PVC yog ib zaug lub ntiaj teb loj tshaj plaws-lub hom phiaj yas hauv kev tsim khoom thiab siv dav. Nws yog dav siv hauv cov khoom siv hauv tsev, cov khoom lag luam, cov khoom siv niaj hnub, cov tawv tawv hauv pem teb, cov vuas hauv pem teb, tawv tawv, cov kav dej, cov xov hlau thiab cables, ntim cov yeeb yaj kiab, lub raj mis, cov ntaub ntawv foaming, sealing cov ntaub ntawv, fibers, thiab lwm yam.
Txawm li cas los xij, thaum Lub Kaum Hli 27, 2017, cov npe ntawm cov kab mob carcinogen luam tawm los ntawm Lub Chaw Haujlwm Saib Xyuas Kev Tshawb Fawb Thoob Ntiaj Teb rau Kev Kho Mob ntawm Lub Koom Haum Ntiaj Teb Kev Noj Qab Haus Huv (WHO) tau sau ua ntej thiab xa mus, thiab PVC tau suav nrog hauv cov npe ntawm Class 3 carcinogen.Vinyl chloride, raws li cov khoom siv raw rau PVC synthesis, tau teev nyob rau hauv cov npe ntawm Class I carcinogen.
01 Qhov chaw ntawm cov tshuaj vinyl chloride hauv cov khoom khau
Vinyl chloride, tseem hu ua vinyl chloride, yog cov organic compound nrog cov tshuaj formula C2H3Cl. Nws yog ib qho tseem ceeb monomer hauv polymer chemistry thiab tuaj yeem tau los ntawm ethylene lossis acetylene. Nws yog tsuas yog siv los tsim homopolymers thiab copolymer ntawm polyvinyl chloride. Nws tuaj yeem ua tau copolymerized nrog vinyl acetate, butadiene, thiab lwm yam.siv los ua ib qho extractant rau dyes thiab txuj lom.Nws kuj tseem siv tau los ua comonomer rau ntau yam polymers. Txawm hais tias vinyl chloride yog cov khoom siv tseem ceeb hauv kev lag luam yas, nws tseem tuaj yeem siv los ua cov tub yees, thiab lwm yam. Nws kuj tseem siv tau los ua cov extractant rau dyes thiab txuj lom. Hauv kev tsim cov khoom siv khau thiab khaub ncaws, vinyl chloride yog siv los tsim polyvinyl chloride (PVC) thiab vinyl polymers, uas tuaj yeem ua cov ntaub ntawv nyuaj lossis hloov tau. Muaj peev xwm siv PVC muaj xws li yas tshuaj ntsuam luam ntawv, cov khoom yas, thiab ntau yam txheej ntawm tawv, hluavtaws tawv, thiab textiles.
Cov residual vinyl chloride monomer nyob rau hauv cov khoom tsim los ntawm vinyl chloride tuaj yeem maj mam tso rau hauv cov khoom, uas muaj kev cuam tshuam rau cov neeg siv khoom noj qab haus huv thiab ib puag ncig ecological.
02 Kev phom sij ntawm cov tshuaj vinyl chloride
Vinyl chloride tuaj yeem koom nrog cov tshuaj tiv thaiv photochemical smog hauv ib puag ncig, tab sis vim nws qhov tsis muaj zog, nws muaj peev xwm ua rau photolysis hauv huab cua. Vinyl chloride monomer ua rau muaj kev phom sij ntau rau cov neeg ua haujlwm thiab cov neeg siv khoom, nyob ntawm seb hom monomer thiab raug rau txoj hauv kev. Chloroethylene yog cov roj tsis muaj xim nyob rau hauv chav tsev kub, nrog me ntsis qab zib ntawm ib ncig ntawm 3000 ppm. Mob (lub sij hawm luv luv) raug rau siab concentration ntawm vinyl chloride nyob rau hauv cov huab cua tuaj yeem cuam tshuam rau hauv nruab nrab paj hlwb (CNS),xws li kiv taub hau, tsaug zog, thiab mob taub hau. Kev nqus tau mus ntev thiab raug vinyl chloride tuaj yeem ua rau mob qog noj ntshav.
Tam sim no, European thiab Asmeskas kev lag luam tau tsom mus rau kev siv cov yas chloride monomers hauv PVC cov ntaub ntawv thiab lawv cov ntaub ntawv, thiab tau siv txoj cai tswjfwm. Feem ntau cov npe nrov thoob ntiaj teb xav kom cov ntaub ntawv PVC raug txwv hauv lawv cov khoom siv. Yog tias PVC lossis cov ntaub ntawv uas muaj PVC yog qhov tsim nyog vim yog vim li cas thev naus laus zis, cov ntsiab lus ntawm vinyl chloride monomers hauv cov ntaub ntawv yuav tsum raug tswj. International RSL Management Working Group rau khaub ncaws thiab khau AFIRM, 7th Edition 2022, xav komVCM cov ntsiab lus hauv cov ntaub ntawv yuav tsum tsis pub tshaj 1ppm.
Cov neeg tsim khoom thiab cov lag luam yuav tsum ntxiv dag zog rau kev tswj cov saw hlau,nrog rau kev tsom mus rau thiab tswj cov ntsiab lus ntawm cov yas chloride monomers hauv cov ntaub ntawv PVC, yas tshuaj ntsuam luam ntawv, cov khoom siv yas, thiab ntau yam PVC coatings ntawm tawv, hluavtaws tawv, thiab textiles.. Nyob rau tib lub sijhawm, nws tseem yuav tsum tau ua tib zoo saib xyuas kev ua kom zoo ntawm cov txheej txheem ntau lawm, txhim kho cov kev tswj xyuas kom zoo, thiab ntxiv txhim kho qib ntawm cov khoom lag luam kev nyab xeeb thiab kev ua tau zoo kom ua tau raws li cov kev cai tswj xyuas.
Post lub sij hawm: Apr-14-2023