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Self-repairing waterborne polyurethane coating containing imine bonds

A water-based polyurethane, imine bond technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problem of low repair rate of self-healing materials, and achieve the effects of excellent self-healing effect, strong mechanical properties, and simple and rapid response.

Pending Publication Date: 2022-05-31
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of self-healing water-based polyurethane coating containing imine bond, to solve the technical defect of low repair rate of self-healing materials in the prior art

Method used

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  • Self-repairing waterborne polyurethane coating containing imine bonds
  • Self-repairing waterborne polyurethane coating containing imine bonds
  • Self-repairing waterborne polyurethane coating containing imine bonds

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A kind of self-healing waterborne polyurethane coating containing imine bond, its preparation method comprises the steps:

[0031] (1) Preparation of polyurethane chain extender containing imine bond

[0032] Add 10g of p-phenylenediamine and 150ml of absolute ethanol into a 500ml three-neck flask and heat until completely dissolved to obtain mixture B, dissolve 12g of p-hydroxybenzaldehyde in 150ml of absolute ethanol to obtain mixture A, add 1.2ml of acetic acid to mixture A The mixture C was obtained as a catalyst, and the mixture C was slowly dropped into the mixture B, stirred with a magnetic force, and heated to 100° C. for 5 hours in an oil bath under reflux. The resulting reaction system was cooled at room temperature, and a large amount of light yellow crystals were precipitated, filtered under reduced pressure, rinsed with absolute ethanol for 3 to 4 times, the filter cake was taken out, and dried in vacuum to obtain compound C—p-phenylenediamine p-hydroxybenz...

Embodiment 1

[0042] The tensile strength of the coating film obtained in Example 1 is 31.94MPa, the elongation at break is 1154.2, and the scratches disappear completely after being repaired at 60°C for 5 minutes. figure 2 , After being completely cut off, after repairing at 80°C for 2 hours, the tensile strength of the coating film was 31.70MPa, the elongation at break was 1039.0, and the self-healing rate was 99.2%.

[0043] After the obtained coating film is crushed, the result obtained is as follows: Figure 4 , after 100°C, 10min, 5MPa heat treatment in a hot press, it becomes a smooth and complete coating film again. Figure 5 .

Embodiment 2

[0045] A kind of self-healing waterborne polyurethane coating containing imine bond, its preparation method comprises the steps:

[0046] (1) Preparation of polyurethane chain extender containing imine bond

[0047] Add 10g of o-phenylenediamine and 150ml of absolute ethanol into a 500ml three-neck flask and heat until completely dissolved to obtain mixture B, dissolve 12g of salicylaldehyde in 150ml of absolute ethanol to obtain mixture A, add 1.2ml of acetic acid to mixture A as a catalyst to obtain Mixture C, slowly drop mixture C into mixture B, stir magnetically, heat to 100° C. and reflux for 5 h in an oil bath. The obtained reaction system was cooled at room temperature, and a large amount of pale yellow crystals were precipitated, filtered under reduced pressure, rinsed with absolute ethanol for 3 to 4 times, the filter cake was taken out, and dried in vacuum to obtain compound C—o-phenylenediamine salicylaldehyde bis-Schiff base.

[0048] (2) Preparation of waterborn...

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Abstract

The invention discloses a self-repairing waterborne polyurethane coating containing an imine bond, and relates to the technical field of coatings, a series of self-repairing waterborne polyurethane coatings containing the imine bond are prepared by synthesizing different types of polyurethane chain extenders containing the imine bond and reacting the polyurethane chain extenders with different polyurethane soft chain segments, isocyanate and hydrophilic chain extenders; a good self-repairing effect is achieved at the room temperature, and after repairing is conducted for 2 h at the temperature of 80 DEG C, the repairing rate reaches 99.2%. According to the prepared self-repairing waterborne polyurethane coating, the preparation technology is simple, the raw materials are cheap and easy to obtain, the coating has the high self-repairing rate, and maintenance of an industrial coating is facilitated.

Description

technical field [0001] The invention relates to the field of paint synthesis, in particular to a green and environment-friendly water-based polyurethane paint with self-repairing properties. Background technique [0002] Water-based polyurethane coatings use water instead of organic solvents, which are more environmentally friendly than traditional solvent-based polyurethane coatings. Waterborne polyurethane coatings are widely used in various fields such as clothing, construction, transportation, aerospace, medical supplies, etc. due to their excellent wear resistance, chemical corrosion resistance, high strength, and easy modification design. However, waterborne polyurethane coatings During the use of the coating, due to the impact of external environments such as collision, corrosion, and photodegradation, microcracks will occur in the coating, resulting in a decrease in the mechanical properties of the material and affecting the functionalization of the coating. Therefo...

Claims

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Application Information

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IPC IPC(8): C09D175/08C09D175/06C08G18/75C08G18/66C08G18/48C08G18/42C08G18/32C08G18/34
CPCC09D175/08C09D175/06C08G18/755C08G18/758C08G18/6692C08G18/6659C08G18/4854C08G18/4277C08G18/4238C08G18/3206C08G18/348C08G18/3819
Inventor 杨建军袁野吴庆云吴明元张建安刘久逸
Owner ANHUI UNIVERSITY
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