DE642267C - Manufacture of sponge-like structures from viscose - Google Patents
Manufacture of sponge-like structures from viscoseInfo
- Publication number
- DE642267C DE642267C DEI53864D DEI0053864D DE642267C DE 642267 C DE642267 C DE 642267C DE I53864 D DEI53864 D DE I53864D DE I0053864 D DEI0053864 D DE I0053864D DE 642267 C DE642267 C DE 642267C
- Authority
- DE
- Germany
- Prior art keywords
- sponge
- viscose
- xanthate
- salt
- manufacture
- 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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
Bei der bisher üblichen Einverleibimg der Porenbildner in die Viskoseschwammassen war es notwendig, das als Porenbildner vierwendete Glaubersalz in kristallinischer Form anzuwenden, das in einem besonderen Kristallisationsprozeß hergestellt werden mußte und deshalb den Herstellungsprozeß .erschwerte und verteuerte.With the previously customary incorporation of the pore-forming agents into the viscose sponge masses it was necessary to use the Glauber's salt used as a pore-forming agent in crystalline form apply, which had to be produced in a special crystallization process and therefore made the manufacturing process difficult and expensive.
Es wurde nun gefunden, daß man zur Porenbildung gut passende Kristalle erhalten kann, wenn man in der Löselauge für das Gellulosexanthogenat ©der in dem Lösewasser für das Xanthogenat wasserfreies oder gewöhnliches, nicht regelmäßig geformtes Natriumsulfat auflöst und gut und gleichmäßig kristallisiertes Salz durch Abkühlen der Lösungen wieder zur Ausscheidung bringt. Bei Anwendung einer stärkeren Laugekonzentration kann auch Natriumbisulfat zur Bildung der Natriumsulfatkristalle mitverwendet werden. Die Salz gelöst enthaltenden oder mit Salzkristallen durchsetzten Lösungen können direkt zur Herstellung der Cellulosexanthogenatlösung verwendet ;und das aus der Lösung auskristallisierte Salz zur Porenbildung ausgenutzt werden. Es hat sich bei dieser Arbeitsweise gezeigt, daß die Gegenwart der Salzkristalle in der Lösung die Lösung des Cellulosexanthogenates nicht nur nicht erschwert, sondern sogar erheblich beschleunigt, weil die schleifende und reibende Wirkung der scharfen Kristalle die Verteilung des CeILulosexanthogenats begünstigt.It has now been found that crystals suitable for pore formation can be obtained if the anhydrous or ordinary, irregularly shaped sodium sulfate in the dissolving solution for the gellulose xanthate © is dissolved in the dissolving water for the xanthate and well and uniformly crystallized salt is dissolved by cooling the solutions back to excretion. If a higher concentration of caustic is used, sodium bisulphate can also be used to form the sodium sulphate crystals. The solutions containing dissolved salt or interspersed with salt crystals can be used directly for the preparation of the cellulose xanthate solution ; and the salt crystallized out of the solution can be used to form pores. It has been shown in this procedure that the presence of the salt crystals in the solution not only does not make the solution of the cellulose xanthate difficult, but even accelerates it considerably, because the grinding and rubbing action of the sharp crystals favors the distribution of the cellulose xanthate.
In den meisten Fällen wird nicht die Gesamtmenge des benötigten Salzes in der Löselauge 'und/oder dem Lösewasser gelöst werden können. Deshalb muß bei Herstellung von porenreichen Schwämmen ein noch notwendiger Rest des Salzes in passender Korngröße nachgesetzt werden.In most cases, not all of the salt needed will be in the solution 'and / or the dissolving water can be dissolved. Therefore, when producing pore-rich sponges a necessary remainder of the salt in the appropriate grain size be followed up.
19,25kg 24 Stunden lang gereifte Alkalicellulose mit einem Zellstoffgehalt von 31,3% und einem Alkaligehalt von 15,50/0 werden mit 3,6kg Schwefelkohlenstoff bei 23° 3 Stunden" lang sulfidiert. Zur Herstellung der Löselauge löst man 65 kg wasserfreies Natriumsulfat in 127,5kg 0,80/oiger Natronlauge unter Erwärmen auf und läßt das Salz durch Abkühlen auf —|— 50 bis '-j- io° unter Rühren auskristallisieren. In dem entstehenden Kristallbrei löst man das Xanthogenat auf und vermischt die Masse mit Ocker und Faserstoffen. Hierauf knetet man zur Erzielung größerer Poren noch insgesamt 168 kg grob kristallisiertes Glaubersalz hinein und gibt außerdem 40 kg wasserfreies Natriumsulfat zu. Die entstandene steife Masse wird Bei etwa 150 in die gewünschte Form gebracht19.25 kg of alkali cellulose matured for 24 hours with a pulp content of 31.3% and an alkali content of 15.50 / 0 are sulphided with 3.6 kg of carbon disulfide at 23 ° for 3 hours. 65 kg of anhydrous sodium sulphate are dissolved to produce the dissolving solution in 0.80 127,5kg / cent sodium hydroxide solution under heating, and the salt can be by cooling to - | - 5 0 to crystallize '-J- io ° with stirring in the resulting crystal is dissolved in the xanthate and mixed with the mass. Then ocher and fibers. kneads one larger to achieve a total of 168 kg of coarse pores still crystallized Glauber salt in it, and also outputs to 40 kg of anhydrous sodium sulfate. the resulting rigid mass is maintained at about 15 0 brought into the desired shape
*) Von dem Patentsucher sind als die Erfinder angegeben worden:*) The patent seeker indicated the following as the inventors: Dr. Paul Esselmann in Wolfen, Kr. Bitterfeld, und Dr. Hermann Hecht in Dessau.Dr. Paul Esselmann in Wolfen, Kr. Bitterfeld, and Dr. Hermann Hecht in Dessau.
und durch 4stündiges Erhitzen im geschlossenen Raum mit Dampf bei 150 bis i6o° koaguliert.and by heating for 4 hours in a closed room with steam at 150 to 160 ° coagulates.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEI53864D DE642267C (en) | 1935-12-13 | 1935-12-13 | Manufacture of sponge-like structures from viscose |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEI53864D DE642267C (en) | 1935-12-13 | 1935-12-13 | Manufacture of sponge-like structures from viscose |
Publications (1)
Publication Number | Publication Date |
---|---|
DE642267C true DE642267C (en) | 1937-02-27 |
Family
ID=7193715
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEI53864D Expired DE642267C (en) | 1935-12-13 | 1935-12-13 | Manufacture of sponge-like structures from viscose |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE642267C (en) |
-
1935
- 1935-12-13 DE DEI53864D patent/DE642267C/en not_active Expired
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