TusPolyurethane Rigid Ua Npuas Ncauj Ua Ntej Tub YeesCov kev siv r refers rau kev siv polyurethane rigid ua npuas ua npuas ua ke thaum tsim hluav taws xob, txhawm rau txhim kho thermal rwb thaiv tsev thiab txhim kho kev ua hluav taws xob. Hauv qab no yog cov ncauj lus kom ntxaws saib xyuas:
Cov txheej txheem ntws ntawm polyether polyols siv rau tub yees?
01. Kev npaj
Raws li qhov loj me thiab kev tshwj xeeb ntawm lub tub yees, sib tov sib xws yog npaj thiab preheated, feem ntau rau ib tug kub ntawm 40℃thiab 60 degree. Nyob rau tib lub sijhawm, cov ntaub ntawv raw rau cov polyurethane rigid ua npuas ncauj tau npaj, suav nrog cov neeg sawv cev, catalals, thiab lwm yam, uas tau sib xyaw ua ke.
02. Sib xyaw thiab ua npuas ncauj
Lub npaj polyethol kev sib xyaw thiab isocyanate tau txhaj rau hauv cov pwm kab noj hniav uas siv lub tshuab npuas. Nyob rau hauv qhov kev txiav txim ntawm catalysts, cov sib tov undergoes cov tshuaj lom neeg sai sai thiab pib ua npuas ncauj, nthuav dav dav kom sau tag nrho cov kab noj hniav yooj yim. Thaum lub sijhawm tus txheej txheem no, lub tshuab tus neeg sawv cev vaporizes los tsim cov roj, ua rau ua npuas ncauj kom nthuav dav thiab tsim ib qho kev kaw polyurethane rigid ua npuas ncauj.
03. Kho thiab Txhim Kho
Tom qab foam ua siab ntev thiab ncav cuag lub zog txaus, nws nyob rau hauv kev kho. Nws yuav tsum nyob hauv cov pwm rau qee lub sijhawm, feem ntau tau ob peb teev, nyob ntawm cov khoom siv raw thiab cov txheej txheem tsis sib xws. Thaum kho tau, pwm tau qhib, thiab lub tub yees txee lossis lub qhov rooj raug tshem tawm.
04. Post -} Kev Kho Mob
Tom qab ua npuas ncauj, lub tub yees to taub qab, cov txheej txheem hauv qab cov txheej txheem ua npuas thiab burrs, ua raws li kev kuaj xyuas zoo thiab kev siv tshuab ua kom tau raws li cov kev ua tau zoo.
Dab tsi yogCov khoom siv xaiv?
01. Polyols
Polyols yog cov tseem ceeb ntawm polyurethane rigid ua npuas ncauj. Hom Hom muaj xws li polyether polyols thiab polyester polyols. Hom thiab cov khoom ntawm polyols cuam tshuam rau npuas ua npuas lub zog, lub zog, thiab thermal kuj. Piv txwv li, Polyether Polyols muab kev sib haum xeeb zoo thiab cuam tshuam, ua kom ua npuas dej nrog qis dua brittleness; Polyester Polyols muab lub zog siab dua thiab cov cua sov kuj, txhim kho qhov seem thiab thermal stability.
02. Isocyanates
Polymeric MDI yog feem ntau siv. Nws reacts nrog polyols los tsim cov txheej txheem txheem ntawm cov npaus hauv qab, muab lub zog thiab ruaj khov. Lub purity thiab kev ua haujlwm ntawm MDI tseem cuam tshuam ua npuas dej.
03. Tshuab tus neeg sawv cev
Tshuab cov neeg sawv cev xws li hydrocarbons xws li cyclopentane thiab isopentane, raws li zoo li LBA (Cyclonentane / Isopentane). Cov vaporize thaum lub sij hawm ua npuas dej los tsim cov roj, nthuav ua npuas dej. Cov neeg sawv cev sib txawv cuam tshuam rau ntawm cell loj, etcal conductivity, thiab lwm yam cyclotomentane muab kev ua npuas ncauj zoo thiab rwb thaiv tsev, muaj kev nyab xeeb dua.
04. Catalysts
Catalysts ua kom nrawm nrawm ua npuas ncauj, txhim kho ntau lawm, thiab cuam tshuam cov khoom ua npuas ncauj. Hom Hom muaj xws li catalysts thiab cov hlau catalysts, xws li Triethylene diethylenriamine (PMDETA), thiab Dimorpholinodiodihother etherhethy (dmdee). Txhua qhov catalystions sib txawv ntawm cov kev tiv thaiv; Kev xaiv qhov zoo tshaj plaws thiab kev sib xyaw ua ke rau cov smoother, ntau cov txheej txheem tswj cov txheej txheem ua npuas.