Non-ionically hydrophilised binding-agent disperisions
The present invention relates to aqueous non-ionically hydrophilised binding-agent dispersions based on polyurethane ureas with terminal polyethylene-oxide groups, to the preparation thereof, and to the use thereof for producing coatings.
1. An aqueous polyurethane-urea dispersion consisting of the following structural components:
A) 10 weight % to 40 weight % of one or more aliphatic polyisocyanate compounds;
B) 40 weight % to 70 weight % of at least one polyhydroxy compound with a molar mass M n in the range of from 400 g/mol to 8000 g/mol;
C) 19 weight % to 50 weight % of a monofunctional polyethylene-glycol-containing component which is reactive with respect to isocyanate groups, the polyethylene-glycol content of which component amounts to at least 50 weight % and has a molar mass M n in the range of from 1200 g/mol to 3000 g/mol;
D) 0.5 weight % to 10 weight % of at least one compound selected from the group consisting of ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane, 1,4-diaminobutane, 1,6-diaminohexane, isophoronediamine, isomer mixture of 2,2,4- and 2,4,4-trimethylhexamethylenediamine, 2-methylpentamethylenediamine, diethylenetriamine, 1,3- xylylenediamine, 1,4-xylylenediamine, α,α,α′,α′-tetramethyl-1,3- xylylenediamine, 1,4-xylylenediamine, 4,4-diaminodicyclohexylmethane, dimethylethylenediamine, hydrazine, adipic acid dihydrazide, 3-amino-1-methylaminopropane, 3-amino-1-ethylaminopropane, 3-amino-1-cyclohexylaminopropane, 3-amino-l-methylaminobutane, N-aminoethylethanolamine, ethanolamine, 3-aminopropanol, neopentanolamine, and diethanolamine;
E) 0.5 weight % to 10 weight % of a polyhydroxy compound with a molar mass M n in the range of from 62 g/mol to 320 g/mol and with a functionality of 1 or greater; and
F) 0 weight % to 10 weight % of one or more auxiliary substances or additives selected from the group consisting of anti-oxidants, UV stabilisers, flow-control agents, biocides, anti-static agents, adhesion promoters, or mixtures thereof;
wherein the sum of said structural components A), B), C), D), E), and F) equals 100 weight %.
2. The aqueous polyurethane-urea dispersion of claim 1 , wherein C) is a polyoxyalkylene ether that contains only one hydroxy group or amino group.
3. The aqueous polyurethane-urea dispersion of claim 1 , wherein C) is a polyoxyalkylene ether that contains from 50 weight % to 100 weight % of structural units derived from ethylene oxide.
4. The aqueous polyurethane-urea dispersion of claim 1 , wherein C) is a polyoxyalkylene ether having a molar mass M n in the range of from 1500 g/mol to 3000 g/mol.
5. The aqueous polyurethane-urea dispersion of claim 1 , wherein D) is a compound selected from the group consisting of diethanolamine, hydrazine, isophoronediamine, ethylenediamine, and mixtures thereof.
6. The aqueous polyurethane-urea dispersion of claim 1 , wherein D) is at least two compounds selected from the group consisting of diethanolamine, hydrazine, isophoronediamine, ethylenediamine, and mixtures thereof.
7. The aqueous polyurethane-urea dispersion of claim 1 , wherein D) is a mixture of hydrazine hydrate and isophoronediamine.
8. A coating agent comprising the aqueous polyurethane-polyurea dispersion of claim 1 .
9. A glass-fibre sizing material comprising the aqueous polyurethane-polyurea dispersion of claim 1 .
10. An aqueous coating agent comprising the aqueous polyurethane-polyurea dispersion of claim 1 and a crosslinker selected from the group consisting of water-dispersible blocked polyisocyanates and water-soluble blocked polyisocyanates.