Fluorescent Whitening Agent PRA
Properties: Fluorescent Whitening Agent PRA is a derivative of the diphenylethylene bistriazine type . The product has an appearance of white crystalline powder and a nature of anion. It is resistant to acids and resistant to hydrogen peroxide bleaching.
Application: Whitening Agent PRA can be used for whitening cotton, viscose and Jinlun fibers and can also be used as a fine whitener for detergents. In slightly acidic medium, it is able to whiten silk fabrics, animal fibers and polyamine fibers. PRA can be use in a bath together with peroxide or reduction bleaching agent, or added into the water bath of softener. It can whiten paper to a strikingly white color, which Whitening Agent VBL is far from being able to do.
Directions for use and dosage: For whitening textiles, dissolve PRA in hot water until the solution becomes clear; adjust the PH value to 5.5~9;carry out pad-dyeing with a dosage of 1~3g/l at room temperature; and then dry at 100 . For whitening detergents, the dosage can be as much as 0.4% or over, as the yellowness factor of this product is remarkably higher than that of Whitening Agent VBL.
Specifications:
Item |
Indices |
Appearance |
white even-sized powder |
Whitening intensity |
equivalent to the 100 points of the standard agent |
Hue |
slightly different from the standard agent |
WCIE(whiteness difference between DMS and the standard agent) |
≥-3.0 |
Moisture content |
≤5% |
Content of insoluble impurities |
≤0.5% |
Fineness (quantity of residue on sieve having 180um meshes) |
≤10% |
Packaging and storing: Packaged in cardboard barrels, 25kg or 50kg each. Stored in dry room.
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