CN109735832B - Preparation method of shielding wire mesh, prepared shielding wire mesh and shielding glass - Google Patents
Preparation method of shielding wire mesh, prepared shielding wire mesh and shielding glass Download PDFInfo
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- CN109735832B CN109735832B CN201910141278.3A CN201910141278A CN109735832B CN 109735832 B CN109735832 B CN 109735832B CN 201910141278 A CN201910141278 A CN 201910141278A CN 109735832 B CN109735832 B CN 109735832B
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Abstract
The invention discloses a preparation method of a shielding wire mesh, the prepared shielding wire mesh and shielding glass, and belongs to the technical field of special glass manufacturing. The method for preparing the shielding glass disclosed by the invention adopts two metal plating solutions with proper formula and pH value to coat and plate the metal wire mesh to obtain the nickel-copper double-plating-layer shielding wire mesh with excellent shielding efficiency, the shielding wire mesh has a strong absorption and reflection function on electromagnetic waves, and the shielding glass prepared by using the shielding wire mesh with the mesh opening of 100 meshes has the shielding efficiency of not less than 50dB in the frequency range of 30MHz-1GHz, so that the shielding glass has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of special glass manufacturing, particularly relates to a screen coating method, and particularly relates to a method for preparing a shielding screen with shielding function in the middle of shielding glass, the shielding screen prepared by the method and the shielding glass prepared by the screen.
Background
The traditional shielding glass comprises film-coated shielding glass and screen sandwich type shielding glass, wherein the screen sandwich type shielding glass is a composite glass product with a shielding function, which is formed by mutually and firmly bonding two or more than two glass plates by an interlayer consisting of an intermediate film and a screen. The plating layer of the middle shielding silk screen with the electromagnetic shielding effect at present comprises a nickel plating layer, a nickel-phosphorus alloy plating layer and the like.
In the chemical plating technology, CN109112509A discloses a high corrosion resistance chemical nickel plating solution and a preparation method thereof, wherein the high corrosion resistance chemical nickel plating solution comprises a basic chemical nickel solution, a wetting agent, a brightening agent and a stabilizing agent, and the basic chemical nickel solution comprises nickel sulfate, sodium hypophosphite, citric acid, lactic acid, propionic acid and sodium acetate. The highly corrosion-resistant electroless nickel plating solution disclosed in the patent document uses sodium hypophosphite as a reducing agent, and phosphorus is precipitated during reduction, so that co-deposition of phosphorus and nickel occurs, and therefore, the electroless nickel plating layer obtained by using the electroless nickel plating solution disclosed in the patent document is a nickel-phosphorus alloy plating layer in which phosphorus is dispersed, and has a high corrosion resistance performance, but how much the electromagnetic shielding performance is provided.
Disclosure of Invention
To solve one or more problems of the prior art, an aspect of the present invention provides a method for preparing a shielding wire mesh, including the steps of:
treating a wire mesh with a first metal plating solution, wherein the first metal plating solution comprises: nickel sulfate, a reducing agent, a complexing agent and a stabilizing agent;
treating the silk screen treated by the first metal plating solution by using a second metal plating solution to obtain a shielding silk screen, wherein the second metal plating solution comprises: copper sulfate, complexing agent and reducing agent.
The wire mesh is a metal wire mesh, preferably a stainless steel wire mesh.
The first metal plating solution includes: 23-25g/L nickel sulfate, 10-50g/L reducing agent, 20-40g/L complexing agent and 10-35g/L stabilizer, wherein the pH range is 8-10; preferably, the first metal plating solution comprises a reducing agent with the concentration of 25g/L, the content of nickel precipitated at the time is highest, the pH value is 8.5, the content of nickel in the plating layer is highest, and the pH regulator is ammonia water; the following chemical reactions take place in the first metal plating bath:
N2H4+4Ni+＝4Ni↓+N2↑+4H+
the second metal plating solution includes: copper sulfate with the concentration of 25-27g/L, reducing agent with the concentration of 10-50g/L and complexing agent with the concentration of 10-30g/L, wherein the pH range is 10-13; preferably, the second metal plating solution comprises a reducing agent with the concentration of 25g/L, the content of the precipitated copper is the highest, the pH value is 11.5, the content of the copper in the plating layer is the highest, and the pH regulator is NaOH; the following chemical reactions take place in the second metal plating bath:
NaOH+CuSO4＝Na2SO4+Cu(OH)2
HCHO+Cu(OH)2＝Cu2O+HCOOH+H2O
Cu2O+2HCHO+2OH-＝2Cu↓+2HCOO-+H2↑+H2O
the reducing agent in the first metal plating solution is selected from any one of hydrazine, hypophosphite, sodium borohydride and borane or a mixture of hydrazine and the hypophosphite, preferably hydrazine; the complexing agent is selected from any one or mixture of sodium citrate, ammonium citrate and lactic acid, preferably sodium citrate; the stabilizer is selected from one or mixture of ammonium chloride, ammonium sulfate and sodium acetate, preferably ammonium chloride.
The reducing agent in the second metal plating solution is selected from any one of formaldehyde, sodium hypophosphite, sodium borohydride, dimethylamino borane (DMAB) and hydrazine or a mixture thereof, and preferably formaldehyde; the complexing agent is selected from one or more of disodium ethylene diamine tetraacetate, sodium citrate, sodium gluconate, triethanolamine, glycerol and glycolic acid, preferably disodium ethylene diamine tetraacetate.
The method specifically comprises the following steps:
immersing the silk screen into the first metal plating solution for 40-100 minutes, then taking out, naturally drying in the air, then carrying out heat treatment in a high-temperature furnace according to a certain temperature rise program, and cooling to obtain the silk screen treated by the first metal plating solution;
and immersing the silk screen treated by the first metal plating solution into the second metal plating solution for 30-50 minutes, taking out, naturally drying in air, then carrying out heat treatment in a high-temperature furnace according to the temperature-rising program, and cooling to obtain the shielding silk screen.
The temperature raising program includes: keeping the temperature for a period of time when the temperature rises by 10 ℃, wherein the temperature rise time is 2-3 hours, and the highest temperature does not exceed 90 ℃. Wherein the temperature is kept for a period of time when the temperature rises by 10 ℃, so as to ensure that the temperature of the wire mesh is uniform from inside to outside.
Another aspect of the present invention provides a metal plating solution including a first metal plating solution and a second metal plating solution, wherein the first metal plating solution includes: nickel sulfate, a reducing agent, a complexing agent and a stabilizing agent; the second metal plating solution includes: copper sulfate, complexing agent and reducing agent.
The first metal plating solution includes: 23-25g/L nickel sulfate, 10-50g/L reducing agent, 20-40g/L complexing agent and 10-35g/L stabilizer, wherein the pH range is 8-10; preferably, the first metal plating solution comprises a reducing agent with the concentration of 25g/L, the pH is 8.5, and the pH regulator is ammonia water.
The second metal plating solution includes: copper sulfate with the concentration of 25-27g/L, reducing agent with the concentration of 10-50g/L and complexing agent with the concentration of 10-30g/L, wherein the pH range is 10-13; preferably, the second metal plating solution comprises a reducing agent with the concentration of 25g/L, the pH is 11.5, and the pH regulator is NaOH.
The reducing agent in the first metal plating solution is selected from any one of hydrazine, hypophosphite, sodium borohydride and borane or a mixture of hydrazine and the hypophosphite, preferably hydrazine; the complexing agent is selected from any one or mixture of sodium citrate, ammonium citrate and lactic acid, preferably sodium citrate; the stabilizer is selected from one or mixture of ammonium chloride, ammonium sulfate and sodium acetate, preferably ammonium chloride.
The reducing agent in the second metal plating solution is selected from any one of formaldehyde, sodium hypophosphite, sodium borohydride, dimethylamino borane (DMAB) and hydrazine or a mixture thereof, and preferably formaldehyde; the complexing agent is selected from one or more of disodium ethylene diamine tetraacetate, sodium citrate, sodium gluconate, triethanolamine, glycerol and glycolic acid, preferably disodium ethylene diamine tetraacetate.
Another aspect of the present invention provides a shielding wire net, which is prepared according to the above method.
Still another aspect of the present invention provides a wire-mesh-sandwiched type shielding glass, which includes a first glass plate, a second glass plate, a first adhesive layer and a second adhesive layer disposed between the first glass plate and the second glass plate, and a shielding wire mesh disposed between the first adhesive layer and the second adhesive layer, the shielding wire mesh being the above-described shielding wire mesh.
The aperture size of the shielding silk screen is 80-200 meshes; the first glass plate and the second glass plate are selected from any one of tempered glass, organic glass, common glass and coated glass; the first bonding layer and the second bonding layer are selected from any one of PVB (polyvinyl butyral) glue and PU (polyurethane) film glue.
Based on the technical scheme, the invention provides a preparation method of a shielding wire mesh with shielding effect in the middle of shielding glass, which comprises the steps of sequentially adopting two metal plating solutions with certain pH value and main salt concentration, and coating and plating the wire mesh based on the principle of chemical plating to obtain the shielding wire mesh with uniform plating layer thickness, good corrosion resistance and excellent shielding effect. The shielding glass prepared from the shielding wire mesh shows excellent shielding effectiveness. Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the two metal plating solutions are adopted to coat the metal wire mesh in sequence, so that the nickel-copper double-plating metal shielding wire mesh is finally obtained, the hardness of the metal wire mesh coated by the method can reach 400-700HV before heat treatment, and the hardness of the metal wire mesh coated by the method can be further improved to be close to or even exceed that of the chromium plating layer after the heat treatment process, so that the metal wire mesh has good wear resistance and corrosion resistance, and has very high stability in the atmosphere and other media. Most importantly, as nickel and copper have strong absorption and reflection functions on electromagnetic waves, the electromagnetic shielding effectiveness of the shielding wire mesh coated according to the method is greatly improved under the condition that the light transmittance is not less than 50%, the shielding wire mesh is calculated according to a measuring method SE (20 lg (E1/E2)) dB (E1 is the simulated electric field intensity under the condition of no shielding material, and E2 is the simulated electric field intensity with the shielding material), and the shielding glass prepared by using a 100-mesh wire mesh has the shielding effectiveness of not less than 50dB within the frequency range of 30MHz-1 GHz.
Drawings
FIG. 1 is a schematic diagram of the operation of a screen coating method according to the present invention;
the reference numbers in the figures denote:
1 is metal plating solution, 2 is silk screen, and 3 is frame.
Detailed Description
The electromagnetic shielding effectiveness, the light transmission performance and the wear resistance and corrosion resistance of the shielding wire mesh in the shielding glass are important indexes for measuring the quality of the shielding glass. Aiming at the defects of the shielding screen mesh in the prior art such as electromagnetic shielding effect, light transmittance and wear and corrosion resistance, the invention provides a method for coating a screen mesh based on the following technical principles to prepare the shielding screen mesh with better electromagnetic shielding effect on the premise of ensuring good light transmittance and wear and corrosion resistance: electroless plating, also known as autocatalytic plating, is a plating species for electroplating. The specific process is that under certain conditions, metal ions in the aqueous solution are reduced by a reducing agent and are precipitated on the surface of a solid substrate. It is characterized in that: the thickness of the plating layer is uniform, and the dispersion degree of the chemical plating solution is close to 100 percent. The chemical plating is an autocatalytic oxidation-reduction process, the plating can be carried out as long as the catalytic substrate is contacted with the solution, the shape of the substrate is almost copied, the copying degree is reached, the plating layer can be continuously thickened, and the plated metal also has catalytic capability. The different pH values and main salt concentrations of the used plating solutions can affect the electromagnetic shielding effect of the shielding wire mesh, so that the formula and the pH value of the plating solution are strictly controlled in the plating process, and therefore, the invention also provides the metal plating solution with the proper formula and pH value, and the shielding wire mesh prepared by using the metal plating solution and the shielding glass prepared by using the shielding wire mesh have better electromagnetic shielding effect.
The present invention will be described in further detail with reference to specific examples.
The following disclosure provides many different embodiments, or examples, for implementing different aspects of the invention. The present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.
The present invention is described in detail below with reference to specific examples. The embodiments are implemented on the premise of the technical scheme of the invention, and detailed implementation modes and specific operation processes are given, but the disclosure of the invention is not limited to the following embodiments.
The methods used in the following examples are conventional methods unless otherwise specified.
Example 1: preparation of shielding wire mesh
The wire mesh to be coated, which has uniform color and no wrinkles, is prepared, and can be a stainless steel wire mesh.
Coating and plating a first metal plating solution: wherein the formula of the first metal plating solution is specifically as follows: 23g/L of nickel sulfate, 50g/L of hydrazine, 20g/L of ammonium chloride, 35g/L of sodium citrate, ammonia water as a pH value regulator, and 8; as shown in figure 1, a frame (3) attached with a wire mesh to be plated is vertically hung on a hook of a steel wire rope under a cantilever beam, a winch handle is rotated to slowly immerse the wire mesh (2) into the first metal plating solution (1) below the frame, and after the wire mesh (2) is completely immersed for 40 minutes, the handle is shaken at a constant speed to lift the wire mesh (2) out of an aqueduct. Naturally drying in the air. After the liquid level on the silk screen (2) recedes, the wet film retained in the meshes is blown off by compressed air. Clamping the silk screen on a special clamp and hanging the silk screen into a high-temperature furnace. Care was taken not to wrinkle the web. And carrying out heat treatment according to a certain temperature rising program. The temperature rise program is to keep the temperature for a period of time when the temperature rises by 10 ℃, the temperature rise time is 2-3 hours, and the highest temperature is not more than 90 ℃. The power is cut off and the furnace is cooled.
Coating with a second metal plating solution: wherein the formula of the second metal plating solution is specifically as follows: 25g/L of copper sulfate, 50g/L of formaldehyde, 10g/L of ethylenediamine disodium acetate, NaOH as a pH regulator and 10 as a pH value. As shown in fig. 1, the frame (3) attached with the wire mesh coated by the first metal plating solution is vertically hung on a hook of a wire rope under a cantilever beam, a winch handle is rotated to slowly immerse the wire mesh (2) into the second metal plating solution (1) below the wire mesh, and after the wire mesh is completely immersed for 30 minutes, the handle is shaken at a constant speed to lift the wire mesh (2) out of a aqueduct. Naturally drying in the air. After the liquid level on the silk screen (2) recedes, the wet film retained in the meshes is blown off by compressed air. Clamping the silk screen on a special clamp and hanging the silk screen into a high-temperature furnace. Care was taken not to wrinkle the web. And carrying out heat treatment according to a certain temperature rising program. The temperature rise program is to keep the temperature for a period of time when the temperature rises by 10 ℃, the temperature rise time is 2-3 hours, and the highest temperature is not more than 90 ℃. The power is cut off and the furnace is cooled. And finally preparing the shielding silk screen.
Example 2: preparation of shielding wire mesh
The wire mesh to be coated, which has uniform color and no wrinkles, is prepared, and can be a stainless steel wire mesh.
Coating and plating a first metal plating solution: wherein the formula of the first metal plating solution is specifically as follows: 25g/L of nickel sulfate, 10g/L of hydrazine, 40g/L of ammonium chloride, 10g/L of sodium citrate, 10g/L of pH value regulator ammonia water and 10g/L of pH value; as shown in figure 1, a frame (3) attached with a wire mesh to be plated is vertically hung on a hook of a steel wire rope under a cantilever beam, a winch handle is rotated to slowly immerse the wire mesh (2) into the first metal plating solution (1) below the frame, and after the wire mesh (2) is completely immersed for 40 minutes, the handle is shaken at a constant speed to lift the wire mesh (2) out of an aqueduct. Naturally drying in the air. After the liquid level on the silk screen (2) recedes, the wet film retained in the meshes is blown off by compressed air. Clamping the silk screen on a special clamp and hanging the silk screen into a high-temperature furnace. Care was taken not to wrinkle the web. And carrying out heat treatment according to a certain temperature rising program. The temperature rise program is to keep the temperature for a period of time when the temperature rises by 10 ℃, the temperature rise time is 2-3 hours, and the highest temperature is not more than 90 ℃. The power is cut off and the furnace is cooled.
Coating with a second metal plating solution: wherein the formula of the second metal plating solution is specifically as follows: 27g/L of copper sulfate, 10g/L of formaldehyde, 30g/L of ethylene diamine acetic acid disodium, NaOH as a pH regulator and 13 as a pH value. As shown in fig. 1, the frame (3) attached with the wire mesh coated by the first metal plating solution is vertically hung on a hook of a wire rope under a cantilever beam, a winch handle is rotated to slowly immerse the wire mesh (2) into the second metal plating solution (1) below the wire mesh, and after the wire mesh is completely immersed for 30 minutes, the handle is shaken at a constant speed to lift the wire mesh (2) out of a aqueduct. Naturally drying in the air. After the liquid level on the silk screen (2) recedes, the wet film retained in the meshes is blown off by compressed air. Clamping the silk screen on a special clamp and hanging the silk screen into a high-temperature furnace. Care was taken not to wrinkle the web. And carrying out heat treatment according to a certain temperature rising program. The temperature rise program is to keep the temperature for a period of time when the temperature rises by 10 ℃, the temperature rise time is 2-3 hours, and the highest temperature is not more than 90 ℃. The power is cut off and the furnace is cooled. And finally preparing the shielding silk screen.
Example 3: preparation of shielding wire mesh
The wire mesh to be coated, which has uniform color and no wrinkles, is prepared, and can be a stainless steel wire mesh.
Coating and plating a first metal plating solution: wherein the formula of the first metal plating solution is specifically as follows: 24g/L of nickel sulfate, 25g/L of hydrazine, 30g/L of ammonium chloride, 25g/L of sodium citrate, ammonia water as a pH value regulator, and 8.5 as a pH value; as shown in figure 1, a frame (3) attached with a wire mesh to be plated is vertically hung on a hook of a steel wire rope under a cantilever beam, a winch handle is rotated to slowly immerse the wire mesh (2) into the first metal plating solution (1) below the frame, and after the wire mesh (2) is completely immersed for 40 minutes, the handle is shaken at a constant speed to lift the wire mesh (2) out of an aqueduct. Naturally drying in the air. After the liquid level on the silk screen (2) recedes, the wet film retained in the meshes is blown off by compressed air. Clamping the silk screen on a special clamp and hanging the silk screen into a high-temperature furnace. Care was taken not to wrinkle the web. And carrying out heat treatment according to a certain temperature rising program. The temperature rise program is to keep the temperature for a period of time when the temperature rises by 10 ℃, the temperature rise time is 2-3 hours, and the highest temperature is not more than 90 ℃. The power is cut off and the furnace is cooled.
Coating with a second metal plating solution: wherein the formula of the second metal plating solution is specifically as follows: 26g/L of copper sulfate, 25g/L of formaldehyde, 20g/L of ethylene diamine acetic acid disodium, NaOH as a pH regulator and 11.5 of pH value. As shown in fig. 1, the frame (3) attached with the wire mesh coated by the first metal plating solution is vertically hung on a hook of a wire rope under a cantilever beam, a winch handle is rotated to slowly immerse the wire mesh (2) into the second metal plating solution (1) below the wire mesh, and after the wire mesh is completely immersed for 30 minutes, the handle is shaken at a constant speed to lift the wire mesh (2) out of a aqueduct. Naturally drying in the air. After the liquid level on the silk screen (2) recedes, the wet film retained in the meshes is blown off by compressed air. Clamping the silk screen on a special clamp and hanging the silk screen into a high-temperature furnace. Care was taken not to wrinkle the web. And carrying out heat treatment according to a certain temperature rising program. The temperature rise program is to keep the temperature for a period of time when the temperature rises by 10 ℃, the temperature rise time is 2-3 hours, and the highest temperature is not more than 90 ℃. The power is cut off and the furnace is cooled. And finally preparing the shielding silk screen.
Example 4: preparation of shielding glass
In this embodiment, the method for producing the shielding glass includes: a glass plate is laid on a table top, a film with the same size as the glass plate is placed on the glass plate, the shielding silk screen prepared in the embodiment 1-3 is placed on the film, then a film is laid on the shielding silk screen, another glass plate is placed on the film, the whole is placed in a vacuum bag and placed in a pressurizing kettle for vacuum pumping and hot pressing, and the shielding glass is prepared. Wherein the glass plate can be selected from any one of toughened glass, organic glass, common glass and coated glass; the film can be selected from any one of PVB film and PU film; the aperture size of the shielding silk screen can be 80-200 meshes.
Testing the performance of the shielding glass:
shielding effectiveness: according to the detection method of GJB6190-2008, calculating the shielding effectiveness of the shielding glass prepared by the invention by adopting SE ═ 20lg (E1/E2) dB (E1 is the simulated electric field strength under the condition of no shielding material, and E2 is the simulated electric field strength with the shielding material), and the result shows that under the condition of 100 meshes of the shielding screen aperture, the shielding effectiveness of the shielding glass is shown in Table 1 in the frequency range of 30MHz-1GHz, and the shielding effectiveness is more than 50 dB. The shielding effectiveness of the screen sandwich type shielding glass existing in the market is only about 40dB under the condition of the shielding screen (nickel plating layer) with the same aperture and the electric field intensity. The shielding glass prepared by the metal wire mesh coated by the method is greatly improved in shielding efficiency.
Table 1: shielding effectiveness detection result of shielding glass
Zhuming et al have studied the shielding effectiveness of wire mesh shielding glass (Zhuming, Jiangxing, "testing and research of shielding effectiveness of wire mesh shielding glass", electronic quality, No. 11 of 2007), wherein disclosed is a wire mesh shielding glass whose shielding effectiveness is mostly more than 50dB in the frequency range of 30MHz-4GHz, but do not mention the mesh size of the wire mesh used in the research and the plating structure of the wire mesh, so that the specific shielding effectiveness and light transmittance of the wire mesh shielding glass cannot be determined. Since the mesh size of the wire mesh has a decisive role in the shielding effectiveness and the light transmittance of the shielding glass, it is difficult to compare the numerical values of the shielding effectiveness under the condition that the mesh sizes of the wire mesh are not equal.
In the preparation process of the shielding wire mesh, the hardness of the metal coating is detected according to GB9790-88, and the result shows that the hardness of the metal wire mesh coated by the method can reach 400-700HV before heat treatment, and the hardness can be further improved to be close to or even exceed the hardness of the chromium coating after the heat treatment process, so that the coating has good wear resistance and corrosion resistance, and has very high stability in the atmosphere and other media.
The radiation resistance and heat resistance of the shielding glass prepared by the invention are detected according to GB15763.3-2009, and the shielding glass can meet the quality inspection requirements.
The moisture resistance of the shielding glass prepared by the invention is detected according to GB/T5137.3-2002, and the quality inspection requirement is met.
The color identification and the visible light transmittance of the shielding glass prepared by the invention are detected according to GB/T5137.2-2002, the quality inspection requirements can be met, and the transmittance of the shielding glass with the aperture size of the shielding silk screen of 80-200 meshes is more than 50 percent.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A preparation method of a shielding wire mesh for shielding glass is characterized by comprising the following steps:
treating the silk screen by using a first metal plating solution, specifically, immersing the silk screen in the first metal plating solution for 40-100 minutes, taking out, naturally drying in the air, then carrying out heat treatment in a high-temperature furnace according to a certain temperature rise program, and cooling to obtain the silk screen treated by the first metal plating solution; wherein the first metal plating solution comprises: nickel sulfate, a reducing agent, a complexing agent and a stabilizing agent;
treating the silk screen treated by the first metal plating solution by using a second metal plating solution to obtain a shielding silk screen, and specifically, immersing the silk screen treated by the first metal plating solution into the second metal plating solution for 30-50 minutes, taking out, naturally drying in the air, then carrying out heat treatment in a high-temperature furnace according to the temperature-rising program, and cooling to obtain the shielding silk screen; wherein the second metal plating solution comprises: copper sulfate, complexing agent and reducing agent;
the temperature raising program comprises: keeping the temperature for a period of time when the temperature rises by 10 ℃, wherein the temperature rise time is 2-3 hours, and the highest temperature does not exceed 90 ℃;
the first metal plating solution includes: 23-25g/L nickel sulfate, 10-50g/L reducing agent, 20-40g/L complexing agent and 10-35g/L stabilizer, wherein the pH range is 8-10; the reducing agent in the first metal plating solution is hydrazine;
the second metal plating solution includes: copper sulfate with the concentration of 25-27g/L, reducing agent with the concentration of 10-50g/L and complexing agent with the concentration of 10-30g/L, wherein the pH range is 10-13;
the wire mesh is a metal wire mesh, and the aperture of the shielding wire mesh is 80-200 meshes.
2. The method of claim 1, wherein the wire mesh is a stainless steel wire mesh; and/or
The first metal plating solution comprises a reducing agent with the concentration of 25g/L, the pH value is 8.5, and a pH regulator is ammonia water; and/or
The second metal plating solution comprises a reducing agent with the concentration of 25g/L, the pH value is 11.5, and a pH regulator is NaOH.
3. The method according to claim 1 or 2, wherein the complexing agent in the first metal plating solution is selected from any one of sodium citrate, ammonium citrate, lactic acid or a mixture thereof; the stabilizer is selected from one of ammonium chloride, ammonium sulfate and sodium acetate or mixture thereof; and/or
The reducing agent in the second metal plating solution is selected from any one of formaldehyde, sodium hypophosphite, sodium borohydride, dimethylamino borane and hydrazine or a mixture of the formaldehyde, the sodium hypophosphite, the sodium borohydride and the dimethylamino borane; the complexing agent is selected from one or more of disodium ethylene diamine tetraacetate, sodium citrate, sodium gluconate, triethanolamine, glycerol and glycolic acid.
4. A shielding wire mesh prepared according to the method of any one of claims 1-3, having a pore size of 80-200 mesh.
5. A wire mesh sandwich type shielding glass, comprising a first glass plate, a second glass plate, a first bonding layer and a second bonding layer arranged between the first glass plate and the second glass plate, and a shielding wire mesh arranged between the first bonding layer and the second bonding layer, wherein the shielding wire mesh is the shielding wire mesh of claim 4, the aperture size of the shielding wire mesh is 80-200 meshes, and the transmittance of the shielding glass is more than 50%.
6. The shielding glass according to claim 5, wherein the aperture size of the shielding wire mesh is 100 mesh, and the shielding effectiveness is greater than 50dB in the frequency range of 30MHz to 1 GHz; the first glass plate and the second glass plate are selected from any one of tempered glass, organic glass, common glass and coated glass; the first bonding layer and the second bonding layer are selected from any one of PVB (polyvinyl butyral) glue and PU (polyurethane) film glue.
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| CN201408553Y (en) * | 2009-05-25 | 2010-02-17 | 杨黔刚 | Electromagnetic shielding glass |
| CN101705615A (en) * | 2009-11-03 | 2010-05-12 | 上海大学 | Preparation method of nickel-plated and copper-plated aromatic polyamide conductive fibers |
| CN102632687A (en) * | 2012-03-27 | 2012-08-15 | 沈阳理工大学 | Method for manufacturing integral wire mesh |
| CN104582457A (en) * | 2013-10-18 | 2015-04-29 | 常州市中泰屏蔽设备有限公司 | Electromagnetic shielding glass |
| CN104928914A (en) * | 2015-06-26 | 2015-09-23 | 上海大学 | Method for preparing aramid composite conductive fibers with nickel/copper coatings |
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