Naphthenic Acids, Magnesium Salts
Synonyms
Magnesium naphthenate;
Naphthenic acid, magnesium salt;
Category
Anionic Surfactant
> Carboxylate
>> Cyclic Carboxylate
>>> Alicyclic Carboxylate
>>>> Naphthenate (Petroleum acid Salt)
Chemical Numbering System
CAS: 68424-71-5
EINECS: 270-317-9
Molecular Formula & Molecular Weight
Molecular Formula: N/A
Molecular Weight: N/A
Structure
Properties
Appearance (1), solid; (2), yellow-brown liquid.
Solubility insoluble in water, soluble in petroleum ether, benzene.
Stability stable.
Risk Solid form: flammable material; irritation, irritation to skin, eye, respiratory system. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.
GHS label: 
Animal Toxicity
Table 1 Animal toxicity values
|
rat oral LD50 |
9140mg/kg[1] |
|
mouse oral LD50 |
6450mg/kg[1] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent emulsifying, dispersing, lubricating, anticorrosive, solubilizing, antirust abilities.
Synthesis
Obtained that sodium naphthenate reacts with magnesium chloride.
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Solid / Liquid |
|
|
Actives, %, ≥ |
45.0 - 85.0 |
|
Mg, % |
2.0 - 12.0 |
Test Methods
(1), Actives
GB/T 13173 Surface active agents -- Detergents -- Testing methods
GB/T 5173 Surface active agents and detergents -- Determination of anionic-active matter by direct two-phase titration procedure
ISO 2271 Surface active agents -- Detergents -- Determination of anionic-active matter by manual or mechanical direct two-phase titration procedure
(2), Mg
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Solid / Liquid |
|
|
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.
Major Uses
1, Typical applications
Use as emulsifying agent, dispersing agent.
Use as lubricant.
2, Coatings
Drier in paint.
3, Petroleum
Overbased magnesium naphthenate, as high-temperature oil detergent, used in lubricating oil of internal-combustion engine.
4, Lubricating
Lubricant, antirust agent in lubricating oil.
Manufacturers
References
[1]: ChemIDplus. 68424-71-5, Magnesium naphthenates
Update: 20131114(1); 20181023(2);