There are many reasons why silicone materials are prone to delamination during processing. Here are some of the main reasons and their detailed explanations:
1. Raw material problems
Impurity content:
If too many impurities are mixed into the silicone raw materials, these impurities may affect the stability of the internal structure of the silicone, resulting in delamination during processing.
Acid-base imbalance:
If the pH of the silicone material is unbalanced, or if it is eroded by acidic and alkaline substances during use, it may also cause the silicone material to lose balance and then delamination.
2. Processing process problems
Improper temperature and pressure control:
During the processing of silicone, if the temperature and pressure are not properly controlled, it may cause changes in the internal structure of the silicone, resulting in delamination. For example, too high temperature or too high pressure may have an adverse effect on the structure of the silicone.
Uneven cooling:
Silicone needs to be cooled and shaped after processing. If the cooling is uneven, it may cause stress inside the silicone, which may be released during subsequent processing or use, resulting in delamination.
Frequent bending and stretching:
During the processing, if the silicone material is frequently bent and stretched, it may cause changes in its internal structure, resulting in delamination.
3. Storage and transportation issues
Long-term storage:
Some thermally conductive silicone products, such as silicone thermal potting glue, thermally conductive adhesive glue, etc., are filled with a large amount of thermally conductive fillers (such as zinc oxide, aluminum oxide, etc.) inside. These fillers may be affected by gravity during long-term storage and may undergo sedimentation and stratification to varying degrees.
Vibration during transportation:
During transportation, if the silicone material is subjected to strong vibration or impact, it may cause changes in its internal structure, thereby causing stratification.
4. Prevention and solution measures
Control the quality of raw materials:
Select high-quality silicone raw materials and strictly control their impurity content and pH balance.
Optimize the processing process:
Reasonably control the temperature and pressure during the processing to ensure uniform cooling. At the same time, avoid frequent bending and stretching of silicone materials during processing.
Proper storage and transportation:
For products that are prone to sedimentation and stratification, such as thermally conductive silicone, they should be properly stored and avoid long-term static storage. During transportation, necessary anti-vibration measures should be taken to reduce the impact of vibration on silicone materials.
Quality inspection and monitoring:
During the processing and use of silicone materials, quality inspection and monitoring should be carried out regularly to promptly discover and deal with potential stratification problems.
In summary, the reasons why silicone materials are prone to delamination during processing involve multiple aspects such as raw materials, processing, storage and transportation. In order to prevent the occurrence of delamination problems, it is necessary to start from these aspects and take effective prevention and solution measures