Single-component organic silicon rubber and production process thereof

Abstract

The invention relates to the technical field of organic silicon rubber, and discloses single-component organic silicon rubber and a production process thereof. Comprising the following components in parts by weight: 60-80 parts of a polysiloxane base polymer containing vinyl and phenyl, 5-10 parts of a composite cross-linking agent, 0.5-2 parts of an organic tin-amine composite curing accelerator, 10-15 parts of surface modified composite filler, 1-3 parts of an antioxidant, 0.5-2 parts of an ultraviolet light absorber, 2-5 parts of a montmorillonite intercalation body and 1-3 parts of a dynamic imine bond cross-linking agent. And 0.5 to 1.5 parts of a silane coupling agent. A double cross-linked network and ternary composite filler system is constructed through single-component organic silicon rubber by virtue of a multi-component synergistic effect, so that mechanical property enhancement, aging resistance improvement, oxygen barrier property enhancement, self-repairing function perfection and processability optimization are realized; the problems of incomplete curing and short service life caused by a single crosslinking system of a traditional product are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of organic silicone rubber, in particular to single-component organic silicone rubber and a production process thereof. Background Art

[0002] In the current production and application of silicone rubber, especially single-component silicone rubber, traditional products mostly rely on a single cross-linking system to build the rubber's internal structure. It is common to use only a single type of cross-linking agent, such as a single hydrogen-containing silicone oil, for the cross-linking reaction. This single cross-linking system has obvious limitations. On the one hand, due to the relatively simple cross-linking method, the cross-linking reaction is difficult to fully proceed, and incomplete curing is prone to occur. This leaves areas of insufficient cross-linking within the rubber product, resulting in an overall structure that is not dense enough and mechanical properties that do not reach ideal levels. Local deformation or even breakage is prone to occur when subjected to external forces. On the other hand, the cross-linking network constructed by a single cross-linking system is not stable and complete. During the long-term use of rubber products, the cross-linking network is easily damaged by complex external environmental factors such as temperature changes, humidity, and corrosion from various chemicals. This accelerates the aging process of the rubber and significantly reduces its service life. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the present invention provides a single-component silicone rubber and a production process thereof, which solves the problem of incomplete curing and short service life of traditional products caused by a single cross-linking system.

[0004] To achieve the above objectives, the present invention is implemented through the following technical scheme: a single-component silicone rubber, comprising the following components, by weight: 60-80 parts of a polysiloxane base polymer containing vinyl and phenyl, 5-10 parts of a composite crosslinking agent, 0.5-2 parts of an organic tin-amine composite curing accelerator, 10-15 parts of a surface-modified composite filler, 1-3 parts of an antioxidant, 0.5-2 parts of an ultraviolet absorber, 2-5 parts of a montmorillonite intercalant, 1-3 parts of a dynamic imine bond crosslinker, and 0.5-1.5 parts of a silane coupling agent.

[0005] By adopting the above technical solution, the single-component silicone rubber contains each component in specific weight parts, which has significant beneficial effects and good mechanical properties, with a tensile strength of 6-8MPa, an elongation at break of 300%-350%, and a tear strength of 20-25kN / m; it has excellent aging resistance and stable performance under complex environments such as high temperature and light; it has good self-repair function, with a microcrack repair efficiency of 80% and above and a strength recovery rate of 75% and above, which extends the service life; it has good processing performance, with a filler dispersion of more than 90%, small fluctuations in vulcanized viscosity, and a shrinkage rate of less than 0.5%; and it has a stable internal structure and can function reliably for a long time.

[0006] Preferably, in the polysiloxane base polymer containing vinyl groups and phenyl groups, the vinyl content is 0.8 to 1.2 parts by weight of the base polymer, and the phenyl content is 12 to 16 parts by weight of the base polymer.

[0007] Preferably, the composite crosslinking agent is composed of hydrogen-containing silicone oil and multifunctional silane crosslinking agent, the weight ratio of hydrogen-containing silicone oil to multifunctional silane crosslinking agent is 3:1-5:1, and the hydrogen content of the hydrogen-containing silicone oil is 0.8 parts to 1.2 parts of its own weight.

[0008] Preferably, the multifunctional silane crosslinking agent molecule contains three hydrolyzable alkoxy groups and one epoxy group.

[0009] Preferably, in the organotin-amine composite curing accelerator, the organotin is dibutyltin dilaurate, and the amine compound is 3-aminopropyltriethoxysilane, and the weight ratio of the two is 1:1.5-1:2.5.

[0010] Preferably, the surface modified composite filler is composed of nano-silica and graphene, the weight ratio of nano-silica to graphene is 12:1-18:1, and is modified with γ-methacryloxypropyltrimethoxysilane, and the specific surface area of ​​nano-silica is 200-300m 2 / g, and the thickness of graphene sheets is less than 10nm.

[0011] Preferably, the montmorillonite intercalation body is organic intercalation modified, with an interlayer spacing of 2-5 nm and a particle size of 50-100 nm.

[0012] Preferably, the dynamic imine bond cross-linking agent contains a Si-OC bond and an imine bond in its molecular structure, and has a molecular weight of 500-1000 Da.

[0013] Preferably, the silane coupling agent is γ-glycidyloxypropyltrimethoxysilane with a purity of ≥98%.

[0014] 10. A production process for a one-component organosilicon rubber, comprising the following steps: S1, adding a polysiloxane base polymer containing vinyl and phenyl groups to a high-speed stirring device, stirring at a speed of 1500-1800 r / min, and simultaneously adding a composite crosslinking agent and an organotin-amine composite curing accelerator, and stirring for 15-20 minutes; S2. Add the surface-modified composite filler, antioxidant, UV absorber, montmorillonite intercalant, dynamic imine bond crosslinker and silane coupling agent in sequence, and continue stirring for 20-25 minutes; S3. Transfer the mixture to an ultrasonic dispersion device and ultrasonically disperse it at a power of 400-500 W and a frequency of 60 kHz for 30-40 minutes; S4. Finally, vulcanization molding is performed in a flat vulcanizer at a vulcanization temperature of 110-130° C., a vulcanization pressure of 15-20 MPa, and a vulcanization time of 25-35 minutes to obtain the one-component silicone rubber.

[0015] The present invention provides a single-component silicone rubber and a production process thereof. It has the following beneficial effects: 1. In the present invention, a double cross-linked network and a ternary composite filler system are constructed by using a single-component silicone rubber with the help of the synergistic effect of multiple components, thereby achieving enhanced mechanical properties, improved aging resistance, enhanced oxygen barrier properties, improved self-repair functions and optimized processing performance, thereby solving the problem of incomplete curing and short service life of traditional products caused by a single cross-linking system.

[0016] 2. In the present invention, by forming a composite crosslinking agent from hydrogen-containing silicone oil and a multifunctional silane crosslinking agent under specific conditions, multiple performance optimizations such as increased crosslinking density, reduced thermal weight loss rate, and reduced compression permanent deformation are achieved, effectively improving the thermal stability, mechanical properties, and environmental aging resistance of the rubber, and solving the problems of sparse crosslinking network and uneven distribution of crosslinking points that are prone to stress concentration cracking when crosslinking with a single hydrogen-containing silicone oil.

[0017] 3. The present invention reduces the activation energy of the cross-linking reaction through synergistic effects, shortening the curing time to 25-35 hours, achieving a cross-linking conversion rate of 95% or higher, and forming a uniform cross-linked network. This increases the rubber's tensile strength to 6-8 MPa, elongation at break to 300%-350%, and maintains a strength retention rate of 85% or higher after wet heat aging, effectively enhancing the rubber's structural integrity after curing and its stability in complex environments. This solves the problem of the limited promoting effect of a single organotin accelerator on a multifunctional silane cross-linker, which results in a long curing time.

[0018] 4. In the present invention, the intercalation of montmorillonite is modified by organic intercalation, with an interlayer spacing of 2-5nm and a particle size of 50-100nm, which can reduce the water vapor transmission rate of rubber to 0.5g / (m 2 d) below, oxygen permeability 40%-50%, improved water resistance and aging resistance, tensile strength increased by 15%-20% to about 6-8MPa, 100% elongation stress increased by 10%-15%, thermal weight loss rate decreased by 10%-15%, thermal expansion coefficient decreased to (1.0-1.2)×10 -4 / ℃, enhancing load-bearing capacity and thermal stability, and improving the overall performance of rubber. This solves the problem that ordinary montmorillonite has poor compatibility with the rubber matrix and is prone to agglomeration, making it unable to effectively play a barrier and reinforcement role. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a production process flow chart of the single-component silicone rubber proposed in the present invention. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0021] Please see the attached Figure 1 The embodiment of the present invention provides a single-component silicone rubber, which includes the following components, by weight: 60-80 parts of a polysiloxane base polymer containing vinyl and phenyl groups, 5-10 parts of a composite crosslinking agent, 0.5-2 parts of an organic tin-amine composite curing accelerator, 10-15 parts of a surface-modified composite filler, 1-3 parts of an antioxidant, 0.5-2 parts of an ultraviolet absorber, 2-5 parts of a montmorillonite intercalant, 1-3 parts of a dynamic imine bond crosslinking agent, and 0.5-1.5 parts of a silane coupling agent.

[0022] Specifically, by adding 60-80 parts of a polysiloxane base polymer containing vinyl and phenyl groups, a polymer matrix with a specific molecular structure is obtained, achieving the goal of providing basic mechanical properties and crosslinking reaction sites for the single-component silicone rubber. The vinyl groups participate in the crosslinking reaction to form a network structure, while the phenyl groups enhance the interaction between molecular chains, improving heat resistance and weather resistance.

[0023] By adding 5-10 parts of a composite crosslinker, a crosslinking system consisting of hydrogenated silicone oil and a multifunctional silane crosslinker is formed. This creates an addition reaction with the vinyl groups in the base polymer, forming a three-dimensional crosslinked network and thereby improving the rubber's curing stability and structural strength. The hydrogenated silicone oil provides the hydrogen atoms required for crosslinking, while the multifunctional silane crosslinker enhances the complexity of the crosslinked network through its hydrolyzable alkoxy groups and reactive groups.

[0024] By adding 0.5 to 2 parts of an organotin-amine composite curing accelerator, a catalytic system consisting of dibutyltin dilaurate and 3-aminopropyltriethoxysilane is created. This catalyzes the crosslinking reaction, shortens the curing time, improves the curing efficiency, and ensures the crosslinking reaction proceeds fully. The organotin catalyzes the reaction between the hydrogenated silicone oil and the vinyl group, while the amine compound promotes the hydrolysis and crosslinking of the multifunctional silane crosslinker.

[0025] By adding 10-15 parts of a surface-modified composite filler, a reinforcement system consisting of nanosilica and graphene modified with a silane coupling agent is obtained. This system is evenly dispersed in the rubber matrix, improving mechanical properties such as tensile strength and tear strength, while also enhancing thermal conductivity and wear resistance. The nanosilica provides point reinforcement, while the graphene provides surface reinforcement. The modification improves compatibility with the matrix.

[0026] By adding 1-3 parts of antioxidant, a stable system is obtained that can inhibit the oxidation degradation of rubber, thereby capturing free radicals, delaying the performance degradation of rubber due to oxidation during processing and use, and extending the service life.

[0027] By adding 0.5 to 2 parts of ultraviolet absorber, a protective system that can absorb ultraviolet energy is obtained, thereby converting ultraviolet radiation energy into heat energy or other harmless forms of energy, preventing ultraviolet rays from causing the breakage of rubber molecular chains and improving weather resistance.

[0028] By adding 2-5 parts of montmorillonite intercalants, a layered filler system modified by organic intercalation is obtained, which is evenly exfoliated and dispersed in the rubber matrix to form a nano-barrier structure, blocking the penetration of small molecules, and at the same time synergistically enhancing the mechanical properties and heat resistance of the rubber with graphene.

[0029] By adding 1-3 parts of dynamic imine bond crosslinker, a crosslinking system containing dynamic covalent bonds is obtained, which enables the reversible breakage and recombination of the imine bonds when the rubber is subjected to external force or environmental stimulation, giving the rubber self-repairing function and improving the structural stability at high temperatures.

[0030] By adding 0.5-1.5 parts of silane coupling agent, a medium system is obtained that can improve the interface bonding between the filler and the matrix, so that the two ends of the molecule are chemically bonded to the filler surface and the polymer molecules respectively, thereby enhancing the interface bonding strength, avoiding filler agglomeration, and improving the overall performance of the rubber.

[0031] Through the synergistic effect of multiple components, including a vinyl- and phenyl-containing polysiloxane base polymer and a composite crosslinker, a dual-crosslinked network and ternary composite filler system are constructed, achieving enhanced mechanical properties such as a tensile strength of 6-8 MPa and an elongation at break of ≥300%. Antioxidants and UV absorbers extend the oxidation induction time at 200°C to over 80 minutes, and the tensile strength retention rate after 1000 hours of xenon lamp aging is ≥80%. A nano-barrier formed by montmorillonite intercalates and graphene reduces oxygen transmission rate by 40-50%. A dynamic imine bond crosslinker achieves a crack repair efficiency of ≥80% and a strength recovery rate of ≥75% after self-healing. Furthermore, treatment with a silane coupling agent increases filler dispersion to over 90% and shortens the vulcanization time to 25-35 minutes. This effectively addresses the issue of incomplete curing and short service life associated with the single crosslinking system of traditional one-component silicone rubber, significantly improving the material's applicability and durability in harsh environments.

[0032] In the polysiloxane base polymer containing vinyl and phenyl groups, the vinyl content is 0.8 to 1.2 parts by weight of the base polymer, and the phenyl content is 12 to 16 parts by weight of the base polymer.

[0033] Specifically, vinyl (-CH=CH2) serves as the active site for cross-linking reaction, and in the presence of platinum catalyst (such as chloroplatinic acid-tetramethyldivinyldisiloxane complex, the active center Pt 2+ In the presence of a silane (concentration controlled at 5-10ppm), a hydrosilylation reaction occurs with the Si-H bonds of the hydrogenated silicone oil in the composite crosslinker. The reaction follows Markovnikov's rule: after the vinyl double bond opens, hydrogen atoms add to the carbon atoms containing more hydrogen, forming stable Si-C crosslinking points. The activation energy of this reaction is approximately 40-60kJ / mol, and at a curing temperature of 110-130°C, the reaction rate constant can reach 0.01-0.05min. -1 When the molar ratio of vinyl to Si-H bonds is controlled between 1:1.2 and 1:1.5, the crosslinking reaction conversion rate can reach over 95%, forming a three-dimensional network skeleton with uniform density. When the vinyl content is less than 0.8 parts, the number of crosslinking points is insufficient. When it is higher than 1.2 parts, it is easy to cause excessive crosslinking between molecular chains, resulting in a sudden increase in rubber hardness and a decrease in elasticity.

[0034] Phenyl groups (-C6H5) are attached to the polysiloxane backbone via silicon-carbon (Si-C) bonds. The large π-conjugated structure of the benzene ring provides strong electron delocalization. Phenyl groups in adjacent molecular chains form secondary bonds through π-π stacking (with an interaction energy of approximately 8-12 kJ / mol), enhancing interchain interactions. The steric hindrance of the phenyl group (the benzene ring diameter is approximately 0.5 nm) inhibits rotation of the silicon-oxygen (Si-O) bonds in the polysiloxane backbone, enhancing molecular chain rigidity. When the phenyl content is 12-16 parts, the molar fraction of the benzene ring in the polysiloxane chain is about 5%-8%. At this time, the total van der Waals force between the molecular chains increases by 20%-30%, and the glass transition temperature (Tg) is raised from -60°C to around -50°C. At the same time, the non-polar structure of the phenyl group forms a hydrophobic interaction with the organic modified layer on the surface of fillers such as nanosilica and graphene, reducing the filler-matrix interface energy (interfacial tension from 50-60mN / m to 30-40mN / m) and promoting uniform dispersion of the filler. When the phenyl content is less than 12 parts, the intermolecular chain force is insufficient. When it is higher than 16 parts, the flexibility of the polysiloxane main chain is destroyed, resulting in a decrease in the low-temperature elasticity of the rubber (elongation at break at -40°C ≤150%).

[0035] By controlling the vinyl content to 0.8-1.2 parts by weight of the base polymer, a crosslinking density of 0.06-0.08 mol / m 3 The tensile strength of the vulcanized rubber is 6-8MPa, the elongation at break is 300%-350%, and the cross-linking network uniformity coefficient is ≤0.15. When the phenyl content is 12-16 parts, the heat deformation temperature of the rubber is increased to 180-200℃, the thermal weight loss rate at 200℃ is ≤10%, and the thermal expansion coefficient is reduced to (1.0-1.2)×10 -4 / °C, and the filler dispersion is increased from 70% to 85%, effectively enhancing the interaction between molecular chains and filler compatibility, improving the mechanical properties, heat stability, and structural uniformity of the cured rubber. This solves the problems of traditional polysiloxane base polymers, such as low crosslink density due to insufficient vinyl content, and structural relaxation at high temperatures caused by weak inter-molecular forces when there is no phenyl group or the phenyl group content is too low.

[0036] The composite crosslinking agent consists of hydrogen-containing silicone oil and multifunctional silane crosslinking agent, the weight ratio of hydrogen-containing silicone oil to multifunctional silane crosslinking agent is 3:1-5:1, and the hydrogen content of hydrogen-containing silicone oil is 0.8-1.2 parts of its own weight.

[0037] Specifically, the Si-H bond in the hydrogenated silicone oil is catalyzed by a platinum catalyst (catalytic efficiency is 10 -6 -10 -4 molPt / g system), undergoes a hydrosilylation reaction with the vinyl groups in the base polymer to generate Si-C crosslinking points. The activation energy of the reaction is about 40-60 kJ / mol, and the reaction rate constant is 0.01-0.05 min at 110-130 °C. -1 . When the hydrogen content is controlled at 0.8-1.2 parts, the molar ratio of Si-H bonds to vinyl groups is 1.2-1.5:1, ensuring sufficient cross-linking reaction and avoiding residual Si-H bonds that trigger side reactions (such as Si-H bonds reacting with water vapor in the air at high temperatures to generate hydrogen, causing bubbling of the adhesive layer). The multifunctional silane cross-linker molecule contains three hydrolyzable alkoxy groups (such as methoxy) and one epoxy group. The alkoxy group undergoes hydrolysis reaction in a humid environment to generate silanol groups (-SiOH). The silanol groups condense with each other or with the hydroxyl groups at the end of the polysiloxane chain to form Si-O-Si bonds, constructing a chemical cross-linking network; the epoxy group opens the ring under the action of the amine curing accelerator and reacts with the polysiloxane chain segments or the surface active groups of the filler to form a covalent bond connection. When the weight ratio of hydrogenated silicone oil to multifunctional silane crosslinker is 3:1-5:1, the crosslinking reaction of the two acts synergistically: the hydrogenated silicone oil provides the main crosslinking density (accounting for 60%-70% of the total crosslinking points), and the multifunctional silane crosslinker fills the gaps in the crosslinked network through hydrolysis condensation and epoxy ring-opening reaction, forming a "main chain crosslinking-interface bridging" dual network structure, and the standard deviation of the crosslinking point distribution is ≤0.12.

[0038] The cross-linking density reaches 0.06-0.08 mol / m by forming a composite cross-linking agent with hydrogenated silicone oil and multifunctional silane cross-linking agent in a specific weight ratio and within the hydrogen content range of hydrogenated silicone oil. 3The vulcanized rubber has a thermal weight loss rate of ≤10% at 200°C, a compression set (150°C x 72h) of ≤20%, a tensile strength of 6-8MPa, an elongation at break of 300%-350%, and a strength retention rate of ≥85% after wet heat aging. It maintains elasticity within the temperature range of -40°C to 200°C, and the storage modulus fluctuation amplitude in dynamic thermomechanical analysis is ≤15%, effectively improving the rubber's thermal stability, mechanical properties, and environmental aging resistance. This solves the problem of sparse crosslinking networks and uneven crosslinking point distribution when crosslinking with a single hydrogen-containing silicone oil, which can easily lead to stress concentration cracking.

[0039] The multifunctional silane crosslinker molecule contains three hydrolyzable alkoxy groups and one epoxy group.

[0040] Specifically, the three hydrolyzable alkoxy groups (common ones such as methoxy and ethoxy) in the multifunctional silane crosslinker will undergo a hydrolysis reaction in the presence of trace amounts of water. Taking the methoxy group (-OCH3) as an example, the hydrolysis process is that the methoxy group undergoes a nucleophilic substitution reaction with the hydroxyl group (-OH) in the water molecule to generate silanol (-SiOH) and methanol (CH3OH). This hydrolysis reaction is carried out gradually. As the reaction time passes, the three alkoxy groups on the silicon atom will gradually be converted into silanols. The generated silanols have high reactivity and will undergo a condensation reaction, that is, the silanols remove a molecule of water from each other to form a Si-O-Si bond, thereby building part of the crosslinked network. At the same time, the silanol can also undergo a condensation reaction with the hydroxyl group at the end of the polysiloxane chain, further connecting the multifunctional silane crosslinker with the polysiloxane base polymer, so that the crosslinked network is continuously expanded and improved.

[0041] In the presence of amine curing accelerators, the nitrogen atom on the amine group (-NH2) in the epoxy group in the molecule will undergo a nucleophilic attack on the epoxy group, triggering a ring-opening reaction. After the epoxy group ring opens, it will undergo a chemical bonding reaction with the active sites on the polysiloxane chain (such as hydroxyl and amino groups) or the active groups on the modified filler surface (such as silanol groups), forming covalent bonds. This further strengthens the cross-linked network structure, allowing it to establish closer connections between different dimensions and different components, and enhancing the cohesion of the entire system.

[0042] A complex and dense cross-linked network is constructed through hydrolysis, condensation and epoxy ring opening reactions, so that the cross-linking point density reaches 0.06-0.08 mol / m 3The tensile strength is increased to 6-8MPa, the elongation at break reaches 300%-350%, the strength retention rate after wet heat aging is 85% or above, the weight loss rate at 200°C is controlled within 10%, and good elasticity is maintained from -40°C to 200°C. The fluctuation range of the storage modulus is within 15%, effectively improving the structural integrity and stability of the rubber material. This solves the problem of traditional cross-linking agents constructing a single cross-linked network structure and insufficient cross-linking point density.

[0043] In the organic tin-amine composite curing accelerator, the organic tin is dibutyltin dilaurate and the amine compound is 3-aminopropyltriethoxysilane, and the weight ratio of the two is 1:1.5-1:2.5.

[0044] Specifically, dibutyltin dilaurate is an organic tin compound whose central tin atom (Sn) has an empty valence orbital and can form a coordination complex with the hydrogen atom of the Si-H bond in the hydrogen-containing silicone oil. This coordination effect changes the electron cloud density of the Si-H bond and reduces the dissociation energy of the Si-H bond. The activation energy required for the breaking of the Si-H bond is relatively high (about 80-100kJ / mol). Under the catalysis of dibutyltin dilaurate, the activation energy can be reduced to 40-60kJ / mol, thereby significantly accelerating the rate of the Si-H bond and the vinyl group in the base polymer to undergo hydrosilylation reaction. Under the conditions of vulcanization temperature (110-130°C), the reaction rate constant is less than 0.005min when there is no catalysis. -1 Increased to 0.01-0.05min -1 , which effectively promotes the cross-linking reaction and enables the cross-linking network to be formed faster.

[0045] As an amine compound, the amino group (-NH2) in 3-aminopropyltriethoxysilane has strong nucleophilicity. For the epoxy group in the multifunctional silane crosslinker, the amino group will carry out a nucleophilic attack on it, triggering the epoxy ring-opening reaction. At the same time, the ethoxy group (-OC2H5) in its molecule will undergo a hydrolysis reaction to generate silanol (-SiOH) in the presence of trace moisture. The silanol groups can condense with each other to form Si-O-Si bonds, or condense with the hydroxyl groups at the end of the polysiloxane chain, thereby participating in the construction of the cross-linked network. In addition, when 3-aminopropyltriethoxysilane and dibutyltin dilaurate are combined in a weight ratio of 1:1.5-1:2.5, a synergistic effect exists between the two. Amine compounds can stabilize the active state of organotin compounds in the system, preventing them from agglomerating and inactivating due to excessive local concentrations. While organotin compounds catalyze the cross-linking of hydrogenated silicone oils, they also make the system environment more conducive to the amine compounds promoting the ring-opening of epoxy groups and the hydrolysis of ethoxy groups, thereby ensuring that the entire cross-linking reaction proceeds efficiently and orderly.

[0046] Through synergistic effects, the activation energy of the cross-linking reaction is reduced, shortening the curing time to 25-35 hours, achieving a cross-linking conversion rate of 95% or higher, and forming a uniform cross-linked network. This increases the rubber's tensile strength to 6-8 MPa, elongation at break to 300%-350%, and maintains a strength retention rate of 85% or higher after wet heat aging, effectively enhancing the rubber's structural integrity after curing and its stability in complex environments. This solves the problem of the limited promoting effect of a single organotin accelerator on multifunctional silane cross-linkers and the long curing time.

[0047] The surface modified composite filler is composed of nano-silica and graphene, with a weight ratio of nano-silica to graphene of 12:1-18:1. It is modified with γ-methacryloxypropyltrimethoxysilane, and the specific surface area of ​​nano-silica is 200-300m 2 / g, and the thickness of graphene sheets is less than 10nm.

[0048] Specifically, nano-silicon dioxide has a high specific surface area (200-300m 2 / g), and there are a large number of silanol groups (-SiOH) on its surface. During the modification process of γ-methacryloxypropyltrimethoxysilane, the trimethoxy group (-OCH3) in the silane coupling agent will first undergo a hydrolysis reaction in the presence of trace amounts of water to generate silanol groups (-SiOH). These newly generated silanol groups undergo a condensation reaction with the original silanol groups on the surface of nano-silica to form a stable Si-O-Si bond, thereby grafting γ-methacryloxypropyltrimethoxysilane onto the surface of nano-silica. After grafting, the γ-methacryloxy group (-CH2=CH-COO-) on the surface of nano-silica has high reactivity and can react chemically with the active groups (such as hydroxyl groups, vinyl groups, etc.) in the polysiloxane base polymer to form a chemical bond connection, so that the nano-silica can be firmly embedded in the rubber matrix. At the same time, nano-silica, with its high specific surface area and nanoscale effect, plays the role of physical filling and physical cross-linking points in the rubber matrix, which can effectively hinder the movement of molecular chains and improve the modulus and hardness of the rubber. And when combined with graphene at a weight ratio of 12:1-18:1, nano-silica can be filled between and around the graphene sheets to form a denser filler network structure.

[0049] The thickness of graphene sheets is less than 10nm, and they have excellent mechanical properties and a two-dimensional planar structure. In the composite filler system, the graphene sheets interact with each other through π-π stacking to form continuous conductive and thermal conductive channels, which helps to improve the thermal and electrical conductivity of the rubber material. Its surface can also be modified by γ-methacryloxypropyltrimethoxysilane. The silane coupling agent chemically bonds with the active sites on the graphene surface (such as carboxyl and hydroxyl groups on the edge), thereby improving the compatibility between graphene and the polysiloxane matrix and nano-silica, avoiding agglomeration, and more evenly dispersing it in the rubber matrix. When working synergistically with nano-silica, the two-dimensional planar structure of graphene can provide attachment sites for nano-silica. The two are intertwined to jointly build a three-dimensional filler reinforcement network, which can more effectively transfer stress when subjected to external forces and improve the overall load-bearing capacity of the rubber material.

[0050] Through their respective functions and synergistic cooperation, the rubber tensile strength is increased by 25%-30% to 6-8MPa, the tear strength is increased to 20-25kN / m, the modulus is increased by 30%-40%, the hardness is increased by 5-8 degrees, the thermal conductivity is increased to 0.3-0.4W / (m·K), antistatic properties are enhanced, wear resistance is enhanced, the wear rate is reduced by 40%-50%, and the thermal expansion coefficient is reduced to (1.0-1.2)×10 -4 / ℃, improving rubber performance in many aspects. It solves the problem of easy agglomeration and uneven dispersion of fillers affecting performance and stability when using nano-silica alone.

[0051] The montmorillonite intercalation body is organic intercalation modified, with an interlayer spacing of 2-5nm and a particle size of 50-100nm.

[0052] Specifically, montmorillonite itself is a silicate mineral with a layered structure, with exchangeable cations (such as sodium ions) between its layers. When performing organic intercalation modification, long-chain organic cationic surfactants (such as octadecyltrimethylammonium chloride) are usually selected. The positively charged end of these organic cationic surfactants will undergo ion exchange reactions with the exchangeable cations between the montmorillonite layers, replacing the original inorganic cations, while the long-chain alkyl part of the organic cation will be inserted into the interlayer of the montmorillonite. As the organic cations continue to be inserted, the interlayer spacing of the montmorillonite gradually increases, eventually reaching a range of 2-5nm. At the same time, during the intercalation modification process, appropriate physical means such as stirring and ultrasound are used to assist, ensuring that the organic cations can evenly enter the interlayer and disperse the montmorillonite particles to form a particle state with a particle size of 50-100nm. On the one hand, montmorillonite intercalants in this particle size range have a larger specific surface area and can better interact with the rubber matrix and other fillers; on the other hand, the appropriate particle size helps them to be evenly dispersed in the rubber matrix, avoiding agglomeration due to excessively large particles or difficulty in playing an effective barrier role due to excessively small particles.

[0053] When this organically intercalated modified montmorillonite intercalant is added to a one-component silicone rubber system, its compatibility with the rubber matrix is ​​significantly improved due to the increased interlayer spacing and the presence of surface organic groups. During rubber mixing and other processing processes, under the action of shear force, the montmorillonite intercalant can be more evenly dispersed in the rubber matrix, and its layered structure can be oriented along the direction of the rubber molecular chain. The layered structure of montmorillonite is like a tiny "barrier" that can effectively block the penetration of small molecules such as water vapor and oxygen from the outside into the rubber. For example, when oxygen molecules want to pass through the layers of montmorillonite to enter the rubber, they need to travel along a tortuous path between the layers, which greatly increases the difficulty of penetration and thus reduces the oxygen permeability. At the same time, there is a certain interaction between the montmorillonite intercalation body and the rubber matrix. The organic groups on its surface can be connected with the rubber molecular chain through physical adsorption or chemical bonding (such as hydrogen bonding), further enhancing the overall structural stability of the rubber. When subjected to external force, the montmorillonite intercalation body can share part of the stress, play a reinforcing role, and inhibit the expansion of microcracks in the rubber matrix.

[0054] The montmorillonite intercalation body is modified by organic intercalation, with an interlayer spacing of 2-5nm and a particle size of 50-100nm, which can reduce the water vapor transmission rate of rubber to 0.5g / (m 2d) below, oxygen permeability 40%-50%, improved water resistance and aging resistance, tensile strength increased by 15%-20% to about 6-8MPa, 100% elongation stress increased by 10%-15%, thermal weight loss rate decreased by 10%-15%, thermal expansion coefficient decreased to (1.0-1.2)×10 -4 / ℃, enhancing load-bearing capacity and thermal stability, and improving the overall performance of rubber. This solves the problem that ordinary montmorillonite has poor compatibility with the rubber matrix and is prone to agglomeration, making it unable to effectively play a barrier and reinforcement role.

[0055] The dynamic imine bond crosslinker contains Si-OC bond and imine bond in its molecular structure, with a molecular weight of 500-1000Da.

[0056] Specifically, in a one-component silicone rubber system, the Si-OC bond contained in the dynamic imine bond crosslinker has a high reactivity. The silicon atom (Si) at one end can undergo a condensation reaction with the silanol (-SiOH) or other silicon-containing active sites in the polysiloxane base polymer, and by removing small molecules (such as alcohols), a stable Si-O-Si bond is formed, thereby connecting the crosslinker molecule to the molecular chain network of the rubber and becoming part of the crosslinked network. This chemical bonding method establishes a strong connection between the crosslinker and the rubber matrix, laying the foundation for the subsequent crosslinking effect and the improvement of overall performance. At the same time, the presence of the Si-OC bond regulates the solubility and dispersibility of the crosslinker molecules in the rubber matrix to a certain extent. Because it has a certain degree of flexibility, it helps the crosslinker molecules to be better distributed evenly in the matrix, avoiding local agglomeration and ensuring that the crosslinking reaction can proceed more evenly throughout the system.

[0057] The imine bond (-C=N-) is a key structural unit for achieving dynamic crosslinking in a crosslinking system. At room temperature and under normal use, the imine bond can maintain a relatively stable covalent bond state, and together with other crosslinking points (such as the connection points formed with the rubber matrix through Si-OC bonds, etc.), it constructs a three-dimensional crosslinked network structure, which gives the rubber good mechanical properties and can withstand certain external forces without excessive deformation. However, when the rubber is subjected to external thermal stimulation (such as temperature rising to a certain level) or mechanical stress (such as tension, extrusion, etc., which causes local stress concentration), the imine bond will undergo a reversible fracture reaction. The fracture energy of the imine bond is approximately 80-100 kJ / mol. When the corresponding external stimulus energy reaches this threshold, its chemical bond breaks, the originally relatively fixed crosslinked network structure is destroyed, and the molecular chain segments can slide and rearrange relative to each other to a certain extent, releasing the accumulated stress. When the external stimulus disappears, the imine bond can undergo cross-linking reaction again under appropriate conditions (such as the temperature returns to normal, the molecular chain segments come closer after stress is released, etc.), and re-form stable covalent bonds, so that the cross-linked network structure can be repaired and restored to its integrity, and the overall performance of the rubber will also be restored to a certain level.

[0058] By combining Si-OC bonds with the rubber matrix and achieving dynamic reversible crosslinking through imine bonds, the rubber acquires excellent self-repair capabilities, achieving a microcrack repair efficiency of 80% or more, a tensile strength recovery rate of 75% or more, and a storage modulus drop of less than 15% at high temperatures (180°C). Conventional mechanical properties are stable, with a tensile strength of 6-8 MPa and an elongation at break of 300%-350%, extending service life and improving performance stability. This solves the problem of traditional cross-linked rubber being unable to self-repair after external damage, and the accumulation of damage leading to premature scrapping.

[0059] The silane coupling agent is γ-glycidyloxypropyltrimethoxysilane with a purity of ≥98%.

[0060] Specifically, the γ-glycidyloxypropyltrimethoxysilane molecule contains three methoxy groups (-OCH3). When exposed to trace amounts of water (which can be water vapor in the environment or a small amount of water contained in the rubber system), the methoxy groups will undergo a hydrolysis reaction. Specifically, the hydroxyl groups (-OH) in the water molecules will undergo nucleophilic substitution of the methoxy groups, causing the methoxy groups to gradually convert into silanol groups (-SiOH), while generating corresponding alcohol byproducts (such as methanol). This hydrolysis process is carried out step by step. First, one methoxy group is hydrolyzed. As time goes by and with the continued action of water, the remaining methoxy groups will also be hydrolyzed, eventually generating three silanol groups. The rate of the hydrolysis reaction is affected by factors such as temperature, moisture content, and the pH of the system. Under suitable conditions (for example, a temperature of 25°C-50°C and a weakly acidic or neutral system), it can proceed more fully and stably, ensuring that the number of silanol groups required for subsequent reactions is sufficient.

[0061] Fillers such as nano-silica, graphene, and montmorillonite typically have a large number of active hydroxyl groups (-OH) on their surfaces. The silanol groups (-SiOH) generated by the hydrolysis of silane coupling agents can undergo a condensation reaction with the hydroxyl groups on the surfaces of these fillers. By removing a molecule of water, a stable Si-O-Si bond is formed, thereby chemically bonding the silane coupling agent molecules to the filler surface. Taking nano-silica as an example, it has a large specific surface area and abundant surface silanol groups, which provide numerous reaction sites with silane coupling agents and enable relatively dense coupling agent grafting. This is equivalent to giving the filler an "organic coat," changing the filler's original surface properties from hydrophilic to somewhat hydrophobic. It also increases the variety of active functional groups on the filler surface, improving its compatibility with the rubber matrix.

[0062] The γ-glycidyloxypropyl group (-OCH2CH(OH)CH2O(CH2)3Si-) at the other end of the coupling agent molecule is highly reactive and can chemically react with active sites (such as hydroxyl and vinyl groups) in the polysiloxane base polymer. For example, its epoxy group (-CH(OH)CH2O-) can undergo a ring-opening reaction under the influence of amine compounds, then form covalent bonds with groups such as hydroxyl groups on the polysiloxane molecular chain. Alternatively, ether bonds and other components within its structure can also undergo a certain degree of physical adsorption with the polymer molecular chain. Through these chemical bonding and physical adsorption effects, the silane coupling agent builds a "chemical bridge" between the filler and the rubber matrix, tightly connecting the filler and the matrix and strengthening the interfacial bonding between the two.

[0063] The requirement of ≥98% purity is key to ensuring the effective function of silane coupling agents. High purity means minimal impurities, which prevent interference with processes such as hydrolysis and reactions with fillers and substrates. For example, the presence of high levels of metal ions can catalyze premature polymerization of the silane coupling agent, preventing it from fully reacting with the filler and substrate. Alternatively, other small organic molecules in the impurities may occupy reactive sites on the filler surface, hindering the grafting of the silane coupling agent, thereby affecting the overall filler-coupling agent-substrate interaction and reducing interfacial bonding strength. High-purity silane coupling agents, however, can stably and efficiently participate in all steps of the reaction according to the intended chemical mechanism, ensuring the proper functioning of their properties.

[0064] Through mechanisms such as hydrolysis and reaction with fillers and the rubber matrix, the filler dispersion in the rubber matrix is ​​increased to 90% or above, resulting in a 30%-40% increase in interfacial shear strength and a 10%-15% increase in tensile strength to 6-8 MPa. Elongation at break is maintained at 300%-350%, and strength retention after wet-heat aging is increased from approximately 70% to 85% or above, enhancing mechanical properties and structural stability. This solves the problem of poor compatibility between fillers and the rubber matrix and performance degradation due to weak interfacial bonding over long-term use.

[0065] The production process of one-component silicone rubber, for one-component silicone rubber, comprises the following steps: S1. Add a polysiloxane base polymer containing vinyl and phenyl groups to a high-speed stirring device and stir at a speed of 1500-1800 r / min. Simultaneously, add a composite crosslinking agent and an organotin-amine composite curing accelerator and stir for 15-20 minutes. S2. Add the surface-modified composite filler, antioxidant, UV absorber, montmorillonite intercalant, dynamic imine bond crosslinker and silane coupling agent in sequence, and continue stirring for 20-25 minutes; S3. Transfer the mixture to an ultrasonic dispersion device and ultrasonically disperse it at a power of 400-500 W and a frequency of 60 kHz for 30-40 minutes; S4. Finally, vulcanization molding is carried out in a flat vulcanizer at a vulcanization temperature of 110-130° C., a vulcanization pressure of 15-20 MPa, and a vulcanization time of 25-35 minutes to obtain a single-component silicone rubber.

[0066] Specifically, a polysiloxane base polymer containing vinyl and phenyl groups is stirred at 1500-1800 r / min to stretch the molecular chains and facilitate the dispersion of subsequent components. A composite crosslinker and an organotin-amine composite curing accelerator are added. The accelerators reduce the activation energy and accelerate the hydrosilylation reaction between the Si-H bonds of the hydrogenated silicone oil and the vinyl groups of the base polymer. The synergistic effect of these two agents promotes the initial initiation of the crosslinking reaction. Stirring is then continued for 15-20 minutes to allow the components to fully mix and contact, laying the foundation for the construction of a uniform crosslinked network.

[0067] Add the various components sequentially and stir for 20-25 minutes. The modified composite filler is connected to the matrix via a coupling agent, providing reinforcement. The antioxidant captures free radicals, and the UV absorber absorbs UV energy, delaying aging. The montmorillonite intercalation blocks penetration and enhances stability. The dynamic imine crosslinker imparts self-healing properties. Stirring ensures that all components are evenly dispersed in the system, synergistically improving the internal structure.

[0068] Transfer the mixture to an ultrasonic dispersion device and disperse it for 30-40 minutes at a power of 400-500W and a frequency of 60kHz. Ultrasonic dispersion utilizes the cavitation, mechanical, and thermal effects generated by ultrasound propagating through a medium to further process the mixture.

[0069] Finally, the vulcanization process takes place in a flat-bed vulcanizer at a temperature of 110-130°C. This temperature range is based on the optimal crosslinking reaction between the hydrogenated silicone oil in the composite crosslinker and the vinyl groups of the polysiloxane base polymer, as well as the hydrolysis and condensation of the multifunctional silane crosslinker and the epoxy ring-opening. At this temperature, the rates of the various crosslinking reactions reach a relatively balanced and efficient state, allowing the crosslinked network to be fully established, forming a stable three-dimensional structure.

[0070] Products made through the single-component silicone rubber production process boast a tensile strength of 6-8 MPa, an elongation at break of 300%-350%, a tear strength of 20-25 kN / m, and excellent mechanical properties. The oxidation induction time at 200°C exceeds 80 minutes, and after 1000 hours of xenon lamp aging, the product exhibits minimal color difference, a strength retention rate of ≥80%, excellent aging resistance, a self-healing efficiency of ≥80%, a strength recovery rate of ≥75%, a filler dispersion of over 90%, minimal fluctuation in vulcanized viscosity, and a shrinkage rate of ≤0.5%. These products exhibit excellent overall performance, facilitate processing, and offer stable quality and a long service life. This process addresses the issues of uneven dispersion of components in traditional processes, which can lead to large performance fluctuations and localized performance defects in finished products.

[0071] Example 1: The single-component silicone rubber comprises the following components, calculated by weight: 80 parts of a polysiloxane base polymer containing vinyl and phenyl groups, 10 parts of a composite crosslinking agent, 2 parts of an organic tin-amine composite curing accelerator, 15 parts of a surface-modified composite filler, 3 parts of an antioxidant, 2 parts of an ultraviolet absorber, 5 parts of a montmorillonite intercalant, 3 parts of a dynamic imine bond crosslinking agent, and 1.5 parts of a silane coupling agent.

[0072] In the polysiloxane base polymer containing vinyl groups and phenyl groups, the vinyl content is 1.2 parts by weight of the base polymer, and the phenyl content is 16 parts by weight of the base polymer.

[0073] The composite crosslinking agent consists of hydrogen-containing silicone oil and multifunctional silane crosslinking agent, the weight ratio of hydrogen-containing silicone oil to multifunctional silane crosslinking agent is 5:1, and the hydrogen content of hydrogen-containing silicone oil is 1.2 parts of its own weight.

[0074] The multifunctional silane crosslinker molecule contains three hydrolyzable alkoxy groups and one epoxy group.

[0075] In the organic tin-amine composite curing accelerator, the organic tin is dibutyltin dilaurate and the amine compound is 3-aminopropyltriethoxysilane, and the weight ratio of the two is 1:2.5.

[0076] The surface modified composite filler is composed of nano-silica and graphene, with a weight ratio of nano-silica to graphene of 18:1. It is modified with γ-methacryloxypropyltrimethoxysilane, and the specific surface area of ​​nano-silica is 300m 2 / g, and the thickness of graphene sheets is less than 10nm.

[0077] The montmorillonite intercalation body is organic intercalation modified, with an interlayer spacing of 5nm and a particle size of 100nm.

[0078] The dynamic imine bond crosslinker contains Si-OC bond and imine bond in its molecular structure, with a molecular weight of 1000Da.

[0079] The silane coupling agent is γ-glycidyloxypropyltrimethoxysilane with a purity of ≥98%.

[0080] A production process for a one-component organosilicon rubber, characterized in that it is used for the one-component organosilicon rubber according to any one of claims 1 to 9, comprising the following steps: S1. Add a polysiloxane base polymer containing vinyl and phenyl groups to a high-speed stirring device and stir at a speed of 1800 r / min. Simultaneously, add a composite crosslinking agent and an organotin-amine composite curing accelerator and stir for 20 minutes. S2, adding the surface modified composite filler, antioxidant, UV absorber, montmorillonite intercalant, dynamic imine bond crosslinker and silane coupling agent in sequence, and continuing stirring for 25 minutes; S3. Transfer the mixture to an ultrasonic dispersion device and ultrasonically disperse it for 40 minutes at a power of 500 W and a frequency of 60 kHz. S4. Finally, vulcanize and mold it in a flat vulcanizer at a vulcanization temperature of 130° C., a vulcanization pressure of 20 MPa, and a vulcanization time of 35 minutes to obtain a one-component silicone rubber.

[0081] Example 2: This embodiment differs from the above-mentioned embodiment 1 in that: The single-component silicone rubber comprises the following components, calculated by weight: 60 parts of a polysiloxane base polymer containing vinyl and phenyl groups, 5 parts of a composite crosslinking agent, 0.5 parts of an organic tin-amine composite curing accelerator, 10 parts of a surface-modified composite filler, 1 part of an antioxidant, 0.5 parts of an ultraviolet absorber, 2 parts of a montmorillonite intercalant, 1 part of a dynamic imine bond crosslinking agent, and 0.5 parts of a silane coupling agent.

[0082] Example 3: This embodiment differs from the above-mentioned embodiment 1 in that: The single-component silicone rubber comprises the following components, calculated by weight: 70 parts of a vinyl- and phenyl-containing polysiloxane base polymer, 7.5 parts of a composite crosslinking agent, 1.25 parts of an organic tin-amine composite curing accelerator, 12.5 parts of a surface-modified composite filler, 2 parts of an antioxidant, 1.25 parts of an ultraviolet absorber, 3.5 parts of a montmorillonite intercalant, 2 parts of a dynamic imine bond crosslinking agent, and 1 part of a silane coupling agent.

[0083] Table 1: The comparison in the above table is with existing materials. It can be seen from the above table that there are obvious differences in key performance indicators between the one-component silicone rubber of the present invention and existing products, and the amount of each component affects the performance change trend, thereby achieving the effects of improved curing stability, enhanced structural integrity and extended service life, and solving the problem of incomplete curing and short service life of traditional one-component silicone rubber due to the single cross-linking system.

[0084] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. One-component silicone rubber, characterized in that: The invention comprises the following components in parts by weight: 60-80 parts of a polysiloxane base polymer containing vinyl and phenyl groups, 5-10 parts of a composite crosslinking agent, 0.5-2 parts of an organic tin-amine composite curing accelerator, 10-15 parts of a surface-modified composite filler, 1-3 parts of an antioxidant, 0.5-2 parts of an ultraviolet absorber, 2-5 parts of a montmorillonite intercalant, 1-3 parts of a dynamic imine bond crosslinking agent, and 0.5-1.5 parts of a silane coupling agent.

2. The one-component silicone rubber according to claim 1, characterized in that: In the polysiloxane base polymer containing vinyl and phenyl groups, the vinyl content is 0.8 to 1.2 parts by weight of the base polymer, and the phenyl content is 12 to 16 parts by weight of the base polymer.

3. The one-component silicone rubber according to claim 1, characterized in that: The composite crosslinking agent is composed of hydrogen-containing silicone oil and multifunctional silane crosslinking agent, the weight ratio of hydrogen-containing silicone oil to multifunctional silane crosslinking agent is 3:1-5:1, and the hydrogen content of the hydrogen-containing silicone oil is 0.8 parts to 1.2 parts of its own weight.

4. The one-component silicone rubber according to claim 3, characterized in that: The multifunctional silane crosslinking agent molecule contains three hydrolyzable alkoxy groups and one epoxy group.

5. The one-component silicone rubber according to claim 1, characterized in that: In the organotin-amine composite curing accelerator, the organotin is dibutyltin dilaurate, and the amine compound is 3-aminopropyltriethoxysilane, and the weight ratio of the two is 1:1.5-1:2.

5.

6. The one-component silicone rubber according to claim 1, characterized in that: The surface-modified composite filler is composed of nano-silica and graphene, with a weight ratio of nano-silica to graphene of 12:1-18:

1. It is modified with γ-methacryloxypropyltrimethoxysilane, and the specific surface area of ​​the nano-silica is 200-300 m² / g, and the thickness of the graphene sheet is less than 10 nm.

7. The one-component silicone rubber according to claim 1, characterized in that: The montmorillonite intercalation body is organic intercalation modified, has an interlayer spacing of 2-5nm, and a particle size of 50-100nm.

8. The one-component silicone rubber according to claim 1, characterized in that: The dynamic imine bond cross-linking agent contains Si-OC bond and imine bond in its molecular structure, and has a molecular weight of 500-1000 Da.

9. The one-component silicone rubber according to claim 1, characterized in that: The silane coupling agent is γ-glycidyloxypropyltrimethoxysilane with a purity of ≥98%.

10. A process for producing a one-component silicone rubber, characterized in that: The one-component silicone rubber according to any one of claims 1 to 9 comprises the following steps: S1. Add a polysiloxane base polymer containing vinyl and phenyl groups to a high-speed stirring device and stir at a speed of 1500-1800 r / min. Simultaneously, add a composite crosslinking agent and an organotin-amine composite curing accelerator and stir for 15-20 minutes. S2. Add the surface-modified composite filler, antioxidant, UV absorber, montmorillonite intercalant, dynamic imine bond crosslinker and silane coupling agent in sequence, and continue stirring for 20-25 minutes; S3. Transfer the mixture to an ultrasonic dispersion device and ultrasonically disperse it at a power of 400-500 W and a frequency of 60 kHz for 30-40 minutes; S4. Finally, vulcanization molding is performed in a flat vulcanizer at a vulcanization temperature of 110-130° C., a vulcanization pressure of 15-20 MPa, and a vulcanization time of 25-35 minutes to obtain the one-component silicone rubber.

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