Kodi Thermoplastic Polymers Ndi Yowopsa?
Ma polima a thermoplastic ndi mtundu wa pulasitiki womwe ungasungunuke ndikusinthidwa kangapo popanda kusintha kwakukulu kwa mankhwala. Amagwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana, kuphatikizapo kulongedza, magalimoto, zomangamanga, ndi zamankhwala. Komabe, pali nkhawa yowonjezereka yokhudza poizoni womwe ungachitike chifukwa cha ma polima a thermoplastic komanso momwe amakhudzira thanzi la anthu komanso chilengedwe.
Kuopsa kwa ma polima a thermoplastic kumadalira pazifukwa zingapo, kuphatikiza kapangidwe kake ka mankhwala, zowonjezera, ndi njira zopangira. Ma polima ena a thermoplastic, monga polyvinyl chloride (PVC), imakhala ndi mankhwala oopsa monga phthalates, lead, ndi cadmium, omwe amatha kutuluka m'zinthuzo ndikuwononga chilengedwe ndi chakudya. PVC amadziwikanso kuti amamasula ma dioxin, gulu la poizoni kwambiri la mankhwala omwe angayambitse khansa, mavuto a ubereki ndi chitukuko, ndi kuwonongeka kwa chitetezo cha mthupi.
Ma polima ena a thermoplastic, monga polyethylene (PE) ndi polypropylene (PP), amaonedwa kuti ndi otetezeka komanso opanda poizoni kuposa PVC. Komabe, atha kukhalabe ndi zowonjezera monga zolimbitsa thupi, ma antioxidants, ndi mapulasitiki, omwe amatha kukhala ndi zotsatira zoyipa zaumoyo ngati atasamuka ndikulowa m'thupi. Mwachitsanzo, mapulasitiki ena omwe amagwiritsidwa ntchito mu PE ndi PP, monga bisphenol A (BPA) ndi phthalates, akhala akugwirizana ndi kusokonezeka kwa mahomoni, mavuto a chitukuko, ndi khansa.
Kuopsa kwa ma polima a thermoplastic kumadaliranso njira zawo zopangira. Njira zina zogwirira ntchito, monga kuumba jekeseni ndi kutulutsa, zimatha kupanga utsi wapoizoni ndi tinthu ting'onoting'ono tomwe titha kuwononga antchito ndi chilengedwe. Mwachitsanzo, kupanga polycarbonate (PC), polima ya thermoplastic yomwe imagwiritsidwa ntchito pamagetsi ndi zida zamankhwala, imaphatikizapo kugwiritsa ntchito bisphenol A (BPA), mankhwala omwe amagwirizana ndi kusokonezeka kwa mahomoni ndi khansa.
Pofuna kuchepetsa kuopsa kwa ma polima a thermoplastic, malamulo ndi miyezo yosiyanasiyana yapangidwa kuti achepetse kugwiritsa ntchito mankhwala owopsa ndikuwonetsetsa chitetezo cha ogwira ntchito ndi ogula. Mwachitsanzo, bungwe la European Union laletsa kugwiritsa ntchito ma phthalates m’zoseŵeretsa ndi zosamalira ana, ndipo United States yaletsa kugwiritsira ntchito mtovu ndi cadmium m’zinthu zogula. Kuphatikiza apo, makampani ena apanga njira zina zotetezeka m'malo mwa ma polima achikhalidwe a thermoplastic, monga mapulasitiki owonongeka opangidwa kuchokera kuzinthu zongowonjezedwanso.
Pomaliza, kawopsedwe ka ma polima a thermoplastic kumadalira momwe amapangira mankhwala, zowonjezera, ndi njira zopangira. Ma polima ena a thermoplastic, monga PVC, ali ndi mankhwala oopsa omwe amatha kutuluka m'zinthuzo ndikuwononga chilengedwe ndi chakudya. Ma polima ena a thermoplastic, monga PE ndi PP, amawonedwa ngati otetezeka koma amatha kukhala ndi zowonjezera zomwe zitha kukhala ndi zotsatira zoyipa zaumoyo. Kuonetsetsa chitetezo cha ogwira ntchito ndi ogula, malamulo ndi miyezo yosiyanasiyana yapangidwa kuti achepetse kugwiritsa ntchito mankhwala owopsa ndikulimbikitsa kugwiritsa ntchito njira zina zotetezeka.
