JIS Reference Liquid Detergent Considering the Characteristics of Commercially Available Liquid Detergents

In recent years, Japan has been moving away from powder detergents to liquid detergents, but only powder types have been set as standard indicator detergents for JIS detergency tests. Therefore, optimizing the liquid reference detergent composition, the standard model for commercial liquid detergents in the JIS K 3362 revision for household synthetic detergents, was studied based on the detergency and mechanism of commercial liquid and powder detergents. A JIS standard liquid composition was proposed based on the AATCC liquid detergent composition (the 2003 AATCC standard reference liquid laundry detergent), and detergency evaluations were conducted using a Terg-O-Tometer using natural collar dirt-soiled cloth and various commercially available soiled cloths. As a result, in the cleaning experiment using collar dirt-soiled cloth, the new JIS liquid reference detergent showed the same detergency as the conventional JIS powder detergent and commercial liquid detergents. It also showed the same detergency as commercial liquid detergents for artificial sebum stains, indicating that it is suitable as an indicator detergent for commercial liquid detergents. However, it was confirmed that there are some points to note, such as the fact that liquid detergents have a weaker alkaline component and, therefore, have a lower detergency for artificial sebum stains than powder detergents and that the new JIS reference liquid detergent has a higher cleaning power for triacylglycerol stains than commercially available liquid and powder detergents due to their high surfactant concentration.