Tsis ntev tas los no, tus kab mob tshiab txog tus kabmob hu ua kabmob hnoos hawbpob uas tau tshawb pom nyob hauv Qingdao tau ua rau muaj kev txhawj xeeb thoob plaws lub ntiaj teb. Ib tsab xov xwm txaus siab yog tias nyob hauv tsawg dua tsib hnub txij li kev tshawb pom ntawm peb tus neeg muaj mob asymptomatic thaum Lub Kaum Hli 11 txog 18:00 rau hnub 14, ze li 9 lab daim ntawv luam ntawm tus kabmob tshiab nucleic acid tau raug sampling hauv Qingdao. Txog tam sim no, 5410386 cov ntawv luam tawm ntawm cov txiaj ntsig tau lawm. Ntxiv nrog rau 12 qhov xwm txheej uas tau lees paub, tsis muaj qhov ntsuas pom zoo tshiab lawm. Nws nkag siab tias Qingdao Libao yuav ua tiav qhov kev tshawb nrhiav ntawm 11 lab cov tib neeg hauv lub nroog los ntawm 16.
Hauv ib nrab xyoo dhau los, Tuam Tshoj tau tshawb nrhiav cov txheej txheem kev tiv thaiv thiab tswj cov txheej txheem los tiv thaiv kev kis mob.
Nws tuaj yeem hais tau tias ib qho cuab yeej loj los tiv thaiv kev sib kis ntawm tus kab mob huab cua yog lub npog ncauj. Daim npog ntsej muag tau dhau los ua kev tu ncua txhua hnub. Nws tsis tuaj yeem tsuas lim cov kab mob thiab kab mob hauv huab cua, tab sis kuj tseem thaiv kev kis tus kab mob thiab kab mob ntawm tus neeg hnav.
Mown blown daim ntaub ua lub luag haujlwm tseem ceeb hauv tus qauv ntawm lub npog ntsej muag, thiab cov khoom siv tseem ceeb yog polypropylene. Yog li polypropylene los qhov twg los?
Cov txheej txheem ntau lawm polypropylene
Cov txheej txheem cov txheej txheem ntawm polypropylene tau muab cais ua cov pawg hauv qab no: txoj kev daws teeb meem, txoj kev daws teeb meem, kua theem cov txheej txheem thiab roj theem cov txheej txheem.
Cov txheej txheem kuab tshuaj polymerization: propylene monomer yog yaj nyob rau hauv ib qho inert kua theem hnyav thiab polymerized hauv cov kuab tshuaj raws li kev ua ntawm catalyst. Lub polymer yog tshem tawm hauv qhov hnyav hauv lub xeev ntawm cov khoom thauj khoom tawg yooj yim.
Kev daws cov tshuaj polymerization: siv cov kub kub taw qhia ncaj qha hydrocarbon ua cov kuab tshuaj, kev ua haujlwm ntawm qhov kub siab tshaj qhov nplawm ntawm polypropylene, tag nrho cov polymers uas tau txais yog yaj hauv cov kuab tshuaj thiab muab faib ncaj ncees.
Cov theem ua kua polymerization: tsis muaj kuab rau hauv qhov system, propylene monomer yog polymerized nyob rau theem ua kua hauv lub hwj chim hluav taws xob.
Roj theem loj polymerization: tsis muaj kuab tshuaj tau nkag tau rau hauv qhov system, thiab propylene monomer tau polymerized nyob rau theem roj hauv cov reactor.
Catalyst hauv cov txheej txheem polymerization
Ziegler Natta catalyst yog siv dav hauv kev lag luam. Txij li nws cov tsos nyob rau xyoo 1950, nws tau ntsib los ntawm thawj tiam mus txog tiam thib plaub los ntawm kev tshawb fawb sib koom tes ntawm ntau lub teb chaws. Nws cov kev ua tiav catalytic tau ua tiav tas li, uas tau txhawb txoj kev loj hlob sai ntawm kev lag luam polypropylene.
Cov ntsiab lus dav dav Ziegler Natta catalyst hais txog kev sib xyaw ntawm pawg I mus rau III hlau alkyl sib txuas thiab pawg IV txog VIII hloov hlau cov ntsev. Txhawm rau ua kom cov catalyst ua lub luag haujlwm thiab cov duab nyob hauv cov txheej txheem polymerization, kev txhawb nqa thiab feem peb yuav raug siv.
Hlau alkyl tebchaw ua si lub luag haujlwm ntawm alkylation hauv cov txheej txheem polymerization los tsim cov tshuaj yeeb dej caw, kuj tuaj yeem tshem qhov system cuam tshuam thiab kho qhov tshuaj tiv thaiv ntawm txhua pawg. Cov khoom siv feem ntau yog alkyl aluminium sib txuas, xws li diisobutyl aluminium chloride, triisobutyl aluminium thiab trioctyl aluminium.
Txoj kev hloov cov hlau ntsev mas yog titanium, vanadium, chromium, cobalt thiab npib tsib xee. Kev siv ntau tshaj plaws yog titanium tetrachloride.
Cov khoom siv dav dav yog magnesium chloride. Cov khoom siv thib peb feem ntau yog: ethyl anisate, 2-ethylhexyl cawv thiab ethyl benzoate.
Tau qhov twg los: tus as khauj ntawm Mo Bay