Rayway Rubber Accelerator ZMBT (MZ): Properties, Production Process, Applications, and Storage

Rubber accelerator ZMBT


Rubber accelerator ZMBT, also known as MZ, is an important chemical compound in the rubber industry. This article provides a comprehensive overview of the properties, production process, main ingredients, quality standards, applications, and safe storage practices of rubber accelerator ZMBT.

1. Properties of rubber accelerator ZMBT

ZMBT is a pale yellow powder with the following properties:

Rubber Accelerator ZMBT(MZ) 

Chemical Name: Zinc 2-mercaptobenzothiazole



Molecular Formula: C14H8N2S4Zn
Molecular Weight: 397.86
CAS NO: 155-04-4

Item                            ZMBT-2                                   ZMBT-15
  Powder Oiled powder Granule Powder Oiled powder Granule
Appearance Light yellow powder(granule) Light yellow powder(granule)
Loss on drying % ≤ 0.50 0.50 0.50 0.50 0.50 0.50
Zinc content % 16.0-22.0 16.0-22.0 16.0-22.0 15.0-18.0 15.0-18.0 15.0-18.0
Free M % ≤ 5.0 5.0 5.0 15.0 15.0 15.0
Residue on 150μm sieve % ≤ 0.10 0.10   0.10 0.10  
Additive %   1.0-2.0     1.0-2.0  
Granule Diameter mm     2.50     2.50
  • Appearance: Pale yellow powder, odourless with a slightly bitter taste.
  • Melting Point: 300°C (decomposition).
  • Relative Density: 1.70 (25°C).
  • Solubility: Soluble in acetone, slightly soluble in benzene, dichloromethane, carbon tetrachloride, and ethanol, but insoluble in water and gasoline.
  • Chemical Stability: Decomposes when exposed to strong acids or alkalis. It is non-toxic by itself.

These properties make ZMBT widely applicable in the rubber industry.

2. Production Process of rubber accelerator ZMBT

The production process of rubber accelerator ZMBT involves the following key steps:

2.1 Preparation of Accelerator M (2-Mercaptobenzothiazole Accelerator M)

First, accelerator M is prepared by a reaction involving the cyclization and acidification of ortho-nitrochlorobenzene with sodium polysulfide and carbon disulfide under pressurized conditions. This is the primary step in producing ZMBT.

2.2 Production of Accelerator MZ

Subsequently, the sodium salt of accelerator M is obtained by reacting it with sodium hydroxide. Then, the sodium salt of accelerator M is subjected to a double decomposition reaction with zinc sulfate, resulting in the final product, rubber accelerator MZ.

3. Main Ingredients of rubber accelerator ZMBT

The primary ingredients required for the production of rubber accelerator MZ include:

  • Accelerator M (industrial grade)
  • Zinc sulfate (30% concentration)
  • Sodium hydroxide (30% concentration)

These ingredients undergo appropriate reaction steps to form rubber accelerator ZMBT.

4. Quality Standards of rubber accelerator ZMBT

The quality standards for rubber accelerator MZ typically include:

  • Zinc Content: Between 15.7% and 17.5%.
  • Heating Loss: Not exceeding 0.3%.
  • Residue on Sieve (100 mesh): Not exceeding 0.2%.

These standards ensure the production of high-quality accelerator MZ.

5. Applications of rubber accelerator ZMBT

Rubber accelerator ZMBT finds various applications in the rubber industry, including but not limited to:

  • Being a promoter for natural rubber, general-purpose synthetic rubber, and latex, significantly improve the ageing resistance of vulcanized rubber.
  • Enhancing the adhesion strength between rubber and metal, making it useful in applications where rubber bonds with metals.
  • Serving as a rubber latex sensitizer, finding use in the production of latex products, foam rubber, cables, rubber shoes, and medical supplies.
  • Having a higher critical vulcanization temperature (138°C), makes it useful for retarding vulcanization in chloroprene rubber.

6. Safety and Storage

During the production and storage of rubber accelerator MZ, the following safety and storage precautions should be observed:

  • Production equipment should be sealed to prevent leaks.
  • The product itself is non-toxic, but it should be protected from moisture and fire during storage. It should not be stored with strong acids or alkalis.
  • It is recommended to package the product in woven bags with inner plastic film to ensure its quality.
  • The recommended storage period is 2 years, and attention should be given to temperature and humidity control in the storage environment.


Rubber accelerator ZMBT (MZ) plays a significant role in the rubber industry by improving rubber properties and adhesion strength. Understanding its properties, production process, applications, and storage requirements is crucial for the effective utilization and management of this important rubber chemical. For further information or additional questions, please feel free to inquire. Rubber accelerator ZMBT contributes to making rubber products more durable and reliable.