Vim Li Cas Lub Khob Xeem Yuav Tsum Tau Ua Rau Cov Khoom Siv Polyurethane Prepolymer?

1. Saib xyuas qhov piv ntawm A thiab B cov ntaub ntawv

Thaum qhov piv ntawm A thiab B cov ntaub ntawv tawm ntawm qhov sib npaug, lub zog tsim kua muag ntawm cov ntaub ntawv ua npuas dawb yog tshwj xeeb yog yooj yim los soj ntsuam. Lub sijhawm no, nce lossis txo me ntsis A, B cov khoom thiab tom qab ntawd ua tiav lub khob ntsuas, thiab lwm yam, kom txog rau thaum qhov nruab nrab ntawm qhov sib piv ntawm ob pom. Tab sis qee zaum nws yuav nyuaj rau nrhiav qhov chaw sib txuam. Nws tuaj yeem tshwm sim los ntawm kev sib xyaw tsis sib xws, xau ntawm methylene chloride (cov kua dej huv), overheating thiab overcooling ntawm ambient kub. Nyob rau lub sijhawm no, cais ntsuas qhov sib txawv ntawm cov khoom siv A thiab B los txiav txim seb qhov sib piv ntawm A thiab B cov ntaub ntawv yog qhov qub. Nws yuav tsum raug sau tseg tias yog tias cov khoom siv raw tiv thaiv ntev dhau lawm, tus nqi nruab nrab ntawm qhov sib piv ntawm polyurethane prepolymer tsis yog tus nqi ntawm tus qauv piv. Feem ntau, cov khoom siv B yuav nce ntxiv, thiab qhov chaw faib khoom yuav tsum tau tshawb nrhiav dua.

2. Kev kuaj pom ntawm foaming ceev

Txawm hais tias qhov dawb foaming ceev yog raws li tus qauv dawb foaming ceev yog ib qho tseem ceeb qhia los saib seb cov tshuaj tiv thaiv reactivity ntawm cov tshuaj hauv Tshuag yog qhov qub. Siab dhau los yog qis dhau qhia tias cov tshuaj tiv thaiv tsis ua haujlwm li qub, thiab cov gel thiab foaming ceev tsis sib haum xeeb. Qhov txawv ntawm cov dawb ua npuas ncauj ceev thiab cov kev ceev ntawm cov khoom tiav tsis tau heev me me, txwv tsis pub, yog hais tias tus npuas siab yog heev me me, tus nto zoo tshaj ntawm cov khoom tiav yuav deteriorate. Nyob rau hauv qhov tseeb ntau lawm, vim hais tias lub foaming siab me me dhau lawm, qhov zoo ntawm cov khoom tiav yuav deteriorate. Hauv kev tsim khoom ntawm polyurethane prepolymer, tsis txaus luam ntawv foaming siab ua rau muaj teeb meem. Piv txwv li, feem ntau siv PU ib qho khoom lag luam tshuaj feem ntau muaj tus qauv dawb foaming ceev txog li 0.25kg / cm3. Qhov ceev ntawm cov khoom tiav yog 0.5 ~ 0.7g / cm3, thiab qhov sib txawv yog ntau tshaj 0.25kg / cm3. Yog tias qhov ntom ntawm cov khoom tiav raug txo kom txog li 0.4g / cm3 thiaj li txuag tau cov ntaub ntawv, ua rau qhov sib txawv ntawm ob qhov qis dua 0.15g / cm3, qhov zoo ntawm PU ib leeg ntawm qhov chaw tsim khoom yuav tsis zoo.

3. Xyuas cov nplooj nplooj kom muaj npuas

Qee lub sij hawm, thaum sib tov ntawm cov khoom A thiab B yog poured qhuav, cua npuas tau coj mus rau hauv nws. Qhov no tuaj yeem tshwm sim los ntawm kev sib khi tsis zoo ntawm lub tshuab taub hau thiab kev sib khi tsis zoo ntawm cov tshuaj tsuag polyurethane prepolymer. Yog li ntawd, nws tuaj yeem pom los ntawm tus kheej ua npuas ncauj. Thaum lub taub hau sib xyaw tshiab tsuas yog hloov pauv, npuas yuav tshwm sim hauv thawj ob peb khob, tab sis tom qab ob peb khob ntxiv ntawm kev sim. Txij li thaum lub hauv paus ntawm cov xau tau raug kaw los ntawm cov kua sib xyaw, qhov xwm txheej yuav zoo dua.

4. Tshawb xyuas cov ntsuas theem hauv cov txheej txheem foaming tsis siv neeg

Lub reactivity Performance index ntawm qhov tsis siv neeg ua npuas ncauj kuaj, ntxiv rau lub zog Performance index, muaj mis nyuj dawb lub sij hawm, sawv, lub sij hawm tsis lo, thiab elastic lub sij hawm. Xyuas cov sij hawm muaj nqis.