In the transformation of kitchen appliance temperature-resistant non-stick coatings and high-temperature resistant varnishes to water-based formulations, the coating must meet the requirements of water-based environmental protection, while also achieving high hardness, high gloss, and good resistance to yellowing after being baked at 200-250℃. At the same time, the amount of neutralizer must be controlled to avoid negative impacts on the coating performance. The water-based silicone resin 6850S has an acid value slightly lower than 6830S (15-28 mgKOH/g), and the neutralizer dosage is 2.5-3% of the resin volume. After neutralization, it can be water-dispersed and can be used as a candidate base material for water-based high-temperature resistant varnishes.


Why do water-based silicone varnishes often fail to meet the expected performance during construction or high-temperature use?


The addition amount of the neutralizer dimethyl ethanolamine (2.5-3%) was not precisely controlled, affecting the water solubility and storage stability of the resin.


The water addition ratio exceeded the recommended range, resulting in a low solid content that affected the film thickness and final performance.


Insufficient baking temperature or time led to the coating not fully cross-linking, resulting in a decrease in hardness and temperature resistance.


Using solvent-based additives instead of water-based additives affected the stability of the system and the film-forming quality.


The difference in acid value between 6850S and 6830S (15-28 mgKOH/g vs. 15-30 mgKOH/g) required separate optimization of the neutralization process.


Comparison of key differences between 6850S and 6830S


Comparison item 6850S 6830S
Acid value 15-28 mgKOH/g 15-30 mgKOH/g
Neutralizer dosage 2.5-3% of resin volume 3-3.3% of resin volume
Solid content 49±1% 49±1%
Baking conditions 200℃×30-40min / 250℃×20-25min Same
Recommended application High-temperature resistant coatings, non-stick coatings, varnishes Same
Usage methods and process control


Process step Key parameters Notes
Neutralization Adding 2.5-3% of dimethyl ethanolamine to the resin volume Accurate control of dosage, affects water solubility and storage stability
Dilution Adding about 70% of water to the resin volume (up to 150%) Excessive addition affects solid content and film thickness
Additive selection Using water-based additives Avoid solvent-based additives damaging the system
Baking and curing 200℃×30-40min or 250℃×20-25min Optimal baking temperature 200-250℃
Selection and pre-construction conditions to be confirmed


Condition category Information to be confirmed
Neutralization process Amount of dimethyl ethanolamine added (2.5-3% of resin volume), mixing uniformity
Dilution ratio Initial water addition volume (about 70% of resin volume), maximum water addition ratio (150%)
Baking equipment Whether it has the ability to bake at 200-250℃, temperature uniformity
Additive system Whether using water-based additives
Application scenarios Kitchen appliance non-stick coatings, high-temperature resistant varnishes or others
Performance goals Temperature resistance grade, hardness, fullness, high-temperature yellowing resistance requirements
Common misunderstandings


The less neutralizer, the better
The recommended dosage is 2.5-3% of the resin volume, deviating from this range may affect water solubility and coating performance.


The neutralizer dosage of 6850S (2.5-3%) can be interchanged with 6830S (3-3.3%)
The neutralizer dosage of 6850S (2.5-3%) and 6830S (3-3.3%) is different, it should be used according to their respective recommended amounts.


The more water added, the better
The maximum amount of water that can be added is about 150% of the resin volume, excessive addition will affect solid content and coating thickness and performance.


Low-temperature curing can achieve the same performance
This product is recommended for varnishing, the baking effect at high temperatures (200-250℃) is better, low-temperature curing may not meet the design performance.


Recommended selection steps


Confirm whether there is a baking equipment capable of 200-250℃.


Precisely add dimethyl ethanolamine at 2.5-3% of the resin volume for neutralization.


Dilute with water at a ratio of about 70% of the total resin volume. Adjust up to a maximum of 150% as needed.


Select the corresponding water-based additive system.


Cure at 200°C for 30-40 minutes or at 250°C for 20-25 minutes.


Test hardness, gloss, fullness, and high-temperature yellowing resistance performance.


Optimize the formula and process parameters based on the verification results.


FAQ


What is the neutralizer for IOTA 6850S?
The neutralizer is dimethyl ethanolamine, with an addition amount of 2.5-3% of the resin volume.


What are the differences between 6850S and 6830S?
The acid value of 6850S is 15-28mgKOH/g, and the neutralizer dosage is 2.5-3% of the resin volume, which is slightly lower than 3-3.3% of 6830S.


What is the recommended dilution ratio?
First, add about 70% of the total resin volume of water. This product can be added with up to 150% of the total resin volume of water.


What are the optimal baking conditions?
The optimal baking temperature is 200-250℃. The recommended baking time is 20-25 minutes at 200℃ or 30-40 minutes at 250℃.


What is the main application direction of this product?
It is mainly used in high-temperature resistant coatings, temperature-resistant non-stick coatings for kitchen appliances, and basic resins for special coatings. This product is recommended for baking.