阅读说明：本技术 一种基于碳纳米管重力油分离效应的低温制冷装置及方法 (Low-temperature refrigerating device and method based on carbon nanotube gravity oil separation effect ) 是由 何一坚 赵恒庆 丁佳敏 于 2021-09-15 设计创作，主要内容包括：本发明公开了一种基于碳纳米管重力油分离效应的低温制冷装置及方法,其中装置基于单机压缩单级分凝自复叠制冷,包括压缩机、冷凝器、气液分离器、毛细管、节流阀；气液分离器中饱和液相高温制冷剂经过节流装置进入冷凝蒸发器完成蒸发过程；同时气液分离器中产生的饱和气体工制冷剂进入冷凝蒸发器完成冷凝过程后经毛细管节流后进入蒸发器,最后蒸发器出来的低温制冷剂与冷凝蒸发器中完成蒸发过程的高温制冷剂气体混合后进入压缩所完成循环；在循环的过程中,向制冷剂添加适量的碳纳米管,使得气液分离器中低沸点制冷剂中的润滑油含量大幅减少,避免润滑油堵塞毛细管,同时可以提升制冷剂的换热性能和提高润滑油的润滑性能、降低压缩机磨损。(The invention discloses a low-temperature refrigerating device and a low-temperature refrigerating method based on a carbon nano tube gravity oil separation effect, wherein the device is based on single-machine compression single-stage condensation separation self-cascade refrigeration and comprises a compressor, a condenser, a gas-liquid separator, a capillary tube and a throttle valve; the saturated liquid-phase high-temperature refrigerant in the gas-liquid separator enters a condensation evaporator through a throttling device to complete the evaporation process; simultaneously, saturated gas working refrigerant generated in the gas-liquid separator enters a condensation evaporator to finish the condensation process, then enters the evaporator after being throttled by a capillary tube, and finally enters the compression to finish the circulation after low-temperature refrigerant coming out of the evaporator is mixed with high-temperature refrigerant gas which finishes the evaporation process in the condensation evaporator; in the circulating process, a proper amount of carbon nano tubes are added into the refrigerant, so that the content of lubricating oil in the low-boiling-point refrigerant in the gas-liquid separator is greatly reduced, the capillary tube is prevented from being blocked by the lubricating oil, the heat exchange performance of the refrigerant can be improved, the lubricating performance of the lubricating oil can be improved, and the abrasion of the compressor can be reduced.)

1. A low-temperature refrigerating device based on a carbon nano tube gravity oil separation effect is characterized by comprising a compressor, a condenser, a gas-liquid separator, a throttle valve, a capillary tube, a condensation evaporator, an evaporator and a filling port; wherein the outlet of the compressor is connected with the inlet of the condenser, and the outlet of the condenser is connected with the inlet of the gas-liquid separator; a high boiling point refrigerant channel of the gas-liquid separator is connected with an evaporation side channel of the condensation evaporator through a throttle valve; a low boiling point refrigerant channel of the gas-liquid separator is connected with a condensing side channel of the condensing evaporator; the outlet of the condensation side of the condensation evaporator is connected with the inlet of the evaporator through a capillary tube; an evaporation side outlet of the condensation evaporator is connected with an outlet of the evaporator and is connected with an inlet of the compressor; a filling port is arranged between the condenser and the gas-liquid separator and is used for filling the carbon nano tube; the lubricating oil is adsorbed by the carbon nano tube, so that the lubricating oil is settled by gravity.

2. The low-temperature refrigeration device based on the carbon nanotube gravity oil separation effect according to claim 1, further comprising a refrigerant, wherein the refrigerant is a self-cascade mixed refrigerant.

3. The low-temperature refrigeration device based on the carbon nanotube gravity oil separation effect according to claim 2, wherein the self-cascade mixed refrigerant comprises one or a combination of high-boiling point refrigerants and one or a combination of low-boiling point refrigerants; wherein the high boiling point refrigerant comprises R134A, R600A, R1234YF, R1234ZE (Z), R1234ZE (E), R142B and R22, and the low boiling point refrigerant comprises R23, R14, R1150, R290, R170, R125 and R32.

4. A low-temperature refrigeration method based on the carbon nanotube gravity oil separation effect, which is characterized in that the refrigeration method is based on the refrigeration device of any one of claims 1 to 3, and comprises the following steps:

step 1: stopping the compressor, and filling a set amount of carbon nanotube material into the refrigerating device through the filling port;

step 2: starting the compressor; mixing the carbon nano tube and the refrigerant and entering a condenser;

and step 3: condensing by a condenser to obtain a partially liquefied refrigerant; the high boiling point refrigerant is in a liquid state after heat release and condensation, and the low boiling point refrigerant keeps in a gaseous state; the lubricating oil has high viscosity, and the carbon nano tubes have a phase-seeing migration mechanism, so the carbon nano tubes adsorb the lubricating oil and deposit to be mixed with the liquid high-boiling-point refrigerant;

and 4, step 4: the partially liquefied refrigerant enters a gas-liquid separator to carry out the separation process of gas-phase low-boiling point refrigerant and high-boiling point refrigerant; the separated high-boiling point refrigerant enters an evaporation side channel of a condensation evaporator through a throttle valve, and the low-temperature refrigerant enters a condensation side channel of the condensation evaporator;

and 5: in a condensation evaporator, a high-boiling-point refrigerant containing lubricating oil and carbon nano tubes exchanges heat with a saturated gas-phase low-boiling-point refrigerant, so that the high-boiling-point refrigerant absorbs heat and evaporates to form steam, and the low-boiling-point refrigerant releases heat and condenses into a liquid state; the high boiling point refrigerant containing the carbon nano tubes generates a large amount of bubbles due to the boiling heat exchange effect, and the carbon nano tubes are resuspended in the refrigerant under the action of the bubbles generated in the boiling process, so that the carbon nano tubes are dispersed, and the phenomenon that the condensation and evaporation effects are poor due to the deposition and agglomeration of the carbon nano tubes in the circulation process is avoided;

step 6: sending the liquid low-boiling point refrigerant into an evaporator through a capillary tube; and mixing the low-boiling-point refrigerant which finishes the evaporation process through the evaporator and the high-boiling-point refrigerant which finishes the condensation evaporator, and then entering a compressor to perform the next cycle process, and ending the step.

5. The method for refrigerating at low temperature based on carbon nanotube gravity oil separation effect according to claim 4, wherein the carbon nanotube material in step 1 is 0.8-10 wt% of the refrigerant.

6. The method for refrigerating at low temperature based on carbon nanotube gravity oil separation effect as claimed in claim 4, wherein the carbon nanotube material is a surface modified carbon nanotube material.

7. The method for refrigerating at low temperature based on the gravity oil separation effect of carbon nanotubes as claimed in claim 6, wherein the surface of the carbon nanotubes is grafted with functional groups with similar alkane chemical properties through covalent bond properties.

8. The method of claim 7, wherein the functional groups with similar alkane chemical properties comprise C₁₆TMS、C₈TMS、C₃TMS。

9. The method for refrigerating at low temperature based on the gravity oil separation effect of the carbon nano tube as claimed in claim 8, wherein the surface modification of the carbon nano tube comprises the following steps:

step 11: uniformly mixing 10-30g of carbon nanotubes with 600ml of alcohol solution, and carrying out water bath ultrasonic treatment for 60-80 minutes to form hydroxyl on the surfaces of the particles;

step 12: adding 5-15g of C into the carbon nano tube/water suspension₁₆TMS、C₈TMS or C₃Forming a covalent bond by TMS to complete the grafting of hydroxyl;

step 13: centrifuging the suspension, and washing the modified particles with alcohol for a set number of times;

step 14: the obtained granules were dried in a vacuum oven to remove the organic solvent.

10. The method for refrigerating at low temperature based on the gravity oil separation effect of the carbon nanotube as claimed in claim 9, wherein the drying temperature of the vacuum oven in the step 14 is 100 ℃ to 120 ℃.

Technical Field

The invention relates to the field of refrigeration equipment, in particular to a low-temperature refrigeration device and method based on a carbon nano tube gravity oil separation effect.

Background

Since the carbon nano tube is discovered in 1991, the carbon nano tube has good heat transfer performance, exceptional electrical conductivity and excellent mechanical property due to unique structural characteristics, thereby arousing wide attention of experts and having wide application prospect in various fields. The carbon nano tube not only has some common characteristics of nano materials, but also has extremely high mechanical strength, is applied to a lubricating oil additive in the lubricating field, and plays a role in improving and enhancing the wear-reducing and wear-resisting properties. The porous structure, the large specific surface area and the light mass density of the carbon nanotube also enable the carbon nanotube to show good performance in adsorption.

In the self-cascade refrigeration system, after refrigerants with different evaporation temperatures are condensed by a condenser, a low-temperature refrigerant is in a gas state, a high-boiling-point refrigerant is condensed into a liquid state, the two states of refrigerants are separated by arranging a gas-liquid separator, and the liquid high-boiling-point refrigerant is throttled and then continues to be condensed. However, at present, the gas-phase low-boiling point refrigerant often entrains some lubricant oil droplets during separation, and the lubricant oil droplets seriously enter a low-temperature pipeline, so that capillary tube blockage is caused, and the operation condition of a system is seriously influenced.

At present, in order to realize the efficient separation of gas-phase low-boiling point refrigerant and lubricating oil in a gas-liquid separator of a low-temperature refrigeration system, the gas-liquid separator is mainly improved, but the separation effect of the process on emulsified oil which is mutually soluble with the refrigerant is still not obvious, so that a device and a method capable of efficiently separating oil components in the gas-phase low-boiling point refrigerant are needed.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a low-temperature refrigerating device and method based on a carbon nano tube gravity oil separation effect.

In order to solve the problems, the invention adopts the following technical scheme:

a low-temperature refrigerating device based on a carbon nano tube gravity oil separation effect comprises a compressor, a condenser, a gas-liquid separator, a throttle valve, a capillary tube, a condensation evaporator, an evaporator and a filling opening; wherein the outlet of the compressor is connected with the inlet of the condenser, and the outlet of the condenser is connected with the inlet of the gas-liquid separator; a high boiling point refrigerant channel of the gas-liquid separator is connected with an evaporation side channel of the condensation evaporator through a throttle valve; a low boiling point refrigerant channel of the gas-liquid separator is connected with a condensing side channel of the condensing evaporator; the outlet of the condensation side of the condensation evaporator is connected with the inlet of the evaporator through a capillary tube; an evaporation side outlet of the condensation evaporator is connected with an outlet of the evaporator and is connected with an inlet of the compressor; and a filling port is arranged between the condenser and the gas-liquid separator and is used for filling the carbon nano tubes.

Further, the refrigerant also comprises a refrigerant, and the refrigerant adopts a self-cascade mixed refrigerant.

Further, the self-cascade mixed refrigerant comprises one or the combination of high-boiling point refrigerants and one or the combination of low-boiling point refrigerants; wherein the high boiling point refrigerant comprises R134A, R600A, R1234YF, R1234ZE (Z), R1234ZE (E), R142B and R22, and the low boiling point refrigerant comprises R23, R14, R1150, R290, R170, R125 and R32.

A low-temperature refrigeration method based on a carbon nano tube gravity oil separation effect is based on the refrigeration device and comprises the following steps:

step 1: stopping the compressor, and filling a set amount of carbon nanotube material into the refrigerating device through the filling port;

step 2: starting the compressor; mixing the carbon nano tube and the refrigerant and entering a condenser;

and step 3: condensing by a condenser to obtain a partially liquefied refrigerant; the high boiling point refrigerant is in a liquid state after heat release and condensation, and the low boiling point refrigerant keeps in a gaseous state; the lubricating oil has high viscosity, and the carbon nano tubes have a phase-seeing migration mechanism, so the carbon nano tubes adsorb the lubricating oil and deposit to be mixed with the liquid high-boiling-point refrigerant;

and 4, step 4: the partially liquefied refrigerant enters a gas-liquid separator to carry out the separation process of gas-phase low-boiling point refrigerant and high-boiling point refrigerant; the separated high-boiling point refrigerant enters an evaporation side channel of a condensation evaporator through a throttle valve, and the low-temperature refrigerant enters a condensation side channel of the condensation evaporator;

and 5: in a condensation evaporator, a high-boiling-point refrigerant containing lubricating oil and carbon nano tubes exchanges heat with a saturated gas-phase low-boiling-point refrigerant, so that the high-boiling-point refrigerant absorbs heat and evaporates to form steam, and the low-boiling-point refrigerant releases heat and condenses into a liquid state; the high boiling point refrigerant containing the carbon nano tubes generates a large amount of bubbles due to the boiling heat exchange effect, and the carbon nano tubes are resuspended in the refrigerant under the action of the bubbles generated in the boiling process, so that the carbon nano tubes are dispersed, and the phenomenon that the condensation and evaporation effects are poor due to the deposition and agglomeration of the carbon nano tubes in the circulation process is avoided;

step 6: sending the liquid low-boiling point refrigerant into an evaporator through a capillary tube; and mixing the low-boiling-point refrigerant which finishes the evaporation process through the evaporator and the high-boiling-point refrigerant which finishes the condensation evaporator, and then entering a compressor to perform the next cycle process, and ending the step.

Further, the carbon nanotube material in the step 1 is 0.8-10 wt% of the refrigerant.

Further, the carbon nanotube material is a surface-modified carbon nanotube material.

Further, the surface of the carbon nano tube is grafted with a functional group with similar alkane chemical properties through the property of covalent bonds.

Further, functional groups of similar alkane chemistry include C₁₆TMS、C₈TMS、C₃TMS。

Further, the surface modification of the carbon nanotube comprises the following steps:

step 11: selecting 10-30g of carbon nano tube and 600ml of alcohol solution, uniformly mixing, and carrying out water bath ultrasonic treatment for 60-80 minutes to form hydroxyl on the surface of the particles;

step 12: adding carbon nanotube/water suspension5 to 15g of C₁₆TMS、C₈TMS or C₃Forming a covalent bond by TMS to complete the grafting of hydroxyl;

step 13: centrifuging the suspension, and washing the modified particles with alcohol for a set number of times;

step 14: the obtained granules were dried in a vacuum oven to remove the organic solvent.

Further, the drying temperature of the vacuum oven in the step 14 is 100 ℃ to 120 ℃.

The invention has the beneficial effects that:

by arranging the filling carbon nanotube material between the condenser and the gas-liquid separator, the characteristics of the carbon nanotube material, such as porous structure, larger specific surface area and the like, are utilized to realize the adsorption of the mist-shaped lubricating oil drops carried by the gas-phase low-boiling-point refrigerant in the gas-liquid separator in the self-cascade refrigeration system, the density of the lubricating oil is increased, the lubricating oil is promoted to be settled by gravity in the gas-liquid separator and the condensation evaporator, the content of the lubricating oil in the low-boiling-point refrigerant is reduced, and the lubricating oil is prevented from entering the capillary tube along with the low-boiling-point refrigerant to cause blockage;

by adding the carbon nano tubes, the carbon nano tubes circulate in the refrigerating device along with the refrigerant, and after entering the compressor, the carbon nano tubes play a role in lubricating the compressor, so that the mechanical loss of the compressor is reduced, the use amount of lubricating oil in the compressor is reduced, and the reduction of oil foam in the gas-phase low-boiling-point refrigerant is further promoted;

the heat exchange efficiency and the refrigerating capacity of the refrigerating device are improved by adding the carbon nano tubes;

in the process of filling the carbon nano tube in the step 1, stopping the work of the compressor, so as to facilitate the filling of the carbon nano tube;

by modifying the surface of the carbon nano tube, the affinity of the carbon nano tube and the lubricating oil containing mineral oil is improved, the purpose of adsorbing the lubricating oil is better realized, the agglomeration of carbon nano tube particles in the lubricating oil is reduced, the deposition proportion of the particles is reduced, and the purpose of improving oil phase migration is achieved.

Drawings

Fig. 1 is a block diagram of a first embodiment of the present invention.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

The first embodiment is as follows:

as shown in fig. 1, a low-temperature refrigeration device based on the gravity oil separation effect of carbon nanotubes comprises a compressor, a condenser, a gas-liquid separator, a throttle valve, a capillary tube, a condensing evaporator, an evaporator and a filling port; wherein the outlet of the compressor is connected with the inlet of the condenser, and the outlet of the condenser is connected with the inlet of the gas-liquid separator; a high boiling point refrigerant channel of the gas-liquid separator is connected with an evaporation side channel of the condensation evaporator through a throttle valve; a low boiling point refrigerant channel of the gas-liquid separator is connected with a condensing side channel of the condensing evaporator; the outlet of the condensation side of the condensation evaporator is connected with the inlet of the evaporator through a capillary tube; an evaporation side outlet of the condensation evaporator is connected with an outlet of the evaporator and is connected with an inlet of the compressor; a filling port is arranged between the condenser and the gas-liquid separator, and is used for filling the carbon nanotubes, and it should be noted that in some other embodiments, the filling port may also be arranged directly on the condenser or between other devices. The refrigerant in the refrigerating device is an existing self-cascade mixed refrigerant, the self-cascade mixed refrigerant comprises one or a combination of high boiling point refrigerants and one or a combination of low boiling point refrigerants, wherein the high boiling point refrigerants comprise R134A, R600A, R1234YF, R1234ZE (Z), R1234ZE (E), R142B, R22 and the like, and the low boiling point refrigerants comprise R23, R14, R1150, R290, R170, R125, R32 and the like. Binary mixed refrigerant type self-cascade mixed refrigerant comprises R134A and R23 in 60: 40, R134A/R744 at 65:35, R600A/R744 at 65:35, and R170/R600A at 8: 92, carrying out proportioning combination; the ternary mixed working medium comprises R290, R600A and R123, wherein the ratio of R123 to R600 is 50: 10: 40, R23, R143A and R134A in a ratio of 10: 70: 20, proportioning and combining; the quaternary mixed working medium comprises R23, R125, R134A and R32, and the ratio of (10): 45: 40: 5, carrying out combination of proportioning. In the present embodiment, the refrigerant mixed by R744 and R134A is adopted, and the ratio is 35: 65.

the filling port is used for filling carbon nanotube materials, and absorbing mist-shaped oil drops in the gas-phase low-boiling-point refrigerant separated by the gas-liquid separator through the carbon nanotube materials. The carbon nanotubes circulate in the refrigeration apparatus following the refrigerant.

In the implementation process, a filling opening for filling a carbon nanotube material is arranged between the condenser and the gas-liquid separator, and by utilizing the characteristics of the porous structure, the larger specific surface area and the like of the carbon nanotube material, the adsorption of mist-shaped lubricating oil drops carried by a gas-phase low-boiling-point refrigerant in the gas-liquid separator in the self-cascade refrigeration system is realized, the density of the lubricating oil is increased, the lubricating oil is promoted to be settled by gravity in the gas-liquid separator and the condensation evaporator, and the lubricating oil is prevented from entering the capillary tube along with the low-boiling-point refrigerant to cause blockage; by adding the carbon nano tubes, the carbon nano tubes circulate in the refrigerating device along with the refrigerant, and after entering the compressor, the carbon nano tubes play a role in lubricating the compressor, so that the mechanical loss of the compressor is reduced, the use amount of lubricating oil in the compressor is reduced, and the reduction of oil foam in the low-boiling-point refrigerant is further promoted; the heat exchange efficiency and the refrigerating capacity of the refrigerating device are improved by adding the carbon nano tubes.

A low-temperature refrigeration method based on a carbon nano tube gravity oil separation effect comprises the following steps:

step 1: stopping the compressor, and filling a set amount of carbon nanotube material into the refrigerating device through the filling port;

step 2: starting the compressor; mixing the carbon nano tube and the refrigerant and entering a condenser;

and step 3: condensing by a condenser to obtain a partially liquefied refrigerant; the high boiling point refrigerant releases heat to form a liquid state and the low boiling point refrigerant keeps a gaseous state through the condensation effect of the condenser;

and 4, step 4: the partially liquefied refrigerant enters a gas-liquid separator to carry out the separation process of gas-phase low-boiling point refrigerant and high-boiling point refrigerant; the separated high-boiling point refrigerant enters an evaporation side channel of a condensation evaporator through a throttle valve, and the low-temperature refrigerant enters a condensation side channel of the condensation evaporator;

and 5: in a condensation evaporator, a high-boiling-point refrigerant containing lubricating oil and carbon nano tubes exchanges heat with a saturated gas-phase low-boiling-point refrigerant, so that the high-boiling-point refrigerant absorbs heat and evaporates to form steam, and the low-boiling-point refrigerant releases heat and condenses into a liquid state;

step 6: sending the liquid low-boiling point refrigerant into an evaporator through a capillary tube; mixing the low boiling point refrigerant which finishes the evaporation process by the evaporator and the high boiling point refrigerant which finishes the evaporation process by the condensation evaporator, and then entering a compressor for the next cycle process, and ending the step; wherein the high boiling point refrigerant contains lubricating oil and carbon nano tubes.

The carbon nanotube material in the set amount in the step 1 is 0.8-10 wt% of the refrigerant. In this example, the carbon nanotube material is a surface-modified carbon nanotube material; grafting functional group with similar alkane chemical property to the surface of carbon nanotube via covalent bond property, including C₁₆TMS、C₈TMS、C₃TMS, the modification of the carbon nano tube is realized. The affinity of the carbon nano tube material with the lubricating oil containing mineral oil is improved through the surface modified carbon nano tube material, the purpose of adsorbing the lubricating oil is better realized, the agglomeration of carbon nano tube particles in the lubricating oil is reduced, and the particle aggregation is reducedThe deposition proportion is increased, thereby achieving the purpose of improving the migration of the oil phase. The surface modification of the carbon nanotubes is obtained by the following steps, in C₁₆TMS is taken as an example:

step 11: uniformly mixing 20g of carbon nanotubes with 600ml of alcohol solution, and carrying out water bath ultrasonic treatment for 60-80 minutes to form hydroxyl on the surfaces of the particles;

step 12: adding 10g of C to the carbon nanotube/water suspension₁₆Forming a covalent bond by TMS to complete the grafting of hydroxyl;

step 13: centrifuging the suspension and washing the modified particles several times with alcohol;

step 14: the resulting granules were dried in a vacuum oven for 3 hours to remove the organic solvent.

The drying temperature of the vacuum oven in the step 14 is 100-120 ℃, and preferably 110 ℃.

In the step 3, the lubricating oil has high viscosity, and the carbon nanotubes have a phase-seeing migration mechanism, so the carbon nanotubes are more easily combined with the lubricating oil than the refrigerant, and after the lubricating oil is adsorbed, the carbon nanotubes and the lubricating oil are more present in the liquid high-boiling-point refrigerant due to deposition caused by weight increase;

in the step 5, the high-boiling-point refrigerant containing the carbon nano tubes generates a large amount of bubbles due to the boiling heat exchange effect, and the carbon nano tubes are resuspended in the refrigerant under the action of the bubbles generated in the boiling process, so that the carbon nano tubes are dispersed, the phenomenon that the condensation and evaporation effects are deteriorated due to the deposition and agglomeration of the carbon nano tubes in the circulation process is avoided, and the long-time high-efficiency operation of the device is facilitated.

In the implementation process, the compressor stops working in the process of filling the carbon nano tube in the step 1, so that the carbon nano tube can be conveniently filled; by modifying the surface of the carbon nano tube, the affinity of the carbon nano tube and the lubricating oil containing mineral oil is improved, the purpose of adsorbing the lubricating oil is better realized, the agglomeration of carbon nano tube particles in the lubricating oil is reduced, the deposition proportion of the particles is reduced, and the purpose of improving oil phase migration is achieved.

Example two:

this example was obtained by modifying the first example, wherein the process of modifying carbon nanotubes comprises the following steps:

step 21: adding methyl methacrylate into a three-necked bottle containing methanol and carbon nano tubes; wherein the mass ratio of the methyl methacrylate to the carbon nano tube is 20: 1, the ratio of the methyl methacrylate to the methanol is 1g/20 ml-1 g/40 ml;

step 22: carrying out ultrasonic treatment on the three-necked bottle for 10-30 min;

step 23: continuously introducing nitrogen into the three-necked flask for 25-35 min

Step 24: adding 1g of free radical initiator into a three-necked bottle, and reacting for 6-10h at the temperature of 55-70 ℃; in the embodiment, the free radical initiator adopts azobisisobutyronitrile, and the carbon nano tube and the methyl methacrylate can be promoted to form a covalent bond by the free radical initiator, so that the reaction is ensured to be more thorough;

step 25: obtaining a product after reaction through filtration, and carrying out ultrasonic washing for 3-5 times through ethyl acetate;

step 26: and (3) putting the washed particles into a vacuum oven, setting the temperature to be 40-50 ℃, drying for 16-20 h, and removing the organic solvent.

The above description is only one specific example of the present invention and should not be construed as limiting the invention in any way. It will be apparent to persons skilled in the relevant art(s) that, having the benefit of this disclosure and its principles, various modifications and changes in form and detail can be made without departing from the principles and structures of the invention, which are, however, encompassed by the appended claims.