I-PVC yake yaba yipulasitiki enkulu kunazo zonke emhlabeni ekukhiqizeni futhi isetshenziswa kabanzi. Isetshenziswa kabanzi ezintweni zokwakha, imikhiqizo yezimboni, izidingo zansuku zonke, isikhumba saphansi, amathayela aphansi, isikhumba sokwenziwa, amapayipi, izintambo nezintambo, amafilimu okupakisha, amabhodlela, izinto ezigwebu, izinto zokuvala, imicu neminye imikhakha.
Kodwa-ke, ngo-Okthoba 27, 2017, uhlu lwe-carcinogen olushicilelwe yi-International Agency for Research on Cancer ye-World Health Organization (WHO) lwahlanganiswa futhi lwaboniswa, futhi i-PVC yafakwa ohlwini lwe-Class 3 carcinogen.I-Vinyl chloride, njengento eluhlaza yokuhlanganiswa kwe-PVC, ifakwe ohlwini lwe-Class I carcinogen.
01 Imithombo yezinto ze-vinyl chloride emikhiqizweni yezicathulo
I-vinyl chloride, eyaziwa nangokuthi i-vinyl chloride, iyinhlanganisela ye-organic ene-chemical formula C2H3Cl. Kuyi-monomer ebalulekile kumakhemikhali e-polymer futhi ingatholakala ku-ethylene noma i-acetylene. Isetshenziswa kakhulu ukwenza ama-homopolymers nama-copolymers we-polyvinyl chloride. Ingaphinde yenziwe i-copolymerized nge-vinyl acetate, i-butadiene, njll., futhi ingabaisetshenziswa njenge-extractant yamadayi nezinongo.Ingasetshenziswa futhi njenge-comonomer yama-polymer ahlukahlukene. Nakuba i-vinyl chloride iyimpahla ebalulekile ebalulekile embonini yepulasitiki, ingasetshenziswa futhi njengesiqandisi, njll. Ingasetshenziswa futhi njengento yokukhipha odayi nezinongo. Ekukhiqizweni kwemikhiqizo yezicathulo nezingubo, i-vinyl chloride isetshenziselwa ukukhiqiza i-polyvinyl chloride (PVC) nama-vinyl polymers, okungaba izinto eziqinile noma eziguquguqukayo. Ukusetshenziswa okungase kube khona kwe-PVC kufaka phakathi ukuphrinta kwesikrini sepulasitiki, izingxenye zepulasitiki, nezingubo ezihlukahlukene zesikhumba, isikhumba sokwenziwa, nezindwangu.
I-vinyl chloride monomer eyinsalela ezintweni ezihlanganiswe kusuka ku-vinyl chloride ingakhishwa kancane kancane kokubalulekile, okunomthelela empilweni yabathengi kanye nendawo ezungezile.
02 Izingozi zezinto ze-vinyl chloride
I-vinyl chloride ingabamba iqhaza ekuphenduleni kwentuthu ye-photochemical endaweni, kodwa ngenxa yokuguquguquka kwayo okuqinile, ijwayele ukuthwebula izithombe emkhathini. I-vinyl chloride monomer ibeka ubungozi obuhlukahlukene kubasebenzi nakubathengi, kuye ngohlobo lwe-monomer kanye nendlela yokuchayeka. I-Chloroethylene igesi engenambala emazingeni okushisa asekamelweni, enobumnandi obuncane cishe obungama-3000 ppm. Ukuchayeka okubukhali (isikhashana) ekugxilweni okuphezulu kwe-vinyl chloride emoyeni kungaba nomthelela ohlelweni lwezinzwa olumaphakathi (CNS),njengesiyezi, ukozela, nobuhlungu bekhanda. Ukuhogela umoya isikhathi eside kanye nokuchayeka ku-vinyl chloride kungase kubangele umdlavuza wesibindi.
Njengamanje, izimakethe zaseYurophu nezaseMelika zigxile ekusetshenzisweni kwe-vinyl chloride monomers ezintweni ze-PVC nezinto zazo, futhi zisebenzisa izilawuli zomthetho. Iningi lemikhiqizo yamazwe ngamazwe eyaziwa kakhulu idinga ukuthi izinto ze-PVC zivinjelwe emikhiqizweni yazo yabathengi. Uma i-PVC noma izinto eziqukethe i-PVC zidingekile ngenxa yezizathu zobuchwepheshe, okuqukethwe kwe-vinyl chloride monomers ezintweni kumele kulawulwe. I-International RSL Management Working Group for Clothing and Footwear AFIRM, Edition 7th 2022, idinga ukuthiokuqukethwe kwe-VCM ezintweni akumele kudlule i-1ppm.
Abakhiqizi namabhizinisi kufanele baqinise ukulawulwa kwe-supply chain,ngokugxila ngokukhethekile nasekulawuleni okuqukethwe kwama-vinyl chloride monomers ezintweni ze-PVC, ukuphrinta isikrini sepulasitiki, izingxenye zepulasitiki, nezingubo ezihlukahlukene ze-PVC esikhumbeni, isikhumba sokwenziwa, nezindwangu.. Ngesikhathi esifanayo, kuyadingeka futhi ukunaka ukuthuthukiswa kwezinqubo zokukhiqiza, ukuthuthukisa uhlelo lokuphatha ikhwalithi, futhi kuthuthukiswe izinga lokuphepha komkhiqizo kanye nekhwalithi ukuze uhambisane nezidingo zokulawula ezifanele.
Isikhathi sokuthumela: Apr-14-2023