Thaum muas cov kav dej insulated lossis tshuaj xyuas qhov chaw ua haujlwm, ntau tus neeg siv khoom ib txwm kuaj xyuas cov xim ntawm polyurethane ua npuas ncauj. Tej zaum lawv yuav xav tias cov xim daj daj qhia tias cov khoom tsis huv, thaum cov xim sib dua qhia tau tias siab - cov ntaub ntawv zoo. Qhov ntxoov ntxoo ntawm cov xim puas tuaj yeem siv los txiav txim ua npuas dej zoo? Cov lus teb yog: nws ua haujlwm raws li kev siv, tab sis nws yuav tsum tsis yog tib qho kev ntsuas.
Xav txog ib qho tshwm sim: thaum feem ntau polyurethane ua npuas ncauj- cov kav dej insulated raug txiav qhib, lub nplhaib ntawm lub teeb daj -zoo li tsob ntoo rings- feem ntau tshwm nyob ze ntawm qhov chaw ntawm tus ntoo khaub lig- ntu. Qhov no yog qhov qub. Cov txheej txheem foaming, uas suav nrog kev sib xyaw "dub" thiab "dawb" polyurethane Cheebtsam, yog exothermic; cov tub ntxhais tsim hluav taws xob tseem ceeb uas dissipates maj mam, ua rau nws yooj yim rau "core burning" los yog yellowing. Feem ntau, yog tias cov npuas dej tsis sib xws hauv cov xim (lub teeb lossis daj daj) thiab dawb los ntawm blackening los yog tsis kaj siab tsw, nws yog tsim nyog; me ntsis yellowing muaj me ntsis cuam tshuam rau kev ua haujlwm. Txawm li cas los xij, yog tias cov npuas dej hloov xim daj lossis xim dub, kev ceeb toom tau lees paub. Qee qhov qis- tus nqi "dub" yog tsim los ntawm kev sib xyaw hauv TDI los ntawm - cov khoom los txiav nqi; Cov ua npuas ncauj polyurethane ua npuas ncauj feem ntau tshwm tsaus nti los yog sib sib zog nqus daj, ua nkig, thiab muaj kev cuam tshuam rau kev nqus dej thiab kev laus thaum lub sijhawm ua haujlwm ntev, ua rau kev poob qis hauv kev ua haujlwm. Ib yam li ntawd, siv cov khoom "dawb" tas sij hawm lossis siv cov khoom siv rov ua dua tshiab tuaj yeem ua rau cov xim ua npuas ncauj txawv txav, txo qhov kaw-cov ntsiab lus ntawm tes, thiab qhov tsis zoo ntawm qhov tsis zoo.
Polyurethane kuj tseem muaj kev laus zuj zus thaum lub sij hawm ntev -lub sij hawm siab - kub ua haujlwm. Raws li kev pab cuam lub neej txuas ntxiv, qhov sib xyaw ua ke ntawm qhov kub thiab txias thiab thermal aging ua rau cov npuas dej tsaus thaum txo nws lub zog thiab thermal rwb thaiv tsev efficiency. Nyob rau hauv luv luv, ua npuas ncauj discoloration tuaj yeem yog ib qho teeb meem ncaj qha ntawm cov khoom siv tsis zoo los yog qhov qhia tias cov raj xa dej muaj kev laus.
Yog li, yog tias tsis xim, koj yuav tsum saib dab tsi? Txhawm rau ntsuas qhov zoo ntawm polyurethane ua npuas ncauj, tsom rau nws qhov ntom ntom, kaw -cov ntsiab lus ntawm tes, thiab thermal conductivity. Raws li tus qauv GB / T 29047, qhov ua npuas ncauj ntom ntom yuav tsum tsis pub tsawg tshaj 60 kg / m³, thermal conductivity ntawm 50℃yuav tsum tsis pub tshaj 0.033 W / (m·K), thiab kaw -cov ntsiab lus ntawm tes yuav tsum yog tsawg kawg yog 88%. Failure to meet density standards, an excessively low closed-cell content, and an overly high thermal conductivity are the factors that directly compromise thermal insulation performance and pipeline service life. Thaum yuav khoom, kuaj cov ntaub ntawv rau cov npuas dej yog qhov qhia tau zoo dua li nws cov xim.