| 摘要 |
<p>An aq. soln. of cyanamide, opt. mixed with =75 wt. % urea, is homogeneously distributed in epoxy resin. The mixt. is then hardened, opt. in the presence of accelerators, e.g. tert. amines. A 2-step process is pref. used, in which the epoxy resin and hardener soln. mixt. is (i) converted to a solid or lightly tacky, fusible B-condition at 80-130 degrees C, while evaporating most of water, and (ii) hardened at 100-180 degrees C. The hardened mixt. can be used to impregnate glass or other reinforcing fibres, to form reinforced epoxy resin articles, esp. laminates, or mixed with fillers in prodn. of pressed articles. Even distribution of aq. cyanamide soln. in resin is very quick.</p> |
