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Preparation method of waterborne polyurethane capable of selfreparing

A water-based polyurethane, self-repairing technology, applied in the field of water-based polyurethane synthesis, to achieve good repairing effect, environmental friendliness, mild self-repairing conditions

Inactive Publication Date: 2016-08-24
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, no research has been reported on the self-healing of waterborne polyurethanes utilizing disulfide bonds

Method used

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  • Preparation method of waterborne polyurethane capable of selfreparing
  • Preparation method of waterborne polyurethane capable of selfreparing

Examples

Experimental program
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Effect test

Embodiment 1

[0029]Add 20g of polycaprolactone diol (molecular weight 1000), 1.788g of dimethylolpropionic acid dissolved in methylpyrrolidone into a three-necked flask, heat up to 120°C, vacuumize and keep the vacuum of the reaction system at Above 0.08MPa, after dehydration for 2 hours, the temperature drops to 80°C, add 9.78g of isophorone diisocyanate, stir and react for 1.5 hours under the protection of nitrogen, then the temperature drops to 50°C, and add methyl ethyl ketone to adjust the viscosity, add 1.028g Two (2-hydroxyethyl) disulfides and 0.03g dibutyltin dilaurate continued to react for 1 hour, then the temperature was lowered to 35°C, and 1.349g triethylamine was added for neutralization for 0.5 hour, then the temperature was lowered to room temperature. Add 80g of deionized water to emulsify and disperse under the condition that the speed of the agitator is 1500r / min, then add 0.240g of ethylenediamine, continue to stir and react for 1 hour, and finally, remove the low boili...

Embodiment 2

[0033] Add 20g of polycaprolactone diol (molecular weight 1000), 1.610g of dimethylolpropionic acid dissolved in methylpyrrolidone into a three-necked flask, heat up to 120°C, vacuumize and keep the vacuum of the reaction system at Above 0.08MPa, after dehydration for 2 hours, the temperature drops to 80°C, add 9.78g of isophorone diisocyanate, stir and react for 1.5 hours under the protection of nitrogen, then the temperature drops to 50°C, and add butanone to adjust the viscosity, add 1.234g Two (2-hydroxyethyl) disulfide and 0.03g dibutyltin dilaurate continued to react for 1 hour, then the temperature dropped to 35°C, and 1.2143g triethylamine was added for neutralization for 0.5 hour, then the temperature was dropped to room temperature, Add 79.5g of deionized water under the condition of 1500r / min rotating speed of the agitator to stir and emulsify and disperse, then add 0.2404g of ethylenediamine, continue to stir and react for 1 hour, and finally, remove the low boiling...

Embodiment 3

[0036] Add 20g of polycaprolactone diol (molecular weight 1000), 1.341g of dimethylolpropionic acid dissolved in methylpyrrolidone into a three-necked flask, heat up to 120°C, vacuumize and keep the vacuum of the reaction system at Above 0.08MPa, after dehydration for 2 hours, the temperature drops to 80°C, add 9.78g of isophorone diisocyanate, stir and react for 1.5 hours under the protection of nitrogen, then the temperature drops to 50°C, and add butanone to adjust the viscosity, add 1.543g Two (2-hydroxyethyl) disulfides and 0.03g dibutyltin dilaurate continued to react for 1 hour, then the temperature was lowered to 35°C, and 1.012g triethylamine was added for neutralization for 0.5 hour, then the temperature was lowered to room temperature. Add 79g of deionized water to stir emulsification and disperse at the speed of the agitator at 1500r / min, then add 0.2404g of ethylenediamine, continue to stir and react for 1 hour, and finally, remove the low boiling point solvent but...

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Abstract

The invention relates to a preparation method of waterborne polyurethane capable of selfreparing. The preparation method includes the steps that hydrophilic chain extender is added to dihydric alcohol, heating for dehydration is conducted under a vacuum condition, the mixture is cooled to 70-85 DEG C, diisocyanate is added, stirring is conducted for a reaction, then the temperature is cooled to 50-55 DEG C, butanone is added, then a catalyst and the chain extender containing disulfide bonds are added, a reaction is conducted for 0.5-3 hours, then the temperature is cooled to 30-35 DEG C, neutralizer is added, then the mixture is cooled to 20-25 DEG C, distilled water is added, the mixture is stirred till emulsion and dispersion are achieved, ethidene diamine is added, chain extension is conducted for 0.5-1 hour, the butanone is removed, vacuum defomaing is conducted, and waterborne polyurethane capable of being self-repaired is obtained. The waterborne polyurethane prepared through the method can be self-repaired under the heating condition, the required condition is mild, the repairing effect is good, emulsion dispersion stability is good, operation is simple, and environmental friendliness is good.

Description

technical field [0001] The invention belongs to the technical field of waterborne polyurethane synthesis, in particular to a preparation method of self-repairable waterborne polyurethane. Background technique [0002] Compared with solvent-based polyurethane, water-based polyurethane replaces organic solvent with water, which is an environmentally friendly polyurethane. However, it will age or crack due to external factors such as force, light, and heat during use, thereby reducing the cost of water-based polyurethane. The basic performance and service life of the material increase the cost of maintenance and replacement. If the material can self-repair and restore the performance before damage after being damaged, this will increase its durability and safety. Therefore, the research on self-healing waterborne polyurethane has far-reaching significance for the development of polyurethane materials. [0003] At present, the research on self-healing polyurethane mainly focuse...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/34C08G18/32C08J5/18C08L75/06
CPCC08G18/3228C08G18/348C08G18/3863C08G18/4277C08G18/6659C08J5/18C08J2375/06C08L75/06C08L2201/54C08L2203/16
Inventor 陈大俊万婷
Owner DONGHUA UNIV
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