Cov khoom siv ob yog ua los ntawm cov khoom siv tib yam, tab sis cov khoom sib txawv ntawm cov khoom sib txawv, lub xeev molded yog mos ntawm ib sab thiab tawv rau lwm yam.
PVC hnab yas
Lub ntuj xim yog yellowish translucent thiab ci iab.Transparency zoo dua polyethylene thiab polypropylene, tab sis tsawg dua polystyrene.Nyob ntawm tus nqi ntawm cov khoom ntxiv, nws tuaj yeem muab faib ua cov mos thiab tawv polyvinyl chloride.Cov khoom muag muag muaj qhov yooj, toughness thiab stickiness.Lub hardness ntawm cov khoom tawv yog cov uas tsis muaj polyethylene, tab sis yog hais tias nws yog qis dua polypropylene, whitening yuav tshwm sim ntawm khoov.Cov khoom siv: cov phaj, cov kav dej, cov hauv qab, cov khoom ua si, qhov rooj thiab qhov rais, cov ntaub qhwv hlau, ntawv sau, thiab lwm yam. Nws yog cov khoom siv polymer uas siv cov tshuaj chlorine atoms es tsis txhob siv hydrogen atoms hauv polyethylene.
Cov khoom siv tshuaj lom neeg thiab lub cev ntawm PVC (Polyvinyl Chloride) Hard PVC yog ib qho ntawm cov khoom siv dav siv ntau tshaj plaws.Cov khoom siv PVC yog cov khoom siv amorphous.Hauv kev siv cov ntaub ntawv PVC tiag tiag, stabilizers, lubricants, auxiliary kho, pigments, impactors thiab lwm yam additives feem ntau ntxiv [2].
PVC khoom yog nonflammable, muaj zog, huab cua resistant thiab muaj zoo heev geometric stability.PVC muaj zog tiv taus oxidizing cov neeg ua haujlwm, txo cov neeg ua haujlwm thiab muaj zog acids.Txawm li cas los xij, nws tuaj yeem raug corroded los ntawm cov concentrated oxidizing acids xws li concentrated sulfuric acid thiab concentrated nitric acid, thiab tsis haum rau kev sib cuag nrog cov tshuaj tsw qab lossis chlorinated hydrocarbons.
Lub melting kub ntawm PVC thaum lub sij hawm ua yog ib tug txheej txheem tseem ceeb heev parameter.Yog tias qhov ntsuas no tsis tsim nyog, cov khoom siv decomposition teeb meem yuav tshwm sim.Cov khoom ntws ntawm PVC tsis zoo heev thiab nws cov txheej txheem yog nqaim heev.Tsawg molecular hnyav PVC cov ntaub ntawv feem ntau yog siv, tshwj xeeb tshaj yog vim hais tias siab molecular hnyav PVC cov ntaub ntawv yog ib qho nyuaj rau txheej txheem (cov khoom no feem ntau yuav tsum tau ntxiv cov lubricants los txhim kho cov dej ntws).Lub shrinkage tus nqi ntawm PVC yog tsawg heev, feem ntau 0.2-0.6%.
Post lub sij hawm: Oct-20-2021
