Abstract:

A switchable surfactant dodecyl tetramethyl guanidine (DTMG) was synthesised by tetramethyl guanidine and bromododecane to real-ized the recycled of residual foam in foam dyeing. DTMG transforms into dodecyl tetramethyl guanidine bicarbonate (DTMG?CO2) by bubbling CO2, which is of superior foaminess with a foaming ratio of 11.23 and foam half time of 126 s and can be used as foaming agent in pigment foam dyeing process. However, DTMG?CO2 containing in the residual foam re-leases CO2 by heating at 80 ℃ and transforms to the poor foaminess structure, i.e. DTMG again, which realizes rapid rupture and recycle of residual foam. With the foaminess controllable property by alkylguanidine-type switchable surfactant, it can apply in recycled pigment foam dyeing process due to the reversibility of the transformation between DTMG and DTMG?CO2 , little effects of pigment, adhesive and foam stabilizer on foaming switchable property and switch reversibility and satisfactory dyeing results. Key words: switchable surfactant；alkyl guanidine；foaming agent；pigment foam dyeing；recycled dyeing

Key words: switchable surfactant, alkyl guanidine, foaming agent, pigment foam dyeing, recycled dyeing