Taw qhia ntawm foaming tus neeg saib xyuas rau polyurethane rigid ua npuas ncauj siv nyob rau hauv kev tsim kho teb
Nrog rau kev nce ntxiv ntawm cov tsev niaj hnub rau kev txuag hluav taws xob thiab kev tiv thaiv ib puag ncig, thermal rwb thaiv tsev kev ua tau zoo ntawm cov khoom siv hauv tsev ua ntau dua thiab tseem ceeb. Ntawm lawv, polyurethane txhav ua npuas ncauj yog ib qho zoo heev thermal rwb thaiv tsev cov ntaub ntawv, nrog zoo mechanical zog, tsis tshua muaj thermal conductivity thiab lwm yam zoo, yog li nws yog dav siv nyob rau hauv lub tshav pob ntawm lub tsev rwb thaiv tsev.
Foaming tus neeg sawv cev yog ib qho tseem ceeb additives nyob rau hauv zus tau tej cov polyurethane nyuaj ua npuas ncauj. Raws li nws cov txheej txheem kev ua haujlwm, nws tuaj yeem muab faib ua ob pawg: tshuaj lom neeg foaming tus neeg saib xyuas thiab lub cev foaming tus neeg sawv cev.
Kev faib tawm ntawm cov neeg ua npuas ncauj
Cov tshuaj ua npuas ncauj yog ib qho tshuaj ntxiv uas ua rau cov khoom siv roj thiab foams polyurethane thaum lub sij hawm cov tshuaj tiv thaiv ntawm isocyanates thiab polyols. Dej yog tus neeg sawv cev ntawm cov tshuaj ua npuas dej, uas ua rau cov khoom siv isocyanate los tsim cov pa roj carbon dioxide, thiaj li ua rau cov khoom siv polyurethane ua npuas dej. Lub cev foaming tus neeg sawv cev yog ib qho ntxiv ntxiv rau hauv cov txheej txheem ntawm polyurethane nyuaj ua npuas ncauj, uas foams polyurethane cov ntaub ntawv los ntawm lub cev ua ntawm roj. Cov neeg ua npuas ncauj lub cev yog cov khoom siv hluav taws xob qis qis, xws li hydrofluorocarbons (HFC) lossis alkane (HC) compounds.
Txoj kev loj hlob ntawmua npuas ncaujpib thaum xyoo 1950s, DuPont lub tuam txhab siv trichloro-fluoromethane (CFC-11) ua polyurethane tawv foaming tus neeg sawv cev, thiab tau txais cov khoom lag luam zoo dua, txij li thaum CFC-11 tau siv dav hauv thaj chaw ntawm polyurethane nyuaj ua npuas ncauj. Raws li CFC-11 tau ua pov thawj los ua kom puas lub ozone txheej, Western European lub teb chaws tau nres siv CFC-11 thaum kawg ntawm xyoo 1994, thiab Tuam Tshoj kuj tau txwv tsis pub tsim thiab siv CFC-11 xyoo 2007. Tom qab ntawd, Tebchaws Asmeskas thiab Europe tau txwv tsis pub siv. ntawm CFC-11 hloov HCFC-141b hauv 2003 thiab 2004, feem. Raws li kev paub txog ib puag ncig nce, cov teb chaws tab tom pib tsim thiab siv lwm txoj hauv kev uas muaj peev xwm ua kom sov ntiaj teb qis (GWP).
Hfc-type foam agents tau hloov ib zaug rau CFC-11 thiab HCFC-141b, tab sis GWP tus nqi ntawm HFC-hom tebchaw tseem yog qhov siab, uas tsis tsim nyog rau kev tiv thaiv ib puag ncig. Yog li ntawd, nyob rau hauv xyoo tas los no, txoj kev loj hlob tsom ntawm cov neeg ua npuas ncauj hauv kev tsim kho kev lag luam tau hloov mus rau cov kev xaiv qis-GWP.
Pros thiab cons ntawm foam agents
Raws li cov khoom siv rwb thaiv tsev, polyurethane txhav ua npuas ncauj muaj ntau yam zoo, xws li kev ua haujlwm zoo thermal rwb thaiv tsev, zoo txhua yam muaj zog, zoo suab haum kev ua tau zoo, kev pab lub neej ntev thiab lwm yam.
Raws li ib qho tseem ceeb pab nyob rau hauv kev npaj ntawm polyurethane nyuaj ua npuas ncauj, foaming tus neeg saib xyuas muaj ib qho tseem ceeb cuam tshuam rau kev ua tau zoo, nqi thiab ib puag ncig tiv thaiv ntawm thermal rwb thaiv tsev ntaub ntawv. Qhov zoo ntawm cov tshuaj foaming tus neeg sawv cev yog ceev foaming ceev, uniform foaming, yuav siv tau nyob rau hauv ib tug ntau yam ntawm kub thiab av noo, yuav tau txais ib tug siab foaming tus nqi, thiaj li mus npaj high-kev ua tau zoo polyurethane rigid ua npuas ncauj.
Txawm li cas los xij, cov tshuaj ua npuas ncauj tuaj yeem tsim cov pa phem, xws li carbon dioxide, carbon monoxide thiab nitrogen oxides, ua rau muaj kuab paug rau ib puag ncig. Qhov zoo ntawm tus neeg sawv cev ua npuas ncauj yog tias nws tsis tsim cov pa phem, muaj kev cuam tshuam me ntsis rau ib puag ncig, thiab tuaj yeem tau txais cov npuas me me thiab kev ua haujlwm zoo ntawm rwb thaiv tsev. Txawm li cas los xij, cov neeg ua npuas lub cev muaj qhov ua kom qeeb qeeb thiab yuav tsum tau kub thiab av noo ntau dua los ua qhov zoo tshaj plaws.
Raws li cov khoom siv rwb thaiv tsev, polyurethane txhav ua npuas ncauj muaj ntau yam zoo, xws li kev ua haujlwm zoo thermal rwb thaiv tsev, zoo txhua yam muaj zog, zoo suab haum kev ua tau zoo, kev pab lub neej ntev thiab lwm yam.
Raws li ib tug tseem ceeb pab nyob rau hauv kev npaj ntawmpolyurethane nyuaj ua npuas ncauj, foaming tus neeg saib xyuas muaj qhov cuam tshuam tseem ceeb ntawm kev ua haujlwm, nqi thiab kev tiv thaiv ib puag ncig ntawm cov ntaub ntawv thermal rwb thaiv tsev. Qhov zoo ntawm cov tshuaj foaming tus neeg sawv cev yog ceev foaming ceev, uniform foaming, yuav siv tau nyob rau hauv ib tug ntau yam ntawm kub thiab av noo, yuav tau txais ib tug siab foaming tus nqi, thiaj li mus npaj high-kev ua tau zoo polyurethane rigid ua npuas ncauj.
Txawm li cas los xij, cov tshuaj ua npuas ncauj tuaj yeem tsim cov pa phem, xws li carbon dioxide, carbon monoxide thiab nitrogen oxides, ua rau muaj kuab paug rau ib puag ncig. Qhov zoo ntawm tus neeg sawv cev ua npuas ncauj yog tias nws tsis tsim cov pa phem, muaj kev cuam tshuam me ntsis rau ib puag ncig, thiab tuaj yeem tau txais cov npuas me me thiab kev ua haujlwm zoo ntawm rwb thaiv tsev. Txawm li cas los xij, cov neeg ua npuas lub cev muaj qhov ua kom qeeb qeeb thiab yuav tsum tau kub thiab av noo ntau dua los ua qhov zoo tshaj plaws.
Kev txhim kho yav tom ntej
Cov qauv ntawm foaming agents nyob rau hauv lub tsev lag luam yav tom ntej yog tsuas yog mus rau kev loj hlob ntawm tsawg GWP hloov. Piv txwv li, CO2, HFO, thiab lwm yam dej, uas muaj tsawg GWP, xoom ODP, thiab lwm yam kev ua haujlwm ib puag ncig, tau siv dav hauv kev tsim cov polyurethane txhav ua npuas ncauj. Tsis tas li ntawd, raws li cov cuab yeej siv hluav taws xob hauv tsev txuas ntxiv txhim kho, tus neeg sawv cev foaming yuav txhim kho kev ua tau zoo dua qub, xws li kev ua haujlwm zoo rwb thaiv tsev, ntau dua foaming tus nqi, thiab cov npuas me me.
Nyob rau hauv xyoo tas los no, cov tuam txhab tshuaj organofluorine hauv tsev thiab txawv teb chaws tau nquag tshawb nrhiav thiab tsim cov tshuaj fluorine uas muaj lub cev ua npuas ncauj, nrog rau cov tshuaj fluorinated olefins (HFO) foaming agents, uas yog hu ua cov neeg ua foaming tiam plaub thiab yog ib lub cev foaming agents nrog roj zoo. theem thermal conductivity thiab ib puag ncig cov txiaj ntsig.
Post lub sij hawm: Jun-21-2024