- Epoxy Amine Coatings
Epoxy amine coatings are formulated with epoxy resin and amine resin in a certain ratio. They are widely used as protective coatings for the exterior walls of can lids, can bodies, twist-off caps, and sealing caps. The main properties and advantages of epoxy amine coatings are as follows:
- Clear film appearance
- Good chemical resistance and processability
- Excellent boiling resistance
- Good color fastness upon re-baking
Epoxy amine coatings exhibit high resistance to sterilization, especially in strongly alkaline water with a pH of around 9-10, making them the preferred choice for protecting the exterior walls of can lids. This property is also utilized in packaging latex paints. Epoxy amine films have significantly better water resistance and resistance to blushing during cooking compared to other modified epoxy products. They have excellent heat resistance and are less prone to mechanical abrasion during heat treatment.
Epoxy amine films maintain good color fastness and resist yellowing upon re-baking, making them widely used as protective coatings for the exterior walls of three-piece beverage cans, food cans, twist-off caps, and crown caps. They are particularly useful when the inner wall coating, applied in the last step, could potentially affect the performance of the exterior wall coating.
Epoxy amine coatings also maintain good performance when exposed to corrosive contents that may overflow and potentially attack the exterior wall coating. Due to their excellent adhesion, they can also be used as primer coatings for printing.
Curing of epoxy amine coatings is achieved through thermal polymerization. For mixed products, the recommended peak temperature is 170-180 degrees Celsius, with a maximum heating time of 10 minutes. When higher boiling resistance and chemical resistance are required, a peak temperature of 200 degrees Celsius is recommended.
Epoxy amine coatings are also commonly used as inner wall coatings, especially in beverage cans with mild corrosive contents, such as dairy products and fruit juices.