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Water-based polyurethane self-repairing coating material based on double-selenium dynamic covalent bond and hydrogen bond

A technology of water-based polyurethane and dynamic covalent bond, which is applied in the preparation of self-healing polyurethane water-based coating materials and the field of preparation of water-based polyurethane self-healing coating materials. It can solve the problems of no relevant reports and achieve good self-healing effect and good mechanical properties Effect

Inactive Publication Date: 2018-07-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no relevant report on visible light waterborne polyurethane self-healing coating materials based on the joint action of dual selenium dynamic covalent bonds and hydrogen bonds

Method used

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  • Water-based polyurethane self-repairing coating material based on double-selenium dynamic covalent bond and hydrogen bond
  • Water-based polyurethane self-repairing coating material based on double-selenium dynamic covalent bond and hydrogen bond
  • Water-based polyurethane self-repairing coating material based on double-selenium dynamic covalent bond and hydrogen bond

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: At 110°C, use a rotary distillation device to distill PEG-1000 under reduced pressure for 4 hours under a vacuum of 0.09MPa to remove moisture; Dimethylolpropionic acid was distilled under reduced pressure for 3 hours to remove moisture; 0.89g of 2-amino-4-hydroxy-6-methylpyrimidine and 1.52g of IPDI were added to the reaction vessel and reacted at 120°C 16 hours, then add 20ml of n-pentane to precipitate the product, then filter the precipitate with a sand core funnel, and wash it three times with n-pentane, bake the product in a vacuum oven at 40°C and 0.09MPa for 2 hours and evaporate the solvent to dryness , to obtain 1.28g of methylcytosine powder with isocyanate groups, that is, UPy-NCO; at 30°C, 1.28g of UPy-NCO and 0.71g of 2-amino-2-methyl-1,3-propanediol were refluxed in 30ml of chloroform After reacting for 5 hours, the product was centrifuged with a centrifuge at 10,000r / min, and the precipitated part was evaporated to dryness at 40°C and 0.09MPa ...

Embodiment 2

[0039] Example 2: At 120°C, use a rotary distillation device to distill PPG-1000 under reduced pressure for 3 hours under a vacuum of 0.09MPa to remove moisture; Dimethylolpropionic acid was distilled under reduced pressure for 3 hours to remove moisture; 0.49g of 2-amino-4-hydroxy-6-methylpyrimidine and 0.77g of IPDI were added to the reaction vessel and reacted at 100°C After 20 hours, 15ml of n-pentane was added to precipitate the product, and then the precipitate was filtered out with a sand core funnel and washed three times with n-pentane, and the product was baked in a vacuum oven at 40°C and 0.09MPa for 2 hours and evaporated to dryness , to obtain 0.73g of methylcytosine powder with isocyanate groups, that is, UPy-NCO; at 25°C, 0.73g of UPy-NCO and 0.36g of 2-amino-2-methyl-1,3-propanediol were refluxed in 30ml of chloroform After reacting for 4 hours, the product was centrifuged with a centrifuge at 10,000r / min, and the precipitated part was evaporated to dryness at ...

Embodiment 3

[0040] Example 3: At 120°C, use a rotary distillation device to distill PTMEG-1000 under reduced pressure for 2 hours under a vacuum of 0.09MPa to remove moisture; Dimethylolpropionic acid was distilled under reduced pressure for 3 hours to remove moisture; 0.90 g of 2-amino-4-hydroxy-6-methylpyrimidine and 1.61 g of IPDI were added to the reaction vessel and reacted at 120°C 16 hours, then add 25ml of n-pentane to precipitate the product, then use a sand core funnel to filter out the precipitate, and wash it three times with n-pentane, bake the product in a vacuum oven at 50°C and 0.09MPa for 3 hours and evaporate the solvent to dryness , to obtain 2.27g of methylcytosine powder with isocyanate groups, namely UPy-NCO; at 25°C, 1.27g of UPy-NCO and 0.31g of 2-amino-2-methyl-1,3-propanediol in 30ml of chloroform Reflux reaction for 6 hours, after the product was centrifuged at 10000r / min with a centrifuge, the precipitated part was evaporated to dryness at 40°C and 0.09MPa to o...

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Abstract

The invention discloses a preparation method of a water-based polyurethane self-repairing coating material based on double-selenium dynamic covalent bond and hydrogen bond. The material is prepared bythe following steps: firstly, performing reaction on diisocyanate, macromolecular diol, dihydromethyl propionic acid, a UPy-based chain extender and double-selenium diol to obtain a polyurethane prepolymer; then adding triethylamine and performing neutralization; finally adding deionized water and diamine, and performing emulsification and chain extending. The self-repairing property of the material is based on the visible light dynamic reversible characteristic of the double-selenium bond and the rapid breakage-recombination characteristic of the hydrogen bond, damage can be self-repaired rapidly and repeatedly under mild and visible illumination, damage to the material by the conditions such as high temperature and ultraviolet irradiation needed by the traditional self repairing is avoided, the hydrogen bond with rapid recombination and weak bond energy is combined with the double-selenium bond with slow recombination and strong bond energy, rapid and slow combination of the self repairing is realized, and better self-repairing effect is achieved. The material can be applied to coating in many fields and has wide application prospect.

Description

technical field [0001] The invention relates to a preparation method of a water-based polyurethane self-repairing coating material, especially the preparation of a self-repairing polyurethane water-based coating material based on the joint action of double selenium dynamic covalent bonds and hydrogen bonds, which belongs to polymer synthesis technology and intelligent polymer materials. field. Background technique [0002] Traditional solvent-based polyurethane coating materials will release a variety of harmful substances during production and use, endangering people's health, which makes the development and application of water-based polyurethane gradually become a hot spot. In recent years, the country has promulgated a series of environmental protection regulations, further restricting the production and use of solvent-based polyurethane, and also greatly promoting the development of water-based polyurethane coating materials. According to statistics, my country has bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/38C08G18/34C08G18/32C09D175/08C09D175/06
CPCC08G18/3275C08G18/348C08G18/3848C08G18/3897C08G18/4238C08G18/4833C08G18/4854C08G18/6659C08G18/6692C09D175/06C09D175/08
Inventor 金勇潘界舟张晓玲
Owner SICHUAN UNIV
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