Preparation
(a) in the presence of Pyridine, with Chlorosulfonic acid treatment C.I. Vat Yellow 5 leuco; (b) used in Pyridine metal (such as copper, iron, zinc, etc) and Sulfur trioxide source (such as Sulfur trioxide, Chlorosulfonic acid or Methyl chlorosulfonate) processing C.I. Vat Yellow 5. The above two kinds of circumstances are through with alkali, filter out the insoluble,, remove Pyridine?and salting-out.
Properties and Applications
dark yellow light brown to yellow. Deep yellow powder, soluble in water. The strong sulfuric acid for purple. Can be used for direct printing of cotton fabrics, can also be used to prevent dyeing and printing white, but is not suitable for discharge printing color.
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Standard
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Ironing Fastness
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Chlorine bleach
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Light Fastness
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Mercerized
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Oxygen bleach
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Soaping
|
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Fading
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Stain
|
|
ISO
|
5
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2-3
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4
|
|
|
4
|
|
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AATCC
|
5
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3
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3-4
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2
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3
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5
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