Chemical Recycling of Carbon Fiber Reinforced Plastic with Sub- or Supercritical Fluids
In order to establish the recycling technique of carbon fiber reinforced plastic (CFRP), we investigated the optimum conditions to decompose epoxy resin used for matrix resin of CFRP using two kinds of sub-or supercritical fluids. First, subcritical water at 300-400℃ and 20MPa was used for the decomposition of epoxy resin and the recovery of phenolic monomers, where phenolic monomers mean phenol and isopropyl phenol. In the case of uncatalyzed reaction, the total yield of phenolic monomers increased with temperature and reaction time. The maximum of the total yield was 50％ at 400℃ and 60min. On the other hand, in the case of catalyzed reaction using 2.5wt％ potassium carbonate, the total yield increased with reaction time until 45min. However, after 45min, it decreased with the reaction time because the monomers decomposed in subcritical water. The maximum of the total yield was 72％ at 400℃ and 45min. Second, supercritical methanol at 250-350℃ and 10MPa was used for the decomposition and solubilization of epoxy resin at 5-120min of reaction time. In the case of uncatalyzed reaction, the crosslinked structure of epoxy resin was decomposed selectivity and the uncured resin dissolved in supercritical methanol at higher than 270℃ within 1h. When the temperature decreased to 250℃, whole epoxy resin dissolved in supercritical methanol for 2h. MALDI-TOF/MS analysis of the decomposed and methanol-soluble epoxy resin indicated that the main chain of epoxy resin did not decompose and the ester bond decomposed selectively.
CFRP Chemical Recycling Sub-critical water Supercritical Alcohol
I. OKAJIMA K. ARAYA M. HIRAMATSU T. SAKO
Shizuoka Universut, Hamamatsu, Japan
国际会议
北京
英文
677-681
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）