Ethyl 3-[[bis(1-methylethoxy)phosphinothioyl]thio]propionate cas no 71735-74-5

Lubricant Additives

Ethyl 3-[[bis(1-methylethoxy)phosphinothioyl]thio]propionate

CAS No.: 71735-74-5

Who is are Supplier and Manufacturer for CAS No.: 71735-74-5

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1. Physical Properties

- Appearance: Colorless to pale yellow transparent liquid

- Molecular formula: C₁₁H₂₃O₄PS₂

- Molecular weight: 314.4 g/mol

- Density (25°C): approx. 1.08–1.10 g/cm³

- Refractive index (25°C): n_D²⁵ ≈ 1.480

- Boiling point: 359.8°C at 760 mmHg

- Flash point: 171.4°C (closed cup)

- Solubility: Insoluble in water; soluble in mineral oils, synthetic oils, esters and other non-polar/weakly polar organic solvents

- Volatility: Low volatility under normal temperature and pressure

2. Chemical Properties & Specifications

- Active elements: Typical P content 9.0–11.0%, S content 20.0–22.0%

- Industrial purity: ≥96%

- Acid value: ≤0.5 mgKOH/g

- Moisture content: ≤0.1%

- Structural type: Ashless organothiophosphate compound containing P=S, P–O–isopropyl and S–C linkages

- Thermal stability: Good high-temperature stability; tends to decompose under strong acid

- Corrosiveness: Low corrosivity to copper and steel; mild reactivity with certain heavy metals

- Reactivity: Forms protective phosphorus-sulfur films on metal surfaces under boundary lubrication conditions

3. Application Markets

- Lubricant additives: Mainly used as an extreme pressure (EP) and antiwear (AW) additive in industrial lubricants

- Metalworking fluids: Applied in cutting fluids, drawing fluids, rolling fluids and forming oils

- Industrial lubrication systems: Gear oils, hydraulic oils, way lubricants, bearing oils and greases

- Environmentally friendly formulations: Suitable for low-ash, ashless and low-emission lubricant packages

4. Analysis as a Lubricant Additive

- Functional mechanism: Releases active sulfur and phosphorus under frictional heat and pressure to form a durable protective film on metal surfaces, preventing wear and seizure

- Performance advantages:

- Excellent extreme pressure and antiwear performance for heavy-duty conditions

Product features:

Ultra low ash, low phosphorus, low sulfur, and post-treatment protection

Low conductivity, insulation, copper aluminum corrosion resistance, low friction, high speed stability

Sulfur free, ash free, hydrogen embrittlement resistant, high temperature resistant.

The Origin and Major Production Regions for product CAS No.: 71735-74-5

- China: Major producers in Hunan SLQ Materials Technology co.,ltd

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