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Description
Tris(2-n-butoxyethyl) Phosphate (TBEP) is an organophosphate ester widely used as a plasticizer, flame retardant, viscosity modifier, leveling agent, and processing aid in a variety of industrial applications. It combines excellent compatibility with numerous polymer systems and outstanding low-temperature flexibility, making it a valuable additive in coatings, floor finishes, PVC products, synthetic rubber, hydraulic fluids, and textile processing.
TBEP is particularly recognized for its ability to improve flexibility and wear resistance in floor polishes and protective coatings. It also enhances flow characteristics, reduces brittleness, and contributes to improved film formation. In addition to its plasticizing properties, the phosphorus atom within its molecular structure imparts flame-retardant characteristics, making TBEP useful in specialty polymer formulations requiring enhanced fire resistance.
Its balanced combination of low volatility, good hydrolytic stability, excellent solvent compatibility, and multifunctional performance has established TBEP as an important industrial additive in coatings, plastics, and specialty chemical formulations.
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CAS Number
CAS Number: 78-51-3
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Synonyms
• Tris(2-n-butoxyethyl) Phosphate
• TBEP
• Tris(2-butoxyethyl) Phosphate
• Tributoxyethyl Phosphate
• Phosphoric Acid Tris(2-butoxyethyl) Ester
• TBEP Plasticizer
• Organophosphate Plasticizer
• Phosphate Ester Plasticizer
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Physical Properties
TBEP is supplied as a clear, colorless to pale yellow liquid with a mild characteristic odor. It possesses relatively high boiling point, low volatility, and moderate viscosity, making it suitable for demanding industrial applications.
Typical characteristics include:
• Appearance: Clear, colorless to pale yellow liquid
• Physical state: Liquid
• Odor: Mild characteristic odor
• Molecular formula: C₁₈H₃₉O₇P
• Molecular weight: 398.47 g/mol
• Density: Approximately 1.02–1.03 g/cm³
• Boiling point: Approximately 330–340°C
• Flash point: Approximately 190–210°C
• Water solubility: Slightly soluble
• Viscosity: Moderate
Its high boiling point contributes to reduced evaporation during processing and service.
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Chemical Properties
TBEP is a phosphate triester containing three butoxyethyl groups attached to a central phosphorus atom. This structure provides flexibility, plasticizing efficiency, and moderate flame-retardant performance.
Important chemical characteristics include:
• Organophosphate ester
• Good plasticizing efficiency
• Moderate flame-retardant properties
• Low volatility
• Good thermal stability
• Excellent compatibility with PVC
• Good hydrolytic stability
• Excellent film-forming support
TBEP remains chemically stable under normal processing conditions used in plastics and coatings.
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Manufacturing Process
Commercial TBEP is produced through the esterification of phosphorus oxychloride or phosphoric acid derivatives with 2-butoxyethanol under carefully controlled conditions.
Typical manufacturing stages include:
• Preparation of phosphorus intermediate
• Addition of 2-butoxyethanol
• Controlled esterification
• Neutralization
• Removal of by-products
• Vacuum purification
• Filtration
• Quality control testing
• Packaging
Final purification ensures high ester content and low residual acidity.
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Mechanism of Action
TBEP functions primarily by inserting itself between adjacent polymer chains, reducing intermolecular forces and increasing molecular mobility. This produces softer, more flexible materials while maintaining durability.
Its principal functions include:
• Plasticization
• Flexibility enhancement
• Flame-retardant contribution
• Film formation improvement
• Flow enhancement
• Viscosity modification
• Wear resistance improvement
In floor finishes and coatings, TBEP improves leveling, gloss retention, and resistance to abrasion.
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Applications
TBEP is widely used across numerous industries.
Coatings Industry
• Floor finishes
• Protective coatings
• Industrial coatings
• Water-based coatings
• Acrylic emulsions
Plastics Industry
• Flexible PVC
• Vinyl flooring
• Polymer compounds
• Plastic films
Rubber Industry
• Synthetic rubber
• Elastomer formulations
• Flexible seals
Textile Industry
• Textile coatings
• Fabric finishing
• Specialty processing
Industrial Fluids
• Hydraulic fluids
• Lubricants
• Specialty industrial fluids
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Advantages
TBEP provides numerous industrial benefits.
• Excellent plasticizing efficiency
• Good low-temperature flexibility
• Moderate flame-retardant properties
• Excellent wear resistance
• Improved coating flow
• Low volatility
• High boiling point
• Broad polymer compatibility
• Good hydrolytic stability
• Long service life
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Limitations
Certain limitations should be considered.
• Slight water solubility
• Limited flame-retardant performance compared with specialized flame retardants
• May slowly hydrolyze under strongly acidic or alkaline conditions
• Higher viscosity than some conventional plasticizers
• Requires proper handling to avoid prolonged exposure
