Dyeing Behavior and Color Fastness of Polyurethane Resins with Different Glass Transition Temperatures

YOSHIKURA Niko, MOCHIDUKI Yuna, ENOMOTO Masao, SHIRAI Kazuaki, TOKINO Seiji

doi:10.11419/senshoshi.64.12_750

<p>This research aims to develop synthetic leather that can be dyed with disperse dyes. In this study, films were first prepared using polyurethane (PU) resins at different glass transition temperatures (Tg), and the dyeing behavior and color fastness of the films were investigated. Thereafter, a grain-dyeable artificial leather dyed with a disperse dye was prepared as the base material. PU resin was overcoated on these surfaces, and the relationship between the dye migration prevention performance and Tg was investigated. In addition, synthetic leather was obtained using these PU resins as the grain layer resin. Reduction cleaning was performed after dyeing, and the dyeability and color fastness of the PU resin were evaluated. The results suggest that the dyeing speed at each dyeing temperature changes according to the Tg. During low-temperature dyeing, PU resin with low Tg possessed faster dyeing speed and higher dyeing amount. At a dyeing temperature of 100 °C, dyeing proceeded rapidly for all the PU resin films, and the equilibrium dyeing amount was confirmed to increase with an increase in Tg. In contrast, when the dye migration prevention performance of PU resin was examined, the migration of dye molecules was confirmed to suppress with an increase in Tg. Furthermore, when PU resin was used as the grain layer of synthetic leather, it was confirmed that the PU resin with high Tg can be used for reduction cleaning, and it shows good results in terms of dyeability and color fastness.</p>

Dyeing Behavior and Color Fastness of Polyurethane Resins with Different Glass Transition Temperatures

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