Optical brightener OB and Optical brightener OB-1 are commonly used in the plastic industry, both of which are universal whitening agents for plastics. From the names, we can see that they are very similar, but what is the specific difference between them?
1. Different appearance:
The appearance of Optical brightener OB is a Similar-white powder. There are two types of Optical brightener OB-1: OB-1 yellow and OB-1 green. The color light of OB-1 yellow is blue purple light, and the color light of OB-1 green is blue light. OB-1 green is commonly used in the plastic industry.
OB OB-1
2. Different melting points:
The melting point of Optical brightener OB is 200 ℃, which is lower than the melting point of Optical brightener OB-1 by 360 ℃ (OB-1 is the most heat-resistant whitening agent), which largely determines the application of the two Optical brighteners. Therefore, OB is not suitable for high-temperature products, and on the other hand, OB-1 can be used for materials that require high-temperature processing.
3. Dispersibility and stability : OB>OB-1
Here, it should be noted that good dispersibility means that the product is more easily soluble and uniform. For example, paint and ink require high dispersibility of Optical brighteners; Good stability refers to the fact that the product is less prone to migration and yellowing in the later stage. For example, some low-quality shoe soles may appear white and pure when first purchased, but soon turn yellow and discolor. This indicates that the stability of Optical brighteners is poor.
Dispersion mainly defines the stability of the application, and products with good dispersibility will have long-lasting whitening effects, and the yellowing of the product will be very slow. Optical brightener OB has better dispersibility and stability than OB-1, which is why it is recommended to use OB in ink coatings because OB is less prone to the yellowing phenomenon that may occur in the early stages of OB-1.
4. The price is the biggest difference between OB and OB-1
OB is much more expensive than OB-1, so customers who can use Optical brightenerOB-1 should try to choose OB-1. For customers with special requirements, such as high-end ink coatings and soft plastics, it is recommended to still use OB-1.
5. Usage:
OB:Soft plastic (PVC) , transparent plastic, film, paint and ink, food containers, children's toys
OB-1：Hard plastic, high temperature, fruit basket
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Post time: Feb-05-2024