Low-cost double-network fluorosilicone rubber and preparation method thereof

Abstract

The invention discloses low-cost double-network fluorinated silicone rubber and a preparation method thereof, and relates to the technical field of fluorinated silicone rubber. The double-network fluorosilicone rubber comprises the following raw materials: vinyl silicone resin, vinyl fluorosilicone resin, hydrogen-containing fluorosilicone oil, a solubilizing monomer, a multifunctional acrylate monomer, a reinforcing filler, a structured control agent, a free radical thermal initiator, a platinum catalyst and an inhibitor. The double-network fluorosilicone rubber is formed by constructing a carbon-carbon chain network and a siloxane network, the tensile strength, toluene swelling resistance and ATF oil resistance at the high temperature of 150 DEG C of the fluorosilicone rubber are obviously improved, the preparation cost of the fluorosilicone rubber is reduced, and a favorable support is provided for widening the application field of the fluorosilicone rubber.

Description

Technical Field

[0001] The invention relates to the technical field of fluorosilicone rubber, and in particular to a low-cost double-network fluorosilicone rubber and a preparation method thereof. Background Art

[0002] Fluorosilicone rubber is an elastomer with polydimethylsiloxane as the main chain and fluoroalkyl as the side chain. It has good chemical resistance, high and low temperature resistance and weather resistance. It has been widely used in seals, gaskets, diaphragms and other accessories in the fields of aerospace, automobiles, electronics and electrical appliances.

[0003] Fluorosilicone rubber addition type liquid fluorosilicone rubber does not produce by-products during the cross-linking vulcanization process, has extremely low shrinkage, can be deeply cured, and can be injection molded and compression molded. It has the advantages of convenient processing, production efficiency, low cost, and energy saving. It is usually vulcanized and molded with vinyl-containing fluorosilicone resin and Si-H bond-containing polysiloxane as a cross-linking agent under the action of a catalyst.

[0004] Chinese invention patent CN202210183753.5 discloses a low-pressure deformation liquid fluorosilicone rubber resistant to engine oil and its preparation method, wherein the fluorosilicone rubber is prepared by using 100 parts of vinyl-terminated fluorosilicone resin, 1.3-2.9 parts of hydrogen-containing fluorosilicone resin, 1-3 parts of hydroxyl fluorosilicone oil, 0.3-0.6 parts of catalyst, 0.05-0.2 parts of inhibitor, 0.1-0.3 parts of heat-resistant additive, 10-20 parts of precipitated silica, etc. The fluorosilicone rubber is immersed in high-temperature engine oil for a long time in a compressed state without causing system damage, and can still maintain a low deformation rate, and has excellent oil pressure deformation resistance.

[0005] Chinese invention patent CN202211042996.3 discloses an ultra-low hardness liquid fluorosilicone rubber and its preparation method. The fluorosilicone rubber uses 100 parts of end-vinyl fluorosilicone resin; 20-30 parts of fumed silica; 4-6 parts of structural control agent; 4-8 parts of methyl fluorosilicone oil; 1-2 parts of distilled water; 0.3-0.6 parts of chain extender; 0.8-1.6 parts of cross-linking agent (hydrogen-containing silicone resin); 0.5-1.0 parts of catalyst; 0.1-0.2 parts of inhibitor. The liquid fluorosilicone rubber can control the hardness within 10 degrees. Since the vinyl content in the vinyl fluorosilicone resin in the addition-type fluorosilicone rubber is relatively low, the vinyl fluorosilicone resin used has a higher content and a larger viscosity, which makes the addition-type fluorosilicone rubber more expensive and difficult to process, thereby limiting the application of fluorosilicone rubber.

[0006] In addition, with the development of industry and new energy vehicle technology, there is an urgent need for sealing materials that can withstand acid and alkali at high temperatures. For example, the sealing materials required for automobile gearboxes contain ATF oil containing acidic substances. In the high-temperature ATF oil environment, the Si-O bond in the organic silicon molecular structure will break, thereby reducing the performance of organic silicon rubber.

[0007] Existing addition-type fluorosilicone rubber has the following problems: 1. High cost; 2. Limited application in high-temperature acidic or alkaline environments. Summary of the invention

[0008] The purpose of the present invention is to provide a low-cost double-network fluorosilicone rubber and a preparation method thereof, so as to solve the problems existing in the above-mentioned prior art.

[0009] To achieve the above object, the present invention provides the following solutions:

[0010] The invention provides a low-cost double-network fluorosilicone rubber, comprising the following raw material components in parts by mass: 0-20 parts of vinyl silicone resin, 80-100 parts of vinyl fluorosilicone resin, 14-33.4 parts of hydrogen-containing fluorosilicone oil, 1-6 parts of solubilizing monomers, 1-3 parts of multifunctional acrylate monomers, 20-30 parts of reinforcing fillers, 2-3 parts of structuring control agents, 0.5-2 parts of free radical thermal initiators, 0.1-0.3 parts of platinum catalysts, and 0.01-0.03 parts of inhibitors.

[0011] As a further preference of the present invention, the vinyl silicone resin is at least one of a vinyl MQ silicone resin (vinyl content of 1.3 to 3 wt%) or a terminal vinyl silicone resin (viscosity of 3000 to 20000 mPa·s (25°C), vinyl content of 0.07 to 0.19 wt%), the vinyl MQ silicone resin has a structure shown in Formula 1, and the terminal vinyl silicone resin has a structure shown in Formula 2.

[0012]

[0013] Vinyl silicone resin can reduce the cost of fluorosilicone rubber, and vinyl MQ silicone resin can reduce the cost of fluorosilicone rubber while increasing its strength.

[0014] As a further preferred embodiment of the present invention, the viscosity of the vinyl fluorosilicone resin is 10000-100000 mPa·s (25° C.), the vinyl content is 0.1-0.7 wt %, and the vinyl fluorosilicone resin has a structure shown in Formula 3:

[0015]

[0016] In formula 3, x:y:z=50~70:0~1:30~50

[0017] As a further preferred embodiment of the present invention, the hydrogen-containing fluorosilicone oil is a hydrogen-containing fluorosilicone oil having a silicon-hydrogen content of 0.16 to 0.7 wt %, and the hydrogen-containing fluorosilicone oil has a structure shown in Formula 4:

[0018]

[0019] In formula 4, x:y:z=50~70:0~1:30~50

[0020] Vinyl fluorosilicone resin and hydrogen-containing fluorosilicone oil are the main silicone rubber raw materials. The vinyl group and silicon-hydrogen bond in their molecular structure have good reactivity, which allows liquid silicone resin to cure into fluorosilicone rubber.

[0021] As a further preferred embodiment of the present invention, the solubilizing monomer is a monomer having a molecular structure as shown in Formula 5:

[0022]

[0023] Specifically, it is at least one of hexafluorobutyl acrylate, pentafluoropropyl acrylate, perfluoroalkylethyl acrylate, hexafluoroisopropyl acrylate, heptafluoroisopropyl acrylate, trifluoroethyl acrylate, dodecafluoroheptyl acrylate, heptafluorobutyl acrylate, 2-(perfluorobutyl)ethyl acrylate, hexafluoroisopropyl methacrylate, 1H,1H-perfluorooctyl acrylate, hexafluorobutyl methacrylate, 1H,1H,2H,2H-tridecafluorooctyl acrylate, trifluoroethyl methacrylate, 1H,1H,2H,2H-perfluorodecyl acrylate, 1H,1H-perfluorooctyl methacrylate, 2-(perfluorobutyl)ethyl methacrylate, 1H,1H,2H,2H-tridecafluorooctyl methacrylate, and 2-(perfluorooctyl)ethyl methacrylate.

[0024] The molecular structure of the solubilizing monomer contains both a fluorine structure and an acrylate structure. Based on similar compatibility, the solubilizing monomer has good compatibility with both fluorosilicone oil and multifunctional acrylate monomer. Therefore, the addition of the solubilizing monomer can improve the compatibility of multifunctional acrylate monomer with fluorosilicone oil. The acrylate bond in the molecular structure of the solubilizing monomer can participate in the curing of the silicone rubber elastomer, avoiding problems such as migration during the use of the silicone rubber elastomer; the fluorine group in the molecular structure can further reduce the surface energy of the silicone rubber elastomer, thereby improving the solvent resistance of the silicone rubber elastomer.

[0025] As a further preferred embodiment of the present invention, the multifunctional acrylate monomer contains two or more acrylate bonds in the molecular structure, specifically: at least one of diethylene glycol diacrylate, propane-1,3-diyl diacrylate, 1,4-butanediol diacrylate, polyethylene glycol diacrylate, trimethylolpropane triacrylate, isopentaerythritol tetraacrylate, triethylene glycol diacrylate, 1,5-bis(acryloxy)pentane, pentaerythritol triacrylate, 1,6-hexanediol diacrylate, 1,9-bis(acryloxy)nonane, 1,10-bis(acryloxy)decane, dipentaerythritol hexaacrylate, tri(2-acryloyloxyethyl) isocyanurate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, ethylene glycol dimethacrylate, dipentaerythritol penta- / hexyl-acrylic acid, and trimethylolpropane trimethacrylate.

[0026] The molecular structure of multifunctional acrylate monomers contains more than two acrylate bonds. The acrylate bonds can react with silicon-hydrogen bonds, vinyl bonds on siloxane and acrylate bonds themselves to form a cross-linked network. The introduction of acrylate-containing monomers into fluorosilicone rubber has the following effects: ①, after the acrylate bonds react with the vinyl bonds on siloxane and the acrylate bonds themselves, the free volume of the material's internal molecular structure will be reduced, increasing the resistance of the solvent to enter the interior of the cured product, thereby improving the solvent resistance of fluorosilicone rubber; ②, the network formed by the reaction of acrylate bonds with the vinyl bonds on siloxane and the acrylate bonds themselves and the network formed by the reaction of acrylate bonds with silicon-hydrogen bonds form a double network structure, which can improve the strength of fluorosilicone rubber; ③, the carbon-carbon network formed by the reaction of acrylate bonds with the vinyl bonds on siloxane and the acrylate bonds themselves has excellent acid or alkali resistance, and can play a certain protective role on the silicon-oxygen bonds in fluorosilicone rubber. ④, the vinyl content in the acrylate-containing monomer is higher than that of vinyl fluorosilicone oil, and a higher amount of hydrogen-containing fluorosilicone oil is required when preparing the rubber compound, which can reduce the viscosity of the rubber compound itself and facilitate processing. ⑤. Rubbers with lower viscosity can add more fillers to reduce costs. At the same time, the cost of acrylate-based monomers and hydrogen-containing fluorosilicone oils is lower than that of vinyl fluorosilicone oils. Therefore, reducing the proportion of vinyl fluorosilicone oils can further reduce costs.

[0027] As a further preferred embodiment of the present invention, the reinforcing filler is at least one of fluorine-modified fumed silica and fluorine-modified precipitated silica.

[0028] As a further preferred embodiment of the present invention, the structuring control agent is at least one of hydroxy silicone oil and hydroxy fluorosilicone oil.

[0029] The addition of reinforcing fillers can improve the mechanical properties of fluorosilicone rubber, and the structuring control agent can prevent the structuring of silica.

[0030] As a further preferred embodiment of the present invention, the free radical thermal initiator is at least one of diisopropylbenzene peroxide, 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane and di-tert-butyl peroxide.

[0031] Thermal initiators contribute to the formation of carbon-carbon networks during the curing process of dual-network fluorosilicone rubber.

[0032] As a further preferred embodiment of the present invention, the platinum catalyst is at least one of a platinum-vinylsiloxane complex and an ethanol-modified chloroplatinic acid catalyst.

[0033] Platinum catalysts are mainly used to catalyze the reaction of silicon-hydrogen bonds and vinyl bonds during the curing process of double-network fluorosilicone rubber.

[0034] As a further preferred embodiment of the present invention, the inhibitor is at least one of 3-methyl-1-butyn-3-ol, 3-methyl-1-pentyn-3-ol, and 3,5-dimethyl-1-hexyn-3-ol.

[0035] Inhibitors can poison the platinum catalyst and increase the storage time of fluorosilicone rubber compounds.

[0036] The present invention also provides a method for preparing a low-cost double-network fluorosilicone rubber, comprising the following steps:

[0037] Vinyl silicone resin and vinyl fluorosilicone resin, or vinyl fluorosilicone resin alone, with reinforcing filler and structural control agent are mixed uniformly at 130-160° C. (preferably 150° C.) for later use, which is recorded as liquid A. Hydrogen-containing fluorosilicone oil, solubilizing monomer, multifunctional acrylate monomer, platinum catalyst, inhibitor and free radical thermal initiator are mixed uniformly, and then added into liquid A, mixed uniformly and bubbles are removed to obtain fluorosilicone rubber compound. The compound is prepared at 130-160° C. (preferably 150° C.) for 15 to 30 minutes to obtain a low-cost double-network fluorosilicone rubber.

[0038] The present invention discloses the following technical effects:

[0039] ①. Preparation of addition-type fluorosilicone rubber at a relatively low cost. The present invention adopts a solubilizing monomer and a multifunctional acrylate monomer containing both a fluorine structure and an acrylate structure in the molecular structure, thereby increasing the vinyl content in the base material and further increasing the amount of hydrogen-containing fluorosilicone oil. The costs of hydrogen-containing fluorosilicone oil, the solubilizing monomer and the multifunctional acrylate monomer are all lower than those of vinyl fluorosilicone oil.

[0040] ②. The viscosity of the liquid fluorosilicone rubber is reduced. The present invention increases the proportion of low-viscosity hydrogen-containing fluorosilicone oil in the rubber material, thereby reducing the viscosity of the liquid fluorosilicone rubber and improving the processing performance of the fluorosilicone rubber.

[0041] ③. Improved solvent resistance of fluorosilicone rubber and chemical resistance in high temperature acidic / alkaline environment. The present invention adopts solubilizing monomers and multifunctional acrylate monomers containing both fluorine structure and acrylate structure, which solves the problem of incompatibility between conventional multifunctional acrylate monomers and organic fluorosilicone resins, and the formed carbon-carbon chain network can protect the polysiloxane network, thereby improving the solvent resistance of fluorosilicone rubber and chemical resistance in high temperature acidic / alkaline environment.

[0042] ④. The strength of fluorosilicone rubber is improved. The acrylate bond introduced in the present invention can react with the vinyl group to form a carbon-carbon chain network, which together with the polysiloxane network forms a double-network structure fluorosilicone rubber, thereby improving the strength of the fluorosilicone rubber. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the double network fluorosilicone rubber structure of the present invention. DETAILED DESCRIPTION

[0044] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0045] It should be understood that the terms described in the present invention are only for describing a particular embodiment and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0046] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0047] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

[0048] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0049] Example 1

[0050] A low-cost dual-network fluorosilicone rubber formula is shown in Table 1:

[0051] Table 1

[0052]

[0053]

[0054] Preparation method of double network fluorosilicone rubber:

[0055] The vinyl fluorosilicone resin alone is mixed with reinforcing filler and structural control agent at 150°C for use, which is recorded as liquid A. Hydrogen-containing fluorosilicone oil, solubilizing monomer, multifunctional acrylate monomer, platinum catalyst, inhibitor, and free radical thermal initiator are mixed evenly, and then added to liquid A, mixed and removed bubbles to obtain fluorosilicone rubber compound. The compound is prepared at 150°C for 15 to 30 minutes to obtain a low-cost double-network fluorosilicone rubber. The schematic diagram of the obtained double-network structure is shown in the figure. Figure 1 shown.

[0056] Example 2

[0057] A low-cost dual-network fluorosilicone rubber formula is shown in Table 2:

[0058] Table 2

[0059]

[0060] The preparation method of double network fluorosilicone rubber is the same as that in Example 1.

[0061] Example 3

[0062] A low-cost dual-network fluorosilicone rubber formula is shown in Table 3:

[0063] Table 3

[0064]

[0065]

[0066] The preparation method of double network fluorosilicone rubber is the same as that in Example 1.

[0067] Example 4

[0068] A low-cost dual-network fluorosilicone rubber formula is shown in Table 4:

[0069] Table 4

[0070]

[0071] The preparation method of double network fluorosilicone rubber is the same as that in Example 1.

[0072] Example 5

[0073] A low-cost dual-network fluorosilicone rubber formula is shown in Table 5:

[0074] Table 5

[0075]

[0076] The preparation method of double network fluorosilicone rubber is the same as that in Example 1.

[0077] Example 6

[0078] A low-cost dual-network fluorosilicone rubber formula is shown in Table 6:

[0079] Table 6

[0080]

[0081] Vinyl silicone resin and vinyl fluorosilicone resin are prepared according to the method for preparing double network fluorosilicone rubber of Example 1.

[0082] Example 7

[0083] A low-cost double-network fluorosilicone rubber formula is shown in Table 7:

[0084] Table 7

[0085]

[0086] Vinyl silicone resin and vinyl fluorosilicone resin are prepared according to the method for preparing double network fluorosilicone rubber of Example 1.

[0087] Example 8

[0088] A low-cost dual-network fluorosilicone rubber formula is shown in Table 8:

[0089] Table 8

[0090]

[0091]

[0092] Vinyl silicone resin (the vinyl silicone resin in this embodiment is vinyl MQ silicone resin) and vinyl fluorosilicone resin are prepared according to the method for preparing double network fluorosilicone rubber of Example 1.

[0093] Example 9

[0094] A low-cost dual-network fluorosilicone rubber formula is shown in Table 9:

[0095] Table 9

[0096]

[0097] Vinyl silicone resin (the vinyl silicone resin in this embodiment is vinyl MQ silicone resin) and vinyl fluorosilicone resin are prepared according to the method for preparing double network fluorosilicone rubber of Example 1.

[0098] Comparative Example 1

[0099] The difference between Comparative Example 1 and Example 1 is that hexafluoroisopropyl acrylate, isopentaerythritol tetraacrylate, and free radical thermal initiator are removed, and in order to keep the molar ratio of vinyl to silicon hydrogen in the rubber material unchanged, the amount of hydrogen-containing fluorosilicone oil (silicon hydrogen content 0.2wt%) and hydrogen-containing fluorosilicone oil (silicon hydrogen content 0.4wt%) are adjusted to 1.84g, and in order to keep the reinforcing filler content of the rubber material unchanged, the amount of fluorine-modified fumed silica is adjusted to 8.52g, and the amount of fluorine-modified precipitated silica is adjusted to 12.78g.

[0100] Fluorosilicone rubber preparation method:

[0101] Mix vinyl fluorosilicone resin, reinforcing filler and structural control agent at 150°C, then add hydrogen-containing fluorosilicone oil, platinum catalyst and inhibitor and mix evenly, remove bubbles to obtain fluorosilicone rubber compound, and keep the compound at 150°C for 15 to 30 minutes to obtain fluorosilicone rubber.

[0102] Effect verification example 1

[0103] Examples 1 to 9 and Comparative Example 1 were tested, wherein the hardness test was based on the ASTM D2240 standard, the tensile strength and elongation at break were based on the ASTM D412 standard, the compression set test was based on the GB / T 7759.1-2015 standard (temperature 80°C, compression 35%), the toluene resistance test was based on the GB / T 1690-2010 full immersion test scheme (test temperature 25°C, time 24h, test volume change), and the ATF oil resistance test was based on the GB / T 1690-2010 specimen non-compression full immersion test scheme (test temperature 130°C or 150°C, time 1000h, test tensile strength change).

[0104] Table 10

[0105]

[0106] It can be seen from Table 10 that a low-cost double-network fluorosilicone rubber prepared by using Examples 1 to 9 of the present invention has good tensile strength, compression permanent deformation and low toluene swelling resistance, and still maintains good mechanical properties in a full immersion test in a 150°C high temperature ATF oil for 1000h without compression. Combined with Comparative Example 1, it can be seen that a low-cost double-network fluorosilicone rubber prepared by the present invention has significantly improved tensile strength, improved toluene swelling resistance and improved ATF oil resistance at a high temperature of 150°C compared with the fluorosilicone rubber prepared by the conventional method. In addition, it can be seen from Examples 1 to 9 that the hydrogen-containing fluorosilicone resin in a low-cost double-network fluorosilicone rubber compound prepared by the present invention accounts for more than 14% of the total amount of vinyl silicone resin and vinyl fluorosilicone resin, or accounts for more than 14% of the total amount of vinyl fluorosilicone resin alone, which is much higher than the amount of hydrogen-containing fluorosilicone resin in other addition-type fluorosilicone rubber compounds (generally at the level of 0.8 to 2.9), reducing the amount of vinyl fluorosilicone resin in the compound, thereby reducing the cost and the viscosity of the compound.

Claims

1. A low-cost double-network fluorosilicone rubber, characterized in that: The invention comprises the following raw material components in parts by weight: 0 to 20 parts of vinyl silicone resin, 80 to 100 parts of vinyl fluorosilicone resin, 14 to 33.4 parts of hydrogen-containing fluorosilicone oil, 1 to 6 parts of solubilizing monomer, 1 to 3 parts of multifunctional acrylate monomer, 20 to 30 parts of reinforcing filler, 2 to 3 parts of structuring control agent, 0.5 to 2 parts of free radical thermal initiator, 0.1 to 0.3 parts of platinum catalyst and 0.01 to 0.03 parts of inhibitor.

2. A low-cost double-network fluorosilicone rubber according to claim 1, characterized in that: The vinyl silicone resin is a vinyl MQ silicone resin with a vinyl content of 1.3 to 3 wt%; and / or a vinyl-terminated silicone resin with a viscosity of 3000 to 20000 mPa·s (25° C.) and a vinyl content of 0.07 to 0.19 wt%; the vinyl MQ silicone resin has a structure shown in Formula 1, and the vinyl-terminated silicone resin has a structure shown in Formula 2.

3. A low-cost double-network fluorosilicone rubber according to claim 1, characterized in that: The viscosity of the vinyl fluorosilicone resin is 10000-100000 mPa·s (25° C.), the vinyl content is 0.1-0.7 wt %, and the vinyl fluorosilicone resin has a structure shown in Formula 3: In formula 3, x:y:z=50~70:0~1:30~50.

4. The low-cost double-network fluorosilicone rubber according to claim 1, characterized in that: The hydrogen-containing fluorosilicone oil has a silicon-hydrogen content of 0.16 to 0.7 wt %. The hydrogen-containing fluorosilicone oil has a structure shown in Formula 4: In formula 4, x:y:z=50~70:0~1:30~50.

5. The low-cost double-network fluorosilicone rubber according to claim 1, characterized in that: The solubilizing monomer is a monomer having a molecular structure of Formula 5: The invention comprises at least one of hexafluorobutyl acrylate, pentafluoropropyl acrylate, perfluoroalkylethyl acrylate, hexafluoroisopropyl acrylate, heptafluoroisopropyl acrylate, trifluoroethyl acrylate, dodecafluoroheptyl acrylate, heptafluorobutyl acrylate, 2-(perfluorobutyl)ethyl acrylate, hexafluoroisopropyl methacrylate, 1H,1H-perfluorooctyl acrylate, hexafluorobutyl methacrylate, 1H,1H,2H,2H-tridecafluorooctyl acrylate, trifluoroethyl methacrylate, 1H,1H,2H,2H-perfluorodecyl acrylate, 1H,1H-perfluorooctyl methacrylate, 2-(perfluorobutyl)ethyl methacrylate, 1H,1H,2H,2H-tridecafluorooctyl methacrylate and 2-(perfluorooctyl)ethyl methacrylate.

6. The low-cost double-network fluorosilicone rubber according to claim 1, characterized in that: The multifunctional acrylate monomer contains more than two acrylate bonds in the molecular structure, including at least one of diethylene glycol diacrylate, propane-1,3-diyl diacrylate, 1,4-butanediol diacrylate, polyethylene glycol diacrylate, trimethylolpropane triacrylate, isopentaerythritol tetraacrylate, triethylene glycol diacrylate, 1,5-bis(acryloxy)pentane, pentaerythritol triacrylate, 1,6-hexanediol diacrylate, 1,9-bis(acryloxy)nonane, 1,10-bis(acryloxy)decane, dipentaerythritol hexaacrylate, tri(2-acryloyloxyethyl) isocyanurate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, ethylene glycol dimethacrylate, dipentaerythritol penta- / hexyl-acrylic acid, and trimethylolpropane trimethacrylate.

7. The low-cost double-network fluorosilicone rubber according to claim 1, characterized in that: The reinforcing filler is at least one of fluorine-modified fumed silica and fluorine-modified precipitated silica.

8. The low-cost double-network fluorosilicone rubber according to claim 1, characterized in that: The structuring control agent is at least one of hydroxy silicone oil and hydroxy fluorosilicone oil.

9. The low-cost double-network fluorosilicone rubber according to claim 1, characterized in that: The free radical thermal initiator is at least one of diisopropylbenzene peroxide, 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane and di-tert-butyl peroxide.

10. The low-cost double-network fluorosilicone rubber according to claim 1, characterized in that: The platinum catalyst is at least one of a platinum-vinylsiloxane complex and an ethanol-modified chloroplatinic acid catalyst.

11. The low-cost double-network fluorosilicone rubber according to claim 1, characterized in that: The inhibitor is at least one of 3-methyl-1-butyn-3-ol, 3-methyl-1-pentyn-3-ol, and 3,5-dimethyl-1-hexyn-3-ol.

12. A low-cost method for preparing a double-network fluorosilicone rubber, used for preparing the double-network fluorosilicone rubber according to any one of claims 1 to 11, characterized in that: The following steps are involved: Vinyl silicone resin and vinyl fluorosilicone resin, or vinyl fluorosilicone resin alone, with reinforcing filler and structural control agent are mixed uniformly at 130-160°C for use, which is recorded as liquid A. Hydrogen-containing fluorosilicone oil, solubilizing monomer, multifunctional acrylate monomer, platinum catalyst, inhibitor and free radical thermal initiator are mixed uniformly, and then added into liquid A, mixed uniformly and bubbles are removed to obtain fluorosilicone rubber compound. The compound is prepared at 130-160°C for 15-30 minutes to obtain a low-cost double-network fluorosilicone rubber.

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