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

Inactive Publication Date: 2016-04-20
SHANDONG INOV NEW MATERIALS CO LTD
2 Cites 11 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0002] Closed polyurethane is widely used in coatings, adhesives and surface finishing industries. However, organic solve...
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Abstract

The invention belongs to the technical field of chemical synthesis, and particularly relates to a synthetic method of castor oil based enclosed type waterborne polyurethane. The synthetic method comprises steps as follows: castor oil, polyethylene glycol and a hydrophilic chain extender are adopted to react with diisocyanate in a hydrophilic solvent, and a polyurethane prepolymer with a terminal NCO group is obtained; a sealing agent is adopted to be in an end capping reaction with the prepolymer, and an enclosed type polyurethane prepolymer is obtained; finally, after the enclosed type polyurethane prepolymer is in a neutralization reaction with a neutralizer, a product is dispersed in deionized water, and castor oil based enclosed type waterborne polyurethane is obtained. The adopted castor oil is an important renewable resource, and enclosed type waterborne polyurethane synthesized with the castor oil as a raw material has the characteristic of high self-crosslinking; a polyurethane coating prepared from the product has better heat resistance, volume resistivity, tensile strength and breaking elongation.

Application Domain

Polyurea/polyurethane coatings

Technology Topic

PrepolymerIon +9

Examples

  • Experimental program(3)

Example Embodiment

[0023] Example 1
[0024] Put the measured castor oil, PEG1000 and DMPA into a four-necked flask equipped with a stirring and heating device, and after vacuum dehydration at 100°C for 1 hour, add measured NMP (after drying, moisture content within 0.05%) and TDI- 80([NCO]/[OH]=1.5) react at 80℃ for 2h under the protection of nitrogen, until the NCO content reaches the theoretical value, obtain the NCO-terminated polyurethane (PU) prepolymer with a mass concentration of 50%; continue adding Metered MEKO reaction, react at 80°C for 2h to obtain a blocked polyurethane prepolymer (BPU); add triethylamine at 60°C to neutralize the reaction for 0.5h, add deionized water under stirring at 4000r/min Dispersion is performed to obtain a closed polyurethane aqueous dispersion (BPUD) with a solid content of 30%.

Example Embodiment

[0025] Example 2
[0026] Put the measured castor oil, PEG2000 and DMPA into a four-necked flask with a stirring and heating device. After dehydration in vacuum at 100°C for 1 hour, add the measured NMP (after drying, the moisture content is within 0.05%) and the heated The molten pure MDI ([NCO]/[OH]=1.5) was reacted at 75°C for 3h under nitrogen protection until its NCO content reached the theoretical value, and a NCO-terminated polyurethane (PU) prepolymer with a mass concentration of 60% was obtained ; Continue to add metered MEKO reaction and react at 75°C for 3h to obtain a closed polyurethane prepolymer (BPU); add triethylamine at 55°C to neutralize the reaction for 1h, then add it under stirring at 8000r/min Ionized water is used for dispersion to obtain a closed polyurethane aqueous dispersion (BPUD) with a solid content of 20%.

Example Embodiment

[0027] Example 3
[0028] Put the measured 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 a measured amount of NMP (after drying, the moisture content is within 0.05%) and IPDI ([NCO]/[OH]=1.5) reacted at 85℃ for 2h under the protection of nitrogen, until its NCO content reached the theoretical value, and the NCO-terminated polyurethane (PU) prepolymer with a mass concentration of 70% was obtained; continue adding Metered MEKO reaction, react at 85°C for 2h to obtain a blocked polyurethane prepolymer (BPU); add triethylamine at 65°C to neutralize the reaction for 0.5h, add deionized water under stirring at 6000r/min Disperse to obtain a blocked polyurethane aqueous dispersion (BPUD) with a solid content of 40%.

PUM

no PUM

Description & Claims & Application Information

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