Preparation method of insulating organic silicon pouring sealant with low dielectric constant and high thermal conductivity

Abstract

The invention belongs to the technical field of pouring sealants, and particularly relates to a preparation method of an insulating organic silicon pouring sealant with low dielectric constant and high thermal conductivity, the insulating organic silicon pouring sealant comprises a component A and a component B, the component A comprises the following preparation raw materials in percentage by weight: 10-20% of vinyl silicone oil, 2-3% of hydrogen-containing silicone oil, 0.1-0.5% of a reaction inhibitor, 60-70% of ferrochrome, 8-18% of polyvinyl alcohol and 3-10% of pure water; the component B comprises the following preparation raw materials in percentage by weight: 10-20% of vinyl silicone oil, 0.1-1% of a platinum catalyst, 60-80% of ferrochrome, 9-19% of polyvinyl alcohol, 3-10% of pure water and 0.1-0.5% of color master batch. By adjusting the formula, the low-dielectric-constant ferrochrome is added as an inorganic filler to reduce the dielectric constant of the pouring sealant, the ferrochrome has excellent thermal conductivity and can improve the thermal conductivity of the pouring sealant under different particle size ratios, and the polyvinyl alcohol is added to the formula, so that the insulating capacity of the pouring sealant can be improved, and the pouring sealant is low in viscosity and high in heat conductivity. The potting requirements of electronic product components can be met, the weather resistance and reliability of the electronic components are improved, and the service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of potting glue, and in particular relates to a preparation method of an insulating silicone potting glue with low dielectric constant and high thermal conductivity. Background Art

[0002] In the field of electronic component manufacturing, sensitive electronic components need to be encapsulated and protected to prevent mechanical damage and chemical corrosion. Through the potting process, silicone potting glue is injected around the electronic components and forms a protective barrier after curing. In the packaging and protection of key components such as battery packs and motor controllers, potting glue is often required to be filled and cured. The main purpose is to improve the weather resistance and reliability of these components, which requires the potting glue to have high thermal conductivity, low dielectric constant and insulation.

[0003] At present, some related technologies of low dielectric constant thermal conductive potting glue have appeared at home and abroad. Most of the existing technologies use thermal conductive fillers such as aluminum oxide and zinc oxide, and their dielectric constants are greater than 10, which leads to a relatively high dielectric constant of thermal conductive potting glue. Its dielectric constant is generally above 4-5, which is difficult to meet the demand for low dielectric constant. In addition, the high thermal conductivity potting glue has a large amount of thermal conductive powder aluminum oxide added, which leads to a high dielectric constant of the material. The large amount of low thermal conductivity powder added will lead to a low thermal conductivity. Increasing the particle size of thermal conductive powder and selecting spherical aluminum oxide powder can improve the thermal conductivity, but at the same time there is a problem of too high dielectric constant. Adding ferrochrome to improve thermal conductivity also has problems such as high material viscosity and high price. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing an insulating silicone potting compound with low dielectric constant and high thermal conductivity, aiming to solve the technical problems of high dielectric constant and low thermal conductivity in the prior art.

[0005] To achieve the above object, the present invention provides a method for preparing an insulating silicone potting adhesive with low dielectric constant and high thermal conductivity, comprising component A and component B; the component A comprises the following raw materials in weight percentage: 10-20% vinyl silicone oil, 2-3% hydrogenated silicone oil, 0.1-0.5% reaction inhibitor, 60-70% ferrochrome, 8-18% polyvinyl alcohol, and 3-10% pure water;

[0006] The B component comprises the following raw materials in weight percentage: 10-20% vinyl silicone oil, 0.1-1% platinum catalyst, 60-80% ferrochrome, 9-19% polyvinyl alcohol, 3-10% pure water, and 0.1-0.5% masterbatch; the mass ratio of the A component to the B component is 1:1.

[0007] The particle size of the ferrochrome is one or more of 5um, 30um, and 50um;

[0008] The particle size of the ferrochrome is a mixture of 5um, 30um and 50um, and the proportions of 5um, 30um and 50um are 28-38%: 19-30%: 34-64%.

[0009] Optionally, the hydrogen content of the hydrogen-containing silicone oil is 0.1-0.5 m / m%.

[0010] Optionally, the vinyl silicone oil has a viscosity of 100-1000 cps.

[0011] Optionally, the reaction inhibitor is a solution containing 1-ethynyl-1-cyclohexanol in an amount of 10-99.8 m / m %.

[0012] Optionally, the platinum content of the platinum catalyst is 1000-5000 ppm solution.

[0013] Optionally, a method for preparing an insulating silicone potting compound with low dielectric constant and high thermal conductivity comprises the following steps: S1: preparing component A:

[0014] According to the formula, the vinyl silicone oil, the hydrogen-containing silicone oil, the reaction inhibitor, the ferrochrome, the polyvinyl alcohol and the pure water in the component A are weighed respectively; the weighed pure water and the polyvinyl alcohol are placed in a planetary mixer with high-speed dispersion, and stirred for 60-90 minutes under vacuum and high temperature conditions until the polyvinyl alcohol is completely dissolved, and then the ferrochrome is added and stirred at high temperature for 20-30 minutes; then the vinyl silicone oil is added and the high-temperature vacuum stirring is continued for 60-90 minutes until the stirring is uniform; finally, the temperature is lowered to 40° C., the hydrogen-containing silicone oil and the reaction inhibitor are added and stirred under vacuum for 20-30 minutes, and after stirring until the mixture is uniformly dispersed, the component A is obtained;

[0015] S2 Preparation of component B:

[0016] According to the formula, the vinyl silicone oil, the platinum catalyst, the ferrochrome, the polyvinyl alcohol, the pure water and the masterbatch in the B component are weighed respectively; the weighed pure water and the polyvinyl alcohol materials are placed in a planetary mixer with high-speed dispersion, and stirred for 60-90 minutes under vacuum and high temperature conditions until the polyvinyl alcohol is completely dissolved, and then the ferrochrome is added and stirred at high temperature for 20-30 minutes, and then the vinyl silicone oil is added and stirred at high temperature and in vacuum for 60-90 minutes until the stirring is uniform, and finally the temperature is lowered to 40°C, and the platinum catalyst and the masterbatch are added and stirred in vacuum for 20-30 minutes, and after stirring until uniformly dispersed, the B component is obtained.

[0017] Optionally, the high temperature is 90-120°C.

[0018] Optionally, the planetary mixer is evacuated to -0.097 to -0.1 MPa.

[0019] Optionally, the stirring rate of the planetary mixer is 500-2000 rpm.

[0020] Optionally, the component A and the component B are compounded in a weight ratio of 1:1, stirred evenly, and cured at 60° C. for 2-4 hours or at room temperature for 24-48 hours.

[0021] The present invention adds ferrochrome with a dielectric constant of 1.18 as a filling material, so that the dielectric constant is lower. At the same time, the ferrochrome with different particle sizes can better improve the thermal conductivity of the potting glue. At the same time, the mixture of inorganic fillers with different particle sizes can have better thermal conductivity than a single particle size at the same cost. The main reasons are as follows: 1. Better filling effect: Inorganic fillers with different particle sizes will be more compact together, with better filling effect and better thermal conductivity. 2. Increase thermal conduction channels: Inorganic fillers with different particle sizes can be mixed to form a variety of thermal conduction channels of different sizes. These channels can make heat conduction more effectively, thereby improving thermal conductivity. 3. Reduce thermal conduction resistance: Inorganic fillers with different particle sizes can be mixed to form more thermal conduction interfaces. These interfaces can reduce thermal conduction resistance, thereby improving thermal conductivity. 4. Uniform distribution: The mixture of inorganic fillers with different particle sizes can make the particle distribution more uniform, which can avoid particle aggregation, reduce thermal conduction paths, and improve thermal conductivity.

[0022] The above one or more technical schemes in the preparation method of an insulating silicone potting adhesive with low dielectric constant and high thermal conductivity provided by an embodiment of the present invention have at least one of the following technical effects: the insulating silicone potting adhesive with low dielectric constant and high thermal conductivity of the present invention, through the adjustment of the formula, adds chromium iron with low dielectric constant as an inorganic filler to reduce the dielectric constant of the potting adhesive. At the same time, chromium iron has excellent thermal conductivity, and its thermal conductivity can be improved under different particle size ratios. At the same time, polyvinyl alcohol is added to the formula to improve the insulation ability of the potting adhesive. At the same time, the viscosity is low, within the range of 5000-15000cps, which can meet the potting requirements for electronic product components, improve the weather resistance and reliability of electronic components, and extend the service life. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0024] Example 1

[0025] A method for preparing an insulating silicone potting compound with low dielectric constant and high thermal conductivity, comprising component A and component B;

[0026] It comprises component A and component B; component A comprises the following raw materials in weight percentage: 20% vinyl silicone oil, the viscosity of which is 250 cps, 2.6% hydrogen-containing silicone oil, the hydrogen content of which is 0.36 m / m%, 0.1% reaction inhibitor, the reaction inhibitor being a solution containing 99.8 m / m% 1-ethynyl-1-cyclohexanol, 21.3% ferrochrome particles of 5um, 13% 30um, and 25% 50um, 10% polyvinyl alcohol, and 8% pure water;

[0027] Component B comprises the following raw materials in parts by weight: 20% vinyl silicone oil with a viscosity of 250 cps, 0.1% platinum catalyst with a platinum content of 3000 ppm solution, ferrochrome particle size 5um 18%; 30um 13%; 50um 28%, polyvinyl alcohol 12.6%, pure water 8%, masterbatch 0.3%; the mass ratio of component A to component B is 1:1.

[0028] A method for preparing an insulating silicone potting compound with low dielectric constant and high thermal conductivity comprises the following steps:

[0029] S1 Preparation of component A:

[0030] According to the formula, the vinyl silicone oil, the hydrogen-containing silicone oil, the reaction inhibitor, the ferrochrome, the polyvinyl alcohol and the pure water in the component A are weighed respectively; the weighed pure water and the polyvinyl alcohol are placed in a planetary mixer with high-speed dispersion, and stirred for 90 minutes under vacuum and high temperature conditions until the polyvinyl alcohol is completely dissolved, and then the ferrochrome is added and stirred at high temperature for 30 minutes; then the vinyl silicone oil is added and the high-temperature vacuum stirring is continued for 90 minutes until the stirring is uniform; finally, the temperature is lowered to 40°C, the hydrogen-containing silicone oil and the reaction inhibitor are added and vacuum stirred for 30 minutes, and after stirring until uniformly dispersed, the component A is obtained; the planetary mixer is evacuated to -0.1Mpa, and the high temperature is 120°C.

[0031] S2 Preparation of component B:

[0032] According to the formula, the vinyl silicone oil, the platinum catalyst, the ferrochrome, the polyvinyl alcohol, the pure water and the masterbatch in the B component are weighed respectively; the weighed pure water and the polyvinyl alcohol materials are placed in a planetary mixer with high-speed dispersion, and stirred for 90 minutes under vacuum and high temperature until the polyvinyl alcohol is completely dissolved, and then the ferrochrome is added, and the high-temperature stirring is performed for 30 minutes, and then the vinyl silicone oil is added, and the high-temperature vacuum stirring is continued for 90 minutes until the stirring is uniform, and finally the temperature is lowered to 40°C, and the platinum catalyst and the masterbatch are added and vacuum stirred for 20-30 minutes, and the B component is obtained after stirring until uniformly dispersed. The planetary mixer is evacuated to -0.1Mpa, and the high temperature is 120°C. The A component and the B component are compounded in a weight ratio of 1:1, stirred evenly, and cured at 60°C for 2-4 hours or at room temperature for 24-48 hours.

[0033] Example 2

[0034] A method for preparing an insulating silicone potting compound with low dielectric constant and high thermal conductivity, comprising component A and component B;

[0035] The invention comprises component A and component B; the component A comprises the following raw materials in weight percentage: 13% vinyl silicone oil, the viscosity of the vinyl silicone oil is 250cps, 2.6% hydrogen-containing silicone oil, the hydrogen content of the hydrogen-containing silicone oil is 0.36m / m%, 0.1% reaction inhibitor, the reaction inhibitor is a solution with a content of 1-ethynyl-1-cyclohexanol of 99.8m / m%, 22% of ferrochrome particles with a particle size of 5um; 13% of 30um; 32% of 50um; 8.3% of polyvinyl alcohol; and 9% of pure water;

[0036] Component B comprises the following raw materials in parts by weight: 15.3% vinyl silicone oil with a viscosity of 250 cps, 0.1% platinum catalyst with a platinum content of 3000 ppm solution, ferrochrome particle size 5um 22%; 30um 13%; 50um 32%, polyvinyl alcohol 8.3%, pure water 9%, masterbatch 0.3%; the mass ratio of component A to component B is 1:1.

[0037] A method for preparing an insulating silicone potting compound with low dielectric constant and high thermal conductivity comprises the following steps:

[0038] S1 Preparation of component A:

[0039] According to the formula, the vinyl silicone oil, the hydrogen-containing silicone oil, the reaction inhibitor, the ferrochrome, the polyvinyl alcohol and the pure water in the component A are weighed respectively; the weighed pure water and the polyvinyl alcohol are placed in a planetary mixer with high-speed dispersion, and stirred for 60 minutes under vacuum and high temperature conditions until the polyvinyl alcohol is completely dissolved, and then the ferrochrome is added and stirred at high temperature for 20 minutes; then the vinyl silicone oil is added and the high-temperature vacuum stirring is continued for 60 minutes until the stirring is uniform; finally, the temperature is lowered to 40°C, the hydrogen-containing silicone oil and the reaction inhibitor are added and vacuum stirred for 20 minutes, and after stirring until uniformly dispersed, the component A is obtained; the planetary mixer is evacuated to -0.097Mpa, and the high temperature is 90°C.

[0040] S2 Preparation of component B:

[0041] According to the formula, the vinyl silicone oil, the platinum catalyst, the ferrochrome, the polyvinyl alcohol, the pure water and the masterbatch in the B component are weighed respectively; the weighed pure water and the polyvinyl alcohol materials are placed in a planetary mixer with high-speed dispersion, and stirred for 60 minutes under vacuum and high temperature conditions until the polyvinyl alcohol is completely dissolved, and then the ferrochrome is added and stirred at high temperature for 20 minutes, and then the vinyl silicone oil is added and stirred at high temperature and in vacuum for 60 minutes until the stirring is uniform, and finally the temperature is lowered to 40°C, and the platinum catalyst and the masterbatch are added and stirred in vacuum for 20 minutes, and after stirring until uniform dispersion, the B component is obtained. The planetary mixer is evacuated to -0.097Mpa, and the high temperature is 90°C.

[0042] The remaining contents of the parts not involved are the same as those of Example 1.

[0043] Example 3

[0044] A method for preparing an insulating silicone potting compound with low dielectric constant and high thermal conductivity, comprising component A and component B;

[0045] The invention comprises component A and component B; the component A comprises the following raw materials in weight percentage: 10% vinyl silicone oil, the viscosity of the vinyl silicone oil is 250cps, 2.6% hydrogen-containing silicone oil, the hydrogen content of the hydrogen-containing silicone oil is 0.36m / m%, 0.1% reaction inhibitor, the reaction inhibitor is a solution with a 1-ethynyl-1-cyclohexanol content of 99.8m / m%, 25% ferrochrome particles with a diameter of 5um, 21% 30um, and 24% 50um, 9.3% polyvinyl alcohol, and 8% pure water;

[0046] Component B comprises the following raw materials in parts by weight: 14% vinyl silicone oil with a viscosity of 250cps, 0.1% platinum catalyst with a platinum content of 3000ppm solution, ferrochrome particle size 5um 20%; 30um 16%; 50um 34%, polyvinyl alcohol 8%, pure water 8%, masterbatch 0.3%; the mass ratio of component A to component B is 1:1.

[0047] A method for preparing an insulating silicone potting compound with low dielectric constant and high thermal conductivity comprises the following steps:

[0048] S1 Preparation of component A:

[0049] According to the formula, the vinyl silicone oil, the hydrogen-containing silicone oil, the reaction inhibitor, the ferrochrome, the polyvinyl alcohol and the pure water in the component A are weighed respectively; the weighed pure water and the polyvinyl alcohol are placed in a planetary mixer with high-speed dispersion, and stirred for 80 minutes under vacuum and high temperature conditions until the polyvinyl alcohol is completely dissolved, and then the ferrochrome is added and stirred at high temperature for 25 minutes; then the vinyl silicone oil is added, and the high-temperature vacuum stirring is continued for 75 minutes until the stirring is uniform; finally, the temperature is lowered to 40°C, the hydrogen-containing silicone oil and the reaction inhibitor are added, and vacuum stirring is performed for 25 minutes, and after stirring until uniform dispersion, the component A is obtained; the planetary mixer is evacuated to -0.098Mpa, and the high temperature is 100°C.

[0050] S2 Preparation of component B:

[0051] According to the formula, the vinyl silicone oil, the platinum catalyst, the ferrochrome, the polyvinyl alcohol, the pure water and the masterbatch in the B component are weighed respectively; the weighed pure water and the polyvinyl alcohol materials are placed in a planetary mixer with high-speed dispersion, and stirred for 75 minutes under vacuum and high temperature conditions until the polyvinyl alcohol is completely dissolved, and then the ferrochrome is added and stirred at high temperature for 25 minutes, and then the vinyl silicone oil is added and stirred at high temperature and vacuum for 75 minutes until the stirring is uniform, and finally the temperature is lowered to 40°C, and the platinum catalyst and the masterbatch are added and stirred in vacuum for 25 minutes, and after stirring until uniform dispersion, the B component is obtained. The planetary mixer is evacuated to -0.098Mpa, and the high temperature is 110°C.

[0052] The remaining contents of the parts not involved are the same as those of Example 1.

[0053] Example 4

[0054] A method for preparing an insulating silicone potting compound with low dielectric constant and high thermal conductivity, comprising component A and component B;

[0055] The invention comprises component A and component B; the component A comprises the following raw materials in weight percentage: 20% vinyl silicone oil, the viscosity of the vinyl silicone oil is 100 cps, 2.6% hydrogen-containing silicone oil, the hydrogen content of the hydrogen-containing silicone oil is 0.1 m / m%, 0.5% reaction inhibitor, the reaction inhibitor is a solution with a 10 m / m% 1-ethynyl-1-cyclohexanol content, 25% ferrochrome particles with a diameter of 5 um, 13% 30 um, and 28% 50 um, 8% polyvinyl alcohol, and 3% pure water;

[0056] Component B comprises the following raw materials in parts by weight: 10% vinyl silicone oil with a viscosity of 100 cps, 0.5% platinum catalyst with a platinum content of 1000 ppm solution, ferrochrome particle size 5um 29%; 30um 16%; 50um 31%, 10% polyvinyl alcohol, 3% pure water, and 0.5% masterbatch; the mass ratio of component A to component B is 1:1.

[0057] A method for preparing an insulating silicone potting compound with low dielectric constant and high thermal conductivity comprises the following steps:

[0058] S1 Preparation of component A:

[0059] According to the formula, the vinyl silicone oil, the hydrogen-containing silicone oil, the reaction inhibitor, the ferrochrome, the polyvinyl alcohol and the pure water in the component A are weighed respectively; the weighed pure water and the polyvinyl alcohol are placed in a planetary mixer with high-speed dispersion, and stirred for 90 minutes under vacuum and high temperature conditions until the polyvinyl alcohol is completely dissolved, and then the ferrochrome is added and stirred at high temperature for 30 minutes; then the vinyl silicone oil is added and the high-temperature vacuum stirring is continued for 90 minutes until the stirring is uniform; finally, the temperature is lowered to 40°C, the hydrogen-containing silicone oil and the reaction inhibitor are added and vacuum stirred for 30 minutes, and after stirring until uniformly dispersed, the component A is obtained; the planetary mixer is evacuated to -0.1Mpa, and the high temperature is 120°C.

[0060] S2 Preparation of component B:

[0061] According to the formula, the vinyl silicone oil, the platinum catalyst, the ferrochrome, the polyvinyl alcohol, the pure water and the masterbatch in the B component are weighed respectively; the weighed pure water and the polyvinyl alcohol materials are placed in a planetary mixer with high-speed dispersion, and stirred for 90 minutes under vacuum and high temperature conditions until the polyvinyl alcohol is completely dissolved, and then the ferrochrome is added and stirred at high temperature for 30 minutes, and then the vinyl silicone oil is added and stirred at high temperature and in vacuum for 90 minutes until the stirring is uniform, and finally the temperature is lowered to 40°C, and the platinum catalyst and the masterbatch are added and stirred in vacuum for 30 minutes, and after stirring until uniform dispersion, the B component is obtained. The planetary mixer is evacuated to -0.1Mpa, and the high temperature is 120°C.

[0062] The remaining contents of the parts not involved are the same as those of Example 1.

[0063] Example 5

[0064] A method for preparing an insulating silicone potting compound with low dielectric constant and high thermal conductivity, comprising component A and component B;

[0065] It comprises component A and component B; component A comprises the following raw materials in weight percentage: 22% vinyl silicone oil, the viscosity of which is 1000cps, 2.6% hydrogen-containing silicone oil, the hydrogen content of which is 0.5m / m%, 0.1% reaction inhibitor, the reaction inhibitor being a solution containing 50m / m% 1-ethynyl-1-cyclohexanol, 13% ferrochrome particles of 5um, 13% 30um, 29% 50um, 12.3% polyvinyl alcohol, and 8% pure water;

[0066] Component B comprises the following raw materials in parts by weight: 22% vinyl silicone oil with a viscosity of 1000cps, 1% platinum catalyst with a platinum content of 5000ppm solution, 15% ferrochrome particle size of 5um; 16% 30um; 28% 50um, 11.7% polyvinyl alcohol, 6% pure water, and 0.3% masterbatch; the mass ratio of component A to component B is 1:1.

[0067] A method for preparing an insulating silicone potting compound with low dielectric constant and high thermal conductivity comprises the following steps:

[0068] S1 Preparation of component A:

[0069] According to the formula, the vinyl silicone oil, the hydrogen-containing silicone oil, the reaction inhibitor, the ferrochrome, the polyvinyl alcohol and the pure water in the component A are weighed respectively; the weighed pure water and the polyvinyl alcohol are placed in a planetary mixer with high-speed dispersion, and stirred for 80 minutes under vacuum and high temperature conditions until the polyvinyl alcohol is completely dissolved, and then the ferrochrome is added and stirred at high temperature for 25 minutes; then the vinyl silicone oil is added and the high-temperature vacuum stirring is continued for 80 minutes until the stirring is uniform; finally, the temperature is lowered to 40°C, the hydrogen-containing silicone oil and the reaction inhibitor are added and vacuum stirred for 25 minutes, and after stirring until uniformly dispersed, the component A is obtained; the planetary mixer is evacuated to -0.099Mpa, and the high temperature is 100°C.

[0070] S2 Preparation of component B:

[0071] According to the formula, the vinyl silicone oil, the platinum catalyst, the ferrochrome, the polyvinyl alcohol, the pure water and the masterbatch in the B component are weighed respectively; the weighed pure water and the polyvinyl alcohol materials are placed in a planetary mixer with high-speed dispersion, and stirred for 80 minutes under vacuum and high temperature conditions until the polyvinyl alcohol is completely dissolved, and then the ferrochrome is added and stirred at high temperature for 25 minutes, and then the vinyl silicone oil is added and stirred at high temperature and in vacuum for 70 minutes until the stirring is uniform, and finally the temperature is lowered to 40°C, and the platinum catalyst and the masterbatch are added and stirred in vacuum for 25 minutes, and after stirring until uniform dispersion, the B component is obtained. The planetary mixer is evacuated to -0.099Mpa, and the high temperature is 100°C.

[0072] The remaining contents of the parts not involved are the same as those of Example 1.

[0073] Comparative Example 1

[0074] The ferrochrome particle size is 5 μm, 59.3%. Other data not involved are the same as those in Example 1.

[0075] Comparative Example 2

[0076] The ferrochrome particle size is 30 μm, 59.3%, and other data not involved are the same as those in Example 1.

[0077] Comparative Example 3

[0078] The ferrochrome particle size is 50 μm, 59.3%, and other data not involved are the same as those in Example 1.

[0079] Comparative Example 4

[0080] The ferrochrome particle size is 5um 30%, 30um 29.3%, and other data not involved are the same as those in Example 1.

[0081] The potting glue prepared in the above Examples 1-5 and Comparative Examples 1-4 was experimented, and the viscosity of component A and component B was measured by a rotational viscometer method in accordance with GB / T 2794-2013, the vertical thermal conductivity was measured by a heat flow meter in accordance with GB / T 10295-2008, the dielectric constant 5G frequency was measured by a coaxial probe method in accordance with GB / T31838.2-2019, and the volume resistivity was tested by an insulation resistance tester in accordance with ASTM D257 and the volume resistivity was calculated to obtain the following data, as shown in Table 1.

[0082] Table 1

[0083]

[0084] By comparing Comparative Examples 1-4 with Example 1, it can be seen that when the chromium iron particle size is 5um, 30um, and 50um, the thermal conductivity is good. By comparing Examples 1-5, it can be seen that the potting glue of the present invention has low viscosity, excellent insulation, and a low dielectric constant, which can meet the needs.

[0085] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An insulating silicone potting compound with low dielectric constant and high thermal conductivity, characterized in that: The method comprises component A and component B; the component A comprises the following raw materials in weight percentage: 10-20% vinyl silicone oil, 2-3% hydrogen-containing silicone oil, 0.1-0.5% reaction inhibitor, 60-70% ferrochrome, 8-18% polyvinyl alcohol, and 3-10% pure water; The B component comprises the following raw materials in weight percentage: 10-20% vinyl silicone oil, 0.1-1% platinum catalyst, 60-80% ferrochrome, 9-19% polyvinyl alcohol, 3-10% pure water, and 0.1-0.5% masterbatch; the mass ratio of the A component to the B component is 1:

1.

2. The low dielectric constant and high thermal conductivity insulating silicone potting adhesive according to claim 1, characterized in that: The hydrogen content of the hydrogen-containing silicone oil is 0.1-0.5 m / m%.

3. The low dielectric constant and high thermal conductivity insulating silicone potting adhesive according to claim 1, characterized in that: The viscosity of the vinyl silicone oil is 100-1000 cps.

4. The low dielectric constant and high thermal conductivity insulating silicone potting adhesive according to claim 1, characterized in that: The reaction inhibitor is a solution containing 1-ethynyl-1-cyclohexanol in an amount of 10-99.8 m / m%.

5. The low dielectric constant and high thermal conductivity insulating silicone potting adhesive according to claim 1, characterized in that: The platinum content of the platinum catalyst is 1000-5000 ppm solution.

6. The method for preparing the insulating silicone potting compound with low dielectric constant and high thermal conductivity according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1 Preparation of component A: According to the formula, the vinyl silicone oil, the hydrogen-containing silicone oil, the reaction inhibitor, the ferrochrome, the polyvinyl alcohol and the pure water in the component A are weighed respectively; the weighed pure water and the polyvinyl alcohol are placed in a planetary mixer with high-speed dispersion, and stirred for 60-90 minutes under vacuum and high temperature conditions until the polyvinyl alcohol is completely dissolved, and then the ferrochrome is added and stirred at high temperature for 20-30 minutes; then the vinyl silicone oil is added and the high-temperature vacuum stirring is continued for 60-90 minutes until the stirring is uniform; finally, the temperature is lowered to 40° C., the hydrogen-containing silicone oil and the reaction inhibitor are added and stirred under vacuum for 20-30 minutes, and after stirring until the mixture is uniformly dispersed, the component A is obtained; S2 Preparation of component B: According to the formula, the vinyl silicone oil, the platinum catalyst, the ferrochrome, the polyvinyl alcohol, the pure water and the masterbatch in the B component are weighed respectively; the weighed pure water and the polyvinyl alcohol materials are placed in a planetary mixer with high-speed dispersion, and stirred for 60-90 minutes under vacuum and high temperature conditions until the polyvinyl alcohol is completely dissolved, and then the ferrochrome is added and stirred at high temperature for 20-30 minutes, and then the vinyl silicone oil is added and stirred at high temperature and in vacuum for 60-90 minutes until the stirring is uniform, and finally the temperature is lowered to 40°C, and the platinum catalyst and the masterbatch are added and stirred in vacuum for 20-30 minutes, and after stirring until uniformly dispersed, the B component is obtained.

7. The insulating silicone potting adhesive with low dielectric constant and high thermal conductivity according to claim 6, wherein the high temperature is 90-120°C.

8. The low dielectric constant and high thermal conductivity insulating silicone potting adhesive according to claim 6, characterized in that: The planetary mixer was evacuated to -0.097 to -0.1 MPa.

9. The method for preparing the insulating silicone potting compound with low dielectric constant and high thermal conductivity according to claim 6, characterized in that: The stirring speed of the planetary mixer is 500-2000 rpm.

10. The method for using the low dielectric constant and high thermal conductivity insulating silicone potting adhesive according to claim 6, characterized in that: The component A and the component B are compounded in a weight ratio of 1:1, stirred evenly, and cured at 60° C. for 2-4 hours or at room temperature for 24-48 hours.

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