Fluorescent Whitening Agent #31
Properties: Fluorescent Whitening Agent #31 is one of the diphenylethylene triazine compounds. Its chemical structure is approximately the same as that of VBL, but is of an unsymmetrical type. #31 has an aniline group in position 6 on one ring of the triazine and a metachloranilino group in position 6 on the other. This agent is a light yellow even-sized powder in the nature of anion and has a slight greenish blue tone and rather good resistance to sunlight and ageing.
Applications: When used in synthetic washing powder, #31 does not only have stronger whitening effect than VBL on the powder, but also makes it more efficient. In addition, #31 has excellent whitening effect on materials such as cotton fabric , paper and Jinlun.
Direction for use and dosage: In process of washing powder production , add #31 with a dosage of 0.1-0.4% on weight of washing powder, mix them thoroughly and then carry out palletizing through spraying.
Specifications:
Item |
Indices |
Appearance |
light yellow even-sized powder |
Fluorescence intensity( or whiteness) |
equivalent to 100± 5 points of the standard agent in this plant |
Tone |
greenish blue |
Yellowness factor |
approximate to that of the standard agent |
Content of insoluble impurities |
≤0.5% |
Moisture content |
<5% |
Fineness (quantity of residue on sieve having a mesh of 40 |
≤5% |
Packaging and storing: Packaged in cardboard barrels, 25kg or 50kg each. Stored in dry room.
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