1. Introduction to Polymerization Inhibitor 701
Polymerization Inhibitor 701 (BHT, full name: 2,6-di-tert-butyl-p-cresol, CAS No.: 2226-96-2) is a highly effective phenolic antioxidant and polymerization inhibitor. With excellent free radical scavenging ability and high thermal stability, it effectively prevents spontaneous polymerization of acrylate monomers during storage, transportation, and processing.
2. Why Acrylate Monomers Are Prone to Polymerization
Acrylate monomers (such as methyl acrylate, butyl acrylate, hydroxyethyl acrylate, etc.) contain highly reactive double bonds that can easily undergo free radical polymerization under the following conditions:
Light exposure: Ultraviolet radiation generates free radicals.
High temperature: Elevated temperatures accelerate polymerization.
Presence of metal ions: Certain metal ions can catalyze polymerization.
Peroxide residues: Initiator residues may trigger self-polymerization.
Without inhibitors, monomers may prematurely polymerize during storage or transportation, leading to product failure, pipeline blockages, or even safety incidents.
3. Advantages of Polymerization Inhibitor 701 in Acrylate Monomers
Polymerization Inhibitor 701 provides several significant advantages:
High efficiency: Effectively captures free radicals and blocks chain growth, greatly extending monomer storage life.
Excellent thermal stability: Remains active under elevated temperatures, suitable for summer storage or long-distance shipping.
Low dosage requirement: Effective at concentrations as low as 0.005%–0.05%, reducing overall cost.
Antioxidant protection: Prevents oxidative discoloration, maintaining monomer clarity and purity.
4. Usage Guidelines and Precautions
Timing of addition: It is recommended to add Polymerization Inhibitor 701 during the cooling stage of the monomer to ensure uniform mixing.
Dissolution method: Can be added directly or pre-dissolved in organic solvents such as toluene or acetone.
Dosage reference:
For short-term storage: 0.005%–0.01%
For long-term storage or sea transport: 0.02%–0.05%
Precautions: Avoid contact with metal ions and strong oxidants. Store in a cool, dry place.
5. Typical Application Case
A chemical exporter shipping methyl methacrylate (MMA) faced issues of premature polymerization during sea transport due to long shipping times and large temperature fluctuations. By adding 0.02% Polymerization Inhibitor 701, the monomer remained stable for 45 days of sea transport, with negligible polymerization. This significantly reduced risks of product returns and losses.
Polymerization Inhibitor 701 (BHT, CAS 2226-96-2) plays an irreplaceable role in the safe storage and transportation of acrylate monomers. Proper dosage not only ensures product stability and safety but also minimizes logistics risks and enhances market competitiveness. For acrylate manufacturers and end-users, Polymerization Inhibitor 701 represents a cost-effective and reliable solution.