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Self-repairing polyurethane nano-composite material and preparation method and application thereof

A nano-composite material and self-healing technology, applied in the field of self-healing polyurethane nano-composite materials and their preparation, can solve the problems of inability to self-repair, low repair efficiency, single repair method, etc., and achieve excellent self-healing performance, excellent mechanical properties, The effect of high tensile strength and elongation at break

Inactive Publication Date: 2017-09-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the common self-healing polymer materials generally need to be repaired by external heating. At the same time, they have the characteristics of low repair efficiency and single repair method, and cannot self-repair during use.

Method used

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  • Self-repairing polyurethane nano-composite material and preparation method and application thereof
  • Self-repairing polyurethane nano-composite material and preparation method and application thereof
  • Self-repairing polyurethane nano-composite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044]Synthesis of Diels-Alder bond-containing diols: Dissolve equivalent amounts of furan 1 and maleic anhydride 2 in excess 1,4-dioxane, stir and react at room temperature for 24 h, mash the resulting precipitate, and pass Vacuum filtration, washing with ether, and drying to obtain product 3; product 3 and ethanolamine in equivalent amounts were dissolved in methanol respectively under ice bath conditions, and then the two were mixed and stirred at 70 °C for reflux reaction for 24 h. The mixed solution was put into the refrigerator for cooling and crystallization, vacuum filtered, washed with ether, and dried to obtain product 4; product 4 was added to excess toluene, stirred and refluxed for 12 h at 130 °C, and then the solution was filtered, and the filtrate was placed in the refrigerator. Crystallization by cooling, vacuum filtration, washing with ether, and drying to obtain product 5; product 5 and furfuryl alcohol in an equivalent amount were stirred and reacted with exc...

Embodiment 2

[0046] Synthesis of isocyanate-terminated polyε-caprolactone-4000: Weigh polyε-caprolactone diol and diphenylmethane diisocyanate in the ratio of substance amount -OH / -NCO=2 / 1, Under nitrogen protection, the reaction was stirred at 80° C. for 2 h to obtain isocyanate-terminated polyε-caprolactone, which was sealed for use.

Embodiment 3

[0048] Preparation of self-healing polyurethane powder material containing Diels-Alder bonds: 0.896 g of the Diels-Alder bond-containing diol synthesized in Example 1, 13.5 g of the isocyanate-terminated poly(ε-hexane) synthesized in Example 2 Lactone-4000, 0.252 g of hexamethylene diisocyanate trimer were dissolved in 15 mL of anhydrous 1,4-dioxane. The mixture was degassed under reduced pressure and cast into open Teflon molds. It was placed in an oven at 80° C. for curing for 96 h to obtain a polyurethane containing Diels-Alder bonds. Finally, it is further prepared into a self-healing polyurethane powder material containing Diels-Alder bonds with a particle size of 10-150 μm by freeze-drying.

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Abstract

The invention discloses a self-repairing polyurethane nano-composite material and a preparation method and application thereof. The preparation method comprises the following steps: firstly, adding a surfactant and a conductive nano-filler into excessive absolute ethanol to obtain dispersion liquid containing the conductive nano-filler; then, adding a prepared self-repairing polyurethane powder material containing a Diels-Alder bond into the dispersion liquid, and performing suction filtration and drying to obtain a polyurethane powder material which is coated with the conducive nano-filler and contains the Diels-Alder bond; lastly, performing machine shaping to obtain a Diels-Alder bond-based multiple self-repairing polyurethane nano-composite material. The self-repairing polyurethane nano-composite material prepared by the method has the advantages that: (1) the material has excellent mechanical performance, excellent electric performance, an excellent photothermal effect and an excellent electromagnetic effect; (2) the material has excellent self-repairing performance; (3) the material has a plurality of repairing manners; (4) in a power-on state, sensing of cracking of the material can be realized, and self-repairing is performed.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and particularly relates to a self-repairing polyurethane nanocomposite material and a preparation method and application thereof. Background technique [0002] At present, polymer materials have been widely used in various fields, including daily necessities, textile industry, transportation industry, defense industry, aerospace, building materials, electronic devices, etc. However, these materials are susceptible to damage by external factors and their own aging during use, resulting in micro-cracks and even macro-cracks, resulting in a sharp decline in their safety, sustainability, and service life. Therefore, designing polymer materials that can repair themselves after mechanical damage is an effective means to improve the service life of materials. [0003] Diels-Alder bond is an effective reversible covalent bond, the reaction is regioselective, stereoselective and stereospecific...

Claims

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Application Information

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IPC IPC(8): C08L75/14C08K7/24
CPCC08K7/24C08K2201/001C08K2201/011C08L75/14
Inventor 夏和生蒲武利王占华傅代华杨莉卢锡立
Owner SICHUAN UNIV
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