Method for preparing black fluorane thermal-pressure sensitive dye by virtue of one-step method

• Main Authors: Peng Wenbo, Kong Ming, Liu Yufeng, Gong Han, Wan Degui, Tao Jianguo
• Format: Patent
• Language: Chinese; English
• Published: 10.08.2016
• Subjects: ADHESIVES; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; DYES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HETEROCYCLIC COMPOUNDS; LAKES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MORDANTS; NATURAL RESINS; ORGANIC CHEMISTRY; ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES; PAINTS; POLISHES; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention discloses a method for preparing a black fluorane thermal-pressure sensitive dye by virtue of a one-step method. The method comprises the following steps: (1) acid-catalysis cyclic condensation: adding a diphenyl ketone derivative and 2-methyl-4-methoxydiphenylamine into an organic solvent I with a relatively low boiling point, adding a sulfuric acid solution while stirring, and heating to a reflux temperature to react for 1.5-4.5 hours; and (2) post-processing refining: adding water into reaction liquid obtained in the step (1), recycling the organic solvent I with the relatively low boiling point by virtue of heat release, then adding a nonpolar solvent II into the recycled reaction liquid, carrying out heating reflux to separate a water phase so as to obtain an organic phase, carrying out cooling, crystallization, filtering and solvent washing on the organic phase, and drying, so as to obtain the black fluorane thermal-pressure sensitive dye. 本发明公开了种步法制备黑色荧烷类热压敏染料的方法，包括如下步骤：1)、酸催化缩合成环：先在较低沸点有