• Title, Summary, Keyword: NBR

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Thermal Aging Behavior of H-NBR/NBR Blend (H-NBR/NBR 블렌드의 열노화거동)

  • Choi, Won-Seok;Kim, Gun-Wan;Do, Je-Sung;Yoo, Myung-Ho;Ryu, Sung-Hun
    • Elastomers and Composites
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    • v.46 no.2
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    • pp.132-137
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    • 2011
  • In the present investigation, thermal aging behavior of H-NBR/NBR blend with various H-NBR content was investigated. Mixture of dicumyl peroxide and sulfur were used as a curing agent. The influence of the thermal aging of the H-NBR/NBR blends on the solid state properties such as tensile strength, elongation at break, hardness and abrasion resistance was investigated. Tensile strength was increased with increasing H-NBR content, while abrasion resistance was decreased. Both elongation at break and hardness were not affected by the addition of H-NBR. The properties such as hardness, tensile strength and elongation at break of the aged samples were lower than unaged samples. However, the rate of deterioration of those properties was decreased by increasing the H-NBR content, which indicated that improved thermal aging behavior was obtained by the addition of H-NBR. Abrasion loss was increased with increasing aging time, but it became less by the addition of H-NBR addition.

Preparation and Properties of NBR-Clay Hybrid Membranes (NBR-Clay 하이브리드 막의 제조 및 물성)

  • 남상용;김영진
    • Membrane Journal
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    • v.14 no.2
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    • pp.132-141
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    • 2004
  • NBR-Clay hybrid membranes were prepared by melt intercalation method with internal mixer and two roll mills. MMT was intercalated or ekfoliated by the NBR and it was confirmed by X-ray diffraction method. D-spacing of the characteristic peak from MMT plate in WAXD was moved and diminished. Gas permeability, mechanical properties and thermal properties of the NBR-Clay hybrid membranes were investigated. Gas permeability through the NBR-Clay hybrid membranes decreased due to increased tortuosity made by intercalation of clay in NBR.

Improvement of Properties of Silica-Filled SBR Compounds Using NBR: Influence of Separate Load of SBR and NBR (NBR를 이용한 실리카로 보강된 SBR 배합물의 특성 향상 : SBR과 NBR의 분리 첨가 배합의 영향)

  • Choi, Sung-Seen;Kim, Beom-Tae
    • Elastomers and Composites
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    • v.40 no.1
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    • pp.29-36
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    • 2005
  • Mixing condition and procedure affect properties or a filled rubber compound such as filler dispersion, viscosity, and bound rubber formation. Influence of separate load of styrene-butadiene rubber (SBR) and acrylonitrile-butadiene rubber (NBR) on properties or silica-filled SBR compounds containing NBR was studied. Cure time and cure rate became faster as NBR content increased. The crosslink density increased with increase in the NBR content. The bound rubber content also increased as the NBR content increased. NBR content of the bound rubber was higher than that of the compounded rubber. The bound rubber content was higher when SBR and NBR were loaded separately than when loading simultaneously. The cure time and cure rate were slower for the separate load than for the simultaneous one. The crosslink density was also lower for the former case than for the latter one.

Mechanical Properties of Natural Rubber/Acrylonitrile-Butadiene Rubber Blends and Their Adhesion Behavior with Steel Cords (Natural Rubber/Acrylonitrile-Butadiene Rubber 블렌드의 기계적 물성과 강선과의 접착거동)

  • Sohn, Bong-Young;Nah, Chong-Woon
    • Elastomers and Composites
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    • v.36 no.2
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    • pp.111-120
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    • 2001
  • Mechanical properties and their adhesion behavior with zinc- and brass-plated steel cords of natural rubber/acrylonitrile-butadiene blend compounds were investigated as a function of blend ratio. The Mooney viscosity and stress relaxation time were found to be lowered with increasing NBR content. Tensile modulus generally increased with increasing NBR content. Tensile stress at break stayed constant up to about 40 phr and showed minimum at $50{\sim}60 phr$, and thereafter increased with increasing NBR content. Strain at break decreased linearly below 50 phr, and above the level it showed nearly constant value. Based on the abrupt drops in elastic modulus and tan ${\delta}$ peak, the glass transition temperature of NR and NBR were found to be -55 and $-10^{\circ}C$, respectively. In the case of NR/NBR blend compounds, two distinct transition points were observed and each transition position was not affected by NBR level indicating an incompatible nature of NR/NBR blend system. The pullout force and rubber coverage decreased to the level of about 40% to that of pure m compound, when the 50 phr of NR was replaced by NBR. However, the pure NBR compound showed the comparable adhesion performance with NR(${\sim}90%$). The sulfur concentration was found to become lower with the increased NBR content at the adhesion interface based on the Auger spectrometer results, representing a lack of adhesion layer formation, and this was explained for a possible cause of low adhesion performance with adding NBR.

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Cure Behaviors and Physical Properties of Recycled/Virgin Nitrile Rubber (NBR) Blends by High Temperature Shear-Crushing Technique (고온전단분쇄기술을 이용한 재생/신재 니트릴고무(NBR) 블렌드물의 가황거동 및 물리적 특성)

  • Park, Hyun-Ho;Kim, Joon-Hyung;Lee, Chang-Seop;Na, Seong-Taek
    • Applied Chemistry for Engineering
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    • v.16 no.6
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    • pp.842-847
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    • 2005
  • Virgin NBR and recycled NBR particles, which were pulverized from NBR scraps by high temperature shear-crushing technique, were blended with different mixing ratio. The effects of the recycled NBR content on the cure characteristics and physical properties of these blends were investigated and resistance properties of these blends to heat and various fluids were also studied. The study of cure characteristics showed that the viscosity increased but the scorch time decreased. The physical properties of rubber blends were improved with the addition of the recycled NBR for heat resistance and various fluid tests.

Effect of NBR Component on Adhesion Behaviors between NBR and Metal Joints Using Phenol Adhesive (페놀 수지를 이용한 NBR/냉연강판 접착계에 미치는 NBR 조성의 효과)

  • Lee, Dong-Won;Park, Hae-Youn;Yu, Young-Jae;Kang, Dong-Gug;Seo, Kwan-Ho
    • Polymer(Korea)
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    • v.32 no.1
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    • pp.1-6
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    • 2008
  • The adhesion behaviors and processability of NBR as a sealing material were investigated. In order to find the optimum formulation, the adhesive properties and processability were observed as the change of the contents of acrylonitrile (ACN) in NBR. Effects of Mooney viscosity, filler, plasticizer and crosslinking agent on the adhesion behaviors were also studied. The contents of ACN in NBR have great effects on adhesion behaviors and processability in NBR sealing. To know the optimum condition of roll mixing, degree of dispersion was investigated. It was confirmed that degree of dispersion was influenced by various factors such as mixing order, time, and temperature. The crosslinking system was studied as the observation of sulfur system, peroxide system, crosslinking density, and structure. From the variation of the dry condition and hexamine contents, the relation between adhesive and NBR was studied. These results show the adhesion properties and processability are dependent on the contents of ACN and crosslinking system.

A Study on Modification of NBR Rubber Roll (I) -NBR/PVC Blend Systems- (NBR계(系) 고무롤의 생성개질(物性改質)에 관(關)한 연구(硏究) (I) -NBR/PVC 혼합계(混合系) 고무-)

  • Seo, Kwan-Ho;Ko, Young-Cheol;Ha, Hyun-Dal;Cho, Ur-Ryong
    • Elastomers and Composites
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    • v.30 no.3
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    • pp.195-206
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    • 1995
  • To modify the NBR rubber roll which has poor abrasion and chemical resistance, NBR/PVC blends were prepared in various composition ratios. First of all, their miscibility and vulcanization characteristics were investigated. Their abrasion and chemical resistant properties and physical properties were also studied. DSC thermograms for NBR/PVC blends show only one Tg in the entire composition range, demonstrating a perfect miscibility. In the vulcanization characteristics tested by rheometer, maximum torque decreases as PVC contents increased. In the investigation of physical properties of NBR/PVC blends, hardness increases and elongation decreases along with the increasing contents of PVC. On the other hands, tensile strength increases with the increasing contents of PVC up to 11.1 wt. %, and then decreases with higher contents of PVC. While the abrasion resistance of NBR/PVC blends was similar to that of NBR itself, the chemical resistance of NBR/PVC blends was superior to that of NBR.

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Cure Behavior, Compression Set and Dynamic Mechanical Properties of EPDM/NBR Blend Vulcanizates (EPDM/NBR 블렌드 가황체의 가교 거동, 영구 압축 줄음율 및 동적 기계적 성질)

  • 박찬영
    • Polymer(Korea)
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    • v.25 no.2
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    • pp.233-239
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    • 2001
  • The ethylene propylene diene terpolymer (EPDM) blends with acrylonitrile butadiene rubber (NBR) were prepared by mechanical mixing method. Mooney viscosity, cure behaviors, compression set and dynamic mechanical properties were subsequently examined. Dynamic characteristics of the entire blends determined from a Rheovibron generally showed two glass transitions (T'$_{g}$s), -43$^{\circ}C$ and -4$^{\circ}C$ for NBR and EPDM, respectively. The tan $\delta$ peak monotonically shifted toward the higher temperature with increasing NBR content. It was also found that the optimum cure time was significantly decreased with loading of NBR.

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Preparation and Characterization of Rubber/Clay Nanocomposite Using Skim Natural Rubber Latex (스킴천연고무 라텍스를 이용한 고무/점토 나노복합체의 제조 및 특성)

  • Alex, R.;Kim, M.J.;Lee, Y.S.;Nah, C.
    • Elastomers and Composites
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    • v.41 no.4
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    • pp.252-259
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    • 2006
  • A new route for making rubber/clay nanocomposites was suggested based on skim natural rubber latex (SNRL), which is a protein rich by-product obtained during the centrifugal concentration of natural rubber (NR) latex. NR/acrylonitrile butadiene rubber (NBR) based nanocomposites were prepared from SNRL and NBR latex of 26 % acrylonitrile content by blending of aqueous dispersion of organoclay (OC) followed by coagulation, drying, mill mixing and vulcanization. X-ray diffraction(XRD) studies revealed that NR/NBR blend nanocomposites exhibited a highly intercalated and exfoliated structure, especially for NBR-rich blends. Dynamic mechanical studies showed that more compatible behavior was observed for NBR-rich blends. The 25/75 NR/NBR blend nanocomposite showed the best mechanical properties.

Morphology and Physical Properties of ABS/NBR Blends: The Effect of AN Content in NBR

  • Lee, Kwan-Hee;Ahn, Sang-Jun;Kim, Byung-Kyu;Jeong, Han-Mo
    • Macromolecular Research
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    • v.9 no.1
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    • pp.30-36
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    • 2001
  • Polybutadiene latex grafted (g-PB) in g-PB/SAN blends, i.e., acrylonitrile-butadiene-styrene terpolymer (ABS) were partially replaced by acrylonitrile-butadiene copolymer (NBR) with various acrylonitrile (AN) contents. Changes in morphology, physical and rheological properties were examined. The dispersed size of NBR was decreased as the miscibility with matrix SAM, was increased by increasing AN content in NBR upto 50 wt%. Impact strength was enhanced about two-fold due to the NBR dispersed with a slight larger size than the original g-PB. Gloss was effectively reduced as the particle size of NBR was increased. Tensile yield strength was decreased, and elongation at break or yield behavior at low shear rate were increased as g-PB was partially replaced by NBR having AN content less that 40 wt%.

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