抄録
1. The acid and alkali hydrolysis resistance of the cotton finished with dimethylolethylenethiourea (DMETU) was investigated and the results were compared with the cases of dimethylolethyleneurea (DMEU), dimethylolthiourea (DMTU), dimethylolurea (DMU) and formaldehyde finishes.
The order of durability to acid and alkali hydrolysis of these crosslinked fabrics is as follows; acid durability, alkali durability,
Therefore, DMETU finish has high durability to alkali hydrolysis and also considerable durability to acid.
From these results, it may be seen as a rule that DMTU or DMETU finish shown apparently higher acid hydrolysis resistance than DMU or DMEU finish. This is probably due to the reason why electron density on the amido nitrogen in the thioureas is smaller than in the ureas, since=S bond is more electron attractive than=O bond and accordingly resonance effect of the thioureas becomes more predominant than the ureas:
2. The strength loss by scorch test on bleached DMETU finished fabric is somewhat larger than that on DMEU finished fabric, but chlorine retention of the fabric is rather smaller than that of DMEU. This result does not perfectly support the inference proposed by D. D. Gagliardi. Yellowing by scorching, however, is a great defect of DMETU finish.
