Qhov Tseem Ceeb - PVC vs HDPE
PVC thiab HDPE yog ob hom khoom siv hluavtaws polymeric uas siv rau hauv ntau daim ntawv thov kev lag luam. Qhov sib txawv tseem ceeb ntawm HDPE thiab PVC yog qhov sib txawv ntawm qhov ntom ntom; HDPE yog denser dua PVC, thiab qhov no ua rau muaj qhov sib txawv ntawm lawv lub cev thiab cov ntawv thov kev lag luam. Tsis tas li ntawd, qhov sib txawv ntawm cov qauv tshuaj thiab cov txheej txheem tsim khoom kuj tseem ua rau lawv qee yam khoom siv tshwj xeeb.
YPVC yog dab tsi?
PVC yog cov ntawv luv rau Polyvinyl Chloride. PVC yog qhov thib peb-feem ntau uas tsim cov khoom siv hluavtaws polymer, ib sab ntawm polyethylene thiab polypropylene. Nws yog cov khoom siv hluavtaws polymeric uas muaj nyob rau hauv ob hom: nruj thiab yoog raws. Daim ntawv ntshiab ntawm polyvinyl chloride yog cov xim dawb dawb uas yog insoluble hauv cawv, tab sis zoo soluble hauv tetrahydrofuran. Cov muaj pes tsawg leeg ntawm PVC yog li ntawm 57% ntawm cov tshuaj chlorine uas yog muab los ntawm qib industrial ntsev thiab li ntawm 43% carbon, feem ntau yog muab los ntawm cov roj thiab roj los ntawm ethylene. Yog li ntawd, PVC yog tsawg nyob ntawm cov roj crude los yog natural gas dua li lwm cov polymers. Chlorine muab PVC ua kom muaj hluav taws zoo heev.
YHDPE yog dab tsi?
HDPE stands rau High Density Polyethylene, thiab nws yog qhov ntom ntom ntom ntawm cov yas polyethylene. Piv nrog rau lwm hom (LDPE), nws yog ib qho nyuaj, muaj zog thiab hnyav me ntsis, tab sis tsis tshua muaj ductile thiab sib dua li dej. HDPE tuaj yeem molded, machined, thiab welded ua ke. Cov huab cua tsis kam ntawm HDPE tuaj yeem txhim kho los ntawm kev siv UV-stabilizers (carbon dub); tiam sis lawv yog xim dub.
HDPE yog tsim los ntawm roj av, thiab nws lub cev zoo li HDPE yog wax-zoo li, lustreless thiab opaque. Txawm hais tias HDPE yog cov khoom siv denser, nws tuaj yeem rov ua dua thiab muaj tus lej "2" rau nws cov lej cim npe.
YQhov txawv ntawm PVC thiab HDPE yog dab tsi?
Tshuaj Txheej Txheem ntawm PVC thiab HDPE
PVC: PVC yog tsim los ntawm polymerization ntawm vinyl chloride molecules.
Polyvinyl Chloride
HDPE: Lub polymerization ntawm ethylene molecules muab polyethylene polymer muaj cov qauv molecular ntawm -(C2H4)n–
YPolyethylene
Khoom ntawm PVC thiab HDPE
PVC los ntawm ob daim ntawv (txheej PVC - RPVC thiab hloov tau PVC - FPVC), thiab qee yam ntawm lawv cov khoom sib txawv me ntsis.
Density
PVC: RPVC (1.3–1.45 g cm-3) yog denser dua FPVC (1.1–1.35 g cm-3).
HDPE: HDPE muaj tus nqi loj rau lub zog-rau-qhov sib piv, thiab nws qhov ntom ntawm 0.93 g cm-3 txog 0.97 g cm- 3.
YThermal Conductivity
PVC: RPVC (0.14–0.28 Wm-1K-1) muaj ntau yam thermal conductivity thiab FPVC (0.14–0.17 Wm-1K-1) muaj qhov nqaim.
HDPE: Thermal conductivity ntawm HDPE yog nyob ib ncig ntawm 0.45 - 0.52 Wm-1K-1.
Mechanical Properties
PVC: Hardness thiab mechanical zog ntawm PVC yog qhov siab, thiab cov khoom siv kho tshuab nce raws li qhov hnyav molecular nce, thiab nws txo qis nrog qhov kub thiab txias. Thaum muab piv RPVC thiab FPVC, RPVC muaj cov khoom siv zoo.
HDPE: HDPE yog cov khoom siv tsis-linear viscoelastic thiab nws muaj lub sijhawm nyob ntawm lub sijhawm. Nws tuaj yeem tiv taus qhov kub thiab txias (120 0 C) rau lub sijhawm luv luv, tab sis nws tsis tuaj yeem tiv taus cov xwm txheej autoclaving li qub.
Daim ntawv thov ntawm PVC thiab HDPE
PVC: Raws li PVC muaj ob daim ntawv; PVC tawv thiab hloov tau yooj yim PVC, lawv tau siv rau hauv cov ntawv sib txawv raws li lawv cov khoom.
RPVC: Cov PVC tawv yog siv rau hauv kev tsim cov kav dej, lub raj mis, cov khoom ntim khoom tsis yog khoom noj, phaib (bank cards), qhov rooj thiab qhov rais.
FPVC: Cov PVC hloov tau yooj yim yog siv rau hauv ntau qhov chaw xws li cov kav dej, hluav taws xob cable rwb thaiv tsev, imitation tawv tsim, kos npe thiab hauv cov khoom lag luam. Ntxiv mus, nws yog lwm yam khoom siv rau roj hmab.
HDPE: HDPE yog siv los tsim ntau yam khoom yas; Qee qhov piv txwv yog cov nruas, jerricans, carboys, cov khoom ua si, cov khoom noj khoom haus, lub raj mis yas, cov kav dej tiv thaiv corrosion, geomembranes, yas lumber, tsev neeg thiab chav ua noj, cable rwb thaiv tsev, cov hnab nqa khoom, cov khoom ntim khoom noj.
Definition:
Thermoplastic: Lawv yog cov khoom siv lossis cov resins uas ua cov yas thaum cua sov thiab ua kom txias rau qhov txias; cov txheej txheem no tuaj yeem rov ua dua.
