Hauv kev lag luam polyurethane foaming, txij li HCFC-141b tau raug ncaws tawm tag nrho, cyclopentane tau dhau los ua qhov tsis muaj kev cuam tshuam rau cov khoom siv hauv tsev thiab vaj huam sib luag. Qhov teeb meem mob taub hau tshaj plaws rau ntau tus neeg tsim qauv tsuas yog paub txog qhov system no yog: siv tib lub polyether polyol ua ke, tom qab hloov mus rau cyclopentane, thermal conductivity ntawm cov npuas dej tsuas yog tsis tuaj, thiab lub tub yees lub zog noj qhov taw qhia raug quab yuam rub los ntawm ib nrab qib. Qhov tseeb, qhov teeb meem thermal conductivity ntawm cyclopentane + polyether foaming system yeej tsis tau hais txog tawv ncauj tsom rau ib qho qhia; nws yog ib qho kev xam zoo txog qhov sib npaug ntawm cov roj, cov khoom, thiab cov theem ua kua.
Lub hauv paus thermal conductivity ntawm cyclopentane siab dua li ntawm 141b yog ib txoj cai ntawm lub cev hlau, tab sis qhov no tsis tau txhais hais tias lub polyether foaming system tsis tuaj yeem ua tiav thawj -cov qauv kev siv hluav taws xob hauv chav kawm. Qhov tseem ceeb nyob rau hauv yuav ua li cas los them rau qhov sib txawv no los ntawm formulation optimization.
Peb yuav tsum ntsib qhov tseeb. Raws li cov ntaub ntawv xeem los ntawm ASTM C518 thiab lwm yam kev ntsuas cov khoom siv rwb thaiv tsev, cov pa roj-theem thermal conductivity ntawm cyclopentane ntawm 25℃yog kwv yees li 14.0-14.5 mW / m·K, thaum lub qub 141b tsuas yog hais txog 10.0. Qhov no txhais tau hais tias, tsuas yog nyob rau hauv cov nqe lus ntawm "gas" nyob rau hauv lub kaw hlwb, cyclopentane twb ploj lawm.
Tab sis tsis txhob ntshai. Lub thermal conductivity ntawm nruj polyurethane ua npuas ncauj tsis yog additive; nws yog ib qho kev xav txog ntawm ntau hom kev hloov hluav taws xob. Tsuav koj tuaj yeem tsim qhov txawv ntawm lwm qhov ntev, tag nrho cov thermal conductivity tseem tuaj yeem ua tau zoo heev. Qhov no xav kom peb ua ntej nkag siab txog cov ntsiab lus ntawm thermal conductivity:
| Cheebtsam ntawm Thermal conductivity | Thaum tshav kub kub hloov tshuab | Cov xwm txheej tam sim no thiab cov ntsiab lus mob hauv Cyclopentane System | Optimization Breakthrough |
|---|---|---|---|
| Gas -Phase Thermal conductivity | Molecular collision tshav kub hloov ntawm cov roj foaming hauv hlwb | Pom tseeb qhov tsis zoo: Tus nqi ntawm cov cyclopentane (~ 14.5) siab dua li ntawm 141b (10.0) | Hloov tsis tau lub cev muaj zog; tsuas tuaj yeem tuav cov kab hauv qab los ntawm kev kaw ntau dua -cov ntsiab lus ntawm tes los tiv thaiv huab cua (kwv yees li 26) los ntawm kev sib xyaw. |
| Khoom -Phase Thermal conductivity | Kev coj los ntawm polyurethane cell phab ntsa (polyether + isocyanate polymer) | Kev faib ua feem loj: Lub cev pob txha polymer ntawm cov txheej txheem polyether yog tuab heev | Core optimization point: Ua kom cov kev ua haujlwm ntawm polyether pib (xws li, siv sucrose / aromatic amine polyethers) kom txo tau cov polymer thermal kuj. |
| Radiation Thermal Conductivity | Infrared tshav kub tawg nkag mus rau hauv lub cell sab hauv | Hidden killer: Lub cell loj dua, qhov hnyav dua qhov hluav taws xob hluav taws xob nkag mus | Core optimization point: Siv siab -kev ua tau zoo silicone surfactant kom txo cov cell loj kom qis dua 100-150 microns. |
Lub thermal conductivity ntawm polyurethane ua npuas ncauj yog tsim los ntawm peb qhov superimposed: roj theem, khoom theem, thiab hluav taws xob theem. Qhov tsis zoo ntawm cyclopentane feem ntau yog nyob rau hauv cov pa roj-theem thermal conductivity, thaum qhov kev ua kom zoo ntawm polyether system tsom rau kev txo cov khoom-theem thiab hluav taws xob-theem thermal conductivity.
Thaum koj nkag siab cov lus saum toj no, cov kev taw qhia rau kev hloov kho kom meej meej. Txij li thaum peb tsis tuaj yeem hloov cov pa roj-theem thermal conductivity, peb yuav tsum pib nrog cov polyether polyol. Yog tias cov pa polyether polyols muaj tus nqi qis hydroxyl thiab siab molecular hnyav, qhov sib txuas sib txuas tsis txaus, cov phab ntsa ntawm tes yuav tuab heev, thiab cov khoom siv-theem thermal conductivity yuav nyob siab.
Hauv kev xyaum, cov kws paub txog kev tsim qauv qhia siab -functionality polyethers (xws li polyether systems pib nrog sucrose los yog aromatic amines) kom cov crosslinking network ntom ntom ntawm polyurethane, ua rau cov phab ntsa ntawm tes nyias thiab muaj zog. Nyob rau tib lub sijhawm, 配合 nrog cov organosilicon surfactants zoo heev (ua npuas dej stabilizers), thaum lub sij hawm ntawm cyclopentane vaporization thiab nthuav, cov kua zaj duab xis yog ruaj khov, thiab txoj kab uas hla ntawm tes raug quab yuam tswj hauv 150 microns. Qhov me me ntawm cov hlwb thiab lawv cov lej ntau dua, qhov ntau ntawm cov kev xav thiab tawg ntawm cov hluav taws xob hluav taws xob infrared ntawm cov phab ntsa ntawm tes nce ntxiv, thiab cov hluav taws xob thermal conductivity tuaj yeem txo qis. Qhov kev sib xyaw ua ke ntawm kev ntsuas no txaus los them rau qhov tsis zoo ntawm cyclopentane cov pa roj-theem thermal conductivity.
Lub purity ntawm cyclopentane tshuab tshuab (tshwj xeeb tshaj yog ya raws thiab qis -boiling-point impurities) ncaj qha txiav txim siab qhov ruaj khov ntawm polyether system cov tshuaj tiv thaiv thiab 最终 ceev ntawm lub cell qauv. Ntau dhau impurities yuav ua rau kom tag nrho cov thermal conductivity.
Qhov no yog qhov zais qhov loj uas ntau tus neeg tsim khoom tau yooj yim poob rau hauv. Qee lub tuam txhab, txhawm rau txuag nyiaj, yuav cov pentane crude nrog purity tsuas yog 98% lossis qis dua. Cov khoom siv no feem ntau muaj me me ntawm isopentane, cyclopentadiene, thiab txawm tias cov dej noo.
Nyob rau hauv cov txheej txheem polyether foaming, isopentane muaj qhov kub siab qis (27 degree). Thaum nws khiav tawm sai heev thaum lub sij hawm foaming, nws rhuav tshem cov zaj duab xis tsim ntawm cov npuas stabilizer, ncaj qha mus rau cell coalescence thiab ib tug ntse nce nyob rau hauv qhib - cov ntsiab lus ntawm tes. Thaum cov hlwb qhib, huab cua (nrog thermal conductivity ntawm 26 mW / m·K) yuav rov qab mus rau hauv lub hlwb, thiab cov roj-theem thermal conductivity tam sim ntawd poob. Moisture yog qhov ntau dua ntawm "ua npuas dej lom". Nws reacts nrog isocyanate los tsim cov pa roj carbon dioxide, tsis tsuas yog siv cov khoom kim dub xwb tab sis kuj tsim cov npuas loj hauv zos, ua rau cov pob txha hauv cov qauv ua npuas ncauj. Yog tias cov khoom siv tsis huv, txawm tias koj cov qauv polyether zoo npaum li cas, nws yuav tsis muaj txiaj ntsig.
Raws li cov chaw tsim khoom, ZL Energy's ultra- siab- purity cyclopentane ntawm ntau dua 99.5% tuaj yeem zam qhov tsis zoo ntawm kev sib raug zoo nrog cov txheej txheem polyether thiab coarsening ntawm cov hlwb los ntawm cov khoom siv raw impurities, tiv thaiv qis thermal conductivity los ntawm cov khoom siv hauv qab.
Ua kom qis -thermal- conductivity ua npuas ncauj zoo li tsim lub skyscraper. Yog tias lub hauv paus tsis ruaj khov, txawm li cas los xij zoo li cov txheej txheem polyether saum toj no, nws yuav tawg. Hauv kev daws qhov mob thermal conductivity point ntawm lub foaming system, ZL Energy plays lub luag hauj lwm ntawm "nthuav lub hauv paus."
Raws li cov kws tshaj lij cyclopentane chaw tsim khoom, ZL Zog nkag siab tob txog lub zog puas tsuaj ntawm impurities ntawm polyether foaming system. Los ntawm lawv tus kheej txoj kev sib sib zog nqus distillation, lawv ncaj qha nce purity ntawm cyclopentane mus rau tus qauv siab tshaj 99.5%. Qhov no txhais li cas? Nws txhais tau hais tias nyob rau hauv ZL Energy's cyclopentane, cov teeb meem no - ua isopentane lub teeb Cheebtsam, olefin impurities uas ua rau gelation, thiab tsis tshua muaj neeg ya raws tau tag nrho cov raug tshem tawm mus rau tsis tshua muaj ppm theem.
Thaum koj koom nrog ZL Zog lub siab -purity cyclopentane rau hauv lub cev polyether, koj yuav pom tias qhov sib xyaw ua ke ntawm cov khoom sib xyaw yog zoo heev, "lub sij hawm cream" thiab "nce lub sij hawm" thaum lub sij hawm foaming yog qhov ruaj khov heev, cov silicone surfactant tuaj yeem siv nws qhov kev ua tau zoo tshaj plaws yam tsis muaj kev cuam tshuam, thiab cov txiaj ntsig tau zoo, zoo ib yam, thiab 1}sponge. Tsis muaj npuas loj txawv txav, tsis muaj qhib- cell tawg, kaw- cov ntsiab lus ntawm tes tsis tu ncua sawv saum toj 90%, huab cua tsis tuaj yeem nkag mus, thiab cov thermal conductivity poob qis tsis tu ncua, pab koj ua kom zoo dhau thawj -chav kawm hluav taws xob kev ua haujlwm dhau los.
