Self-healing hyperbranched polyurethane with high mechanical strength as well as preparation method and application thereof

A technology of hyperbranched polyurethane and mechanical strength, applied in the preparation of polyurethane and the field of hyperbranched polyurethane network, can solve the problems of low mechanical properties of self-healing hyperbranched polyurethane, and achieve enhanced self-healing performance, strong practicability, and preparation method. simple effect

Active Publication Date: 2021-07-13
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors found that the mechanical properties of self-healing hyperbranched polyurethanes are relatively low, and the field of preparing hyperbranched polyurethanes with high mechanical properties and self-healing properties is still a blank

Method used

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  • Self-healing hyperbranched polyurethane with high mechanical strength as well as preparation method and application thereof
  • Self-healing hyperbranched polyurethane with high mechanical strength as well as preparation method and application thereof
  • Self-healing hyperbranched polyurethane with high mechanical strength as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0054] The preparation method of hyperbranched polyester is:

[0055] Put glycerin and bismethylolpropionic acid at a molar ratio of 1:3 in a 250ml four-neck flask, add dibutyltin dilaurate as a catalyst, connect a water separator, a thermometer and a stirrer, and adjust the temperature under nitrogen protection. Raise to 140°C and stir, react for 3 hours, keep the temperature at 140°C, reduce the pressure to -0.1MPa to carry out polycondensation, and continue to react for 3 hours. A hyperbranched polyester is obtained.

Embodiment 1

[0058] Put polytetrahydrofuran, VA and isophorone diisocyanate with a molar ratio of 1:0.15:2 in a 250ml four-neck flask, use N,N-dimethylformamide as a solvent, connect a spherical condenser, a thermometer and Stirrer, under the protection of nitrogen, the temperature was raised to 50° C. to dissolve and stir the raw materials, and then the temperature was raised to 75° C. to react for 3 hours to obtain a prepolymer of isocyanate-terminated polyurethane. Then, slowly add 2,4,6-triaminopyridine to the flask in an amount of 15% of the molar weight of isophorone diisocyanate, and add the catalyst dibutyltin dilaurate in an amount of 0.05% of the mass of PBIS , after the raw material is completely dissolved, react for 1h, then add hyperbranched polyester wherein, the add-on is 65% of the molar weight of isophorone diisocyanate, then add tannic acid therein, the add-on is isophorone diisocyanate 20% of the molar amount of isocyanate, under the protection of nitrogen, continue to r...

Embodiment 2

[0061] Put polytetrahydrofuran, VA and isophorone diisocyanate with a molar ratio of 1:0.4:2 in a 250ml four-neck flask, use N,N-dimethylformamide as a solvent, connect a spherical condenser, a thermometer and Stirrer, under the protection of nitrogen, the temperature was raised to 50° C. to dissolve and stir the raw materials, and then the temperature was raised to 70° C. to react for 2 hours to obtain a prepolymer of isocyanate-terminated polyurethane. Then, slowly add 2,4,6-triaminopyridine to the flask in an amount of 20% of the molar weight of isophorone diisocyanate, and add the catalyst dibutyltin dilaurate in an amount of 0.05% of the mass of PBIS , after the raw material is completely dissolved, react for 1h, then add hyperbranched polyester therein, the add-on is 50% of the molar weight of isophorone diisocyanate, then add tannic acid therein, the add-on is isophorone diisocyanate 30% of the molar amount of isocyanate, under the protection of nitrogen, continue to re...

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Abstract

The invention belongs to the field of polymer preparation, and relates to self-healing hyperbranched polyurethane with high mechanical strength as well as a preparation method and application of the self-healing hyperbranched polyurethane. The method comprises the following steps: making polytetrahydrofuran, N-(4-hydroxy-3-methyl phenyl methylene)-p-hydroxyaniline (VA) and isophorone diisocyanate react to obtain an isocyanate-terminated polyurethane prepolymer, and then, making the isocyanate-terminated polyurethane prepolymer, hyperbranched polyester, triaminopyridine and tannic acid heated to 80 DEG C under the protection of nitrogen and react to obtain the self-healing crosslinked polyurethane based on the hydrogen bonds. The preparation method of the self-healing polyurethane is novel, the hyperbranched polyester reacts with the isocyanate group-terminated prepolymer to prepare the polyurethane with relatively strong self-healing capability and relatively high mechanical strength, and the self-healing polyurethane has a wide market prospect. Steps are simple, operation is convenient, and practicability is high.

Description

technical field [0001] The invention relates to a method for preparing polyurethane, in particular to preparing a hyperbranched polyurethane network rich in a large number of hydrogen bonds by reacting hyperbranched polyester, triaminopyridine, tannic acid and terminal isocyanate group polyurethane, belonging to the field of polymer preparation. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Polyester polyol is a kind of polymer prepared by polycondensation reaction of polycarboxylic acid and polyol. It is the most commonly used and most important synthetic raw material for polyurethane, because in the process of polyurethane synthesis, polyester polyol can provide polyur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/42C08G18/32C08G18/12C08J5/18
CPCC08G18/755C08G18/4854C08G18/3819C08G18/6666C08G18/12C08J5/18C08J2375/08C08G18/42C08G18/3246C08G18/3218
Inventor 高传慧王思凯赵景明王日璇王彦庆刘月涛武玉民
Owner QINGDAO UNIV OF SCI & TECH
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