qhia:
PVC (polyvinyl chloride) yog ib hom thermoplastic polymer siv rau kev lag luam thiab hauv tsev. Lead, cov hlau hnyav hnyav, tau siv rau hauv cov xov paj PVC rau ntau xyoo, tab sis nws cov teebmeem tsis zoo rau tib neeg kev noj qab haus huv thiab ib puag ncig tau ua rau kev txhim kho PVC lwm txoj hauv kev. Hauv tsab xov xwm no, peb yuav tham txog qhov sib txawv ntawm PVC thiab PVC tsis muaj hlau lead.
Dab tsi yog Lead-Free PVC?
PVC tsis muaj txhuas yog ib hom PVC uas tsis muaj txhuas. Vim tias tsis muaj cov hmoov txhuas, cov hmoov lead-dawb PVC muaj kev nyab xeeb thiab zoo ib puag ncig zoo dua li cov khoom siv PVC. PVC tsis muaj txhuas feem ntau yog ua los ntawm calcium, zinc lossis tin stabilizers es tsis txhob siv lead ua stabilizers. Cov stabilizers muaj cov khoom zoo ib yam li cov hlau lead stabilizers, tab sis tsis muaj kev cuam tshuam rau kev noj qab haus huv thiab ib puag ncig.
Qhov sib txawv ntawm PVC thiab PVC tsis muaj hlau lead
1. Toxicity
Qhov sib txawv tseem ceeb ntawm PVC thiab PVC tsis muaj txhuas yog qhov muaj lossis tsis muaj txhuas. Cov khoom siv PVC feem ntau muaj cov hlau lead stabilizers uas tuaj yeem tawm ntawm cov khoom thiab ua rau muaj kev puas tsuaj ib puag ncig. Cov hmoov txhuas yog cov hlau hnyav hnyav uas tuaj yeem ua rau muaj teeb meem hauv lub paj hlwb thiab kev loj hlob, tshwj xeeb tshaj yog rau cov menyuam yaus. Lead-free PVC tshem tawm txoj kev pheej hmoo ntawm kev tsim cov hlau lead.
2. Kev cuam tshuam ib puag ncig
PVC tsis yog biodegradable thiab tuaj yeem nyob hauv ib puag ncig rau ntau pua xyoo. Thaum incinerated los yog pov tseg tsis raug, PVC tuaj yeem tso cov tshuaj lom rau hauv huab cua thiab dej. PVC tsis muaj hlau lead yog ntau tus phooj ywg ib puag ncig vim nws tsis muaj txhuas thiab tuaj yeem siv dua.
3. Yam ntxwv
PVC thiab PVC tsis muaj hlau lead muaj cov khoom zoo sib xws, tab sis muaj qee qhov sib txawv. Cov hlau lead stabilizers tuaj yeem txhim kho PVC cov khoom xws li thermal stability, weatherability thiab processability. Txawm li cas los xij, PVC tsis muaj hlau lead tuaj yeem ua tiav cov khoom zoo sib xws los ntawm kev siv cov khoom stabilizers ntxiv xws li calcium, zinc thiab tin.
4. Tus nqi
PVC tsis muaj txhuas yuav raug nqi ntau dua li cov pa PVC vim yog siv cov khoom ruaj khov ntxiv. Txawm li cas los xij, tus nqi sib txawv tsis yog qhov tseem ceeb thiab cov txiaj ntsig ntawm kev siv cov hmoov lead-dawb PVC ntau dua cov nqi.
Post lub sij hawm: Dec-31-2024