High-thermal-conductivity and high-filling ferrite silicone rubber composite material and preparation method thereof

Abstract

The invention discloses a high-thermal-conductivity and high-filling ferrite silicone rubber composite material and a preparation method thereof, and relates to the field of chemical materials, and the composite material comprises the following components in parts by mmol: 8-10 parts of a diamine compound, 5-8 parts of ferrite, 0.7-0.9 part of a stabilizer, 0.4-0.5 mmol of a hydroxyl compound, 0.08-0.1 part of polyvinylpyrrolidone with Mw of 40000, 1-3 parts of sugar providing carbon element, and 2.4-5 parts of a catalyst. 0.4 to 1.2 parts of a coupling agent; according to the invention, the ferrite is modified, a carbon nanolayer formed by the modified ferrite and the carbon black is chemically bonded with the silicone rubber, a synergistic effect is formed in improving the thermal conductivity of the silicone rubber filling, and the heating material obtained by the formula and the method provided by the invention enables the silicone rubber filling to be more complete and the thermal conductivity to be higher.

Description

Technical Field

[0001] The invention relates to the field of chemical materials, in particular to a high-thermal-conductivity and high-filling ferrite silicone rubber composite material and a preparation method thereof. Background Art

[0002] Silicone rubber is a polymer compound with Si-O bond as the main chain and methyl and phenyl groups as side groups. It has excellent heat resistance, ozone resistance, arc resistance, weather resistance and physiological inertness, etc. It is widely used in the fields of construction, automobiles, medical materials, electrical insulation materials and aerospace. At present, the silicone rubber phase interface in the heating material has no chemical bond and poor dispersibility, resulting in a low filling amount of the heating filler. The low filling amount of silicone rubber will lead to problems in heat conduction. The speed of heat conduction to the heating material is slow, resulting in more heat being enriched on the patch, and the temperature is high, which will lead to the life of the silicone rubber in the long run. The present invention provides a ferrite that is wrapped by polyvinyl pyrrolidone and carbon to form a powder particle with ferrite as the core and black carbon as the shell, and then polymerized with KH560 under the catalysis of aluminum acetylacetonate, and then further made into a heating material with high temperature resistant silicone rubber. The heating material made in this way not only increases the filling amount of silicone rubber, but also increases the speed of heat conduction of the heating material.

[0003] Ferrite can absorb microwaves and generate heat. It is a magnetic medium with magnetic absorption and a dielectric with electrical absorption. It is a type of microwave absorbing material with excellent performance. Ferrite materials are a type of microwave absorbing material that has been studied earlier. They are widely used in the field of microwave absorbing because of their high magnetic permeability, strong coercive force and excellent corrosion resistance. Ferrite can also be used to improve the hardness and strength of silicone rubber.

[0004] Most of the ferrite silicone rubber composite materials on the market are composite materials made of ferrite and silicone rubber, but the compatibility problem between the two cannot be solved. If the compatibility problem is improved, it will be helpful to increase the filling amount. The present invention solves such a problem. Summary of the invention

[0005] In order to solve the deficiencies of the prior art, the purpose of the present invention is to modify the ferrite, and the carbon nanolayer composed of the modified ferrite and carbon black forms a synergistic effect with the silicone rubber, and the combination of chemical bonds makes the thermal conductivity of the silicone rubber filling higher.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A high-thermal-conductivity and high-filling ferrite silicone rubber composite material comprises, by mmol, 8-10 parts of a diamine compound, 5-8 parts of ferrite, 0.7-0.9 parts of a stabilizer, 0.04-0.05 mmol of a hydroxy compound, 0.08-0.1 parts of polyvinyl pyrrolidone with a Mw of 40,000, 1-3 parts of sugar providing carbon elements, 2.4-5 parts of a catalyst, and 0.4-1.2 parts of a coupling agent.

[0008] In the aforementioned high thermal conductivity and high filling ferrite silicone rubber composite material, the diamine-based compound is one or a combination of ethylenediamine, hydroxyethylethylenediamine, dimethylethylenediamine, ethylene oxide amine or diethylenetriamine.

[0009] In the aforementioned high thermal conductivity and high filling ferrite silicone rubber composite material, the stabilizer is one or more of polyethylene glycol 2000, polyethylene glycol 200, polyethylene glycol 400, polylactide or methyl methacrylate.

[0010] In the aforementioned high thermal conductivity and high filling ferrite silicone rubber composite material, the ferrite is one or more of ferroferric oxide or manganese-zinc ferrite.

[0011] In the aforementioned high thermal conductivity and high filling ferrite silicone rubber composite material, the polyhydroxy compound is one or more of ethylene glycol, propylene glycol or pentaerythritol.

[0012] In the aforementioned high thermal conductivity and high filling ferrite silicone rubber composite material, the sugar providing the carbon element is one or more of glucose, monosaccharide, fructose or galactose.

[0013] In the aforementioned high thermal conductivity and high filling ferrite silicone rubber composite material, the catalyst is one or more of aluminum acetylacetonate or cobalt acetylacetonate.

[0014] In the aforementioned high thermal conductivity and high filling ferrite silicone rubber composite material, the coupling agent is one or more of KH560, 3-glycidyloxypropyltrimethoxysilane or 3-glycidyloxypropyltriethoxysilane.

[0015] The aforementioned high thermal conductivity and high filling ferrite silicone rubber composite material includes, in mmol parts: 8-10 parts of ethylenediamine, 5-8 parts of FeCl3·6H2O, 0.7-0.9 parts of polyethylene glycol PEG2000, 0.04-0.05mmol ethylene glycol EG, 0.08-0.1 parts of polyvinyl pyrrolidone with Mw=40000, 1-3 parts of d-glucose, 2.4-5 parts of aluminum acetylacetonate, and 0.4-1.2 parts of KH560.

[0016] A method for preparing a high thermal conductivity and high filling ferrite silicone rubber composite material comprises the following steps:

[0017] Step 1, preparing materials in mmol, including: 8-10 parts of diamine compound, 5-8 parts of ferrite, 0.7-0.9 parts of stabilizer, 0.04-0.05mmol of hydroxyl compound, 0.08-0.1 parts of polyvinyl pyrrolidone with Mw=40000, 1-3 parts of sugar providing carbon element, 2.4-5 parts of catalyst, and 0.4-1.2 parts of coupling agent;

[0018] Step 2: Mix the diamine compound with ferrite, polyethylene glycol and polyhydroxy compound, and then cool, centrifuge, collect, wash and dry to obtain a yellow solid;

[0019] Step 3, adding the yellow solid obtained in step 2 and polyvinyl pyrrolidone into water, stirring vigorously at room temperature for 6h-8h, and obtaining a polyvinyl pyrrolidone-modified precursor by centrifugation;

[0020] Step 4: After vigorously stirring the polyvinyl pyrrolidone modified precursor and the sugar compound obtained in step 3 in water, the mixture is placed in an autoclave, sealed, heated at 180°C-200°C for 3-5h, centrifuged to obtain a carbon black-coated ferrite black solid, washed with water and ethanol several times, and dried at high temperature for 5h-7h; the composition is controlled by adjusting the sugar compound / polyvinyl pyrrolidone modified precursor molar ratio, δ=0.5:1, 1:1, 2:1, 3:1 and 4:1;

[0021] Step 5, further reacting the particles obtained in step 4 with a catalyst and a coupling agent;

[0022] Step six, mixing the material particles obtained in step five with silicone rubber, and molding and vulcanizing to form a composite material.

[0023] The present invention is beneficial in that:

[0024] The present invention firstly mixes ferrite with ethylenediamine (EDA), polyethylene glycol (PEG2000) and ethylene glycol (EG) to form a flake precursor, then encapsulates the precursor with polyvinyl pyrrolidone to obtain a modified precursor, and finally heats the precursor at a high temperature to obtain solid carbon black. Part of the carbonized surface of the particle powder has residual hydroxyl groups, which are modified by using a KH560 coupling agent. The obtained carbon nanolayer is added into the silicone rubber, so that not only chemical bonds are formed, but also the dispersibility of the silicone rubber is improved; the carbon nanolayer composed of the modified ferrite and carbon black forms a synergistic effect with the silicone rubber in improving the thermal conductivity;

[0025] The present invention first modifies ferrite, then forms carbon black through glucose at high temperature, and forms a carbon nanolayer with granular powder using the modified ferrite as a core and the carbon black as a shell, which is added to silicone rubber to form a wave-absorbing and heat-generating material; the carbon nanolayer is combined with the silicone rubber through chemical bonds, so that the thermal conductivity of the silicone rubber filling is higher and the filling is more complete. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a TGA chart of the glucose / polyvinyl pyrrolidone modified precursor of the present invention at a molar ratio of 4:1. DETAILED DESCRIPTION

[0027] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] (1) The flake precursor was synthesized by solvothermal reaction. 10 mmol of ethylenediamine (EDA) was added to a mixture of FeCl3·6H2O (5 mmol), polyethylene glycol (PEG2000, 0.7 mmol) and ethylene glycol (EG, 40 mL) at room temperature. After stirring for another 2 hours, the resulting solution was transferred to a 100 mL stainless steel autoclave lined with polytetrafluoroethylene. The autoclave was sealed, heated at 200°C for 6 hours, and cooled naturally to room temperature. The light yellow precursor was collected by centrifugation, washed several times with water and anhydrous ethanol, and finally dried in a vacuum oven at 60°C for 5 hours.

[0030] (2) The surface of the particles obtained in (1) is positively charged, and after being wrapped with negatively charged polyvinyl pyrrolidone, they have good dispersibility in water. The precursor obtained in (1) and 0.08 mmol polyvinyl pyrrolidone (Mw = 40000) were added to 120 mL of water, vigorously stirred at room temperature for 6 h, and the surface-modified precursor was obtained by multiple centrifugation and water dispersion.

[0031] (3) 1 mmol of the polyvinyl pyrrolidone-modified precursor obtained in (2) and 1 mmol of d-glucose were dispersed in 60 mL of H2O. After vigorous stirring for 30 min, the resulting solution was placed in a 100 ml stainless steel autoclave lined with polytetrafluoroethylene, sealed, heated at 180°C for 3 h, and centrifuged to obtain a black solid product, which was washed with water and ethanol three times and dried at 60°C for 5 h.

[0032] (4) The particles obtained in (3) were further reacted with 2.4 mmol of aluminum acetylacetonate and 0.4 mmol of KH560.

[0033] (5) The obtained material particles are mixed with silicone rubber to prepare a heating material.

[0034] By adjusting the glucose / precursor molar ratio δ=0.5:1.

[0035] Example 2

[0036] (1) The flake precursor was synthesized by solvothermal reaction. 8 mmol of ethylenediamine (EDA) was added to a mixture of FeCl3·6H2O (5 mmol), polyethylene glycol (PEG2000, 0.7 mmol) and ethylene glycol (EG, 40 mL) at room temperature. After stirring for another 2 hours, the resulting solution was transferred to a 100 mL stainless steel autoclave lined with polytetrafluoroethylene. The autoclave was sealed, heated at 200°C for 6 hours, and cooled naturally to room temperature. The light yellow precursor was collected by centrifugation, washed several times with water and anhydrous ethanol, and finally dried in a vacuum oven at 60°C for 5 hours.

[0037] (2) The surface of the particles obtained in (1) is positively charged, and after being wrapped with negatively charged polyvinyl pyrrolidone, they have good dispersibility in water. The precursor obtained in (1) and 0.08 mmol polyvinyl pyrrolidone (Mw = 40000) were added to 120 mL of water, vigorously stirred at room temperature for 6 h, and the surface-modified precursor was obtained by multiple centrifugation and water dispersion.

[0038] (3) 1 mmol of the polyvinyl pyrrolidone-modified precursor obtained in (2) and 1 mmol of d-glucose were dispersed in 60 mL of H2O. After vigorous stirring for 30 min, the resulting solution was placed in a 100 ml stainless steel autoclave lined with polytetrafluoroethylene, sealed, heated at 180°C for 3 h, and centrifuged to obtain a black solid product, which was washed with water and ethanol three times and dried at 60°C for 5 h.

[0039] (4) The particles obtained in (3) were further reacted with 2.4 mmol of aluminum acetylacetonate and 0.4 mmol of KH560.

[0040] (5) The obtained material particles are mixed with silicone rubber to prepare a heating material.

[0041] By adjusting the glucose / precursor molar ratio δ = 1:1.

[0042] Example 3

[0043] (1) The flake precursor was synthesized by solvothermal reaction. 10 mmol of ethylenediamine (EDA) was added to a mixture of FeCl3·6H2O (5 mmol), polyethylene glycol (PEG2000, 0.7 mmol) and ethylene glycol (EG, 40 mL) at room temperature. After stirring for another 2 hours, the resulting solution was transferred to a 100 mL stainless steel autoclave lined with polytetrafluoroethylene. The autoclave was sealed, heated at 200°C for 6 hours, and cooled naturally to room temperature. The light yellow precursor was collected by centrifugation, washed several times with water and anhydrous ethanol, and finally dried in a vacuum oven at 60°C for 5 hours.

[0044] (2) The surface of the particles obtained in (1) is positively charged, and after being wrapped with negatively charged polyvinyl pyrrolidone, they have good dispersibility in water. The precursor obtained in (1) and 0.08 mmol polyvinyl pyrrolidone (Mw = 40000) were added to 120 mL of water, vigorously stirred at room temperature for 6 h, and the surface-modified precursor was obtained by multiple centrifugation and water dispersion.

[0045] (3) 1 mmol of the polyvinyl pyrrolidone-modified precursor obtained in (2) and 3 mmol of d-glucose were dispersed in 60 mL of H2O. After vigorous stirring for 30 min, the resulting solution was placed in a 100 ml stainless steel autoclave lined with polytetrafluoroethylene, sealed, heated at 180°C for 3 h, and centrifuged to obtain a black solid product, which was washed with water and ethanol three times and dried at 60°C for 5 h.

[0046] (4) The particles obtained in (3) were further reacted with 2.4 mmol of aluminum acetylacetonate and 0.4 mmol of KH560.

[0047] (5) The obtained material particles are mixed with silicone rubber to prepare a heating material.

[0048] By adjusting the glucose / precursor molar ratio δ=2:1.

[0049] Example 4

[0050] (1) The flake precursor was synthesized by solvothermal reaction. 10 mmol of ethylenediamine (EDA) was added to a mixture of FeCl3·6H2O (5 mmol), polyethylene glycol (PEG2000, 0.7 mmol) and ethylene glycol (EG, 40 mL) at room temperature. After stirring for another 2 hours, the resulting solution was transferred to a 100 mL stainless steel autoclave lined with polytetrafluoroethylene. The autoclave was sealed, heated at 200°C for 6 hours, and cooled naturally to room temperature. The light yellow precursor was collected by centrifugation, washed several times with water and anhydrous ethanol, and finally dried in a vacuum oven at 60°C for 5 hours.

[0051] (2) The surface of the particles obtained in (1) is positively charged, and after being wrapped with negatively charged polyvinyl pyrrolidone, they have good dispersibility in water. The precursor obtained in (1) and 0.08 mmol polyvinyl pyrrolidone (Mw = 40000) were added to 120 mL of water, vigorously stirred at room temperature for 6 h, and the surface-modified precursor was obtained by multiple centrifugation and water dispersion.

[0052] (3) 1 mmol of the polyvinyl pyrrolidone-modified precursor obtained in (2) and 1 mmol of d-glucose were dispersed in 60 mL of H2O. After vigorous stirring for 30 min, the resulting solution was placed in a 100 ml stainless steel autoclave lined with polytetrafluoroethylene, sealed, heated at 180°C for 3 h, and centrifuged to obtain a black solid product, which was washed with water and ethanol three times and dried at 60°C for 5 h.

[0053] (4) The particles obtained in (3) were further reacted with 2.4 mmol of aluminum acetylacetonate and 0.4 mmol of KH560.

[0054] (5) The obtained material particles are mixed with silicone rubber to prepare a heating material.

[0055] By adjusting the glucose / precursor molar ratio δ=3:1.

[0056] Example 5

[0057] (1) The flake precursor was synthesized by solvothermal reaction. 10 mmol of ethylenediamine (EDA) was added to a mixture of FeCl3·6H2O (5 mmol), polyethylene glycol (PEG2000, 0.7 mmol) and ethylene glycol (EG, 40 mL) at room temperature. After stirring for another 2 hours, the resulting solution was transferred to a 100 mL stainless steel autoclave lined with polytetrafluoroethylene. The autoclave was sealed, heated at 200°C for 6 hours, and cooled naturally to room temperature. The light yellow precursor was collected by centrifugation, washed several times with water and anhydrous ethanol, and finally dried in a vacuum oven at 60°C for 5 hours.

[0058] (2) The surface of the particles obtained in (1) is positively charged, and after being wrapped with negatively charged polyvinyl pyrrolidone, they have good dispersibility in water. The precursor obtained in (1) and 0.08 mmol polyvinyl pyrrolidone (Mw = 40000) were added to 120 mL of water, vigorously stirred at room temperature for 6 h, and the surface-modified precursor was obtained by multiple centrifugation and water dispersion.

[0059] (3) 1 mmol of the polyvinyl pyrrolidone-modified precursor obtained in (2) and 1 mmol of d-glucose were dispersed in 60 mL of H2O. After vigorous stirring for 30 min, the resulting solution was placed in a 100 ml stainless steel autoclave lined with polytetrafluoroethylene, sealed, heated at 180°C for 3 h, and centrifuged to obtain a black solid product, which was washed with water and ethanol three times and dried at 60°C for 5 h.

[0060] (4) The particles obtained in (3) were further reacted with 2.4 mmol of aluminum acetylacetonate and 0.4 mmol of KH560.

[0061] (5) The obtained material particles are mixed with silicone rubber to prepare a heating material.

[0062] By adjusting the glucose / precursor molar ratio δ=4:1.

[0063] Example 6

[0064] (1) The flake precursor was synthesized by solvothermal reaction. 10 mmol of ethylenediamine (EDA) was added to a mixture of FeCl3·6H2O (6 mmol), polyethylene glycol (PEG2000, 0.8 mmol) and ethylene glycol (EG, 40 mL) at room temperature. After stirring for another 2 hours, the resulting solution was transferred to a 100 mL stainless steel autoclave lined with polytetrafluoroethylene. The autoclave was sealed, heated at 200°C for 6 hours, and cooled naturally to room temperature. The light yellow precursor was collected by centrifugation, washed several times with water and anhydrous ethanol, and finally dried in a vacuum oven at 60°C for 5 hours.

[0065] (2) The surface of the particles obtained in (1) is positively charged, and after being wrapped with negatively charged polyvinyl pyrrolidone, they have good dispersibility in water. The precursor obtained in (1) and 0.08 mmol polyvinyl pyrrolidone (Mw = 40000) were added to 120 mL of water, vigorously stirred at room temperature for 6 h, and the surface-modified precursor was obtained by multiple centrifugation and water dispersion.

[0066] (3) 1 mmol of the polyvinyl pyrrolidone-modified precursor obtained in (2) and 1 mmol of d-glucose were dispersed in 60 mL of H2O. After vigorous stirring for 30 min, the resulting solution was placed in a 100 ml stainless steel autoclave lined with polytetrafluoroethylene, sealed, heated at 180°C for 3 h, and centrifuged to obtain a black solid product, which was washed with water and ethanol three times and dried at 60°C for 5 h.

[0067] (4) The particles obtained in (3) were further reacted with 3 mmol of aluminum acetylacetonate and 0.4 mmol of KH560.

[0068] (5) The obtained material particles are mixed with silicone rubber to prepare a heating material.

[0069] By adjusting the glucose / precursor molar ratio δ=4:1.

[0070] Example 7

[0071] (1) The flake precursor was synthesized by solvothermal reaction. 10 mmol of ethylenediamine (EDA) was added to a mixture of FeCl3·6H2O (7 mmol), polyethylene glycol (PEG2000, 0.9 mmol) and ethylene glycol (EG, 40 mL) at room temperature. After stirring for another 2 hours, the resulting solution was transferred to a 100 mL stainless steel autoclave lined with polytetrafluoroethylene. The autoclave was sealed, heated at 200°C for 6 hours, and cooled naturally to room temperature. The light yellow precursor was collected by centrifugation, washed several times with water and anhydrous ethanol, and finally dried in a vacuum oven at 60°C for 5 hours.

[0072] (2) The surface of the particles obtained in (1) is positively charged, and after being wrapped with negatively charged polyvinyl pyrrolidone, they have good dispersibility in water. The precursor obtained in (1) and 0.1 mmol polyvinyl pyrrolidone (Mw = 40000) were added to 120 mL of water, vigorously stirred at room temperature for 6 h, and the surface-modified precursor was obtained by multiple centrifugation and water dispersion.

[0073] (3) 1 mmol of the polyvinyl pyrrolidone-modified precursor obtained in (2) and 1 mmol of d-glucose were dispersed in 60 mL of H2O. After vigorous stirring for 30 min, the resulting solution was placed in a 100 ml stainless steel autoclave lined with polytetrafluoroethylene, sealed, heated at 180°C for 3 h, and centrifuged to obtain a black solid product, which was washed with water and ethanol three times and dried at 60°C for 5 h.

[0074] (4) The particles obtained in (3) were further reacted with 2.4 mmol of aluminum acetylacetonate and 0.4 mmol of KH560.

[0075] (5) The obtained material particles are mixed with silicone rubber to prepare a heating material.

[0076] By adjusting the glucose / precursor molar ratio δ=3:1.

[0077] Example 8

[0078] (1) The flake precursor was synthesized by solvothermal reaction. 10 mmol of ethylenediamine (EDA) was added to a mixture of FeCl3·6H2O (5 mmol), polyethylene glycol (PEG2000, 0.7 mmol) and ethylene glycol (EG, 40 mL) at room temperature. After stirring for another 2 hours, the resulting solution was transferred to a 100 mL stainless steel autoclave lined with polytetrafluoroethylene. The autoclave was sealed, heated at 200°C for 6 hours, and cooled naturally to room temperature. The light yellow precursor was collected by centrifugation, washed several times with water and anhydrous ethanol, and finally dried in a vacuum oven at 60°C for 5 hours.

[0079] (2) The surface of the particles obtained in (1) is positively charged, and after being wrapped with negatively charged polyvinyl pyrrolidone, they have good dispersibility in water. The precursor obtained in (1) and 0.08 mmol polyvinyl pyrrolidone (Mw = 40000) were added to 120 mL of water, vigorously stirred at room temperature for 6 h, and the surface-modified precursor was obtained by multiple centrifugation and water dispersion.

[0080] (3) 1 mmol of the polyvinyl pyrrolidone-modified precursor obtained in (2) and 1 mmol of d-glucose were dispersed in 60 mL of H2O. After vigorous stirring for 30 min, the resulting solution was placed in a 100 ml stainless steel autoclave lined with polytetrafluoroethylene, sealed, heated at 180°C for 3 h, and centrifuged to obtain a black solid product, which was washed with water and ethanol three times and dried at 60°C for 5 h.

[0081] (4) The particles obtained in (3) were further reacted with 5 mmol of aluminum acetylacetonate and 1.2 mmol of KH560.

[0082] (5) The obtained material particles are mixed with silicone rubber to prepare a heating material.

[0083] By adjusting the glucose / precursor molar ratio δ=3:1.

[0084] Comparative Example:

[0085] (1) FeCl3·6H2O (5 mmol) and 1 mmol of d-glucose were dispersed in 60 mL of H2O. After vigorous stirring for 30 min, the resulting solution was placed in a 100 mL stainless steel autoclave lined with polytetrafluoroethylene, sealed, heated at 180°C for 3 h, and centrifuged to obtain a black solid product, which was washed with water and ethanol three times and dried at 60°C for 5 h.

[0086] (2) The particles obtained in (3) were further reacted with 2.4 mmol of aluminum acetylacetonate and 0.4 mmol of KH560.

[0087] (3) The obtained material particles are mixed with silicone rubber to prepare a heating material.

[0088] By adjusting the glucose / FeCl3·6H2O molar ratio δ=0.5:1.

[0089] Table 1 shows the heating time obtained from the heating comparison experiment of heating materials attached to aluminum ingots and the real-time temperature data of the material surface measured by the temperature reading instrument. The heating material of Example 1 (first row); the unmodified pure ferrite composite material of Comparative Example 1 (second row).

[0090] Table 1

[0091]

[0092] From the experimental results of the above comparative example 1 and examples 2-8, it can be seen that the composite materials obtained by the formula of the present invention have good technical effects, and the carbon nanolayer composed of the modified ferrite and carbon black and the silicone rubber form a synergistic effect in improving thermal conductivity.

[0093] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A high thermal conductivity and high filling ferrite silicone rubber composite material, characterized in that: The composition comprises, by mmol, 8-10 parts of a diamine compound, 5-8 parts of a ferrite, 0.7-0.9 parts of a stabilizer, 0.04-0.05 mmol of a polyhydroxy compound, 0.08-0.1 parts of polyvinyl pyrrolidone with a Mw of 40,000, 1-3 parts of a sugar providing carbon elements, 2.4-5 parts of a catalyst, and 0.4-1.2 parts of a coupling agent.

2. The high thermal conductivity and high filling ferrite silicone rubber composite material according to claim 1, characterized in that: The diamine compound is one or a combination of ethylenediamine, hydroxyethylethylenediamine, dimethylethylenediamine, ethylene oxide amine or diethylenetriamine.

3. The high thermal conductivity and high filling ferrite silicone rubber composite material according to claim 1, characterized in that: The stabilizer is one or more of polyethylene glycol 2000, polyethylene glycol 200, polyethylene glycol 400, polylactide or methyl methacrylate.

4. The high thermal conductivity and high filling ferrite silicone rubber composite material according to claim 1, characterized in that: The ferrite is one or more of ferroferric oxide or manganese-zinc ferrite.

5. The high thermal conductivity and high filling ferrite silicone rubber composite material according to claim 1, characterized in that: The polyol is one or more of ethylene glycol, glycerol or pentaerythritol.

6. The high thermal conductivity and high filling ferrite silicone rubber composite material according to claim 1, characterized in that: The sugar providing carbon elements is one or more of glucose, monosaccharide, fructose or galactose.

7. The high thermal conductivity and high filling ferrite silicone rubber composite material according to claim 1, characterized in that: The catalyst is one or more of aluminum acetylacetonate or cobalt acetylacetonate.

8. The high thermal conductivity and high filling ferrite silicone rubber composite material according to claim 1, characterized in that: The coupling agent is one or more of KH560, 3-glycidyloxypropyltrimethoxysilane or 3-glycidyloxypropyltriethoxysilane.

9. The high thermal conductivity and high filling ferrite silicone rubber composite material according to claim 1, characterized in that: The method comprises, in mmol, 8-10 parts of ethylenediamine, 5-8 parts of FeCl3·6H2O, 0.7-0.9 parts of polyethylene glycol PEG2000, 0.04-0.05 mmol of ethylene glycol EG, 0.08-0.1 parts of polyvinyl pyrrolidone with Mw=40000, 1-3 parts of d-glucose, 2.4-5 parts of aluminum acetylacetonate, and 0.4-1.2 parts of KH560.

10. A method for preparing a high thermal conductivity and high filling ferrite silicone rubber composite material, characterized in that: The steps include: Step 1, preparing materials according to mmol parts, including: 8-10 parts of diamine compound, 5-8 parts of ferrite, 0.7-0.9 parts of stabilizer, 0.04-0.05mmol of polyhydroxy compound, 0.08-0.1 parts of polyvinyl pyrrolidone with Mw=40000, 1-3 parts of sugar providing carbon element, 2.4-5 parts of catalyst, and 0.4-1.2 parts of coupling agent; Step 2: Mix the diamine compound with ferrite, polyethylene glycol and polyhydroxy compound, and then cool, centrifuge, collect, wash and dry to obtain a yellow solid; Step 3, adding the yellow solid obtained in step 2 and polyvinyl pyrrolidone into water, stirring vigorously at room temperature for 6h-8h, and obtaining a polyvinyl pyrrolidone-modified precursor by centrifugation; Step 4: After vigorously stirring the polyvinyl pyrrolidone modified precursor and the sugar compound obtained in step 3 in water, the mixture is placed in an autoclave, sealed, heated at 180°C-200°C for 3-5h, centrifuged to obtain a carbon black-coated ferrite black solid, washed with water and ethanol several times, and dried at high temperature for 5h-7h; the composition is controlled by adjusting the sugar compound / polyvinyl pyrrolidone modified precursor molar ratio, δ=0.5:1, 1:1, 2:1, 3:1 and 4:1; Step 5, further reacting the particles obtained in step 4 with a catalyst and a coupling agent; Step six, mixing the material particles obtained in step five with silicone rubber, and molding and vulcanizing to form a composite material.

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