"PVC yog ib qho kev sib ntaus sib tua ntawm cov yas muaj tshuaj lom. Los ntawm kev tsim khoom, kev siv, mus txog qhov kawg pov tseg, nws ua rau muaj kev phom sij rau ib puag ncig thiab tib neeg kev noj qab haus huv." Stabilizers uas yuav tsum tau ntxiv thaum PVC yog synthesized rau hauv ntau yam khoom (xws li lead, cadmium) thiab plasticizers (phthalates, xws li DEHP).

Raws li cov hydrochloric acid thiab cov tshuaj lom dioxin ntawm lub xyoo pua tsim los ntawm combustion tom qab pov tseg, tag nrho cov ntawm lawv yog cov teeb meem ntawm lub hauv paus chiv keeb.

Jia Mingxing, tus lwm thawj coj thiab tus tuav ntaub ntawv ntawm Tuam Tshoj Nonferrous Metals Industry Association, tau hais tias, "Kuv lub teb chaws cov khoom tsim tawm txhua xyoo ntawm kaum lab tons ntawm PVC yog sib cais los ntawm mercury catalysts."

Vim tias tsis muaj peev txheej roj av hauv kuv lub tebchaws, feem ntau PVC yog tsim los ntawm txoj kev calcium carbide. Cov mercury catalyst nyob rau hauv cov txheej txheem calcium carbide vinyl chloride ntau lawm yog lub ntsiab ntawm mercury muaj kuab paug, thiab nws ntws mus rau hauv ib puag ncig nyob rau hauv ntau txoj kev [2].

Raws li kev txheeb cais, Tuam Tshoj siv 20 feem pua ​​​​ntawm lub ntiaj teb mercury, ntawm 60 feem pua ​​​​yog siv rau calcium carbide PVC ntau lawm. [4]

Ntawm qhov tod tes, kev tsim khoom ntawm PVC yog kev lag luam siab zog thiab muaj ntau yam tshuaj lom, xws li dichloroethane, vinyl chloride, mercury pollution, thiab lwm yam. Thaum muaj kev tawg lossis tawg, nws yuav ua rau muaj kev phom sij rau kev noj qab haus huv. cov neeg ua haujlwm hauv cov nroj tsuag vinyl chloride thiab cov neeg nyob ze. Kev hem thawj loj.

PVC siv --- Kev phom sij rau kev noj qab haus huv

Nyob rau hauv cov txheej txheem ntawm PVC ntau lawm thiab ua, ib co kev pab yuav tsum tau ntxiv, xws li muab tub lim, stabilizers, lubricants, plasticizers, colorants thiab nplaim retardants. Ntawm lawv, stabilizers thiab plasticizers yog siv nyob rau hauv ntau npaum li cas. [5]

Ua ntej PVC yuav ua rau ntau yam khoom tiav, cov ntsiab lus sib txawv ntawm cov yas yuav tsum tau ntxiv raws li qhov xav tau ntawm cov khoom muag. Feem ntau hais lus, semi-rigid PVC yuav tsum tau ntxiv 10-30 feem pua ​​plasticizer, thiab mos PVC yuav tsum tau ntxiv 30-70 feem pua ​​plasticizer.

Piv txwv li, cov ntsiab lus nruab nrab ntawm cov yas yas hauv cov khoom siv kho mob yog 20 feem pua ​​-40 feem pua. Yog tias nws zoo li lub hnab yas, lub raj xa dej los yog lub hnab ntim dej, thiab lwm yam, cov ntsiab lus yas tuaj yeem ncav cuag ntau dua 70 feem pua, uas yog sib npaug rau PVC rau hauv cov yas yas.

Muaj ntau ntau hom PVC plasticizers, tab sis feem ntau yog ib chav kawm ntawm cov tshuaj hu ua phthalates.

"Phthalates thiab lawv cov metabolites thiab degradation cov khoom muaj kev cuam tshuam tsis zoo rau tib neeg kev noj qab haus huv, xws li endocrine cuam tshuam, feminization ntawm cov tub, thiab precocious puberty rau cov ntxhais."

Ntawm qhov tod tes, vim tias PVC tsis tiv taus lub teeb thiab kub, nyob rau hauv kev cuam tshuam ntawm lub teeb thiab cua sov, cov dawb radicals ntawm chlorine yuav raug tso tawm, ua rau cov khoom tsis zoo. Txhawm rau txhim kho cov thermal stability ntawm PVC, qhov tsim nyog tus nqi ntawm stabilizer feem ntau ntxiv los tiv thaiv lossis ua kom qeeb ntawm PVC thaum lub sijhawm ua haujlwm.

Cov pa phem uas tshwm sim los ntawm cov stabilizers yog cov hlau hnyav hnyav.

Feem ntau siv cov stabilizers xws li txhuas, cadmium, zinc, barium, tin thiab lwm yam hlau ntsev, cov hlau no yuav nkag mus ntawm PVC cov khoom, yog li ua rau tib neeg kev noj qab haus huv.

"Cov tshuaj stabilizer uas nquag siv tuaj yeem ua rau lub paj hlwb ntawm cov menyuam yaus puas tsuaj thiab cuam tshuam lawv txoj kev loj hlob IQ; nws tuaj yeem ua rau cov poj niam cev xeeb tub thiab ua rau mob qog noj ntshav. Cadmium tuaj yeem cuam tshuam rau lub raum kev ua haujlwm.

Kev xav: Lub nra nce lub nra, txhais tes xav tias nplaum, muaj cov yas los yog khaus khaus, nws yooj yim kom qias neeg thiab yooj yim los ntxuav.

Lifespan: luv luv lifespan, qee lub hnab me me, ib zaug lifespan, xws li pvc lub xov tooj ntawm tes waterproof hnab, seams twb me ntsis tawg tom qab rub tawm, thiab muaj kev pheej hmoo loj thaum siv lawv dua; cov hnab loj, xws li pvc pob zeb nce toj hnab, hnab roob roob, lub xub pwg waterproofing Backpacks, tsheb kauj vab packs tau zoo nkauj heev torn ntawm seams rau ib xyoos los yog li ntawd, ntau los yog tsawg. Qhov rov qab tsim kua muag ntawm pvc ntaub yog yooj yim tshwm sim, feem ntau vim nws tsis txaus viscosity thiab elasticity. Cov cuab yeej ntawm lub cev no ua rau nws tsis muaj zog ntau dua li tpu waterproof ntaub.