The problem of poor curing of silk-screen silicone may be caused by many factors. Here are some targeted solutions:
1. Fabric factors and solutions
Fabric material: The surface of fabrics such as nylon, polyester, and carbon cloth is relatively slippery, and silk-screen silicone is difficult to penetrate into the fabric. It is just suspended on the surface, and the adhesion is insufficient after curing.
Solution: Use a special treatment agent or silicone primer to enhance the adhesion between silicone and fabric.
Fabric poisoning: Black fabrics may contain environmentally unfriendly heavy metal elements such as tin, lead, and sulfur. These elements may cause silk-screen silicone to be poisoned, resulting in non-curing or dry surface and not dry inside.
Solution: Replace fabrics that do not contain these harmful elements, or choose silk-screen silicone with anti-poisoning properties. At the same time, control the temperature during the heating process to avoid carbonization of the fiber fibers on the surface of the fabric.
2. Silicone and curing agent factors and solutions
Silicone aging: If silicone is stored for too long, it may have problems such as poor hardening and slow curing.
Solution: Use fresh, unexpired silicone to ensure the performance and quality of silicone.
Insufficient or improper addition of curing agent: The amount of curing agent added is crucial to the curing quality and speed of silicone. If too little curing agent is added, the silicone will not be completely cured; if too much is added, it may be counterproductive and extend the curing time.
Solution: Accurately add curing agent according to the ratio of silicone and curing agent (generally 10:1,100:2 or 1:1), and avoid blindly increasing the amount of curing agent to speed up the curing speed.
3. Process factors and solutions
Insufficient temperature: Silicone requires a certain temperature to complete the curing process. If the ambient temperature is too low, it will extend the curing time and reduce the quality.
Solution: Increase the temperature of the curing environment to ensure that the silicone can be cured at a suitable temperature.
Excessive humidity: The curing process of silicone requires a certain dry environment. If the ambient humidity is too high, it will slow down the curing speed or fail to cure.
Solution: Reduce the humidity of the curing environment to ensure that the silicone can be cured in a dry environment.
4. Other factors and solutions
Uneven stirring: If the silk screen silicone is uneven during the stirring process, it may cause poor curing.
Solution: When stirring the silicone, ensure that it is stirred evenly to avoid local poor curing.
Improper use of catalyst: In some cases, a catalyst may be needed to promote the curing of silicone. If the catalyst is used improperly, it may also lead to poor curing.
Solution: Add the catalyst accurately according to the instructions and proportions, and avoid excessive use.
In summary, solving the problem of poor curing of screen printing silicone requires multiple aspects, including choosing the right fabric and silicone, accurately adding curing agent and catalyst, and controlling process parameters. At the same time, it is also necessary to pay attention to the storage time and environmental conditions of the silicone to ensure its performance and quality.