Liquid Hand Soap Formulation Questions

Hello All! I've been testing liquid hand soap/body wash formulations and have nailed down a formulation that performs to my liking (with various fragrance oils - it's thick, clear, foamy, soft). 

Here is an overview of the formulation:

-SLS (20%)
-SLES (5%)
-Coco Betaine (5%)
-Decyl Glucoside (2%)
-Fragrance (0.5%)
-Sodium Chloride (1.5-2%)
-Chamomile Extract (0.5%)
-Aloe Vera Extract (0.5%)
-Optiphen Plus Preservative (0.5%)
-Water (64%)


Here are my questions

1) Water: Do I need to use "deionized" water? I'm currently using distilled. Is this okay?

2) Chelator: I don't have a chelator in the formula. Will this cause an issue? I'm debating adding Tetrasodium Glutamate Diacetate .

3) Fragrance: Is there a trick for knowing what types of fragrance oils perform well in surfactant systems? I find that some oils impact thickness & haziness. The biggest issue I experience is FOs thinning out a formulation.

4) Solubility: What can I do to improve solubility of the fragrance/surfactants? Does heat help to dissolve surfactants?

5) Are there any other obvious ingredients I should be adding to help improve the stability/performance?

Comments

  • AbdullahAbdullah Member
    edited January 11
    MSPdude92 said:
    Hello All! I've been testing liquid hand soap/body wash formulations and have nailed down a formulation that performs to my liking (with various fragrance oils - it's thick, clear, foamy, soft). 

    Here is an overview of the formulation:

    -SLS (20%)
    -SLES (5%)
    -Coco Betaine (5%)
    -Decyl Glucoside (2%)
    -Fragrance (0.5%)
    -Sodium Chloride (1.5-2%)
    -Chamomile Extract (0.5%)
    -Aloe Vera Extract (0.5%)
    -Optiphen Plus Preservative (0.5%)
    -Water (64%)

    Here are my questions

    1) Water: Do I need to use "deionized" water? I'm currently using distilled. Is this okay?
    no

    2) Chelator: I don't have a chelator in the formula. Will this cause an issue? I'm debating adding Tetrasodium Glutamate Diacetate .
    no. But it is strongly advised to use chelating agent.
    H
    3) Fragrance: Is there a trick for knowing what types of fragrance oils perform well in surfactant systems? I find that some oils impact thickness & haziness. The biggest issue I experience is FOs thinning out a formulation.
    i have made such product too and cant get enough viscosity,i don't know how you did. One good way is to remove decyl Glucoside.

    4) Solubility: What can I do to improve solubility of the fragrance/surfactants? Does heat help to dissolve surfactants?
    just mix it. It will work fine.

    5) Are there any other obvious ingredients I should be adding to help improve the stability/performance?
    use chelating agent and a conditioner instead of those extracts.
  • @MSPdude92 Since you're using anionic surfactants (especially SLS), it's necessary to add a chelating agent. Also, to improve the solubility of your fragrance, you could make a premix with Decyl glucoside and add the premix to the batch; nevertheless, if your fragrance is "too heavy", you might still have some issues like loss in viscosity and haziness. Either you ask your fragrance supplier to rework the fragrance to be more compatible with your base, or you can add a solubilizer (like polysorbate). 
  • PerryPerry Administrator, Professional Chemist
    1. Distilled water is fine.
    2. Probably don't need one if you can pass a preservative efficacy test
    3. The trick is test it and see. No shortcuts. 
    4. For fragrance a solubilizer like Polysorbate 20 or Oleth 40 can help. Yes, heat helps dissolve surfactants.
    5. Maybe a cationic polymer like Polyquaternium 7 or 10 or Guar. But it depends on what performance characteristic you're trying to improve.
  • Thanks for the quick responses!
  • @ketchito decyl Glucoside has pH above 10. Is it ok to mix FO with something in such high pH? 
  • @Abdullah I don't think there's a big risk, if you fear for hydrolisis, as long as you don't have your mixture sitting for too long (hydrolisis takes time). Also, high viscosity of decyl glucoside restricts/delays difussion, and the more hydrophobic components of the fragrance would go into decyl glucoside's micelles. 
  • ketchito said:
    @Abdullah I don't think there's a big risk, if you fear for hydrolisis, as long as you don't have your mixture sitting for too long (hydrolisis takes time). Also, high viscosity of decyl glucoside restricts/delays difussion, and the more hydrophobic components of the fragrance would go into decyl glucoside's micelles. 
    Thanks
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