Dispersant NNO-A is an anionic surfactant, chemical composition is naphthalenesulfonate formaldehyde condensate, brown powder, anion, easily soluble in water, resistant to acid, alkali, heat, hard water, and inorganic salt; has excellent diffusibility And protective colloid performance, but no surface activity such as osmotic foaming, and affinity for protein and polyamide fibers, but no affinity for fibers such as cotton and linen.