Preparation method of epoxy resin pouring sealant

Abstract

The application provides a preparation method of an epoxy resin pouring sealant, comprising the following steps: S1. preparing an impact-resistant agent by mixing 3-aminopropylpentamethyldisiloxane, tetrahydrophthalic acid diglycidyl ester, deionized water and N,N-dimethylformamide; S2. preparing a sol by mixing titanium tetrachloride, rhenium pentachloride and deionized water; S3. preparing titanium-rhenium oxide by mixing the sol obtained in the step S2 with fumed white carbon black to prepare a filler; S4. mixing epoxy resin, a diluent, the impact-resistant agent obtained in the step S1 and the filler obtained in the step S3, and then adding a curing agent and an accelerator after stirring for 2-3 hours at 30-35 DEG C, and stirring for 30-40 minutes at 25-30 DEG C to obtain the epoxy resin pouring sealant. The epoxy resin pouring sealant prepared by the application has good impact resistance, weather resistance and corrosion resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to a pouring sealant, in particular to an epoxy resin pouring sealant and a preparation method thereof. BACKGROUND

[0002] In the electronic industry, electronic components or assembly parts need to be poured and sealed to isolate them from the outside world in order to protect these components from external environmental factors (such as moisture, dust, chemicals, etc.), so pouring sealant is widely used in the pouring sealing of electronic equipment. At present, pouring sealant can be divided into epoxy resin (EP) pouring sealant, silicone (SR) pouring sealant and polyurethane (PU) pouring sealant according to its main components, and each of these pouring sealants has advantages and disadvantages.

[0003] The epoxy resin pouring sealant has high hardness, good insulation performance, waterproof performance and corrosion resistance, but it is brittle and does not perform well in impact resistance and weather resistance; the silicone pouring sealant has good shock resistance, electrical performance, waterproof performance and temperature resistance, but its mechanical performance is general; the polyurethane pouring sealant has good elasticity, mildew resistance, insulation performance and shock resistance, but it has low hardness and general strength. With the rapid development of electronic technology, electronic equipment is developing towards miniaturization, light weight and high performance, and the requirements for the performance of pouring sealant are also increasing. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a preparation method of an epoxy resin pouring sealant, which has good impact resistance, weather resistance and corrosion resistance.

[0005] To solve the above technical problems, the technical scheme of the present application is as follows:

[0006] A preparation method of an epoxy resin pouring sealant, comprising the following steps:

[0007] S1. Mix 3-aminopropylpentamethyldisiloxane, tetrahydrophthalic acid diglycidyl ester, deionized water and N,N-dimethylformamide, adjust the pH value to 9.5 with sodium hydroxide aqueous solution, heat to 70℃, and keep the reaction for 6-8 hours to obtain a reaction product, filter the reaction product to obtain a filter residue, wash the filter residue with deionized water until the surface is neutral, and dry the filter residue in a vacuum drying oven to obtain an impact resistance agent;

[0008] S2. Add titanium tetrachloride to deionized water and stand for 10 hours to obtain liquid one, add rhenium pentachloride to deionized water and stand for 10 hours to obtain liquid two, add liquid two dropwise to liquid one, adjust the pH value to 7 with ammonia water, and stir at 70℃ for 1-2 hours to obtain a sol;

[0009] S3. The sol obtained in step S2 is aged at room temperature for 12 hours to obtain a gel, the gel is washed with deionized water and anhydrous ethanol for 5 times respectively and then is placed in a vacuum drying box to be dried to obtain a dry gel, the dry gel is transferred into a muffle furnace, the temperature is increased to 550 DEG C and then is kept for 2-3 hours, and the titanium-rhenium oxide is obtained after natural cooling to room temperature, the titanium-rhenium oxide is mixed with fumed silica, is ground and then is passed through an 800 mesh sieve to obtain a filler;

[0010] S4. The epoxy resin, the diluent, the impact-resistant agent obtained in step S1 and the filler obtained in step S3 are mixed, and after stirring at 30-35 DEG C for 2-3 hours, the curing agent and the accelerator are added, and stirring is carried out at 25-30 DEG C for 30-40 minutes to obtain the epoxy resin pouring sealant.

[0011] Further, in step S1, the proportions of 3-aminopropylpentamethyldisiloxane, tetrahydrophthalic acid diglycidyl ester, deionized water and N,N-dimethylformamide are 3g:4g:50mL:50mL, the concentration of the aqueous sodium hydroxide solution is 0.1mol / L, the drying temperature is 50 DEG C, and the drying time is 12 hours.

[0012] Further, in step S2, the mass concentration of titanium tetrachloride in liquid one is 20%, the mass concentration of rhenium pentachloride in liquid two is 2%, the volume ratio of liquid two to liquid one is 1:10, the mass concentration of ammonia water is 10%, and the stirring speed is 500-600rpm.

[0013] Further, in step S3, the drying temperature is 70 DEG C, the drying time is 12 hours, the temperature increasing speed of the muffle furnace is 5 DEG C / min, and the weight ratio of the titanium-rhenium oxide to the fumed silica is 1:1.

[0014] Further, in step S4, the proportions of the epoxy resin, the diluent, the impact-resistant agent obtained in step S1, the filler obtained in step S3, the curing agent and the curing accelerator are 42-48 parts:8-12 parts:3-5 parts:40-44 parts:12-15 parts:1-1.5 parts by weight.

[0015] Further, in step S4, the epoxy resin is epoxy resin E44.

[0016] Further, in step S4, the diluent is trimethylolpropane triglycidyl ether.

[0017] Further, in step S4, the curing agent is methylhexahydrophthalic anhydride.

[0018] Further, in step S4, the curing accelerator is 2-methylimidazole.

[0019] Further, the stirring speed in step S4 is 600-800 rpm.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] 1) The present application prepares an impact-resistant agent by addition reaction of 3-aminopropyl pentamethyl disiloxane and tetrahydrophthalic acid diglycidyl ester, which can play a good toughening effect, improve the cross-linking property of the epoxy resin system, and improve the impact resistance, corrosion resistance and heat resistance of the epoxy resin pouring sealant.

[0022] 2) Titanium dioxide has good ultraviolet absorption performance, but the absorption wavelength range is relatively narrow and the absorption rate is not high. To this end, the present application prepares titanium-rhenium oxide by ion doping of rhenium ions into titanium dioxide using titanium tetrachloride as a titanium source and rhenium pentachloride as a rhenium source. The introduction of rhenium widens the absorption wavelength range of titanium dioxide, improves the absorption rate, absorption activity and stability of titanium dioxide to ultraviolet light, so that the titanium-rhenium oxide can effectively improve the weather resistance of the epoxy resin pouring sealant. DETAILED DESCRIPTION

[0023] The present application will be described in detail below with specific examples. The illustrative examples of the present application and their descriptions are used to explain the present application, but are not intended to limit the present application.

[0024] Example 1, the epoxy resin pouring sealant is prepared according to the following steps:

[0025] S1. 3-aminopropyl pentamethyl disiloxane, tetrahydrophthalic acid diglycidyl ester, deionized water and N,N-dimethylformamide are mixed in a ratio of 3g:4g:50mL:50mL, the pH value is adjusted to 9.5 with a 0.1mol / L sodium hydroxide aqueous solution, and then heated to 70℃, and the reaction is kept for 7 hours to obtain a reaction product. The reaction product is filtered to obtain a filter residue, which is washed with deionized water until the surface is neutral, and then dried in a vacuum drying oven at 50℃ for 12 hours to obtain an impact-resistant agent;

[0026] S2. Titanium tetrachloride is added to deionized water and left to stand for 10 hours to obtain a liquid one with a mass concentration of 20% titanium tetrachloride. Rhenium pentachloride with a mass concentration of 2% is added to deionized water and left to stand for 10 hours to obtain a liquid two. Liquid two is added dropwise to liquid one in a volume ratio of 1:10, and then the pH value is adjusted to 7 with 10% ammonia water, and then stirred at 70℃ and 500rpm for 1.5 hours to obtain a sol;

[0027] S3. The sol obtained in step S2 was aged at room temperature for 12 hours to obtain a gel, the gel was washed with deionized water and anhydrous ethanol for 5 times respectively and then was placed in a vacuum drying oven to be dried at 70℃ for 12 hours to obtain a dry gel, the dry gel was transferred into a muffle furnace, heated to 550℃ at a heating rate of 5℃ / min and then was kept for 2.5 hours, and was naturally cooled to room temperature to obtain titanium-rhenium oxide, the titanium-rhenium oxide was mixed with fumed silica in a weight ratio of 1:1, and the mixture was ground and then was passed through an 800 mesh sieve to obtain a filler;

[0028] S4. The epoxy resin E44, trimethylolpropane triglycidyl ether, the impact modifier obtained in step S1 and the filler obtained in step S3 were mixed, and then was stirred at a speed of 700 rpm and at a temperature of 33℃ for 2.5 hours, and then methylhexahydrophthalic anhydride and 2-methylimidazole were added and stirred at a speed of 700 rpm and at a temperature of 28℃ for 35 minutes to obtain an epoxy resin pouring sealant, wherein the epoxy resin pouring sealant contained, by weight, 45 parts of epoxy resin E44, 10 parts of trimethylolpropane triglycidyl ether, 4 parts of the impact modifier obtained in step S1, 42 parts of the filler obtained in step S3, 14 parts of methylhexahydrophthalic anhydride and 1.3 parts of 2-methylimidazole.

[0029] Example 2, an epoxy resin pouring sealant was prepared according to the following steps:

[0030] S1. 3-Aminopropylpentamethyldisiloxane, tetrahydrophthalic acid diglycidyl ester, deionized water and N,N-dimethylformamide were mixed in a ratio of 3g:4g:50mL:50mL, and then was heated to 70℃ after the pH value was adjusted to 9.5 by using a 0.1 mol / L sodium hydroxide aqueous solution, and was kept for 6 hours to obtain a reaction product, the reaction product was filtered to obtain a filter residue, the filter residue was washed with deionized water until the surface was neutral, and then was placed in a vacuum drying oven to be dried at 50℃ for 12 hours to obtain an impact modifier;

[0031] S2. Titanium tetrachloride was added into deionized water to stand for 10 hours to obtain liquid one with a mass concentration of 20% of titanium tetrachloride, and rhenium pentachloride with a mass concentration of 2% was added into deionized water to stand for 10 hours to obtain liquid two, liquid two was added dropwise into liquid one in a volume ratio of 1:10, and then was stirred at a speed of 600 rpm and at a temperature of 70℃ for 1 hour after the pH value was adjusted to 7 by using a 10% ammonia water to obtain a sol;

[0032] S3. The sol obtained in step S2 was aged at room temperature for 12 hours to obtain a gel, the gel was washed with deionized water and anhydrous ethanol for 5 times respectively and then was placed in a vacuum drying oven to be dried at 70℃ for 12 hours to obtain a dry gel, the dry gel was transferred into a muffle furnace, heated to 550℃ at a heating rate of 5℃ / min and then was kept for 2.5 hours, and was naturally cooled to room temperature to obtain titanium-rhenium oxide, the titanium-rhenium oxide was mixed with fumed silica in a weight ratio of 1:1, and the mixture was ground and then was passed through an 800 mesh sieve to obtain a filler;

[0033] S4. Mixing epoxy resin E44, trimethylolpropane triglycidyl ether, the impact modifier obtained in step S1, the filler obtained in step S3, after stirring at 800 rpm for 2 hours at 30℃, adding methylhexahydrophthalic anhydride, 2-methylimidazole, stirring at 800 rpm for 30 minutes at 25℃ to obtain the epoxy resin pouring sealant, according to the weight fraction, epoxy resin E44 44 parts, trimethylolpropane triglycidyl ether 8 parts, the impact modifier obtained in step S1 3 parts, the filler obtained in step S3 41 parts, methylhexahydrophthalic anhydride 12 parts, 2-methylimidazole 1 part.

[0034] Example 3, the epoxy resin pouring sealant is prepared according to the following steps:

[0035] S1. Mixing 3-aminopropyl pentamethyldisiloxane, tetrahydrophthalic acid diglycidyl ester, deionized water, N,N-dimethylformamide according to the ratio of 3g:4g:50mL:50mL, adjusting the pH value to 9.5 with 0.1mol / L sodium hydroxide aqueous solution and heating to 70℃, and then reacting for 7 hours to obtain a reaction product, filtering the reaction product to obtain a filter residue, washing the filter residue with deionized water until the surface is neutral, and drying in a vacuum drying oven at 50℃ for 12 hours to obtain an impact modifier;

[0036] S2. Adding titanium tetrachloride to deionized water and standing for 10 hours to obtain liquid one with a mass concentration of 20% titanium tetrachloride, adding rhenium pentachloride with a mass concentration of 2% to deionized water and standing for 10 hours to obtain liquid two, adding liquid two dropwise to liquid one according to a volume ratio of 1:10, adjusting the pH value to 7 with 10% ammonia water, and then stirring at 600 rpm at 70℃ for 1.5 hours to obtain a sol;

[0037] S3. Aging the sol obtained in step S2 at room temperature for 12 hours to obtain a gel, washing the gel with deionized water and anhydrous ethanol 5 times respectively, and then drying in a vacuum drying oven at 70℃ for 12 hours to obtain a dry gel, placing the dry gel into a muffle furnace, heating to 550℃ at a heating rate of 5℃ / min, and then maintaining for 2.5 hours, and naturally cooling to room temperature to obtain titanium-rhenium oxide, mixing the titanium-rhenium oxide with fumed silica according to a weight ratio of 1:1, grinding, and then passing through an 800 mesh sieve to obtain a filler;

[0038] S4. The epoxy resin E44, trimethylolpropane triglycidyl ether, the impact modifier obtained in step S1, the filler obtained in step S3 were mixed, and after stirring at 600 rpm for 3 hours at 32℃, methylhexahydrophthalic anhydride and 2-methylimidazole were added, and stirring was carried out at 600 rpm for 38 minutes at 27℃ to obtain an epoxy resin pouring sealant, wherein the epoxy resin E44 was 42 parts, the trimethylolpropane triglycidyl ether was 9 parts, the impact modifier obtained in step S1 was 5 parts, the filler obtained in step S3 was 44 parts, the methylhexahydrophthalic anhydride was 13 parts, and the 2-methylimidazole was 1.5 parts by weight.

[0039] Example 4, an epoxy resin pouring sealant was prepared according to the following steps:

[0040] S1. 3-Aminopropylpentamethyldisiloxane, tetrahydrophthalic acid diglycidyl ester, deionized water, and N,N-dimethylformamide were mixed in a ratio of 3g:4g:50mL:50mL, and after adjusting the pH value to 9.5 with a 0.1 mol / L sodium hydroxide aqueous solution, heating was carried out to 70℃, and reaction was carried out for 8 hours to obtain a reaction product. The reaction product was suction filtered to obtain a filter residue, the filter residue was washed with deionized water until the surface was neutral, and the filter residue was placed in a vacuum drying oven and dried at 50℃ for 12 hours to obtain an impact modifier;

[0041] S2. Titanium tetrachloride was added to deionized water and allowed to stand for 10 hours to obtain liquid one with a mass concentration of 20% titanium tetrachloride, and rhenium pentachloride with a mass concentration of 2% was added to deionized water and allowed to stand for 10 hours to obtain liquid two. Liquid two was added dropwise to liquid one in a volume ratio of 1:10, and after adjusting the pH value to 7 with a 10% ammonia water, stirring was carried out at 500 rpm for 2 hours at 70℃ to obtain a sol;

[0042] S3. The sol obtained in step S2 was aged at room temperature for 12 hours to obtain a gel, the gel was washed with deionized water and anhydrous ethanol 5 times respectively, and then placed in a vacuum drying oven and dried at 70℃ for 12 hours to obtain a dry gel. The dry gel was transferred into a muffle furnace, and heated to 550℃ at a heating rate of 5℃ / min, and then incubated for 3 hours. The temperature was naturally cooled to room temperature to obtain titanium-rhenium oxide. The titanium-rhenium oxide and fumed silica were mixed in a weight ratio of 1:1, ground, and then sieved through an 800 mesh sieve to obtain a filler;

[0043] S4. The epoxy resin E44, trimethylolpropane triglycidyl ether, the impact modifier obtained in step S1, and the filler obtained in step S3 were mixed, and then methylhexahydrophthalic anhydride and 2-methylimidazole were added after stirring at 600 rpm and 35℃ for 3 hours to obtain an epoxy resin pouring sealant, wherein the epoxy resin pouring sealant was prepared by using 48 parts of epoxy resin E44, 12 parts of trimethylolpropane triglycidyl ether, 4.5 parts of the impact modifier obtained in step S1, 40 parts of the filler obtained in step S3, 15 parts of methylhexahydrophthalic anhydride, and 1.2 parts of 2-methylimidazole.

[0044] Comparative Example 1

[0045] Different from Example 1: step S2 was deleted, and step S3 was changed to: titanium dioxide and fumed silica were mixed in a weight ratio of 1:1, and then the mixture was ground and sieved through an 800-mesh sieve to obtain a filler; that is, the titanium-rare earth oxide in the filler used in step S4 was replaced by titanium dioxide.

[0046] Comparative Example 2

[0047] Different from Example 1: steps S2 and S3 were deleted, and the filler used in step S4 was replaced by 800-mesh fumed silica; that is, the titanium-rare earth oxide was not included in the filler.

[0048] Comparative Example 3

[0049] Different from Example 1: step S1 was deleted, and no impact modifier was added in step S4.

[0050] Experimental Example 1: Impact Resistance Test

[0051] The epoxy resin pouring sealants prepared in Examples 1-4 and Comparative Example 3 were respectively injected into glass products with a size of 25 mm x 25 mm x 3 mm, and then the glass products were placed in an oven for curing at 90℃ for 0.5 hours and at 120℃ for 2 hours to obtain cured products. The impact strength of the cured products was tested according to the GB / T 6328-2021 standard.

[0052] The higher the impact strength, the better the impact resistance. The test results are shown in Table 1.

[0053]

[0054] Table 1

[0055] As can be seen from Table 1, the impact strength of Examples 1-4 of the present application is relatively high, indicating that the epoxy resin pouring sealant prepared by the present application has good impact resistance. The preparation steps of Comparative Example 3 are different from those of Example 1, and the impact strength of Comparative Example 2 is significantly lower than that of Example 1, indicating that the impact modifier prepared by the present application can effectively improve the impact resistance of the epoxy resin pouring sealant.

[0056] Experimental Example Two: Corrosion Resistance Test

[0057] The epoxy resin potting adhesive prepared in Example 1-4 and Comparative Example 2-3 was applied to the surface of a PET sheet at a coating amount of 15 g / m2, and then another PET sheet was covered on the adhesive, and a flat press was used to press the composite at a pressure of 0.5 MPa for 5 minutes, and then placed in an oven for curing at 90°C for 0.5 hours and at 120°C for 2 hours, and then taken out to obtain a test sample after cooling to room temperature. According to the test method of ASTM-G85-A5, the test sample was cut into a test piece of 100 mm x 100 mm, and the test piece was placed in a salt spray resistance test instrument, and the time when the test piece appeared blistering, powdering or peeling was recorded as the salt spray resistance time.

[0058] The longer the salt spray resistance time, the better the corrosion resistance. The test results are shown in Table 2:

[0059]

[0060] Table 2

[0061] As can be seen from Table 2, the salt spray resistance time of Examples 1-4 of the present application is longer, indicating that the epoxy resin potting adhesive prepared by the present application has good corrosion resistance. The preparation steps of Comparative Examples 2-3 are different from Example 1, and compared with Example 1, the salt spray resistance time of Comparative Example 3 is significantly shortened, indicating that the impact resistance agent prepared by the present application can improve the corrosion resistance of the epoxy resin potting adhesive; the salt spray resistance time of Comparative Example 2 is also shortened, indicating that the titanium-rhenium oxide prepared by the present application can also improve the corrosion resistance of the epoxy resin potting adhesive.

[0062] Experimental Example Three: Weather Resistance Test

[0063] The epoxy resin potting adhesive prepared in Example 1-4 and Comparative Example 1-2 was injected into a glass product of 25 mm x 25 mm x 3 mm, and then the glass product was placed in an oven, cured at 90°C for 0.5 hours and at 120°C for 2 hours to obtain a cured product, and then the cured product was taken out and subjected to artificial accelerated aging treatment according to the GB / T 14522-2008 standard, with each cycle period parameter being: UVB-313 ultraviolet irradiation plus temperature 60°C for 4 hours, ultraviolet irradiation plus spraying water for 4 hours, and the cycle period being 168 hours; the impact strength of the cured product before and after artificial accelerated aging treatment was tested according to the GB / T 6328-2021 standard, and was recorded as the initial impact strength and the impact strength after aging, respectively.

[0064] The test results are shown in Table 3:

[0065]

[0066] Table 3

[0067] As can be seen from Table 3, the impact strength after aging of Examples 1-4 of the present application is higher, indicating that the epoxy resin potting adhesive prepared by the present application has good weather resistance. The preparation steps of Comparative Examples 1-2 are different from Example 1, and the impact strength after aging of Comparative Example 2 is significantly lower than that of Example 1, indicating that the titanium-rhenium oxide prepared by the present application can effectively improve the weather resistance of the epoxy resin potting adhesive; the impact strength after aging of Comparative Example 1 decreases slightly, indicating that the titanium-rhenium oxide prepared by the present application has a better effect on improving the weather resistance of the epoxy resin potting adhesive than the titanium dioxide without doping rhenium ions.

[0068] The above examples are only illustrative of the principles and effects of the present application, and are not intended to limit the present application. Any person skilled in the art can modify or change the above examples without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed by the present application shall be covered by the claims of the present application.

Claims

1. A method for preparing an epoxy resin potting compound, characterized by: The method comprises the following steps: S1. Mixing 3-aminopropyl pentamethyldisiloxane, tetrahydrophthalic acid diglycidyl ester, deionized water and N,N-dimethylformamide, adjusting pH value to 9.5 with sodium hydroxide aqueous solution, heating to 70℃, and keeping for 6-8 hours to obtain a reaction product, filtering the reaction product to obtain filter residue, washing the filter residue with deionized water until the surface is neutral, and drying in a vacuum drying oven to obtain an impact modifier; S2. Adding titanium tetrachloride into deionized water and standing for 10 hours to obtain liquid one, adding rhenium pentachloride into deionized water and standing for 10 hours to obtain liquid two, adding liquid two into liquid one drop by drop, adjusting pH value to 7 with ammonia water, and stirring at 70℃ for 1-2 hours to obtain a sol; S3. Aging the sol obtained in step S2 at room temperature for 12 hours to obtain a gel, washing the gel with deionized water and anhydrous ethanol for 5 times respectively, and drying in a vacuum drying oven to obtain a dry gel, transferring the dry gel into a muffle furnace, heating to 550℃, keeping for 2-3 hours, and naturally cooling to room temperature to obtain titanium-rhenium oxide, mixing the titanium-rhenium oxide with fumed silica, grinding, and passing through an 800 mesh sieve to obtain a filler; S4. Mixing epoxy resin, diluent, the impact modifier obtained in step S1 and the filler obtained in step S3, stirring at 30-35℃ for 2-3 hours, adding a curing agent and an accelerator, and stirring at 25-30℃ for 30-40 minutes to obtain an epoxy resin pouring sealant.

2. The method for preparing an epoxy resin potting compound according to claim 1, characterized in that: In the step S1, the ratio of 3-aminopropyl pentamethyldisiloxane, tetrahydrophthalic acid diglycidyl ester, deionized water and N,N-dimethylformamide is 3g:4g:50mL:50mL, the concentration of sodium hydroxide aqueous solution is 0.1mol / L, the drying temperature is 50℃, and the drying time is 12 hours.

3. The method for preparing an epoxy resin potting compound according to claim 1, characterized in that: In the step S2, the mass concentration of titanium tetrachloride in the liquid one is 20%, the mass concentration of rhenium pentachloride in the liquid two is 2%, the volume ratio of the liquid two to the liquid one is 1:10, the mass concentration of ammonia water is 10%, and the stirring speed is 500-600rpm.

4. The method for preparing an epoxy resin potting compound according to claim 1, characterized in that: In the step S3, the drying temperature is 70℃, the drying time is 12 hours, the heating speed of the muffle furnace is 5℃ / min, and the weight ratio of the titanium-rhenium oxide to the fumed silica is 1:

1.

5. The method for preparing an epoxy resin potting compound according to claim 1, characterized in that: In the step S4, the epoxy resin is 42-48 parts by weight, the diluent is 8-12 parts by weight, the impact modifier obtained in step S1 is 3-5 parts by weight, the filler obtained in step S3 is 40-44 parts by weight, the curing agent is 12-15 parts by weight, and the curing accelerator is 1-1.5 parts by weight.

6. The method for preparing an epoxy resin potting compound according to claim 1, characterized in that: In the step S4, the epoxy resin is epoxy resin E44.

7. The method for preparing an epoxy resin potting compound according to claim 1, characterized in that: In the step S4, the diluent is trimethylolpropane triglycidyl ether.

8. The method for preparing an epoxy resin potting compound according to claim 1, characterized in that: In the step S4, the curing agent is methylhexahydrophthalic anhydride.

9. The method for preparing an epoxy resin potting compound according to claim 1, characterized in that: In the step S4, the curing accelerator is 2-methylimidazole.

10. The method for preparing an epoxy resin potting compound according to claim 1, characterized in that: In the step S4, the stirring speed is 600-800rpm.

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