Modern dye industry is the synthesis of various dyes in dye chemical plants with various basic raw materials produced in petrochemical, coal chemical and other industries, such as benzene, naphthalene, etc. At present, there are tens of thousands of dyes in the world. It is widely used in all walks of life and daily life. The colors of clothes are dyed with dyes, and the colorful commodities can not be without their contributions.
Dyes are organic compounds that can dye fibers or other substrates into a certain color. Dyes are mainly used for the dyeing and printing of fabrics. Most of them are soluble in water or can be converted into soluble state during dyeing through certain chemical treatment. Some dyes are insoluble in water but soluble in alcohol and oil and can be used for the coloring of oil wax, plastics and other substances.
Coating is a kind of viscous liquid that is coated on the surface of protected or decorated objects and can form a continuous film firmly attached to the coated objects. It is usually made of resin, or oil, or lotion, with or without pigments, fillers, and corresponding additives, and is prepared with organic solvent or water.
In the thousands of years of civilization before the invention of chemical dyes, human dyeing resources were not scarce. At that time, everyone used natural dyes that could be extracted from nature and finally decomposed and returned to nature. This kind of ancient wisdom spread for thousands of years should be studied and developed, so that modern people can have the opportunity to review and reflect when facing dyeing problems. The characteristic of natural dyeing is the sustainable use of natural resources while avoiding the serious pollution of chemical dyes.
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