Description
NP 6 is a nonionic surfactant, similar to NP 9, but with an average of 6 moles of ethylene oxide (EO) attached to the nonylphenol molecule. The lower number of EO units makes it more lipophilic (oil-loving) and less hydrophilic (water-loving) compared to NP 9. This gives NP 6 distinct technical properties and applications.
Key Properties
| Parameter | Specification |
| EO Moles | 6 (average) |
| HLB Value | ~10.9–11.0 |
| Density @ 20–25 °C | 1.02 – 1.06 g/cm³ |
| Viscosity @ 25 °C | ~150–300 cP |
| pH (1% solution, 25 °C) | ~5.5 – 8.0 |
| Hydroxyl Value | 110 – 121 mg KOH/g |
| Moisture Content | ≤ 0.2–0.5 wt% |
| Color (APHA) | ≤ 100 |
| Cloud Point (~1%) | ~50 °C |
| Flash Point | 100–200 °C (closed cup typical) |
| Active Content | ≥ 99 % |
| Shelf Life (Unopened) | ≥ 24 months |
Uses
The lower HLB value of NP 6 makes it particularly effective in applications where oil solubility and emulsifying properties are more important than water solubility.
Emulsifier: It’s an excellent emulsifier for mineral oils, petroleum, and other aliphatic hydrocarbons. This makes it a crucial component in the formation of oil-in-water emulsions, as well as an aid for coupling water-based detergents into hydrocarbon systems.
Industrial Cleaners and Degreasers: NP 6 is used in formulations for heavy-duty industrial cleaners and degreasers, where its ability to emulsify and lift stubborn oils and greases is highly valued.
Agrochemicals: It functions as an emulsifier in pesticide and herbicide formulations to ensure the active ingredients are properly dispersed and can effectively penetrate the target.
Metalworking Fluids: Used as a component in cutting fluids and lubricants to stabilize emulsions and provide cleaning and anti-corrosive properties.
Textile Processing: Employed as a wetting agent, emulsifier, and dispersant in textile auxiliaries.
Paints and Coatings: Helps in dispersing pigments and stabilizing water-based paint systems.
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