Surface tension is a phenomenon of interface interaction between liquid and solid, which has important applications in many fields. In order to accurately measure the surface tension, many detection methods have been developed. This article will introduce three commonly used surface tension testing methods, which are peel testing with BOPP single-sided tape, testing with Dyne test pen, and preparing surface tension testing liquid.

1. BOPP single side tape stripping test method

This method uses BOPP single-sided tape to assess the surface tension of the film under test. The operation method is to paste the BOPP single-sided tape on the surface of the film to be measured, then compacted, and finally quickly torn. If the surface tension of the film meets the requirements of use, some force will be required when peeling, and the sound is small; On the contrary, if the surface tension is low, the tape will easily peel off and be accompanied by a noticeable “rustling” sound.

2. Dyne test strokes

This method measures the surface tension of the film by using a Dyne test pen. When the surface tension value of the film meets the requirements, the liquid mark is uniform and there is no break mark where the test stroke has been, and the test liquid will not shrink; On the contrary, the test solution will shrink. If there is shrinkage in one area and not in another, the film treatment is not sufficient. For different materials, you need to choose the appropriate size of the test pen.

Surface tension commonly used 3 detection methods

3. Prepare the surface tension test liquid method by yourself

This method involves preparing the surface tension test liquid by oneself, and using a cotton ball to dip a small amount of the test liquid to be coated on the surface of the film to be measured. The judging method is similar to Dyne test pen method, the uniform liquid marks without broken marks indicates that the surface tension value meets the requirements. It should be noted that the treated film should not be placed for too long, because the longer the time, the surface tension value will gradually decrease. If you need to store the film for a long time, the initial surface tension value should be slightly higher when handling the film.

Taken together, these three commonly used surface tension detection methods provide researchers and engineers in different industries with the means to accurately assess the properties of liquid-solid interfaces. The choice of the appropriate method depends on the specific application requirements and experimental conditions, and the application of these methods will help optimize the liquid wettability, droplet stability, and material coating processes.