Accelerator TBzTD, chemically known as Tetrabenzylthiuram Disulfide, is a crucial additive in the rubber industry. It plays a significant role in the vulcanization process, which is essential for enhancing the physical properties of rubber products. As a well - established supplier of Accelerator TBzTD, I often receive inquiries about the recommended dosage of this accelerator. In this blog, I will delve into the factors influencing the dosage and provide some general guidelines.
Factors Affecting the Dosage of Accelerator TBzTD
1. Rubber Type
Different types of rubber have varying reactivity and curing characteristics. For example, natural rubber (NR) and synthetic rubbers like styrene - butadiene rubber (SBR) and butadiene rubber (BR) have different molecular structures and chemical compositions. Natural rubber is more reactive compared to some synthetic rubbers. When using Accelerator TBzTD in natural rubber, a relatively lower dosage might be sufficient to achieve the desired curing rate. On the other hand, synthetic rubbers may require a slightly higher dosage to ensure proper vulcanization.
2. Curing System
The choice of the curing system also has a major impact on the dosage of Accelerator TBzTD. There are different curing systems such as sulfur - based curing, peroxide - based curing, etc. In a sulfur - based curing system, Accelerator TBzTD is often used in combination with sulfur and other accelerators. The ratio of these components in the curing system affects the overall performance of the vulcanization process. For instance, if a high - sulfur curing system is used, the dosage of Accelerator TBzTD may need to be adjusted accordingly to balance the curing rate and the properties of the final rubber product.
3. Desired Physical Properties of the Rubber Product
The intended use of the rubber product determines the required physical properties. If a rubber product needs to have high tensile strength, good abrasion resistance, and excellent heat resistance, the dosage of Accelerator TBzTD will be adjusted to optimize these properties. For example, in the production of tires, which require high - performance rubber, the dosage of Accelerator TBzTD is carefully calculated to ensure that the tires can withstand high - speed driving, heavy loads, and various road conditions.
4. Processing Conditions
Processing conditions such as temperature, pressure, and mixing time also influence the dosage of Accelerator TBzTD. Higher processing temperatures generally increase the reactivity of the accelerator, so a lower dosage may be needed. Conversely, at lower temperatures, a higher dosage might be required to achieve the same curing effect. Similarly, longer mixing times can improve the dispersion of the accelerator in the rubber matrix, which may also affect the required dosage.
General Recommended Dosage Ranges
In general, for most rubber applications using a sulfur - based curing system, the recommended dosage of Accelerator TBzTD ranges from 0.5 to 2.0 parts per hundred parts of rubber (phr).
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Low - dosage applications (0.5 - 1.0 phr): This range is typically used when a slower curing rate is desired or when the rubber is highly reactive. For example, in some soft rubber products like rubber gaskets or seals where a more controlled curing process is needed to avoid over - vulcanization and maintain the flexibility of the rubber, a dosage in the lower end of the range can be used.
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Medium - dosage applications (1.0 - 1.5 phr): This is the most common dosage range for a wide variety of rubber products. It provides a good balance between curing rate and the physical properties of the rubber. Many general - purpose rubber products such as rubber hoses, belts, and shoe soles can be produced using a dosage in this range.
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High - dosage applications (1.5 - 2.0 phr): Higher dosages are used when a faster curing rate is required or when the rubber is less reactive. In the production of hard rubber products like rubber rollers or certain industrial rubber parts, a higher dosage of Accelerator TBzTD can be employed to ensure rapid and complete vulcanization.
It is important to note that these are just general guidelines, and the actual dosage should be determined through laboratory testing and optimization for each specific rubber formulation and application.
Comparison with Other Accelerators
When considering the dosage of Accelerator TBzTD, it is also beneficial to compare it with other accelerators. For example, 100KG 95 - 29 - 4 N, N - DIISOPROPYLBENZOTHIAZOLE - 2 - SULFENAMIDE Rubber Accelerator DIBS C13H18N2S2 is another popular accelerator in the rubber industry. DIBS has a different chemical structure and reactivity compared to TBzTD. DIBS is often used in combination with other accelerators to achieve a specific curing profile. The dosage of DIBS also depends on similar factors as TBzTD, but generally, it may have a different optimal dosage range in different rubber formulations.
Another accelerator, CAS:105 - 55 - 5 Accelerator DETU; n,n’ - diethyl - thioure; thiourea accelerator, has its own unique properties. DETU is known for its relatively fast curing action. When comparing with TBzTD, DETU may require a different dosage due to its higher reactivity. In some cases, a combination of TBzTD and DETU can be used to achieve a synergistic effect, where the overall curing performance is enhanced.
3064 - 73 - 1 DiisobutylThiuramDisulfide(Tibtd) C18H36N2S4 is also an accelerator with its own characteristics. It can be used alone or in combination with other accelerators. The dosage of Tibtd needs to be carefully considered in relation to the other components in the rubber formulation and the desired properties of the final product.
Laboratory Testing and Optimization
As mentioned earlier, the recommended dosage of Accelerator TBzTD should be determined through laboratory testing. In a laboratory setting, different dosages of Accelerator TBzTD can be tested in a specific rubber formulation. The curing characteristics such as scorch time, cure time, and cure rate can be measured using instruments like a rheometer. The physical properties of the vulcanized rubber, including tensile strength, elongation at break, hardness, and abrasion resistance, can also be evaluated.
Based on the test results, the optimal dosage of Accelerator TBzTD can be determined. This process may involve several iterations of testing and adjustment to achieve the best balance between curing performance and the physical properties of the rubber product.
Conclusion
Determining the recommended dosage of Accelerator TBzTD is a complex process that involves considering multiple factors such as rubber type, curing system, desired physical properties, and processing conditions. While general dosage ranges can provide a starting point, laboratory testing and optimization are essential for each specific application. As a supplier of Accelerator TBzTD, we are committed to providing our customers with high - quality products and technical support to help them achieve the best results in their rubber production. If you are interested in purchasing Accelerator TBzTD or need more information about its dosage and application, please feel free to contact us for further discussion and procurement negotiation.
References
- "Rubber Technology: Compounding, Processing, and Testing of Rubber" by Maurice Morton.
- "The Vanderbilt Rubber Handbook: 14th Edition" by Robert F. Ohm.