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Preparation method of copper-clad electromagnetic wave shielding fabric

An electromagnetic wave and fabric technology, which is applied in shielding, liquid chemical plating, textiles and papermaking, etc., can solve problems such as limited application range, reduced shielding efficiency, and short service life, and achieves simple and environmentally friendly process flow, high electromagnetic wave shielding efficiency, The effect of high bond strength

Inactive Publication Date: 2009-09-16
TAICANG BIQI NEW MATERIAL RES & DEV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this kind of fabric is that it has poor washability, cannot be folded repeatedly, and the metal wire is easy to break, which limits its application range.
(2) Coating a conductive layer on the surface of the fabric, such as silver glue or other conductive polymer coatings (Ni Qiang, etc., CN101086904); the electromagnetic wave radiation protection rate of this type of fabric is similar to (1), and it can be folded, but its washability Worse, products based on this fabric are generally indicated as non-washable
(3) Place the fabric under high vacuum for evaporation (Lin Lei et al. CN201174256), which is more common in the packaging industry and is suitable for "roll-to-roll" continuous production. The surface conductivity of the fabric is similar to that of metal and has a higher The electromagnetic wave radiation protection rate; but its biggest disadvantage is that the metal coating layer is easy to fall off, the product performance declines quickly, and the service life is short
(4) fabric is placed in the solution, in fabric surface chemical plating metal layer, obtains electromagnetic wave shielding fabric (Liu Shaozhi etc., CN1236839; Li Di, CN1130223; Zhao Zeqing etc., CN1710156; Xu Rugen etc., CN101325864), this is the most effective at present method; but this type of fabric has to be corroded by NaOH, KMnO 4 , Sulfuric acid coarsening, SnCl 2 Sensitization, PdCl 2 Catalysis and formaldehyde or hypophosphite reduction steps, the disadvantages are: NaOH corrosion reduces the weight of the fabric by 15% to 30%; residual Sn in the fabric 2+ Ions are harmful to the human body; PdCl 2 It is a noble metal salt, the use cost is high, and the residual Pd 2+ It can promote the oxidation of the coating in the air; formaldehyde is a toxic reducing agent, and its use has been banned in EU countries. If hypophosphite is used, for copper plating, it needs to go through Ni 2+ Catalyzed, Cu-Ni-P alloy is obtained, which reduces the shielding effectiveness of the fabric
The fabric prepared by method (4) has certain washability and can be washed about 5 times conventionally, but after washing in an ultrasonic cleaner, its shielding effectiveness drops to about 20dB

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Preparation method of copper-clad electromagnetic wave shielding fabric

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Wash the Nylon polyester cloth with a weight of 4g and an area of ​​20 cm × 25 cm with deionized water, dry it, and place it in 0.01% 3-(2-aminoethyl)-aminopropyltrimethoxysilane in ethanol solution, soak for 25 minutes, take it out, rinse with ethanol, and dry to obtain nylon-polyester cloth with surface hydroxylation.

[0020] Arrange the surface hydroxylated nylon and polyester in the acetone solution with a concentration of 1% 2-mercaptoethyltrimethoxysilane, soak for 60 minutes, take it out, rinse with ethanol, and dry to obtain the surface mercaptolated nylon and polyester cloth .

[0021] Dissolve 4g of copper sulfate, 10g of sodium potassium tartrate, 8g of sodium citrate, 6g of sodium borohydride, 6g of boric acid, and 1.5g of sodium hydroxide in 500mL of deionized water. After the dissolution is completed, add deionized water until the volume of the solution is 1L, to obtain Copper electroless plating solution.

[0022] Arrange the mercapto-coated brocade an...

Embodiment 2

[0024] Wash the polyester cotton cloth with a weight of 4 g and an area of ​​20 cm × 25 cm with deionized water, dry it, and place it in 0.1% 3-(2-aminoethyl)-aminopropyltriethoxysilane in methanol solution, soak for 5 minutes, take it out, rinse with ethanol, and dry to obtain polyester-cotton cloth with surface hydroxylation.

[0025] Arrange the surface-hydroxylated polyester cotton in a cyclohexanone solution with a concentration of 0.01% 2-mercaptoethyltriethoxysilane, soak for 60 minutes, take it out, rinse with ethanol, and dry to obtain the surface-mercaptolated polyester cotton. Polyester cotton.

[0026] Dissolve 6g of copper sulfate, 8g of sodium potassium tartrate, 10g of sodium citrate, 5g of sodium borohydride, 3g of boric acid, and 1g of sodium hydroxide in 500mL of deionized water. After the dissolution is complete, add deionized water until the volume of the solution is 1L to obtain copper Electroless plating solution.

[0027] Arrange the mercapto-coated po...

Embodiment 3

[0029] Wash a polyester cloth with a weight of 4 g and an area of ​​20 cm × 25 cm with deionized water, dry it, place it in a 0.5% ethylene glycol solution of 3-aminopropyltrimethoxysilane, soak it After 15 minutes, take it out, rinse it with ethanol, and dry it to get a hydroxylated polyester cloth.

[0030] Arrange the surface hydroxylated polyester in a tetrahydrofuran solution of 5% 3-mercaptopropyltriethoxysilane, soak for 45 minutes, take it out, rinse with ethanol, and dry to obtain the surface mercaptolated polyester cloth.

[0031] Dissolve 5g of copper sulfate, 9g of sodium potassium tartrate, 8g of sodium citrate, 6g of sodium borohydride, 5g of boric acid, and 2g of sodium hydroxide in 500mL of deionized water; Electroless plating solution.

[0032] Arrange the mercapto-coated polyester cloth in the above-mentioned plating solution, and chemically plate it at 40°C for 4 hours, take it out, wash it with water, and dry it to obtain a copper-clad polyester cloth, we...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention belongs to the technical field of electromagnetic wave shielding materials, and relates to a preparation method for copper-clad electromagnetic wave shielding fabric. The method comprises the following steps of: carrying out hydroxylation, sulfhydrylation and then chemical copper plating on the surface of polyester fabric and obtaining the electromagnetic wave shielding fabric; after the prepared electromagnetic wave shielding fabric is washed by an ultrasonic washing machine, the weight of the fabric is not changed, which shows that the copper plated on the surface and the fabric have good adhesivity, namely the fabric has strong washability; the washed fabric is in the range of 0.01MHz to 18GHz; and the efficiency of the electromagnetic wave shielding is larger than 54dB, namely the rate of radiation protection of the electromagnetic wave is larger than 99.999 percent. The fabric can be widely used for electromagnetic wave radiation-proof clothes and electromagnetic wave shielding of special departments including aviation, aerospace, military industry and communication, etc.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave shielding materials, and in particular relates to a preparation method of a copper-clad electromagnetic wave shielding fabric. Background technique [0002] Electromagnetic wave radiation is called by the World Health Organization as the fourth largest global public hazard after water, air, and noise, and has become an invisible "killer" that endangers human beings. A large number of facts have proved that long-term exposure to electromagnetic radiation can lead to headaches, dizziness, memory loss, neurological disorders and other symptoms. On the other hand, the ubiquitous electromagnetic waves can easily interfere with the operation of high-precision instruments and affect the normal progress of scientific experiments. Conductive metals can reflect, absorb, and offset electromagnetic waves, thereby reducing electromagnetic radiation. Electromagnetic wave shielding fabric is a com...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): D06M13/507C23C18/40G12B17/02D06M101/32
Inventor 吕银祥
Owner TAICANG BIQI NEW MATERIAL RES & DEV
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