DE561641C - Process for the production of cellulose lacquers and plastic masses - Google Patents

Description

Process for the production of cellulose lacquers and plastic masses The present invention relates to a method for producing cellulose lacquers and plastic compositions using chemically modified resins, which without this chemical change paints and plastic compositions based on cellulose not can be incorporated.

It is known that most natural resins, such as amber, Congo copal, Kauricopal, etc., do not combine homogeneously with cellulose derivatives can be processed into uniform masses.

It has now been found that the action products known per se from acids, acid arihydrides, acid chlorides, etc. to hydroxyl groups Natural resins combine with cellulose derivatives to form homogeneous masses or mixtures permit.

The invention is of particular importance for the incorporation of fossil or semi-fossil resins, e.g. B. Zanzibar copal, Congo copal, Kauricopal etc., which are known to be particularly resistant to chemical and atmospheric Are influences and communicate these properties to the products manufactured with them, so that plastic compounds and paints obtained from previously unknown properties will.

A particularly expedient embodiment of the invention consists in that the esterification of the hydroxyl-containing natural resins in solution and simultaneously and takes place together with the cellulose.

Another, particularly suitable for the production of cellulose lacquers Embodiment of the invention is that the esterification of natural resins takes place at the same time and together with the solvent or plasticizer, which will later form components of the finished paint. Example i i kg fine powdered and well dried Congo opal is in a known manner with 5 to io Parts of nitric acid of q.3 ° B6 (specific weight 1.425) treated in the cold, with a reaction takes place under heating and with the development of nitrous gases and the copal dissolves in the nitric acid to form a viscous mass. This mass is poured into ten times the amount of cold water while stirring and cooling, the reaction product separating out and settling on the bottom. It will be up to Disappearance of the acidic reaction is well washed out, and the resin mass is then in a solvent, e.g. B. ethyl acetate, dissolved and the solution separated from the water.

The resulting solution of the nitric acid ester of the Congo peach leaves deal with nitro or Acetyl cellulose or its solutions readily unite homogeneously.

Example e i kg of Congo opal and 0.5 kg of fine-fiber cellulose (cotton) are with 6 to 14 times the amount of concentrated nitric acid as in example i treated and then heated for about 2 hours at 40 to 50 ° C. The reaction product can be plasticized directly after thorough washing and careful drying (in a vacuum) Bulk or after dissolving in a solvent such as ethyl acetate, to a varnish are processed. Example 3 4okg of finely powdered and dried Manila.- or Kaurikopal are swollen or dissolved in about 4501 as absolute as possible ethyl alcohol. To this one adds goo kg of sulfuric acid of about 53 ° B6 (spec, weight 1.6) and about 7oo kg of anhydrous calcium acetate. The one with a stirrer, reflux condenser and steam jacket The mixture provided with the bubble is then stirred by indirect steam Boiled for 12 hours on the reflux condenser. Two layers are then obtained, one of which the lower one consists mainly of calcium sulfate and water, while the upper one Layer represents a solution of the ethyl-enriched copal in the ethyl acetate formed, which after washing with water and drying are plastic masses or varnishes based on cellulose can be added in any amount. Example 4 i, ikg finely powdered and dried amber or Zanzibar or Conga opal is mixed with 1 kg of cresol or Phenol and with i 2 kg of phosphorus pentachloride or r 5 kg of phosphorus oxychloride in known Way phosphorylated. After washing and drying the product. you get a solution of phosphorylated copal in cresyl or phenyl phosphate, which easily dissolves with Nitro or acetyl cellulose 'can be processed into homogeneous plastic masses or which, dissolved in a solvent, are added to cellulose ester varnishes can.

It is of course also possible to use resin (copal), Cellulose, plasticizers (cyclohexanol, amyl alcohol) and solvents (ethyl alcohol) to esterify together, e.g. B. to aoetyUeren, or the resin alone and to esterify independently of the other components in a known manner and the -esterified products then add to the cellulose ester.

Instead of the resins mentioned here, for example, any other resins and resin-like substances (rubber resins, types of rubber) are used, provided. they contain only hydroxyl groups. Instead of the example mentioned Nitric acid or acetic acid, the esterification can also take place with other acids.

Claims (3)

PATENT CLAIMS: i. Process for the production of cellulose lacquers and plastic masses, characterized in that these are known per se Products of the action of acids or of acid anhydrides containing hydroxyl groups Natural malts are added. 2. The method according to claim i, characterized in that that the addition takes place in such a way that the known esterification of the hydroxyl groups containing natural resins in solution and at the same time and together with the cellulose. 3. The method according to claim i and 2, in particular for the production of cellulose lacquers, characterized in that the esterification at the same time and together with the solvent and / or takes place with the plasticizer, which later components of the finished To form varnish.