DE281876C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

-M 281876-CLASS 38 h. GROUP

of wood preservation.

Addendum to patent 281331.

Patented in the German Empire on September 11, 1913. Longest duration: October 19, 1927.

Patent 281331 had described in which way one determines the explosibility of nitro or polynitro bodies, which for antizymotic Purposes are used, cancel and these bodies can thus be shipped and traded can make.

It has now been found that this can also be done in such a way that the nitro or Pölynitro compounds, such as. B. dinitrophenol, picric acid, etc. or their salts, with Mixes phenols or their salts or dissolves them in whole or in part. So you get z. B. a product useful for antizymotic purposes, if dinitrophenol resp. Dinitrophenol salts mixed with cresols (e.g. cresol mixture) or by dissolving both bodies converted into alkali salts and brought into paste form. Through this procedure multiple effects are achieved. This not only increases the explosibility of the polynitro compound very extraordinarily reduced and even completely abolished by this procedure, but a further essential effect is also achieved. The cresole or their salts are known to already have antizymotic and preservative properties themselves Effect. As is well known, the impregnation of the wood is partly based on this Tar phenols and tar oils. However, this type of impregnation is not suitable for timber etc.

usable because in view of the relatively low antizymotic power of these Body too large concentrations of the impregnation liquid are required, as a result a permanent smell would then adhere to the wood. So z. B. a Brushing or impregnating with a thin sodium cresol solution does not have the effect like brushing or impregnating with a dinitrophenol sodium solution of same percentage. By combining both body groups it is now possible on the one hand to increase the antizymotic power of phenols so that little of this strong smelling body needs to be used, on the other hand, the presence of these phenols causes the polynitro compounds to do so Be deprived of explosibility.

Examples:

i. 5kg of 2 · 4-dinitrophenol are added with 2.5 kg Raw cresol mixture (so-called raw carbolic acid) stirred for a while. The dinitrophenol dissolves yellow-red color. Instead of raw cresol mixture, z. B. creosote, carbolineum commercially, etc., can be used as a disintegrant for dinitrophenol, etc.

The product of dinitrophenol and raw cresol mixture can be used directly for impregnation can be used, or it can be in the form of a

Claims (2)

dilute aqueous sodium hydroxide solution for painting or impregnating wood Find use. 2. 10 kg of free 2 · 4-dinitrophenol Stirred with 20 kg of raw cresol mixture and expediently 30 kg of sodium hydroxide solution with cooling 40 ° Be added slowly. The resulting product is a yellowish, even, non-settling paste that dissolves easily in water. Instead of the monosodium salts of the polynitrophenols and the phenols, products Find use that contain an excess of sodium hydroxide solution. Ρλ τ ε ν τ - A ν s ρ r u c η: Modification of the process according to patent 281331 for the production of non-explosive Preparations consisting in that instead of the lignosulfonic acid salts (sulfite pitch) here phenols or phenol salts or such products are used, which contain these bodies in substantial quantities.