Preparation method of carbon fiber reinforced wear-resistant fluororubber fabric combination v-shaped sealing ring

Abstract

The application discloses a preparation method of a carbon fiber reinforced wear-resistant fluororubber fabric combination V-shaped sealing ring, and steps of the method comprise the following steps: step 1, roughening treatment is performed on the surface of carbon fibers; step 2, roughening treatment is performed on the surface of aramid fabric; step 3, a carbon fiber dispersion liquid is prepared; step 4, a fluororubber rubber compound is prepared; step 5, an aramid / fluororubber composite material is prepared; and step 6, a fluororubber fabric combination V-shaped sealing ring is prepared. The preparation method avoids the problem of uneven dispersion of the chopped carbon fibers when mixed with the fluororubber rubber compound, improves the uniformity of the product, improves the wear resistance of the fluororubber material, improves the adhesion between the fibers and the rubber matrix by roughening treatment on the surfaces of the carbon fibers and the aramid fabric, thereby improving the tensile and tear resistance of the composite material, and the corrosion resistance of the sealing ring is obviously improved by increasing fluorinated carbon black in the fluororubber filler.

Description

Technical Field

[0001] This invention belongs to the field of wear-resistant fluororubber product manufacturing technology, and relates to a method for preparing a carbon fiber reinforced wear-resistant fluororubber fabric-insulated V-shaped sealing ring. Background Technology

[0002] Packing seals are one of the earliest sealing technologies. During use, because the packing is in direct contact with reciprocating or rotating shafts, it is prone to wear. Friction leads to wear of the sealing material, reducing sealing effectiveness and shortening the service life of the seal. Furthermore, in equipment such as pumps and compressors in the chemical and petrochemical industries, the sealing packing is frequently exposed to high-temperature, high-pressure, and highly corrosive media containing tiny solid particles. This poor sealing environment causes rapid wear and short service life of the seals. Once a seal fails, leakage of the working medium leads to material loss, causing energy loss, environmental pollution, and equipment malfunction affecting continuous production. In severe cases, it can endanger human health and safety. Therefore, the reliability, durability, and stability of packing seals are crucial for safe chemical production. With continuous technological development and increasing demands, the cross-sectional shape of the sealing ring has evolved from the initial O-type and rectangular shapes to more complex packing seal forms such as V-type, U-type, Y-type, and L-type.

[0003] Fluororubber (FR), a type of rubber with special properties, possesses a variety of excellent properties due to the stable CF bonds formed by fluorine and carbon atoms, and the strong adsorption effect of fluorine atoms. However, it still suffers from poor wear resistance, low strength, and poor low-temperature performance, which seriously hinders its widespread use. Pitch-based carbon fiber. (GPFC (carbon fiber reinforced rubber composite) is a high-performance fiber that not only possesses high specific strength and modulus, good corrosion resistance and self-lubricating properties, but also excellent heat resistance. In an oxidizing environment, its operating temperature can reach 2000℃, far exceeding that of metallic materials, and the higher the temperature, the greater the fiber strength. It also exhibits excellent thermal conductivity, even surpassing that of copper. It is often added as a reinforcing material to resins, metals, ceramics, and other materials, improving not only their mechanical properties but also their heat resistance and thermal conductivity. It has become one of the most important reinforcing materials in advanced composite materials. Chinese patents CN201710874204.1 and CN201710388755.7 both relate to a method for preparing carbon fiber reinforced rubber composites. In preparing these composites, carbon fiber is typically mixed with natural rubber or butadiene rubber to form a sheet, which is then vulcanized to obtain a sealing material. However, this method suffers from uneven mixing of carbon fiber with other materials, affecting the performance of the composite material. Although Chinese patent CN201911366836.2 uses a plasticizer to mix carbon fiber with compounded rubber, the mixing effect is still not ideal. Chinese patent CN20071003158.2X relates to a method for preparing a fluororubber-reinforced fabric V-shaped sealing ring. However, it is designed for sealing rings used in water-glycol fire-resistant hydraulic fluid applications. While it solves the problems of stability and fire resistance of fluororubber mortar, the reinforcing fabric layer used is glass fiber. However, its wear resistance is poor, making it unsuitable for harsh environments with high abrasion.

[0004] In summary, the main drawbacks of existing technologies include: 1) poor uniformity in the mixing of carbon fiber with rubber and other ingredients, resulting in poor sealing performance and short service life under high temperature, high pressure, and high wear conditions, necessitating improvements in wear resistance; 2) weak bonding between the fiber and the rubber matrix, leading to low tensile and tear resistance in the composite material. Therefore, it is urgent to develop new preparation processes to improve the overall performance of carbon fiber-reinforced wear-resistant fluororubber. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing a carbon fiber reinforced wear-resistant fluororubber-insulated V-shaped sealing ring, which solves the problem that existing technologies cannot simultaneously meet the requirements of high temperature, high pressure, and high wear conditions, and cannot simultaneously achieve wear resistance, tensile strength, and tear resistance.

[0006] The technical solution adopted in this invention is a method for preparing a carbon fiber reinforced wear-resistant fluororubber-insulated V-shaped sealing ring, which is implemented according to the following steps:

[0007] Step 1: Roughen the surface of the carbon fiber;

[0008] Step 2: Roughen the surface of the aramid canvas;

[0009] Step 3: Prepare carbon fiber dispersion;

[0010] Step 4: Prepare fluororubber compound;

[0011] Step 5: Prepare aramid / fluororubber composite material;

[0012] Step 6: Prepare a fluororubber-insulated fabric V-shaped sealing ring.

[0013] The beneficial effects of this invention include the following aspects:

[0014] 1) By uniformly dispersing short-cut pitch-based carbon fibers in a solvent to form a carbon fiber dispersion, and then mixing it with fluororubber compound to form a uniform fluororubber slurry, the problem of uneven dispersion when short-cut carbon fibers are mixed with fluororubber compound is avoided, thus improving the uniformity of the product.

[0015] 2) The V-shaped sealing ring with fluororubber and fabric is made of high-strength aramid canvas to form an aramid / fluororubber composite material, which improves the wear resistance of the fluororubber in the material.

[0016] 3) By roughening the surface of carbon fiber and aramid canvas, the bonding force between the fiber and the rubber matrix is ​​improved, thereby improving the tensile and tear resistance of the composite material.

[0017] 4) The addition of fluorinated carbon black to the fluororubber filler significantly improves the corrosion resistance of the sealing ring. Attached Figure Description

[0018] Figure 1 This is a simplified flowchart of the preparation method of the present invention. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] Reference Figure 1 The preparation method of the present invention is used to prepare a carbon fiber reinforced wear-resistant fluororubber-insulated V-shaped sealing ring (hereinafter referred to as "fluororubber-insulated V-shaped sealing ring"), and is carried out according to the following steps:

[0021] Step 1: Roughen the surface of the carbon fiber.

[0022] Equal volumes of 40wt% H2SO4 and 15wt% KClO3 are mixed evenly to form etching solution A. Carbon fibers are then immersed in etching solution A and soaked at 85-100℃ for 90-120 minutes. The soaked carbon fibers are then dried.

[0023] Step 2: Roughen the surface of the aramid canvas.

[0024] Using a 30wt% H2PO4 acidic solution as etching solution B, aramid canvas was immersed in etching solution B and soaked at 30-35℃ for 6-7 hours. The soaked aramid canvas was then dried.

[0025] Step 3: Prepare carbon fiber dispersion.

[0026] Weigh out 100 parts of 120# solvent oil, 0.7 parts of dispersant, and 5 parts of short-cut carbon fibers with a length of 5 mm according to the mass ratio. Mix the three components together and mechanically stir for 1 to 2 hours to obtain a uniform carbon fiber dispersion.

[0027] The dispersant is selected from one or two of the following: Span 80, sorbitan olive oil ester, and diisobutyl PEG / PPG-10 / 7 / dimethylsiloxane copolymer (FZ-2233) (oil-soluble surfactant).

[0028] Step 4: Prepare fluororubber compound.

[0029] By weight, 100 parts of fluororubber (FE2463), 10-30 parts of diatomaceous earth, 10-20 parts of fluorinated graphite, 2-4 parts of nano magnesium oxide, 0.5-1.5 parts of accelerator CZ, 0.5-1.5 parts of antioxidant RD, 1-3 parts of bisphenol AF, 0.5-1.5 parts of vulcanizing agent BPP, 1-5 parts of sodium stearate, 1-5 parts of triallyl cyanurate, and 1-3 parts of iron oxide red are added to a mixing device and mixed evenly to obtain fluororubber compound.

[0030] The mixing process parameters are: mixing temperature 90℃-120℃; mixing time 20-30 minutes; mixing speed 30-50 rpm.

[0031] The components and their mass fractions of the fluororubber compound in this step are shown in Table 1 below.

[0032] Table 1. Main components and content of sealing rings

[0033] Component Name Quality Teflon rubber 100 diatomite 10～30 Fluorographite 10～20 Nano magnesium oxide 2～4 Accelerator CZ 0.5～1.5 Anti-aging agent RD 0.5～1.5 Bisphenol AF 1～3 BPP vulcanizing agent 0.5～1.5

[0034] Step 5: Prepare aramid / fluororubber composite material.

[0035] First, methyl isobutyl ketone and butyl acetate are mixed evenly at a mass ratio of 100-150:50-100 to obtain a mixed solvent; then, the fluororubber compound obtained in step 4, the carbon fiber dispersion obtained in step 3, and the mixed solvent are weighed and added to a mixer, and stirred for 2-4 hours to obtain a fluororubber slurry; the mass ratio of the fluororubber compound, the carbon fiber dispersion, and the mixed solvent is 100:50-200:150-200.

[0036] Then, the obtained fluoropolymer paste is applied to aramid fiber cloth using a scraper. The aramid fiber cloth is selected with a unit area mass of 550-600 g / m². 2 Aramid / fluororubber composite material with a thickness of 0.62-0.65 mm is obtained after drying, and the thickness is 0.8-0.85 mm.

[0037] Step 6: Prepare a fluororubber-reinforced fabric V-shaped sealing ring.

[0038] First, the aramid / fluororubber composite material obtained in step 5 is pre-formed and then placed into a vulcanization mold. It is vulcanized at 165-185℃ for 2-3 hours. After trimming the flash, a fluororubber-reinforced fabric V-shaped sealing ring is obtained.

[0039] Then, the fluororubber-reinforced fabric V-shaped sealing ring is combined with the corresponding support ring and pressure ring according to the process requirements to obtain the fluororubber-reinforced fabric combined V-shaped sealing ring. The support ring and pressure ring are both made of polytetrafluoroethylene.

[0040] Example 1

[0041] The steps for preparing carbon fiber reinforced fluororubber / aramid / fluororubber composite V-shaped sealing rings are as follows:

[0042] Step 1: Roughen the surface of the carbon fiber.

[0043] Using an acidic solution of 40wt% H2SO4 and 15wt% KClO3 of equal mass as etching solution A, carbon fibers were immersed in etching solution A and soaked at 85°C for 90 minutes; the soaked carbon fibers were then dried.

[0044] Step 2: Roughen the surface of the aramid canvas.

[0045] Using a 30wt% H2PO4 acidic solution as etching solution B, the aramid canvas was immersed in the etching solution B and soaked at 30°C for 6 hours; the soaked aramid canvas was then dried.

[0046] Step 3: Prepare carbon fiber dispersion.

[0047] Weigh out 100 parts of 120# solvent oil, 0.7 parts of dispersant, and 5 parts of short-cut carbon fibers with a length of 5 mm. All three components are in parts by weight. Mix the three components together and stir mechanically for 1 hour to obtain a uniform carbon fiber dispersion. The dispersant used is Span 80.

[0048] Step 4: Prepare fluororubber compound.

[0049] According to the mass proportions shown in Table 2, fluororubber (FE2463), diatomaceous earth, fluorinated graphite, nano magnesium oxide, accelerator CZ, antioxidant RD, bisphenol AF, vulcanizing agent BPP, sodium stearate, 1-5 parts of triallyl cyanurate, and iron oxide red are added to a mixing equipment (mixing process parameters are: mixing temperature 90℃; mixing time 20 minutes; mixing speed 30 rpm), and mixed evenly to obtain fluororubber compound;

[0050] Step 5: Prepare aramid / fluororubber composite material.

[0051] First, weigh the fluororubber compound obtained in step 4, the carbon fiber dispersion obtained in step 3, and the mixed solvent and add them to a mixer. Stir for 2 hours to obtain fluororubber slurry. The mixed solvent is composed of methyl isobutyl ketone and butyl acetate in a mass ratio of 100:80. The mass ratio of the fluororubber compound, carbon fiber dispersion, and mixed solvent is 100:50:150.

[0052] Then, the obtained fluoropolymer mortar is applied to a surface with a mass of 550 g / m² using a scraper. 2 A 0.8mm thick aramid fiber cloth was dried to obtain an aramid / fluororubber composite material.

[0053] Step 6: Prepare a fluororubber-reinforced fabric V-shaped sealing ring.

[0054] First, the aramid / fluororubber composite material obtained in step 5 is pre-formed and then placed into a vulcanization mold. It is vulcanized at 175°C for 2 hours. After trimming the flash, a fluororubber-reinforced fabric V-shaped sealing ring is obtained.

[0055] Then, the fluororubber-reinforced fabric V-shaped sealing ring is combined with the support ring and the pressure ring according to the process requirements to obtain the fluororubber-reinforced fabric combined V-shaped sealing ring. The relevant performance parameters of the sample prepared in Example 1 are shown in Table 3.

[0056] Example 2

[0057] The steps for preparing carbon fiber reinforced fluororubber / aramid / fluororubber composite V-shaped sealing rings are as follows:

[0058] Step 1: Roughen the surface of the carbon fiber.

[0059] Using an acidic solution of 40wt% H2SO4 and 15wt% KClO3 of equal mass as etching solution A, carbon fibers were immersed in etching solution A and soaked at 95°C for 100 minutes; the soaked carbon fibers were then dried.

[0060] Step 2: Roughen the surface of the aramid canvas.

[0061] Using a 30wt% H2PO4 acidic solution as etching solution B, the aramid canvas was immersed in the etching solution B and soaked at 35°C for 6.5 hours; the soaked aramid canvas was then dried.

[0062] Step 3: Prepare carbon fiber dispersion.

[0063] Weigh out 100 parts of 120# solvent oil, 0.7 parts of dispersant, and 5 parts of short-cut carbon fibers with a length of 5 mm. All three components are in parts by weight. Mix the three components together and mechanically stir for 2 hours to obtain a uniform carbon fiber dispersion. The dispersant used is sorbitan oleate.

[0064] Step 4: Prepare fluororubber compound.

[0065] According to the mass proportions shown in Table 2, fluororubber (FE2463), diatomaceous earth, fluorinated graphite, nano magnesium oxide, accelerator CZ, antioxidant RD, bisphenol AF, vulcanizing agent BPP, sodium stearate, 1-5 parts of triallyl cyanurate, and iron oxide red are added to a mixing equipment (mixing process parameters are: mixing temperature 120℃; mixing time 30 minutes; mixing speed 50 rpm), and mixed evenly to obtain fluororubber compound;

[0066] Step 5: Prepare aramid / fluororubber composite material.

[0067] First, weigh the fluororubber compound obtained in step 4, the carbon fiber dispersion obtained in step 3, and the mixed solvent and add them to a mixer. Stir for 3 hours to obtain fluororubber slurry. The mixed solvent is composed of methyl isobutyl ketone and butyl acetate in a mass ratio of 120:70. The mass ratio of the fluororubber compound, carbon fiber dispersion, and mixed solvent is 100:100:180.

[0068] Then, the obtained fluoropolymer mortar is applied to a surface with a unit area mass of 580 g / m² using a scraper. 2 A 0.84mm thick aramid fiber cloth was dried to obtain an aramid / fluororubber composite material.

[0069] Step 6: Prepare a fluororubber-reinforced fabric V-shaped sealing ring.

[0070] First, the aramid / fluororubber composite material obtained in step 5 is pre-formed and then placed into a vulcanization mold. It is vulcanized at 185°C for 2.5 hours. After trimming the flash, a fluororubber-reinforced fabric V-shaped sealing ring is obtained.

[0071] Then, the fluororubber-reinforced fabric V-shaped sealing ring is combined with the support ring and the pressure ring according to the process requirements to obtain the fluororubber-reinforced fabric combined V-shaped sealing ring. The relevant performance parameters of the sample prepared in Example 2 are shown in Table 3.

[0072] Example 3

[0073] The steps for preparing carbon fiber reinforced fluororubber / aramid / fluororubber composite V-shaped sealing rings are as follows:

[0074] Step 1: Roughen the surface of the carbon fiber.

[0075] Using an acidic solution of 40wt% H2SO4 and 15wt% KClO3 of equal mass as etching solution A, carbon fibers were immersed in etching solution A and soaked at 100℃ for 120 minutes; the soaked carbon fibers were then dried.

[0076] Step 2: Roughen the surface of the aramid canvas.

[0077] Using a 30wt% H2PO4 acidic solution as etching solution B, the aramid canvas was immersed in the etching solution B and soaked at 30℃ for 7 hours; the soaked aramid canvas was then dried.

[0078] Step 3: Prepare carbon fiber dispersion.

[0079] Weigh out 100 parts of 120# solvent oil, 0.7 parts of dispersant, and 5 parts of short-cut carbon fibers with a length of 5 mm. All three components are in parts by weight. Mix the three components together and mechanically stir for 1.5 hours to obtain a uniform carbon fiber dispersion. The dispersant is a mixture of the same mass of Span 80 sorbitan oleate.

[0080] Step 4: Prepare fluororubber compound.

[0081] According to the mass proportions shown in Table 2, fluororubber (FE2463), diatomaceous earth, fluorinated graphite, nano magnesium oxide, accelerator CZ, antioxidant RD, bisphenol AF, vulcanizing agent BPP, sodium stearate, 1-5 parts of triallyl cyanurate, and iron oxide red are added to a mixing equipment (mixing process parameters are: mixing temperature 1000℃; mixing time 25 minutes; mixing speed 35 rpm), and mixed evenly to obtain fluororubber compound;

[0082] Step 5: Prepare aramid / fluororubber composite material.

[0083] First, weigh the fluororubber compound obtained in step 4, the carbon fiber dispersion obtained in step 3, and the mixed solvent and add them to a mixer. Stir for 4 hours to obtain fluororubber slurry. The mixed solvent is composed of methyl isobutyl ketone and butyl acetate in a mass ratio of 150:80. The mass ratio of the fluororubber compound, carbon fiber dispersion, and mixed solvent is 100:150:200.

[0084] Then, the obtained fluoropolymer mortar is applied to a surface with a mass of 600 g / m² using a trowel.2 A 0.83mm thick aramid fiber cloth was dried to obtain an aramid / fluororubber composite material.

[0085] Step 6: Prepare a fluororubber-reinforced fabric V-shaped sealing ring.

[0086] First, the aramid / fluororubber composite material obtained in step 5 is pre-formed and then placed into a vulcanization mold. It is vulcanized at 180°C for 3 hours. After trimming the flash, a fluororubber-reinforced fabric V-shaped sealing ring is obtained.

[0087] Then, the fluororubber-reinforced fabric V-shaped sealing ring is combined with the support ring and the pressure ring according to the process requirements to obtain the fluororubber-reinforced fabric combined V-shaped sealing ring. The relevant performance parameters of the sample prepared in Example 3 are shown in Table 3.

[0088] Example 4

[0089] The steps for preparing carbon fiber reinforced fluororubber / aramid / fluororubber composite V-shaped sealing rings are as follows:

[0090] Step 1: Roughen the surface of the carbon fiber.

[0091] Using an acidic solution of 40wt% H2SO4 and 15wt% KClO3 of equal mass as etching solution A, carbon fibers were immersed in etching solution A and soaked at 100℃ for 120 minutes; the soaked carbon fibers were then dried.

[0092] Step 2: Roughen the surface of the aramid canvas.

[0093] Using a 30wt% H2PO4 acidic solution as etching solution B, the aramid canvas was immersed in the etching solution B and soaked at 35°C for 6 hours; the soaked aramid canvas was then dried.

[0094] Step 3: Prepare carbon fiber dispersion.

[0095] Weigh out 100 parts of 120# solvent oil, 0.7 parts of dispersant, and 5 parts of short-cut carbon fibers with a length of 5 mm. All three components are in parts by weight. Mix the three components together and stir mechanically for 1.5 hours to obtain a uniform carbon fiber dispersion. The dispersant used is diisobutyl PEG / PPG-10 / 7 / dimethylsiloxane copolymer (FZ-2233).

[0096] Step 4: Prepare fluororubber compound.

[0097] According to the mass proportions shown in Table 2, fluororubber (FE2463), diatomaceous earth, fluorinated graphite, nano magnesium oxide, accelerator CZ, antioxidant RD, bisphenol AF, vulcanizing agent BPP, sodium stearate, 1-5 parts of triallyl cyanurate, and iron oxide red are added to a mixing equipment (mixing process parameters: mixing temperature 110℃; mixing time 28 minutes; mixing speed 40 rpm), and mixed evenly to obtain fluororubber compound;

[0098] Step 5: Prepare aramid / fluororubber composite material.

[0099] First, weigh the fluororubber compound obtained in step 4, the carbon fiber dispersion obtained in step 3, and the mixed solvent and add them to a mixer. Stir for 3 hours to obtain fluororubber slurry. The mixed solvent is composed of methyl isobutyl ketone and butyl acetate in a mass ratio of 150:50. The mass ratio of the fluororubber compound, carbon fiber dispersion, and mixed solvent is 100:200:150.

[0100] Then, the obtained fluoropolymer mortar is applied to a surface with a unit area mass of 560 g / m² using a scraper. 2 A 0.81mm thick aramid fiber cloth was dried to obtain an aramid / fluororubber composite material.

[0101] Step 6: Prepare a fluororubber-reinforced fabric V-shaped sealing ring.

[0102] First, the aramid / fluororubber composite material obtained in step 5 is pre-formed and then placed into a vulcanization mold. It is vulcanized at 170°C for 3 hours. After trimming the flash, a fluororubber-reinforced fabric V-shaped sealing ring is obtained.

[0103] Then, the fluororubber-reinforced fabric V-shaped sealing ring is combined with the support ring and the pressure ring according to the process requirements to obtain the fluororubber-reinforced fabric combined V-shaped sealing ring. The relevant performance parameters of the sample prepared in Example 4 are shown in Table 3.

[0104] In step 4 of the above Examples 1, 2, 3, and 4, the mass fractions of each component in the preparation of the fluororubber compound are shown in Table 2 below.

[0105] 2. Performance Testing

[0106] The performance of the fluororubber-insulated fabric V-shaped sealing rings prepared in Examples 1-4 was tested, including the following performance test items:

[0107] 1) Shore hardness: According to GB / T 2411-2008;

[0108] 2) Tensile strength: According to GB / T 1040.2-2006;

[0109] 3) Compressive strength: in accordance with GB / T 1041-2008;

[0110] 4) Wear loss: in accordance with GB / T 5478-2008;

[0111] 5) Acid resistance / volume change rate: According to HG / T2181-2009 (20% hydrochloric acid, 23℃×6 days).

[0112] The test results are shown in Table 3 below.

[0113] Table 2. Main components and content (parts by mass) of fluororubber adhesive.

[0114]

[0115] Table 3. Performance Test Results

[0116]

[0117] As shown in Table 3, increasing the amount of diatomaceous earth and fluorinated carbon black significantly improves the hardness and compressive strength of the sealing ring. Increasing the amount of carbon fiber significantly affects tensile strength and wear resistance. The sealing ring with the best performance is obtained when a fluorinated carbon black and diatomaceous earth mixture (mass ratio 2:1) is used as the mixed filler and the carbon fiber content is 7.5%. The fluororubber-reinforced fabric V-shaped sealing ring prepared by the method of this invention has high strength, good wear resistance and corrosion resistance, and excellent thermal conductivity, allowing for long-term use in high-temperature, high-pressure, highly corrosive, and particulate-containing environments.

Claims

1. A method for preparing a carbon fiber reinforced wear-resistant fluororubber-insulated V-shaped sealing ring, characterized in that, Follow these steps: Step 1: Roughen the surface of the carbon fiber. The specific process is as follows: Equal volumes of 40wt%H2SO4 and 15wt%KClO3 are mixed evenly to form etching solution A. The carbon fiber is then immersed in etching solution A and soaked at 85-100℃ for 90-120 minutes. The soaked carbon fiber is then dried. Step 2: Roughen the surface of the aramid canvas. The specific process is as follows: Using a 30wt% H2PO4 acidic solution as etching solution B, aramid canvas was immersed in etching solution B and soaked at 30-35℃ for 6-7 hours. The soaked aramid canvas was then dried. Step 3: Prepare carbon fiber dispersion. The specific process is as follows: Weigh out 100 parts of 120# solvent oil, 0.7 parts of dispersant, and 5 parts of short-cut carbon fibers with a length of 5 mm according to the mass ratio. Mix the three components together and mechanically stir for 1 to 2 hours to obtain a uniform carbon fiber dispersion. Step 4: Prepare fluororubber compound. The specific process is as follows: By weight, 100 parts of fluororubber, 10-30 parts of diatomaceous earth, 10-20 parts of fluorinated graphite, 2-4 parts of nano magnesium oxide, 0.5-1.5 parts of accelerator CZ, 0.5-1.5 parts of antioxidant RD, 1-3 parts of bisphenol AF, 0.5-1.5 parts of vulcanizing agent BPP, 1-5 parts of sodium stearate, 1-5 parts of triallyl cyanurate, and 1-3 parts of iron oxide red are added to a mixing device and mixed evenly to obtain fluororubber compound. The mixing process parameters are: mixing temperature 90℃-120℃; mixing time 20-30 minutes; mixing speed 30-50 rpm. Step 5: Prepare aramid / fluororubber composite material. The specific process is as follows: First, methyl isobutyl ketone and butyl acetate are mixed evenly at a mass ratio of 100-150:50-100 to obtain a mixed solvent; then, the fluororubber compound obtained in step 4, the carbon fiber dispersion obtained in step 3, and the mixed solvent are weighed and added to a mixer, and stirred for 2-4 hours to obtain a fluororubber slurry; the mass ratio of the fluororubber compound, the carbon fiber dispersion, and the mixed solvent is 100:50-200:150-200. Then, the obtained fluoropolymer paste is applied onto aramid fiber cloth using a scraper. The aramid fiber cloth selected has a unit area mass of 550~600g / m². 2 Aramid / fluororubber composite material with a thickness of 0.62~0.65mm is obtained after drying, and the thickness is 0.8~0.85mm. Step 6: Prepare the fluororubber-reinforced fabric V-shaped sealing ring. The specific process is as follows: First, the aramid / fluororubber composite material obtained in step 5 is pre-formed and then placed into a vulcanization mold. It is vulcanized at 165-185℃ for 2-3 hours. After trimming the flash, a fluororubber-reinforced fabric V-shaped sealing ring is obtained. Then, the fluororubber-reinforced fabric V-shaped sealing ring is combined with the corresponding support ring and pressure ring according to the process requirements to obtain the fluororubber-reinforced fabric combined V-shaped sealing ring.

2. The method for preparing the carbon fiber reinforced wear-resistant fluororubber-insulated V-shaped sealing ring according to claim 1, characterized in that, In step 3, the dispersant is selected from one or two of Span 80, sorbitan olive oil ester, and diisobutyl PEG / PPG-10 / 7 / dimethylsiloxane copolymer.

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