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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Closed polyurethane is widely used in coatings, adhesives and surface finishing industries. However, organic solvents are mostly used in the synthesis of closed polyurethane, which causes environmental pollution and waste of resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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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.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a synthesis method of castor oil-based blocked waterborne polyurethane. Background technique [0002] Blocked polyurethane is widely used in coatings, adhesives, and surface finishing industries. However, organic solvents are mostly used in the synthesis of blocked polyurethane, which causes environmental pollution and waste of resources. At present, with the widespread attention to environmental and safety issues at home and abroad, the increasing awareness of people's environmental protection and the determination and strengthening of safety and environmental protection regulations in various countries, the application of traditional solvent-based polyurethane is becoming more and more restricted. Water-based polyurethane is characterized by its VOC It will be the general trend to replace solvent-based polyurethane due to its low content and excellent per...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/36C08G18/34C08G18/28C08G18/12C09D175/08
CPCC08G18/6696C08G18/12C08G18/286C08G18/348C08G18/36C08G18/48C08G18/6692C09D175/08
Inventor 刘军宁晓龙念以亭马海晶
Owner SHANDONG INOV NEW MATERIALS CO LTD
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