Durable liquid silica gel and preparation method thereof

Abstract

The invention relates to the field of silica gel, in particular to durable liquid silica gel and a preparation method thereof.The liquid silica gel is prepared from, by weight, 60-100 parts of hydroxyl-terminated polysiloxane, 16-32 parts of modifier, 3-8 parts of cross-linking agent, 0.5-2 parts of catalyst and 1-5 parts of stabilizer. The durable liquid silica gel is prepared, the liquid silica gel is condensed type liquid silica gel, hydroxyl-terminated polysiloxane serves as a main material, and besides a cross-linking agent, a catalyst and a stabilizer, a modifier is further added, so that the strength and hardness of the obtained silica gel are well improved, in addition, the high temperature resistance of the silica gel is further improved, and the service life of the silica gel is prolonged. Therefore, the durable usability is enhanced.

Description

Technical Field

[0001] The invention relates to the field of silica gel, and in particular to a durable liquid silica gel and a preparation method thereof. Background Art

[0002] Liquid Silicone Rubber (LSR) is a high-purity, two-component, fluid silicone material with unique physical and chemical properties, which makes it widely used in many fields. Compared with other types of silicone, liquid silicone generally does not require complex and large-scale processing equipment, and can be processed by coating, injection, extrusion and other methods, and can be vulcanized and formed at room temperature or under heating conditions. Compared with hot-vulcanized silicone materials, the processing processes such as mixing, mixing with vulcanizing agents, tableting, and post-vulcanization can be omitted, saving energy and reducing manpower input, with high production efficiency, short processing cycle and low processing cost. At present, liquid silicone has been increasingly widely used in the fields of biomedicine, aerospace, electronic components, automotive parts, sealing and filling materials, and clothing.

[0003] With the increasing requirements for material performance, a single liquid silicone material is difficult to meet the requirements of production and application. Therefore, in the past few decades, researchers have conducted a lot of modification research on liquid silicone materials. Gradually developed a variety of functional liquid silicones, such as thermal conductive liquid silicone, conductive liquid silicone, flame retardant liquid silicone, heat resistant liquid silicone, wave absorbing silicone and other special or functional silicones. Liquid silicone has excellent performance and simple processing conditions, which has attracted more and more attention and applications, and the demand for it is also increasing. Liquid silicone is in an era of rapid development. Liquid silicone is widely used in the potting and bonding of electronic components due to its excellent high and low temperature performance and electrical insulation performance. Its reaction without volatilization and low shrinkage after curing have won the favor of the majority of users. However, the existing liquid silicone has the defects of insufficient strength and hardness after curing, resulting in poor durability. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a durable liquid silicone and a preparation method thereof.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] In a first aspect, the present invention discloses a durable liquid silicone, which comprises, by weight:

[0007] 60-100 parts of terminal hydroxyl polysiloxane, 16-32 parts of modifier, 3-8 parts of crosslinking agent, 0.5-2 parts of catalyst and 1-5 parts of stabilizer.

[0008] Preferably, the hydroxyl-terminated polysiloxane is hydroxyl-terminated polydimethylsiloxane (HTPDMS), with a weight average molecular weight of 2200-3600, a hydroxyl molar content of 0.7%-1.8%, and a viscosity of 100-150 mm 2 / s.

[0009] Preferably, the crosslinking agent is one of methyl orthosilicate, ethyl orthosilicate, methyltrimethoxysilane, vinyltrimethoxysilane, and methyltri(methylisobutylketoxime)silane.

[0010] Preferably, the catalyst is an organic tin catalyst, specifically including one of stannous octoate, dibutyltin dilaurate, and dibutyltin oxide.

[0011] Preferably, the stabilizer is one of polyethylene glycol, ethylene glycol monoethyl ether, propylene glycol diacetate, and ethylene glycol vinyl ether.

[0012] Preferably, the preparation method of the modifier comprises:

[0013] S1. Add vinyl silicone oil and 3-amino-5-mercapto-1,2,4-triazole into carbon tetrachloride, fully disperse, then add photosensitizer, stir for 0.6-1.8h under ultraviolet light, then remove the solvent under reduced pressure, wash with water and dry to obtain modified silicone oil;

[0014] S2, adding nano-scale aluminum nitride powder to anhydrous ethanol, reflux for 2-4 hours, filter and dry to obtain active aluminum nitride; adding active aluminum nitride to thionyl chloride, stirring at 60-70° C. for 8-12 hours, filter and dry to obtain aluminum nitride chloride;

[0015] S3. Add the modified silicone oil to toluene, stir thoroughly, then add aluminum nitride chloride, stir thoroughly again, then add a few drops of triethylamine, stir for 6-12 hours, after the treatment is completed, remove the solvent by rotary evaporation, and obtain modified aluminum nitride after drying.

[0016] Preferably, in S1, the weight average molecular weight of the vinyl silicone oil is 1500-2500, the molar content of vinyl is 3.2%-5.8%, and the boiling point is 162-166° C. More preferably, the weight average molecular weight of the vinyl silicone oil is 2000, and the molar content of vinyl is 4.6%.

[0017] Preferably, in S1, the mass volume ratio of vinyl silicone oil, 3-amino-5-mercapto-1,2,4-triazole and carbon tetrachloride is 10 g:(0.93-1.86) g:(60-100) mL.

[0018] Preferably, in S1, the photosensitizer is benzoin dimethyl ether or benzoin diethyl ether, and the amount of the photosensitizer added is 0.6%-1.2% of the mass of the vinyl silicone oil; the wavelength of the ultraviolet light is 365nm, and the intensity is 80-160mW / cm 2 .

[0019] Preferably, in S2, the particle size of the nano-scale aluminum nitride powder is 100-200 nm, and the mass ratio of the nano-scale aluminum nitride powder to anhydrous ethanol is 1 g: (10-20) mL.

[0020] Preferably, in S2, the mass volume ratio of activated aluminum nitride to thionyl chloride is 1 g:(20-40) mL.

[0021] Preferably, in S3, the mass volume ratio of modified silicone oil, aluminum nitride chloride and toluene is 1 g: (0.37-0.74) g: (30-60) mL.

[0022] Preferably, in S3, the amount of triethylamine added is 0.04%-0.1% of the mass of the modified silicone oil.

[0023] In a second aspect, the present invention discloses a method for preparing a durable liquid silicone, comprising the following steps:

[0024] Step 1, adding the modifier into the hydroxy-terminated polysiloxane, and stirring well to obtain a mixture A;

[0025] Step 2, mixing the crosslinking agent, the catalyst and the stabilizer, and stirring them thoroughly to obtain a mixture B;

[0026] Step 3, adding mixed material B to mixed material A, stirring evenly, injecting into a mold, first degassing, and then curing in the air and demolding to obtain the liquid silicone.

[0027] The beneficial effects of the present invention are:

[0028] 1. The present invention prepares a durable liquid silicone, which is a condensation liquid silicone. The main ingredient is terminal hydroxyl polysiloxane. In addition to a cross-linking agent, a catalyst and a stabilizer, a modifier is added to improve the strength and hardness of the obtained silicone. In addition, its high temperature resistance is improved, thereby enhancing durable use.

[0029] 2. The modifier of the present invention is obtained by modifying nano-scale aluminum nitride powder. The aluminum nitride powder has excellent hardness, electrical insulation and heat resistance. The specific modification process includes: placing the nano-powder in ethanol for activation treatment, and then using thionyl chloride for chlorination treatment to obtain aluminum nitride chloride; using the click chemistry reaction of the thiol-ethylene of vinyl silicone oil and 3-amino-5-mercapto-1,2,4-triazole to obtain a modified silicone oil containing an amino group, a thioether group and a triazole group; using the principle that the amino group in the modified silicone oil and the acyl chloride group on the surface of the aluminum nitride chloride combine to form an amide, thereby obtaining a coated modified aluminum nitride powder.

[0030] 3. The modifier is based on aluminum nitride as the core matrix, and the surface is silicone oil coated with a large number of amide groups, thioether groups and triazole groups. It has strong compatibility with terminal hydroxyl polysiloxane. After testing, it was found that the enhancement of the strength, hardness and high temperature resistance of the overall liquid silicone is better than traditional inorganic or organic fillers. DETAILED DESCRIPTION

[0031] In order to better understand the above technical scheme, the exemplary embodiments of the present invention are described in more detail below. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0032] The present invention will be further described below in conjunction with the following examples.

[0033] Example 1

[0034] A long-lasting liquid silicone comprising, by weight:

[0035] 80 parts of terminal hydroxyl polysiloxane, 24 parts of modifier, 4 parts of crosslinking agent, 1.3 parts of catalyst and 2 parts of stabilizer.

[0036] The hydroxyl-terminated polysiloxane is hydroxyl-terminated polydimethylsiloxane (HTPDMS) with a weight average molecular weight of 2800, a hydroxyl molar content of 1.2%, and a viscosity of 132 mm 2 / s; the crosslinking agent is tetraethyl orthosilicate; the catalyst is dibutyltin dilaurate; and the stabilizer is polyethylene glycol PEG-600.

[0037] The preparation method of the modifier comprises:

[0038] S1. Add vinyl silicone oil (Mw: 2000, Et%: 4.6mol%) and 3-amino-5-mercapto-1,2,4-triazole to carbon tetrachloride. The mass volume ratio of vinyl silicone oil, 3-amino-5-mercapto-1,2,4-triazole and carbon tetrachloride is 10g:1.39g:80mL. After fully dispersed, add benzoin diethyl ether in an amount of 0.8% of the mass of vinyl silicone oil. Under ultraviolet light with a wavelength of 365nm and an intensity of 120mW / cm 2 The mixture was irradiated with ultraviolet light and stirred for 1.2 hours, and then the solvent was removed under reduced pressure, washed with water and dried to obtain modified silicone oil;

[0039] S2. Add nano-scale aluminum nitride powder (PD: 100-200 nm) to anhydrous ethanol, the mass ratio of nano-scale aluminum nitride powder to anhydrous ethanol is 1 g: 15 mL, reflux for 3 h, filter and dry to obtain active aluminum nitride; add active aluminum nitride to thionyl chloride, the mass volume ratio of active aluminum nitride to thionyl chloride is 1 g: 30 mL, stir at 65 ° C for 10 h, filter and dry to obtain aluminum nitride chloride;

[0040] S3. Add the modified silicone oil to toluene, stir thoroughly, then add aluminum nitride chloride, the mass volume ratio of the modified silicone oil, aluminum nitride chloride and toluene is 1g:0.56g:50mL, stir thoroughly again, then add 0.06% of the mass of the modified silicone oil, triethylamine, and stir for 10 hours. After the treatment, remove the solvent by rotary evaporation, and obtain modified aluminum nitride after drying.

[0041] The method for preparing the above-mentioned durable liquid silicone comprises the following steps:

[0042] Step 1, adding the modifier into the hydroxy-terminated polysiloxane, and stirring well to obtain a mixture A;

[0043] Step 2, mixing the crosslinking agent, the catalyst and the stabilizer, and stirring them thoroughly to obtain a mixture B;

[0044] Step 3, adding mixed material B to mixed material A, stirring evenly, injecting into a mold, first degassing, and then curing in the air and demolding to obtain liquid silicone.

[0045] Example 2

[0046] A long-lasting liquid silicone comprising, by weight:

[0047] 60 parts of terminal hydroxyl polysiloxane, 16 parts of modifier, 3 parts of crosslinking agent, 0.5 parts of catalyst and 1 part of stabilizer.

[0048] The hydroxyl-terminated polysiloxane is hydroxyl-terminated polydimethylsiloxane (HTPDMS) with a weight average molecular weight of 2400, a hydroxyl molar content of 0.8%, and a viscosity of 124 mm 2 / s; the crosslinking agent is methyl orthosilicate; the catalyst is stannous octoate; and the stabilizer is polyethylene glycol PEG-1000.

[0049] The preparation method of the modifier comprises:

[0050] S1. Add vinyl silicone oil (Mw: 2000, Et%: 4.6mol%) and 3-amino-5-mercapto-1,2,4-triazole to carbon tetrachloride. The mass volume ratio of vinyl silicone oil, 3-amino-5-mercapto-1,2,4-triazole and carbon tetrachloride is 10g:0.93g:60mL. After fully dispersed, add benzoin dimethyl ether in an amount of 0.6% of the mass of vinyl silicone oil. Under ultraviolet light with a wavelength of 365nm and an intensity of 80mW / cm 2 The mixture was irradiated with ultraviolet light and stirred for 0.6 h, and then the solvent was removed under reduced pressure, washed with water and dried to obtain modified silicone oil;

[0051] S2. Add nano-scale aluminum nitride powder (PD: 100-200 nm) to anhydrous ethanol, the mass ratio of nano-scale aluminum nitride powder to anhydrous ethanol is 1 g: 10 mL, reflux for 2 h, filter and dry to obtain active aluminum nitride; add active aluminum nitride to thionyl chloride, the mass volume ratio of active aluminum nitride to thionyl chloride is 1 g: 20 mL, stir at 60° C. for 8 h, filter and dry to obtain aluminum nitride chloride;

[0052] S3. Add the modified silicone oil to toluene, stir thoroughly, then add aluminum nitride chloride, the mass volume ratio of the modified silicone oil, aluminum nitride chloride and toluene is 1g:0.37g:30mL, stir thoroughly again, then drop 0.04% of the mass of the modified silicone oil in triethylamine, stir for 6h, after the treatment is completed, remove the solvent by rotary evaporation, and obtain modified aluminum nitride after drying.

[0053] The method for preparing the above-mentioned durable liquid silicone comprises the following steps:

[0054] Step 1, adding the modifier into the hydroxy-terminated polysiloxane, and stirring well to obtain a mixture A;

[0055] Step 2, mixing the crosslinking agent, the catalyst and the stabilizer, and stirring them thoroughly to obtain a mixture B;

[0056] Step 3, adding mixed material B to mixed material A, stirring evenly, injecting into a mold, first degassing, and then curing in the air and demolding to obtain liquid silicone.

[0057] Example 3

[0058] A long-lasting liquid silicone comprising, by weight:

[0059] 70 parts of terminal hydroxyl polysiloxane, 22 parts of modifier, 6 parts of crosslinking agent, 1.8 parts of catalyst and 3 parts of stabilizer.

[0060] The hydroxyl-terminated polysiloxane is hydroxyl-terminated polydimethylsiloxane (HTPDMS) with a weight average molecular weight of 3000, a hydroxyl molar content of 1.4%, and a viscosity of 139 mm 2 / s; the crosslinking agent is methyltrimethoxysilane; the catalyst is dibutyltin oxide; and the stabilizer is ethylene glycol monoethyl ether.

[0061] The preparation method of the modifier comprises:

[0062] S1. Add vinyl silicone oil (Mw: 2000, Et%: 4.6mol%) and 3-amino-5-mercapto-1,2,4-triazole to carbon tetrachloride. The mass volume ratio of vinyl silicone oil, 3-amino-5-mercapto-1,2,4-triazole and carbon tetrachloride is 10g:1.21g:80mL. After fully dispersed, add benzoin dimethyl ether in an amount of 0.8% of the mass of vinyl silicone oil. Under ultraviolet light with a wavelength of 365nm and an intensity of 100mW / cm 2 The mixture was irradiated with ultraviolet light and stirred for 1 hour, and then the solvent was removed under reduced pressure, washed with water and dried to obtain modified silicone oil;

[0063] S2. Add nano-scale aluminum nitride powder (PD: 100-200 nm) to anhydrous ethanol, the mass ratio of nano-scale aluminum nitride powder to anhydrous ethanol is 1 g: 15 mL, reflux for 3 h, filter and dry to obtain active aluminum nitride; add active aluminum nitride to thionyl chloride, the mass volume ratio of active aluminum nitride to thionyl chloride is 1 g: 30 mL, stir at 60° C. for 12 h, filter and dry to obtain aluminum nitride chloride;

[0064] S3. Add the modified silicone oil to toluene, stir thoroughly, then add aluminum nitride chloride, the mass volume ratio of the modified silicone oil, aluminum nitride chloride and toluene is 1g:0.65g:40mL, stir thoroughly again, then drop 0.05% of triethylamine by mass of the modified silicone oil, stir for 8h, after the treatment is completed, remove the solvent by rotary evaporation, and obtain modified aluminum nitride after drying.

[0065] The method for preparing the above-mentioned durable liquid silicone comprises the following steps:

[0066] Step 1, adding the modifier into the hydroxy-terminated polysiloxane, and stirring well to obtain a mixture A;

[0067] Step 2, mixing the crosslinking agent, the catalyst and the stabilizer, and stirring them thoroughly to obtain a mixture B;

[0068] Step 3, adding mixed material B to mixed material A, stirring evenly, injecting into a mold, first degassing, and then curing in the air and demolding to obtain liquid silicone.

[0069] Example 4

[0070] A long-lasting liquid silicone comprising, by weight:

[0071] 100 parts of terminal hydroxyl polysiloxane, 32 parts of modifier, 8 parts of crosslinking agent, 2 parts of catalyst and 5 parts of stabilizer.

[0072] The hydroxyl-terminated polysiloxane is hydroxyl-terminated polydimethylsiloxane (HTPDMS) with a weight average molecular weight of 3300, a hydroxyl molar content of 1.5%, and a viscosity of 143 mm 2 / s; the crosslinking agent is methyl tri(methyl isobutyl ketone oxime) silane; the catalyst is dibutyl tin dilaurate; and the stabilizer is ethylene glycol vinyl ether.

[0073] The preparation method of the modifier comprises:

[0074] S1. Add vinyl silicone oil (Mw: 2000, Et%: 4.6mol%) and 3-amino-5-mercapto-1,2,4-triazole to carbon tetrachloride. The mass volume ratio of vinyl silicone oil, 3-amino-5-mercapto-1,2,4-triazole and carbon tetrachloride is 10g:1.86g:100mL. After fully dispersed, add benzoin diethyl ether in an amount of 1.2% of the mass of vinyl silicone oil. Under ultraviolet light with a wavelength of 365nm and an intensity of 160mW / cm 2 The mixture was irradiated with ultraviolet light and stirred for 1.8 hours, and then the solvent was removed under reduced pressure, washed with water and dried to obtain modified silicone oil;

[0075] S2. Add nano-aluminum nitride powder (PD: 100-200 nm) to anhydrous ethanol, the mass ratio of nano-aluminum nitride powder to anhydrous ethanol is 1 g: 20 mL, reflux for 4 h, filter and dry to obtain active aluminum nitride; add active aluminum nitride to thionyl chloride, the mass volume ratio of active aluminum nitride to thionyl chloride is 1 g: 40 mL, stir at 70° C. for 12 h, filter and dry to obtain aluminum nitride chloride;

[0076] S3. Add the modified silicone oil to toluene, stir thoroughly, then add aluminum nitride chloride, the mass volume ratio of the modified silicone oil, aluminum nitride chloride and toluene is 1g:0.74g:60mL, stir thoroughly again, then add 0.1% of triethylamine by mass of the modified silicone oil dropwise, stir for 12h, after the treatment is completed, remove the solvent by rotary evaporation, and obtain modified aluminum nitride after drying.

[0077] The method for preparing the above-mentioned durable liquid silicone comprises the following steps:

[0078] Step 1, adding the modifier into the hydroxy-terminated polysiloxane, and stirring well to obtain a mixture A;

[0079] Step 2, mixing the crosslinking agent, the catalyst and the stabilizer, and stirring them thoroughly to obtain a mixture B;

[0080] Step 3, adding mixed material B to mixed material A, stirring evenly, injecting into a mold, first degassing, and then curing in the air and demolding to obtain liquid silicone.

[0081] Comparative Example 1

[0082] A liquid silica gel, which differs from Example 1 in that the modifier is replaced by nano-scale aluminum nitride powder, and the other components and amounts remain unchanged.

[0083] Calculated by weight, including:

[0084] 80 parts of terminal hydroxyl polysiloxane, 24 parts of aluminum nitride powder, 4 parts of crosslinking agent, 1.3 parts of catalyst and 2 parts of stabilizer.

[0085] Comparative Example 2

[0086] A liquid silica gel, which differs from Example 1 in that the modifier is replaced by a mixture of nano-scale aluminum nitride powder and vinyl silicone oil, and the other components and amounts remain unchanged.

[0087] Calculated by weight, including:

[0088] 80 parts of terminal hydroxyl polysiloxane, 14.4 parts of aluminum nitride powder, 9.6 parts of vinyl silicone oil, 4 parts of crosslinking agent, 1.3 parts of catalyst and 2 parts of stabilizer.

[0089] Comparative Example 3

[0090] A liquid silica gel, which differs from Example 1 in that the modifier is replaced by a mixture of nano-scale aluminum nitride powder and modified silicone oil, wherein the preparation method of the modified silicone oil is the same as that of Example 1, and the other components and amounts remain unchanged.

[0091] Calculated by weight, including:

[0092] 80 parts of terminal hydroxyl polysiloxane, 14.4 parts of aluminum nitride powder, 9.6 parts of modified silicone oil, 4 parts of crosslinking agent, 1.3 parts of catalyst and 2 parts of stabilizer.

[0093] After the liquid silicone prepared in Example 1 and Comparative Examples 1-3 were cured at room temperature (25°C, 55RH%) for 24 hours, their properties were tested respectively. The testing standards for tensile strength and elongation at break were referenced to GB / T 528-2009, and the testing standard for high temperature resistance was referenced to GB / T 3512-2014. The results are shown in Table 1:

[0094] Table 1 Detection parameters of different liquid silica gel

[0095] Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Tensile strength(MPa) 7.82 5.13 5.58 6.25 Elongation at break (%) 468 410 436 451 Surface hardness (Shore A) 35 31 32 34 High temperature resistance(℃) 273 225 212 257

[0096] It can be seen from the above table that the liquid silicone prepared in Example 1 of the present invention obviously has higher strength, hardness and high temperature resistance, so it can be proved that the liquid silicone prepared in Example 1 of the present invention has good durability.

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0098] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A durable liquid silicone, characterized in that: Calculated by weight, including: 60-100 parts of terminal hydroxyl polysiloxane, 16-32 parts of modifier, 3-8 parts of crosslinking agent, 0.5-2 parts of catalyst and 1-5 parts of stabilizer.

2. A durable liquid silicone according to claim 1, characterized in that: The terminal hydroxyl polysiloxane is a terminal hydroxyl polydimethylsiloxane, with a weight average molecular weight of 2200-3600, a hydroxyl molar content of 0.7%-1.8%, and a viscosity of 100-150 mm 2 / s.

3. The durable liquid silicone according to claim 1, characterized in that: The crosslinking agent is one of methyl orthosilicate, ethyl orthosilicate, methyl trimethoxysilane, vinyl trimethoxysilane, and methyl tri(methyl isobutyl ketoxime) silane.

4. The durable liquid silicone according to claim 1, characterized in that: The catalyst is an organic tin catalyst, specifically including one of stannous octoate, dibutyltin dilaurate, and dibutyltin oxide.

5. The durable liquid silicone according to claim 1, characterized in that: The stabilizer is one of polyethylene glycol, ethylene glycol monoethyl ether, propylene glycol diacetate, and ethylene glycol vinyl ether.

6. The durable liquid silicone according to claim 1, characterized in that: The preparation method of the modifier comprises: S1. Add vinyl silicone oil and 3-amino-5-mercapto-1,2,4-triazole into carbon tetrachloride, fully disperse, then add photosensitizer, stir for 0.6-1.8h under ultraviolet light, then remove the solvent under reduced pressure, wash with water and dry to obtain modified silicone oil; S2, adding nano-scale aluminum nitride powder to anhydrous ethanol, reflux for 2-4 hours, filter and dry to obtain active aluminum nitride; adding active aluminum nitride to thionyl chloride, stirring at 60-70° C. for 8-12 hours, filter and dry to obtain aluminum nitride chloride; S3. Add the modified silicone oil to toluene, stir thoroughly, then add aluminum nitride chloride, stir thoroughly again, then add a few drops of triethylamine, stir for 6-12 hours, after the treatment is completed, remove the solvent by rotary evaporation, and obtain modified aluminum nitride after drying.

7. The durable liquid silicone according to claim 1, characterized in that: In the S1, the mass volume ratio of vinyl silicone oil, 3-amino-5-mercapto-1,2,4-triazole and carbon tetrachloride is 10g:(0.93-1.86)g:(60-100)mL.

8. The durable liquid silicone according to claim 1, characterized in that: In S2, the particle size of the nano-scale aluminum nitride powder is 100-200 nm, the mass ratio of the nano-scale aluminum nitride powder to anhydrous ethanol is 1 g:(10-20) mL; the mass volume ratio of active aluminum nitride to thionyl chloride is 1 g:(20-40) mL.

9. The durable liquid silicone according to claim 1, characterized in that: In the S3, the mass volume ratio of the modified silicone oil, aluminum nitride chloride and toluene is 1 g: (0.37-0.74) g: (30-60) mL; the amount of triethylamine added is 0.04%-0.1% of the mass of the modified silicone oil.

10. A method for preparing the durable liquid silicone according to claim 1, characterized in that: The following steps are involved: Step 1, adding a modifier into the hydroxy-terminated polysiloxane, and stirring the mixture to obtain a mixture A; Step 2, mixing the crosslinking agent, the catalyst and the stabilizer, and stirring them thoroughly to obtain a mixture B; Step 3, adding mixed material B to mixed material A, stirring evenly, injecting into a mold, first degassing, and then curing in the air and demolding to obtain the liquid silicone.