1、 Molecular structural characteristics

Nylon film, also known as polyamide film, is a polymer material composed of polyamide molecules. Polyamide molecules contain amide groups, which are polar and can interact with water molecules. However, not all polyamide molecules can fully crystallize during the production process, and there are also some non crystalline amide base functional groups present. These amorphous amide groups can coordinate with water molecules, which means they have water absorption properties and can absorb highly polar water molecules.

2、 Chemical properties influence

Hydrophilicity: The amide group is hydrophilic, which gives the nylon film a certain affinity for water and makes it easy to absorb moisture in humid environments.

Moisture absorption mechanism: Non crystalline amide groups coordinate with water molecules to form hydrogen bonds, thereby absorbing and retaining moisture. This moisture absorption process is reversible, and as the environmental humidity decreases, the moisture in the nylon film will gradually be released.

3、 Environmental factors have an impact

Humidity: Environmental humidity is an important factor affecting the moisture absorption of nylon film. In humid environments, nylon film is more prone to absorbing moisture, leading to size changes, performance degradation, and other issues.

Temperature: Although the direct effect of temperature on the moisture absorption of nylon film is relatively small, high temperature can accelerate the movement of water molecules, promote the interaction between nylon film and water, and thus increase the moisture absorption.

4、 Performance in practical applications

In practical applications, nylon film may encounter a series of problems after absorbing moisture, such as inaccurate overprinting caused by size changes, insufficient composite strength due to surface water film, and foaming. In addition, the moisture absorption of nylon film may also affect its barrier and airtightness, reducing product quality.

5、 Solution measures

To reduce the impact of the moisture absorption of nylon film on its application, the following measures can be taken:

Control environmental humidity: When storing and using nylon film, try to keep the environment dry and avoid prolonged exposure to humid environments.

Pre use drying treatment: Dry the nylon film before use, such as using an oven or dryer to remove moisture.

Sealed packaging: Store the nylon film in a sealed packaging to prevent moisture from entering the air.

Choose nylon film with good water resistance: When selecting nylon film, you can choose products with better water resistance to reduce the impact of moisture absorption on performance.

In summary, the reason why nylon film is prone to moisture absorption is mainly related to its molecular structure and chemical properties, as well as being affected by factors such as environmental humidity and temperature. In practical applications, corresponding measures need to be taken to reduce the impact of moisture absorption on performance.