DE411798C - Process for achieving wool effects on acetyl cellulose webs - Google Patents

Description

Process for achieving wool effects on acetyl cellulose webs. During the acid dyeing of acetyl cellulose webs, the observation was made that that the acetate silk became woolly at an increased temperature of the 1? whereby the gloss of the goods was significantly impaired or a matting of the Fiber took place.

When using acids other than acetic acid and formic acid, such as z. B. hydrochloric acid, sulfuric acid, phosphoric acid, it was found that despite compliance At elevated temperatures, the woolly, «oak effect is not at all or then only slightly occurred. As a result, the tangling effect of the acetyl cellulose webs had to be can be attributed to acetic acid, especially as the concentration increases the same ever more matt effects could be achieved.-It has now been found that not only acetic acid and formic acid are suitable for achieving these wool effects, but that one should follow the example of the treatment of cellulose with organic acids also such acids to achieve soft-grip # @ ollefekte on acetyl cellulose webs can be allowed to act, provided that with 8 to 15 percent concentrations work is carried out continuously at boiling temperatures for a prolonged period. The temperature and the concentration of the organic acids play an essential part in this Role than one with sustained boiling temperature and with increased concentration of the organic acids an increased w orking or: an increase in volume of the Fiber received. Of course, the organic acid, e.g. B. acetic acid, not too strong be to avoid the risk of dissolving the acetate floss by then removing the fibers could be attacked in such a way that the strength and elasticity thereof are great decreased, which would make subsequent processing for tissue purposes impossible: Off For this reason, it is advisable to use protective colloids in the strongly acidic dye baths at the same time to add, so that an excessive acid attack is prevented or held back will.

With further expansion of the process it has also been shown that salts have an inhibiting effect on too frequent attack by organic acids, especially those salts which have a precipitating effect on dissolved or partly in solution cause any Azewl celluloses. For very woolly or souply effects Acetic acid is particularly suitable on acetate strands or pieces of acetate, as this Has a dissolving effect on the oil acetate cellulose at elevated temperatures. By Cooking soaps, barium salts, phenolic-like bodies, etc. can also create matte effects achieve, yes these mostly only cause a molecular change or destruction of the fiber, but not a souplige matting or swelling, «-O depending on the treatment, the thread reaches up to 5 times its volume.

The method is suitable for strands. Pieces, mixed fabrics in dyed and undyed state, especially for those mixed fabrics that consist of Acetate silk mixed with various natural and artificial textiles, where woolly or matt effects are desired.

Example. r kg of acetate silk is placed on sticks in a liquid bath or bubble bath, consisting of 8 percent acetic acid solution, which is mixed with Solid soap is added in such a way that the fatty acid I /., percent of the used Bath liquid corresponds. Work is continued at boiling temperatures during one hour; the goods are then thoroughly washed out with water, then soaped and, if desired, on a soft water bath acidified with amcic acid with an oil emulsion treated to maintain grip.

Claims (1)

PATE-NT-A "z SPRUCH: Process to achieve soft-grip wool effects on acetate-cellulose webs with the known use of organic Acids, characterized in that -the organic acids in 8- to r5prozentiger Concentration sustained for a long time at boiling temperatures, with or without Salts, with or without protective colloids, or with salts and protective colloids together, lets act on acetyl cellulose webs.