DEP0056061DA - Process for maturing viscose solutions. - Google Patents
Process for maturing viscose solutions.Info
- Publication number
- DEP0056061DA DEP0056061DA DEP0056061DA DE P0056061D A DEP0056061D A DE P0056061DA DE P0056061D A DEP0056061D A DE P0056061DA
- Authority
- DE
- Germany
- Prior art keywords
- maturing
- viscose solutions
- cellulose
- xanthate
- carried out
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims description 6
- 229920000297 Rayon Polymers 0.000 title claims description 4
- 229920002678 cellulose Polymers 0.000 claims description 9
- 239000001913 cellulose Substances 0.000 claims description 9
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 claims description 8
- 239000012991 xanthate Substances 0.000 claims description 7
- 230000032683 aging Effects 0.000 claims description 2
- 238000000527 sonication Methods 0.000 claims description 2
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000005070 ripening Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
Lässt man auf Alkalicellulose Schwefelkohlenstoff einwirken, so bildet sich Cellulose-Xanthogenat. Dieses Cellulose-Xanthogenat ist, wenn es frisch hergestellt ist, in Wasser kolloidal löslich. Solange dieser Ester noch diese Eigenschaften besitzt, lässt er sich nicht zu Cellulosefäden in einem Fällbad spinnen. Um ein verspinnbares Cellulose-Xanthogenat zu erhalten,muss man den frisch bereiteten Ester längere Zeit lagern und reifen. Bei dieser Reifung zersetzt er sich unter partieller Abspaltung des Xanthogenatrestes und Zurückbildung der Cellulose. Parallel zur Reife steigt die Viscosität an. Bei der Lagerung der immerhin großen Chargen ist es schwer, den Spinndüsen stets ein Produkt gleicher Viscosität zuzuführen. Es bedarf einer umfangreichen Apparatur, um ein gleichmäßiges Fertigprodukt zu erzielen.If carbon disulfide is allowed to act on alkali cellulose, cellulose xanthate is formed. This cellulose xanthate, when freshly prepared, is colloidally soluble in water. As long as this ester still has these properties, it cannot be spun into cellulose threads in a precipitation bath. In order to obtain a spinnable cellulose xanthate, the freshly prepared ester has to be stored and matured for a long time. During this ripening process, it decomposes with partial splitting off of the xanthate residue and regression of the cellulose. The viscosity increases in parallel with maturity. When storing large batches, it is difficult to always supply a product of the same viscosity to the spinnerets. Extensive equipment is required to achieve a uniform finished product.
Die Erfindung beseitigt diese Nachteile und besteht darin, dass die Alterung des Cellulose-Xanthogenates in einem Ultraschallfeld durchgeführt wird.The invention eliminates these disadvantages and consists in that the aging of the cellulose xanthate is carried out in an ultrasonic field.
Die Apparatur ist derart gestaltet, dass die frische oder teilweise gealterte Cellulose-Xanthogenatlösung zweckmäßig im Durchlaufverfahren einem Ultraschallfeld ausgesetzt wird, wodurch die partielle Abspaltung des Xanthogenates stattfindet. Werden nur kleine Chargen versponnen, so lässt sich auch die gesamte Charge zu gleicher Zeit einem Schallfeld aussetzen, wobei die Beschallung in einer Kreislaufanordnung durchgeführt werden kann. Die so hergestellte Viscose ist ein Produkt weitgehender Gleichmäßigkeit und Viscosität. Man ist so in der lage, die Spinndüsen stets mit gleichem Druck zu belasten und erhält dadurch Produkte guter Qualität.The apparatus is designed in such a way that the fresh or partially aged cellulose xanthate solution is expediently exposed to an ultrasound field in a continuous process, as a result of which the xanthate is partially split off. If only small batches are spun, the entire batch can also be exposed to a sound field at the same time, and the sonication can be carried out in a circuit arrangement. The viscose produced in this way is a product of extensive uniformity and viscosity. In this way, you are able to always load the spinnerets with the same pressure and thus obtain products of good quality.
Claims (3)
Family
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