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Waterborne polyurethane-MXene electromagnetic shielding bionic nanocomposite material film and preparation method

A water-based polyurethane and composite film technology, applied in the field of electromagnetic shielding materials, can solve problems such as poor mechanical properties and flexibility, and cannot be applied, and achieve the effects of broad application, diverse preparation methods, and controllable thickness.

Pending Publication Date: 2020-01-17
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, Ti 3 C 2 T x / Ti 2 CT x Based electromagnetic shielding composite materials are mainly foam, bulk and millimeter-scale films, which cannot be applied to emerging flexible electronics, wearable electronic devices and tiny electronic devices
At the same time, existing Ti 3 C 2 T x / Ti 2 CT x - The mechanical properties and flexibility of polymer electromagnetic shielding composite materials are also at a poor level

Method used

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  • Waterborne polyurethane-MXene electromagnetic shielding bionic nanocomposite material film and preparation method
  • Waterborne polyurethane-MXene electromagnetic shielding bionic nanocomposite material film and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1. Synthesis of WPU: Dry PTMEG (Mn=1000) in a vacuum oven at 100° C. for 10 h, take 0.020 mol of dried PTMEG and add it to a dry there-necked flask equipped with a mechanical stirring device, and set the stirrer speed to 100 rpm. Then 0.046mol of HDI was added dropwise, and the temperature was raised to 80°C for 3.5h; 0.0234mol of DMBA was dissolved in 5mL of anhydrous DMF, then added to the reaction system, and reacted at 80°C for 2.5h; the temperature of the system was lowered to 40°C, followed by Add 0.0234 mol of triethylamine, react for 15 minutes, adjust the stirring speed to 3000 rpm, add 75 mL of deionized water, emulsify and disperse for 20 minutes, and obtain WPU emulsion.

[0035] Step 2. Preparation of WPU-MXene composite dispersion: Dilute WPU with deionized water into an emulsion with a mass fraction of 0.3%; then add Ti 3 C 2 T x MXene was formulated into an aqueous dispersion with a mass fraction of 0.6%; the WPU and Ti 3 C 2 T x The mass rat...

Embodiment 2

[0037] Embodiment 2: the synthesis of the WPU of step 1 is replaced with following:

[0038] Step 1. Synthesis of WPU: Dry PTMEG (Mn=2000) in a vacuum oven at 110° C. for 10 h, take 0.020 mol of dried PTMEG and add it to a dry three-necked flask equipped with a mechanical stirring device, and set the stirrer speed to 100 rpm. Then add 0.04mol of TDI dropwise, raise the temperature to 65°C for 2 hours; dissolve 0.02mol of DMPA in 5mL of anhydrous DMF, then add to the reaction system, react at 70°C for 2h; cool the system to 40°C, then add 0.018 mol of triethylamine, after reacting for 15 minutes, adjust the stirring speed to 2000 rpm, add 75 mL of deionized water to it, and emulsify and disperse for 30 minutes to obtain WPU emulsion.

Embodiment 3

[0039] Embodiment 3: the synthesis of the WPU of step 1 is replaced with following:

[0040] Dry PTMEG (Mn=650) in a vacuum oven at 90°C for 12 hours, take 0.020 mol of dried PTMEG and add it to a dry three-necked flask equipped with a mechanical stirring device, set the stirrer speed to 100 rpm, and then dropwise add 0.03 mol of IPDI , the temperature was raised to 80°C for 3 hours; 0.012mol of DMBA was dissolved in 5mL of anhydrous NMP, then added to the reaction system, and reacted for 3h at 85°C; the temperature of the system was lowered to 30°C, and then 0.013mol of triethanolamine was added to react After 30 minutes, the stirring speed was adjusted to 3000 rpm, 75 mL of deionized water was added thereto, emulsified and dispersed for 20 minutes, and WPU emulsion was obtained.

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Abstract

The invention relates to a waterborne polyurethane-MXene electromagnetic shielding bionic nanocomposite film and a preparation method. Through pre prepolymeriztion reaction of polytetrahydrofuran gl and diisocyanate and chain extension by a hydrophilic chain extender, then a neutralizing agent is added, subsequently, deionized water is added for emulsification dispersion to obtain a waterborne polyurethane emulsion; waterborne polyurethane and MXene are prepared into water dispersion liquid, MXene is added to the waterborne polyurethane under stirring, continuous stirring is carried out to enable waterborne polyurethane macromolecules to be fully and uniformly adsorbed on MXene nanosheets. And waterborne polyurethane-MXene composite dispersion liquid is obtained; and a series of nanocomposite films are prepared by a vacuum filtration method, a solvent evaporation method or a coating method. The prepared nanocomposite thin films have ordered "brick-wall" structures in a bionic shell layer shape on the micro and nano scales, the mechanical properties are excellent, the flexibility is good, the electromagnetic shielding effectiveness is excellent, preparation methods are diverse, thethickness is controllable, and application is wide.

Description

technical field [0001] The invention belongs to the field of electromagnetic shielding materials, and relates to a water-based polyurethane-MXene electromagnetic shielding biomimetic nanocomposite film and a preparation method thereof. Preparation. Background technique [0002] With the vigorous development of wireless electronic equipment, electromagnetic radiation has become a kind of pollution that cannot be ignored. It not only affects people's health, but also has a certain impact on the normal operation of electronic equipment. Materials with high electromagnetic shielding effectiveness can effectively solve this pollution problem. One of the prerequisites for being a magnetic shielding material is excellent electrical conductivity, since impedance mismatches can cause incident electromagnetic waves to be reflected back by conductive materials. The electromagnetic shielding materials used in the early years are usually metal materials, but the disadvantages of high d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/08C08K3/16C08K3/22C08J5/18C08G18/10C08G18/48C08G18/66C08G18/34
CPCC08G18/10C08G18/4854C08G18/6692C08J5/18C08J2375/08C08K3/16C08K3/22C08K2201/001C08K2201/011C08G18/348
Inventor 张秋禹刘宗旭朱苞蕾
Owner NORTHWESTERN POLYTECHNICAL UNIV
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