Лако-красочные материалы — производство

In IS0 4618/3, natural resins are defined as resins obtained from a vegetable or animal origin. Natural resins have been used in coa­tings for a long time. In recent times, although technologically advan­ced synthetic resins have replaced these materials, certain natural resins have maintained their place for particular uses as modifiers. They are classified, based on their source, as recent resins, fossil resins and recent-fossil resins. Recent resins are typically obtained by collecting exudations from plants, while fossil resins are those that have been buried underground over geological time. In general, natural resins are low MW compared to many synthetic resins used in coatings, and chemically, they are mixture of various polycyclic and aromatic compounds. As their applications in coatings have been limited in recent years, we will briefly discuss some important natural resins in the subsequent sections.