Phosphoric Acid Octadecyl Ester—also known as Octadecyl Phosphate—is a high-purity long-chain phosphate ester widely used as a surfactant, dispersant, surface conditioner, lubricant, and anti-caking additive. Its unique molecular architecture makes it a powerful multifunctional ingredient across coatings, plastics, metalworking fluids, oilfield chemicals, leather processing, and especially in fertilizer surface treatment where caking must be prevented.

As global industries shift toward more stable, efficient, and high-performance additives, this long-chain phosphate ester has become a preferred material for manufacturers seeking better moisture resistance, improved flowability, enhanced stability, and stronger environmental compliance.

BLi-T (Hefei) Chemical Co., Ltd. is a professional supplier of Phosphoric Acid Octadecyl Ester (CAS 39471-52-8), offering stable quality, technical support, and global delivery to over 60 countries. For specifications, samples, or quotations, contact info@blitchem.com.

Là gì Phosphoric Acid Octadecyl Ester (CAS 39471-52-8)

Phosphoric Acid Octadecyl Ester is a long-chain alkyl phosphate ester formed by reacting octadecyl alcohol (C18) with phosphoric acid. The resulting structure features:

• A highly hydrophobic C18 chain
• A reactive, polar phosphate head group
• Excellent surface-activity and stability

This combination allows the molecule to interact with both hydrophobic and hydrophilic surfaces, providing exceptional wetting, dispersing, and surface-conditioning capabilities.

Common Synonyms in Industry:Octadecyl Phosphate、C18 Phosphate Ester、Phosphoric Acid Octodecyl Ester、Long-Chain Organic Phosphate

Its strong hydrophobicity and balanced polarity make it one of the most versatile specialty phosphate esters used across modern industrial formulations.

Phosphoric Acid Octadecyl Ester Chemical Properties and Performance Characteristics

High Hydrophobicity from C18 Long Chain

The octadecyl chain provides:

• Strong water repellency
• Durable hydrophobic film formation
• Reduced moisture absorption
• Enhanced anti-caking performance in fertilizers

Active Polar Phosphate Group

The phosphate head group offers:

• Improved wetting
• Strong surface adsorption
• Enhanced dispersibility
• High affinity for mineral surfaces
• Anti-corrosion properties

This dual-functionality enables the product to perform across organic, inorganic, and polymer systems.

Thermal and Chemical Stability

Phosphoric Acid Octadecyl Ester maintains stability in:

• High-temperature plastic processing
• Fertilizer granule coating processes
• Metalworking lubricants under shear
• Oilfield chemical environments

This makes it suitable for demanding industrial conditions.

Biodegradability & Low Toxicity

Compared with older-generation surfactants, phosphate esters are:

• More environmentally friendly
• Lower in toxicity
• Easily biodegradable

This aligns with global sustainability requirements.

How Phosphoric Acid Octadecyl Ester Works (Mechanisms Explained)？

Interfacial Modification

The phosphate head strongly binds to surfaces, helping:

• Wetting of pigments
• Wetting of mineral fillers
• Dispersing solid particles
• Stabilizing suspensions

This effect is crucial in the coatings and plastics industries.

Hydrophobic Film Formation

The C18 chain forms:

• A flexible monomolecular film
• A water-repellent surface
• A moisture barrier
• Long-lasting protection

This mechanism is essential in fertilizer anti-caking applications.

Electrostatic Regulation

The phosphate ester reduces static charges on:

• Plastic surfaces
• Fertilizer particles
• Mineral powders

This improves flowability and reduces dust.

Lubrication & Anti-Wear Effects

The phosphate head group forms a boundary lubrication layer, providing:

• Lower friction
• Reduced wear
• Improved metalworking performance

Industrial Applications

Coatings and Paints

In coatings, the product helps:

• Improve pigment wetting
• Stabilize dispersion
• Reduce flooding and floating
• Enhance anti-settling properties
• Increase hydrophobicity of the finished film

It is especially useful in:

• Industrial coatings
• Powder coatings
• UV-cured coatings
• Corrosion-resistant paints

Plastics and Polymer Additives

Common functions include:

• Enhancing filler dispersion
• Reducing static charge
• Acting as a surface modifier
• Improving moisture resistance
• Providing slip and anti-block properties

Suitable for:

• PP / PE
• PVC
• Engineering plastics
• Rubber compounds

Metalworking Fluids

As a lubricant additive, it provides:

• Excellent boundary lubrication
• Improved extreme-pressure performance (EP)
• Low foaming behavior
• Better wear protection

Used in:

• Cutting fluids
• Rolling oils
• Stamping fluids
• Drawing lubricants

Leather & Textile Chemicals

The product improves:

• Softness
• Smoothness
• Hydrophobicity
• Processing uniformity

Oilfield Chemicals

Applications include:

• Emulsifiers
• Demulsifiers
• Scale-control agents
• Surfactant boosters

Fertilizer Anti-Caking Agent

Caking in fertilizers is a serious global issue that significantly affects product quality, storage stability, and market value. Fertilizers that commonly experience caking include:

• Urea
• NPK compounds
• MAP / DAP
• Ammonium-based fertilizers
• Potassium chloride (MOP)
• Potassium sulfate (SOP)

How Phosphoric Acid Octadecyl Ester Prevents Caking

Hydrophobic Coating Layer

The C18 chain creates a uniform moisture-repellent film on fertilizer granules, preventing:

• Water absorption
• Liquid bridge formation
• Moisture-induced recrystallization

Reduction of Static Charges

Improved electrostatic stability significantly enhances:

• Flowability
• Handling efficiency
• Packaging quality

Application Methods in Fertilizer Plants

• Spray Coating Method

Typical level: 0.1–0.8%

• Dry Mixing

Typical level: 0.2–1.0%

• Compatibility

Can be used with:

• Waxes
• Amines
• Light oils
• Surfactant blends

Benefits for Fertilizer Manufacturers

• 30–70% reduction in caking strength
• Improved storage stability
• Better flow properties
• Reduced product loss
• Higher market acceptance
• Easier distribution & handling

Benefits in Formulation Systems

Phosphoric Acid Octadecyl Ester offers:

• High thermal stability
• Strong hydrophobicity
• Rapid wetting action
• Excellent surface compatibility
• Improved processing performance
• Effective anti-caking functionality
• Reduced dusting in powders
• Enhanced surface lubrication

Recommended Usage & Dosage

BLi-T Chemical provides formulation support based on specific production conditions.

Safety, Handling & Storage

To maintain product quality:

• Store in sealed containers
• Keep in cool, dry environments
• Avoid excessive heat or sunlight
• Handle with standard chemical PPE

Comparison With Other Phosphate Esters

The C18 long chain provides superior water-repellent performance compared with shorter-chain esters.

Why Choose BLi-T (Hefei) Chemical Co., Ltd.?

BLi-T Chemical offers:

• High-purity CAS 39471-52-8
• Factory-direct price
• Stable production capacity
• Technical support for fertilizer coating
• Consistent quality
• Worldwide shipping

info@blitchem.com

Câu hỏi thường gặp

Q1: Is Phosphoric Acid Octadecyl Ester effective for urea and NPK fertilizer anti-caking?

Yes. It is one of the most efficient long-chain anti-caking agents for granular fertilizers, reducing moisture absorption and improving flowability.

Q2: Does BLi-T offer multiple grades?

Yes. BLi-T (Hefei) Chemical Co., Ltd. supplies both industrial-grade and fertilizer-grade versions, tailored for coatings, plastics, metal fluids, and anti-caking applications.

Q3: What is the recommended dosage for fertilizer coating systems?

Typical levels are 0.1–0.8%, depending on fertilizer type, moisture level, and coating equipment.

Phosphoric Acid Octadecyl Ester (CAS 39471-52-8) is a highly versatile and valuable long-chain phosphate ester with applications across multiple industries. Its performance in fertilizer anti-caking is especially noteworthy, offering manufacturers a reliable and high-efficiency way to enhance product stability and market value.

BLi-T (Hefei) Chemical Co., Ltd. is committed to supplying high-purity materials, consistent quality, and dependable global delivery. For technical data, samples, or pricing, contact: info@blitchem.com