Reactive dyes and preparation methods thereof

US12091552B2 · kind B2 · utility

Assignee

• Nanjing University · CN

Inventors

• Min Li · New Orleans, US
• Wujun Ma · Nantong, CN
• Jialiang Zhou · Nantong, CN
• Wenlin Qu · Nantong, CN
• Ting Ding · Tuji, CN
• Lifen Mao · Nantong, CN
• Shiyu Li · Weifang, CN

Key dates

• Filing date: Aug 7, 2023
• Grant date: Sep 17, 2024
• Expiry date: Aug 7, 2043

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/84
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Disclosed are reactive dyes and preparation methods thereof. The reactive dye may be prepared using heterocyclic primary amine as a diazo component, 4,4′-diamino-2,2′-stilbenedisulfonic acid, s-triazine, or ethylenediamine as a bridging group, and a dimonochlortriazine group as an active group. The color-changing compound is covalently bonded into the fiber chemical structure by nucleophilic substitution reaction between monochlorotriazine and the hydroxyl group in a textile structure, and the size of the conjugated system and the range of electron delocalization of the dye are changed by a reversible isomerization reaction of the hydroxyl group adjacent to the diazo group and the diazo group under different pH regulations. Moreover, the dye has a double color changing structure, which improves the capability of the dye combined with —H/—OH. The pH value range that can cause color changes in the dye is effectively expanded to include weak alkali, weak acid or even neutral conditions.