Abstract
The relation between pH of uncondensed urea formaldehyde solution for the crease resistant finish or resin contents of the treated fabrics and its crease resistancy, tensile strength and elongation; and the effects of the catalysts (hydrochloric acid, buffer, basic aluminium chloride, dimetyl aniline hydrochloride, pyridine hydrochloride, picoline betaine hydrochloride) on the relations described above were studied, and obtained the following results. (1) Crease resistancy increases with the increase of the resin contents of the treated fabric and the decrease of pH value of the solution for the treatment. This relation could be applied to one catalyst, but it differs by the kind of the catalysts. (2) The effects of the catalysts on the increase of crease resistancy of the fabrics treated with solution of same pH value or contained same amount of resin were studied, and it was found that the latent catalyst had the better effect on this property. Especially, picoline betaine hydrochloride catalyst (Nippon Patent No.201708. 1953) shows the best result on this property. (3) The fabric obtained the maxinum increase of strength by the treatment of resin solution having pH value of 4. 4. This maximum increase of strength has same value for each catalysts and has no relation to the kind of the catalysts. (4) The resin contents of the treated fabric which give the maximum increase of strength is not the same to the each catalysts, and the latent catalyst had the maximum point at the higher resin contents of the fabric. (5) Elongation of the treated fabric is related to the resin contents of the fabric, and not to the kind of the catalyst. (6) Imbibition value is also related to the resin contents of fabric, and the formation of the linkage between cellulose molecular chain by the resin treatment is not deduced with the decrease of imhibition value.
