Muaj feem cuam tshuam ntawm ntau qhov ntsuas ntawm polyether polyols ntawm cov khoom ua npuas ncauj -Unsaturation thiab ya raws
Qib ntawm cov tshuaj tiv thaiv polyether kub thiab tus naj npawb ntawm cov catalysts ncaj qha cuam tshuam qhov℃ntawm unsaturation ntawm cov khoom polyether. Yog tias cov tshuaj tiv thaiv kub siab lossis cov ntsiab lus catalyst siab (tus naj npawb ntawm cov chaw ua haujlwm ntawm cov saw hlau polyether loj), cov kev cuam tshuam sab nraud nce ntxiv thiab cov℃ntawm unsaturation nce.Qhov nce hauv unsaturation qhia tau tias muaj kev nce hauv cov khoom tsis txaus ntseeg xws li aldehydes generated thaum cov tshuaj tiv thaiv. Tom qab cov pab pawg kawg ntawm polyether tsim ib qho kev tsis txaus ntseeg ob daim ntawv cog lus, qhov rov ua haujlwm poob, thiab kev loj hlob ntawm cov saw hlau raug txiav, uas cuam tshuam rau qhov nruab nrab molecular hnyav ntawm polyether, ua rau qhov nruab nrab molecular hnyav txo, tus nqi hydroxyl nce, thiab kev ua haujlwm ntawm polyether txo qis.Qhov kev ua haujlwm ncaj qha cuam tshuam rau kev ua haujlwm ntawm cov khoom ua npuas ncauj. Yog li ntawd, hauv kev tswj hwm ntau lawm, qhov qis qis ntawm qhov tsis txaus ntseeg, qhov cuam tshuam tsawg dua, thiab qhov cuam tshuam me dua ntawm cov khoom ua npuas ncauj.
Dej raws li tus neeg sawv cev foaming yog ib qho tseem ceeb tshaj plaws hauv kev ua npuas dej. Cov dej me me tuaj yeem haus ntau TDI, tsim cov roj ntau thiab tso cua sov.Qhov kev nce hauv cov dej hauv cov tshuaj tiv thaiv sib tov tuaj yeem ua kom cov tshuaj tiv thaiv ceev ceev.Yog tias cov dej noo hauv cov polyether (uas tsis quav ntsej thaum xam TDI index) nce, tsis tsuas yog yuav tsum tau noj ntau npaum li cas TDI kom txo cov kev ua ntawm polyether, tab sis kuj muaj ntau qhov kev sib tsoo ntawm cov pa roj carbon monoxide. 2 [/ sub] thiab kub hauv cov tshuaj tiv thaiv, qhov ntom ntawm cov khoom ua npuas ncauj yuav raug txo. Yog tias cov cua sov tsim tawm tsis tuaj yeem tshem tawm sai, nws yuav ua rau lub plawv daj thiab txawm tias muaj hluav taws kub heev.Yog tias cov dej noo ntawm polyether tshaj li tus qauv tiag, cov nyiaj ntawm urea daim ntawv cog lus thiab CO [sub] 2 [/sub] yuav raug tsim, cov npuas ntom ntom yuav me dua, cov khoom ua npuas yuav tawv, thiab cov cua kub ntau yuav raug tso tawm tib lub sijhawm, yog tias nws siv tau yooj yim rau cov neeg siv khoom tawg. sib npaug ntawm qhov nce ntawm cov dej, tab sis tus nqi ntawm TDI thiab catalyst tsis tau hloov kho, uas tuaj yeem ua rau foaming tau yooj yim, thiab thaum tus txheej txheem ntau dhau, qhov tshwm sim ntawm foaming yuav tshwm sim.Yog li ntawd, qhov qis dua cov dej noo hauv cov txheej txheem tswj polyether, qhov zoo dua, uas yog qhov zoo rau kev ruaj ntseg ntawm cov qauv thiab kev ua haujlwm ntawm cov khoom ua npuas ncauj.