KR20030001674A - Composition of semi-conductive high density polyethylene for aerial bundle cable - Google Patents

Composition of semi-conductive high density polyethylene for aerial bundle cable Download PDF

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KR20030001674A
KR20030001674A KR1020010036489A KR20010036489A KR20030001674A KR 20030001674 A KR20030001674 A KR 20030001674A KR 1020010036489 A KR1020010036489 A KR 1020010036489A KR 20010036489 A KR20010036489 A KR 20010036489A KR 20030001674 A KR20030001674 A KR 20030001674A
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density polyethylene
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정영섭
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주식회사 위스컴
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    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
    • C08L91/06—Waxes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
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    • C08L2205/00—Polymer mixtures characterised by other features
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    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/062—HDPE
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    • C08L2207/00—Properties characterising the ingredient of the composition
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Abstract

PURPOSE: Provided is a semiconducting, high density polyethylene composition for processed cable having reinforced long-term reliability and extrusion-processing stability and reduced cost. CONSTITUTION: The semiconducting, high density polyethylene composition comprises 80-100 parts by weight of high density polyethylene, 10-20 part by weight of linear, low density polyethylene, as a base resin, 20-40 parts by weight of carbon black, 0.1-0.6 parts by weight of antioxidant, and 0.5-3 parts by weight of polyethylene wax. The high polyethylene composition is a copolymer of alpha-olefin, and has a density of 0.941-0.945 g/cm3, a melting point of 132-138 deg.C, a melting index(MI) of 0.13-0.72 g/10 min. and a degree of crystallinity of 65-95%.

Description

가공케이블용 반도전 고밀도 폴리에틸렌 조성물{Composition of semi-conductive high density polyethylene for aerial bundle cable}Composition of semi-conductive high density polyethylene for aerial bundle cable

본 발명은 가공케이블용 반도전 고밀도 폴리에틸렌 조성물에 관한 것으로, 보다 상세하게는 베이스 수지로서 고밀도 폴리에틸렌, 선형 저밀도 폴리에틸렌, 카본블랙, 산화방지제, 폴리에틸렌 왁스로 이루어지며, 장기신뢰성 및 압출가공 안정성을 강화시킨 가공케이블용 반도전 고밀도 폴리에틸렌 조성물에 관한 것이다.The present invention relates to a semiconducting high density polyethylene composition for a processed cable, and more particularly, to a base resin, consisting of high density polyethylene, linear low density polyethylene, carbon black, antioxidant, and polyethylene wax, which enhances long-term reliability and extrusion stability. A semiconducting high density polyethylene composition for a working cable.

옥외용 전력케이블(6.6∼22 kv) 급으로 사용하고 있는 가교폴리에틸렌(XLPE)은 베이스 수지인 저밀도 폴리에틸렌(밀도 0.919∼0.926 g/㎤)류에 페놀류 및 에스테르류인 산화방지제, 입경 20 nm 정도의 카본블랙, 가교제, 고급지방산 등을 혼합하여 제조하였다. 가공케이블은 그 구조에 있어서 도체에 차폐층 및 피복체의 두 기능을 갖춘 간단한 구조의 전선이다. 상기 피복체 조성물에는 물성의 증가를 위해 가교제가 함유되어 있으므로 가교제가 분해되지 않는 조건하에서 압출가공을 해야 한다. 만약 절연용 재료(피복체)의 압출가공성이 나쁠 경우, 압출선속을 증가시키지 못하므로 생산성이 저하되고 스코치 현상이 발생할 수 있으며, 이로 인하여 절연체의 물성이 저하된다. 이와 같은 한계성으로 케이블 제조시에 규정된 범위 내에서 압출작업이 이루어져야 하므로 경제적인 측면에서도 제조원가가 상승한다.Cross-linked polyethylene (XLPE), which is used for outdoor power cables (6.6-22 kv), is a low-density polyethylene (density: 0.919-0.926 g / cm3), a base resin, an antioxidant of phenols and esters, and carbon black having a particle size of about 20 nm. It was prepared by mixing a crosslinking agent, a higher fatty acid. The overhead cable is a simple structure of electric wire with two functions, a shielding layer and a sheath on the conductor. Since the coating composition contains a crosslinking agent for increasing physical properties, the coating composition should be extruded under conditions in which the crosslinking agent is not decomposed. If the extrudability of the insulation material (cover) is bad, the extrusion flux may not be increased, and thus productivity may decrease and a scorch phenomenon may occur, thereby deteriorating the physical properties of the insulator. Due to this limitation, the cost of manufacturing increases in economical aspect, since the extrusion work must be carried out within the range specified during cable manufacturing.

또한 종래 제품의 가장 큰 단점은 장기신뢰성의 결여에 있다. 통상적으로 케이블은 그 수명에서 30년 이상의 장기신뢰성을 요구하나, 영토가 협소한 국내에서는 인구가 밀접되어 있는 지역이 많고 가공케이블이 지나가는 구간에 수목이 많아서 수목접촉 등에 의한 피해가 빈번하며, 또한 낙뢰에 의한 피해가 증가하고 있어 이를 방지하기 위한 대책이 시급한 실정이다.In addition, the biggest disadvantage of the conventional products is the lack of long-term reliability. In general, cables require long-term reliability of more than 30 years in their lifetime, but in Korea, where the territories are narrow, there are many areas where populations are close, and there are many trees in the section through which processed cables pass, and damage caused by tree contact is frequent, and lightning strikes are also common. Due to the increasing damage caused by this situation, it is urgent to take measures to prevent this.

대한민국 특허등록 제291668호에서는 가교조제를 혼용함으로써 표면특성을 향상시키고 체적저항율을 낮춘 고압 케이블용 반도전 재료가 개시되어 있고, 또한, 대한민국 특허등록 제291669호에서는 에틸렌 아크릴 고무를 사용함으로써 절연체의 수트리 특성과 절연성능을 향상시킨 고압 내열 케이블용 반도전 재료가 개시되어 있으며, 또한, 대한민국 특허공개 제1998-84543호에서는 폴리에틸렌과 폴리에틸렌왁스의 혼합물을 사용함으로써 내후성 및 절연성을 향상시킨 전선 및 케이블용 폴리에틸렌 블랙 마스터배치 조성물 및 그 제조방법이 개시되어 있으나, 가공케이블의 장기신뢰성 및 압출가공 안정성에 대해서는 기술하지 못하고 있다.Korean Patent Registration No. 291668 discloses a semiconducting material for high-voltage cables that improves surface properties and lowers volume resistivity by using a crosslinking aid. Also, Korean Patent Registration No. 291669 uses ethylene acrylic rubber to reduce the number of insulators. A semiconducting material for a high pressure heat resistant cable having improved tree properties and insulation performance is disclosed. Also, Korean Patent Publication No. 1998-84543 discloses a wire and cable for improving weather resistance and insulation by using a mixture of polyethylene and polyethylene wax. Although a polyethylene black masterbatch composition and a method for producing the same have been disclosed, there is no description on the long-term reliability and the extrusion stability of the processed cable.

따라서, 본 발명의 목적은 장기신뢰성 및 압출가공 안정성을 강화시킨 가공케이블용 반도전 고밀도 폴리에틸렌 조성물을 제공하는 것이다.Accordingly, it is an object of the present invention to provide a semiconducting high density polyethylene composition for a processed cable with enhanced long-term reliability and extrusion stability.

상기한 목적을 달성하기 위하여, 본 발명에서는 종래의 저밀도 폴리에틸렌 대신 고밀도 폴리에틸렌 및 선형 저밀도 폴리에틸렌을 사용하여 경도를 증가시키고, 적절한 물성을 가진 카본블랙의 사용으로 반도전 특성을 부여하여 낙뢰, 단전및 감전사고를 예방함으로써 장기신뢰성을 확보하며, 또한 가공온도 범위가 넓은 고밀도 폴리에틸렌과 적절한 물성을 지닌 카본블랙, 산화방지제 및 폴리에틸렌 왁스를 사용하여 압출가공시의 작업안정성을 개선한 반도전 고밀도 폴리에틸렌 조성물을 제공한다.In order to achieve the above object, the present invention increases the hardness by using high density polyethylene and linear low density polyethylene instead of the conventional low density polyethylene, and imparts anti-conductive properties by using carbon black having appropriate physical properties, such as lightning, electric shock and electric shock. Providing semi-conductive high-density polyethylene composition which secures long-term reliability by preventing accidents and improves work stability during extrusion processing by using high density polyethylene with a wide processing temperature range and carbon black, antioxidant and polyethylene wax having proper physical properties. do.

본 발명은 가공케이블용 반도전 고밀도 폴리에틸렌 조성물에 관한 것으로, 베이스 수지로서 고밀도 폴리에틸렌 80∼100 중량부, 선형 저밀도 폴리에틸렌 10∼20 중량부에 대하여 카본블랙 20∼40 중량부, 산화방지제 0.1∼0.6 중량부, 폴리에틸렌 왁스 0.5∼3 중량부로 이루어진 가공케이블용 반도전 고밀도 폴리에틸렌 조성물에 관한 것이다.The present invention relates to a semiconductive high-density polyethylene composition for working cables, 20 to 40 parts by weight of carbon black and 0.1 to 0.6 parts by weight of antioxidant based on 80 to 100 parts by weight of high density polyethylene, 10 to 20 parts by weight of linear low density polyethylene as a base resin. In addition, the present invention relates to a semiconductive high density polyethylene composition for a work cable comprising 0.5 to 3 parts by weight of polyethylene wax.

고밀도 폴리에틸렌은 고결정성 및 고강도이므로 경도와 내마모성 등이 양호하여 본 발명에서 추구하고자 하는 시스층 보호 용도로 적합하다. 고밀도 폴리에틸렌은 뛰어난 절연성 때문에 전선 및 케이블용 절연소재로 널리 사용되어 왔지만, 결정화도에 따른 가공성 문제로 반도전 조성물을 제품화하기에는 다소 어려움이 있다. 특히, 반도전 조성물 가공시에는 결정화도(밀도)가 분산정도를 결정하는 요인이 될 수 있으므로 세심한 주의가 요구된다. 본 발명에서 사용하는 고밀도 폴리에틸렌은 α-올레핀의 공중합체으로서, 밀도 0.941∼0.945 g/㎤, 융점 132∼138℃, 용융지수(MI) 0.13∼0.72 g/10분, 결정화도 65∼95%의 물성을 가진다.Since high density polyethylene has high crystallinity and high strength, it is suitable for the sheath layer protection application to be pursued by the present invention because of its good hardness and wear resistance. High density polyethylene has been widely used as an insulating material for wires and cables because of its excellent insulation, but it is difficult to commercialize a semiconducting composition due to workability problems due to crystallinity. In particular, when processing the semiconductive composition, careful attention is required because the degree of crystallinity (density) may be a factor determining the degree of dispersion. The high density polyethylene used in the present invention is a copolymer of α-olefin, having a density of 0.941 to 0.945 g / cm 3, a melting point of 132 to 138 ° C., a melt index (MI) of 0.13 to 0.72 g / 10 minutes, and a crystallinity of 65 to 95%. Has

선형 저밀도 폴리에틸렌은 저밀도(LDPE) 범위에 속하면서도 분자구조는 고밀도 폴리에틸렌과 유사하여 고밀도 폴리에틸렌의 단점을 보완할 수 있는 우수한 물성을 지니고 있다. 특히 기계적 특성과 내환경응력균열성(ESCR) 등의 우수하여 반도전 고밀도 폴리에틸렌의 물성을 보완할 수 있다. 따라서, 조성물의 특성을 저하시키지 않는 범위 내에서 선형 저밀도 폴리에틸렌을 선택하는 것이 중요하다. 본 발명에서 사용하는 선형 저밀도 폴리에틸렌은 밀도 0.920∼0.932 g/㎤, 융점 120℃, 용융지수(MI) 1∼4 g/분의 물성을 가진다.The linear low density polyethylene is in the low density (LDPE) range, but the molecular structure is similar to the high density polyethylene, and has excellent physical properties to compensate for the disadvantages of the high density polyethylene. In particular, the mechanical properties and environmental stress cracking resistance (ESCR), etc. can be excellent to complement the properties of semiconducting high density polyethylene. Therefore, it is important to select linear low density polyethylene within the range which does not lower the characteristic of a composition. The linear low density polyethylene used in the present invention has a physical property of density 0.920 to 0.932 g / cm 3, melting point 120 ° C., and melt index (MI) of 1 to 4 g / min.

카본블랙은 반도전 고밀도 폴리에틸렌 제조시에 가장 중요하다. 적절한 카본블랙을 선택해야 가공기계인 반버리믹서에서의 분산성이 우수하다. 만약 카본블랙의 입자크기가 일정 범위를 벗어나면 분산성이 저하되어 전기적 특성 및 기계적 물성에 영향을 미친다. 케이블의 표면평활도도 역시 카본블랙의 분산성에 의해 좌우되므로 카본블랙의 분산성은 케이블의 장기신뢰성을 결정하는 주요 인자이므로 반버리 믹서 가공시에 적절한 투입공정과 혼련시간이 준수되어야 한다. 본 발명에서 사용하는 카본블랙은 퍼니스(furnace) 공법으로 제조된 퍼니스블랙으로서, 금속이온 성분이 적고 전도도가 우수한 것 중에서 입경 20∼40 nm, 비표면적 60∼300 ㎡/g의 물성을 가지는 것이 선택된다.Carbon black is most important in the manufacture of semiconducting high density polyethylene. The proper carbon black should be selected for excellent dispersibility in the Banbury mixer. If the particle size of the carbon black is out of a certain range, the dispersibility is lowered, affecting the electrical properties and mechanical properties. Since the surface smoothness of the cable also depends on the dispersibility of the carbon black, the dispersibility of the carbon black is a major factor in determining the long-term reliability of the cable. The carbon black used in the present invention is a furnace black manufactured by a furnace method, and among those having low metal ion components and excellent conductivity, those having a physical diameter of 20 to 40 nm and a specific surface area of 60 to 300 m 2 / g are selected. do.

일반적으로 고분자에서는 열적 산화 이외에 금속표면과의 접촉, 방사능, 빛 등의 노출로 인하여 산화반응과 유사한 열화가 촉진되므로 산화방지제를 필요로 한다. 특히 케이블에서는 부분방전에 의한 고분자 열화가 발생될 수 있기 때문에 최적의 산화방지제와 함량이 결정되어야 한다. 또한 고밀도 폴리에틸렌에 혼합하여 사용할 경우 상응성에 주의하여야 한다. 즉, 상응성이 좋지 못한 산화방지제를 사용할 경우 분산상태를 기대하기 어렵고, 산화방지제의 양이 많을 경우 고분자 표면으로 이동되어 블루밍(blooming) 현상이 발생하므로 적절한 종류의 산화방지제와 그 함량을 선택하는 것이 중요하다. 이와 같이 산화방지제는 케이블압출과 포설후의 장기신뢰성을 유지하는데 필요한 첨가제이다. 본 발명에서 사용하는 산화방지제는 1차 산화방지제인 페놀계 4,4-티오비스[2-(1,1-디메틸)-5-메틸]페놀 (4,4-thiobis[2-(1,1-dimethyl)-5-methyl]phenol), 2,2-티오-비스(b-t-부틸-p-크레졸) (2,2-thio-bis(b-t-butyl-p-cresol)) 및 2차 산화방지제인 디에테아릴-3,3-티오-디프로피오네이트 (dietearyl-3,3-thio-dipropionate)로 구성된 군에서 선택된다.In general, polymers require antioxidants because thermal degradation similar to the oxidation reaction is promoted due to contact with metal surfaces, radiation, and light, in addition to thermal oxidation. Especially in cables, polymer degradation due to partial discharge can occur, so the optimal antioxidant and content should be determined. Also note the compatibility when used in combination with high density polyethylene. That is, it is difficult to expect the dispersion state when using an antioxidant having poor compatibility, and when the amount of the antioxidant is large, it is moved to the surface of the polymer and blooming occurs, so selecting an appropriate kind of antioxidant and its content It is important. As such, antioxidants are additives necessary to maintain long-term reliability after cable extrusion and laying. The antioxidant used in the present invention is a phenolic 4,4-thiobis [2- (1,1-dimethyl) -5-methyl] phenol (4,4-thiobis [2- (1,1) which is a primary antioxidant. -dimethyl) -5-methyl] phenol), 2,2-thio-bis (bt-butyl-p-cresol) and secondary antioxidants Is selected from the group consisting of dietearyl-3,3-thio-dipropionate.

폴리에틸렌 왁스는 조성물의 혼련을 원할하게 하고, 카본블랙의 분산성을 향상시키며, 가공케이블 제조시에 압출가공 특성을 개선한다. 본 발명에서 사용하는 폴리에틸렌 왁스는 밀도 0.940∼0.950 g/㎤, 연화점 105∼115℃, 평균분자량 3,000∼8,000의 물성을 가지는 저분자량 올레핀수지 또는 저분자량 비닐아세테이트 공중합체이다.Polyethylene wax improves the kneading of the composition, improves the dispersibility of carbon black, and improves the extrusion process properties in the manufacture of finished cables. The polyethylene wax used in the present invention is a low molecular weight olefin resin or a low molecular weight vinyl acetate copolymer having a density of 0.940 to 0.950 g / cm 3, a softening point of 105 to 115 ° C., and an average molecular weight of 3,000 to 8,000.

이하, 실시예를 들어 본 발명을 구체적으로 설명한다.Hereinafter, an Example is given and this invention is demonstrated concretely.

표 1은 본 발명의 실시예 및 비교예를 나타낸 것으로, 실시예 1과 2에서는 비교예 1과 2에서와 달리, 각각 선형 저밀도 폴리에틸렌 20 및 10 중량부를 사용하였으며, 비교예 2에서는 에틸렌 비닐아세테이트 20 중량부를 사용하였다. 전체 중량을 142.7 중량부로 하여 각각의 원료들을 배합하여 반버리 믹서에서 10∼15분간 혼련한 다음 압출제립화하여 최종 가공케이블용 반도전 고밀도 폴리에틸렌을 제조하였다.Table 1 shows examples and comparative examples of the present invention. In Examples 1 and 2, linear low density polyethylene 20 and 10 parts by weight were used, respectively, in Comparative Examples 1 and 2, and in Comparative Example 2, ethylene vinyl acetate 20 was used. Parts by weight were used. The total weight was 142.7 parts by weight, and each of the raw materials was blended and kneaded in a Banbury mixer for 10-15 minutes, followed by extrusion granulation to prepare a semiconducting high density polyethylene for the final finished cable.

원료명(단위: 중량부)Raw material name (unit: parts by weight) 실시예 1Example 1 실시예 2Example 2 비교예 1Comparative Example 1 비교예 2Comparative Example 2 고밀도 폴리에틸렌선형 저밀도 폴리에틸렌에틸렌 비닐아세테이트카본블랙산화방지제 1산화방지제 2폴리에틸렌 왁스High density polyethylene Linear low density polyethylene ethylene vinyl acetate carbon black antioxidant 1 antioxidant 2 polyethylene wax 8020-400.50.228020-400.50.22 9010-400.50.219010-400.50.21 100--400.50.22100--400.50.22 80-20400.50.2280-20400.50.22 합계Sum 142.7142.7 142.7142.7 142.7142.7 142.7142.7

표 2는 제조한 실시예 1과 2 및 비교예 1과2 조성물의 물성을 나타낸 것으로, 여기서 카본블랙의 분산성은 25Φ 압출기를 이용하여 육안으로 판별하였으며, 이때에 압출기 온도는 C1/C2/파이(pie)/헤드(head)가 각각 180/190/195/190℃이었다. 케이블의 평면평활도는 현미경을 이용하여 확인하였으며, 인장강도 및 신장율은 KSC 3004. 19항, 상온체적저항은 IEC 840에 의거 측정하였다.Table 2 shows the physical properties of the prepared Examples 1 and 2 and Comparative Examples 1 and 2, wherein the dispersibility of the carbon black was visually determined using a 25Φ extruder, wherein the extruder temperature was C1 / C2 / Pi ( pie / head were 180/190/195/190 ° C, respectively. The planar smoothness of the cable was checked using a microscope. Tensile strength and elongation were measured in accordance with KSC 3004.19, and room temperature volume resistance in accordance with IEC 840.

항목Item 단위unit 실시예 1Example 1 실시예 2Example 2 비교예 1Comparative Example 1 비교예 2Comparative Example 2 인장강도The tensile strength kg/㎟kg / mm2 2.242.24 2.4622.462 2.672.67 2.022.02 신율Elongation %% 560560 494494 9292 365365 상온체적저항Room Temperature Volume Resistance ΩcmΩcm 4.66×101 4.66 × 10 1 3.42×101 3.42 × 10 1 5.67×102 5.67 × 10 2 7.67×102 7.67 × 10 2 가열후 특성90℃×4일90 ° × 4 days after heating 인장잔율Tensile residual rate %% 104104 112112 8181 8484 신장잔율Elongation %% 9292 7373 5858 6161 경도Hardness DD 6060 6262 6565 5858 카본블랙 분산성Carbon Black Dispersibility -- ○○ ○○ ×× △△ 압출외관(표면평활도)Extrusion appearance (surface smoothness) -- ○○ ○○ ×× 물결무늬발생Moire pattern [주] ○: 좋음, △: 보통, ×: 나쁨[Note] ○: Good, △: Normal, ×: Poor

표 2에서 나타낸 바와 같이, 본 발명의 조성물은 60 D 이상으로 경도가 높으며, 2.2 kg/㎟ 이상으로 인장강도가 높아 케이블의 장기신뢰성을 확보할 수 있었다. 또한, 체적고유저항이 50 Ωcm 이하로 유지됨으로써 국부적인 전기 스트레스 집중을 완화하는 동시에 재료의 노화를 방지할 수 있어 내환경응력균열성 (ESCR)향상에도 상승효과가 있었다. 아울러, 신율 및 가열후 특성이 우수하여 압출가공시에 가공온도 범위가 넓고 압출선속을 증가시킬 수 있으므로 작업의 안정성을 도모할 수 있는 동시에 경제적으로 제조원가를 절감할 수 있었다. 특히, 본 발명의 조성물은 카본블랙 분산성 및 표면평활도가 우수하여 장기신뢰성 및 작업 안정성이 향상되었다.As shown in Table 2, the composition of the present invention has a high hardness of 60 D or more, high tensile strength of 2.2 kg / mm 2 or more was able to secure long-term reliability of the cable. In addition, the volume intrinsic resistance is maintained at 50 Ωcm or less to alleviate local electric stress concentration and to prevent aging of the material, thereby improving the environmental stress cracking resistance (ESCR). In addition, because the elongation and post-heating characteristics are excellent, the processing temperature range is wide during extrusion processing, and the extrusion flux can be increased, thereby improving work stability and economically reducing manufacturing costs. In particular, the composition of the present invention is excellent in carbon black dispersibility and surface smoothness is improved long-term reliability and work stability.

이상 설명한 바와 같이, 본 발명에서는 종래의 저밀도 폴리에틸렌 대신 고밀도 폴리에틸렌(밀도 0.937∼0.955 g/㎤) 및 선형 저밀도 폴리에틸렌(밀도 0.920∼0.935 g/㎤)을 사용하여 경도를 증가시킴으로써, 수목의 접촉으로부터 시스층을 보호할 수 있게 되어 가공케이블의 장기신뢰성을 향상시키는 효과가 있다. 또한 입경 20∼40 nm의 클린 카본블랙을 사용하여 반도전 특성을 부여함으로써 낙뢰, 단선 및 감전사고를 100% 예방할 수 있는 효과가 있다. 또한, 방출방식에서도 본 발명의 반도전 고밀도 폴리에틸렌은 가공온도 범위가 넓어 작업의 안정성 및 압출선속의 증가로 제조원가를 절감할 수 있는 경제적인 이점이 있다.As described above, in the present invention, instead of the conventional low density polyethylene, high hardness polyethylene (density 0.937 to 0.955 g / cm 3) and linear low density polyethylene (density 0.920 to 0.935 g / cm 3) are used to increase the hardness, so that It is possible to protect the layer, thereby improving the long-term reliability of the processed cable. In addition, by using a clean carbon black having a particle diameter of 20 to 40 nm to give a semi-conducting property, there is an effect that can prevent 100% of lightning, disconnection and electric shock. In addition, the semiconductive high-density polyethylene of the present invention in the release method has an economic advantage that can reduce the manufacturing cost due to the wide processing temperature range and the increase of the work stability and extrusion flux.

Claims (6)

베이스 수지로서 고밀도 폴리에틸렌 80∼100 중량부, 선형 저밀도 폴리에틸렌 10∼20 중량부에 대하여 카본블랙 20∼40 중량부, 산화방지제 0.1∼0.6 중량부, 폴리에틸렌 왁스 0.5∼3 중량부로 이루어진 가공케이블용 반도전 고밀도 폴리에틸렌 조성물.Semiconducting for finished cables consisting of 80 to 100 parts by weight of high density polyethylene, 20 to 40 parts by weight of carbon black, 0.1 to 0.6 parts by weight of antioxidant, and 0.5 to 3 parts by weight of polyethylene wax as base resin. High density polyethylene composition. 제 1항에 있어서, 상기 고밀도 폴리에틸렌은 α-올레핀의 공중합체이며, 밀도 0.941∼0.945 g/㎤, 융점 132∼138℃, 용융지수(MI) 0.13∼0.72 g/10분, 결정화도 65∼95%의 물성을 가지는 것을 특징으로 하는 조성물.The method of claim 1, wherein the high-density polyethylene is a copolymer of α-olefin, the density is 0.941 ~ 0.945 g / cm 3, melting point 132 ~ 138 ℃, melt index (MI) 0.13 ~ 0.72 g / 10 minutes, crystallinity 65 ~ 95% Composition having a physical property of. 제 1항에 있어서, 상기 선형 저밀도 폴리에틸렌은 밀도 0.920∼0.932 g/㎤, 융점 120℃, 용융지수(MI) 1∼4 g/분의 물성을 가지는 것을 특징으로 하는 조성물.The composition of claim 1, wherein the linear low density polyethylene has a physical property of a density of 0.920 to 0.932 g / cm 3, a melting point of 120 ° C., and a melt index (MI) of 1 to 4 g / min. 제 1항에 있어서, 상기 카본블랙은 퍼니스(furnace) 공법으로 제조된 퍼니스블랙이며, 금속이온 성분이 적고 전도도가 우수한 것 중에서 입경 20∼40 nm, 비표면적 60∼300 ㎡/g의 물성을 가지는 것이 선택됨을 특징으로 하는 조성물.The method of claim 1, wherein the carbon black is a furnace black manufactured by a furnace (furnace) method, and has a physical property of 20-40 nm, specific surface area 60-300 ㎡ / g of a small metal ion component and excellent conductivity Wherein the composition is selected. 제 1항에 있어서, 상기 산화방지제는 1차 산화방지제인 페놀계 4,4-티오비스[2-(1,1-디메틸)-5-메틸] 페놀, 2,2-티오-비스(b-t-부틸-p-크레졸) 및2차 산화방지제인 디에테아릴-3,3-티오-디프로피오네이트로 구성된 군에서 선택되는 것을 특징으로 하는 조성물.The method of claim 1, wherein the antioxidant is a phenolic 4,4-thiobis [2- (1,1-dimethyl) -5-methyl] phenol, 2,2-thio-bis (bt-) which is a primary antioxidant Butyl-p-cresol) and diethearyl-3,3-thio-dipropionate, which is a secondary antioxidant. 제 1항에 있어서, 상기 폴리에틸렌 왁스는 밀도 0.940∼0.950 g/㎤, 연화점 105∼115℃, 평균분자량 3,000∼8,000의 물성을 가지는 저분자량 올레핀수지 또는 저분자량 비닐아세테이트 공중합체인 것을 특징으로 하는 조성물.The composition according to claim 1, wherein the polyethylene wax is a low molecular weight olefin resin or a low molecular weight vinyl acetate copolymer having a physical property of a density of 0.940 to 0.950 g / cm 3, a softening point of 105 to 115 ° C., and an average molecular weight of 3,000 to 8,000.
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KR101312985B1 (en) * 2011-06-02 2013-10-01 (주)폴리원테크놀로지 Semi-conductive resin composition with antistatic property and preparation method of the same

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KR101010288B1 (en) * 2008-10-21 2011-01-25 주식회사 위스컴 Heat Resistance and retardant Plastic Resin Compositions
KR101312985B1 (en) * 2011-06-02 2013-10-01 (주)폴리원테크놀로지 Semi-conductive resin composition with antistatic property and preparation method of the same

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