Kev kawm txog UV tiv thaiv kev ntsuas rau PPR yeeb nkab fittings

Uuv cov kev cuam tshuam hauv cov ntaub ntawv PPR

PPR foregoes Yees duab-oxidatative tsis zoo thaum raug rau UV hluav taws xob ({1}}}}}} {% tom qab pib sab nraum zoov kis. FTIR kev tsom xam qhia cov pab pawg carbonyL tsim (ncov ntawm 1715cm⁻¹) qhia oxidation. Qhov kev cuam tshuam ua raws cov arrhenius kinetics, nrawm nrawm los ntawm 2.3 zaug ib 10 degree kub nce.

 

Cov ntsuas tseem ceeb ua tau zoo

Cov tsis tseem ceeb cuam tshuam:

Lub zog tensile txo: {0. 8% rau 1000kj \/ m² UV koob tshuaj

Yellowing index (ΔYI): >15 Tom qab 2000 teev QT xeem

Nrib pleb: pom ntawm 0. 5% lim tom qab ntev kis

Hydrostatic siab kuj: txo qis 25% sai dua li kev tiv thaiv kav

 

Stabilizer Addifferive Tsim

Siv tau UV kev tiv thaiv cov tshuab suav nrog:

Hindered amine lub teeb cigilizers (hales): {{}}. 3-0. 5% concentration

Carbon dub: {2-2. 5% rau kev sib cais zoo tshaj plaws

Nano-tio₂: 1% muab 95% UV Kev Txhim Kho

Benzotriazole UV nqus: {{{}}. {1-0. 3 hli nkag tob

Kev Tiv Thaiv Txheej Txheej Technologies

Ntau txheej txheej daws teeb meem pom kev ua haujlwm zoo dua:

Base Txheej: Epoxy-Hloov Acrylic ({1} μm)

Nruab Nrab Txheej: UV-Kho Polyurethane ({{1} μm)

Lub tsho tiv no: fluoropolymer ({20-30 μm) Xenon ARC Test

 

Kev Tiv Thaiv Kev Tiv Thaiv

Cov txheej txheem teb tau pov thawj:

UV-Resistant Tsho (LDPE nrog carbon dub)

Cov Khoom Tiv Thaiv Kev Tiv Thaiv (Yam tsawg kawg 3mm Phab Ntsa Thickness)

Burial depth >{{0 {0}}. 5m rau Kev Zam Kev Zam Txim

Sab qaum teb-ntsib kev teeb tsa tau raug los ntawm 35%

 

Nrim siab laus laus kev ntsuam xyuas cov txheej txheem

Kev Ntsuam Xyuas Cov Qauv:

Iso {{{0}}} (quav): 0.77w \/ m² ntawm 340nm

Iso 16474-3 (Xenon Arc)

REO-SIJHAWM saib xyuas siv UV Dosimeters Correlation Qhov tseeb: 1 teev quav ≈ 15 hnub florida kis

Kev Ua Phem Ua Qauv Ua Qauv

Kev ua lej qauv:

Lub Sij Hawm Kub-Uv koob tshuaj rau ib qho

Monte carlo simulation rau kev sib tw tawg

Cov lus pom zoo ntawm kev ntxhov siab ntawm kev faib tawm cov lus pom zoo 85% tseeb hauv {1}}} xyoo kwv yees kev twv.

 

Kev Txij Nkawm thiab Kev Ntsuam Xyuas Cov Ntawv Sau

Cov kev pom zoo:

Kev soj ntsuam txhua xyoo rau saum npoo crazing

Biannual Tensile Testing (5% tus qauv ntsuas)

Kev Tshawb Xyuas Spectrophotometric txhua 3 xyoos

Replacement criteria: ΔYI>20 lossis 15% lub zog poob

Nyem ntawm no kom saib ntau cov yeeb yaj kiab

Nyem ntawm no Saib ntxiv peb cov ntaub ntawv xov xwm!

Nyem qhov no los tiv tauj peb!