Txij li thaum cov theem ua tiav - tawm ntawm HCFC-141b hauv kev lag luam polyurethane ua npuas ncauj nruj, cyclopentane tau dhau los ua lub hauv paus tseem ceeb rau cov txheej txheem rwb thaiv tsev ntawm cov tub yees, lub tub yees, thiab lub tshuab ua dej kub. Txawm li cas los xij, cov neeg tsim qauv ntawm cov kab hauv ntej ntawm kev sim pwm paub tias cyclopentane muaj qhov ua rau tuag taus: tsis tshua muaj dej txaus. Tau ntsib nrog cov khoom siv tub yees ntau dua thiab cov kab L-shaped complex, cov kua ntshiab cyclopentane tsis tuaj yeem ntws mus rau qhov chaw txhua, ua rau cov voids hauv qab vaj huam sib luag. Txhawm rau daws qhov teeb meem no, "cyclopentane + isopentane" tov foaming tov tau tshwm sim, thiab tam sim no tau dhau los ua tus qauv tsis hais rau cov tuam txhab khoom siv hauv tsev.
Lub ntsiab lus ntawm kev sib xyaw ua npuas ncauj nrog cyclopentane thiab isopentane yog siv cov ntsiab lus qis qis kom zoo dua ntawm isopentane los quab yuam rub lub cyclopentane, yog li nrhiav tau qhov zoo tshaj qhov sib npaug ntawm thermal rwb thaiv tsev kev ua tau zoo thiab pwm filling flowability.
Ob tug kwv tij no yog ob tus tswv cuab ntawm tsev neeg C5, nrog cov ntaub ntawv ib puag ncig tsis zoo (ODP=0, GWP qis heev), tab sis lawv tus kheej yog qhov sib txawv kiag li. Cyclopentane muaj qhov kub kub (49.3 degree), vaporizes maj mam thaum foaming, thiab cov phab ntsa ntawm tes nthuav dav, yog li nws muab cov rwb thaiv tsev zoo tab sis txav qeeb. Isopentane muaj qhov kub siab qis (27.7 degree); sai li sai tau raws li nws tau txhaj rau hauv pwm, nws tam sim ntawd vaporizes tsausmuag, muab cov thrust muaj zog heev, tab sis siv nws ib leeg yuav ua rau thermal conductivity ntawm rwb thaiv tsev txheej rau skyrocket, thiab lub tub yees lub zog noj yuav Fundamental tsis dhau.
Kev sib xyaw ua ke txhais tau hais tias cia isopentane ua "bulldozer" lub luag haujlwm rau thawb cov kua polyether polyol rau hauv cov kab tuag ntawm cov pwm, thaum cyclopentane nyob twj ywm rau hauv qhov chaw maj mam "tsim phab ntsa" lub luag haujlwm rau rwb thaiv tsev. Cia peb siv cov ntaub ntawv los sib piv qhov sib txawv ntawm lub cev qhov sib txawv ntawm ob:
| Core Physical Property Indicator | Cyclopentane (C₅H₁₀) | Isopentane (i-C₅H₁₂) | Lub luag haujlwm tseem ceeb hauv kev sib xyaw ua npuas ncauj |
|---|---|---|---|
| Kub Point (degree) | 49.3 | 27.7 | Isopentane muaj qhov boiling tsawg, muab lub zog ua npuas ncauj thaum ntxov thiab txhim kho flowability; cyclopentane tswj cov cell stability tom qab. |
| Thermal conductivity (mW/m·K) | Kwv yees li 14.5 | Kwv yees li 16.0 | Cyclopentane yog lub hauv paus rau kev rwb thaiv tsev; Ntxiv ntau isopentane yuav ncaj qha nce tag nrho cov thermal conductivity, ua rau lub zog efficiency tsis ua raws li cov qauv. |
| Vapor Siab (20 degree, kPa) | Kwv yees li 35 | Kwv yees li 70 | Isopentane muaj lub siab vapor siab, ua rau lub zog siab dua thaum lub caij ntuj sov cia, kev thauj mus los, thiab ua npuas dej, tso ntau qhov xav tau ntawm cov khoom sib khi. |
| Kev ua haujlwm hauv PU | Zoo rwb thaiv tsev, tsis tshua muaj flowability | Zoo flowability, kuj tsis zoo rwb thaiv tsev | Qhov ob yuav tsum tau muab sib xyaw ua ke hauv qhov sib piv nruj, txhua qhov nyiaj them rau lwm tus qhov tsis muaj zog; ib qho kev tsis sib haum xeeb hauv qhov piv yuav ua rau seem. |
Kev lag luam tseem ceeb sib xyaw piv ntawm cyclopentane / isopentane yog concentrated ntawm 70:30 thiab 60:40. Qhov kev piv txwv tshwj xeeb yuav tsum tau txiav tawm rov qab raws li cov qauv kev ua haujlwm nyuaj ntawm cov khoom siv hauv tsev ua ke nrog lub teb chaws tus qauv kev siv hluav taws xob zoo.
Tsis muaj ib qho piv txwv yog kho tau -tag nrho. Raws li qhov yuav tsum tau muaj rau rwb thaiv tsev txheej thermal conductivity thiab ntom nyob rau hauv "Technical Specification for Rigid Polyurethane Foam for Household Refrigerating Appliances" (GB/T 26703), cov neeg tsim qauv feem ntau txiav txim siab qhov piv ntawm cov hauv qab no:
Yog hais tias nws yog ib tug ncaj qha - lub tub yees txias nrog ib tug kuj yooj yim qauv thiab ib tug tuab rwb thaiv tsev txheej, qhov kev faib ua feem ntawm cyclopentane yuav nce mus rau 70% los yog txawm 80% mus suppress lub thermal conductivity ntau li ntau tau. Yog tias nws yog Frost -free tub yees los yog lub freezer nrog ib qho yooj yim folded evaporator rov qab vaj huam sib luag, qhov feem ntawm isopentane yuav tsum tau nce mus rau 40% los yog txawm 50% kom ruaj khov kom flowability, tiv thaiv "pob npuas" thiab "voids."
Tab sis muaj lub qab nthab ntawm no: ib zaug isopentane tshaj 40%, lub thermal conductivity ntawm tag nrho cov foaming system yuav tawg los ntawm qhov tseem ceeb, thiab lub tub yees compressor yuav tsum tau nce nws cov kev khiav hauj lwm load kom tsis txhob kub, ntawm qhov tsis tooj, siv hluav taws xob ntau. Yog li ntawd, qhov nyuaj ntawm kev sib tov yog nyob rau hauv "taug kev nruj nreem" nyob rau hauv lub caij nqaim no.
Kev kam rau siab ntawm kev sib xyaw foaming system rau raw khoom impurities txo exponentially. Cov kab ntawm cov dej noo los yog olefin impurities tuaj yeem ua rau kev sib raug zoo ntawm ob lub ntsiab lus kom tawg, ncaj qha ua rau cov hlwb ntxhib thiab hauv zos shrinkage.
Qhov no yog qhov uas ntau lub tsev me me uas yooj yim ua yuam kev thaum ua cov foaming sib xyaw. Ntshiab cyclopentane muaj qee qhov kev zam rau impurities, tab sis ib zaug isopentane sib xyaw, "fragility" ntawm lub kaw lus yog amplified.
Vim li cas? Vim tias muaj qhov sib txawv me me hauv qhov tsis sib xws ntawm cyclopentane thiab isopentane hauv polyether sib xyaw. Yog tias koj lub cyclopentane muaj ntau ppm ntawm cyclopentadiene (olefin), lossis yog tias koj cov isopentane muaj cov dej noo ntau dhau, cov impurities no yuav dhau los ua cov neeg tua neeg ntawm "emulsifier," ua rau cov kua foaming mus rau kev sib cais ntawm micro theem thaum ntxov ntawm cov tshuaj tiv thaiv. Qhov tshwm sim yog: wrinkled ua npuas ncauj nto, tsis sib xws ntawm tes tom qab txiav (qee yam zoo li paj rwb, ib txhia zoo li ib tug honeycomb), ib tug ntse poob nyob rau hauv lub zos ceev, thiab lub rwb thaiv tsev kev ua tau zoo ncaj qha scraped.
Raws li cov chaw tsim khoom lag luam hauv C5 kev lag luam saw, ZL Energy lub ntsiab lus zoo nyob hauv nws lub peev xwm los muab cov khoom sib xyaw ua ke nrog cov purity siab heev thiab cov kev hloov pauv tau zoo, zam tag nrho cov neeg siv khoom qis los ntawm kev pheej hmoo ntawm kev tsis zoo ntawm kev tswj los ntawm tus kheej - sib tov.
Tam sim no, kev coj ua ntawm ntau cov nroj tsuag polyurethane yog: yuav lub tanker ntawm cyclopentane, yuav lub tanker ntawm isopentane, thiab sib tov nrog lub hose hauv lawv lub Hoobkas. Qhov kev phom sij loj tshaj plaws ntawm "txoj kev tsis zoo" no yog qhov sib xyaw tsis sib xws thiab qhov sib piv drift. Thaum lub metering twj tso kua mis muaj qhov sib txawv, cov khoom siv niaj hnub no yooj yim ua npuas dej, tab sis tag kis cov khoom yuav raug muab pov tseg tag nrho.
Raws li cov kws tshaj lij cyclopentane chaw tsim tshuaj paus, ZL Zog muab qhov "turnkey" theem ntawm kev pabcuam rau cov kev daws teebmeem sib xyaw. Kev vam khom rau nws cov chav sib sib zog nqus tob tob, ZL Zog tuaj yeem ruaj khov ntawm cov purity ntawm ob qho tib si cyclopentane thiab isopentane ntawm ntau dua 99.5%, txo tag nrho cov ntsiab lus sulfur kom qis dua 1 ppm, txiav tawm ntawm qhov muaj peev xwm ntawm olefins thiab noo noo rhuav tshem kev sib raug zoo.
Qhov tseem ceeb tshaj, ZL Zog tuaj yeem ua ncaj qha rau kev sib xyaw ua ke hauv nws cov nroj tsuag. Txawm hais tias koj xav tau qhov kev cai sib piv ntawm 70: 30 lossis 65: 35, qhov sib piv ntawm qhov yuam kev ntawm txhua pawg ntawm cov khoom sib xyaw uas xa los ntawm ZL Zog yog tswj nyob rau hauv qhov kev hloov pauv me me. Cov khoom siv hauv tsev hauv qab thiab cov tuam txhab foaming tuaj yeem siv ncaj qha thaum tau txais yam tsis muaj kev tsim kho cov tso tsheb hlau luam ntxiv lossis kho qhov sib piv, tsis tsuas yog txuag cov peev txheej kim hauv kev tawg- cov khoom pov thawj sib xyaw tab sis tseem rub cov batch stability ntawm lub foaming system mus rau qhov siab tshaj plaws. Qhov no yog qhov tiag tiag qhov chaw - qib kom zoo dua uas pab cov lag luam txo cov nqi thiab nce kev ua tau zoo.
