CN110105711B - Method for improving tribological performance of epoxy resin - Google Patents
Method for improving tribological performance of epoxy resin Download PDFInfo
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- CN110105711B CN110105711B CN201910434331.9A CN201910434331A CN110105711B CN 110105711 B CN110105711 B CN 110105711B CN 201910434331 A CN201910434331 A CN 201910434331A CN 110105711 B CN110105711 B CN 110105711B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention provides a method for improving tribological performance of epoxy resin, belonging to the technical field of macroscopic lubrication. Mixing Ti3C2Uniform Ti prepared from MXene nano-sheet and nano-cellulose3C2Cooling MXene/cellulose solution in single direction, freezing the solution completely to ice, and freeze drying at-40 deg.C to-60 deg.C under 2-10Pa for 3-5 days to obtain Ti3C2The three-dimensional network structure block of MXene nanometer sheet. Adding epoxy resin, degassing at 35-60 deg.C under vacuum for 6-48h to make epoxy resin fully soak in three-dimensional structure, and making the structure be frame to obtain epoxy resin composite material. Under the condition of dry friction, the thermal conductivity of the modified composite material is improved by 41.2% compared with that of pure epoxy resin, the friction coefficient, the wear rate and the wear volume are reduced by 87%, 45% and 45% compared with that of the pure epoxy resin, and the tribology and thermal properties of the epoxy resin are improved.
Description
Technical Field
The invention provides a method for improving tribological performance of epoxy resin, belonging to the technical field of macroscopic lubrication.
Background
Friction is seen everywhere, whether in the engineering or living areas. It is reported that the loss caused by friction and wear accounts for 2-7% of the total value of national production, nearly 1/3% of fuel in automobiles is consumed to overcome friction, and the generation of wear greatly reduces the service life of mechanical parts. In modern industry, friction and wear are always difficult to solve, and the traditional solution is to use a lubricating material in a gas, liquid, semi-solid or solid form to reduce friction, reduce friction loss of parts and useless work caused by friction in the production process. However, as the level of technology and design and manufacturing increases, the operating environment conditions for the equipment become more severe and demanding. For example, with the development of aerospace and deep sea exploration industries, some mechanical devices need to be used under conditions of high vacuum, high pressure, high and low temperature, radiation and the like. At this time, the conventional solution is no longer applicable, and cannot meet the requirements of the current industrial development on equipment use, and a lubrication method capable of being used under the extremely severe conditions is urgently needed. Under such a situation, polymer composite materials attract more and more attention and researches due to the characteristics of light weight, wear resistance, self-lubrication, corrosion resistance and the like, are gradually applied to machinery and equipment, and replace some traditional metal materials. The friction problem of machinery equipment under extremely abominable operating mode has not only been opened up a way for solving this, simultaneously, has lightened equipment weight and has reduced the energy consumption, has alleviated the overuse problem of traditional metal material, has brought new power for modern science and technology development and industrial production progress.
As one of excellent engineering polymers, the epoxy resin has the characteristics of good mechanical property, excellent bonding property, easy curing and forming and the like, is an important engineering polymer material, and is widely applied to the fields of aerospace, machining, military equipment and the like as grinding wheel adhesives, engineering plastics, electronic and electrical materials and the like. With the improvement of industrial development and manufacturing level, the working conditions of instruments and equipment are more rigorous, the performance requirements on mechanical devices are increasingly improved, and the traditional epoxy resin and the composite material thereof cannot meet the requirements of high-performance equipment, high-performance parts and high-performance processing because of the defects of poor thermal performance, poor friction performance and the like. Therefore, the method has scientific significance and application value for maintaining other good properties and improving the heat conducting property, the high temperature resistance and the tribological property of the material.
Currently, in the field of tribology, it is common to utilize one or more organic or inorganic fillers as a lubricating material to improve the frictional wear and mechanical properties of epoxy resins and composites thereof. With the discovery of graphene, more and more two-dimensional nano materials are applied to modified composite materials, and the tribological performance research of the modified composite materials is improved. Like graphene, boron nitride and molybdenum disulfide, Ti3C2MXene is a novel two-dimensional material with excellent electrical and thermal properties, excellent mechanical properties, high specific surface area and layer-by-layer stacking structureThe structure is bonded by weak van der Waals force, and can be peeled and delaminated by self under the action of small shearing force to form a thin sheet layer with good stability. During the friction process, the sheets and the abrasive dust are easy to form a lubricating film, the friction coefficient between friction pairs is reduced, and the abrasion of a friction piece is reduced, so that the self-lubricating material is an ideal self-lubricating material. Further, Ti3C2MXene also has some chemical groups on its surface, such as-OH, -O, -F, due to the chemical etching process, which are beneficial to make it well dispersed in the polymer matrix under the condition of low addition content, therefore, Ti3C2MXene has great potential application value in modifying polymer and improving tribological performance.
Disclosure of Invention
The invention provides a method for improving tribological performance of epoxy resin, belonging to the technical field of macroscopic lubrication.
The technical scheme of the invention is as follows:
mixing 5-20 wt% of Ti3C2MXene nanosheet and 1 wt% of nanocellulose to prepare uniform Ti3C2Cooling MXene/cellulose solution in one direction at-40 deg.C to-196 deg.C, completely freezing the solution to ice, and freeze drying at-40 deg.C to-60 deg.C and 2-10Pa for 3-5 days to obtain Ti3C2The three-dimensional network structure block of MXene nanometer sheet. Adding 79-94 wt% of epoxy resin, degassing for 6-48h at 35-60 ℃ under vacuum condition, fully immersing the epoxy resin into a three-dimensional structure, and preparing the epoxy resin composite material by taking the structure as a frame. Ti used3C2The MXene nano-sheet has transverse dimension of 0.5-2.4 μm, average dimension of 1-1.2 μm, and thickness of 2-20 nm. Under the condition of dry friction, the thermal conductivity of the modified composite material is improved by 41.2% compared with that of pure epoxy resin, and the friction coefficient, the wear rate and the wear volume are reduced by 87%, 45% and 45% compared with that of the pure epoxy resin. The invention achieves the improvement of tribological and thermal properties of epoxy resins.
A method for improving tribological performance of epoxy resin comprises the following steps:
forming two-dimensional material by single-direction cooling and freeze dryingMaterial Ti3C2The epoxy resin composite material is prepared by taking the three-dimensional network structure of MXene nanosheets and cellulose as a framework, and the tribological and thermal properties of the epoxy resin are improved, and the method comprises the following steps:
1) mixing 5-20 wt% of Ti3C2MXene nanosheet and 1 wt% of nanocellulose are added into water to form Ti3C2MXene/cellulose aqueous solution, stirring at 50-130rpm for 1-10h under ice bath condition to obtain uniformly dispersed Ti3C2MXene/cellulose in water.
The Ti3C2The MXene nano-sheet has transverse dimension of 0.5-2.4 μm, average dimension of 1-1.2 μm, and thickness of 2-20 nm. Ti3C2The ratio of the mass of the cellulose to the mass of the added water in the MXene/cellulose solution is 1:100, and the ratio is such that the adjacent Ti in the finally formed three-dimensional structure3C2The distance between the MXene nanosheet wall layers is 20-30 μm, the size is favorable for epoxy resin to be immersed into a three-dimensional network structure block, so that the composite material is more compact, and the prepared epoxy composite material is easy to form flaky abrasive dust under the action of alternating stress, and plays a role in resisting wear and reducing friction. Non-exfoliated Ti3C2MXene is composed of MAX phase (Ti)3AlC2) And removing the Al atomic layer by selective etching with hydrofluoric acid to obtain the blocky particles with the 'accordion' appearance. The use of massive particles to build up a three-dimensional network structure can result in structural collapse. Therefore, Ti for three-dimensional network structure3C2MXene nano-sheet is prepared by high-pressure method and is prepared from bulk Ti with accordion shape3C2MXene exfoliation to form Ti3C2MXene nano-sheet with transverse dimension of 0.5-2.4 μm, average dimension of 1-1.2 μm, and thickness of 2-20 nm. In addition, the nanocellulose used in the experiment was surface-modified, the surface thereof had-COOH, -OH groups, Ti prepared by hydrofluoric acid etching3C2MXene has-OH, -O and-F groups on the surface and is beneficial to Ti3C2The MXene nano-sheets are distributed and combined on the surface of the nano-cellulose.
2) Will obtainTi of (A)3C2MXene/cellulose solution was placed in a container. The container is wrapped with heat insulation cotton. Subsequently, the bottom of the container is cooled and set at-40 ℃ to-196 ℃ for directional freezing.
In the preparation of Ti3C2When the MXene nanosheets are in a three-dimensional network structure block, the MXene nanosheets are cooled in a single direction, the ice crystal growth direction of the aqueous solution is along the temperature gradient direction, and in the process, cellulose and Ti in the aqueous solution3C2The MXene nano-sheets can be directionally arranged along with the growth direction of the ice crystals; in the freeze-drying process, the ice crystals are sublimated, and Ti with certain directionality is obtained3C2The three-dimensional network structure of the MXene nanosheets is preserved, wherein the nanocellulose increases the strength of the structure, making it less prone to collapse. In order to make the temperature gradient more obvious in the directional freezing process, Ti3C2MXene nano-sheet and cellulose are arranged more orderly in three-dimensional network structure, and adjacent Ti3C2The distance between MXene nanosheet wall layers is more suitable, and the cooling temperature is set to be-80 ℃ to-196 ℃.
3) Freezing the solution into ice, placing into a vacuum freeze drier, and freeze drying at-40 deg.C to-60 deg.C under 2-10Pa for 3-5 days to obtain Ti3C2The three-dimensional network structure block of MXene nanometer sheet.
The freeze drying process is a process of directly pumping water out in the form of solid ice, and is essentially a sublimation process, and the drying mode can be used for directionally freezing the formed highly oriented Ti in the process of directional freezing because the drying mode does not pass through the phase state of liquid water3C2The MXene nano-sheet and cellulose three-dimensional network structure is completely maintained, and meanwhile, the surface tension change in microscopic pores can not occur, and the size change and the structural discontinuity can not occur. In the process, the sublimation rate is influenced by the temperature and the vacuum degree, and the probability of causing defects, such as local structural collapse, deformation and the like, is increased due to the excessively high rate; too slow a rate can affect economic costs. Thus, in this process, the temperature was adjusted to-40 ℃ to-60 ℃ and 2-10Pa, and the mixture was freeze-dried for 3-5 days.
4) Will be prepared intoPrepared Ti3C2Putting the three-dimensional network structure block of the MXene nano-sheets into a container prepared from aluminum foil paper, adding 79-94 wt% of epoxy resin, and degassing for 6-48h at 35-60 ℃ under a vacuum condition to ensure that the epoxy resin is fully immersed in the three-dimensional structure block.
In the process of fully immersing the epoxy resin into the three-dimensional structure block, because the gap of the three-dimensional structure is micron-sized, and at room temperature, the epoxy resin has certain viscosity, the immersion effect is poor, and the time consumption is more, so the epoxy resin is degassed at 35-60 ℃ under the vacuum condition, the viscosity of the epoxy resin is reduced, the fluidity is increased, the epoxy resin is more fully immersed into the three-dimensional structure, and the prepared composite material is more compact. In addition, depending on the size of the three-dimensional structure, the degassing time is varied, and it is generally preferred to select 6 to 48 hours.
5) The epoxy cures to shape the sample. And cooling the cured sample to ambient temperature, polishing the composite material by using sand paper, and removing redundant epoxy resin on the edge to obtain the composite material with a three-dimensional structure. Having Ti3C2The thermal conductivity of the epoxy composite material with the MXene nanosheet three-dimensional network structure is 0.24-0.27W/mK; the thermal conductivity of the epoxy resin is 0.15-0.17W/mK; the thermal conductivity of the modified composite material is improved by 41.2 percent compared with that of pure epoxy resin. The freeze-drying method is utilized to prepare the epoxy composite material with the three-dimensional network structure, wherein Ti is used as a high-heat-conducting phase3C2MXene nano-sheets are directionally arranged by depending on a nano-cellulose framework along with the growth direction of ice crystals under the directional freezing condition. By utilizing the in-plane outstanding performance of the two-dimensional nano material, along with the increase of the content of the filler, continuous high heat conduction paths can be formed more in the longitudinal direction, so that the heat conductivity of the composite material is improved. Nanocellulose and Ti3C2The surface group of the MXene filler is favorable for forming good interface compatibility with an epoxy body, so that the interface thermal resistance is reduced, and the thermal conductivity is improved. Thus, Ti3C2The MXene nanosheet three-dimensional structure is constructed, so that the thermal performance of the epoxy resin is improved, and the frictional wear performance of the composite material is improved.
6) The measuring equipment is a ball disc type multifunctional high-temperature friction and wear testing machine, and the frictional mating part is a GCr15 steel ball. Before the test, the friction surfaces of the epoxy resin and the epoxy composite material are polished to be smooth, the roughness is Ra of 0.18-0.20 mu m, and the friction pair is ultrasonically cleaned for 10-30min by alcohol. At room temperature, the relative humidity is 60%, under the dry friction condition, the applied load is 10N, the swing is 5mm, and the frequency is 2 Hz. After 3600s, has Ti3C2The friction coefficient of the epoxy composite material with the MXene nanosheet three-dimensional network structure is 0.06-0.07, and the wear rate is 13.2 multiplied by 10-5-15.6×10-5mm3mN, abrasion volume 4765.2X 10-5-5615.4×10-5mm3(ii) a The friction coefficient of the epoxy resin is 0.54-0.56, and the wear rate is 28.5 multiplied by 10-5-29.1×10-5mm3mN, abrasion volume 10276.6X 10-5-10491.4×10-5mm3(ii) a The friction coefficient, the wear rate and the wear volume of the modified composite material are reduced by 87 percent, 45 percent and 45 percent compared with those of pure epoxy resin.
In the epoxy resin curing process, a linear molecular chain reacts with a curing agent to form a three-dimensional network cross-linked structure, the texture is hard and brittle, under the condition of alternating stress, a maximum shear force distribution point exists below the surface, cracks are most easily formed at the position, and the cracks expand along with the reciprocating of the friction process. In addition, in the friction and wear process, a large amount of heat is generated by the relative movement of a friction pair, the traditional epoxy resin has poor heat conduction performance, the heat is gathered to cause the defects of polymer materials, the retaining force of the polymer is insufficient, the plastic deformation is generated, and even the physical state change (the glass state is changed into the high elastic state or the viscous state) is generated, so the friction and wear performance deterioration is aggravated, and the friction coefficient and the wear rate of the epoxy resin are high.
Ti3C2MXene is a novel two-dimensional ceramic material with the characteristics of high thermal conductivity, excellent mechanical strength, shearing property of a layer-by-layer stacking structure, high hardness and the likeThe point, layer-by-layer stacking structure is bonded by weak van der waals force, and can be peeled and layered by self under the action of small shearing force to form a thin sheet layer with good stability. The modified polymer material is added in a proper amount, so that the hardness of the composite material can be improved, the sheets and the abrasive dust are easy to form a lubricating film in the friction process, the friction coefficient between friction pairs is reduced, and the abrasion of a friction piece is slowed down.
Adding Ti into an epoxy composite material with a three-dimensional network structure3C2MXene nano-sheet, though the interface bonding of filler and matrix is good, still not as strong as the bonding strength formed by the self-curing reaction of epoxy matrix, directional distributed Ti3C2MXene wall layer exists in epoxy matrix as 'weak layer', and Ti is under the action of alternating stress in the friction process3C2Cracks parallel to the wall layer are easily formed on the wall layer of the MXene nanosheet, the cracks are expanded along the wall layer direction along with the friction process to form large flaky abrasive dust for layering, the layered abrasive dust exists between the dual surfaces of the friction pair, part of the layered abrasive dust is compacted, part of the layered abrasive dust slides to isolate the direct contact of the two, namely the sliding friction effect, and the friction coefficient and the wear rate are reduced to a large extent. Further, Ti3C2MXene layers are weak van der Waals force and are subjected to shearing force, Ti during the friction process3C2MXene is cut to form a thin sheet layer, so that the shearing strength is low in the friction process, and a certain friction reducing effect is achieved. However, when Ti is used3C2When the MXene nano-sheets are less, Ti corresponding to the composite material is found3C2Ti on the surface of nano-cellulose in MXene three-dimensional structure network3C2Little MXene, no obvious effect on guiding the directional propagation of cracks, relatively small hardness and large deformation, so that the wear rate and the wear volume are large under the condition and even exceed those of pure epoxy resin. When Ti is present3C2Excessive MXene filler, Ti3C2MXene is prone to agglomeration, which results in poor interfacial bonding with the epoxy matrix, poor thermal performance and a dramatic increase in wear rate. Thus, it is possible to provideAdded of Ti3C2The mass fraction of MXene nano-sheet is preferably 5-20%.
Ultrasonically cleaning the friction pair with alcohol for 10-30 min. Because the alcohol has strong decontamination capability and is volatile, the alcohol is convenient to dry after being cleaned. Therefore, alcohol is selected as the cleaning agent. The ultrasonic cleaning time is too short, and the pollution is difficult to clean; the time is too long, and the pollution is easy to pollute the cleaning surface, so that 10-30min is preferably selected.
The measuring equipment is a ball disc type multifunctional high-temperature friction and wear testing machine, the applied load is 10N, the swing amplitude is 5mm, and the swing frequency is 2 Hz. A ball disc type multifunctional high-temperature friction wear testing machine is divided into an upper sample table and a lower sample table, wherein the upper sample table is used for fixing a friction steel ball and is provided with a displacement sensor and a 6-axis sensor, and the three axial force and moment changes can be originally detected at the same time; the lower sample stage is used for fixedly placing a sample and is provided with a capacitance sensor, the movement is accurate, the horizontal movement range is 5mm, and the lower sample stage belongs to the macroscopic range; the tester obtains force response through the sensor, and the friction coefficient is measured by self software.
After the rubbing process was completed, the scratch was measured using a laser confocal microscope (Zeiss), and the cross-sectional area (S, mm) of the scratch was measured by an integration method2) And multiplied by the scratch length to give the scratch volume. Each scratch was measured at 3 different locations and the average was finally taken as the final experimental data. The wear rate is the change in wear volume per unit length per unit load. The wear rate is calculated by equation (1):
W＝V/(F×L) (1)
in the formula, W (mm)3mN) is the wear rate, V (mm)3) For scratch volume, F (N) is applied load at rubbing, and L (m) is rubbing distance.
The invention has the advantages that: constructing two-dimensional material Ti by single-direction cold orientation and freeze drying method3C2The MXene nanosheet and the cellulose three-dimensional network structure are used as a framework to prepare the epoxy resin composite material, so that the tribological performance and the thermal performance of the epoxy resin are improved.
Drawings
FIG. 1 is a scanning electron micrograph of epoxy scratches under a 10N load and 2Hz dry friction condition.
FIG. 2 shows Ti with 5.5% by weight added under the condition of dry friction at a frequency of 2Hz and a load of 10N3C2And (3) a scratch scanning electron microscope image of the epoxy composite material with the three-dimensional network structure of the MXene nanosheet.
FIG. 3 shows epoxy resin and 5.5% Ti under a load of 10N and a frequency of 2Hz dry friction3C2The friction coefficient curve graph of the epoxy composite material with the three-dimensional network structure of the MXene nanosheet.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings.
Example 1:
20g of epoxy resin was taken and pre-cured in an oven at 135 ℃ for 2h and post-cured at 165 ℃ for 14h to achieve sample cure. After cooling the cured sample to ambient temperature, the epoxy resin was respectively ground into a rectangular friction test specimen of 20mm (length) × 20mm (width) × 3mm (height) and a rectangular thermal conductivity test specimen of 10mm (length) × 10mm (width) × 1mm (height) with sandpaper. The thermal conductivity of the epoxy resin was 0.17W/mK. Before the friction test, the friction surfaces of the epoxy resin and epoxy composite material were polished smooth with #1200 sandpaper to a roughness Ra of 0.18-0.20 μm, and the friction pair was ultrasonically cleaned with alcohol for 10 min. At room temperature, the relative humidity is 60%, under the dry friction condition, the applied load is 10N, the swing is 5mm, and the frequency is 2 Hz. After 3600s test, the friction coefficient of the epoxy resin is 0.55, and the wear rate is 28.8 multiplied by 10-5mm3mN, abrasion volume 10384.0X 10- 5mm3. The wear surface is shown in FIG. 1 by scanning electron microscope, and the friction coefficient is shown in FIG. 3.
Example 2:
mixing 1.1g of Ti3C2MXene nanoplatelets and 0.2g nanocellulose were added to 20g of water and stirred at 120rpm for 5 hours under ice bath conditions to obtain uniform Ti3C2MXene/cellulose solution. The obtained Ti3C2MXene/cellulose solution was poured into a polypropylene container (30 ml). The container bottomIs replaced by a copper block, and the periphery of the container is wrapped with heat insulation cotton. And then, placing the copper block at the bottom of the container on a cold source table, setting the temperature to be-120 ℃, and performing directional freezing. When the liquid is completely frozen into ice, putting the ice into a vacuum freeze dryer, and freeze-drying for 3 days at-60 ℃ and 5Pa to obtain Ti3C2The three-dimensional network structure block of MXene nanometer sheet. The prepared Ti3C2Putting the three-dimensional network structure block of the MXene nanosheet into a container prepared from aluminum foil paper, adding 18.7g of epoxy resin, and degassing at 50 ℃ for 24h under a vacuum condition to ensure that the epoxy resin is fully immersed into the three-dimensional structure block. Finally, the sample was pre-cured in an oven at 135 ℃ for 2h and post-cured at 165 ℃ for 14h to achieve sample cure. Ti in this sample3C2The mass fraction of MXene nano-sheets is 5.5%. After cooling the cured sample to ambient temperature, the composite material was respectively polished with sandpaper into a rectangular friction test specimen of 20mm (length) × 20mm (width) × 3mm (height) and a rectangular thermal conductivity test specimen of 10mm (length) × 10mm (width) × 1mm (height). The thermal conductivity of the composite material is 0.24W/mK. Before the rubbing test, the rubbing surface of the composite material was polished smooth with #1200 sandpaper to a roughness Ra of 0.18 to 0.20 μm, and the rubbing pair was ultrasonically cleaned with alcohol for 10 min. At room temperature, the relative humidity is 60%, under the dry friction condition, the applied load is 10N, the swing is 5mm, and the frequency is 2 Hz. After 3600s, has Ti3C2The friction coefficient of the epoxy composite material with the MXene nanosheet three-dimensional network structure is 0.07, and the wear rate is 14.4 multiplied by 10-5mm3mN, abrasion volume 5190.3X 10-5mm3. The wear surface is shown in FIG. 2 by scanning electron microscope, and the friction coefficient is shown in FIG. 3.
Claims (1)
1. The method for improving the tribological performance of the epoxy resin is characterized in that a two-dimensional material Ti is formed by a unidirectional cooling and freeze drying method3C2The epoxy resin composite material is prepared by taking the three-dimensional network structure of MXene nanosheets and cellulose as a framework, and the tribological and thermal properties of the epoxy resin are improved by the following steps:
1) from 5 to 20wt% of Ti3C2MXene nano-sheet and 1-2 wt% of nano-cellulose are added into water to form Ti3C2MXene/cellulose aqueous solution, stirring at 50-130rpm for 1-10h under ice bath condition to obtain uniformly dispersed Ti3C2MXene/cellulose water solution; wherein, Ti3C2The MXene nano-sheet has the transverse dimension of 0.5-2.4 μm, the average dimension of 1-1.2 μm, the thickness of 2-20nm and-OH and-F groups on the surface; the mass ratio of the nano-cellulose to water is 1:100, and the surface of the nano-cellulose is modified to have-COOH and-OH groups;
2) the obtained Ti3C2Placing MXene/cellulose solution in a container, and wrapping heat preservation cotton around the container; then, the bottom of the container is cooled, the temperature is set to be-40 ℃ to-196 ℃, and directional freezing is carried out;
3）Ti3C2freezing MXene/cellulose solution into ice, placing into vacuum freeze drying machine, freeze drying at-40 deg.C to-60 deg.C under 2-10Pa for 3-5 days to obtain Ti3C2A three-dimensional network structure block of MXene nanosheets;
4) the prepared Ti3C2Putting the three-dimensional network structure block of the MXene nanosheet into a container prepared from aluminum foil paper, adding 79-94 wt% of epoxy resin, and degassing at 35-60 ℃ under a vacuum condition for 6-48h to ensure that the epoxy resin is fully immersed into the three-dimensional structure block;
5) epoxy curing to shape the sample; cooling the cured sample to ambient temperature, polishing the composite material by using sand paper, and removing redundant epoxy resin on the edge to obtain the composite material with a three-dimensional structure; having Ti3C2The thermal conductivity of the epoxy composite material with the MXene nanosheet three-dimensional network structure is 0.24-0.27W/mK; the thermal conductivity of the epoxy resin is 0.15-0.17W/mK; the thermal conductivity of the modified composite material is improved by 41.2 percent compared with that of pure epoxy resin.
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| CN112961723B (en) * | 2021-02-26 | 2022-07-01 | 陕西科技大学 | MXene @ COFs/liquid metal-based lubricating additive, and preparation method, application and composite material thereof |
| CN113337145B (en) * | 2021-06-03 | 2022-03-01 | 苏州大学 | MXene reinforced silicate adhesive ceramic coating and preparation method thereof |
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| CN114874585A (en) * | 2022-05-05 | 2022-08-09 | 哈尔滨工业大学 | Preparation method of MXene reinforced resin matrix composite material |
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