 |
Item | Specification |
Appearance | Brown liquid |
Purity(by weight) | 99.0 min |
Sulphur Content(%) | 54.0 min |
sDensity(20/4℃)(kg/m3) | / |
Water(%) | 0.08 max |
Flash point(℃) | 70 min |
Viscosity at 40℃(mm2/s) | / |
Solubility | Slightly soluble in water: 1500mg/L, miscible with alcohols, ethers, etc |
Thermal decomposition Temperature(℃) | 140 ~ 160 |
Comparison of vulcanization physicochemical properties between Di pert Butyl Polylfide and DMDS
Item | Di-tert-Butyl Polysulfide | DMDS |
Appearance | Brown liquid | Pale yellow liquid |
Sulphur Content(%) | 54.0 min | 67.9 ~ 68.3 |
Thermal decomposition Temperature(℃) | 140 ~ 160 | 200 |
Flash point(℃) | 85 | 16 |
Odor | Lower odor (hydrocarbon oil odor) | The smell of rotten cabbage |
GHS | NON-DG | DG |
From Table, it can be seen that:
(1) Di-tert-Butyl Polysulfide has a higher flash point than DMDS, therefore, it has safer use, storage, and transportation performance than DMDS;
(2) Di-tert-Butyl Polysulfide has a low odor, only a faint gasoline like hydrocarbon odor, and does not pollute the environment;
(3) The decomposition temperature of Di-tert-Butyl Polysulfide is lower than that of DMDS, and the decomposition temperature range is wide. It decomposes at lower temperatures and is easily adsorbed by the catalyst, with better adsorption effect than DMDS. Due to the lower decomposition temperature compared to DMDS, vulcanization reaction can be carried out at low temperatures, shortening the vulcanization time. Additionally, due to the certain molecular weight distribution of Di-tert-Butyl Polysulfide, the vulcanizing agent continuously decomposes during the vulcanization heating process, causing the hydrogenation catalyst to vulcanize slowly, Avoiding the concentrated heat release of the catalyst and the occurrence of hot spots in the bed temperature effectively protects the hydrogenation catalyst from thermal deactivation.
(4) The appearance of Di-tert-Butyl Polysulfide is a brown black liquid, which is easy to determine and verify the injection amount through a liquid level gauge during the vulcanization process.
Item | Specification |
Appearance | Brown liquid |
Purity(by weight) | 99.0 min |
Sulphur Content(%) | 54.0 min |
sDensity(20/4℃)(kg/m3) | / |
Water(%) | 0.08 max |
Flash point(℃) | 70 min |
Viscosity at 40℃(mm2/s) | / |
Solubility | Slightly soluble in water: 1500mg/L, miscible with alcohols, ethers, etc |
Thermal decomposition Temperature(℃) | 140 ~ 160 |
Comparison of vulcanization physicochemical properties between Di pert Butyl Polylfide and DMDS
Item | Di-tert-Butyl Polysulfide | DMDS |
Appearance | Brown liquid | Pale yellow liquid |
Sulphur Content(%) | 54.0 min | 67.9 ~ 68.3 |
Thermal decomposition Temperature(℃) | 140 ~ 160 | 200 |
Flash point(℃) | 85 | 16 |
Odor | Lower odor (hydrocarbon oil odor) | The smell of rotten cabbage |
GHS | NON-DG | DG |
From Table, it can be seen that:
(1) Di-tert-Butyl Polysulfide has a higher flash point than DMDS, therefore, it has safer use, storage, and transportation performance than DMDS;
(2) Di-tert-Butyl Polysulfide has a low odor, only a faint gasoline like hydrocarbon odor, and does not pollute the environment;
(3) The decomposition temperature of Di-tert-Butyl Polysulfide is lower than that of DMDS, and the decomposition temperature range is wide. It decomposes at lower temperatures and is easily adsorbed by the catalyst, with better adsorption effect than DMDS. Due to the lower decomposition temperature compared to DMDS, vulcanization reaction can be carried out at low temperatures, shortening the vulcanization time. Additionally, due to the certain molecular weight distribution of Di-tert-Butyl Polysulfide, the vulcanizing agent continuously decomposes during the vulcanization heating process, causing the hydrogenation catalyst to vulcanize slowly, Avoiding the concentrated heat release of the catalyst and the occurrence of hot spots in the bed temperature effectively protects the hydrogenation catalyst from thermal deactivation.
(4) The appearance of Di-tert-Butyl Polysulfide is a brown black liquid, which is easy to determine and verify the injection amount through a liquid level gauge during the vulcanization process.
