Rosin

Etymology

The name comes from Kolophôn (a city Greek antique of the minor Asia) from where this substance was drawn. In the Moors of Gascogne, where it was produced in quantity, rosin bore the name Gascon of arcanson , which is at the origin of the name of the town of Arcachon.

Presentation

Rosin is solid and breakable with room temperature. Its color goes from the very clear yellow to quasi black according primarily to the control of distillation, the color or rank is defined by a scale of letter going of D for darkest in X for most clearly. Rosin does not melt but softens with heat, its softening point being located around 70°C.

Rosin bears commonly the name of pof for the climbing ones in Escalade, because of the use of rosin in a rag struck the catches of blocks and cliffs; rosin is then in the form of powder.

This resin has the properties to stick and waterproof. It belongs to the binders used in the Antifouling S

Composition

Rosin is made up to 90% of a mixture of Acide S organics of the family of the resinic acid Diterpène S called , which answer the empirical formula C₂₀H₃₀O₂. These resinic acids are isomers. The proportion of the various resinic acids in rosin is variable according to the species of pine from which rosin was obtained. Certain acids are present only at certain species (and are thus characteristic for them).

Toxicology and ecotoxicology

Rosin (or “Rosine”) has many uses. One finds it in particular in paintings Antifouling where it replaces the prohibited Tributylétain. It is irritating and an allergenic for the Peau and the respiratory tracts, in pure form or by its breakdown products, without the mechanisms of action being still well included/understood. More, to click on this bond

Production

Rosin is mainly obtained starting from the distillation of the gem of the pines but it can also be recovered as under product of the manufacture of paper as a rosin of tall oil of the Kraft process. Another mode of obtaining but which is exclusive E. - U. is by extraction with solvents of stocks of pines.

The production of gem rosin is dominated in the world by China which exploits inter alia Pinus massoniana and Pinus Kesyia.

Uses in a rough state

Music

Rosin is used for the string instruments rubbed. One rubs it on the wick bow S to allow the setting in vibration of the cord, because without rosin the hairs slip without frictions on the cord almost without drawing a sound from it. Rosin is in general appeared as a small block (square or round) solid and transparent of yellow color (but certain times of red or green color).

This resin of pine, formerly produced in Colophon, in Minor Asia, is essential to the work of the hairs: it is it which confers the asperity to them of which they have need to rub the cords of the Violon. If the wick of the Archet were coated with soap, it would not produce any sound. They are the grattements of these thousands of roughnesses which draw the cord and let it set out again. All that is obviously invisible with the naked eye, but in this combination of the hairs and rosin, all occurs as so of the thousands of little fingers nails carried out a kind of pizzicato continuous. Thus is born the vibration. Of this microscopic mechanics the voice of the Violon hatches.

It is also used in the manufacture of the accordions, mixed with wax, to fix the executives of sheers at the diagrids.

Sport

The players of Rugby coat with them sometimes the hands when the part is played in wet weather.

In Climbing, rosin (or pof ) is wrapped in an unspecified fabric (old woman towel, old cloth of kitchen, sock) closed again to give a ball. The too patinated catches are then tapped with this ball to offer a better adherence. Rosin does not deteriorate the rock, contrary to the Magnésie which, once humidified, adhesive like cement with the rock and returns the catch slipping for the climbing following.

Dance

The ballet dancers coat with them their slippers in the form of powder contained in a vat in order to amplify hangs it on the ground.

Engraving

This powder resin is applied to the metal plate in fine uniform layer. After heating, it is fixed on the plate creating a more or less fine stainless mesh according to the smoothness of the grains. The nitric acid or the iron perchloride corrodes space between the grains and leaves a screen.

Various uses after transformation

But the principal outlets of rosin are based on chemically modified forms of the latter. Indeed the chemical structure of the resinic acids makes it possible to produce Savon S, résinates, Esters of rosin but also of the forms hydrogenated, dehydrogenated and polymerized. These various modified rosins have applications in many industrial fields where one seeks properties of sticking and hydrophobicity such as the varnished , the Peinture S, the Adhésif S, the Encre S, the Colle S of paper mill, the Cosmétiques, the Chewing gum S, but also of the properties of scouring as for flows of welding.

References

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