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Thermally-reversible self-repairing electrostatic dissipation polyurethane membrane and production method thereof

A static dissipative, polyurethane film technology, used in polyurea/polyurethane coatings, conductive coatings, coatings, etc., can solve problems such as R&D work that has not been reported yet, the decline of electrostatic conductivity, and the disappearance of self-healing ability, achieving excellent The effect of thermal stability, outstanding heat resistance, high self-healing ability

Active Publication Date: 2015-11-18
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with these methods is that the number of repairs is small. Once the curing agent is used up, the material will no longer have self-healing ability. Therefore, realizing "reversible" self-healing is a hot spot in material research today.
This self-healing method is not reversible. Once the zinc powder is consumed, its self-healing ability will disappear. At the same time, the consumption of zinc powder means that the electrostatic conductivity will also decrease.
[0008] To sum up, modern industry and human life urgently need coatings with both electrostatic dissipation and reversible self-healing properties, but related research and development work has not been reported yet.

Method used

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  • Thermally-reversible self-repairing electrostatic dissipation polyurethane membrane and production method thereof
  • Thermally-reversible self-repairing electrostatic dissipation polyurethane membrane and production method thereof
  • Thermally-reversible self-repairing electrostatic dissipation polyurethane membrane and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Preparation of hyperbranched polysiloxane with maleimide group

[0040] In N 2 Under the protection and magnetic stirring conditions, in a 250mL three-necked flask, 2.24g N-carbamoylmaleimide and 100mL toluene were thoroughly mixed; and then 3.584g γ-(2,3-epoxypropylene) was dropped into the three-necked flask. Oxygen) propyltrimethoxysilane. After the addition is complete, the three-neck flask is heated, and the reactants are reacted at a constant temperature of 50° C. for 6 hours. After the reaction, the solvent was distilled off under reduced pressure and dried under vacuum at room temperature to obtain the silanized N-carbamoyl maleimide. For its proton nuclear magnetic resonance spectrum, see attached figure 1 .

[0041] 0.2688 g of deionized water, 80 mL of ethanol and 0.01 g of tetramethylammonium hydroxide were added to the silanized N-carbamoyl maleimide, and then mixed thoroughly under stirring. Warm up to 50°C and react at constant temperature for 3 hours; a...

Embodiment 2

[0063] (1) Preparation of hyperbranched polysiloxane with maleimide group

[0064] In N 2 Under protection and stirring conditions, in a 250mL three-necked flask, 2.24g N-carbamoylmaleimide and 80mL toluene were thoroughly mixed; then 4.256g γ-(2,3-epoxypropoxylate) was dropped into the three-necked flask. ) Propyl trimethoxysilane. After the dripping was completed, the three-neck flask was heated to 55°C and reacted at a constant temperature for 7 hours. After the reaction, the solvent was distilled off under reduced pressure, and vacuum dried at room temperature to obtain silanized N-carbamoyl maleimide.

[0065] To the silanized N-carbamoyl maleimide, add 0.448g deionized water, 90mL ethanol, methanol, propanol, n-butanol mixture and 0.009g tetramethylammonium hydroxide, and under mechanical stirring conditions , Mix thoroughly. The temperature was raised to 50° C. and reacted at a constant temperature for 5 hours; after the reaction, the solvent was distilled off under reduc...

Embodiment 3

[0072] (1) Preparation of hyperbranched polysiloxane with maleimide group

[0073] In N 2 Under protection and stirring conditions, in a 250mL three-necked flask, 2.24g of N-carbamoylmaleimide and 90mL toluene were thoroughly mixed; then 3.607g of γ-(2,3-epoxypropoxylate) was dropped into the three-necked flask. ) Propyl trimethoxysilane. After the addition, the three-neck flask was heated to 60° C. and reacted at a constant temperature for 6 hours. After the reaction, the solvent was distilled off under reduced pressure, and dried under vacuum at 45° C. to obtain silanized N-carbamoyl maleimide.

[0074] To the silanized N-carbamoyl maleimide, add 0.2748 g of deionized water, 80 mL of ethanol, and 0.0091 g of a mixture of tetramethylammonium hydroxide and tetraethylammonium hydroxide, and under magnetic stirring, fully mixing. The temperature was raised to 55° C. and reacted at a constant temperature for 4 hours; after the reaction, the solvent was distilled off under reduced p...

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Abstract

The invention discloses a thermally-reversible self-repairing electrostatic dissipation polyurethane membrane and a production method thereof. The method comprises the following steps: uniformly mixing 4,4-diphenylmethane diisocyanate, polycaprolactone glycol and N,N-dimethyl formamide, reacting, cooling to a temperature being smaller than 5DEG C, adding 2-furanmethanamine, reacting, heating to 95-105DEG C, adding maleimido group-containing hyperbranched polysiloxane and functionalized carbon nanotubes, uniformly mixing, reacting the above obtained solution at 50-55DEG C to obtain a pre-finished product, pouring the pre-finished product into a die, and drying to obtain the thermally-reversible self-repairing electrostatic dissipation polyurethane membrane. A Diels-Alder (DA) reaction is used to realize thermal reversing and self repairing of the electrostatic dissipation polyurethane membrane; the electrostatic dissipation polyurethane membrane has the advantages of excellent thermal stability and electrostatic dissipation ability, and wide sources of raw materials; and the production method has the characteristics of simple process, strong practicality and extensive applicability.

Description

Technical field [0001] The invention relates to a static dissipative polymer-based composite material and a preparation method thereof, in particular to a thermoreversible self-repairing static dissipative polyurethane film and a preparation method thereof. Background technique [0002] Electrostatic breakdown is the phenomenon of discharge due to the accumulation of static electricity. In terms of electronic devices, static electricity accumulation and electrostatic breakdown effects can damage instruments and cause irreversible damage; in aerospace, static electricity accumulation and electrostatic breakdown effects can cause damage to aviation instruments and cause major accidents; in the coal industry, static electricity Accumulation and electrostatic breakdown effects can cause accidents such as explosions and fires. Static electricity accumulation and electrostatic breakdown have become one of the important factors related to people's safe production and life. Therefore, ...

Claims

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Application Information

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IPC IPC(8): C08L75/06C08G18/76C08G18/66C08G18/42C08G18/61C08K9/00C08K7/24C08J5/18C09D175/06C09D7/12C09D5/24
Inventor 梁国正付高辉顾嫒娟袁莉
Owner SUZHOU UNIV
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