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Preparation and electrodeposition properties of trimethylolpropane–toluene diisocyanate–dimethylaminoethanol/2‐ethylhexanol resins
Author(s) -
Yang ChinPing,
Chen YahnHaur
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.1992.070450615
Subject(s) - trimethylolpropane , toluene , cationic polymerization , epoxy , toluene diisocyanate , polymer chemistry , chemistry , yield (engineering) , tertiary amine , acetic acid , materials science , organic chemistry , polyurethane , composite material
2,4‐Toluene diisocyanate (TDI) was partially blocked with equimolar mixtures of dimethylaminoethanol (DMAE) and 2‐ethylhexanol (2EH) of different ratios to form the DMAE/2EH half‐blocked TDIs, which were subsequently reacted with 1/3 mol trimethylolpropane (TMP) to yield the trimethylolpropane–toluene diisocyanate–dimethylaminoethanol/2‐ethylhexanol (TMP–TDI–DMAE/2EH) resins having various content of tertiary amine groups. These resins were neutralized with acetic acid and then dispersed in deionized water, resulting in the milky emulsions used for cationic electrodeposition. Some electrodeposition properties, such as deposition yield, conductivity, rupture voltage, and throwing power, of the resins were investigated. In addition, one of the obtained resins (added as a crosslinker) and an amine–epoxy adduct were codispersed in deionized water, and the nature of electrodeposition of the two‐component emulsion is discussed.