Лако-красочные материалы — производство

Compared to aliphatic solvents, aromatic hydrocarbons (Figure 4.1) have higher solvency for almost all types of resins. Aromatic hydrocarbons are also used as diluents for coatings based on nitro­cellulose, cellulose esters, and ethers in combination with active solvents, such as esters and ketones. Aromatic solvents that are com­monly used in the coating industry are toluene, mixed xylene (xylol) and two types of high-flash aromatic naphthas. Aromatic naphthas are primarily higher-substituted alkylbenzenes, including tri — and tetramethylbenzene, isopropylbenzene (cumene), methylethylben — zene and diethylbenzene. There are two grades of aromatic naph­thas, one with a flash point higher than 38 °C and predominantly C9 aromatics, and another with a flash point higher than 60 °C and

C10 aromatics. Styrene and vinyl toluene are also aromatic hydro­carbons that act simultaneously as solvents and reactive diluents for chemical crosslinking with unsaturated polyester resins and in UV-cured coatings.