海量資源,盡在掌握
 石蠟是從原油蒸餾所得的潤滑油餾分經(jīng)溶劑精制、溶劑脫蠟或經(jīng)蠟冷凍結(jié)晶、壓榨脫蠟制得蠟膏,再經(jīng)溶劑脫油、精制而得的片狀或針狀結(jié)晶。石蠟為無色至白色半透明結(jié)晶狀固體,無臭、無味,密度0.82~0.90g/cm3,熔點(diǎn)50~70℃,沸點(diǎn)為 (共 805 字) [閱讀本文] >>