Abstract: In this paper, the small organic cation molecules were used as molecule companions of reactive dyes, a dyeing acceleration theory of molecule companion(DATMC) of reactive dyes on dyeing silk was invented and studied. The results showed that small organic cation molecule had wonderful dyeing acceleration effect. The greater of the hydrophobic chain of small organic cation molecule was, the better of dyeing acceleration effect was. But if the carbon atom number of hydrophobic hydrocarbon chain of small organic cation molecules was equal to or more than 12, the small organic cation molecule would hinder the fixation reaction of reactive dye on silk. On the contrary, if it was equal to or less than 8, the fixation reaction would not be affected. In the dyeing process, if the accelerant was added in several times, the silk could be dyed uniformly. If we needed the hydrophobic part of accelerant was great enough, and the carbon atom number of hydrophobic hydrocarbon chain of accelerant was equal to or less than 8, the hydrophobic part could be designed in the two hydrocarbon chain. Octyl trimethyl ammonium bromide(OTAB) and dihexyl dimethyl ammonium bromide(DHDAB) were useful dyeing accelerants, when the concentrations of OTAB and DHDAB were very low, the dyeing accelerations effect were good enough. The dyeing acceleration theory of molecule companion of reactive dyes was clearly dyeing theory.

Key words: silk, reactive dye, molecular companion, small molecule cation, principle of dyeing accelerating