I am currently formulating a liquid laundry detergent and I need help in stabilizing the pH of the detergent.
This is my first time writing here and my first time handling this kind of task (I’ve no experience so I need to learn a lot from people). I’ve been doing a lot of research on how to stabilize the pH of liquid detergents, however, from the past few days, I had no luck. I tried adjusting the ratio of surfactants and foam booster. I also tried adding citrate and triethanolamine, however, pH decreases drastically after the addition of thickener (ex. started at pH 9.22, after addition of salt pH is already at 8.86).
I've been feeling down lately because of this though, I know it’s going to be trial and error however it seems nothing is working.
Any form of help would be much appreciated and any reading or reference recommendations will also be of great help.
Regarding the formulation, I am using the following ingredients for the base:
Linear alkylbenzene sulfate
Sodium lauryl ether sulfate
Caustic soda flakes
I am also adding the following to the formulation:
Salt (for my thickener)
I tried adjusting the ratio of the surfactants, first by increasing their concentrations in the formulation, however, nothing happened. The pH (as is) dropped below 8 at the end of the day (I am targeting a pH of 9 - 10).
I also tried adding citrate and neutralizer to increase the pH, however, as mentioned, pH dropped drastically.
I am planning to decrease the concentrations of the surfactant, though I have a few concerns with this:
1. %active will decrease thus, lowering the cleaning efficiency
2. foam height will decrease
Hope this data helps. Thanks in advance.