II
Abstract
Electron beam (EB) curing technology is one developing prospect technology with
advantages such as environmental-friend, efficiency, economy and energy saving, which
attract the great attention of research department and decision-making institution. In this
article, EB curable resin (novolac epoxy acrylate resin and EB/ moisture dual curable
novolac epoxy acrylate resin) were synthesized. The EB curing process, the properties
and the moisture curing process of coating were studied. The detailed research contents
and results are summarized as follows:
EB curable resin (novolac epoxy acrylate resin and EB/ moisture dual curable
novolac epoxy acrylate resin) were synthesized from bisphenol F type novolac epoxy
resin (F-51), acrylic acid (AA), γ-aminoropyl triethoxysilane (KH-550) and isophorone
diisocyanate (IPDI). The resulted product was characterized by Fourior-transform
infrared spectra (FT-IR) and proton nuclear magnetic resonance spectra (
1
HNMR). The
results indicated that the required products were successfully prepared.
Low energy electron beams was used for curing the synthesized resin. The effects
of irradiation dose on physical properties, gel content, FT-IR, thermogravimetric
analysis (TGA) and double bonds conversion of the cured coating were studied. The
results indicate that EB curing was a competition curing process crosslinking and
degradation, and 90kGy was the suitable EB irradiation dose. The physical properties of
the cured coatings with and without cationic initiator 432 addition were studied. The
results indicated that the pencil hardness of the cured coatings increased with increasing
double bonds content, while the flexibility decreased. And the silicone groups addition
could improve the adhesion and flexibility. EB could cure epoxy group with cationic
initiator 432 addition. The comparison curing method of EB-cure and UV-cure were
investigated with physical properties, TG, FT-IR and conversion of double bonds.
Moreover, polyurethane acrylate (PUA) resin was added into the synthesized novolac
epoxy acrylate resin as toughener. And the tensile mechanical properties of
PUA/F51-AA materials were test. PUA could improve the flexibility of the cured
coatings.
Irradiation dose, formula and temperature influence on moisture curing process
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