Increasing the hardness of rosin. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Increasing the hardness of rosin. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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Lack of rosin as a raw material for the preparation of varnishes lies in its relatively low melting point, brittleness and stickiness ... An increase in the hardness of rosin is achieved by fusion with lime. Zinc oxide, lead oxide or other heavy metal oxides (driers) are often added to the resulting product. As a result of such processing, rosin acquires higher qualities.

To increase the hardness of the rosin, the resin is heated and only when it melts, driers are first added and then lime is added in small portions. When adding desiccants and lime, you need to mix the whole mass well. Some believe that desiccants dissolve more easily in pure resin than in resinous lime formed as a result of the combination of lime and rosin. Some dispute this opinion and believe that driers dissolve more easily in pitch lime.

Fusion of rosin can also be done as follows.

Carefully melt the rosin in an iron kettle and heat until all the water is removed. When the alloy stops foaming, it is heated to 170-180 °C and freshly slaked sifted lime is added to it in small portions. Mix everything well, maintaining the temperature at about 200-210 °C. Heating is stopped when the test on the glass shows a completely homogeneous transparent mass without grains. The resulting resinous lime (resin-lime salt) differs little in appearance from rosin.

Burnt lime, obtained from marble lime, is quenched with water, and the resulting white powder is mixed with a small amount of heated glycerin and added, while mixing, to the molten rosin. Burnt marble lime should not contain impurities of carbonates, silicates and iron.

A new method was proposed for obtaining resin-lime salt (rosin mainly consists of resin acids; when rosin is treated with lime, lime salt of resin acids is obtained). This method is based on the fact that acetic acid salts are processed with molten rosin.

Using this method, rosin is melted and 25-30% calcium acetate salt is added to the liquid mass, after which the mixture is heated to 160 °C until the release of acetic acid vapor stops. The advantages of this method are that it produces a lighter product. You can also increase the hardness of rosin by heating a mixture of molten rosin and zinc oxide to 200 °C. The resin acids contained in rosin combine with zinc oxide, due to which rosin acquires significant hardness.

You can also increase the hardness of rosin by treating it with air oxygen. For this purpose, crush the rosin into small pieces, place them in a flat frying pan and heat the frying pan in a water bath, carefully ensuring that the rosin does not melt. While heating, blow a uniform stream of air over the pan. As a result of this operation, the melting point of rosin from 50 to 60 °C is raised above 100 °C, and the rosin itself becomes harder.

Rosin is refined by spraying (spraying) the molten rosin with a jet of air. The smallest rosin dust comes into contact with atmospheric oxygen, due to which the melting point of rosin rises. Sprayed, thus, the rosin is collected in a vessel.

Author: Korolev V.A.

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