CN118562301B - A fireproof heat dissipation insulating sheet and preparation method thereof - Google Patents
A fireproof heat dissipation insulating sheet and preparation method thereof Download PDFInfo
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Abstract
The application relates to the technical field of fireproof heat-insulating sheets, in particular to a fireproof heat-dissipating insulating sheet and a preparation method thereof, wherein the fireproof heat-dissipating insulating sheet is prepared from the following raw materials, by weight, 100 parts of vinyl silicone oil, 5-15 parts of hydrogen-containing silicone oil, 20-30 parts of methyl vinyl silicone resin, 40-60 parts of heat-conducting filler, 6-12 parts of flame retardant, 1-2 parts of catalyst and 1-2 parts of vulcanizing agent, each part of heat-conducting filler is prepared by mixing boron nitride, silicon carbide and dispersing agent according to the weight ratio of (10-15) to (5-10) to 3, and the fireproof heat-dissipating insulating sheet prepared by the formula has good insulating heat conductivity and flexibility, the heat conductivity coefficient can reach more than 9.0W/mK, and meanwhile, the heat-dissipating insulating sheet also has good fireproof performance, can be bent at will and has a wide application range.
Description
Technical Field
The application relates to the technical field of fireproof heat-insulating sheets, in particular to a fireproof heat-dissipating insulating sheet and a preparation method thereof.
Background
The new energy battery is generally formed by adopting a plurality of unit battery packs, and each battery pack is connected in a serial connection or/and cross-linking mode. The two adjacent battery units are generally separated by the insulating radiating fin, so that short circuits among the battery units are avoided, and the use safety performance of the new energy battery is improved.
The traditional insulating radiating fins comprise rubber insulating radiating fins, heat conducting silica gel insulating radiating fins and ceramic insulating radiating fins. The heat-conducting silica gel insulating radiating fin has good insulating heat-conducting property, can fill gaps among the battery units, has a certain damping effect, and is more convenient to use than the rubber insulating radiating fin and the ceramic insulating radiating fin.
However, as the battery technology is continuously innovated and improved, the energy density of the battery is continuously increased, the volume of the battery is continuously reduced, the shape is changeable, the running power of the battery is larger, the heat emitted in the use process is higher, and the generated voltage is also higher. The heat conductivity coefficient of the heat conducting silica gel insulating radiating fin is generally 1.0-5.0W/mK, the heat conducting property of the heat conducting silica gel insulating radiating fin can not meet the use requirement of the existing battery, and meanwhile, the use amount of the existing heat conducting silica gel insulating radiating fin is generally more than 60% due to the addition of a large amount of heat conducting filler, so that the flexibility of the heat conducting silica gel insulating radiating fin is greatly reduced, and the deformation phenomenon is easy to occur in the use process, so that the heat conducting silica gel insulating radiating fin needs to be improved.
Disclosure of Invention
The application provides a fireproof heat-dissipation insulating sheet and a preparation method thereof in order to improve the heat-conduction performance of heat-conduction silica gel insulation heat dissipation.
The fireproof heat-dissipating insulating sheet is called as a heat-dissipating insulating sheet for short in the application.
In a first aspect, the present application provides a fireproof heat dissipation insulating sheet, which adopts the following technical scheme:
The fireproof heat-dissipation insulating sheet is prepared from the following raw materials in parts by weight:
100 parts of vinyl silicone oil
5-15 Parts of hydrogen-containing silicone oil
20-30 Parts of methyl vinyl silicone resin
40-60 Parts of heat conducting filler
6-12 Parts of flame retardant
1-2 Parts of catalyst
1-2 Parts of vulcanizing agent
The heat conducting filler is prepared by mixing 10-15 parts by weight of boron nitride, 5-10 parts by weight of silicon carbide and 3 parts by weight of dispersing agent.
By adopting the technical scheme, the prepared heat-dissipation insulating sheet has good insulating heat conductivity and flexibility, the heat conductivity coefficient can reach more than 9.0W/mK, and meanwhile, the heat-dissipation insulating sheet also has good fireproof performance and flexibility, and can be bent at will to be suitable for batteries with various shapes.
According to the application, the boron nitride, the silicon carbide and the dispersing agent are mixed according to a specific proportion, so that the heat conduction efficiency of the fireproof heat dissipation insulating sheet is further improved, and the use amount of heat conduction powder is reduced. The boron nitride has good heat conduction performance, can greatly improve the heat conduction performance of the heat dissipation insulating sheet, but the single use of the silicon nitride can increase the viscosity of the heat dissipation insulating sheet, meanwhile, the brittleness of the boron nitride is large, the boron nitride is easy to spall in the use process, and the flexibility of the heat dissipation insulating sheet can be influenced, the heat dissipation insulating sheet is used by being attached to a battery, and the existing battery has various shapes, such as a cylinder, a square and a soft package battery, so that the insulating heat dissipation sheet needs to be bent in the use process, the stress effect at the bent part is large, and the boron nitride is easy to spall. The silicon carbide has better toughness, and can be used together with the boron nitride, so that the consumption of the boron nitride can be reduced, the toughness of the heat dissipation insulating sheet can be improved, and meanwhile, the silicon carbide has good heat conductivity and insulating property, and the heat conductivity and the insulating property of the heat dissipation insulating sheet can be improved. The dispersing agent enables boron nitride and silicon carbide to be better dispersed in the system, and uniformity and stability of the heat dissipation insulating sheet are improved.
Under the action of a catalyst, the methyl vinyl silicone resin and the-SiH hydrogen silicone oil undergo a hydrosilylation reaction, the vinyl silicone oil and the-SiH hydrogen silicone oil undergo a hydrosilylation reaction, the methyl vinyl silicone resin and the vinyl silicone oil with a specific structure undergo a hydrosilylation reaction to form main chains with different lengths and different structures, and the main chains are intertwined with each other, so that a stable three-dimensional reticular structure is formed, the flexibility of the heat-dissipating insulating sheet is improved, and the network structure is not easy to damage in the use process. The consumption of the heat-conducting filler is lower than 50% of the total weight, and the heat-conducting filler is uniformly distributed in the three-dimensional network structure to build up the heat-conducting network structure, so that the heat conductivity coefficient is improved, and the heat dissipation efficiency is further improved. The flame retardant performance of the heat dissipation insulating sheet is further improved by adding the flame retardant. The vulcanizing agent promotes vulcanization molding of the insulating radiating fin, and improves the flexibility, the heat conductivity, the insulativity and other performances of the insulating radiating fin.
Preferably, the boron nitride is modified boron nitride, and is prepared by the following preparation method:
putting boron nitride into an organic solvent, adding a coupling agent after uniformly dispersing, stirring for reaction, and centrifugally washing after the reaction is finished to obtain surface modified boron nitride;
Adding surface modified boron nitride into a mixed solution of ethanol and water, performing ultrasonic treatment to uniformly disperse the surface modified boron nitride to form an emulsion, adding an emulsifying agent and a buffering agent into the emulsion, and performing ultrasonic dispersion to uniformly obtain a mixed solution;
Mixing the mixed solution with vinyl acrylic acid, heating and refluxing at 50-60 ℃ under the protection of nitrogen, pre-emulsifying, heating to 85-90 ℃, dropwise adding an aqueous solution containing an initiator, keeping constant temperature and stirring at a constant speed for reacting for 7-9 hours to obtain a primary product, centrifugally washing the primary product, and drying in vacuum to obtain the modified boron nitride.
By adopting the technical scheme, the ethylene acrylic acid high molecular polymer is connected to the surface of the boron nitride, so that the brittleness of the boron nitride is greatly reduced under the action of the high molecular polymer, and the flexibility and the heat conductivity of the heat dissipation insulating sheet are further improved. In the application, the coupling agent is used for carrying out surface modification on the boron nitride, which is beneficial to the surface graft copolymer of the boron nitride. And then, emulsion polymerization coating is carried out by using vinyl acrylic acid to obtain vinyl acrylic acid polymer coated boron nitride, so that the surface of the boron nitride is provided with a protective layer, the possibility of easy spalling of the boron nitride in the use process can be reduced, the integrity of the boron nitride structure is maintained, and the thermal conductivity of the insulating radiating fin is further maintained. Meanwhile, the vinyl acrylic acid polymer has the coating effect, so that the surface softness of the boron nitride is greatly reduced, the flexibility of the insulating radiating fin is further improved, meanwhile, the bonding force of the boron nitride and the three-dimensional network structure can be further improved by the vinyl acrylic acid polymer, the structural stability of the radiating insulating fin is improved, and the service life of the radiating insulating fin is prolonged.
Preferably, the raw materials used for preparing the modified boron nitride are as follows in parts by weight:
20-30 parts of boron nitride
50-70 Parts of organic solvent
2.5 To 3.5 portions of coupling agent
Ethanol 8-18 parts
10-20 Parts of water
4-5 Parts of emulsifying agent
Buffer 4-5 parts
Vinyl acrylic acid 5-9 parts
6-10 Parts of an aqueous solution containing an initiator.
By adopting the technical scheme, the weight of raw materials used for preparing the modified boron nitride is optimized, the combination efficiency of the boron nitride and the vinyl acrylic polymer is further improved, the possibility of boron nitride spalling is greatly reduced, the flexibility of the insulating radiating fin is further improved, the acting force at the bending part is buffered, and the service life of the radiating insulating fin is prolonged.
Preferably, the vinyl silicone oil has the following structural formula:
By adopting the technical scheme, the ethylene content in the vinyl silicone oil is improved, the three-dimensional network crosslinking density is improved, and the flexibility, the insulativity and the heat dissipation of the heat dissipation insulating sheet are further improved.
Preferably, n=50 to 150 and m=60 to 200 in the vinyl silicone oil.
Through adopting above-mentioned technical scheme, optimize n, m's value for vinyl content is moderate in the vinyl silicone oil, is favorable to forming the heat dissipation insulating piece that flexibility is good with methyl vinyl silicone resin, hydrogen silicone oil crosslinking, can also improve flexibility, insulativity and the thermal diffusivity of heat dissipation insulating piece simultaneously. The vinyl silicone oil has higher vinyl content, too many crosslinking points of the space network structure after crosslinking, so that the heat-dissipating insulating sheet has too high hardness after heating and curing, and the vinyl silicone oil has less vinyl content, and the crosslinking points of the space network structure after crosslinking are too few, so that the strength, the insulativity and the heat-dissipating property of the heat-dissipating insulating sheet are reduced.
Preferably, the average particle diameter of the boron nitride is 30-100nm, and the average particle diameter of the silicon carbide is 100-500nm.
By adopting the technical scheme, the grading of the boron nitride and the silicon carbide is further optimized, the heat conductivity coefficient of the composition can be obviously improved, and the spalling condition of the boron nitride in the use process is reduced.
Preferably, the ethylene content in the methyl vinyl silicone resin is 0.1-0.5mol/100g, and the molecular weight is 10-40 ten thousand.
By adopting the technical scheme, the parameters of the methyl vinyl silicone resin are optimized, the efficiency of hydrosilylation reaction between the methyl vinyl silicone resin and the SiH hydrogen-containing silicone oil is improved, the formation of a three-dimensional network is promoted, and the flexibility, insulativity and thermal conductivity of the radiating insulating sheet are improved.
Preferably, the viscosity of the hydrogen-containing silicone oil at 25 ℃ is 1000-5000mpa.s, and the hydrogen content is 0.1-0.4%.
By adopting the technical scheme, the viscosity and the hydrogen content of the hydrogen-containing silicone oil are optimized, the reaction efficiency of the hydrosilylation reaction of the methyl vinyl silicone resin and the SiH hydrogen-containing silicone oil and the reaction efficiency of the hydrosilylation reaction of the vinyl silicone oil and the SiH hydrogen-containing silicone oil are further improved, the crosslinking density is improved, and the flexibility, the insulativity and the thermal conductivity of the radiating insulating sheet are further greatly improved.
Preferably, the flame retardant includes at least one of magnesium hydroxide, ammonium polyphosphate, decabromodiphenyl ether, silicone flame retardant, antimony trioxide and aluminum hydroxide. The flame retardant has good flame retardant effect, and the fireproof performance of the heat-dissipating insulating sheet can be further improved by using the flame retardant.
In a second aspect, the application provides a preparation method of a fireproof heat-dissipation insulating sheet for a new energy battery pack, which adopts the following technical scheme:
the preparation method of the fireproof heat-dissipation insulating sheet for the new energy battery pack comprises the following preparation steps:
s1, mixing vinyl silicone oil, hydrogen-containing silicone oil, methyl vinyl silicone resin, a flame retardant and a catalyst according to parts by weight to obtain a mixture A, wherein the mixing temperature is 40-50 ℃, the mixing time is 40-60min, and the mixing speed is 800-1000r/min;
S2, mixing the mixture A, the heat-conducting filler and the vulcanizing agent to obtain a mixture B, wherein the mixing temperature is 40-50 ℃, the mixing time is 20-30min, and the mixing speed is 1000-1200r/min to obtain a mixture B;
S3, carrying out vacuum defoamation on the mixture B for 20-30min under the vacuum pressure of 0.2-0.4KPa to form heat-conducting silica gel, and S4, heating the heat-conducting silica gel to 80-100 ℃ for primary vulcanization for 3-6min, then heating the heat-conducting silica gel to 110-120 ℃ for secondary vulcanization for 2-4min, and cutting after cooling to obtain the fireproof heat-dissipating insulating sheet.
By adopting the technical scheme, the fireproof heat-dissipation insulating sheet has good insulation heat conductivity, the heat conductivity coefficient can reach more than 9.0W/mK, and meanwhile, the heat-dissipation insulating sheet also has good fireproof performance.
In summary, the application has the following beneficial effects:
1. According to the application, the fireproof heat-dissipation insulating sheet is prepared by mixing vinyl silicone oil, hydrogen-containing silicone oil, methyl vinyl silicone resin, heat-conducting filler, flame retardant, catalyst and vulcanizing agent according to a specific proportion, wherein the heat-conducting filler is prepared by mixing boron nitride, silicon carbide and dispersing agent according to a specific proportion, the heat-conducting property and flexibility of the heat-dissipation insulating sheet are improved by the specific heat-conducting filler, the addition amount of the heat-conducting filler is reduced, and meanwhile, the vinyl silicone oil, the hydrogen-containing silicone oil and the methyl vinyl silicone resin are crosslinked, so that the flexibility and the insulativity of the heat-dissipation insulating sheet are greatly improved, the heat-dissipation insulating sheet can be bent at will for use, and good heat conductivity and insulativity can still be kept.
2. According to the application, the surface of the boron nitride is combined with the vinyl acrylic polymer by modifying the boron nitride, so that the boron nitride cannot be spalled in the use process, the heat conductivity of the heat-radiating insulating sheet is ensured, the binding force of the boron nitride and the three-dimensional network structure is improved, the structural stability of the heat-radiating insulating sheet is improved, and the service life of the heat-radiating insulating sheet is prolonged.
Detailed Description
Examples
Example 1
A fireproof heat dissipation insulating sheet is prepared by the following method:
S1, mixing 1000g of vinyl silicone oil, 50g of hydrogen-containing silicone oil, 200g of methyl vinyl silicone resin, 60g of flame retardant (decabromodiphenyl ether) and 10g of catalyst (chloroplatinic acid) to obtain a mixture A, wherein the mixing temperature is 40 ℃, the mixing time is 40min, and the mixing speed is 800r/min;
s2, mixing the mixture A, 400g (boron nitride) of heat conducting filler and 10g (sulfur) of vulcanizing agent to obtain a mixture B, wherein the mixing temperature is 40 ℃, the mixing time is 20min, and the mixing speed is 1000r/min to obtain a mixture B;
s3, carrying out vacuum defoamation on the mixture B for 20min, wherein the vacuum pressure is 0.2KPa, so as to form heat-conducting silica gel;
and S4, heating the heat-conducting silica gel to 80 ℃ for primary vulcanization for 3min, then heating to 110 ℃ for secondary vulcanization for 2min, and cutting after cooling to obtain the fireproof heat-dissipating insulating sheet.
The structural formula of the vinyl silicone oil is as follows:
n=50,m=200
the viscosity of the hydrogen-containing silicone oil at 25 ℃ is 1000mpa.s, and the hydrogen content is 0.1%.
The ethylene content of the methyl vinyl silicone resin was 0.1mol/100g and the molecular weight was 10 ten thousand.
The heat conducting filler is obtained by mixing 222g (with the average particle size of 30 nm), 111g (with the average particle size of 100 nm) of silicon carbide and 67g (sodium pyrophosphate) of dispersing agent according to the weight ratio of 10:5:3.
Examples 2-3 differ from example 1 in the type, amount and parameters of the partial raw materials used to prepare the fireproof heat-dissipating insulating sheet, and the specific differences are shown in table 1:
TABLE 1 raw material types, amounts and parameters for preparing fireproof Heat-dissipating insulating sheets
The heat conductive filler in example 2 was obtained by mixing 273g of boron nitride (average particle diameter: 80 nm), 159g of silicon carbide (average particle diameter: 300 nm) and 68g of dispersant (sodium tripolyphosphate) in a weight ratio of 12:7:3.
The heat conductive filler in example 3 was obtained by mixing 321g of boron nitride (average particle diameter: 100 nm), 214g of silicon carbide (average particle diameter: 500 nm) and 64g of dispersant (sodium hexametaphosphate) in a weight ratio of 15:10:3.
Example 4
The fireproof heat dissipation insulating sheet in this embodiment is different from that in embodiment 1 in that n=50, m=50, and the types, the amounts and the experimental parameters of the rest of the raw materials are the same as those in embodiment 1.
Example 5
The fireproof heat dissipation insulating sheet in this embodiment is different from that in embodiment 1 in that n=50, m=210, and the types, the amounts and the experimental parameters of the rest raw materials are the same as those in embodiment 1.
Example 6
The fireproof heat dissipation insulating sheet in this embodiment is different from that in embodiment 1 in that n=60, m=50, and the types, the amounts and the experimental parameters of the rest of the raw materials are the same as those in embodiment 1.
Example 7
The fireproof heat dissipation insulating sheet in this embodiment is different from that in embodiment 1 in that n=40, m=50, and the types, the amounts and the experimental parameters of the rest of the raw materials are the same as those in embodiment 1.
Example 8
The difference between the fireproof heat dissipation insulating sheet and the embodiment 1 is that the boron nitride is modified boron nitride, and the fireproof heat dissipation insulating sheet is prepared by the following preparation method:
Putting 250g of boron nitride into 500g of organic solvent (tetrahydrofuran), uniformly dispersing, adding 25g of coupling agent (gamma-methacryloxypropyl trimethoxy silane), stirring for reaction, and centrifugally washing after the reaction is finished to obtain surface modified boron nitride;
Adding surface modified boron nitride into a mixed solution of 80g of ethanol and 100g of water, then carrying out ultrasonic treatment to uniformly disperse the surface modified boron nitride to form emulsion, adding 30g of emulsifying agent (peregal-10) and 30g of buffer (sodium bicarbonate) into the emulsion, and then carrying out ultrasonic dispersion to uniformly obtain a mixed solution;
mixing the mixed solution with 50g of vinyl acrylic acid, heating and refluxing under the protection of nitrogen at 50 ℃, pre-emulsifying, heating to 85 ℃, dropwise adding 60g of aqueous solution containing an initiator, keeping constant temperature and stirring at a constant speed for reaction for 7h to obtain a primary product, centrifugally washing the primary product, and drying in vacuum to obtain the modified boron nitride.
The aqueous solution containing the initiator is ammonium persulfate aqueous solution, and the mass fraction is 10%.
Examples 9-10 differ from example 8 in the type, amount and parameters of the partial raw materials used to prepare the modified boron nitride, as shown in Table 2:
TABLE 2 raw material types, amounts and parameters for preparing modified boron nitride
Example 11
The difference between the fireproof heat dissipation insulating sheet and the embodiment 1 is that the structural formula of vinyl silicone oil is as follows:
n=50。
comparative example
Comparative example 1
The difference between the fireproof heat dissipation insulating sheet and the embodiment 1 is that the heat conduction filler is boron nitride, and the types, the amounts and the experimental parameters of the rest raw materials are the same as those of the embodiment 1.
Comparative example 2
The difference between the fireproof heat dissipation insulating sheet and the embodiment 1 is that the heat conduction filler is all silicon carbide, and the types, the amounts and the experimental parameters of the rest raw materials are the same as those of the embodiment 1.
Comparative example 3
The comparative example is different from example 1 in that the methyl vinyl silicone resin is replaced by the same amount of methyl phenyl silicone resin, and the types, the amounts and the experimental parameters of the rest raw materials are the same as those of example 1.
The molecular weight of the methyl phenyl silicone resin is 10 ten thousand, and the phenyl content is 20%.
Performance test
Radial thermal conductivity test, insulation performance test and bending performance test of the fireproof heat dissipation insulating sheets were prepared in examples 1 to 11 and comparative examples 1 to 3.
Detection method/test method
Thermal conductivity coefficient according to national standard GB/T2588-2008 test, using NETZSCH HY 009 thermal conductivity tester to test thermal conductivity coefficient at 25deg.C;
The insulation performance test is carried out according to GB/1410-2006, the volume resistance is detected by adopting a volume surface resistivity tester LST-121, when the volume resistance is tested, current flows from the heat conduction layer of the radiating fin to the heat conduction insulating layer, the larger the resistance is, the better the insulation performance is, and the bending performance test is that the fireproof radiating insulating fin prepared by the embodiment 1-11 and the comparative embodiment 1-3 is repeatedly bent for 5000 times, the bending angle is 90 degrees, and the smaller the change rate of the heat conduction coefficient and the change rate of the resistance are, the better the bending performance and the better the flexibility of the radiating insulating fin are. The test data are shown in table 3:
TABLE 3 Experimental data for examples 1-11 and comparative examples 1-3
From comparison of example 1 and comparative example 1, it can be seen that the thermal conductivity and insulation properties of the heat-dissipating insulation sheet can be improved by using boron nitride alone as the thermal conductive filler, but after the bending property test, the thermal conductivity and electrical resistance in comparative example 1 are greatly reduced, indicating that the use of boron nitride alone as the thermal conductive filler is disadvantageous for improving the flexibility of the heat-dissipating insulation sheet.
From the comparison of example 1 with comparative example 2, it can be seen that by using silicon carbide alone as the heat conductive filler, both the heat conductivity and the electric resistance are reduced, and after the bending property test, both the heat conductivity and the electric resistance are reduced, indicating that the use of boron nitride and silicon carbide together can further improve the flexibility, the heat conductivity and the insulation property of the heat dissipation insulating sheet.
Compared with the comparative example 3, the heat conductivity and the electric resistance in the comparative example 3 are not the same as those in the example 1, and after the bending performance test, the heat conductivity and the electric resistance are greatly reduced, which shows that the heat dissipation insulating sheet can be further improved in flexibility and keep good heat conductivity and insulativity by adding the methyl vinyl silicone resin to be used together with other components in the application.
Compared with examples 8-10, the heat conductivity and the electric resistance of examples 8-10 are increased, and the change rate of the heat conductivity and the change rate of the electric resistance of examples 8-10 are smaller than those of example 1 after repeated bending, which shows that the modified boron nitride prepared by the application can further improve the flexibility, the heat conductivity and the insulativity of the heat dissipation insulating sheet.
Compared with the embodiment 4-7, the embodiment 1 is repeatedly bent, the embodiment 4-5 has smaller heat conductivity coefficient change rate and electric resistance change rate than the embodiment 1, the embodiment 6-7 has smaller heat conductivity coefficient and electric resistance change rate, and the embodiment 6-7 has smaller heat conductivity coefficient change rate and electric resistance change rate than the embodiment 1, so that the flexibility, heat conductivity and insulativity of the heat dissipation insulating sheet can be further improved by optimizing the values of n and m in vinyl silicone oil.
Compared with example 1 and example 11, the heat conductivity and the electric resistance in example 11 are both reduced, and the change rate of the heat conductivity and the change rate of the electric resistance in example 11 are both smaller than those in example 1 after repeated bending, which shows that the flexibility, the heat conductivity and the insulativity of the heat dissipation insulating sheet can be further improved by using vinyl silicone oil with a specific structure to be used together with other raw materials to prepare the heat dissipation insulating sheet.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (3)
1. The fireproof heat-dissipation insulating sheet is characterized by being prepared from the following raw materials in parts by weight:
100 parts of vinyl silicone oil
5-15 Parts of hydrogen-containing silicone oil
20-30 Parts of methyl vinyl silicone resin
40-60 Parts of heat conducting filler
6-12 Parts of flame retardant
1-2 Parts of catalyst
1-2 Parts of vulcanizing agent
The heat conducting filler is prepared by mixing (10-15) boron nitride, silicon carbide and a dispersing agent (5-10) 3 in parts by weight, wherein the boron nitride is modified boron nitride and is prepared by the following preparation method:
putting boron nitride into an organic solvent, adding a coupling agent after uniformly dispersing, stirring for reaction, and centrifugally washing after the reaction is finished to obtain surface modified boron nitride;
Adding surface modified boron nitride into a mixed solution of ethanol and water, performing ultrasonic treatment to uniformly disperse the surface modified boron nitride to form an emulsion, adding an emulsifying agent and a buffering agent into the emulsion, and performing ultrasonic dispersion to uniformly obtain a mixed solution;
Mixing the mixed solution with vinyl acrylic acid, heating and refluxing at 50-60 ℃ under the protection of nitrogen, pre-emulsifying, heating to 85-90 ℃, dropwise adding an aqueous solution containing an initiator, keeping constant temperature and stirring at a constant speed for reacting for 7-9 hours to obtain a primary product, centrifugally washing the primary product, and vacuum drying to obtain modified boron nitride;
the raw materials used for preparing the modified boron nitride are shown in the following parts by weight:
20-30 parts of boron nitride
50-70 Parts of organic solvent
2.5 To 3.5 portions of coupling agent
Ethanol 8-18 parts
10-20 Parts of water
4-5 Parts of emulsifying agent
Buffer 4-5 parts
Vinyl acrylic acid 5-9 parts
6-10 Parts of an aqueous solution containing an initiator;
the average grain diameter of the boron nitride is 30-100nm, and the average grain diameter of the silicon carbide is 100-500nm;
The ethylene content in the methyl vinyl silicone resin is 0.1-0.5mol/100g, and the molecular weight is 10-40 ten thousand;
the viscosity of the hydrogen-containing silicone oil at 25 ℃ is 1000-5000 mPas, and the hydrogen content is 0.1-0.4%.
2. A fire resistant heat dissipating insulation sheet as set forth in claim 1 wherein said flame retardant comprises at least one of magnesium hydroxide, ammonium polyphosphate, decabromodiphenyl ether, silicone flame retardant, ammonium polyphosphate and montmorillonite nanocomposite, antimony trioxide and aluminum hydroxide.
3. A method for producing a fireproof heat-dissipating insulating sheet according to any one of claims 1 to 2, comprising the steps of:
s1, mixing vinyl silicone oil, hydrogen-containing silicone oil, methyl vinyl silicone resin, a flame retardant and a catalyst according to parts by weight to obtain a mixture A, wherein the mixing temperature is 40-50 ℃, the mixing time is 40-60min, and the mixing speed is 800-1000r/min;
S2, mixing the mixture A, the heat-conducting filler and the vulcanizing agent, wherein the mixing temperature is 40-50 ℃, the mixing time is 20-30min, and the mixing speed is 1000-1200r/min, so as to obtain a mixture B;
S3, carrying out vacuum defoamation on the mixture B for 20-30min, wherein the vacuum pressure is 0.2-0.4KPa, so as to form heat-conducting silica gel;
S4, heating the heat-conducting silica gel to 80-100 ℃ for primary vulcanization for 3-6min, then heating to 110-120 ℃ for secondary vulcanization for 2-4min, cooling and cutting to obtain the fireproof heat-dissipating insulating sheet.
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| CN111484626A (en) * | 2020-04-24 | 2020-08-04 | 叶笃梁 | Modified boron nitride grafted waterborne acrylic resin insulating material and preparation method thereof |
| CN113527893A (en) * | 2021-08-13 | 2021-10-22 | 深圳先进电子材料国际创新研究院 | High-hysteresis thermal interface material and preparation method and application thereof |
| CN117645795A (en) * | 2024-01-30 | 2024-03-05 | 北京泰派斯特电子技术有限公司 | Elastomer composition, high-elasticity heat-conducting insulating gasket and preparation method thereof |
| CN117844255A (en) * | 2018-09-30 | 2024-04-09 | 深圳市森日有机硅材料股份有限公司 | Silica gel sheet and preparation method and application thereof |
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| JP6497291B2 (en) * | 2015-10-14 | 2019-04-10 | 信越化学工業株式会社 | Insulating heat dissipation sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117844255A (en) * | 2018-09-30 | 2024-04-09 | 深圳市森日有机硅材料股份有限公司 | Silica gel sheet and preparation method and application thereof |
| CN111484626A (en) * | 2020-04-24 | 2020-08-04 | 叶笃梁 | Modified boron nitride grafted waterborne acrylic resin insulating material and preparation method thereof |
| CN113527893A (en) * | 2021-08-13 | 2021-10-22 | 深圳先进电子材料国际创新研究院 | High-hysteresis thermal interface material and preparation method and application thereof |
| CN117645795A (en) * | 2024-01-30 | 2024-03-05 | 北京泰派斯特电子技术有限公司 | Elastomer composition, high-elasticity heat-conducting insulating gasket and preparation method thereof |
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