Pooyurethane dispersion in alcohol-water system
A polyurethane dispersion, dispersion technology, applied in the direction of polyurea/polyurethane adhesive, body powder, skin care preparations, etc., can solve the problems of unproposed utilization, etc., and achieve the effect of improving hydrolytic stability
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Embodiment 1 to 3
[0104] Examples 1 to 3 show how changing the ethanol-water ratio of the polyurethane dispersion changes the molecular weight, and thus the peel adhesion value.
[0105] The following components were added to a 1 liter reactor to make each batch 600 grams: 120.6 grams (1.09 NCO equiv.) isophorone diisocyanate; 147.6 grams (0.089 OH equiv.) KRATON L-2203 hydrogenated polybutadiene diol (OH Equivalent weight 1660) from Shell Chemical Co., Houston, TX, USA; 296.4 grams (0.291 OH equiv.) TERATHANE 2000 polytetrahydrofurandiol (OH equiv. weight 1020) from E I. du Pont Co., Wilmington, DE, USA ; 6 grams (0.05 OH equivalents) of SURFYNOL 104 surfactant, a diol (OH equivalent weight 113.2) from Air Products, Lehigh Valley, PA, USA; and 24 grams (0.110 equivalents) of the sulfopolyester prepared above Diol A. The opaque mixture was heated to about 80°C with stirring under nitrogen and 0.5 grams of dibutyltin dilaurate catalyst was added. An exothermic reaction occurred and the tempera...
Embodiment 4 to 8
[0110] Examples 4 to 8 show how varying the weight ratio of chain extender to chain stopper affects the molecular weight of the polyurethane dispersion.
[0111] Following the procedure used in Example 1, combine 78.8 g (47.5 meq OH) KRATON L-2203 diol, 157.6 g (154.5 meq OH) TERATHANE 2000 diol, 12.0 g (40 meq OH) sulfonic acid prepared above Base polyester diol B, and 51.5 grams (464.3 meq NCO) of isophorone diisocyanate were added to a 500 mL reactor, heated and stirred to approximately 80°C under nitrogen. About two drops of dioctyltin dilaurate were added and an exothermic reaction occurred to about 87°C. After the reaction had proceeded for approximately 2.5 hours, the mixture was cooled slightly and a 30-gram aliquot (with 22.2 milliequivalents of theoretical unreacted NCO) was charged to ethylenediamine (EDA, 45 grams of 85:15 ethanol to water in water) chain extender) and 2-amino-2-methyl-1-propanol (AMP, chain stopper) in various ratios in 100 mL vials. The mixture...
Embodiment 9 and 10
[0115] Following the procedure used in Example 1, 46.7 g (28.1 meq OH) KRATON L-2203 diol, 93.3 g (91.5 meq OH) TERATHANE 2000 diol, 20.0 g (66.7 meq OH) the sulfonic acid prepared above Base polyester diol B, and 40 grams (360.4 meq NCO) of isophorone diisocyanate were added to a 500 mL reactor, heated and stirred to approximately 80°C under nitrogen. One drop of dioctyltin dilaurate was added and an exothermic reaction occurred to about 82°C. After the reaction had proceeded for approximately 2 hours, the mixture was cooled slightly and a 30-gram aliquot (with 26.1 milliequivalents of theoretical unreacted NCO) was charged to 0.81 grams or 0.65 grams containing 45 grams of 85:15 ethanol and water in water (27 meq) EDA and 0.48 g (5.4 meq) AMP in a 100 mL vial. Homogenize the mixture using an Omni Macro homogenizer.
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