Polypropylene foam material with wave-absorbing function

Abstract

The invention relates to a polypropylene foam material with a wave-absorbing function, and belongs to the technical field of wave-absorbing materials. The polypropylene foam material with the wave-absorbing function is prepared from the following components in parts by mass: 75 to 85 parts of polypropylene resin, 15 to 25 parts of wave-absorbing filler, 3 to 4 parts of nucleating agent, 3.5 to 4.5 parts of foaming agent and 0.2 to 0.8 part of antioxidant, the preparation method of the wave-absorbing filler comprises the following steps: plating nickel on molybdenum disulfide to obtain nickel-plated molybdenum disulfide; and then the surface of the nickel-plated molybdenum disulfide is coated with copper in situ, and the wave-absorbing filler is obtained. The surface of molybdenum disulfide is sequentially coated with metal nickel, polydopamine and metal copper, the metal copper and the metal nickel can be tightly and evenly distributed on the surface of molybdenum disulfide, the metal copper and the metal nickel are tightly combined together through the polydopamine, the synergistic effect can be achieved, and the electric conductivity, the magnetic conductivity and the wave absorbing capacity are improved.

Description

Technical Field

[0001] The invention relates to a polypropylene foam material with wave absorbing function, belonging to the technical field of wave absorbing materials. Background Art

[0002] With the rapid development of modern science and technology, various electronic and electrical equipment are increasingly used in military, industrial and civilian fields, and the electromagnetic interference and electromagnetic radiation problems brought about by this are becoming more and more serious. In addition, with the progress of the electronic communications industry, equipment is moving towards miniaturization, and the requirements for materials are becoming higher and higher. Absorbing materials can absorb or greatly reduce the electromagnetic wave energy received on their surface, thereby reducing the interference of electromagnetic waves. Therefore, in recent years, absorbing materials have gradually become a research hotspot.

[0003] Polypropylene resin has the characteristics of light weight, excellent acid and alkali resistance and high cost performance. The foam material obtained by foaming polypropylene can greatly reduce the weight, and the foamed polypropylene can be recycled repeatedly to improve production efficiency. At the same time, the pore structure inside the foamed polypropylene can reflect the electromagnetic waves incident into the material, improve the impedance matching of the material, and achieve the effect of broadband absorption of electromagnetic waves. Therefore, polypropylene foam material has the potential to become an absorbing material with excellent comprehensive performance. At present, in order to improve the absorbing performance of polypropylene foam material, it is usually necessary to add a large amount of absorbing filler to the polypropylene matrix material. In order to obtain good absorbing performance, the amount of absorbing filler added is usually large, resulting in deviations in the mechanical properties of the absorbing polypropylene foam material. Therefore, it is necessary to develop a polypropylene foam material with both good mechanical properties and absorbing properties. Summary of the invention

[0004] The purpose of the present invention is to provide a polypropylene foam material with wave absorbing function, so as to provide a polypropylene foam material with good mechanical properties and wave absorbing properties.

[0005] The polypropylene foam material with wave-absorbing function of the present invention comprises the following components in parts by weight: 75-85 parts of polypropylene resin, 15-25 parts of wave-absorbing filler, 3-4 parts of nucleating agent, 3.5-4.5 parts of foaming agent and 0.2-0.8 parts of antioxidant; the preparation method of the wave-absorbing filler is as follows: nickel is plated on molybdenum disulfide to obtain nickel-plated molybdenum disulfide; and then copper is in-situ coated on the surface of the nickel-plated molybdenum disulfide to obtain the wave-absorbing filler.

[0006] Preferably, the method for nickel plating on molybdenum disulfide is as follows: immersing the molybdenum disulfide in a 15-30 g / L stannous chloride solution for 20-35 min for sensitization; then taking it out and immersing it in a 0.15-0.35 g / L palladium chloride solution for 20-35 min for activation, and then adding the activated molybdenum disulfide to a chemical nickel plating solution, mixing and reacting at 85-95° C. for 3-5 hours to obtain nickel-plated molybdenum disulfide; the mass ratio of the activated molybdenum disulfide to the chemical nickel plating solution is 1:(80-100).

[0007] Preferably, the method for in-situ coating of copper on the surface of nickel-plated molybdenum disulfide is as follows: a mixed solution consisting of nickel-plated molybdenum disulfide, Tris-HCl buffer solution and dopamine hydrochloride is mixed and reacted at room temperature for 12 to 24 hours to obtain a composite material; the composite material and copper acetate are then mixed in ethanol and allowed to stand, the supernatant is removed to obtain a sediment, and the sediment, sodium hypophosphite and ethanol are then mixed and reacted at 75 to 85° C. for 15 to 25 minutes to obtain an absorbing filler.

[0008] Preferably, the concentration of dopamine hydrochloride in the mixed solution is 3-5 g / L, and the concentration of nickel-plated molybdenum disulfide is 0.2-0.4 g / L.

[0009] Preferably, the mass ratio of the composite material, cupric acetate and sodium hypophosphite is 0.05:(0.5-0.55):(0.45-0.5).

[0010] Preferably, the foaming agent is azobisisobutyronitrile or azodicarbonamide.

[0011] Preferably, the nucleating agent is alum, titanium dioxide, calcium oxide, or magnesium oxide.

[0012] Preferably, the antioxidant is tris(2,4-di-tert-butylphenyl)phosphite, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate or n-octadecylβ-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

[0013] Preferably, the preparation method of the polypropylene foam material with wave absorbing function is as follows: each component is put into a twin-screw extruder, melt-extruded and granulated at 180-220°C to obtain a granular material; then the granular material is foamed under the action of carbon dioxide at a temperature of 165-175°C and a pressure of 3.5-4.5MPa to obtain a polypropylene foam material.

[0014] Preferably, the flake diameter of the molybdenum disulfide is 10 to 20 nm.

[0015] The beneficial effects of the polypropylene foam material with wave absorbing function of the present invention are as follows:

[0016] (1) The present invention sequentially coats metallic nickel, polydopamine and metallic copper on the surface of molybdenum disulfide, so that metallic copper and metallic nickel are tightly and evenly distributed on the surface of molybdenum disulfide. The two are tightly combined together through polydopamine, and can play a synergistic role to improve the electrical conductivity, magnetic permeability and wave absorption ability.

[0017] (2) The experimental results show that, compared with sequentially coating the surface of molybdenum disulfide with copper, polydopamine and nickel, or coating the surface of molybdenum disulfide with only nickel or copper, the absorbing filler obtained by sequentially coating the surface of molybdenum disulfide with nickel, polydopamine and copper can still obtain good absorbing performance even when a small amount is added to the polypropylene resin, thereby ensuring that the mechanical properties of the foamed polypropylene material are not reduced too much, and thus obtaining a polypropylene foam material with both good mechanical properties and absorbing properties. DETAILED DESCRIPTION

[0018] The following examples are intended to further illustrate the present invention rather than to limit the scope of protection of the present invention.

[0019] Example 1

[0020] The polypropylene foam material with wave absorbing function in this embodiment includes the following components by weight: 85 parts of polypropylene resin, 15 parts of wave absorbing filler, 3 parts of nucleating agent, 3.5 parts of foaming agent, and 0.2 parts of antioxidant. Among them, the nucleating agent is alum, the foaming agent is azobisisobutyronitrile, and the antioxidant is tris(2,4-di-tert-butylphenyl)phosphite. The preparation method of the wave absorbing filler is as follows:

[0021] (1) Molybdenum disulfide (with a flake diameter of 10 to 20 nm) is immersed in a 15 g / L stannous chloride solution for 20 min for sensitization; then, it is taken out and immersed in a 0.15 g / L palladium chloride solution for 35 min for activation; then, 1 g of the activated molybdenum disulfide is added to 100 g of chemical nickel plating solution, and stirred for reaction at 95° C. for 3 h. After the reaction is completed, the molybdenum disulfide is filtered, and the filter cake is rinsed with deionized water and vacuum dried to obtain nickel-plated molybdenum disulfide; the chemical nickel plating solution is prepared by mixing sodium citrate solution, ammonia water (with a concentration of 28 wt%), nickel sulfate and sodium hypophosphite, wherein the concentration of sodium citrate in the chemical nickel plating solution is 0.3 mol / L, the concentration of nickel sulfate is 0.6 mol / L, the concentration of sodium hypophosphite is 3.5 mol / L, and the pH of the chemical nickel plating solution is 7.5.

[0022] (2) Adding nickel-plated molybdenum disulfide to a Tris-HCl buffer solution for ultrasonic dispersion, and then adding dopamine hydrochloride to obtain a mixed solution; stirring the mixed solution for reaction at room temperature for 12 hours, filtering, washing the filter cake and drying to obtain a composite material; the concentration of dopamine hydrochloride in the mixed solution is 3 g / L, and the concentration of nickel-plated molybdenum disulfide is 0.4 g / L.

[0023] (3) Disperse 0.05 g of the composite material in 500 mL of ethanol solution, add 0.5 g of copper acetate and stir evenly after ultrasonic dispersion, let stand for 12 h, pour out the supernatant, add 500 mL of ethanol, heat to 85 ° C, add sodium hypophosphite solution (prepared by dissolving 0.45 g of sodium hypophosphite in 200 mL of ethanol), stir and react for 15 min, filter, wash and dry to obtain an absorbing filler.

[0024] The preparation method of the polypropylene foam material with wave absorbing function in this embodiment is as follows: each component is put into a twin-screw extruder, and the temperature is raised to 220° C. for melt extrusion and granulation to obtain a granular material; the granular material is then added to a high-pressure reactor, the temperature is controlled to 170° C., carbon dioxide is introduced to make the pressure in the high-pressure reactor reach 3.5 MPa, the temperature is maintained at 165° C., and foaming is performed so that the foaming multiple is greater than 20 times to obtain a polypropylene foam material.

[0025] Example 2

[0026] The polypropylene foam material with wave absorbing function in this embodiment includes the following components by weight: 75 parts of polypropylene resin, 25 parts of wave absorbing filler, 4 parts of nucleating agent, 4.5 parts of foaming agent, and 0.8 parts of antioxidant. Among them, the nucleating agent is titanium dioxide, the foaming agent is azodicarbonamide, and the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate. The preparation method of the wave absorbing filler is as follows:

[0027] (1) Molybdenum disulfide (with a flake diameter of 10 to 20 nm) is immersed in a 30 g / L stannous chloride solution for 35 min for sensitization; then it is taken out and immersed in a 0.35 g / L palladium chloride solution for 20 min for activation; then 1 g of the activated molybdenum disulfide is added to 80 g of chemical nickel plating solution, and stirred for reaction at 85° C. for 5 h. After the reaction is completed, the molybdenum disulfide is filtered, and the filter cake is rinsed with deionized water and vacuum dried to obtain nickel-plated molybdenum disulfide; the chemical nickel plating solution is prepared by mixing sodium citrate solution, ammonia water (with a concentration of 25 wt%), nickel sulfate and sodium hypophosphite, wherein the concentration of sodium citrate in the chemical nickel plating solution is 0.5 mol / L, the concentration of nickel sulfate is 0.4 mol / L, the concentration of sodium hypophosphite is 1.5 mol / L, and the pH of the chemical nickel plating solution is 10.

[0028] (2) Adding nickel-plated molybdenum disulfide to a Tris-HCl buffer solution for ultrasonic dispersion, and then adding dopamine hydrochloride to obtain a mixed solution; stirring the mixed solution for reaction at room temperature for 24 hours, filtering, washing the filter cake and drying to obtain a composite material; the concentration of dopamine hydrochloride in the mixed solution is 5 g / L, and the concentration of nickel-plated molybdenum disulfide is 0.2 g / L.

[0029] (3) 0.05 g of the composite material was fully dispersed in 500 mL of ethanol solution. After ultrasonic dispersion, 0.55 g of copper acetate was added and stirred evenly. After standing for 16 h, the supernatant was discarded, and 500 mL of ethanol was added. The mixture was heated to 75 ° C. and sodium hypophosphite solution (prepared by dissolving 0.5 g of sodium hypophosphite in 200 mL of ethanol) was added. The mixture was stirred for 25 min, filtered, washed, and dried to obtain an absorbing filler.

[0030] The preparation method of the polypropylene foam material with wave absorbing function in this embodiment is as follows: each component is put into a twin-screw extruder, and the temperature is raised to 200° C. for melt extrusion and granulation to obtain a granular material; the granular material is then added to a high-pressure reactor, the temperature is controlled to be 172° C., carbon dioxide is introduced to make the pressure in the high-pressure reactor reach 4.5 MPa, the temperature is maintained at 167° C., and foaming is performed so that the foaming multiple is greater than 20 times to obtain a polypropylene foam material.

[0031] Example 3

[0032] The polypropylene foam material with wave-absorbing function of this embodiment includes the following components by mass: 80 parts of polypropylene resin, 20 parts of wave-absorbing filler, 3-4 parts of nucleating agent, 4 parts of foaming agent, and 0.5 parts of antioxidant. Among them, the nucleating agent is calcium oxide, the foaming agent is azobisisobutylnitrile, and the antioxidant is β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-octadecyl alcohol ester. The preparation method of the wave-absorbing filler is as follows:

[0033] (1) Molybdenum disulfide (with a flake diameter of 10 to 20 nm) is immersed in a 20 g / L stannous chloride solution for 30 min for sensitization; then it is taken out and immersed in a 0.2 g / L palladium chloride solution for 25 min for activation; then 1 g of the activated molybdenum disulfide is added to 90 g of chemical nickel plating solution, and stirred for reaction at 90° C. for 4 h. After the reaction is completed, the molybdenum disulfide is filtered, and the filter cake is rinsed with deionized water and vacuum dried to obtain nickel-plated molybdenum disulfide; the chemical nickel plating solution is prepared by mixing sodium citrate solution, ammonia water (with a concentration of 26 wt%), nickel sulfate and sodium hypophosphite, wherein the concentration of sodium citrate in the chemical nickel plating solution is 0.4 mol / L, the concentration of nickel sulfate is 0.5 mol / L, the concentration of sodium hypophosphite is 2 mol / L, and the pH value of the chemical nickel plating solution is 8.

[0034] (2) Adding nickel-plated molybdenum disulfide to a Tris-HCl buffer solution for ultrasonic dispersion, and then adding dopamine hydrochloride to obtain a mixed solution; stirring the mixed solution for reaction at room temperature for 18 hours, filtering, washing the filter cake and drying to obtain a composite material; the concentration of dopamine hydrochloride in the mixed solution is 4 g / L, and the concentration of nickel-plated molybdenum disulfide is 0.3 g / L.

[0035] (3) 0.05 g of the composite material was fully dispersed in 500 mL of ethanol solution. After ultrasonic dispersion, 0.5 g of copper acetate was added and stirred evenly. After standing for 14 h, the supernatant was poured out, and 500 mL of ethanol was added. The mixture was heated to 80 ° C. and sodium hypophosphite solution (prepared by dissolving 0.5 g of sodium hypophosphite in 200 mL of ethanol) was added. The mixture was stirred for 20 min, filtered, washed, and dried to obtain an absorbing filler.

[0036] The preparation method of the polypropylene foam material with wave absorbing function of this embodiment is as follows: each component is put into a twin-screw extruder, and the temperature is raised to 215°C for melt extrusion and granulation to obtain a granular material; the granular material is then added to a high-pressure reactor, the temperature is controlled to 175°C, carbon dioxide is introduced to make the pressure in the high-pressure reactor reach 4MPa, the temperature is maintained at 168°C, and foaming is carried out so that the foaming multiple is greater than 20 times to obtain a polypropylene foam material.

[0037] Comparative Example 1

[0038] The preparation method of the wave-absorbing filler used in the polypropylene foam material with wave-absorbing function of this comparative example is as follows:

[0039] (1) Molybdenum disulfide (with a flake diameter of 10 to 20 nm) is added to a Tris-HCl buffer solution for ultrasonic dispersion, and then dopamine hydrochloride is added to obtain a mixed solution; the mixed solution is stirred for reaction at room temperature for 12 hours, filtered, and the filter cake is washed and dried to obtain a composite material; the concentration of dopamine hydrochloride in the mixed solution is 3 g / L, and the concentration of molybdenum disulfide is 0.4 g / L.

[0040] (2) 0.05 g of the composite material was fully dispersed in 500 mL of ethanol solution, and after ultrasonic dispersion, 0.5 g of copper acetate was added and stirred evenly. After standing for 12 h, the supernatant was poured out, and 500 mL of ethanol was added. The mixture was heated to 85 ° C, and a sodium hypophosphite solution (prepared by dissolving 0.45 g of sodium hypophosphite in 200 mL of ethanol) was added. The mixture was stirred for 15 min, filtered, washed, and dried to obtain a copper-coated material.

[0041] (3) The coated copper material is immersed in a 15 g / L stannous chloride solution for 20 min for sensitization; then taken out and immersed in a 0.15 g / L palladium chloride solution for 35 min for activation, and then 1 g of the activated molybdenum disulfide is added to 100 g of chemical nickel plating solution, and stirred for reaction at 95° C. for 3 h. After the reaction is completed, the filter is filtered, and the filter cake is rinsed with deionized water and vacuum dried to obtain an absorbing filler; the chemical nickel plating solution is prepared by mixing sodium citrate solution, ammonia water (concentration of 28 wt%), nickel sulfate and sodium hypophosphite, wherein the concentration of sodium citrate in the chemical nickel plating solution is 0.3 mol / L, the concentration of nickel sulfate is 0.6 mol / L, the concentration of sodium hypophosphite is 3.5 mol / L, and the pH of the chemical nickel plating solution is 7.5.

[0042] Comparative Example 2

[0043] The preparation method of the wave-absorbing filler used in the polypropylene foam material with wave-absorbing function of this comparative example is as follows:

[0044] (1) Molybdenum disulfide (with a flake diameter of 10 to 20 nm) is added to a Tris-HCl buffer solution for ultrasonic dispersion, and then dopamine hydrochloride is added to obtain a mixed solution; the mixed solution is stirred for reaction at room temperature for 12 hours, filtered, and the filter cake is washed and dried to obtain a composite material; the concentration of dopamine hydrochloride in the mixed solution is 3 g / L, and the concentration of molybdenum disulfide is 0.4 g / L.

[0045] (2) 0.05 g of the composite material was fully dispersed in 500 mL of ethanol solution. After ultrasonic dispersion, 0.5 g of copper acetate was added and stirred evenly. After standing for 12 h, the supernatant was poured out, and 500 mL of ethanol was added. The mixture was heated to 85 ° C. and sodium hypophosphite solution (prepared by dissolving 0.45 g of sodium hypophosphite in 200 mL of ethanol) was added. The mixture was stirred for 15 min, filtered, washed, and dried to obtain an absorbing filler.

[0046] Comparative Example 3

[0047] The preparation method of the wave-absorbing filler used in the polypropylene foam material with wave-absorbing function of this comparative example is as follows:

[0048] Molybdenum disulfide (with a sheet diameter of 10 to 20 nm) is immersed in a 30 g / L stannous chloride solution for 35 minutes for sensitization; then it is taken out and immersed in a 0.35 g / L palladium chloride solution for 20 minutes for activation, and then 1 g of the activated molybdenum disulfide is added to 80 g of chemical nickel plating solution, stirred and reacted at 85°C for 5 hours, filtered after the reaction is completed, the filter cake is rinsed with deionized water, and vacuum dried to obtain an absorbing filler; the chemical nickel plating solution is prepared by mixing sodium citrate solution, ammonia water (with a concentration of 25wt%), nickel sulfate and sodium hypophosphite, the concentration of sodium citrate in the chemical nickel plating solution is 0.5 mol / L, the concentration of nickel sulfate is 0.4 mol / L, the concentration of sodium hypophosphite is 1.5 mol / L, and the pH value of the chemical nickel plating solution is 10.

[0049] Experimental example

[0050] In order to evaluate the mechanical properties and wave absorbing properties of the polypropylene foam material with wave absorbing function of each embodiment and comparative example, the tensile strength, elongation at break, compressive strength and reflectivity (db) to different electromagnetic waves of the polypropylene foam material with wave absorbing function of each embodiment and comparative example were tested respectively. The results are shown in Table 1.

[0051] Table 1 Tensile strength, elongation at break, and compressive strength of the polypropylene foam material with wave absorbing function in each embodiment and comparative example

[0052] Polypropylene foam material Tensile strength(MPa) Elongation at break (%) Compression strength(MPa) Example 1 0.85 25 610 Example 2 0.83 23 607 Example 3 0.82 24 602 Comparative Example 1 0.78 22 597 Comparative Example 2 0.73 21 601 Comparative Example 3 0.75 23 593

[0053] Table 2 Reflectivity of the polypropylene foam material with wave absorbing function to different electromagnetic waves in each embodiment and comparative example

[0054]

[0055] As can be seen from Table 1-2, the wave-absorbing polypropylene foam material of the present invention has both excellent mechanical properties and wave-absorbing properties, and the reflectivity of electromagnetic waves increases with the increase of the frequency of electromagnetic waves, and when the frequency of electromagnetic waves is the same, the emissivity of the wave-absorbing polypropylene foam material of the present invention is significantly greater than the emissivity of the wave-absorbing polypropylene foam material of Comparative Examples 1-3. The above conclusion proves that: compared with sequentially coating metal nickel, polydopamine and metal copper on the surface of molybdenum disulfide, sequentially coating metal copper, polydopamine and metal nickel on the surface of molybdenum disulfide, or only coating metal nickel or metal copper on the surface of molybdenum disulfide, the reflectivity of the wave-absorbing polypropylene foam material can be further improved. This may be because metal copper and metal nickel are sequentially coated on the surface of molybdenum disulfide, which can play a synergistic role and improve electrical conductivity, magnetic permeability and wave-absorbing ability.

Claims

1. A polypropylene foam material with wave absorbing function, characterized in that: The invention comprises the following components in parts by weight: 75-85 parts of polypropylene resin, 15-25 parts of wave-absorbing filler, 3-4 parts of nucleating agent, 3.5-4.5 parts of foaming agent and 0.2-0.8 parts of antioxidant. The preparation method of the wave-absorbing filler is as follows: nickel is plated on molybdenum disulfide to obtain nickel-plated molybdenum disulfide; and copper is then in-situ coated on the surface of the nickel-plated molybdenum disulfide to obtain the wave-absorbing filler.

2. The polypropylene foam material with wave absorbing function as claimed in claim 1, characterized in that: The method for nickel plating on molybdenum disulfide is as follows: immersing the molybdenum disulfide in a 15-30g / L stannous chloride solution for 20-35min for sensitization; then taking it out and immersing it in a 0.15-0.35g / L palladium chloride solution for 20-35min for activation, and then adding the activated molybdenum disulfide to a chemical nickel plating solution, mixing and reacting at 85-95°C for 3-5h to obtain nickel-plated molybdenum disulfide; the mass ratio of the activated molybdenum disulfide to the chemical nickel plating solution is 1:(80-100).

3. The polypropylene foam material with wave absorbing function as claimed in claim 1, characterized in that: The method for in-situ coating of copper on the surface of nickel-plated molybdenum disulfide is as follows: a mixed solution consisting of nickel-plated molybdenum disulfide, Tris-HCl buffer solution and dopamine hydrochloride is mixed and reacted at room temperature for 12 to 24 hours to obtain a composite material; the composite material and copper acetate are then mixed in ethanol and allowed to stand, and the supernatant is removed to obtain a sedimentation material; the sedimentation material, sodium hypophosphite and ethanol are then mixed and reacted at 75 to 85° C. for 15 to 25 minutes to obtain an absorbing filler.

4. The polypropylene foam material with wave absorbing function as claimed in claim 3, characterized in that: The concentration of dopamine hydrochloride in the mixed solution is 3-5 g / L, and the concentration of nickel-plated molybdenum disulfide is 0.2-0.4 g / L.

5. The polypropylene foam material with wave absorbing function as claimed in claim 3, characterized in that: The mass ratio of the composite material, copper acetate and sodium hypophosphite is 0.05:(0.5-0.55):(0.45-0.5).

6. The polypropylene foam material with wave absorbing function according to any one of claims 1 to 5, characterized in that: The foaming agent is azobisisobutyronitrile or azodicarbonamide.

7. The polypropylene foam material with wave absorbing function according to any one of claims 1 to 5, characterized in that: The nucleating agent is alum, titanium dioxide, calcium oxide and magnesium oxide.

8. The polypropylene foam material with wave absorbing function according to any one of claims 1 to 5, characterized in that: The antioxidant is tris(2,4-di-tert-butylphenyl)phosphite, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] or n-octadecylβ-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

9. The polypropylene foam material with wave absorbing function according to any one of claims 1 to 5, characterized in that: The preparation method of the polypropylene foam material with wave absorbing function is as follows: each component is put into a twin-screw extruder, melt-extruded and granulated at 180-220° C. to obtain a granular material; and the granular material is foamed under the action of carbon dioxide at a temperature of 165-175° C. and a pressure of 3.5-4.5 MPa to obtain a polypropylene foam material.

10. The polypropylene foam material with wave absorbing function according to any one of claims 1 to 5, characterized in that: The sheet diameter of the molybdenum disulfide is 10 to 20 nm.

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