Introduction
Bis(4-tert-butylcyclohexyl) peroxydicarbonate (CAS 15520-11-3), commonly abbreviated as BCHPC or TBCP, is a peroxydicarbonate initiator featuring cyclohexyl substituents with tert-butyl groups. This structural motif imparts distinctive physical and chemical properties that differentiate it from linear alkyl peroxydicarbonates like EHP and IPP.
Key Facts
- CAS Number: 15520-11-3
- Molecular Formula: C22H38O6
- Molecular Weight: 398.54 g/mol
- Appearance: White to off-white crystalline solid
- 10-Hour Half-Life Temperature: ~45-48 deg C
- SADT: ~10-15 deg C
- Storage: Deep refrigerated, typically -15 to -20 deg C
Physical Properties
Unlike many liquid peroxydicarbonates, BCHPC is a crystalline solid at ambient and refrigerated temperatures. This solid form offers certain handling advantages, including reduced risk of spills and simplified dosing in solid form for certain polymerization processes. It is typically supplied as a free-flowing powder or granular material.
Applications
PVC Polymerization
BCHPC is used as a low-temperature initiator for suspension PVC, particularly for specialty resin grades. Its solid form and specific decomposition kinetics make it suitable for processes where liquid initiator handling is less convenient or where the initiator needs to be pre-mixed with other solid additives.
Specialty Polymer Applications
The initiator also finds use in other vinyl and acrylic polymerization processes where its decomposition temperature range aligns with process requirements.
Safety
Like all peroxydicarbonates, BCHPC requires deep refrigerated storage and stringent temperature control. Its solid form requires precautions against dust formation, which could create explosion hazards if peroxidically active dust is suspended in air.
Q: What are the advantages of a solid peroxydicarbonate over liquid alternatives?
A: Solid peroxydicarbonates like BCHPC offer advantages in applications where liquid handling systems are not available or practical. They can be pre-blended with other solid formulation components, simplifying the polymerization feed system. The solid form also eliminates concerns about liquid leakage during storage and transport, though dust management becomes an additional consideration.
Key Takeaways
- BCHPC (CAS 15520-11-3) is a solid peroxydicarbonate initiator for low-temperature polymerization.
- Its crystalline solid form offers handling advantages for specific application scenarios.
- Deep refrigerated storage is mandatory, as for all peroxydicarbonates.
- Shandong Do Sender Chemicals provides specialty peroxydicarbonate initiators with comprehensive technical support.