Solvent dyes are one of the many types of colourants used worldwide to impart colour onto materials and objects. This type of dye is called solvent dye as it has the property of being soluble in organic solvents. On the other hand, it is insoluble in water.
Technically, solvent dyes are soluble in non-polar mediums and solvents. This categorization refers to the solvent’s structure, chemical makeup, and charge that decides and identifies the types of substances and materials it can dissolve. Non-polar solvents are those which contain bonds between atoms with similar electronegativities, e.g., carbon and hydrogen. This is why solvent dyes are beneficial for colouring hydrocarbons and fuels.
A few types of organic solvents in which this dye can be dissolved are alcohols, ethers, ketones, aliphatic hydrocarbons, aromatic hydrocarbons, oils, fats, waxes, and chlorinated hydrocarbons. Other non-polar solvents include alkanes (like pentane, hexane, and heptane), aromatics (like benzene, toluene, and xylene), acetic acid, chloroform, diethyl ether, ethyl acetate, methylene chloride, pyridine, etc.
Solvent dyes have a wide range of applications and use across many industries. Mainly solvent dyes have more uses in the plastic and petroleum industries as these dyes have substantial benefits in fuels, oil lubricants, grease, wax, and plastics colourations.
Here are a few popular solvent dyes with their applications.