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Preparation method of nickel-coated graphite composite particles and application of nickel-coated graphite composite particles in field of electromagnetic shielding

A composite particle, nickel-coated graphite technology, applied in the fields of magnetic field/electric field shielding, electrical components, liquid chemical plating, etc., can solve the problems of poor plating solution stability, high conductive path, poor electromagnetic performance, etc., and achieve good oxidation resistance. , low internal stress, and the effect of reducing production costs

Pending Publication Date: 2022-07-05
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The method adopts double complexing agent nickel plating solution in the electroless nickel plating process, and by adjusting the content ratio of the two complexing agents potassium sodium tartrate and sodium citrate, the purpose of stabilizing the reaction rate of electroless nickel plating is achieved; After the reaction, a nickel coating with high conductive path, high adhesion and low internal stress can be obtained, which avoids problems such as loose coating and poor stability of the plating solution caused by uncontrollable reaction rate in the electroless nickel plating process
At the same time, hydrazine hydrate is used as the reducing agent to obtain pure nickel coating, which avoids the problems of poor electromagnetic properties caused by the formation of amorphous coatings containing impurity elements such as phosphorus and boron in the prior art.

Method used

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  • Preparation method of nickel-coated graphite composite particles and application of nickel-coated graphite composite particles in field of electromagnetic shielding
  • Preparation method of nickel-coated graphite composite particles and application of nickel-coated graphite composite particles in field of electromagnetic shielding
  • Preparation method of nickel-coated graphite composite particles and application of nickel-coated graphite composite particles in field of electromagnetic shielding

Examples

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Embodiment 1

[0032] A preparation method of nickel-coated graphite composite particles, the specific implementation steps are as follows:

[0033] Step 1: Place 1 g of flake graphite matrix with a particle size of 100 μm in 500 ml of sodium hydroxide solution with a concentration of 80 g / L for heating and stirring, the heating temperature is 50 °C, and the stirring time is 30 min. After finishing the degreasing and cleaning pretreatment, it was then placed in a vacuum drying box at 40°C and dried for 12 hours before use;

[0034] Step 2: Prepare an electroless nickel plating solution, and use a sodium hydroxide solution to adjust the pH of the plating solution to 12. In the plating solution, the nickel sulfate concentration is 16g / L, the potassium sodium tartrate concentration is 9.4g / L, the sodium citrate concentration is 23.5g / L, and the hydrazine hydrate concentration is 10g / L. In this embodiment, potassium sodium tartrate and sodium citrate are The mass ratio of addition amount is 1:2...

Embodiment 2

[0039] A preparation method of nickel-coated graphite composite particles, the specific implementation steps are as follows:

[0040] Step 1: Place 1.5g of flake graphite matrix with a particle size of 100μm in 500ml of sodium hydroxide solution with a concentration of 100g / L for heating and stirring, the heating temperature is 60°C, and the stirring time is 45min. The graphite substrate was pretreated for degreasing and cleaning, and then placed in a vacuum drying box at 60 °C for 16 hours for use;

[0041] Step 2: Prepare an electroless nickel plating solution, and use a sodium hydroxide solution to adjust the pH of the plating solution to 12.5. In the plating solution, the nickel sulfate concentration is 20g / L, the potassium sodium tartrate concentration is 15g / L, the sodium citrate concentration is 52.5g / L, and the hydrazine hydrate concentration is 15g / L. In this embodiment, potassium sodium tartrate and sodium citrate are added. The mass-to-mass ratio is 1:3.5.

[0042...

Embodiment 3

[0045] A preparation method of nickel-coated graphite composite particles, the specific implementation steps are as follows:

[0046] Step 1: The flake graphite matrix with a particle size of 150 μm was placed in 500 ml of sodium hydroxide solution with a concentration of 95 g / L for heating and stirring, the heating temperature was 70 °C, and the stirring time was 45 min. After finishing the degreasing and cleaning pretreatment, it was then placed in a vacuum drying box at 60 °C for 16 hours for use;

[0047] Step 2: Prepare an electroless nickel plating solution, and use a sodium hydroxide solution to adjust the pH of the plating solution to 13. In the plating bath, the nickel sulfate concentration is 45g / L, the potassium sodium tartrate concentration is 24g / L, the sodium citrate concentration is 96g / L, and the hydrazine hydrate concentration is 22g / L. In this embodiment, the potassium sodium tartrate and the sodium citrate addition are The mass ratio is 1:4.

[0048] Step ...

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Abstract

The invention discloses a preparation method of nickel-coated graphite composite particles and application of the nickel-coated graphite composite particles in the field of electromagnetic shielding, and belongs to the technical field of preparation of electromagnetic wave shielding materials. By adjusting the content ratio of the two complexing agents, namely the sodium potassium tartrate tetrahydrate and the sodium citrate, the purpose of stabilizing the chemical nickel plating reaction rate is achieved, and it is ensured that a nickel plating layer with a high conductive path, high adhesive force and low internal stress is obtained after the reaction; and the problems of loose plating layer, poor plating solution stability and the like caused by uncontrollable reaction rate in the chemical nickel plating process are avoided. Meanwhile, hydrazine hydrate is adopted as a reducing agent, a pure nickel coating is obtained, and the problem that in the prior art, due to the fact that an amorphous coating containing impurity elements such as phosphorus and boron is formed, the electromagnetic performance is poor is solved. Besides, the traditional sensitization and activation process is omitted, the preparation process is simple, the period is short, the cost is low, the product performance is excellent, and a set of feasible new scheme is provided for promoting industrial production and application of the multi-specification and high-quality nickel-coated graphite composite particles.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave shielding material preparation, in particular to a preparation method of nickel-coated graphite composite particles and its application in the field of electromagnetic shielding. Background technique [0002] The wide use of various electronic devices in daily life not only brings users a convenient and efficient use experience, but also continuously radiates electromagnetic waves of various frequencies and wavelengths, causing serious electromagnetic wave pollution. This will not only interfere with some sensitive electronic devices and affect their normal operation, but also cause irreversible damage to the human body and other organisms. Therefore, high-performance electromagnetic wave shielding materials have become an urgent need for new materials to solve such problems. [0003] In recent years, due to the excellent electrical and magnetic conductivity of metal nickel, it meets...

Claims

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Application Information

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IPC IPC(8): B22F1/18C23C18/18C23C18/34H05K9/00
CPCC23C18/1834C23C18/34H05K9/0081
Inventor 张雪峰李逸兴阮佳昌廖怡君
Owner NORTHEASTERN UNIV
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