• Title, Summary, Keyword: Silica Carbon Black

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Influence of Silane Coupling Agent on Properties of Filled Styrene-Butadiene Rubber Compounds

  • Park, Sung-Seen
    • Macromolecular research
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    • v.8 no.6
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    • pp.285-291
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    • 2000
  • Influence of silane coupling agent, bis-(3-(triethoxisilyl)-propyl)-tetrassulfide, on cure characteristics and bound rubber content of filled styrene-butadiene rubber (SBR) compounds and on physical properties of the vulcanizates was studied. Carbon black-filled and silica-filled compounds were compared. Content of the bound rubber increased with increased content of the silane coupling agent and this trend was shown more clearly in the silica-filled compounds. Optimum cure time of the carbon black-filled compound increased with increase of the silane content, while that of the silica-filled one decreased. Cure rate of the carbon black-filled compound became slower as the silane content increased while that of the silica-filled one became faster. By increasing the silane content, the minimum torque decreased and the delta torque increased. Physical properties of the silica-filled vulcanizate were found to be improved by adding the silane coupling agent. However, for the carbon black-filled vulcanizates, the tensile strength and tear resistance decreased with increase of the silane content. The differences between the carbon black-filled and silica-filled compounds were explained by difference in the reactivities of the fillers with the silane.

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Synthesis of New Black Pigment; Carbon Black Pigment Capsulated into the Meso-pore of Silica as Black Pigment in Cosmetic (새로운 Black Color의 합성;화장품에서 블랙 색소로서 Meso-pore Silca에 캡슐레이션된 Carbon-black Silica)

  • Hye-in, Jang;Kyung-chul, Lee;Hee-chang , Ryoo
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.30 no.2
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    • pp.189-195
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    • 2004
  • Carbon black have not been used as pigment material in cosmetic because of very low density and dispersity, but carbon black have applicable character as black pigment because of non-toxic, stable physico-chemical property, and black colority. In this study, mesoporous silica samples were synthesized by sol-gel reaction using surfactants-template method; TEOS (tetraethoxysilane) - a) PEO/lecithin, b) PEO/polyethylene glycol, c) lecithin/polyethylene glycol in ethanol/water solution. Synthesized organic-inorganic hybrid - silica were heat-treated in N2 condition at 500$^{\circ}C$. Mesoporous silica with black carbon in pore have the effective density and show the good dispersity in both hydrophilic and hydrophobic solvent. Properties of the samples were measured; specific surface area (750㎡/g) and pore size (4-6nm) using BET, pore structure (cylindrical type) using XRD, morphology (spherical powder with 0.1-0.5$\mu\textrm{m}$ partical size) of the samples using SEM. Carbon-silica black color applied to mascara, it shows a dark black colority and good dispersity as compared with the general black color titania pigment. Moreover, it is possible to control the density of black color pigment because it is possible to control pore volume and particle size of mesoporous silica properly. It show the good volume effects in mascara. That is why possible to apply all kinds of cosmetic products.

The Study on the Dependence of Cure Condition for Reinforcing Filler (보강성충전제의 가황조건 의존성에 관한 연구)

  • Lee, Seag
    • Elastomers and Composites
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    • v.33 no.2
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    • pp.75-82
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    • 1998
  • The purpose of this experimental study was to investigate the effects of vulcanization condition on the properties of reinforced rubbers. Rubber reinforcing ability of carbon black was more efficient than other fillers, but tensile properties were not affected by vulcanization condition while vulcanization condition affected the physical properties of rubber compounds with silica and silane treated slica. It was found that silica and silane treated silica filled rubber compounds showed good dynamic properties, rebound, heat build-up, 0 and $60^{\circ}C$ tan $\delta$ compared with carbon black filled rubber compounds. Carbon black filled rubber compounds were higher than silica and silane treated silica filled rubber compounds in total crosslinking density by vulcanization condition. By analysis of crosslinking type, polysulfide crosslinking was the highest in the carbon black filled rubber compounds with decreasing the ratio of sulfur to accelerator, monosulfide crosslinking was the highest in the silane treated silica filled compounds with in-creasing the ratio of sulfur to accelerator.

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A Study on the Vulcanization Characteristics of SBR/BR Blends Containing Reinforcing Fillers (보강성 충전제가 첨가된 SBR/BR 블렌드의 가황특성에 관한 연구)

  • Lee, Seag
    • Elastomers and Composites
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    • v.33 no.4
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    • pp.274-280
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    • 1998
  • Order of reaction, rate constant, activation energy for vulcanization reaction, crosslinking density, and elastic constant of the network produced by sulfur curing were investigated on the SBR/BR blends containing silica and carbon black under same cure system. The reaction order was shown to be first order regardless of filler types. The carbon black filled rubber compounds showed higher rate constant compared to silica filled compounds. But activation energy appeared to be same regardless of filler type and rubber blend ratio. The crosslinking density and elastic constant is higher in the carbon black filled compound compared to silica filled compounds because of strong interaction between rubber and carbon black. On the other hand, crosslinking density and elastic constant were decreased with increasing the butadine rubber content in rubber blends. From the comparison of combined sulfur content in the vulcanized rubber, sulfur content in the silica filled compound become constant 20min later after reaction initiates but sulfur content in the carbon black filled compound become constant 10min later after reaction starts. The silica compound has a longer induction time ($t_2$) and optimum cure time($t_{90}$) compared to those of the carbon black filled compound.

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Influence of Mixing Procedure on Properties of Rubber Compounds Filled with Both Silica and Carbon Black (배합 공정이 실리카와 카본블랙으로 보강된 고무 배합물의 특성에 미치는 영향)

  • Joo, Chang-Whan;Kim, Dong-Chul;Choi, Sung-Seen
    • Elastomers and Composites
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    • v.37 no.1
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    • pp.14-20
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    • 2002
  • Silica-filled rubber compound needs longer mixing time compared to carbon black-filled one since it has poor dispersion or the filler. Influence of the mixing procedure on the properties of natural rubber compound filled with both silica and carbon black was studied. The discharge temperature of the master batch (MB) mixing was $150^{\circ}C$. The mixing time was longer when silica and carbon black were loaded separately than when loaded simultaneously. The mixing time was longer when silica was loaded first than when carbon black is loaded first. The compounds prepared by one MB step (conventional mixing) were compared with the compounds prepared by two MB steps (two-step mixing). Scorch times of the two-step mixing compounds were longer than those by the conventional mixing ones. Bound rubber contents of the formers were lower than those of the tatters. The two-step mixing vulcanizates had longer elongation at break, higher tensile strength, and better fatigue life.

Crack and Cutting Resistance Properties of Natural Rubber(NR) Compounds with Silica/Carbon Black Dual Phase Filler (Silica/Carbon Black이 충전된 NR 가황물의 내Crack 및 내Cutting 특성)

  • Son, Woo-Jung;Cho, Ur-Ryung;Kim, Won-Ho
    • Elastomers and Composites
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    • v.37 no.2
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    • pp.86-98
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    • 2002
  • The application of silica/carbon black dual phase fillers to natural rubber(NR) compound was investigated. When the amounts of filler content were restricted to 60phr, the optimum ratio of dual phase fillers were 25phr/35phr of silica/carbon black. It was found that these new fillers give better overall performance in comparison with carbon black in tear strength, crack resistance, and cutting resistance. Also the thermal degradation resistance of NR vulcanizates which were filled with dual phase fillers was better than that of the carbon black. Dual phase fillers filled NR vulcanizates showed better viscoelastic properties, like tan${\delta}$, for the wet skid resistance and rolling resistance of motor vehicle tires.

Effects of Mixing Mode on the Fracture Properties of Silica and Carbon Black Filled NR Vulcanizates (실리카 및 카본블랙이 충전된 천연고무 가황물에서 배합방법이 파열특성에 미치는 영향)

  • 박성수;박병호;송기찬;김수경
    • Polymer Korea
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    • v.24 no.2
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    • pp.220-227
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    • 2000
  • Silica and carbon black filled natural rubber (NR) vulcanizates were prepared with different mixing modes and amounts of fillers. Curing characteristics, morphology. and tear properties of the NR vulcanizates were investigated. The NR vulcanizates filled with silica and carbon black sequentially showed longer induction time ($t_2$), cure index ($t_{90}$ ), and lower maximum torque ($T_{max}$ ) than the NR vulcanizates filled with them simultaneously, during curing process. The former showed superior dispersion of fillers and tear properties to the latter. The NR vulcanizates containing 30 phr of silica showed excellent properties in the experimental range.

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Influence of Filler Composition Ratio on Properties of Both Silica and Carbon Black-Filled Styrene-Butadiene Rubber Compounds (실리카와 카본블랙으로 보강된 SBR 고무 배합물의 특성에 보강제 조성비가 미치는 영향)

  • Choi, Sung-Seen
    • Elastomers and Composites
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    • v.36 no.1
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    • pp.37-43
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    • 2001
  • Influence of the filler composition ratio on cure characteristics and bound rubber content of the compounds and on physical properties of the vulcanizates were studied using both silica and carbon black-filled styrene-butadiene rubber (SBR) compounds with the total filler content of 80.0 phr. The bound rubber content increased slightly with increase of the silica content ratio. The viscosity also increased with increasing the silica content ratio, especially increased steeply after the silica content of 60.0 phr. The cure times obtained with a rheometer, t2, t40, and t90, are increased by increasing the silica content ratio and the cure rate decreased. The delta torque increased with the increased silica content ratio. Variation or the modulus with the silica content ratio showed a decreased trend though the delta torque increased. The tan ${\delta}$ at $60^{\circ}C$ decreased with increased of the silica content ratio.

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Influence of Filler Systems and Microstructures of SBR on Stress Softening Effect of SBR Vulcanizates (SBR의 미세 구조와 보강 시스템이 SBR 가황물의 응력 풀림 효과에 미치는 영향)

  • Choi, Sung-Seen;Han, Dong-Hun;Woo, Chang-Su
    • Elastomers and Composites
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    • v.41 no.3
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    • pp.164-171
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    • 2006
  • Stress softening behaviors of SBR vulcanizates reinforced with silica or carbon black were studied. Two types of SBR with different 1,2-unit contents of 18 and 60 wt% were used and three filler systems of carbon black and silica with/without silane coupling agent were employed. Stress softening behaviors of the SBR vulcanizates were varied with the SBR types as well as the filler systems. The silica-filled rubber specimens had higher residual strains than the carbon black-filled ones. The residual strains of silica-filled vulcanizates were remarkably reduced by adding a silane coupling agent. The maximum loads at 50% maximum stretch of the carbon black-filled vulcanizates were lower than those of the silica-filled ones. On the contrary, the maximum loads at 200% maximum stretch of the carbon black-filled vulcanizates were higher than those of the silica-filled ones. The maximum loads of the specimens with the 1,2-unit content of 60 wt% are higher than those with the 1,2-unit content of 18 wt% irrespective of the filler systems.

Effect of Carbon Amino Silica Black Contained Superplasticizer on the Engineering Properties and Chromaticity of Black Color Concrete (카본 아미노 실리카 블랙 기반 고성능 감수제가 블랙 컬러 콘크리트의 공학적 특성 및 발색도에 미치는 영향)

  • Han, Min-Cheol;Hong, Seok-Min
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.1 no.3
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    • pp.181-188
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    • 2013
  • This paper is to investigate experimentally an effect of carbon amino silica black-superplasticizer(CASB-SP)on the engineering properties and chromaticity of black color concrete with 0.45 of W/C(water to cement). CASB-SP and carbon black were applied for pigment of the concrete. To prevent efflorescence of concrete, four different water repellent agents were also applied. As results, it was found that use of CASB-SP increased the slump and air contents. Furthermore, the use of CASB-SP increased the compressive strength. As CASB-SP dosages increased, chromaticity was well developed. For the effect of water repellent agent, the use of epoxy type was effective for protection from efflorescence. Based on test results, it was evaluated that 0.5% of CASB-SP effectively improve the concrete quality as well as enhance the chromaticity with proper dosage.