Inorganic salt additives (1) Phosphate. There are sodium orthophosphate, disodium hydrogen phosphate, sodium difluorophosphate and sodium tripolyphosphate. The most commonly used in washing powder is sodium tripolyphosphate. The multivalent metal ions in sodium tripolyphosphate have strong integration ability and can complex insoluble multivalent metal cations into soluble complex ions. For example, it can complex calcium and magnesium ions in water to make them It will not be deposited on the fabric, which greatly improves the cleaning efficiency of detergent active substances. Sodium tripolyphosphate also has the functions of dispersing, emulsifying and rubberizing fine inorganic particles or fat droplets, which can improve the suspension ability of dirt and prevent dirt from re-settling to the fabric, thus improving the cleaning effect of the detergent. Since sodium tripolyphosphate contains 6 crystal waters, it is not easy to absorb water, so the washing powder can maintain good fluidity and granularity, making the finished product dry and easy to package, without causing dust, moisture absorption, adhesion and other undesirable phenomena.

2) Sodium silicate. It can play a coordinated role when used with other additives. Has good cleaning effect. It forms a thin protective layer on the metal surface, inhibiting the corrosion of the phosphates in the washing powder on the metal surface of the washing machine. The aqueous solution of sodium silicate has the ability to suspend, disperse and emulsify the dirt and solid particles in the solution during the washing process, and can prevent dirt from being deposited on the fabric again. After hydrolysis of sodium silicate aqueous solution, hydroxyl groups can be produced to maintain a certain pH value of the solution. This buffering effect can save the amount of surfactant in detergents. (3) Pure shouting. It can saponify fat dirt and remove dirt, but it is not advisable to add too much to the washing powder to avoid damaging the fabric during washing. (4) Sodium sulfate. It is an important filler in laundry detergent, which can reduce product prices and reduce the critical micelle concentration of detergent active substances. It can exert a cleaning effect when the surfactant concentration in laundry detergent is low. (5) Peroxysate. It mainly uses the active oxygen it releases to oxidize stains. As a stain remover, it can remove rust and other stains. Sodium percorate is commonly used in laundry detergent, which contains 10.38% active oxygen.

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