Polyurethane-polyurea dispersions
A dispersion and polyurethane technology, used in polyurea/polyurethane coatings, coatings, transportation and packaging
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[0056] The preparation of the polyurethane prepolymers can be carried out simultaneously with, or subsequently with, the partial or complete salt formation of the anionic and / or cationic dispersing groups, if this reaction has not already taken place in the starting molecule. In the case of anionic groups bases such as tertiary amines such as trialkylamines containing 1 to 12, preferably 1 to 6 carbon atoms per alkyl group may be used for this purpose. Examples of such bases are trimethylamine, triethylamine, methyldiethylamine, tripropylamine, N-methylmorpholine, methyldiisopropylamine, ethyldiisopropylamine and diisopropylethylamine. The alkyl groups may also, for example, carry hydroxyl groups, such as dialkylmonoalkanolamines, alkyldialkanolamines and trialkanolamines. It is also optionally possible to use inorganic bases as neutralizing agents, for example ammonium hydroxide or sodium hydroxide and / or potassium hydroxide. Preference is given to triethylamine, triethanola...
Embodiment 1
[0084] Example 1 : comparative example
[0085] 350.0 g of a difunctional polyester polyol based on adipic acid and 1,6-hexanediol (average molecular weight 1700 g / mol, OHN = about 66 mg KOH / g solid) was heated to 65°C. Subsequently, 60.1 g of 1,6-hexamethylene diisocyanate were added within 5 minutes at 65° C., and the mixture was stirred at 100° C. until a theoretical NCO value of 3.2% was reached. The resulting prepolymer was dissolved in 729.1 g of acetone at 50° C., and then a solution of 3.5 g of ethylenediamine, 22.6 g of disulfamic acid salt and 110.3 g of water was metered in within 5 minutes. This was followed by stirring for 15 minutes. The product was then dispersed by adding 513.0 grams of water over 10 minutes. The solvent was then distilled off in a vacuum to form a storage-stable PUR dispersion with a solids content of 40.1% and a particle size of 169 nm.
Embodiment 2
[0086] Example 2 : embodiment of the invention
[0087] 350.0 grams of difunctional polyester polyols based on adipic acid and monoethylene glycol, 1,4-butanediol and diethylene glycol (the weight ratio of OH components is 27 / 40 / 33, and the average molecular weight is 2000 grams / mol, OHN=about 56) was heated to 65°C. Subsequently, 52.6 g of 1,6-hexamethylene diisocyanate were added at 65° C. within 5 minutes, and the mixture was stirred at 100° C. until a theoretical NCO value of 2.9% was reached. The resulting prepolymer was dissolved in 486.5 g of acetone at 50° C., and then a solution of 3.0 g of ethylenediamine, 19.8 g of disulfamic acid salt and 78.8 g of water was metered in within 5 minutes. This was followed by stirring for 15 minutes. The product was then dispersed by adding 532.2 grams of water within 10 minutes. The solvent was then distilled off in a vacuum to form a storage-stable PUR dispersion with a solids content of 40.0% and a particle size of 171 nm. ...
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