CN110818927A - Heat-conducting gelatin composite film and preparation method thereof - Google Patents
Heat-conducting gelatin composite film and preparation method thereof Download PDFInfo
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Abstract
The invention provides a heat-conducting gelatin composite film and a preparation method thereof, wherein the method comprises the following steps: dispersing boron nitride in deionized water and performing ultrasonic dispersion treatment to prepare boron nitride micron-sheet dispersion liquid; adding dopamine into the boron nitride micron sheet dispersion liquid and mixing to generate polydopamine on the surface of the boron nitride micron sheet to obtain a modified boron nitride micron sheet; adding the modified boron nitride micron sheet into a gelatin water solution and carrying out ultrasonic dispersion treatment to obtain a composite dispersion liquid; and preparing the composite dispersion liquid into gel, and dehydrating the gel to obtain the heat-conducting gelatin composite film. The gelatin composite film with high thermal conductivity coefficient can be obtained by the method provided by the invention, and has important application value.
Description
Technical Field
The invention relates to the field of natural polymer materials, in particular to a heat-conducting gelatin composite film and a preparation method thereof.
Background
With the arrival of the information era, the microelectronic industry with high integration, miniaturization and multifunction is rapidly developed, the requirements of electronic devices and electronic equipment on heat dissipation materials are continuously improved, and the traditional high-mechanical and high-heat-conducting-performance materials have different defects and are difficult to meet the requirements of the wanted industry on the diversity of heat conduction materials. Therefore, the development of novel high-mechanical and high-thermal-conductivity composite materials to meet the application requirements of different application fields is an important research direction at present.
Gelatin is a natural polymer material, and due to the advantages of good biocompatibility, high elasticity, low cost, easy acquisition and the like, the hydrogel of the gelatin is widely applied to the fields of biomedicine, solid electrolyte and the like. The gelatin can also be subjected to a sol-gel-film forming process to obtain the gelatin flexible film with the advantages of no toxicity, excellent mechanical property, biocompatibility and the like.
But the low thermal conductivity of the gelatin flexible film limits the application of the gelatin flexible film in electronic devices.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a heat-conducting gelatin composite film and a preparation method thereof, and aims to solve the problem of low heat conductivity of the conventional gelatin film.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a preparation method of a heat-conducting gelatin composite film comprises the following steps:
dispersing boron nitride in deionized water and performing ultrasonic dispersion treatment to prepare boron nitride micron-sheet dispersion liquid;
adding dopamine into the boron nitride micron sheet dispersion liquid and mixing to generate polydopamine on the surface of the boron nitride micron sheet to obtain a modified boron nitride micron sheet;
adding the modified boron nitride micron sheet into a gelatin water solution and carrying out ultrasonic dispersion treatment to obtain a composite dispersion liquid;
and preparing the composite dispersion liquid into gel, and dehydrating the gel to obtain the heat-conducting gelatin composite film.
The preparation method of the heat-conducting gelatin composite film comprises the step of preparing a heat-conducting gelatin composite film, wherein the boron nitride is hexagonal boron nitride.
The preparation method of the heat-conducting gelatin composite film comprises the following steps of adding dopamine into the boron nitride micron sheet dispersion liquid, mixing the dopamine and the boron nitride micron sheet dispersion liquid to generate polydopamine on the surface of the boron nitride micron sheet, and obtaining the modified boron nitride micron sheet:
adding dopamine into the boron nitride micron-sheet dispersion liquid, and mixing and stirring to prepare a mixed solution;
adding a buffering agent into the mixed solution, stirring, adjusting the mixed solution to be alkaline, enabling dopamine to generate redox polymerization reaction in an alkaline environment, and generating polydopamine on the surface of the boron nitride micrometer piece to obtain the modified boron nitride micrometer piece.
According to the preparation method of the heat-conducting gelatin composite film, the dopamine is subjected to redox polymerization reaction in an alkaline environment, and in the step of generating polydopamine on the surface of the boron nitride micron sheet, the reaction temperature is 20-60 ℃, and the reaction time is 6-24 hours.
The preparation method of the heat-conducting gelatin composite film comprises the step of mixing the gelatin with the mixed solution, wherein the pH value of the mixed solution is 8-10.
The preparation method of the heat-conducting gelatin composite film comprises the following steps of (1-2): 1.
the preparation method of the heat-conducting gelatin composite film comprises the following steps of preparing the composite dispersion liquid into gel, and preparing the heat-conducting gelatin composite film after the gel is dehydrated:
pouring the composite dispersion liquid into a mould, and preparing gel at 0-10 ℃ for later use;
and drying the gel at the temperature of 20-50 ℃ to remove water, thus obtaining the heat-conducting gelatin composite film.
The preparation method of the heat-conducting gelatin composite film comprises the following step of preparing the heat-conducting gelatin composite film, wherein the heat-conducting gelatin composite film comprises 10-80% of modified boron nitride micrometer sheets in percentage by weight.
The preparation method of the heat-conducting gelatin composite film comprises the following steps of dispersing boron nitride in deionized water and carrying out ultrasonic dispersion treatment to prepare boron nitride micron-sheet dispersion liquid:
mixing boron nitride and deionized water according to the mass ratio of 1:200-300, and carrying out ultrasonic treatment for 2-4h to strip the boron nitride, thereby preparing the boron nitride micron-sheet dispersion liquid.
A heat-conducting gelatin composite film is prepared by the preparation method.
Has the advantages that: according to the invention, the boron nitride micron sheet is modified by polydopamine, so that the modified boron nitride micron sheet has better hydrophilicity, and is convenient to disperse in a gelatin aqueous solution for ultrasonic stripping to prepare a composite dispersion liquid; and (3) putting the composite dispersion liquid into a refrigerator to be gelatinized, and finally obtaining the flexible high-mechanical high-thermal-conductivity gelatin composite film through a gel dehydration film forming process. The gelatin composite film with high thermal conductivity coefficient can be obtained by the method provided by the invention, and has important application value.
Drawings
Fig. 1 is a flow chart of a method for preparing a thermally conductive gelatin composite film according to an embodiment of the present invention.
Fig. 2 is a diagram of a heat-conductive gelatin composite film prepared according to the present invention.
FIG. 3 is a cross-sectional electron microscope image of a thermally conductive gelatin composite film prepared according to the present invention.
FIG. 4 is a schematic diagram of the reaction mechanism of the modified boron nitride nanosheet of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a flow chart illustrating a method for manufacturing a heat conductive gelatin composite film according to a preferred embodiment of the present invention, which includes the following steps:
s100, dispersing boron nitride in deionized water and performing ultrasonic dispersion treatment to prepare boron nitride micron-sheet dispersion liquid;
s200, adding dopamine into the boron nitride micron sheet dispersion liquid, mixing, and generating polydopamine on the surface of the boron nitride micron sheet to obtain a modified boron nitride micron sheet;
s300, adding the modified boron nitride micron sheet into a gelatin water solution and carrying out ultrasonic dispersion treatment to obtain a composite dispersion liquid;
s400, preparing the composite dispersion liquid into gel, and dehydrating the gel to obtain the heat-conducting gelatin composite film.
In the embodiment, an aqueous solution of boron nitride is subjected to ultrasonic dispersion treatment, so that boron nitride is peeled to generate a dispersion liquid of boron nitride micro-sheets, dopamine is added into the dispersion liquid of the boron nitride micro-sheets and mixed, and then the dopamine is subjected to redox polymerization on the surfaces of the boron nitride micro-sheets to obtain a polydopamine product, and the polydopamine contains abundant hydroxyl groups, so that the polydopamine is deposited on the surfaces of the boron nitride micro-sheets to introduce a large number of hydroxyl groups into the boron nitride micro-sheets, the hydrophilicity of the boron nitride micro-sheets is greatly enhanced, and the boron nitride micro-sheets (BN @ PDA) modified by the polydopamine are obtained, and the hydrophilic BN @ PDA is conveniently and uniformly dispersed in an aqueous solution of gelatin;
adding BN @ PDA into a gelatin water solution, performing ultrasonic dispersion to obtain a uniformly dispersed composite solution, wherein the composite solution comprises BN @ PDA and gelatin components, rapidly preparing the composite solution into gel in order to prevent the BN @ PDA in the composite solution from precipitating, and drying and dehydrating the gel to form the heat-conducting gelatin composite film, as shown in figures 2 and 3; the boron nitride micron sheet has high heat conductivity and high insulativity, so that the BN @ PDA doped gelatin composite film has good heat conductivity and mechanical property.
In some embodiments, boron nitride and deionized water are mixed according to a mass ratio of 1:200-300 and subjected to ultrasonic treatment for 2-4 hours to strip the boron nitride, so as to prepare the boron nitride micron-scale sheet dispersion liquid. Since boron nitride has excellent thermal conductivity and high insulation, the embodiment selects boron nitride as the filler in the gelatin film, so that the gelatin film can obtain excellent thermal conductivity. In this embodiment, an aqueous solution of boron nitride is subjected to ultrasonic treatment, so that boron nitride is peeled into boron nitride nanosheets under the ultrasonic action, thereby obtaining a boron nitride nanosheet dispersion. In this embodiment, the boron nitride nanosheet structure obtained by ultrasonic stripping includes less than ten layers of boron nitride nanosheets and more than ten layers of boron nitride nanosheets.
In some embodiments, the boron nitride is hexagonal boron nitride, the hexagonal boron nitride is a two-dimensional material, and boron nitride micro-sheets formed by stripping the hexagonal boron nitride are dissolved in a gelatin solution, so that formation of a highly oriented lamellar structure is facilitated, and the prepared gelatin composite film has a better heat conduction effect.
In some embodiments, the step S200 includes: adding dopamine into the boron nitride micron-sheet dispersion liquid, and mixing and stirring to prepare a mixed solution; adding a buffering agent into the mixed solution, stirring, adjusting the mixed solution to be alkaline, and enabling the dopamine to generate redox polymerization reaction in an alkaline environment, so as to generate polydopamine on the surface of the boron nitride micrometer piece, wherein the reaction mechanism is shown in fig. 4; and after the reaction is finished, washing and drying to obtain the modified boron nitride micron sheet.
In some embodiments, the mixed solution has a mass ratio of dopamine to boron nitride nanosheets of 1-2: 1. within the mass ratio range, the modification effect of the polydopamine modified boron nitride micron sheet is better. If the content is less than the range, the boron nitride is too much, so that some boron nitride can not deposit poly-dopamine, the modification effect is poor, the hydrophilicity is weakened, and the dispersion effect in the gelatin aqueous solution is influenced; above this mass ratio range, too much dopamine may be self-polymerized into polymer particles that are not deposited on the boron nitride micro-sheet, and these polymer particles may lead to a material with reduced thermal conductivity.
In some embodiments, the pH of the mixed liquor is adjusted to 8-10 by adding a buffer. In this embodiment, the mixed solution is in a weakly alkaline environment, under this condition, the dopamine undergoes redox polymerization to obtain polydopamine, the polydopamine contains abundant hydroxyl groups, and a polydopamine product obtained by polymerization is deposited on the surface of the boron nitride nanosheet to introduce a large amount of hydroxyl groups into the boron nitride nanosheet, so that the hydrophilicity of the boron nitride nanosheet is improved.
In some embodiments, the buffer is tris.
In some embodiments, the dopamine undergoes redox polymerization in an alkaline environment at a temperature of 20-60 ℃ for a time of 6-24 hours. In this embodiment, the dopamine can rapidly and efficiently undergo redox polymerization, and polydopamine is generated on the surface of the boron nitride nanosheet.
In some embodiments, the washing after the reaction is finished adopts a centrifugal mode, the washing is firstly carried out for a plurality of times by using deionized water, then the washing is carried out for a plurality of times by using absolute ethyl alcohol, and finally the washing is put into a vacuum oven to be dried for 24 hours at 60 ℃ to obtain the BN @ PDA micron sheet.
In some embodiments, the step S300 includes: dissolving gelatin in deionized water to obtain gelatin water solution; and adding the polydopamine-modified boron nitride micron sheet into a gelatin water solution, and performing ultrasonic dispersion to obtain a BN @ PDA micron sheet/gelatin water dispersion (composite dispersion) which is peeled into a plurality of layers and is mixed in a few layers. In the embodiment, the BN @ PDA micron sheet can be uniformly dispersed in the gelatin water solution through ultrasonic dispersion, so that the prepared composite film can uniformly conduct heat, and the boron nitride micron sheet can be further peeled off through ultrasonic treatment, so that the dispersibility of the BN @ PDA micron sheet in the gelatin water solution is improved.
In some embodiments, the step 400 comprises: pouring the composite dispersion into a mold, and preparing gel at 0-10 ℃; and dehydrating the gel under certain drying conditions to obtain the heat-conducting gelatin composite film.
In the embodiment, the composite dispersion liquid is prepared into the gel at a low temperature, so that the boron nitride micron sheets in the gel can not be precipitated in the subsequent long-time drying, the micron sheets are ensured to be uniformly dispersed among gelatin molecules all the time, and the prepared composite film has good heat conductivity.
In some embodiments, the drying conditions are a drying temperature of 20 to 50 ℃ and a drying time of 12 to 72 hours. In the embodiment, the performance of the prepared film is better by adopting the drying condition. If the temperature is too low, the drying time is long, and the preparation efficiency is low; if the temperature is too high, the volatilization rate may be too high, and the film may be formed on the surface but not inside, making it difficult to determine the end time of the production.
In some embodiments, the polydopamine-modified boron nitride nanosheets comprise 10-80% of the total mass of the thermally conductive gelatin composite film. Within the range, the obtained heat-conducting gelatin composite film has better heat-conducting property and mechanical property; if the content exceeds the range, the content of the gelatin is low, so that the mechanical property of the composite film is possibly reduced, and the use of the composite film in flexible intelligent electronic equipment is limited.
The traditional method for preparing the composite material by using the heat-conducting filler, namely the boron nitride, needs to carry out centrifugal treatment on peeled boron nitride micron sheets so as to separate and screen out few-layer boron nitride sheet materials and then carry out the filler, the process needs to carry out at least one centrifugal separation, the preparation process is complex, the number of obtained few-layer boron nitride sheets is small, the peeling is possibly needed for many times, and the preparation efficiency is low.
Compared with the traditional preparation method, the invention firstly uses ultrasonic to pretreat the boron nitride to strip the boron nitride into micron sheets, then directly modifies the boron nitride with dopamine, and poly dopamine is deposited on the boron nitride micron sheets to realize the introduction of a large amount of hydrophilic groups, so that the mixed boron nitride micron sheets with few layers/multiple layers can be uniformly dispersed in aqueous solution and further subjected to ultrasonic treatment without carrying out centrifugal separation on large-particle boron nitride micron sheets, thereby improving the preparation efficiency and reducing the production energy consumption.
The method comprises the steps of preparing the micron sheet/gelatin aqueous dispersion into gel at low temperature to obtain the micron sheet/gelatin gel, and then obtaining the composite film in a gel dehydration film forming mode.
The invention also provides a heat-conducting gelatin composite film prepared by the method.
The present invention will be described in detail below with reference to specific examples.
Example 1
(1) 1g of BN was weighed into a beaker containing 250ml of deionized water and placed in a cell disruptor for ultrasonic dispersion for 4 hours.
(2) Adding 0.5g of dopamine into the BN dispersion solution in the step (1), adjusting the pH of the solution to 8.5 by using a Tri reagent, and carrying out magneton stirring reaction at 25 ℃ for 24 hours. After the reaction is finished, the mixture is firstly washed by deionized water for 3 times in a centrifugal mode, then washed by absolute ethyl alcohol for 3 times, and finally the centrifugal product is dried in a vacuum oven at 60 ℃ for 24 hours to obtain BN @ PDA.
(3) Preparing 0.9g of gelatin into a 5% aqueous solution by using deionized water, adding 0.1g of BN @ PDA, ultrasonically dispersing for 60min by using a cell crusher to obtain a BN @ PDA micron sheet/gelatin aqueous dispersion, pouring the aqueous dispersion into a mold, and placing the mold in a refrigerator to make the aqueous dispersion gel. And then taking out the gel, and volatilizing the water in the gel for 72 hours in the air atmosphere at room temperature to finally obtain the gelatin/BN @ PDA composite film with the BN @ PDA content of 10%.
Example 2
(1) 1g of BN was weighed into a beaker containing 300ml of deionized water and placed in a cell disruptor for ultrasonic dispersion for 3 hours.
(2) Adding 0.8g of dopamine into the BN dispersion solution in the step 1, adjusting the pH of the solution to 9 by using a Tri reagent, and carrying out a magneton stirring reaction at 60 ℃ for 6 hours. After the reaction is finished, the mixture is firstly washed by deionized water for 3 times in a centrifugal mode, then washed by absolute ethyl alcohol for 3 times, and finally the centrifugal product is dried in a vacuum oven at 60 ℃ for 24 hours to obtain BN @ PDA.
(3) Preparing 0.7g of gelatin into a 5% aqueous solution by using deionized water, adding 0.3g of BN @ PDA, ultrasonically dispersing for 60min by using a cell crusher to obtain a BN @ PDA micron sheet/gelatin aqueous dispersion, pouring the aqueous dispersion into a mold, and placing the mold in a refrigerator to make the aqueous dispersion gel. And then taking out the gel, and volatilizing the water in the gel for 12h at the temperature of 50 ℃ in the air atmosphere to finally obtain the gelatin/BN @ PDA composite film with the BN @ PDA content of 30%.
Example 3
(1) 1g of BN was weighed into a beaker containing 250ml of deionized water and placed in a cell disruptor for ultrasonic dispersion for 2 hours.
(2) Adding 0.8g of dopamine into the BN dispersion solution in the step 1, adjusting the pH of the solution to 8.3 by using a Tri reagent, and carrying out a magneton stirring reaction at 40 ℃ for 12 hours. After the reaction is finished, the mixture is firstly washed by deionized water for 3 times in a centrifugal mode, then washed by absolute ethyl alcohol for 3 times, and finally the centrifugal product is dried in a vacuum oven at 60 ℃ for 24 hours to obtain BN @ PDA.
(3) Preparing 0.7g of gelatin into a 5% aqueous solution by using deionized water, adding 0.3g of BN @ PDA, ultrasonically dispersing for 60min by using a cell crusher to obtain a BN @ PDA micron sheet/gelatin aqueous dispersion, pouring the aqueous dispersion into a mold, and placing the mold in a refrigerator to make the aqueous dispersion gel. And then taking out the gel, and volatilizing the water in the gel for 72 hours in the air atmosphere at room temperature to finally obtain the gelatin/BN @ PDA composite film with the BN @ PDA content of 30%.
Example 4
(1) 1g of BN was weighed into a beaker containing 250ml of deionized water and placed in a cell disruptor for ultrasonic dispersion for 4 hours.
(2) Adding 0.5g of dopamine into the BN dispersion solution in the step 1, adjusting the pH of the solution to 8.5 by using a Tri reagent, and carrying out magneton stirring reaction at 25 ℃ for 24 hours. After the reaction is finished, the mixture is firstly washed by deionized water for 3 times in a centrifugal mode, then washed by absolute ethyl alcohol for 3 times, and finally the centrifugal product is dried in a vacuum oven at 60 ℃ for 24 hours to obtain BN @ PDA.
(3) Preparing 0.5g of gelatin into a 5% aqueous solution by using deionized water, adding 0.5g of BN @ PDA, ultrasonically dispersing for 60min by using a cell crusher to obtain a BN @ PDA micron sheet/gelatin aqueous dispersion, pouring the aqueous dispersion into a mold, and placing the mold in a refrigerator to make the aqueous dispersion gel. And then taking out the gel, and volatilizing the water in the gel for 72h in the air atmosphere at room temperature to finally obtain the gelatin/BN @ PDA composite film with the BN @ PDA content of 50%.
Example 5
(1) 1g of BN was weighed into a beaker containing 250ml of deionized water and placed in a cell disruptor for ultrasonic dispersion for 4 hours.
(2) Adding 0.5g of dopamine into the BN dispersion solution in the step 1, adjusting the pH of the solution to 8.5 by using a Tri reagent, and carrying out magneton stirring reaction at 25 ℃ for 24 hours. After the reaction is finished, the mixture is firstly washed by deionized water for 3 times in a centrifugal mode, then washed by absolute ethyl alcohol for 3 times, and finally the centrifugal product is dried in a vacuum oven at 60 ℃ for 24 hours to obtain BN @ PDA.
(3) Preparing 0.7g of gelatin into a 5% aqueous solution by using deionized water, adding 0.3g of BN @ PDA, ultrasonically dispersing for 60min by using a cell crusher to obtain a BN @ PDA micron sheet/gelatin aqueous dispersion, pouring the aqueous dispersion into a mold, and placing the mold in a refrigerator to make the aqueous dispersion gel. And then taking out the gel, and volatilizing the water in the gel for 72 hours in the air atmosphere at room temperature to finally obtain the gelatin/BN @ PDA composite film with the BN @ PDA content of 70%.
Example 6
(1) 1g of BN was weighed into a beaker containing 250ml of deionized water and placed in a cell disruptor for ultrasonic dispersion for 4 hours.
(2) Adding 0.7g of dopamine into the BN dispersion solution in the step 1, adjusting the pH of the solution to 8.0 by using a Tri reagent, and carrying out magneton stirring reaction at 60 ℃ for 6 hours. After the reaction is finished, the mixture is firstly washed by deionized water for 3 times in a centrifugal mode, then washed by absolute ethyl alcohol for 3 times, and finally the centrifugal product is dried in a vacuum oven at 60 ℃ for 24 hours to obtain BN @ PDA.
(3) Preparing 0.3g of gelatin into a 5% aqueous solution by using deionized water, adding 0.7g of BN @ PDA, ultrasonically dispersing for 60min by using a cell crusher to obtain a BN @ PDA micron sheet/gelatin aqueous dispersion, pouring the aqueous dispersion into a mold, and placing the mold in a refrigerator to make the aqueous dispersion gel. And then taking out the gel, and volatilizing the water in the gel for 72 hours in the air atmosphere at room temperature to finally obtain the gelatin/BN @ PDA composite film with the BN @ PDA content of 70%.
Performance testing
And (3) carrying out performance test on the prepared material, wherein the test method comprises the following steps:
the heat conductivity coefficient is tested by a Netzsch LFA 467 laser heat conductivity instrument, and the mechanical property is tested by a universal tensile testing machine (CMT6103, SANS).
The test results are shown in table 1.
Table 1 results of performance testing
As can be seen from the above table, the heat-conducting gelatin composite film prepared by the preparation method provided by the invention has high heat conductivity coefficient and mechanical property. When the BN @ PDA content is 70%, the thermal conductivity coefficient is highest and can reach 12W/mK, meanwhile, higher mechanical property is maintained, and the tensile strength can reach 24.23 MPa.
The heat-conducting gelatin composite film provided by the invention has excellent performance in heat conductivity and mechanical property, can be applied to electronic equipment for heat conduction, and is particularly suitable for preparing flexible intelligent wearable electronic equipment.
In summary, the invention provides a heat-conducting gelatin composite film and a preparation method thereof. According to the invention, after the high-thermal-conductivity filler boron nitride is ultrasonically stripped, polydopamine is used for modifying the boron nitride, the modified boron nitride contains a large amount of hydroxyl groups, so that the hydrophilicity of the boron nitride is greatly improved, the boron nitride is mixed with a gelatin aqueous solution, the boron nitride/gelatin solution is ultrasonically stripped and dispersed into a multilayer boron nitride/gelatin solution, the boron nitride/gelatin solution is gelatinized at a low temperature, and finally, the heat-conductivity gelatin composite film with high flexibility, high mechanical property and high thermal conductivity is obtained through a gel dehydration film-forming process. The invention also provides a heat-conducting gelatin composite film which has excellent mechanical property and heat-conducting property and good application prospect.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. The preparation method of the heat-conducting gelatin composite film is characterized by comprising the following steps:
dispersing boron nitride in deionized water and performing ultrasonic dispersion treatment to prepare boron nitride micron-sheet dispersion liquid;
adding dopamine into the boron nitride micron sheet dispersion liquid and mixing to generate polydopamine on the surface of the boron nitride micron sheet to obtain a modified boron nitride micron sheet;
adding the modified boron nitride micron sheet into a gelatin water solution and carrying out ultrasonic dispersion treatment to obtain a composite dispersion liquid;
and preparing the composite dispersion liquid into gel, and dehydrating the gel to obtain the heat-conducting gelatin composite film.
2. The method of manufacturing a thermally conductive gelatin composite film as claimed in claim 1, wherein the boron nitride is hexagonal boron nitride.
3. The method for preparing a heat-conductive gelatin composite film as claimed in claim 1, wherein the step of adding dopamine into the boron nitride micron sheet dispersion liquid and mixing to generate polydopamine on the surface of the boron nitride micron sheet to obtain the modified boron nitride micron sheet comprises:
adding dopamine into the boron nitride micron-sheet dispersion liquid, and mixing and stirring to prepare a mixed solution;
adding a buffering agent into the mixed solution, stirring, adjusting the mixed solution to be alkaline, enabling dopamine to generate redox polymerization reaction in an alkaline environment, and generating polydopamine on the surface of the boron nitride micrometer piece to obtain the modified boron nitride micrometer piece.
4. The method for preparing the heat-conducting gelatin composite film according to claim 3, wherein the dopamine is subjected to redox polymerization reaction in an alkaline environment, and in the step of generating polydopamine on the surface of the boron nitride micron sheet, the reaction temperature is 20-60 ℃, and the reaction time is 6-24 h.
5. The method for preparing a thermally conductive gelatin composite film as claimed in claim 3, wherein the pH of the mixed solution is 8-10.
6. The method for preparing the heat-conducting gelatin composite film according to claim 3, wherein the mass ratio of the dopamine to the boron nitride nanosheets in the mixed solution is 1-2: 1.
7. the method for preparing a thermally conductive gelatin composite film according to claim 1, wherein the step of preparing the composite dispersion into a gel, and the step of preparing the thermally conductive gelatin composite film after dehydrating the gel comprises:
pouring the composite dispersion liquid into a mould, and preparing gel at 0-10 ℃ for later use;
and drying the gel at the temperature of 20-50 ℃ to remove water, thus obtaining the heat-conducting gelatin composite film.
8. The method of claim 1, wherein the heat conductive gelatin composite film comprises 10-80% modified boron nitride micro-sheets by weight.
9. The method for preparing the heat-conductive gelatin composite film according to claim 1, wherein the step of dispersing boron nitride in deionized water and performing ultrasonic dispersion treatment to obtain the boron nitride nanosheet dispersion comprises:
mixing boron nitride and deionized water according to the mass ratio of 1:200-300, and carrying out ultrasonic treatment for 2-4h to strip the boron nitride, thereby preparing the boron nitride micron-sheet dispersion liquid.
10. A heat-conductive gelatin composite film, characterized by being produced by the production method according to any one of claims 1 to 9.
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Cited By (4)
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| CN112064018A (en) * | 2020-07-29 | 2020-12-11 | 深圳大学 | Room-temperature liquid metal film and preparation method thereof |
| CN112609465A (en) * | 2020-12-26 | 2021-04-06 | 福州大学 | High-thermal-conductivity infiltration material for photo-thermal conversion and preparation method thereof |
| CN113754920A (en) * | 2021-09-30 | 2021-12-07 | 合肥学院 | Polyimide composite aerogel, preparation method and application of polyimide composite aerogel as solar evaporator |
| CN113801379A (en) * | 2021-09-16 | 2021-12-17 | 中国科学院工程热物理研究所 | Bacterial cellulose/boron nitride composite high-thermal-conductivity flexible film material and preparation method thereof |
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| CN107541033A (en) * | 2017-08-30 | 2018-01-05 | 华南理工大学 | A kind of high gas-obstructing character nano composite material and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112064018A (en) * | 2020-07-29 | 2020-12-11 | 深圳大学 | Room-temperature liquid metal film and preparation method thereof |
| CN112609465A (en) * | 2020-12-26 | 2021-04-06 | 福州大学 | High-thermal-conductivity infiltration material for photo-thermal conversion and preparation method thereof |
| CN112609465B (en) * | 2020-12-26 | 2022-04-12 | 福州大学 | High-thermal-conductivity infiltration material for photo-thermal conversion and preparation method thereof |
| CN113801379A (en) * | 2021-09-16 | 2021-12-17 | 中国科学院工程热物理研究所 | Bacterial cellulose/boron nitride composite high-thermal-conductivity flexible film material and preparation method thereof |
| CN113754920A (en) * | 2021-09-30 | 2021-12-07 | 合肥学院 | Polyimide composite aerogel, preparation method and application of polyimide composite aerogel as solar evaporator |
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