3-Methyl-3-buten-1-ol Polyoxyethylene Ether (TPEG 2400): Essential Monomer for Polycarboxylate Superplasticizers

Technical Introduction

3-Methyl-3-buten-1-ol Polyoxyethylene Ether (TPEG 2400) is a high-purity macromonomer with the general formula:

CH₂=C(CH₃)–CH₂–CH₂–O–(CH₂CH₂O)ₙ–H,

where n corresponds to a molecular weight of approximately 2400. The molecule contains a reactive terminal double bond and a long polyoxyethylene chain, making it ideal for free-radical copolymerization with acrylic acid, maleic anhydride, or other unsaturated monomers.

TPEG 2400 is widely recognized as a key raw material for the synthesis of polycarboxylate ether (PCE) superplasticizers used in high-performance concrete. The long side chains provide strong steric hindrance, dispersing cement particles effectively, while the vinyl functionality ensures high polymer incorporation efficiency.

Applications

1. Polycarboxylate Superplasticizer Manufacturing

   • Improves water reduction rates and workability.

   • Produces high-strength concrete with reduced cement content.

2. Slump Retention Additives

   • Helps maintain fluidity for extended durations, especially in hot climates.

3. High-Flow Mortars & Grouts

   • Enhances spreadability without increasing water-to-cement ratio.

4. Specialty Water-Soluble Polymers

   • Used in coatings, dispersants, and polymeric surfactants requiring strong steric effects.

Advantages

• High Incorporation Rate – Vinyl group ensures efficient copolymerization.

• Excellent Dispersion – Long polyoxyethylene chain prevents particle agglomeration.

• Superior Water Reduction – Achieves significant slump improvement at low dosage.

• Versatile Compatibility – Works with OPC, blended cements, and SCM-rich formulations.

• Stable Quality – Narrow molecular weight distribution for consistent performance.

Typical Parameters

FAQs

Q1: How does TPEG differ from EPEG in PCE synthesis?
A1: TPEG’s branched structure (due to the methyl group) enhances steric hindrance, leading to better slump retention, while EPEG offers slightly better water reduction in some systems.

Q2: What molecular weight is best for slump retention?
A2: Around 2400–3000 is generally optimal for balancing water reduction and slump retention in most cement systems.

Q3: How should TPEG 2400 be stored?
A3: Store in airtight containers, away from heat and direct sunlight. Inhibitors such as MEHQ are typically added to prevent premature polymerization.

Q4: Can TPEG be used in polymer applications outside construction?
A4: Yes, TPEG’s reactivity and hydrophilic chain make it useful in specialty coatings, adhesives, and dispersants.

Q5: What is the typical dosage in PCE synthesis?
A5: Generally 20–60% by weight of total monomers, depending on the desired side-chain length in the polymer.