Qhov kub thiab txias ib puag ncig puas tuaj yeem ua rau PC qhov rooj vaj huam sib luag tso tawm cov khoom tsis zoo?
PC qhov rooj vaj huam sib luag tau dav siv hauv tsev cia khoom, chaw ua haujlwm hauv chaw kuaj mob, cov khoom siv kho mob, thiab lwm yam xwm txheej vim lawv qhov cuam tshuam tsis zoo, pob tshab zoo, thiab cov khoom siv tu yooj yim. Raws li lub caij kub kub los txog los yog nyob rau hauv ib puag ncig ze rau qhov chaw tshav kub, txawm tias PC qhov rooj vaj huam sib luag yuav tso tawm cov khoom tsis zoo tau dhau los ua qhov kev txhawj xeeb tseem ceeb rau cov neeg siv. Qhov tseeb, qhov teeb meem no yuav tsum tau txiav txim siab raws li cov yam ntxwv ntawm kev tiv thaiv tshav kub, muaj peev xwm txaus ntshai, thiab cov khoom lag luam zoo ntawm cov ntaub ntawv PC, thiab tsis tuaj yeem hais dav dav.
Los ntawm qhov kev xav ntawm qhov kub tsis kam ntawm PC cov ntaub ntawv, lawv muaj kev ruaj ntseg thermal stability thiab qhov pom tseeb ntawm qhov kub thiab txias. Kev siv lub sij hawm ntev kev nyab xeeb kub ntawm cov pa PC rooj vaj huam sib luag yog 120-130 ℃. Thaum qhov kub nce mus txog 140-150 ℃, cov khoom maj mam hloov ntawm lub xeev nyuaj mus rau lub xeev mos. Txhawm rau txhawb nws cov decomposition thiab tso tawm cov khoom, qhov kub yuav tsum ncav cuag 290 ℃ lossis siab dua. Cov yam ntxwv no txhais tau hais tias nyob rau hauv cov xwm txheej kub txhua hnub, nws qis dua qhov kub ntawm cov khoom siv PC, thiab cov qauv molecular ntawm PC qhov rooj vaj huam sib luag tseem nyob ruaj khov, ua rau nws nyuaj rau tso cov khoom tsis zoo.
Txawm li cas los xij, tseem muaj ob qhov kev pheej hmoo uas cuam tshuam nrog PC qhov rooj vaj huam sib luag hauv qhov chaw kub kub, tab sis qib ntawm kev pheej hmoo tuaj yeem tswj tau los ntawm kev xaiv cov khoom lag luam thiab cov xwm txheej siv. Thawj hom yog qhov teeb meem ntawm kev tsiv teb tsaws ntawm bisphenol A. Qee cov ntaub ntawv PC yuav khaws cov lej ntawm bisphenol A thaum lub sijhawm tsim khoom, thiab kev tso tawm cov tshuaj no nyob rau hauv chav tsev kub tsis tshua muaj siab, uas ua tau raws li cov qauv kev nyab xeeb. Txawm li cas los xij, qhov nce hauv qhov kub thiab txias yuav ua rau lawv cov neeg tsiv teb tsaws chaw. Thaum lub ambient kub siab tshaj 80 ℃, tso tawm ntawm bisphenol A yuav ho nce, thiab lub boiling dej ib puag ncig ntawm 100 ℃ yuav ntxiv tus nqi no. Tam sim no, feem ntau cov tuam txhab lag luam hauv kev lag luam tau tshaj tawm PC rooj vaj huam sib luag yam tsis muaj bisphenol A, ntxiv txo cov kev pheej hmoo.
Qhov thib ob hom kev pheej hmoo yog cuam tshuam nrog cov khoom siv ntxiv thaum lub sijhawm tsim khoom. Txhawm rau txhim kho qhov ua tau ntev thiab tiv thaiv yellowing peev xwm ntawm PC qhov rooj vaj huam sib luag, ib qho me me ntawm cov khoom xyaw xws li antioxidants thiab toughening agents raug ntxiv thaum lub sij hawm tsim khoom. Cov Cheebtsam no ruaj khov ntawm qhov kub thiab txias, tab sis thaum lub ambient kub mus txog lub thermal deformation kub ntawm PC cov ntaub ntawv, ob peb pab neeg ua hauj lwm tej zaum yuav raug hloov tshuaj me ntsis thiab qee zaus tsim cov kab mob ntawm cov tshuaj lom. Txawm li cas los xij, cov xwm txheej zoo li no tsuas yog tshwm sim nyob rau hauv qhov kub thiab txias ib puag ncig, thiab nws tsis tshua muaj qhov kub thiab txias kom ncav cuag hauv tsev txhua hnub, chaw ua haujlwm, lossis cov xwm txheej kev lag luam. Yog li ntawd, tsis tas yuav txhawj xeeb ntau dhau hauv kev siv tswv yim.
Cov khoom lag luam zoo yog qhov tseem ceeb hauv kev txiav txim siab kev nyab xeeb ntawm PC qhov rooj vaj huam sib luag hauv qhov chaw kub kub. Qhov zoo ntawm PC rooj vaj huam sib luag yog tsim los ntawm cov khoom siv raw khoom tshiab, nruj me ntsis tswj cov seem ntawm bisphenol A, thiab ntxiv cov neeg ua haujlwm pabcuam uas ua raws li cov qauv kev lag luam. Lawv kuj tau dhau los ua kev kub ntxhov thiab kev ntsuas kev nyab xeeb; Txawm li cas los xij, qee qhov tsis zoo ntawm PC qhov rooj vaj huam sib luag ua los ntawm cov khoom siv rov ua dua tsis tau tsuas yog txo cov cua sov, tab sis kuj tseem tuaj yeem ua rau muaj kev pheej hmoo ntawm cov khoom tsis zoo tso tawm ntawm qhov kub siab vim yog impurities hauv cov khoom siv raw lossis cov khoom siv tsis raug. Tsis tas li ntawd, kev laus ntawm PC qhov rooj vaj huam sib luag tuaj yeem cuam tshuam kev nyab xeeb. Yog hais tias lub qhov rooj vaj huam sib luag qhia kev laus tseem ceeb, lawv cov qauv molecular stability yuav txo qis, thiab qhov tshwm sim ntawm kev tso tawm cov khoom nyob rau hauv qhov kub thiab txias ib puag ncig yuav nce ntxiv.
Zuag qhia tag nrho, seb PC qhov rooj vaj huam sib luag tso tawm cov khoom tsis zoo nyob rau hauv qhov chaw kub kub nyob ntawm qhov sib xyaw ua ke ntawm qhov kub thiab txias, lub sijhawm, thiab cov khoom zoo. Hauv cov xwm txheej siv niaj hnub, cov rooj sib tham PC uas tsim nyog tuaj yeem tiv taus qhov kub thiab txias uas tsis tshua muaj kev pheej hmoo ntawm kev tso tawm cov tshuaj phem; Tsuas yog nyob rau hauv huab cua kub ib puag ncig ze lossis tshaj cov khoom siv thermal deformation kub, lossis thaum siv lub qhov rooj PC tsis zoo los yog hnub nyoog, yuav tsum tau ceeb toom txog kev pheej hmoo. Cov neeg siv tsis tas yuav ntxhov siab heev. Lawv tsuas yog yuav tsum xaiv PC qhov rooj vaj huam sib luag uas ua tau raws li cov qauv kev nyab xeeb los ntawm cov kev raug cai, tsis txhob cuam tshuam ntev rau qhov kub siab tshaj 130 ℃, kom ntseeg tau tias kev siv nyab xeeb.