Dipropylene Glycol n-Propyl Ether (DPnP), identified by CAS number 29911-27-1, is a high-performance, slow-evaporating P-series glycol ether. Chemically, it consists of a mixture of isomers, primarily 1-(2-propoxy-1-methylethoxy)propan-2-ol. This colorless liquid is characterized by its dual functionality—containing both ether and hydroxyl groups—which provides a unique balance of hydrophilic and lipophilic properties.
DPnP is highly regarded in the chemical industry as a versatile “bridge” solvent, capable of coupling organic resins with aqueous phases. Its slow evaporation rate makes it an exceptional coalescent for water-borne coatings, ensuring proper film formation and structural integrity. Unlike E-series glycol ethers, DPnP offers a more favorable toxicological profile and lower volatility, aligning with modern environmental and safety regulations. It possesses a mild, non-intrusive odor and a high flash point, making it a preferred choice for heavy-duty cleaners and industrial coatings where safety and performance are paramount.
**Superior Coalescing Efficiency:** Effectively lowers the Minimum Film Forming Temperature (MFFT) in latex systems, ensuring smooth, durable finishes.
**Excellent Solvency:** Acts as a powerful solvent for a wide range of resins, including acrylic, epoxy, alkyd, and nitrocellulose.
**Low Volatility:** Its slow evaporation rate prevents premature drying, improving “open time” and leveling in architectural coatings.
**Surface Tension Reduction:** Significantly reduces the surface tension of water-based formulations, enhancing wetting and penetration on various substrates.
**Enhanced Safety Profile:** Features low acute toxicity and a high flash point ($94^circtext{C}$), reducing fire hazards during storage and handling compared to faster-evaporating solvents.
**High Chemical Stability:** Remains stable under a wide range of pH conditions, making it suitable for both acidic and alkaline cleaning formulations.
**Molecular Formula:** $text{C}_9text{H}_{20}text{O}_3$
**Molecular Weight:** $176.25text{ g/mol}$
**Boiling Point:** $212^circtext{C}$ ($414^circtext{F}$) at $760text{ mmHg}$.
**Evaporation Rate:** $0.02$ (n-Butyl Acetate = 1), classifying it as a very slow-evaporating solvent.
**Vapor Pressure:** $0.08text{ mmHg}$ at $20^circtext{C}$, contributing to low VOC emissions in specific regulatory contexts.
**Solubility:** Partially soluble in water ($15text{ g/100g}$ at $25^circtext{C}$); however, it exhibits complete miscibility with most organic solvents.
**Specific Gravity:** $0.916$ at $20^circtext{C}$.
**Viscosity:** $4.9text{ cP}$ at $25^circtext{C}$, providing low-viscosity thinning capabilities for resin concentrates.
• Electrical and electronics
• Connectors, switches, PCB housings, terminal blocks
• Automotive
• Under-hood components, interior assemblies, cable conduits
• Wire and cable
• Insulation layers, sheathing, jacketing materials
• Construction
• Plastic fittings, conduits, insulation panels
• Consumer appliances
• Enclosures, adapters, plugs, casings
• Industrial components
• Fiber-reinforced composites, flame-retardant masterbatches
• Compatible polymers
• PA6, PA66
• PBT, PET
• PE, PP
• Blends and copolymers requiring halogen-free flame retardancy
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