table 1, in Example 1, (A) 25% by weight polypropylene polymer, (B-1) 20% by weight styrene block copolymer, (C) 17% by weight poly (arylene ether) resin, (D ) The process was carried out in the same manner as in Example 1, except that 35 wt% of phosphorus flame retardant and 3 wt% of (E) processing additive were used.

Comparative Example 1

Without using (C) poly (arylene ether) resin in Example 1, (A) 38% by weight polypropylene polymer, (B-1) 25% by weight styrene block copolymer, (D) phosphorus flame retardant 35% Except for mixing using 20% by weight of aluminum diethyl phosphinate, 10% by weight of bisphenol-A-diphenylphosphate and 5% by weight of melamine-polyphosphate) and 2% by weight of (E) processing additives. It carried out by the same method as Example 1.

Comparative Example 2

In Example 1 (A) 30% by weight polypropylene polymer, (B-1) 20% by weight styrene block copolymer, (C) 30% by weight poly (arylene ether) resin, (D) 17% by weight phosphorus flame retardant (8% by weight of aluminum diethyl phosphinate, 4% by weight of bisphenol-A-diphenylphosphate and 5% by weight of melamine-polyphosphate) and (E) Example 3 except mixing with 3% by weight of processing additives It carried out by the same method as 1.

Comparative Example 3

In Example 1 (A) 20% by weight polypropylene polymer, (B-1) 10% by weight styrene block copolymer, (C) 20% by weight poly (arylene ether) resin, (D) 48% by weight phosphorus flame retardant (20% by weight of aluminum diethyl phosphinate, 20% by weight of bisphenol-A-diphenylphosphate and 8% by weight of melamine-polyphosphate) and (E) Example 2 except mixing with 2% by weight of processing additives. It carried out by the same method as 1.

Comparative Example 4

In Example 1, (A) 20% by weight polypropylene polymer, (B-1) 10% by weight styrene block copolymer, (C) 48% by weight poly (arylene ether) resin, (D) 20% by weight phosphorus flame retardant (Ex) 10% by weight of aluminum diethyl phosphinate, 5% by weight of bisphenol-A-diphenylphosphate and 5% by weight of melamine-polyphosphate) and (E) 2% by weight of processing additives It carried out by the same method as 1.

Comparative Example 5

In Example 1 (A) 15% by weight of the polypropylene polymer, (B-1) 30% by weight of the styrene block copolymer, (C) 30% by weight of the poly (arylene ether) resin, (D) 20% by weight of the phosphorus-based flame retardant Example (except that 10% by weight of aluminum diethyl phosphinate, 5% by weight of bisphenol-A-diphenylphosphate and 5% by weight of melamine-polyphosphate) and (E) 5% by weight of processing additives It carried out by the same method as 1.

Comparative Example 6

In Example 1, (A) 33% by weight of the polypropylene polymer, (B-1) 23% by weight of the styrene block copolymer, (C) 13% by weight of the poly (arylene ether) resin, (D) 25% by weight of the phosphorus flame retardant (12% by weight of aluminum diethyl phosphinate, 8% by weight of bisphenol-A-diphenylphosphate and 5% by weight of melamine-polyphosphate) and (E) Example 6, except mixing using a processing additive It carried out by the same method as 1.

Comparative Example 7

As shown in Table 1, in Example 1 (A) 25% by weight of the polypropylene polymer, (B-1) 20% by weight of the styrene block copolymer, (C) 13% by weight of the poly (arylene ether) resin, (D ) 40% by weight of phosphorus flame retardant (25% by weight of aluminum diethyl phosphinate, 6% by weight of bisphenol-A-diphenylphosphate and 9% by weight of melamine-polyphosphate) and (E) 2% by weight of processing additives Except that was carried out in the same manner as in Example 1.

Comparative Example 8

As shown in Table 1, in Example 1 (A) 25% by weight of the polypropylene polymer, (B-1) 20% by weight of the styrene block copolymer, (C) 15% by weight of the poly (arylene ether) resin, (D 25% by weight of phosphorus flame retardant (20% by weight of aluminum diethyl phosphinate, 6% by weight of bisphenol-A-diphenylphosphate and 9% by weight of melamine-polyphosphate) and (E) 15% by weight of processing additives Except that was carried out in the same manner as in Example 1.

[Test Example]

The physical properties of the cable specimens of the polypropylene resin compositions obtained in Examples 1 to 3 and Comparative Examples 1 to 8 were measured by the following method, and the results are shown in Table 1 below.

How to measure

* Weight average molecular weight: Measured through GPC, the measuring method is as follows.

<Analytical instrument>

-Column: Polymer Lab mixed B X 2

Solvent: Tetrahydrofuran (0.45 ㎛ filtered)

Flow: 1.0 ml / min

Injection volume: 100μL (0.45㎛ filtered)

Running time: 25 min

-Detector: Agilent RI detector

Experimental Process

1) Take an appropriate amount of sample and dissolve in THF at 1mg / ml concentration and filter with 0.45㎛ syringe filter.

2) Inject sample solution to obtain GPC chromatogram.

3) Inject standard solution to obtain GPC chromatogram.

4) Obtain the calibration curve and equation from the chromatogram of the standard solution and substitute the retention time of the sample solution into the equation to obtain the weight average molecular weight of the sample.

* Cable appearance evaluation: The cable extrusion was performed by visual inspection according to the method specified in UL 1581.

Tensile strength (kgf / cm ² ): measured using cable specimens according to the method specified in UL 1581.

Tensile Elongation (%): measured using cable specimens according to the method specified in UL 1581.

* Flame retardant (VW-1): measured using cable specimens according to the method specified in UL 1581.

Melt Index (Melt Index, g / 10 min): Measured according to standard measurement ASTM D1238 (230 ° C./2.16 kg).

* Shore A: Measured according to the standard measurement ASTM D2240.

division		Example			Comparative example
		One	2	3	One	2	3	4	5	6	7	8
(A) PP (% by weight)		30	30	25	38	30	20	20	15	33	25	25
(B-1) SBC 1 (% by weight)		20	-	20	25	20	10	10	30	23	20	20
(B-2) SBC 2 (% by weight)		-	20	-	-	-	-	-	-	-	-	-
(C) PPE (% by weight)		17	17	17	-	30	20	48	30	13	13	15
(D) FR	Aluminum diethyl phosphinate	15	20	20	8	20	10	10	10	12	25	20
	Bisphenol-A-diphenylphosphate	9	10	9	4	20	5	5	5	8	6	6
	Melamine-Polyphosphate	6	5	6	5	8	5	5	5	5	9	9
	Subtotal (wt%)	30	35	35	17	48	20	20	20	25	40	25
(E) Additives		3	3	3	2	3	2	2	5	6	2	15
Mechanical Properties of Cable Specimen
Melt Index (MI 230 ° C / 2.16 kg, g / 10 min)		3	4.5	1.1	17	1.4	2.2	0.4	0.3	11	3.1	5.4
Tensile Strength (at room temperature TS, kgf / cm 2 )		121	104	116	141	88	91	69	93	128	116	101
Tensile Elongation (at room temperature TE,%)		215	271	264	271	141	89	42	167	292	212	234
Shore A		88	90	87	87	92	92	94	90	87	89	88
Flame Retardant (VW-1)		PASS	PASS	PASS	Fail	Pass	Fail	Pass	Pass	Fail	PASS	Fail
Cable extrusion properties
Torque during extrusion (Nm)		19	17	21	22	27	22	31	38	13	24	19
Pressure at extrusion (bar)		35	34	33	42	41	30	27	49	27	40	36
Extrusion Processability		◎	◎	◎	◎	△	△	×	×	○	×	○
* Extrusion processability: The cable was divided into four stages (◎-very good, ○-good, △-normal, ×-bad) based on the appearance quality and productivity.

As shown in Table 1, all of the polypropylene resin compositions of the present invention have an excellent melt index (230 ° C./2.16 kg) of 3 g / 10 min or more, a tensile strength of 100 kgf / cm ² or more, and a tensile strength. It is very flexible with elongation more than 150%, has excellent range of Shore A hardness 80 to 95, and realizes flame retardant properties without excessive use of flame retardant, and passed the flame retardancy test, so that the overall mechanical property and balance between each property are very excellent. I could confirm it. In addition, the poly (arylene ether) resin composition of the present invention is also extruded, the torque required for cable extrusion is 20 Nm or less, the pressure is 35 bar or less, excellent productivity, and the appearance quality of the cable is very good overall extrusion It was confirmed that workability was excellent.

On the other hand, Comparative Example 1 that does not contain a poly (arylene ether) resin was confirmed that the flame retardancy is reduced.

In addition, in the case of Comparative Examples 2, 4, and 5 in which the content of the flame retardant is reduced to below the range of the present invention and the poly (arylene ether) resin is added beyond the range of the present invention, flame retardancy is secured, but mechanical properties are drastically deteriorated. It could be confirmed.

In addition, Comparative Example 3, which reduces the polypropylene polymer and the styrene block copolymer below the scope of the present invention and adds a flame retardant, does not pass the VW-1 test for measuring the flame retardancy due to the poor appearance of the cable. The physical properties such as tensile strength and tensile elongation were also significantly reduced.

In addition, Comparative Example 6 in which the poly (arylene ether) resin and the flame retardant were reduced to less than the scope of the present invention was confirmed to have reduced flame retardancy.

In addition, in Comparative Example 7 using an excessive amount of the phosphorus-based flame retardant and Comparative Example 8 using an excessive amount of the processing additives, it was confirmed that the flame retardancy or extrusion processability and the like are significantly poor.

In conclusion, the polypropylene resin composition of the present invention, when mixing the poly (arylene ether) resin in the polypropylene polymer in a specific range of content, containing a low flame retardant, but excellent in flame retardancy, insulation, processability and physical property balance polypropylene resin composition And it could be confirmed that the sheathed cable can be implemented.

Claims (18)

1. 25 to 35 weight percent polypropylene polymer, 15 to 25 weight percent styrene block copolymer, 15 to 25 weight percent poly (arylene ether) resin, 26 to 35 weight percent phosphorus flame retardant and 0 to 10 weight percent processing additives Polypropylene resin composition, characterized in that.
2. The method of claim 1,

   The polypropylene polymer is a propylene; and a copolymer of ethylene, at least one olefin selected from the group consisting of 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene; polypropylene resin, characterized in that Composition.
3. The method of claim 1,

   The polypropylene polymer is polypropylene resin composition, characterized in that the ethylene-butene rubber (EBR) content of 1 to 20% by weight.
4. The method of claim 1,

   The polypropylene polymer is a polypropylene resin composition, characterized in that the polypropylene random copolymer.
5. The method of claim 1,

   The polypropylene polymer is a polypropylene resin composition, characterized in that the melt index (230 ℃ / 2.16 kg) is 16 to 25.
6. The method of claim 1,

   The styrene block copolymer is a propylene-ethylene-butylene-styrene copolymer, characterized in that the polypropylene resin composition.
7. The method of claim 1,

   The styrene block copolymer is a polypropylene resin composition, characterized in that the styrene content of 10 to 20% by weight.
8. The method of claim 1,

   The styrene block copolymer is a polypropylene resin composition, characterized in that the weight average molecular weight of 80,000 to 120,000 g / mol.
9. The method of claim 1,

   The poly (arylene ether) resin is a polypropylene resin composition, characterized in that the poly (phenylene ether) resin.
10. The method of claim 1,

    The phosphorus flame retardant is a polypropylene resin composition, characterized in that at least one selected from the group consisting of an organometallic phosphinate flame retardant, a solid nitrogen / phosphorus flame retardant at room temperature and an organic phosphate flame retardant liquid at room temperature.
11. The method of claim 10,

    The organometallic phosphinate is a polypropylene resin composition, characterized in that the metal dialkyl phosphinate.
12. The method of claim 10,

    The organic phosphate flame retardant liquid at room temperature is bisphenol A bis (dialkyl phosphate), bisphenol A bis (diaryl phosphate) or a polypropylene resin composition, characterized in that a mixture thereof.
13. The method of claim 1,

    The processing additives include lubricants, antioxidants, light stabilizers, chain extenders, reaction catalysts, release agents, pigments, dyes, antistatic agents, antibacterial agents, processing aids, metal deactivators, depressants, fluorine-based antidropping agents, inorganic fillers, glass fibers, Polypropylene resin composition characterized in that it comprises one or more selected from the group consisting of an anti-wear wear and coupling agent.
14. The method according to any one of claims 1 to 13,

    The polypropylene resin composition is a polypropylene resin composition, characterized in that the melt index (230 ℃ / 2.16 kg) is 1 g / 10 min or more.
15. The method according to any one of claims 1 to 13,

    The polypropylene resin composition is a polypropylene resin composition characterized in that the tensile strength of 100 kgf / cm ² or more.
16. The method according to any one of claims 1 to 13,

    The polypropylene resin composition is a polypropylene resin composition, characterized in that the tensile elongation is 150% or more.
17. The method according to any one of claims 1 to 13,

    The polypropylene resin composition has a Shore A hardness of 80 or more.
18. The outermost layer was coat | covered with the polypropylene resin composition of any one of Claims 1-13.