1. Base Polymer (Pib Raw Khoom)
Nruab nrab -Density Polyethylene (MDPE) cob
Feem ntau muab los ntawm ethylene los ntawm polymerization (feem ntau siv Ziegler-Natta lossis metallocene catalysts).
Qhov ntom ntom:0.926–0.940 g / cm³
Common cov khoom faib:
PEB 80(cov neeg laus, tseem siv dav)
PEB 100(lub zog siab dua, qee zaum sib tshooj rau hauv HDPE ntau yam tab sis tuaj yeem tsim rau MDPE tus cwj pwm)
2. Carbon Dub (rau cov kav dej dub)
Ntxiv ntawm ~ 2-2.5%
Muaj nuj nqi:
UV tsis kam (tiv thaiv polymer degradation sab nraum)
Txhim kho lub sij hawm ntev - durability
Particle loj thiab dispersion yog qhov tseem ceeb rau kev ua haujlwm
3. Antioxidants
Tiv thaiv thermal oxidation thaum lub sij hawm:
Extrusion txheej txheem
Ntev - lub neej ua haujlwm ntev
Feem ntau suav nrog:
Primary antioxidants (hindered phenols)
Secondary antioxidants (phosphites)
4. UV Stabilizers (rau Tsis yog -Dub Pipes)
Siv thaum cov kav dej muaj xim (piv txwv li, daj rau roj, xiav rau dej)
Alternatives los yog ntxiv rau carbon dub:
HALS (Hindered Amine Light Stabilizers)
5. Pigments / Masterbatches
Rau kev txheeb xyuas thiab coding:
Daj→ gas pipes
Xiav kab txaij→ dej haus
Yuav tsum tau sib haum nrog PE thiab tsis cuam tshuam cov khoom siv kho tshuab
6. Kev Pabcuam Ua Haujlwm (yeem)
Txhim kho extrusion stability thiab nto tiav
Piv txwv:
Lubricants
Anti-tus neeg saib xyuas
Cov yam ntxwv tseem ceeb ntawm cov khoom tiav
Kev sib xyaw ntawm cov khoom siv raw no muab MDPE kav:
Zoo heevyooj(zoo dua HDPE)
Siabcuam tshuam tsis kam, tshwj xeeb tshaj yog nyob rau hauv qis kub
Zooslow crack growth resistance (SCG)
ntseeg tautshuaj tiv thaiv
Daim Ntawv Ceeb Toom (Engineering Perspective)
Piv nrog HDPE:
MDPE muajqis zog tab sis siab dua ductility, ua rau nws preferable rau:
Gas faib tes hauj lwm
Installations yuav tsum tau khoov los yog av txav kam rau ua
