Optical Brightener KCB
Structural formula
Chemical name: 1,4-bis(benzoxazolyl-2-yl)naphthalene
C.I.:367
CAS NO.: 5089-22-5/63310-10-1
Technical data:
Appearance: yellowish-green crystal powder
Content: ≥99.0%
Melting point: 210-212℃
Molecular formula: C24H14N2O2
Molecular weight: 362
Solubility: insoluble in water, soluble in organic solvents
Maximum absorption spectrum wavelength: 370nm
Maximum fluorescence emission wavelength: 437nm
Other features: good heat resistance and light resistance; good chemical stability, no reaction with plasticizers, foaming agents, crosslinking agents, etc., good compatibility with polymer materials, and no bleeding.
Application
Optical brightener KCB is one of the best products among many fluorescent whitening agents. Strong whitening effect, bright blue and bright color, it has good heat resistance, weather resistance and chemical stability. It is mainly used for the whitening of plastic and synthetic fiber products, and it also has obvious brightening effect on non-ferrous plastic products. It is also widely used in ethylene/vinyl acetate (EVA) copolymers, which is an excellent variety of optical brighteners in sports shoes. It is also widely used in PE, PP, PVC, PS, ABS, PMMA and other plastic films, molding materials, injection molding materials and polyester fibers. It also has a significant effect on the whitening of paints and natural paints. This variety is the lowest toxic among many varieties of whitening agents. The United States stipulates that it can be used for whitening food packaging materials.
Reference Dosage
For plastics or resins, the general dosage is 0.01-0.03%, that is, about 10-30 grams of BC-111 fluorescent whitening agent is added to 100 kilograms of plastic raw materials. The user can adjust the specific dosage of the whitening agent according to the requirements of whiteness. If an ultraviolet absorber such as titanium dioxide is added to the plastic raw material, the optimal amount of the whitening agent should be adjusted appropriately.
PE : 10-25g/100kg plastic raw material
PP : 10-25g/100kg plastic raw material
PS : 10-20g/100kg plastic raw material
PVC: 10-30g/100kg plastic raw material
ABS : 10-30g/100kg plastic raw material
EVA: 10-30g/100kg resin
If used in transparent plastic film, the reference dosage of brightener: 1-10g/100kg plastic raw material
Packing: 25kg cardboard drum lined with plastic bag or packed according to customer requirements
