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Silicon dioxide aerogel based composite shielding layer and preparation method thereof

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

Active Publication Date: 2018-05-04
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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  • Silicon dioxide aerogel based composite shielding layer and preparation method thereof
  • Silicon dioxide aerogel based composite shielding layer and preparation method thereof
  • Silicon dioxide aerogel based composite shielding layer and preparation method thereof

Examples

Experimental program
Comparison scheme
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

The invention discloses a silicon dioxide aerogel based composite shielding layer material and a preparation method thereof. The preparation method comprises the following steps: soaking organic polyurethane foams into silicon dioxide ceramic slurry, performing vacuum soaking, taking out foams with the silicon dioxide ceramic slurry, uniformly extruding, drying, sintering, soaking into sol, adjusting the pH value, performing gelatination on the sol inside silicon dioxide foamed ceramic for 10 minutes to 3 hours, performing solvent exchange in absolute ethyl alcohol, and performing supercritical drying, thereby obtaining the silicon dioxide aerogel based composite shielding layer material. The composite shielding layer material is a high-strength light electromagnetic shielding material ofa micro-nano composite porous structure. Due to strong dense pore ribs in the silicon dioxide foamed ceramic, a good support property is achieved, the nano pore silicon dioxide aerogel among pore ribsis excellent in dielectric property of electromagnetic shielding, and the material has relatively good support strength for cores, is small in brittleness, is not liable to crack in the preparation process and is relatively good in dielectric property.

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 Applications(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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