DE750299C - Process for the production of wool-like synthetic fibers from cellulose solutions - Google Patents

Description

Process for the production of wool-like synthetic fibers from cellulose solutions With the usual manufacturing processes of rayon, which in their final state consist of regenerated @ cellulose, e.g. copper or viscose silk, The drying processes are of particular importance because the freshly spun Material here still suffers significant changes, both in the physical as well as in the coloring properties are clearly expressed. So owns For example, a copper silk that has not yet dried has an extraordinarily high level Substantivity which in itself has a deep coloring even at low temperatures: g would allow. However, this coloring capacity changes as a result of the usual drying processes using more or less high drying temperatures is very important. It is therefore the case that uneven drying processes result in inconsistent drying processes Staining result. Another disadvantage of the previous drying processes consists in it. that it cannot be done without assistance in simply drying the rayon of textile auxiliaries is possible, directly to a soft, usable product to get.

It has now been found that one can produce wool-like fibers from cellulose solutions obtained when one of the still wet synthetic copper fiber or synthetic viscose fiber, which is related to their dyeability corresponds to the synthetic copper fiber instead of the usual drying processes to subjugate, by using water-displacing agents, in particular by removes organic liquids, water up to about 10 ° / ß. The used organic liquids are advantageously chosen so that their recovery technically easy to carry out. It should be emphasized that the drying process is expediently carried out only so far that in the end one immediately Artificial silk is obtained, which still contains the so-called molecular water, which is normally found in all merchandise.

Due to this fact and the use of a regenerated Cellul.ose of markedly high substantivity differs from the present one Method basically differs from the method of American patent specification i 651 404, corresponding to viscose, which is the low grade generally customary for viscose of substantivity, with hot alcoholic liquids, preferably with Alkoliolclampf, i.e. at elevated temperature, up to the imperial dehydration treated and thereby a viscose is obtained, which otherwise for an iViscose usual EJ-4nschaft due to a special increased gloss and increased elasticity is excellent.

The essence of the present process is that one the treatment of the fiber with the water-displacing agents with wet. not yet dried material instead of the usual drying processes, whereby only the effects mentioned and the economy of the process for Come into play.

L m the listed particularly favorable properties as well as in technical The elongation and strength values are within reasonable limits, especially a favorable one to obtain elastic elongation. it is appropriate to the present procedure at relatively low temperatures, especially at room temperature.

It is true that methods are known to date for drying rayon with the help of vasserentzielien: ler means (French patents Ni r.369o37 and 662 3i, #). The finished rayon is then treated with solvent vapors at an elevated temperature and thus also removed (the last so-called molecular water. This relatively rough treatment is intended to increase the dimensional stability of the material.

In contrast to all previous drying processes that have a closed Provide thread-like rayon, is obtained according to the invention without any further aftertreatment Products of a fibrous character, the smooth luster, extraordinary softness and have a pronounced warming effect. They are also characterized by a ruffled voluminous exterior, which comes very close to that of wool. In your As a whole, the fiber obtained in this way must be special as a textile material Art addressed with completely new properties.

The great technical progress is not just there. that he new material has particularly good properties, but it is also based thereon. that in this process a number of cumbersome processes in the previous one Working method, such as B. washing, soaps, etc., can be saved, and finally on the fact that certain additives, preparations, finishes, etc. can achieve special effects directly.

The effect of the present method appears to be essentially on this to be based that the water contained in the fiber in a ni1iNer way without Destruction, sticking or other damage to the surface and thus the mechanical Consistency removed, so that the original structure of the fiber is retained remain. As a result, it is possible by the present process fibers from obtain particularly favorable elasticity. 'Example I' Freshly Spun, Good Copper silk that has been decoppered and deacidified is immediately after centrifuging or Squeeze with a sufficient amount of alcohol, for example by soaking in 9% alcohol, brought into contact, then removed from the alcohol bath, if necessary centrifuged and the remaining alcohol by post-treatment with z. B. Carbon tetrachloride or ether removed. Then the product of the last will be applied solvent freed by evaporation with recovery of the same. In this way a fiber is obtained with the properties indicated above.

It can be done in an analogous manner, individually or in combinations, at the same time or one after the other, including all liquids suitable for displacing water those which contain larger or smaller amounts of water. Find application.

The present process is equally successful in the continuous Spinning process can be used accordingly.

Example e Wet copper silk in the same processing condition as in example i, acetone and carbon tetrachloride are treated in succession. The solvents can be finitely advantageous successively or in a countercurrent process can be applied. The last portion of solvent can be suitable Treatment agents to achieve special effects, such as sizing agents, impregnation agents and other preparations.

In a corresponding modification, in the same way in the individual or continuous process products with similar favorable properties from viscose produce, if one uses products, which regarding their dyeability of the copper rayon correspond.

Example 3 A freshly spun: cellulose tape, for example copper silk, which consists of a large number of individual capillary threads becomes after. Going through the corresponding , the cold or hot treatment baths directly by pressing, spinning or squeezing off or the like, initially mechanically freed of water and placed in a bath with a low alcohol content, for example 3o0 / 0, guided. From this bath the fiber bundle is transferred to further baths of increasing alcohol concentration out, which are optionally connected to one another by overflow, with between the individual baths switched on further nip rollers or stripping devices could be. After leaving the bath with the highest alcohol concentration desired mechanical removal of the alcohol as far as possible is advantageous brought about so that only a small proportion of the alcohol used for evaporation comes. The material obtained in this way is reeled up in the usual way and shows particularly favorable properties due to the fact that the low concentration too sudden shrinkage is avoided after the first alcohol bath.

Claims (1)

PATENT CLAIM: Process for the production of woolly synthetic fibers äus cellulose solutions: characterized in that the still wet synthetic copper fiber or viscose synthetic fiber, which corresponds to the dyeable color of the synthetic copper fiber, instead of subjecting it to the usual drying processes, by using water-displacing agents, namely removes organic liquids, water up to about 10%. To distinguish the subject of the application from the state of the art, the following publications were taken into account in the granting procedure: German patent specification ..... N o. 134312; French patents - 369957, 66a 515, 7 22 4 67: Austrian patent specification - 112 977; Swiss - - 155 795 U.S. Patent ....... - 1 651 4o4.