Low-silver-loaded electromagnetic wave shielding fabric preparation method

An electromagnetic wave and fabric technology, applied in the fields of magnetic/electric field shielding, electrical components, textiles and papermaking, etc., can solve the problems of increased amount of silver plating on the surface, increased surface area of ​​fabrics, harmful to human body, etc., to achieve high electromagnetic wave shielding efficiency, The effect of low silver loading and high bond strength

Inactive Publication Date: 2009-12-30
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of the traditional electroless silver-plated shielding fabric, the fabric is 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, which has been banned in EU countries
Especially after NaOH corrosion, KMnO 4 , Sulfuric acid coarsens, which increases the surface area of ​​the fabric, leading to an increase in the amount of silver plated on the surface, that is, an increase in the silver loading, and as a result, the cost of silver-plated fabrics remains high

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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  • Low-silver-loaded electromagnetic wave shielding fabric preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Wash the brocade cloth with an area of ​​20 cm × 25 cm with deionized water, dry it, weigh 4 g, place it in a 0.01% ethanol solution of 3-aminopropyltrimethoxysilane, and soak it for 30 minutes, take it out, rinse it with ethanol, and dry it to get a nylon-polyester cloth with hydroxylated surface.

[0024] Arrange the surface hydroxylated nylon and polyester in the acetone solution of 1% 3-mercaptopropyltrimethoxysilane, soak for 60 minutes, take it out, rinse with ethanol, dry, weigh 4.01g, and get the surface Mercapto-polyester cloth.

[0025] Dissolve 4g of silver nitrate, 6mL of ammonia water, and 5g of sodium hydroxide in 500mL of deionized water, then dissolve 10g of sodium potassium tartrate in 500mL of deionized water. After the dissolution is completed, mix the above solutions and add deionized water until the volume of the solution is 1L. , to obtain silver electroless plating solution.

[0026] Under the action of ultrasonic waves, place the surface mercap...

Embodiment 2

[0028] The polyester cotton cloth with an area of ​​20 cm × 25 cm was washed with deionized water, dried, weighed 4.06 g, and placed in a solution of 1% 3-aminopropyltrimethoxysilane in isopropanol, Soak for 45 minutes, take it out, rinse with ethanol, and dry to obtain polyester-cotton cloth with hydroxylated surface.

[0029] The surface hydroxylated polyester cotton is arranged in a butanone solution with a concentration of 5% 3-mercaptopropyltriethoxysilane, soaked for 45 minutes, taken out, rinsed with ethanol, dried, and weighed 4.07g. Obtain surface mercapto-polyester-cotton cloth.

[0030] Dissolve 7g of silver nitrate, 3mL of ammonia water, and 4g of potassium hydroxide in 500mL of deionized water, then dissolve 6g of glucose in 500mL of deionized water, after the dissolution is completed, mix the above solutions, add deionized water until the volume of the solution is 1L, and obtain Silver electroless plating solution.

[0031] Under the action of ultrasonic waves,...

Embodiment 3

[0033]Wash a 20 cm × 25 cm polyester cloth with deionized water, dry it, weigh 4.03 g, and place it in a 5% 3-aminopropyltriethoxysilane butanol solution , soaked for 60 minutes, taken out, rinsed with ethanol, and dried to obtain surface hydroxylated polyester sticky cloth.

[0034] Arrange the hydroxylated polyester on the surface in a tetrahydrofuran solution of 0.01% 3-mercaptopropyltrimethoxysilane, soak for 30 minutes, take it out, rinse with ethanol, dry, weigh 4.04g, and obtain the surface Thiolated polyester viscose cloth.

[0035] Dissolve 12g of silver nitrate, 6mL of ammonia water, and 8g of sodium hydroxide in 500mL of deionized water, and then dissolve 15g of hydrazine hydrate in 500mL of deionized water. After the dissolution is completed, mix the above solutions and add deionized water until the volume of the solution is 1L. Silver electroless plating solution was obtained.

[0036] Under the action of ultrasonic waves, place the mercaptolated polyester on th...

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 material and relates to a low-silver-loaded electromagnetic wave shielding fabric preparation method, comprising the following specific steps: modifying the surface of polyester fabric, introducing an active group--sulphydryl under the premise of not increasing the surface area of the fabric, and then plating silver with ultrasonic wave; wherein, Ag-S chemical bond is formed between sulphydryl and silver so that the compactness of the silver coating and the adhesion force of the fabric substrate are increased; in the process of chemical plating, fresh plating solution is always on the surface of the fabric and the materials which are absorbed on the surface of the fabric through physical adsorption are removed timely owning to the action of ultrasonic wave so that the continuity and compactness of the silver coating can be improved further; the silver loading content of the prepared silver-loaded electromagnetic wave shielding fabric is 6.7-7.0% by weight; the fabric is more resistant to the corrosion of the air and water, the electromagnetic shielding effectiveness is more than 32dB in the range of 0.01-18GHz, namely the anti-electromagnetic radiation rate is more than 99.9%; the fabric can be widely used in electromagnetic wave antiradiation clothes and in the field of electromagnetic wave shielding for special departments such as military, national defense and the like.

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 low-silver-loaded electromagnetic wave shielding fabric. Background technique [0002] The continuous progress of modern industry and the rapid development of modern science and technology have promoted the wide application of various household appliances and electronic equipment. It has been scientifically proven that these household appliances and electronic devices will generate electromagnetic waves of different frequencies to varying degrees during use. These electromagnetic waves have become a new source of pollution, quietly eroding people's bodies, affecting people's health, and causing various diseases. Metal-coated fabrics can reflect, absorb, and offset electromagnetic waves, thereby reducing electromagnetic radiation. The types of metals to be plated mainly include aluminum, copper, nickel, gold ...

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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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/83D06M13/513H05K9/00D06M101/32
Inventor 吕银祥
Owner FUDAN UNIV
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