Preparation method of isolated thermoplastic elastomer composite microporous electromagnetic shielding material

A thermoplastic elastomer, electromagnetic shielding material technology, applied in the fields of magnetic/electric field shielding, electrical components, bulk chemical production, etc. The problem of increasing the stiffness of polymer matrix composites has achieved the effect of improving electromagnetic shielding efficiency, good application prospects, and simple and efficient preparation methods.

Active Publication Date: 2020-08-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the effective concentration of conductive particles forming a conductive network does not change substantially during the foaming process, it is still difficult to form an efficient conductive network, and the improvement of conductivity and electromagnetic shielding effectiveness is limited.
Moreover, the addition of a large amount of conductive filler not only increases the number of defects in the matrix, but also increases the rigidity of the polymer-based composite material, resulting in a greatly reduced foaming ability of the polymer-based composite material.

Method used

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  • Preparation method of isolated thermoplastic elastomer composite microporous electromagnetic shielding material
  • Preparation method of isolated thermoplastic elastomer composite microporous electromagnetic shielding material

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preparation example Construction

[0024] A method for preparing an isolated thermoplastic elastomer composite microporous electromagnetic shielding material of the present invention specifically comprises the following steps:

[0025] Step 1: Add 1-2g of MAX-phase ceramic powder with a mesh size of 200-400 to a mixed solution of 20-40mL hydrochloric acid and 1-2g lithium fluoride, stir at 35°C for 24 hours to obtain a black solution, wash, centrifuge and ultrasonicate Stripped to get dark green Ti 3 C 2 T x MXene aqueous dispersion; Ti 3 C 2 T x Ti in MXene aqueous dispersion 3 C 2 T x The size of the MXene sheet is 100-300nm, and the concentration of the dispersion is 5-20mg / mL;

[0026] Step 2, place the thermoplastic elastomer beads in a supercritical CO 2 Carry out saturated absorption in an autoclave for 3-6 hours, the saturation temperature is 35-60°C, the saturation pressure is 8-20MPa, and then the fully saturated thermoplastic elastomer beads are placed in a high-temperature foaming device...

Embodiment 1

[0031] Weigh Ti with a concentration of 5 mg / mL 3 C 2 T x MXene aqueous dispersion 10mL, ultrasonic dispersion uniform; nylon 66 thermoplastic elastomer beads placed in a critical CO 2 Carry out saturated absorption in an autoclave for 3 hours, the saturation temperature is 35°C, and the saturation pressure is 8MPa, and then the fully saturated thermoplastic elastomer beads are placed in a high-temperature oil bath for microcellular foaming, and the foaming temperature is 100°C. The foaming time was 5s to obtain nylon 66 microporous foam beads; the microporous foam beads were immersed in Ti 3 C 2 T x MXene aqueous dispersion, after taking it out, place it in a 30°C oven for drying to obtain Ti 3 C 2 T x MXene-wrapped nylon 66 thermoplastic elastomer composite microporous beads; the resulting Ti 3 C 2 T x MXene-wrapped thermoplastic elastomer composite microporous beads were placed in the mold, poured formic acid at a temperature of 30°C to dissolve the surface of...

Embodiment 2

[0033] Weigh Ti at a concentration of 10mg / mL 3 C 2 T x MXene aqueous dispersion 10mL, ultrasonic dispersion uniform; nylon 66 thermoplastic elastomer beads placed in a critical CO 2 Carry out saturated absorption in an autoclave for 4 hours, the saturation temperature is 40°C, and the saturation pressure is 10MPa, and then the fully saturated thermoplastic elastomer beads are placed in a high-temperature oil bath for microcellular foaming, and the foaming temperature is 120°C. The foaming time was 15s to obtain nylon 66 microporous foam beads; the microporous foam beads were immersed in Ti 3 C 2 T x The aqueous MXene dispersion was taken out and placed in an oven at 40°C for drying to obtain Ti 3 C 2 T x MXene-wrapped nylon 66 thermoplastic elastomer composite microporous beads; the resulting Ti 3 C 2 T x MXene-wrapped thermoplastic elastomer composite microporous beads were placed in the mold, poured formic acid at a temperature of 40°C to dissolve the surface ...

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Abstract

The invention discloses a preparation method of an isolated thermoplastic elastomer composite microporous electromagnetic shielding material. The preparation method specifically comprises the following steps: 1, adding MAX-phase ceramic powder into a hydrochloric acid / lithium fluoride mixed solution to obtain a dark green aqueous dispersion; 2, placing the thermoplastic elastomer beads in an autoclave for saturated absorption, then carrying out microcellular foaming on the completely saturated thermoplastic elastomer beads in a high-temperature foaming device to obtain thermoplastic elastomermicrocellular foamed beads with different foaming ratios; 3, immersing the thermoplastic elastomer microcellular foamed beads into the aqueous dispersion to obtain wrapped thermoplastic elastomer composite microcellular beads; and 4, putting the wrapped thermoplastic elastomer composite microporous beads into a mold, and pouring formic acid to dissolve the surfaces of the composite microporous beads, thereby obtaining the isolated thermoplastic elastomer composite microporous electromagnetic shielding material. The prepared electromagnetic shielding material has the advantages of light weight,low filling, high electromagnetic shielding efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer-based electromagnetic shielding composite materials, and relates to a preparation method of an isolated thermoplastic elastomer composite microporous electromagnetic shielding material. Background technique [0002] The rapid development of the electronic industry has made the size of electronic devices and communication equipment smaller and smaller, the integration level is higher and higher, and the electromagnetic wave emission power is higher and higher. Electromagnetic waves emitted by electronic devices and communication equipment not only affect the normal operation of their own equipment and other equipment, but may also have adverse effects on the human body and the natural environment. In recent years, with the rapid development of the 5G industry, problems such as electromagnetic radiation, electromagnetic pollution, and information leakage caused by electromagnetic waves have become i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C08J9/12C08L77/06C08K7/00H05K9/00B29C43/00B29C43/02B29C44/34
CPCC08J9/40C08J9/122C08K7/00H05K9/0083B29C43/003B29C43/02B29C44/3403C08J2377/06C08J2203/06C08J2203/08Y02P20/54
Inventor 马忠雷张宇康松磊马建中邵亮向小莲魏阿静张梦辉
Owner SHAANXI UNIV OF SCI & TECH
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