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A kind of silica airgel-based composite shielding layer and preparation method thereof

A composite shielding layer and silicon dioxide technology, which is applied in the direction of ceramic products, electrical components, and other household appliances, can solve the problems of high brittleness, low strength of pure silica airgel, and easy cracking, and achieve good supporting performance , density increase, and the effect of improving structural strength

Active Publication Date: 2020-12-15
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of the shielding layer must meet the size requirements such as small cross-section and high aspect ratio, and must have a certain supporting strength to fix the position of the core wire; while pure silica airgel has extremely low strength, excessive brittleness, and easy preparation process. Cracking; it is difficult to directly use silica airgel as a shielding layer

Method used

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  • A kind of silica airgel-based composite shielding layer and preparation method thereof
  • A kind of silica airgel-based composite shielding layer and preparation method thereof
  • A kind of silica airgel-based composite shielding layer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] 1) Put 10 ppi of polyurethane foam in a NaOH solution with a mass concentration of 10%, and treat it in a water bath at 60° C. in a constant temperature water bath for 3 hours. After taking it out, rub it repeatedly to remove the film between the tendons of the organic foam, and repeatedly rinse and dry it with deionized water to obtain a pretreated organic foam; then immerse the pretreated organic foam in a 5% polyvinyl alcohol solution for 12 hours Take out and dry afterward, obtain organic polyurethane foam;

[0034] 2) 50g of SiO with an average particle size of 500nm 2 Mix the micropowder with 75mL of deionized water, add 1.5g of boric acid, then add 1g of carboxymethyl fiber and 5mL of ammonium polyacrylate, stir and dissolve at a high speed and mix evenly to obtain a silica ceramic slurry;

[0035] 3) Immerse the 10ppi organic polyurethane foam treated in step 1) completely in step 2) in the stirred silica ceramic slurry, within 4 Treat under a vacuum of Pa for ...

Embodiment 2

[0041] 1) Put 20ppi polyurethane foam in a NaOH solution with a mass concentration of 15%, and treat it in a water bath at 60° C. for 1 hour. After taking it out, fully rub the film between the tendons of the organic foam, rinse it with deionized water several times, and dry it to obtain the pretreated organic foam; then immerse the pretreated organic foam into a polyvinyl alcohol solution with a mass fraction of 5%, Take out and dry after 15h, obtain organic polyurethane foam;

[0042] 2) 100g of SiO with an average particle size of 200nm 2 Mix the micropowder with 100mL of deionized water, add 3.6g of boric acid, then add 1g of carboxymethyl fiber and 10mL of ammonium polyacrylate, stir at high speed to dissolve and mix evenly to obtain a silica ceramic slurry;

[0043] 3) fully immerse the 20ppi organic polyurethane foam treated in step 1) into the silicon dioxide ceramic slurry stirred in step 2), and within 4 Treat under vacuum of Pa for 20 minutes to remove air bubbles ...

Embodiment 3

[0049] 1) Put 10 ppi of polyurethane foam in a NaOH solution with a mass concentration of 20%, and treat it in a water bath at 40° C. for 2 hours. After taking it out, rub it repeatedly to remove the film between the tendons of the organic foam, and repeatedly rinse and dry it with deionized water to obtain the pretreated organic foam; then immerse the pretreated organic foam in a polyvinyl alcohol solution with a mass fraction of 5% for 20 hours. Take out and dry to obtain organic polyurethane foam;

[0050] 2) 50g of SiO with an average particle size of 500nm 2 Mix the micropowder with 100mL of deionized water, add 2g of boric anhydride, then add 2g of carboxymethyl fiber and 5mL of ammonium polyacrylate, stir at high speed to dissolve and mix evenly to obtain a silica ceramic slurry;

[0051] 3) Immerse the 10ppi organic polyurethane foam treated in step 1) completely in step 2) in the stirred silica ceramic slurry, within 4 Treat under vacuum of Pa for 20 minutes to remov...

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Abstract

A silica airgel-based composite shielding layer material and a preparation method thereof. The organic polyurethane foam is immersed in silica ceramic slurry, and after vacuum impregnation, the foam hanging with silica ceramic slurry is taken out and uniformly extruded After drying, sintering, and then immersing in the sol, after adjusting the pH value, the sol in the silica foam ceramics is gelled for 10 minutes to 3 hours, and then the solvent is exchanged in absolute ethanol and then supercritically dried to obtain silica gas. Gel based composite shielding material. The composite shielding layer material is a high-strength and lightweight electromagnetic shielding material with a micro-nano composite pore structure. The strong and dense ribs in the silica foam ceramics provide good support, and the nanoporous silica airgel filled between the ribs achieves excellent dielectric properties for electromagnetic shielding. Support strength, low brittleness, not easy to crack during the preparation process, and has good dielectric properties.

Description

technical field [0001] The invention relates to a novel material preparation technology of a micro-nano hole composite structure of silica, in particular to a silica airgel-based composite shielding layer material and a preparation method thereof. Background technique [0002] The communication cable is composed of copper core, cable core tape layer, shielding layer and outer protective sheath. The shielding layer is located between the protective sleeve and the tape layer, mainly to shield the interference of external electromagnetic waves and avoid the conduction between the inner copper core and the outer copper tube. Silica airgel has low thermal conductivity and refractive index, strong insulating ability, small dielectric constant, low dielectric loss, high temperature resistance, and excellent radiation resistance. Therefore, the preparation of silica airgel as the shielding layer of communication cables has significant advantages in application environments such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/14C04B35/622H01B7/22
CPCC04B35/14C04B35/622C04B38/0615C04B2235/77C04B2235/96H01B7/225C04B38/0067
Inventor 李红伟黎盛忠逯攀岩张海岳桑可正
Owner CHANGAN UNIV
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