CN108070889B - Pre-immersion liquid of electromagnetic shielding material - Google Patents
Pre-immersion liquid of electromagnetic shielding material Download PDFInfo
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- CN108070889B CN108070889B CN201711364712.1A CN201711364712A CN108070889B CN 108070889 B CN108070889 B CN 108070889B CN 201711364712 A CN201711364712 A CN 201711364712A CN 108070889 B CN108070889 B CN 108070889B
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/54—Electroplating of non-metallic surfaces
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
- C25D5/14—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
Abstract
The invention discloses a pre-immersion liquid for an electromagnetic shielding material, which comprises the following components in parts by weight: 15-20 parts of sulfuric acid, 15-20 parts of hydrochloric acid, 5-10 parts of sodium dodecyl sulfate, 10-15 parts of sodium dodecyl sulfate, 25-30 parts of nickel sulfamate, 3-5 parts of nickel chloride, 4-6 parts of boric acid and 15-20 parts of nickel sulfate, wherein the pH value of the pre-leaching solution is 4.3-4.6, and the temperature is 45-55 ℃. When the electromagnetic shielding material is prepared, the base material is soaked in the pre-immersion liquid before electroplating, so that the hydrophilicity of the base material can be improved, the plating leakage caused by the enrichment of bubbles on the surface of the base material is improved, the qualification rate and the shielding effect of a final product are improved, and the pre-immersion liquid has the advantages of easily available raw materials and low price.
Description
Technical Field
The invention belongs to the field of electromagnetic shielding materials, and particularly relates to a pre-immersion liquid of an electromagnetic shielding material.
Background
Along with the development of social economy and the improvement of the living standard of people, high-tech electric products are more and more popular with people, mobile phones, computers, televisions and microwave ovens bring convenience to the life of people, meanwhile, certain confusion to people is brought, and the problem of electromagnetic radiation is more and more prominent. In order to reduce and avoid the damage of electromagnetic radiation to human body, the demand of electromagnetic shielding materials is increasing, and materials with three-dimensional porous conductive structures represented by conductive sponges and shielding materials with two-dimensional structures represented by conductive cloth appear. The performance requirements for electromagnetic shielding products are also increasing, and besides the functions of resisting electromagnetic interference and radiation and resisting static electricity, it is also desirable to have the functions of resisting ultraviolet radiation, resisting bacteria and deodorizing or other additional functions. Compared with electromagnetic shielding materials such as films and plates, the electromagnetic shielding conductive cloth and the conductive sponge have wider and wider use due to unique flexibility and convenient processing characteristics, and can be processed into conductive cloth adhesive tapes, punched conductive cloth and conductive foam for electronic products and devices, and can also be made into clothes, packaging bags, decorative materials and the like for meeting the requirements of people on preventing electromagnetic radiation in daily life.
The method for preparing the electromagnetic shielding material mainly comprises chemical plating, electroplating, sputtering plating and the like. Wherein, the chemical copper and nickel plating process has high production cost, and the waste water generated in the production process is difficult to treat, which causes serious environmental pollution; although the production cost is reduced by electroplating copper and plating nickel, the operation control is difficult and the product quality is difficult to ensure because the base material is unstable; the equipment used for sputtering plating is high in price, difficult to produce in large scale and incapable of meeting the market requirement. At present, the base materials are prepared by adopting more preparation methods, namely direct copper electroplating and nickel electroplating processes without pre-dipping, the hydrophilicity of the base materials of the electromagnetic shielding material obtained by the electroplating method is poor, and bubbles are easily enriched on the surface of the base materials in the electroplating process to cause plating leakage, so that the quality of products is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a pre-immersion liquid for an electromagnetic shielding material.
The invention provides a pre-immersion liquid of an electromagnetic shielding material, which comprises the following components in parts by weight: 15-20 parts of sulfuric acid, 15-20 parts of hydrochloric acid, 5-10 parts of sodium dodecyl sulfate, 10-15 parts of sodium dodecyl sulfate, 25-30 parts of nickel sulfamate, 3-5 parts of nickel chloride, 4-6 parts of boric acid and 15-20 parts of nickel sulfate, wherein the pH value of the pre-leaching solution is 4.3-4.6, and the temperature is 45-55 ℃.
Preferably, the mass fraction of the sulfuric acid solution is 5-10%.
Preferably, the mass fraction of the hydrochloric acid solution is 5-10%.
Preferably, the mass fraction of the sodium dodecyl sulfate solution is 2-5%.
Preferably, the mass fraction of the sodium dodecyl sulfate solution is 2-5%.
Preferably, the content of the nickel sulfamate is 250-300 g/L.
Preferably, the content of the nickel sulfamate is 260 g/L.
Preferably, the content of the nickel chloride is 30-50 g/L.
Preferably, the content of the nickel chloride is 40 g/L.
Preferably, the boric acid content is 40-60 g/L.
Preferably, the boric acid content is 45 g/L.
Preferably, the content of the nickel sulfate is 150-200 g/L.
Preferably, the content of the nickel sulfate is 180 g/L.
The invention has the beneficial effects that: when the electromagnetic shielding material is prepared, the base material is soaked in the pre-immersion liquid before electroplating, so that the hydrophilicity of the base material can be improved, the plating leakage caused by the enriched bubbles on the surface of the base material is improved, the qualification rate of a final product and the shielding effect are improved, and the pre-immersion liquid has the advantages of easily available raw materials, low price and easy realization of industrial production.
Detailed Description
Example 1
1) Pre-impregnation
Placing the conductive cloth subjected to the conductive treatment into a pre-soaking tank for soaking, wherein the pre-soaking solution comprises 15g of 5% sulfuric acid solution, 15g of 5% hydrochloric acid solution, 5g of 2% sodium dodecyl sulfate, 12g of 2% sodium dodecyl sulfate, 25g of nickel sulfamate, 3g of nickel chloride, 5g of boric acid and 20g of nickel sulfate, the pH value of the pre-soaking solution is 4.3, the temperature is 45 ℃, and the pre-soaking time is 5 min.
2) Preplating
Pre-plating the conductive cloth treated in the step 1), wherein the pre-plating solution comprises 240g/L nickel sulfamate, 35g/L nickel chloride and 35g/L boric acid. The pH value is 4.4, the temperature is 40 ℃, and the current density is 2.8A/dm2The preplating time is 3 min.
3) Main plating
Performing main plating on the conductive cloth treated in the step 2), wherein the main plating solution has the same components as the pre-plating solution, the pH value is 4.4, the temperature is 40 ℃, and the current density is 3.4A/dm2The main plating time is 7 min.
4) Washing the conductive cloth treated in the step 3), and drying at 250 ℃ to obtain the electromagnetic shielding product.
Example 2
1) Pre-impregnation
Placing the conductive cloth subjected to the conductive treatment into a pre-soaking tank for soaking, wherein the pre-soaking solution comprises 16.5g of 8% sulfuric acid solution, 16g of 8% hydrochloric acid solution, 5g of 3% sodium dodecyl sulfate, 10g of 3% sodium dodecyl sulfate, 26g of nickel sulfamate, 4g of nickel chloride, 4.5g of boric acid and 18g of nickel sulfate, the pH value of the pre-soaking solution is 4.4, the temperature is 50 ℃, and the pre-soaking time is 4 min.
2) Preplating
Pre-plating the conductive sponge treated in the step 1), wherein the pre-plating solution comprises 260g/L of nickel sulfamate, 40g/L of nickel chloride and 35g/L of boric acid. The pH value is 4.6, the temperature is 45 ℃, and the current density is 3.0A/dm2The preplating time is 3 min.
3) Main plating
Performing main plating on the conductive sponge treated in the step 2), wherein the main plating solution has the same components as the pre-plating solution, the pH value is 4.6, the temperature is 45 ℃, and the current density is 3.7A/dm2The main plating time is 6 min.
4) Washing the conductive sponge treated in the step 3), and drying at 250 ℃ to obtain the electromagnetic shielding product.
Example 3
1) Pre-impregnation
Placing the conductive cloth subjected to the conductive treatment into a pre-soaking tank for soaking, wherein the pre-soaking solution comprises 20g of 10% sulfuric acid solution, 15g of 10% hydrochloric acid solution, 6g of 5% sodium dodecyl sulfate, 10g of 5% sodium dodecyl sulfate, 25g of nickel sulfamate, 5g of nickel chloride, 4g of boric acid and 15g of nickel sulfate, the pH value of the pre-soaking solution is 4.6, the temperature is 55 ℃, and the pre-soaking time is 5 min.
2) Preplating
Pre-plating the conductive cloth treated in the step 1), wherein the pre-plating solution comprises 270g/L nickel sulfamate, 45g/L nickel chloride and 35g/L boric acid. The pH value is 4.8, the temperature is 50 ℃, and the current density is 3A/dm2The preplating time is 4 min.
3) Main plating
Performing main plating on the conductive cloth treated in the step 2), wherein the main plating solution has the same components as the pre-plating solution, the pH value is 4.8, the temperature is 50 ℃, and the current density is 3.75A/dm2The main plating time is 7 min.
4) Washing the conductive cloth treated in the step 3), and drying at 250 ℃ to obtain the electromagnetic shielding product.
Example 4
1) Pre-impregnation
Placing the conductive cloth subjected to the conductive treatment into a pre-soaking tank for soaking, wherein the pre-soaking solution comprises 15g of 6% sulfuric acid solution, 20g of 10% hydrochloric acid solution, 8g of 2% sodium dodecyl sulfate, 10g of 4% sodium dodecyl sulfate, 25g of nickel sulfamate, 3g of nickel chloride, 4g of boric acid and 15g of nickel sulfate, the pH value of the pre-soaking solution is 4.3, the temperature is 45 ℃, and the pre-soaking time is 4 min.
2) Preplating
Pre-plating the conductive cloth treated in the step 1), wherein the pre-plating solution is 300g/L of nickel sulfate and 60g/L of nickel chloride. The pH value is 4.3, the temperature is 45 ℃, and the current density is 2.8A/dm2The preplating time is 4 min.
3) Main plating
Performing main plating on the conductive cloth treated in the step 2), wherein the main plating solution has the same components as the pre-plating solution, the pH value is 4.3, the temperature is 45 ℃, and the current density is 3.4A/dm2The main plating time is 7 min.
4) Washing the conductive cloth treated in the step 3), and drying at 250 ℃ to obtain the electromagnetic shielding product.
Example 5
1) Pre-impregnation
Placing the conductive cloth subjected to the conductive treatment into a pre-soaking tank for soaking, wherein the pre-soaking solution comprises 15g of 8% sulfuric acid solution, 15g of 6% hydrochloric acid solution, 5g of 5% sodium dodecyl sulfate, 15g of 2% sodium dodecyl sulfate, 25g of nickel sulfamate, 4g of nickel chloride, 6g of boric acid and 15g of nickel sulfate, the pH value of the pre-soaking solution is 4.5, the temperature is 50 ℃, and the pre-soaking time is 5 min.
2) Preplating
Pre-plating the conductive cloth treated in the step 1), wherein the pre-plating solution is 310g/L of nickel sulfate and 65g/L of nickel chloride. The pH value is 4.4, the temperature is 50 ℃, and the current density is 3.0A/dm2The preplating time is 4 min.
3) Main plating
Performing main plating on the conductive cloth treated in the step 2), wherein the main plating solution has the same components as the pre-plating solution, the pH value is 4.4, the temperature is 50 ℃, and the current density is 3.7A/dm2The main plating time is 7 min.
4) Washing the conductive cloth treated in the step 3), and drying at 250 ℃ to obtain the electromagnetic shielding product.
Example 6
1) Pre-impregnation
Placing the conductive cloth subjected to the conductive treatment into a pre-soaking tank for soaking, wherein the pre-soaking solution comprises 15g of 8% sulfuric acid solution, 15g of 10% hydrochloric acid solution, 10g of 3% sodium dodecyl sulfate, 10g of 5% sodium dodecyl sulfate, 25g of nickel sulfamate, 3g of nickel chloride, 5g of boric acid and 17g of nickel sulfate, the pH value of the pre-soaking solution is 4.4, the temperature is 45 ℃, and the pre-soaking time is 5 min.
2) Preplating
Pre-plating the conductive sponge treated in the step 1), wherein the pre-plating solution is 330g/L of nickel sulfate and 70g/L of nickel chloride. The pH value is 4.6, the temperature is 55 ℃, and the current density is 3A/dm2The preplating time is 4 min.
3) Main plating
Performing main plating on the conductive sponge treated in the step 2), wherein the main plating solution has the same components as the pre-plating solution, the pH value is 4.6, the temperature is 55 ℃, and the current density is 3.75A/dm2The main plating time is 7 min.
4) Washing the conductive sponge treated in the step 3), and drying at 250 ℃ to obtain the electromagnetic shielding product.
Comparative example 1
1) Pre-impregnation
And putting the conductive cloth subjected to the conductive treatment into a pre-immersion tank for immersion, wherein the pre-immersion liquid is 330g/L of nickel sulfate and 70g/L of nickel chloride. The pH value is 4.6, the temperature is 45 ℃, and the presoaking time is 5 min.
2) Preplating
Pre-plating the conductive sponge treated in the step 1), wherein the pre-plating solution is 330g/L of nickel sulfate and 70g/L of nickel chloride. The pH value is 4.6, the temperature is 55 ℃, and the current density is 3A/dm2The preplating time is 4 min.
3) Main plating
Performing main plating on the conductive sponge treated in the step 2), wherein the main plating solution has the same components as the pre-plating solution, the pH value is 4.6, the temperature is 55 ℃, and the current density is 3.75A/dm2The main plating time is 6 min.
4) Washing the conductive sponge treated in the step 3), and drying at 250 ℃ to obtain the electromagnetic shielding product.
Comparative example 2
1) Pre-impregnation
Placing the conductive cloth subjected to the conductive treatment into a pre-immersion tank for immersion, wherein the pre-immersion liquid comprises 270g/L nickel sulfamate, 45g/L nickel chloride and 35g/L boric acid. The pH value is 4.8, the temperature is 50 ℃, and the presoaking time is 4 min.
2) Preplating
Pre-plating the conductive cloth treated in the step 1), wherein the pre-plating solution comprises 270g/L nickel sulfamate, 45g/L nickel chloride and 35g/L boric acid. The pH value is 4.8, the temperature is 50 ℃, and the current density is 3A/dm2The preplating time is 3 min.
3) Main plating
Performing main plating on the conductive cloth treated in the step 2), wherein the main plating solution has the same components as the pre-plating solution, the pH value is 4.8, the temperature is 50 ℃, and the current density is 3.75A/dm2The main plating time is 7 min.
4) Washing the conductive cloth treated in the step 3), and drying at 250 ℃ to obtain the electromagnetic shielding product.
The product quality of the electromagnetic shielding products obtained in examples 1 to 6 and comparative examples 1 to 2 is compared with that of Table 1.
TABLE 1 quality of electromagnetic shielding product (qualified standard resistance ≤ 5m Ω/sq)
| Examples | Resistance (m omega/sq) | Product percent of pass |
| Example 1 | 2.8 | 91％ |
| Example 2 | 2.2 | 92％ |
| Example 3 | 2.5 | 96％ |
| Example 4 | 2.7 | 95％ |
| Example 5 | 2.6 | 93％ |
| Example 6 | 2.7 | 94％ |
| Comparative example 1 | 3.5 | 87％ |
| Comparative example 2 | 3.6 | 87％ |
As can be seen from the data in the table, when the leaching solution is used for pre-dipping the base material before electroplating, the resistance of the final product is greatly reduced, the qualification rate of the product is greatly improved, and when the content of nickel sulfamate is 260 g/L. When the content of the nickel chloride is 40g/L, the content of the boric acid is 45g/L and the content of the nickel sulfate is 180g/L, the obtained electromagnetic shielding product has the minimum resistance and the best conductivity.
Claims (9)
1. The pre-immersion liquid for the electromagnetic shielding material is characterized in that the electromagnetic shielding material is conductive cloth or conductive sponge subjected to conductive treatment, and comprises the following components in parts by weight: 15-20 parts of sulfuric acid, 15-20 parts of hydrochloric acid, 5-10 parts of sodium dodecyl sulfate, 10-15 parts of sodium dodecyl sulfate, 25-30 parts of nickel sulfamate, 3-5 parts of nickel chloride, 4-6 parts of boric acid and 15-20 parts of nickel sulfate, wherein the pH value of the pre-leaching solution is 4.3-4.6, and the temperature is 45-55 ℃.
2. The pre-dip of electromagnetic shielding material according to claim 1, wherein the sulfuric acid is present in an amount of 5 to 10% by mass.
3. The pre-dip of electromagnetic shielding material according to claim 1, wherein the hydrochloric acid is present in an amount of 5 to 10% by mass.
4. A pre-dip of electromagnetic shielding material according to any of claims 1 to 3, wherein the mass fraction of the sodium dodecylsulfate is 2 to 5%.
5. A pre-dip of electromagnetic shielding material according to any of claims 1 to 3, wherein the mass fraction of the sodium lauryl sulfate is 2 to 5%.
6. The pre-dip of electromagnetic shielding material as set forth in any of claims 1-3, wherein the content of nickel sulfamate is 250-300 g/L.
7. A pre-dip for electromagnetic shielding material according to any of claims 1 to 3, wherein the nickel chloride is contained in an amount of 30 to 50 g/L.
8. The pre-dip of electromagnetic shielding material according to any of claims 1 to 3, wherein the boric acid content is 40 to 60 g/L.
9. The pre-dip of electromagnetic shielding material as set forth in any of claims 1-3, wherein the nickel sulfate content is 150-200 g/L.
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| CN201711364712.1A CN108070889B (en) | 2017-12-18 | 2017-12-18 | Pre-immersion liquid of electromagnetic shielding material |
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| CN201711364712.1A CN108070889B (en) | 2017-12-18 | 2017-12-18 | Pre-immersion liquid of electromagnetic shielding material |
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| CN108070889B true CN108070889B (en) | 2020-07-03 |
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| CN115413214B (en) * | 2022-08-02 | 2023-10-03 | 国网浙江省电力有限公司综合服务分公司 | High-voltage test hall electric field shielding curtain and preparation process and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102206843A (en) * | 2011-05-19 | 2011-10-05 | 宁波中骏上原汽车零部件有限公司 | Automotive LOGO surface treatment method |
| CN104499032A (en) * | 2014-12-30 | 2015-04-08 | 广西师范大学 | Plating solution for electroplating Ni/graphene compound heat conduction film on surface of substrate |
| CN105951142A (en) * | 2016-05-19 | 2016-09-21 | 南通柏源汽车零部件有限公司 | Pretreatment technology for electroplating of automobile door handle |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102206843A (en) * | 2011-05-19 | 2011-10-05 | 宁波中骏上原汽车零部件有限公司 | Automotive LOGO surface treatment method |
| CN104499032A (en) * | 2014-12-30 | 2015-04-08 | 广西师范大学 | Plating solution for electroplating Ni/graphene compound heat conduction film on surface of substrate |
| CN105951142A (en) * | 2016-05-19 | 2016-09-21 | 南通柏源汽车零部件有限公司 | Pretreatment technology for electroplating of automobile door handle |
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