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Varieties of fluorescent brighteners for cotton fabrics

2021-09-14

Commonly used varieties are: C.I. Fluorescent Brightener 17, 24, 28, 30, 32, 71, 85, 103, 114, 134, 220, 264, 351 and so on. For the convenience of application, according to the directness of the optical brightener to the fiber, it can be roughly divided into three categories: high directness, medium directness, and low directness.

1. Highly direct fluorescent whitening agent
This type of fluorescent whitening agent is not affected by the temperature of the dye bath and the concentration of the electrolyte, so they are suitable for intermittent dip dyeing processes. If the fiber bleaching and whitening are performed in the same bath, the fluorescent whitening agent that is resistant to chlorine bleaching or oxygen bleaching should be selected. To meet these requirements, there are C.I. Fluorescent Brighteners 24, 28, 30, 32, 71, 85, 134.

2. Medium direct fluorescent whitening agent
This type of fluorescent whitening agent is more affected by the electrolyte concentration of the dye bath and less affected by temperature. So they are suitable for continuous pad dyeing or dip dyeing processes. Commonly used products are C.I. Fluorescent Brightener 103, 114, 220, etc.

3. Low direct fluorescent whitening agent
The dye uptake rate of this type of fluorescent whitening agent decreases with the increase of temperature, and is less affected by the electrolyte concentration of the dye bath. They have particularly good level dyeing properties, and can avoid the color difference between the front and back of the fabric, so they are suitable for tube (high pressure) whitening or pad dyeing whitening process. Commonly used products are C.I. Fluorescent Brightener 17,264,351.

How to use fluorescent brightener for cotton fabric？

Dye whitening; pad dyeing whitening; sizing whitening; discharge whitening whitening; anti-white printing whitening; brightening light-colored fabrics.

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