Silicone materials are prone to delamination in many cases. Here are some of the main influencing factors:
1. Raw material factors
Impurities and purity:
If there are too many impurities in the raw materials of silicone, or if the purity is not enough, the internal structure of the silicone may be unstable, resulting in delamination during processing or use.
Acid-base imbalance:
If the pH of the silicone material is unbalanced, the silicone material may lose balance due to acid-base erosion, which may cause delamination.
2. Processing process factors
Temperature and pressure control:
During the processing of silicone, if the temperature and pressure are not properly controlled, the internal structure of the silicone may change, causing delamination. For example, too high a temperature may cause the silicone molecular chain to break, and too low a temperature may cause the silicone to fail to fully vulcanize, both of which affect its structural stability.
Cooling and curing:
Silicone needs to be cooled and cured after processing. If the cooling is uneven or the curing is incomplete, it may cause stress inside the silicone or residual unreacted chemicals, which may cause delamination during subsequent processing or use.
Mixing and molding:
During the mixing and molding process of silicone, if the mixing is uneven or the molding pressure is insufficient, it may also cause uneven internal structure of silicone, resulting in stratification during subsequent processing or use.
3. Storage and transportation factors
Long-term storage:
During long-term storage, silicone materials may undergo physical or chemical changes due to environmental factors (such as temperature, humidity, etc.), resulting in unstable internal structure, which in turn causes stratification.
Vibration and shock during transportation:
During transportation, if silicone materials are subjected to strong vibration or shock, their internal structure may change, which in turn causes stratification.
4. Environmental factors for use
Strong light and high temperature:
During the use of silicone materials, if they are exposed to strong light or high temperature for a long time, the molecular structure of silicone may change due to oxidation reaction, which in turn causes stratification.
Frequent bending and stretching:
During the use of silicone materials, if they are frequently bent and stretched, their internal structure may change, which in turn causes stratification.
5. Preventive measures
In order to avoid stratification of silicone materials, the following preventive measures can be taken:
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, ensure uniform cooling and complete solidification.
Strengthen the control of the mixing and molding process to ensure the uniform internal structure of the silicone.
Properly store and transport silicone materials to avoid long-term static and strong vibration or impact.
During use, avoid long-term exposure of silicone materials to strong light or high temperature environments, and reduce frequent bending and stretching.
In summary, silicone materials may cause stratification in many aspects such as raw materials, processing, storage and transportation, and use environment. Therefore, it is necessary to comprehensively consider these factors and take effective preventive measures to reduce the risk of stratification.