Machine dishwashing requires specialized dishwashing detergent due to its unique low-foam, high-temperature method. Using traditional hand-wash detergent in a dishwasher can cause excessive foam, damaging the machine and reducing cleaning efficiency. To enhance dishwasher cleaning and reduce energy consumption, a combination of main wash, rinse aid, and water softener salt is typically used in machine dishwashing detergents.
The main wash needs strong stain removal capabilities, the rinse aid should promote quick drying and shine, and the water softener salt prevents limescale buildup. Key components in the main wash formula include surfactants, polymers, dispersants, oxidants, and enzymes, each crucial for cleaning effectiveness.
1. Surfactants: Alkaline agents, chelating agents, and dispersants play a vital role in cleaning effectiveness. They can constitute over 30% of the detergent, significantly impacting cleaning performance. Common alkaline agents like sodium carbonate, sodium bicarbonate, and sodium silicate provide alkalinity, facilitating the saponification of fatty residues for easier cleaning.
2. Chelating Agents: These bind with calcium and magnesium ions in water, reducing hardness and ensuring efficient cleaning. Common chelating agents like sodium citrate and EDTA salts enhance cleaning performance. Green chelating agents such as sodium citrate, GLDA, and MGDA effectively enhance the cleaning performance of machine-washed tableware detergents, with GLDA and MGDA outperforming sodium citrate.
3. Dispersants: These prevent dirt particles from redepositing on tableware surfaces. Common dispersants like sodium maleic-acid copolymer and sodium polyacrylate play a crucial role in reducing foam height, maintaining foam stability, and providing cleaning performance. Maleic-acid copolymer demonstrates superior cleaning performance compared to polyacrylic acid.
4. Non-Ionic Surfactants: Essential for reducing water surface tension, emulsifying, wetting, and dispersing, non-ionic surfactants like fatty alcohol ethoxylates are crucial components in detergents. Non-ionic surfactants used in machine dishwashing detergents need to have low foaming and high wetting properties. AEO9, XP90, EH9, and PE6400 are effective in reducing foam properties, with PE6400 exhibiting the best defoaming performance.
5. Oxidants: Used to break down stubborn stains like tea and coffee, non-chlorine oxidants such as sodium percarbonate meet eco-friendly standards. These oxidants help oxidize and dissolve tough-to-remove colored stains, ensuring thorough cleaning.
6. Enzymes: Protease and amylase enzymes efficiently break down protein and starch stains, offering an environmentally friendly and effective solution for dishwashing detergent performance enhancement. Enzymes like protease and amylase are particularly effective in breaking down protein and starch-based stains, providing a sustainable and efficient cleaning solution. When selecting enzyme additives, it is essential to choose types with high-temperature tolerance to prevent enzyme deactivation at high wash temperatures.
By incorporating these essential components into the detergent formula, manufacturers can ensure optimal cleaning performance for machine-washed tableware, meeting both efficiency and environmental standards.