The typical addition amount of CMC in laundry detergent is 0.5%-2%, which can be adjusted to 0.1%-5% in special formulations. Data from different sources shows that the reference value for ordinary formulations is about 2%, for products using high-tower spray drying technology it is 1%-4%, and for products only acting as an anti-redeposition agent it is 0.3%-1.0%.
The addition amount is affected by the type of laundry detergent (regular/concentrated, phosphorus-containing/phosphorus-free), the type of fabric being washed (cotton fabrics can be increased to 1%-2%, white fabrics are recommended to be 2%), and the CMC specifications (viscosity, degree of substitution). Adding too much will result in excessively high detergent viscosity, while adding too little will not fully exert its anti-redeposition effect.
Sodium carboxymethyl cellulose mainly acts as an anti-redeposition agent, preventing dirt from redepositing by electrostatically repelling and encapsulating stain particles, while also stabilizing foam, softening fabrics, and reducing skin irritation.
