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Sodium dodecyl diphenyl ether disulfonate is a chemical, chemical formula is C24H32O7S2Na2. Each molecule contains two negative charges, the dispersion of large, in the electrolyte solution solubility is large, strong acid, alkali and salt solution are high stability. Molecular weight, with strong adsorption capacity, the preparation of latex high efficiency, low cost; latex particle size distribution narrow and uniform. Thermal stability, in the 80-120 ℃ temperature conditions are still suitable for emulsification polymerization, without loss of surface activity. Soluble in water and hydrochloric acid, alkaline solution, insoluble in mineral oil and xylene.