AT101836B - Coagulating bath for viscose silk. - Google Patents

Coagulating bath for viscose silk.

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Publication number
AT101836B
AT101836B AT101836DA AT101836B AT 101836 B AT101836 B AT 101836B AT 101836D A AT101836D A AT 101836DA AT 101836 B AT101836 B AT 101836B
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AT
Austria
Prior art keywords
coagulating bath
formic acid
viscose
viscose silk
thread
Prior art date
Application number
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German (de)
Original Assignee
Soie Artificielle De Tubize Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Soie Artificielle De Tubize Sa filed Critical Soie Artificielle De Tubize Sa
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Publication of AT101836B publication Critical patent/AT101836B/en

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Description

  

   <Desc/Clms Page number 1> 
 



    Eoagulierbad   für Viskoseseide. 



   Die vorliegende Erfindung betrifft ein Koagulierungsbad, das bei der Herstellung von künstlicher Seide aus Viskose benutzt werden soll. 



   Die Erfindung bezweckt die Erzielung eines Fadens aus Zellulosexanthogenat, der sich leichter ausziehen lässt als dies bisher der Fall war, von feinstem Denier und sehl elastisch ist und hohen Glanz aufweist. 



   Dies wird durch die   Benutzung eines Koagulierbades erreicht,   das im wesentlichen aus ameisensaurem Ammonium und ameisensaurem Natrium besteht. Das Ammoniumsalz wird in der geringsten, zur Neutralisation des freien Ätznatrons erforderlichen Menge verwendet, ebenso das Natronsalz in einer Konzentration, die zur Erreichung der Koagulierung eben genügt. Im allgemeinen haben sich folgende   Mengenverhältnisse   als brauchbar erwiesen :
13 bis 15% ameisensaures Ammonium,
13 bis   18%   ameisensaures Natrium. 



   Mit einer solchen Lösung erhält man einen transparenten Faden von hellgelbem Aussehen, der sich leicht ausziehen lässt und einen Ausziehnngskoeffizienten von   980 besitzt.   



   Die weitere Behandlung des Fadens, nämlich die Zersetzung der Viskose in Zellulose, kann auf beliebige Art, z. B. durch eine Säure oder eine saure Mischung schwacher Konzentration, bewirkt werden. 



  Die Zersetzung soll jedoch auf jeden Fall schnell vonstatten gehen, um ein etwaiges Kleben zu vermeiden. 



   Es ist bekannt, Ameisensäure allein oder Ameisensäure neben einer Salzlösung als Fällungsmittel 
 EMI1.1 
 Natron bildet. Der Unterschied gegenüber der Erfindung besteht darin, dass bei dieser die ameisensauren Salze nur die Koagulierung des Xanthatfadens bewirken, während dessen Umwandlung in Zellulose, wie früher angegeben, durch andere bekannte Mittel erreicht wird. Das Koagulierbad gemäss der Erfindung ruft eine ganz geringe Koagulierung des Fadens hervor und verhindert jede Zersetzung, damit der Faden bis zu einem   Maximum streckbar ist und schliesslich   ein Faden von möglichst niedrigem Denier erzielt werden kann.

   Diese Aufgaben erfüllt ein Bad nur dann, wenn die Konzentration des ameisensauren Ammoniums eben ausreicht, das freie Natron der Vi kose zu neutralisieren und wenn das ameisenasure Natron nur in der geringsten, zur Herbeiführung der   Koagulierung   eben ausreichenden Menge vorhanden ist. 

**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.



   <Desc / Clms Page number 1>
 



    Eoagulating bath for viscose silk.



   The present invention relates to a coagulating bath to be used in the manufacture of artificial silk from viscose.



   The invention aims to achieve a thread made of cellulose xanthogenate, which can be pulled out more easily than has hitherto been the case, of the finest denier and which is elastic and has a high gloss.



   This is achieved by using a coagulating bath consisting essentially of ammonium form and sodium form. The ammonium salt is used in the smallest amount required to neutralize the free caustic soda, as is the sodium salt in a concentration which is sufficient to achieve coagulation. In general, the following proportions have proven to be useful:
13 to 15% formic acid ammonium,
13 to 18% sodium formate.



   With such a solution, a transparent thread with a light yellow appearance is obtained, which is easy to pull out and has a pull-out coefficient of 980.



   The further treatment of the thread, namely the decomposition of the viscose into cellulose, can be done in any way, e.g. B. by an acid or an acidic mixture of weak concentration.



  In any case, the decomposition should take place quickly in order to avoid any sticking.



   It is known to use formic acid alone or formic acid in addition to a salt solution as a precipitant
 EMI1.1
 Soda forms. The difference from the invention is that in this the formic acid salts only coagulate the xanthate thread, while its conversion to cellulose, as indicated earlier, is achieved by other known means. The coagulating bath according to the invention causes very little coagulation of the thread and prevents any decomposition so that the thread can be stretched to a maximum and finally a thread of the lowest possible denier can be achieved.

   A bath only fulfills these tasks if the concentration of the formic acid ammonium is sufficient to neutralize the free soda in the vase and if the formic acid soda is only available in the smallest amount sufficient to induce coagulation.

** WARNING ** End of DESC field may overlap beginning of CLMS **.

 

Claims (1)

PATENT-ANSPRUCH : Koagulierbad für Viskoseseide, dadurch gekennzeichnet, dass es aus einer Lösung von ameisensaurem Ammonium, das in einer zur Neutralisation des freien Natriums in der Viskose gerade ausreichenden Konzentration (13 bis 15%) verwendet wird, sowie aus ameisensaurem Natrium besteht, das ebenfalls in der geringsten (13 bis 18%) zur Koagulierung erforderlichen Konzentration zur Verwendung gelangt. **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: Coagulating bath for viscose silk, characterized in that it consists of a solution of formic acid ammonium, which is used in a concentration just sufficient to neutralize the free sodium in the viscose (13 to 15%), and of formic acid sodium, which is also the lowest (13 to 18%) concentration required for coagulation is used. ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT101836D 1922-01-21 1923-01-20 Coagulating bath for viscose silk. AT101836B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE101836X 1922-01-21

Publications (1)

Publication Number Publication Date
AT101836B true AT101836B (en) 1925-11-25

Family

ID=5649072

Family Applications (1)

Application Number Title Priority Date Filing Date
AT101836D AT101836B (en) 1922-01-21 1923-01-20 Coagulating bath for viscose silk.

Country Status (1)

Country Link
AT (1) AT101836B (en)

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