Soft plastics have much higher requirements for the precipitation resistance and compatibility of f fluorescent brightener than hard plastics. This is also well understood. Soft plastics have good flexibility and often deform when used. If the compatibility of the  fluorescent brightener is not good, and it is dispersed in the plastic in the form of solid particles, rub it and squeeze it. It is easy to precipitate. So which type of optical brightener should be selected for soft plastics?

The whitening and brightening of  fluorescent brightener is the most basic requirement, but today we only talk about compatibility and weather resistance. Considering the application scenarios of soft plastics, some soft plastics need to change color and yellow for a long time, but some soft plastics (such as disposable plastic bags) are thrown away after one use, and the requirements for weather resistance are not high. 

According to the analysis just now, it is recommended that you use the soft plastic optical brightener OB with high weather resistance requirements; the soft plastic optical brightener 127 should be used for disposable soft plastic products. The compatibility of these two optical brighteners is very good, and they can even be added to paint and ink for use. In terms of whiteness, optical brightener 127 is slightly stronger than optical brightener OB, so optical brightener 127 is very suitable for disposable soft plastic products. In terms of weather resistance, the advantage of optical brightener OB is very obvious.