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단일교차점기법에 의한 천연고무내 카본블랙 부하량의 최적화

Optimization of Carbon Black Loading in Compounding of Natural Rubber by Unique Cross Point Technique

손봉영 박찬영

Sohn B Park C

HWAHAK KONGHAK, February 1996, 34(1), 83-90(8), NONE

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Abstract

타이어 산업에서 고무배합물에 필요한 충전제인 카본블랙의 최적부하량을 명확하게 제시하여 주는 단일교차점기법이 제안되었다. 이 기법은 무니점도계와 DSR 두 개를 동시에 사용하여 최적부하량을 결정하는 장점이 있다. 본 연구에서는 카본블랙 부하량에 따른 무니점도(ML1+4,125℃), ηx는 그 부하량 X와 그 특성치 γ의 함수로 표현되었다. 즉, ηx=ηoㆍγㆍ(1+a₁X+a₂X²). 또한 DSR의 회전우력을 2초간 적분한 값의 상대비 Sr’은 위의 부하량 X에 대하여 다음 식으로 표현되었다. Sr’=b₀+b₁X. 이 두 식의 교점으로 나타난 양의 카본블랙을 부하시킨 천연고무배합물이 가교 처리 후에 용도별로 가장 바람직한 물성을 나타내는 것을 인장시험기, 피코마모시험기 및 플렉소미터로 확인하였으며, 현장에서 적용할 수 있는 위 식들에 대한 실험실적 계수들을 Table 2에 제시하였다.

The Unique Cross Point technique, offering uniquely the optimum loading of carbon blacks a reinforcing filler required in rubber compounds in tir industry, has been proposed. The strength of the technique lies in opti-mizing the feasible loading by both Mooney viscometer and DSR(Dynamic Stress Relaxometer) simultaneously. In this study, the Mooney viscosity(ML1+4,125℃) ηx as a function of its loading X and characteristic value γ was expressed as ηx=ηoㆍγㆍ(1+a₁X+a₂X²). And also Sr’, the relative integral in two seconds of torque from DSR, was a function of X as follow Sr’=b_o+b₁X. After thermal cure the natural rubber compounds loaded with the quantity designated by the cross section of the above two equations showed so feasible properties confirmed by tensile tester, Pico abrasion tester and Flexometer that the experimental coefficients of the equations applicable to fields are listed in Table 2.

Keywords

Optimization Carbon Black Compounding Natural Rubber Dynamic Stress Relaxometer Optimum Loading

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