DE837773C - Process for the production of rubber or rubber derivatives of reduced viscosity - Google Patents
Process for the production of rubber or rubber derivatives of reduced viscosityInfo
- Publication number
- DE837773C DE837773C DEF2376A DEF0002376A DE837773C DE 837773 C DE837773 C DE 837773C DE F2376 A DEF2376 A DE F2376A DE F0002376 A DEF0002376 A DE F0002376A DE 837773 C DE837773 C DE 837773C
- Authority
- DE
- Germany
- Prior art keywords
- rubber
- production
- derivatives
- chlorine dioxide
- reduced viscosity
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/08—Depolymerisation
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)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
Verfahren zur Herstellung von Kautschuk oder Kautschukderivaten verringerter Viskosität 1#.s ist bekannt, die Viskosität von Kautschuklösungen durch Einwirkung geringer Mengen chemisch aktiver Stoffe (z.13. Halogene, Ozon, E-Iypoehlorit) zu verringern, wodurch die Anwendung höher konzentrierter Kautschuklösungen ertniiglichtwird, was beispielsweise zu einer Ersparnis an Lösungsmitteln führt. .lußerdem wird in vielen 1,' älleti auch die Viskosität der aus Gien vorbehandelten Kautschuklösungen gewinnbaren Kautschukderivate, beispielsweise von Chlorkautschuk, ebenfalls herabgesetzt, so daß auf diesem Wege bei der Lackherstellung mehr Festkörper eingearbeitet werden kann. Erfindungsgemäß wird der Kautschuk oder dessen Derivate, vorzugsweise in gelöster Form, der Einwirkung geringer Mengen Chlordioxyds unterworfen. Gemäß einer bevorzugten .lusführungsform wird eine Lösung des Chlordioxyds in einem Kautschuklösungsmittel verwendet. Das Chlordioxyd kann aber auch in Gasform, z. B. verdünnt mit Kohlensäure, in die Reaktionslösung eingeleitet werden. Das Verfahren gemäß der Erfindung zeichnet sich durch seine Einfachheit aus und ermöglicht es bei sehr kurzer Einwirkungszeit auch weiterhin unter Ausschluß von Wasser zu arbeiten. Das Arbeiten in homogener, flüssiger Phase gestattet ferner eine sichere und gehaue Dosierung des Chlordioxyds bzw. Einstellung der gewiinschten Viskosität. Die Einwirkung des Chlordioxyds erfolgt schon bei Zimmertemperatur. Die Behandlung mit Chlordioxyd kann z. 13. bei der Herstellung von Kautschukhydrochlorid, während oder nach der Chlorwasserstoffhehandlung vorgenommen werden. Als weiteres Beispiel sei die Anwendung bei der Herstellung von Chlorkautschuk angeführt. Aus den mit Chlordioxyd behandelten Kautschuklösungen lassen sich ohne weiteres helle Chlorkautschuke handelsüblichen Chlorgehaltes herstellen.Process for the production of rubber or rubber derivatives reduced Viscosity 1 # .s is known, the viscosity of rubber solutions through action small amounts of chemically active substances (e.g. halogens, ozone, hypophosphorous) reduce, whereby the use of more concentrated rubber solutions is made necessary, which leads, for example, to a saving in solvents. In addition, the many 1, alleti also the viscosity of the rubber solutions pretreated from Gien recoverable rubber derivatives, for example chlorinated rubber, also reduced, so that more solids are incorporated in the paint production in this way can. According to the invention, the rubber or its derivatives are preferably dissolved Form subject to the action of small amounts of chlorine dioxide. According to a preferred The embodiment is a solution of chlorine dioxide in a rubber solvent used. The chlorine dioxide can also be in gaseous form, e.g. B. diluted with carbonic acid, are introduced into the reaction solution. The method according to the invention draws is characterized by its simplicity and enables it with a very short exposure time continue to work with the exclusion of water. Working in a homogeneous, liquid phase also allows a safe and hewn dosage of chlorine dioxide or setting the desired viscosity. The action of the Chlorine dioxide takes place at room temperature. Treatment with chlorine dioxide can e.g. 13. in the production of rubber hydrochloride, during or after Hydrogen chloride treatment can be carried out. Another example is the application listed in the production of chlorinated rubber. From those treated with chlorine dioxide Rubber solutions can easily be made of light-colored chlorinated rubbers Produce chlorine content.
Ausfülirungsbeisl>iel Eine Lösung von 2 g Kautschuk in iooccmTetrachlorkohlenstoff zeigte eine Viskosität entsprechend der Durchlaufzeit von 123 Sek., gemessen im Fordtopf mit der Düse 40. Nach Zusatz von 0,002 g Chlordioxyd, in Tetrachlorkohlenstoff gelöst, zu 130 ccm der obigen Lösung war die Durchlaufzeit nach '/2 Stunde Einwirkungsdauer auf 15 Sek. gesunken.Execution example A solution of 2 g of rubber in carbon tetrachloride had a viscosity corresponding to the flow time of 123 seconds, measured in a Ford pot with the nozzle 40. After adding 0.002 g of chlorine dioxide, dissolved in carbon tetrachloride, the flow time was 130 ccm of the above solution decreased to 15 seconds after 1/2 hour exposure.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEF2376A DE837773C (en) | 1942-07-05 | 1942-07-05 | Process for the production of rubber or rubber derivatives of reduced viscosity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEF2376A DE837773C (en) | 1942-07-05 | 1942-07-05 | Process for the production of rubber or rubber derivatives of reduced viscosity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE837773C true DE837773C (en) | 1952-05-02 |
Family
ID=7083250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEF2376A Expired DE837773C (en) | 1942-07-05 | 1942-07-05 | Process for the production of rubber or rubber derivatives of reduced viscosity |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE837773C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1128641B (en) * | 1955-06-27 | 1962-04-26 | Hercules Powder Co Ltd | Process for the production of chlorinated rubber |
-
1942
- 1942-07-05 DE DEF2376A patent/DE837773C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1128641B (en) * | 1955-06-27 | 1962-04-26 | Hercules Powder Co Ltd | Process for the production of chlorinated rubber |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE1220969B (en) | Process for improving structurally damaged hair | |
| DE837773C (en) | Process for the production of rubber or rubber derivatives of reduced viscosity | |
| DE1086665B (en) | Process to reduce the escape of chlorine dioxide from acidic chlorite baths or chlorine dioxide solutions | |
| DE660409C (en) | Process for the production of protective layers on magnesium and its alloys | |
| DE531006C (en) | Process for the preparation of completely soluble wooden ethers | |
| DE905777C (en) | Process for carrying out chemical reactions using chlorites | |
| DE821484C (en) | Process for dechlorinating natural celluloses bleached with chlorine compounds, regenerated cellulose or cellulose decoctions | |
| DE486075C (en) | Method for improving the adsorption capacity of active charcoal | |
| DE898350C (en) | Process for the production of tanning agents from sulphite waste liquor and lignin extracts | |
| DE607865C (en) | Process for the sterilization and bleaching of cereals and grains | |
| AT135339B (en) | Method of waterproofing wool fibers. | |
| DE612172C (en) | Process for impregnating fur skins against moths and similar pests | |
| DE2161046C3 (en) | Process for producing a salt paste for binding dust in mining | |
| DE712636C (en) | Process for passivating stainless steel | |
| DE2056060C3 (en) | Salt paste for binding dust in mining | |
| DE812114C (en) | Sponge repellants | |
| DE728223C (en) | Process for the production of organic sulfur compounds | |
| AT152284B (en) | Method for preparing fur or the like for felting. | |
| DE480352C (en) | Process for accelerating the development processes of photographic and tracing papers by means of gases or vapors | |
| DE767052C (en) | Process for the production of pure hydrogen peroxide | |
| DE595849C (en) | Process for impregnating fur skins with protective agents against moths and similar pests | |
| DE745410C (en) | Process for bleaching synthetic or natural fibers on perforated carriers | |
| DE512599C (en) | Process for treating latex or latex concentrates | |
| DE348136C (en) | Method of stabilizing nitrocellulose | |
| DE974908C (en) | Process for bleaching polyacrylonitrile fibers |