High-performance methyl vinyl silicone rubber and preparation method thereof

Abstract

The invention discloses high-performance methyl vinyl silicone rubber, which is characterized by being prepared from the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber raw rubber, 10 to 30 parts of reinforcing filler, 1 to 5 parts of cross-linking agent, 0.01 to 0.1 part of catalyst, 0.01 to 0.1 part of inhibitor and 0.5 to 2 parts of other auxiliaries. The invention belongs to the technical field of silicone rubber, and particularly relates to high-performance methyl vinyl silicone rubber and a preparation method thereof.

Description

Technical Field

[0001] The present invention belongs to the technical field of silicone rubber, and specifically refers to a high-performance methyl vinyl silicone rubber and a preparation method thereof. Background Art

[0002] Methyl vinyl silicone rubber (VMQ) is an important silicone material. Due to its excellent high and low temperature resistance, weather resistance, ozone resistance, electrical insulation and physiological inertness, it is widely used in aerospace, electronics and electrical, automotive industry, medical devices and other fields.

[0003] The tensile strength and tear strength of traditional VMQ rubber are relatively low, making it difficult to meet the usage requirements in high-stress environments; in a long-term high-temperature environment, VMQ rubber is prone to performance attenuation, resulting in a decline in mechanical properties; under the action of high-frequency dynamic stress, VMQ rubber is prone to fatigue failure, restricting its application in shock-absorbing parts and seals; although adding reinforcing fillers (such as fumed silica) can improve the mechanical properties, it will lead to an increase in the viscosity of the rubber compound and a decline in processing performance.

[0004] In order to improve the above problems, the prior art usually makes improvements by means of adding reinforcing fillers, blending modification and crosslinking agent modification. Although the above technologies have improved the performance of VMQ rubber to a certain extent, it is still difficult to simultaneously take into account high mechanical properties, excellent heat resistance, good anti-fatigue performance and processing performance. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that it is difficult for the prior art to take into account performance improvements in multiple aspects.

[0006] In order to achieve the above functions, the technical solution adopted by the present invention is as follows: A high-performance methyl vinyl silicone rubber, characterized in that it is made of the following raw materials in parts by weight: methyl vinyl silicone rubber raw rubber: 100 parts, reinforcing filler: 10 - 30 parts, crosslinking agent: 1 - 5 parts, catalyst: 0.01 - 0.1 part, inhibitor: 0.01 - 0.1 part, other additives: 0.5 - 2 parts.

[0007] Further, the vinyl content range of the methyl vinyl silicone rubber raw rubber is 0.1 - 0.25 mol%, and the average degree of polymerization is between 5500 - 7500.

[0008] Further, the reinforcing filler is modified nano-silica or nano-boron nitride. The modified nano-silica is prepared by surface modification with silane coupling agent KH-570, and the particle size of the nano-boron nitride is 50 - 100 nm.

[0009] Further, the preparation method of the modified nano-silica includes the following steps: a. Dispersing nano-silica in absolute ethanol and performing ultrasonic treatment for 30 minutes to obtain a uniformly dispersed nano-silica suspension; b. Adding silane coupling agent KH-570 to the suspension and stirring and reacting at 60 °C for 2 hours; c. After the reaction is completed, performing centrifugal separation, washing the precipitate with absolute ethanol, and drying to obtain the modified nano-silica.

[0010] Further, the crosslinking agent is hydrogen-containing silicone oil or peroxide crosslinking agent. The hydrogen content of the hydrogen-containing silicone oil is 0.5%-1.5%, and the peroxide crosslinking agent is dicumyl peroxide (DCP).

[0011] Further, the catalyst is chloroplatinic acid isopropanol solution, and the inhibitor is ethynylcyclohexanol.

[0012] Further, the other additives include one or more of pigments, flame retardants, and antioxidants.

[0013] A preparation method of a high-performance methyl vinyl silicone rubber, characterized by including the following steps:

[0014] (1). Adding methyl vinyl silicone rubber raw rubber, reinforcing filler, and other additives into a mixer and kneading at 80-100 °C for 10-15 minutes to obtain a kneaded rubber; (2). Adding the kneaded rubber, crosslinking agent, catalyst, and inhibitor into an open mill and kneading at room temperature for 5-10 minutes to obtain a uniform rubber compound; (3). Putting the rubber compound into a mold and vulcanizing at 160-180 °C for 10-20 minutes to obtain a high-performance methyl vinyl silicone rubber.

[0015] The present invention adopts the above structure and obtains the following beneficial effects: A high-performance methyl vinyl silicone rubber and its preparation method provided by the present invention have excellent mechanical properties, heat resistance, fatigue resistance, and processing properties through optimizing the reinforcing filler, crosslinking system, and preparation process. At the same time, they have diversified functionality and broad application prospects. This technical solution is simple and efficient, easy to industrialize, and has significant economic and social benefits. Specific Embodiments

[0016] The technical solutions of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] Example 1

[0018] A high-performance methyl vinyl silicone rubber proposed by the present invention comprises: 100 parts of methyl vinyl silicone rubber raw rubber, 20 parts of modified nano-silica, 3 parts of hydrogen-containing silicone oil (hydrogen content 1.0%), 0.05 part of chloroplatinic acid isopropanol solution (platinum content 100 ppm), 0.05 part of ethynylcyclohexanol, 0.5 part of antioxidant (pentaerythritol tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate]), and 1 part of pigment (titanium dioxide).

[0019] A preparation method of a high-performance methyl vinyl silicone rubber:

[0020] (1) Preparation of modified nano-silica: Dispersing nano-silica in absolute ethanol, ultrasonic treatment for 30 minutes to obtain a uniform suspension; adding silane coupling agent KH-570, stirring and reacting at 60°C for 2 hours; centrifuging and separating, washing the precipitate with absolute ethanol, and drying to obtain modified nano-silica.

[0021] (2) Kneading: Adding methyl vinyl silicone rubber raw rubber, modified nano-silica, antioxidant, and pigment into a kneader, kneading at 90°C for 12 minutes to obtain a kneaded rubber.

[0022] (3) Crosslinking: Adding the kneaded rubber, hydrogen-containing silicone oil, chloroplatinic acid isopropanol solution, and ethynylcyclohexanol into an open mill, kneading at room temperature for 8 minutes to obtain a uniform rubber compound.

[0023] (4) Vulcanization: Putting the rubber compound into a mold, vulcanizing at 170°C for 15 minutes to obtain a high-performance methyl vinyl silicone rubber.

[0024] Example 2

[0025] A high-performance methyl vinyl silicone rubber proposed by the present invention comprises: 100 parts of methyl vinyl silicone rubber raw rubber, 10 parts of nano-boron nitride (particle size 50 - 100 nm), 1 part of dicumyl peroxide (DCP), 0.8 part of co-crosslinking agent (triallyl isocyanurate), 0.5 part of antioxidant (pentaerythritol tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate]), and 1 part of flame retardant (aluminum hydroxide).

[0026] A preparation method of a high-performance methyl vinyl silicone rubber:

[0027] (1) Kneading: Adding methyl vinyl silicone rubber raw rubber, nano-boron nitride, antioxidant, and flame retardant into a kneader, kneading at 90°C for 12 minutes to obtain a kneaded rubber.

[0028] (2) Crosslinking: Adding the kneaded rubber, dicumyl peroxide, and co-crosslinking agent into an open mill, kneading at room temperature for 8 minutes to obtain a uniform rubber compound.

[0029] (3) Vulcanization: Put the rubber compound into a mold and vulcanize it at 170 °C for 15 minutes to obtain high-performance methyl vinyl silicone rubber.

[0030] Example 3

[0031] A high-performance methyl vinyl silicone rubber proposed by the present invention includes: 100 parts of methyl vinyl silicone rubber raw rubber, 15 parts of modified nano-silica, 5 parts of nano-boron nitride (particle size 50 - 100 nm), 2 parts of hydrogen-containing silicone oil (hydrogen content 1.2%), 0.5 part of dicumyl peroxide (DCP), 0.03 part of chloroplatinic acid isopropanol solution (platinum content 100 ppm), 0.03 part of ethynylcyclohexanol, and 0.5 part of antioxidant (pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]).

[0032] A preparation method of high-performance methyl vinyl silicone rubber:

[0033] (1) Preparation of modified nano-silica: Disperse nano-silica in anhydrous ethanol, ultrasonically treat for 30 minutes to obtain a uniform suspension; add silane coupling agent KH-570, and stir and react at 60 °C for 2 hours; centrifuge and separate, wash the precipitate with anhydrous ethanol, and dry to obtain modified nano-silica.

[0034] (2) Mixing: Put methyl vinyl silicone rubber raw rubber, modified nano-silica, nano-boron nitride, antioxidant, and ultraviolet absorber into a mixer and mix at 90 °C for 12 minutes to obtain a mixed rubber.

[0035] (3) Crosslinking: Put the mixed rubber, hydrogen-containing silicone oil, dicumyl peroxide, chloroplatinic acid isopropanol solution, and ethynylcyclohexanol into an open mill and mix at room temperature for 8 minutes to obtain a uniform rubber compound.

[0036] (4) Vulcanization: Put the rubber compound into a mold and vulcanize it at 170 °C for 15 minutes to obtain high-performance methyl vinyl silicone rubber.

[0037] Summary of examples:

[0038]

[0039] Example 1: Using modified nano-silica as a reinforcing filler, it is suitable for occasions requiring high mechanical properties and heat resistance.

[0040] Example 2: Using nano-boron nitride as a reinforcing filler, it is suitable for occasions requiring high fatigue resistance and conductivity.

[0041] Example 3: Combining modified nano-silica and nano-boron nitride, it has the best comprehensive performance and is suitable for high-performance seals, shock-absorbing parts, conductive materials and other fields

[0042] The above description of the present invention and its embodiments is not restrictive, and the actual structure is not limited thereto. In general, if those of ordinary skill in the art are inspired by it and design, without creative efforts, structural modes and embodiments similar to the technical solution without departing from the gist of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A high performance methyl vinyl silicone rubber, characterized in that: The invention is prepared from the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 10-30 parts of reinforcing filler, 1-5 parts of cross-linking agent, 0.01-0.1 parts of catalyst, 0.01-0.1 parts of inhibitor and 0.5-2 parts of other additives.

2. A high performance methyl vinyl silicone rubber according to claim 1, characterized in that: The vinyl content of the methyl vinyl silicone rubber raw rubber is in the range of 0.1-0.25 mol %, and the average polymerization degree is between 5500-7500.

3. The high performance methyl vinyl silicone rubber according to claim 1, characterized in that: The reinforcing filler is modified nano silicon dioxide or nano boron nitride. The modified nano silicon dioxide is obtained by surface modification with silane coupling agent KH-570. The particle size of the nano boron nitride is 50-100nm.

4. A high performance methyl vinyl silicone rubber according to claim 3, characterized in that: The preparation method of modified nano-silicon dioxide comprises the following steps: a. dispersing nano-silicon dioxide in anhydrous ethanol, and ultrasonically treating for 30 minutes to obtain a uniformly dispersed nano-silicon dioxide suspension; b. adding silane coupling agent KH-570 to the suspension, and stirring and reacting at 60° C. for 2 hours; c. after the reaction is completed, centrifugation is performed, and the precipitate is washed with anhydrous ethanol, and dried to obtain the modified nano-silicon dioxide.

5. The high performance methyl vinyl silicone rubber according to claim 1, characterized in that: The crosslinking agent is hydrogen-containing silicone oil or a peroxide crosslinking agent, the hydrogen content of the hydrogen-containing silicone oil is 0.5%-1.5%, and the peroxide crosslinking agent is dicumyl peroxide (DCP).

6. The high performance methyl vinyl silicone rubber according to claim 1, characterized in that: The catalyst is chloroplatinic acid isopropanol solution.

7. The high performance methyl vinyl silicone rubber and the preparation method thereof according to claim 1, characterized in that: The inhibitor is ethynyl cyclohexanol.

8. The high performance methyl vinyl silicone rubber according to claim 1, characterized in that: The other additives include one or more of pigments, flame retardants, and antioxidants.

9. A method for preparing high-performance methyl vinyl silicone rubber, characterized in that: The following steps are involved: (1) Add methyl vinyl silicone rubber, reinforcing filler and other additives into an internal mixer, and mix at 80-100° C. for 10-15 minutes to obtain a rubber mixture; (2) Add the rubber compound, crosslinking agent, catalyst and inhibitor into an open mixer and mix for 5-10 minutes at room temperature to obtain a uniform rubber compound; (3) Place the rubber material into a mold and vulcanize it at 160-180°C for 10-20 minutes to obtain high-performance methyl vinyl silicone rubber.

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