Rubber Accelerator DOTG (Di-o-tolylguanidine)
Product Name: Di-o-tolylguanidine
Trade Name: Rubber Accelerator DOTG
Chemical Name: 1,3-Di-o-tolylguanidine
Synonyms: N,N'-Di-o-tolylguanidine
CAS No.: 97-39-2
EC No.: 202-577-6
Accelerator DOTG provides strong activation for thiazole (MBTS, MBT, ZMBT) accelerated curing systems in NR, SBR, and NBR. It is also effective in CR with thiuram/sulfur cures. DOTG exhibits better processing safety than DPG (diphenyl guanidine). DOTG requires the use of zinc oxide to develop a good cure. Fatty acids are not required; in fact, excess fatty acids (>1phr) may cause a reduction in physical properties. Vulcanizates cured with DOTG result in high states of cure. Compounds using DOTG as a secondary accelerator can be vulcanized by all methods (press, steam, hot air). Antioxidants are always recommended for maximum aging protection. Although DOTG is acceptable under CFR 21, section 177.2600 "Rubber Articles Intended for Repeated Food Contact," its pronounced odor and bitter taste imparted to a rubber article may preclude its use in food-handling applications. DOTG will also cause white compounds to discolor when they are exposed to light.
Specification
| Item | Powder | Oiled powder | Granule |
| Appearance (visual inspection) | Gray-white powder(granule) | ||
| Initial M.P. ℃≥ | 168 | 167 | 167 |
| heating loss %≤ | 0.4 | 0.4 | 0.4 |
| Ash%≤ | 0.4 | 0.4 | 0.4 |
| Residues on sieve(150μm), % ≤ | 0.1 | 0.1 | \ |
| Residues on sieve(63μm), % ≤ | 0.5 | 0.5 | \ |
| Oil content, % | \ | 1.0-2.0 | \ |
| Granule diameter, mm | \ | \ | 1.5-2.5 |
Product Characteristics
Gray-white powder or granule with a slightly bitter taste and no obvious odor. The density is 1.01–1.02 g/cm³. It is soluble in chloroform, acetone, and alcohol, slightly soluble in benzene, and insoluble in water and gasoline.
Application
- Suitable for natural rubber (NR) and diene synthetic rubber compounds.
- Applicable to various rubber types, including NR, SNR, IIR, IR, SBR, NBR, and CR.
- Usually used in combination with thiazoles, thiurams, dithiocarbamates, and sulfenamides to improve vulcanization activity.
- Rarely used as a single accelerator; commonly used as an auxiliary accelerator in rubber formulations.
- Can be used as a peptizer (plastic decomposer) for chloroprene rubber (CR).
- Not recommended for food-contact applications or medical products.
Packaging
20/25kg plastic woven bag, paper with plastic film bag, kraft paper bag.
Storage
The product should be stored in the dry and cooling place with good ventilation, avoiding exposure of the packaged product to direct sunlight. The validity is 1 year.
useage
- Used as a medium-speed accelerator for natural rubber (NR) and synthetic rubber compounds.
- Widely applied in the production of tires, rubber sheets, rubber shoes, and other rubber industrial products.
- Used as an auxiliary accelerator with thiazole and sulfenamide accelerators in NR and SBR formulations.
- Provides better storage stability compared with thiuram and dithiocarbamate accelerators, although with lower activity.
- Can be used as an auxiliary gelling agent (foam stabilizer) in fluorinated silicone foam processing for latex applications.
FAQ
- What types of rubber can DOTG be used for?
- DOTG is suitable for natural rubber (NR), synthetic rubber such as SBR, NBR, and other rubber compounds.
- What is the appearance of DOTG?
- DOTG is usually a gray-white powder or granule with good dispersion in rubber formulations.
- What are the main applications of DOTG?
- DOTG is widely used in tires, rubber belts, hoses, rubber shoes, and other rubber products.
- How should DOTG be stored?
- DOTG should be stored in a cool, dry, and well-ventilated place, protected from moisture and direct sunlight.
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