To extend the operation time of machine-printed silk-screen silicone, you can start from controlling the ambient temperature, adjusting the curing agent ratio, choosing the right type of silicone, and optimizing the operation method. The following are specific instructions:
Controlling the ambient temperature: Lowering the ambient temperature can slow down the curing reaction of silicone, thereby extending the operation time. Theoretically, the operation time can be doubled for every 5 degrees lowering. During the operation, the operation time can be effectively extended by using cooling equipment (such as fans, air conditioners) or choosing to operate in a lower temperature environment.
Adjusting the curing agent ratio: The curing agent ratio directly affects the curing speed of silicone. Reducing the amount of curing agent can extend the operation time, but it should be noted that it should not be lower than the minimum effective ratio, otherwise the silicone may not be completely cured or the performance may be degraded. In actual operation, the optimal ratio can be determined through experiments to achieve the purpose of extending the operation time.
Choose the right type of silicone: Different types of silicone have different curing characteristics and operation times. Choosing a silicone type with a longer operation time can meet the need to extend the operation time. For example, you can choose a slow-drying organic silicone designed for extended operation time, or choose an addition-type liquid silicone (the operation time is 30-40 minutes at normal temperature, and can be further extended by adjusting the ambient temperature).
Optimize the operation mode:
Batch mixing: Mix the silicone and curing agent in batches to avoid mixing too much at one time, which may cause some silicone to cure prematurely.
Quick use: Use as soon as possible after mixing to reduce the residence time of the silicone in the mixed state.
Vacuum degassing: After the silicone and curing agent are mixed, use a vacuum degassing machine to remove bubbles to reduce the impact of bubbles on the curing reaction, thereby indirectly extending the operation time.