Ag 함유 프리커서 핏치의 용융방사 = Melt spinning of Silver - containing Precursor Pitches

국문 초록 (Abstract)

은 함유 탄소섬유를 제조하기 위해서 핏치에 AgNO₃를 첨가하고 방사하였다. AgNO₃는 핏치의 개질전과 개질후 2가지 방법으로 혼합하였다. AgNO₃를 첨가하면 방사조건이 AgNO₃를 첨가하지 않는 경우와 다르므로 온도, 압력, 권취속도를 달리하여 각각 최적 방사 조건을 선정하였다. 개질시에 첨가할 경우는 일반 등방성 펏치와 연화점, 점도 변화가 유사하며 335℃에서 가장 좋은 방사성을 보였고, 개질 후 첨가하면 AgNO₃의 함량에 따라 연화점, 점도가 비례하여 상승하였으며 약 10℃ 높은 345℃에서 가장 좋은 방사성을 나타냈다. 또한 방사노즐 직전에 분배기를 설치하여 방사성을 향상시키고 최종 탄소섬유내 Ag의 분포를 균일하게 조절할 수 있었다.

다국어 초록 (Multilingual Abstract)

To prepare silver-containing carbon fibers, silver nitrate was added to pitch and melt-spinning was performed. Silver nitrate was added by two different methods. One was the addition of it to raw pitch before reforming and the other was added to reformed pitch. The optimum spinning conditions were investigated by changing the spinning temperature, pressure, and winding speed. When silver nitrate was added to raw pitch, the softening point, viscosity, and spinnability of the reformed pitch were similar to those of non-silver-containing pitches. Because the decomposition of AgNO₃was occurred during the reforming. The spinnability and productivity of this pitch were good at 335℃. When silver nitrate was mixed to reformed pitch, the softening point and viscosity of mixed pitch increased in proportion to the amount of silver nitrate and the best spinning temperature was 345℃. Ag was uniformly distributed in the carbon fibers by installing the wire mesh in the spinneret.