Wetting Agent IOTA245 Formula Application Technology Analysis | Low Tension Wetting and Re-coat Balance Scheme
Wetting agent IOTA 245-IOTA
1. Core Technical Characteristics of the Molecular Structure
IOTA245 is a polyether-modified organosilicon wetting leveling agent. Through the customized grafting design of the polyether chain segments and the silicon-oxygen main chain, it achieves a rapid reduction in surface tension while avoiding the common compatibility shortcomings of ordinary organosilicon additives. Unlike simple leveling additives, it has three functions: penetration and wetting of the substrate, surface leveling, and moderate smoothness. It spreads rapidly on difficult-to-wet substrate surfaces, eliminating shrinkage, pinholes, and scabbing defects caused by uneven substrate tension. The product's cloud point is stable at 50–60℃, suitable for most water-based resin systems, and has good compatibility with acrylic, polyurethane, emulsion, etc.
2. Key Points of Addition Process and System Adaptation Technology
The recommended addition amount is 0.1%–0.5% of the total formula. It can be added during the grinding stage or the paint mixing stage. The effects of the two addition timings are slightly different: adding it during the grinding stage is more conducive to uniform overall dispersion; adding it later in the paint mixing stage provides more flexibility in surface effect control.
System Adaptation Range: Water-based industrial coatings, water-based wood coatings, water-based varnishes, printing pastes, water-based adhesives, nitrile gloves coatings. For solvent-based systems, compatibility tests must be conducted first to avoid precipitation and loss of gloss before use.
3. Frequent Technical Questions Answered by Formula Engineers
Q: Why is IOTA245 organosilicon additive less prone to re-coat failure?
A: The hydrophilic polyether segments on the molecular chain enhance the anchoring ability of the additive in the paint film, preventing it from continuously migrating to the outer surface. Within the specified addition amount, multi-layer stacking does not form an isolation layer, ensuring inter-layer adhesion.
Q: Will the system's cloud point be affected when it is lower than the process temperature?
A: When the temperature exceeds the cloud point, the additive will precipitate from the water, resulting in a decrease in wetting and leveling effects. For high-temperature curing systems, it is necessary to check the process temperature in advance and, if necessary, conduct a compatibility test by combining with other additives for testing.
4. Combinatorial Development Suggestions
If a stronger smoothness feel is desired, other smoothness additives can be combined for gradient testing; prioritize small-scale tests to determine the addition window to avoid excessive addition that may cause edge shrinkage, bubble stabilization, etc., achieving a balance among appearance, adhesion, and production stability.
