I.Role of rosin:

1, rosin is often used as a tackifying resin in hot-melt, pressure-sensitive and solvent-based adhesives to increase the initial viscosity and improve bonding strength.

2, rosin can also improve the drying and peel strength of water-based acrylate film adhesive, the best dosage of 6% of the total monomer.

3, rosin and soda ash or caustic soda together with steaming, the formation of rosin soap. Rosin soap has a great decontamination power, soluble in water, can dissolve grease, easy to foam. Rosin has a viscous, can make the soap is not easy to crack and rancid deterioration.

4, rosin is soluble in a variety of organic solvents, and easy to film, gloss, is one of the basic raw materials for paint coatings.

5, rosin can remove oxidized surface matter, play the role of flux.

Two, the source of rosin:

1, rosin is a yellowish to yellow-red transparent solid rosin is a natural organic matter, mainly composed of a variety of resinous acids, easily soluble in a variety of organic solvents, with a unique chemical activity.

2, rosin is a pine tree trunk inside the outflow of oil by high temperature melting into a watery, dry knot into a lumpy solid (no fixed melting point), so the role of rosin is still quite a lot, and is a natural product.

The term rosin refers to a type of turpentine that can be obtained from a wide variety of pine trees, particularly the longleaf pine (Pinus palustris), Cuban pine (Pinus caribaea), and torch pine (Pinus taeda), which are produced in the southeastern United States, and also from pine-like species around the world. The stomata are cut on these trees so that a highly viscous secretion [known as turpentine extract (GUM THUS) is extracted by distillation. This volatile liquid is rosin; the hard solid resin that remains is called rosin. Although rosin is not satisfactory as a constituent of any varnish or pigment, it has been used as an adulterant in varnishes and pigments because it is one of the cheapest raw materials.