Kev faib tawm ntawm Polyurethane Prepolymer

Raws li cov tshuaj tiv thaiv ntawm cov pab pawg kawg, polyurethane prepolymers tuaj yeem muab faib ua: isocyanate terminated prepolymers, hydroxyl terminated prepolymers, prepolymers uas muaj pawg thaiv, thiab polyurethane prepolymers uas muaj lwm pawg xws li silyl terminated thiab alkyl acrylate terminated.
Prepolymers nrog NCO kawg pab pawg qee zaum hu ua hloov pauv polyisocyanates, uas muaj cov yam ntxwv ntawm cov tshuaj tiv thaiv siab, yooj yim cuam tshuam los ntawm ya raws, thiab muaj lub sijhawm cia luv luv; Prepolymers nrog OH pawg davhlau ya nyob twg yog hu ua hydroxyl terminated prepolymers, uas muaj qhov nruab nrab cov tshuaj tiv thaiv thiab lub neej cia ntev, thiab feem ntau yog siv los ua tus neeg sawv cev tseem ceeb rau cov nplaum. Lub blocked polyurethane prepolymer yog npaj los ntawm reacting ib tug blocking neeg sawv cev uas muaj active hydrogen nrog NCO pawg los tiv thaiv cov dawb NCO pab pawg nyob rau hauv lub prepolymer. Cov txheej los yog cov nplaum uas tau npaj los ntawm hom prepolymer no yog tso tawm los ntawm tshav kub tom qab kev tsim kho, uas ua rau kev tsim kho ntawm NCO pab pawg, uas koom nrog cov tshuaj tiv thaiv crosslinking thiab ua kom lub cev muaj zog.