Cov khoom siv yas sib txawv ua cov khoom siv, qhov txawv ntawm qhov ua tau zoo li cas? ntxiv
PE polyethylene
Polyethylene yog ib qho thermoplastic polymerized los ntawm ethylene, nws tsis muaj tshuaj lom, tsis muaj ntxhiab, zoo li siv quav ciab, kub tsis kam, tshuaj lom neeg ruaj khov zoo heev.
Polyethylene feem ntau muaj tsawg ntom polyethylene (LDPE), nruab nrab ntom polyethylene (MDPE) thiab siab ceev polyethylene (HDPE), lawv daim ntawv thov tsis zoo ib yam. LDPE feem ntau yog siv los tsim cov khoom hnyav xws li zaj duab xis thiab fiber ntau, thaum cov yeeb nkab ntau lawm nrog kev txhaj tshuaj molding feem ntau yog HDPE lossis MDPE.
PE yeeb nkab feem ntau yog dub thiab feem ntau yog siv rau kev xa dej txias.
Hauv kev tsim cov kav dej, polyethylene tsis zoo hauv cov cua sov, yog li nyob rau qee lub sijhawm xav tau ntau dua (xws li cua sov), nws yuav tsum tau hloov kho, yog li pe-RT thiab PE-X.
Pe-rt yog hais txog cov polyethylene tshav kub-resistant, uas siv ethylene thiab octene copolymerization txoj kev, los ntawm kev tswj tus naj npawb thiab tis ntawm sab saw kom tau ib tug tshwj xeeb molecular qauv, los txhim kho cov tshav kub tsis kam ntawm PE.
Pe-x yog hais txog crosslinked polyethylene, uas hloov nws cov qauv linear macromolecular mus rau hauv peb-dimensional network qauv, yog li txhim kho nws cov cua sov ua haujlwm thiab nkag siab tsis kam. Xlpe tsis yog thermoplastic thiab tsis tuaj yeem kub yaj. Tam sim no, pe-X muaj pe-XA, PE-XB thiab PE-XC. Nws yog tsim nyog sau cia tias a thiab B ntawm no tsis yog hais txog cov khoom qib A lossis B, tab sis cov txheej txheem siv hauv kev sib txuas sib txuas sib txawv.
Pe-rt thiab PE-X feem ntau yog siv los ua cov kav dej hauv pem teb.
PVC polyvinyl tshuaj dawb
Polyvinyl chloride (PVC) yog ib qho ntawm feem ntau siv cov khoom yas.
Polyvinyl chloride (PVC) kub thiab lub teeb ruaj khov, nyob rau hauv ntau tshaj 100 degree los yog lub hnub ntev, tuaj yeem tsim hydrochloric acid decomposition, thiab ntxiv tsis siv neeg catalytic decomposition, ua rau discoloration thiab mechanical kev ua tau zoo degradation, stabilizer yuav tsum tau ntxiv rau hauv daim ntawv thov. txhawm rau txhim kho qhov ruaj khov ntawm cov cua sov thiab lub teeb, kev xaiv ntawm stabilizer yog tus yuam sij rau nws qhov zoo thiab kev nyab xeeb.
Ntawm PVC mos tawv ib xees, qhov sib txawv nyob ntawm qhov tsis tau ntxiv cov yas yas, cov yas yas yog muaj nyob rau hauv mos PVC, nws yog siv nyob rau hauv lub nto txheej ntawm pem teb, qab nthab thiab tawv feem ntau, lub cev mechanical kev ua tau zoo tsis zoo.
Hard polyvinyl chloride (PVC-U) tsis muaj cov yas ntxiv yog feem ntau siv los tsim cov kav dej. Tam sim no, cov khoom siv dav siv ntau tshaj plaws yog cov kav dej thiab hluav taws xob casing. Cov kav dej pvc-u feem ntau tsis yog koom nrog kub yaj, tab sis los ntawm cov nplaum.
Cov saum toj no piav qhia txog qee cov yas siv los ua cov kav dej. Ntxiv rau cov ntaub ntawv no, muaj lwm cov ntaub ntawv, tab sis lawv tsis tau siv dav, qhov tseem ceeb tshaj plaws yog cov ntaub ntawv no.
