High-density polyethylene
HDPE yeeb nkab yog cov yeeb nkab ua los ntawm high density polyethylene (HDPE). HDPE yeeb nkab yog ib qho khoom siv los hloov cov yeeb nkab steel thiab PVC cov yeeb nkab dej haus, uas muaj lub siab ua haujlwm zoo thiab tshuaj lom neeg ruaj khov, thiab tau siv dav hauv ntau lub raj xa dej.
Cov yam ntxwv tseem ceeb ntawm cov kav dej HDPE suav nrog lawv cov crystallinity siab, tsis yog-polar thiab thermoplastic resin zog. Cov tsos ntawm thawj HDPE yog milky dawb, thiab nws yog translucent mus rau ib tug tej yam nyob rau hauv ib tug nyias cross-section. Cov khoom muaj kev tiv thaiv zoo rau feem ntau cov tshuaj hauv tsev thiab kev lag luam, tab sis qee yam tshuaj xws li corrosive oxidants (xws li, concentrated nitric acid), aromatic hydrocarbons (xws li, xylene), thiab halogenated hydrocarbons (xws li, carbon tetrachloride) tuaj yeem ua rau cov tshuaj corrosion. . Tsis tas li ntawd, HDPE muaj cov khoom siv hluav taws xob zoo heev, tshwj xeeb tshaj yog lub zog dielectric siab ntawm rwb thaiv tsev, ua rau nws haum rau cov xov hlau thiab cables. HDPE nrog cov qib nruab nrab mus rau qib siab molecular hnyav muaj qhov cuam tshuam zoo heev ntawm chav tsev kub thiab txawm tias qhov kub thiab txias.
HDPE kav dej muaj ntau yam kev siv, suav nrog tab sis tsis txwv rau kev siv dej, kev tso dej, kev ua liaj ua teb, thiab lwm yam. Nws tuaj yeem tiv taus qee qhov siab, thiab feem ntau yog ua los ntawm PE resin nrog qhov hnyav molecular thiab zoo txhua yam khoom. Txawm hais tias tsawg-density polyethylene (LDPE) resin feem ntau yog siv los tsim cov kav dej haus vim nws cov ntsuas kev nyiam huv, nws tsis tshua muaj zog tensile, sib txawv siab tsis kam thiab tsis zoo rigidity tsis haum raws li cov khoom siv rau cov kav dej siab. Hauv qhov sib piv, HDPE kav dej muaj lub peev xwm thauj khoom siab vim lawv cov phab ntsa zoo nkauj thiab cov khoom tsis muaj nplaum, txo qhov siab poob ntawm cov kav dej thiab kev siv zog ntawm kev thauj mus los hauv dej. Tsis tas li ntawd, cov kav dej HDPE yog sib zog dua li cov kav dej ua vaj tse, cov kav dej galvanized thiab cov kav hlau steel, uas yooj yim rau kev tswj thiab txhim kho, uas txo cov nqi installation ntawm qhov project.