Ethylene Glycol Monovinyl Polyoxyethylene Ether (EPEG 3000): A Key Monomer for High-Performance Polycarboxylate Superplasticizers

Technical Introduction

Ethylene Glycol Monovinyl Polyoxyethylene Ether (EPEG 3000) is a macromonomer with the general structure CH₂=CH–O–(CH₂CH₂O)ₙ–CH₂CH₂OH, where n corresponds to an average molecular weight of around 3000. EPEG 3000 contains a vinyl group at one end and a long polyoxyethylene chain, giving it both high reactivity and excellent water solubility.

EPEG 3000 is primarily used in the synthesis of polycarboxylate ether (PCE) superplasticizers for concrete and mortar. The vinyl group participates in free-radical polymerization with carboxylic acid monomers, while the polyoxyethylene chain imparts steric hindrance and dispersing properties to the final polymer. This combination results in superior water reduction, slump retention, and compatibility with various cement types.

Applications

1. Polycarboxylate Superplasticizer Production

   • Improves concrete workability and reduces water demand.

   • Enables high-strength concrete production with lower cement consumption.

2. Slump Retention Agents

   • EPEG-based PCE maintains workability for extended periods, ideal for ready-mix applications.

3. High-Performance Mortars and Grouts

   • Enhances flowability without sacrificing strength or durability.

4. Other Functional Polymers

   • Used in coatings, dispersants, and specialty water-soluble polymers.

Advantages

• High Reactivity – Vinyl group ensures efficient copolymerization with acrylic acid, maleic anhydride, and other monomers.

• Excellent Dispersibility – Long polyoxyethylene chain provides strong steric hindrance, reducing flocculation.

• Stable Performance – EPEG-based PCE shows consistent water reduction and slump retention across different cement types.

• Low Dosage, High Effect – Achieves significant performance improvement with minimal addition.

• Customizable – Molecular weight can be tailored to specific performance requirements.

Typical Parameters

FAQs

Q1: Why choose EPEG 3000 over other EPEG grades?
A1: The molecular weight of 3000 offers an optimal balance between water reduction and slump retention in PCE formulations.

Q2: Is EPEG 3000 compatible with all cement types?
A2: Yes, EPEG-based superplasticizers work well with OPC, blended cement, and supplementary cementitious materials.

Q3: How should EPEG 3000 be stored?
A3: Store in sealed containers in a cool, dry place away from heat and direct sunlight. Avoid prolonged exposure to air to prevent vinyl group degradation.

Q4: Does EPEG 3000 require inhibitors?
A4: Yes, small amounts of polymerization inhibitors (e.g., MEHQ) are typically added during storage to maintain stability.

Q5: Can EPEG 3000 be used in non-construction applications?
A5: Yes, it can be used in water-soluble polymers for coatings, textile finishing agents, and dispersants.