Thovu la polyurethane ndi chinthu chofunikira kwambiri m'mapanelo a sandwich, zomwe zimapereka kutchinjiriza kwabwino, kukhazikika kwa kapangidwe kake komanso kugwiritsa ntchito bwino kutentha. Mapanelo a sandwich nthawi zambiri amagwiritsidwa ntchito pomanga nyumba, malo osungiramo zinthu zozizira komanso nyumba zamafakitale, ndipo amakhala ndi zigawo ziwiri zoonda za zinthu zolimba komanso thovu la polyurethane lopepuka. Thovu la polyurethane limapangidwa ndi thovu lolimba la polyurethane ndipo limathandiza kwambiri pakugwira ntchito kwa panelo lonse pankhani ya kutchinjiriza kutentha, kuteteza moto komanso kulimba kwa kapangidwe kake. Ubwino wa thovu la polyurethane umadalira kwambiri chothandizira cha polyurethane chomwe chimagwiritsidwa ntchito popanga.
Ma catalyst a polyurethane amachita gawo lofunikira pakuchitapo kanthu kwa mankhwala komwe kumasintha ma polyol ndi isocyanates kukhala thovu lolimba. Ma catalyst awa amathandizira njira yotulutsa thovu ndi kuchiritsa, kuonetsetsa kuti kapangidwe ka maselo kamakhala kofanana, kumamatira bwino komanso kukhala ndi makhalidwe abwino kwambiri. Chimodzi mwa zinthuzi ndiMXC-15, yankho la potassium octoate (CAS 3164-85-0), lomwe ndi chothandizira cha isocyanurate chosinthika kwambiri komanso chotsika mtengo. Ndiloyenera makamaka popanga ma polyol okhala ndi viscosity yambiri ndipo lingathandize kwambiri kuti isocyanate ichitike.
Kugwiritsa Ntchito mu Sandwich Panels
Chitoliro cha thovu cha polyurethane m'ma sandwich panels chiyenera kukwaniritsa zofunikira zina kuti chitsimikizire kuti chigawocho chikugwira ntchito bwino. Mwachitsanzo, thovu liyenera kukhala lopepuka koma lolimba mokwanira kuti lipirire mphamvu zopanikizika komanso kupereka kutentha koteteza kutentha. Kuphatikiza apo, pazinthu zina, monga kusungirako ozizira kapena kuzizira m'mafakitale, kukana moto ndikofunikira kwambiri.MXC-15Ndi yogwira ntchito kwambiri ndipo imathandiza kupanga thovu la polyisocyanurate (PIR), lodziwika bwino chifukwa cha kukana kwawo moto, zomwe zimapangitsa kuti likhale labwino kwambiri pakugwiritsa ntchito zinthu zotere.
Ma foam a PIR ali ndi ma bond ambiri a isocyanurate kuposa ma foam a polyurethane, zomwe zimawapatsa mphamvu yolimbana ndi moto. MXC-15 imalimbikitsa kupangidwa kwa ma bond awa, kuonetsetsa kuti thovu lomaliza lili ndi mphamvu zofunikira pama panel a sandwich. Izi zimapangitsa kuti makina a foam a PIR omwe amathandizidwa ndi MXC-15 akhale chisankho chodziwika bwino pama panel omwe amafunika kutsatira miyezo yokhwima ya moto.
Zotsatira pa Ubwino wa Zinthu
Kusankha chothandizira kumakhudza kwambiri ubwino wa thovu la sandwich panel. Ma catalyst monga MXC-15 amatsimikizira kuti thovu limayenda bwino komanso molamulidwa, zomwe zimapangitsa kuti thovu likhale lofanana. Izi ndizofunikira kwambiri popanga ma sandwich panel, chifukwa kufanana kwa kuchuluka kwa thovu ndi kukula kwa maselo kumakhudza mphamvu ya kutentha ndi mphamvu ya makina ya sandwich panel. Thovu la polyurethane lopangidwa bwino lolumikizidwa ndi ma catalyst oyenera lingathe kuchepetsa kwambiri kusamutsa kutentha, kukonza mphamvu ya kutchinjiriza komanso kulimba kwa nthawi yayitali kwa ma sandwich panel.
Kuphatikiza apo, kugwiritsa ntchito ma catalyst ogwira ntchito kwambiri monga MXC-15 kungapangitse thovu lolimba lopanda zolakwika zambiri. Kukwera kolamulidwa ndi mawonekedwe a gelation kumachepetsa mwayi wa voids kapena malo ofooka mu thovu, kuonetsetsa kuti kapangidwe kake ka sandwich panel ndi kolimba. Kuphatikiza apo, MXC-15 ndi yoyenera ma polyol formulations okwera kwambiri, kuonetsetsa kuti ikugwirizana ndi mitundu yosiyanasiyana ya ma formula, zomwe zimapangitsa kuti ikhale chisankho chosiyanasiyana kwa opanga omwe akufuna kukonza njira zawo zopangira ma panel.
Mwachidule, ma catalyst a polyurethane monga MXC-15 amachita gawo lofunika kwambiri popanga ma sandwich panel, makamaka popanga ma PIR thovu cores. Mphamvu yawo pa ubwino wa thovu, kutentha komanso kukana moto sizingapeputsidwe. Posankha catalyst yoyenera, opanga amatha kupanga ma sandwich panel omwe amakwaniritsa miyezo yapamwamba komanso chitetezo, zomwe zimapangitsa kuti akhale osankhidwa kwambiri pa ntchito zosiyanasiyana zomanga ndi mafakitale.
Nthawi yotumizira: Januwale-06-2025