In the application of temperature-resistant non-stick coatings for household appliances such as rice cookers, ovens, stoves, and range hoods, the coating must withstand long-term high-temperature use while maintaining high gloss and fullness for decorative purposes, and also must have a pencil hardness of ≥3H and excellent resistance to yellowing. Polyester-modified silicone resin 1038A has a solid content of 59 ± 1%, an acid value of ≤ 9mgKOH/g, and a hardness of ≥ 3H after curing. It can cover a multi-gradient baking and curing window ranging from 250-280℃ and can be used as a candidate base material for temperature-resistant non-stick and decorative coatings for household appliances.


Why do the temperature-resistant non-stick coatings of household appliances often fail in terms of hardness, yellowing, or adhesion during high-temperature curing or long-term use?


Improper selection of curing conditions - 250℃×20min, 270℃×15min, and 280℃×10min can all achieve complete curing, but insufficient curing temperature or time will result in insufficient crosslinking density.


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


Substances such as acids, bases, and amines mixed in accelerate curing or affect heat resistance and electrical properties.


During the coating application process, 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 Applicable scenarios Performance characteristics
Standard curing 250℃×20min Conventional baking process Hardness ≥ 3H, high gloss, good fullness
Fast curing 270℃×15min To improve production efficiency Hardness ≥ 3H, high gloss
Fast curing 280℃×10min High-efficiency production line Hardness ≥ 3H, high gloss
What conditions need to be confirmed before selection and application?


Condition category Information to be confirmed
Curing equipment Whether it has the ability to bake at 250-280℃ and temperature uniformity
Diluent Ensure no water, sulfur compounds, or pyridine and other impurities
Equipment cleanliness Clean and dust-free, no water, no foreign substances
Storage isolation Away from acids, bases, amines, etc.
Performance goals Hardness (≥3H), gloss, fullness, non-stick performance, high-temperature yellowing resistance
Which key indicators need to be verified?


Verification items Primary function Not replaceable content
After-curing hardness (≥3H) Verify curing degree and scratch resistance Not being able to reach hardness standard does not mean non-stick performance is qualified
Coating appearance (gloss, fullness) Assess decorative effect Need to re-evaluate after high-temperature use
High-temperature yellowing resistance Verify color stability under high-temperature use Need to simulate actual use 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 higher the curing temperature, the higher the hardness.
Within the recommended temperature range (250 - 280℃), the appropriate time combination can achieve the target hardness. Beyond the recommended range may cause thermal damage to the resin.


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


Low acid value resins can relax the storage conditions.
Resist systems with an acid value of ≤ 9mgKOH/g are sensitive to acids, alkalis, amines and other impurities. During storage, strict isolation is required.


Recommended selection steps


Confirm whether the curing equipment meets the curing requirements of 250 - 280℃.


Select appropriate curing conditions (250℃ × 20min, 270℃ × 15min or 280℃ × 10min).


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


Verify the appearance (luster, fullness) and hardness (≥ 3H) of the coating on a small sample.


Conduct adhesion tests and high-temperature yellowing resistance verification.


Based on the actual household appliance usage conditions, conduct non-stick performance and durability tests.


FAQ


What are the recommended curing conditions for IOTA-1038A?
Complete curing can be achieved at 250℃ for 20 minutes, 270℃ for 15 minutes, or 280℃ for 10 minutes. The hardness should be ≥ 3H.


What is the main difference between this product and 1062G?
1038A has a hardness of ≥ 3H and is suitable for general anti-yellowing requirements of household non-stick coatings; 1062G has a hardness of ≥ 5H and has better high-temperature anti-yellowing properties, suitable for higher hardness requirements of high-end products.


Why is the quality of the diluent particularly important?
Impurities such as water, sulfur compounds, or pyridine in the diluent can seriously affect the adhesion of the paint film, drying time, and other properties.


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