Liquid silicone rubber with low viscosity and high elongation at break as well as preparation method and application of liquid silicone rubber

Abstract

The invention relates to the technical field of liquid silicone rubber, and particularly discloses liquid silicone rubber with low viscosity and high elongation at break and a preparation method thereof. The liquid silicone rubber is a two-component system and comprises a component A and a component B. The component A comprises the following components in parts by weight: 35-50 parts of base rubber, 0.01-0.5 part of a catalyst and 1-4.5 parts of polyvinyl silicone oil; and the component B comprises 35-50 parts of base rubber, 4-10 parts of hydrogen-containing silicone oil and 0.2-2 parts of an inhibitor. The base rubber is prepared from the following raw materials in parts by weight: 45-60 parts of vinyl silicone oil, 20-45 parts of white carbon black, 2-8 parts of a white carbon black surface treating agent, 4-10 parts of raw methyl vinyl silicone rubber, 0.1-1 part of a tackifier and 1-5 parts of water. The product disclosed by the invention has the characteristics of low initial viscosity after mixing, high shore hardness after vulcanization and the like, and is relatively good in mechanical property and high in elongation at break. Meanwhile, the product has good fluidity, is suitable for a continuous extrusion production process, and is wide in application field.

Description

Technical Field

[0001] This invention relates to the field of liquid silicone rubber technology, specifically to a low-viscosity, high-elongation-at-break liquid silicone rubber, its preparation method, and its application. Background Technology

[0002] Liquid silicone rubber is an organosilicon material that combines the fluidity of liquid with the elasticity of rubber. Its molecular structure is mainly composed of polysiloxane chains, modified by organic side groups (such as methyl, vinyl, or phenyl). Compared with other rubber materials, liquid silicone rubber has excellent properties such as high and low temperature resistance, electrical insulation, physiological inertness, and weather resistance, and is widely used in electronic packaging, medical devices, automotive parts, and new energy fields. With technological advancements and industrial development, the market demands higher performance from liquid silicone rubber. It requires not only low viscosity to ensure good processing fluidity and permeability, but also high elongation at break to guarantee the flexibility and durability of products under dynamic environments. However, low viscosity and high elongation at break often present a conflict in material design. Achieving an optimal balance between these two has become a pressing technical challenge in the field of liquid silicone rubber.

[0003] The main technical challenges in achieving synergistic optimization of low viscosity and high elongation at break include: 1) The contradiction between filler dispersion and viscosity: Fillers such as fumed silica added to achieve the reinforcing effect improve mechanical properties but significantly increase the viscosity of the system due to the formation of a filler network. High filler content can maintain strength, but viscosity rises sharply, deteriorating processing performance; while low filler content is beneficial for reducing viscosity, it is difficult to build an effective stress transfer network, leading to a decrease in elongation at break. 2) Molecular chain design and performance balance: Molecular chain structure design faces a dilemma. Long-chain molecules are beneficial for improving elongation at break but will significantly increase viscosity; short-chain molecules can reduce viscosity but will reduce molecular chain entanglement points and reduce elongation at break. At the same time, the position and content of active groups such as vinyl groups will also affect the crosslinking network structure. Side-chain vinyl groups can provide more crosslinking points but may increase molecular rigidity, while end-chain vinyl groups are beneficial for forming flexible networks but have limited crosslinking density. 3) Interfacial compatibility and phase separation: When improving performance through blending, copolymerization, or adding modifiers, the compatibility between components directly affects the uniformity of the system. Poor compatibility can lead to phase separation, causing stress concentration and reducing elongation at break. Improving compatibility usually requires adding compatibilizers or surface modification, which may increase the viscosity of the system. 4) Processing technology and final properties: The mixing and shearing history, curing conditions (temperature, time), and post-treatment processes during processing all have a significant impact on the performance of the final product. Optimizing these parameters can alleviate the contradiction between viscosity and elongation at break to some extent, but it cannot fundamentally solve the limitations of the material's intrinsic properties.

[0004] Existing technologies struggle to simultaneously achieve the ideal state of viscosity below 800,000 mPa·s and elongation at break above 600%, and often involve surface modification of nanoparticles or the synthesis of complex prepolymers, which is detrimental to industrial production and cost control. Some low-viscosity systems also face problems such as filler sedimentation and structural changes, resulting in poor stability. Summary of the Invention

[0005] To address the above problems, this invention provides a low-viscosity, high-elongation-at-break liquid silicone rubber, its preparation method, and its application. This liquid silicone rubber maintains high hardness while exhibiting low viscosity (600,000-800,000 mPa·s) and high elongation at break (up to 896%).

[0006] The technical solution of the present invention is a low viscosity, high elongation at break liquid silicone rubber, which is a two-component system comprising component A and component B. By weight, component A comprises 35-50 parts base rubber, 0.01-0.5 parts catalyst and 1-4.5 parts polyvinyl silicone oil; component B comprises 35-50 parts base rubber, 4-10 parts hydrogen-containing silicone oil and 0.2-2 parts inhibitor.

[0007] Further, the base rubber is made from the following raw materials in parts by weight: 45-60 parts vinyl silicone oil, 20-45 parts silica, 2-8 parts silica surface treatment agent, 4-10 parts methyl vinyl silicone rubber raw rubber, 0.1-1 parts tackifier and 1-5 parts water.

[0008] Furthermore, the vinyl silicone oil is at least one of vinyl-terminated polysiloxane and vinyl-terminated phenyl polysiloxane; the silica has a specific surface area of ​​100-400 m² / g. 2 / g of hydrophobic fumed silica; the silica surface treatment agent includes at least one of hexamethyldisilazane, tetramethyldivinyldisilazane, and methyldiphenylethoxysilane; the tackifier is at least one of 3-glycidylpropyltrimethoxysilane, trimethoxymethyl acetate, triethoxyethyl acetate, trimethoxyethyl acetate, triethoxysilane, and trimethoxysilane; the water is deionized water.

[0009] Further, the methyl vinyl silicone rubber raw rubber is at least one of methyl vinyl raw rubber with a vinyl molar content of 0.03%-0.05% and methyl vinyl raw rubber with a vinyl molar content of 1.0%-10.0%.

[0010] Furthermore, in component A, the catalyst is a cassette catalyst, and the vinyl content of the polyvinyl silicone oil is 0.5-9.6%.

[0011] Furthermore, in component B, the hydrogen-containing silicone oil is at least one of side-hydrogen-containing polysiloxane and end-hydrogen-containing polysiloxane; the inhibitor is at least one of C1-C4 alcohol compounds.

[0012] This invention also relates to a method for preparing the liquid silicone rubber, comprising the following steps: S1. Mix a portion of vinyl silicone oil, silica surface treatment agent, methyl vinyl silicone rubber raw rubber and water, add silica in multiple batches, knead and heat at 140-200℃, then add the remaining vinyl silicone oil in multiple batches and vacuum process to obtain the base rubber. S2. Preparation of Component A: Mix the base adhesive, catalyst and polyvinyl silicone oil evenly to obtain Component A; S3. Preparation of Component B: Mix the base adhesive, hydrogen-containing silicone oil and inhibitor evenly to obtain Component B; S4. Mix component A and component B, degas and vulcanize to obtain low viscosity, high elongation at break liquid silicone rubber.

[0013] Furthermore, the silica is added in three parts; the vinyl silicone oil is added in three parts.

[0014] Furthermore, when component A and component B are mixed in S4, the temperature is controlled at 40°C. o Below C; vulcanization temperature is 120-140℃.

[0015] This invention also relates to the application of the liquid silicone rubber in silicone rubber materials for new energy vehicle components, medical catheters, and / or high-voltage insulators. The present invention has the following beneficial effects: (1) The addition-type liquid silicone rubber provided by the present invention has the characteristics of low viscosity and high mechanical properties. By adding polyvinyl silicone oil and adjusting the amount, the lower or higher vinyl content will lead to abnormal crosslinking density of the liquid rubber, affecting the mechanical properties of the liquid silicone rubber. Finally, an addition-type liquid silicone rubber with good mechanical properties at a vulcanization temperature of 120℃ is obtained, with a viscosity of 650000 mPa.s and an elongation at break of 896%.

[0016] (2) The addition-type liquid silicone rubber provided by the present invention has a high elongation at break. By introducing methyl vinyl raw rubber, the ratio of side-containing hydrogen silicone oil and end-containing hydrogen silicone oil is controlled. At the same time, the surface treatment of silica enhances the compatibility between silica and silicone oil. By introducing vinyl groups, the silica interacts with silicone oil through chemical bonds, thereby improving the overall mechanical properties of the liquid silicone rubber. (3) By using polyvinyl silicone oil and hydrogen-containing silicone oil with different hydrogen percentages in the system, the molar ratio of Si-H functional groups to Si-Vi functional groups is 1.5:1-4:1. By utilizing highly dense and abundant active hydrogen groups and increasing the collision probability between Si-H functional groups and Si-Vi functional groups in vinyl silicone oil, liquid silicone rubber with different mechanical properties is obtained. Detailed Implementation

[0017] Unless otherwise specified, the experimental methods used in the following examples are conventional methods. Unless otherwise specified, the materials used in the following examples are commercially available products.

[0018] Example 1 A low-viscosity, high-elongation-at-break liquid silicone rubber and its preparation method, the specific preparation steps are as follows: Preparation of the base adhesive: Take 25 parts of vinyl-terminated long-chain polysiloxane with a viscosity of 60000 mPa·s, 6 parts of hexamethyldisilazane, 0.2 parts of tetramethyldivinyldisilazane, 8 parts of methylvinyl silicone rubber raw rubber with a vinyl molar content of 1.0%, 0.2 parts of trimethoxyethyl acetate, and 2 parts of deionized water, and add them in three batches, totaling 28 parts of a specific surface area of ​​380 m². 2 / g of fumed silica was kneaded in a kneader for 1 hour until the material was evenly dispersed. Heating was then turned on, and the mixture was stirred for 2 hours after the material temperature reached 150℃. After that, vacuum treatment was performed for 1 hour. After vacuum treatment, heating was turned off. Then, 30 parts of vinyl-terminated long-chain polysiloxane were added in three batches, stirred evenly, and vacuum treated for 0.5 hours to obtain the base adhesive.

[0019] Component A, by weight, consists of 40 parts base adhesive, 0.01 parts 20000 PPM caster catalyst, 0.64 parts polyvinyl silicone oil with a vinyl content of 1.22%, and 0.75 parts polyvinyl silicone oil with a vinyl content of 0.58%. These components are then added to a planetary mixer and mixed at -0.1 MPa for 2 hours. Component B, by weight, consists of 40 parts base adhesive, 0.3 parts isopropanol, 4.5 parts side-hydrogen silicone oil with a hydrogen content of 0.75%, and 3.2 parts end-hydrogen silicone oil with a hydrogen content of 0.18%. These components are then mixed at -0.1 MPa for 2 hours. Component A and Component B were mixed evenly in a 1:1 mass ratio. After degassing in a degassing machine for 30 minutes, 70g of the evenly mixed sample was placed into a mold and vulcanized at 120℃ for 10 minutes to obtain transparent silicone rubber. Performance tests were then performed on the product. Shore hardness, tensile strength, elongation at break, tear strength, and viscosity were measured according to GB / T 531.1, GB / T 528-2009 (T-type specimen), GB / T 529-2008 (right-angle specimen), and GB / T 10247-2008, respectively.

[0020] Example 2 A low-viscosity, high-elongation-at-break liquid silicone rubber and its preparation method, the specific preparation steps are as follows: Preparation of the base adhesive: Take 25 parts of vinyl-terminated long-chain polysiloxane with a viscosity of 60000 mPa·s, 4.3 parts of hexamethyldisilazane, 0.2 parts of tetramethyldivinyldisilazane, 8 parts of methyl vinyl silicone rubber raw rubber with a vinyl molar content of 1.0%, 0.2 parts of trimethoxyethyl acetate, and 1.5 parts of deionized water, and add them in three batches, totaling 20 parts of a product with a specific surface area of ​​380 m². 2 / g of fumed silica was kneaded in a kneader for 1 hour until the material was evenly dispersed. Heating was turned on, and the mixture was stirred for 2 hours after the material temperature reached 150℃. Then, vacuum treatment was performed for 1 hour. After vacuum treatment, heating was turned off. Then, 30 parts of vinyl-terminated long-chain polysiloxane were added in three batches, stirred evenly, and vacuum treatment was performed for 0.5 hours to obtain the base adhesive.

[0021] Component A, by weight, consists of 40 parts base adhesive, 0.01 parts 20000 PPM caster catalyst, 1.2 parts polyvinyl silicone oil with a vinyl content of 1.22%, and 0.75 parts polyvinyl silicone oil with a vinyl content of 0.58%. These components are then added to a planetary mixer and mixed at -0.1 MPa for 2 hours. Component B, by weight, consists of 40 parts base adhesive, 0.3 parts isopropanol, 5 parts side-hydrogen silicone oil with a hydrogen content of 0.75%, and 1.6 parts end-hydrogen silicone oil with a hydrogen content of 0.18%. These components are then mixed at -0.1 MPa for 2 hours. Mix component A and component B in a 1:1 mass ratio until homogeneous. After degassing in a degassing machine for 30 minutes, take 70g of the homogeneous mixture and place it into a mold. Cure at 120℃ for 10 minutes to obtain transparent silicone rubber. Perform performance tests on the product.

[0022] Example 3 A low-viscosity, high-elongation-at-break liquid silicone rubber and its preparation method, the specific preparation steps are as follows: Preparation of the base adhesive: Take 25 parts of vinyl-terminated long-chain polysiloxane with a viscosity of 60000 mPa·s, 6 parts of hexamethyldisilazane, 0.2 parts of tetramethyldivinyldisilazane, 8 parts of methylvinyl silicone rubber raw rubber with a vinyl molar content of 1.0%, 0.2 parts of trimethoxyethyl acetate, and 2 parts of deionized water, and add them in three batches, totaling 28 parts of a specific surface area of ​​380 m². 2 / g of fumed silica was kneaded in a kneader for 1 hour until the material was evenly dispersed. Heating was turned on, and the mixture was stirred for 2 hours after the material temperature reached 150℃. Then, vacuum treatment was performed for 1 hour. After vacuum treatment, heating was turned off. Then, 30 parts of vinyl-terminated long-chain polysiloxane were added in three batches, stirred evenly, and vacuum treatment was performed for 0.5 hours to obtain the base adhesive.

[0023] Component A, by weight, consists of 40 parts base adhesive, 0.01 parts 20000 PPM caster catalyst, 3 parts polyvinyl silicone oil with a vinyl content of 1.22%, and 1 part polyvinyl silicone oil with a vinyl content of 0.58%. These components are then added to a planetary mixer and mixed at -0.1 MPa for 2 hours. Component B, by weight, consists of 40 parts base adhesive, 0.3 parts isopropanol, 4.5 parts side-hydrogen silicone oil with a hydrogen content of 0.75%, and 3.2 parts end-hydrogen silicone oil with a hydrogen content of 0.18%. These components are then mixed at -0.1 MPa for 2 hours. Mix component A and component B in a 1:1 mass ratio until homogeneous. After degassing in a degassing machine for 30 minutes, take 70g of the homogeneous mixture and place it into a mold. Cure at 120℃ for 10 minutes to obtain transparent silicone rubber. Perform performance tests on the product.

[0024] Example 4 A low-viscosity, high-elongation-at-break liquid silicone rubber and its preparation method, the specific preparation steps are as follows: Preparation of the base adhesive: Take 25 parts of vinyl-terminated long-chain polysiloxane with a viscosity of 60000 mPa·s, 6 parts of hexamethyldisilazane, 0.2 parts of tetramethyldivinyldisilazane, 4 parts of methylvinyl silicone rubber raw rubber with a vinyl molar content of 1.0%, 0.2 parts of trimethoxyethyl acetate, and 2 parts of deionized water, and add them in three batches, totaling 28 parts of a specific surface area of ​​380 m². 2 / g of fumed silica was kneaded in a kneader for 1 hour until the material was evenly dispersed. Heating was turned on, and the mixture was stirred for 2 hours after the material temperature reached 150℃. Then, vacuum treatment was performed for 1 hour. After vacuum treatment, heating was turned off. Then, 30 parts of vinyl-terminated long-chain polysiloxane were added in three batches, stirred evenly, and vacuum treatment was performed for 0.5 hours to obtain the base adhesive.

[0025] Component A, by weight, consists of 40 parts base adhesive, 0.01 parts 20000 PPM caster catalyst, 0.64 parts polyvinyl silicone oil with a vinyl content of 1.22%, and 0.75 parts polyvinyl silicone oil with a vinyl content of 0.58%. These components are then added to a planetary mixer and mixed at -0.1 MPa for 2 hours. Component B, by weight, consists of 40 parts base adhesive, 0.3 parts isopropanol, 4.5 parts side-hydrogen silicone oil with a hydrogen content of 0.75%, and 3.2 parts end-hydrogen silicone oil with a hydrogen content of 0.18%. These components are then mixed at -0.1 MPa for 2 hours. Mix component A and component B in a 1:1 mass ratio until homogeneous. After degassing in a degassing machine for 30 minutes, take 70g of the homogeneous mixture and place it into a mold. Cure at 120℃ for 10 minutes to obtain transparent silicone rubber. Perform performance tests on the product.

[0026] Example 5: A low-viscosity, high-elongation-at-break liquid silicone rubber and its preparation method, the specific preparation steps are as follows: Preparation of the base adhesive: Take 25 parts of vinyl-terminated long-chain polysiloxane with a viscosity of 60000 mPa·s, 6 parts of hexamethyldisilazane, 0.2 parts of tetramethyldivinyldisilazane, 8 parts of methylvinyl silicone rubber raw rubber, 0.2 parts of trimethoxyethyl acetate, and 2 parts of deionized water, and add them in three batches, totaling 28 parts with a specific surface area of ​​380 m². 2 / g of fumed silica was kneaded in a kneader for 1 hour until the material was evenly dispersed. Heating was turned on, and the mixture was stirred for 2 hours after the material temperature reached 150℃. Then, vacuum treatment was performed for 1 hour. After vacuum treatment, heating was turned off. Then, 30 parts of vinyl-terminated long-chain polysiloxane were added in three batches, stirred evenly, and vacuum treatment was performed for 0.5 hours to obtain the base adhesive.

[0027] Component A, by weight, consists of 40 parts base adhesive, 0.01 parts 20000 PPM caster catalyst, 0.64 parts polyvinyl silicone oil with a vinyl content of 1.22%, and 0.75 parts polyvinyl silicone oil with a vinyl content of 0.58%. These components are then added to a planetary mixer and mixed at -0.1 MPa for 2 hours. Component B, by weight, consists of 40 parts base adhesive, 0.3 parts isopropanol, 8 parts side-hydrogen silicone oil with a hydrogen content of 0.75%, and 1 part end-hydrogen silicone oil with a hydrogen content of 0.18%. These components are then mixed at -0.1 MPa for 2 hours. Mix component A and component B in a 1:1 mass ratio until homogeneous. After degassing in a degassing machine for 30 minutes, take 70g of the homogeneous mixture and place it into a mold. Cure at 120℃ for 10 minutes to obtain transparent silicone rubber. Perform performance tests on the product.

[0028] Example 6: A low-viscosity, high-elongation-at-break liquid silicone rubber and its preparation method, the specific preparation steps are as follows: Preparation of the base adhesive: Take 25 parts of vinyl-terminated long-chain polysiloxane with a viscosity of 60000 mPa·s, 3 parts of hexamethyldisilazane, 0.2 parts of tetramethyldivinyldisilazane, 8 parts of methylvinyl silicone rubber raw rubber, 0.2 parts of trimethoxyethyl acetate, and 1 part of deionized water, and add them in three batches, totaling 28 parts of a product with a specific surface area of ​​380 m². 2 / g of fumed silica was kneaded in a kneader for 1 hour until the material was evenly dispersed. Heating was turned on, and the mixture was stirred for 2 hours after the material temperature reached 150℃. Then, vacuum treatment was performed for 1 hour. After vacuum treatment, heating was turned off. Then, 30 parts of vinyl-terminated long-chain polysiloxane were added in three batches, stirred evenly, and vacuum treatment was performed for 0.5 hours to obtain the base adhesive.

[0029] Component A, by weight, consists of 40 parts base adhesive, 0.01 parts 20000 PPM caster catalyst, 0.64 parts polyvinyl silicone oil with a vinyl content of 1.22%, and 0.75 parts polyvinyl silicone oil with a vinyl content of 0.58%. These components are then added to a planetary mixer and mixed at -0.1 MPa for 2 hours. Component B, by weight, consists of 40 parts base adhesive, 0.3 parts isopropanol, 4.5 parts side-hydrogen silicone oil with a hydrogen content of 0.75%, and 3.2 parts end-hydrogen silicone oil with a hydrogen content of 0.18%. These components are then mixed at -0.1 MPa for 2 hours. Mix component A and component B in a 1:1 mass ratio until homogeneous. After degassing in a degassing machine for 30 minutes, take 70g of the homogeneous mixture and place it into a mold. Cure at 120℃ for 10 minutes to obtain transparent silicone rubber. Perform performance tests on the product.

[0030] Comparative Example 1: The preparation process was the same as in Example 1, but no polyvinyl silicone oil was added to the A glue.

[0031] Comparative Example 2: The preparation process is the same as in Example 1, but without adding raw rubber to the base rubber. Comparative Example 3: The preparation process is the same as in Example 1, but the amount of raw rubber added to the base rubber is changed to 2 parts.

[0032] The performance of a low-viscosity, high-elongation-at-break liquid silicone rubber prepared in the examples and comparative examples was tested, and the results are shown in the table below:

[0033] Examples 1 and 2 show that after reducing the amount of silica used, the internal reinforcing effect of liquid silicone rubber deteriorates and its mechanical properties become worse.

[0034] Examples 4, 2, and 3 demonstrate that varying the amount of methyl vinyl raw rubber added has a significant impact on the mechanical properties of liquid silicone rubber. As the amount of methyl vinyl raw rubber added increases, its elongation at break also increases.

[0035] Examples 1 and 3 show that Example 3 reduced the elongation at break of liquid silicone rubber after using a large amount of vinyl silicone oil; Example 6 reduced the amount of silica surface treatment agent and the mechanical properties were also slightly weakened compared to Example 1; Example 5 changed the amount of side-hydrogen silicone oil and the amount of terminal hydrogen silicone oil, which increased the crosslinking density and decreased the elongation at break.

[0036] The above embodiments describe preferred embodiments of the present invention, but the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other way. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A low-viscosity, high-elongation-at-break liquid silicone rubber, characterized in that, The liquid silicone rubber is a two-component system, comprising component A and component B. By weight, component A comprises 35-50 parts base rubber, 0.01-0.5 parts catalyst and 1-4.5 parts polyvinyl silicone oil; component B comprises 35-50 parts base rubber, 4-10 parts hydrogen-containing silicone oil and 0.2-2 parts inhibitor.

2. The liquid silicone rubber according to claim 1, characterized in that: The base rubber comprises, by weight, the following raw materials: 45-60 parts vinyl silicone oil, 20-45 parts silica, 2-8 parts silica surface treatment agent, 4-10 parts methyl vinyl silicone rubber raw rubber, 0.1-1 parts tackifier, and 1-5 parts water.

3. The liquid silicone rubber according to claim 2, characterized in that: The vinyl silicone oil is at least one of vinyl-terminated polysiloxane or vinyl-terminated phenyl polysiloxane; the silica has a specific surface area of ​​100-400 m². 2 / g of hydrophobic fumed silica; the silica surface treatment agent includes at least one of hexamethyldisilazane, tetramethyldivinyldisilazane, and methyldiphenylethoxysilane; the tackifier is at least one of 3-glycidylpropyltrimethoxysilane, trimethoxymethyl acetate, triethoxyethyl acetate, trimethoxyethyl acetate, triethoxysilane, and trimethoxysilane; the water is deionized water.

4. The liquid silicone rubber according to claim 2, characterized in that: The methyl vinyl silicone rubber raw rubber is at least one of methyl vinyl raw rubber with a vinyl molar content of 0.03%-0.05% and methyl vinyl raw rubber with a vinyl molar content of 1.0%-10.0%.

5. The liquid silicone rubber according to any one of claims 1 to 4, characterized in that: In component A, the catalyst is a cassiterite catalyst, and the vinyl content of the polyvinyl silicone oil is 0.5-9.6%.

6. The liquid silicone rubber according to any one of claims 1 to 4, characterized in that: In component B, the hydrogen-containing silicone oil is at least one of side-hydrogen-containing polysiloxane and end-hydrogen-containing polysiloxane; the inhibitor is at least one of C1-C4 alcohol compounds.

7. The method for preparing liquid silicone rubber according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Mix a portion of vinyl silicone oil, silica surface treatment agent, methyl vinyl silicone rubber raw rubber and water, add silica in multiple batches, knead and heat at 140-200℃, then add the remaining vinyl silicone oil in multiple batches and vacuum process to obtain the base rubber. S2. Preparation of Component A: Mix the base adhesive, catalyst and polyvinyl silicone oil evenly to obtain Component A; S3. Preparation of Component B: Mix the base adhesive, hydrogen-containing silicone oil and inhibitor evenly to obtain Component B; S4. Mix component A and component B, degas and vulcanize to obtain low viscosity, high elongation at break liquid silicone rubber.

8. The preparation method according to claim 7, characterized in that: The silica was added in three parts; the vinyl silicone oil was added in three parts.

9. The preparation method according to claim 7, characterized in that: When component A and component B are mixed in S4, the temperature is controlled at 40°C. o Below C; vulcanization temperature is 120-140℃.

10. The application of the liquid silicone rubber according to any one of claims 1-6 or the liquid silicone rubber obtained by the preparation method according to any one of claims 7-9 in silicone rubber materials for new energy vehicle components, medical catheters and / or high-voltage insulators.

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