CN212800226U

CN212800226U - Electromagnetic shielding cloth

Info

Publication number: CN212800226U
Application number: CN202021480067.7U
Authority: CN
Inventors: 林占富
Original assignee: Dongguan Xiankang Electronic Technology Co ltd
Current assignee: Dongguan Xiankang Electronic Technology Co ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2021-03-26
Anticipated expiration: 2030-07-24

Abstract

The utility model discloses an electromagnetic shielding cloth, including the base cloth layer, the upper and lower surface coating on base cloth layer has first electromagnetic shield layer and second electromagnetic shield layer, and the surface coating on first electromagnetic shield layer has first electrically conductive copper cloth layer, and the surface coating on second electromagnetic shield layer has electrically conductive copper cloth layer of second, and the surface on first electrically conductive copper cloth layer is equipped with silver-colored conductive film, and the surface on electrically conductive copper cloth layer of second is equipped with acrylic acid pressure sensitive adhesive glue layer. The vacuum plating process is adopted, so that the generation of sewage is effectively reduced, the environmental pollution is reduced, the cost is reduced, the efficiency is improved, the glue permeation to the surface is avoided in the using process, the first electromagnetic shielding layer and the second electromagnetic shielding layer are prevented from being oxidized, and the superior performance is kept.

Description

Electromagnetic shielding cloth

Technical Field

The utility model relates to an electromagnetic shielding cloth technical field specifically is an electromagnetic shielding cloth.

Background

With the continuous development of the technology level, 3C products such as notebook computers, GPS, IPAD and mobile phones have become an indispensable part of people's daily life, and they bring convenience to our life and also pose hidden dangers to people's health. These electronic products emit high frequency electromagnetic waves when used, and if a human body is exposed to strong electromagnetic waves for a long time, the health of the body is affected, and even cancer lesions are induced. In addition, as the working field environment of modern electronic products is increasingly complex, and many electronic products are complex systems with a mixture of digital and analog systems, the damage of electromagnetic radiation from the outside of the products and electromagnetic interference between internal systems, transmission channels and internal components to various useful information of the products has seriously threatened the stability, reliability and safety of the products, so that the prevention of electromagnetic interference has become one of the more and more focuses of people.

The existing electromagnetic shielding cloth has low porosity, low protective performance, limited application range, low corrosion resistance, low wear resistance, low gloss and aesthetic property, short service life, low durability, weak binding force of a plating layer, poor reflection capability, inconvenience in fixed installation and easy performance attenuation caused by oxidation of a surface nickel layer.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The utility model provides a not enough to prior art, the utility model provides an electromagnetic shield cloth has solved current electromagnetic shield cloth porosity and has hanged down, and barrier propterty is low, and the range of application limits, and corrosion resistance is low, and the wearability is low, and gloss and aesthetic property are low, and life is short, and is not durable, and cladding material cohesion is weaker, and the reflective capacity is relatively poor, inconvenient fixed mounting, the easy problem that leads to the performance decay of oxidation of surface nickel layer.

(II) technical scheme

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides an electromagnetic shielding cloth, includes the substrate cloth layer, the upper and lower surface coating on substrate cloth layer has first electromagnetic shield layer and second electromagnetic shield layer, and the surface coating on first electromagnetic shield layer has first electrically conductive copper cloth layer, and the surface coating on second electromagnetic shield layer has the electrically conductive copper cloth layer of second, and the surface on first electrically conductive copper cloth layer is equipped with the silver-colored conducting film, and the surface on second electrically conductive copper cloth layer is equipped with acrylic acid pressure sensitive adhesive glue layer.

Preferably, the base material cloth layer is a blended cloth of aramid fibers and polyamide fibers, the blended cloth is formed by crosswise weaving warps and wefts, and a plain weave structure or a twill weave structure is arranged between the warps and the wefts.

Preferably, the first electromagnetic shielding layer and the second electromagnetic shielding layer are nickel plating layers or aluminum plating layers.

Preferably, the silver conductive film is an aluminum paste coating. In order to ensure the electromagnetic shielding effect and control the cost, the nickel plating layer is formed by one-time plating in a vacuum aluminum plating mode, the thickness range of the nickel plating layer is 2-5 mu m, and meshes of the base material cloth layer are required to be ensured not to be blocked so as to ensure good air permeability; the first conductive copper cloth layer and the second conductive copper cloth layer are thinner than the first electromagnetic shielding layer and the second electromagnetic shielding layer respectively, and only one layer is plated, and the thickness range is 0.4-0.6 mu m.

Preferably, the nickel plating layer is in a vacuum aluminum plating mode, and the thickness range is 0.4-5 μm.

The manufacturing method of the electromagnetic shielding cloth comprises the following steps:

step A: preparing a base cloth layer;

and B, step: vacuum plating nickel layer on the base material cloth layer to form a first nickel plating layer and a second nickel plating layer,

vacuum plating is a physical deposition phenomenon. Namely, argon is injected in a vacuum state, the argon impacts a target material, and the target material is separated into molecules which are adsorbed by a conductive goods to form a uniform and smooth surface layer. In order to meet the requirements of being safer, more energy-saving, noise-reducing and pollutant-discharging-reducing, vacuum plating has become a new environmental-friendly trend in surface treatment technology. Different from general electroplating, vacuum electroplating is more environment-friendly, and mainly comprises vacuum evaporation, sputtering and ion plating.

Depositing copper layers on the nickel layers on the surfaces of the first nickel plating layer and the second nickel plating layer by using a magnetron sputtering method to form a first conductive copper cloth layer and a second conductive copper cloth layer;

d, stirring and grinding 70-80% of PU polyurethane resin, 15-28% of aluminum silver powder, 1-3% of black toner and 0.5-2.5% of yellow toner to prepare aluminum silver paste;

e, uniformly coating aluminum paste on the first conductive copper cloth layer by using a scraper, heating at 120 ℃ for 120 seconds, and curing to form a stable silver conductive film with silver luster, wherein the first conductive copper cloth layer is protected for use;

step F, stirring 90-95% of acrylic pressure-sensitive adhesive, 3-8% of nickel powder, 0.8-2% of black toner and 0.7-1.8% of yellow toner to prepare acrylic pressure-sensitive adhesive glue;

and G, selecting release paper, coating acrylic acid pressure-sensitive adhesive glue with the thickness of 0.5-100 micrometers on the release paper, then adhering the release paper with the acrylic acid pressure-sensitive adhesive glue on the surface of the second conductive copper cloth, baking for 2 minutes by using an oven at 110 ℃, forming a self-adhesive conductive adhesive film on the surface of the second conductive copper cloth to enable the electromagnetic shielding cloth to be self-adhesive, tearing the release paper, adhering the electromagnetic cloth inside an electronic product to conduct electricity, having a good electromagnetic shielding function, and being used for electronic products, military products and the like.

(III) advantageous effects

The utility model provides an electromagnetic shielding cloth. The method has the following beneficial effects:

this electromagnetic shielding cloth, through the electroplated nickel layer that sets up, the porosity is high, mainly be used as the decorative cladding material of protection, the range of application is wide, prevent corroding, increase wearability, gloss and aesthetic property, through the electroplated copper layer that sets up, be used for improving cladding material cohesion, and is sturdy and durable, long service life, through the silver-aluminum thick liquid coating that sets up at the electroplated copper layer outside end, excellent light reflectance ability and metallic luster have, do not dissolve in water based paint, through the silvery rubber coating that sets up, it is fixed to be convenient for direct bonding, the surface nickel layer is difficult for being oxidized, and is durable.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the cloth layer structure of the base material of the present invention;

in the figure, 1, a base material cloth layer; 2. a first electromagnetic shield layer; 3. a second electromagnetic shield layer; 4. a first conductive copper layer; 5. a first conductive copper layer; 6. a conductive film; 7. a nylon fiber layer; 8. a polyester fiber layer; 9. an aluminum foil layer; 10, an ultraviolet-proof layer; 11. an acrylic pressure sensitive adhesive glue layer; 12 release paper.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, an embodiment of the present invention provides a technical solution: the utility model provides an electromagnetic shielding cloth, includes substrate cloth layer 1, the upper and lower surface coating on substrate cloth layer 1 has first electromagnetic shield layer 2 and second electromagnetic shield layer 3, and the surface coating of first electromagnetic shield layer 2 has first electrically conductive copper cloth layer 4, and the surface coating of second electromagnetic shield layer 3 has second electrically conductive copper cloth layer 5, and the surface of first electrically conductive copper cloth layer 4 is equipped with silver-colored conductive film 6, and the surface of second electrically conductive copper cloth layer 5 is equipped with acrylic acid pressure sensitive adhesive glue layer 11.

Preferably, substrate cloth layer 1 from top to bottom covers in proper order and has closed nylon fiber layer 7, polyester fiber layer 8, aluminium foil layer 9 and anti ultraviolet layer 10, nylon fiber layer 7, polyester fiber layer 8 are alternately woven by warp and weft and are formed the blended fabric structure, be plain weave structure or twill weave structure between warp and the weft.

Preferably, the first electromagnetic shielding layer 2 and the second electromagnetic shielding layer 3 are nickel plating or aluminum plating.

Preferably, the silver conductive film 6 is an aluminum silver paste coating. In order to ensure the electromagnetic shielding effect and control the cost, the nickel plating layer is formed by one-time plating in a vacuum aluminum plating mode, the thickness range of the nickel plating layer is 2-5 mu m, and the meshes of the base material cloth layer 1 are required to be ensured not to be blocked so as to ensure good air permeability; the first conductive copper cloth layer 4 and the second conductive copper cloth layer 5 are thinner than the first electromagnetic shielding layer 2 and the second electromagnetic shielding layer 3, respectively, and are plated with only one layer, and the thickness range is 0.4-0.6 μm.

step A: preparing a base cloth layer 1;

and B, step: a nickel layer is electroplated on the base material cloth layer 1 in vacuum to form a first nickel plating layer and a second nickel plating layer (a first electromagnetic shielding layer 2 and a second electromagnetic shielding layer 3),

Depositing copper layers on the nickel layers on the surfaces of the first nickel plating layer and the second nickel plating layer by using a magnetron sputtering method to form a first conductive copper cloth layer 4 and a second conductive copper cloth layer 5;

d, mixing 70-80% of PU polyurethane resin, 1-3% of black toner and 0.5-2.5% of yellow toner, adding 15-28% of aluminum powder under the stirring of 5000-7000 rpm, stirring for 10-20 minutes until the aluminum powder is uniformly dispersed visually, mixing and dispersing in a ball mill for 30-40 minutes, and then ultrasonically dispersing for 6-8 minutes to obtain uniform slurry; vacuum defoaming the slurry under the vacuum degree of 0.06-0.09MPa for 6-9 min, and grinding and rolling in a three-roll mill until the viscosity of the silver paste is 10000-20000 centipoises to obtain the aluminum silver paste;

the compatibility of the PU polyurethane resin and the aluminum silver powder and the dispersibility of the aluminum silver powder in the liquid PU polyurethane resin are higher. The utility model discloses the aluminium silver thick liquid granularity of preparation is little, the glossiness is high, strong corrosion resistance, wettability are good, have established the basis for promoting aluminium silver thick liquid's knife coating adaptability. The formed aluminum silver paste layer has good elasticity at normal temperature, and the elongation rate of the aluminum silver paste layer reaches over 100 percent even at the low temperature of minus 10 ℃, so the aluminum silver paste layer has good elasticity at normal temperature and low temperature.

E, uniformly coating aluminum paste on the first conductive copper cloth layer 4 by using a scraper, heating at 120 ℃ for 120 seconds, and curing to form a stable silver conductive film 6 with silver luster, so as to protect the first conductive copper cloth layer 4;

g, selecting release paper 12, coating acrylic acid pressure-sensitive adhesive glue (acrylic acid pressure-sensitive adhesive glue water layer 11) with the thickness of 0.5-100 microns on the release paper 12, then adhering the release paper 12 with the acrylic acid pressure-sensitive adhesive glue on the surface of second conductive copper cloth (second conductive copper cloth layer 5), baking for 2 minutes by using an oven at 110 ℃, forming a self-adhesive conductive adhesive film on the surface of the second conductive copper cloth (second conductive copper cloth layer 5), enabling the electromagnetic shielding cloth to be self-adhesive, tearing the release paper 12, and adhering the electromagnetic cloth on the electronic product

The utility model discloses a vacuum plating technology effectively reduces sewage and produces, reduces environmental pollution, and reduce cost, efficiency improves, avoids the oozing to the surface in the use, and first electromagnetic shield layer 2 and second electromagnetic shield layer 3 prevent to be by the oxidation, keep superior performance.

The working principle is as follows: the electroplated nickel layer 3 has high porosity, wide application range, corrosion prevention, wear resistance, gloss and aesthetic property, the electroplated copper layer 4 is a pre-plating layer which is most widely used in the electroplating industry and is used for improving the bonding force of the plating layer, and is firm and durable, the service life is long, the electroplated copper layer 4 is an important component of a protective and decorative plating copper system, the flexible copper plating layer with low porosity plays an important role in improving the bonding force and corrosion resistance between the plating layers, the silver-aluminum paste coating 6 at the outer side end of the electroplated copper layer 4 has excellent light reflection capability and metallic luster, is insoluble in water-based paint, is directly bonded and fixed through the silver glue coating layer 5 and is durable, the nylon fiber layer 7 and the polyester fiber layer 8 are both formed by fiber spinning, higher shielding performance is improved, the structural strength is high, and the anti-oxidation and corrosion resistance is realized, and the aluminum foil layer 9 can play a long-time heat, high and low temperature resistance and high safety performance, the ultraviolet shielding agent is filled in the ultraviolet-proof layer 10, metal oxide with higher refractive index such as zinc oxide and titanium dioxide is adopted, the refractive index of the zinc oxide is 1.9, the refractive index of the titanium dioxide is as high as 2.6, and the ultraviolet-proof effect is good.

The utility model discloses an electromagnetic shielding cloth 1, substrate cloth layer 12, nickel plating layer 3, copper plating layer 4, silver-colored rubber coating layer 5, silver-aluminum thick liquid coating 6, nylon fiber layer 7, polyester fiber layer 8, aluminium foil layer 9, anti ultraviolet layer 10, the part is the component that general standard spare or technical personnel in the field know, its structure and principle all can be known or can be known through conventional experimental methods through the technical manual for this technical personnel, the problem that the utility model solves is that current electromagnetic shielding cloth porosity is low, protective properties is low, the range of application is limited, corrosion resistance is low, wearability is low, gloss and aesthetic property are low, short service life, it is not durable, the cladding material cohesion is weaker, the reflectance is relatively poor, inconvenient fixed mounting, the utility model discloses an above-mentioned parts make up each other, the porosity is high, mainly use as the decorative cladding material of protection, the range of application is wide, the coating has the advantages of corrosion prevention, wear resistance, luster and aesthetic property increase, improvement on the binding force of the coating, firmness, durability, long service life, excellent light reflection capability and metal luster, insolubility in water-based paint, convenience for direct bonding and fixation, and durability.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides an electromagnetic shielding cloth, includes the base cloth layer, the upper and lower surface coating on base cloth layer has first electromagnetic shielding layer and second electromagnetic shielding layer, its characterized in that: the surface coating of first electromagnetic shield layer has first electrically conductive copper cloth layer, the surface coating of second electromagnetic shield layer has the electrically conductive copper cloth layer of second, and the surface of first electrically conductive copper cloth layer is equipped with the conducting film, the surface of the electrically conductive copper cloth layer of second is equipped with self-adhesion conducting resin membrane.

2. An electromagnetic shielding cloth according to claim 1, characterized in that: the base cloth layer is made of aramid fiber and polyamide fiber blended cloth, the blended cloth is formed by crosswise weaving warps and wefts, and a plain weave structure or a twill weave structure is arranged between the warps and the wefts.

3. An electromagnetic shielding cloth according to claim 1, characterized in that: the first electromagnetic shielding layer and the second electromagnetic shielding layer are nickel plating layers or aluminum plating layers.

4. An electromagnetic shielding cloth according to claim 3, characterized in that: the nickel plating layer or the aluminum plating layer is in a vacuum nickel plating or vacuum aluminum plating mode, and the thickness range is 0.4-5 mu m.

5. An electromagnetic shielding cloth according to claim 1, characterized in that: the conductive film is an aluminum paste coating.

6. An electromagnetic shielding cloth according to claim 1, characterized in that: the self-adhesive conductive adhesive film is an acrylic pressure-sensitive adhesive glue layer.