Dab tsi yog qhov txawv ntawm kev ua haujlwm ntawm cov kav dej ua los ntawm cov khoom yas sib txawv (thib ob)
Peb, PE polyethylene
Polyethylene yog ib hom thermoplastic yas 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 cov yeeb yaj kiab thiab cov fibers, thaum HDPE lossis MDPE feem ntau yog siv hauv cov yeeb nkab ntau lawm uas cuam tshuam nrog kev txhaj tshuaj molding.
PE raj feem ntau yog dub thiab feem ntau yog siv los thauj cov dej txias.
Hauv kev tsim cov kav dej, vim tias qhov tsis zoo ntawm cov khoom siv hluav taws xob ntawm polyethylene, yog li nyob rau qee lub sijhawm xav tau (xws li cov tshuab cua sov), nws yuav tsum tau hloov kho, yog li muaj 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 kev faib tawm ntawm cov saw hlau sab kom tau ib tug tshwj xeeb molecular qauv, los txhim kho lub tshav kub tsis kam ntawm PE.
Pe-x yog hais txog kev sib txuas ntawm polyethylene. Kev sib txuas sib txuas ua rau cov kab hluav taws xob macromolecular ntawm polyethylene ua ib qho kev sib txuas ntawm peb sab, yog li kev txhim kho nws cov cua sov ua haujlwm thiab nkag siab. Crosslinked polyethylene tsis yog thermoplastic thiab tsis tuaj yeem kub-fused. Tam sim no, kev lag luam PE-X suav nrog 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 lawv tau txais cov txheej txheem sib txawv hauv kev sib txuas sib txuas.
Pe-rt thiab PE-X feem ntau yog siv los ua cov kav dej hauv pem teb.
Plaub, PVC PVC
Polyvinyl chloride yog ib qho ntawm cov khoom siv yas siv ntau tshaj plaws, uas yog tsim los ntawm polymerization ntawm vinyl chloride monomer.
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.
Qhov txawv ntawm qhov muag thiab tawv polyvinyl chloride yog tias tsis muaj plasticizer ntxiv. Mos PVC muaj cov yas yas, uas feem ntau yog siv rau hauv pem teb, qab nthab thiab tawv tawv, tsis zoo lub cev thiab cov khoom siv kho tshuab.
Hard polyvinyl chloride (PVC-U) tsis muaj cov yas ntxiv yog feem ntau siv los ua cov kav dej. Tam sim no, feem ntau siv yog cov kav dej thiab hluav taws xob casing. Cov kav dej ntawm PVC-U feem ntau tsis txuas nrog kub yaj, tab sis txuas nrog cov nplaum.
Cov saum toj no piav qhia txog qee cov khoom siv yas siv hauv kev tsim 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 saum toj no.
