Solubility Issues with Dichlorophenyl Imidazoldioxolan in Hair Tonic
Question
I am using 1% `Dichlorophenyl Imidazoldioxolan` and attempted to dissolve it in 10% `alcohol 95%` by stirring for 5 minutes, but it did not dissolve. It appeared cloudy white, similar to sand grains, and formed a precipitate. I also tried dissolving 1% `Dichlorophenyl Imidazoldioxolan` in 2% `propylene glycol` for 5 minutes, but it remained undissolved as well.
What is the cause of this? Is it possible to dissolve it into a clear liquid? I am making a `hair tonic` and would like it to be transparent.
Answer
The issue you are experiencing with Dandruff-Care™ (Dichlorophenyl Imidazoldioxolan) not dissolving is likely due to an insufficient ratio of solvent to the active ingredient and the lack of heat during the mixing process.
Here are the reasons and solutions to achieve a clear hair tonic:
1. Solvent Ratio
In your tests, the ratio of solvent was likely too low to fully dissolve the powder at room temperature:
- Alcohol 95%: Using only 10% alcohol to dissolve 1% of the powder (a 1:10 ratio) may not be enough.
- Propylene Glycol: Using only 2% PG to dissolve 1% of the powder (a 1:2 ratio) is definitely insufficient for this specific ingredient.
Recommendation: Try increasing the solvent ratio. Start by using a ratio of at least 1:20 (e.g., 1% active in 20% solvent) to see if it clears up.
2. Temperature
Dichlorophenyl Imidazoldioxolan often requires mild heat to dissolve completely and quickly.
- Solution: Heat the solvent (Propylene Glycol or Ethoxydiglycol) to approximately 50-60°C before adding the powder. Stir until completely clear.
3. Maintaining Clarity in Hair Tonic (Water-based)
If your hair tonic is primarily water-based, even if you dissolve the powder in alcohol or PG first, it may precipitate (turn cloudy/sandy) again once you add it to the water phase.
- To keep it clear: You must ensure the final formula has a high enough concentration of alcohol (usually >20-30%) or use a solubilizer to help bridge the oil-soluble active with the water base.
Suggested Mixing Steps for a Clear Tonic:
- Mix Dandruff-Care™ with Propylene Glycol or Ethoxydiglycol at a ratio of at least 1:10.
- Gently heat the mixture to 50-60°C and stir until the liquid is perfectly clear.
- Slowly add this mixture into your main formula. If the main formula is water-based and it turns cloudy, you will need to add a solubilizer or increase the alcohol/solvent content in the overall recipe.
Note: If you prefer not to use high amounts of alcohol, using Ethoxydiglycol as a co-solvent often provides better results for this specific active than Propylene Glycol alone.
Related Products Mentioned
Ethoxydiglycol (e.q. Transcutol)
