CN112920606A - High-thermal-conductivity insulating silicone grease and preparation method thereof - Google Patents
High-thermal-conductivity insulating silicone grease and preparation method thereof Download PDFInfo
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Abstract
The invention relates to high-thermal-conductivity insulating silicone grease which comprises the following raw materials in parts by mass: 100 parts of basic silicone oil, 10-20 parts of modified silicone oil, 500-1500 parts of heat-conducting filler, 10-20 parts of modifier and 30-40 parts of assistant; wherein, the heat conduction filler is compounded by at least two heat conduction powders with different grain diameters in a grading way. The invention also provides a preparation method of the high-thermal-conductivity insulating silicone grease. The high-thermal-conductivity insulating silicone grease disclosed by the invention has the advantages of high thermal conductivity coefficient, good insulativity and low oil yield, and the use reliability of the high-thermal-conductivity silicone grease can be effectively improved.
Description
Technical Field
The invention relates to the technical field of heat conduction and heat dissipation, in particular to high-heat-conductivity insulating silicone grease and a preparation method thereof.
Background
Along with the development of industrial production and scientific technology, electronic products tend to be densified, miniaturized and high-density, the integration level on a circuit board is higher and higher, and heat-conducting silicone grease is required to be used as a thermal interface material with excellent performance along with the heat dissipation requirement, so that the silicone grease is widely applied to the electronic products.
At present, the heat conductivity coefficient of the heat-conducting silicone grease in the domestic market is generally low, the performance is unstable, oil and powder are often separated in the using process, the heat-conducting and heat-dissipating performance is greatly reduced, and the service life of devices is seriously influenced. Along with the development of miniaturization and performance gradual promotion of equipment, the requirement on heat conduction and heat dissipation is higher and higher, so in order to meet the high heat conduction requirement of the market, the heat conduction silicone grease with high heat conduction and insulation has great practical significance for heat dissipation and heat transfer application in the high-tech electronic information era.
Disclosure of Invention
The heat-conducting silicone grease has high heat conductivity coefficient and strong heat transfer capacity, can improve the reliability and prolong the service life of electronic products, and has simple preparation process.
The high-thermal-conductivity insulating silicone grease comprises the following components in parts by weight: 100 parts of basic silicone oil, 10-20 parts of modified silicone oil, 500-1500 parts of heat-conducting filler, 10-20 parts of modifier and 30-40 parts of assistant.
In one embodiment, the thermally conductive filler is a mixture of fillers having a first particle size and a second particle size, and the first particle size is larger than the second particle size.
In one embodiment, the first particle size is 5 to 10 μm and the second particle size is 1 to 5 μm.
In one embodiment, the thermally conductive filler is selected from one or more of aluminum nitride, zinc oxide, boron nitride, and silicon nitride.
In one embodiment, the base silicone oil is a linear organopolysiloxane comprising at least one of methyl silicone oil, methyl vinyl silicone oil, and methyl phenyl silicone oil, and has a viscosity of 150 to 500mPa · s at 25 ℃.
In one embodiment, the linear organopolysiloxane is a blend of one or more of methyl terminated and methyl vinyl terminated polyorganosiloxanes.
In one embodiment, the high thermal conductivity silicone grease further comprises 50-200 parts of thermal conductivity enhancing particles, wherein the thermal conductivity enhancing particles refer to one or more of micron-sized aluminum powder, nano silver powder and nano graphene.
In one embodiment, the surface of the nano silver powder is modified by amino; the preparation method of the nano silver powder comprises the following steps: preparing aqueous solution of silver nitrate with the concentration of 0.05-0.1wt% and ethylenediamine with the concentration of 1-2wt%, and adding the aqueous solution with the target concentration of 0 under the ice bath condition1-0.2wt% NaBH4And carrying out reduction reaction, centrifugally separating reaction products, washing with deionized water, and drying under reduced pressure to obtain the amino modified nano silver.
In one embodiment, the modified silicone oil is a long-chain alkyl modified silicone oil or a carboxyl modified silicone oil, and has a viscosity of 50 to 200 mPas at 25 ℃.
In one embodiment, the carboxyl-modified silicone oil is prepared as follows:
step 1, mixing 20-30 parts of 3-heptenoic acid and 30-45 parts of a first organic solvent in a nitrogen atmosphere according to parts by weight, adding an organic platinum catalyst, dropwise adding 12-15 parts of methyl dichlorosilane, and heating for reaction; after the reaction is finished, decompressing and removing the solvent to obtain carboxyl modified silane;
step 2, dropwise adding 30-45 parts of carboxyl modified silane and 35-50 parts of dimethyldichlorosilane into 50-70 parts of deionized water by weight, heating to perform hydrolysis reaction, keeping the temperature continuously after the reaction is finished, adding a second organic solvent after the reaction is finished, washing the product until the pH is neutral, standing for layering, removing a water phase, and removing the solvent by organic phase decompression to obtain a carboxyl modified condensation compound;
and 3, performing end-capping reaction on 120 parts by weight of carboxyl modified condensation compound 100, 12-15 parts by weight of hexamethyldisiloxane and 3-5 parts by weight of concentrated sulfuric acid in a nitrogen atmosphere, adding a second organic solvent into a reaction product, washing the product until the pH value is neutral, standing for layering, removing a water phase, performing vacuum distillation on the organic phase, and taking low-boiling-point substances to obtain the carboxyl modified silicone oil.
In one embodiment, in the step 1, the temperature-rising reaction is carried out at 70-85 ℃ for 2-5h, and the organic solvent is toluene or xylene.
In one embodiment, in the step 2, the temperature-rising reaction refers to a reaction at 40-60 ℃ and the holding time is 1-3 h; the second organic solvent is ethyl acetate.
In one embodiment, the end-capping reaction in step 3 is carried out at 70-85 ℃ for 6-10h, and the low-boiling point substance is a fraction at 108-112 ℃ under the absolute pressure of 1000-2000 Pa.
In one embodiment, the modifier is an organosilane containing a hydrophilic group.
In one embodiment, the hydrophilic group is selected from methoxy or methoxyethoxy groups.
In one embodiment, the modifier is at least one of gamma- (methacryloyloxy) propyltrimethoxysilane, dodecyltrimethoxysilane, and vinyltris (beta-methoxyethoxy) silane.
In one embodiment, the auxiliary agent is a commercially available product of polyvinyl alcohol, tetraethoxysilane, hexamethyldisiloxane, and an organic solvent isoparaffin.
The preparation method of the high-thermal-conductivity insulating silicone grease comprises the following steps:
respectively placing the basic silicone oil, the modified silicone oil, the modifier and the auxiliary agent in a vacuum stirring kettle, stirring at 25 ℃ for 30-40min at the rotating speed of 60-80r/min, uniformly mixing and defoaming to obtain a mixture; and then adding the heat-conducting filler for multiple times respectively, stirring for 2-4h under the vacuum condition, controlling the rotating speed at 1000-.
In one embodiment, the thermally conductive filler is added simultaneously with the thermally conductive reinforcing particles.
Advantageous effects
(1) The high-thermal-conductivity insulating silicone grease prepared by the invention has high thermal conductivity, good insulativity and thermal stability, the thermal conductivity coefficient of the prepared thermal-conductivity silicone grease can reach about 5W/m.K, and the high-thermal-conductivity insulating silicone grease can be used in high-efficiency heating equipment such as high-end electronic devices, network communication and the like, so that the application range of the thermal-conductivity silicone grease in a heat dissipation system is expanded.
(2) In the silicone grease, the modifier is used, one end of a molecule contains a hydrophilic group methoxyl or methoxyethoxy group which is easy to hydrolyze, the other end contains a lipophilic group which can be well compatible with the matrix silicone oil, and the modifier and the heat-conducting filler act to improve the compatibility between the heat-conducting filler and the base silicone oil and simultaneously improve the filling amount and the thermal stability of the mixture.
(3) In the silicone grease, the adopted heat-conducting filler simultaneously contains two kinds of particles with different particle diameters, and the particles can be mutually embedded during mixing, so that the integral filler can be effectively and mutually filled, and the integral heat conductivity is improved.
(4) In the silicone grease material, the carboxyl modified silicone grease is used as a base material, and the nano silver particles with aminated surfaces are used in the heat conduction enhanced nano particles, so that in the preparation of the silicone grease material, the amidation reaction between carboxyl and amino can be utilized to more tightly combine the silicone grease material with the filler, and the overall heat conduction performance and the physical strength of the material can be effectively improved.
In the preparation steps, the preparation reaction process of the hydroxyl modified silicone grease is as follows:
Detailed Description
Example 1
Firstly, 100 parts of methyl silicone oil, 15 parts of dodecyl modified silicone oil, 10 parts of dodecyl trimethoxy silane and 40 parts of isoparaffin organic solvent are respectively added into a vacuum stirring kettle, stirred for 30 minutes at 25 ℃ at the rotating speed of 60r/min, uniformly mixed and defoamed to obtain a mixture; and adding 500 parts of spheroidal aluminum nitride with the particle sizes of 1 mu m, 5 mu m and 10 mu m and 1000 parts of aluminum powder with the particle sizes of 1 mu m and 10 mu m into the mixture by three times, wherein the weight ratio of the three types of aluminum nitride with the particle sizes is 1: 3: 6, the weight ratio of the aluminum powder with the two particle sizes is 1: 10, stirring and defoaming for 4 hours in vacuum at 40 ℃ at the rotating speed of 1000r/min, and uniformly stirring to obtain the high-thermal-conductivity insulating silicone grease.
Example 2
Firstly, respectively adding 100 parts of methyl vinyl silicone oil, 15 parts of heptane modified silicone oil, 15 parts of gamma- (methacryloyloxy) propyl trimethoxy silane and 30 parts of isoparaffin organic solvent into a vacuum stirring kettle, stirring for 30 minutes at 25 ℃ at the rotating speed of 60r/min, uniformly mixing and defoaming to obtain a mixture; adding 400 parts of spheroidal aluminum nitride with the particle diameters of 5 mu m and 10 mu m, 100 parts of zinc oxide with the particle diameter of 1 mu m, 200 parts of aluminum powder with the particle diameter of 1 mu m and 100 parts of silver powder with the particle diameter of 50nm into the mixture for three times, wherein the weight ratio of the two types of aluminum nitride with the particle diameters is 1: and 4, stirring and defoaming for 3 hours in vacuum at the temperature of 60 ℃ at the rotating speed of 1200r/min to obtain the high-thermal-conductivity insulating silicone grease.
Example 3
Firstly, 100 parts of methyl phenyl silicone oil, 20 parts of dodecyl modified silicone oil, 15 parts of vinyl tri (beta-methoxyethoxy) silane and 35 parts of isoparaffin organic solvent are respectively added into a vacuum stirring kettle, stirred for 30 minutes at 25 ℃ at the rotating speed of 60r/min, uniformly mixed and defoamed to obtain a mixture; and adding 300 parts of boron nitride with the particle sizes of 5 micrometers and 10 micrometers, 400 parts of aluminum nitride with the particle size of 1 micrometer, 200 parts of aluminum powder with the particle size of 1 micrometer and 100 parts of nano graphene into the mixture for three times, wherein the weight ratio of the two kinds of boron nitride with the particle sizes is 1: 2, stirring and defoaming for 4 hours in vacuum at 50 ℃ at the rotating speed of 2000r/min to obtain the high-thermal-conductivity insulating silicone grease.
Example 4
Firstly, 100 parts of methyl silicone oil, 10 parts of dodecyl modified silicone oil, 20 parts of dodecyl trimethoxy silane and 35 parts of isoparaffin organic solvent are respectively added into a vacuum stirring kettle, stirred for 30 minutes at 25 ℃ at the rotating speed of 60r/min, uniformly mixed and defoamed to obtain a mixture; adding 600 parts of spheroidal aluminum nitride with the particle sizes of 1 micron and 10 microns, 100 parts of silicon nitride with the particle size of 5 microns, 400 parts of aluminum powder with the particle sizes of 1 micron and 10 microns and 100 parts of nano graphene into the mixture for three times, wherein the weight ratio of the two aluminum nitride particles is 1: 5, the weight ratio of the aluminum powder with the two particle sizes is 1: and 3, stirring and defoaming for 3 hours in vacuum at the temperature of 60 ℃ at the rotating speed of 1200r/min to obtain the high-thermal-conductivity insulating silicone grease.
Example 5
The difference from example 2 is that: the surface of the nano silver powder is modified by amino.
Firstly, respectively adding 100 parts of methyl vinyl silicone oil, 15 parts of heptane modified silicone oil, 15 parts of gamma- (methacryloyloxy) propyl trimethoxy silane and 30 parts of isoparaffin organic solvent into a vacuum stirring kettle, stirring for 30 minutes at 25 ℃ at the rotating speed of 60r/min, uniformly mixing and defoaming to obtain a mixture; adding 400 parts of spheroidal aluminum nitride with the particle diameters of 5 mu m and 10 mu m, 100 parts of zinc oxide with the particle diameter of 1 mu m, 200 parts of aluminum powder with the particle diameter of 1 mu m and 100 parts of amino-modified nano silver powder with the particle diameter of 50nm into the mixture for three times, wherein the weight ratio of the two types of aluminum nitride with the particle diameters is 1: and 4, stirring and defoaming for 3 hours in vacuum at the temperature of 60 ℃ at the rotating speed of 1200r/min to obtain the high-thermal-conductivity insulating silicone grease.
The preparation method of the amino-modified nano silver powder comprises the following steps: preparing aqueous solution of silver nitrate with the concentration of 0.1 weight percent and ethylenediamine with the concentration of 1.5 weight percent, and adding NaBH with the target concentration of 0.15 weight percent under the ice bath condition4And carrying out reduction reaction, centrifugally separating reaction products, washing with deionized water, and drying under reduced pressure to obtain the amino modified nano silver.
Example 6
The difference from example 2 is that: the modified silicone oil is modified by carboxyl.
Firstly, respectively adding 100 parts of methyl vinyl silicone oil, 15 parts of carboxyl modified heptane modified silicone oil, 15 parts of gamma- (methacryloyloxy) propyl trimethoxy silane and 30 parts of isoparaffin organic solvent into a vacuum stirring kettle, stirring for 30 minutes at 25 ℃ at the rotating speed of 60r/min, uniformly mixing and defoaming to obtain a mixture; adding 400 parts of spheroidal aluminum nitride with the particle diameters of 5 mu m and 10 mu m, 100 parts of zinc oxide with the particle diameter of 1 mu m, 200 parts of aluminum powder with the particle diameter of 1 mu m and 100 parts of silver powder with the particle diameter of 50nm into the mixture for three times, wherein the weight ratio of the two types of aluminum nitride with the particle diameters is 1: and 4, stirring and defoaming for 3 hours in vacuum at the temperature of 60 ℃ at the rotating speed of 1200r/min to obtain the high-thermal-conductivity insulating silicone grease.
The preparation method of the carboxyl modified heptane modified silicone oil comprises the following steps: step 1, mixing 25 parts of 3-heptenoic acid and 35 parts of toluene in nitrogen atmosphere according to parts by weight, adding an organic platinum catalyst, dropwise adding 12 parts of methyl dichlorosilane, and heating to 70-85 ℃ for reaction for 4 hours; after the reaction is finished, decompressing and removing the solvent to obtain carboxyl modified silane; step 2, dripping 40 parts of carboxyl modified silane and 40 parts of dimethyldichlorosilane into 60 parts of deionized water by weight, heating to 40-60 ℃ for hydrolysis reaction, continuing to keep the temperature for 2 hours after the reaction is finished, adding ethyl acetate after the reaction is finished, washing the product until the pH is neutral, standing for layering, removing a water phase, and removing a solvent by organic phase decompression to obtain a carboxyl modified condensation compound; and 3, reacting 110 parts by weight of carboxyl modified condensation compound, 13 parts by weight of hexamethyldisiloxane and 4 parts by weight of concentrated sulfuric acid at 80 ℃ for 8 hours in a nitrogen atmosphere, adding ethyl acetate into a reaction product, washing the product until the pH value is neutral, standing for layering, removing a water phase, carrying out vacuum distillation on the organic phase, and taking a fraction at 108-112 ℃ under 1500Pa to obtain the carboxyl modified silicone oil.
Example 7
The difference from example 6 is that: the surface of the nano silver powder is modified by amino.
Firstly, respectively adding 100 parts of methyl vinyl silicone oil, 15 parts of carboxyl modified heptane modified silicone oil, 15 parts of gamma- (methacryloyloxy) propyl trimethoxy silane and 30 parts of isoparaffin organic solvent into a vacuum stirring kettle, stirring for 30 minutes at 25 ℃ at the rotating speed of 60r/min, uniformly mixing and defoaming to obtain a mixture; adding 400 parts of spheroidal aluminum nitride with the particle diameters of 5 mu m and 10 mu m, 100 parts of zinc oxide with the particle diameter of 1 mu m, 200 parts of aluminum powder with the particle diameter of 1 mu m and 100 parts of amino-modified nano silver powder with the particle diameter of 50nm into the mixture for three times, wherein the weight ratio of the two types of aluminum nitride with the particle diameters is 1: and 4, stirring and defoaming for 3 hours in vacuum at the temperature of 60 ℃ at the rotating speed of 1200r/min to obtain the high-thermal-conductivity insulating silicone grease.
The preparation method of the carboxyl modified heptane modified silicone oil comprises the following steps: step 1, mixing 25 parts of 3-heptenoic acid and 35 parts of toluene in nitrogen atmosphere according to parts by weight, adding an organic platinum catalyst, dropwise adding 12 parts of methyl dichlorosilane, and heating to 70-85 ℃ for reaction for 4 hours; after the reaction is finished, decompressing and removing the solvent to obtain carboxyl modified silane; step 2, dripping 40 parts of carboxyl modified silane and 40 parts of dimethyldichlorosilane into 60 parts of deionized water by weight, heating to 40-60 ℃ for hydrolysis reaction, and keeping the temperature for 2 hours after the reaction is finishedAfter the reaction is finished, adding ethyl acetate, washing the product until the pH value is neutral, standing for layering, removing a water phase, and removing the solvent by organic phase decompression to obtain a carboxyl modified condensation compound; and 3, reacting 110 parts by weight of carboxyl modified condensation compound, 13 parts by weight of hexamethyldisiloxane and 4 parts by weight of concentrated sulfuric acid at 80 ℃ for 8 hours in a nitrogen atmosphere, adding ethyl acetate into a reaction product, washing the product until the pH value is neutral, standing for layering, removing a water phase, carrying out vacuum distillation on the organic phase, and taking a fraction at 108-112 ℃ under 1500Pa to obtain the carboxyl modified silicone oil. The preparation method of the amino-modified nano silver powder comprises the following steps: preparing aqueous solution of silver nitrate with the concentration of 0.1 weight percent and ethylenediamine with the concentration of 1.5 weight percent, and adding NaBH with the target concentration of 0.15 weight percent under the ice bath condition4And carrying out reduction reaction, centrifugally separating reaction products, washing with deionized water, and drying under reduced pressure to obtain the amino modified nano silver.
Comparative example 1
The difference from example 1 is that: the addition specification of the aluminum powder is not added with a grade of 1 μm, and a grade of 10 μm is completely adopted.
Firstly, 100 parts of methyl silicone oil, 15 parts of dodecyl modified silicone oil, 10 parts of dodecyl trimethoxy silane and 40 parts of isoparaffin organic solvent are respectively added into a vacuum stirring kettle, stirred for 30 minutes at 25 ℃ at the rotating speed of 60r/min, uniformly mixed and defoamed to obtain a mixture; and adding 500 parts of spheroidal aluminum nitride with the particle sizes of 1 micron, 5 microns and 10 microns and 1000 parts of aluminum powder with the particle size of 10 microns into the mixture by three times, wherein the weight ratio of the three types of aluminum nitride with the particle sizes is 1: 3: and 6, stirring and defoaming for 4 hours in vacuum at 40 ℃ at the rotating speed of 1000r/min, and uniformly stirring to obtain the high-thermal-conductivity insulating silicone grease.
Comparative example 2
The difference from example 1 is that: the modifier dodecyl trimethoxy silane is not added in the preparation of the silicone grease.
Firstly, 100 parts of methyl silicone oil, 15 parts of dodecyl modified silicone oil and 40 parts of isoparaffin organic solvent are respectively added into a vacuum stirring kettle, stirred for 30 minutes at 25 ℃ at the rotating speed of 60r/min, uniformly mixed and defoamed to obtain a mixture; and adding 500 parts of spheroidal aluminum nitride with the particle sizes of 1 mu m, 5 mu m and 10 mu m and 1000 parts of aluminum powder with the particle sizes of 1 mu m and 10 mu m into the mixture by three times, wherein the weight ratio of the three types of aluminum nitride with the particle sizes is 1: 3: 6, the weight ratio of the aluminum powder with the two particle sizes is 1: 10, stirring and defoaming for 4 hours in vacuum at 40 ℃ at the rotating speed of 1000r/min, and uniformly stirring to obtain the high-thermal-conductivity insulating silicone grease.
The heat conductive silicone greases prepared in preparation examples 1 to 7 and comparative examples 1 to 2 were coated on a thermal resistance meter table with a thickness of about 0.1mm, and the thermal conductivity and the thermal resistance were measured.
The heat conductive silicone grease materials obtained in examples 1 to 7 and comparative examples 1 to 2 were tested, and the results were as follows:
the invention has the advantages of high heat-conducting property, good insulativity, low oil yield, simple preparation method and good application prospect. It can be seen from the comparison between the embodiment 1 and the comparative example 1 that the aluminum powder with small particle size and large particle size is used for matching, so that the mutual embedding and filling of the fillers can be better realized, and the heat conductivity of the silicone grease material can be effectively improved after the fillers with two particle sizes are matched; as can be seen from the comparison of examples 5 to 7, the surface of the heat-conducting nano silver powder is subjected to amino modification, and then can be effectively crosslinked with the carboxyl modified silicone grease, so that the heat-conducting property of the whole silicone grease material can be improved. As can be seen from the comparison between the example 1 and the comparative example 2, the modifier is a compound whose one end of the molecule contains a hydrophilic group methoxy or methoxyethoxy group which is easy to hydrolyze, and the other end contains a lipophilic group, which can be well compatible with the base silicone oil, and the modifier acts with the heat-conducting filler to improve the compatibility between the heat-conducting filler and the base silicone oil, and simultaneously improve the filling amount and the thermal stability of the mixture.
After the silicone grease material is subjected to cyclic temperature change treatment for 100 cycles at the temperature of-30-70 ℃, the thermal conductivity and the thermal resistance are repeatedly measured, and the results are as follows:
compared with the comparative example 2, after the cold and hot cycle failure test, the thermal conductivity coefficient reduction rate reaches 14.7% because the silicone grease is not treated by the modifier, and the compatibility between the thermal conductive filler and the base silicone oil can be effectively improved because the silicone grease is treated by the modifier containing hydrophilic groups which are easy to hydrolyze, the silicone grease surface is not easy to age, and the thermal conductivity coefficient reduction rate is 3.9%.
Claims (10)
1. The high-thermal-conductivity insulating silicone grease is characterized by comprising the following components in parts by weight: 100 parts of basic silicone oil, 10-20 parts of modified silicone oil, 500-1500 parts of heat-conducting filler, 10-20 parts of modifier and 30-40 parts of assistant.
2. The high thermal conductivity silicone grease as claimed in claim 1, wherein in one embodiment, the thermal conductive filler is a mixture of fillers of a first particle size and a second particle size, and the first particle size is larger than the second particle size; in one embodiment, the first particle size is 5 to 10 μm and the second particle size is 1 to 5 μm; in one embodiment, the thermally conductive filler is selected from one or more of aluminum nitride, zinc oxide, boron nitride, and silicon nitride.
3. The high thermal conductive silicone grease according to claim 1, wherein in one embodiment, the base silicone oil is at least one of linear organopolysiloxane comprising methyl silicone oil, methyl vinyl silicone oil and methyl phenyl silicone oil, and has a viscosity of 150 to 500 mpa.s at 25 ℃; in one embodiment, the linear organopolysiloxane is a blend of one or more of methyl terminated and methyl vinyl terminated polyorganosiloxanes.
4. The high thermal conductivity silicone grease according to claim 1, wherein in one embodiment, the high thermal conductivity silicone grease further comprises 50-200 parts of thermal conductivity enhancing particles, wherein the thermal conductivity enhancing particles are one or more of micron-sized aluminum powder, nano-silver powder and nano-graphene; in one embodiment, the surface of the nano silver powder is modified by amino; the preparation method of the nano silver powder comprises the following steps: preparing aqueous solution of silver nitrate with the concentration of 0.05-0.1wt% and ethylenediamine with the concentration of 1-2wt%, and adding NaBH with the target concentration of 0.1-0.2wt% under the ice bath condition4And carrying out reduction reaction, centrifugally separating reaction products, washing with deionized water, and drying under reduced pressure to obtain the amino modified nano silver.
5. The high thermal conductivity silicone grease according to claim 1, wherein in one embodiment, the modified silicone oil is a long chain alkyl modified silicone oil or a carboxyl modified silicone oil, and the viscosity at 25 ℃ is 50 to 200 mPa.s; in one embodiment, the carboxyl-modified silicone oil is prepared as follows: step 1, mixing 20-30 parts of 3-heptenoic acid and 30-45 parts of a first organic solvent in a nitrogen atmosphere according to parts by weight, adding an organic platinum catalyst, dropwise adding 12-15 parts of methyl dichlorosilane, and heating for reaction; after the reaction is finished, decompressing and removing the solvent to obtain carboxyl modified silane; step 2, dropwise adding 30-45 parts of carboxyl modified silane and 35-50 parts of dimethyldichlorosilane into 50-70 parts of deionized water by weight, heating to perform hydrolysis reaction, keeping the temperature continuously after the reaction is finished, adding a second organic solvent after the reaction is finished, washing the product until the pH is neutral, standing for layering, removing a water phase, and removing the solvent by organic phase decompression to obtain a carboxyl modified condensation compound; and 3, performing end-capping reaction on 120 parts by weight of carboxyl modified condensation compound 100, 12-15 parts by weight of hexamethyldisiloxane and 3-5 parts by weight of concentrated sulfuric acid in a nitrogen atmosphere, adding a second organic solvent into a reaction product, washing the product until the pH value is neutral, standing for layering, removing a water phase, performing vacuum distillation on the organic phase, and taking low-boiling-point substances to obtain the carboxyl modified silicone oil.
6. The high thermal conductivity silicone grease as claimed in claim 1, wherein in one embodiment, in step 1, the temperature-raising reaction is carried out at 70-85 ℃ for 2-5h, and the organic solvent is toluene or xylene; in one embodiment, in the step 2, the temperature-rising reaction refers to a reaction at 40-60 ℃ and the holding time is 1-3 h; in one embodiment, the end-capping reaction in step 3 is carried out at 70-85 ℃ for 6-10h, and the low-boiling point substance is a fraction at 108-112 ℃ under the absolute pressure of 1000-2000 Pa.
7. The high thermal conductivity silicone grease as claimed in claim 1, wherein in one embodiment, the modifier is an organosilane containing a hydrophilic group; in one embodiment, the hydrophilic group is selected from methoxy or methoxyethoxy groups; in one embodiment, the modifier is at least one of gamma- (methacryloyloxy) propyltrimethoxysilane, dodecyltrimethoxysilane, and vinyltris (beta-methoxyethoxy) silane.
8. The high thermal conductivity silicone grease as claimed in claim 1, wherein the auxiliary agent is a commercially available product of polyvinyl alcohol, tetraethoxysilane, hexamethyldisiloxane and isoparaffin as an organic solvent.
9. The method for preparing the high thermal conductivity silicone grease as claimed in claim 1, comprising the steps of: respectively placing the basic silicone oil, the modified silicone oil, the modifier and the auxiliary agent in a vacuum stirring kettle, stirring at 25 ℃ for 30-40min at the rotating speed of 60-80r/min, uniformly mixing and defoaming to obtain a mixture; and then adding the heat-conducting filler for multiple times respectively, stirring for 2-4h under the vacuum condition, controlling the rotating speed at 1000-.
10. The method of preparing a high thermal conductive silicone grease according to claim 9, wherein in one embodiment, the thermal conductive filler is added simultaneously with the thermal conductive reinforcing particles.
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