Extrusion & Post
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Cross-linked polyethylene XLPE insufficient crosslinking degree (Variant: strengthened measures)
Fenómeno do problema
The crosslinking degree of XLPE products cannot reach the requirement of 60-80%, and the gel content is low.
Insufficient crosslinking degree affects the heat resistance and creep resistance of products, and products deform severely at high temperatures.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Análise das causas
(1) Peroxide addition insufficient or unevenly dispersed
(2) Crosslinking temperature too low or crosslinking time insufficient
(3) Peroxide decomposed prematurely (extrusion temperature too high)
(4) Irradiation crosslinking dose insufficient
(5) Silane crosslinking catalyst activity decreased
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solução
(1) Accurately meter peroxide dosage, ensure uniform dispersion
(2) Strictly control the crosslinking temperature and crosslinking time window
(3) Reduce extrusion temperature to 170-200°C to prevent premature peroxide decomposition
(4) Irradiation crosslinking ensures dose rate, total dose meets requirements
(5) Silane crosslinking checks catalyst and warm water crosslinking conditions (80-95°C water bath)
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Conclusão principal
The main cause of insufficient crosslinking degree is insufficient crosslinking agent dosage or improper crosslinking conditions, and strict control is needed from both formulation and process.
Targeted preventive measures need to be taken in different production scenarios.
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