Technical Aspects ntawm Rigid Foam Polyurethane Field Spraying
Rigid foam polyurethane (PU) rwb thaiv tsev cov ntaub ntawv yog ib tug polymer nrog ib tug repetitive qauv chav tsev ntawm carbamate ntu, tsim los ntawm cov tshuaj tiv thaiv ntawm isocyanate thiab polyol. Vim nws zoo heev thermal rwb thaiv tsev thiab waterproof kev ua tau zoo, nws pom dav siv nyob rau hauv sab nrauv phab ntsa thiab lub ru tsev rwb thaiv tsev, nrog rau nyob rau hauv txias cia, grain cia chaw, archive chav, pipelines, qhov rooj, qhov rais thiab lwm yam tshwj xeeb thermal rwb thaiv tsev cheeb tsam.
Tam sim no, sib nrug los ntawm kev siv lub ru tsev rwb thaiv tsev thiab kev siv dej tsis zoo, nws tseem ua haujlwm rau ntau lub hom phiaj xws li cov chaw cia txias thiab cov khoom siv tshuaj loj rau nruab nrab.
Lub tshuab tseem ceeb rau kev ua npuas ncauj polyurethane txau siv
Kev txawj ntse ntawm kev ua npuas ncauj polyurethane txau tshuab ua rau muaj teeb meem vim muaj teeb meem xws li ua npuas ncauj tsis sib xws. Nws yog ib qho tseem ceeb los txhim kho kev cob qhia cov neeg ua haujlwm tsim kho kom lawv muaj peev xwm tswj tau cov txheej txheem txau thiab nws tus kheej daws teeb meem kev tsim kho thaum lub sij hawm tsim kho. Cov teeb meem tseem ceeb hauv kev siv tshuaj tsuag yog tsom rau cov hauv qab no:
Tswj lub sij hawm whitening thiab atomization nyhuv.
Kev tsim ntawm polyurethane ua npuas ncauj muaj ob theem: foaming thiab curing.
Los ntawm cov theem sib xyaw kom txog rau thaum qhov nthuav dav ntawm npuas ntim tsis tas - cov txheej txheem no hu ua foaming. Thaum lub sij hawm no, qhov sib xws hauv cov npuas qhov kev faib tawm yuav tsum raug txiav txim siab thaum muaj ntau npaum li cas ntawm reactive kub ester raug tso tawm rau hauv lub cev thaum lub sijhawm ua haujlwm. Bubble uniformity feem ntau nyob ntawm yam xws li:
1. Cov khoom sib txawv ntawm qhov sib txawv
Muaj qhov sib txawv tseem ceeb ntawm qhov sib txawv ntawm cov tshuab tsim npuas piv rau cov khoom tsim los ntawm tes. Feem ntau, cov khoom siv ruaj khov yog 1: 1; Txawm li cas los xij vim qhov sib txawv ntawm cov viscosity sib txawv ntawm cov tuam txhab sib txawv cov khoom siv dawb - cov khoom siv tiag tiag yuav tsis sib haum nrog cov kev sib piv ruaj khov no ua rau muaj qhov tsis sib xws hauv cov npuas ntom ntom raws li kev siv cov khoom siv dawb lossis dub ntau dhau.
2.Ambient kub
Polyurethane foams yog rhiab heev rau qhov kub thiab txias; lawv cov txheej txheem foaming cia siab rau qhov muaj cua sov uas los ntawm ob qho tib si tshuaj lom neeg hauv lub cev nrog rau ib puag ncig kev cai.
Thaum ambient kub siab txaus rau ib puag ncig cua sov muab - nws accelerates cov tshuaj tiv thaiv ceev uas ua rau tag nrho nthuav foams nrog zoo ib yam nto-rau-core densities.
Hloov pauv ntawm qhov kub qis dua (piv txwv li, qis dua 18 ° C), qee cov tshuaj tiv thaiv tshav kub dissipates rau hauv ib puag ncig ua rau lub sijhawm kho ntev ntev nrog rau cov pwm pwm shrinkage ntxiv uas ua rau cov nqi tsim khoom.
3. Cua
Thaum lub sij hawm txau cov haujlwm cua ceev yuav tsum nyob twj ywm qis dua 5m / s; tshaj qhov pib no tshuab tawm cov tshuaj tiv thaiv-tsim cua sov cuam tshuam sai foaming thaum ua cov khoom nto nkig.
4.Base kub & humidity
Lub hauv paus ntawm phab ntsa kub muaj feem cuam tshuam rau polyurethane lub foaming efficiency thaum lub sij hawm daim ntawv thov txheej txheem tshwj xeeb tshaj yog yog hais tias ambient & puag phab ntsa temps yog tsawg - sai sai absorbed tom qab thawj txheej txo tag nrho cov khoom tawm los.
Yog li ntawd txo qis thaum tav su lub sijhawm so thaum lub sijhawm tsim kho nrog rau cov phiaj xwm kev npaj ua haujlwm ua qhov tseem ceeb rau kev ua kom pom qhov ua tau zoo ua npuas ncauj polyurethane nthuav dav.
Rigid Polyurethane Ua Npuas Ncauj sawv cev rau cov khoom siv polymer tsim los ntawm kev cuam tshuam ntawm ob yam khoom - Isocyanate & ua ke Polyether.
Isocyanate Cheebtsam tau nkag siab nrog cov dej tsim cov urea bonds; Kev nce hauv urea daim ntawv cog lus cov ntsiab lus ua rau ua rau foams nkig thaum txo qhov adhesion ntawm lawv & substrates li no yuav tsum tau ntxuav cov substrate kom huv si tsis muaj xeb / plua plav / dej noo / paug tshwj xeeb tshwj xeeb yog zam cov hnub los nag uas muaj dew / Frost muaj yuav tsum tau tshem tawm tom qab ziab ua ntej yuav mus ntxiv.
Post lub sij hawm: Lub Xya hli ntuj-16-2024