Various solutions for rubber product frost spraying:
1. High temperature baking;
2. Chemical reagent wiping (temporary solution); 3 roughened surface (matte). Otherwise, the overall formula is caused by the Supersaturation of the reagent sprayed (precipitated) from the surface.
3. The phenomenon of liquid or solid compounding agents inside rubber or vulcanized rubber precipitation on the surface of rubber products due to migration, forming a cloud like or white powder substance. This is caused by the use of sulfur, paraffin, certain antioxidants, and softeners exceeding their solubility in rubber.
4. Select the appropriate high-temperature vulcanization temperature and time based on the characteristics of the raw rubber and the blending agent.
① The vulcanization temperatures of NR, oil-filled SBR, CR, SBR, and NBR should not exceed 240,250,260,300 and 300 ℃, respectively.
② The effective and semi effective curing systems are selected as the curing system (mainly forming single sulfur bond and Disulfide bond with good heat resistance); The sub Sulfonamide or thiazole type accelerators are selected as the main accelerators, and the guanidine or thiuram type accelerators are selected as the auxiliary accelerators; Using sulfur donors (such as vulcanizing agent DTDM) to partially replace sulfur.
③ Additives such as pine tar, asphalt, rosin, and liquid coumarone resin that have a certain dissolution and wetting effect on the powder are used
5. The reason for rubber frosting is that the amount of ingredients exceeds the saturation range of the rubber. If you experience frosting due to antioxidants, you can use different types of antioxidants together. Also, you need to ensure that the ingredients are evenly dispersed in the mixing process. Rubber homogenizers and dispersants can also be added.