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Polyurea self-repairing thermoplastic elastomer and preparation method thereof

A thermoplastic elastomer and self-repairing technology, which is applied in the field of polyurea self-repairing thermoplastic elastomer and its preparation, and the preparation of self-repairing thermoplastic elastomer, can solve the problem of low breaking strength, achieve strong disulfide bond interaction, and produce no Toxic and harmless, the effect of mild reaction conditions

Inactive Publication Date: 2018-10-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the self-healing efficiency of the material reaches 90%, but the fracture strength is low, only 0.5 MPa

Method used

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  • Polyurea self-repairing thermoplastic elastomer and preparation method thereof
  • Polyurea self-repairing thermoplastic elastomer and preparation method thereof
  • Polyurea self-repairing thermoplastic elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of the polyurea self-healing thermoplastic elastomer of the present invention comprises the following processing steps:

[0036] Step 1, mix and stir 4.42 g 1,6-diisocyanate and 6.00 g polypropylene glycol 400 evenly, add 0.048 g dibutyltin dilaurate, heat and stir in a water bath at 30-35°C for 30-40 min to obtain Prepolymer;

[0037] Step 2, 2.48 g of 2,2'-dithiodianiline was dissolved in 0.62 g of dimethylformamide, sealed for later use;

[0038] Step 3, the prepolymer is dissolved in 4.2 g of dimethylformamide, sealed for subsequent use;

[0039] Step 4: After mixing and stirring the chain extender solution and the prepolymer solution evenly, vacuum defoaming, curing and molding at room temperature, keeping for 1 day, and vacuum drying at 60°C for 3-4 days to constant weight, to obtain polyurea self-healing thermoplastic elastomer.

Embodiment 2

[0041] The preparation method of the polyurea self-healing thermoplastic elastomer of the present invention comprises the following processing steps:

[0042] Step 1, mix and stir 4.42 g 1,6-diisocyanate and 6.00 g polypropylene glycol 400 evenly, add 0.048 g dibutyltin dilaurate, heat and stir in a water bath at 30-35°C for 30-40 min to obtain Prepolymer;

[0043] Step 2, 2.48 g of 4,4'-dithiodianiline was dissolved in 0.62 g of dimethylformamide, sealed for later use;

[0044] Step 3, the prepolymer is dissolved in 4.2 g of dimethylformamide, sealed for subsequent use;

[0045] Step 4: After mixing and stirring the chain extender solution and the prepolymer solution evenly, vacuum defoaming, curing and molding at room temperature, keeping for 1 day, and vacuum drying at 60°C for 3-4 days to constant weight, to obtain polyurea self-healing thermoplastic elastomer.

Embodiment 3

[0047] The preparation method of the polyurea self-healing thermoplastic elastomer of the present invention comprises the following processing steps:

[0048] Step 1, mix and stir 4.42 g 1,6-diisocyanate and 9.00 g polypropylene glycol 600 evenly, add 0.048 g dibutyltin dilaurate, heat and stir in a water bath at 30-35°C for 30-40 min to obtain Prepolymer;

[0049] Step 2, 2.48 g of 4,4'-dithiodianiline was dissolved in 0.62 g of dimethylformamide, sealed for later use;

[0050] Step 3, the prepolymer is dissolved in 5.4 g of dimethylformamide, sealed for subsequent use;

[0051] Step 4: After mixing and stirring the chain extender solution and the prepolymer solution evenly, vacuum defoaming, curing and molding at room temperature, keeping for 1 day, and vacuum drying at 60°C for 3-4 days to constant weight, to obtain polyurea self-healing thermoplastic elastomer.

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Abstract

The invention discloses a polyurea self-repairing thermoplastic elastomer and a preparation method thereof. The preparation method comprises the following steps of introducing a monomer containing dynamic disulfide bonds into a polyurea reaction system; defoaming under the vacuum condition, curing and forming, so as to obtain the polyurea thermoplastic elastomer with self-repairing property. The polyurea self-repairing thermoplastic elastomer is prepared from the following components in parts by mass: 10 to 20 parts of diisocyanate, 45 to 70 parts of polypropylene glycol, 7 to 12 parts of chain extender, and 3 to 4 parts of catalyst. The polyurea self-repairing thermoplastic elastomer has the advantages that the self-repairing can be performed for multiple times without external conditionstimulation and special condition requirement, and the good mechanical property is realized.

Description

technical field [0001] The invention relates to a preparation method of a self-repairing thermoplastic elastomer, in particular to a polyurea self-repairing thermoplastic elastomer and a preparation method thereof, belonging to the field of polymer material preparation. Background technique [0002] Self-healing materials refer to a class of materials that have self-monitoring, self-adaptive and self-healing properties, and can autonomously sense and repair damage to the surface or itself. The self-healing property of the self-healing material can repair the damage of the material during the use of the material, significantly prolong the life of the material, and improve the safety of the material. As a new type of bionic intelligent material, self-healing materials have broad development prospects and important application value in some important engineering and special fields. [0003] At present, more researches are on self-healing materials based on hydrogen bonding. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/66C08G18/48C08G18/32
CPCC08G18/10C08G18/4825C08G18/6685C08G18/3855
Inventor 肖正刚张响王悦
Owner NANJING UNIV OF SCI & TECH
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