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수지 첨가제가 배합고무의 물성 및 황동 피복 스틸코드와 접착거동에 미치는 영향
전경수(Gyung Soo Jeon),정승원(Seung Won Jeong),서곤(Gon Seo) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.3
The physical properties of rubber compounds and adhesion characteristics with brass-plated steel cord were investigated with the loadings of resin promoters. Resorcinol formaldehyde resin(RFR) as methylene acceptor was loaded from 0 to 4 phr, and hexamethoxymethylmelamine(HMMM) as methylene donor from 0 to 5 phr. With loading RFR and HMMM on rubber compounds, cure rate and maximum torque were decreased. The modulus of the rubber compound with low loading(2 phr) of RFR was slightly high, but the modulus was low for high loading(3 phr) of RFR additives. Tensile strength and elongation at break were varied with the loading amount and the ratio of resin promoters. The changes in the physical properties with resin additives were responsible for the formation of viscous resin layer at adequate addition, but lubricant and dilution effects at excessive loading. Adhesion properties of unaged adhesion samples containing RFR and HMMM were poor, but those after humidity aging treatment were enhanced. But the adhesion properties were poor at the rubber compound of inappropriate ratio and excessive loading of resin promoters. The high viscous resin layer formed for RFR and HMMM might suppress water diffusion to the adhesion interface during humidity aging, resulting in the slow rate of adhesion degradation of rubber compound containing resin promoters. The change in the cure rate was large with HMMM addition comparing to RFR, whereas the effect of RFR addition on the adhesion properties and the physical properties was relatively large due to its high molecular weight and viscosity.
천연고무 / 부타디엔고무 ( NR/BR ) 혼합고무와 황동피복코드의 접착성질
전경수(Gyung Soo Jeon),손봉영(Bong Young Sohn),정승원(Seung Won Jeong),조평래(Pyung Lae Cho),조춘택(Choon Tack Cho),서곤(Gon Seo) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.1
Physical properties and adhesion characteristics of blended rubber compounds composed of natural rubber(NR) and butadiene rubber(BR) were investigated. With increasing BR content, crosslinking density was increased due tn the inhibition of reversion. As a result, Young`s modulus was increased, while tensile strength and elongation measured at break point was decreased due to the decrease of tear energy. High values of rubber coverage of these adhesion test samples showed that the strength of adhesion interface was relatively higher than that of rubber layer. Pullout forces decreased with increase in the BR content. A good relationship between pullout force and tensile strength of the blend is observed, indicating that pullout force is mainly dependent on the fatigue properties of the blend. Interaction between NR and BR in the blended rubber compounds for the adhesion with brass-plated steel cord was not observed.
시클로헥산올의 탈수소화 반응에서 담지 구리촉매의 담체에 따른 활성저하 비교
전경수,서곤,정종식 ( Gyung Soo Jeon,Gon Seo,Jong Shik Chung ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.5
The deactivation of copper catalysts supported on magnesia, zinc oxide and silica in the dehydrogenation of cyclohexanol to cyclohexanone was examined. The effect of support on the deactivation was discussed in the aspects of the sintering of copper particle and carbon deposition. Slow deactivation of copper catalyst supported on silica comparing with those supported on magnesia and zinc oxide was interpreted by relatively slow progressing rate of sintering of copper particle and small amount of carbon deposit.
전경수,손봉영,전대진,조평래,서곤 ( Gyung Soo Jeon,Bong Young Sohn,Dae Jin Jeon,Pyung Lae Cho,Gon Seo ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.4
The adhesion properties between rubber compounds and steel cord were investigated with respect to the cure rate. Sixteen kinds of rubber compounds whose cure rate indices were ranged from 7 min^(-1) to 17 min^(-1), were prepared by changing the type and loading amount of accelerators and prevulcanization inhibitor(PVI). Cure properties of rubber compounds and the physical and adhesion properties of cu0red samples were examined. The effect of cure rate on the adhesion properties at initial and aged condition was not significant, if the cure time was optimally determined from the cure rate index. The factors on the cure rate such as type and loading of accelerator and loading of PVI, could be represented integratively in terms of cure rate index to obtain the optimum cure time for a stable adhesion system.