Classification Thiab Preparation Technology Ntawm Polyurethane Prepolymer
Apr 10, 2021
Prepolymer synthesis method Cov feem ntau siv polyurethane prepolymer yog NCO-terminated polyurethane prepolymer.
Txoj kev dav dav rau kev npaj NCO-terminated prepolymers yog: thawj zaug tshem tawm me me ntawm cov dej uas muaj nyob rau hauv oligomer polyols (polyether polyols lossis polyester polyols, thiab lwm yam), thiab tom qab ntawd nyob rau hauv ib qho chaw nitrogen, thaum nplawm lub oligomer polyol yog ntxiv dropwise rau lub tshaj polyisocyanate, thiab cov cua kub uas tsim los ntawm cov tshuaj tiv thaiv raug tshem tawm nyob rau hauv lub sij hawm, kom cov tshuaj tiv thaiv kub yog tswj nyob rau hauv ib tug tej yam kev txwv.
Qee zaum raws li qhov xav tau ntawm cov tshuaj tiv thaiv, cov kuab tshuaj tsim nyog tuaj yeem muab ntxiv los kho cov viscosity ntawm lub cev, thiab cov catalyst tuaj yeem ntxiv los tswj qhov ceev ntawm cov tshuaj tiv thaiv prepolymerization.
