Introduction to ZMBT (MZ) Rubber Accelerator
ZMBT, also known as Zinc 2-mercaptobenzothiazole (MZ), is a widely used secondary rubber accelerator in sulfur-vulcanized rubber systems. It is characterized by excellent scorch safety, moderate curing speed, and enhanced aging resistance, making it an ideal choice for high-performance rubber products requiring stable processing and long service life.
ZMBT is commonly used in NR, SBR, BR, NBR, EPDM, and other general-purpose rubbers, especially in applications where low risk of premature vulcanization is critical.
Key Technical Parameters of ZMBT (MZ)
| Parameter | Typical Value |
|---|---|
| Chemical Name | Zinc 2-mercaptobenzothiazole |
| CAS No. | 155-04-4 |
| Molecular Formula | C14H8N2S4Zn |
| Molecular Weight | 397.8 |
| Appearance | Light yellow to off-white powder |
| Zinc Content | 15.0 – 17.0% |
| Ash Content | ≤ 1.0% |
| Loss on Heating | ≤ 0.5% |
| Solubility | Insoluble in water, soluble in CS₂ |
| Storage Stability | ≥ 24 months (dry & sealed) |
Performance Advantages
1. Excellent Scorch Safety
ZMBT provides longer scorch time compared with MBT (M), reducing the risk of premature vulcanization during mixing and extrusion. This is especially beneficial for complex molds and long processing cycles.
2. Stable and Uniform Vulcanization
As a secondary accelerator, ZMBT works synergistically with MBTS (DM), CBS (CZ), or TBBS (NS), delivering uniform cross-link density and consistent mechanical properties.
3. Improved Aging Resistance
Rubber compounds using ZMBT show lower heat buildup and improved resistance to thermal aging, making it suitable for products exposed to dynamic stress and elevated temperatures.
Typical Applications
- Tires and tire components
- Rubber hoses and belts
- Industrial rubber sheets
- Molded rubber goods
- Rubber footwear and soles
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Recommended Dosage (Reference)
| Rubber Type | ZMBT Dosage (phr) |
|---|---|
| NR | 0.5 – 1.5 |
| SBR | 0.6 – 1.8 |
| NBR | 0.8 – 2.0 |
| EPDM | 0.5 – 1.2 |
Dosage may vary depending on sulfur level, accelerator combination, and processing conditions.
Real Industrial Application Case
Case: Conveyor Belt Manufacturer (SBR/NR Blend)
Background:
A Southeast Asian conveyor belt manufacturer faced uneven curing and scorch issues when using MBT alone in high-temperature extrusion.
Solution:
- MBT replaced partially by ZMBT (MZ)
- Accelerator system optimized: MBTS + ZMBT
- ZMBT dosage: 1.2 phr
Results:
- Scorch time increased by 25%
- Tensile strength improved from 18.5 MPa → 20.1 MPa
- Heat aging retention (100°C × 72h) improved by +12%
- Production scrap rate reduced by ~15%
This demonstrates ZMBT’s ability to balance processing safety and final mechanical performance.
Packaging & Storage
- Packaging: 25 kg kraft paper bags with PE liner
- Storage: Cool, dry, and well-ventilated area
- Shelf life: 24 months under proper storage conditions
Why Choose ZMBT (MZ) from a Professional Supplier?
- Consistent particle size and zinc content
- Stable curing behavior batch-to-batch
- Suitable for export-grade rubber formulations
- Technical support for formulation optimization
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Conclusion
ZMBT (MZ) rubber accelerator is a reliable and cost-effective secondary accelerator that enhances processing safety, improves aging resistance, and ensures stable vulcanization performance. Whether used alone or in combination with sulfenamide accelerators, ZMBT remains a trusted solution for high-quality rubber manufacturing worldwide.