Transparent high strength and high toughness room temperature self-repairing thermoplastic polyurethane urea elastomer and preparation method

A polyurethane urea, high-strength technology, applied in the field of transparent, high-strength, high-toughness room temperature self-healing thermoplastic polyurethane urea elastomer and its preparation, achieving high application value, low activation energy, and improved mechanical properties

Inactive Publication Date: 2019-08-09
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The self-healing ability and mechanical properties of polymer materials have a competitive dependence on the chain segment motion, so there are certain limitations in synchronously improving the two properties

Method used

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  • Transparent high strength and high toughness room temperature self-repairing thermoplastic polyurethane urea elastomer and preparation method
  • Transparent high strength and high toughness room temperature self-repairing thermoplastic polyurethane urea elastomer and preparation method
  • Transparent high strength and high toughness room temperature self-repairing thermoplastic polyurethane urea elastomer and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Step (1): Set the R value to 2.0, put 0.020mol (40.000g) DL2000 into the reactor, raise the temperature to 115°C, keep the vacuum at -0.098MPa and remove water for 1 hour while stirring, then lower the temperature to 95°C , feed nitrogen for protection, drop 0.040mol (8.892g) IPDI, stir and react for 1.5 hours, add 4.000 × 10 -6mol of dibutyltin dilaurate continued to react for 2 hours to obtain an isocyanate group-terminated polyurethane prepolymer, which was protected under nitrogen for further use.

[0044] Step (2): The x / y ratio is set to 1.5, the R’ value is set to 0.95, the coordination ratio is set to 4:1, and 3.800×10 - 3 mol (0.529g) of 2,6-pyridinedimethanol was dissolved in 30mL of N,N-dimethylformamide, and put into the prepolymer obtained in step (1), the temperature was kept at 95°C, protected by nitrogen gas, and reacted for 2 hours After that, input 1.520×10 -2 mol (3.775g) 4,4'-diaminodiphenyl disulfide continued to react for 2 hours, dropped into 0...

Embodiment 2

[0046] Step (1): Set the R value to 2.0, put 0.020mol (40.000g) DL2000 into the reactor, raise the temperature to 115°C, keep the vacuum at -0.098MPa and remove water for 1 hour while stirring, then lower the temperature to 95°C , feed nitrogen for protection, drop 0.040mol (8.892g) IPDI, stir and react for 1.5 hours, add 4.000 × 10 -6 mol of dibutyltin dilaurate continued to react for 2 hours to obtain an isocyanate group-terminated polyurethane prepolymer, which was protected under nitrogen for further use.

[0047] Step (2): The x / y ratio is set to 1.0, the R’ value is set to 0.95, the coordination ratio is set to 4:1, and 4.750×10 - 3 mol (0.661g) of 2,6-pyridinedimethanol was dissolved in 30mL of N,N-dimethylformamide, and put into the prepolymer obtained in step (1), the temperature was kept at 95°C, protected by nitrogen gas, and reacted for 2 hours After that, input 1.425×10 -2 mol (3.539g) 4,4'-diaminodiphenyl disulfide continued to react for 2 hours, dropped into ...

Embodiment 3

[0049] Step (1): Set the R value to 2.0, put 0.020mol (40.000g) DL2000 into the reactor, raise the temperature to 115°C, keep the vacuum at -0.098MPa and remove water for 1 hour while stirring, then lower the temperature to 95°C , feed nitrogen for protection, drop 0.040mol (8.892g) IPDI, stir and react for 1.5 hours, add 4.000 × 10 -6 mol of dibutyltin dilaurate continued to react for 2 hours to obtain an isocyanate group-terminated polyurethane prepolymer, which was protected under nitrogen for further use.

[0050] Step (2): The x / y ratio is set to 1.0, the R’ value is set to 0.95, the coordination ratio is set to 4:1, and 6.333×10 - 3 mol (0.881g) of 2,6-pyridinedimethanol was dissolved in 30mL N,N-dimethylformamide, and put into the prepolymer obtained in step (1), the temperature was kept at 95°C, protected by nitrogen gas, and reacted for 2 hours After that, input 1.267×10 -2 mol (3.146g) 4,4'-diaminodiphenyl disulfide continued to react for 2 hours, dropped into 0.0...

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Abstract

The invention discloses a transparent high strength and high toughness room temperature self-repairing thermoplastic polyurethane urea elastomer and a preparation method. The elastomer is synthesizedby: conducting chain extension twice on a prepolymer generated from diisocyanate and polyether diol with 2, 6-pyridine dimethanol and 4, 4'-diaminodiphenyl disulfide respectively. The pyridine ring onthe main chain can coordinate with polyvalent metal ions to form coordinate bonds between macromolecular chains, thus inducing self-repairing capability and also limiting molecular chain slip so as to improve the tensile strength and toughness. The aromatic disulfide on the main chain has low activation energy, and can produce reversible exchange reaction under room temperature condition to realize efficient self-repairing ability. By controlling the R value and the relative ratio of the two chain extenders, the tensile strength of the polyurethane urea elastomer can reach 8MPa or above, thetoughness can reach 45MJ / m<3> or above, the 6h self-repairing efficiency at 25DEG C can reach 90% or above, and the light transmittance can reach 95% or above. The transparent high strength and high toughness room temperature self-repairing thermoplastic polyurethane urea elastomer provided by the invention has excellent mechanical properties, self-repairing capability and light transmittance, canmeet the use requirements of flexible intelligent electronic equipment, and has great application potential.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a transparent, high-strength, high-toughness self-repairing thermoplastic polyurethane urea elastomer at room temperature and a preparation method thereof. Background technique [0002] In recent years, intelligent technology products have developed vigorously. Self-healing materials, especially self-healing elastomers, as carrier materials for smart electronic devices, can effectively repair physical damage and prolong the service life. Functional composite materials based on self-healing elastomers such as electronic skin, Sensors, etc., can cope with physical damage, restore functionality, and greatly improve their reliability and service life. [0003] Applying self-healing elastomers to smart electronic devices has robust and reliable functions and efficient repair capabilities. On the one hand, self-healing elastomers should have high tensile strength, high elonga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/48C08G18/32C08G18/10
CPCC08G18/10C08G18/4825C08G18/755C08G18/3844C08G18/3857
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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