PPS composite material for electromagnetic shielding shell of high-voltage connector and preparation method of PPS composite material

Abstract

The invention relates to the technical field of electromagnetic shielding materials, in particular to a PPS composite material for an electromagnetic shielding shell of a high-voltage connector and a preparation method thereof.The PPS composite material is prepared from, by weight, 30%-50% of PPS resin, 0.2%-1% of coupling agent, 0.5%-2% of black color master batch, 10%-30% of nickel-plated graphite, 2%-20% of stainless steel fiber, 0.2%-1% of silicone powder, 0.2% of antioxidant and 5%-35% of glass fiber; nickel metal with high magnetic conductivity and graphite with high magnetic loss are utilized to form a two-dimensional structure, so that the shielding effectiveness at the low-frequency band of electromagnetic waves is improved, and the relative magnetic conductivity can reach 3.0 or above under the scheme; and the conductivity of the material is improved by utilizing the high conductivity and high mechanical property of the stainless steel fiber, so that the shielding effectiveness of the electromagnetic wave high-frequency band is realized. According to the shielding effectiveness of the material in the scheme, the shielding effectiveness of a plate with the thickness of 2.5 mm can reach 70 db or above within the frequency band range of 10 Hz-2. 5 GHz.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic shielding materials, and in particular to a PPS composite material for an electromagnetic shielding shell of a high-voltage connector and a preparation method thereof. Background Art

[0002] With the trend of motor and electronic control integration in new energy vehicles, as well as the development trend of humanoid robots and other industries, the magnetic field interference (EMI) caused by the electric field will cause distortion and disorder of high-voltage current and control signals, thus bringing control risks to the final product. The metal + electroplating solution commonly used in the current shielding material solution leads to heavy products, high costs and long production cycles.

[0003] Foreign counterparts have a solution of using plastic + nickel-plated carbon fiber filling, but the shielding effectiveness of this solution can barely meet the requirements in the high frequency band (>130MHz), but it does not meet the requirements in the low frequency band. In addition, the price of nickel-plated carbon fiber is generally more than 500 yuan / kg. The high cost and shielding performance limit the promotion of this solution. Summary of the invention

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a PPS composite material for an electromagnetic shielding shell of a high-voltage connector and a preparation method thereof.

[0005] To achieve the above object, the embodiments of the present invention adopt the following technical solutions: On the one hand, the present invention provides a PPS composite material for an electromagnetic shielding shell of a high-voltage connector, which includes the following raw materials, calculated by percentage of the total weight of the raw materials: 30-50% PPS resin, 0.2-1% coupling agent, 0.5-2% black masterbatch, 10-30% nickel-plated graphite, 2-20% stainless steel fiber, 0.2-1% silicone powder, 0.2% antioxidant and 5-35% glass fiber.

[0006] In some embodiments, the melt index of the PPS resin is 500-800 g / 10 min.

[0007] In some embodiments, the coupling agent includes at least one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-mercaptopropyltriethoxysilane.

[0008] In some embodiments, the nickel content of the nickel-plated graphite is 50-70%, and the particle size of the nickel-plated graphite is 1-30 microns.

[0009] In some embodiments, the diameter of the stainless steel fiber is 2-20 microns.

[0010] In some embodiments, the antioxidant is tris[2,4-di-tert-butylphenyl]phosphite.

[0011] On the other hand, the present invention provides a method for preparing a PPS composite material for an electromagnetic shielding housing of a high-voltage connector, comprising the following steps: First, mix PPS resin, black masterbatch, nickel-plated graphite, stainless steel fiber, silicone powder and antioxidant, then add a coupling agent and glass fiber and mix them evenly, and then add them into an extruder to extrude a PPS composite material for an electromagnetic shielding housing of a high-voltage connector.

[0012] In some embodiments, the temperatures of the extruder from the first zone to the ninth zone are set to 280-290 °C, 285-310 °C, 295-310 °C, 295-310 °C, 275-295 °C, 275-295 °C, 275-295 °C, 295-305 °C, 280-300 °C in sequence, and the head temperature is 300-320 °C.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: Utilize nickel metal with high magnetic permeability to form a two-dimensional structure with graphite with high magnetic loss to improve the shielding effectiveness in the low-frequency band of electromagnetic waves. Under this scheme, the relative magnetic permeability can reach more than 3.0; utilize the high conductivity and high mechanical properties of stainless steel fibers to improve the conductivity of the material, thereby realizing the shielding effectiveness in the high-frequency band of electromagnetic waves. With the shielding effectiveness of the material of this scheme, in the frequency range of 10 Hz to 2.5 GHz, the shielding effectiveness of a 2.5-mm-thick plate can reach more than 70 dB. At the same time, using the PPS material of this scheme can maintain good mechanical properties, with a tensile strength > 150 MPa, an elongation at break > 2.0%, and a modulus of elasticity > 17 GPa; a flexural strength > 260 MPa, and a notched Izod impact strength > 11 kj / m2, ensuring that the shielding housing has good mechanical properties, vibration resistance, and high modulus of elasticity while meeting the electromagnetic shielding effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a graph showing the shielding effectiveness test of the PPS composite material prepared in Example 1 at a frequency of 10 Hz to 130 MHz; Figure 2 It is a graph showing the shielding effectiveness test of the PPS composite material prepared in Example 1 at a frequency of 10 Hz to 30 MHz.

[0015] Figure 3 It is a graph showing the shielding effectiveness test of the PPS composite material prepared in Example 1 at a frequency of 30 MHz to 2.5 GHz; Figure 4 It is a graph showing the shielding effectiveness test of the PPS composite material prepared in Example 1 at a frequency of 10 Hz to 2.5 GHz. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in some embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments provided by the present disclosure fall within the scope of protection of the present disclosure. Embodiment

[0017] A. Take 49.3% of PPS resin, 0.5% of coupling agent, 0.5% of black masterbatch, 12% of nickel-plated graphite, 15% of stainless steel fiber, 0.5% of silicone powder, 0.2% of antioxidant and 22% of glass fiber. Among them, the melt index of PPS resin is 500 g / 10 min, the coupling agent is γ-aminopropyltriethoxysilane, the nickel content of nickel-plated graphite is 50%, the particle size of nickel-plated graphite is 10 microns, the diameter of stainless steel fiber is 10 microns, and the antioxidant is tris[2,4-di-tert-butylphenyl]phosphite.

[0018] B. First, mix PPS resin, black masterbatch, nickel-plated graphite, stainless steel fiber, silicone powder and antioxidant, then add coupling agent and glass fiber and mix them evenly. Then add them into an extruder. The temperatures of the extruder from the first zone to the ninth zone are set as 280 °C, 285 °C, 295 °C, 295 °C, 275 °C, 275 °C, 275 °C, 295 °C, 280 °C in sequence, and the head temperature is 300 °C. Extrude to obtain a PPS composite material for the electromagnetic shielding housing of a high-voltage connector. Embodiment

[0019] A. Take 30.6% of PPS resin, 0.8% of coupling agent, 0.9% of black masterbatch, 19% of nickel-plated graphite, 18% of stainless steel fiber, 0.2% of silicone powder, 0.2% of antioxidant and 30.3% of glass fiber. Among them, the melt index of PPS resin is 600 g / 10 min, the coupling agent is γ-glycidyletheroxypropyltrimethoxysilane, the nickel content of nickel-plated graphite is 60%, the particle size of nickel-plated graphite is 20 microns, the diameter of stainless steel fiber is 8 microns, and the antioxidant is tris[2,4-di-tert-butylphenyl]phosphite.

[0020] B. First, mix PPS resin, black masterbatch, nickel-plated graphite, stainless steel fiber, silicone powder and antioxidant, then add coupling agent and glass fiber and mix them evenly. Then add them into an extruder. The temperatures of the extruder from the first zone to the ninth zone are set as 285 °C, 290 °C, 300 °C, 300 °C, 280 °C, 280 °C, 290 °C, 300 °C, 290 °C in sequence, and the head temperature is 310 °C. Extrude to obtain a PPS composite material for the electromagnetic shielding housing of a high-voltage connector. Embodiment

[0021] A. Take 40.6% of PPS resin, 1% of coupling agent, 1.2% of black masterbatch, 20% of nickel-plated graphite, 15% of stainless steel fiber, 0.8% of silicone powder, 0.2% of antioxidant and 21.2% of glass fiber. Among them, the melt index of PPS resin is 700 g / 10 min, the coupling agent is γ-mercaptopropyltriethoxysilane, the nickel proportion in nickel-plated graphite is 70%, the particle size of nickel-plated graphite is 30 microns, the diameter of stainless steel fiber is 20 microns, and the antioxidant is tris(2,4-di-tert-butylphenyl) phosphite.

[0022] B. First, mix PPS resin, black masterbatch, nickel-plated graphite, stainless steel fiber, silicone powder and antioxidant evenly, then add coupling agent and glass fiber and mix evenly. Then add them into an extruder. The temperatures of the extruder from the first zone to the ninth zone are set as 290 °C, 310 °C, 310 °C, 310 °C, 295 °C, 295 °C, 295 °C, 305 °C, 300 °C in sequence, and the head temperature is 320 °C. Extrude to obtain a PPS composite material for the electromagnetic shielding housing of a high-voltage connector. Example

[0023] A. Take 50% of PPS resin, 1% of coupling agent, 2% of black masterbatch, 20% of nickel-plated graphite, 18% of stainless steel fiber, 0.8% of silicone powder, 0.2% of antioxidant and 8% of glass fiber. Among them, the melt index of PPS resin is 800 g / 10 min, the coupling agent is γ-aminopropyltriethoxysilane, the nickel proportion in nickel-plated graphite is 55%, the particle size of nickel-plated graphite is 25 microns, the diameter of stainless steel fiber is 15 microns, and the antioxidant is tris(2,4-di-tert-butylphenyl) phosphite.

[0024] B. First, mix PPS resin, black masterbatch, nickel-plated graphite, stainless steel fiber, silicone powder and antioxidant evenly, then add coupling agent and glass fiber and mix evenly. Then add them into an extruder. The temperatures of the extruder from the first zone to the ninth zone are set as 287 °C, 302 °C, 308 °C, 305 °C, 292 °C, 295 °C, 290 °C, 300 °C, 290 °C in sequence, and the head temperature is 310 °C. Extrude to obtain a PPS composite material for the electromagnetic shielding housing of a high-voltage connector. Example

[0025] A. Take 36.8% of PPS resin, 0.3% of coupling agent, 1.1% of black masterbatch, 12.8% of nickel-plated graphite, 15.6% of stainless steel fiber, 0.8% of silicone powder, 0.2% of antioxidant and 32.4% of glass fiber. Among them, the melt index of PPS resin is 550 g / 10 min, the coupling agent is γ-mercaptopropyltriethoxysilane, the nickel proportion in nickel-plated graphite is 62%, the particle size of nickel-plated graphite is 12 microns, the diameter of stainless steel fiber is 18 microns, and the antioxidant is tris(2,4-di-tert-butylphenyl) phosphite.

[0026] B. First, mix the PPS resin, black masterbatch, nickel-plated graphite, stainless steel fiber, silicone powder and antioxidant, then add the coupling agent and glass fiber and mix well, and then add them into an extruder. The temperatures of the extruder from the first zone to the ninth zone are set as 285 °C, 310 °C, 305 °C, 300 °C, 290 °C, 295 °C, 280 °C, 300 °C, 290 °C in sequence, and the head temperature is 310 °C. Extrusion gives a PPS composite material for the electromagnetic shielding housing of a high-voltage connector. Example

[0027] A. Take 40.8% of PPS resin, 0.8% of coupling agent, 1.6% of black masterbatch, 20% of nickel-plated graphite, 18% of stainless steel fiber, 0.6% of silicone powder, 0.2% of antioxidant and 18% of glass fiber. The melt index of the PPS resin is 650 g / 10 min, the coupling agent is γ-mercaptopropyltriethoxysilane, the nickel proportion of the nickel-plated graphite is 50%, the particle size of the nickel-plated graphite is 30 microns, the diameter of the stainless steel fiber is 20 microns, and the antioxidant is tris[2,4-di-tert-butylphenyl]phosphite.

[0028] B. First, mix the PPS resin, black masterbatch, nickel-plated graphite, stainless steel fiber, silicone powder and antioxidant, then add the coupling agent and glass fiber and mix well, and then add them into an extruder. The temperatures of the extruder from the first zone to the ninth zone are set as 290 °C, 310 °C, 310 °C, 310 °C, 295 °C, 295 °C, 295 °C, 305 °C, 300 °C in sequence, and the head temperature is 320 °C. Extrusion gives a PPS composite material for the electromagnetic shielding housing of a high-voltage connector.

[0029] As Figures 1 to 4 shown, the PPS composite material prepared in Example 1 was tested for shielding effectiveness by the waveguide method, and the test result shows that the shielding effectiveness can reach more than 70 dB.

[0030] In the description of this specification, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0031] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A PPS composite material for the electromagnetic shielding housing of a high-voltage connector, characterized in that, By weight percentage of the total weight of the raw materials, it includes the following raw materials: 30-50% of PPS resin, 0.2-1% of coupling agent, 0.5-2% of black masterbatch, 10-30% of nickel-plated graphite, 2-20% of stainless steel fiber, 0.2-1% of silicone powder, 0.2% of antioxidant and 5-35% of glass fiber.

2. The PPS composite material for the electromagnetic shielding housing of a high-voltage connector according to claim 1, wherein The melt index of the PPS resin is 500-800 g / 10 min.

3. The PPS composite material for the electromagnetic shielding housing of a high-voltage connector according to claim 1, characterized in that, The coupling agent includes at least one of γ-aminopropyltriethoxysilane, γ-glycidyletheroxypropyltrimethoxysilane and γ-mercaptopropyltriethoxysilane.

4. The PPS composite material for the electromagnetic shielding housing of a high-voltage connector according to claim 1, wherein, The nickel proportion of the nickel-plated graphite is 50-70%, and the particle size of the nickel-plated graphite is 1-30 microns.

5. The PPS composite material for the electromagnetic shielding housing of a high-voltage connector according to claim 1, characterized in that, The diameter of the stainless steel fiber is 2-20 microns.

6. The PPS composite material for the electromagnetic shielding housing of a high-voltage connector according to claim 1, wherein, The antioxidant is tris[2,4-di-tert-butylphenyl]phosphite.

7. A preparation method of a PPS composite material for an electromagnetic shielding housing of a high-voltage connector as described in any one of claims 1 to 6, characterized in that, It includes the following steps: First, mix the PPS resin, black masterbatch, nickel-plated graphite, stainless steel fiber, silicone powder and antioxidant, then add the coupling agent and glass fiber and mix them evenly, and then add them into an extruder to extrude a PPS composite material for the electromagnetic shielding housing of a high-voltage connector.

8. The preparation method according to claim 7, characterized in that, The temperatures of the extruder from the first zone to the ninth zone are set in sequence as 280-290 °C, 285-310 °C, 295-310 °C, 295-310 °C, 275-295 °C, 275-295 °C, 275-295 °C, 295-305 °C, 280-300 °C, and the head temperature is 300-320 °C.

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