Vat Yellow 1

Application Features

Colour Fastness Test

Vat yellow G appearance is  brown powder insoluble in water acetone alcohol chloroform and toluene are slightly soluble in o-chlorophenol pyridine is soluble in nitrobenzene (hot). It is diluted in dark orange in concentrated sulfuric acid to produce a yellow precipitate. The leuco body formed in the alkaline powder solution is green in the blue acid powder solution.

Brown powder. Insoluble in water, ethanol, acetone, chloroform, toluene, slightly soluble in o-chlorophenol, Pyridine , soluble in hot the difficulties. In alkaline insurance powder also for blue ones; In the acidic insurance powder also in stock for green; The strong sulfuric acid for dark orange, yellow diluted produce precipitation. This product is crisp cloth varieties, for old yellow color Brightness as reduction golden, oxidation difficulties, after soaping color phenomenon.

Mainly used for cotton cloth dyed and suspension of the volume of body knot dyeing, also can dip to cotton yarn, can be directly printing and the discharge, suitable for PVA, PVA/cotton blended fabric dyeing and printing. Can be processed into organic pigments.

Vat yellow 1 Use condition:

1. When Vat yellow 1(Vat yellow G) for cotton product dyeing and dip dyeing, it is suitable to use method A or B. The reduction temperature is 50~60°C, the drying time of the dry cylinder is 40min (the fine powder is 15min). Because of the reduction of yellow G, there is no light brittleness. Therefore, it maintains a certain amount of demand in the printing and dyeing process of cotton fabrics, and can be used as a main color or color matching dye. In addition to being used for dyeing and dip dyeing, it can also be used for suspension padding.

2. It is easily reduced to leuco, and it is often used as a qualitative test to detect whether the powder in the dye liquor is sufficient. When the amount of the powder in the dye liquor is sufficient, the test paper changes from yellow to blue. Purple, if the transition is slow, it means that you need to add insurance powder.

3. The leuco body has good affinity to cotton fiber, good leveling property, and has a certain hiding power for dead cotton. The dyeing curve is shown in Figure 4-5. It has a slow oxidation rate and often requires an oxidizing agent. Oxidation. If it is oxidized with hydrogen peroxide or sodium perborate, the color is bright. If it is oxidized with sodium dichromate and acetic acid, the color is dim.

4. It can be used for direct printing and anti-discharge printing. The basic color paste is printed without pre-reduction method. Potassium carbonate or soda ash is used as an alkali agent, and the white block is added before use.

5. It can be used for dyeing or printing of vinylon and cotton blended fabrics, and can obtain a uniform color effect.

6. The dyed fabric is finished with BHES resin and the color is very dark.

Precautions

1. Vat yellow 1 Printing and dyeing products have photochromism, which can be restored by air or mild soaping.

2. Vat of yellow 1 dyeing cloth should avoid vigorous soaping to prevent color change.

3. Vat yellow 1 should be stored in a cool, dry place to avoid moisture.