Puas yog Thermoplastic Polymers Toxic?
Thermoplastic polymers yog ib hom yas uas tuaj yeem yaj thiab hloov tau ntau zaus yam tsis muaj kev hloov pauv tshuaj lom neeg tseem ceeb. Lawv tau siv dav hauv ntau yam kev lag luam, suav nrog kev ntim khoom, tsheb, kev tsim kho, thiab kev kho mob. Txawm li cas los xij, muaj kev txhawj xeeb ntau ntxiv txog qhov muaj peev xwm toxicity ntawm thermoplastic polymers thiab lawv cov kev cuam tshuam rau tib neeg kev noj qab haus huv thiab ib puag ncig.
Cov tshuaj toxicity ntawm thermoplastic polymers depends ntawm ntau yam, nrog rau lawv cov tshuaj muaj pes tsawg leeg, additives, thiab cov txheej txheem ua. Qee cov thermoplastic polymers, xws li polyvinyl chloride (PVC), muaj cov tshuaj lom neeg xws li phthalates, txhuas, thiab cadmium, uas tuaj yeem tawm ntawm cov khoom siv thiab ua paug rau ib puag ncig thiab cov saw khoom noj. PVC tseem paub tias tso tawm dioxins, ib pawg tshuaj lom neeg uas tuaj yeem ua rau mob qog noj ntshav, muaj teeb meem kev loj hlob thiab kev loj hlob, thiab kev tiv thaiv kab mob.
Lwm cov thermoplastic polymers, xws li polyethylene (PE) thiab polypropylene (PP), raug suav hais tias muaj kev nyab xeeb dua thiab muaj tshuaj lom tsawg dua PVC. Txawm li cas los xij, lawv tseem tuaj yeem muaj cov khoom ntxiv xws li stabilizers, antioxidants, thiab plasticizers, uas tuaj yeem cuam tshuam kev noj qab haus huv yog tias lawv tsiv tawm ntawm cov khoom thiab nkag mus rau hauv lub cev. Piv txwv li, qee cov plasticizers siv hauv PE thiab PP, xws li bisphenol A (BPA) thiab phthalates, tau txuas rau hormonal cuam tshuam, teeb meem kev loj hlob, thiab mob qog noj ntshav.
Lub toxicity ntawm thermoplastic polymers kuj depends ntawm lawv txoj kev ua. Qee txoj kev ua, xws li kev txhaj tshuaj molding thiab extrusion, tuaj yeem tsim cov pa phem thiab cov khoom uas tuaj yeem tsim kev puas tsuaj rau cov neeg ua haujlwm thiab ib puag ncig. Piv txwv li, kev tsim cov polycarbonate (PC), thermoplastic polymer siv hauv cov khoom siv hluav taws xob thiab kev kho mob, suav nrog kev siv bisphenol A (BPA), cov tshuaj uas tau txuas rau kev cuam tshuam hormonal thiab mob qog noj ntshav.
Txhawm rau txo qhov muaj peev xwm toxicity ntawm thermoplastic polymers, ntau yam kev cai thiab cov qauv tau tsim los txwv kev siv cov tshuaj phem thiab ua kom muaj kev nyab xeeb ntawm cov neeg ua haujlwm thiab cov neeg siv khoom. Piv txwv li, lub European Union tau txwv tsis pub siv qee yam phthalates hauv cov khoom ua si thiab cov khoom tu menyuam yaus, thiab Tebchaws Meskas tau txwv tsis pub siv cov hmoov txhuas thiab cadmium hauv cov khoom siv. Tsis tas li ntawd, qee lub tuam txhab tau tsim kev nyab xeeb rau lwm cov thermoplastic polymers, xws li biodegradable plastics ua los ntawm cov khoom siv txuas ntxiv.
Nyob rau hauv xaus, lub toxicity ntawm thermoplastic polymers depends ntawm lawv cov tshuaj muaj pes tsawg leeg, additives, thiab cov txheej txheem ua. Qee cov thermoplastic polymers, xws li PVC, muaj cov tshuaj lom neeg uas tuaj yeem tawm ntawm cov khoom siv thiab ua rau ib puag ncig thiab cov saw khoom noj. Lwm cov thermoplastic polymers, xws li PE thiab PP, suav hais tias muaj kev nyab xeeb dua tab sis tseem yuav muaj cov khoom ntxiv uas tuaj yeem muaj kev cuam tshuam kev noj qab haus huv. Txhawm rau kom muaj kev nyab xeeb ntawm cov neeg ua haujlwm thiab cov neeg siv khoom, ntau cov kev cai thiab cov qauv tau tsim los txwv tsis pub siv cov tshuaj phem thiab txhawb kev siv lwm txoj kev nyab xeeb.