저온 내충격성 향상을 위한 PA66/EPDM/PP 복합체 제조와 기계적 특성 연구

이태식 ( Tae Sik Lee ),윤창록 ( Chang Rok Yoon ),방대석 ( Dae Suk Bang ),안대영 ( Dae Young Ahn ),계형산 ( Hyoung San Kye ),신경철 ( Kyung Chul Shin ) 한국고무학회 2009 엘라스토머 및 콤포지트 Vol.44 No.2

모듈라 치합형 동방향 이축 스크류식 압출기(modular intermeshing co-rotating twin screw extruder)를 이용하여 저온 내 충격성 향상을 위해 PA66/EPDM/PP-g-MA 및 PA66/EPDM-g-MA/PP-g-MA 복합체를 각 성분 wt%를 변화하여 제조하였다. 그 결과 이들 복합체 중에서 PA66/EPDM-g-MA/PP-g-MA의 wt%가 90/8/2인 복합체가 다른 복합체들 보다 열적, 기계적으로 우수한 결과를 나타내었다. 그리고 열중량분석기(Thermogravimetric Analysis), 시차주사열량계(Differential Scanning Calorimeter)를 이용하여 열적 특성, 주사전자현미경(Scanning Electron Microcsopy)을 이용하여 형태학적 변화를 분석하였다. 본연구를 통하여 기존 PA66/EPDM composite의 단점인 낮은 계면력과 저온 내충격성을 향상 시켰으며, 최적의 mixing효과를 위한 screw configuration에 따른 압출 공정 확립과 PA66/EPDM composite 생산 공정 국산화 및 원가절감의 효과를 가져왔다. PA66/EPDM/PP-g-MA and PA66/EPDM-g-MA/PP-g-MA composites were manufactured by a modular intermeshing twin screw extruder for enhanced low temperature impact resistance with different content of PP-g-MA. The results showed that composite containing 90 wt% of PA66, 8 wt% of EPDM-g-MA, and 2 wt% of PP-g-MA has a optimum value in the thermal and mechanical properties. The characteristics of the composites were analyzed by TGA, DSC, and SEM. From above results, we established that the low interfacial strength and the impact resistance at low temperature shown in a pre-existing PP/EPDM composite were enhanced by grafting with compatibilizer such as maleic anhydride. These results show the possibility of local manufacturing process and cost down with optimum screw configuration for best mixing quality in the twin screw extruder.

EPDM/PP계 열가소성 가교체의 유변특성 및 물성에 미치는 조성의 영향

최대환 ( Dae Whan Choi ),임성담 ( Sung Dam Lim ),이종문 ( John M. Rhee ),김완두 ( Wan Doo Kim ),나창운 ( Chang Woon Nah ) 한국공업화학회 2003 공업화학 Vol.14 No.4

ethylene-propylene diene ter-monomer (EPDM)/polypropylene (PP)계 thermoplastic olefin (TPO)와 thermoplastic vulcanizate (TPV)의 유변특성 및 기계적 물성에 미치는 EPDM/PP 조성비, 오일함량, 카본블랙 함량의 영향을 조사하였다. TPO 및 TPV는 고분자 수지의 전형적인 power law 형태의 pseudoplastic 흐름거동을 따르는 것을 확인하였다. EPDM의 함량이 높을수록 높은 점도를 나타내었다. 오일함량 증가에 따라 선형적인 점도하락을 보인반면, 카본블랙은 그다지 큰 영향을 보이지 않았다. TPO의 경우 EPDM 합량 증가에 따라 인장강도의 선형적인 감소를 나타낸 반면, TPV의 경우 EPDM 함량이 65 wt%까지는 거의 유사한 결과를 보인 후 그 이상에서는 급격한 감소를 나타내었다. TPO 및 TPV의 모듈러스는 Coran-Patel 모델에 잘 따르는 것으로 확인되었다. TPO의 경우 EPDM의 함량이 70 wt% 이상에서 상변환이 일어나지만, TPV의 경우는 동일조성에서 상변환이 관찰되지 않았다. Effects of ethylene-propylene diene ter-monomer (EPDM)/polypropylene (PP) composition, oil and carbon black contents on the rheological and mechanical properties of thermoplastic olefin (TPO) and thermoplastic vulcanizate (TPV) based on EPDHPP were investigated. It was found that the flow behavior of TPO and TPV followed the power-law behavior showing a typical pseudoplastic characteristics. Higher shear viscosity was observed with increased EPDM content. The shear viscosity decreased with increasing oil content, but no considerable effect was found by the addition of carbon black. Tensile strength of TPO decreased linearly with increasing EPDM content, while that of TPV maintained until 65 wt% and then rapidly decreased with further increase of EPDM content. Tensile moduli of TPO and TPV could be well predicted by the Coran-Patel model. When the content of EPDM was increased to about 70wt%, phase inversion was observed for TPO, but it was not found for TPV.

A Comparative Study of Morphology and Structure related Properties of Saturated Olefinic Thermoplastic Elastomer Blends of EPDM/PP/Oil and SEBS/PP/Oil

( P. Sengupta ),( J. W. M. Noordermeer ),( W. G. F. Sengers ),( A. D. Gotsis ) 한국고무학회 2003 엘라스토머 및 콤포지트 Vol.38 No.1

N/A This work presents a comparative study of the morphology and structure related properties of thermoplastic elastomer blends based on SEBS/PP/Oil and dynamically vulcanized EPDM/PP/Oil. A combination of ruthenium oxide staining and low voltage scanning electron microscopy (LVSEM) was found to be suitable for the study of morphology of these highly oil extended blends. A close analogy was found in the mechanical, thermal and rheological properties of the two systems made in an internal Brabender mixer and co-rotating twin screw extruder. The morphology of the blends, as made by the two techniques, was found to be significantly different. In the case of TPVs, the blends made in the extruder had smaller EPDM domains and better tensile properties. In the case of SEBS, the blends made in the Brabender had more co-continuous phases and showed better tensile properties. Crystallization behavior of the isotactic polypropylene in the blends was found to be influenced by the type of rubber. Blends of SEBS/PP crystallized at a lower temperature than the TPVs. These differences were probably caused by differences in the nucleating ability of the two rubbers.

표면 처리된 중공 형태 유리 마이크론 입자가 포함된 폴리프로필렌/에틸렌-프로필렌-디엔 복합체의 음향 호스 응용

조민현(Min Hyun Cho),조용준(Yong Jun Cho),김창근(Chang Keun Kim) 한국고분자학회 2015 폴리머 Vol.39 No.4

해수에서 사용되는 음향 탐지 시스템의 장기간 운용을 위해서는 음향 호스 소재로 우수한 기계적 물성과 충진 오일과 해수에 의한 낮은 팽윤도를 갖는 소재가 요구된다. 이층 구조의 음향호스의 외피 소재로 폴리프로필렌/에틸렌-프로필렌-디엔(PP/EPDM) 블렌드에 중공 형태 유리 마이크론 입자(HGM)가 포함된 복합재료를 실험하였다. 보다 향상된 물성의 복합재료를 개발하기 위해 아민 말단기를 갖는 HGM(HGM-NH2), 폴리프로필렌-말레익안하이드라이드 상용화제가 사용되었다. HGM을 포함한 복합재료는 HGM의 표면 처리에 상관없이 PP/EPDM보다 향상된 인장강도와 해수에 대해 낮은 팽윤도를 나타내었다. 같은 함량의 HGM을 포함한 경우, HGM-NH2를 포함한 복합재료가 표면처리를 하지 않은 HGM을 포함한 복합재료에 비해 보다 향상된 인장강도와 낮은 팽윤도를 나타내었다. 장시간 해수 함침 후 인장강도를 측정한 결과 복합재료의 물성 변화가 거의 없이 최초의 인장강도를 유지하였다. To be used as an encapsulant in undersea sonar devices, a material exhibiting excellent mechanical strength and a lower swelling ratio for seawater and oil is required to prolong its application. Polypropylene(PP)/ethylene-propylene-diene (EPDM) composites containing hollow glass microsphere (HGM) particles were examined to be used as an outer layer of a bilayer sonar encapsulant. To produce composites having enhanced properties, HGM particles grafted with 3-aminopropyltriethoxysilane having amine end groups (HGM-NH2) and polypropylene-maleic anhydride as a compatibilizer were used. The composite containing HGM particles exhibited better tensile strength and lower swelling ratios in the seawater than PP/EPDM blends regardless of the surface treatment of the HGM particles. At a fixed HGM content in the composite, the composite containing HGM-NH2 exhibited better tensile strength and lower swelling ratio than the composite containing untreated HGM. The tensile strengths of the composites examined here were not changed after impregnated with seawater.

Effect of Different Nanofillers on Non-Isothermal Crystallization Kinetics and Electric Conductivity of Dynamically-Vulcanized PP-EPDM Blends

Bin Yang,Lei Hu,Ru Xia,Fang Chen,Shu-Chun Zhao,Yan-Li Deng,Ming Cao,Jiasheng Qian,Peng Chen 한국고분자학회 2016 Macromolecular Research Vol.24 No.1

In this study, nanofillers composed of hydroxylated carbon nanotubes (h-CNT), carbon nanotubes (CNT) and graphene (GR) were separately added into the dynamically-vulcanized polypropylene (PP)/ethylene-propylenediene monomer (EPDM) blend. Differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and electrical resistivity measurements were employed to study the effect of nanofillers on the melt behavior, non-isothermal crystallization behavior and electrical conductivity of the prepared composites. WAXD results showed that h-CNT had a better induction effect of β-PP in the nanocomposites. The sequence of the activity in inducing the formation of β-PP was h-CNT>GR>CNT. However, the total crystallinity of the nanocomposites nearly remained constant. Non-isothermal crystallization kinetic analysis indicated that the presence of nanofillers improved the crystallization rate of the nanocomposites. The consequence of nucleation activity was as follows: CNT>GR>h-CNT. Although EPDM hindered the macromolecular motion of PP, interestingly it could increase the crystallization rate to an extent. Besides, the influence of nanofillers on enhancing the conductive property of the nanocomposites can be ranked as follow: CNT>GR>h-CNT.

A Novel Kinetic Analysis of Crystallization of Polypropylene (PP) in Dynamically-vulcanized PP/Ethylene-propylene-diene Rubber (EPDM) Blends Using an In-situ Measurement Technique

Lei Hu,Bin Yang,Yan-Li Deng,Fei-Xue Lu,Ru Xia,Zheng-Zhi Zheng,Ji-Bin Miao,Jia-Sheng Qian,Chuan-Ru Zhang,Peng Chen,Yu-Chuan Zhang 한국고분자학회 2017 폴리머 Vol.41 No.4

The effects of cooling medium temperatures and plastic/rubber ratios on solidification and crystallization kinetics of dynamically-vulcanized polypropylene/ethylene-propylene-diene rubber (PP/EPDM) blends were investigated with the aid of an in-situ measurement technique. The cooling medium temperature heavily influenced the solidification kinetics primarily due to a combination of latent heat liberated from the molten polymer and the heat transferred away via the metallic wall during the cooling period. Interestingly, the parameter C in three-parameter model was not only affected by the material properties, but also by the cooling condition, different from the previous literature. The crystallization kinetics analysis indicated that the effect of EPDM in the blends consisted of both nucleation-promoting effect (low EPDM loading) and steric effect (higher EPDM loading). The present kinetic analysis may be helpful to further studies on improving the product performances for industrial applications.

Study on Crystallization Kinetics of Dynamically-Vulcanized PP/EPDM Blends

Bin Yang,Yan-Li Deng,Xia Ru,Ji-Bin Miao,Ming Cao,Jia-Sheng Qian,Li-Fen Su,Peng Chen,Jing-Wang Liu,La-Xia Wu,Tao Pang 한국고분자학회 2016 폴리머 Vol.40 No.4

Two types of β nucleating agents (β-NAs), aryl dicarboxylic acid amide (TMB-5) and diphenyl phthalate diamine (NT-C), were adopted to modify the polypropylene (PP)/ethylene propylene diene monomer (EPDM) blends, which were prepared by dynamic-vulcanization technology. Wide angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) were used to study the crystallization kinetics of PP. Our results showed that the addition of β-NAs can considerably increase the crystallization temperature, and significantly decrease the spherulite size of β-PP (L300). The Jeziorny analysis showed there were ~82% and ~89% of relative crystallinity generated from the primary crystallization in the composites containing TMB-5 and NT-C, respectively. The crystallization half time (t0.5) showed that NT-C improved the overall crystallization rate more effectively than TMB-5. In addition, the peaks of the relative crystallization rate curves were shifted towards higher temperature by 14 and 9℃ with the addition of TMB-5 and NT-C, respectively.

초미립 clay를 이용한 자동차부품용 TPE 소재의 난연특성에 관한 연구

윤여성(Yeo-Seong Yoon),오미혜(Mee-Hye OH),강민경(Min-Kyung Kang),이춘범(Chun-Beom Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

In this study, the properties of TPE (Thermo Plastic Elastomer) nanocomposite with clay have been compared with clay content in terms of thermal, flame retardant and mechanical properties. 2M2HT (d??₁= 31.5 A) and MT2EtOH (d??₁= 18.5Å) were used additive. We compared the properties according to the content of the clay in PP/EPDM matrix. FT-IR, XRD showed that the 2M2HT was dispersed homogeneously into the PP/EPDM matrix as nano-scale. In general thermal and mechanical properties of nanocomposite are not influenced by added clay. However. in case of the property of flame retardants had showed superior as d-spacing value in clay is higher.

Elastomers and Composites : Study on the Functionalization of Waste EPDM and PP Blend

( Kyungho Chung ),( Jinhee Kim ) 한국고무학회 2015 엘라스토머 및 콤포지트 Vol.50 No.4

Recycling of ethylene-propylene-diene terpolymer (EPDM) scrap was tried by blending with polypropylene (PP). EPDM scrap powder was prepared by shear pulverization process at high temperature, which may lead to selective chain scission induced by difference in the critical elastic coefficient. On the other hand, EPDM scrap powder was prepared by adding a selected reclaiming agent during shear pulverization process at high temperature. Terpene as a bonding agent was then introduced to improve adhesion property. PP, used as a matrix for manufacturing thermoplastic elastomer, was modified by the incorporation of dicumyl peroxide and maleic anhydride. The functionalized EPDM and modified PP were blended and cured dynamically at 190℃. The blend materials prepared in this study showed the comparable results to those of conventional TPE in terms of tensile and flow properties. Also, the odor component of recycled EPDM was analyzed using GC-MS.

Introduction to filter module parts

김영선,심상은 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

Filter module systems can be used for waste water treatment, manufacturing of mineral pigments, recovery of fibers, dewatering of ceramic bulk, filtration of metallic salt solutions, coal and ore from flotation processes, separation of oil and so on. The effectiveness of a filter apparatus depends on the construction and the material of the filter medium support tray. Some common materials are wood, aluminium, cast iron, ductile iron, stainless steel and material compounds out of steel and rubber. These elements are showing a lot of disadvantages as for example low chemical and corrosion resistance, high weight, unfavourable drainage, considerable abrasion, limited working life, fluid absorbency and bad sealing. Polypropylene turned out to be the best material due to it's most favourable price-power-performance and its interesting combination of excellent properties.