Daim ntawv qhia ntxaws txog cov khoom siv thoob yas

High -Density Polyethylene
Cov khoom siv rau tshuab-cov thawv yas molded hollow yog tsawg-siab siab-density polyethylene-tseem hu ua HDPE. High-Density Polyethylene (lub npe hu ua "HDPE") yog ib qho uas tsis yog-polar thermoplastic resin cim los ntawm siab crystallinity. Nyob rau hauv nws lub xeev ntuj, HDPE zoo li milky dawb; nyob rau hauv nyias cross-sections, nws muaj ib tug tej℃ntawm translucency. PE muaj kev tiv thaiv rau feem ntau ntawm tsev neeg thiab cov khoom siv tshuaj. Txawm li cas los xij, qee yam tshuaj muaj peev xwm ua rau cov tshuaj tiv thaiv corrosion{11}} piv txwv xws li corrosive oxidants (xws li concentrated nitric acid), aromatic hydrocarbons (xws li xylene), thiab halogenated hydrocarbons (xws li carbon tetrachloride). Cov polymer no tsis yog -hygroscopic thiab pom zoo tiv thaiv dej vapor, ua rau nws tsim nyog rau kev ntim cov ntawv thov. HDPE kuj muaj lub zog dielectric siab thiab rwb thaiv tsev, ua rau nws haum rau siv hauv cov xov hlau hluav taws xob thiab cables. Cov qib nrog qhov nruab nrab mus rau siab molecular luj pom muaj kev cuam tshuam zoo heev. Cov khoom tshwj xeeb ntawm ntau qib HDPE yog txiav txim siab los ntawm kev sib xyaw ntawm plaub qhov sib txawv: qhov ntom ntom, molecular hnyav, molecular hnyav faib, thiab cov khoom ntxiv. Txawv catalysts yog ua hauj lwm los tsim cov polymers nrog customized, tshwj xeeb cov khoom. Kev sib cuam tshuam ntawm cov kev hloov pauv no ua rau muaj ntau yam HDPE qib uas haum rau cov ntawv thov tshwj xeeb.

High-Density Polyethylene muaj cov uas tsis yog- lom, tsis muaj ntxhiab, thiab saj tsis qab granules. Nws muaj qhov melting point ntawm kwv yees li 130℃thiab qhov txheeb ze qhov sib txawv ntawm 0.941 txog 0.960. Nws nthuav tawm ob qho tib si txias thiab kub tsis kam; yas nruas tsim los ntawm cov khoom no feem ntau muaj cov qauv kev khiav hauj lwm kub ntawm -50℃mus rau +70 degree, nrog rau lub sij hawm luv luv kub tsis kam mus txog li ntawm 100℃[9]. Tsis tas li ntawd, nws qhia tau hais tias zoo heev tshuaj stability, siab rigidity thiab toughness, thiab superior mechanical zog. Nws cov khoom dielectric thiab tsis kam rau ib puag ncig kev ntxhov siab tawg kuj zoo heev.

Qhov pom zoo melting kub ntau rau kev ua haujlwm yog 220℃txog 260 degree. Rau cov ntaub ntawv uas muaj qhov hnyav dua molecular, qhov kub ntawm qhov kub ntawm 200℃thiab 250℃raug pom zoo.

Polypropylene
Polypropylene (abbreviated li "PP") yog lwm yam thermoplastic resin feem ntau siv hauv kev tsim cov nruas yas [12]. PP nta lub siab melting point txog li 167℃thiab yog ob qho tib si tsis yog - lom thiab ntxhiab tsw [4].