Hey all,
I'm having some issues with some pigment agglomeration in a hot pour product. I'm using lecithin coated pigments. There are little speckles of coated TiO2 (and just TiO2, no iron oxides) throughout the cooled product. I'm using both Finsolv TN (wetter) and Cithrol PG23IS (disperser) and I noticed significantly less speckling after the addition of both, but it still remains. Finsolv is in at 5% and the Cithrol is in at 2%. Product is poured just above set temperature.
For proper pigment wetting do you mix pigments with the wetter and then introduce the rest of the product into the pre-wet pigments and disperse, or is adding the pigment wetter to the overall mixture and then dispersing pigments with IKA enough?
While during my searching I found a lot of stuff about why you should wet pigments but not the *how*.
I know I'm asking a lot of questions and I appreciate all you guys' help.
Comments
Most recent formula (rounded percent):
5% cap/cap
5% DC 556
1.5% Tribehenin
6% Ozokerite
1% Ceresin
1% Squalane
1.5% Tridecyl Trimellitate
.75% polyglyceryl-3 beeswax
1% soft jojoba ester
4% hard jojoba ester
2% Cithrol disperser
17% Finsolv (like I said, massive)
0.5% K-82P polyester
10% Vegelight 1214LC
0.5% Nylon-12
0.7% antioxidant
0.1% ascorbyl palmitate
rest is pigments. Supposed to be a concealer stick.
- take a mortar + pestle with roughened surface;
- put a bit of wetting agent and spread it in the mortar (to prevent pigment from adsorbing to surface too much);
- disperse pigment with same quantities of wetting agent.
(edit: so don't use a huge amount of wetting agent with a tiny bit of pigment, but in same quantities or you'll never get a homogeneous end result.)
This is how I used to disperse pigments in the pharmacy.
Good luck!
I would always use a wetting agent when dispersing coated pigments in rough mortars (i.e. don't grind/pulverize them as you might damage the coating which could result in a change of colour.) Maybe this warning is for mica's only or all coated pigments, I'm not sure.
Okay, I'll make a batch without TiO2 to check. If it ends up being TiO2 maybe I can order some NJE pigments from Kobo as the client does not want to go back to silane (wants silicone free product, hence vegelight instead of D5).
@Doreen81
Unfortunately anything I do will eventually need to be mirrored by our large scale production crew and I don't think we have anything like that for large batches
Thanks guys!
Unfortunately IKA is what we are stuck with, we have IKAs of all sizes including giant ones for production that I'm sure management will be hesitant to replace. What is best for pigment dispersion? I know you are a consultant so feel free to brush the question off if it's too in depth to count as free advice
If you were buying new equipment, a ball mill, 3-roll mill or colloid mill would be ideal. Next best would be a Cowles dissolver.