Antistatic silicone rubber product as well as preparation method and application thereof

Abstract

The invention provides an antistatic silicone rubber product as well as a preparation method and application thereof, and belongs to the technical field of high polymer material processing. The preparation method of the antistatic silicone rubber product comprises the following steps: mixing raw silicone rubber, a hydrophilic comonomer, a conductive filler and a cross-linking agent to obtain a premixed rubber material; carrying out microwave treatment on the premixed rubber material to obtain a preliminarily grafted pretreated rubber material; and carrying out vulcanization molding on the pretreated rubber material to obtain the antistatic silicone rubber product.

Description

Technical Field

[0001] This application relates to the field of polymer material processing technology, and in particular to an antistatic silicone rubber product, its preparation method and application. Background Technology

[0002] Silicone rubber is used in cigarette filters due to its excellent high temperature resistance, flexibility and chemical stability. However, its high hydrophobicity can easily lead to static electricity accumulation, causing cigarette filter to easily attract tobacco dust near the lip end, which seriously affects the product's appearance and user experience.

[0003] In related technologies, static electricity accumulation in silicone rubber is reduced by adding conductive fillers or coating the surface with an antistatic coating. However, these methods can easily reduce the mechanical properties and durability of silicone rubber. Summary of the Invention

[0004] In view of this, this application provides an antistatic silicone rubber product, its preparation method, and its application.

[0005] According to one embodiment of this application, a method for preparing an antistatic silicone rubber product is provided, comprising the following steps: mixing silicone rubber raw rubber, hydrophilic comonomer, conductive filler, and crosslinking agent to obtain a premixed rubber compound; subjecting the premixed rubber compound to microwave treatment to obtain a pre-grafted pretreated rubber compound; and injecting the pretreated rubber compound into a mold for vulcanization molding to obtain an antistatic silicone rubber product.

[0006] In some embodiments of this application, the power of the microwave treatment is 200W~600W, the frequency is 2.45GHz, and the irradiation time is 3min~10min.

[0007] In some embodiments of this application, the irradiation temperature of the microwave treatment is 60°C to 100°C.

[0008] In some embodiments of this application, the temperature of the above-mentioned vulcanization treatment is 120°C to 160°C, and the vulcanization time is 20 min to 40 min.

[0009] In some embodiments of this application, the hydrophilic comonomer includes at least one of hydroxyethyl acrylate and vinylpyrrolidone.

[0010] In some embodiments of this application, the mass content of the hydrophilic comonomer is 4% to 7% based on the mass of the silicone rubber raw material.

[0011] In some embodiments of this application, the conductive filler includes at least one of zinc oxide nanowires and carbon nanotubes.

[0012] In some embodiments of this application, the mass content of the conductive filler is 2% to 5% based on the mass of the raw silicone rubber.

[0013] In some embodiments of this application, the crosslinking agent includes at least one of dicumyl peroxide and di(2,5-dimethyl)sulfide.

[0014] In some embodiments of this application, the mass content of the crosslinking agent is 0.5% to 2% based on the mass of the silicone rubber raw material.

[0015] According to an embodiment of the second aspect of this application, an antistatic silicone rubber product prepared by the above-described method for preparing antistatic silicone rubber products is provided.

[0016] According to an embodiment of the third aspect of this application, an antistatic cigarette filter rod is provided, which includes the aforementioned antistatic silicone rubber product.

[0017] According to an embodiment of the fourth aspect of this application, a cigarette is provided, the cigarette comprising the antistatic cigarette filter rod described above.

[0018] According to embodiments of this application, hydrophilic comonomers are introduced into the silicone rubber network through chemical bonding, enhancing the hygroscopicity of the silicone rubber and ensuring stable hygroscopicity. Microwave treatment promotes uniform dispersion and rapid polymerization of the monomers, reducing side reactions from traditional heat treatment, while simultaneously activating the conductive filler and further improving conductivity. The synergistic effect of the conductive filler and microwave treatment reduces the volume resistivity of the silicone rubber, thereby achieving long-lasting antistatic properties. Furthermore, microwave treatment promotes uniform crosslinking of the monomers, reduces agglomeration of the conductive filler, maintains the flexibility of the silicone rubber, and improves the mechanical properties of silicone rubber products. Attached Figure Description

[0019] The above and other objects, features and advantages of this application will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0020] Figure 1 A scanning electron microscope image of the premixed adhesive provided in Example 2 is shown;

[0021] Figure 2 A scanning electron microscope image of the pretreated adhesive material for preliminary grafting provided in Example 2 is shown. Detailed Implementation

[0022] The embodiments of this application will be described below. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of this application. In the following detailed description, many specific details are set forth to provide a thorough understanding of the embodiments of this application for ease of explanation. However, it will be apparent that one or more embodiments may be implemented without these specific details. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this application.

[0023] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "comprising" as used herein indicates the presence of features, steps, or operations, but does not exclude the presence or addition of one or more other features.

[0024] When using expressions such as "at least one of A, B, and C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). When using expressions such as "at least one of A, B, or C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.).

[0025] In implementing this application, the inventors typically improve the antistatic properties of silicone rubber through the following means:

[0026] (1) Add conductive fillers: such as carbon black, metal powder, carbon nanotubes, etc. However, high addition amounts will significantly reduce the mechanical properties of silicone rubber (such as tensile strength, elasticity, etc.).

[0027] (2) Surface coating: Apply an antistatic agent (such as quaternary ammonium salt, polyethylene glycol, etc.). However, the coating is easily worn and has poor durability and temperature resistance.

[0028] (3) Chemical modification: surface conductivity is improved by grafting hydrophilic groups, but traditional thermal initiation grafting has low efficiency and may damage the main chain structure of silicone rubber.

[0029] Therefore, there is an urgent need for a preparation technology that can maintain the inherent properties of silicone rubber while providing long-lasting antistatic effects. In the process of realizing this application, it was discovered that molecular design (introducing hydrophilic comonomers) and process innovation (microwave treatment) can enable the prepared silicone rubber products to also possess antistatic properties.

[0030] In view of this, one aspect of this application provides a method for preparing an antistatic silicone rubber product, including steps S10 to S30.

[0031] In step S10, the raw silicone rubber, hydrophilic comonomer, conductive filler, and crosslinking agent are mixed to obtain a premixed rubber compound.

[0032] In step S20, the premixed rubber compound is subjected to microwave treatment to obtain a pre-treated rubber compound with preliminary grafting. This allows for the initial grafting of monomers and prevents premature vulcanization of the rubber compound.

[0033] In step S30, the pretreated rubber compound is vulcanized to obtain an antistatic silicone rubber product.

[0034] According to embodiments of this application, hydrophilic comonomers are introduced into the silicone rubber network through chemical bonding, enhancing the hygroscopicity of the silicone rubber and ensuring stable hygroscopicity. Microwave treatment promotes uniform dispersion and rapid polymerization of the monomers, reducing side reactions from traditional heat treatment, while simultaneously activating the conductive filler and further improving conductivity. The synergistic effect of the conductive filler and microwave treatment reduces the volume resistivity of the silicone rubber, thereby achieving long-lasting antistatic properties. Furthermore, microwave treatment promotes uniform crosslinking of the monomers, reduces agglomeration of the conductive filler, maintains the flexibility of the silicone rubber, and improves the mechanical properties of silicone rubber products.

[0035] This application, through molecular design and process innovation, enables the preparation of silicone rubber products that can balance antistatic properties and mechanical properties, providing a reliable solution for electrostatic protection in the field of silicone rubber products.

[0036] This application does not impose any specific limitations on the material of the silicone rubber product, as long as it achieves the purpose of this application. In some embodiments of this application, the silicone rubber product can meet specific physical properties (such as temperature resistance), processing adaptability, and other requirements. For example, the material of the silicone rubber product can be methyl vinyl silicone rubber, methyl silicone rubber, etc.

[0037] In some embodiments of this application, in step S10, the hydrophilic comonomer can be any hydrophilic monomer that can copolymerize with silicone rubber raw material. This application does not particularly limit the hydrophilic comonomer, as long as it achieves the purpose of this application. For example, the hydrophilic comonomer can be hydroxyethyl acrylate, hydroxyethyl methacrylate, methacrylic acid, etc. Among them, because hydroxyethyl acrylate has advantages such as balancing hydrophilicity and substrate compatibility, and strong reaction controllability, the hydrophilic comonomer is preferably at least one of hydroxyethyl acrylate and vinylpyrrolidone. When the hydrophilic comonomer hydroxyethyl acrylate copolymerizes with silicone rubber raw material, it can undergo a copolymerization reaction with the active groups of the silicone rubber raw material through the unsaturated double bonds in its molecular structure, thereby introducing hydrophilic hydroxyl groups into the silicone rubber molecular chain. This can effectively improve the hydrophilicity of silicone rubber, improve its compatibility and adhesion to polar materials, and maintain the original excellent properties of silicone rubber such as high and low temperature resistance and aging resistance.

[0038] Based on the mass of the silicone rubber raw material, the mass content of the hydrophilic comonomer can be 4% to 7%. For example, based on the mass of the silicone rubber raw material, the mass content of the hydrophilic comonomer can be within any two values ​​of 4%, 4.5%, 5%, 6%, 6.5%, 7%, or more.

[0039] In the process of developing this application, it was discovered that when the mass content of the hydrophilic comonomer exceeds 7%, the resistivity of the silicone rubber product does not continue to decrease significantly. This may be because the hydrophilic comonomer is a polar monomer, while silicone rubber is a non-polar matrix. As the amount of hydrophilic comonomer added increases, their compatibility deteriorates, leading to local aggregation of the hydrophilic comonomer and preventing the effective construction of conductive pathways. Related technologies indicate that an antistatic requirement can be met when the surface resistivity is less than 10^11 Ω; therefore, a maximum mass content of 7% for the hydrophilic comonomer is sufficient. Conversely, if the mass content of the aqueous comonomer is too low, the antistatic performance of the silicone rubber product will be poor.

[0040] In some embodiments of this application, the conductive filler may include at least one of zinc oxide nanowires and carbon nanotubes. Exemplarily, the conductive filler may include zinc oxide nanowires, the conductive filler may include carbon nanotubes, or the conductive filler may include both zinc oxide nanowires and carbon nanotubes. Using zinc oxide nanowires and / or carbon nanotubes as conductive fillers can efficiently construct a conductive network with a relatively low addition amount, reducing the negative impact of the conductive filler on the mechanical properties of the silicone rubber matrix; simultaneously, it can enhance the tensile strength, toughness, and other mechanical properties of silicone rubber through "bridging" and other effects.

[0041] In some embodiments of this application, the mass content of the conductive filler can be 2% to 5% based on the mass of the silicone rubber raw material. Exemplarily, the mass content of the conductive filler can be within any two values ​​of 2%, 2.5%, 3%, 4%, 4.5%, 5%, or more, based on the mass of the silicone rubber raw material. A mass content of conductive filler within the above range can effectively construct a conductive network while reducing the negative impact of the conductive filler on the mechanical properties of the silicone rubber matrix.

[0042] In some embodiments of this application, the crosslinking agent may include at least one of dicumyl peroxide and bis(2,5-diphenyl)sulfide. Exemplarily, the crosslinking agent may include dicumyl peroxide, the crosslinking agent may include bis(2,5-diphenyl)sulfide, or the crosslinking agent may include both dicumyl peroxide and bis(2,5-diphenyl)sulfide. Using dicumyl peroxide and / or bis(2,5-diphenyl)sulfide as crosslinking agents for silicone rubber can efficiently initiate the crosslinking reaction of silicone rubber molecular chains, forming a stable three-dimensional network structure, thereby endowing silicone rubber with excellent mechanical properties and resistance to high and low temperatures, aging, and other characteristics. Both have good applicability in the processing, and the degree of crosslinking can be precisely controlled by adjusting the vulcanization temperature and time to meet different process requirements. Furthermore, both are suitable for industrial production scenarios, helping to improve the stability and consistency of silicone rubber products and providing reliable support for the performance assurance of various silicone rubber products.

[0043] In some embodiments of this application, the mass content of the crosslinking agent can be 0.5% to 2% based on the mass of the silicone rubber raw material. For example, the mass content of the crosslinking agent can be within any two of the following values: 0.5%, 0.8%, 1.0%, 1.2%, 1.5%, 1.8%, 2.0%, or more.

[0044] In some embodiments of this application, in step S20, the microwave treatment power can be 200W~600W, the frequency is 2.45GHz, and the irradiation time can be 3min~10min. Exemplarily, the microwave treatment power can be any two values ​​between 200W, 250W, 300W, 350W, 400W, 450W, 500W, 550W, 600W, or more, and the irradiation time can be any two values ​​between 3min, 4min, 5min, 6min, 7min, 8min, 9min, 10min, or more. When the microwave treatment power, frequency, and irradiation time are within the above ranges, it can better promote uniform dispersion and rapid polymerization of monomers, reduce side reactions of traditional heat treatment, activate conductive fillers, further improve the conductivity of silicone rubber products, and further reduce conductive filler agglomeration, maintain the flexibility of silicone rubber, and improve the mechanical properties of silicone rubber products. The microwave pretreatment time required in this application is shorter, and energy consumption is reduced; the microwave pretreatment time is only 1 / 5 of that of traditional heat treatment, and energy consumption is reduced by more than 30%.

[0045] In some embodiments of this application, in step S20, the irradiation temperature of the microwave treatment can be 60°C to 100°C. Exemplarily, the irradiation temperature of the microwave treatment can be any two of the following values: 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C, 100°C. An irradiation temperature within the above range can prevent premature vulcanization of the premixed rubber compound.

[0046] In some embodiments of this application, in step S30, the vulcanization molding method is not particularly limited, as long as it achieves the purpose of this application. Those skilled in the art can select a suitable vulcanization molding method according to actual needs. For example, the vulcanization molding method can be extrusion vulcanization, which refers to the process of continuously shaping the pretreated rubber compound and simultaneously completing vulcanization through an extruder. This can be achieved through automatic feeding, screw pulling, pre-forming with a special mold, and then baking and curing at high temperatures (first stage temperature 500~700℃, second stage temperature 190~240℃). Alternatively, it can be cut to the required length using an automatic machine and subjected to a second baking (or post-vulcanization or two-stage vulcanization). The second baking temperature is 190~210℃, and the time is 0.5~1.5 hours, to improve the performance of the antistatic silicone rubber product and remove odors.

[0047] In step S30, the extrusion rate of the extrusion vulcanization can be 3~15 cm / s.

[0048] Extrusion vulcanization temperature and extrusion rate within the above range can ensure that the crosslinking reaction is sufficient and uniform. This avoids incomplete vulcanization due to excessively low temperature or insufficient time, which would result in insufficient mechanical properties and poor aging resistance of the product. It also prevents over-vulcanization due to excessively high temperature or excessive time, which would cause the material to become brittle, have abnormal hardness, and experience a decline in performance. At the same time, it helps to stabilize the dimensional accuracy of silicone rubber products, reduce shrinkage or deformation, and improve production efficiency and product quality stability.

[0049] In step S30, this application does not specifically limit the structure and material of the mold, as long as it can achieve the purpose of this application. Those skilled in the art can select a suitable mold according to actual needs to prepare suitable silicone rubber products. For example, the mold material can include metal (such as aluminum alloy, mold steel), silicone, resin, etc. Among them, metal molds have high strength, high wear resistance, and long service life, making them suitable for mass production of high-precision products. Complex cavities can be manufactured through CNC machining, EDM, and other processes. Silicone molds, due to their short production cycle, low cost, and good flexibility, are suitable for small-batch trial production or products with complex shapes, and can accurately replicate prototype details. Resin molds fall between the two, balancing a certain level of precision and economy.

[0050] According to an embodiment of the second aspect of this application, an antistatic silicone rubber product prepared by the above-described method is provided. The silicone rubber product provided in this application embodiment can achieve long-lasting antistatic properties while also possessing good mechanical properties and durability.

[0051] This application does not impose any particular restrictions on the structure of antistatic silicone rubber products, as long as the purpose of this application is achieved. Those skilled in the art can design antistatic silicone rubber products with different structures according to actual needs.

[0052] According to an embodiment of the third aspect of this application, an antistatic cigarette filter rod is provided, comprising the aforementioned antistatic silicone rubber product. The antistatic cigarette filter rod provided by this application exhibits no static electricity accumulation, making it less prone to attracting tobacco dust near the lip end, resulting in a better user experience. The antistatic cigarette filter rod effectively balances antistatic properties with mechanical performance.

[0053] This application does not specifically limit the structure of the silicone rubber product used for antistatic cigarette filter rods, as long as it achieves the purpose of this application. Silicone rubber products with different structures can be designed according to different requirements of antistatic cigarette filter rods. For example, the silicone rubber product can be a silicone rubber cylinder, which may include a first through hole and a second through hole parallel to the axis. The diameter of the first through hole can be larger than that of the second through hole. The first through hole is located at the center of the silicone rubber cylinder, and multiple second through holes are evenly distributed along the circumference of the silicone rubber cylinder.

[0054] This application does not impose any particular limitation on the specific structure of the antistatic cigarette filter rod, as long as it achieves the purpose of this application. Antistatic cigarette filter rods with different structures can be designed according to different requirements. For example, an antistatic cigarette filter rod may include a silicone rubber product, a cured adhesive, and a forming paper. The silicone rubber product and the forming paper are bonded together by the adhesive.

[0055] According to an embodiment of the fourth aspect of this application, a cigarette is provided, which includes the aforementioned antistatic cigarette filter rod. The antistatic cigarette filter rod segment of the cigarette provided by this application has no static electricity accumulation, making it less likely for tobacco dust to adhere to the near-lip end of the filter rod, resulting in a better user experience.

[0056] This application does not specifically limit the type of cigarette, as long as it achieves the purpose of this application. For example, the cigarette in this application can be a conventional cigarette or a heated tobacco product. In the case of a conventional cigarette, it may further include tobacco segments. In the case of a heated tobacco product, it may further include a smoke-generating segment, a support segment, a cooling segment, etc.

[0057] The present invention will now be described in detail with reference to embodiments to facilitate understanding of the invention by those skilled in the art. It is particularly important to note that the embodiments are merely illustrative of the invention and should not be construed as limiting the scope of protection of the invention. Non-essential improvements and adjustments made to the invention by those skilled in the art based on the above description should still fall within the scope of protection of the invention. Furthermore, any raw materials mentioned below that are not described in detail are commercially available products; any process steps or preparation methods not mentioned in detail are process steps or preparation methods known to those skilled in the art.

[0058] Example 1

[0059] This embodiment provides an antistatic silicone rubber product and its preparation method, including the following steps:

[0060] (1) Mix 100 parts by weight of methyl vinyl silicone rubber raw rubber, 4 parts by weight of hydrophilic comonomer hydroxyethyl acrylate, and 3 parts by weight of conductive filler zinc oxide nanowires in a mixer at 80°C for 15 minutes.

[0061] After adding 1.5 parts by weight of the crosslinking agent dicumyl peroxide, continue mixing for 5 minutes to obtain the premixed rubber compound.

[0062] (2) The premixed rubber compound was placed in a microwave reactor and irradiated for 5 minutes under microwave power of 500 W and frequency of 2.45 GHz, with the temperature controlled at 80℃, to obtain the pretreated rubber compound with preliminary grafting.

[0063] (3) The pretreated rubber compound is rapidly extruded at 500°C at a rate of 3 cm / s to complete the vulcanization, thereby obtaining antistatic silicone rubber products.

[0064] Example 2

[0065] This embodiment provides an antistatic silicone rubber product and its preparation method, including the following steps:

[0066] (1) Mix 100 parts by weight of methyl vinyl silicone rubber raw rubber, 7 parts by weight of hydrophilic comonomer hydroxyethyl acrylate, and 2 parts by weight of conductive filler carbon nanotubes in a mixer at 80°C for 15 minutes.

[0067] After adding 1 part by weight of crosslinking agent bis(2,5) vulcanizing agent, continue mixing for 5 minutes to obtain premixed rubber compound.

[0068] (2) The premixed rubber compound was placed in a microwave reactor and irradiated for 8 minutes under microwave power of 400 W and frequency of 2.45 GHz, with the temperature controlled at 80℃, to obtain the pretreated rubber compound with preliminary grafting.

[0069] (3) The pretreated rubber compound is extruded at 500°C at a rate of 3 cm / s and vulcanized at the same time to obtain antistatic silicone rubber products.

[0070] Example 3

[0071] This embodiment provides an antistatic silicone rubber product and its preparation method. Referring to Embodiment 2, the difference is that in this embodiment, the hydrophilic comonomer hydroxyethyl acrylate is 10 parts by weight.

[0072] Example 4

[0073] This embodiment provides an antistatic silicone rubber product and its preparation method. Referring to Embodiment 2, the difference is that in this embodiment, the hydrophilic comonomer hydroxyethyl acrylate is 1 part by weight.

[0074] Comparative Example 1

[0075] This comparative example provides an antistatic silicone rubber product and its preparation method. Referring to Example 2, the difference is that the hydrophilic comonomer hydroxyethyl acrylate was not added in step (1) of this comparative example.

[0076] Comparative Example 2

[0077] This comparative example provides an antistatic silicone rubber product and its preparation method. Referring to Example 2, the difference is that conductive filler carbon nanotubes were not added in step (1) of this comparative example.

[0078] Comparative Example 3

[0079] This comparative example provides an antistatic silicone rubber product and its preparation method. Referring to Example 2, the difference is that the microwave treatment in step (2) was not performed in this comparative example.

[0080] Comparative Example 4

[0081] This comparative example provides an antistatic silicone rubber product and its preparation method. Referring to Example 2, the difference is that step (2) in this comparative example is:

[0082] The premixed rubber compound was placed in a water bath and pretreated at 80°C for 10 minutes to obtain the pretreated rubber compound for preliminary grafting.

[0083] Comparative Example 5

[0084] This comparative example provides an antistatic silicone rubber product and its preparation method. Referring to Example 2, the difference is that in step (1) of this comparative example, conductive filler carbon nanotubes and hydrophilic comonomer hydroxyethyl acrylate were not added, and the microwave treatment in step (2) was not performed.

[0085] Figure 1 A scanning electron microscope image of the antistatic silicone rubber product of Comparative Example 3 without microwave treatment is shown. Figure 2 A scanning electron microscope (SEM) image of the microwave-treated antistatic silicone rubber product of Example 2 is shown. Figure 1 It can be seen that in samples that have not undergone microwave treatment, the filler aggregates are significantly agglomerated. From Figure 2 It can be seen that the filler is uniformly dispersed in the sample after microwave treatment, forming a continuous conductive network.

[0086] Antistatic performance tests were conducted on all antistatic silicone rubber products provided in the examples and comparative examples. In addition, mechanical strength and abrasion volume tests were performed on the antistatic silicone rubber products provided in Examples 1-2 and Comparative Examples 3-5. Antistatic performance tests were conducted according to standard GB / T 40719-2021 "Determination of Volume and / or Surface Resistivity of Vulcanized Rubber or Thermoplastic Rubber," mechanical strength tests were conducted according to standard GB / T 528-2009 "Determination of Tensile Stress-Strain Properties of Vulcanized Rubber or Thermoplastic Rubber," and abrasion volume tests were conducted according to standard GB / T 9867-2008 "Determination of Abrasion Resistance of Vulcanized Rubber or Thermoplastic Rubber (Rotating Roller Abrasion Tester Method)." The relevant test results are detailed in Table 1.

[0087] Table 1

[0088]

[0089] As shown in Table 1, the antistatic silicone rubber products provided in this application have better antistatic and mechanical properties than the comparative examples. The antistatic silicone rubber products provided in this application have a surface resistivity of 10^9-10^10 Ω / sq, a tensile strength ≥8 MPa, and an elongation at break ≥300%.

[0090] As can be seen from the surface resistivity data of Examples 2-4, when the weight percentage of the hydrophilic comonomer hydroxyethyl acrylate exceeds 7%, the resistivity does not continue to decrease significantly. This may be because hydroxyethyl acrylate is a polar monomer, while silicone rubber is a non-polar matrix. As the amount of hydroxyethyl acrylate added increases, their compatibility deteriorates, leading to localized aggregation of hydroxyethyl acrylate and preventing the effective construction of conductive pathways. Related technologies indicate that a surface resistivity of less than 10... 11 When the Ω value is reached, the antistatic requirement can be met, so the amount of hydroxyethyl acrylate added should be 7 parts by weight.

[0091] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for preparing an antistatic silicone rubber product, characterized in that, Includes the following steps: Silicone rubber raw material, hydrophilic comonomer, conductive filler, and crosslinking agent are mixed to obtain a premixed compound; The premixed adhesive is subjected to microwave treatment to obtain a pre-treated adhesive for preliminary grafting. The pretreated rubber compound is vulcanized to obtain an antistatic silicone rubber product.

2. The method for preparing antistatic silicone rubber products according to claim 1, characterized in that, The microwave treatment has a power of 200W~600W, a frequency of 2.45GHz, and an irradiation time of 3min~10min.

3. The method for preparing antistatic silicone rubber products according to claim 2, characterized in that, The irradiation temperature for microwave treatment is 60℃~100℃.

4. The method for preparing antistatic silicone rubber products according to claim 1, characterized in that, The hydrophilic comonomer includes at least one of hydroxyethyl acrylate and vinylpyrrolidone.

5. The method for preparing the antistatic silicone rubber product according to any one of claims 1 to 4, characterized in that, Based on the quality of the raw silicone rubber, the mass content of the hydrophilic comonomer is 4% to 7%.

6. The method for preparing the antistatic silicone rubber product according to any one of claims 1 to 4, characterized in that, The conductive filler includes at least one of zinc oxide nanowires and carbon nanotubes. Based on the quality of the raw silicone rubber, the mass content of the conductive filler is 2% to 5%.

7. The method for preparing the antistatic silicone rubber product according to any one of claims 1 to 4, characterized in that, The crosslinking agent includes at least one of dicumyl peroxide and di(2,5)sulfide. Based on the quality of the raw silicone rubber, the mass content of the crosslinking agent is 0.5% to 2%.

8. An antistatic silicone rubber product prepared by any one of claims 1 to 7.

9. An antistatic cigarette filter rod, characterized in that, The antistatic cigarette filter rod includes the antistatic silicone rubber product as described in claim 8.

10. A cigarette, characterized in that, The cigarette includes the antistatic cigarette filter rod as described in claim 9.

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