Yam Khoom Uas Yog Dab Tsi Uas Ua Rau Lub Ntiaj Teb No?

Tam sim no, PVC yog dav siv ua raw khoom rau cov khoom siv khomob pov tseg tom tsev thiab sia mus thoob ntiajteb. Cov khoom muaj qhov zoo ntawm kev ua kom tiav lub cev thiab cov khoom siv dag zog, tsis tshua muaj nqi thiab yooj yim ntau lawm. Txawm li cas los xij, kev siv cov cuab yeej siv hauv PVC uas yog siv cov khoom siv khomob muaj kev cuam tshuam li no:

1. Tus nqi tsawg tsawg ntawm polyethylene monomer yuav nyob twj ywm hauv PVC, uas tau raug pov thawj los ua carcinogenic; cov khoom yas uas yuav tsum tau siv rau lub sijhawm ua haujlwm yuav maj mam mus mus rau cov dej ua paug; muab ntau hom hlau uas muaj hlau sib xyaw ua rau stabilizers yuav tsim kev puas tsuaj rau tib neeg; txhawm rau txhim kho kom ruaj ntseg ntawm cov hlau stabilizers, qhov ntxiv ntawm phosphorus-muaj adjuvants yuav ntxiv zuj zus ntxiv. Cov tshuaj qoob loo ntawm PVC cov ntaub ntawv thiab cov teeb meem pov tseg ntawm cov pov tseg PVC yuav ua rau muaj pa phem rau cheeb tsam.

2. Vim tias muaj cov teeb meem saum toj no hauv PVC cov ntaub ntawv, qee lub tebchaws uas tsim hauv Tebchaws Asmeskas, Nyij Pooj Teb chaws thiab Tebchaws Europe tau tsim cov khoom siv rau PVC. Kom deb li deb, PVC tseem dominates cov cuab yeej siv tshuaj kho mob tom qab vim tsis muaj lwm cov ntaub ntawv uas yuav lwv nrog PVC hauv kev kawm ntawv thiab cov nqi.

Cov khoom kho mob xws li cov phom uas siv tas pov tseg raws li cov qauv ntawm cov khoom siv kho mob tau raug tshuaj tua kab mob thiab ua kom tsis muaj zog ua ntej thiab thaum lub hnab ntim khoom, uas hais tau tias yuav tsis huv. Yog li, nws tsis tas yuav rov tua cov dej tshuaj thaum lawv tau siv los yog siv. Txwv tsis pub, lawv yuav raug kuab vim hais tias "kev tswj tus kheej" yog tsis nruj thiab kev lag luam. Cov lus rov qab yog qhov tseeb.

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