Optical Brightener OB
Optical Brightener OB
Optical brightener OB is poorly soluble in water, and soluble in alkane, mineral oil, and common organic solvents.
Optical Brightener OBcan be used for whitening thermoplastics, PVC, PS, PE, PP, ABS, acetate fibre, paint, coating, printing ink, etc. It can be added for whitening at any stage of process of polymers and can give the finished products a bright bluish white glaze.
The dosage should be 0.01-0.05% on weight of plastic. Mix Optical brightener ob with plastic granulars thoroughly and carry out shaping proudction.
According to the different producing techniques of paints, there are two ways of adding optical brighteners:
(1)Optical brighteners OB are usually added in powder form during the grinding process (also the preparationprocess of paste) of paints production, then grinded together with paint vehicle. After fully grinded to microparticle with diameter ≤20μm, evenly disperse it into paints.
(2)After levigating optical brightenersOB, add it into paints by high-speed dispersion machine.
Prescription (mass fraction):
white enamel (polyurethane type or alcohol acid type): 99.9%
optical brightener OB: 0.02% ~ 0.05%
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