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Synthesis and properties of cationic resins derived from polyether/polyester‐modified epoxy resins
Author(s) -
Lee LungTa,
Yang ChinPing
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.1992.070460607
Subject(s) - epoxy , cationic polymerization , polyester , emulsion , materials science , gelcoat , synthetic resin , polymer chemistry , solvent , chemistry , organic chemistry , composite material
Four polyether and one polyester‐modified cationic resins were synthesized by reacting polyether/polyester‐modified epoxy resins with 2‐ethylhexanol‐blocked‐toluene diisocyanate (2‐EH‐blocked TDI) and diethanolamine and subsequently neutralizing the resins with acetic acid. Four different polyethers and one polycaprolactone diol (PCP) were used to react with epoxy resin to form polyether‐modified epoxy resins (1a–d) and polyester‐modified epoxy resin (1e). The extent of reaction of epoxy resin and polyether or polyester was evaluated by the change of epoxy equivalent weight and the gel permeation chromatography curve of the resulting product. Cationic resins were dissolved in suitable solvents and were mixed with deionized water to form emulsions. Some factors, such as pH value of emulsion, solvent content, and applied voltage affecting the emulsion and electrodeposition properties, were investigated. Cationic resins, prepared from PPG (#1000)‐modified epoxy resins, yielded a wider pH range of stable emulsion and also yielded deposited films with a pleasing appearance. PEG (#1000)‐modified cationic resins produced a higher deposition yield, but higher throwing power was obtained by deposition of the PCP (#530)‐modified cationic resins.