SBR 컴파운드의 가황 및 기계적 성질에 미치는 카본블랙 표면의 화학적 개질의 영향 Effects of Chemical Surface Modification of Carbon Black on Vulcanization and Mechanical Properties of Styrene-Butadiene Rubber Compound원문보기
카본블랙의 화학적 표면개질에 따른 영향을 조사하기 위해 3종류 화학약품(KOH, $H_3PO_4$, 벤젠)을 이용하여 카본블랙 표면을 처리하였으며, 이를 함유한 스티렌-부타디엔 고무(SBR)의 가황특성과 기계적 특성을 조사하였다. 산(HCB)이나 염기(KCB)로 표면 처리할 경우 표면 자유에너지의 증가가 관찰된 반면, 벤젠(BCB)의 경우 미세한 증가만이 관찰되었다. London 비극성 성분은 BCB가 가장 높았다. 각 표면처리 카본블랙을 함유한 SBR 컴파운드의 가황반응의 빠르기는 KCB-SBR>BCB-SBR>VCB- SBR(무처리)>HCB-SBR의 순으로 나타났다. 일반적으로 가교도를 나타내는 가황곡선상의 최대토오크와 최소토오크의 차이는 VCB-SBR, KCB-SBR, HCB-SBR에 비해 BCB-SBR이 높은 값을 나타내었다. BCB-SBR과 KCB-SBR의 경우 인장특성과 동적기계적 특성이 증진되었다. 표면자유에너지 중 London 비극성 요소와 기계적 특성간에는 비례관계가 있음이 확인되었다.
카본블랙의 화학적 표면개질에 따른 영향을 조사하기 위해 3종류 화학약품(KOH, $H_3PO_4$, 벤젠)을 이용하여 카본블랙 표면을 처리하였으며, 이를 함유한 스티렌-부타디엔 고무(SBR)의 가황특성과 기계적 특성을 조사하였다. 산(HCB)이나 염기(KCB)로 표면 처리할 경우 표면 자유에너지의 증가가 관찰된 반면, 벤젠(BCB)의 경우 미세한 증가만이 관찰되었다. London 비극성 성분은 BCB가 가장 높았다. 각 표면처리 카본블랙을 함유한 SBR 컴파운드의 가황반응의 빠르기는 KCB-SBR>BCB-SBR>VCB- SBR(무처리)>HCB-SBR의 순으로 나타났다. 일반적으로 가교도를 나타내는 가황곡선상의 최대토오크와 최소토오크의 차이는 VCB-SBR, KCB-SBR, HCB-SBR에 비해 BCB-SBR이 높은 값을 나타내었다. BCB-SBR과 KCB-SBR의 경우 인장특성과 동적기계적 특성이 증진되었다. 표면자유에너지 중 London 비극성 요소와 기계적 특성간에는 비례관계가 있음이 확인되었다.
To see the effect of chemical surface modification, the carbon black surfaces were treated with three types of chemicals (KOH, $H_3PO_4$, and benzene). Vulcanization and mechanical properties of a styrene-butadiene rubber (SBR) were investigated depending on the chemical treatments. The s...
To see the effect of chemical surface modification, the carbon black surfaces were treated with three types of chemicals (KOH, $H_3PO_4$, and benzene). Vulcanization and mechanical properties of a styrene-butadiene rubber (SBR) were investigated depending on the chemical treatments. The surface free energy increased considerably with the treatments by both the acid (HCB) and base (KCB), but only a slight increase was observed for benzene treatment(BCB). The BCB showed the highest level of the London dispersive component. The vulcanization reaction was found to be faster in the order of KCB-SBR> BCB-SBR> VCB-SBR(virgin) > HCB-SBR. The difference in minimum and maximum torque of rheocurve, representing the degree of crosslinking, was found to be higher for the BCB-SBR compared to those of VCB-SBR, KCB-SBR, and HCB-SBR. The BCB-SBR and KCB-SBR showed the improved tensile and dynamic mechanical properties. A linear relationship was found to exist between the London dispersive component of surface free energy and mechanical properties.
To see the effect of chemical surface modification, the carbon black surfaces were treated with three types of chemicals (KOH, $H_3PO_4$, and benzene). Vulcanization and mechanical properties of a styrene-butadiene rubber (SBR) were investigated depending on the chemical treatments. The surface free energy increased considerably with the treatments by both the acid (HCB) and base (KCB), but only a slight increase was observed for benzene treatment(BCB). The BCB showed the highest level of the London dispersive component. The vulcanization reaction was found to be faster in the order of KCB-SBR> BCB-SBR> VCB-SBR(virgin) > HCB-SBR. The difference in minimum and maximum torque of rheocurve, representing the degree of crosslinking, was found to be higher for the BCB-SBR compared to those of VCB-SBR, KCB-SBR, and HCB-SBR. The BCB-SBR and KCB-SBR showed the improved tensile and dynamic mechanical properties. A linear relationship was found to exist between the London dispersive component of surface free energy and mechanical properties.
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제안 방법
In this study, as an extension of former works10~12 the chemical modification effect was extended to a different rubber, styrenebutadiene rubber (SBR), especially in terms of the cure characteristics, and tensile and dynamic mechanical properties. An attempt was made to correlate the surface free energy information with the mechanical properties.
The surface free energy of a solid can be obtained by measuring the contact angle formed between the solid and liquid of known surfece free energy characteristics. In this work, the surface free energy of carbon black was determined at 20+1℃ using a sessile drop method13 (Rame-Hart Goniometer), as shown in Fig. 1 Four different wetting liquids: distilled water, diiodomethane, ethylene glycol and glycerol were selected. The basic characteristics of surface free energy of the liquids are given in Table 2.
This work reported the effects of chemical surface treatments of carbon blacks on the cure characteristics, tensile properties, and dynamic mechanical properties of a styrenebutadiene rubber. The surface free energy was considerably enhanced when the carbon blacks were treated with acid (HCB) and base chemicals (KCB), mainly due to the increase of the specific component, while only a slight increase was observed for benzene-treated carbon black (BCB).
17 Since the surface of carbon black is chemically modified in this work, the interfacial interaction, that is one of the key parameters to mechanical properties, is expected to be changed to a certain degree depending on the type of treatments. To understand the mechanical reinforcement behavior of the surface modified carbon blacks, tensile properties including hardness and dynamic mechanical properties were investigated for three rubber compounds: VCB-SBR, KCB-SBR, and BCB-SBR. In the case of HCB-SBR, it was impossible to compare the properties due to the lack of vulcanization as shown in Fig.
대상 데이터
A styrene-butadiene rubber (SBR-1500, bound styrene: 23.5%, cis-1, 4: 17%, trans-1, 4'- 68%, 1, 2-vinyl: 15%, Kumho Petrochemical Co., Korea) was selected as a rubber in this study. A carbon black of N-220 type (Lucky Carbon Black Co.
이론/모형
5 arc. Hardness was measured using a springtype hardness tester (Shore Durometer A-2 type) according to the procedure of ASTM D2240. For measuring tensile properties, the dumbbell-shaped specimens were cut from the vulcanized rubber sheets.
성능/효과
The cure behavior was strongly affected by the type of chemical surface treatments, ie.., the vulcanization reaction of SBR compounds containing various surface-modified carbon blacks was found to be faster in the order of KCBSBR BCB-SBR VCB-SBR HCB-SBR. The difference in minimum and maximum torque, representing the degree of crosslinking was found to be higher for BCB-SBR compared to those of VCB-SBR, KCB-SBR, and HCB-SBR.
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