For wire and cable applications, moisture-cured XLPE and mineral filled polyolefins or rubbers are used. For these applications as well as for moisture-cured PEX-b pipes, silanes are indispensable. Through crosslinking, the thermodimensional stability of polyethylene (PEX) can be significantly improved.
With Dynasylan® SILFIN we provide a wide range of ready-to-use products for the wire, cable and pipe industry but also for other thermoplastic applications. With these easy to dose liquid products, we offer tailor-made blends consisting of all necessary ingredients for grafting and crosslinking of polyethene resulting in PEX and XLPE. These products contain vinyl silanes and initiators for the two-step SIOPLAS® process and additionally crosslinking catalysts plus in some cases other additives like antioxidants, metal deactivator, processing aids, etc. for the one-step process (Monosil®).
LONG LIFETIME OF DRINKING WATER PIPES WITH DYNASYLAN® SILFIN 50
Silane crosslinking increases the lifetime of inhouse water piping systems considerably – and reliably – at high continuous service temperatures. At elevated temperatures, non-crosslinked polyethylene is easily deformed. Silane-crosslinked polyethylene high density pipes show a significant weight reduction and greater resistance to crack formation. Other crucial advantages are improved corrosion, wear, and thermal resistance as well as significantly reduced laying costs.
Silanes are needed as
- Adhesion promoters and coupling agent for highly filled compounds
- Grafting & crosslinking additives for grafted polyethylene (PEg) resulting in PEX pipes or XLPE cables
Multifunctional silanes with their tailor-made oligomeric structure provide different benefits: Significantly reduced alcohol release (low VOC–low volatile organic component)
- Combination of different functionalities in one molecule like vinyl, alkyl, amino, and diamino groups
- High flashpoint
- Safer handling and storage, additional safety during production
- No loss of material even at elevated compounding conditions