SEALANT COMPOSITION OF DICOMPONENT

摘要

This is new silant composition containing polyurethane prepolymer and free radical scavenger, which has good durability and weather resistance. The composition comprises 10-50 wt.% polyurethane prepolymer of formula (I) as substrate; and 0.01-5.0 wt.% of (II) as free radical scavenger. In the formula, R1 is C6-15 aliphatic or aromatic hydrocarbon; m is integer of 100-1000; n is 0-100. The scavenger lessens the unstability of prepolymer such that durability of silant is enhanced and color change can be protected. Av. Mw of pref. prepolymer is 10000-25000 for building.