• 한국산업융합학회 논문집
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• 제2권1호
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• pp.69-75
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• 1999

Intending to develop a new rubber curing process using only microwave, the both the characteristics of cure and the mechanical properties of rubbers for the tire tread, for which a green styrene-butadiene compounds had been cured with 2.45 GHz microwave, have been compared with those of the custom thermal cured rubber. The unintentional hot spot formation in the compound during the microwave curing has not found where the compound has a microwave absorbing ceramic powders in 4.18 weight percents and the supplying voltage has been adjusted to 90 volts. The new microwave process accomplished preheating to 418K in a quarter of the thermal cure time. The average tensile strength of the microwave-cured rubber indicating $190kg/cm^3$ was compatible to that of the thermal cure. In conclusion, the new microwave cure had approved to be applicable in a commercial plant.

• 폴리머
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• 제38권3호
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• pp.406-410
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• 2014

아연이온이 포함된 thiuram 구조를 가진 zinc dibutyldithiocarbamate(ZDBC)와 아연이온을 포함하고 있지 않은 thiuram계 촉진제인 tetramethylthiuram disulfide(TMTD), dipentamethylenethiuram tetrasulfide(DPTT)를 실리카가 충전된 천연고무에 첨가하여 가황특성 및 기계적 물성(모듈러스, 인장강도, 신장률)에 미치는 영향을 비교 평가하였다. ZDBC는 가장 빠른 반응개시시간(t10)과 높은 보강성(R.I.), 그리고 marching 거동을 보였다. 메커니즘을 고찰하고 제시하였다.

• Bulletin of the Korean Chemical Society
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• 제22권10호
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• pp.1145-1148
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• 2001

• 접착 및 계면
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• 제17권1호
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• pp.1-6
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• 2016

본 연구에서는 신발에 사용되는 부품 중 겉창용 고무 접착에 있어서 buffing, 프라이머 처리와 같은 전처리 공정을 생략하기 위하여, propanamine과 1,6-Hexanediamine와 같은 아민류의 첨가제가 적용된 고무 성형물에 대한 접착특성과 기계적 특성을 고찰하였다. Propanamine과 1,6-Hexanediamine이 첨가되지 않은 고무 시편과 propanamine이 첨가된 고무 시편은 접착성이 발현되지 않았지만 1,6-Hexanediamine이 첨가된 고무 시편의 경우 접착성 효과가 개선되었다. 또한 propanamine과 1,6-Hexanediamine이 첨가된 경우 접촉각이 감소하였으며, 1,6-Hexanediamine이 첨가된 고무 시편이 propanamine이 첨가된 시편에 비해 작은 접촉각을 나타내었다. 고무 표면의 $-NH_2$에 대한 피크는 $1450{\sim}1550cm^{-1}$의 그룹에서 FT-IR 분석 결과로 확인하였다. propanamine과 1,6-Hexanediamine이 첨가된 경우 기계적 특성 저하와 마모 특성이 감소하였다.

• 한국임상수의학회지
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• 제24권2호
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• pp.201-207
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• 2007

The teat cup liner compounds with improved physical property were developed using tri-polymer blend of natural rubber(NR), ethylene propylene diene monomer rubber(EPDM) and butyl rubber, and the changes of the physical properties of compounds were measured under various conditions such as standard, thermal, alkaline detergent and acid solutions aging conditions. The hardness of the new teat cup liner compound 1 was 50 and that of the compound 2 was 51 under standard condition. The tensile strength and elongation of the new compound 1 were $154kgf/cm^2$ and 675% under the standard condition, respectively. Also, those of the new compound 2 were 180 kgf/cm and 634% under the same condition. Their hardness were increased about $2{\sim}6%$ and the tensile strength and elongation were decreased about 10% under the $25^{\circ}C$ water and detergent solutions. Even though the new teat cup liner compounds exhibited so much decreased tensile properties under the $105^{\circ}C$ thermal aged condition, they sustained more stable aged physical properties including tensile strength and elongation than those of imported teat cup liner materials. Consequently, the new teat cup liner compounds would give prolonged lift cycle if they are used as a teat cup liner product.

• 항공우주시스템공학회지
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• 제4권4호
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• pp.1-10
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• 2010

The basic factor that affect wear performance is the wear characteristics, which come from sliding friction between rubber compound and road. Thus, this study focused on friction and wear of rubber. This paper briefly explain some characteristics of friction and wear referring to the papers on wear of rubber that scholars researched on. Research activities to predict the performance of the rubber wear is also explained.

• Elastomers and Composites
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• 제56권3호
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• pp.152-163
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• 2021

Liquid butadiene rubber (LqBR) is used as a processing aid and plays a vital role in the manufacture of high-performance tire tread compounds. In this study, center-functionalized LqBR (C-LqBR) was polymerized with different vinyl content via anionic polymerization. The effects of the vinyl content on the properties of the compounds were investigated by partially replacing the treated distillate aromatic extract (TDAE) oil with C-LqBR in silica-filled rubber compounds. C-LqBR compounds showed a low Payne effect and Mooney viscosity regardless of the vinyl content, because of improved silica dispersion due to the ethoxysilyl group. As the vinyl content of C-LqBR increased, the optimum cure time (t₉₀) increased owing to a decrease in the number of allylic hydrogen. Moreover, the glass transition temperature (T_g) of the compound increased, and snow traction and abrasion resistance performance decreased, whereas wet grip improved. The energy loss characteristics revealed that the hysteresis attributed to the free chain ends of C-LqBR was dominant.

• Elastomers and Composites
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• 제47권1호
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• pp.23-29
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• 2012

실리카가 충전된 천연고무 복합소재 내에서 실란 함량의 증가가 실리카간의 구조 발달 상수 (${\alpha}_F$)에 미치는 영향을 비교하였다. 동일한 실리카양 (10, 20, 30, 40 phr)에서 실란의 함량 (2, 4, 6, 8, 10, 12%)이 증가할수록 ${\alpha}_F$값이 증가하는 경향이 나타났다. 이는 실란내 존재하는 황이 가교에 참여하였기 때문인 것으로 판단된다. 또한 실란 함량이 같은 조건에서 실리카양이 증가할수록 ${\alpha}_F$값이 증가하였는데 이는 실리카 간 상호관계가 증가하였기 때문인 것으로 판단된다.

• Elastomers and Composites
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• 제1권1호
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• pp.49-55
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• 1966

Based upon the results of the previous work, the experiments are concentrated on the improvement of the durability of rubber coated fabrics as a rain garment material. To obtain a much lighter and durable coated fabric, several kinds of light weight cotton prints having almost equal density in warp and fillingwise were chosen. Rubber coating on these prints was made by topping and spreading process using rubber compound of various viscosity, and the physical properties of final product were analysed and interpreted in terms of adhesion and durability. The results are as follows. 1. Any noticeable difference between two coating processes was not found in terms of physical properties. 2. Base fabrics should be dipped once into a dilute rubber compound before coating operation in order to obtain a uniform adhesion and physical properties, and the optimum range of the viscosity of dipping paste are from 100 poise to 200 poise. 3. Generally, the tearing strength of the coated fabrics is inversely proportional to the adhesion. 4. It was assumed that the increase of the water proofness after water immersion on the finished material which have dense base fabric is chiefly due to the swelling of the cellulosic fiber.

• Elastomers and Composites
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• 제44권1호
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• pp.47-54
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• 2009

본 연구에서는 다양한 종류의 보강제를 혼합한 EPDM 컴파운드의 원적외선에 의한 가교 반응을 조사하였다. 보강제가 원적외선에 의한 가교 반응에 미치는 영향을 평가하기 위하여 컴파운드의 발열 온도 및 DSC 분석에 의한 가교도를 측정하였으며, 특히 원적외선에 의한 가교 특성을 비교하기 위하여 동일 조건에서 열풍에 의한 가교 반응을 조사하였다. 원적외선 가교 조건에서 카본블랙을 혼합한 EPDM 컴파운드는 입자크기가 증가함에 따라 열전도도가 증가하며 이에 따라 원적외선에 의한 가교도 역시 증가하였으나, 열풍에 의한 가교도의 변화에는 거의 영향을 주지 못하였다. 보강제 종류에 따른 원적외선 가교 특성 평가 결과, 열전도도가 높은 아세틸렌 블랙을 함유한 컴파운드의 가교도가 가장 높게 나타났으며, 열전도도가 유사한 카본블랙 및 침강실리카의 경우 상대적으로 원적외선 흡수 특성이 우수한 침강실리카 배합 컴파운드의 경우 원적외선에 의한 가교도가 높게 나타났다.