During the production of cross-linked polyethylene cables, early cross-linking often occurs. What causes this phenomenon and how can it be solved?

During the production of cross-linked polyethylene cables, early cross-linking often occurs. What causes this phenomenon and how can it be solved?


At present, the silane crosslinking method is commonly used in the production of cross-linked polyethylene cables. In the silane crosslinking process, antioxidant 1010 and distearyl thiodipropionate are often used in the formula to form a synergistic system. The commonly used dispersant is a low-molecular-weight liquid compatible with polyethylene, such as liquid paraffin. The commonly used catalysts are mainly organotin compounds. The choice of catalyst in the formula has a significant impact on the crosslinking time. When organotin and other catalysts are used, premature crosslinking is prone to occur, resulting in charring, which affects further processing and product performance.
The solutions are: using ester peroxides (such as tert-butyl peroxide isononyl ester) as initiators and metal oxides (such as zinc oxide, tin oxide, etc.) as condensation catalysts, which can achieve fast crosslinking and eliminate the need for warm water or steam crosslinking processes; or using the polymer of dibutyltin as a hydrolysis condensation catalyst to replace the commonly used dibutyltin dilaurate, which can enhance the activity of the catalyst and achieve uniform crosslinking.
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