Coating knowledge: oil rosin

Talloil rosin, also known as Tall oil rosin or tall oil rosin, is one of the three major sources of rosin. It is a kind of rosin extracted from pine pulp as a raw material and processed with the pulp floating oil waste during the production process of kraft pulping.

The main components of tall oil rosin are fatty acids and behenic acid. When using conifers as raw materials to make wood pulp by the kraft process, the resin acids and fatty acids in the wood form saponifications during cooking and float along with the neutral substances in cooking black. The upper layer of liquid, after separation, is called wood pulp floating oil. The slick oil is separated, acidified, and rectified to separate oil-fat fatty acids, tall oil rosin, and slick asphalt. Neutral slick asphalt can be used as an additive and adhesive for paperboard, rubber and asphalt.

The oil-borne rosin has a complex composition. There are dozens of known components in crude oil rosin. There are still a large number of trace components, and the total amount of trace components is considerable. In the three major components of the oily rosin, the complexity of fatty acids is the most, followed by unsaponifiables. Among the fatty acids, the most abundant linoleic acid accounts for only 22% of the total fatty acids. It is widely used in the manufacture of soaps, lubricants, flotation agents and the ink industry.

Technical indicators:

Uses: The nature of oily rosin is similar to that of gum rosin. It is mainly used in industries such as papermaking, coating, soap making, adhesives and polymers.

Physico-chemical properties: From the wood pulp and paper industry, the black liquor from the sulphate pulp was processed. It was originally inferior to gum rosin in performance. Later, due to the continuous improvement in quality, the performance has been similar to gum rosin. As the proportion of pine used in papermaking was reduced, the yield of rosin obtained from oil fractionation (from 27% to 21%) was reduced. Therefore, although the crude oil fractionation capacity has increased in recent years, the production of oil rosin still remains relatively stable, accounting for about 30%-35% of the total amount of rosin. The nature of oil-borne rosin is similar to that of gum rosin. It is mainly used in industries such as papermaking, coating, soap making, adhesives and polymers.

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