Daim ntawv thov ntawm Polyurethane Prepolymer

Polyurethane prepolymers yog dav siv nyob rau hauv polyurethane adhesives, txheej, elastomers, ua npuas ncauj, fibers thiab ntau lwm yam teb.
Adhesive thiab txheej txheej prepolymer thev naus laus zis tau siv dav hauv kev npaj cov txheej txheem ib leeg lossis ob txheej txheej lossis cov nplaum. Polyurethane nplaum tsis tsuas yog muaj kev hloov tau zoo rau qhov chaw ntawm cov nplaum sib txawv, tab sis kuj muaj lub zog cohesive thiab muaj zog ntau. Polyurethane prepolymers tuaj yeem ua cov khoom tseem ceeb ntawm cov nplaum. Raws li cov reactivity ntawm prepolymers, lawv muaj peev xwm muab faib ua peb pawg: ib feem reactive adhesives, ib feem uas tsis reactive adhesives, thiab ob feem reactive adhesives. Ib qho kev tivthaiv reactive adhesives feem ntau siv cov prepolymers uas muaj cov pab pawg NCO lossis cov pab pawg NCO. Prepolymers uas muaj cov pab pawg NCO dawb feem ntau tuaj yeem siv ncaj qha lossis tsim raws li chav tsev kub kho ib qho kev tiv thaiv noo noo kho polyurethane adhesives lossis coatings. Thaum npaj cov prepolymer rau ib qho khoom nplaum, txawm tias nyob rau hauv cov ntaub ntawv ntau lossis cov tshuaj, cov molar ratio ntawm NCO rau OH pawg feem ntau yog tswj kom muaj ntau dua 1 hauv cov saw txuas ntxiv cov tshuaj tiv thaiv ntawm polyester polyols nrog TDI lossis MDI, kom cov ntsiab lus NCO dawb nyob rau hauv cov tshuaj tiv thaiv cov khoom yog tswj ntawm ib theem. NCO raws li prepolymer tuaj yeem siv tau rau ntau qhov chaw xws li cov nplaum, txheej, impregnating agents, thiab lwm yam. Kev sib xyaw polyurethane prepolymer nrog cov khib nyiab roj hmab cov khoom los tsim cov ntaub qhwv elastic rau cov chaw pej xeem xws li kindergartens yog ib qho piv txwv ntawm daim ntawv thov ntawm noo noo kho polyurethane prepolymer. raws li cov roj hmab particle nplaum.