Лако-красочные материалы — производство

Chemically, cellulose is a natural polysaccharide with a high MW, linear structure having repeating anhydroglucose units. It is mainly amorphous but also has considerable crystallinity, making raw cel­lulose insoluble in organic solvents and water. Because of this inso­lubility, cellulose finds no applications in coatings in its unmodified form. To render solubility, it must be chemically modified to reduce hydrogen bonding between adjacent polymer chains. This can be accomplished by substituting some of the hydroxyl groups by bulky, less polar groups such as nitro (forming nitrocellulose) or alkyl groups (forming cellulose ethers). As the degree of substitution increases, solubility increases. Important cellulose ester binders are nitrocellulose, cellulose acetate and cellulose acetate butyrate.