The sequestrants are used in detergency in order to reduce the levels of ions in water. With this the properties of these ions are modified and as a result we obtain a greater efficiency of the cleaning processes. They also reduce metals reactivity that over time may degrade the formulations.
The Tetrasodium Glutamate Diacétate (GLDA) is a biodegradable aminopolycarboxylate sequestrant and is obtained from renewable raw materials. It is increasingly being used in detergency thanks to its good complexing capacity and excellent solubility even in strongly alkaline solutions.
During the laundry processes, the applied mechanical energy is high and this allows doses of sequestrant for laundry to be low.
However, the incorporation of GLDA improves the performance of detergents thanks to:
- The lower interaction of the salts with anionic surfactants.
- The inhibition of soap salts.
- The decrease of the affinity of dirt with fabrics.
- The chelation of heavy metals formed by some stains.
- The improvement of stability of the formulations.
- The stabilization of the oxygen releasing substances.
Quimidroga has two grades of GLDA, Aquacid 2014 EX (at 38%) and Aquacid 2015 EX (at 47%).
Efficacy in a laundry powder detergent on oxidisable stains
Tested Detergents:
| Blanco | A 2015EX | |
| LABSA 90% | 16.12 | 16.12 |
| Sodium Silicate | 9.00 | 9.00 |
| CMC | 0.75 | 0.75 |
| Sodium Sulphate | 31.81 | 30.75 |
| Optical brightener | 0.02 | 0.02 |
| Sodium Carbonate | 35.55 | 35.55 |
| Sodium Percarbonate | 5.00 | 5.00 |
| TAED | 1.75 | 1.75 |
| Aquacid 2015EX | – | 1.06 |
| Total | 100 | 100 |
Washing conditions:
- Dose of detergent:5 gm/L
- Washing temperature = 60°C
- Salts: 350 ppm of hardness + 2 ppm copper
- 3 Cycles of 30 minutes
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