STUDIES ON THE DYEING OF DIFFICULT DYEING FIBERS

The effect of temprature on the absorption of M0 or W by vinylon, 6-nylon or wool, and the chemical structure of the complex acid absorbed by vinylon or 6-nylon are studied.1) The velocity of absorption of M0 or W by vinylon, 6-nylon and wool is temperature dependent, but the rate of absorption curves from a finite bath leading to some equilibrium absonption independently of temperature.2) Where the gram atom total of M0 and P is constant, it shows the maximum absorption of M0 by vinylon at the ratio of M0 to P is 3:1 in complex acid solution.3) At the constant concentration of M0, the absorption of M0 and P by vinylon or 6-nylon appears to increase with increasing the concentration of P, with an upper limit of around the ratio of M0:P; 3:1 in complex acid solution, and in the this equilibrium absorption on fiber, the ratio of M0:P shows 12:1, which suggests the molecular structure of the complex acid is 3H2O•P2O5•24•M0O3.