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Naphthol AS-BS (2-hydroxy-3-naphthoic acid m-nitroanilide) |
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| Specification: | ||
| - Structural Formula:  - Molecular formula:.................................... C17H12O4N2 - Molecular weight:.......................... 308 - Content:...........................................................98%min. - Appearance:....................................Light yellow powder - Primary melting point of the dried:.......................242 - Insoluble matter in alkali:..............................0.5% - Shade and strength when coupling with Naphthol As on cotton fibre:.....similar to the standard - Percentage of screenings(80 mesh):.........................0.5% - The Naphthol AS-BS is made from 2-hydroxy-3-naphthoic acid and m-nitroaniline by processes of condensation between them. When it is coupled with red base diazo salt on cotton fibre, the insoluble azoic color will be fromed. This kind of azoic color is characterized by brilliant shade, high color-giving volume, excellent fastness, low cost and low energy consumption. Owing to a rather high affinity with cotton, it can be used as ground agent for printing and dyeing of cotton fiber. In addition, ot finds application in dyeing of viscose fibre, ramie & flax fibre, vinylon viscose fibre, ect. |
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