When using sealing tape, you may encounter situations where the tape's stickiness or adhesion decreases or does not stick. There are many factors that affect the stickiness or adhesion of the tape. For example, the sealing tape is left for a long time and gets damp, which reduces the stickiness. How to avoid and understand the factors that reduce the stickiness or adhesion of the tape are as follows:
1. Electronegativity of the adherend and the adhesive: Electronegativity is the electrostatic force between two substances with opposite charges. Acidic substances generally appear as positive points, while alkaline substances generally appear as negative points. According to the principle of positive and negative attraction, the greater the electronegativity between the adherend and the adhesive, the tighter the adhesion.
2. The degree of acid-base difference between the adherend and the adhesive: The degree of acid-base difference refers to the size of the difference in pH values of the two substances. The greater the difference, the better the bonding.
3. High temperature: Using sealing tape in a high temperature environment will slowly reduce the stickiness over time, because high temperature will destroy the essential nature of ordinary sealing tape, thereby reducing its adhesion.
4. Low temperature or deep cold: When the temperature reaches -10℃, the adhesiveness of the sealing tape will also be affected.
5. Moisture or water immersion: Moisture affects the adhesive strength in two ways. The tape will lose its strength and hardness due to hydrolysis in a hot and humid environment, and may even liquefy in severe cases. Water will also penetrate into the adhesive layer and replace the adhesive at the bonding interface, directly affecting the factors that reduce the adhesive strength of the tape.
