グラフト共重合を利用したレーヨンの一防燃加工法

抄録

The purpose of the work is to enhance the limiting oxygen index (OI) value of a rayon cloth (original OI, less than twenty) to more than thirty by a washable finish by use of the synergistic effect of nitrogen, phosphorus and chlorine. The nitrogen was introduced by the graft-copolymerization of acrylamide into the rayon cellulose, the phosphorus and chlorine by the cure with tetrakis (hydroxymethyl)phosphonium chloride after the hydroxymethylation of the grafted rayon cloth with formaldehyde. The best conditions for the graftcopolymerization of acrylamide were the initiator, 0.01mol/1 (NH₄)₂S₂O₈, the monomer, aq. 10% acrylamide, the reaction temp., 50°C, the reaction time, 2hr and the bath ratio, less than 1:50. The hydroxymethylation of the grafted sample was carried out with aq. 12% formaldehyde of pH 11 at 50°C for 2hr. THPC-cure was carried out at 145°C for 5 min after impregnating of 47% THPC solution containing 8% triethanolamine and predrying at 85°C for 5 min.
The OI value of the finished sample increased with increase of the total add-on and reached more than thirty at more than twenty % of the total add-on upon the rayon cloth.