Description：
DPG(D)
| Accelerator Chemical Name | Diphenyl guanidine |
| Molecular Formula | C13H13N3 |
| Molecular Structure |  |
| Molecular Weight | 211.27 |
| Gravity | 1.13-1.19 |
| CAS NO. | 102-06-7 |
Specification：
Item | Powder | Oil powder | Granular
|
Appearance | Gray-white powder | Gray-white powder | Gray-white granule
|
Initial M.P. (Min) ≥ °C | 145.0 | 145.0 | 145.0
|
Loss on drying (Max) ≤ % | 0.30 | 0.40 | 0.30 |
Ash (Max) ≤ % | 0.30 | 0.40 | 0.30 |
Residues on 150μm sieve, % ≤ | 0.10 | 0.10 | - |
Oil content, % | - | 0.0-2.0 | - |
Granular diameter mm | - | - | 1.5 |
The Origin of DPG
When Oenslager studied the quality of natural rubber, he accidentally discovered that aniline had a vulcanization-promoting effect in 1906. In order to solve the problem of aniline volatility and toxicity, he discovered the condensation product of aniline and carbon disulfide, diphenyl thiourea. (Promoter CA) Substituted aniline. The vulcanization accelerator is rapidly developed from an inorganic vulcanization accelerator to an organic vulcanization accelerator.
In the 1920s, mercaptobenzothiazole (accelerator M) was applied as a vulcanization accelerator in Italy and the United States, and the thiazole vulcanization accelerator was rapidly developed. Promoter M vulcanization operation is safe and vulcanization performance is good, and its discovery is regarded as a milestone in the development of accelerators. In 1922, a promoter D derived from the promoter CA was also developed.
The Performance of DPG
Among most sulfur vulcanized elastomers, DPG is used in combination with a thiazole and a sulfenamide accelerator as a co-promoter. DPG acts as a gel in the NR and SBR latex foaming processes. DPG vulcanization is slow and easy to scorch, generally not only used.