In the rubber processing field, sodium dimethyldithiocarbamate (SDD) is a widely used ultra-accelerator with core advantages including fast vulcanization speed, low vulcanization temperature, rubber performance enhancement, good compatibility with other additives, and a wide application range. It can be used as a rubber terminator and a vulcanization accelerator for rubber products.Raw rubber (such as natural rubber and styrene-butadiene rubber) is a linear polymer material by itself, lacking elasticity, strength and wear resistance. It must undergo "vulcanization" to gain practical value.
The key to sodium dimethyldithiocarbamate (SDD) improving the efficiency and performance of rubber vulcanization lies in its ability to rapidly release active sulfur and regulate cross-linking reactions, which well achieves the goal of "cost reduction and efficiency improvement".At vulcanization temperature (usually 80-120℃), SDD can decompose quickly to generate active sulfur atoms, which directly participate in the cross-linking reaction of rubber molecules. Compared with traditional accelerators (such as accelerator M and DM), it can shorten the vulcanization time by 30%-50%. Conventional vulcanization requires a high temperature of 140-160℃, while SDD can reduce the vulcanization temperature to 100-120℃, saving about 15% of energy consumption per ton of rubber products.Meanwhile, low-temperature vulcanization can reduce the aging and degradation of rubber molecules at high temperatures, avoid the "scorching" (local premature vulcanization and hardening) of products, and improve the qualified rate of finished products.
Sodium dimethyldithiocarbamate (SDD) not only optimizes the vulcanization process but also enhances the service performance of rubber products. Its specific effects are as follows:
1.Enhancing mechanical properties: The tensile strength of vulcanized rubber can be increased by 20%-30%, the elongation at break by more than 15%, and the elastic recovery is better, which can maintain the sealing performance of seals after long-term compression.
2.Improving aging resistance and wear resistance: The cross-linking bonds formed with the participation of SDD are more stable, which can reduce the damage of oxygen and ozone to rubber molecules and extend the aging resistance life of products by 2-3 times; at the same time, the uniformity of the cross-linking structure is improved, enhancing the wear resistance of the rubber surface.
3.Optimizing processing adaptability: SDD has good compatibility with rubber, so problems such as agglomeration and sticking to equipment are less likely to occur during processing, reducing waste generation in production.
Nowadays, the concept of environmental protection is deeply rooted in people's minds. With the improvement of the industry's environmental protection requirements, the advantages of sodium dimethyldithiocarbamate (SDD) in the rubber industry have become more prominent, and the industry still has a promising development prospect.In terms of the downstream industry, the downstream automobile industry is developing rapidly at present, which increases the demand for tires and rubber products. This demand is transmitted "from downstream to upstream" to the raw material end, promoting the growth of SDD demand, which in turn boosts the enthusiasm of SDD manufacturers and ultimately achieves the two-way growth of SDD supply and demand.
