SU12096A1 - A method of manufacturing products from condensation products of phenols with aldehydes - Google Patents

Description

Patent No. 5027 describes a method for the manufacture of products from products of phenols with aldehydes in the presence of acids as catalysts, which states that these products of "condensation in the presence of organic sulfonic acids are subjected to cold pressing or rolling in mixture with organic or mineral powders after which the resulting products are fixed by heating or other well-known techniques.

The proposed method is a technique for performing the method described in the above patent, and consists in using powdered impregnated products capable of being compressed by heating or btg; in this process, the formation of the binder material takes place in the presence of acidic catalysts in the substance itself, or a varnish with an acidic catalyst is preliminarily prepared, and the powdered filling substance is soaked in solutions of such a varnish. The impregnation of the powder itself is not done by simply mixing the solid filler with a lacquer solution, or a mixture of phenol and formalin, but by pulvering under pressure onto the surface of a powdered filler of a mixture of fe "ol with formalin, or a lacquer solution, while stirring the mass and heating not more than 60 ° C; all the while, water and other volatile products are removed. With the help of spraying, deep pressure is impregnated under pressure on the surface of cellulose powder of a mixture of phenol and formalin, and continuous mixing makes it possible to impregnate the whole mass evenly. At a temperature of 40-60 ° C, with stirring, due to the evaporation of water, conditions are created that are favorable for obtaining from the phenol and formalin the initial condensation product, which has binding properties and at the same time with the above

The conditions do not pass either into the final product or into the intermediate product. When using raw materials in a powdered state, it is a complete opportunity to directly obtain powders that can be pressed into certain objects not only on hot presses, but also on cold ones without first grinding the impregnated mass in special mills, which is of great importance when using acidic mills. catalysts, since friction in the mill leads to strong heating and a non-meltable and insoluble condensation product may prematurely form.

Example: 80 parts of wood flour in a special apparatus, when heated to C, are sprayed under pressure with a mixture of cresol and formalin in the presence of benzene-sulfonic acid. The relationship between cresol, formalin and benzene-sulfonic acid is 9: 9: 2. Impregnation is done.

gradually, its end is recognized by practical breakdown in the press. For 80 parts, wood flour is 90 parts of cresol and 90 parts of 40 / o formalin. In some cases, it is considered rational to combine impregnation with cresol and formalin with the final impregnation with varnish of. cresol and formalin.

The subject of the patent.

The method of manufacturing products from the condensation of phenols with aldehydes described in patent No. 5027, characterized in that organic or mineral fillers are mixed at a temperature not higher than 60 ° C with a liquid mixture of phenols with formalin and sulfonic acids, or with the primary condensation product by pulverization the latter, produced under pressure, after which the resulting mixture is transformed into products in the usual manner.