Rubber Accelerators: Yellow Granules for Efficient Vulcanization & Performance

Rubber accelerators are indispensable core additives in the rubber industry. They are typically yellow solid granules with a uniform color, free from obvious discoloration, lumps, or impurities, and have a reasonable particle size distribution, facilitating uniform dispersion in rubber raw materials.

Core Function: Accelerating vulcanization and improving performance

Rubber accelerators are a key component of the rubber vulcanization system. Their core mission is to lower the activation energy of the vulcanization reaction, thereby significantly shortening vulcanization time, lowering vulcanization temperature, and reducing the amount of vulcanizing agent used.

Simply put, they act like a highly efficient "catalyst," making the process of transforming raw rubber into a high-strength, highly elastic finished product faster, more energy-efficient, and more stable.

More importantly, the color uniformity of the accelerator directly reflects the purity of the product and the stability of the production process. High-quality yellow granular accelerators ensure uniform dispersion in the rubber compound, avoiding performance deviations caused by uneven local vulcanization, thus guaranteeing the quality stability of the final product.

Common Types and Application Scenarios

Common yellow solid granular rubber accelerators mostly belong to the sulfenamide, thiazole, or thiuram categories. Among them, sulfenamides (such as TBBS) are the most widely used. They appear as pale yellow to yellow granules, possess delayed vulcanization properties, offer high processing safety, and significantly improve the tensile strength, elasticity, and fatigue resistance of rubber products after vulcanization.

These properties also meet the technical requirements for granular accelerators in the GB/T 21840-2025 national standard, which came into effect on February 1, 2026.

In terms of application scenarios, these accelerators cover almost all rubber product fields:

Tire industry: Accounting for over 72%, this is the core application scenario. Used in tire treads, sidewalls, and cord layers, they significantly improve wear resistance, aging resistance, and service life, especially meeting the stringent requirements of new energy vehicle tires for low rolling resistance and high wear resistance.

Non-tire rubber products: Widely used in rubber shoes, hoses, belts, cable insulation, medical gloves, seals, etc. They improve the processing performance of rubber compounds, giving products better elasticity, toughness, and durability.

Green Transformation: Environmental Friendliness and Efficiency Become New Trends

With the continued tightening of environmental policies and the advancement of "dual-carbon" targets by 2026, the rubber accelerator industry is undergoing a green transformation. Traditional high-polluting products are being phased out, and the industry is shifting its focus to environmentally friendly products that are free of nitrosamines and low in VOCs (volatile organic compounds).

These new accelerators not only maintain the excellent appearance and performance of yellow solid particles but also achieve compliant emissions of waste gas and wastewater, meeting industry environmental requirements.

Simultaneously, the application of continuous microchannel reaction technology further improves the purity and particle uniformity of the product, making the yellow particles more stable in color and more dispersible, providing a strong guarantee for the high-quality production of downstream products.

Usage and Storage Tips

During use, rubber accelerators need to be used in conjunction with activators such as zinc oxide and stearic acid to fully exert their promoting effect. The specific dosage needs to be adjusted reasonably according to the type of rubber product, performance requirements, and production process to avoid affecting product quality due to excessive or insufficient dosage.

When storing, it should be placed in a dry, ventilated, and cool environment to prevent moisture absorption and clumping, which would affect the dispersion effect and performance.

From tires to rubber shoes, from cables to seals, these small, yellow solid granular rubber accelerators play an indispensable role in the rubber industry. With the increasing concentration of production capacity in the domestic rubber accelerator industry and the continuous growth in the output and export volume of environmentally friendly products, these yellow granules are becoming an important support for promoting the high-quality development of the rubber industry.

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