KR20120055420A - Foamed thermoplastic elastomer composition for weather strip - Google Patents
Foamed thermoplastic elastomer composition for weather strip Download PDFInfo
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- KR20120055420A KR20120055420A KR1020100117159A KR20100117159A KR20120055420A KR 20120055420 A KR20120055420 A KR 20120055420A KR 1020100117159 A KR1020100117159 A KR 1020100117159A KR 20100117159 A KR20100117159 A KR 20100117159A KR 20120055420 A KR20120055420 A KR 20120055420A
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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
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J5/00—Doors
- B60J5/04—Doors arranged at the vehicle sides
- B60J5/0412—Lower door structure
- B60J5/0418—Water or sound barrier, e.g. watershields or seals between dry/wet compartment, sound or vibration dampers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/104—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof
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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
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
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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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/14—Peroxides
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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
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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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
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
Abstract
Description
본 발명은 발포 열가소성 탄성체 조성물에 관한 것으로서, 본 발명의 발포 조성물은 내마모성이 우수하므로 탑승자의 반복적인 승하차에 의해 마모가 발생하는 웨더스트립의 표피층에 유용하게 적용할 수 있다.
The present invention relates to a foamed thermoplastic elastomer composition, and the foamed composition of the present invention is excellent in abrasion resistance, and thus can be usefully applied to the skin layer of the weather strip where wear occurs due to repeated riding and unloading of passengers.
웨더스트립은 자동차의 차체와 문 등에 부착되어 차체 내부로의 누수 방지 및 외부소음으로부터 밀봉성을 부여하여 자동차의 쾌적성과 안락성을 부여하는 기능성 부품이다. 웨더스트립은 압출부와 이를 이어주는 조인트부로 이루어지며, 웨더스트립의 요구 성능으로 우수한 내열성, 영구변형성, 내후성, 내오존성 등이 있다.The weather strip is a functional part that is attached to a car body and a door of the car to prevent leakage into the inside of the car and to provide sealing from external noise to provide comfort and comfort of the car. The weather strip is composed of an extrusion part and a joint part connecting the same, and the weather strip has excellent heat resistance, permanent deformation, weather resistance, and ozone resistance.
일반적으로 자동차에 적용되는 웨더스트립용 소재는 대한민국 공개특허 제 10-2003-0008851 호 등에서 제시된 바와 같이, 열경화성 소재인 EPDM 고무(Ethylene Propylene Diene Monomer rubber)를 이용하고 있다. 최근에는 자동차에 적용되는 웨더스트립에 있어서 외관에 나타나는 외관 장식부를 웨더스트립 주위에 장착되는 부품, 예를 들면 천장이나 문의 내장 가니쉬(garnish)의 빛깔과 조화하는 빛깔로 착색하는 것이 실시되고 있다. 그러나, EPDM 고무는 요구하는 빛깔로 착색하는 것이 곤란하기 때문에 대한민국 등록특허 제 10-0463863 호 등에서는 비교적 착색하기가 쉽고 EPDM 고무와 공통의 성질을 갖는 올레핀계 열가소성 탄성체의 착색 시트(sheet)를 웨더스트립의 외관 장식부에 열 융착하여 피복하는 것이 행하여지고 있다. 하지만, 올레핀계 열가소성 탄성체 착색 시트를 사용하더라도 웨더스트립의 발포 표피층은 역시 EPDM 고무 소재로 구성되어 있어 내마모성이 떨어지는 단점이 있었다.
In general, as a material for a weather strip applied to automobiles, as disclosed in Korean Patent Application Publication No. 10-2003-0008851, EPDM rubber (Ethylene Propylene Diene Monomer rubber), which is a thermosetting material, is used. In recent years, in the weather strip applied to automobiles, exterior decorative parts appearing on the exterior are colored with a color that matches the color of parts mounted around the weather strip, for example, ceilings or interior garnishes of doors. However, EPDM rubber is difficult to color in the required color, and according to Korean Patent No. 10-0463863, etc., it is relatively easy to color and weathers the coloring sheet of the olefin-based thermoplastic elastomer having common properties with EPDM rubber. It is thermally fused to coat the exterior decorative part of the strip. However, even when the olefinic thermoplastic elastomer colored sheet is used, the foamed skin layer of the weather strip is also composed of EPDM rubber material, which has a disadvantage of poor wear resistance.
이에 본 발명자들은 상기와 같은 문제점을 해결하기 위해 연구를 거듭한 결과, EPDM 고무와 함께 장쇄분기를 가진 고용융지수의 폴리프로필렌을 함유한 조성물을 개발하였고, 이를 발포시키면 고급감 구현이 가능하고 EPDM 고무 보다 내마모성이 향상된 웨더스트립 표피층을 형성할 수 있음을 알게 되어 본 발명을 완성하였다. 즉, 본 발명은 착색에 의한 고급감 구현 및 내마모성이 향상된 새로운 자동차 웨더스트립용 소재의 제공에 그 목적이 있다.
Accordingly, the inventors of the present invention have repeatedly studied to solve the above problems, and developed a composition containing polypropylene of the high melt melt index having a long chain branch with EPDM rubber, and by foaming it is possible to realize a sense of luxury and EPDM The present invention has been completed by knowing that a weather strip skin layer having improved abrasion resistance than rubber can be formed. That is, an object of the present invention is to provide a new automotive weather strip material with improved color and wear resistance by coloring.
본 발명은The present invention
EPDM 고무 50 ~ 80 중량% 및 장쇄분기 함유 폴리프로필렌 20 ~ 50 중량%를 포함하는 매트릭스 수지 100 중량부에 대하여100 parts by weight of matrix resin comprising 50 to 80% by weight of EPDM rubber and 20 to 50% by weight of long chain branched polypropylene
가교제 0.6 ~ 1 중량부;0.6-1 weight part of crosslinking agent;
가교조제 0.15 ~ 0.5 중량부;0.15 to 0.5 parts by weight of crosslinking aid;
발포제 0.2 ~ 0.5 중량부;0.2 to 0.5 parts by weight of blowing agent;
나노크리스탈 스트럭처 엘라스토머 3 ~ 5 중량부;3 to 5 parts by weight of the nanocrystal structure elastomer;
산화방지제 0.2 ~ 0.6 중량부;0.2 to 0.6 parts by weight of antioxidant;
무기충전제 10 ~ 20 중량부;10 to 20 parts by weight of an inorganic filler;
폴리프로필렌계 왁스 0.3 ~ 0.6 중량부; 및0.3 to 0.6 parts by weight of polypropylene wax; And
프로세스 오일 60 ~ 100 중량부;60 to 100 parts by weight of process oil;
를 포함하는 웨더스트립용 조성물을 그 특징으로 한다.
It features a composition for a weather strip comprising a.
본 발명에 따른 자동차 웨더스트립용 열가소성 탄성체 조성물은 착색이 용이하여 차량 탑승자에게 인테리어 디자인 측면에서 미적 효과를 제공할 수 있을 뿐만 아니라, 차량 탑승자의 반복적인 승하차에 의해 발생 가능한 마모에 대한 내구성을 제고할 수 있다. 특히, 웨더스트립 표피층에 유용하게 적용할 수 있다.
The thermoplastic elastomer composition for automobile weather strip according to the present invention can be easily colored to provide an aesthetic effect to the vehicle occupant in terms of interior design, and to improve durability against wear that may be caused by repeated loading and unloading of the vehicle occupant. Can be. In particular, the present invention can be usefully applied to a weather strip skin layer.
도 1은 바디 웨더스트립의 단면 형상이다.1 is a cross-sectional shape of the body weather strip.
이하에서는 본 발명을 더욱 자세하게 설명하겠다.Hereinafter, the present invention will be described in more detail.
본 발명은 EPDM 고무 및 장쇄분기 함유 폴리프로필렌을 매트릭스 수지로 사용하여 미려한 외관과 우수한 내마모성을 구현하는 자동차 웨더스트립용 조성물에 관한 것이다.The present invention relates to a composition for automobile weather strips using EPDM rubber and long chain branching-containing polypropylene as a matrix resin to realize a beautiful appearance and excellent wear resistance.
상기 EPDM 고무는 매트릭스 수지 중 50 ~ 80중량%로 함유되는 것이 좋다. 함량이 50중량% 미만일 경우에는 제품의 탄성이 떨어지고 감성이 저하될 수 있으며, 80중량%를 초과하는 경우에는 제품의 발포 및 내마모 성능이 떨어지는 문제가 있을 수 있다. 또한, 상기 EPDM 고무는 125℃에서 무늬점도가 80 이상인 것으로서, 5-에틸리덴-2-노보넨(5-ethylidene-2-norbornene, ENB)의 함량이 8 중량% 이상인 제품을 사용하는 것이 바람직하다.The EPDM rubber is preferably contained in 50 to 80% by weight of the matrix resin. When the content is less than 50% by weight, the elasticity of the product may be lowered and the sensitivity may be lowered. When the content is more than 80% by weight, the foaming and abrasion resistance of the product may be deteriorated. In addition, the EPDM rubber has a pattern viscosity of 80 or more at 125 ° C., and it is preferable to use a product having a content of 5-ethylidene-2-norbornene (ENB) of 8% by weight or more. .
본 발명에서는 웨더스트립의 표피층에 용이한 착색성을 부여하기 위해 올레핀계 열가소성 탄성체로 폴리프로필렌을 사용하며, 특히 과산화물 가교제에 의한 폴리프로필렌의 사슬 절단 현상을 최소화하기 위해 장쇄분기 함유 폴리프로필렌을 매트릭스 수지 성분으로 사용한다. 이러한 장쇄분기 함유 폴리프로필렌은 용융지수(MI)가 0.2 ~ 0.5(230℃, 2.16 kg)이며, 이와 같은 고 용융지수를 가지므로써 발포시 셀 형성에도 유리하다. 매트릭스 수지 중의 장쇄분기 함유 폴리프로필렌의 함량은 20 ~ 50 중량%가 좋은데, 함량이 20 중량% 미만이면 압출 시 EPDM 솔리드부와의 열융착성에 문제가 있을 수 있고, 50 중량%를 초과하면 경도가 상승하여 제품의 감성 문제가 있을 수 있으므로 상기 범위를 선택하는 것이 바람직하다.In the present invention, polypropylene is used as an olefinic thermoplastic elastomer in order to provide easy coloring to the skin layer of the weather strip, and in particular, a long chain branching-containing polypropylene is used as a matrix resin component to minimize chain breakage of polypropylene by a peroxide crosslinking agent. Used as The long chain branched polypropylene has a melt index (MI) of 0.2 to 0.5 (230 ° C., 2.16 kg), and has such a high melt index, which is advantageous in cell formation upon foaming. The content of the long chain branch-containing polypropylene in the matrix resin is 20 to 50% by weight, but if the content is less than 20% by weight, there may be a problem in the heat sealability with the EPDM solid part during extrusion, and when the content exceeds 50% by weight, the hardness is It is preferable to select the above range because there may be a problem of sensitivity of the product to rise.
본 발명의 웨더스트립용 조성물은 가교제로서 과산화물 가교제를 이용하며, 바람직하기로는 반감기 온도가 170℃인 2,5-디메틸-2,5-디-(터셜리 부틸 퍼옥시) 헥산(2,5-Dimethyl-2,5-di-(tert-butylperoxy)-hexane)을 사용하는 것이 좋다. 사용량은 매트릭스 수지 100 중량부에 대하여 0.6 ~ 1 중량부가 바람직한데, 가교제의 사용량이 0.6 중량부 미만이면 가교된 고무 입자가 불균질한 연속상으로 존재하여 균일한 발포성 구현에 불리하며, 1 중량부를 초과하면 과산화물 가교제에 의한 폴리프로필렌의 사슬 절단현상이 많이 발생하여 오픈셀(open cell)이 발생될 수 있다.The weather strip composition of the present invention uses a peroxide crosslinking agent as a crosslinking agent, and preferably 2,5-dimethyl-2,5-di- (tertiary butyl peroxy) hexane (2,5- having a half-life temperature of 170 ° C. Dimethyl-2,5-di- (tert-butylperoxy) -hexane) is recommended. The amount of the crosslinking agent is preferably 0.6 to 1 parts by weight based on 100 parts by weight of the matrix resin, but when the amount of the crosslinking agent is less than 0.6 parts by weight, the crosslinked rubber particles are present in a heterogeneous continuous phase, which is disadvantageous for uniform foaming, and 1 part by weight. When exceeded, a lot of chain cleavage of the polypropylene by the peroxide crosslinking agent may occur, and an open cell may be generated.
상기 가교조제는 가교밀도를 상승시키기 위해 사용하며, N,N'-m-페닐렌디말레이미드(N,N'-m-Phenylenedimaleimide), 1,2-폴리부타디엔, 또는 이들의 혼합물을 사용할 수 있다. 가교조제의 함유량은 매트릭스 수지 100 중량부에 대하여 0.15 ~ 0.5 중량부가 좋은데, 0.15 중량부 미만이면 사용에 따른 효과상의 실익이 미미하고, 0.5 중량부를 초과하면 과가교로 인해 제품 표면에 피쉬아이(fish eye)가 발생하여 제품 외관에 문제가 있을 수 있다.The crosslinking aid is used to increase the crosslinking density, and N, N'-m-phenylenedimaleimide (N, N'-m-Phenylenedimaleimide), 1,2-polybutadiene, or a mixture thereof may be used. . The content of the crosslinking aid is 0.15 to 0.5 parts by weight with respect to 100 parts by weight of the matrix resin, but if less than 0.15 parts by weight, the benefits of the use are insignificant. Eyes may occur and there may be a problem with the appearance of the product.
상기 발포제로는 아조디카르본아미드(Azodicarbonamide), p,p'-옥시비스 (벤젠-술포닐하이드라지드)(p,p'-oxibis(benzene-sulfonylhydrazide)) 또는 이들의 혼합물을 사용할 수 있으며, 입자경이 2 ~ 5 ㎛인 것을 사용하는 것이 좋다. 입자경이 2 ㎛ 미만이면 균일한 분산에 불리하여 균질한 발포 셀 형성에 문제가 있을 수 있고, 5 ㎛를 초과하면 발포 셀 크기가 커져 감성 및 외관품질에 문제가 있을 수 있다. 사용량은 매트릭스 수지 100 중량부에 대하여 0.2 ~ 0.5 중량부가 바람직한데, 사용량이 0.2 중량부 미만이면 발포 셀 형성이 미미할 수 있으며, 0.5 중량부를 초과하면 과발포로 인해 EPDM 솔리드와의 접착성 및 압출 시 다이스에 눈꼽(Bur)이 과다 발생하여 압출성에 문제가 있을 수 있다.As the blowing agent, azodicarbonamide, p, p'-oxybis (benzene-sulfonylhydrazide) (p, p'-oxibis (benzene-sulfonylhydrazide)) or a mixture thereof may be used. It is preferable to use the particle diameter of 2-5 micrometers. If the particle diameter is less than 2 μm, there may be a problem in forming a homogeneous foam cell, which is disadvantageous for uniform dispersion. If the particle size is larger than 5 μm, the foam cell size may be increased, thereby causing problems in sensitivity and appearance quality. The amount of use is preferably 0.2 to 0.5 parts by weight based on 100 parts by weight of the matrix resin. If the amount is less than 0.2 parts by weight, foaming cell formation may be insignificant. Excessive burs may occur in the die, which may cause problems in extrudability.
상기 나노크리스탈 스트럭처 엘라스토머는 균일한 발포 셀 및 내스크래치성을 향상시켜 내마모성을 향상시킬 수 있으며, 구체적으로 나노 입자 사이즈의 결정체 구조를 가진 α-올레핀계 탄성체 등을 사용할 수 있다. 사용량은 매트릭스 수지 100 중량부에 대하여 3 ~ 5 중량부가 바람직한데, 사용량이 3 중량부 미만이면 균일한 셀 사이즈 및 내마모성 향상 효과가 미미하고, 5 중량부를 초과하면 용융 강도가 저하되어 셀 붕괴(터짐) 현상이 발생하는 문제가 있을 수 있다.The nanocrystal structure elastomer may improve wear resistance by improving uniform foam cells and scratch resistance, and specifically, α-olefin-based elastomers having a crystal structure of nanoparticle size may be used. The amount of use is preferably 3 to 5 parts by weight based on 100 parts by weight of the matrix resin. If the amount is less than 3 parts by weight, the effect of improving the uniform cell size and abrasion resistance is insignificant. ) There may be a problem that occurs.
상기 산화방지제는 테트라키스(3,5-디-터셜리-부틸-4-하이드록시페닐)프로피오네이트(Tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), 테트라키스-(3-도데실티오프로피오네이트)(Tetrakis-(3-dodecylthiopropionate)), 또는 이들의 혼합물을 사용할 수 있으며, 본 발명의 웨더스트립 조성물 중의 함량은 매트릭스 수지 100 중량부에 대하여 0.2 ~ 0.6 중량부가 좋다. 사용량이 0.2 중량부 미만이면 조성물의 물성이 저하되고 완제품을 장기간 사용시 성능 저하의 문제가, 0.6 중량부를 초과하면 제품에 백화현상(Blooming)이 발생되는 문제가 있을 수 있다.The antioxidant is tetrakis (3,5-di-tert-butyl-4-hydroxyphenyl) propionate (Tetrakis (3,5-di-tert-butyl-4-hydroxyphenyl) propionate), tetrakis- (3-dodecylthiopropionate) (Tetrakis- (3-dodecylthiopropionate)), or a mixture thereof can be used, and the content in the weather strip composition of the present invention is 0.2 to 0.6 parts by weight based on 100 parts by weight of the matrix resin. good. If the amount is less than 0.2 part by weight, the physical properties of the composition may be lowered, and the problem of deterioration in performance when the finished product is used for a long time may be a problem that blooming may occur in the product.
상기 무기충전제로는 입자크기가 10 ㎛ 이하인 탄산칼슘을 사용하는 것이 바람직하며, 사용량은 매트릭스 수지 100 중량부에 대하여 10 ~ 20 중량부가 좋다. 사용량이 10 중량부 미만이면 발포제에 의해 발생되는 가스의 침투 경로가 줄어들어 발포 셀 형성에 불리하고 제품의 제조단가가 상승하는 문제가 있을 수 있으며, 20 중량부를 초과하면 제품의 비중이 증가하고, 발포 셀이 불균일 하게 되는 문제가 있을 수 있다.As the inorganic filler, it is preferable to use calcium carbonate having a particle size of 10 μm or less, and the amount of the inorganic filler is preferably 10 to 20 parts by weight based on 100 parts by weight of the matrix resin. If the amount is less than 10 parts by weight, there is a problem that the penetration path of the gas generated by the blowing agent is reduced, which is disadvantageous in forming the foamed cell and increases the manufacturing cost of the product. There may be a problem that the cells are non-uniform.
상기 폴리프로필렌계 왁스는 웨더스트립 제품의 표면 슬립성 개선 및 내마모성을 증가시키기 위해 사용한다. 사용량은 매스릭스 수지 100 중량부에 대하여 0.3 ~ 0.6 중량부가 좋으며, 사용량이 너무 적으면 내스크래치성 향상 효과가 미미하여 내마모성 증진에 효과적이지 못하고, 반대로 너무 많이 사용하면 제품 표면으로 이행되어 특성 구현에 문제가 있을 수 있다.The polypropylene wax is used to improve the surface slip property and increase the wear resistance of the weather strip product. 0.3 to 0.6 parts by weight is good for 100 parts by weight of the mass resin, and if the amount is too small, the effect of improving scratch resistance is insignificant. There can be.
상기 프로세스 오일은 웨더스트립 조성물의 가공성을 향상시키기는 역할을 수행하며, 종류를 특별히 한정하지는 않으나 바람직하기로는 고점도 파라핀계 오일을 사용하는 것이 좋다. 사용량은 매트릭스 수지 100 중량부에 대하여 60 ~ 100 중량부가 좋은데, 사용량이 60 중량부 미만이면 압출 성형시 흐름성이 불량하여 성형 불량 및 작업 불량의 원인이 될 수 있고, 100 중량부를 초과하는 경우에는 용융 강도가 저하되어 셀 붕괴 현상이 발생될 수 있다.The process oil serves to improve the processability of the weather strip composition, and is not particularly limited in kind, but preferably, a high viscosity paraffinic oil is used. 60 to 100 parts by weight is good with respect to 100 parts by weight of the matrix resin. If the amount is less than 60 parts by weight, the flowability during extrusion may be poor, which may cause molding defects and work defects. Melt strength may be lowered to cause cell collapse.
본 발명에 따른 자동차 웨더스트립용 열가소성 탄성체 조성물은 기존의 EPDM 고무 소재 보다 내마모성이 우수하여 내구성을 향상시킬 수 있으며, 착색이 용이하여 차량 탑승자에게 미적 감각을 제공할 수 있다.
The thermoplastic elastomer composition for automobile weather strip according to the present invention may be more durable than conventional EPDM rubber materials to improve durability, and may be easily colored to provide aesthetic sense to a vehicle occupant.
이하 본 발명을 실시예에 의거하여 더욱 상세히 설명하겠는바, 본 발명이 다음 실시예에 의해 한정되는 것은 아니다.Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the following Examples.
[[ 실시예Example ]]
실시예 1 ~ 3 및 비교예 1 ~ 4Examples 1 to 3 and Comparative Examples 1 to 4
하기 표 1과 같은 구성성분 및 함량으로 웨더스트립용 조성물을 제조하였다.To prepare a composition for the weather strip with the components and contents as shown in Table 1.
폴리프로필렌(중량%) Long chain branch
Polypropylene (% by weight)
폴리프로필렌(중량%)General purpose
Polypropylene (% by weight)
엘라스토머(중량부)Nano Crystal Structure
Elastomer (part by weight)
왁스(중량부)Polypropylene system
Wax (part by weight)
장쇄분기 폴리프로필렌 : [D114, Dow社]
범용 폴리프로필렌 : [BP2000, 대한유화社]
가교제 : 2,5-디메틸-2,5-디-(터셜리 부틸 퍼옥시) 헥산[Luperox 101-50D, Atochem社]
가교조제 : N,N'-m-페닐렌디말레이미드[TAC-50, DEGUSA社]
발포제 : p,p'-옥시비스(벤젠-술포닐하이드라지드)[EE188E, EIWA社]
나노크리스탈 스트럭처 엘라스토머 : 프로필렌 올레핀 코포리머[Notio, Mitsui chemical社]
산화방지제 : 테트라키스(3,5-디-터셜리-부틸-4-하이드록시페닐)프로피오네이트[S1010, 송원산업 社]
무기충전제 : 탄산칼슘[SF, 동호칼슘社]
폴리프로필렌계 왁스 : [500시리즈, 라이온켐텍社]
파라핀계 오일 : [KL1100, SJC社]EPDM Rubber: [KEP-2480, KEP Corporation]
Long Chain Polypropylene: [D114, Dow Corporation]
General purpose polypropylene: [BP2000, Korea Petrochemical Co., Ltd.]
Crosslinking agent: 2,5-dimethyl-2,5-di- (tertily butyl peroxy) hexane [Luperox 101-50D, Atochem Co.]
Crosslinking aid: N, N'-m-phenylenedimaleimide [TAC-50, DEGUSA Corporation]
Blowing agent: p, p'-oxybis (benzene-sulfonylhydrazide) [EE188E, EIWA]
Nano Crystal Structure Elastomer: Propylene Olefin Copolymer [Notio, Mitsui Chemical Co., Ltd.]
Antioxidant: Tetrakis (3,5-di-tertily-butyl-4-hydroxyphenyl) propionate [S1010, Songwon Industrial Co., Ltd.]
Inorganic filler: calcium carbonate [SF, Dongho Calcium Co., Ltd.]
Polypropylene Wax: [500 Series, Lion Chemtech]
Paraffinic oil: [KL1100, SJC company]
물성측정시험Physical property test
상기 실시예 1 ~ 3 및 비교예 1 ~ 3 에서 제조한 웨더스트립용 조성물에 대하여 다음과 같은 시험방법으로 물성을 측정하고 그 결과를 하기 표 2에 나타내었다.The physical properties of the weather strip compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were measured by the following test methods, and the results are shown in Table 2 below.
1) 내마모성1) wear resistance
1 kgf 하중에서 면범포를 마찰천으로 사용하여, 속도 50 r/min, 마찰거리 130 mm 의 조건에서 시험하였다.Using a cotton cloth as a friction cloth at a load of 1 kg f , the test was carried out under conditions of a speed of 50 r / min and a friction distance of 130 mm.
2) 발포외관2) Foam appearance
현대기아자동차 spec MS261-27에 따라 시험하였다.Tested according to Hyundai-Kia Motors spec MS261-27.
3) 제품감촉3) Product feeling
현대기아자동차 spec MS261-27에 따라 시험하였다.Tested according to Hyundai-Kia Motors spec MS261-27.
4) 셀 크기 4) cell size
SEM(전자주사현미경, 모델:S2400, , HITACHI사)을 이용하여 측정하였다.The measurement was carried out using an SEM (electron scanning microscope, model: S2400, HITACHI Co., Ltd.).
상기 표 2에서 보이는 바와 같이, EPDM 소재를 이용한 비교예 3의 경우 내마모성이 취약하여 내구성 면에서 문제가 있음을 알 수 있다. 범용 폴리프로필렌을 매트릭스 수지에 함유시킨 비교예 1 ~ 2의 경우 내마모성 평가에서는 EPDM 소재보다 우수한 결과를 보였으나, 발포외관이 불량하여 미려한 웨더스트립 제품외관을 구현하기 어려운 결과를 보였으며, 감촉 또한 EPDM 소재에 크게 못 미쳤다. 장쇄분기 함유 폴리프로필렌을 매트릭스 수지에 함유시킨 실시예 1 ~ 3의 경우 우수한 내마모성을 보였으며, 또한 폴리프로필렌의 사슬 절단 현상이 범용 폴리프로필렌을 사용한 경우보다 크게 감소하여 셀 크기 분포가 좁아지면서 발포외관과 제품감촉이 좋아지는 결과를 얻을 수 있었다.As shown in Table 2, in Comparative Example 3 using the EPDM material it can be seen that there is a problem in terms of durability due to weak wear resistance. In Comparative Examples 1 to 2 containing general-purpose polypropylene in the matrix resin, the wear resistance evaluation showed better results than the EPDM material, but it was difficult to realize a beautiful weather strip product appearance due to poor foam appearance. The material was not very good. Examples 1 to 3 in which the long chain branch-containing polypropylene was contained in the matrix resin showed excellent wear resistance, and the chain breakage of the polypropylene was greatly reduced than that of the general-purpose polypropylene, resulting in a narrow cell size distribution. And the result was a better product.
결국, 본 발명에 따른 열가소성 탄성체 조성물은 기존의 EPDM 소재의 발포외관 및 제품감촉을 가지면서도 내마모성은 크게 향상되므로, 미려한 외관과 우수한 내구성을 갖춘 자동차 웨더스트립 소재로 유용하게 적용가능함을 확인할 수 있었다.As a result, the thermoplastic elastomer composition according to the present invention has greatly improved abrasion resistance while having a foam appearance and a product feel of the existing EPDM material, and thus it was confirmed that the thermoplastic elastomer composition can be usefully applied as an automotive weather strip material having a beautiful appearance and excellent durability.
Claims (6)
가교제 0.6 ~ 1 중량부;
가교조제 0.15 ~ 0.5 중량부;
발포제 0.2 ~ 0.5 중량부;
나노크리스탈 스트럭처 엘라스토머 3 ~ 5 중량부;
산화방지제 0.2 ~ 0.6 중량부;
무기충전제 10 ~ 20 중량부;
폴리프로필렌계 왁스 0.3 ~ 0.6 중량부; 및
프로세스 오일 60 ~ 100 중량부;
를 포함하는 웨더스트립용 조성물.
100 parts by weight of matrix resin comprising 50 to 80% by weight of EPDM rubber and 20 to 50% by weight of long chain branched polypropylene
0.6-1 weight part of crosslinking agent;
0.15 to 0.5 parts by weight of crosslinking aid;
0.2 to 0.5 parts by weight of blowing agent;
3 to 5 parts by weight of the nanocrystal structure elastomer;
0.2 to 0.6 parts by weight of antioxidant;
10 to 20 parts by weight of an inorganic filler;
0.3 to 0.6 parts by weight of polypropylene wax; And
60 to 100 parts by weight of process oil;
A composition for weather strip comprising a.
The weather strip composition according to claim 1, wherein the EPDM rubber has a pattern viscosity of 80 or more at 125 ° C and a content of 5-ethylidene-2-norbornene is 8% by weight or more.
The weather strip composition of claim 1, wherein the long chain branch-containing polypropylene has a melt index (MI) of 0.2 to 0.5 (230 ° C., 2.16 kg).
The weather strip composition according to claim 1, wherein the crosslinking agent is 2,5-dimethyl-2,5-di- (tertiary butyl peroxy) hexane.
The method of claim 1, wherein the blowing agent for the weather strip, characterized in that the azodicarbonamide, p, p'- oxybis (benzene-sulfonyl hydrazide) or a mixture thereof having a particle size of 2 ~ 5 ㎛. Composition.
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| KR101438912B1 (en) * | 2012-10-16 | 2014-09-15 | 현대자동차주식회사 | Flame resisting thermoplastic elastomer composition for weather strip |
| KR20160083324A (en) * | 2014-12-30 | 2016-07-12 | (주) 화승소재 | Thermoplastic elastomer composition for glass run and method of manufacturing the same |
| KR20170075689A (en) * | 2017-06-19 | 2017-07-03 | (주) 화승소재 | Thermoplastic elastomer composition using bio-based material |
| US10266680B2 (en) | 2016-05-20 | 2019-04-23 | Hyundai Motor Company | EPDM based rubber composition for sponge section in weather strip of passenger car |
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| KR102406160B1 (en) | 2016-10-31 | 2022-06-07 | 현대자동차주식회사 | Thermoplastic Elastomer Composition for Sealing Apparatus |
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| CA2198998C (en) * | 1996-03-04 | 2001-08-21 | Keiji Okada | Foamable olefin thermoplastic elastomer compositions and foamed products thereof |
| US6433090B1 (en) * | 2001-01-26 | 2002-08-13 | Advanced Elastomer Systems, L.P. | Thermoplastic elastomers having improved set foams made therefrom |
| US7319121B2 (en) * | 2005-10-07 | 2008-01-15 | Advanced Elestomer Systems, Inc. | Microcellular foams of thermoplastic vulcanizates |
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2010
- 2010-11-23 KR KR1020100117159A patent/KR101231004B1/en active IP Right Grant
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101438912B1 (en) * | 2012-10-16 | 2014-09-15 | 현대자동차주식회사 | Flame resisting thermoplastic elastomer composition for weather strip |
| KR20160083324A (en) * | 2014-12-30 | 2016-07-12 | (주) 화승소재 | Thermoplastic elastomer composition for glass run and method of manufacturing the same |
| US10266680B2 (en) | 2016-05-20 | 2019-04-23 | Hyundai Motor Company | EPDM based rubber composition for sponge section in weather strip of passenger car |
| KR20170075689A (en) * | 2017-06-19 | 2017-07-03 | (주) 화승소재 | Thermoplastic elastomer composition using bio-based material |
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| Publication number | Publication date |
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| KR101231004B1 (en) | 2013-02-07 |
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