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Ranbar Optical Brightener OB – Optical Brightener for Paint

Ranbar Optical Brightener OB is an optical brightener designed specifically for coating applications. It improves the appearance and performance of coatings.

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Ranbar Optical Brightener OB for Paint

 

Ranbar Optical Brightener OB is a type of Optical Brightener specifically designed for coating applications. Its role in coatings is to enhance the whiteness and brightness of the product, improving its appearance and performance.

 

  • Brand: Ranbar
  • Model: Optical Brightener OB
  • Chemical structure: 2,5-Thiophenediylbis(5-tert-butyl-1,3-benzoxazole)
  • CAS number: 7128-64-5
  • C.I structure number: 184
  • Molecular weight: 430
  • Molecular formula: C26H26N2O2S
  • Product packaging: 25kg

 

Physical properties:

Melting point196-203℃
Purity≥99%
Fineness≧100 mesh
Volatile content≦0.3%
Ash content0.5%
Appearance shapeWhite crystalline powder

 

Ranbar Optical Brightener ob

 

The Role of Ranbar Optical Brightener OB
The whiteness of the paint itself in the production process may not be sufficient. Typically, a certain amount of blue pigment is added to the white paint, a process known as ‘bluing.’ This utilizes the complementary effect of blue and yellow light on the paint surface to enhance its whiteness. However, the resulting white may have limited brightness and appear somewhat dark. In such cases, the addition of Ranbar Paint’s specialized optical Brightener OB is advantageous for improving the overall whiteness and brightness of the paint.

 

Mechanism of Ranbar Optical Brightener OB
Ranbar optical Brightener OB can absorb ultraviolet light and emit blue light. This blue light, when mixed with the yellow light on the surface of the coating film, transforms into white light, causing the coating film surface to tend towards total reflection. This visually enhances the whiteness and brightness of white coatings, making light-colored coatings appear more vivid and dazzling. This significantly improves the overall appearance of the product.

 

UV Absorption for Improved Lightfastness
Another purpose of the optical Brightener OB in coatings is to utilize its ability to absorb ultraviolet light and emit blue light. While enhancing the whiteness of white coatings or the vividness of light-colored coatings, it also reduces the damage caused by ultraviolet rays to pigments in the paint. This, in turn, improves the lightfastness of the paint coating and extends its lifespan when exposed to outdoor and sunlight environments.

 

Ranbar Optical Brightener Powder Photo

 

ModelHeat ResistanceApplicationAddition AmountPackaging
OB196-203°CCoatings, Oil-based<0.08%25KG
OB-1350-353°CPVC, Rigid Plastics<0.08%10/25KG
FP-127216-222°Cplastic<0.08%25KG
KCB210-212°CMainly used for whitening synthetic fibers and plastics<0.08%25KG
KSN-A275-280°CGood weather resistance; mainly used for whitening PET, PA, PAN fibers.<0.08%10/25KG
KSN-C275-280°CModerate weather resistance; mainly used for whitening PET, PA, PAN fibers.<0.08%10/25KG
OB-D300°CSolvent-based optical brightener; Recommended solvents: Xylene, Toluene;0.03-0.05%10KG
OB-W260°COptical Brightener without Fluorescence. For soft plastics.0.03-0.5%25KG
OB-2260°CPaint use; Water-based; Liquid<0.08%25KG

 

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