Disodium methylene dinaphthalenesulfonate
Synonyms
Disodium methylenebisnaphthalenesulphonate;
Naphthalenesulfonic acid, methylenebis-, disodium salt;
Category
Anionic Surfactant
> Sulfonate
>> Aryl Sulfonate
>>> Naphthyl Sulfonate
>>>> Naphthalenesulfonic acid - Formaldehyde Polymer
Chemical Numbering System
CAS: 26545-58-4
EINECS: 247-785-8
Molecular Formula & Molecular Weight
Molecular Formula: C21H15Na2O6S2; C21H17O6S2.Na2
Molecular Weight: 473.45
Structure
Properties
Appearance (1), powder.
Solubility soluble in water.
Stability stable.
Risk Solid form: flammable material; irritation, moderate irritation to skin, eye, respiratory. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.
GHS label: 
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent dispersing, emulsifying, wetting, permeating, hydrotropic abilities.
Synthesis
Naphthalenesulfonic acid and formaldehyde react through the polycondensation reaction, then sodium hydroxide or sodium carbonate neutralizes, finally obtain product.
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Solid |
|
|
Actives, %, ≥ |
85.0 |
|
pH (25°C, 1%) |
7.0 - 9.5 |
Test Methods
(1), Actives
(2), pH
GB/T 6368 Surface active agents -- Determination of pH of aqueous solution - Potentiometric method
ISO 4316 Surface active agents -- Determination of pH of aqueous solutions -- Potentiometric method
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Solid |
|
|
Heavy metals (as Pb), mg/kg, ≤ |
20 |
|
As, mg/kg, ≤ |
3 |
Test Methods
(1), Heavy metals (as Pb)
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30799 The test method of food detergents -- Determination of heavy metals
(2), As
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30797 The test method of food detergents -- Determination of total arsenic
3, Further explanation
(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.
(b), Used in cosmetics, should be test for harmful substances; or furtherly test for microorganisms.
Major Uses
1, Typical applications
Use as dispersing agent.
Use as wetting agent.
2, Dye
Use as dispersing agent, leveling agent.
3, Personal care products
Stabilizer, hydrotrope in personal care products.
Manufacturers
Update: 20131025(1); 20170504(2);