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Polyurethane-based self-healing material and preparation method thereof

A composite material and polyurethane technology, applied in the field of polyurethane-based self-healing materials and their preparation, can solve the problems of difficult expansion of material application, difficulty of self-healing materials with mechanical properties and self-healing effects, etc., to increase mechanical properties performance effect

Active Publication Date: 2020-12-01
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the self-healing materials obtained by these methods are usually difficult to have both high mechanical properties and excellent self-healing effects, so that the application of materials is difficult to expand

Method used

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  • Polyurethane-based self-healing material and preparation method thereof
  • Polyurethane-based self-healing material and preparation method thereof
  • Polyurethane-based self-healing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 2

[0060] The synthesis of embodiment 1 diaminodiphenylalkyl diselenide

[0061] Take 1.23g of selenone, 1.00g of 4-aminobenzylamine and 40ml of tetrahydrofuran in a 100ml round bottom flask, stir well, and react at 40°C for 2 hours to obtain diaminodiphenylalkyl diselenide.

[0062] The reaction scheme is as follows:

[0063]

[0064] figure 1 , figure 2 The result of NMR characterization of the synthesized diaminodiphenylalkyl diselenide shows that diaminodiphenylalkyl diselenide was successfully obtained in this example.

Embodiment 2

[0065] The end group modification reaction of embodiment 2 polypropylene glycol

[0066] 1) End group modification of dihydroxypolypropylene glycol (Mn=2000g / mol)

[0067] Get 30g of dihydroxypolypropylene glycol (Shanghai McLean Biochemical Technology Co., Ltd., PPG-2000, number 2, Mn=2000g / mol) and place in a 500ml reaction bottle equipped with a mechanical stirrer, heat at 80°C for 4 hours and pump gas, dehumidify the reaction system. When the humidity of the system is less than 20%, lower the temperature to 70°C, add 6.66g of isophorone diisocyanate (No. 1) and 50mmp of catalyst dibutyltin dilaurate (DBTDL) into the reaction flask, and react in tetrahydrofuran for 60 minutes , to obtain a diisocyanate-terminated prepolymer (No. 4), and carry out infrared tracking on the whole reaction process.

[0068] The reaction scheme is as follows:

[0069]

[0070] 2) Trihydroxypolypropylene glycol (Mn=3000g / mol) end group modification

[0071] Get 30g trihydroxypolypropylene ...

Embodiment 3

[0075] The film-forming synthesis of embodiment 3 self-healing materials

[0076] Taking the molar ratio of diisocyanate-terminated prepolymer and triisocyanate-terminated prepolymer as 1:1 as an example, the preparation method of the polyurethane-based self-healing material of the present invention is as follows:

[0077] In a polytetrafluoroethylene mold, add 4 g of diisocyanate-terminated prepolymer (2 mmol, code 4), 6 g of triisocyanate-terminated prepolymer (2 mmol, code 5) and diaminodiphenylalkyl diselenide in sequence A tetrahydrofuran (20-40mL) solution of ether (2.23g, No. 9) was stirred rapidly, dried in vacuum, solvent removed, and reacted at 60°C for 24h to obtain a polyurethane-based self-healing material (No. 10 / 11). Infrared tracking of the entire reaction process.

[0078] The reaction scheme is as follows Figure 5 As shown, among the substances numbered 10 and 11 in the figure, only the specific structural formula of a part of the repeating unit is provide...

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Abstract

The invention relates to a preparation method of a polyurethane-based self-healing material. The preparation method comprises the following steps: reacting dihydroxypolypropylene glycol and trihydroxypolypropylene glycol with IPDI at 50-80 DEG C respectively to obtain a first isocyanate-terminated polyurethane prepolymer and a second isocyanate-terminated polyurethane prepolymer respectively; uniformly mixing the first polyurethane prepolymer, the second polyurethane prepolymer and diaminodiphenylalkyl diselenide, then reacting at 50-70 DEG C to obtain the polyurethane-based self-healing material. The invention further provides the polyurethane-based self-healing material prepared by the preparation method. the polyurethane-based self-healing material adopts a structural formula as follows: FORMULA. By virtue of rapid and efficient exchange between Se-Se dynamic covalent bonds, a material capable of achieving 100% healing efficiency in a short time and at room temperature is prepared;in addition, a urea group is also introduced into the material, so that mechanical properties of the material are improved.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a polyurethane-based self-healing material and a preparation method thereof. Background technique [0002] In the 1980s, Jud and others proposed the concept of self-healing materials, that is, using the self-sensing ability of materials to respond to micro-cracks in materials, and then trigger self-healing to restore their mechanical properties and prolong their service life. At present, self-healing materials have been applied in many fields such as aerospace, electronics, and construction. As a new class of self-healing materials, polymer-based self-healing materials have received much attention from the scientific community, and many research progresses have been made. [0003] Due to the influence of thermal, mechanical and chemical factors, polymer materials will produce cracks during application, which will affect their service life and mechanical properties. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/12C08G18/32C08L75/08
CPCC08G18/12C08G18/4812C08G18/4825C08G18/4829C08G18/6685C08L75/08C08G18/3897
Inventor 朱健钱玉清李娜潘向强朱秀林
Owner SUZHOU UNIV
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