CH139821A - Process for the coagulation of latex-like emulsions of artificial rubber. - Google Patents
Process for the coagulation of latex-like emulsions of artificial rubber.Info
- Publication number
- CH139821A CH139821A CH139821DA CH139821A CH 139821 A CH139821 A CH 139821A CH 139821D A CH139821D A CH 139821DA CH 139821 A CH139821 A CH 139821A
- Authority
- CH
- Switzerland
- Prior art keywords
- latex
- coagulation
- emulsions
- artificial rubber
- rubber
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C1/00—Treatment of rubber latex
- C08C1/14—Coagulation
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
Verfahren zur Koagulierung latexähnlicher Emulsionen von künstlichem Kautschuk. Es sind bereits mehrere Darstellungs methoden von künstlichem Kaiuts,chul" zum Patent angemeldet worden, bei welchem ,die Ausgan.gskohlenwasserstoTfe, wie Butadien (1.. 3), seine Homologen und Analogen, in einer wüsseri;gen Phase emulgiert und in,die- ser Emulsion polymerisiert werden.
Bei die sen Verfahren erhält man als Endprodukt Häufig eine latexährnliche Emulsion des künstlichen Kautschuks und ist darin ge zwungen, den Kautschuk durch Koagulation zu gewinnen.
Diese synthetischen Latices können zwar nach analogen Methoden wie die natürlichen Kautschukmilchsäfte koaguliert werden, zum Beispiel mit Säuren. Es wurde nun aber ge funden, dass man eine Trennung der emul- gierenden, wässerigen und der dispersen Kohlenwasserstoffphase nuch einfach da- ;
durch erreichen kann, da-ss man den syn- thetisGhen Latex einige Zeit auf Te@mpera- turen unter 0 .abkühlt. Nach dem Wieder auftauen kann mün dann die wässerige Schicht von dem Kautschukkoagulat schei den.
Dieses Verfahren hat den grossen Vorteil, ;dass es die Wiedergewinnung des Emulgatörs ,auf einfachste und billigste Weise ermög licht. Wird Latex vor dem Einfrieren nicht verdünnt, so kann :die wässerige, emulgator- haltige Schicht ohne weiteres zur Emulgie- rung und Polymerisation einer neuen Koh lenwasserstoffmenge Verwendung finden.
Ausserdem wird,die sonst benötigte Säure er spart, was um so mehr ins Gewicht fällt, als bei manchen synthetischen Latices erhebliche Säuremengen zur Koagulation erforderlich sind.
Dauer und Grad der Abkühlung können für jede Emuls.ionsart ,durch handwerks mässiges Ausprobieren rasch ermittelt wer den. <I>Beispiel</I> 100 Gewichtsteile Isapren werden in 50 Gewichtsteilen einer 10 % igen Nat.riumoleat- lösungdurch lebhaftes -Schütteln oder Rüh ren emulgiert. Die Emulsion wird unter schwacher Bewegung vier Tage aulf 60 er hitzt.
Der steife Rahm wird mit B00 Ge wichtsteilen Wasser zu einem Latex an gerührt, .der dann 11/2 Stunden auf -15 ge kühlt wird. Nach .dem Auftauen kann .die wässerige Oleatphase von @de@m Koa;gul.at leicht mechanisch getrennt werden.
<I>Beispiel 2:</I> 75 Gewichtsteile Isopren werden in 75 Gewichtsteilen .einer 10 % igen Natriumoleat- lösung durch starkes Rühren oder Schütteln emulgiert. Die Emulsion wird unter schwa- eher Bewegung zwei Tage jauf 60 erhitzt. Der erhaltene steife Rahm wird mehrere ,Stunden auf - 20 gekühlt. Nach,dem Auf tauen kann das @oagul,at durch Abpressen gewonnen werden.
Process for the coagulation of latex-like emulsions of artificial rubber. Patents have already been applied for several methods of preparing artificial kaiuts "chul" in which the starting hydrocarbons, such as butadiene (1 ... 3), its homologues and analogs, are emulsified in an aqueous phase and in the - This emulsion can be polymerized.
In these processes, the end product often obtained is a latex-like emulsion of the synthetic rubber, in which it is necessary to obtain the rubber by coagulation.
These synthetic latices can be coagulated by methods analogous to natural rubber milk juices, for example with acids. It has now been found, however, that a separation of the emulsifying, aqueous and the disperse hydrocarbon phase can simply be achieved;
can achieve that the synthetic latex is cooled down to temperatures below 0 for some time. After thawing again, the watery layer can then be separated from the rubber coagulate.
This process has the great advantage that it enables the recovery of the emulsifier in the simplest and cheapest way possible. If latex is not diluted before freezing, the aqueous, emulsifier-containing layer can easily be used for emulsifying and polymerizing a new amount of hydrocarbon.
In addition, it saves the acid that is otherwise required, which is all the more important as some synthetic latices require considerable amounts of acid for coagulation.
The duration and degree of cooling can be quickly determined for each type of emulsion by trial and error. <I> Example </I> 100 parts by weight of Isapren are emulsified in 50 parts by weight of a 10% sodium oleate solution by vigorous shaking or stirring. The emulsion is heated for four days with gentle agitation.
The stiff cream is stirred with B00 parts by weight of water to form a latex, which is then cooled to -15 hours for 11/2 hours. After thawing, the aqueous oleate phase can easily be separated mechanically from @ de @ m Koa; gul.at.
<I> Example 2 </I> 75 parts by weight of isoprene are emulsified in 75 parts by weight of a 10% sodium oleate solution by vigorous stirring or shaking. The emulsion is heated to 60 for two days with gentle agitation. The stiff cream obtained is cooled to -20 for several hours. After thawing, the @ oagul, at can be obtained by pressing.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEI33235D DE537032C (en) | 1928-01-16 | 1928-01-16 | Process for the coagulation of latex-like emulsions of rubber-like polymerization products of butadiene hydrocarbons |
Publications (1)
Publication Number | Publication Date |
---|---|
CH139821A true CH139821A (en) | 1930-05-15 |
Family
ID=7188361
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH139821D CH139821A (en) | 1928-01-16 | 1929-01-15 | Process for the coagulation of latex-like emulsions of artificial rubber. |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH139821A (en) |
DE (1) | DE537032C (en) |
NL (1) | NL44512B (en) |
-
1928
- 1928-01-16 DE DEI33235D patent/DE537032C/en not_active Expired
-
1929
- 1929-01-15 NL NL44512A patent/NL44512B/xx unknown
- 1929-01-15 CH CH139821D patent/CH139821A/en unknown
Also Published As
Publication number | Publication date |
---|---|
NL44512B (en) | 1930-12-15 |
DE537032C (en) | 1931-10-29 |
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