2results about "Preparation by etherification" patented technology

The application discloses an oil-soluble yellow dye shown in formula A, a preparation method thereof and application of the oil-soluble yellow dye as a colorant in a non-aqueous solvent, and has the following advantages: (1) raw materials are simple and easy to obtain, cost is low, a synthesis process is simple, and industrialization is easy; (2) a product with rich types and complex composition can be easily obtained by adjusting a halogenated hydrocarbon type and reaction conditions, and remarkable advantages are possessed in performance control and formula security; (3) the product shows good solubility in various organic solvents, can be well dissolved at low concentration and high concentration, and has good application prospect in ink, paint and polymer coloring; wherein R1 is H or a C2-C12 even carbon straight-chain or branched-chain alkane, R2 is H or a C2-C12 even carbon straight-chain or branched-chain alkane, and R1 and R2 cannot be H simultaneously.

This invention discloses a cationic dye and its preparation method, belonging to the field of dye technology and patent classification number C09B26 / 04. The method uses 2-amino-4-nitrophenol as a starting material, which undergoes diazotization and coupling with N-ethyl-N-(2-hydroxyethyl)aniline to obtain an azo precursor containing dihydroxyl groups. Subsequently, this precursor undergoes etherification, silanization, and quaternization reactions sequentially with epichlorohydrin, γ-aminopropyltriethoxysilane, and diethyl 2-bromoethylphosphonate to generate a dye intermediate containing siloxane and quaternary ammonium salt groups. Finally, by adding tetraethyl orthosilicate and tributyl borate, a sol-gel reaction is carried out under acidic conditions to form a nano-borosilicate coated structure. After precipitation, washing, and drying, the final product is obtained. The cationic dye prepared by this invention exhibits good alkali resistance.