Is there problem with my lactic acid or the information about SPDMA neutralization from supplier?
Suppliers like Evonik say that stearamidopropyl dimethylamine needs 0.27g lactic acid(88% solid) to neutralize 1g SPDMA to pH 3.5-4.5 but in my experience 5g lactic acid (80% solid) is required to neutralize SPDMA to pH 4.3. does it means my lactic acid is more diluted and doesn’t have 80% solid as supplier says or there is something else i am messing?
First added 70% of water water 80°c
Then added SPDMA 1%
Then added lactic acid 5% until pH down to 4.3
Then added fatty alcohol 2%
Then added other water And preservative.