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Polyurethane sealants and adhesives represent a global market of more than a million tons per annum. Some 50% of this volume is the polyurethane basis, the rest are fillers and additives. Originally, curing was effected via the isocyanate end-groups but more recently the end-groups have been modified via endcapping reactions with e.g. amino alkoxy silanes (Reaction 2) to yield silylated polyurethane prepolymers (SPU). These prepolymers combine the advantages of polyurethane (They can be painted and exhibit excellent adhesion to a variety of substrates and they have exceptional mechanical properties.) and silicons.[15,16] From our studies[13] of the reaction of polyols having various molar masses (from 2000 to 12000g·mol-1) with several diisocyanates (Isophorone diisocyanate (IPDI), toluene diisocyanate (TDI), diphenyl methane diisocyanate (MDI)) in the presence of typical commercial catalysts we could show that the SDR is not just an alternative to a batch STR used in industry but it has several important advantages. (1) (2) Table 1. A Comparison of some Key Properties of a reactive Polyurethane Produced in a Batch Reactor- and a SDR Residual NCO Residual Monomer Viscosity Goal 4.51% Minimum 6000 mPas Batch 4.15% 3.5% 6500 mPas SDR 4.49% 2.1% 6250 mPas Table 1[13] lists some key results from the reaction of a polyol with Mn = 2000 g mol-1 with excess IPDI (m < n, Reaction 1) in a technical STR and in a SDR as well as the target numbers. 6PDF Image | Spinning Disk Reactor for Polymers and Nanoparticles
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