초록 ▼

This invention relates to special combinations of polyurethane-urea-forming starting components which are suitable for corrosion-inhibiting wear prevention by casting, centrifugal casting or spraying. Said components are liquid, relatively low viscosity mixtures of polymer-containing or polyadduct-c

This invention relates to special combinations of polyurethane-urea-forming starting components which are suitable for corrosion-inhibiting wear prevention by casting, centrifugal casting or spraying. Said components are liquid, relatively low viscosity mixtures of polymer-containing or polyadduct-containing polypropylene oxide polyols and/or ethylene oxide-containing polypropylene oxide polyols having a small content of special, low-melting, readily soluble aromatic diamines and tertiary amine catalysts as component (A) which are reacted at room temperature with liquid polyisocyanates based on diphenyl methane diisocyanate or their NCO-prepolymers with polyether polyols as components (B).

대표청구항 ▼

A hydrolysis-resistant, low temperature-resistant, elastic polyurethane-urea possessing high strength and abrasion resistance prepared from coldhardening, quick-gelling, solvent-free, liquid components comprising (A) a liquid mixture having a viscosity below about 6,000 mPa.s/25°C. and an average fu

A hydrolysis-resistant, low temperature-resistant, elastic polyurethane-urea possessing high strength and abrasion resistance prepared from coldhardening, quick-gelling, solvent-free, liquid components comprising (A) a liquid mixture having a viscosity below about 6,000 mPa.s/25°C. and an average functionality of the hydroxyl group and amino group compounds of about 2.0 to 2.75 comprising (1) a polyether polyol component having an average molecular weight of about 500 to 8,000 and a viscosity below about 6,000 mPa.s/25°C. which is (a) graft modified with about 5 to 40% by weight of polymers and/or copolymers of unsaturated monomers and/or (b) contains from about 5 to 40% by weight of high molecular weight polyadducts, polycondensates or polymers in dissolved or finely dispersed form; (2) liquid or low melting aromatic polyamines soluble in (1) and having a molecular weight below about 500 wherein the OH/NH2 equivalent ratio of (1) to (2) is from about 1:1 to 1:10; and (3) aliphatic tertiary amine catalysts in quantities from about 0.01 to 5% by weight; and (B) liquid aromatic polyisocyanates having an average isocyanate functionality of from about 2.0 to 2.55 comprising (1) phosgenation products of the condensation reaction of aniline and/or C1-C4-mono- or -di-substituted anilines with formaldehyde or the conversion products of said phosgenation products which are liquid at room temperature and are obtained by the introduction of carbodiimide, allophanate or biuret groups, by trimerization or by modification with low molecular weight polyols, said phosgenation products or said conversion products having a viscosity below about 1000 mPa.s/25°C. and/or (2) reaction products of (B) (1) with a polyether polyol having a molecular weight from about 400 to 7000 at an NCO/OH equivalent ratio of about 2:1 to 10:1, said reaction products having a viscosity below about 5000 mPa.s/25°C., wherein the equivalent ratio of the isocyanate groups of (B) to the isocyanate-reactive groups of (A) is about 0.95:1 to 1.10:1.