Method for preparing visible light self-repairing waterborne polyurethane coating material with double selenium bonds on main chain

A water-based polyurethane and visible light technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as no patent reports, reduce safety hazards, have mild self-repair conditions, and increase service life.

Active Publication Date: 2017-03-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no patent report on self-healing polymer materials containing diselenium bonds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The synthesis process of waterborne polyurethane coating materials containing diselenium bonds in the main chain: (1) PPG-1000 was distilled under reduced pressure for 3.0 h at 120 °C and a vacuum of 0.090 MPa to remove water; (2) Added 5.0 g of PPG-1000 that has been dried and dehydrated and 3.35 g of isophorone diisocyanate, add 0.002 g of dibutyltin dilaurate, stir and heat up to 60°C for 5.0 h; (3) add 0.49 g at 120°C, vacuum Dry dimethylolpropionic acid and 1.0 g dihydroxyethyl diselenide under the condition of 0.090 MPa to remove water for 3.0 h, and continue to react for 5.0 h; (4) Cool down to 40°C, add 1.0 g of acetone to adjust the viscosity of the system, and Add 0.37 g of triethylamine to neutralize the reaction for 15 min; (5) Add 19.07 g of deionized water into the reaction vessel, stir rapidly until the system is uniformly dispersed, then add a mixture of 4.77 g of deionized water and 0.046 g of ethylenediamine, and Emulsification and chain extension at 1...

Embodiment 2

[0039] The synthesis process of waterborne polyurethane coating materials containing diselenium bonds in the main chain: (1) Distill PTMEG-1000 under reduced pressure for 2.0 h at 130 °C and a vacuum of 0.086 MPa to remove water; (2) add 5.0 g of PTMEG-1000 that has been dried and dehydrated and 3.27 g of toluene diisocyanate, add 0.002 g of stannous octoate, stir and raise the temperature to 80°C for 3.0 hours; (3) Add 0.49 g at 130°C and a vacuum of 0.086 MPa Dry the dimethylol propionic acid and 1.0 g of dihydroxyethyl diselenide for 2.0 h of water removal, and continue the reaction for 3.0 h; (4) cool down to 20°C, add 1.0 g of butanone to adjust the viscosity of the system, and add 0.37 g of tris Ethylamine was neutralized for 10 min; (5) 19.24 g of deionized water was added to the reaction vessel, and stirred rapidly until the system was uniformly dispersed, then a mixture of 4.81 g of deionized water and 0.218 g of hexamethylenediamine was added, and the mixture was heat...

Embodiment 3

[0041] The synthesis process of waterborne polyurethane coating materials containing diselenium bonds in the main chain: (1) Distill PBA-1000 under reduced pressure for 2.5 h at 120 °C and a vacuum of 0.088 MPa to remove water; (2) add 5.0g of PBA-1000 that has been dried and dehydrated and 4.21g of hexamethylene diisocyanate, add 0.002g of dibutyltin dilaurate, stir and raise the temperature to 90℃ for 2.0h; (3) add 0.49g at 120℃, vacuum Dry dimethylolpropionic acid and 0.96 g dihydroxyethyldiselenide under the condition of 0.088 MPa to remove water for 2.5 h, and continue to react for 2.0 h; (4) Cool down to 30°C, add 1.1 g of acetone to adjust the viscosity of the system, And add 0.37 g triethylamine to neutralize the reaction for 12 min; (5) Add 21.38 g deionized water to the reaction vessel, stir rapidly until the system is uniformly dispersed, then add 5.35 g deionized water and 0.426 g isophoronediamine The mixture was emulsified and chain-extended for 2.0 h at a rotati...

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PUM

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Abstract

The invention discloses a method for preparing a visible light self-repairing waterborne polyurethane coating material with double selenium bonds on a main chain. The method comprises the following steps: firstly, preparing an isocyanate end capped polyurethane prepolymer with double selenium bonds on a main chain from raw materials of diisocyanate, dihydroxyethyl diselenide, macromolecule dihydric alcohol and dimethylolpropionic acid; secondly, adding triethylamine for neutralization, further adding a proper amount of deionized water for rapid emulsification, slowly adding a diamine chain extender which is diluted with water, and performing emulsification chain expansion under a condition that the rotation speed is greater than 1200r/min, thereby obtaining the visible light self-repairing waterborne polyurethane coating material with the double selenium bonds on the main chain. On the basis of the visible light reversibility characteristic of double-selenium dynamic covalent bonds, the waterborne polyurethane coating material with the double selenium bonds on the main chain is capable of achieving self-repairing of cracks and broken parts under radiation of gentle visible illumination, so that the service life of the material can be greatly prolonged, the potential safety hazard in use can be reduced, and a relatively long service life can be achieved for the waterborne polyurethane coating material. The waterborne polyurethane coating material with double selenium bonds on the main chain is applicable to coating of leather, textiles, paper, furniture, wall surfaces and the like, and has wide application prospects.

Description

technical field [0001] The invention relates to a preparation method of water-based polyurethane, specifically, a preparation method of a visible light self-repairing water-based polyurethane coating material whose main chain contains a diselenium bond, and belongs to the fields of polymer synthesis technology and intelligent polymer materials. Background technique [0002] During the use of materials, they will be affected by external factors such as heat, machinery and chemistry, and microcracks will be generated inside them, which will affect their service life and mechanical properties. In order to solve this kind of material damage that is difficult to detect macroscopically, material scientists are inspired by the self-healing process when organisms are damaged, and by imitating the principle of self-healing damage, self-healing materials came into being ( Nature , 2001, 409: 794-817.). Self-healing materials can sense changes in external environmental factors and res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D175/06C08G18/12C08G18/66C08G18/32C08G18/34C08G18/08
CPCC08G18/0823C08G18/12C08G18/348C08G18/3897C08G18/6659C08G18/6692C09D175/06C09D175/08C08G18/3228C08G18/3234
Inventor 金勇樊武厚赖双权尹昕
Owner SICHUAN UNIV
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