CN112646294B - Fluororubber/silicone rubber blend and preparation method thereof - Google Patents
Fluororubber/silicone rubber blend and preparation method thereof Download PDFInfo
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Abstract
The invention discloses fluororubber/silicone rubber blend and a preparation method thereof, wherein the blend is prepared from the following raw materials: 50-80 parts of fluororubber, 75-20 parts of silicone rubber premix, 10-40 parts of reinforcing filler, 1-4 parts of vulcanizing agent, 1-4 parts of auxiliary crosslinking agent, 1-4 parts of silane coupling agent, 1-5 parts of compatibilizer, 0.5-2 parts of processing aid and 1-6 parts of structural control agent. The self-made compatibilizer improves the processing technology, improves the compatibility of the fluororubber and the silicone rubber, and connects two phases through the compatibilizer, so that the unvulcanized rubber cannot be separated with time in the parking process. The Mooney viscosity of the silicone rubber is close to that of the fluororubber by manufacturing the silicone rubber premix rubber, so that the blending property of the fluororubber and the silicone rubber in the processing process is improved. The fluororubber/silicone rubber blend prepared by the invention has the advantages of oil resistance, high and low temperature resistance, chemical medium resistance, low friction coefficient and the like.
Description
Technical Field
The invention relates to the technical field of materials, in particular to fluororubber/silicone rubber blend and a preparation method thereof, which can improve fluororubber/silicone rubber compatibility.
Background
In the field of oil sealing, nitrile rubber and acrylate rubber have been widely used, but with the development of fields such as civil automobiles, military industry, aerospace and the like, the requirements of high temperature resistance and oil resistance of the nitrile rubber and the acrylate rubber cannot be met. While fluororubber has excellent high temperature resistance, oil resistance, solvent resistance and chemical corrosion resistance, but has serious defects in low temperature resistance. Silicone rubber has excellent high and low temperature resistance and electrical properties, but is not resistant to nonpolar oil. The fluorosilicone gel has partial properties of both fluororubber and silicone rubber, but is expensive. A fluororubber/silicone rubber and gum was therefore developed to replace the fluorosilicone gum. However, because the polarity of the fluororubber is different from that of the silicone rubber, the fluororubber and the silicone rubber are incompatible during blending and are easy to phase separation; and the Mooney viscosities of the two materials are greatly different and are difficult to process during blending. Therefore, development of the blend rubber of the fluororubber and the silicone rubber and the preparation method thereof have great significance.
Disclosure of Invention
The invention obtains the high-low temperature resistant, oil resistant and wear resistant fluororubber/silicone rubber combined rubber by improving the fluororubber/silicone rubber compatibility.
The invention adopts the following technical scheme:
the fluororubber/silicone rubber blend is prepared from the following raw materials in parts by weight: 50-80 parts of fluororubber, 75-20 parts of silicone rubber premix, 10-40 parts of reinforcing filler, 1-4 parts of vulcanizing agent, 1-4 parts of auxiliary crosslinking agent, 1-4 parts of silane coupling agent, 1-5 parts of compatibilizer and 0.5-2 parts of processing aid.
The silicone rubber premix is prepared from the following raw materials in parts by weight: 100 parts of silicon rubber, 30-75 parts of white carbon black, 3-7.5 parts of structural control agent and 1-5 parts of silane coupling agent. The Mooney viscosity of the fluororubber is far greater than that of the silicone rubber, and the more the white carbon black is used in the silicone rubber premix rubber, the closer the Mooney viscosity of the silicone rubber premix rubber is to that of the fluororubber, so that the fluororubber and the silicone rubber can be well mixed uniformly.
The compatibilizer is prepared from the following raw materials in parts by weight: 50 parts of fluororubber, 50 parts of silicone rubber and 1-3 parts of vulcanizing agent.
The fluororubber is ternary peroxide vulcanized fluororubber. The silicone rubber in the blend rubber and the premix rubber is methyl vinyl silicone rubber.
The reinforcing filler is one or more of precipitation white carbon black, gas phase white carbon black, diatomite, calcium silicate, barium sulfate and carbon black; the vulcanizing agent is one or more of dicumyl peroxide, di-tert-butyl dicumyl peroxide and di-penta.
The auxiliary cross-linking agent is one or more of triallyl isocyanurate and triallyl isocyanurate.
The silane coupling agent in the blend adhesive and the premix adhesive is one or more of bis- [ gamma- (triethoxysilane) propyl ] tetrasulfide, gamma-aminopropyl triethoxysilane, gamma-methacryloxypropyl trimethoxysilane, vinyl triethoxysilane and gamma-methacryloxypropyl trimethoxysilane.
The processing aid is stearic acid, and the structuring control agent in the premix adhesive is one or more of hydroxyl silicone oil, diphenyl silicon glycol and hexamethyldisilazane.
The preparation method of the fluororubber/silicone rubber blend is characterized by comprising the following steps of:
(1) 50 parts by weight of fluororubber, 50 parts by weight of silicone rubber and 1-3 parts by weight of vulcanizing agent are mixed on an open mill, and after uniform mixing, the mixture is subjected to heat treatment at 150 ℃ for 5-15 min to obtain a compatibilizer, which is called FKM-g-MVQ for short;
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(2) Mixing 100 parts by weight of silicone rubber, 30-75 parts by weight of white carbon black, 3-7.5 parts by weight of a structuring control agent and 1-5 parts by weight of a silane coupling agent in a kneader, and vacuumizing at 130 ℃ for 1h to obtain silicone rubber premix;
(3) Plasticating 50-80 parts by weight of fluororubber in an open mill (6 times of thin pass), adding 0.5-2 parts by weight of processing aid, 10-40 parts by weight of reinforcing filler, 1-4 parts by weight of silane coupling agent and 1-5 parts by weight of compatibilizer prepared in the step (1), uniformly mixing, adding 75-20 parts by weight of silicone rubber premix prepared in the step (2), heating the roller to 150 ℃ for 2-4 min after uniform mixing, cooling the sizing material to 60 ℃ or below after heat treatment, adding 1-4 parts by weight of vulcanizing agent and 1-4 parts by weight of auxiliary crosslinking agent at the roller temperature of 60 ℃, and uniformly mixing.
Compared with the prior art, the invention has at least the following beneficial effects:
1. according to the invention, the compatibility of the fluororubber and the silicone rubber is improved through the self-made compatibilizer and the improved processing technology, and the two phases are connected through FKM-g-MVQ, so that the mechanical property is finally improved.
2. According to the method for manufacturing the silicone rubber premix rubber, the Mooney viscosity of the silicone rubber is close to that of the fluororubber, so that the blending property of the fluororubber and the silicone rubber in the processing process is improved, and the blending time is shortened. In the blend, the damage is usually started in a weak phase, and the silicone rubber premix rubber contains a large amount of filler and coupling agent, so that the white carbon black is segregated in a silicone rubber phase (weak phase) after the fluorine rubber and the silicone rubber are premixed, the silicone rubber is better reinforced, the two-phase mechanical property distribution is more uniform, and the mechanical property of the blend rubber is improved.
3. The fluororubber/silicone rubber blend prepared by the invention has the advantages of oil resistance, high and low temperature resistance, chemical medium resistance, low friction coefficient and the like.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
Silicon rubber premix
Fluororubber/silicone rubber blend
The preparation method of the compatibilizer comprises the following steps:
50 parts of fluororubber raw rubber, 50 parts of silicon rubber raw rubber and 1 part of dicumyl peroxide are mixed on an open mill, and after being uniformly mixed, FKM-g-MVQ compatibilizer is obtained by heat treatment at 150 ℃ for 10min.
The preparation method of the silicone rubber premix rubber comprises the following steps:
100 parts of raw silicone rubber, 70 parts of precipitated white carbon black, 7 parts of hydroxyl silicone oil and 3 parts of vinyl triethoxysilane are added into a kneader, kneaded for 30min, and the temperature is raised to 130 ℃ and vacuumized for 1h to obtain the silicone rubber premix.
The preparation method of the fluororubber/silicone rubber blend comprises the following steps:
1. and plasticating 80 parts of ternary peroxide vulcanized fluororubber on an open mill for 6 times, then adding 1 part of stearic acid, 16 parts of white carbon black by a precipitation method, 3 parts of silane coupling agent vinyl triethoxysilane and 3 parts of compatibilizer obtained in the step.
2. And (3) adding 35.7 parts of the silicone rubber premix obtained in the step (II) and uniformly mixing.
3. And taking down the rubber compound, raising the temperature of the open mill to 150 ℃, and carrying out heat treatment on the rubber compound for 3min.
4. And after heat treatment, cooling the sizing material to 60 ℃, cooling the roller of an open mill to 60 ℃, and adding 2 parts of vulcanizing agent di-tert-butyl dicumyl peroxide and 2 parts of auxiliary crosslinking agent triallyl isocyanurate. And mixing uniformly to obtain the fluororubber/silicone rubber blend.
And fourthly, vulcanizing the fluororubber/silicone rubber blend obtained in the step by adopting a flat vulcanizing machine at the vulcanizing temperature of 170 ℃ for 10min.
And fifthly, placing the obtained test piece into an oven for secondary vulcanization, wherein the temperature of the oven is 200 ℃ and 4 hours.
The physical and mechanical properties of the fluororubber/silicone rubber blend are shown in table 1.
TABLE 1 Properties of the fluororubber/Silicone rubber blend prepared in example 1
Remarks: compression set (200 ℃ C. 24h, compression ratio 25%), oil resistant volume change rate (3 # oil, 150 ℃ C. 72 h).
Example 2
Silicon rubber premix
Fluororubber/silicone rubber blend
The preparation method of the compatibilizer comprises the following steps:
50 parts of fluororubber raw rubber, 50 parts of silicon rubber raw rubber and 1 part of dicumyl peroxide are mixed on an open mill, and after being uniformly mixed, FKM-g-MVQ compatibilizer is obtained by heat treatment at 150 ℃ for 10min.
The preparation method of the silicone rubber premix rubber comprises the following steps:
100 parts of methyl vinyl silicone rubber (0.15% vinyl content), 70 parts of precipitated white carbon black, 3 parts of vinyl triethoxysilane and 7 parts of hydroxyl silicone oil are added into a kneader, kneaded for 30min, and the temperature is raised to 130 ℃ and vacuumized for 1h to obtain the silicone rubber premix.
The preparation method of the fluororubber/silicone rubber blend comprises the following steps:
1. and plasticating 60 parts of ternary peroxide vulcanized fluororubber on an open mill for 6 times, and then adding 1 part of stearic acid, 12.9 parts of precipitated white carbon black, 3 parts of gamma-methacryloxypropyl trimethoxy silane and 3 parts of compatibilizer obtained in the step.
2. And (3) adding 72.4 parts of the silicone rubber premix obtained in the step (II) and uniformly mixing.
3. And taking down the rubber compound, raising the temperature of the open mill to 150 ℃, and carrying out heat treatment on the rubber compound for 3min.
4. And cooling the sizing material after heat treatment, cooling the open mill to 60 ℃, adding 2 parts of di-tert-butyl dicumyl peroxide and 2 parts of auxiliary cross-linking agent triallyl isocyanurate, and uniformly mixing to obtain the fluororubber/silicone rubber blend.
And fourthly, vulcanizing the fluororubber/silicone rubber blend obtained in the step, wherein the vulcanizing temperature is 170 ℃ and 4min.
And fifthly, putting the test piece obtained in the step into an oven for secondary vulcanization, wherein the temperature of the oven is 200 ℃ and 4 hours.
The physical and mechanical properties of the fluororubber/silicone rubber blend are shown in table 2, and the same test criteria as in example 1 were used.
TABLE 2 Properties of the fluororubber/Silicone rubber blend prepared in example 2
When the same silicone rubber premix is used in examples 1 and 2, the blend is prepared, and the fluororubber of example 1 and the silicone rubber premix are less, and it can be seen from the performance data of the fluororubber/silicone rubber blend prepared in examples 1 and 2 that as the silicone rubber content increases, the hardness increases, the mechanical properties decrease, the low temperature resistance improves, the compression set decreases, the oil resistance deteriorates, and the static friction coefficient decreases.
Example 3
Silicon rubber premix
Fluororubber/silicone rubber blend
The preparation method of the compatibilizer comprises the following steps:
50 parts of fluororubber raw rubber, 50 parts of silicon rubber raw rubber and 1 part of dicumyl peroxide are mixed on an open mill, and after being uniformly mixed, FKM-g-MVQ compatibilizer is obtained by heat treatment at 150 ℃ for 10min.
The preparation method of the silicone rubber premix rubber comprises the following steps:
90 parts of silicon rubber (0.15% vinyl content) and 10 parts of silicon rubber (5% vinyl content) are added into a kneader, kneading is carried out for 30min, the temperature is raised to 130 ℃, and vacuum pumping is carried out for 1h, thus obtaining the silicon rubber premix rubber.
The preparation method of the fluororubber/silicone rubber blend comprises the following steps:
1. and plasticating 80 parts of ternary peroxide vulcanized fluororubber on an open mill for 6 times, then adding 1 part of stearic acid, 22.7 parts of fumed silica, 3 parts of vinyl triethoxysilane and 3 parts of compatibilizer obtained in the step of preparing the mixture, and uniformly mixing the mixture.
2. And (3) adding 30.3 parts of the silicone rubber premix obtained in the step (II) and uniformly mixing.
3. And taking down the rubber compound, raising the temperature of the open mill to 150 ℃, and carrying out heat treatment on the rubber compound for 3min.
4. And cooling the sizing material after heat treatment, cooling the open mill to 60 ℃, and adding 2 parts of di-tert-butyl dicumyl peroxide and 2 parts of auxiliary cross-linking agent triallyl isocyanurate. And finally obtaining the fluororubber/silicone rubber blend after uniform mixing.
And fourthly, vulcanizing the fluororubber/silicone rubber blend obtained in the step, wherein the vulcanizing temperature is 170 ℃ and 4min.
And fifthly, putting the test piece obtained in the step into an oven for secondary vulcanization, wherein the temperature of the oven is 200 ℃ and 4 hours.
The physical and mechanical properties of the fluororubber/silicone rubber blend are shown in table 3, and the same test criteria as in example 1 were used.
TABLE 3 Properties of the fluororubber/Silicone rubber blend prepared in example 3
Example 4
Silicon rubber premix
Fluororubber/silicone rubber blend
The preparation method of the compatibilizer comprises the following steps:
50 parts of fluororubber raw rubber, 50 parts of silicon rubber raw rubber and 1 part of dicumyl peroxide are mixed on an open mill, and after being uniformly mixed, FKM-g-MVQ compatibilizer is obtained by heat treatment at 150 ℃ for 10min.
The preparation method of the silicone rubber premix rubber comprises the following steps:
90 parts of silicon rubber (0.15% vinyl content) and 10 parts of silicon rubber (5% vinyl content) are added into a kneader in a proportion of 35 parts of fumed silica, 5 parts of hydroxyl silicone oil and 3 parts of vinyl triethoxysilane, kneaded for 30min, and the temperature is raised to 130 ℃ and vacuumized for 1h to obtain the silicon rubber premix.
The preparation method of the fluororubber/silicone rubber blend comprises the following steps:
1. and plasticating 80 parts of ternary peroxide vulcanized fluororubber on an open mill for 6 times, then adding 1 part of stearic acid, 22.7 parts of fumed silica, 3 parts of vinyl triethoxysilane and 1.5 parts of compatibilizer obtained in the step of preparing the raw materials, and uniformly mixing.
2. And (3) adding 30.3 parts of the silicone rubber premix obtained in the step (II) and uniformly mixing.
3. And taking down the rubber compound, raising the temperature of the open mill to 150 ℃, and carrying out heat treatment on the rubber compound for 3min.
4. And cooling the sizing material after heat treatment, cooling the open mill to 60 ℃, and adding 2 parts of di-tert-butyl dicumyl peroxide and 2 parts of auxiliary cross-linking agent triallyl isocyanurate. And mixing uniformly to obtain the fluororubber/silicone rubber blend.
And fourthly, vulcanizing the fluororubber/silicone rubber blend obtained in the step, wherein the vulcanizing temperature is 170 ℃ and 4min.
And fifthly, putting the test piece obtained in the step into an oven for secondary vulcanization, wherein the temperature of the oven is 200 ℃ and 4 hours.
The physical and mechanical properties of the fluororubber/silicone rubber blend are shown in table 4, and the same test criteria as in example 1 were used.
TABLE 4 Properties of the fluororubber/Silicone rubber blend prepared in example 4
Compared with the embodiment 1, when the silicone rubber premix rubber is prepared in the embodiment 3 and the embodiment 4, the methyl vinyl silicone rubber (0.15% of vinyl content) and the methyl vinyl silicone rubber (5% of vinyl content) are adopted for mutual matching, and the use amount of the white carbon black by a precipitation method is halved, so that the mechanical property of the silicone rubber premix rubber is obviously improved. In preparing the blend, example 4 halved the compatibilizer compared to example 3, the two-phase compatibility of the fluororubber/silicone rubber blend was reduced, resulting in a decrease in the mechanical properties of the blend.
Example 5
Silicon rubber premix
Fluororubber/silicone rubber blend
The preparation method of the compatibilizer comprises the following steps:
50 parts of fluororubber raw rubber, 50 parts of silicon rubber raw rubber and 1 part of dicumyl peroxide are mixed on an open mill, and after being uniformly mixed, FKM-g-MVQ compatibilizer is obtained by heat treatment at 150 ℃ for 10min.
The preparation method of the silicone rubber premix rubber comprises the following steps:
90 parts of silicon rubber (0.15% vinyl content) and 10 parts of silicon rubber (5% vinyl content) are added into a kneader, kneading is carried out for 30min, the temperature is raised to 130 ℃, and vacuum pumping is carried out for 1h, thus obtaining the silicon rubber premix rubber.
The preparation method of the fluororubber/silicone rubber blend comprises the following steps:
1. and plasticating 60 parts of ternary peroxide vulcanized fluororubber on an open mill for 6 times, then adding 1 part of stearic acid, 12.9 parts of fumed silica, 3 parts of vinyl triethoxysilane and 3 parts of compatibilizer obtained in the step of preparing the raw materials, and uniformly mixing.
2. And (3) adding 72.4 parts of the silicone rubber premix obtained in the step (II) and uniformly mixing.
3. And taking down the rubber compound, raising the temperature of the open mill to 150 ℃, and carrying out heat treatment on the rubber compound for 3min.
4. And cooling the sizing material after heat treatment, cooling the open mill to 60 ℃, and adding 2 parts of di-tert-butyl dicumyl peroxide and 2 parts of auxiliary cross-linking agent triallyl isocyanurate. And mixing uniformly to obtain the fluororubber/silicone rubber blend.
And fourthly, vulcanizing the fluororubber/silicone rubber blend obtained in the step, wherein the vulcanizing temperature is 170 ℃ and 4min.
And fifthly, putting the test piece obtained in the step into an oven for secondary vulcanization, wherein the temperature of the oven is 200 ℃ and 4 hours.
The physical and mechanical properties of the fluororubber/silicone rubber blend are shown in table 5, and the same test criteria as in example 1 were used.
TABLE 5 Properties of the fluororubber/Silicone rubber blend prepared in EXAMPLE 5
Compared with example 3, example 5 increases the proportion of silicone rubber, and as the content of silicone rubber increases, the hardness of the blend rubber increases, the mechanical properties decrease, the low temperature resistance improves, the compression permanence increases, the oil resistance deteriorates, and the static friction coefficient decreases.
Comparative example 1
Silicon rubber premix
Fluororubber/silicone rubber blend
(1) The preparation method of the silicone rubber premix comprises the following steps:
90 parts of silicon rubber (0.15% vinyl content) and 10 parts of silicon rubber (5% vinyl content) are added into a kneader, kneading is carried out for 30min, the temperature is raised to 130 ℃, and vacuum pumping is carried out for 1h, thus obtaining the silicon rubber premix rubber.
(2) The preparation method of the fluororubber/silicone rubber blend comprises the following steps:
5. 80 parts of ternary peroxide vulcanized fluororubber is plasticated on an open mill for 6 times, and then 1 part of stearic acid, 22.7 parts of white carbon black by a precipitation method and 3 parts of vinyl triethoxysilane are added and uniformly mixed.
6. Adding 30.3 parts of the silicone rubber premix obtained in the step (1), and uniformly mixing.
7. And taking down the rubber compound, raising the temperature of the open mill to 150 ℃, and carrying out heat treatment on the rubber compound for 3min.
8. And cooling the sizing material after heat treatment, cooling the open mill to 60 ℃, and adding 2 parts of di-tert-butyl dicumyl peroxide and 2 parts of auxiliary cross-linking agent triallyl isocyanurate. And finally obtaining the fluororubber/silicone rubber blend after uniform mixing.
(3) And (3) vulcanizing the fluororubber/silicone rubber blend obtained in the step (2) by adopting a flat vulcanizing machine, wherein the vulcanizing temperature is 170 ℃ and 4min.
(4) And (3) putting the test piece obtained in the step (3) into an oven for secondary vulcanization, wherein the temperature of the oven is 200 ℃ and 4 hours.
(5) The physical and mechanical properties of the fluororubber/silicone rubber blend are shown in Table 6, and the same test standards as in example 1 were used.
TABLE 6 Properties of the fluororubber/Silicone rubber blend prepared in comparative example 1
As can be seen from the data in tables 3 and 6, the mechanical properties of the blend are reduced without the compatibilizer compared to example 3, which is the same for comparative example 1.
Comparative example 2
Silicon rubber premix
Fluororubber/silicone rubber blend
The preparation method of the silicone rubber premix comprises the following steps:
90 parts of silicon rubber (0.15% vinyl content), 10 parts of silicon rubber (5% vinyl content), 35 parts of fumed silica, 3 parts of vinyl triethoxysilane and 5 parts of hydroxyl silicone oil are mixed on an open mill, and the mixture is thinned and passed for 10 times after being uniformly mixed (the silicon rubber premix is prepared by uniformly mixing raw rubber, filler and the like without heat treatment), and the mixture is taken off for later use.
The preparation method of the fluororubber/silicone rubber blend comprises the following steps:
9. the fluororubber is plasticated on an open mill for 6 times, and then 1 part of stearic acid, 22.7 parts of precipitated white carbon black and 3 parts of vinyl triethoxysilane are added and mixed uniformly.
10. Adding 30.3 parts of the silicone rubber premix obtained in the step, and uniformly mixing.
11. And taking down the rubber compound, raising the temperature of the open mill to 150 ℃, and carrying out heat treatment on the rubber compound for 3min.
12. And cooling the sizing material after heat treatment, cooling the open mill to 60 ℃, and adding 2 parts of di-tert-butyl dicumyl peroxide and 2 parts of auxiliary cross-linking agent triallyl isocyanurate. And finally obtaining the fluororubber/silicone rubber blend after uniform mixing.
And thirdly, vulcanizing the fluororubber/silicone rubber blend obtained in the step by adopting a flat vulcanizing machine at a vulcanizing temperature of 170 ℃ for 4min.
And fourthly, putting the test piece obtained in the step into an oven for secondary vulcanization, wherein the temperature of the oven is 200 ℃ for 4 hours.
The physical and mechanical properties of the fluororubber/silicone rubber blend are shown in table 7, and the same detection criteria as in example 1 were used.
TABLE 7 Properties of the fluororubber/Silicone rubber blend prepared in comparative example 2
In the process for preparing the fluorosilicone gel, the silicone rubber needs to be prepared into the silicone rubber premix by adopting a premix rubber process, and the silicone rubber can slip when directly added on an open mill, so that the process of adding the silicone rubber into the fluorosilicone rubber is difficult and takes a long time, and the silicone rubber premix rubber is also prepared in comparative example 2, but the preparation method is different from that of examples 1 to 5.
Compared with the example 3, the comparative example 2 does not use a compatibilizer, the other raw materials are the same in dosage, and in the process of preparing the silicone rubber premix, the corresponding raw materials are only thinned and passed through an open mill for 10 times, and the high-temperature vacuumizing process of a kneader is not carried out, so that the mechanical properties of the blend rubber which is not subjected to the high-temperature vacuumizing process of the kneader are obviously reduced as can be seen from the performances of the table 3 and the table 7; comparative example 1 the silicone rubber premix prepared by the method of the present invention, it can be seen from the data of tables 6 and 7 that the tensile strength of the silicone rubber premix was improved after the high temperature vacuum process using a kneader.
Although the invention has been described herein with reference to illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure.
Claims (7)
1. The fluororubber/silicone rubber blend is characterized by being prepared from the following raw materials in parts by weight: 50-80 parts of fluororubber, 75-20 parts of silicone rubber premix, 10-40 parts of reinforcing filler, 1-4 parts of vulcanizing agent, 1-4 parts of auxiliary cross-linking agent, 1-4 parts of silane coupling agent, 1-5 parts of compatibilizer and 0.5-2 parts of processing aid; the silicone rubber premix is prepared from the following raw materials in parts by weight: 100 parts of silicon rubber, 30-75 parts of white carbon black, 3-7.5 parts of a structural control agent and 1-5 parts of a silane coupling agent, wherein 100 parts of silicon rubber, 30-75 parts of white carbon black, 3-7.5 parts of the structural control agent and 1-5 parts of the silane coupling agent are mixed in a kneader, and vacuumizing is carried out at 130 ℃ for 1h to obtain the silicon rubber premix; the compatibilizer is prepared from the following raw materials in parts by weight: 50 parts of fluororubber, 50 parts of silicone rubber and 1-3 parts of vulcanizing agent.
2. The fluororubber/silicone rubber blend according to claim 1, wherein said fluororubber is a ternary peroxide vulcanized fluororubber.
3. The fluororubber/silicone rubber blend according to claim 1, wherein the reinforcing filler is one or more of precipitated silica, fumed silica, diatomaceous earth, calcium silicate, barium sulfate, and carbon black; the vulcanizing agent is one or more of dicumyl peroxide, di-tert-butyl dicumyl peroxide and di-penta.
4. The fluororubber/silicone rubber blend according to claim 1, wherein the auxiliary crosslinking agent is one or more of triallyl isocyanurate and triallyl isocyanurate.
5. The fluororubber/silicone rubber blend according to claim 1, wherein the silane coupling agent is one or more of bis- [ gamma- (triethoxysilyl) propyl ] tetrasulfide, gamma-aminopropyl triethoxysilane, gamma-methacryloxypropyl trimethoxysilane and vinyltriethoxysilane.
6. The fluororubber/silicone rubber blend according to claim 1, wherein the processing aid is stearic acid, and the structuring control agent is one or more of hydroxy silicone oil, diphenyl silicon glycol, and hexamethyldisilazane.
7. The method for preparing the fluororubber/silicone rubber blend according to any one of claims 1 to 6, comprising the following steps:
(1) 50 parts by weight of fluororubber, 50 parts by weight of silicone rubber and 1-3 parts by weight of vulcanizing agent are mixed on an open mill, and after uniform mixing, the mixture is subjected to heat treatment at 150 ℃ for 5-15 min to obtain a compatibilizer, which is abbreviated as FKM-g-MVQ;
(2) Mixing 100 parts by weight of silicone rubber, 30-75 parts by weight of white carbon black, 3-7.5 parts by weight of a structuring control agent and 1-5 parts by weight of a silane coupling agent in a kneader, and vacuumizing at 130 ℃ for 1h to obtain silicone rubber premix;
(3) Plasticating 50-80 parts by weight of fluororubber in an open mill, adding 0.5-2 parts by weight of processing aid, 10-40 parts by weight of reinforcing filler, 1-4 parts by weight of silane coupling agent and 1-5 parts by weight of compatibilizer prepared in the step (1), uniformly mixing, adding 75-20 parts by weight of silicone rubber premix prepared in the step (2), heating the roller to 150 ℃ for 2-4 min after uniform mixing, cooling the sizing material to 60 ℃ or below after heat treatment, adding 1-4 parts by weight of vulcanizing agent and 1-4 parts by weight of auxiliary crosslinking agent at the roller temperature of 60 ℃, and uniformly mixing.
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