Study on preparation and properties of solvent-free two-components PU adhesive modified by organic-silicone
With polyether diol(DL-1000) ,MDI(4,4'-diphenyl methane diisocyanate) as main raw materials, a PU(polyurethane) prepolymer with -NCO-tenninal group was prepared. Then a solvent-free two-components PU adhesive modified by organic-silicone was made with KH-550 as modifier of block copolymer and MOCA/castor oil as composite curing agent. The research results showed that the silane-bond was introduced into PU adhesives. The adhesives with different properties requirements could be made by regulating different KH-550 contents because the viscosity and thermal stability of adhesive were increased,but the curing time and shear strength at room temperature of adhesive were decreased with increasing KH-550 contents. The adhesive had reversely better cold resistance because its glass transition temperature(-45.9 ℃) was reversely lower.
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