抄録
The rub-fastness tests were carried out on needle-shaped iron oxide particles with different specific surface areas. Results were analyzed from kinetic viewpoint and compared with those obtained for spherical iron oxide particles. The removal process of needle-shaped particles by rubbing can be also treated as a reversible reaction of first order. The rate constant (k1) of transfer of particles from adhered fabric to white cloth, the constant (k-1) of the reverse process. of k1, the equilibrium constant (K=k1/k-1), and the removed amount (x/A) of particles by rubbing decreased with increasing particle size in a certain range, while those of spherical particles increased with increasing particle size. The rate constant k-1 and the slopes of lines obtained from the plots of ln k1 vs. 1/W, ln k-1 vs. 1/W and ln K vs. 1/W, where W is the load weight, depend little on the particle size. These results were analogous to those obtained for spherical particles.
