What is fluorescent brightener OB-1?
What is fluorescent brightenerOB-1?
Fluorescent brightener OB-1 is an important chemical additive mainly used to
increase the whiteness and brightness of items. Here is a detailed introduction to it:
Basic information:
Chemical name: 2,2'-(ethylenediphenylene)bisbenzoxazole; also known as stilbene bisbenzoxazole.
Chemical formula: C₂₈H₁₈N₂O₂.
Molecular weight: 414
CAS number: 1533-45-5.
CI number: 393.
Analysis of the advantages anddisadvantages of fluorescent brightener OB-1:
Advantages:
Excellent high temperature resistance: It is one of the fluorescent brighteners with the best heat resistance among all current fluorescent brightener products. With a melting point of 350-355°C and being able to withstand a high temperature of 375°C, it can adapt to the high-temperature environment in most plastic processing processes. For plastic products that require high-temperature production, such as rigid PVC, ABS, EVA, polystyrene, polycarbonate, etc., the whitening effect is significant.
High color light intensity: The color light is blue or blue-violet. The heavier the blue light of the brightener, the better the whitening effect, and the less the addition amount. Fluorescent brightener OB-1 has a considerable fluorescence intensity and can effectively neutralize the yellow light in plastic raw materials, resulting in a good whitening effect for products.
Wide application range: It has good compatibility with most polymers and can be widely used in the whitening of chemical fibers such as polyester fiber, nylon fiber, polypropylene fiber, etc., as well as the whitening and brightening of plastic products such as polypropylene plastics and various engineering plastics. It can also be used in the conventional polymerization of polyester and nylon.
High cost performance: It has a relatively low price among brighteners, and the addition amount is small, which can reduce costs for production enterprises.
Stable chemical properties: Insoluble in water, slightly soluble in ethanol, dimethylformamide, benzene, toluene, etc., and has very low solubility in other organic solvents. It is resistant to strong acids and alkalis and has good resistance to sunlight and chlorine bleaching.
Low toxicity: It can be used for whitening plastic products for food packaging and children's toys, and the potential harm to human health is relatively small.
Disadvantages:
Poor weather resistance: Under the same addition amount and temperature and humidity, the migration and precipitation amount is large, and the product is more prone to yellowing and discoloration. The long-term stability is not ideal. If there are high requirements for product stability, such as plastic products exposed outdoors for a long time, fluorescent brightener OB-1 is not suitable.
Poor dispersibility: Compared with some other fluorescent brighteners, the dispersibility of OB-1 is not good enough. In the use process, some special dispersion measures may need to be taken to ensure its uniform dispersion in the plastic matrix.