Methyl Allyl Alcohol Polyoxyethylene Ether (HPEG 2400): High-Performance Monomer for Polycarboxylate Superplasticizers
Technical Introduction
Methyl Allyl Alcohol Polyoxyethylene Ether (HPEG 2400) is a macromonomer with the general structural formula:
CH₂=CH–CH₂–O–(CH₂CH₂O)ₙ–H,
where n corresponds to an average molecular weight of approximately 2400. This compound features a reactive allyl group at one end and a polyoxyethylene (PEO) chain of controlled length at the other, enabling strong hydrophilicity and excellent reactivity during polymer synthesis.
HPEG 2400 is widely used in the production of polycarboxylate ether (PCE) superplasticizers for high-performance concrete. The allyl group participates in free-radical polymerization with acrylic acid, maleic anhydride, or similar monomers, while the long PEO chain provides steric hindrance that disperses cement particles efficiently and maintains fluidity over time.
Applications
Polycarboxylate Superplasticizer Production
Delivers high water reduction rates and extended slump retention.
Suitable for both ready-mix and precast concrete.
Slump Retention Additives
Effective in hot climates and long-distance concrete transportation.
High-Flow Cementitious Materials
Improves workability of self-compacting concrete (SCC) and grouts.
Functional Water-Soluble Polymers
Used in dispersants, detergents, and coating additives for improved stability and flow properties.
Advantages
High Reactivity – Allyl group ensures efficient polymer incorporation.
Excellent Cement Dispersion – Long polyoxyethylene chain prevents particle flocculation.
Optimized Slump Retention – Molecular weight (~2400) offers a balance of water reduction and workability retention.
Broad Compatibility – Works with ordinary Portland cement, blended cements, and SCM-rich formulations.
Stable and Consistent Quality – Narrow molecular weight distribution guarantees predictable performance.
Typical Parameters
| Property | Value |
|---|---|
| Appearance | Colorless to light yellow viscous liquid |
| Average Molecular Weight | ~2400 |
| Purity | ≥99% |
| Hydroxyl Value (mgKOH/g) | 23–26 |
| Allyl Content | ≥98% |
| Moisture Content | ≤0.5% |
| pH (1% aqueous solution) | 5–7 |
| Solubility | Completely soluble in water |
FAQs
Q1: How does HPEG 2400 compare with TPEG 2400 in PCE synthesis?
A1: HPEG has a straight-chain allyl group, providing slightly better water reduction in some systems, while TPEG’s branched structure often yields better slump retention.
Q2: Can HPEG 2400 be used together with TPEG or EPEG?
A2: Yes, combining different macromonomers can fine-tune PCE properties for specific cement types and climatic conditions.
Q3: How should HPEG 2400 be stored?
A3: Keep in sealed containers, away from heat and direct sunlight. Store with a small amount of polymerization inhibitor (e.g., MEHQ) to maintain stability.
Q4: Is HPEG suitable for non-construction polymers?
A4: Yes, it can be used in surfactants, coatings, and dispersants that require high water solubility and reactivity.
Q5: What is the recommended dosage in PCE synthesis?
A5: Typically 20–50% by weight of the total monomers, depending on desired side-chain density and polymer structure.
Free Consultation
Name*
E-Mail*
TEL
Message*