Physical Properties

• Appearance: Light brown to brownish-yellow powder, slight characteristic odor, uniform in particle size, no visible impurities, good fluidity under dry conditions.
• Melting Point: No obvious melting point; decomposes at temperatures above 300 °C without melting phenomenon.
• Boiling Point: Decomposes before boiling under normal atmospheric pressure; thermal decomposition occurs at high temperatures above 300 °C.
• Solubility: Highly soluble in water of any hardness, solubility increases with temperature; slightly soluble in ethanol; insoluble in non-polar organic solvents such as acetone and benzene.
• Density: 1.05-1.10 g/cm3 (20 °C, 1% aqueous solution); bulk density 450-500 kg/m3.
• Optical Activity: No optical activity, no chiral center, belongs to polymer compound with no racemic mixture.
• Moisture Absorption: Hygroscopic, prone to absorbing moisture and caking when exposed to air for a long time, especially in high humidity environments.
• pH Value: 7.5-9.0 (1% aqueous solution, 20 °C); viscosity: 300-500 mPa·s (1% aqueous solution, 20 °C); surface tension: (71±1)×10?3 N/m.

Chemical Properties

• Chemical Category: Aromatic sulfonate polymer, anionic surfactant, also known as Dispersant NNO, Sodium methylenedinaphthalene disulphonate; belongs to naphthalene sulfonate formaldehyde condensate series.
• Stability: Stable under normal temperature and pressure (sealed); resistant to acid, alkali, hard water and inorganic salts; stable in dry environment, easy to agglomerate when absorbing moisture; incompatible with cationic dyes or surfactants.
• Acid-Base Property: Neutral to weakly alkaline; pH value of 1% aqueous solution is 7.5-9.0, no obvious acid-base reaction under normal conditions.
• Decomposition: Decomposes at temperatures above 300 °C; no obvious hydrolysis under normal storage conditions; stable to heat and has excellent thermal stability.
• Photostability: Relatively stable to light; long-term exposure to strong ultraviolet light will not cause obvious discoloration or decomposition; can remain stable in dry and dark environment for a long time.
• Reactivity: Has excellent dispersibility and protective colloidal properties, no penetrating or foaming surface activity; has affinity for protein and polyamide fibers, no affinity for cotton and hemp fibers; can be used with anionic and nonionic surfactants; has low toxicity and non-flammable, non-explosive under normal conditions.

Chemical Structure

Applications

• Dye industry: Mainly used as dispersant for disperse dyes, vat dyes, active dyes and acid dyes, with excellent grinding effect and dispersing power, which can make dyes more bright and uniform in coloring.
• Construction industry: Used as high-efficiency water-reducing agent for concrete, which can reduce water demand, improve concrete fluidity and strength, and is widely used in highways, bridges, dams and other projects.
• Textile industry: Used as dispersant in textile printing and dyeing, which can prevent dye particles from agglomerating, and is suitable for dyeing of silk/wool interwoven fabrics to avoid dyeing on silk.
• Other industrial fields: Used as stabilizer in rubber industry, auxiliary tanning agent in leather industry, dispersant in papermaking, pesticide and carbon black industry; also used as water treatment agent and oil drilling additive.
• Fine chemical field: Used as raw material for compound admixtures such as pumping agent and retarding superplasticizer, and can be matched with expansion agents and fly ash to improve product performance.

Storage & Handling

• Storage: Store in a sealed container in a cool, dry, well-ventilated warehouse; protect from sunlight, heat, and moisture; keep away from cationic substances, strong oxidants and food, and avoid mixed storage.
• Temperature: Room temperature (≤30 °C) for long-term storage; avoid high temperatures and rapid temperature changes; shelf life 12 months under proper storage conditions.
• Packaging: Sealed plastic drum or woven bag with inner plastic lining (25kg/650kg), moisture-proof and sealed to prevent moisture absorption and caking; small packages can use sealed aluminum foil bags.
• Precautions: Operate in a well-ventilated environment; avoid inhaling dust and direct skin/eye contact; wear protective gloves, goggles and dust mask during operation; rinse with plenty of clean water immediately if contacted accidentally; dispose of waste in accordance with industrial waste regulations; light load and light unload during transportation to avoid package damage.

Description