Antistatic additive for silicone rubber and preparation method thereof

Abstract

The present invention relates to the field of silicone rubber additives, and specifically discloses an antistatic additive for silicone rubber and a preparation method thereof. The antistatic additive for silicone rubber includes: 1-ethyl-3-methylimidazoline bis (trifluoromethylsulfonyl) imide and a vinyl silane coupling agent. The preparation method includes: 1), N-methylimidazole and butyl bromide are mixed, and the reaction is constant temperature to obtain an intermediate; 2), bis trifluoromethanesulfonyl imide is mixed with methanol to obtain a bis trifluoromethanesulfonyl imide solution; 3), the intermediate is mixed with the bis trifluoromethanesulfonyl imide solution, stirred, filtered, and methanol is removed to obtain 1-ethyl-3-methylimidazoline bis (trifluoromethylsulfonyl) imide; 4), 1-ethyl-3-methylimidazoline bis (trifluoromethylsulfonyl) imide and a vinyl silane coupling agent are mixed to obtain an antistatic additive for silicone rubber. The present invention has the advantages of improving the antistatic effect of silicone rubber and good durability of the antistatic effect.

Description

Technical Field

[0001] The invention relates to the field of silicone rubber additives, in particular to an antistatic additive for silicone rubber and a preparation method thereof. Background Art

[0002] Silicone (silicone rubber) is a polymer material with good insulation properties and relatively high static electricity. The resistivity is generally around 10 14 -10 15 Ohm. A large amount of static electricity will be generated during use. In order to eliminate static electricity, antistatic agents are generally added to the silica gel to reduce the surface resistance of the silicone (silicone rubber) to 10 6 -10 9 ohm.

[0003] Currently, black antistatic agents are generally acetylene black, or carbon nanotubes (single-wall or multi-wall); they have good antistatic effects, but cannot be adjusted in color, and can only be made black or adjusted to a dark color (dark yellow, dark green, dark blue, dark red) by adding other colors.

[0004] Light-colored antistatic agents, generally cationic surfactants, change the polarity of silica gel from hydrophobic to hydrophilic, forming a layer of water film on the surface of silica gel, thus achieving an antistatic effect; however, their durability is poor, and their compatibility and heat resistance are poor.

[0005] Therefore, ionic liquid antistatic agents are usually used. Ionic liquid antistatic agents can make the antistatic effect of silicone rubber more durable and transparent. However, the antistatic effect of silicone rubber using ionic liquid antistatic agents is not good, and the surface resistance generally does not reach 10 6 -10 9 Ohm, can only reach 10 11 -10 12 Ohm, the reason is that the ionic liquid antistatic agent has poor compatibility with silicone rubber and is prone to precipitation, which makes it difficult for the ionic liquid antistatic agent to fully exert its effectiveness, thus affecting the effect of reducing the resistance of silicone rubber. Therefore, there is still room for improvement. Summary of the invention

[0006] In order to improve the antistatic effect of silicone rubber and make the antistatic effect last longer, the present application provides an antistatic auxiliary agent for silicone rubber and a preparation method thereof.

[0007] In the first aspect, the present application provides an antistatic additive for silicone rubber, which adopts the following technical solution:

[0008] An antistatic additive for silicone rubber, comprising the following components in mass fractions:

[0009] 100 parts of 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide;

[0010] 12-16 parts of vinyl silane coupling agent;

[0011] The vinyl silane coupling agent is a compound of one or more of vinyl trimethoxy silane, vinyl triethoxy silane, vinyl triisopropoxy silane and vinyl trichloro silane.

[0012] Preferably, the following components are included in mass fraction:

[0013] 100 parts of 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide;

[0014] 13-15 parts of vinyl silane coupling agent.

[0015] By adopting the above technical scheme, 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide is used as the main material, so that the antistatic effect is more durable, and the vinyl silane coupling agent is used to make 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide and silicone rubber have better compatibility, thereby achieving better antistatic effect, and reducing the resistance of the prepared silicone rubber to a suitable range, so that it has both insulation and is not easy to accumulate static electricity.

[0016] Since 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide is a CC structure, and silicone rubber is a Si-O structure, the distance between the Si-O bonds is longer than that between the CC bonds. Therefore, the interfacial energy between silicone rubber and 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide is quite different, which makes the compatibility between 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide and silicone rubber relatively poor. With the addition of vinyl silane coupling agent, the vinyl end of the vinyl silane coupling agent is more compatible with 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide, and the silicon end of the vinyl silane coupling agent is more compatible with silicone rubber. The silane coupling agent forms a bridge connecting 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide and silicone rubber, thereby improving the compatibility of 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide and silicone rubber, making 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide uniformly dispersed in silicone rubber, so that 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide can reduce the resistance of silicone rubber as a whole, that is, the resistance distribution of silicone rubber is uniform, and it is not easy to have a phenomenon that the overall resistance is high due to high local resistance, thereby achieving the effect of making silicone rubber have better antistatic properties.

[0017] Preferably, the vinyl silane coupling agent is a compound of vinyl trimethoxy silane, vinyl triisopropoxy silane and vinyl trichlorosilane.

[0018] By adopting the above technical scheme, by specifically selecting vinyl trimethoxy silane, vinyl triisopropoxy silane and vinyl trichlorosilane for compounding, the effect of the vinyl silane coupling agent connecting the silicone rubber and 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide is better, so that the prepared silicone rubber has lower resistance and better antistatic effect.

[0019] Preferably, the vinyl silane coupling agent is vinyl trimethoxy silane, vinyl triisopropoxy silane, and vinyl trichlorosilane in a mass ratio of 1:0.3-0.5:1.7-1.9.

[0020] By adopting the above technical solution and matching in a specific ratio range, the vinyl silane coupling agent can achieve better effect of connecting silicone rubber and 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide, and better antistatic effect.

[0021] Preferably, the vinyl silane coupling agent is vinyl trimethoxy silane, vinyl triisopropoxy silane and vinyl trichlorosilane in a mass ratio of 1:0.4:1.8.

[0022] By adopting the above technical solution and using a specific proportion, 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide can be dispersed more evenly and is not easy to precipitate, and the antistatic effect of the prepared silicone rubber is better.

[0023] Preferably, the antistatic additive for silicone rubber further comprises the following components in mass fraction:

[0024] Silicone rubber 168-174 parts.

[0025] By adopting the above technical solution and adding silicone rubber, the antistatic additive for silicone rubber can be made into a solid state, which is convenient for weighing operation during processing and convenient for transportation and storage.

[0026] In a second aspect, the present application provides a method for preparing an antistatic additive for silicone rubber, using the following technical solution:

[0027] A method for preparing the above-mentioned antistatic auxiliary agent for silicone rubber comprises the following steps:

[0028] Step 1), N-methylimidazole and butyl bromide are mixed, and reacted at a constant temperature of 70-72° C. for 24-26 hours to obtain an intermediate, which is set aside;

[0029] Step 2), mixing bistrifluoromethanesulfonyl imide with methanol to obtain a bistrifluoromethanesulfonyl imide solution for later use;

[0030] Step 3), mixing the intermediate with a bis(trifluoromethanesulfonyl)imide solution, stirring for 2-2.1 hours, filtering and removing methanol to obtain 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide;

[0031] Step 4), 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide and a vinyl silane coupling agent are mixed to obtain an antistatic additive for silicone rubber.

[0032] By adopting the above technical scheme, N-methylimidazole and butyl bromide are used to synthesize an intermediate, and then 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide is synthesized with bistrifluoromethanesulfonyl imide, so that the prepared 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide has better quality and the antistatic performance of the modified silicone rubber is better.

[0033] Preferably, in the step 1), the intermediate is washed by ethyl acetate separation, and after removing the ethyl acetate, it is set aside.

[0034] By adopting the technical scheme and washing with ethyl acetate, the intermediate is made purer, and the quality of the prepared 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide is better.

[0035] In summary, this application has the following beneficial effects:

[0036] 1. Since the present application adopts 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide as the main material, the antistatic effect is more durable, and the vinyl silane coupling agent is used to make 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide have better compatibility with silicone rubber, thereby making the antistatic effect better, so that the resistance of the prepared silicone rubber is reduced to a suitable range, which has both insulation and is not easy to accumulate static electricity.

[0037] 2. In the present application, it is preferred to specifically select vinyl trimethoxy silane, vinyl triisopropoxy silane and vinyl trichlorosilane for compounding, so that the vinyl silane coupling agent can better connect the silicone rubber with 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide, so that the obtained silicone rubber has lower resistance and better antistatic effect.

[0038] 3. The method of the present application adopts N-methylimidazole and butyl bromide to synthesize an intermediate, and then synthesizes 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide with bistrifluoromethanesulfonyl imide, so that the obtained 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide has better quality and the antistatic performance of the modified silicone rubber is better. DETAILED DESCRIPTION

[0039] The present application is further described in detail below with reference to the embodiments.

[0040] The sources of the raw materials used in the following examples and experimental examples are detailed in Table 1.

[0041] Table 1

[0042]

[0043]

[0044] Example 1

[0045] An antistatic additive for silicone rubber, comprising:

[0046] 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide 1 kg, vinyl silane coupling agent 0.12 kg.

[0047] The vinyl silane coupling agent is a compound of vinyl trimethoxy silane, vinyl triisopropoxy silane and vinyl trichloro silane.

[0048] The vinyl silane coupling agent is vinyl trimethoxysilane, vinyl triisopropoxysilane and vinyl trichlorosilane in a mass ratio of 1:0.3:1.7.

[0049] The preparation method of the antistatic additive for silicone rubber comprises the following steps:

[0050] Step 1), 10 mol N-methylimidazole and 10 mol butyl bromide are put into a reaction kettle, the speed is 12 r / min, the mixture is continuously stirred, the temperature is raised to 70°C, and the reaction is carried out at a constant temperature for 24 hours to generate a light yellow liquid, the light yellow liquid is discharged, and the liquid is separated and washed three times with 1L ethyl acetate. After the ethyl acetate is discharged, the intermediate is distilled for 30 minutes to remove the residual ethyl acetate to obtain an intermediate for standby use.

[0051] Step 2), 1.81 kg of bistrifluoromethanesulfonyl imide and 5 L of methanol were added into a reaction kettle at a speed of 20 r / min and stirred for 10 min to dissolve the bistrifluoromethanesulfonyl imide in methanol to obtain a bistrifluoromethanesulfonyl imide solution for standby use.

[0052] Step 3), the intermediate is put into a reaction kettle and mixed with the bis(trifluoromethanesulfonyl)imide solution at a speed of 15 r / min, stirred for 2 h, filtered through a 1000 mesh screen to obtain a synthetic liquid, and the synthetic liquid is distilled for 30 min to remove methanol to obtain 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide.

[0053] Step 4), according to the formula, weigh 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide and vinyl silane coupling agent, put 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide and vinyl silane coupling agent into a stirring kettle at room temperature, rotate at 20 r / min, stir for 15 minutes, mix evenly, and obtain an antistatic additive for silicone rubber.

[0054] Example 2

[0055] An antistatic additive for silicone rubber, compared with Example 1, the only difference is:

[0056] Antistatic additives for silicone rubber include:

[0057] 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide 1 kg, vinyl silane coupling agent 0.13 kg.

[0058] The vinyl silane coupling agent is a compound of vinyl trimethoxy silane, vinyl triisopropoxy silane and vinyl trichloro silane.

[0059] The vinyl silane coupling agent is vinyl trimethoxysilane, vinyl triisopropoxysilane and vinyl trichlorosilane in a mass ratio of 1:0.35:1.75.

[0060] Example 3

[0061] An antistatic additive for silicone rubber, compared with Example 1, the only difference is:

[0062] Antistatic additives for silicone rubber include:

[0063] 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide 1 kg, vinyl silane coupling agent 0.14 kg.

[0064] The vinyl silane coupling agent is a compound of vinyl trimethoxy silane, vinyl triisopropoxy silane and vinyl trichloro silane.

[0065] The vinyl silane coupling agent is vinyl trimethoxysilane, vinyl triisopropoxysilane and vinyl trichlorosilane in a mass ratio of 1:0.4:1.8.

[0066] Example 4

[0067] An antistatic additive for silicone rubber, compared with Example 1, the only difference is:

[0068] Antistatic additives for silicone rubber include:

[0069] 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide 1 kg, vinyl silane coupling agent 0.15 kg.

[0070] The vinyl silane coupling agent is a compound of vinyl trimethoxy silane, vinyl triisopropoxy silane and vinyl trichloro silane.

[0071] The vinyl silane coupling agent is vinyl trimethoxysilane, vinyl triisopropoxysilane and vinyl trichlorosilane in a mass ratio of 1:0.45:1.85.

[0072] Example 5

[0073] An antistatic additive for silicone rubber, compared with Example 1, the only difference is:

[0074] Antistatic additives for silicone rubber include:

[0075] 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide 1 kg, vinyl silane coupling agent 0.16 kg.

[0076] The vinyl silane coupling agent is a compound of vinyl trimethoxy silane, vinyl triisopropoxy silane and vinyl trichloro silane.

[0077] The vinyl silane coupling agent is vinyl trimethoxy silane, vinyl triisopropoxy silane and vinyl trichlorosilane in a mass ratio of 1:0.5:1.9.

[0078] Example 6

[0079] An antistatic additive for silicone rubber, compared with Example 3, the only difference is:

[0080] The preparation method of the antistatic additive for silicone rubber comprises the following steps:

[0081] Step 1), 10 mol N-methylimidazole and 10 mol bromobutyl are put into a reaction kettle, the speed is 12 r / min, the mixture is continuously stirred, the temperature is raised to 72°C, and the reaction is carried out at a constant temperature for 26 hours to generate a light yellow liquid, the light yellow liquid is discharged, and the liquid is separated and washed three times with 1L ethyl acetate. After the ethyl acetate is discharged, the intermediate is distilled for 30 minutes to remove the residual ethyl acetate to obtain an intermediate for standby use.

[0082] Step 2), 1.81 kg of bistrifluoromethanesulfonyl imide and 5 L of methanol were added into a reaction kettle at a speed of 20 r / min and stirred for 10 min to dissolve the bistrifluoromethanesulfonyl imide in methanol to obtain a bistrifluoromethanesulfonyl imide solution for standby use.

[0083] Step 3), the intermediate is put into a reaction kettle and mixed with the bis(trifluoromethanesulfonyl)imide solution at a speed of 15 r / min, stirred for 2.1 h, filtered through a 1000 mesh screen to obtain a synthetic liquid, and the synthetic liquid is distilled for 30 min to remove methanol to obtain 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide.

[0084] Step 4), according to the formula, weigh 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide and vinyl silane coupling agent, put 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide and vinyl silane coupling agent into a stirring kettle at room temperature, rotate at 20 r / min, stir for 15 minutes, mix evenly, and obtain an antistatic additive for silicone rubber.

[0085] Example 7

[0086] An antistatic additive for silicone rubber, comprising:

[0087] 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide 1 kg, vinyl silane coupling agent 0.12 kg, silicone rubber 1.68 kg.

[0088] The vinyl silane coupling agent is a compound of vinyl trimethoxy silane, vinyl triisopropoxy silane and vinyl trichloro silane.

[0089] The vinyl silane coupling agent is vinyl trimethoxysilane, vinyl triisopropoxysilane and vinyl trichlorosilane in a mass ratio of 1:0.3:1.7.

[0090] The preparation method of the antistatic additive for silicone rubber comprises the following steps:

[0091] Step 1), 10 mol N-methylimidazole and 10 mol butyl bromide are put into a reaction kettle, the speed is 12 r / min, the mixture is continuously stirred, the temperature is raised to 70°C, and the reaction is carried out at a constant temperature for 24 hours to generate a light yellow liquid, the light yellow liquid is discharged, and the liquid is separated and washed three times with 1L ethyl acetate. After the ethyl acetate is discharged, the intermediate is distilled for 30 minutes to remove the residual ethyl acetate to obtain an intermediate for standby use.

[0092] Step 2), 1.81 kg of bistrifluoromethanesulfonyl imide and 5 L of methanol were added into a reaction kettle at a speed of 20 r / min and stirred for 10 min to dissolve the bistrifluoromethanesulfonyl imide in methanol to obtain a bistrifluoromethanesulfonyl imide solution for standby use.

[0093] Step 3), the intermediate is put into a reaction kettle and mixed with the bis(trifluoromethanesulfonyl)imide solution at a speed of 15 r / min, stirred for 2 h, filtered through a 1000 mesh screen to obtain a synthetic liquid, and the synthetic liquid is distilled for 30 min to remove methanol to obtain 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide.

[0094] Step 4), according to the formula, weigh 1-ethyl-3-methylimidazoline bis (trifluoromethylsulfonyl) imide, vinyl silane coupling agent, silicone rubber, put 1-ethyl-3-methylimidazoline bis (trifluoromethylsulfonyl) imide and vinyl silane coupling agent into a stirring kettle at room temperature, rotate at 20r / min, stir for 15min, mix evenly, and obtain a liquid antistatic additive, put the liquid antistatic additive and silicone rubber into an internal mixer, mix at 120°C for 90min, then extract the air in the internal mixer, reduce the pressure of the internal mixer to 0.04Mpa, keep it for 30min, unload and tablet, and obtain a solid antistatic additive for silicone rubber.

[0095] Example 8

[0096] An antistatic additive for silicone rubber, compared with Example 7, the only difference is:

[0097] Antistatic additives for silicone rubber include:

[0098] 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide 1 kg, vinyl silane coupling agent 0.16 kg, silicone rubber 1.74 kg.

[0099] Experimental Example 1

[0100] An antistatic silicone rubber test piece, comprising:

[0101] 1kg silicone rubber, 0.5kg white carbon black, 0.01kg antistatic agent for silicone rubber, 0.04kg silane coupling agent, 0.01kg vulcanizing agent, 0.05kg dimethylhydroxy silicone oil.

[0102] The preparation method of antistatic silicone rubber is as follows:

[0103] Step 1), silicone rubber, silane coupling agent, dimethylhydroxy silicone oil are put into an internal mixer, mixed for 30 seconds, 0.4 kg of white carbon black is added, mixed for 45 seconds, the remaining 0.1 kg of white carbon black and antistatic additives of silicone rubber are added, mixed at 120 ° C for 90 minutes, and then the air in the internal mixer is extracted, the pressure of the internal mixer is controlled to 0.04 MPa, maintained for 30 minutes, unloaded and cooled to room temperature to obtain a mixed rubber.

[0104] Step 2), the rubber mix and the vulcanizing agent are mixed evenly through an open mixer to obtain a final rubber mix.

[0105] Step 3), the final rubber mixture is placed in a mold, pressed and vulcanized at 175° C. for 5 min to obtain an antistatic silicone rubber test piece with a thickness of 2 mm.

[0106] In this experimental example, the antistatic auxiliary agent for silicone rubber used is the antistatic auxiliary agent for silicone rubber of Example 1.

[0107] Experimental Example 2

[0108] An antistatic silicone rubber test piece, compared with Experimental Example 1, differs only in that:

[0109] In this experimental example, the antistatic auxiliary agent for silicone rubber used is the antistatic auxiliary agent for silicone rubber of Example 2.

[0110] Experimental Example 3

[0111] An antistatic silicone rubber test piece, compared with Experimental Example 1, differs only in that:

[0112] In this experimental example, the antistatic auxiliary agent for silicone rubber used is the antistatic auxiliary agent for silicone rubber of Example 3.

[0113] Experimental Example 4

[0114] An antistatic silicone rubber test piece, compared with Experimental Example 1, differs only in that:

[0115] In this experimental example, the antistatic auxiliary agent for silicone rubber used is the antistatic auxiliary agent for silicone rubber of Example 4.

[0116] Experimental Example 5

[0117] An antistatic silicone rubber test piece, compared with Experimental Example 1, differs only in that:

[0118] In this experimental example, the antistatic auxiliary agent for silicone rubber used is the antistatic auxiliary agent for silicone rubber of Example 5.

[0119] Experimental Example 6

[0120] An antistatic silicone rubber test piece, compared with Experimental Example 1, differs only in that:

[0121] In this experimental example, the antistatic auxiliary agent for silicone rubber used is the antistatic auxiliary agent for silicone rubber of Example 6.

[0122] Experimental Example 7

[0123] An antistatic silicone rubber test piece, compared with Experimental Example 1, differs only in that:

[0124] Antistatic silicone rubber test piece, including:

[0125] 0.975kg silicone rubber, 0.5kg white carbon black, 0.025kg antistatic agent for silicone rubber, 0.04kg silane coupling agent, 0.01kg vulcanizing agent, and 0.05kg dimethylhydroxy silicone oil.

[0126] In this experimental example, the antistatic auxiliary agent for silicone rubber used is the antistatic auxiliary agent for silicone rubber of Example 7.

[0127] Experimental Example 8

[0128] An antistatic silicone rubber test piece, compared with Experimental Example 1, differs only in that:

[0129] Antistatic silicone rubber test piece, including:

[0130] 0.975kg silicone rubber, 0.5kg white carbon black, 0.025kg antistatic agent for silicone rubber, 0.04kg silane coupling agent, 0.01kg vulcanizing agent, and 0.05kg dimethylhydroxy silicone oil.

[0131] In this experimental example, the antistatic auxiliary agent for silicone rubber used is the antistatic auxiliary agent for silicone rubber of Example 8.

[0132] Experimental Example 9

[0133] An antistatic silicone rubber test piece, compared with Experimental Example 1, differs only in that:

[0134] In this experimental example, the antistatic agent used for silicone rubber is 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide prepared in Example 1.

[0135] Experiment 1

[0136] According to ASTM D257 "Standard Test Method for DC Resistance or Conductance of Insulating Materials", the resistance of the antistatic silicone rubber test piece prepared in each experimental example was measured after being placed in the shade for 7 days, and the resistance of the exposed surface after being exposed to the sun for 6 months.

[0137] The specific test data of Experiment 1 are shown in Table 2.

[0138] Table 2

[0139] Cool 7d resistance (Ω) Resistance after 6 months exposure (Ω) Experimental Example 1 <![CDATA[7.44×10 6 ]]> <![CDATA[9.81×10 6 <!-- 7 -->]]> Experimental Example 2 <![CDATA[7.31×10 6 ]]> <![CDATA[9.63×10 6 ]]> Experimental Example 3 <![CDATA[7.29×10 6 ]]> <![CDATA[9.59×10 6 ]]> Experimental Example 4 <![CDATA[7.36×10 6 ]]> <![CDATA[9.68×10 6 ]]> Experimental Example 5 <![CDATA[7.39×10 6 ]]> <![CDATA[9.72×10 6 ]]> Experimental Example 6 <![CDATA[7.32×10 6 ]]> <![CDATA[9.55×10 6 ]]> Experimental Example 7 <![CDATA[7.25×10 6 ]]> <![CDATA[9.32×10 6 ]]> Experimental Example 8 <![CDATA[7.27×10 6 ]]> <![CDATA[9.35×10 6 ]]> Experimental Example 9 <![CDATA[6.63×10 11 ]]> <![CDATA[3.52×10 12 ]]>

[0140] According to the data comparison between Experimental Example 3 and Experimental Example 9 in Table 2, it can be obtained that the resistance of the test piece using 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide alone after 7 days in the shade is significantly higher than the resistance of the test piece using the antistatic additive for silicone rubber after 7 days in the shade. It can be seen that when 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide is used alone, the compatibility of 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide with silicone rubber is poor, and precipitation has occurred after 7 days of cool storage, resulting in uneven distribution of the effect of reducing resistance, poor effect, and the overall resistance of the test piece is higher.

[0141] In addition, after 6 months of exposure, the resistance of the test piece using only 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide was further improved, while the resistance of the test piece using the antistatic additive for silicone rubber increased less. It can be seen that the use of the antistatic additive for silicone rubber can make the silicone rubber test piece have better antistatic performance and the effect of the antistatic performance has better durability.

[0142] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. An antistatic additive for silicone rubber, characterized in that: The following components are included in mass fraction: 100 parts of 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide; 12-16 parts of vinyl silane coupling agent; The vinyl silane coupling agent is a compound of vinyl trimethoxy silane, vinyl triisopropoxy silane and vinyl trichlorosilane.

2. The antistatic additive for silicone rubber according to claim 1, characterized in that: The following components are included in mass fraction: 100 parts of 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide; 13-15 parts of vinyl silane coupling agent.

3. The antistatic additive for silicone rubber according to claim 1, characterized in that: The vinyl silane coupling agent is vinyl trimethoxy silane, vinyl triisopropoxy silane and vinyl trichlorosilane in a mass ratio of 1:0.3-0.5:1.7-1.

9.

4. The antistatic additive for silicone rubber according to claim 3, characterized in that: The vinyl silane coupling agent is vinyl trimethoxy silane, vinyl triisopropoxy silane and vinyl trichlorosilane in a mass ratio of 1:0.4:1.

8.

5. An antistatic additive for silicone rubber according to any one of claims 1 to 4, characterized in that: The antistatic additive for silicone rubber also includes the following components by mass fraction: Silicone rubber 168-174 parts.

6. A method for preparing an antistatic additive for silicone rubber according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1), mix N-methylimidazole and butyl bromide, and react at a constant temperature of 70-72°C for 24-26 hours to obtain an intermediate for later use; Step 2), mixing bis(trifluoromethanesulfonyl)imide with methanol to obtain a bis(trifluoromethanesulfonyl)imide solution for later use; Step 3), the intermediate is mixed with a bis(trifluoromethanesulfonyl)imide solution, stirred for 2-2.1 hours, filtered and methanol removed to obtain 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide; Step 4), 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide and vinyl silane coupling agent are mixed to obtain an antistatic additive for silicone rubber.

7. The method for preparing an antistatic additive for silicone rubber according to claim 6, characterized in that: In the step 1), the intermediate is washed by ethyl acetate separation, and after removing the ethyl acetate, it is set aside.

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