KR20030052546A - Polyethylene Resin Composition For Pipe With High Creep Resistance - Google Patents
Polyethylene Resin Composition For Pipe With High Creep Resistance Download PDFInfo
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- KR20030052546A KR20030052546A KR1020010082549A KR20010082549A KR20030052546A KR 20030052546 A KR20030052546 A KR 20030052546A KR 1020010082549 A KR1020010082549 A KR 1020010082549A KR 20010082549 A KR20010082549 A KR 20010082549A KR 20030052546 A KR20030052546 A KR 20030052546A
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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
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/083—Copolymers of ethene with aliphatic polyenes, i.e. containing more than one unsaturated bond
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
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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
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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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
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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Abstract
Description
본 발명은 파이프용 폴리에틸렌 수지 조성물에 관한 것으로, 보다 상세하게는 고밀도 폴리에틸렌과 미세 무기 첨가제를 주성분으로 하고, 이들 사이의 접착성을 높여 주는 상용화제를 함유하는 수지 조성물에 관한 것이다.TECHNICAL FIELD The present invention relates to a polyethylene resin composition for pipes, and more particularly, to a resin composition containing a high-density polyethylene and a fine inorganic additive as a main component, and containing a compatibilizer for enhancing adhesion therebetween.
가압유체 수송용 파이프 또는 파이프 이음구 제조시 폴리에틸렌, 특히 고밀도 폴리에틸렌을 사용하는 것은 널리 알려져 있으며, 이러한 유체수송 파이프가 안전성과 장기 수명을 갖기 위해서는 유체정압에 대하여 매우 높은 내성을 지닐 것이 필수적으로 요구된다.The use of polyethylene, in particular high density polyethylene, in the manufacture of pressurized fluid transport pipes or pipe fittings is widely known, and it is essential that these fluid transport pipes have very high resistance to hydrostatic pressure in order to have safety and long life.
이탈리아 특허 719,725에는 폴리에틸렌을 주성분으로 하는 성형품 제조시 탈크, 카올린 또는 실리카와 같은 미세 무기물을 혼합하여 필름의 안티블로킹 성질을 개량하는 방법이 개시되어 있다.Italian patent 719,725 discloses a method for improving the antiblocking properties of a film by mixing fine inorganics such as talc, kaolin or silica in the production of molded articles based on polyethylene.
대한민국 공개특허 1999-013671에는 고밀도 폴리에틸렌 100중량부당 0.02~1중량부인 소량의 탈크를 첨가하여 내크리프 특성을 개량하는 방법이 개시되어 있다.Korean Patent Laid-Open Publication No. 1999-013671 discloses a method for improving creep resistance by adding a small amount of talc which is 0.02 to 1 part by weight per 100 parts by weight of high density polyethylene.
그러나, 고밀도 폴리에틸렌과 탈크의 단순 혼합시 두 물질사이의 상용성이 떨어져 내크리프 특성의 개량 효과가 크지 않고, 탈크 입자의 크기가 5㎛이상으로 커지고, 탈크의 함량이 1 중량부 이상으로 많아지면 그 효과가 현저히 떨어지는 문제점이 있다.However, when simple mixing of high density polyethylene and talc, the compatibility between the two materials is poor, and the effect of improving creep resistance is not great, the size of the talc particles increases to 5 µm or more, and the content of talc increases to 1 part by weight or more. There is a problem that the effect is significantly reduced.
본 발명은 상기와 같은 종래 기술의 문제점을 해결하기 위한 것으로, 고밀도 폴리에틸렌에 탈크를 혼합하고, 폴리에틸렌과 탈크 사이의 상용성을 향상시키기 위하여, 에틸렌계 불포화 카르복실산, 에틸렌계 불포화 카르복실산 에스테르 및 에틸렌계 불포화 카르복실산 안하이드라이드로 이루어진 군에서 선택된 1 종 이상의 그라프팅 단량체가 폴리에틸렌 주쇄에 그라프팅된 화합물(이하, 상용화제라 한다)을 이용하여, 현저히 개량된 내크리프 특성을 갖는, 폴리에틸렌을 주성분으로 한 파이프용 조성물을 제공함을 그 목적으로 한다.The present invention is to solve the problems of the prior art as described above, in order to mix the talc in the high-density polyethylene, to improve the compatibility between the polyethylene and talc, ethylenically unsaturated carboxylic acid, ethylenically unsaturated carboxylic acid ester And polyethylene having a significantly improved creep resistance using a compound in which at least one grafting monomer selected from the group consisting of ethylenically unsaturated carboxylic acid anhydrides is grafted to the polyethylene backbone (hereinafter referred to as a compatibilizer). It is an object of the present invention to provide a composition for pipes containing the main component thereof.
즉, 본 발명은 (A) ASTM D1505에 따라 23℃에서 측정했을 때 표준밀도가 930kg/㎥ ∼ 1000kg/㎥ 인 폴리에틸렌 100중량부, (B) 탈크 0.01∼5중량부, (C) 에틸렌계 불포화 카르복실산, 에틸렌계 불포화 카르복실산 에스테르 및 에틸렌계 불포화 카르복실산 안하이드라이드로 이루어진 군에서 선택된 1 종 이상의 그라프팅 단량체가 폴리에틸렌 주쇄에 그라프팅된 상용화제 0.01∼20중량부를 포함하는 파이프용 폴리에틸렌 수지 조성물에 관한 것이다.That is, the present invention (A) 100 parts by weight of polyethylene having a standard density of 930 kg / ㎥ ~ 1000kg / ㎥ measured at 23 ℃ according to ASTM D1505, (B) 0.01 to 5 parts by weight of talc, (C) ethylenically unsaturated For pipes comprising 0.01 to 20 parts by weight of a compatibilizer grafted on a polyethylene backbone, wherein the at least one grafting monomer selected from the group consisting of carboxylic acids, ethylenically unsaturated carboxylic acid esters and ethylenically unsaturated carboxylic acid anhydrides is grafted to the polyethylene backbone It relates to a polyethylene resin composition.
이하에서 본 발명을 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail.
본 발명에 있어서, (A)폴리에틸렌은 에틸렌 단독중합체, 에틸렌과 다른 1종 이상의 혼성 단량체와의 공중합체, 또는 이들의 혼합물을 사용할 수 있다. 이 때 상기 혼성 단량체로는 예를 들어 부텐, 헥센과 4-메틸펜텐과 같은 3~8개의 탄소원자를 함유하는 선형 또는 분지형 올레핀과 4-비닐사이클로헥센, 디사이클로펜타디엔, 1,3-부타디엔 등과 같은 4~18개의 탄소원자를 갖는 디올레핀 등을 사용할 수 있으며, 부텐과 헥센이 바람직하다.In the present invention, (A) polyethylene may be an ethylene homopolymer, a copolymer of ethylene with one or more other hybrid monomers, or a mixture thereof. In this case, as the hybrid monomer, for example, linear or branched olefins containing 3 to 8 carbon atoms such as butene, hexene and 4-methylpentene, 4-vinylcyclohexene, dicyclopentadiene, 1,3-butadiene Diolefins having 4 to 18 carbon atoms such as the like, and the like, and butene and hexene are preferable.
에틸렌 공중합체에서 혼성 단량체의 전체 함량은 일반적으로 10몰% 이하 바람직하게는 7몰% 이하로 한다. 좋은 결과는 부텐 또는 헥센 0.05~5몰%, 바람직하게는 0.3~2몰% 함유된 에틸렌 공중합체에서 얻어진다.The total content of the hybrid monomers in the ethylene copolymer is generally 10 mol% or less, preferably 7 mol% or less. Good results are obtained with ethylene copolymers containing 0.05-5 mol%, preferably 0.3-2 mol% butene or hexene.
보다 바람직하게는 에틸렌과 부텐 또는 헥센 혼합물의 연속 중합에 의하여 얻은 두 가지 분자량 분포를 갖는 공중합체가 적합하다.More preferably, copolymers having two molecular weight distributions obtained by continuous polymerization of ethylene and butene or hexene mixtures are suitable.
상기 폴리에틸렌의 표준밀도는 930kg/㎥ ∼ 965kg/㎥, 바람직하게는 940kg/㎥ ∼ 960kg/㎥ 의 범위가 되는 것이 좋다.The standard density of the polyethylene is preferably in the range of 930 kg / m 3 to 965 kg / m 3, preferably 940 kg / m 3 to 960 kg / m 3.
본 발명에 따른 파이프용 조성물에 사용되는 폴리에틸렌은 ASTM D1238에 따른 5kg 하중하에 190℃에서 측정했을때, 용융지수가 3g/10분이하이고, 대체로 1g/10분이하이다.The polyethylene used in the composition for pipes according to the present invention has a melt index of less than 3 g / 10 min and generally less than 1 g / 10 min when measured at 190 ° C. under a 5 kg load according to ASTM D1238.
본 발명에서 (B)탈크는 일반적으로 3MgO·4SiO2·H2O의 자연산인 규산 마그네슘 수화물을 이야기하며, 알루미늄, 철과 탈슘 산화물과 같은 소량의 금속 산화물을 함유할 수 있다. 상기 탈크는 층상조직를 가지며, 평균 입자 크기가 1~15 ㎛인 것을 사용하는 것이 좋다.In the present invention, (B) talc generally refers to a magnesium silicate hydrate which is a natural product of 3MgO.4SiO 2 .H 2 O, and may contain a small amount of metal oxides such as aluminum, iron, and thallium oxide. The talc has a layered structure, it is preferable to use an average particle size of 1 ~ 15 ㎛.
상기 탈크는 폴리에틸렌 100중량부 대비 0.01 ∼ 5 중량부, 바람직하게는 0.05∼3중량부의 범위로 첨가된다. 탈크의 함량이 5 중량부를 초과하면 탈크가 폴리에틸렌의 결정구조를 파괴하면서 열간내압 크리프 내성을 오히려 감소시키고, 0.01 중량부 이하에서는 탈크의 첨가 효과가 없다.The talc is added in an amount of 0.01 to 5 parts by weight, preferably 0.05 to 3 parts by weight, relative to 100 parts by weight of polyethylene. When the content of talc exceeds 5 parts by weight, talc destroys the crystal structure of polyethylene, but rather decreases the hot withstand creep resistance, and at 0.01 parts by weight or less, there is no effect of adding talc.
본 발명에서 (C)상용화제는 에틸렌계 불포화 카르복실산, 에틸렌계 불포화 카르복실산 에스테르 및 에틸렌계 불포화 카르복실산 안하이드라이드로 이루어진 군에서 선택된 1종 이상의 그라프팅 단량체를 폴리에틸렌 주쇄에 통상의 방법으로 그라프팅하여 제조할 수 있다.In the present invention, the (C) compatibilizer is a polyethylene main chain having at least one grafting monomer selected from the group consisting of ethylenically unsaturated carboxylic acid, ethylenically unsaturated carboxylic acid ester and ethylenically unsaturated carboxylic acid anhydride. It can be prepared by grafting by a method.
예를 들어 선형 저밀도 폴리에틸렌 또는 저밀도 폴리에틸렌 또는 고밀도 폴리에틸렌에 상기 그라프팅 단량체 중 1종 이상을 반응 개시제를 이용하여 폴리에틸렌의 용융온도 이상에서 일축 또는 이축 압출기를 통해 압출하거나 배치형 믹서 등과 같은 통상의 용융혼합방식을 이용한 반응압출법에 의해 그라프팅시켜 제조될 수 있으며, 또는 반응기에서 에틸렌 단량체와 상기 그라프팅 단량체 중 1종 이상과 반응개시제를 혼합하여 화학반응 등에 의해 제조될 수 있다.For example, one or more of the above grafting monomers may be extruded to linear low density polyethylene or low density polyethylene or high density polyethylene through a single or twin screw extruder at a melting temperature of polyethylene above the reaction initiator, or a conventional melt mixing such as a batch mixer or the like. It may be prepared by grafting by a reaction extrusion method using the method, or may be prepared by chemical reaction by mixing an ethylene monomer and at least one of the grafting monomers and a reaction initiator in a reactor.
상기 상용화제는 폴리에틸렌 100중량부 대비 0.01∼20중량부, 바람직하게는0.05∼6중량부의 범위로 첨가된다. 상용화제를 20중량부 초과하여 첨가하여도, 탈크와의 상용성은 크게 증가하지 않아 열간내압 크리프 내성의 증가가 없으며, 상용화제 함량이 0.01 중량부 이하에서는 탈크와 폴리에틸렌과의 상용성을 높이지 못해 열간내압 크리프 내성의 증가 효과가 나타나지 않는다.The compatibilizer is added in an amount of 0.01 to 20 parts by weight, preferably 0.05 to 6 parts by weight, relative to 100 parts by weight of polyethylene. Even if more than 20 parts by weight of the compatibilizer is added, the compatibility with talc does not increase significantly and there is no increase in hot break resistance, and when the compatibilizer content is 0.01 parts by weight or less, the compatibility between talc and polyethylene cannot be increased. There is no effect of increasing hot withstand creep resistance.
본 발명에 따른 파이프용 조성물은 탈크와 상용화제 이외에 내산제, 산화방지제, 자외선 안정화제, 가공보조제와 같은 첨가제를 함유할 수 있는데, 전체 조성물중 함량은 1중량% 이하, 보다 바람직하게는 0.5중량% 이하로 한다.Pipe composition according to the present invention may contain additives such as acid, antioxidant, UV stabilizer, processing aid in addition to talc and compatibilizer, the content of the total composition is 1% by weight or less, more preferably 0.5% It should be less than%.
또한 본 발명에 따른 조성물은 안료를 함유할 수 있는데, 조성물중 5중량%이하, 보다 바람직하게는 3중량% 이하로 한다.In addition, the composition according to the present invention may contain a pigment, which is 5% by weight or less, more preferably 3% by weight or less.
본 발명에 따른 조성물의 제조방법은 한정적인 것은 아니다. 조성물은 적당한 공지의 수단으로 얻을 수 있다. 예를 들면, 분말 혼합물 형태로 보통 첨가제와 동시에 폴리에틸렌에 탈크와 상용화제를 혼합할 수 있다. 바람직한 다른 방법은 폴리에틸렌을 실온에서 탈크와 상용화제를 보통 첨가제와 혼합한 다음 이를 예를 들어 기계 혼합기 또는 압출기에서 폴리에틸렌의 융점 이상의 온도에서 혼합하는 것이다. 또한, 폴리에틸렌, 보통의 첨가제와 탈크 및/또는 상용화제를 함유하는 주 마스터배취를 제조하고, 이 주마스터배취를 폴리에틸렌 분말 또는 과립과 계속적으로 혼합한 다음 이를 통상의 용융혼합방식으로 폴리에틸렌의 융점 이상의 온도에서 혼합하여 조성물을 얻는다. 조성물은 압출된 과립형태인 것이 바람직하다.The preparation method of the composition according to the present invention is not limited. The composition can be obtained by any suitable known means. For example, talc and compatibilizers may be mixed in polyethylene in the form of a powder mixture, usually simultaneously with additives. Another preferred method is to mix the polyethylene at room temperature with talc and the compatibilizer with the usual additives and then at a temperature above the melting point of the polyethylene, for example in a mechanical mixer or extruder. In addition, a master masterbatch containing polyethylene, ordinary additives and talc and / or compatibilizers is prepared, and the mastermaster batch is continuously mixed with polyethylene powder or granules and then subjected to conventional melt mixing above the melting point of the polyethylene. Mix at temperature to obtain a composition. The composition is preferably in the form of extruded granules.
본 발명에 따른 조성물은 일반적으로 930kg/㎥ ∼1000kg/㎥의 표준밀도를 나타내고, ASTM D1238에 따라 5kg 하중하에 190℃에서 측정했을 때, 0.07g/10분 ∼ 3g/10분의 용융지수를 나타낸다.The composition according to the invention generally exhibits a standard density of 930 kg / m 3 to 1000 kg / m 3 and a melt index of 0.07 g / 10 min to 3 g / 10 min when measured at 190 ° C. under a 5 kg load according to ASTM D1238. .
본 발명에 따른 조성물은 압출법, 압출-발포 성형법, 압출-열성형법과 사출법과 같은 폴리에틸렌 성형품의 일반적 제조방법에 따라 사용될 수 있으며, 특히, 물, 가스 등과 같은 가압유체의 수송용 파이프의 압출성형 또는 파이프 이음구의 사출성형에 매우 적합하다.The composition according to the present invention can be used according to a general method for producing a polyethylene molded article, such as extrusion, extrusion-foaming, extrusion-thermoforming and injection, and in particular, extrusion of pipes for transporting pressurized fluids such as water and gas. It is also very suitable for injection molding of pipe fittings.
이하, 실시예와 비교예를 통하여 본 발명을 상세하게 설명하나, 이들 실시예는 예시적인 목적이며 이에 의해 본 발명의 보호범위가 제한되는 것으로 해석되어서는 아니된다.Hereinafter, the present invention will be described in detail with reference to examples and comparative examples, but these examples are for illustrative purposes and should not be construed as limiting the protection scope of the present invention.
이 실시예와 비교예에 사용된 기호의 의미, 단위는 다음과 같다.Meanings and units of symbols used in this example and a comparative example are as follows.
1)MI5[g/10분] : ASTM D1238에 따라 190℃에서 5kg의 하중하에 측정한 용융지수.1) MI 5 [g / 10min]: Melt index measured under load of 5kg at 190 ° C in accordance with ASTM D1238.
2)SD[㎏/㎥] : ASTM D1505에 따라 23℃에서 측정한 표준밀도.2) SD [㎏ / ㎥]: Standard density measured at 23 ° C. according to ASTM D1505.
3)t[sec] : 32mm의 직경과 3mm의 두께를 갖는 파이프로 20℃에서 12.4MPa의 후프스 트레스(hoop stress)하에 ISO 1167에 따라 측정한, 파괴시간으로 표시된 내크리프 특성.3) t [sec]: Creep resistance, expressed as breakdown time, measured according to ISO 1167 under a hoop stress of 12.4 MPa at 20 ° C in a pipe with a diameter of 32 mm and a thickness of 3 mm.
4)SCG(Slow Crack Growth)[sec] : 110mm의 직경과 10mm의 두께를 갖는 파이프로 ISO 13479에 기술된 방법에 따른 노치 파이프(notch pipe)에서 80℃에서 4.6MPa의변형력 하에 측정한, 파괴시간으로 표시된, 균열의 저속성장에 대한 내성.4) Slow Crack Growth (sec) [sec]: A pipe with a diameter of 110 mm and a thickness of 10 mm, measured under strain of 4.6 MPa at 80 ° C in a notch pipe according to the method described in ISO 13479. Resistance to slow growth of cracks, expressed in time.
5)RCP(Rapid Crack Propagation)[bar] : 110mm의 직경과 10mm의 두께를 갖는 파이프로 ISO 13477에 기술된 S4 방법에 따라 0℃의 온도에서 측정한, 압력단위로 표시되는, 균열의 빠른 전파에 대한 내성.5) Rapid Crack Propagation (barp) [bar]: Rapid propagation of cracks, expressed in pressure units, measured at a temperature of 0 ° C in accordance with the S4 method described in ISO 13477, with a pipe diameter of 110 mm and a thickness of 10 mm. Resistance to.
<실시예 1><Example 1>
에틸렌 공중합체 96.8중량%, 카본블랙 2.3중량%, 산화방지제 0.5중량%, 스테아르산 칼슘 0.1중량%, KC-2000(한국 KOCH사 제품) 탈크 0.1중량% 및 말레익안하이드라이드 그라프팅 폴리에틸렌 0.2중량%를 배합하여, 이축압출기(JSW사 제품, 스크류 직경 50mm)로 210℃의 온도에서 과립화한 후, 과립을 190℃에서 단일-스크류형(바텐필드)의 압출기로 압출하여 파이프를 제조하였다.96.8% by weight of ethylene copolymer, 2.3% by weight of carbon black, 0.5% by weight of antioxidant, 0.1% by weight of calcium stearate, 0.1% by weight of KC-2000 (manufactured by KOCH, Korea) talc and 0.2% by weight of maleic hydride grafted polyethylene And granulated at a temperature of 210 ° C. with a twin screw extruder (manufactured by JSW, screw diameter 50 mm), and then the granules were extruded at 190 ° C. using an extruder of a single screw type (Battenfield) to prepare a pipe.
상기 에틸렌 공중합체는 50중량부의 에틸렌 동종 중합체와 50중량부의 1몰%의 1-부텐과 에틸렌의 공중합체로 이루어지고, 0.26g/10분의 MI5와 953kg/㎥의 SD를 나타내며, 이봉(Bimodal) 형태의 분자량 분포를 가지는 것을 사용하였다.The ethylene copolymer consists of 50 parts by weight of an ethylene homopolymer and 50 parts by weight of 1-butene and a copolymer of ethylene, exhibits 0.26 g / 10 min MI 5 and 953 kg / m 3 of SD, Bimodal) was used to have a molecular weight distribution.
상기 말레익안하이드라이드 그라프팅 폴리에틸렌는 말레익안하이드라이드와 SD 950kg/㎥, MI50.6g/10분인 고밀도 폴리에틸렌에 반응개시제를 혼합하여 이축압출기에서 용융혼합하여 제조하였으며, 0.4g/10분의 MI5, 951kg/㎥의 SD를 나타내는 것을 사용하였다.The maleic hydride grafted polyethylene was prepared by melt mixing in a twin-screw extruder by mixing a maleic hydride with a high-density polyethylene of SD 950kg / m 3, MI 5 0.6g / 10min, followed by melt-mixing in a 0.4g / 10min MI 5 , Representing an SD of 951 kg / m 3 was used.
상기 탈크는 층상구조이며, 평균입자 크기가 3㎛인 것을 사용하였다.The talc has a layered structure, and an average particle size of 3 μm was used.
조성물의 기본물성 및 파이프의 특성은 표 1에 나타내었다.The basic physical properties of the composition and the properties of the pipes are shown in Table 1.
<실시예 2><Example 2>
실시예 1의 경우와 동일한 에틸렌 공중합체 92.1 중량%, 카본블랙 2.3 중량%, 산화방지제 0.5 중량%, 스테아르산 칼슘 0.1 중량%, 실시예 1에서 사용한 것과 동일한 탈크 2 중량% 및 실시예 1의 경우와 동일한 말레익안하이드라이드 그라프팅 폴리에틸렌 3중량%를 함유하는 조성물을 제조하였다.92.1% by weight of the same ethylene copolymer as in Example 1, 2.3% by weight of carbon black, 0.5% by weight of antioxidant, 0.1% by weight of calcium stearate, 2% by weight of the same talc as used in Example 1 and the case of Example 1 A composition containing 3% by weight of the same maleic hydride grafted polyethylene was prepared.
상기 조성물의 과립화와 과립의 파이프 제조는 실시예 1과 동일한 방법으로 실시하였으며, 조성물의 기본물성 및 파이프의 특성은 표 1에 나타내었다.Granulation of the composition and the preparation of pipes of granules were carried out in the same manner as in Example 1, the basic properties of the composition and the properties of the pipes are shown in Table 1.
<실시예 3><Example 3>
실시예 1의 경우와 동일한 에틸렌 공중합체 96.8 중량%, 카본블랙 2.3 중량%, 산화방지제 0.5 중량%, 스테아르산 칼슘 0.1 중량%, KCM-6100(한국 KOCH사 제품) 탈크 0.1 중량% 및 실시예 1의 경우와 동일한 말레익안하이드라이드 그라프팅 폴리에틸렌 0.2중량%를 함유하는 조성물을 제조하였다.96.8 wt% of the same ethylene copolymer as in Example 1, 2.3 wt% of carbon black, 0.5 wt% of antioxidant, 0.1 wt% of calcium stearate, 0.1 wt% of KCM-6100 (manufactured by KOCH, Korea) and Example 1 A composition containing 0.2% by weight of maleic anhydride grafted polyethylene as in the case of was prepared.
상기 탈크는 층상구조이며, 평균입자 크기가 6㎛인 것을 사용하였다.The talc has a layered structure, and an average particle size of 6 μm was used.
조성물의 기본물성 및 파이프의 특성은 표 1에 나타내었다.The basic physical properties of the composition and the properties of the pipes are shown in Table 1.
상기 조성물의 과립화와 과립의 파이프 제조는 실시예 1과 동일한 방법으로 실시하였으며, 조성물의 기본물성 및 파이프의 특성은 표 1에 나타내었다.Granulation of the composition and the preparation of pipes of granules were carried out in the same manner as in Example 1, the basic properties of the composition and the properties of the pipes are shown in Table 1.
<비교예 1∼3><Comparative Examples 1 to 3>
상용화제를 함유하지 않는 것을 제외하고, 실시예 1∼3과 동일한 조성물을 제조하였다. 상기 조성물의 과립화와 과립의 파이프 제조는 실시예1과 동일한 방법으로 실시하였으며, 조성물의 기본물성 및 파이프의 특성은 표 1에 나타내었다.The same composition as in Examples 1 to 3 was prepared except that no compatibilizer was included. Granulation of the composition and pipe preparation of granules were carried out in the same manner as in Example 1, the basic properties of the composition and the properties of the pipes are shown in Table 1.
표 1의 결과에서 보면, 실시예 1과 비교예 1, 실시예 2와 비교예 2, 실시예 3과 비교예 3을 각각 비교해 보면, 상용화제를 가미한 경우, 유체 정압 내성(내크리프 특성)이 현저히 개량된 파이프를 얻을 수 있음을 알 수 있다.From the results of Table 1, when comparing Example 1 with Comparative Example 1, Example 2, Comparative Example 2, Example 3 and Comparative Example 3, the addition of the compatibilizer, the fluid static pressure resistance (creep resistance characteristics) It can be seen that a significantly improved pipe can be obtained.
더욱이, 실시예 2, 비교예 1, 비교예 2를 비교해 보면 1중량부 이상의 탈크가 함유된 비교예 2의 경우는 약 0.1중량부의 탈크가 함유된 비교예 1의 경우에 비하여 내크리프 특성이 떨어지는 반면 상용화제까지 가미한 실시예 2의 경우는 내크리프 특성이 개량됨을 알 수 있다.Furthermore, when comparing Example 2, Comparative Example 1, and Comparative Example 2, Comparative Example 2 containing 1 part by weight or more of talc contained less creep resistance than Comparative Example 1 containing about 0.1 part by weight of talc. On the other hand, in the case of Example 2 added to the compatibilizer it can be seen that the creep resistance is improved.
또한, 실시예 3과 비교예 3을 비교해 보면, 평균입자크기가 6㎛인 탈크를 함유하는 경우에도 상용화제를 사용한 경우 개량된 내크리프 특성을 나타냄을 알 수 있다.In addition, when comparing Example 3 and Comparative Example 3, it can be seen that even when the compatibilizer is used even when it contains talc having an average particle size of 6 μm, improved creep resistance is exhibited.
본 발명에 따른 조성물은 상용화제없이 탈크만을 함유하는 조성물에 비하여 현저히 개량된 내크리프 특성을 파이프 및 파이프 이음관을 제공할 수 있다.The composition according to the present invention can provide pipes and pipe joints with significantly improved creep resistance compared to compositions containing only talc without compatibilizers.
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