Antistatic silicone rubber composition and preparation method thereof

Abstract

The invention provides an antistatic silicone rubber composition and a preparation method thereof, and the antistatic silicone rubber composition comprises the following components in parts by weight: 100 parts of polysiloxane containing at least three aliphatic unsaturated groups, 5-60 parts of a reinforcing agent, 2-15 parts of a structured control agent, 0.5-5 parts of an anti-yellowing auxiliary agent, 0.05-2 parts of an internal release agent, 0.1-2 parts of a vulcanizing agent and 0.5-5 parts of an antistatic agent, the antistatic agent comprises an organic antistatic agent and an inorganic antistatic agent. The antistatic silicone rubber composition has excellent antistatic performance, tear resistance, low blooming performance and high pressure change performance, the preparation process is simple, and the antistatic silicone rubber composition is suitable for industrial production.

Description

Technical Field

[0001] The invention belongs to the field of silicone rubber preparation and relates to an antistatic silicone rubber composition and a preparation method thereof. Background Art

[0002] Silicone rubber has good aging resistance and high and low temperature resistance. The application of silicone rubber composite materials in industry, automobile, medical and aerospace fields has developed rapidly. At present, silicone rubber polymer materials have been widely used in various fields such as daily life and food. It has the advantages of weather resistance, corrosion resistance and high insulation resistance. Its surface resistance can usually be as high as 10 14 Ω~10 17 Ω, but precisely because of its good insulation properties, silicone rubber polymer materials often have a static hazard problem when used. In daily use, due to friction, static electricity is easily accumulated on products made of silicone rubber materials, and the surface often attracts dust, affecting the cleanliness and appearance, and may eventually cause sparks or equipment short circuits due to discharge. Therefore, the anti-static property of silicone rubber composite materials is an important issue. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides an antistatic silicone rubber composition and a preparation method thereof. The antistatic silicone rubber composition has excellent antistatic performance, tear resistance, low blooming performance and high voltage deformation performance, a simple preparation process, and is suitable for industrial production.

[0004] In order to achieve the above technical effects, the present invention adopts the following technical solutions:

[0005] One of the purposes of the present invention is to provide an antistatic silicone rubber composition, which comprises, by weight:

[0006]

[0007]

[0008] Antistatic agents include organic antistatic agents and inorganic antistatic agents.

[0009] As a preferred technical solution of the present invention, the structural formula of polysiloxane is shown in Formula 1:

[0010]

[0011] R 1 , R 2 , R 6 , R 7 , R 8 and R 9Each independently includes any one or a combination of at least two of a halogen atom, -CN, -SCN, -NCO, a methyl group, an ethyl group, a n-propyl group, an isopropyl group, a n-butyl group, an isobutyl group, a tert-butyl group, a n-butyl group, an isobutyl group, an isopentane group, a neopentyl group, a tert-pentyl group, a hexyl group, a phenyl group or a tolyl group;

[0012] R 3 , R 5 and R 10 are independently any one of a group containing a carbon-carbon double bond and / or a carbon-carbon triple bond, a halogen atom, -CN, -SCN, -NCO, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group, an n-butyl group, an isobutyl group, an isopentane group, a neopentyl group, a tert-pentyl group, a hexyl group, a phenyl group or a tolyl group, or a combination of at least two thereof;

[0013] R 4 A group containing a carbon-carbon double bond and / or a carbon-carbon triple bond;

[0014] The group containing a carbon-carbon double bond and / or a carbon-carbon triple bond includes any one of vinyl, propenyl, methallyl, 1-propenyl, ethynyl, butadienyl, hexadienyl, vinylphenyl or styryl, preferably vinyl;

[0015] x is a natural number from 1 to 580, and y is a natural number from 1 to 11500.

[0016] As a preferred technical solution of the present invention, the reinforcing agent includes fumed silica.

[0017] Preferably, the specific surface area of ​​fumed silica is 150 to 400 m 2 / g.

[0018] As a preferred technical solution of the present invention, the structured control agent includes any one or a combination of at least two of hexamethyldisilazane, hydroxy silicone oil, dimethyldiethoxysilane, methyltrimethoxysilane, alkoxy silicone oil, hydroxy-terminated vinyl silicone oil, diphenylsilanediol or triphenylsilanol.

[0019] As a preferred technical solution of the present invention, the anti-yellowing auxiliary agent includes hydrogen-containing silicone oil.

[0020] Preferably, the viscosity of the hydrogen-containing silicone oil is 15 to 100 mPa·s, and H% is 0.3 to 1.2 wt%.

[0021] As a preferred technical solution of the present invention, the internal mold release agent includes stearic acid and / or stearate.

[0022] Preferably, the stearate includes any one of zinc stearate, calcium stearate or magnesium stearate, or a combination of at least two of them.

[0023] As a preferred technical solution of the present invention, the vulcanizing agent is any one of dibenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert-butyl perbenzoate, di-tert-butyl peroxide, diisopropylbenzene peroxide or 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane, or a combination of at least two thereof.

[0024] As a preferred technical solution of the present invention, the organic antistatic agent includes any one or a combination of polyethylene glycol ether, polyethylene glycol ester, morpholine hydrochloride, sulfonate hexadecyltrimethylammonium bromide, sodium dodecyl sulfate or polyacryloyloxyethyltrimethylammonium chloride.

[0025] Preferably, the inorganic antistatic agent comprises zinc oxide and / or tin oxide.

[0026] The second object of the present invention is to provide a method for preparing the antistatic silicone rubber composition provided by the first object, the preparation method comprising:

[0027] The base rubber is obtained by mixing a polysiloxane containing at least three aliphatic unsaturated groups, a reinforcing agent, a structural control agent and an anti-yellowing aid;

[0028] The base rubber material is mixed with the internal mold release agent, the antistatic agent and the vulcanizing agent, and then the mixture is kneaded and thinned to obtain a rubber mixture;

[0029] The mixed rubber is subjected to compression molding and secondary vulcanization to obtain an antistatic silicone rubber composition.

[0030] As a preferred technical solution of the present invention, the temperature of the compression molding is 110-180°C.

[0031] Compared with the prior art, the present invention has at least the following beneficial effects:

[0032] (1) The present invention provides an antistatic silicone rubber composition, which has excellent antistatic performance and a surface resistance of up to 10 8 Ω level, and has excellent stability, after 6 months the resistance can still be maintained up to 10 8 Ω level;

[0033] (2) The present invention provides an antistatic silicone rubber composition, which has excellent mechanical properties, a tear strength of more than 33 kN / m, an elongation at break of more than 700%, and a tensile strength of more than 9.1 MPa.

[0034] (3) The present invention provides an antistatic silicone rubber composition, which also has excellent low blooming performance and low pressure change performance;

[0035] (4) The present invention provides a method for preparing an antistatic silicone rubber composition, which has a simple process and is suitable for industrial production. DETAILED DESCRIPTION

[0036] The technical solution of the present application is further described below through specific implementation methods.

[0037] A specific embodiment of the present invention provides an antistatic silicone rubber composition, which comprises, by weight:

[0038]

[0039]

[0040] The antistatic agent includes a combination of an organic antistatic agent and an inorganic antistatic agent.

[0041] In a specific embodiment of the present invention, the weight portion of the reinforcing agent in the antistatic silicone rubber composition can be 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 40 parts, 50 parts or 60 parts, etc., the weight portion of the structuring control agent can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts, etc., the weight portion of the anti-yellowing auxiliary agent can be 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts, etc., The weight portion of the internal release agent can be 0.05 parts, 0.1 parts, 0.2 parts, 0.5 parts, 1 parts, 1.5 parts or 2 parts, etc., the weight portion of the vulcanizer can be 0.1 parts, 0.2 parts, 0.5 parts, 0.8 parts, 1 parts, 1.2 parts, 1.5 parts, 1.8 parts or 2 parts, etc., and the weight portion of the antistatic agent can be 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts, etc., but are not limited to the listed values, and other unlisted values ​​within the above numerical ranges are equally applicable.

[0042] In the present invention, an internal antistatic agent is added during the processing of silicone rubber, and the agent migrates from the inside to the surface to exert its effect; a substance with surfactant properties in the organic antistatic agent forms a conductive layer on the surface of the material, and the organic antistatic agent with hygroscopic properties absorbs environmental moisture by relying on hygroscopic effect to form a conductive water film on the surface, thereby promoting static electricity leakage; conductive ions are generated by ionization to eliminate static electricity, and the inorganic antistatic agent reduces resistance by forming a conductive network in the material. After the organic antistatic auxiliary agent and the inorganic antistatic agent are compounded, the antistatic effect of the silicone rubber composition is synergistically more durable, and the preparation process is simple.

[0043] In the present invention, the reason why the silicone rubber has excellent mechanical properties, low blooming performance and high pressure deformation performance is that the structure control agent uses a low molecular weight "hydroxyl-terminated vinyl silicone oil" whose molecular structure contains vinyl groups, which can participate in the reaction and be grafted into the siloxane network structure during the vulcanization process, thereby reducing the free structure control agent in the system. The silicone oil will not separate from the rubber system during the long-term storage of the rubber, resulting in the precipitation of silicone oil on the surface.

[0044] In a specific embodiment of the present invention, the organic antistatic agent includes any one of polyethylene glycol ether, polyethylene glycol ester, morpholine hydrochloride, sulfonate hexadecyltrimethylammonium bromide, sodium lauryl sulfate or polyacryloyloxyethyltrimethylammonium chloride. Polyethylene glycol ether and polyethylene glycol ester are preferred. The advantage of polyethylene glycol ether and polyethylene glycol ester is that they are easy to absorb moisture, so that the conductivity of the rubber surface is improved.

[0045] In one embodiment of the present invention, the inorganic antistatic agent includes zinc oxide and / or tin oxide.

[0046] In a specific embodiment of the present invention, the mass ratio of the organic antistatic agent to the inorganic antistatic agent is 0.7 to 5:1.

[0047] In one specific embodiment of the present invention, the structural formula of polysiloxane is shown in Formula 1:

[0048]

[0049] R 1 , R 2 , R 6 , R 7 , R 8 and R 9 Each independently includes any one or a combination of at least two of a halogen atom, -CN, -SCN, -NCO, a methyl group, an ethyl group, a n-propyl group, an isopropyl group, a n-butyl group, an isobutyl group, a tert-butyl group, a n-butyl group, an isobutyl group, an isopentane group, a neopentyl group, a tert-pentyl group, a hexyl group, a phenyl group or a tolyl group;

[0050] R 3 , R 5 and R 10 are independently any one of a group containing a carbon-carbon double bond and / or a carbon-carbon triple bond, a halogen atom, -CN, -SCN, -NCO, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group, an n-butyl group, an isobutyl group, an isopentane group, a neopentyl group, a tert-pentyl group, a hexyl group, a phenyl group or a tolyl group, or a combination of at least two thereof;

[0051] R 4 A group containing a carbon-carbon double bond and / or a carbon-carbon triple bond;

[0052] The group containing a carbon-carbon double bond and / or a carbon-carbon triple bond includes any one of vinyl, propenyl, methallyl, 1-propenyl, ethynyl, butadienyl, hexadienyl, vinylphenyl or styryl;

[0053] x is a natural number from 1 to 580, and y is a natural number from 1 to 11500.

[0054] Among them, x can be 1, 10, 100, 150, 200, 250, 300, 500 or 580, etc., and y can be 1, 100, 200, 500, 1000, 1500, 2000, 2500, 5000, 7500, 10000 or 11500, etc., but are not limited to the listed values, and other values ​​not listed within the above numerical ranges are also applicable.

[0055] In a specific embodiment of the present invention, the structure of the polysiloxane may be a linear, cyclic or branched structure, or a resin-like or network-like structure.

[0056] In one embodiment of the present invention, the molecular weight of the polysiloxane is preferably 10 5 ~1×10 6 g(temperature 25℃).

[0057] In one specific embodiment of the present invention, the structure of the polysiloxane is preferably a structure shown in Formula 2 or Formula 3:

[0058]

[0059] Here, m is a natural number from 1 to 11500, and n is a natural number from 1 to 580.

[0060] In one specific embodiment of the present invention, the reinforcing agent includes fumed silica.

[0061] In one embodiment of the present invention, the specific surface area of ​​fumed silica is 150 to 400 m 2 / g, such as 150m 2 / g, 200m 2 / g, 250m 2 / g、300m 2 / g, 350m 2 / g or 400m 2 / g, etc., but are not limited to the listed values, other values ​​not listed in the numerical range are also applicable, preferably 300m 2 / g.

[0062] In a specific embodiment of the present invention, the structuring control agent includes any one of hexamethyldisilazane, hydroxy silicone oil, dimethyldiethoxysilane, methyltrimethoxysilane, alkoxy silicone oil, hydroxyl-terminated vinyl silicone oil, diphenylsilanediol or triphenylsilanol, or a combination of at least two thereof.

[0063] In a specific embodiment of the present invention, the viscosity η of the hydroxy silicone oil is 15 to 1000 mPa·s, such as 15 mPa·s, 20 mPa·s, 25 mPa·s, 50 mPa·s, 100 mPa·s, 200 mPa·s, 500 mPa·s or 1000 mPa·s, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0064] In a specific embodiment of the present invention, the viscosity η of the alkoxy silicone oil is 15 to 1000 mPa·s, such as 15 mPa·s, 20 mPa·s, 25 mPa·s, 50 mPa·s, 100 mPa·s, 200 mPa·s, 500 mPa·s or 1000 mPa·s, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0065] In a specific embodiment of the present invention, the vinyl content of the hydroxyl-terminated vinyl silicone oil is 0.3-10%, such as 0.3%, 0.5%, 1%, 2%, 5%, 8% or 10%, etc.; the viscosity η is 15-1000mPa·s, such as 15mPa·s, 20mPa·s, 25mPa·s, 50mPa·s, 100mPa·s, 200mPa·s, 500mPa·s or 1000mPa·s, etc., but is not limited to the listed values, and other unlisted values ​​within the above numerical ranges are equally applicable.

[0066] In one specific embodiment of the present invention, the structuring control agent is preferably a hydroxyl-terminated vinyl silicone oil having a vinyl content of 1.8% and a viscosity η of 20 mPa·s.

[0067] In a specific embodiment of the present invention, the anti-yellowing auxiliary agent includes hydrogen-containing silicone oil, the viscosity η of the hydrogen-containing silicone oil is 15-100mPa·s, and H%=0.3-1.2wt%. Wherein, the viscosity η can be 15mPa·s, 20mPa·s, 25mPa·s, 30mPa·s, 40mPa·s, 50mPa·s, 60mPa·s, 70mPa·s, 80mPa·s, 90mPa·s or 100mPa·s, etc., and H% can be 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1% or 1.2%, etc., but are not limited to the listed values, and other unlisted values ​​within the above numerical ranges are also applicable. Preferably, it is 30mPa·s, and H%=1.0wt%.

[0068] In one embodiment of the present invention, the internal mold release agent includes stearic acid and / or stearate.

[0069] In one embodiment of the present invention, the stearate includes any one of zinc stearate, calcium stearate or magnesium stearate, or a combination of at least two thereof.

[0070] In a specific embodiment of the present invention, the vulcanizing agent includes any one or a combination of at least two of dibenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert-butyl perbenzoate, di-tert-butyl peroxide, dicumyl peroxide or 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane. Preferably, it is 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane.

[0071] A specific embodiment of the present invention provides a method for preparing an antistatic silicone rubber composition, the preparation method comprising:

[0072] The base rubber is obtained by mixing a polysiloxane containing at least three aliphatic unsaturated groups, a reinforcing agent, a structural control agent and an anti-yellowing aid;

[0073] The base rubber material is mixed with the internal mold release agent, the antistatic agent and the vulcanizing agent, and then the mixture is kneaded and thinned to obtain a rubber mixture;

[0074] The mixed rubber is subjected to compression molding and secondary vulcanization to obtain an antistatic silicone rubber composition.

[0075] In a specific embodiment of the present invention, the mixing temperature is 80-150°C and the mixing time is 1-2h. The temperature may be 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C or 150°C, and the mixing time may be 1h, 1.2h, 1.5h, 1.8h or 2h, but the above values ​​are not limited thereto. Other values ​​not listed in the above ranges are also applicable.

[0076] In a specific embodiment of the present invention, after the mixing, the low molecular weight substances are removed under the conditions of temperature of 80 to 150°C and vacuum degree of -0.06MPa to -0.08MPa for 1 to 2 hours. The temperature may be 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C or 150°C, the vacuum degree may be -0.06MPa, -0.065MPa, -0.07MPa, -0.075MPa or -0.08MPa, the time may be 1h, 1.2h, 1.5h, 1.8h or 2h, but are not limited to the listed values. Other values ​​not listed within the above numerical ranges are also applicable. The low molecular weight substances refer to water, polysiloxane with low polymerization degree, D 3 -D 10 wait.

[0077] In a specific embodiment of the present invention, the number of thin passes is not less than 3 times.

[0078] In a specific embodiment of the present invention, the conditions for open refining and thin passing, such as temperature and time, can be specifically selected according to the raw materials and production needs, and are not further limited herein.

[0079] In a specific embodiment of the present invention, the temperature of the compression molding is 110-180°C, and the time is 10-20 minutes. The temperature can be 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C or 180°C, and the time can be 10 minutes, 12 minutes, 15 minutes, 18 minutes or 20 minutes, but are not limited to the listed values. Other values ​​not listed within the above ranges are also applicable.

[0080] In a specific embodiment of the present invention, the temperature of the secondary vulcanization is 180-250°C, and the time is 3-5h. The temperature may be 180°C, 190°C, 200°C, 210°C, 220°C, 230°C, 240°C or 250°C, and the time may be 3h, 3.2h, 3.5h, 4h, 4.2h, 4.5h or 5h, but are not limited to the listed values, and other values ​​not listed within the above ranges are also applicable.

[0081] For the convenience of understanding the present invention, the present invention lists the following embodiments. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0082] Example 1

[0083] This embodiment provides a method for preparing an antistatic silicone rubber composition, the preparation method comprising:

[0084] The polysiloxane containing unsaturated groups, the reinforcing agent, the structural control agent and the anti-yellowing aid are mixed at 100° C. for 2 hours, and then low molecular weight substances are removed at 120° C. and a vacuum degree of -0.06 MPa to -0.08 MPa for 2 hours to obtain a base rubber compound;

[0085] The base rubber material is mixed with the internal mold release agent, the antistatic agent and the vulcanizing agent, and the mixture is firstly kneaded, and then thinned for 3 times to obtain a mixed rubber;

[0086] The mixed rubber was compression molded at 150° C. for 15 minutes and post-cured at 200° C. for 4 hours to obtain an antistatic silicone rubber composition.

[0087] The raw materials and addition amounts of the antistatic silicone rubber composition are shown in Table 1.

[0088] Table 1

[0089]

[0090] Example 2

[0091] In this embodiment, except for the raw materials and the addition amount of the antistatic silicone rubber composition, other conditions are the same as those in Example 1. The raw materials and the addition amount are shown in Table 2.

[0092] Table 2

[0093]

[0094]

[0095] Example 3

[0096] In this embodiment, except for the raw materials and the addition amount of the antistatic silicone rubber composition, other conditions are the same as those in Embodiment 1. The raw materials and the addition amount are shown in Table 3.

[0097] Table 3

[0098]

[0099]

[0100] Example 4

[0101] In this embodiment, except for the raw materials and the addition amount of the antistatic silicone rubber composition, other conditions are the same as those in Example 1. The raw materials and the addition amount are shown in Table 4.

[0102] Table 4

[0103]

[0104] Example 5

[0105] In this embodiment, except for the raw materials and the addition amount of the antistatic silicone rubber composition, other conditions are the same as those in Example 1. The raw materials and the addition amount are shown in Table 5.

[0106] Table 5

[0107]

[0108] Example 6

[0109] In this embodiment, except for the raw materials and the addition amount of the antistatic silicone rubber composition, other conditions are the same as those in Example 1. The raw materials and the addition amount are shown in Table 6.

[0110] Table 6

[0111]

[0112]

[0113] Example 7

[0114] In this embodiment, except for the raw materials and the addition amount of the antistatic silicone rubber composition, other conditions are the same as those in Example 1. The raw materials and the addition amount are shown in Table 7.

[0115] Table 7

[0116]

[0117]

[0118] Example 8

[0119] In this embodiment, except for the raw materials and the addition amount of the antistatic silicone rubber composition, other conditions are the same as those in Example 1. The raw materials and the addition amount are shown in Table 8.

[0120] Table 8

[0121]

[0122] Example 9

[0123] This embodiment provides a method for preparing an antistatic silicone rubber composition, the preparation method comprising:

[0124] The polysiloxane containing unsaturated groups, the reinforcing agent, the structural control agent and the anti-yellowing aid are mixed at 80° C. for 2 hours, and then the low molecular weight substances are removed at 80° C. and a vacuum degree of -0.06 MPa to -0.08 MPa for 2 hours to obtain a base rubber compound;

[0125] The base rubber material is mixed with the internal mold release agent, the antistatic agent and the vulcanizing agent, and the mixture is firstly kneaded, and then thinned for 3 times to obtain a mixed rubber;

[0126] The mixed rubber was compression molded at 110° C. for 20 minutes and post-cured at 180° C. for 5 hours to obtain an antistatic silicone rubber composition.

[0127] The raw materials and addition amount of the antistatic silicone rubber composition are the same as those in Example 1.

[0128] Example 10

[0129] This embodiment provides a method for preparing an antistatic silicone rubber composition, the preparation method comprising:

[0130] The polysiloxane containing unsaturated groups, the reinforcing agent, the structural control agent and the anti-yellowing aid are mixed at 150° C. for 1 hour, and then the low molecular weight substances are removed at 150° C. and a vacuum degree of -0.06 MPa to -0.08 MPa for 1 hour to obtain a base rubber compound;

[0131] The base rubber material is mixed with the internal mold release agent, the antistatic agent and the vulcanizing agent, and the mixture is firstly kneaded, and then thinned for 3 times to obtain a mixed rubber;

[0132] The mixed rubber was compression molded at 180° C. for 10 minutes and post-cured at 250° C. for 3 hours to obtain an antistatic silicone rubber composition.

[0133] The raw materials and addition amount of the antistatic silicone rubber composition are the same as those in Example 1.

[0134] Comparative Example 1

[0135] In this comparative example, except that only 19 g of polyethylene glycol ether is used as the antistatic agent, other conditions are the same as those in Example 1.

[0136] Comparative Example 2

[0137] In this comparative example, except that only 19 g of polyacryloyloxyethyl trimethyl ammonium chloride was used as the antistatic agent, other conditions were the same as those in Example 1.

[0138] Comparative Example 3

[0139] In this comparative example, except that only 19 g of tin oxide was used as the antistatic agent, other conditions were the same as those in Example 1.

[0140] Comparative Example 4

[0141] In this comparative example, except that only 12.2 g of polyethylene glycol ether and 6.8 g of polyacryloyloxyethyl trimethyl ammonium chloride were used as the antistatic agent, the other conditions were the same as those in Example 1.

[0142] Comparative Example 5

[0143] In this comparative example, except that only 12.2 g of polyethylene glycol ether and 6.8 g of tin oxide were used as the antistatic agent, the other conditions were the same as those in Example 1.

[0144] Comparative Example 6

[0145] In this comparative example, except that only 9.5 g of polyacryloyloxyethyl trimethyl ammonium chloride and 9.5 g of tin oxide were used as the antistatic agent, the other conditions were the same as those in Example 1.

[0146] Comparative Example 7

[0147] In this comparative example, tin oxide is added during the preparation process, polyethylene glycol ether and polyacryloyloxyethyl trimethyl ammonium chloride are applied to the surface of the silicone rubber composition by coating, and the other conditions are the same as those in Example 1.

[0148] Comparative Example 8

[0149] In this comparative example, tin oxide was not added, and the polyethylene glycol ether and polyacryloyloxyethyl trimethyl ammonium chloride were applied to the surface of the silicone rubber composition by coating, and the other conditions were the same as those in Example 1.

[0150] The vinyl rubber used in Examples 1-10 and Comparative Examples 1-8 is the polysiloxane represented by Formula 2 and Formula 3.

[0151] The mechanical properties and antistatic properties of the silicone rubber compositions provided in Examples 1-10 and Comparative Examples 1-8 were tested, and the test results and test methods are shown in Table 9.

[0152] Table 9

[0153]

[0154]

[0155]

[0156] It can be seen from the test results of Examples 1-10 that the silicone rubber composition provided by the present application has excellent antistatic properties and mechanical properties, wherein the antistatic test result of Example 5 is slightly worse than that of other examples, mainly because the amount of antistatic agent added is relatively small. Comparative Example 1 only uses an organic antistatic agent, Comparative Example 2 only uses a surfactant antistatic agent, and Comparative Example 3 only uses an inorganic antistatic agent. Although the initial antistatic properties of the silicone rubber compositions provided by Comparative Examples 1-3 are all good, the stability is poor. After 1000h and 6 months, the antistatic effect has decreased to varying degrees. Comparative Example 4 does not use an inorganic antistatic agent, Comparative Example 5 does not use a surfactant antistatic agent, and Comparative Example 6 does not use an organic antistatic agent. Although the stability of the antistatic effect is slightly improved compared with Comparative Examples 1-3, it is still weaker than Example 1. Comparative Examples 7 and 8 respectively apply antistatic agents by surface coating, and their initial antistatic effects are excellent, but the antistatic effect is fast in aging and cannot be used for a long time.

[0157] The applicant declares that the present invention illustrates the detailed process equipment and process flow of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed process equipment and process flow, that is, it does not mean that the present invention must rely on the above-mentioned detailed process equipment and process flow to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. An antistatic silicone rubber composition, characterized in that: In parts by weight, the antistatic silicone rubber composition comprises: The antistatic agent includes an organic antistatic agent and an inorganic antistatic agent.

2. The antistatic silicone rubber composition according to claim 1, characterized in that: The structural formula of the polysiloxane is shown in Formula 1: R1, R2, R6, R7, R8 and R9 independently include any one or a combination of at least two of a halogen atom, -CN, -SCN, -NCO, a methyl group, an ethyl group, a n-propyl group, an isopropyl group, a n-butyl group, an isobutyl group, a tert-butyl group, a n-butyl group, an isobutyl group, an isopentane group, a neopentyl group, a tert-pentyl group, a hexyl group, a phenyl group or a tolyl group; R3, R5 and R 10 are independently any one of a group containing a carbon-carbon double bond and / or a carbon-carbon triple bond, a halogen atom, -CN, -SCN, -NCO, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group, an n-butyl group, an isobutyl group, an isopentane group, a neopentyl group, a tert-pentyl group, a hexyl group, a phenyl group or a tolyl group, or a combination of at least two thereof; R4 is a group containing a carbon-carbon double bond and / or a carbon-carbon triple bond; The group containing a carbon-carbon double bond and / or a carbon-carbon triple bond includes any one of vinyl, propenyl, methallyl, 1-propenyl, ethynyl, butadienyl, hexadienyl, vinylphenyl or styryl; x is a natural number from 1 to 580, and y is a natural number from 1 to 11500.

3. The antistatic silicone rubber composition according to claim 1, characterized in that: The reinforcing agent includes fumed silica; The specific surface area of ​​the fumed silica is 150 to 400 m 2 / g.

4. The antistatic silicone rubber composition according to claim 1, characterized in that: The structural control agent includes any one of hexamethyldisilazane, hydroxy silicone oil, dimethyldiethoxysilane, methyltrimethoxysilane, alkoxy silicone oil, hydroxyl-terminated vinyl silicone oil, diphenylsilanediol or triphenylsilanol, or a combination of at least two thereof.

5. The antistatic silicone rubber composition according to claim 1, characterized in that: The anti-yellowing auxiliary agent includes hydrogen-containing silicone oil; The viscosity of the hydrogen-containing silicone oil is 15-100 mPa·s, and H% is 0.3-1.2 wt%.

6. The antistatic silicone rubber composition according to claim 1, characterized in that: The internal mold release agent includes stearic acid and / or stearate; The stearate includes any one of zinc stearate, calcium stearate or magnesium stearate, or a combination of at least two of them.

7. The antistatic silicone rubber composition according to claim 1, characterized in that: The vulcanizing agent includes any one of dibenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert-butyl perbenzoate, di-tert-butyl peroxide, dicumyl peroxide or 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane, or a combination of at least two thereof.

8. The antistatic silicone rubber composition according to claim 1, characterized in that: The organic antistatic agent includes any one of polyethylene glycol ether, polyethylene glycol ester, morpholine hydrochloride, sulfonate cetyltrimethylammonium bromide, sodium lauryl sulfate or polyacryloyloxyethyltrimethylammonium chloride; Inorganic antistatic agents include zinc oxide and / or tin oxide.

9. A method for preparing an antistatic silicone rubber composition, characterized in that: The preparation method comprises: The polysiloxane containing at least three aliphatic unsaturated groups, a reinforcing agent, a structural control agent and an anti-yellowing aid are mixed to obtain a base rubber material; The base rubber material is mixed with the internal mold release agent, the antistatic agent and the vulcanizing agent for open mixing and thin passing to obtain a mixed rubber; The mixed rubber is subjected to compression molding and secondary vulcanization to obtain the antistatic silicone rubber composition.

10. The preparation method according to claim 9, characterized in that: The temperature of the compression molding is 110-180°C.

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