A wave-absorbing material with shape memory function and preparation method thereof

Abstract

The present invention provides a method for preparing an absorbing material with a shape memory function, comprising: calcining and activating pistachio shells at high temperature to obtain a porous carbon material, mixing the porous carbon material with 2-methylimidazole, zinc nitrate hexahydrate, and cobalt nitrate hexahydrate and calcining the porous carbon material to obtain a magnetic porous carbon material, uniformly mixing the material with an additive, a thermoplastic resin, and an elastomeric resin, utilizing a twin-screw extruder to fully and uniformly compound the base material and the mixed material to obtain a composite filament with absorbing properties, and finally performing 3D printing to obtain an absorbing material with a shape memory function. The absorbing material with a shape memory function prepared by the present invention can absorb incident electromagnetic waves at different angles. It is more in line with the demand for absorbing materials in the new era and has broad application prospects in the fields of intelligent materials such as chip protection, robot development, and wearable electronic devices.

Description

Technical field:

[0001] The present invention belongs to the field of intelligent wave-absorbing materials, and in particular relates to a wave-absorbing material with shape memory function and a preparation method thereof. Background technology:

[0002] With the promotion of informatization, the use of wireless transmission technology in electronic products is becoming more and more widespread. People live in a complex electromagnetic environment, and the non-thermal effects of the microwave mechanism have brought unnecessary troubles to people's physical health and daily life. At the same time, they interfere with the reception of signals by electronic equipment and chips, affecting the operation of electronic equipment. Therefore, the ability to attenuate or lose electromagnetic waves has great research value and broad application prospects. At present, absorbing materials are used to absorb or greatly reduce the electromagnetic wave energy received on their surfaces, thereby reducing the interference of electromagnetic waves. However, most of the existing absorbing materials are non-deformable fixed-shape materials, and the shape of the absorbing materials cannot be adaptively adjusted according to the incident angle of the electromagnetic wave, thereby limiting the applicable scenarios and scope of application of the absorbing materials. Based on this, the present invention provides an absorbing material with shape memory function and a preparation method thereof, thereby obtaining an absorbing material with shape memory effect, which can quickly respond to external drive and change shape to achieve the effect of absorbing electromagnetic waves from multiple angles. Summary of the invention:

[0003] The object of the present invention is to provide an absorbing material with shape memory function and a preparation method thereof in view of the deficiencies in the prior art, wherein the absorbing material can absorb electromagnetic waves incident at various angles.

[0004] (1) The present invention provides a method for preparing an absorbing material with shape memory function, comprising the following steps:

[0005] S1. preparing porous carbon materials;

[0006] S2. preparing a porous carbon material having magnetic properties;

[0007] S3, uniformly mixing the magnetic porous carbon material, the additive, the thermoplastic resin and the elastomer resin to obtain a mixed material;

[0008] S4, adding the mixed material into a twin-screw extruder for granulation and drawing to form a composite material wire;

[0009] S5. 3D printing the composite material filament to obtain an absorbing material with shape memory function.

[0010] Furthermore, in S1, the porous carbon material is an alkali-activated porous carbon material, and the preparation method includes:

[0011] S1.1. Wash, dry, crush, and acid-wash the carbon-rich pistachio shells to remove impurities, and then ball-mill to obtain a ball-milled powder.

[0012] S1.2. The ball-milled powder was heated to 900°C in a nitrogen atmosphere at a rate of 2°C / min and then kept at that temperature for 3 hours to obtain a pistachio shell-derived carbon material;

[0013] S1.3. Mix the pistachio shell-derived carbon material with potassium hydroxide, raise the temperature to 900°C at a heating rate of 2°C / min in a nitrogen atmosphere, and then keep the temperature for 3 hours to obtain a potassium hydroxide-activated porous carbon material.

[0014] Furthermore, S2 is specifically as follows: the porous carbon material prepared in S1 is mixed and dissolved with 2-methylimidazole, zinc nitrate hexahydrate and cobalt nitrate hexahydrate in deionized water and mechanically stirred, the resulting solution is centrifuged to obtain a precipitate, and the precipitate is washed several times with deionized water and ethanol, vacuum dried, and then heated to 900°C at a heating rate of 2°C / min in a nitrogen atmosphere and kept warm for 3 hours to obtain a porous carbon material with magnetic properties.

[0015] Furthermore, the weight ratio of the porous carbon material to 2-methylimidazole, zinc nitrate hexahydrate, cobalt nitrate hexahydrate and deionized water is 10:5:3:3:79;

[0016] Furthermore, in S3, the weight ratio of the porous carbon material having magnetic properties, the auxiliary agent, the thermoplastic resin and the elastomer resin is (5-6): (1-2): (8-10): (2-4).

[0017] Furthermore, in S3, the thermoplastic resin has a density of 1.24 g / cm 3 Polylactic acid resin (PLA); the elastomeric resin includes a density of 1.2g / cm 3 Polyurethane resin (TPU), density 1.3g / cm 3 Polyamide resin (PAE) and density 1.05g / cm 3 One or more polyolefin resins (TPO); the auxiliary agent consists of a plasticizer, a toughening agent and an antioxidant.

[0018] Furthermore, among the auxiliary agents, the plasticizer, toughening agent and antioxidant each account for 20% to 50% of the total weight of the auxiliary agent; the plasticizer is one or more of glycerol, castor oil, di(2-ethyl) phthalate and 2-ethylhexyl diphenyl phosphate; the antioxidant is one or two of triphosphite and pentaerythritol stearate; and the toughening agent is erucamide.

[0019] Furthermore, in the S4, the twin-screw extruder is divided into seven zones from the feed end to the discharge end, and the temperature is set as: 150℃~170℃ in the first zone, 160℃~180℃ in the second zone, 170℃~180℃ in the third zone, 180℃~190℃ in the fourth zone, 190℃~200℃ in the fifth zone, 200℃~205℃ in the sixth zone, and 200℃~210℃ in the seventh zone; the aspect ratio of the twin-screw extruder is 20:1, and the speed is 60-120r / min; and granulation adopts water-cooled hot-cut granulation.

[0020] Furthermore, the S5 is specifically as follows: adding the composite material filament into the 3D printer, controlling the nozzle temperature to 220° C., the platform temperature to 60° C., setting the model to a 5 cm×4 cm×0.5 cm flat plate, and printing to obtain an absorbing material with shape memory function.

[0021] Furthermore, in S1.1, the ball-to-material ratio is set at 75:1, the rotation speed is 500 r / min, and the time is 30 min; the diameter of the agate balls in the ball mill is 8 mm; and in S1.3, the weight ratio of the pistachio shell-derived carbon material to potassium hydroxide is (4-5): (5-6).

[0022] Furthermore, the mechanical stirring speed is 50-80 rpm, the stirring time is 2 hours, and the vacuum drying temperature is 70°C.

[0023] (2) The present invention also provides a wave-absorbing material with shape memory function, which is prepared by the preparation method described above.

[0024] Beneficial effects of the present invention:

[0025] (1) The present invention provides an absorbing material with shape memory function, which has excellent absorbing efficiency and excellent shape memory performance. According to the special properties of the shape memory absorbing material, the composite material can be deformed to electromagnetic waves at different angles, thereby absorbing electromagnetic waves at different incident angles. The material can be recycled and reused, fully meeting the needs of the current era for absorbing materials, and has important application value in wearable devices, robots, and chip protection, and has important practical significance for the application of absorbing materials in the future.

[0026] (2) The present invention uses pistachio nut shells as raw materials for preparation. On the one hand, it can promote the resource utilization of waste materials, and the materials are easy to obtain, which reduces production costs. On the other hand, it utilizes the excellent dielectric properties of its carbon skeleton to further explore its application value in the field of wave absorption. Description of the drawings:

[0027] Figure 1 Graph showing electromagnetic parameter test results for the embodiment of the present invention and the comparative example;

[0028] Figure 2 This is a graph showing the reflectivity of the composite material prepared in Example 1 of the present invention to electromagnetic waves incident at different angles;

[0029] Figure 3 This is a diagram showing the shape memory effect of the composite material prepared in Example 1 of the present invention. Specific implementation method:

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1

[0032] This embodiment provides a wave-absorbing material with shape memory function, the raw material composition is: density 1.24g / cm 3 45 parts of polylactic acid resin with a density of 1.3g / cm 3 The invention relates to a method for preparing a magnetic porous carbon material comprising: 10 parts of polyurethane resin, 10 parts of auxiliary agent, and 25 parts of magnetic porous carbon material. The auxiliary agent comprises a plasticizer (castor oil), a toughening agent (erucamide), and an antioxidant (triphosphite), with the weight percentages being 30%, 40%, and 30%, respectively.

[0033] The preparation method comprises the following steps:

[0034] Step 1: preparing porous carbon material;

[0035] (1) Carbon-rich pistachio shells were sequentially washed, dried, crushed, and acid-washed to remove impurities, and then added to a ball mill for ball milling to obtain ball-milled powder. The ball-to-material ratio was set at 75:1, the rotation speed was 500 r / min, the time was 30 min, and the diameter of the agate balls in the ball mill was 8 mm;

[0036] (2) heating the ball-milled powder to 900°C in a nitrogen atmosphere at a heating rate of 2°C / min and then maintaining the temperature for 3 hours to obtain a pistachio shell-derived carbon material;

[0037] (3) The pistachio shell-derived carbon material and potassium hydroxide were mixed in a weight ratio of 4:5, and the temperature was raised to 900°C at a heating rate of 2°C / min in a nitrogen atmosphere and then kept at that temperature for 3 hours to obtain a potassium hydroxide-activated porous carbon material.

[0038] Step 2: preparing a porous carbon material with magnetic properties;

[0039] The porous carbon material prepared in step 1 was mixed with 2-methylimidazole, zinc nitrate hexahydrate and cobalt nitrate hexahydrate and dissolved in deionized water with mechanical stirring for 2 hours (speed of 50-80 rpm). The resulting solution was centrifuged to obtain a precipitate, which was washed several times with deionized water and ethanol, dried in a vacuum oven at 70°C overnight, and then heated to 900°C at a heating rate of 2°C / min under a nitrogen atmosphere and kept warm for 3 hours to obtain a porous carbon material with magnetic properties.

[0040] The weight ratio of the porous carbon material to 2-methylimidazole, zinc nitrate hexahydrate, cobalt nitrate hexahydrate and deionized water is 10:5:3:3:79.

[0041] Step 3: preparing a mixed material;

[0042] By weight, 25 parts of a porous carbon material having magnetic properties, 10 parts of an auxiliary agent, 45 parts of a thermoplastic resin and 10 parts of an elastomer resin are uniformly mixed to obtain a mixed material.

[0043] Step 4: Prepare composite material wire.

[0044] The mixed material is added into a twin-screw extruder for water-cooling, hot-cutting, granulation and drawing to form composite material filaments.

[0045] The twin-screw extruder is divided into seven zones from the feed end to the discharge end, and the temperatures are set as follows: 150°C in the first zone, 160°C in the second zone, 170°C in the third zone, 180°C in the fourth zone, 190°C in the fifth zone, 200°C in the sixth zone, and 200°C in the seventh zone; the length-to-diameter ratio of the twin-screw extruder is 20:1, and the speed is 60-120r / min.

[0046] Step 5: 3D printing to prepare absorbing materials with shape memory function

[0047] The composite material filament was added to the 3D printer, the nozzle temperature was controlled at 220°C, the platform temperature was 60°C, the model was set to a 5cm×4cm×0.5cm flat plate, and the absorbing material with shape memory function was printed.

[0048] Example 2

[0049] This embodiment provides a wave-absorbing material with shape memory function, the raw material composition is: density 1.24g / cm 3 40 parts of polylactic acid resin, density 1.3g / cm 3 The invention is composed of 15 parts of polyurethane resin, 8 parts of auxiliary agents, and 30 parts of magnetic porous carbon material. The auxiliary agents are composed of a plasticizer (di(2-ethyl) phthalate), a toughening agent (erucamide), and an antioxidant (pentaerythritol stearate), with the weight percentages being 40%, 25%, and 35%, respectively.

[0050] The preparation method comprises the following steps:

[0051] Step 1: preparing porous carbon material;

[0052] (1) Carbon-rich pistachio shells were sequentially washed, dried, crushed, and acid-washed to remove impurities, and then added to a ball mill for ball milling to obtain ball-milled powder. The ball-to-material ratio was set at 75:1, the rotation speed was 500 r / min, the time was 30 min, and the diameter of the agate balls in the ball mill was 8 mm;

[0053] (2) heating the ball-milled powder to 900°C in a nitrogen atmosphere at a heating rate of 2°C / min and then maintaining the temperature for 3 hours to obtain a pistachio shell-derived carbon material;

[0054] (3) The pistachio shell-derived carbon material and potassium hydroxide were mixed in a weight ratio of 5:6, and the temperature was raised to 900°C at a heating rate of 2°C / min in a nitrogen atmosphere and then kept warm for 3 hours to obtain a potassium hydroxide-activated porous carbon material.

[0055] Step 2: preparing a porous carbon material with magnetic properties;

[0056] The porous carbon material prepared in step 1 was mixed with 2-methylimidazole, zinc nitrate hexahydrate and cobalt nitrate hexahydrate and dissolved in deionized water with mechanical stirring for 2 hours (speed of 50-80 rpm). The resulting solution was centrifuged to obtain a precipitate, which was washed several times with deionized water and ethanol, dried in a vacuum oven at 70°C overnight, and then heated to 900°C at a heating rate of 2°C / min under a nitrogen atmosphere and kept warm for 3 hours to obtain a porous carbon material with magnetic properties.

[0057] The weight ratio of the porous carbon material to 2-methylimidazole, zinc nitrate hexahydrate, cobalt nitrate hexahydrate and deionized water is 10:5:3:3:79.

[0058] Step 3: preparing a mixed material;

[0059] By weight, 30 parts of a porous carbon material having magnetic properties, 8 parts of an auxiliary agent, 40 parts of a thermoplastic resin and 15 parts of an elastomer resin are uniformly mixed to obtain a mixed material.

[0060] Step 4: Prepare composite material wire.

[0061] The mixed material is added into a twin-screw extruder for water-cooling, hot-cutting, granulation and drawing to form composite material filaments.

[0062] The twin-screw extruder is divided into seven zones from the feed end to the discharge end, and the temperature is set as: 160°C in the first zone, 180°C in the second zone, 190°C in the third zone, 190°C in the fourth zone, 200°C in the fifth zone, 205°C in the sixth zone, and 210°C in the seventh zone; the length-to-diameter ratio of the twin-screw extruder is 20:1, and the speed is 60-120r / min.

[0063] Step 5: 3D printing to prepare absorbing materials with shape memory function

[0064] The composite material filament was added to the 3D printer, the nozzle temperature was controlled at 220°C, the platform temperature was 60°C, the model was set to a 5cm×4cm×0.5cm flat plate, and the absorbing material with shape memory function was printed.

[0065] Example 3

[0066] This embodiment provides a wave-absorbing material with shape memory function, the raw material composition is: density 1.24g / cm 3 50 parts of polylactic acid resin, density 1.05g / cm 3 The invention is composed of 20 parts of polyolefin resin, 5 parts of auxiliary agent, and 28 parts of magnetic porous carbon material. The auxiliary agent is composed of a plasticizer (2-ethylhexyl diphenyl phosphate), a toughening agent (erucamide), and an antioxidant (triphosphite), with the weight percentages being 20%, 40%, and 40%, respectively.

[0067] The preparation method comprises the following steps:

[0068] Step 1: Prepare porous carbon material.

[0069] (1) Carbon-rich pistachio shells were sequentially washed, dried, crushed, and acid-washed to remove impurities, and then added to a ball mill for ball milling to obtain ball-milled powder. The ball-to-material ratio was set at 75:1, the rotation speed was 500 r / min, the time was 30 min, and the diameter of the agate balls in the ball mill was 8 mm;

[0070] (2) heating the ball-milled powder to 900°C in a nitrogen atmosphere at a heating rate of 2°C / min and then maintaining the temperature for 3 hours to obtain a pistachio shell-derived carbon material;

[0071] (3) The pistachio shell-derived carbon material and potassium hydroxide were mixed in a weight ratio of 1:1, and the temperature was raised to 900°C at a heating rate of 2°C / min in a nitrogen atmosphere and then kept warm for 3 hours to obtain a potassium hydroxide-activated porous carbon material.

[0072] Step 2: Prepare porous carbon materials with magnetic properties.

[0073] The porous carbon material prepared in step 1 was mixed with 2-methylimidazole, zinc nitrate hexahydrate and cobalt nitrate hexahydrate and dissolved in deionized water with mechanical stirring for 2 hours (speed of 50-80 rpm). The resulting solution was centrifuged to obtain a precipitate, which was washed several times with deionized water and ethanol, dried in a vacuum oven at 70°C overnight, and then heated to 900°C at a heating rate of 2°C / min under a nitrogen atmosphere and kept warm for 3 hours to obtain a porous carbon material with magnetic properties.

[0074] The weight ratio of the porous carbon material to 2-methylimidazole, zinc nitrate hexahydrate, cobalt nitrate hexahydrate and deionized water is 10:5:3:3:79.

[0075] Step 3: Prepare the mixed material.

[0076] By weight, 28 parts of porous carbon material with magnetic properties, 5 parts of auxiliary agent, 50 parts of thermoplastic resin and 20 parts of elastomer resin were mixed uniformly to obtain a mixed material.

[0077] Step 4: Prepare composite material wire.

[0078] The mixed material is added into a twin-screw extruder for water-cooling, hot-cutting, granulation and drawing to form composite material filaments.

[0079] The twin-screw extruder is divided into seven zones from the feed end to the discharge end, and the temperatures are set as follows: 160°C in the first zone, 170°C in the second zone, 175°C in the third zone, 185°C in the fourth zone, 195°C in the fifth zone, 200°C in the sixth zone, and 205°C in the seventh zone; the length-to-diameter ratio of the twin-screw extruder is 20:1, and the speed is 60-120r / min.

[0080] Step 5: Prepare the absorbing material with shape memory function by 3D printing.

[0081] The composite material filament was added to the 3D printer, the nozzle temperature was controlled at 220°C, the platform temperature was 60°C, the model was set to a 5cm×4cm×0.5cm flat plate, and the absorbing material with shape memory function was printed.

[0082] Comparative Example 1

[0083] The preparation method of this comparative example is basically the same as that of Example 1, except that no elastomer resin is added.

[0084] Comparative Example 2

[0085] The preparation method of this comparative example is basically the same as that of Example 1, except that no absorbing filler (magnetic porous carbon material) is added.

[0086] Performance Testing

[0087] The composite materials prepared in Examples 1-3 and Comparative Examples 1-2 were tested for wave absorbing performance and shape memory effect.

[0088] The composite materials prepared in Examples 1-3 and Comparative Examples 1-2 were punched using a custom mold to produce rings with an inner diameter of 3.04 mm and an outer diameter of 7 mm. Electromagnetic parameters of all samples were measured using a vector network analyzer. The reflectivity of the composite material prepared in Example 1 was tested in an anechoic chamber for incident electromagnetic waves at different angles. The shape memory effect of the composite material was also tested using a static thermomechanical analyzer.

[0089] Figure 1 is the test result of electromagnetic parameters, where Figure 1 a is a schematic diagram of the dielectric real part of each embodiment and comparative example, Figure 1 b is a schematic diagram of the dielectric imaginary part of each embodiment and comparative example, Figure 1 c is a schematic diagram of the real part of the magnetic permeability of each embodiment and comparative example, Figure 1 d is a schematic diagram of the imaginary part of the magnetic permeability of each embodiment and comparative example. Figure 1 It can be seen that the real and imaginary parts of the magnetic permeability of the composite material without the addition of the absorbing filler (Comparative Example 2) are much smaller than those of the composite material with the addition of the absorbing filler, which proves that the absorbing filler prepared by the present invention has excellent absorbing performance.

[0090] Figure 2 is the reflectivity of the composite material prepared in Example 1 to electromagnetic waves incident at different angles, Figure 2 It can be seen that the composite material prepared by the present invention can absorb electromagnetic waves at different incident angles.

[0091] Table 1 shows the test results of the shape memory effect. It can be seen from Table 1 that adding the absorbing filler prepared by the present invention does not affect the shape memory effect of the material.

[0092] Figure 3 This is the shape memory effect diagram of the composite material prepared in Example 1. Figure 3 It can be seen that the composite material prepared by the present invention has excellent shape memory properties.

[0093] Table 1

[0094] Shape fixation rate (%) Shape recovery rate (%) Example 1 93 98 Example 2 90 96 Example 3 91 90 Comparative Example 1 (without elastomer resin) 97 100 Comparative Example 2 (no absorbing filler added) 87 94

[0095] The present invention provides a shape-memory absorbing material and its preparation method. A magnetic absorbing composite material is first prepared, and then an elastomer-reinforced polylactic acid shape-memory absorbing material is produced through 3D printing. The absorbing material prepared using this method exhibits excellent absorbing efficiency and shape-memory properties, allowing it to deform and adapt to electromagnetic waves at different angles, thereby absorbing electromagnetic waves at varying incident angles. The preparation method is simple, has a wide range of material sources, and is low-cost. It fully meets the current demand for absorbing materials and has important practical implications for the future application of absorbing materials.

[0096] The above are only preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the scope of protection of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications without departing from the principle of the present invention should be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a wave-absorbing material with shape memory function, characterized in that: The following steps are involved: S1. preparing porous carbon materials; S2. preparing a porous carbon material having magnetic properties; S3, uniformly mixing the magnetic porous carbon material, the additive, the thermoplastic resin and the elastomer resin to obtain a mixed material; S4, adding the mixed material into a twin-screw extruder for granulation and drawing to form a composite material wire; S5, performing 3D printing on the composite material filament to obtain an absorbing material with shape memory function; In S1, the porous carbon material is an alkali-activated porous carbon material, and the preparation method includes: S1.

1. Wash the pistachio shells, dry them, crush them, pickle them to remove impurities, and then ball-mill them to obtain ball-milled powder; S1.

2. The ball-milled powder was heated to 900°C in a nitrogen atmosphere at a rate of 2°C / min and then kept at that temperature for 3 hours to obtain a pistachio shell-derived carbon material; S1.3, mixing the pistachio shell-derived carbon material with potassium hydroxide, heating the temperature to 900°C at a rate of 2°C / min in a nitrogen atmosphere, and then maintaining the temperature for 3 hours to obtain a potassium hydroxide-activated porous carbon material; Specifically, S2 comprises the following steps: dissolving the porous carbon material prepared in S1 with 2-methylimidazole, zinc nitrate hexahydrate and cobalt nitrate hexahydrate in deionized water with mechanical stirring, centrifuging the resulting solution to obtain a precipitate, washing the precipitate with deionized water and ethanol several times, vacuum drying, and then heating the temperature to 900°C at a heating rate of 2°C / min under a nitrogen atmosphere and keeping the temperature for 3 hours to obtain a porous carbon material with magnetic properties.

2. The method for preparing a wave-absorbing material with shape memory function according to claim 1, wherein: The weight ratio of the porous carbon material to 2-methylimidazole, zinc nitrate hexahydrate, cobalt nitrate hexahydrate and deionized water is 10:5:3:3:

79.

3. The method for preparing a wave-absorbing material with shape memory function according to claim 1, wherein: In the S3, the weight ratio of the porous carbon material having magnetism, the auxiliary agent, the thermoplastic resin and the elastomer resin is (5-6): (1-2): (8-10): (2-4).

4. The method for preparing a wave-absorbing material with shape memory function according to claim 1, wherein: In S3, the thermoplastic resin is polylactic acid resin; the elastomer resin includes one or more of polyurethane resin, polyamide resin and polyolefin resin; and the auxiliary agent consists of a plasticizer, a toughening agent and an antioxidant.

5. The method for preparing a wave-absorbing material with shape memory function according to claim 4, wherein: Among the additives, the plasticizer, toughening agent and antioxidant each account for 20% to 50% of the total weight of the additive; The plasticizer is one or more of glycerol, castor oil, di(2-ethyl) phthalate and 2-ethylhexyl diphenyl phosphate; The antioxidant is one or both of triphosphite and pentaerythritol stearate; The toughening agent is erucamide.

6. The method for preparing a wave-absorbing material with shape memory function according to claim 1, wherein: In the S4, the twin-screw extruder is divided into seven zones from the feed end to the discharge end, and the temperature is set as follows: 150°C to 170°C in the first zone, 160°C to 180°C in the second zone, 170°C to 180°C in the third zone, 180°C to 190°C in the fourth zone, 190°C to 200°C in the fifth zone, 200°C to 205°C in the sixth zone, and 200°C to 210°C in the seventh zone; The length-to-diameter ratio of the twin-screw extruder is 20:1, and the rotation speed is 60-120 r / min; granulation adopts water-cooled hot-cut granulation.

7. The method for preparing a wave-absorbing material with shape memory function according to claim 1, wherein: The S5 is specifically as follows: adding the composite material filament into the 3D printer, controlling the nozzle temperature to 220° C., the platform temperature to 60° C., setting the model to a 5 cm×4 cm×0.5 cm flat plate, and printing to obtain an absorbing material with shape memory function.

8. A wave-absorbing material with shape memory function, characterized in that: Prepared by the preparation method according to any one of claims 1 to 7.

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