Dab tsi yogpolyurethane spray ua npuas ncauj?
Hauv kev tsim kho vaj tse ntiag tug, polyurethane ua npuas ncauj tau nce ntxiv.
Txawm li cas los xij, txhua leej txhua tus paub txog cov khoom no txij li thaum yau: cov roj hmab ua npuas dej - uas yog ib hom polyurethane ua npuas ncauj - yog siv los ua daim txhuam cev thiab tseem ua cov khoom ua si muag muag lossis cov menyuam yaus, cov rooj tog zaum.
Tau kawg, lwm hom polyurethane kuj tau siv los thaiv cov qauv hauv tsev, tab sis cov tshuaj lom neeg muaj pes tsawg leeg thiab cov hauv paus ntsiab lus kom tau txais cov khoom tseem zoo ib yam. Ib tug yam ntxwv ntawm tag nrho cov polyurethane foams yog ib tug high gas cov ntsiab lus, uas yog 90% ntawm tag nrho cov ntim ntawm khov loj.
Polyurethane ua npuas ncauj yog li no yog hais txog ib tug ntxeem tau cua-filled polymer raws li polyurethane Cheebtsam. Nyob ntawm seb cov khoom siv tshwj xeeb siv, cov khoom siv tuaj yeem yog elastic, elastic qauv (dua npuas roj hmab) lossis cov qauv nruj, feem ntau yog siv rau kev ntsuas thermal rwb thaiv tsev.
Thaum insulating qee lub tsev tsim, npaj ua insulating polyurethane ua npuas ncauj qhov chaw tuaj yeem siv tau, xws li panels, blocks, semi-cylinders (tube shells), thiab lwm yam. Txawm li cas los xij, qhov xav tau loj tshaj plaws yog rau cov khoom sib xyaw uas siv rau hauv cov kua hauv cov ntaub ntawv insulating. (los yog nchuav rau hauv kab noj hniav) tab sis muaj peev xwm ua rau nws tus kheej ua npuas ncauj thiab polymerize sai thiab tawv. Yog li ntawd, nyob rau hauv essence, qhov kev npaj ntawm yuav tsum muaj pes tsawg leeg yuav siv sij hawm qhov chaw ncaj qha nyob rau hauv lub rwb thaiv tsev ua hauj lwm qhov chaw.
Rau kev ua haujlwm loj, siv ob lub ntsiab lus. Feem ntau, cov cuab yeej siv niaj hnub no suav nrog kev siv cov polyols ua "A" thiab polyisocyanates li "B".
Thaum cov khoom sib xyaw no sib xyaw nrog cov dej me me, cov tshuaj tiv thaiv polymer synthesis tshwm sim thiab cov pa roj (qhov no, carbon dioxide) yog nquag tso tawm, uas ua rau muaj foamy, ntxeem tau, nruj qauv. Qhov no polyurethane ua npuas ncauj muaj ib tug kaw-cell qauv-feem ntau ntawm cov huab cua hlwb yog kiag li cais los ntawm cov hlwb nyob ib sab.
Tag nrho lwm yam yog sib npaug, qhov thermal conductivity ntawm carbon dioxide sau ib lub xovtooj ntawm tes yog qis dua li ntawm huab cua los ntawm ib feem peb (0.016 W/mx degree vs. 0.026 W/mx degree), uas yog Lwm qhov tseem ceeb ntawm kev kaw-cell polyurethane ua npuas ncauj yog nws lub peev xwm ua tau zoo thermal insulator.
Qee cov kws tshaj lij, cov tshuab ua haujlwm zoo siv Freon ua tus neeg sawv cev tshuab.