Self-repairing waterborne polyurethane/rGO@PDA composite material as well as preparation method and application thereof
A technology of water-based polyurethane and composite materials, applied in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve problems such as the impact of aging performance, and achieve the effects of increased service life, excellent barrier properties and light-to-heat conversion efficiency
Inactive Publication Date: 2020-09-01
SICHUAN UNIV
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Problems solved by technology
However, for thermally repaired water-based polyurethane coatings, the overall coating needs to be heated to repair its damage, which will have a certain impact on the overall properties of the material such as mechanical properties, thermal stability, and aging properties.
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[0023] The specific technical solutions of the present invention are described in conjunction with the examples.
[0024] Self-healing waterborne polyurethane / rGO@PDA composite material, preparation method, comprising the following steps:
[0025] (1) Preparation of self-healing waterborne polyurethane
[0026] Diisocyanate, macromolecular polyol, hydrophilic chain extender, react at 80°C for 2 hours; add diol small molecule containing Diels-Alder dynamic bond and continue to react for 2 hours; add Tri-HDI crosslinking agent, react for 2 hours; Cool down to 40°C, add triethylamine to neutralize; emulsifier stirs at high speed to disperse in aqueous solvent;
[0027] (2) Preparation of modified graphene oxide
[0028] Graphene oxide was modified with 3-aminopropyltriethoxysilane, i.e. rGO; rGO was ultrasonically dispersed in Tris-HCl buffer solution with pH = 8.5; ethanol was added and stirred at room temperature for 30 minutes; dopamine hydrochloride was added at room temper...
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Abstract
The invention provides a self-repairing waterborne polyurethane / rGO@PDA composite material as well as a preparation method and application thereof. The elf-repairing waterborne polyurethane / rGO@PDA composite material is obtained by adding a proper amount of polydopamine attached graphene oxide into a self-repairing waterborne polyurethane and ultrasonically dispersing for 2 hours. The composite material can improves the dispersion stability of rGO in water, can be applied to a water-based polymer material system; damage repair of a metal protective coating is achieved through near-infrared light irradiation, and the service life of the coating is prolonged. The composite material is used for metal corrosion prevention, has excellent corrosion prevention performance, and can be used for healing wounds by irradiating the wounds with near-infrared light when the wounds are damaged, so that remote and fixed-point repair of material damage is realized.
Description
technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a self-repairing waterborne polyurethane / rGO@PDA composite material and its preparation method and application. [0002] technical background [0003] With the increasingly severe environmental situation, the control of volatile organic solvents (VOC) released during the production and use of polymer materials is becoming more and more stringent. Therefore, green and environmentally friendly waterborne polyurethane has attracted much attention because of its non-toxicity and wide application. At the same time, the service life of polymer materials will be greatly reduced due to cracks, fatigue and even external damage during use. Especially for polymer materials used as metal anti-corrosion coatings, once cracks occur, the protective function of the coating will fail, and the corrosion of metals will be accelerated. Therefore, self-healing water-based polyu...
Claims
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IPC IPC(8): C09D175/04C09D5/08C09D7/62
CPCC09D5/08C09D175/04C09D7/62C09D7/70C08K9/06C08K9/08C08K3/042C08K7/00
Inventor 夏和生于长江王占华玛蒂娜·萨尔萨诺·德卢娜拉瓦叶纳·马里罗
Owner SICHUAN UNIV