Kev ntim khoom yooj yim yog feem ntau raws li urethane thiab acrylic chemistry. Backbone xaiv tsim tshwj xeeb kev ua tau zoo. Cov kev hloov pauv hauv cov ntsiab lus txiav txim siab seb nws yuav yogsolvent los yog solventless nplaum.
Kev ntim khoom yooj yim rau cov khoom noj thiab lwm yam khoom siv tau nyob ib puag ncig ntev thiab tam sim no yog qhov tseem ceeb rau kev faib khoom, kev tiv thaiv thiab kev lag luam. Niaj hnub no lub ntim tsis tuaj yeem muaj nyob hauv nws cov ntaub ntawv ntau yam thiab kev ua haujlwm yam tsis muaj, ntawm ntau lwm yam, qhov tseem ceeb ua si los ntawmsaj zawg zog ntim adhesives.
Muaj ntau isocyanates muaj nyob rau hauv kev lag luam siv, tab sis tsuas yog tus lej tsawg tau pom zoo los ntawm kev cai lij choj zaub mov muaj txiaj ntsig zoo rau kev ntim cov nplaum. Ob chav kawm ntawm isocyanates yog aromatic thiab aliphatic.Aromatic isocyanatesyog sai reacting, nyob ntawm lawv cov qauv tshuaj. Nyob rau hauv chav kawm aliphatic, ib txwm muaj xws li isophorone diisocyanate, thiab hexamethylene diisocyanate, lwm yam khoom siv aliphatic yog siv rau kev siv nplaum tshwj xeeb.
Covaliphatic isocyanates muaj nqi ntau dua li aromatic. Lawv coj txawv, feem ntau tshwj xeeb thiab muaj kev nyab xeeb chemistry rau siab ntim ntim. Hauv qee daim ntawv thov, tsuas yog aliphatic isocyanate tau tso cai los ntawm kev cai lij choj zaub mov.
