Qhov sib txawv ntawm cov khoom pab ua PVC, cov khoom siv yas, thiab cov roj nplua nyeem yog dab tsi?

Vim tias cov khoom siv ua PVC sib xws nrog PVC heev thiab muaj qhov hnyav molecular siab (kwv yees li (1-2) × 105-2.5 × 106g/mol) thiab tsis muaj hmoov txheej, lawv raug cua sov thiab sib tov thaum lub sijhawm molding. Lawv ua ntej ua kom cov khoom siv resin nyob ib puag ncig mos thiab nruj. Los ntawm kev sib txhuam thiab kev hloov pauv cua sov, kev yaj (gel) raug txhawb nqa. Qhov viscosity ntawm cov yaj tsis txo qis, lossis txawm tias nce ntxiv; Vim yog kev sib txuas ntawm cov saw hlau molecular, qhov elasticity, lub zog, thiab kev nthuav dav ntawm PVC tau zoo dua.

Ntxiv mus, vim tias cov khoom sib xws thiab tsis sib xws ntawm PVC yog cov khoom siv ua haujlwm nrog lub plhaub tseem ceeb. Feem ntau, nws tsis sib xws nrog PVC thiab yog li ntawd ua haujlwm ua cov roj nplua nyeem sab nraud, tab sis tsis ua rau muaj av thiab tsim cov nplai, uas muaj kev cuam tshuam qeeb rau kev yaj. Yog li ntawd, raws li cov yam ntxwv ntawm daim ntawv thov no, cov khoom siv ua haujlwm PVC tuaj yeem muab faib ua ob pawg: universal thiab lubricating. Lub luag haujlwm ntawm cov khoom siv ua haujlwm PVC universal yog los txo qhov kub yaj, txhim kho lub zog thermal thiab kev sib xws, txo qhov tawg ntawm yaj, thiab muab kev ywj pheej ntau dua. Cov haujlwm no muaj txiaj ntsig zoo rau kev ua haujlwm PVC: txo qhov kub yaj txhais tau tias ncua lub sijhawm thermal stability, muab qhov kev nyab xeeb rau kev siv cov khoom siv rov ua dua, thiab tso cai rau kev ua tiav ntxiv; Txhim kho lub zog thermal thiab txo qhov tawg ntawm yaj, uas txhais tau tias nws tuaj yeem ua kom ceev ceev ua tiav, ua kom nrawm dua traction, thiab tseem txhim kho qhov zoo thiab kev ua tau zoo; Txhim kho qhov sib xws ntawm cov yaj, uas tuaj yeem txo qhov ripples ntawm qhov chaw thiab kev tawg ntawm cov khoom extruded, yog li ua rau muaj kev tsim khoom ntau dua, txhim kho ductility thiab thermoformability.