Cov yas yog cov khoom siv tsis tseem ceeb hauv lub neej niaj hnub thiab kev tsim khoom lag luam, thiab kev nyab xeeb ntawm bisphenol A (BPA) ib txwm yog qhov tseem ceeb ntawm pej xeem kev txhawj xeeb. Ntawm cov lus nug uas nquag nug yog seb ABS yas puas muaj BPA. Tsab ntawv xov xwm no yuav muab cov ncauj lus qhia ntxaws ntxaws txog cov yam ntxwv ntawm ABS yas los ntawm kev tshawb fawb pom, qhia meej txog nws txoj kev sib raug zoo nrog BPA, thiab ua tib zoo sau cov pawg ntawm cov yas uas muaj thiab tsis muaj BPA, pab cov neeg nyeem tsim kev nkag siab txog kev nkag siab ntawm cov yas thiab tsis txhob muaj kev pheej hmoo rau kev noj qab haus huv.
I. ABS Yas: Kev Ntsuas Cov Khoom thiab Cov Khoom Siv
ABS yas, luv luv rau acrylonitrile-butadiene-styrene copolymer, yog ib qho dav -lub hom phiaj engineering yas synthesized los ntawm cov tshuaj tiv thaiv copolymerization ntawm peb monomers: acrylonitrile (A), butadiene (B), thiab styrene (S). Nws cov yam ntxwv tseem ceeb yog tias nws muab cov txiaj ntsig zoo ntawm tag nrho peb cov monomers: acrylonitrile muab kev ua haujlwm zoo, roj tsis kam, thiab tshuaj tiv thaiv corrosion; butadiene txhim khu nws toughness thiab cuam tshuam tsis kam; thiab styrene muab nws zoo heev processability thiab nto gloss.
Los ntawm kev xav txog kev sib xyaw, cov khoom siv raw rau ABS yas tsim tsuas yog peb lub monomers tau hais tseg, ** thiab ** nws tsis siv bisphenol A (BPA) ua raw khoom **, uas yog qhov laj thawj tseem ceeb vim li cas nws tsis muaj BPA. Raws li cov khoom no, ABS yas yog siv dav hauv cov khoom vaj khoom tsev, cov khoom siv hluav taws xob, cov khoom siv hauv tsheb, cov menyuam yaus cov khoom ua si, lub nra, thiab cov khoom siv hauv chav dej, ua rau nws yog ib qho ntawm cov khoom siv dav siv siab tshaj -kev ua tau zoo - cov khoom siv yas.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias qee qhov tshwj xeeb - lub hom phiaj ABS yas (xws li nplaim taws- retardant ABS) yuav muaj tetrabromobisphenol A (TBBPA) ua cov nplaim hluav taws. TPBPA yog ib tug derivative ntawm BPA thiab txawv nyob rau hauv cov khoom ntawm BPA siv raws li ib tug monomer nyob rau hauv yas synthesis. Nws txoj kev tsiv teb tsaws chaw yog tsawg heev thiab nws ua tau raws li lub teb chaws ib puag ncig thiab kev nyab xeeb cov qauv. ABS yas siv rau hauv kev sib cuag cov khoom noj thiab cov khoom siv me nyuam yaus yog tsim los ntawm halogen-cov nplaim hluav taws tsis muaj hluav taws xob thiab tsis muaj cov phom sij bisphenol A, ua rau lawv muaj kev nyab xeeb siv.
II. Kev nkag siab yooj yim ntawm Bisphenol A: Hazards thiab tshwm sim Scenarios
Bisphenol A (BPA) yog cov khoom siv hluavtaws feem ntau siv los ua cov monomer hauv kev tsim cov yas thiab cov resins, nthuav tawm cov cua sov zoo thiab ruaj khov. Txawm li cas los xij, kev tshawb fawb tau pom tias BPA yog qhov cuam tshuam endocrine; nyob rau hauv qhov kub thiab txias, acidic, los yog alkaline tej yam kev mob, nws yuav tsiv los ntawm plastics. Ntev -ntev ntev tuaj yeem cuam tshuam rau tib neeg cov kab mob endocrine, uas cuam tshuam rau kev loj hlob ntawm tus menyuam mos thiab cov neeg laus cov metabolism.
Tam sim no, kuv lub teb chaws thiab ntau lub teb chaws thoob ntiaj teb tau txwv tsis pub siv BPA - muaj cov ntaub ntawv hauv cov khoom me nyuam mos (xws li lub raj mis me me thiab cov pacifiers), thiab cov qauv nruj tau tsim los rau BPA tsiv teb tsaws theem hauv cov khoom noj khoom haus tiv thaiv tib neeg kev noj qab haus huv. Yog li ntawd, kom paub qhov txawv ntawm BPA-muaj thiab BPA- cov yas dawb yog qhov tseem ceeb rau kev xaiv cov khoom siv niaj hnub thiab kev tiv thaiv kev noj qab haus huv.
III. Cov Khoom Siv Yas Feem Ntau Muaj Bisphenol A
Bisphenol A txoj kev siv tseem ceeb yog ib qho monomer hauv cov yas synthesis; Yog li ntawd, nws yog feem ntau pom nyob rau hauv plastics thiab resins ua los ntawm nws. Cov hom muaj xws li:
1. Polycarbonate (PC): Cov feem ntau raug bisphenol A- muaj cov yas, polymerized los ntawm bisphenol A thiab diphenyl carbonate. Nws yog tus cwj pwm los ntawm pob tshab, cuam tshuam tsis kam, thiab ua kom sov zoo, thiab tau siv dav hauv khob dej, lub raj mis me nyuam, thoob, CDs, thiab cov khoom siv hluav taws xob. Txawm li cas los xij, vim qhov yooj yim tso tawm ntawm bisphenol A ntawm qhov kub thiab txias, nws tau maj mam hloov hauv daim ntawv thov kev sib cuag zaub mov (tshwj xeeb tshaj yog rau cov khoom me nyuam mos).
2. Epoxy resin: Synthesized feem ntau los ntawm bisphenol A thiab epichlorohydrin, nws muaj zoo adhesion, rwb thaiv tsev, thiab corrosion kuj. Nws yog dav siv nyob rau hauv coatings rau sab hauv phab ntsa ntawm cov kaus poom hlau (kom tiv thaiv tau corrosion), hluav taws xob potting tebchaw, coatings, thiab Circuit Court board substrates. Muaj qhov ua tau ntawm kab mob bisphenol A tsiv teb tsaws.
3. Qee qhov siab -kev ua tau zoo engineering plastics: xws li polysulfone, polyarylate, thiab ib nrab hloov polyphenylene ether, cov ntaub ntawv no siv bisphenol A raws li cov khoom siv hluavtaws monomer thiab muaj cov khoom xws li kub tsis kam thiab kub siab ua haujlwm. Lawv feem ntau yog siv rau hauv cov cuab yeej siv, cov cuab yeej precision, thiab lwm yam, thiab tsis yog siv cov yas rau kev sib cuag zaub mov txhua hnub.
4. Qee qhov tsis zoo polyester resins: Bisphenol A tau ntxiv rau qee cov qauv kev hloov kho, txhim kho cov khoom toughness thiab corrosion kuj. Cov no feem ntau pom nyob rau hauv cov pob zeb dag, cov khoom fiberglass, thiab lwm yam.
IV. Feem ntau BPA- cov khoom yas dawb
Dhau li ntawm ABS yas, ntau lwm yam yas siv nyob rau hauv lub neej txhua hnub yog BPA-dawb thiab muaj kev nyab xeeb heev, haum rau kev sib cuag zaub mov thiab cov khoom me nyuam. Cov no suav nrog:
1. ABS Yas: Raws li tau hais los saum no, ABS yas yog BPA-dawb, nyab xeeb, thiab ruaj khov, ua rau nws yog ib qho khoom siv zoo tshaj plaws rau cov khoom siv, cov khoom ua si, cov khoom ua si, thiab lwm yam khoom.
2. Polypropylene (PP, cov cim yas 5): Cov tshuaj lom neeg ruaj khov, cua sov- tiv taus (tuaj yeem tiv taus qhov kub siab tshaj 100 degree), thiab acid thiab alkali resistant, nws tuaj yeem siv rau microwave cua sov thiab ua noj ua haus, thiab tam sim no yog cov khoom siv tseem ceeb hauv kev nyab xeeb rau cov ntim khoom noj, cov thawv noj su, khob dej, thiab cov me nyuam lub raj mis.
3. Polyethylene (PE, yas cim 2 lossis 4): Muab faib ua siab - ntom polyethylene (HDPE) thiab qis- ntom polyethylene (LDPE), nws yog tshuaj lom neeg ruaj khov, tsis yog- tshuaj lom, tsis muaj ntxhiab, thiab BPA-dawb, dav siv hauv ntim khoom noj, tub ntim khoom, lub raj mis thiab dej haus.
4. Polyethylene terephthalate (PET, yas cim 1): siab pob tshab, zoo txhua yam muaj zog, BPA-dawb, feem ntau yog siv hauv lub raj mis haus thiab ntim khoom noj. Txawm li cas los xij, nws cov cua sov ua haujlwm tsis zoo, haum rau kev siv ib leeg, thiab tsis pom zoo rau rov siv dua hauv dej kub.
5. Polyphenylsulfone (PPSU): Kub resistant, hydrolysis resistant, muaj kev nyab xeeb thiab tsis muaj - tshuaj lom, BPA- dawb, feem ntau siv nyob rau hauv siab - cov me nyuam mos fwj thiab cov khoom siv kho mob, ib qho kev xaiv zoo tshaj rau PC yas.
6. Copolyester (PCTG/Tritan): Tshwj xeeb tsim los hloov BPA- muaj cov yas PC, nws yog pob tshab, cuam tshuam- tiv taus, thiab tshav kub- resistant, cov khoom noj khoom haus sib cuag, thiab tag nrho BPA - dawb.
7. Polystyrene (PS) thiab High-Impact Polystyrene (HIPS): BPA-dawb. PS feem ntau yog siv rau hauv cov khoom siv pov tseg, ntim khoom noj, thiab cov ntaub ntawv ua npuas ncauj, thaum HIPS feem ntau yog siv rau hauv cov khoom siv thiab cov khoom siv txhua hnub.
8. TPE / TPR elastomers: cov ntaub ntawv mos uas muaj kev ywj pheej zoo thiab kev nyab xeeb, tsis muaj BPA thiab cov yas yas, feem ntau siv rau hauv cov menyuam yaus cov khoom ua si, tes tuav cov khoom siv txhua hnub, cov ntsaws ruaj ruaj, thiab lwm yam.
