KR20040089207A - Polyethylene Composite for Pipes with High ESCR - Google Patents

Polyethylene Composite for Pipes with High ESCR Download PDF

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KR20040089207A
KR20040089207A KR1020030022872A KR20030022872A KR20040089207A KR 20040089207 A KR20040089207 A KR 20040089207A KR 1020030022872 A KR1020030022872 A KR 1020030022872A KR 20030022872 A KR20030022872 A KR 20030022872A KR 20040089207 A KR20040089207 A KR 20040089207A
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South Korea
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polyethylene
weight
parts
resin composition
metallocene
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KR1020030022872A
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Korean (ko)
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서강원
박지용
김경현
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삼성아토피나주식회사
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Publication of KR20040089207A publication Critical patent/KR20040089207A/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • 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
    • C08L23/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2314/00—Polymer mixtures characterised by way of preparation
    • C08L2314/02—Ziegler natta catalyst
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2314/00—Polymer mixtures characterised by way of preparation
    • C08L2314/06—Metallocene or single site catalysts

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

PURPOSE: A polyethylene resin composition for high pressure pipes is provided to improve the strength against external pressure and the environmental stress cracking resistance and thereby being capable of producing a pipe with drastically reduced thickness. CONSTITUTION: The polyethylene resin composition comprises (A) 100 parts by weight of metallocene-based polyethylene; and (B) 0.01-5 parts by weight of Ziegler-Natta system polyethylene having a molecular weight of 3000 or less. Particularly, the metallocene-based polyethylene has a melt index of 0.1-5g/10min as measured at a load of 5 kg and at a temperature of 190 deg.C by ASTM D 1238 and a density of 940 g/cm3 or more, and is a copolymer having two kinds of molecular weight distribution. The composition may further comprise an acid resistant, an antioxidant, a UV stabilizer and/or processing aids in an amount of up to 1 parts by weight, on the basis of 100 parts by weight of polyethylene.

Description

환경응력균열저항성이 우수한 파이프용 폴리에틸렌 수지조성물{Polyethylene Composite for Pipes with High ESCR}Polyethylene resin composition for pipes with excellent environmental stress cracking resistance {Polyethylene Composite for Pipes with High ESCR}

발명의 분야Field of invention

본 발명은 폴리에틸렌을 주성분으로 한 고압 파이프용 조성물에 관한 것이다. 보다 구체적으로, 본 발명은 메탈로센계 고밀도 폴리에틸렌과 지글러-나타계 폴리에틸렌 저분자량 중합체를 함유하여 우수한 환경응력균열저항성(ESCR성)을 갖는 파이프용 폴리에틸렌 수지조성물에 관한 것이다.The present invention relates to a composition for a high pressure pipe mainly composed of polyethylene. More specifically, the present invention relates to a polyethylene resin composition for pipes containing metallocene-based high density polyethylene and Ziegler-Natta-based polyethylene low molecular weight polymer having excellent environmental stress crack resistance (ESCR).

발명의 배경Background of the Invention

고압용 파이프를 제조하는데 있어서 폴리에틸렌, 특히 넓은 분자량분포도를 갖는 고밀도 폴리에틸렌을 사용하는 기술은 이미 널리 알려져 있다. 고압용 파이프가 안전성과 장기간의 수명을 갖기 위해서는 적정한 환경응력균열저항성(ESCR성)을 유지하면서, 토압 등 외부하중에 대하여 매우 높은 내성(외압강도)을 나타내야 한다.Techniques for using polyethylene, in particular high density polyethylene with a broad molecular weight distribution, are already well known in the manufacture of high pressure pipes. In order for the high-pressure pipe to have a long life and safety, it has to show very high resistance (external pressure strength) to external loads such as earth pressure while maintaining appropriate environmental stress cracking resistance (ESCR).

외압강도는 폴리에틸렌의 결정화도에 크게 좌우되는 물성으로 알려져 있다. 폴리에틸렌 자체의 결정화도, 즉 밀도를 높이면 외압강도를 향상시킬 수 있다. 그러나 외압강도가 높아지면, 반대급부적으로 환경응력균열저항성이 현저하게 저하되는 문제점이 있다. 이처럼 고압용 파이프의 외압강도와 환경응력균열저항성(ESCR성)은 서로 상반되는 성질로서, 이 두 성질을 모두 만족시킬 수 있는 수지조성물을 개발한다는 것은 이 분야의 과제가 되어 왔다.External pressure strength is known as a physical property that depends greatly on the degree of crystallinity of polyethylene. Increasing the crystallinity of the polyethylene itself, that is, the density, can improve the external pressure strength. However, when the external pressure increases, there is a problem in that environmental stress cracking resistance is significantly reduced. As such, the external pressure strength and the environmental stress cracking resistance (ESCR) of the high-pressure pipe are opposite to each other, and it has been a problem in this field to develop a resin composition that can satisfy both of these properties.

미세 무기입자를 첨가하여 폴리에틸렌 파이프의 기계적 물성을 향상시키는 방법으로 한국특허출원 제1999-13671호에는 층상조직의 탈크를 첨가한 방법이 소개되었는데, 이러한 조성물은 탈크입자에 의한 외관불량 문제와 상용성의 저하로 인해 탈크 첨가량의 제한이 있으며 따라서 물성개량의 효과가 크지 않은 문제점이 있다.As a method of improving the mechanical properties of polyethylene pipes by adding fine inorganic particles, Korean Patent Application No. 1999-13671 introduces a method of adding talc of a layered structure. Due to the deterioration there is a limit of the amount of talc added and therefore there is a problem that the effect of the physical properties improvement is not large.

본 발명자들은 상기와 같은 문제점을 해결하고자 메탈로센계 고밀도 폴리에틸렌의 높은 결정화도를 이용하고, 저분자량 중합체를 사용하여 현저히 개량된 외압강도와 환경응력균열저항성을 갖는 본 발명의 폴리에틸렌 수지 조성물을 개발하기에 이른 것이다.The present inventors use the high crystallinity of the metallocene-based high-density polyethylene to solve the above problems, and to develop the polyethylene resin composition of the present invention having a significantly improved external pressure strength and environmental stress cracking resistance using a low molecular weight polymer It is early.

본 발명의 목적은 고압 파이프용 폴리에틸렌 수지 조성물을 제공하기 위한 것이다.An object of the present invention is to provide a polyethylene resin composition for high pressure pipe.

본 발명의 다른 목적은 메탈로센계 고밀도 폴리에틸렌의 높은 결정화도를 이용하고, 저분자량 중합체를 사용하여 현저히 개량된 외압강도와 환경응력균열저항성을 갖는 고압 파이프용 폴리에틸렌 수지 조성물을 제공하기 위한 것이다.Another object of the present invention is to provide a polyethylene resin composition for a high pressure pipe using a high degree of crystallization of a metallocene-based high density polyethylene, and having a significantly improved external pressure strength and environmental stress cracking resistance using a low molecular weight polymer.

본 발명의 목적은 외압강도 및 환경응력균열저항성이 현저히 개선되기 때문에 종래의 폴리에틸렌 소재 대비 파이프의 두께를 획기적으로 감소시킬 수 있는 고압 파이프용 폴리에틸렌 수지 조성물을 제공하기 위한 것이다.An object of the present invention is to provide a polyethylene resin composition for a high pressure pipe that can significantly reduce the thickness of the pipe compared to the conventional polyethylene material because the external pressure strength and environmental stress crack resistance is significantly improved.

본 발명의 상기 및 기타의 목적들은 하기 설명되는 본 발명에 의하여 모두 달성될 수 있다.The above and other objects of the present invention can be achieved by the present invention described below.

본 발명의 고압 파이프용 폴리에틸렌 수지 조성물은 (A) 메탈로센계 폴리에틸렌 100 중량부와 (B) 분자량 3000 이하의 지글러-나타계 폴리에틸렌 0.01∼5 중량부를 포함하는 수지조성물에 관한 것이다.The polyethylene resin composition for high pressure pipes of this invention relates to the resin composition containing 100 weight part of (A) metallocene type polyethylenes, and 0.01-5 weight part of (B) Ziegler-Natta type polyethylene of molecular weight 3000 or less.

본 발명에서, 메탈로센계 폴리에틸렌(A)은 에틸렌 호모 중합체와 하나 또는 그 이상의 단량체와의 공중합체를 나타낸다. 사용될 수 있는 단량체로는 예를 들어 부텐-1, 헥센-1, 4-메틸펜텐-1, 옥텐-1과 같은 4∼8개의 탄소원자를 함유하는 선형 또는 분지형 알파 올레핀이 있다. 본 발명에 따른 조성물에 유리하게 사용되는 에틸렌 공중합체의 바람직한 예로는, 에틸렌과 부텐 또는 헥센의 공중합체, 또는 선택적으로 에틸렌과 부텐 또는 헥센 혼합물의 연속 중합에 의하여 얻은 공중합체가 있다.In the present invention, metallocene-based polyethylene (A) denotes a copolymer of an ethylene homopolymer with one or more monomers. Monomers that may be used are, for example, linear or branched alpha olefins containing 4 to 8 carbon atoms, such as butene-1, hexene-1, 4-methylpentene-1, octene-1. Preferred examples of ethylene copolymers used advantageously in the compositions according to the invention are copolymers of ethylene and butene or hexene, or optionally copolymers obtained by continuous polymerization of a mixture of ethylene and butene or hexene.

상기 에틸렌 공중합체는 두 종류의 분자량 분포를 갖는 공중합체가 바람직하다. 특히 에틸렌 및 에틸렌과 부텐의 혼합물을 연속 중합하여 얻은 두 가지 분포를 갖는 공중합체가 매우 적합하다.The ethylene copolymer is preferably a copolymer having two kinds of molecular weight distributions. Particularly suitable are copolymers having two distributions obtained by continuous polymerization of ethylene and a mixture of ethylene and butene.

본 발명에 따른 조성물에 사용되는 폴리에틸렌은 ASTM D 1238에 따라 190℃, 5kg 하중하에서 측정했을 때 0.1g/10분에서 5g/10분의 용융지수를 갖고, ASTM D 1505에 따라 측정한 23℃에서의 밀도가 최소한 940 kg/m3이고, 특히 950 kg/m3이상인 고밀도 폴리에틸렌이 적합하다.The polyethylene used in the composition according to the invention has a melt index of 0.1 g / 10 min to 5 g / 10 min when measured at 190 ° C. and 5 kg load according to ASTM D 1238, and at 23 ° C. measured according to ASTM D 1505. High density polyethylenes having a density of at least 940 kg / m 3 , in particular at least 950 kg / m 3, are suitable.

또한, 상기 저분자량 중합체(B)는 분자량 3000 이하의 지글러-나타계 폴리에틸렌 저분자량 중합체로 에틸렌 호모 중합체와 하나 또는 그 이상의 단량체와의 공중합체이다. 여기서 사용될 수 있는 단량체로는 예를 들어 부텐-1, 헥센-1, 4-메틸펜텐-1, 옥텐-1과 같은 4∼8개의 탄소원자를 함유하는 선형 또는 분지형 알파 올레핀이 사용 가능하다. 저분자량 중합체는 메탈로센계 폴리에틸렌(A) 100 중량부에 대하여 0.01∼5 중량부의 양으로 사용된다.In addition, the low molecular weight polymer (B) is a Ziegler-Natta based polyethylene low molecular weight polymer having a molecular weight of 3000 or less and a copolymer of an ethylene homopolymer and one or more monomers. As the monomer which can be used here, linear or branched alpha olefins containing 4 to 8 carbon atoms such as butene-1, hexene-1, 4-methylpentene-1, octene-1 can be used. The low molecular weight polymer is used in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the metallocene polyethylene (A).

본 발명에 따른 수지 조성물은 안정화제(예를 들어, 내산제, 산화방지제 또는 자외선 안정화제)와 가공 보조제와 같은, 에틸렌 중합체에 사용할 수 있는 첨가제를 함유할 수 있다. 조성물에 이들 첨가제의 함량은 일반적으로 폴리에틸렌 100 중량부에 대하여 1 중량부 이하이고, 바람직하기로는 0.5중량부 이하이다. 또한 본 발명에 따른 조성물은 안료를 함유할 수 있다. 일반적으로 안료의 함량은 폴리에틸렌 100 중량부에 대하여 5 중량부를 초과하지 않고, 특히 3 중량부를 초과하지 않는 것이 바림직하다.The resin composition according to the present invention may contain additives that can be used in ethylene polymers, such as stabilizers (eg, acid resistant, antioxidant or ultraviolet stabilizers) and processing aids. The content of these additives in the composition is generally 1 part by weight or less, preferably 0.5 parts by weight or less, relative to 100 parts by weight of polyethylene. The composition according to the invention may also contain pigments. In general, the content of the pigment is preferably not more than 5 parts by weight, in particular not more than 3 parts by weight, based on 100 parts by weight of polyethylene.

본 발명에 따른 조성물의 제조방법은 일반적인 이축압출기를 이용하여 메탈로센계 고밀도 폴리에틸렌, 분자량 3000 이하의 지글러-나타계 폴리에틸렌, 내산제, 및 산화방지제를 헨셀믹서를 이용하여 균일하게 분산 후 압출기의 주공급부에 넣고 150∼220℃의 온도에서 용융 압출하여 제조한다. 수지 조성물은 압출된 펠렛형태인 것이 바람직하다.According to the present invention, a method of preparing a composition according to the present invention uniformly disperses a metallocene-based high-density polyethylene, a Ziegler-Natta-based polyethylene having a molecular weight of 3000 or less, an acidulant, and an antioxidant by using a Henschel mixer, followed by It is prepared by melting and extruding at a temperature of 150-220 ° C. in the feed. The resin composition is preferably in the form of extruded pellets.

본 발명에 따른 조성물은 직관 또는 스파이럴관과 같은 일반적인 고압용 파이프 제조방법에 모두 사용될 수 있다. 또한 본 발명은 본 발명에 따른 수지조성물로 성형된 파이프에 관한 것으로, 상기 조성물에 의하여 제조된 파이프는 현저히 개량된 외압강도 및 환경응력균열저항성을 나타내기 때문에 종래의 폴리에틸렌 소재 대비 파이프의 두께를 획기적으로 감소시킬 수 있는 장점을 가지게 된다.The composition according to the present invention can be used in all general high pressure pipe production methods such as straight pipe or spiral pipe. In addition, the present invention relates to a pipe molded from the resin composition according to the present invention, because the pipe produced by the composition exhibits significantly improved external pressure strength and environmental stress cracking resistance, significantly reducing the thickness of the pipe compared to the conventional polyethylene material It has the advantage that can be reduced.

본 발명은 하기의 실시예 및 비교실시예에 의하여 보다 구체적으로 이해될 수 있으며, 하기의 실시예는 본 발명을 예시하기 위한 예에 지나지 않으며 본 발명의 보호범위를 제한하는 것은 아니다.The present invention can be understood in more detail by the following examples and comparative examples, the following examples are only examples for illustrating the present invention and do not limit the protection scope of the present invention.

실시예Example

하기의 실시예 및 비교실시예에서 사용된 (A)메탈로센계 폴리에틸렌, (B) 지글러-나타계 폴리에틸렌의 사양은 다음과 같다.Specifications of (A) metallocene polyethylene and (B) Ziegler-Natta polyethylene used in the following Examples and Comparative Examples are as follows.

(A) 메탈로센계 폴리에틸렌: 0.50 g/10분의 MI5와 950kg/m3의 밀도를 갖는 두가지 분자량 분포를 함유하는 메탈로센계 고밀도 폴리에틸렌 파우더를 사용하였다.(A) Metallocene-based polyethylene: A metallocene-based high density polyethylene powder containing two molecular weight distributions having a density of 0.50 g / 10min MI 5 and a density of 950 kg / m 3 was used.

(B) 지글러-나타계 폴리에틸렌: 분자량 3000인 것을 사용하였다.(B) Ziegler-Natta type polyethylene: The thing of molecular weight 3000 was used.

실시예 1Example 1

메탈로센계 고밀도 폴리에틸렌 파우더 100 중량부, 지글러-나타계 폴리에틸렌 0.05 중량부, 카본블랙 2.3 중량부, Phenol계 산화방지제로서 펜타에리티리톨 테트라키스(3-(3,5- 디테트부틸-4-하이드록시페닐)프로피오네이트) 0.05 중량부, Phosphite계 산화방지제로서 트리(2,4-디테트부틸페닐) 포스파이트 0.1 중량부 및 칼슘스테아레이트 0.1 중량부를 혼합하고, 이축압출기(JSW사 제품, 스크류 직경 50mm)로 210℃의 온도에서 과립화하였다. 얻은 과립은 0.50g/10분의 MI5와 959kg/m3의 밀도를 나타내었다. 상기조성물을 압축쉬트 및 단일-스크류형(바텐필드)의 압출기로 200℃의 가공온도에서 파이프를 제조하였다. 수지조성물로 성형된 시편을 상기물성측정 방법에 따라 측정하여 그 결과를 표1에 나타내었다.100 parts by weight of metallocene-based high density polyethylene powder, 0.05 parts by weight of Ziegler-Natta-based polyethylene, 2.3 parts by weight of carbon black, pentaerythritol tetrakis (3- (3,5-ditetbutyl-4- as a phenol-based antioxidant 0.05 parts by weight of hydroxyphenyl) propionate), 0.1 parts by weight of tri (2,4-ditetbutylphenyl) phosphite and 0.1 parts by weight of calcium stearate as a phosphite-based antioxidant, and a twin screw extruder (manufactured by JSW, Granules at a temperature of 210 ° C.). The obtained granules had a MI 5 of 0.50 g / 10 min and a density of 959 kg / m 3 . The composition was piped at a processing temperature of 200 ° C. with an extruded sheet and single-screw (bartenfield) extruder. Specimens molded from resin compositions were measured according to the property measurement method and the results are shown in Table 1.

실시예 2Example 2

지글러-나타계 폴리에틸렌 1 중량부를 사용한 것을 제외하고는 상기 실시예 1과 동일한 방법으로 수행하였다.The same procedure as in Example 1 was carried out except that 1 part by weight of Ziegler-Natta based polyethylene was used.

실시예 3Example 3

지글러-나타계 폴리에틸렌 0.5 중량부를 사용한 것을 제외하고는 상기 실시예 1과 동일한 방법으로 수행하였다.Except that 0.5 parts by weight of Ziegler-Natta based polyethylene was used in the same manner as in Example 1.

비교실시예Comparative Example

지글러-나타계 폴리에틸렌을 함유하지 않는 것을 제외하고는 상기 실시예 1과 동일한 방법으로 수행하였다.The same process as in Example 1 was carried out except that Ziegler-Natta based polyethylene was not contained.

상기 실시예 1-3 및 비교실시예에서 제조된 시편에 대하여 하기의 방법으로 물성을 평가하여 그 결과를 각각 표 1 및 표 2에 나타내었다.The physical properties of the specimens prepared in Examples 1-3 and Comparative Examples were evaluated by the following methods, and the results are shown in Tables 1 and 2, respectively.

(1) 표준밀도(D) : ASTM D 1505에 따라 23℃에서 측정하였다(kg/m3).(1) Standard density (D): measured at 23 ° C. according to ASTM D 1505 (kg / m 3 ).

(2) 용융지수(MI5) : ASTM D 1238에 따라 190℃에서 5kg의 하중하에 측정하였다(g/10분).(2) Melt index (MI 5 ): measured under a load of 5 kg at 190 ° C. in accordance with ASTM D 1238 (g / 10 min).

(3) 외압강도(RS) : 외경 110mm, 두께 10mm의 파이프로 ISO 9969에 의해 측정하였다(kN/m2).(3) External pressure strength (RS): It was measured by ISO 9969 with a pipe having an outer diameter of 110 mm and a thickness of 10 mm (kN / m 2 ).

(4) 인장강도(TS) : 2mm 압축시편으로 ASTM D 638에 의해 항복점 인장강도를측정하였다(kg/cm2).(4) Tensile strength (TS): Yield point tensile strength was measured (kg / cm 2 ) by ASTM D 638 by 2mm compression specimen.

(5) 굴곡강도(FM) : 4mm 압축시편으로 ASTM D 747에 의해 측정하였다(kg/cm2).(5) Flexural strength (FM): measured by ASTM D 747 as a 4mm compressed specimen (kg / cm 2 ).

(6) 환경응력균열저항성(ESCR) : 2mm 압축시편으로 ASTM D 1693에 의해 50% 파괴시점으로 측정하였다(hr).(6) Environmental stress crack resistance (ESCR): 2mm compression specimens were measured at 50% failure time (hr) by ASTM D 1693.

항 목Item 실시예Example 1One 22 33 조성물함량(중량부)Composition content (parts by weight) HDPEHDPE 100100 100100 100100 low-polymerlow-polymer 0.050.05 1One 0.50.5 PHENOL계 산화방지제PHENOL-based antioxidant 0.050.05 0.050.05 0.050.05 PHOSPHITE계 산화방지제PHOSPHITE type antioxidant 0.10.1 0.10.1 0.10.1 칼슘스테아레이트Calcium stearate 0.10.1 0.10.1 0.10.1 카본블랙Carbon black 2.32.3 2.32.3 2.32.3 조성물의기본물성Basic Properties of Composition 용융지수(MI5)Melt Index (MI 5 ) 0.570.57 0.700.70 0.650.65 표준밀도(D)Standard Density (D) 0.9580.958 0.9630.963 0.9590.959 파이프의특성Characteristics of the pipe 외압강도(RS)External pressure strength (RS) 154154 157157 155155 인장강도(TS)Tensile Strength (TS) 276276 271271 270270 굴곡강도(FM)Flexural Strength (FM) 1661016610 1670016700 1660016600 환경응력군열저항성(ESCR)Environmental Stress Group Thermal Resistance (ESCR) 503503 624624 550550

항 목Item 비교실시예Comparative Example 조성물함량(중량부)Composition content (parts by weight) HDPEHDPE 100100 low-polymerlow-polymer -- PHENOL계 산화방지제PHENOL-based antioxidant 0.050.05 PHOSPHITE계 산화방지제PHOSPHITE type antioxidant 0.10.1 칼슘스테아레이트Calcium stearate 0.10.1 카본블랙Carbon black 2.32.3 조성물의기본물성Basic Properties of Composition 용융지수(MI5)Melt Index (MI 5 ) 0.480.48 표준밀도(D)Standard Density (D) 0.9580.958 파이프의특성Characteristics of the pipe 외압강도(RS)External pressure strength (RS) 151151 인장강도(TS)Tensile Strength (TS) 273273 굴곡강도(FM)Flexural Strength (FM) 1670016700 환경응력군열저항성(ESCR)Environmental Stress Group Thermal Resistance (ESCR) 211211

본 발명은 메탈로센계 고밀도 폴리에틸렌의 높은 결정화도를 이용하고, 폴리에틸렌에 몬모릴로나이트가 균일하게 분산되도록 상용화제를 사용하고, 저분자량 중합체를 사용하여 현저히 개량된 외압강도와 환경응력균열저항성을 갖는 고압 성형품, 특히 고압 파이프용 폴리에틸렌 수지 조성물을 제공하고, 외압강도 및 환경응력균열저항성이 현저히 개선되기 때문에 종래의 폴리에틸렌 소재 대비 파이프의 두께를 획기적으로 감소시킬 수 있는 고압 파이프용 폴리에틸렌 수지 조성물을 제공하는 발명의 효과를 갖는다.The present invention uses a high degree of crystallinity of the metallocene-based high-density polyethylene, using a compatibilizer to uniformly disperse montmorillonite in polyethylene, using a low molecular weight polymer having a significantly improved external pressure strength and environmental stress cracking resistance, In particular, the present invention provides a polyethylene resin composition for high-pressure pipes, and since the external pressure strength and environmental stress cracking resistance are remarkably improved, the effect of the present invention provides a polyethylene resin composition for high-pressure pipes that can significantly reduce the thickness of a pipe compared to a conventional polyethylene material. Has

본 발명의 단순한 변형 내지 변경은 이 분야의 통상의 지식을 가진 자에 의하여 용이하게 실시될 수 있으며 이러한 변형이나 변경은 모두 본 발명의 영역에 포함되는 것으로 볼 수 있다.Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (5)

(A) 메탈로센계 폴리에틸렌 100 중량부; 및(A) 100 parts by weight of the metallocene polyethylene; And (B) 분자량 3000 이하의 지글러-나타계 폴리에틸렌 0.01∼5 중량부;(B) 0.01 to 5 parts by weight of Ziegler-Natta based polyethylene having a molecular weight of 3000 or less; 를 포함하는 것을 특징으로 하는 폴리에틸렌 수지 조성물.Polyethylene resin composition comprising a. 제1항에 있어서, 상기 메탈로센계 폴리에틸렌은 용융지수가 ASTM D 1238에 따라 5kg의 하중으로 190℃에서 측정했을 때 0.1∼5g/10분의 범위이며, 밀도가 940 kg/m3이상인 것을 특징으로 하는 폴리에틸렌 수지 조성물.According to claim 1, wherein the metallocene-based polyethylene has a melt index in the range of 0.1 to 5g / 10 minutes when measured at 190 ℃ with a load of 5kg according to ASTM D 1238, characterized in that the density is 940 kg / m 3 or more Polyethylene resin composition. 제1항에 있어서, 상기 메탈로센계 폴리에틸렌은 두 종류의 분자량 분포를 갖는 공중합체인 것을 특징으로 하는 폴리에틸렌 수지 조성물.The polyethylene resin composition of claim 1, wherein the metallocene polyethylene is a copolymer having two kinds of molecular weight distributions. 제1항에 있어서, 내산제, 산화방지제, 자외선 안정화제 및/또는 가공 보조제를 폴리에틸렌 100 중량부에 대하여 1 중량부 이하로 더 함유하는 것을 특징으로 하는 폴리에틸렌 수지 조성물.The polyethylene resin composition according to claim 1, further comprising an acid resistant agent, an antioxidant, an ultraviolet stabilizer and / or a processing aid in an amount of 1 part by weight or less based on 100 parts by weight of polyethylene. 제5항에 있어서, 안료를 폴리에틸렌 100 중량부에 대하여 5 중량부 이하로 더 함유하는 것을 특징으로 하는 폴리에틸렌 수지 조성물.The polyethylene resin composition according to claim 5, further comprising 5 parts by weight or less based on 100 parts by weight of polyethylene.
KR1020030022872A 2003-04-11 2003-04-11 Polyethylene Composite for Pipes with High ESCR KR20040089207A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11925920B2 (en) 2017-11-06 2024-03-12 Hanwha Chemical Corporation Catalyst for hydrogenation of aromatic compound and preparation method therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11925920B2 (en) 2017-11-06 2024-03-12 Hanwha Chemical Corporation Catalyst for hydrogenation of aromatic compound and preparation method therefor

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