I'm looking to add a "moisturizing" component to a powdered hand wash. Since it's a rinse-off cleanser I know the traditional humectants/emollients/etc. won't be of much use so I want to go with some kind of refatting agent that won't kill the foam. I've already included a cationic polymer which is helping, but would like to take it a step further.
My problem is that all the options I've found need some kind of heat (either to melt the granules or turn a paste into a liquid) before they can be incorporated in a formula. Lamesoft, Tegosoft, etc. all seem to say the same thing. There's a product out there now that has glyceryl oleate sprayed onto it but the sensorials are pretty rough (like sandpaper); which I can only assume is from it hardening back up after returning to room temperature.
Are there any low viscosity liquid refatting agents that I could easily spray onto a powder without heating it up? Or other water soluble esters in powder form that don't need heat?
Could sorbitan sesquicaprylate be a good option here? The data sheet for Antil Soft SC says its low viscosity but I'm not sure if it's actually going to do what I'm hoping it will do.
Thanks so much!