• Title/Summary/Keyword: rare coupling agent

Search Result 2, Processing Time 0.053 seconds

A Study on the Effect of Oyster Shell Surfase Modified with Rare Earth Coupling Agent on Eco-Friendly Bio-EPDM Foam (Rare earth coupling agent로 표면개질된 Oyster shell이 친환경 Bio-EPDM 발포체에 미치는 영향 연구)

  • Seo, Eun Ho;Lim, Sung Wook;Park, Kyung Soon;Park, Eun Young
    • Textile Coloration and Finishing
    • /
    • v.33 no.4
    • /
    • pp.317-326
    • /
    • 2021
  • In this study, we investigated for Bio-EPDM foam with oyster shell surface modified earth coupling agent. Experiments were carried out to confirm the bio-EPDM/Oyster shell foam applying content of earth coupling agent. The cure characterization were evaluated by measuring the mooney viscosity and oscillating disc rheometer (ODR). Mechanical properties such as hardness, tensile strength, elogation at break and tear strength were measured, and changes of mechanical properties were also evaluated after immersion in NaCl solution. In addition degree of volume change was measured after immersing the Bio-EPDM foam in NaCl solution and the low-temperature permanent compression set was evaluated at 4℃. To evaluate the low-temperature characteristics of Bio-EPDM/Oyster shell, the glass transition temperature was measured using Differential Scanning Calorimeter (DSC). As a result as the content of the earth coupling agent increased up to 3phr, the crosslinking density and mooney viscosity increased, and the mechanical properties and low-temperature permanent compression set improved, but from 4phr, it was rather decreased. The change in the glass transition temperature was insignificant, and the foam cell appeared to be uniform when the earth coupling agent was applied.

Study on Organic Binder for Anisotropic Rare-Earth Bonded Magnets (이방성 희토류 본드자석용 유기 바인더에 관한 연구)

  • Heo, Jeong-Sub;Cho, Yeon-Hwa;Nam, Sung-Cheol;Kim, Ji-Kyeong;Lee, Jung-Goo;Yu, Ji-Hoon
    • Journal of the Korean Magnetics Society
    • /
    • v.24 no.3
    • /
    • pp.86-89
    • /
    • 2014
  • Anisotropic bonded magnet is composed of magnetic powder and organic binder. organic binder in bonded magnet, serves to orientation of the powder. organic binder is composed of polymer resin, lubricant, hardener and coupling agent, etc.in this study, selection of the various components to producing an organic binder and by adjusting the composition ratio and concentrate, apply to bonded magnet for producing an organic binder that suitable for magnetic powder. so evaluation of magnetic properties and mechanical properties, the organic binder ratio and component was confirmed to suitable for bonded magnet.