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Synthesis and properties of cationic resins derived from urethane‐modified epoxy resins and methylethanolamine
Author(s) -
Yang ChinPing,
Lee LungTa
Publication year - 1992
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1992.070450617
Subject(s) - toluene diisocyanate , cationic polymerization , isocyanate , epoxy , emulsion , toluene , polymer chemistry , polyurethane , synthetic resin , materials science , acetic acid , chemistry , organic chemistry
Six urethane‐modified cationic resins were synthesized by reacting half‐blocked polyglycoltoluene diisocyanate–urethane (half‐blocked‐PG–TDI–urethane) and 2‐ethylhexanol‐blocked toluene diisocyanate (2‐EH‐blocked‐TDI) modified epoxy resins with methylethanolamine and subsequent neutralization with acetic acid. Three different polyglycols were used to react with toluene diisocyanate to from isocyanate‐terminated urethanes ( 1a–c ) and subsequently two different monoalcohols were added to react with 1a–c to give half‐blocked‐PG‐TDI‐urethanes ( 2a–f ). These cationic resins were then dissolved in suitable solvents and mixed with deionized water to form emulsions. The crosslinking properties, emulsion, and electrodeposition properties of these resins were studied in some detail. The deposition yields of emulsions prepared from urethane‐modified epoxy resins were higher than those of other emulsions. The pencil hardness of the crosslinked films of urethane‐modified resins were lower than that of non‐urethane‐modified resin. The emulsion and electrodeposition properties of the cationic resins were also deeply affected by the nature of the pendant positively charged group contained in the resins.