Synthetic method of castor oil based enclosed type waterborne polyurethane
A water-based polyurethane, castor oil-based technology, used in polyurea/polyurethane coatings, coatings, etc., can solve problems such as environmental pollution and resource waste, and achieve excellent performance, low VOC content, tensile strength and elongation at break. Good results
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Embodiment 1
[0024] Put the metered castor oil, PEG1000 and DMPA into a four-necked flask with a stirring and heating device, and after vacuum dehydration at 100°C for 1 hour, add metered NMP (after drying, the moisture content is within 0.05%) and TDI- 80 ([NCO] / [OH]=1.5) was reacted at 80° C. for 2 h under nitrogen protection until the NCO content reached the theoretical value to obtain a polyurethane (PU) prepolymer with a mass concentration of 50% NCO groups; continue to add Measured MEKO reaction, react at 80°C for 2h to obtain blocked polyurethane prepolymer (BPU); add triethylamine at 60°C for neutralization reaction for 0.5h, then add deionized water under stirring at a speed of 4000r / min Disperse to obtain a blocked polyurethane aqueous dispersion (BPUD) with a solid content of 30%.
Embodiment 2
[0026] Put the metered castor oil, PEG2000 and DMPA into a four-necked flask with a stirring and heating device, and after vacuum dehydration at 100°C for 1 hour, add metered NMP (after drying, the moisture content is within 0.05%) and heated Melted pure MDI ([NCO] / [OH]=1.5) was reacted at 75° C. for 3 h under nitrogen protection until its NCO content reached the theoretical value to obtain a polyurethane (PU) prepolymer with a mass concentration of 60% NCO groups ;Continue to add metered MEKO reaction, react at 75°C for 3h to obtain a blocked polyurethane prepolymer (BPU); add triethylamine at 55°C for neutralization reaction for 1h, then add it under stirring at a speed of 8000r / min Disperse with ionized water to obtain a blocked polyurethane aqueous dispersion (BPUD) with a solid content of 20%.
Embodiment 3
[0028] Put the metered castor oil, PEG1000, PEG2000 and DMPA into a four-necked flask with a stirring and heating device, and after vacuum dehydration at 100°C for 1 hour, add metered NMP (after drying, the moisture content is within 0.05%) and IPDI ([NCO] / [OH]=1.5) was reacted at 85° C. for 2 h under nitrogen protection until its NCO content reached the theoretical value to obtain a polyurethane (PU) prepolymer with a mass concentration of 70% NCO groups; continue to add Measured MEKO reaction, react at 85°C for 2h to obtain blocked polyurethane prepolymer (BPU); add triethylamine at 65°C for neutralization reaction for 0.5h, then add deionized water under stirring at a speed of 6000r / min Disperse to obtain a blocked polyurethane aqueous dispersion (BPUD) with a solid content of 40%.
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