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 point | 196-203℃ |
| Purity | ≥99% |
| Fineness | ≧100 mesh |
| Volatile content | ≦0.3% |
| Ash content | 0.5% |
| Appearance shape | White crystalline powder |
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.
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.
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.
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.
| Model | Heat Resistance | Application | Addition Amount | Packaging |
| OB | 196-203°C | Coatings, Oil-based | <0.08% | 25KG |
| OB-1 | 350-353°C | PVC, Rigid Plastics | <0.08% | 10/25KG |
| FP-127 | 216-222°C | plastic | <0.08% | 25KG |
| KCB | 210-212°C | Mainly used for whitening synthetic fibers and plastics | <0.08% | 25KG |
| KSN-A | 275-280°C | Good weather resistance; mainly used for whitening PET, PA, PAN fibers. | <0.08% | 10/25KG |
| KSN-C | 275-280°C | Moderate weather resistance; mainly used for whitening PET, PA, PAN fibers. | <0.08% | 10/25KG |
| OB-D | 300°C | Solvent-based optical brightener; Recommended solvents: Xylene, Toluene; | 0.03-0.05% | 10KG |
| OB-W | 260°C | Optical Brightener without Fluorescence. For soft plastics. | 0.03-0.5% | 25KG |
| OB-2 | 260°C | Paint use; Water-based; Liquid | <0.08% | 25KG |
