High strength and high toughness self-repairing thermoplastic polyurethane urea elastomer and preparation method thereof

A polyurethane urea and high-toughness technology is applied in the field of high-strength and high-toughness self-healing thermoplastic polyurethane urea elastomer and its preparation, achieving high application value, maintaining integrity and functionality, and improving self-healing ability.

Inactive Publication Date: 2019-07-23
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xu [Chemistry of Materials, 2018, 30, 6026-6039] et al. used difunctional and trifunctional polyoxypropylene to carry out chain extension and crosslinking through isocyanate groups, and then capped with imidazole derivatives, through zinc ions and The coordination of imidazole derivatives induces almost 100% repair rate, but the tensile strength is only 2.26MPa

Method used

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  • High strength and high toughness self-repairing thermoplastic polyurethane urea elastomer and preparation method thereof
  • High strength and high toughness self-repairing thermoplastic polyurethane urea elastomer and preparation method thereof
  • High strength and high toughness self-repairing thermoplastic polyurethane urea elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Step (1): Set the R value to 2.0, put 0.010mol (20.000g) PPG2000 into the reactor, raise the temperature to 120°C, keep the vacuum at -0.095MPa and remove water for 1 hour while stirring, then lower the temperature to 80°C , pass into nitrogen for protection, put in 0.020mol (5.005g) MDI-100, stir and react for 1.5 hours, add 2.000×10 -6 mol of dibutyltin dilaurate continued to react for 1.5 hours to obtain an isocyanate group-terminated polyurethane prepolymer, which was protected under nitrogen for later use.

[0050] Step (2): Set the x / y ratio to 1.5, dissolve 0.002mol (0.218g) 2,6-diaminopyridine in 10mL N,N-dimethylformamide, and put it into the prepolymer obtained in step (1) In the process, the temperature was maintained at 80° C., protected by nitrogen gas, and after 2 hours of reaction, 0.016 mol (2.057 g) of p-chlorophenol was added to continue the reaction for 1 hour to obtain a polyurethane urea prepolymer blocked by an end-capping agent.

[0051] Step (3)...

Embodiment 2

[0053] Step (1): Set the R value to 2.0, put 0.010mol (20.000g) PPG2000 into the reactor, raise the temperature to 120°C, keep the vacuum at -0.095MPa and remove water for 1 hour while stirring, then lower the temperature to 80°C , pass into nitrogen for protection, put in 0.020mol (5.005g) MDI-100, stir and react for 1.5 hours, add 2.000×10 -6 mol of dibutyltin dilaurate continued to react for 1.5 hours to obtain an isocyanate group-terminated polyurethane prepolymer, which was protected under nitrogen for later use.

[0054] Step (2): Set the x / y ratio to 1, set 2.500×10 -3 mol (0.273g) of 2,6-diaminopyridine was dissolved in 10mL N,N-dimethylformamide, and put into the prepolymer obtained in step (1), the temperature was kept at 80°C, and the nitrogen gas was used for protection. After 2 hours of reaction , put in 0.015mol (1.928g) of p-chlorophenol and continue the reaction for 1 hour to obtain a polyurethane urea prepolymer capped by a capping agent.

[0055] Step (3): ...

Embodiment 3

[0057] Step (1): Set the R value to 2.0, put 0.010mol (20.000g) PPG2000 into the reactor, raise the temperature to 120°C, keep the vacuum at -0.095MPa and remove water for 1 hour while stirring, then lower the temperature to 80°C , pass into nitrogen for protection, put in 0.020mol (5.005g) MDI-100, stir and react for 1.5 hours, add 2.000×10 -6 mol of dibutyltin dilaurate continued to react for 1.5 hours to obtain an isocyanate group-terminated polyurethane prepolymer, which was protected under nitrogen for later use.

[0058] Step (2): Set the x / y ratio to 0.5, and set 3.333×10 -3 mol (0.363g) of 2,6-diaminopyridine was dissolved in 10mL of N,N-dimethylformamide, and put into the prepolymer obtained in step (1), the temperature was kept at 80°C, protected by nitrogen gas, and reacted for 2 hours After that, input 1.333×10 -2 mol (1.714g) of p-chlorophenol continued to react for 1 hour to obtain a polyurethane urea prepolymer terminated by an end-capping agent.

[0059] Ste...

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Abstract

The invention discloses a high strength and high toughness self-repairing thermoplastic polyurethane urea elastomer and a preparation method thereof. The self-repairing thermoplastic polyurethane ureaelastomer is synthesized by double chain extension of prepolymers generated from diisocyanate and polyether diols separately in the presence of 2,6-diaminopyridine and cysteamine. A pyridine ligand unit is introduced onto a main chain, and coordination bonds are formed between molecular chains through the coordination effect of metal ions, thereby forming interchain reversible molecular healing;at the same time, the coordination bonds act as dynamic crosslinking points and achieve the effects of limiting molecular chain slip and improving mechanical properties; a disulfide bond is introducedinto a macromolecular main chain through double chain extension, and the self-healing ability is improved in an association manner through a reversible exchange reaction of the main chain. The elastomer has the self-repairing efficiency being more than 85%, the tensile strength being not less than 8 MPa and the toughness being not less than 40 MJ/m<3>. The elastomer is capable of both improving mechanical properties and self-repairing performance, can maintain the integrity and functionality of materials against complex deformation, and has extremely high application value in the field of flexible electronic equipment.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a high-strength and high-toughness self-repairing thermoplastic polyurethane urea elastomer and a preparation method thereof. Background technique [0002] Self-healing polymer materials can respond to physical damage and help restore function, greatly improving their reliability and service life. In practical applications, self-healing materials are required to be robust, reliable and highly efficient in adapting to complex deformation retention functions. Therefore, it should have excellent comprehensive properties of high tensile strength, high toughness, high elongation and high repair rate, that is, "one body and four highs". . [0003] The introduction of dynamic covalent bonds and non-covalent bonds into macromolecules can produce various gels and elastomers with stimulus-induced self-healing behavior. However, the simultaneous improvement of the above three mec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/38
CPCC08G18/3246C08G18/3863C08G18/4825C08G18/6685
Inventor 魏柳荷李禹函刘兴江孙爱灵郭雯娟李雯娟
Owner ZHENGZHOU UNIV
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