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Crosslinked polyurea elastomer with self-repairing property and preparation method thereof

A technology of cross-linked polyurea and self-repair, which is applied in the field of self-repair materials, can solve problems such as the inability to realize coating repair and the limitation of reprocessing performance of polyurea elastomers, and achieve self-repair reprocessing performance, excellent mechanical properties, To achieve the effect of destruction and reconstruction

Active Publication Date: 2018-09-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the cross-linked structure or extremely strong hydrogen bond structure inside the polyurea material, when the polyurea coating is damaged, the coating cannot be repaired, and the reprocessing performance of polyurea elastomers has always been limited.

Method used

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  • Crosslinked polyurea elastomer with self-repairing property and preparation method thereof
  • Crosslinked polyurea elastomer with self-repairing property and preparation method thereof
  • Crosslinked polyurea elastomer with self-repairing property and preparation method thereof

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preparation example Construction

[0040] The method for preparing a cross-linked polyurea elastomer with self-healing properties according to an embodiment of the present invention uses a trifunctional isocyanate or a higher-functional isocyanate as a cross-linking agent to connect a monomer containing a disulfide bond to a multifunctional polyurea elastomer. On the isocyanate, the dynamic cross-linking point of the polyurea system is constructed in a novel form, and a cross-linked polyurea elastomer containing disulfide bonds and hydrogen bonds is prepared, and the resulting cross-linked polyurea elastomer containing disulfide bonds and hydrogen bonds The disulfide bonds in the body can realize rapid dynamic exchange reaction at a certain temperature, so as to realize the destruction and reorganization of dynamic cross-linking points. At the same time, the hydrogen bonds in the system can also be dissociated and rebuilt under the action of temperature, promoting the whole new The reconstruction of the polyurea...

Embodiment 1

[0044] (1) Take 0.84g (5.0mmol) of 1,6-hexamethylene diisocyanate and dissolve it in tetrahydrofuran solvent, pour it into a flask, and then take 5.00g (2.50mmol) of amino-terminated polyoxypropylene ether monomer and dissolve it in In tetrahydrofuran solvent, slowly drop into the flask, under the stirring of 300rpm at room temperature, pass through nitrogen to react for 1h, and carry out solution reaction to obtain polyurea prepolymer terminated by isocyanate group;

[0045] (2) Take 0.96g (1.67mmol) of 1,6-hexamethylene diisocyanate trimer and dissolve it in tetrahydrofuran solvent, then add it to the polyurea prepolymer solution obtained above, and mix well;

[0046] (3) Dissolve 1.24g (5.00mmol) of 4,4'-diaminodiphenyl disulfide in a tetrahydrofuran solvent, add it to the above mixed solution, and react for 0.5h to obtain a polyurea elastomer solution;

[0047] (4) Pour the above-mentioned product solution into a polytetrafluoroethylene mold, put it into a vacuum oven at 8...

Embodiment 2

[0049] (1) Dissolve 1.39g (5.00mmol) of 4,4'-diphenylmethane diisocyanate in tetrahydrofuran solvent, pour it into a flask, and then take 5.03g (2.50mmol) of amino-terminated polyoxypropylene ether monomer to dissolve In tetrahydrofuran solvent, slowly drop into the flask, under stirring at 300rpm at room temperature, pass through nitrogen to react for 1h, and perform solution reaction to obtain isocyanate group-terminated polyurea prepolymer;

[0050] (2) Take 0.96g (1.67mmol) of 1,6-hexamethylene diisocyanate trimer and dissolve it in tetrahydrofuran solvent, then add it to the polyurea prepolymer solution obtained above, and mix well;

[0051] (3) Dissolve 1.24g (5.0mmol) of 2,2'-diaminodiphenyl disulfide in tetrahydrofuran solvent, add it to the above mixed solution, and react for 0.5h to obtain a polyurea elastomer solution;

[0052] (4) Pour the above-mentioned product solution into a polytetrafluoroethylene mold, put it into a vacuum oven at 85°C for solvent volatilizat...

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Abstract

The invention discloses a crosslinked polyurea elastomer with a self-repairing property and a preparation method thereof. The preparation method comprises the following step of copolymerizing a diisocyanate group-containing monomer, an amino-terminated vinyl ether monomer, trifunctional or higher functional isocyanate and a disulfide bond-containing monomer to obtain the crosslinked polyurea elastomer with the self-healing property. According to the preparation method, the trifunctional or higher functional isocyanate is used as a crosslinking agent, and the disulfide bond-containing monomer is attached to the polyfunctional isocyanate to form a dynamic crosslinking point of a polyurea system; a rapid dynamic exchange reaction can be performed on a disulfide bond in the obtained polyurea elastomer at a certain temperature, so that destruction and recombination of the dynamic crosslinking point are achieved; moreover, dissociation and reconstruction of a hydrogen bond in the system areachieved under the action of the temperature, so that reconstruction of a whole novel polyurea network structure is promoted and repairing and reworking of damages such as cracks are achieved; therefore, the polyurea elastomer has the excellent self-healing property and repeated processing performance and good mechanical properties.

Description

technical field [0001] The invention belongs to the field of self-healing materials, in particular, the invention relates to a cross-linked polyurea elastomer with self-healing performance and a preparation method thereof. Background technique [0002] Polyurea elastomer is a block polymer formed by the reaction of isocyanate component (A component) and amino compound component (B component, including amino-terminated polyether and polyamine, etc.). Due to the excellent physical and chemical properties of polyurea elastomer and the performance adjustment through the change of the ratio of soft and hard segments, such as good flexibility, excellent waterproof performance and corrosion resistance, etc., and its rapid response, it is suitable for rapid prototyping methods such as spraying, so In recent years, polyurea has been widely concerned as a new type of coating. [0003] However, due to the cross-linked structure or extremely strong hydrogen bond structure inside the po...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/73C08G18/50C08G18/38C08G18/10
CPCC08G18/10C08G18/5024C08G18/73C08G18/755C08G18/758C08G18/3868
Inventor 郭宝华徐军李婷
Owner TSINGHUA UNIV
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