High-strength and tear-resistant silicone rubber as well as preparation method and application thereof

Abstract

The invention provides high-strength and tear-resistant silicone rubber as well as a preparation method and application thereof, and belongs to the field of silicone rubber. The raw materials in the silicone rubber formula are optimized, the pre-crosslinked silicone oil is prepared firstly, and then the pre-crosslinked silicone oil and the raw silicone rubber are mixed to prepare the high-strength and tear-resistant silicone rubber. Compared with the prior art, the tensile strength of the prepared silicone rubber is effectively improved, the tear resistance of the silicone rubber is remarkably improved, and a new choice is provided for a process for preparing the high-strength and tear-resistant silicone rubber.

Description

Technical Field

[0001] The invention belongs to the field of silicone rubber, and in particular relates to a high-strength, tear-resistant silicone rubber and a preparation method and application thereof. Background Art

[0002] The rubber industry is one of the important basic industries of the national economy, and silicone rubber occupies an irreplaceable position in rubber. Silicone rubber refers to a rubber whose main chain is composed of alternating silicon and oxygen atoms, and the silicon atom is usually connected to two organic groups. Ordinary silicone rubber is mainly composed of siloxane chains containing methyl and a small amount of vinyl. Silicone rubber has many excellent properties: 1. It is resistant to high and low temperatures and can be used in a wide range of temperatures; 2. It has excellent insulation properties, excellent corona resistance and arc resistance; 3. It has better thermal stability, radiation resistance and weather resistance than other polymer materials; 4. It is non-toxic, tasteless, odorless, and does not adhere to human tissue, making it particularly suitable as a medical material. Among them, high-temperature vulcanized silicone rubber (HTV) is widely used in various fields of national economy and life such as aerospace, aviation, electronics, electrical, machinery, automobiles, daily sealing, medical and health care, and plays an important role in national defense, military industry, and high-tech industries. In addition, with the rapid development of science and technology, high-tech products such as robots are slowly entering people's lives and work, and silicone rubber is non-toxic and highly flexible and is expected to become the outer skin of robots. However, although silicone rubber has many good properties that are superior to fluororubber, the application of silicone rubber is still far lower than that of fluororubber. In many fields that have high requirements on rubber strength and tearing properties (such as: building doors and windows, automobiles, footwear, medicine and rubber hoses, etc.), silicone rubber cannot replace fluororubber. This is due to the shortcomings of ordinary high-temperature vulcanized silicone rubber, such as low tensile strength and poor tear resistance, which limits the application of silicone rubber.

[0003] The prior art (patent documents CN119177026A, CN111995872A, CN104725877A, CN118222096A) usually directly adds vinyl silicone oil, silane coupling agent, modified inorganic filler, etc. to enhance the tearing performance of silicone rubber. However, the tearing resistance of silicone rubber prepared by these methods is limited, the method is single and it is difficult to take into account high strength, and the cost of adding modified inorganic fillers is high and the process is complicated. The document (Jia Baoxin. Research on improving the tearing strength and bonding strength of silicone rubber [J]. Rocket Propulsion, 2005, (05): 47-50) discloses a silicone rubber formula for improving the tearing strength and bonding strength of silicone rubber. The formula is based on methyl vinyl silicone rubber and is added with materials such as fumed silica, silazane, hydroxy silicone oil and reinforcing agent. However, the silicone rubber prepared by this formula has the problem of low tensile strength and tear strength. Therefore, it is urgent to develop a silicone rubber with both higher strength and higher tear resistance. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a high-strength, tear-resistant silicone rubber and a preparation method and use thereof.

[0005] The present invention provides a modified silicone rubber, and its preparation method comprises the following steps:

[0006] (1) Preparing pre-crosslinked silicone oil; the pre-crosslinked silicone oil is a product obtained by reacting a mixture of silicone oil, a vulcanizing agent, and a crosslinking agent, or a product obtained by reacting a mixture of silicone oil and a vulcanizing agent;

[0007] (2) mixing the pre-crosslinked silicone oil with the silicone rubber raw rubber to prepare a rubber mix;

[0008] (3) Vulcanizing the rubber mixture to obtain modified silicone rubber.

[0009] Furthermore, its preparation method comprises the following steps:

[0010] (1) Preparing pre-crosslinked silicone oil; the pre-crosslinked silicone oil is a product obtained by reacting a mixture of silicone oil, a vulcanizing agent, and a crosslinking agent, or a product obtained by reacting a mixture of silicone oil and a vulcanizing agent;

[0011] (2) mixing the pre-crosslinked silicone oil with the silicone rubber raw rubber, and then adding the remaining functional fillers to mix, to prepare a rubber compound;

[0012] (3) Vulcanizing the rubber mixture to obtain modified silicone rubber.

[0013] Furthermore, the remaining functional fillers are selected from one or more of inorganic fillers, metal oxides, reinforcing agents, processing aids, and colorants.

[0014] Furthermore, it is prepared from the following raw materials in parts by mass: 90-110 parts of silicone rubber, 5-15 parts of silicone oil, 1-5 parts of vulcanizing agent, 0-1 part of crosslinking agent, 20-60 parts of inorganic filler, and 1-3 parts of metal oxide.

[0015] Furthermore, it is prepared from the following raw materials in parts by weight: 100 parts of silicone rubber, 10 parts of silicone oil, 2 parts of vulcanizing agent, 50 parts of inorganic filler, and 2 parts of metal oxide;

[0016] Alternatively, it is prepared from the following raw materials in parts by weight: 100 parts of silicone rubber, 10 parts of silicone oil, 2 parts of vulcanizing agent, 0.5 parts of crosslinking agent, 30 parts of inorganic filler, and 2 parts of metal oxide;

[0017] Alternatively, it is prepared from the following raw materials in parts by weight: 100 parts of silicone rubber, 10 parts of silicone oil, 2 parts of vulcanizing agent, 0.5 parts of crosslinking agent, 50 parts of inorganic filler, and 2 parts of metal oxide;

[0018] Alternatively, it is prepared from the following raw materials in parts by mass: 100 parts of silicone rubber, 10 parts of silicone oil, 3 parts of vulcanizing agent, 50 parts of inorganic filler and 2 parts of metal oxide.

[0019] Furthermore, the silicone rubber raw rubber is one or a mixture of two or more of methyl silicone rubber, methyl vinyl silicone rubber, and methyl vinyl phenyl silicone rubber;

[0020] The silicone oil is one or a mixture of two or more of methyl silicone oil, hydroxy silicone oil, methylphenyl silicone oil, methylvinyl silicone oil, and dimethyl silicone oil;

[0021] The vulcanizing agent is one or two of bis(2-5-nitrogen) and bis(2-4-nitrogen);

[0022] The crosslinking agent is one or a mixture of two or more of methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane and vinyltriethoxysilane;

[0023] The inorganic filler is white carbon black;

[0024] The metal oxide is zinc oxide.

[0025] The present invention also provides a method for preparing the modified silicone rubber, the method comprising the following steps:

[0026] (1) Preparing pre-crosslinked silicone oil; the pre-crosslinked silicone oil is a product obtained by reacting a mixture of silicone oil, a vulcanizing agent, and a crosslinking agent, or a product obtained by reacting a mixture of silicone oil and a vulcanizing agent;

[0027] (2) mixing the pre-crosslinked silicone oil with the silicone rubber raw rubber to prepare a rubber mix;

[0028] (3) Vulcanizing the rubber mixture to obtain modified silicone rubber.

[0029] Furthermore, the method comprises the following steps:

[0030] (1) Preparing pre-crosslinked silicone oil; the pre-crosslinked silicone oil is a product obtained by reacting a mixture of silicone oil, a vulcanizing agent, and a crosslinking agent, or a product obtained by reacting a mixture of silicone oil and a vulcanizing agent;

[0031] (2) mixing the pre-crosslinked silicone oil with the silicone rubber raw rubber, and then adding the remaining functional fillers to mix, to prepare a rubber compound;

[0032] (3) Vulcanizing the rubber mixture to obtain modified silicone rubber.

[0033] Furthermore, in step (1), the reaction temperature is 100 to 180° C. and the reaction time is 4 to 12 hours;

[0034] In step (2), the conditions for mixing the pre-crosslinked silicone oil and the silicone rubber are: mixing the pre-crosslinked silicone oil and the silicone rubber at 10-40° C. for 0.5-3 h, and the conditions for adding the remaining functional fillers and mixing them are: mixing at 10-40° C. for 1-5 h; in step (3), the vulcanization is a one-stage vulcanization and a two-stage vulcanization, wherein the conditions for the one-stage vulcanization are a pressure of 10-25 MPa, a temperature of 160-180° C., and a time of 1-40 min; the conditions for the two-stage vulcanization are 100-300° C. and a time of 1-48 h;

[0035] Preferably, in step (1), the reaction temperature is 160° C. and the reaction time is 6 hours;

[0036] In step (2), the conditions for mixing the pre-crosslinked silicone oil and the silicone rubber are: mixing the pre-crosslinked silicone oil and the silicone rubber at 20-30° C. for 1 hour, and the conditions for adding the remaining functional fillers and mixing them are: mixing at 20-30° C. for 4 hours;

[0037] In step (3), the conditions for the first stage vulcanization are pressure 15 MPa, temperature 180° C., and time 5 min; the conditions for the second stage vulcanization are 200° C. and time 4 h.

[0038] The present invention also provides the use of the modified silicone rubber in the fields of aerospace, aviation, electronics, electrical, machinery, automobiles, daily-use sealing, and medical and health care.

[0039] The present invention has achieved the following beneficial effects:

[0040] The present invention optimizes the raw materials in the silicone rubber formula, first prepares pre-crosslinked silicone oil, and then mixes the pre-crosslinked silicone oil with silicone rubber raw rubber to prepare a high-strength, tear-resistant silicone rubber. The present invention provides a new option for the process of preparing high-strength, tear-resistant silicone rubber. Compared with the silicone rubber in the literature (Jia Baoxin. Research on improving the tear strength and bonding strength of silicone rubber [J]. Rocket Propulsion, 2005, (05): 47-50), the silicone rubber prepared by the present invention has a higher tensile strength, which can reach up to 8.80MPa, while the highest tensile strength of the silicone rubber in the literature is only 7.8MPa; and the silicone rubber prepared by the present invention also has a higher tear strength, which can reach 32-41KN / m, while the highest tear strength of the silicone rubber in the literature is only 25.3KN / m. The present invention optimizes the raw materials in the silicone rubber formula and controls the preparation process at the same time. It is found that fillers can only be added after the pre-crosslinked silicone oil and the silicone rubber are completely kneaded. Otherwise, the silicone rubber has not yet been interspersed into the short-chain network, and the fillers will preferentially agglomerate at the crosslinking points of the pre-crosslinked silicone oil, eventually forming gel particles that cannot be mixed with the long-chain silicone rubber.

[0041] Obviously, according to the above contents of the present invention, in accordance with common technical knowledge and customary means in the art, without departing from the above basic technical ideas of the present invention, other various forms of modification, replacement or change may be made.

[0042] The above contents of the present invention are further described in detail below through specific implementation methods in the form of examples. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following examples. All technologies realized based on the above contents of the present invention belong to the scope of the present invention. DETAILED DESCRIPTION

[0043] The raw materials and equipment used in the present invention are all known products, which are obtained by purchasing commercially available products.

[0044] In the formula of the specific embodiment of the present invention, "part" means part by weight, and 1 part is 1 g.

[0045] The method for preparing high-strength, tear-resistant silicone rubber in Examples 1-5 of the present invention is as follows:

[0046] (1) Preparation of pre-crosslinked silicone oil

[0047] Put silicone oil and vulcanizing agent in a container and stir evenly, let it stand until bubbles are completely eliminated, then heat it in a 160°C oven, keep the temperature constant, take it out after 6 hours, and cool it to obtain pre-crosslinked silicone oil;

[0048] Alternatively, silicone oil, vulcanizing agent and crosslinking agent are placed in a container and stirred evenly. After standing for a while until the bubbles are completely eliminated, the container is placed in a 160°C oven and heated while maintaining the temperature constant for 6 hours. After that, the container is taken out and cooled to obtain the pre-crosslinked silicone oil.

[0049] (2) Preparation of rubber compound

[0050] Mix the pre-crosslinked silicone oil and silicone rubber together in a kneader at room temperature for 1 hour, then add the remaining functional fillers and mix together for 4 hours.

[0051] (3) Vulcanization

[0052] The mixed rubber is placed in a flat vulcanizer for one-stage vulcanization and two-stage vulcanization. The first stage vulcanization conditions are 15MPa pressure, 180℃ temperature, and 5min; the second stage vulcanization conditions are 200℃ and 4h. High-strength, tear-resistant silicone rubber is obtained.

[0053] Example 1: Preparation of high-strength, tear-resistant silicone rubber

[0054] Formula: 100 parts of methyl silicone rubber, 10 parts of hydroxy silicone oil, 1 part of liquid bis(25-11), 50 parts of white carbon black, 2 parts of zinc oxide, and 1 part of 45% bis(25-11).

[0055] The raw silicone rubber is methyl silicone rubber, the silicone oil is hydroxy silicone oil, and the vulcanizing agent is liquid bis(25-nitrogen) and 45% bis(25-nitrogen) to prepare high-strength and tear-resistant silicone rubber.

[0056] Example 2: Preparation of high-strength, tear-resistant silicone rubber

[0057] Formula: 100 parts of methyl vinyl silicone rubber, 10 parts of hydroxy silicone oil, 1 part of liquid bis(25-11), 50 parts of white carbon black, 2 parts of zinc oxide, and 1 part of 45% bis(25-11).

[0058] The raw silicone rubber is methyl vinyl silicone rubber, the silicone oil is hydroxy silicone oil, and the vulcanizing agent is liquid bis(25-pentyl) and 45% bis(25-pentyl) to prepare high-strength and tear-resistant silicone rubber.

[0059] Example 3: Preparation of high-strength, tear-resistant silicone rubber

[0060] Formula: 100 parts of methyl vinyl phenyl silicone rubber, 10 parts of methyl silicone oil, 1 part of liquid bis(25-11), 0.5 parts of vinyl triethoxy silane, 30 parts of white carbon black, 2 parts of zinc oxide, and 1 part of 45% bis(25-11).

[0061] The raw silicone rubber is methyl vinyl phenyl silicone rubber; the silicone oil is methyl silicone oil; the vulcanizing agent is liquid bis(2-pentyl)silicone and 45% bis(2-pentyl)silicone; and the crosslinking agent is vinyl triethoxysilane. Thus, a high-strength and tear-resistant silicone rubber is prepared.

[0062] Example 4: Preparation of high-strength, tear-resistant silicone rubber

[0063] Formula: 100 parts of methyl vinyl silicone rubber, 2 parts of methyl vinyl silicone oil, 8 parts of hydroxy silicone oil, 1 part of liquid bis(25-11-ol), 0.5 parts of methyltrimethoxysilane, 50 parts of white carbon black, 2 parts of zinc oxide, and 1 part of 45% bis(25-11-ol).

[0064] The raw silicone rubber is methyl vinyl silicone rubber; the silicone oil is methyl vinyl silicone oil and hydroxy silicone oil; the vulcanizing agent is liquid bis(2-pentyl)silicone and 45% bis(2-pentyl)silicone; and the crosslinking agent is methyl trimethoxysilane. Thus, a high-strength and tear-resistant silicone rubber is prepared.

[0065] Example 5: Preparation of high-strength, tear-resistant silicone rubber

[0066] Formula: 50 parts of methyl vinyl silicone rubber, 50 parts of methyl silicone rubber, 5 parts of dimethyl silicone oil, 5 parts of hydroxy silicone oil, 2 parts of liquid bis(25-11-oxide), 50 parts of white carbon black, 2 parts of zinc oxide, and 1 part of 45% bis(25-11-oxide).

[0067] The silicone rubber raw rubber is methyl vinyl silicone rubber and methyl silicone rubber; the silicone oil is dimethyl silicone oil and hydroxy silicone oil; the vulcanizing agent is liquid bis(25-pentyl) and 45% bis(25-pentyl) to prepare high-strength and tear-resistant silicone rubber.

[0068] The preparation of silicone rubber is compared by comparative examples.

[0069] Comparative Example 1: Preparation of Silicone Rubber

[0070] Formula: 100 parts of methyl silicone rubber, 50 parts of white carbon black, 2 parts of zinc oxide, 1 part of 45% content D25.

[0071] Comparative Example 1 The method for preparing silicone rubber is as follows:

[0072] The raw materials in the formula are mixed in a kneader at room temperature for 4 hours to obtain a rubber compound, and then the rubber compound is placed in a flat vulcanizer for one-stage vulcanization and two-stage vulcanization. The first-stage vulcanization conditions are pressure 15MPa, temperature 180℃, time 5min; the second-stage vulcanization conditions are 200℃, time 4h. Silicone rubber is obtained.

[0073] Comparative Example 2: Preparation of Silicone Rubber

[0074] Formula: 100 parts of methyl vinyl silicone rubber, 50 parts of white carbon black, 2 parts of zinc oxide, 1 part of 45% content dichloroethylene.

[0075] Silicone rubber was prepared by referring to the method of Comparative Example 1.

[0076] The mechanical properties of the samples of the above examples and comparative examples were tested according to the GB / T 528-2009 standard, and the tearing properties of the samples were tested according to the GB / T529-2008 tear strength type B standard. The specific results are shown in Table 1.

[0077] Table 1. Mechanical properties test results of silicone rubber in the examples and comparative examples

[0078]

[0079] It can be seen from Comparative Examples 1 and 2 or Examples 1 and 2 that the tear strength of silicone rubber prepared with methyl vinyl silicone rubber as raw material is better than that of silicone rubber prepared with methyl silicone rubber as raw material. Examples 1 to 5 first prepare pre-crosslinked silicone oil, then prepare rubber compound, and obtain silicone rubber after vulcanization. Compared with Comparative Examples 1 and 2 (pre-crosslinked silicone oil was not prepared), the tear strength of silicone rubber obtained in Examples 1 to 5 is significantly improved. In Examples 3 and 4, vinyl triethoxysilane and methyl trimethoxysilane are added as crosslinking agents for silicone oil. When a small amount is added, the crosslinking of silicone oil can be accelerated to obtain a silicone oil pre-crosslinked body with high crosslinking density and stable network, and then the rubber compound is prepared by mutual matching with silicone rubber. The double network result after vulcanization will be more complete. Example 5 further replaces the type and proportion of silicone rubber raw rubber and silicone oil, and improves the tear strength of silicone rubber compared with Example 1.

[0080] In summary, the present invention provides a high-strength, tear-resistant silicone rubber and a preparation method and use thereof. The present invention optimizes the raw materials in the silicone rubber formula, first prepares a pre-crosslinked silicone oil, and then mixes the pre-crosslinked silicone oil with silicone rubber raw rubber to prepare a high-strength, tear-resistant silicone rubber. Compared with the prior art, the silicone rubber prepared by the present invention effectively improves the tensile strength and significantly improves the tearing performance of the silicone rubber. The present invention provides a new option for the process of preparing high-strength, tear-resistant silicone rubber.

Claims

1. A modified silicone rubber, characterized in that: Its preparation method comprises the following steps: (1) Preparing pre-crosslinked silicone oil; the pre-crosslinked silicone oil is a product obtained by reacting a mixture of silicone oil, a vulcanizing agent, and a crosslinking agent, or a product obtained by reacting a mixture of silicone oil and a vulcanizing agent; (2) mixing the pre-crosslinked silicone oil with the silicone rubber raw rubber to prepare a rubber mix; (3) Vulcanizing the rubber mixture to obtain modified silicone rubber.

2. The modified silicone rubber according to claim 1, characterized in that Its preparation method comprises the following steps: (1) Preparing pre-crosslinked silicone oil; the pre-crosslinked silicone oil is a product obtained by reacting a mixture of silicone oil, a vulcanizing agent, and a crosslinking agent, or a product obtained by reacting a mixture of silicone oil and a vulcanizing agent; (2) mixing the pre-crosslinked silicone oil with the silicone rubber raw rubber, and then adding the remaining functional fillers to mix, to prepare a rubber compound; (3) Vulcanizing the rubber mixture to obtain modified silicone rubber.

3. The modified silicone rubber according to claim 2, characterized in that: The remaining functional fillers are selected from one or more of inorganic fillers, metal oxides, reinforcing agents, processing aids, and colorants.

4. The modified silicone rubber according to any one of claims 1 to 3, characterized in that: It is prepared from the following raw materials in parts by weight: 90-110 parts of silicone rubber, 5-15 parts of silicone oil, 1-5 parts of vulcanizing agent, 0-1 part of crosslinking agent, 20-60 parts of inorganic filler and 1-3 parts of metal oxide.

5. The modified silicone rubber according to claim 4, characterized in that: It is prepared from the following raw materials in parts by weight: 100 parts of silicone rubber, 10 parts of silicone oil, 2 parts of vulcanizing agent, 50 parts of inorganic filler, and 2 parts of metal oxide; Alternatively, it is prepared from the following raw materials in parts by weight: 100 parts of silicone rubber, 10 parts of silicone oil, 2 parts of vulcanizing agent, 0.5 parts of crosslinking agent, 30 parts of inorganic filler, and 2 parts of metal oxide; Alternatively, it is prepared from the following raw materials in parts by weight: 100 parts of silicone rubber, 10 parts of silicone oil, 2 parts of vulcanizing agent, 0.5 parts of crosslinking agent, 50 parts of inorganic filler, and 2 parts of metal oxide; Alternatively, it is prepared from the following raw materials in parts by mass: 100 parts of silicone rubber, 10 parts of silicone oil, 3 parts of vulcanizing agent, 50 parts of inorganic filler and 2 parts of metal oxide.

6. The modified silicone rubber according to claim 4, characterized in that: The silicone rubber raw rubber is one or a mixture of two or more of methyl silicone rubber, methyl vinyl silicone rubber, and methyl vinyl phenyl silicone rubber; The silicone oil is one or a mixture of two or more of methyl silicone oil, hydroxy silicone oil, methylphenyl silicone oil, methylvinyl silicone oil, and dimethyl silicone oil; The vulcanizing agent is one or two of bis(2-5-nitrogen) and bis(2-4-nitrogen); The crosslinking agent is one or a mixture of two or more of methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane and vinyltriethoxysilane; The inorganic filler is white carbon black; The metal oxide is zinc oxide.

7. A method for preparing the modified silicone rubber according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: (1) Preparing pre-crosslinked silicone oil; the pre-crosslinked silicone oil is a product obtained by reacting a mixture of silicone oil, a vulcanizing agent, and a crosslinking agent, or a product obtained by reacting a mixture of silicone oil and a vulcanizing agent; (2) mixing the pre-crosslinked silicone oil with the silicone rubber raw rubber to prepare a rubber mix; (3) Vulcanizing the rubber mixture to obtain modified silicone rubber.

8. The method according to claim 7, characterized in that The method comprises the following steps: (1) Preparing pre-crosslinked silicone oil; the pre-crosslinked silicone oil is a product obtained by reacting a mixture of silicone oil, a vulcanizing agent, and a crosslinking agent, or a product obtained by reacting a mixture of silicone oil and a vulcanizing agent; (2) mixing the pre-crosslinked silicone oil with the silicone rubber raw rubber, and then adding the remaining functional fillers to mix, to prepare a rubber compound; (3) Vulcanizing the rubber mixture to obtain modified silicone rubber.

9. The method according to claim 8, characterized in that Step (1), the reaction temperature is 100 to 180° C. and the reaction time is 4 to 12 hours; In step (2), the conditions for mixing the pre-crosslinked silicone oil and the silicone rubber are: mixing the pre-crosslinked silicone oil and the silicone rubber at 10-40° C. for 0.5-3 hours, and the conditions for adding the remaining functional fillers and mixing them are: mixing at 10-40° C. for 1-5 hours; In step (3), the vulcanization is a one-stage vulcanization and a two-stage vulcanization, wherein the conditions of the one-stage vulcanization are a pressure of 10-25 MPa, a temperature of 160-180° C., and a time of 1-40 min; the conditions of the two-stage vulcanization are 100-300° C. and a time of 1-48 h; Preferably, in step (1), the reaction temperature is 160° C. and the reaction time is 6 hours; In step (2), the conditions for mixing the pre-crosslinked silicone oil and the silicone rubber are: mixing the pre-crosslinked silicone oil and the silicone rubber at 20-30° C. for 1 hour, and the conditions for adding the remaining functional fillers and mixing them are: mixing at 20-30° C. for 4 hours; In step (3), the conditions for the first stage vulcanization are pressure 15 MPa, temperature 180° C., and time 5 min; the conditions for the second stage vulcanization are 200° C. and time 4 h.

10. Use of the modified silicone rubber according to any one of claims 1 to 5 in the fields of aerospace, aviation, electronics, electrical, machinery, automobiles, daily-use sealing, and medical and health care.

Images