SU43990A1 - The method of manufacture of drying oil - Google Patents

Description

The present invention relates to a method for preparing artificial varnish.

The currently used artificial lintels consisting of rosin, mineral oils and solvents have great drawbacks, since rosin imparts greater brittleness to the film, mineral oils prevent the drying of the linseed oil, and in addition, the film has the property of peeling from the painted surface.

The author of the present invention proposes a method for producing artificial varnish, free of the above defects. The method consists in using distillate of heavy fractions of rosin and distillate of heavy fractions of pine resin treated with metal oxides as film-forming substances without the use of any kind of mineral oils.

For carrying out the invention, 200 kg of rosin distillate fractions from 250 to 325 ° are rosin oil with beats. weighing 0.990-0.995, 50 kg of pine resin distillate fraction, distilled at a temperature of 275-325 ° (resin oil, specific gravity 0.980-0.985) is heated to 200, after which heavy metal oxides are gradually added in an amount depending on acid number of the used distillates.

After adding the entire amount of metal oxides with vigorous stirring, the whole mass is gradually heated to 250 °. Stirring is carried out until the weight applied by a thin layer on the glass plate gives a transparent rubbery shiny film. After that, after cooling it to 200 °, 150 kg of distillate of rosin fraction is added, which is distilled at a temperature of 180-250 ° (rosin oil specific gravity 0.950-0.955) and 50 kg of pine resin distillate from 225-275 ° ( resin oil, specific weight (0.935-0.940).

At a temperature of 165 °, 50 kg of distillate resin is injected from 180-225 ° (sp. Weight 0.910-0.915), after which the mass is boiled down to a clear transparent film.

100 KI of turpentine, 200 kg of solvent naphtha and 200 kg of white sprint, or 400 kg of one of the indicated solvents are gradually added to the film-forming mass cooled to 150.

Rosin does not give almost no waste and garbage in the process of distillation. The loss is about 10 / V relative to the amount of rosin loaded for the distillation.

The remaining rosin residue in the pot in an amount of about 15% is a pasty mass with a high saponification ratio.

In the production of varnish for paints of dark colors, this residue is also used by introducing it along with heavy distillates of rosin and resin.

As for pine resin, it gives valuable waste, the so-called "mirror peck" in the amount of 15 - to be subjected to distillation of the resin.

The distillation wood vinegar of a very low concentration (2-2.5%) in an amount of 5Vo with respect to the resin is a low-value waste. In general, the distillation losses of the resin are determined in.

According to the test data obtained by the proposed method, the following indicators are obtained:

specific weight at 20 ° -0,925

Engler 3 viscosity

sucks for 24 hours-0.2%

drying time:

a) dust-3 hours

b) full (without otlip) -24 hours

Clemen hardness-200 g

the transparency of the film is full

good nets - good

acid number - 15

elasticity - withstands bending 180 ° on a 0.3 mm metal rod

water resistance - 12 hours; after 12 hours the film is white but not destroyed

heat resistance — when the film is heated from 50 to 100, the film does not soften and is not tack free.

The subject matter of the invention.

A method of making a varnish, characterized in that the resin acids of the heavy fractions of rosin distillate-rosin oil, beats. weight 0.950-0.955 and 0.990-0.935, and pine resin - resin oil, sp. Sulfur 0.980-0.985 and 0.935-0.940 are treated with heavy metal oxides, after which the resulting mass is dissolved in a solvent mixture consisting of turpentine, solvent naphtha and white alcohol or in one of the indicated solvents.