| 摘要 |
A sealing compsn. consists of epoxy resin 15-20 wt.%, inorg. fillers 68-72 wt.%, hardener 5-25 wt.%, pref. 15-20 wt.%, hardening accelerator 0.2-0.8 wt.%, and polar compd. 0.3-0.7 wt.%. The said epoxy resin, such as bisphenol-type epoxy, has an equiv. of 200 230 and a softening temp. of below 90≦̸C. The inorg. filler is pref. fused silica powder, which has few impurities, fine particle size and low thermal expansion coeff. The hardener is pref. phenol resin with a phenol equiv. of below 200. The polar compd. such as triethylene glycol is used for increasing fluidity. The sealant shows no problem after it is steamed with 2 atm. pressures for 800 hrs.
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