Binder composition comprising polyaspartic ester and sulfonated polyiscocyanate
A polyisocyanate and sulfonate technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of short pot life, slow drying, long pot life, etc.
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[0026] The preparation of NCO prepolymer iii) can use high molecular weight polyol mixed with low molecular weight polyol, so as to directly produce a mixture of low molecular weight polyisocyanate ii) for urethane-based paint and high molecular weight NCO prepolymer iii) .
[0027] For the preparation of sulfonate-modified polyisocyanates A), the polyisocyanate starting materials i), ii) and / or iii) are optionally reacted with difunctional polyethers, the NCO groups are partially urethane-alkylated, and then combined with Compounds having at least one isocyanate-reactive group, such as an OH or NH group, and at least one sulfonic acid or sulfonate group are reacted. These isocyanate-reactive compounds are preferably 2-(cyclohexylamino)ethanesulfonic acid and / or 3-(cyclohexylamino)propanesulfonic acid. After the polymer has been prepared, the sulfonic acid groups are completely or partially neutralized by adding a base, preferably a tertiary amine.
[0028] The polyisocyanat...
Embodiment
[0074] All percentage data refer to percentages by weight unless otherwise indicated.
[0075]The dynamic viscosity was measured at 23°C with a rotational viscometer (Visco Tester 550, Thermo Haake GmbH, D-76227 Karlsruhe).
[0076] The flow time is determined according to DIN 53211 as a measure of pot life.
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