Na Thermoplastic Polymers e na le Chefo?
Thermoplastic polymers ke mofuta oa polasetiki o ka qhibilihang le ho bōptjoa bocha ka makhetlo a mangata ntle le hore ho be le liphetoho tsa bohlokoa tsa lik'hemik'hale. Li sebelisoa haholo liindastering tse fapaneng, ho kenyelletsa ho paka, likoloi, tsa kaho le tsa bongaka. Leha ho le joalo, ho na le ngongoreho e ntseng e hola mabapi le chefo e ka bang teng ea li-polymer tsa thermoplastic le phello ea tsona bophelong ba batho le tikolohong.
Chefo ea lipolima tsa thermoplastic depee fana ka lintlha tse 'maloa, ho kenyelletsa le metsoako ea tsona ea lik'hemik'hale, li-additives le mekhoa ea ho e lokisa. Li-polymer tse ling tsa thermoplastic, joalo ka polyvinyl chloride (PVC), li na le lik'hemik'hale tse chefo tse kang phthalates, lead, le cadmium, e ka tswelang kantle ho thepa mme ya silafatsa tikoloho le ketane ya dijo. PVC e boetse e tsejoa ka ho lokolla dioxin, sehlopha sa lik'hemik'hale tse chefo haholo tse ka bakang mofetše, mathata a ho ba le bana le khōlo, le tšenyo ea sesole sa 'mele.
Li-polymer tse ling tsa thermoplastic, joalo ka polyethylene (PE) 'me polypropylene (PP), li nkoa li bolokehile ebile li le chefo ho feta PVC. Leha ho le joalo, li ka 'na tsa e-na le li-additives tse kang stabilizers, antioxidants le plasticizers, tse ka bang le liphello tse mpe tsa bophelo bo botle haeba li falla ka ntle ho thepa' me li kena 'meleng. Ka mohlala, li-plasticizers tse ling tse sebelisoang ho PE le PP, tse kang bisphenol A (BPA) le phthalates, li 'nile tsa amahanngoa le ho senyeha ha li-hormone, mathata a tsoelo-pele le kankere.
Chefo ea lipolymer tsa thermoplastic le tsona depee itšetlehile ka mekhoa ea bona ea ho sebetsa. Mekhoa e meng ea ho e lokisa, e kang ho etsa ente le extrusion, e ka hlahisa mosi o chefo le likaroloana tse ka bang kotsi ho basebetsi le tikolohong. Ka mohlala, tlhahiso ea polycarbonate (PC), polymer ea thermoplastic e sebelisoang lisebelisoa tsa elektronike le lisebelisoa tsa bongaka, e kenyelletsa tšebeliso ea bisphenol A (BPA), k'hemik'hale e 'nileng ea amahanngoa le ho senyeha ha li-hormone le kankere.
Ho fokotsa chefo e ka bang teng ea li-polymers tsa thermoplastic, ho entsoe melaoana le litekanyetso tse fapaneng ho fokotsa ts'ebeliso ea lik'hemik'hale tse kotsi le ho netefatsa polokeho ea basebetsi le bareki. Ka mohlala, the Europenan Union e thibetse tšebeliso ea li-phthalates tse itseng linthong tsa ho bapala le lihlahisoa tsa tlhokomelo ea bana, 'me United States e thibetse tšebeliso ea loto le lihlahisoa tsa tlhokomelo ea bana. cadmium lihlahisoa tsa bareki. Ho feta moo, lik'hamphani tse ling li thehile mekhoa e meng e sireletsehileng ho feta ea li-polymers tsa setso tsa thermoplastic, joalo ka lipolasetiki tse senyehang habonolo tse entsoeng ka lisebelisoa tse ka nchafatsoang.
Qetellong, chefo ea lipolima tsa thermoplastic depeli fumaneha ka metsoako ea bona ea lik'hemik'hale, li-additives le mekhoa ea ho e lokisa. Li-polymer tse ling tsa thermoplastic, joalo ka PVC, li na le lik'hemik'hale tse chefo tse ka tsoang 'me tsa silafatsa tikoloho le ketane ea lijo. Li-polymer tse ling tsa thermoplastic, joalo ka PE le PP, li nkuoa li bolokehile empa li ntse li ka ba le litlatsetso tse ka bang le litlamorao tse mpe tsa bophelo bo botle. Ho netefatsa polokeho ea basebetsi le bareki, ho entsoe melawana le maemo a fapaneng ho fokotsa tšebeliso ea lik'hemik'hale tse kotsi le ho khothaletsa tšebeliso ea mekhoa e meng e sireletsehileng.