Water-based polyurethane emulsion, its mfg. method and use
A water-based polyurethane and emulsion technology, applied in polyurea/polyurethane coatings, applications, latex paints, etc., can solve the problems of inability to disperse in water, high viscosity of isocyanate-terminated prepolymers, and achieve good resolvability
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Synthetic example 1
[0067] Add 863g HDI, 137g MPEG-1, 0.2g zirconium 2-ethylhexanoate into a 1L reactor with a stirrer, thermometer, cooler and nitrogen conduit, and react at 90°C for 2 hours. Next, 0.1 g of phosphoric acid was added, and the termination reaction was performed at a temperature of 50° C. for 1 hour. The isocyanate content of the reaction product after the termination of the reaction was 40.2%. Thin film distillation was performed on the reaction product under the condition of 130° C.×0.04 kPa to obtain allophanate-modified polyisocyanate isocyanate ALP-1.
[0068] The isocyanate content of ALP-1 is 11.4%, the viscosity at 25° C. is 140 mPa·s, and the free diisocyanate content is 0.1%. And, using FT-IR and 13 The ALP-1 was analyzed by C-NMR, and the absence of urethane groups and isocyanurate groups was basically confirmed, and the presence of allophanate groups was confirmed.
Synthetic example 2
[0070] Add 782.6g HDI, 217.4g MPEG-2, 0.2g zirconium 2-ethylhexanoate into a 1L reactor equipped with a stirrer, thermometer, cooler and nitrogen conduit, and react at 90°C for 2 hours . Next, 0.1 g of phosphoric acid was added, and the termination reaction was performed at a temperature of 50° C. for 1 hour. The isocyanate content of the reaction product after the termination of the reaction was 36.5%. Thin film distillation was performed on the reaction product under the condition of 130° C.×0.04 kPa to obtain allophanate-modified polyisocyanate isocyanate ALP-2.
[0071] The isocyanate content of ALP-2 is 7.2%, the viscosity at 25° C. is 100 mPa·s, and the free diisocyanate content is 0.1%. And, using FT-IR and 13 ALP-2 was analyzed by C-NMR, and it was confirmed that there were substantially no urethane groups and isocyanurate groups, and the presence of allophanate groups was confirmed.
Synthetic example 3
[0073] Add 200g NMP, 265.6g 2,4-TDI, 534.5g MPEG-2 in a 1L reactor with a stirrer, a thermometer, a cooler and a nitrogen conduit, and carry out aminomethylation at 80°C for 4 hours acidification reaction. The isocyanate content at this time was 9.6%. Next, 0.5 g of PTSM and 0.025 g of zinc acetylacetonate were added and reacted at a temperature of 100° C. for 5 hours to obtain allophanate-modified polyisocyanate ALP-3.
[0074] ALP-3 has a solid content of 80%, an isocyanate content of 6.4%, a viscosity at 25° C. of 50 mPa·s, and a free diisocyanate content of 0.1%. And, using FT-IR and 13 C-NMR analysis of ALP-3 confirmed the absence of urethane groups and the presence of allophanate groups and isocyanurate groups.
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