마스터배치로부터 제조된 자원 순환형 탄소필러기반 탄소복합소재의 열적 및 기계적 물성 개선

이종인,이승원,손태준,김수연,배진우,남병욱 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.5

Currently, a lot of heat is generated from automobiles' electronic devices as the growing automobile industry promotes automobile components' miniaturization and high performance. Subsequently, this heat deteriorates the automobile components' performance and causes their malfunction. Hence, heat-dissipating materials, releasing this generated heat outside or controlling it, have received considerable attention. Consequently, this study prepared heat-dissipating carbon composites for automobiles by adding resource-recycling carbon filler (RCF) and glass fiber (GF) with polyamide6 (PA6) and using a twin-screw extruder. In particular, these carbon composites were prepared under two processes: the 2step process prepared them from a masterbatch, whereas the 1step process prepared them at once without a masterbatch. Subsequently, these prepared carbon composites were measured for their PA6-RCF interaction, thermal and mechanical properties, and constituents' dispersion. This measurement showed that the heat-absorbing carbon composites for automobiles prepared by the 2step process exhibited superior thermal conductivity and mechanical properties compared to those prepared by the 1step process. Further, the scanning electron microscopy (SEM) studies on these composites indicated that their RCF dispersion in the PA6 matrix significantly positively influenced their improved properties. In addition, a GF of 100 phr in the said carbon composites prepared by the 2step process increased their thermal conductivity, tensile strength, and flexural modulus to 4.2 W/mK, 48 MPa, and 11800 MPa, respectively. 자동차 산업의 발달은 자동차 부품의 소형화 및 고성능화를 촉진하며 이에 따라, 전자 소자에서는 많은 열이 방출된다. 이러한 열의 방출은 자동차 부품의 기능을 저하시키고, 오작동을 초래한다. 이를 해결하기 위한 방안으로 열을 외부로 방출하거나 제어할 수 있는 방열소재에 대한 관심이 커지고 있다. 본 연구에서는, PA6에 자원 순환형 탄소필러(Resource-recycling carbon filler, RCF)와 유리섬유(Glass fiber, GF)를 첨가한 탄소복합소재를 이축압출기를 이용하여 제조하였다. 이들의 제조는 마스터배치 제조를 통한 2step 공정과 마스터배치 제조 없이 1step 공정으로 각각 제조하였다. 제조된 탄소복합소재에 대해 PA6와 RCF의 상호작용, 열적 및 기계적 물성, 분산성을 평가하였다. 결과적으로, 2step 공정으로 제조한 탄소복합소재가 1step 공정으로 제조한 탄소복합소재보다 열전도도와 기계적 물성이 우수하였는데, 주사전자현미경(Scanning electron microscope, SEM) 이미지를 통해 PA6 matrix에 대한 RCF의 분산성에 영향을 받은 것으로 확인되었다. 특히, 2step 공정으로 제조한 탄소복합소재 중에서 GF가 100 phr 첨가되었을 때, 열전도도, 인장강도, 굴곡탄성율이 각각 4.2 W/mK, 48 MPa, 11800 MPa로 증가하였다.

고열전도도 MgO를 이용한 열전도성 PV(PhotoVoltaic) 백시트의 연구

김창희(Chang-Hee Kim),장현태(Hyun-Tae Jang),박종세(Jong-Se Park),윤종국(Jong-Kuk Yoon),노은섭(Eun-Seob Noh),박지수(Ji-Soo Park),구경완(Kyung-Wan Koo) 대한전기학회 2018 전기학회논문지 Vol.67 No.3

PV module protective film plays an important role in protecting the solar cell from external environment by anti-hydrolysis polyester, UV resistance and mechanical properties. The backsheet was manufactured by using Roll-to-Roll dry laminating process. The backsheet structure is composed of 3 layers, which are PE, PET, and Fluorine polymer films. In this study, we have experimented the variation of thermal conductivities depending on MgO inputs 10% to 25% in order to confirm the dependence of the module efficiencies. High thermal conductive backsheet can increase the module output power efficiency because the heat is dissipated by spreading out the internal heat. Long-term environment weatherability tests were conducted for confirming 25 year reliability in the field such as PCT, UV, and power efficiency degradations. As the evaluation result, high thermal conductivity can be effective for increase of power efficiency of solar panel by using thermal conductive MgO masterbatch.

Evaluation of BR Blending Methods for ESBR/silica Wet Masterbatch Compounds

( Woong Kim ),( Byungkyu Ahn ),( Hyunsung Mun ),( Eunho Yu ),( Kiwon Hwang ),( Wonho Kim ) 한국고무학회 2017 엘라스토머 및 콤포지트 Vol.52 No.4

Wet masterbatch (WMB) technology is studied to develop high-content and highly disperse silica-filled com-pounds. This technology refers to the solidification of surface-modified silica with a rubber solution or latex. Until now, researchs based on styrene butadiene rubber (SBR)/silica WMB has been mainly performed. However, the blend-ing of SBR/ silica WMB and BR is not known and is currently under research and development. Therefore, in this study, the BR blending method suitable for emulsion (ESBR)/silica WMB is investigated by measuring their cure characteristics and the mechanical and dynamic viscoelastic properties. As a result, it was confirmed that the blending of ESBR/silica WMB and BR/silica dry masterbatch is most appropriate. However, it showed a disadvantage compared with the conventional mixing method, which was due to the surfactant remained and the sulfuric acid used as the coagulant.

Polypropylene Masterbatch containing additives, its manufacturing method and application products

김현훈,조완,박규환 한국공업화학회 2023 한국공업화학회 연구논문 초록집 Vol.2023 No.0

Preparation of Silica-Filled SBR Compounds with Low Rolling Resistance by Wet Masterbatch

( Jae-kyoung Yang ),( Wonhyeong Park ),( Changseok Ryu ),( Sun Jung Kim ),( Doil Kim ),( Gon Seo ) 한국고무학회 2020 엘라스토머 및 콤포지트 Vol.55 No.1

The physical properties of silica-filled SBR compounds (WSBR) prepared using silica-SBR wet masterbatches (WMB) were systematically investigated to understand the effect of the surface treatment of silica on the reinforcement per­formance of SBR. Treatment of silica with bis(triethoxysilylpropyl)tetrasulfide (TESPT) in the liquid phase, followed by mixing with an SBR solution and recovery by water stripping, easily produced silica-SBR WMB. However, insufficient sur­face treatment in terms of the amount and stability of the incorporated TESPT led to considerable silica loss and inevitable TESPT elution. Pretreatment of silica in the gas phase with TESPT and another organic material that enabled the formation of organic networks among the silica particles on the surface provided hydrophobated silica, which could be used to pro­duce silica-SBR WMB, in high yields of above 99%. The amount and type of organic material incorporated into silica greatly influenced the cure characteristics, processability, and tensile and dynamic properties of the WSBR compounds. The TESPT and organic material stably incorporated into silica increased their viscosity, while the organic networks dispersed on the silica surface were highly beneficial for reducing their rolling resistance. Excessive dosing of TESTP induced low viscosity and a high modulus. The presence of connection bonds formed by the reaction of glycidyloxy groups with amine groups on the silica surface resulted in physical entanglement of the rubber chains with the bonds in the WSBR compounds, leading to low rolling resistance without sacrificing the mechanical properties. Mixing of the hydrophobated silica with a rubber solution in the liquid phase improved the silica dispersion of WSBR compounds, as confirmed by their low Payne effect, and preservation of the low modulus enhanced the degree of entanglement.

Optimization of Cure System for the ESBR Silica WMB and BR Silica DMB Blend Compounds

( Eunho Yu ),( Woong Kim ),( Gyeongchan Ryu ),( Byungkyu Ahn ),( Hyunsung Mun ),( Kiwon Hwang ),( Donghyuk Kim ),( Wonho Kim ) 한국고무학회 2019 엘라스토머 및 콤포지트 Vol.54 No.2

Emulsion styrene-butadiene rubber silica wet masterbatch (ESBR silica WMB) technology was studied to develop highly filled and highly dispersed silica compounds, involving the preparation of a composite by co-coagulating the modified silica and the rubber latex in a liquid phase. Previous studies have shown that when manufacturing ESBR silica WMB/Butadiene silica dry masterbatch (BR silica DMB) blend compounds, preparing BR silica dry masterbatch and mixing it with ESBR silica WMB gave excellent results. However, WMB still has the problem of lower crosslink density due to residual surfactants. Therefore, in this study, tetrabenzylthiuram disulfide (TBzTD) was added instead of diphenyl guanidine (DPG) in the ESBR silica WMB/BR silica DMB blend compounds and sulfur/CBS contents were increased to evaluate their cure characteristics, crosslink densities, mechanical properties, and dynamic viscoelastic properties. TBzTD was found to be more effective in increasing the crosslink density and to produce superior properties compared to DPG. In addition, with increasing sulfur/CBS contents, mechanical properties and rolling resistance were enhanced due to high crosslink density, but the abrasion resistance was not significantly changed because of the toughness.

Masterbatch of chitosan nanowhisker for preparation of nylon 6,10 nanocomposite by melt blending process

진세빈,박제영 한국공업화학회 2022 한국공업화학회 연구논문 초록집 Vol.2022 No.-

Preparation of Silica-Filled SBR Compounds with Low Rolling Resistance by Wet Masterbatch

Yang, Jae-Kyoung,Park, Wonhyeong,Ryu, Changseok,Kim, Sun Jung,Kim, Doil,Seo, Gon The Rubber Society of Korea 2020 ELASTOMERS AND COMPOSITES Vol.55 No.1

The physical properties of silica-filled SBR compounds (WSBR) prepared using silica-SBR wet masterbatches (WMB) were systematically investigated to understand the effect of the surface treatment of silica on the reinforcement performance of SBR. Treatment of silica with bis(triethoxysilylpropyl)tetrasulfide (TESPT) in the liquid phase, followed by mixing with an SBR solution and recovery by water stripping, easily produced silica-SBR WMB. However, insufficient surface treatment in terms of the amount and stability of the incorporated TESPT led to considerable silica loss and inevitable TESPT elution. Pretreatment of silica in the gas phase with TESPT and another organic material that enabled the formation of organic networks among the silica particles on the surface provided hydrophobated silica, which could be used to produce silica-SBR WMB, in high yields of above 99%. The amount and type of organic material incorporated into silica greatly influenced the cure characteristics, processability, and tensile and dynamic properties of the WSBR compounds. The TESPT and organic material stably incorporated into silica increased their viscosity, while the organic networks dispersed on the silica surface were highly beneficial for reducing their rolling resistance. Excessive dosing of TESTP induced low viscosity and a high modulus. The presence of connection bonds formed by the reaction of glycidyloxy groups with amine groups on the silica surface resulted in physical entanglement of the rubber chains with the bonds in the WSBR compounds, leading to low rolling resistance without sacrificing the mechanical properties. Mixing of the hydrophobated silica with a rubber solution in the liquid phase improved the silica dispersion of WSBR compounds, as confirmed by their low Payne effect, and preservation of the low modulus enhanced the degree of entanglement.

Improvement of silica dispersity using acrylic dispersants in wet masterbatch system

신우승,김동현 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.1

반응기 혼합법에 의한 폴리올레핀/2D-나노시트 나노복합체 제조; 마스터배치를 이용한 폴리에틸렌 나노복합체

박준형(Jun Hyung Park),이동은(Dong Eun Lee),윤근병(Keun-Byoung Yoon) 한국고분자학회 2020 폴리머 Vol.44 No.6

옥타데실아민(octadecylamine, ODA)으로 개질한 MoS₂와 환원 그래핀옥사이드(rGO)가 분산된 폴리에틸렌 복합체를 마스터배치로 제조하였다. 마스트배치는 (n-BuCp)₂ZrCl₂/methylaluminoxane(MAO) 촉매계를 사용하여 에틸렌 중합 후 반응기 내에 개질한 2D-나노시트를 첨가하여 혼합하는 방법으로 제조하였다. 복합체의 열적, 기계적 성질 및 미세구조를 조사하였다. 폴리에틸렌 매트릭스에 2D-나노시트는 균일하게 분산되었으며, ODA 개질로 매트릭스와 2D-나노시트 계면의 접착력이 증가한 것으로 판단된다. 2D-나노시트 첨가에 따라 열적성질은 크게 변하지 않았지만, 열안정성 및 기계적 물성은 크게 증가하였다(5 wt% 첨가하였을 때 인장강도와 모듈러스는 각각 15% 및 100% 증가). 따라서 마스터배치를 사용한 나노복합체 제조는 고성능 폴리올레핀 제조에 유용할 것으로 판단된다. Polyethylene/modified 2D-nanosheets composites were fabricated via the masterbatch technique which was synthesized by reactor mixing under mild conditions using (n-BuCp)₂ZrCl₂/methylaluminoxane (MAO) catalyst. The 2D-nanosheets were modified with octadecylamine (ODA) for enhancement of dispersion and interaction with the polymer matrix. Microstructure, thermal and mechanical properties of composites were examined. The modified 2D-nanosheets were homogeneously dispersed across the composites and showed good interfacial adhesion between the modified 2D-nanosheets and polyethylene matrix. The thermal stabilities and mechanical properties of composites were significantly enhanced (e.g., up to 15% increase in tensile strength and 100% increase in Young’s modulus for composites containing 5 wt% 2D-nanosheets). Thus, the masterbatch technique was able to produce high-performance polyolefins.