In the application of temperature-resistant non-stick coatings for kitchen appliances and special decorative coatings, the coatings must withstand long-term high-temperature use while maintaining a high gloss and high finish quality. They also need to have a hardness of ≥5H and excellent high-temperature yellowing resistance. Polyester-modified silicone resin 1062G has further enhanced the hardness and yellowing resistance of the paint film compared to 6038A (hardness ≥ 3H). After curing, the hardness is ≥ 5H, the solid content is 57 ± 1%, the acid value is ≤ 4mgKOH/g, and it can be used as a candidate base material for high-end household appliances' non-stick and decorative coatings.


Why do non-stick coatings for household appliances often have insufficient hardness, yellowing, or adhesion problems during high-temperature curing or long-term use?


Improper curing conditions - 200℃×30min, 250℃×15min, 280℃×10min can all achieve complete curing, but the addition of amino resins can shorten the curing time, but it may cause slight yellowing at high temperatures.


The diluent contains water, sulfur compounds, or pyridine and other impurities, which affect the adhesion, drying, and high-temperature performance of the paint film.


The addition amount of amino resins (10-15% of 1062G) is not precisely controlled. Excessive addition may exacerbate yellowing or affect hardness.


The low acid value system with an acid value of ≤ 4mgKOH/g is more sensitive to acids, bases, and amines, and during storage and use, it is necessary to strictly isolate from such substances.


During coating application, dust, foreign substances, or water are mixed in, causing coating defects and affecting hardness and appearance.


The relationship between curing conditions and performance


Curing method Conditions Performance characteristics Precautions
Standard curing 200℃×30min Hardness ≥ 5H, high gloss, good finish Recommended basic process
Fast curing 250℃×15min Hardness ≥ 5H, high gloss Improve production efficiency
Fast curing 280℃×10min Hardness ≥ 5H, high gloss High-efficiency production line
Add amino resins 10-15% of 1062G Shorten curing time There may be slight yellowing at high temperatures
Selection and construction before need to confirm which conditions?


Condition category Information to be confirmed
Curing equipment Whether it has the ability to bake at 200-280℃ and temperature uniformity
Amino resin usage Whether amino resins are used to shorten curing time (add 10-15%)
Yellowing tolerance Whether the product allows slight yellowing (note when adding amino resins)
Diluent Ensure no water, sulfur compounds, or pyridine impurities
Equipment cleanliness Clean and dust-free, no water, no foreign substances
Storage isolation Away from acids, bases, and amines
Performance goals Hardness (≥ 5H), gloss, finish, non-stick performance, high-temperature yellowing resistance
Which key indicators should be verified?


Verification items Primary function Not replaceable content
Curing hardness (≥ 5H) Verify curing degree and scratch resistance Hardness达标 does not mean non-stick performance is qualified
Coating appearance (gloss， finish) Assess decorative effect Re-evaluate after high-temperature use
High-temperature yellowing resistance Verify color stability after high-temperature use Need to simulate actual usage temperature and time
Adhesion Assess interface bonding quality Re-test after high-temperature use
Non-stick performance Verify functional requirements Need to simulate actual cooking conditions for testing
Common Misconceptions


The amount of amino resin can be adjusted arbitrarily.
The recommended addition of amino resin should be controlled at 10-15% of 1062G. Excessive addition may aggravate the yellowing at high temperatures or affect the performance of the paint film.


Low-temperature long-time conditions can replace the recommended curing conditions.
The recommended curing conditions (200℃×30min, 250℃×15min, 280℃×10min) are designed based on the crosslinking kinetics of the resin system. Curing at temperatures lower than the recommended or for shorter times may affect the final hardness and temperature resistance.


Any diluent can be used.
The diluent must not contain water, sulfur compounds, pyridine or its impurities. Otherwise, it will affect the adhesion of the paint film, drying time and other properties.


The higher the curing temperature, the higher the hardness.
Within the recommended temperature range (200-280℃), the appropriate time combination can achieve the target hardness. Exceeding the recommended range may cause thermal damage to the resin or exacerbate yellowing.


Recommended selection steps


Confirm whether the baking equipment meets the curing requirements of 200-280℃.


Select the appropriate curing conditions (200℃×30min, 250℃×15min or 280℃×10min).


If the curing time needs to be shortened, assess whether slight yellowing is allowed, and decide whether to add amino resin (10-15%) accordingly.


Confirm the purity of the diluent and the cleanliness of the equipment.


Verify the appearance (luster, fullness) and hardness (≥5H) of the coating on a small sample.


Conduct adhesion tests and high-temperature yellowing resistance verification.


Carry out non-stick performance and durability tests based on actual household appliance usage conditions.


Optimize construction parameters and coating design based on the verification results.


FAQ


What are the recommended curing conditions for IOTA-1062G?
Complete curing can be achieved at 200℃ for 30 minutes, 250℃ for 15 minutes, or 280℃ for 10 minutes. The hardness should be ≥ 5H.


Can this product be mixed with amino resins?
Amino resins can be appropriately added, with the addition amount controlled at 10-15% of 1062G. However, after adding amino resins, there will be a slight yellowing at high temperatures.


What does a hardness of ≥ 5H mean?
A pencil hardness of ≥ 5H is currently the highest hardness level in the non-stick coating field. It means that the coating has excellent scratch resistance and can withstand the friction and cleaning during the daily use of household appliances.


Why are resin with acid value ≤ 4mgKOH/g strictly required for storage conditions?
Resin with low acid value is more sensitive to acids, bases, and amines, which will accelerate the curing process and affect the heat resistance and electrical properties. During storage, it should be strictly isolated.


What are the consequences of insufficient curing temperature?
Insufficient curing temperature will result in insufficient crosslinking density, decreased hardness, and significant reduction in heat resistance and non-stick properties.