DE732202C - Process to increase the fire safety of nitrocellulose films - Google Patents

Process to increase the fire safety of nitrocellulose films

Info

Publication number
DE732202C
DE732202C DER108465D DER0108465D DE732202C DE 732202 C DE732202 C DE 732202C DE R108465 D DER108465 D DE R108465D DE R0108465 D DER0108465 D DE R0108465D DE 732202 C DE732202 C DE 732202C
Authority
DE
Germany
Prior art keywords
increase
fire safety
nitrocellulose
acetone
films
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
Application number
DER108465D
Other languages
German (de)
Inventor
Gerhard Rolf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DER108465D priority Critical patent/DE732202C/en
Application granted granted Critical
Publication of DE732202C publication Critical patent/DE732202C/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03CPHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C11/00Auxiliary processes in photography
    • G03C11/06Smoothing; Renovating; Roughening; Matting; Cleaning; Lubricating; Flame-retardant treatments

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fireproofing Substances (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Paints Or Removers (AREA)

Description

Verfahren zur Erhöhung der Feuersicherheit von Nitrocellulosefilmen Zusatz zum Patent 714 884 Im Patent 714884 ist ein Verfahren zurr Erhöhung, der Feuersicherheit von NitrocellulosefiÜmen beschrieben worden, das darin besteht, die entwickelten Filme durch ein dünnflüssiges Bad von optisch klaren Gelati@neabbauproduh-ten, gewonnen ,aus Gelatine durch Zusatz von Säuren und Zugabe vorn Kunststoffen in alkoholischer Lösung unter weiterer Hinzufügu%- von feuerhemmenden Stoffen, hindun chzu@führen. Die Filme werden nach dem Durchlauf durch Abpressen und Trocknen fertiggestellt. Versuche haben ,gezeigt, d.aß die der verfahrensgemäß: verwendeten Mischung eigentümliche Selbsthärtung durch eine anschließende Fremdhärtung in einem Bad mit Formaldehyd wirksam ergänzt werden kann, so daß in wesentlich kürzerer Zeit eine vollständige Trocknung erreicht wird.Process for increasing the fire safety of nitrocellulose films Addendum to Patent 714 884 Patent 714884 describes a method for increasing the Fire safety of nitrocellulose films has been described, which consists in the developed films through a thin liquid bath of optically clear gelatin degradation products, Obtained from gelatin by adding acids and adding plastics in alcoholic Solution with further addition of fire retardants, hindun chzu @ lead. After passing through, the films are finished by pressing and drying. Experiments have shown that the mixture used is peculiar to the process Self-hardening through subsequent external hardening in a bath with formaldehyde can be effectively supplemented, so that a complete one in a much shorter time Drying is achieved.

Eine gegenüber dieser Fremdhärtung noch wesentlich verbesserte Härtung wird jedoch erreicht, wenn man die selbsthärtenden Eigenschaften des Bades durch erhöhten Aceton-. zusatz sowie durch Hinztifü-cn von Celluloseverbindungen verstärkt.A hardening that is still significantly improved compared to this external hardening is achieved, however, if you take the self-curing properties of the bath through increased acetone. addition and strengthened by the addition of cellulose compounds.

Während nach dem Hauptpatent Üblicherweise, i o ccm = 8 g = : 2,5 Gewichtsprozunt Aceton, bezogen auf 6o ,g Gelatine, verwendet werden, sieht die Ztisatzerfi.n:dtnng die doppelte Acetonmenge, nämlich 25 Gewichtsprozent, bezogen auf 6o,- Glutin, vor und aul'')erdem geringe Mengen vorn Cel_ulaseverbindungen, wie z. B. Nitro:-, Aoetyl-, Methyl- oder Benzylcellulose. Die- Verwendung von diesem a5gewichtsprozentigen Acetonzusatz ist gleichzeitig die untere Grenze für die vervendet:e Acetonmenge. Dieses Verfahren bat nicht nur eine w -esentliche Verkürzung der Trocknungszeit zur Folge, sondern die Schicht wird zwangsläufig auch in tieferen Zonen zuverlässig durchgehärtet. Die Oberflächenhärte der Schicht steigt beträchtlich. Zur Ausführung der Erfindung kann beispielsweise ein Bad der folgenden Zusammensetzung dienen: 6o2- Gelatine, durch Wärmebehandlung mit Ameisensäure, Pho,sphoirsäure oder Essigsäure alkohollöslich gemacht, 9o ccm Äthylalkohol, 2o ccm Aceton, 6- Nitro,eellulose, bekannte Weichmacher, feuerhemmende Stoffe wie im Hauptpatent.While, according to the main patent Typically, io cc = g = 8: are used 2.5 Gewichtsprozunt acetone, based on 6o, g gelatin, sees the Ztisatzerfi.n: dtnng twice the amount of acetone, namely 25 percent by weight, based on 6o, - Glutin , before and aul '') erdem small amounts of Cel_ulaseverbindungen such. B. Nitro: -, aoetyl, methyl or benzyl cellulose. The use of this a5 weight percent acetone additive is at the same time the lower limit for the amount of acetone used. This process not only resulted in a substantial reduction in the drying time, but the layer is inevitably reliably hardened even in deeper zones. The surface hardness of the layer increases considerably. To carry out the invention, for example, a bath of the following composition can be used: 6o2 gelatin, made alcohol-soluble by heat treatment with formic acid, phophosphoric acid or acetic acid, 90 cc ethyl alcohol, 20 cc acetone, 6- nitro, cellulose, known plasticizers, fire-retardant substances such as in the main patent.

Der verwendete Nitrocellulos:ezuschlagerhöht den Nitrocelluloseanteil des beschichteten Films nur um etwa 20.'0. Dieser Zusatz spielt daher für die Zündempfindlichkeit keine Rolle, zumal diese infolge der übrigen Zusätze ganz erheblich sinkt.The nitrocellulose used: increases the nitrocellulose content of the coated film only at about 20.'0. This addition therefore plays a role in the ignition sensitivity does not matter, especially since this drops quite considerably as a result of the other additives.

Claims (1)

PATENTANSPRUCH: Verfahren zur Erhöhung der Feuersicherheit von Nitro@cellu:lose-fihn-en nach Patent 7r¢ 884., dadurch gekennze:ich,net, daß dem Bad mindestens 25 Gewichtsprozent Aceton, berechnet auf die Gelatineabbauprodukte, sowie in geringen Mengen Cellulosederivate zugefügt werden.PATENT CLAIM: Process to increase the fire safety of Nitro @ cellu: lose-fihn-en according to patent 7r ¢ 884., characterized by the fact that at least 25 percent by weight of acetone, calculated on the gelatin breakdown products, and small amounts of cellulose derivatives are added to the bath will.
DER108465D 1940-10-08 1940-10-08 Process to increase the fire safety of nitrocellulose films Expired DE732202C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DER108465D DE732202C (en) 1940-10-08 1940-10-08 Process to increase the fire safety of nitrocellulose films

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER108465D DE732202C (en) 1940-10-08 1940-10-08 Process to increase the fire safety of nitrocellulose films

Publications (1)

Publication Number Publication Date
DE732202C true DE732202C (en) 1943-02-24

Family

ID=7421629

Family Applications (1)

Application Number Title Priority Date Filing Date
DER108465D Expired DE732202C (en) 1940-10-08 1940-10-08 Process to increase the fire safety of nitrocellulose films

Country Status (1)

Country Link
DE (1) DE732202C (en)

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