Лако-красочные материалы — производство

Esters (Figure 4.4) are also an important type of active solvent used in the coating industry. Esters are similar to ketones in terms of their polarity and hydrogen bonding capability, but they are less polar than corresponding alcohols and their solvency is slightly weaker than ketones of similar volatility. Esters often have a characteristic fruity odor. Esters used as solvents are generally alkyl acetates and propionates and glycol ether acetates. Esters have extremely good solvency for a wide variety of polar resins. With increasing carbon chain length in the alcohol and acid, the solvency for polar products decreases, but increases for less polar products. The solvents of this class cover a wide range of volatility, depending on the number of carbon atoms in the alcohol component, which is generally methyl through hexyl. Glycol ether acetates are generally slow evaporating and are used in coatings as retarder solvents to increase open time and improve flow and leveling properties.