CN108154947A - A kind of composite material of graphene coated resin particle and its preparation method and application - Google Patents
A kind of composite material of graphene coated resin particle and its preparation method and application Download PDFInfo
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- CN108154947A CN108154947A CN201611108036.7A CN201611108036A CN108154947A CN 108154947 A CN108154947 A CN 108154947A CN 201611108036 A CN201611108036 A CN 201611108036A CN 108154947 A CN108154947 A CN 108154947A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/14—Solid materials, e.g. powdery or granular
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
Abstract
The invention discloses a kind of composite materials of graphene coated resin particle and its preparation method and application, belong to new material and its applied technical field.It using graphene aqueous dispersion and water-absorbing resin as raw material, is expanded using water-absorbing resin water suction volume, the characteristics of dry bulk contraction, the graphene coated resin particle composite material of size tunable is prepared by simple processing step.Prepared composite material granular graphene uniform is closely coated on resin matrix surface, forms completely stable shell structurre.Due to the excellent conduction of graphene itself, heat conductivility, such graphene coated resin particle material can be applied to heat conduction, conduction and the preparation for being electromagnetically shielded composite polymer material as heat conduction, conductive filler.
Description
Technical field
The present invention relates to new material and its applied technical fields, and in particular to a kind of graphene coated resin particle it is compound
Material and its preparation method and application.
Background technology
With the development of science and technology, heat conduction, conductive polymer composite obtain more and more extensive answer in every field
With.Compared with traditional metal materials, heat conduction, conductive polymer composite have lightweight, flexibility, corrosion-resistant and inexpensive etc.
Advantage.In general, organic polymer matrix is all the non-conductor of heat and electricity in itself, and direct use, which can not obtain, preferably to be led
Heat, electric conductivity.Addition heat conduction, conductive filler is needed to form the thermal conductivity network of connection in the base with reality in composite material
Existing heat conduction, conductive effect.Traditional heat conduction, conductive filler generally there are autologous density it is excessive, expensive (such as silver) or itself
The shortcomings of heat conduction, electric conductivity relatively low (such as aluminium oxide, aluminium powder), seriously constrain filler correlated performance (such as electric conductivity, heat conduction
Property, capability of electromagnetic shielding etc.) further promotion.
Graphene be it is a kind of by single layer of carbon atom by sp2 hydridization and the tightly packed bi-dimensional cellular shape crystal knot formed
Structure.Although graphene experimentally finds the time for only having 10 years till now, its many excellent properties cause people
Extensive concern.Due to the stringent two-dimensional structure of graphene and high crystallography quality, graphene has excellent heat conduction, leads
Electrical property, thermal conductivity factor are up to 5300W m-1K-1, higher than carbon nanotube and diamond.In addition graphene is by monolayer carbon original
The cellular perfect lattice that son is formed, has very high structural stability and chemical stability, therefore by the use of graphene as newly
Type high-efficiency heat conduction, conductive filler have very big application potential.
But it if is directly used graphene as heat conduction, conductive filler：Due to graphene film diameter generally 10 μm with
Under, it is not easy to be overlapped to form heat conduction, the conductive path of long-range in composite material preparation process；And graphene is lazy as nano-material surface
Property it is strong, radius-thickness ratio is big, easily reunite, difficulties in dispersion；A large amount of additions of graphene simultaneously are also unfavorable for reduction composite material and are prepared into
This.
Invention content
In order to solve the above problem encountered in grapheme material application, the present invention provides a kind of graphene coated resin
Composite material of grain and its preparation method and application, by specific clad structure, makes graphene microchip closely be overlapped on resin base
Body surface face forms long-range heat conduction, conductive path；Simultaneously because cladding Graphite During The Process alkene microplate is sprawled, and have inner base
The support of resin, therefore the agglomeration of graphene can be effectively reduced and reduce graphene dosage.
To achieve the above object, the technical solution adopted in the present invention is as follows：
A kind of composite material of graphene coated resin particle, the composite material are that tree is closely coated on by graphene uniform
The core-shell structure that fat particle-matrix surface is formed, wherein：The resin particle is core, the graphene microchips of resin particle surfaces it
Between closely connect, form completely stable shell structurre.
For different application demands, the particle size and shape of the composite material pass through grain size needed for selection and shape
Resin particle matrix be adjusted, the particle size range of the resin particle is 10 μm of -3mm.
The graphene accounts for 1-55% in the composite material, and the density of the composite material is less than
1.5g/cm3。
The preparation method of the composite material of the graphene coated resin particle, includes the following steps：
(1) particulate water-absorbing resin matrix is added in homodisperse graphene aqueous dispersion, obtains mixture
Material；The weight ratio of the water-absorbing resin and graphene aqueous dispersion is 1:(10-1000), graphene aqueous dispersion
A concentration of 0.5-20mg/ml；
(2) water swelling of water-absorbing resin：Mechanical agitation, (rotating speed 50-200 are carried out to mixed material obtained by step (1)
Rev/min, mixing time 0.5-2 hours)；So that the abundant water swelling of resin particle, while graphene sheet layer is made to be adhered to tree
Fat matrix surface；
(3) the dry of water-absorbing resin is shunk：Resin after water swelling is put into convection oven, in 70-120 DEG C of condition
Lower dry 1-3 hours；In drying process, with the continuous contraction of resin particle volume, graphene uniform is closely coated on it
Surface, and graphene sheet layer closely connects to form conductive and heat conduction skeleton, so as to obtain the graphene coated resin particle
Composite material.
In the graphene aqueous dispersion, the graphene is graphene oxide, intercalation removes graphene, electrolysis legal system
The mixing of one or more of graphene prepared by standby graphene or chemical vapour deposition technique.
When preparing mixed material in above-mentioned steps (1), when the graphene is graphene oxide, by particulate water-absorbing tree
Aliphatic radical body and reducing agent (ascorbic acid or hydroiodic acid) are added in homodisperse graphene aqueous dispersion, obtain mixture
Material；Ratio in the ascorbic acid and graphene aqueous dispersion is 1g:(300-500)ml.
The water-absorbing resin matrix is polyacrylic resin, starch grafted acrylate class, graft acrylamide, high substitution
Spend cross-linked carboxymethyl cellulose, cross-linked carboxymethyl cellulose graft acrylamide, cross-linking type hydroxyethyl cellulose or grafted propylene
There is amide polymer etc. excellent hydrophily, water suction volume to expand, the high-molecular organic material of dehydration shrinkage.
The composite material of the above-mentioned graphene coated resin particle of the present invention is applied to lead as heat conduction and/or conductive filler
Heat, conductive and/or electromagnetic shielding composite material preparation.
Design Mechanism of the present invention is as follows：
The present invention is to pass through the water swelling of water-absorbing resin as raw material with water-absorbing resin using graphene aqueous dispersion
Graphene is completed in the cladding of resin matrix surface uniform close with the dry process shunk, and obtains the graphene coated resin
The composite material of particle.
The core-shell structure of the graphene coated resin particle, since resin particle is in water swelling and dehydration shrinkage mistake
Volume change in journey and surface is caused to generate a large amount of folds, these pleated structures have graphene coated layer pinning fixed function,
Therefore the even closer stabilization of graphene coated shell structurre formed.
Since grapheme material and resin matrix are respectively provided with lighter density, prepared graphene coated resin
Granule density is less than 1.5g/cm3, far below conventional thermal conductive, conductive filler, it is advantageously implemented the lighting of composite material.
Based on the excellent heat conduction of graphene itself, electric conductivity, prepared graphene coated resin particle can conduct
Heat conduction, conductive filler are applied to the preparation of heat conduction, conduction and electromagnetic shielding composite material.
The graphene coated resin particle preparation method is simple, and it is special not need to carry out graphene and resin matrix
Processing, it is only necessary to using resin matrix water swelling in graphene aqueous dispersion, dry dehydration shrinkage principle, simple technique
Preparation can be completed in flow, is easy to mass produce.
The invention has the advantages that：
1st, it is used as thermal conductivity filler, such graphene coated resin particle material has compared with graphene dry powder
Have：Airborne dust is not generated, it is easy to use；Bigger grain size easily builds thermal conductivity network；The reunion of graphene sheet layer is avoided, is easily disperseed
The features such as.
2nd, due to the pinning fixed function of resin matrix surface folding, what graphene was closely stablized is coated on resin matrix table
Face.Prepared graphite coat resin particle density is advantageously implemented composite material light far below conventional thermal conductive, conductive filler
Change.
3rd, the resin material is the common raw material of industry, cheap and easy to get.Composite material preparation process is simple, easily realizes big rule
Mould industrialized production.
Description of the drawings
Fig. 1 is graphene coated resin particle structure diagram.
Fig. 2 is graphene coated resin particle preparation flow figure.
Fig. 3 is graphene coated resin particle optical photograph.
Fig. 4 is graphene coated resin particle stereoscan photograph.
Fig. 5 is graphene coated resin particle stereoscan photograph.
Specific embodiment
The present invention is the composite material of graphene coated resin particle, and structure diagram is as shown in Figure 1.The composite material
It is that the core-shell structure that resin particle matrix surface is formed closely is coated on by graphene uniform, wherein：The resin particle is core,
It is closely connected between the graphene microchip of resin particle surfaces, forms completely stable shell structurre.
The composite material and preparation method thereof of the graphene coated resin particle, concrete technology flow process are as follows (shown in Fig. 2)：
By suitable resin base particle, (resin particle is 1 with solution quality ratio:1000 to 1：10) it is added to a certain concentration (0.5mg/
Ml to 20mg/ml) homodisperse graphene aqueous dispersion in；Mechanical agitation allows the abundant water swelling of resin particle, stone
Black alkene lamella is adhered to resin matrix surface；Above-mentioned resin is put into convection oven, (70 DEG C to 120 DEG C) fill at a certain temperature
Point drying, as resin particle volume contraction graphene uniform is closely coated on its surface to get to graphene coated resin
Particulate composite.
Due to resin particle during water swelling and dehydration shrinkage volume change and surface is caused to generate a large amount of folds,
These pleated structures have pinning fixed function to graphene coated layer, therefore the graphene coated shell structurre formed is more stepped up
Close stabilization.Prepared graphene coated resin particle density is less than 1.5g/cm3, far below conventional thermal conductive, conductive filler, have
Conducive to the lighting for realizing composite material.
Based on the excellent heat conduction of graphene itself, electric conductivity, prepared graphene coated resin particle can conduct
Heat conduction, conductive filler are applied to the preparation of heat conduction, conduction and electromagnetic shielding composite material.
Embodiment 1：
It is first that the graphene oxide dispersion 400ml of a concentration of 2mg/ml is 30 minutes ultrasonic, add in reducing agent ascorbic acid
1g, 300 revs/min of rotating speeds of mechanical agitation stir 10 minutes.
The polyacrylic acid water-absorbing resin bead that 4g grain sizes are 2mm, mechanical agitation 100 are added in into graphene oxide dispersion
Rev/min rotating speed stirs 30 minutes.
The graphite coat resin particle fully to absorb water is put into convection oven, is dried and dehydrated at 110 DEG C, time setting
2 hours.Graphene coated resin particle material can be prepared by above-mentioned simple technological process.
The macro morphology of graphene coated resin particle obtained is as shown in the optical photograph in Fig. 3.The microcosmic shape of material
Looks are as shown in the stereoscan photograph in Fig. 4.As can be seen that graphene uniform is closely coated on resin matrix table from photo
Face closely connects between graphene microchip, forms heat conduction, the conducting matrix grain structure of connection.Due to other embodiment and this example sample
The pattern of product is close, behind repeat no more.
The density of composite material prepared by the present embodiment is 1.5g/cm3.Due to the excellent heat conduction of graphene itself, lead
Electrical property, the high efficiency packing that the composite material of prepared graphene coated resin particle can be excellent as heat conduction, electric conductivity
Preparation applied to heat conduction, conduction and electromagnetic shielding composite material.
Embodiment 2：
It is first that the graphene oxide dispersion 400ml of a concentration of 2mg/ml is 30 minutes ultrasonic, add in reducing agent ascorbic acid
1g, 300 revs/min of rotating speeds of mechanical agitation stir 10 minutes.
The polyacrylic acid water-absorbing resin bead that 2g grain sizes are 200 μm, mechanical agitation are added in into graphene oxide dispersion
100 revs/min of rotating speeds stir 30 minutes.
The graphite coat resin particle fully to absorb water is put into convection oven, is dried and dehydrated at 110 DEG C, time setting
2 hours.Graphene coated resin particle material can be prepared by above-mentioned simple technological process.
The density of composite material prepared by the present embodiment is 1.3g/cm3.Due to the excellent heat conduction of graphene itself, lead
Electrical property, the high efficiency packing that the composite material of prepared graphene coated resin particle can be excellent as heat conduction, electric conductivity
Preparation applied to heat conduction, conduction and electromagnetic shielding composite material.
Embodiment 3：
It is first that the graphene oxide dispersion 400ml of a concentration of 2mg/ml is 30 minutes ultrasonic, add in reducing agent ascorbic acid
1g, 300 revs/min of rotating speeds of mechanical agitation stir 10 minutes.
The polyacrylic acid water-absorbing resin bead that 1g grain sizes are 100 μm, mechanical agitation are added in into graphene oxide dispersion
100 revs/min of rotating speeds stir 30 minutes.
The graphite coat resin particle fully to absorb water is put into convection oven, is dried and dehydrated at 110 DEG C, time setting
2 hours.Graphene coated resin particle material can be prepared by above-mentioned simple technological process.
The density of composite material prepared by the present embodiment is 1.2g/cm3.Due to the excellent heat conduction of graphene itself, lead
Electrical property, the high efficiency packing that the composite material of prepared graphene coated resin particle can be excellent as heat conduction, electric conductivity
Preparation applied to heat conduction, conduction and electromagnetic shielding composite material.
Embodiment 4：
It is first that the graphene oxide dispersion 400ml of a concentration of 2mg/ml is 30 minutes ultrasonic, add in reducing agent ascorbic acid
1g, 300 revs/min of rotating speeds of mechanical agitation stir 10 minutes.
The polyacrylic acid water-absorbing resin bead that 1g grain sizes are 50 μm, mechanical agitation are added in into graphene oxide dispersion
100 revs/min of rotating speeds stir 30 minutes.
The graphite coat resin particle fully to absorb water is put into convection oven, is dried and dehydrated at 110 DEG C, time setting
2 hours.Graphene coated resin particle material can be prepared by above-mentioned simple technological process.
The density of composite material prepared by the present embodiment is 1.1g/cm3.Due to the excellent heat conduction of graphene itself, lead
Electrical property, the high efficiency packing that the composite material of prepared graphene coated resin particle can be excellent as heat conduction, electric conductivity
Preparation applied to heat conduction, conduction and electromagnetic shielding composite material.
Embodiment 5：
It is first that the graphene oxide dispersion 400ml of a concentration of 6mg/ml is 30 minutes ultrasonic, add in reducing agent ascorbic acid
3g, 300 revs/min of rotating speeds of mechanical agitation stir 10 minutes.
The polyacrylic acid water-absorbing resin bead that 1g grain sizes are 100 μm, mechanical agitation are added in into graphene oxide dispersion
100 revs/min of rotating speeds stir 30 minutes.
The graphite coat resin particle fully to absorb water is put into convection oven, is dried and dehydrated at 110 DEG C, time setting
2 hours.Graphene coated resin particle material can be prepared by above-mentioned simple technological process.
The density of composite material prepared by the present embodiment is 1.3g/cm3.Due to the excellent heat conduction of graphene itself, lead
Electrical property, the high efficiency packing that the composite material of prepared graphene coated resin particle can be excellent as heat conduction, electric conductivity
Preparation applied to heat conduction, conduction and electromagnetic shielding composite material.
Embodiment 6：
It is first that the intercalated graphite alkene dispersion liquid 400ml of a concentration of 2mg/ml is 30 minutes ultrasonic.
The polyacrylic acid water-absorbing resin bead that 1g grain sizes are 100 μm, mechanical agitation are added in into intercalated graphite alkene dispersion liquid
100 revs/min of rotating speeds stir 30 minutes.
The graphite coat resin particle fully to absorb water is put into convection oven, is dried and dehydrated at 110 DEG C, time setting
2 hours.Graphene coated resin particle material can be prepared by above-mentioned simple technological process.Graphene coated tree is made
The microscopic appearance of fat particle is as shown in Figure 5.
The density of composite material prepared by the present embodiment is 1.1g/cm3.Due to the excellent heat conduction of graphene itself, lead
Electrical property, the high efficiency packing that the composite material of prepared graphene coated resin particle can be excellent as heat conduction, electric conductivity
Preparation applied to heat conduction, conduction and electromagnetic shielding composite material.
Embodiment 7：
It is first that the intercalated graphite alkene dispersion liquid 400ml of a concentration of 2mg/ml is 30 minutes ultrasonic.
The polyacrylic acid water-absorbing resin bead that 1g grain sizes are 50 μm, mechanical agitation are added in into intercalated graphite alkene dispersion liquid
100 revs/min of rotating speeds stir 30 minutes.
The graphite coat resin particle fully to absorb water is put into convection oven, is dried and dehydrated at 110 DEG C, time setting
2 hours.Graphene coated resin particle material can be prepared by above-mentioned simple technological process.
The density of composite material prepared by the present embodiment is 1.0g/cm3.Due to the excellent heat conduction of graphene itself, lead
Electrical property, the high efficiency packing that the composite material of prepared graphene coated resin particle can be excellent as heat conduction, electric conductivity
Preparation applied to heat conduction, conduction and electromagnetic shielding composite material.
Embodiment 8：
It is first that the intercalated graphite alkene dispersion liquid 400ml of a concentration of 10mg/ml is 30 minutes ultrasonic.
The polyacrylic acid water-absorbing resin bead that 1g grain sizes are 50 μm, mechanical agitation are added in into intercalated graphite alkene dispersion liquid
100 revs/min of rotating speeds stir 30 minutes.
The graphite coat resin particle fully to absorb water is put into convection oven, is dried and dehydrated at 110 DEG C, time setting
2 hours.Graphene coated resin particle material can be prepared by above-mentioned simple technological process.
The density of composite material prepared by the present embodiment is 1.3g/cm3.Due to the excellent heat conduction of graphene itself, lead
Electrical property, the high efficiency packing that the composite material of prepared graphene coated resin particle can be excellent as heat conduction, electric conductivity
Preparation applied to heat conduction, conduction and electromagnetic shielding composite material.
Embodiment 9：
It is first that the intercalated graphite alkene dispersion liquid 400ml of a concentration of 2mg/ml is 30 minutes ultrasonic.
The polyacrylic acid water-absorbing resin bead that 0.5g grain sizes are 10 μm, mechanical agitation are added in into intercalated graphite alkene dispersion liquid
100 revs/min of rotating speeds stir 30 minutes.
The graphite coat resin particle fully to absorb water is put into convection oven, is dried and dehydrated at 110 DEG C, time setting
2 hours.Graphene coated resin particle material can be prepared by above-mentioned simple technological process.
The density of composite material prepared by the present embodiment is 1.0g/cm3.Due to the excellent heat conduction of graphene itself, lead
Electrical property, the high efficiency packing that the composite material of prepared graphene coated resin particle can be excellent as heat conduction, electric conductivity
Preparation applied to heat conduction, conduction and electromagnetic shielding composite material.
Embodiment 10：
It is first that the graphene oxide dispersion 400ml of a concentration of 2mg/ml is 30 minutes ultrasonic, add in reducing agent ascorbic acid
1g, 300 revs/min of rotating speeds of mechanical agitation stir 10 minutes.
The graft acrylamide water-absorbing resin bead that 1g grain sizes are 50 μm is added in into graphene oxide dispersion, machinery stirs
100 revs/min of rotating speeds are mixed to stir 30 minutes.
The graphite coat resin particle fully to absorb water is put into convection oven, is dried and dehydrated at 110 DEG C, time setting
2 hours.Graphene coated resin particle material can be prepared by above-mentioned simple technological process.
The density of composite material prepared by the present embodiment is 1.2g/cm3.Due to the excellent heat conduction of graphene itself, lead
Electrical property, the high efficiency packing that the composite material of prepared graphene coated resin particle can be excellent as heat conduction, electric conductivity
Preparation applied to heat conduction, conduction and electromagnetic shielding composite material.
Embodiment 11：
The graphene oxide dispersion 400ml ultrasounds first prepared by a concentration of 2mg/ml electrolysis 30 minutes, add in reduction
Agent ascorbic acid 1g, 300 revs/min of rotating speeds of mechanical agitation stir 10 minutes.
The polyacrylic acid water-absorbing resin bead that 1g grain sizes are 50 μm, mechanical agitation are added in into graphene oxide dispersion
100 revs/min of rotating speeds stir 30 minutes.
The graphite coat resin particle fully to absorb water is put into convection oven, is dried and dehydrated at 110 DEG C, time setting
2 hours.Graphene coated resin particle material can be prepared by above-mentioned simple technological process.
The density of composite material prepared by the present embodiment is 1.1g/cm3.The excellent heat conduction of graphene itself, electric conductivity
Can, the high efficiency packing application that the composite material of prepared graphene coated resin particle can be excellent as heat conduction, electric conductivity
In the preparation of heat conduction, conduction and electromagnetic shielding composite material.
Embodiment 12：
It is first that the graphene oxide dispersion 400ml of a concentration of 2mg/ml is 30 minutes ultrasonic, add in reducing agent hydroiodic acid
5ml, 300 revs/min of rotating speeds of mechanical agitation stir 10 minutes.
The polyacrylic acid water-absorbing resin bead that 1g grain sizes are 100 μm, mechanical agitation are added in into graphene oxide dispersion
100 revs/min of rotating speeds stir 30 minutes.
The graphite coat resin particle fully to absorb water is put into convection oven, is dried and dehydrated at 110 DEG C, time setting
2 hours.Graphene coated resin particle material can be prepared by above-mentioned simple technological process.
The density of composite material prepared by the present embodiment is 1.2g/cm3.Due to the excellent heat conduction of graphene itself, lead
Electrical property, the high efficiency packing that the composite material of prepared graphene coated resin particle can be excellent as heat conduction, electric conductivity
Preparation applied to heat conduction, conduction and electromagnetic shielding composite material.
Examples provided above is only the mode illustrated, is not considered as limiting the scope of the present invention, appoint
What is subject to the method for equivalent substitution or change according to the technical scheme of the invention and its inventive conception, should all cover the present invention's
Within protection domain.
Claims (9)
1. a kind of composite material of graphene coated resin particle, it is characterised in that：The composite material is tight by graphene uniform
The close core-shell structure for being coated on the formation of resin particle matrix surface, wherein：The resin particle be core, the stone of resin particle surfaces
It is closely connected between black alkene microplate, forms completely stable shell structurre.
2. the composite material of graphene coated resin particle according to claim 1, it is characterised in that：The graphene exists
1-55% is accounted in the composite material.
3. the composite material of graphene coated resin particle according to claim 1 or 2, it is characterised in that：It is described compound
The particle size and shape of material are adjusted by the resin particle matrix of grain size needed for selection and shape, the resin particle
Particle size range be 10 μm of -3mm.
4. the composite material of graphene coated resin particle according to claim 1, it is characterised in that：The composite material
Density is less than 1.5g/cm3。
5. the preparation method of the composite material of graphene coated resin particle according to claim 1, it is characterised in that：It should
This method comprises the following steps for method：
(1) particulate water-absorbing resin matrix is added in homodisperse graphene aqueous dispersion, obtains mixed material；Institute
The weight ratio for stating water-absorbing resin and graphene aqueous dispersion is 1:(10-1000), graphene aqueous dispersion it is a concentration of
0.5-20mg/ml；
(2) water swelling of water-absorbing resin：Mechanical agitation is carried out to mixed material obtained by step (1), resin particle is made fully to inhale
Water expands, while graphene sheet layer is made to be adhered to resin matrix surface；
(3) the dry of water-absorbing resin is shunk：Resin after water swelling is put into convection oven, is done under the conditions of 70-120 DEG C
It is 1-3 hours dry；In drying process, with the continuous contraction of resin particle volume, graphene uniform is closely coated on its table
Face, and graphene sheet layer closely connects to form conductive and heat conduction skeleton, so as to obtain answering for the graphene coated resin particle
Condensation material.
6. the preparation method of the composite material of graphene coated resin particle according to claim 5, it is characterised in that：Institute
It states in graphene aqueous dispersion, the graphene that the graphene is graphene oxide, intercalation removes graphene, prepared by electrolysis
Or one or more of graphene of chemical vapour deposition technique preparation mixing.
7. the preparation method of the composite material of graphene coated resin particle according to claim 6, it is characterised in that：Step
When preparing mixed material in (1) suddenly, when the graphene is graphene oxide, by particulate water-absorbing resin matrix and reducing agent
(ascorbic acid or hydroiodic acid) is added in homodisperse graphene aqueous dispersion, obtains mixed material；The Vitamin C
Acid is 1g with the ratio in graphene aqueous dispersion:(300-500)ml.
8. the preparation method of the composite material of graphene coated resin particle according to claim 5, it is characterised in that：Institute
It is fine for polyacrylic resin, starch grafted acrylate class, graft acrylamide, high substituted degree cross-linked carboxymethyl to state water-absorbing resin
Tie up the tools such as element, cross-linked carboxymethyl cellulose graft acrylamide, cross-linking type hydroxyethyl cellulose or graft acrylamide polymer
There are excellent hydrophily, water suction volume to expand, the high-molecular organic material of dehydration shrinkage.
9. the application of the composite material of graphene coated resin particle according to claim 1, it is characterised in that：This is compound
Material is applied to the preparation of heat conduction, conduction and/or electromagnetic shielding composite material as heat conduction and/or conductive filler.
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| WO2020077365A1 (en) * | 2018-10-12 | 2020-04-16 | Xg Sciences, Inc. | Graphene coated particulate |
| CN113105871A (en) * | 2021-04-09 | 2021-07-13 | 中国科学院山西煤炭化学研究所 | Phase-change heat storage material with bionic structure and preparation method and application thereof |
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