A method for preparing a glue-free self-bonding lightweight high-strength intelligent stealth structural material

Abstract

The invention discloses a method for preparing a non-glue self-bonding lightweight high-strength intelligent stealth structural material, comprising: using multi-walled carbon nanotubes as a shaping plate, spraying out electromagnetic shielding material polyetheretherketone using electrospinning technology, stretching the polyetheretherketone into a mesh structure, and then adding a mixture of multi-walled carbon nanotubes and powdered sugar into a mesh polyetheretherketone mold, and then subjecting the mold to heat preservation and curing treatment to solidify the mixture of multi-walled carbon nanotubes, powdered sugar and polyetheretherketone in the mold. Since polyetheretherketone has a good electromagnetic shielding effect, and the polyetheretherketone of the invention is arranged in a mesh structure, it has good air permeability, thereby producing a strong heat dissipation effect, and since the multi-walled carbon nanotubes have good thermal conductivity, the two mixtures have good electromagnetic shielding performance, thereby achieving a good stealth effect, and the mixture has good heat dissipation performance.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic shielding, and in particular to a method for preparing a glue-free self-bonding lightweight high-strength intelligent stealth structural material. Background Art

[0002] Electromagnetic waves are the main way of electromagnetic energy propagation. When high-frequency circuits are working, they will radiate electromagnetic waves outward, causing interference to other nearby devices. On the other hand, various electromagnetic waves in space will also be induced into the circuit, causing interference to the circuit. The role of electromagnetic shielding is to cut off the propagation path of electromagnetic waves, thereby eliminating interference. Among the many means to solve the problem of electromagnetic interference, electromagnetic shielding is the most basic and effective.

[0003] Radar detection technology is essentially a high-frequency electromagnetic wave emission and reception technology. Radar waves are generated by self-excitation, and directly transmit radio frequency electromagnetic waves to the road surface and subgrade. The sampling signal of the road surface and subgrade is obtained through wave reflection and reception, and the detection results are obtained through hardware, software and graphic display systems, so that the stealth effect can be achieved by only electromagnetic shielding.

[0004] Among the existing materials, polyetheretherketone resin has been widely used in aerospace, electronic information, transportation, energy and chemical industries due to its excellent comprehensive performance. The demand for electromagnetic shielding materials has promoted the development of corresponding science and technology and attracted widespread attention from scientists. However, most scientists have made polyetheretherketone into films with electromagnetic shielding properties, which makes it unable to dissipate heat and has limited electromagnetic shielding effect. It is necessary to stack more films to increase the electromagnetic shielding effect. Summary of the invention

[0005] The present invention overcomes the deficiencies of the prior art and provides a method for preparing a glue-free self-bonding lightweight high-strength intelligent stealth structural material.

[0006] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is: a method for preparing a non-adhesive self-bonding lightweight high-strength intelligent stealth structural material, characterized in that it comprises:

[0007] S1: preparing polyetheretherketone into polyetheretherketone polymer, ejecting the polyetheretherketone polymer from a syringe by electrospinning to form a non-woven mesh fiber felt on a receiving device, and then placing the non-woven mesh fiber felt in a mold;

[0008] S2: Mix the multi-walled carbon nanotubes and powdered sugar, stir them, and add the stirred mixture into the mold in S1;

[0009] S3: heat-insulating and curing the mold in S2 to solidify the mixture in the mold, then taking out the solidified mixture, putting it into water, heating it, taking out the mixture, filtering, washing and drying it;

[0010] S4: Put the product obtained in S3 into the mold again, add wood powder into the mold and vibrate it, and then perform hot pressing.

[0011] In a preferred embodiment of the present invention, the electrospinning parameters are: using an electrode of 20KV-25KV, a propulsion speed of 0.2ml / h-0.6ml / h, and an electrode distance of 8cm-12cm.

[0012] In a preferred embodiment of the present invention, the stirring parameter in S2 is stirring using a folding stirrer, the stirring parameter speed is 1000r / min-2000r / min, and the time is 30min-60min.

[0013] In a preferred embodiment of the present invention, the powdered sugar is agarose powder.

[0014] In a preferred embodiment of the present invention, the heat preservation and curing treatment in S3 heats the temperature inside the mold to 70° C.-80° C., and then continues the heat preservation treatment.

[0015] In a preferred embodiment of the present invention, the heating treatment in S3 continuously heats the water to 65° C.-70° C., and then performs a heat preservation operation for 1 h-1.5 h.

[0016] In a preferred embodiment of the present invention, the ratio of multi-walled carbon nanotubes to powdered sugar in S2 is 1:5.

[0017] In a preferred embodiment of the present invention, the vibration operation in S4 is to place the mold on an ultrasonic vibration screen and start the ultrasonic vibration screen while adding wood powder.

[0018] In a preferred embodiment of the present invention, the hot pressing operation in S4 is performed after the wood powder completely fills the mold, and the parameters are 3MPa-5MPa pressure and 80°C-100°C temperature for 50min-70min.

[0019] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0020] (1) The present invention is a method for preparing a glue-free self-bonding lightweight high-strength intelligent stealth structural material. By using multi-walled carbon nanotubes as a shaping plate and electrospinning to stretch polyetheretherketone into a mesh structure and bond it, the agglomeration of polyetheretherketone is effectively avoided, forming a mixture with multi-walled carbon nanotubes and mesh polyetheretherketone as a skeleton and wood powder as a filler, so that it has a strong electromagnetic shielding effect and a good heat dissipation effect. In addition, wood powder is added between the mixture of polyetheretherketone and multi-walled carbon nanotubes as a filler, thereby increasing the fiber feel of the mixture and allowing the wood powder to completely replace the glue.

[0021] (2) The present invention uses an electrospinning process to make polyetheretherketone into a mesh structure and adheres it to multi-walled carbon nanotubes, so that the formation of agglomeration is effectively avoided. Since multi-walled carbon nanotubes have good thermal conductivity and polyetheretherketone has a mesh structure with good heat dissipation and electromagnetic shielding effects, the mixture can electromagnetically shield objects with higher temperatures to achieve a stealth effect, and can also achieve a heat dissipation effect, thereby avoiding the situation where the existing electromagnetic shielding polyetheretherketone film cannot dissipate heat.

[0022] (3) The present invention uses sugar powder to fill the gaps at the intersection of the mixture of polyetheretherketone and multi-walled carbon nanotubes in series, so that the sugar powder plays a role similar to blood vessels to fill the mixture in series in all directions, so that the mixture fits more closely and the connection is deeper, and at the same time, space is reserved for wood powder. After the hot pressing is completed, the wood powder replaces the sugar powder, which again increases the fiber feel of the mixture, so that the mixture is completely fitted together, and at the same time, the wood powder replaces the glue, so that it achieves a glue-free and environmentally friendly effect.

[0023] (4) The present invention mixes polyetheretherketone with multi-walled carbon nanotubes and then uses wood powder for filling and hot pressing to form, so that different three-dimensional structures can be made according to specific usage scenarios instead of a single-layer film, thereby effectively avoiding the need to continuously stack layers of films to increase the electromagnetic shielding performance. The present application can form an electromagnetic shielding effect on staggered planes on the three-dimensional structure, thereby achieving the goal of reducing the thickness while increasing the electromagnetic shielding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 is a flow chart of a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the present invention.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0028] like Figure 1 As shown, a method for preparing a non-adhesive self-bonding lightweight high-strength intelligent stealth structural material comprises:

[0029] S1: preparing polyetheretherketone into polyetheretherketone polymer, ejecting the polyetheretherketone polymer from a syringe by electrospinning to form a non-woven mesh fiber felt on a receiving device, and then placing the non-woven mesh fiber felt in a mold;

[0030] In a preferred embodiment of the present invention, the electrospinning parameters are: using an electrode of 20KV-25KV, a propulsion speed of 0.2ml / h-0.6ml / h, and an electrode distance of 8cm-12cm.

[0031] It should be noted that polyetheretherketone is subjected to nucleophilic condensation treatment using difluorobenzophenone and hydroquinone to prepare a polyetheretherketone polymer, and then the polyetheretherketone polymer is placed in an electrospinning nozzle, and then the electrospinning nozzle is placed at an electrode of 20KV-25KV, and the propulsion speed is within the range of 0.2ml / h-0.6ml / h for spraying, and the electrode distance is 8cm-12cm. After many experiments, polyetheretherketone is electrospun using these parameters, and an object with a mesh structure formed by a polyetheretherketone polymer similar to a mesh fiber felt with a uniform texture can be obtained, and polyetheretherketone has a good electromagnetic shielding effect, so that the object achieves a good electromagnetic shielding effect, and because of its mesh structure, it has good air permeability.

[0032] S2: Mix the multi-walled carbon nanotubes and powdered sugar, stir them, and add the stirred mixture into the mold in S1;

[0033] In a preferred embodiment of the present invention, the stirring parameter in S2 is stirring using a folding stirrer, the stirring parameter speed is 1000r / min-2000r / min, and the time is 30min-60min.

[0034] In a preferred embodiment of the present invention, the powdered sugar is agarose powder.

[0035] In a preferred embodiment of the present invention, the ratio of multi-walled carbon nanotubes to powdered sugar in S2 is 1:5.

[0036] It should be noted that the multi-walled carbon nanotubes and powdered sugar are stirred using a folding stirrer with stirring parameters of a rotation speed of 1000r / min-2000r / min and a time of 30min-60min, so that the multi-walled carbon nanotubes and powdered sugar are mixed, and the powdered sugar can be evenly distributed on the multi-walled carbon nanotubes under long-term stirring. The powdered sugar is agarose powder, which has a low melting point and low requirements for equipment, making it easier to melt and more convenient to operate.

[0037] S3: heat-insulating and curing the mold in S2 to solidify the mixture in the mold, then taking out the solidified mixture, putting it into water, heating it, taking out the mixture, filtering, washing and drying it;

[0038] In a preferred embodiment of the present invention, the heat preservation and curing treatment in S3 heats the temperature inside the mold to 70° C.-80° C., and then continues the heat preservation treatment.

[0039] It should be noted that the mold in S2 is heated to a temperature of 70°C-80°C and then subjected to a heat preservation curing treatment method in which the temperature in the mold is continuously kept warm. During the heat preservation curing treatment, since the melting point of sugar powder is about 65°C, when the temperature in the mold rises to 65°C, the sugar powder begins to melt. When the heat preservation operation lasts for 1h-1.5h, the sugar powder is completely melted. At this time, the multi-walled carbon nanotubes and polyetheretherketone are completely bonded together to form a mixture with multi-walled carbon nanotubes and polyetheretherketone as the skeleton. Since polyetheretherketone has a network structure, the multi-walled carbon nanotubes have both the inherent properties of carbon materials and the electrical and thermal conductivity of metal materials, so that when they are superimposed on polyetheretherketone , with good heat dissipation performance, and during the heat preservation and curing treatment, since the powdered sugar is made of agarose powder, the melting point of agarose powder is low and it is easier to melt. After the agarose powder melts, it is in liquid form, which can well fill the gaps on the mixture with multi-walled carbon nanotubes and polyetheretherketone as the skeleton, thereby making its structure compact and full, and under long-term high-temperature insulation, the multi-walled carbon nanotubes are at the critical value of melting and are slightly viscous, while the powdered sugar is in liquid form, so that the multi-walled carbon nanotubes and polyetheretherketone are attached to form a skeleton of multi-walled carbon nanotubes and polyetheretherketone, and the liquid powdered sugar fills the gaps in the overlapping parts of the two, and then cools and solidifies.

[0040] In a preferred embodiment of the present invention, the heating treatment in S3 continuously heats the water to 65° C.-70° C., and then performs a heat preservation operation for 1 h-1.5 h.

[0041] It should be noted that after cooling and solidification, the multi-walled carbon nanotubes and polyetheretherketone are completely bonded and solidified into one body, and the powdered sugar fills the gaps at the intersection of the two. Then, the mixture filled with powdered sugar with multi-walled carbon nanotubes and polyetheretherketone as the skeleton is heated to continuously heat the water to 65℃-80℃, and then kept warm for 1h-1.5h. With the long-term heating and insulation treatment at 65℃-70℃, the powdered sugar melts, but the multi-walled carbon nanotubes do not reach the critical value of melting, so that the multi-walled carbon nanotubes will not be separated from the polyetheretherketone. After the powdered sugar melts, filtering, washing and drying operations are performed to filter out the powdered sugar, and then washing and drying operations are performed to rinse the remaining powdered sugar, and then drying is performed.

[0042] S4: Put the product obtained in S3 into the mold again, add wood powder into the mold and vibrate it, and then perform hot pressing.

[0043] In a preferred embodiment of the present invention, the vibration operation in S4 is to place the mold on an ultrasonic vibration screen and start the ultrasonic vibration screen while adding wood powder.

[0044] In a preferred embodiment of the present invention, the hot pressing operation in S4 is performed after the wood powder completely fills the mold, and the parameters are 3MPa-5MPa pressure and 80°C-100°C temperature for 50min-70min.

[0045] It should be noted that the sugar powder has been removed in S3, leaving only the shaped multi-walled carbon nanotubes and polyetheretherketone skeletons. The mold is then placed on an ultrasonic vibrating screen and modulated in a pulsating working mode of -30Hz. At the same time, wood powder is added to the mold. The wood powder continues to vibrate in the mold under the action of the ultrasonic vibrating screen, and continues to fill the position of the sugar powder in S3. As the ultrasonic vibrating screen continues to work, the gaps left by the sugar powder are completely filled. After that, a hot pressing treatment is carried out at a pressure of 3MPa-5MPa and a temperature of 80℃-100℃ for 50min-70min to compact the wood powder, multi-walled carbon nanotubes and polyetheretherketone skeletons.

[0046] Preferred Embodiments

[0047] A method for preparing a non-adhesive self-bonding lightweight high-strength intelligent stealth structural material, comprising:

[0048] S1: polyetheretherketone is made into polyetheretherketone polymer, and the polyetheretherketone polymer is ejected from a syringe by electrospinning with the parameters of using an electrode of 20KV-25KV, a propulsion speed of 0.2ml / h-0.6ml / h, and an electrode distance of 8cm-12cm, so that it forms a non-woven mesh fiber felt on a receiving device, and then placed in a mold;

[0049] S2: Mix the multi-walled carbon nanotubes and agarose powder, use a hinged stirrer to stir at a speed of 1000 r / min-2000 r / min for 30 min-60 min, and add the stirred mixture into the mold in S1;

[0050] S3: subjecting the mold in S2 to a heat preservation and curing treatment at a temperature of 70°C-80°C, so that the mixture in the mold is cured, then taking out the cured mixture, putting it into water, and heating it at a temperature of 65°C-70°C, and then keeping it warm for 1h-1.5h, taking out the mixture, filtering, washing, and drying it;

[0051] S4: Put the product obtained in S3 into the mold again, add wood powder into the mold and vibrate it, then perform hot pressing operation at a pressure of 3MPa-5MPa and a temperature of 80℃-100℃ for 50min-70min.

[0052] The method for preparing the stealth structural material comprises the following steps: using multi-walled carbon nanotubes as a shaping plate, spraying the electromagnetic shielding material polyetheretherketone by using an electrospinning technology, stretching the polyetheretherketone into a mesh structure, and then adding a mixture of the multi-walled carbon nanotubes and powdered sugar into a mesh polyetheretherketone mold, and then subjecting the mold to a heat preservation and curing treatment, so that the mixture of the multi-walled carbon nanotubes, powdered sugar and polyetheretherketone in the mold is cured. Since the polyetheretherketone has a good electromagnetic shielding effect, and the polyetheretherketone of the present invention is arranged in a mesh structure, it has good air permeability, thereby producing a strong heat dissipation effect. Since the multi-walled carbon nanotubes have good thermal conductivity, the mixture has good electromagnetic shielding performance, thereby achieving a good stealth effect, and the mixture has good heat dissipation performance. After curing, the powdered sugar is removed and replaced with wood powder based on the principle of a low melting point of the powdered sugar, and a hot pressing operation is performed to make the gap between its molecules more compact, thereby increasing the density, making the structure compact, and enhancing the strength.

[0053] When the multi-walled carbon nanotubes and polyetheretherketone are bonded together and mixed into a mixture, the powdered sugar is in a molten state at this time, and the powdered sugar at this time naturally acts as a filler to fill the gaps between the mixture. After that, the curing operation is performed to make the multi-walled carbon nanotubes and polyetheretherketone completely adhere together, and the cured powdered sugar flows through all the gaps of the cured mixture similar to human blood vessels. Finally, the powdered sugar is melted and removed. At this time, gaps appear again. At this time, wood powder between 400 mesh and 500 mesh is used for filling and hot pressing, so that the hot-pressed mixture is more compact, and the mixture is penetrated by the wood powder to fill all the gaps, which increases its fiber feel and makes the wood powder replace the glue for adhesion.

[0054] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A method for preparing a non-adhesive self-bonding lightweight high-strength intelligent stealth structural material, characterized in that: include: S1: preparing polyetheretherketone into polyetheretherketone polymer, ejecting the polyetheretherketone polymer from a syringe by electrospinning to form a non-woven mesh fiber felt on a receiving device, and placing the non-woven mesh fiber felt in a mold; S2: Mix the multi-walled carbon nanotubes and powdered sugar, stir them, and add the stirred mixture into the mold in S1; S3: heat-insulating and curing the mold in S2 to solidify the mixture in the mold, taking out the solidified mixture, putting it into water, heating it, taking out the mixture, filtering, washing and drying it; S4: Put the product obtained in S3 into the mold again, add wood powder into the mold and vibrate it at the same time, and perform hot pressing after the mold is completely filled with wood powder.

2. The method for preparing a non-adhesive self-bonding lightweight high-strength intelligent stealth structural material according to claim 1, characterized in that: The parameters of electrospinning are: using an electrode of 20KV-25KV, a propulsion speed of 0.2ml / h-0.6ml / h, and an electrode distance of 8cm-12cm.

3. The method for preparing a non-adhesive self-bonding lightweight high-strength intelligent stealth structural material according to claim 1, characterized in that: The stirring parameters in S2 are stirring with a folding stirrer, the stirring speed is 1000r / min-2000r / min, and the time is 30min-60min.

4. The method for preparing a non-adhesive self-bonding lightweight high-strength intelligent stealth structural material according to claim 1, characterized in that: The powdered sugar is agarose powder.

5. The method for preparing a non-adhesive self-bonding lightweight high-strength intelligent stealth structural material according to claim 1, characterized in that: The heat preservation and curing treatment in S3 heats the temperature inside the mold to 70° C.-80° C., and then continues the heat preservation treatment.

6. The method for preparing a non-adhesive self-bonding lightweight high-strength intelligent stealth structural material according to claim 1, characterized in that: In the heating treatment in S3, the water is continuously heated to 65° C.-70° C., and then kept warm for 1 h-1.5 h.

7. The method for preparing a non-adhesive self-bonding lightweight high-strength intelligent stealth structural material according to claim 1, characterized in that: In the S2, the ratio of multi-walled carbon nanotubes to powdered sugar is 1:

5.

8. The method for preparing a non-adhesive self-bonding lightweight high-strength intelligent stealth structural material according to claim 1, characterized in that: The vibration operation in S4 is to place the mold on the ultrasonic vibration screen and start the ultrasonic vibration screen while adding wood powder.

9. The method for preparing a non-adhesive self-bonding lightweight high-strength intelligent stealth structural material according to claim 1, characterized in that: The hot pressing operation in S4 has parameters of being carried out at a pressure of 3 MPa-5 MPa and a temperature of 80° C.-100° C. for 50 min-70 min.

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