Dab tsi yog plasticizer siv rau?
Plasticizers yog ib qho tseem ceeb ntawm ntau yam khoom siv niaj hnub peb ntsib. Cov tshuaj no ua lub luag haujlwm tseem ceeb hauv kev tsim khoom thiab kev siv kawg ntawm ntau yam ntaub ntawv, tshwj xeeb tshaj yog cov polymers. Hauv tsab xov xwm no, peb yuav tshawb xyuas cov haujlwm tseem ceeb ntawm cov yas yas, lawv cov ntau hom, kev siv, thiab cov kev txhawj xeeb txog kev noj qab haus huv cuam tshuam nrog lawv cov kev siv.
Taw qhia rau Plasticizers:
Plasticizers yog cov khoom siv ntxiv rau cov polymers los txhim kho lawv qhov yooj yim, elongation, thiab ua haujlwm tau zoo. Lawv feem ntau tsis tshua muaj qhov hnyav molecular sib txuas uas tuaj yeem muab faib ua ob hom: thawj thiab theem nrab plasticizers.
Primary plasticizers muaj kev sib raug zoo nrog cov polymer matrix thiab ntxiv rau lub sijhawm ua haujlwm. Lawv ua lub luag haujlwm tseem ceeb hauv kev txo cov iav hloov pauv kub (Tg) ntawm cov polymer, ua rau nws yooj yim dua thiab yooj yim rau cov duab. Ntawm qhov tod tes, cov plasticizers theem nrab tau ntxiv tom qab tsim khoom los txhim kho cov khoom siv tau yooj yim thiab ua haujlwm ntev.
Lub luag haujlwm thiab txiaj ntsig ntawm Plasticizers:
Plasticizers muaj ntau lub luag haujlwm thiab cov txiaj ntsig hauv kev tsim thiab siv cov khoom siv polymers. Cia peb delve rau hauv qee lub luag haujlwm tseem ceeb uas lawv ua:
1. Txhim kho kev ua haujlwm:Los ntawm kev txo Tg ntawm polymers, plasticizers txhim kho lawv cov yoog raws, ua rau lawv yooj yim dua thiab yooj yim rau txheej txheem thaum tsim khoom. Qhov no ua rau kev txhim kho kev ua haujlwm tau zoo thiab tso cai rau cov duab nyuaj tsim.
2. Nce Flexibility thiab Strength:Plasticizers txhim khu lub polymer cov khoom elongation, uas ua rau cov khoom kawg hloov tau yooj yim dua thiab tsis tshua muaj kev tawg lossis tawg hauv kev ntxhov siab. Cov yam ntxwv no yog qhov tseem ceeb tshwj xeeb hauv cov ntawv thov uas yuav tsum tau ua kom yooj yim thiab ua haujlwm ntev, xws li cov kav dej PVC lossis txheej txheej.
3. Enhanced Softness thiab Texture:Plasticizers muab cov polymers nrog cov mos mos thiab du, ua rau lawv yooj yim rau kov. Cov cwj pwm no yog qhov tshwj xeeb tshaj yog xav tau hauv cov ntawv thov xws li vinyl flooring lossis hluavtaws tawv.
4. Txhim kho Elasticity:Plasticizers nce elasticity ntawm polymers, tso cai rau lawv yooj yim rov qab mus rau lawv cov qub zoo tom qab deformation. Cov cuab yeej no yog qhov tseem ceeb hauv kev siv cov ntaub ntawv uas yuav tsum tau tiv thaiv rov qab khoov lossis ncab, xws li cov hlua roj hmab lossis cov hlua conveyor.
5. Txo Nqi:Plasticizers feem ntau yog siv los ua tus nqi tsim nyog ntxiv, vim lawv tuaj yeem hloov cov ntaub ntawv kim heev hauv qee daim ntawv thov. Los ntawm kev koom nrog cov khoom siv yas, cov tuam txhab tuaj yeem txo cov nqi tsim khoom tag nrho yam tsis muaj kev cuam tshuam qhov zoo lossis kev ua tau zoo ntawm cov khoom kawg.
Hom thiab kev siv ntawm Plasticizers:
Ntau hom plasticizers muaj, txhua tus tsim los rau cov txheej txheem polymer tshwj xeeb thiab kev siv. Cia peb tshawb xyuas qee cov khoom siv plasticizers thiab lawv cov kev siv cuam tshuam:
1. Phthalate Plasticizers:Phthalates yog cov khoom siv ntau tshaj plaws ntawm cov yas yas vim lawv qhov kev ua tau zoo tshaj plaws thiab tus nqi qis. Lawv feem ntau siv hauv cov khoom siv PVC, xws li cov kav dej, cables, flooring, thiab upholstery. Txawm li cas los xij, phthalates tau ua rau muaj kev txhawj xeeb txog lawv cov teebmeem kev noj qab haus huv, uas ua rau muaj kev txhim kho ntawm lwm cov plasticizers.
2. Non-Phthalate Plasticizers:Hauv kev teb rau kev noj qab haus huv thiab kev txhawj xeeb ntawm ib puag ncig, cov yas uas tsis yog phthalate tau txais cov koob npe zoo li kev nyab xeeb dua. Cov no muaj xws li adipates, citrates, sebacates, thiab ntau ntxiv. Cov yas yas uas tsis yog phthalate yog siv rau hauv ntau daim ntawv thov, suav nrog cov khoom siv kho mob, ntim khoom noj, cov khoom ua si, thiab cov khoom tu tus kheej.
3. Polymeric Plasticizers:Cov plasticizers no feem ntau yog siab molecular hnyav polymers uas muaj kev ruaj khov zoo thiab tsis tshua muaj kev tsiv teb tsaws chaw. Lawv feem ntau siv rau hauv daim ntawv thov uas qhov kev pheej hmoo ntawm leaching los yog extraction yog undesirable, xws li hlau thiab cable rwb thaiv tsev los yog automotive interiors.
4. Epoxy Plasticizers:Epoxy-raws li plasticizers yog dav siv hauv PVC daim ntaub ntawv uas yuav tsum tau thermal stability thiab zoo tsis kam mus volatilization. Lawv pom cov ntawv thov hauv cov hlau coatings, cov khoom siv tsheb, thiab cov ntaub ntawv hauv pem teb.
5. Bio-based Plasticizers:Nrog rau kev ua kom pom tseeb ntawm kev ruaj khov, bio-based plasticizers tau nce traction hauv xyoo tas los. Muab los ntawm cov khoom siv txuas ntxiv mus, xws li cov roj zaub lossis cov hmoov txhuv nplej siab, cov plasticizers no muaj lwm txoj hauv kev rau kev siv ntau yam.
Kev txhawj xeeb txog kev noj qab haus huv thiab ib puag ncig:
Txawm hais tias plasticizers ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom ntawm cov khoom siv polymers, kev txhawj xeeb tau tshwm sim txog lawv cov kev cuam tshuam tsis zoo rau tib neeg kev noj qab haus huv thiab ib puag ncig. Ib qho kev txhawj xeeb tseem ceeb tshaj plaws yog qhov muaj peev xwm leaching ntawm plasticizers los ntawm cov khoom mus rau ib puag ncig ib puag ncig lossis tib neeg lub cev. Phthalate plasticizers, tshwj xeeb, tau ua tiav kev tshawb fawb ntau vim lawv cov khoom estrogenic thiab muaj peev xwm txuas rau ntau yam teeb meem kev noj qab haus huv.
Cov koom haum tswj hwm thoob plaws ntiaj teb tau siv cov kev txwv rau kev siv qee yam plasticizers, tshwj xeeb tshaj yog cov uas muaj kev pheej hmoo rau kev noj qab haus huv. Cov kev cai no tsom xyuas kom muaj kev nyab xeeb ntawm cov neeg siv khoom thiab ib puag ncig. Cov neeg tsim khoom thiab cov kws tshawb fawb txuas ntxiv tshawb nrhiav thiab tsim cov kev nyab xeeb dua nrog kev noj qab haus huv thiab kev cuam tshuam ib puag ncig tsawg.
Xaus:
Hauv kev xaus, plasticizers yog cov khoom siv tseem ceeb uas txhim kho kev ua tau zoo thiab kev siv tau ntawm polymers. Lawv muab kev yooj yim, ua haujlwm tau, thiab muaj zog ntxiv rau ntau yam khoom uas peb ntsib hauv peb lub neej txhua hnub. Txawm li cas los xij, nws yog ib qho tseem ceeb uas yuav tsum tau ceev faj txog kev noj qab haus huv thiab kev txhawj xeeb ntawm ib puag ncig cuam tshuam nrog qee yam plasticizers. Kev tshawb fawb tsis tu ncua thiab kev txhim kho ntawm kev nyab xeeb lwm txoj hauv kev yuav txuas ntxiv tsav kev lag luam mus rau cov kev daws teeb meem zoo dua qub thiab eco.