1. Insoluble sulfur will be converted into soluble sulfur when exposed to certain alkaline materials.
2. Long term exposure to higher temperatures (above 40 ℃) will convert it into relatively soluble rhombic crystal sulfur.
3. When in contact with any type of sulfonamide accelerator such as CBS, TBBS, DCBS, MBS, insoluble sulfur will quickly convert into soluble sulfur, as these accelerators release amines during storage.
4. Amine migration through polyethylene affects the stability of insoluble sulfur in sealed polyethylene bags.
5. Adding PVI can effectively stabilize Ins-S/TBBS/PVI premixes.
6. Can acid neutralize free amines, thereby stabilizing the desired mixture? The results indicate that salicylic acid cannot prevent the degradation of INS-S. In fact, due to the hydrolysis of sulfonamide to produce tert butylamine, it also promotes the degradation of insoluble sulfur.
7. Is mercaptobenzothiazole (non amine promoter) harmful to insoluble sulfur? Experiments have shown that MBT has no adverse effects on insoluble sulfur.
8. Insoluble sulfur is a fine powder that is sometimes difficult to disperse in rubber materials. Electrostatic agglomeration occurs during mixing, causing sulfur particles to agglomerate and not disperse uniformly. In addition, if the thick and fine particles partially melt and then agglomerate or harden, they will become viscous, further increasing the difficulty of dispersion.
9. One of the key factors for achieving good dispersion is the use of low processing temperature and rapid addition of insoluble sulfur.
10. In some cases, certain migration of the blending agent may be advantageous, as paraffin and para phenylenediamine antioxidants strongly rely on migration mechanisms to provide protection against ozone degradation in rubber product use. But in another case, diffusion through the interface between the adhesive material and the adhesive material can cause changes in material distribution, thereby adversely affecting the performance of the product. May cause changes in mechanical properties, decreased adhesion or aging resistance.