What is rosin for?

YES anifol refers to natural insulating resins… It is a brittle glassy substance in the form of irregularly shaped pieces. Rosin is obtained as a result of heat treatment of the resin — the sap of coniferous trees. After distillation of water and turpentine, a solid amorphous substance is formed from the resin - rosin, which is subjected to chemical cleaning.

The color of refined rosin ranges from light lemon to dark orange. The darker the color of rosin, the more impurities in it reduce its electrical insulating properties.

In electrical engineering, class I and II rosins of yellow color are used. Rosin contains resin acids: abietic, rosin, essential oils and other substances.

The main characteristics of rosin: density 1.07 — 1.10 g / cm3, softening temperature 65 — 70 ° C (transition of rosin into a liquid state occurs at 110 — 120 ° C), ε = 3.5 — 4.0 , tgδ = 0.01 — 0.05, Ep = -15 — 20 kV / mm. The colophon is polar dielectric.

Rosin is a thermoplastic material that is heated and dissolves well in many solvents — turpentine, gasoline, ethyl alcohol, acetone, mineral oil, etc.

In electrical engineering, rosin is used as a thickener for mineral oils used for impregnation paper cable insulation, and also as an integral part of electrical insulating compounds with oil rosins.

Rosin is also used in the production of driers — substances that speed up the drying process of oil varnishes. In this case, the molten rosin is heated with lead oxides PbO, manganese M.ne2, etc. As a result, resins are formed, which are salts of the corresponding metals and resin acids from rosin.

Rosin is widely used as flow when soldering copper wires When melted, rosin dissolves copper and tin oxides and ensures reliable soldering.

Besides rosin from natural insulating resins, shellac and bitumen are also used in electrical engineering. Shellac varnishes are used for gluing mica sheets in the production of micanites and for impregnation coils of electrical appliances. Bitumen are widely used for the production of electrical insulating mixtures and impregnating mixtures — compounds and oil-bitumen electrical insulating varnishes for various purposes.

Colophon