Optical brighteners OB and OB-1 are two brighteners that are often confused with each other. Both are used to brighten and mask the yellow color inherent in the product being used, and are used to improve color to make the product look whiter and brighter, but they are suitable for different types of materials, so it is important to understand the details and differences between them before choosing. difference.
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Optical brightener OB is a milky white powder with the molecular formula C26H26N2O2S. Optical brighteners have a wide range of applications. Fabric whitening is one of them. Plastics and other materials have a certain degree of yellow, making them look dull and dull. Light, in order to increase the brightness of the material, the optical brightener OB can be added to the plastic. Similar applications are also made for fabrics. Other colorants are used with the optical brightener to obtain the desired color and hue in the material. . Optical brighteners are easy to use on plastics because they have a high melting point, which helps them mix easily with molten plastic.
The molecular formula of fluorescent whitening agent OB-1 is C28H18N2O2. There are two colors of OB-1, one is yellow and the other is green. The yellow color is blue-violet light and the green color is blue light. Most plastic industries The one used is the green OB-1. Whitening agent OB-1 also has similar effects to OB, but has different chemical formulas and applications. It can also be used in textiles and plastics to increase the whiteness of products. The final whiteness that can be obtained by using OB-1 is Light reddish-blue effect.
One of the main differences is that the products that can use OB and OB1 are determined based on their melting points, where the melting point of OB is smaller than OB1, and the whitening agent OB-1 has a high melting point of about 360 degrees, so OB is not suitable for high-temperature products, and the other On the one hand, OB-1 can be used on materials that require high-temperature processing.
The melting point of optical brightener OB is 200 degrees, which is lower than the melting point of optical brightener OB-1, which is 360 degrees (OB-1 is the most high-temperature-resistant whitening agent). This largely determines the difference between the two Application of optical brighteners.
Dispersion mainly defines the stability of application. Products with good dispersion will have a long-lasting whitening effect, and the yellowing of the product will be very slow. Optical brightener OB has better dispersion and stability than OB-1, which is why it is recommended to use OB in ink coatings, because OB is not prone to the yellowing phenomenon that may occur in the early stage of OB-1.
When optical brighteners are used on a large scale, price becomes the decisive factor in deciding the choice. OB is much more expensive than OB-1, and most manufacturers choose the latter instead of the former because it is cheap. But special applications such as special ink coatings require OB to be manufactured, so innovation and R&D activities are looking for more affordable and effective OB alternatives.
Optical brighteners have many applications. OB and OB-1 are important for a range of their applications. From a commercialization perspective, characteristics such as dispersion and stability are very important. However, before making a selection, it is necessary to Be careful with the details and differences between OB and OB-1.
Optical brightener OB and Optical Brightener OB-1 are brightening agents often confused with each other. Both are used for brightening but on different types of materials. Therefore, it is essential to understand the details and differences between them before selecting.
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Optical brightener OB is a chemical substance mainly used to improve the optical properties of polymers, especially in enhancing the white or bluish-white appearance of products. Optical Brightener OB is a thiophenebenzoxazole compound with a large molecular weight and a specific chemical structure, which allows it to absorb light and emit blue-white fluorescence under ultraviolet irradiation, thereby achieving a whitening effect.
Fluorescent brightener OB has a wide range of applications. It can be used not only in thermoplastics such as PVC, PS, PE, PP and ABS, but also in a variety of materials such as coatings and printing inks. In addition, OB also has excellent heat resistance and chemical stability, allowing it to remain active during high-temperature processing and not easily decompose or lose effectiveness.
In terms of specific technical parameters, the CAS number of optical brightener OB is -64-5, the molecular formula is C26H26N2O2S, and the molecular weight is approximately 431g/mol. It usually appears as light green powder, with a melting point ranging from 198 to 203°C and a purity of ≥98%.
In general, optical brightener OB is an efficient optical brightener that improves the appearance of the polymer substrate by absorbing ultraviolet light and emitting blue-white fluorescence. It also has good thermal and chemical stability. Suitable for a variety of industrial application scenarios.
OB has better dispersion and stability than OB-1, which makes OB more recommended in applications such as ink coatings because it is less prone to early yellowing problems.
The price of OB is usually higher than that of OB-1. The cost of OB-1 is lower and suitable for large-scale applications.
OB-1 has good heat resistance, light resistance and chlorine bleaching resistance. It is insoluble in water, but slightly soluble in certain organic solvents, such as ethanol, dimethylformamide, benzene and toluene.
There are significant differences in the specific chemical composition of optical brighteners OB and OB-1. The chemical name of optical brightener OB is 2.5-bis(5-tert-butyl-2-benzoxazolyl)thiophene, with CAS number -64-5 and its molecular formula is C26H26SO2N2. The main component of Optical brightener OB-1 is distyryl bisbenzoxazole, with CAS number -45-5.
In addition, from the molecular formula point of view, the molecular formula of OB is C26H26N2O2S, while the molecular formula of OB-1 is C28H18N2O2, which further confirms the difference in chemical structure between the two. These differences lead to differences in their physical and chemical properties, such as solubility, melting point, etc.