A high temperature resistant ultra-clean perfluoroether rubber and preparation method thereof

Abstract

The invention discloses a high-temperature resistant ultra-clean perfluoroether rubber and a preparation method thereof. The rubber body comprises a rubber body, a cleaning shell is sleeved on the outer side of the rubber body, a cleaning soft brush in contact with the rubber body is fixedly installed on the inner side of the cleaning shell, and a groove is provided on the surface of the cleaning shell. The rubber of the invention is composed of FRSI, FRCI, RCC and a vulcanized body. FRSI is a white flexible fabric that can provide protection at a temperature as high as 371°C. FRCI is composed of high-purity silica fibers. FRCI improves the durability of the rubber body and the crack resistance of the coating, and also reduces the weight. The RCC material is a thermoplastic elastomer TPE material, and the RCC material is filled with white AB312 fibers or black AB312 containing alumina fibers. The vulcanized body is composed of a main chain (TFE), a side chain (PMVE) and a bridging part, so that the rubber body can achieve good high-temperature resistance while reducing the use of heat-resistant materials, so that it is convenient for use on aerospace equipment and improves its flexibility of use.

Description

Technical Field

[0001] The invention relates to the technical field of perfluoroether rubber, in particular to a high temperature resistant ultra-clean perfluoroether rubber and a preparation method thereof. Background Art

[0002] Perfluoroether rubber is a type of fluororubber and a synthetic elastomer with the following characteristics: First, high temperature adaptability: compared with general fluororubber, its high temperature resistance is better than that of fluororubber, and it also has better low temperature resistance; Second, mechanical properties: due to the -OCFg group in the side chain, the crystallinity of polytetrafluoroethylene is structurally destroyed, and it has good elasticity. By adjusting different raw rubber varieties, fillers, vulcanizers, etc., rubbers with different hardness, tensile strength and other properties can be produced; Third, resistance to solvents and chemicals: due to the high amount of CF bonds contained in perfluoroether rubber, it determines its excellent resistance to solvents and chemicals. At the same time, perfluoroether rubber is resistant to chemicals that other rubbers cannot use, such as THF, dichloromethane, etc. In addition to the above properties, perfluoroether rubber has other advantages, such as good insulation, a wide range of operating temperatures, etc.

[0003] Perfluoroether seals perform better than No. 1 fluororubber. At 240°C, perfluoroether seals are more resistant to high temperatures than fluororubber seals and other products. The rate of deformation increases rapidly over time. The compression set of perfluoroether seals is always less than 50%. Perfluoroether seals also maintain the elastic properties of rubber at 300°C. The chemical corrosion resistance of perfluoroether seals is better than that of fluororubber seals. In environments such as ether, metal amides, ketones, oxidants, organic solvents, fuels, acids, and alkalis, perfluoroether seals have good stability and good tolerance to almost all chemicals. Perfluoroether seals can resist 1,600 chemicals. The volume of the perfluoroether O-ring did not change much after being immersed in toluene, acetone, and dichloromethane for 6 months, while the other rubbers were severely deformed.

[0004] The surface cracking of perfluoroether sealing rings is caused by vulcanization or post-vulcanization. Too much filler and too little oil in the product formula are the main causes of cracking before vulcanization. The cracking is caused by product pressure or failure to purchase sealing solvents. Perfluoroether rubber sealing rings are the best rubber materials among all rubber sealing rings. They are resistant to organic acids, alkalis, alcohols, ketones, ethers, nitrides, hydrocarbons, halogenated hydrogen, furans, aldehydes, oils and water vapor and nearly 2,000 chemical media. At the maximum temperature of 325°C, fluororubber has excellent flame retardancy, air tightness, high temperature resistance, oil resistance, solvent resistance, fire resistance, chemical resistance and weather resistance. They are commonly used in the automotive industry, chemical processes, aerospace and many tasks.

[0005] However, traditional perfluoroether rubber has the following disadvantages:

[0006] Traditional perfluoroether rubber has average high temperature resistance, which means that perfluoroether rubber cannot be used in some special high temperature environments, such as aerospace equipment, shortening its scope of use. Summary of the invention

[0007] The purpose of the present invention is to provide a high-temperature resistant ultra-clean perfluoroether rubber and a preparation method to solve the problem that the traditional perfluoroether rubber mentioned in the above background technology has a general high-temperature resistance effect, which leads to the perfluoroether rubber being unable to be used in some special high-temperature environments, such as aerospace equipment, thus shortening its scope of use.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-temperature resistant ultra-clean perfluoroether rubber, comprising a rubber body, a cleaning shell is sleeved on the outer side of the rubber body, a cleaning soft brush in contact with the rubber body is fixedly installed on the inner side of the cleaning shell, a groove is provided on the surface of the cleaning shell, the rubber body comprises a protective pad, a high-temperature insulation pad, a low-temperature insulation pad and a sealing pad, the outer side of the sealing pad is fixedly connected to the inner side of the low-temperature insulation pad, the outer side of the low-temperature insulation pad is fixedly connected to the inner side of the high-temperature insulation pad, and the outer side of the high-temperature insulation pad is fixedly connected to the inner side of the protective pad.

[0009] As a preferred technical solution of the present invention, the protection pad is made of FRSI material, which is a white flexible fabric that can provide protection at temperatures as high as 371°C.

[0010] As a preferred technical solution of the present invention, the high-temperature insulation pad is made of FRCI material, and the FRCI is composed of high-purity silica fibers. FRCI improves the durability of the rubber body and the crack resistance of the coating, and also reduces the weight.

[0011] As a preferred technical solution of the present invention, the low-temperature insulation pad is made of RCC material, which is a thermoplastic elastomer (TPE) material, and the RCC material is filled with white AB312 fiber or black AB312 containing alumina fiber.

[0012] As a preferred technical solution of the present invention, the sealing gasket is made of a vulcanized material, and the vulcanized body is composed of a main chain (TFE), a side chain (PMVE) and a bridging part.

[0013] The present invention provides a method for preparing a high temperature resistant ultra-clean perfluoroether rubber, comprising the following steps:

[0014] Step 1, mixing ingredients: select 60-70 parts of perfluoroether rubber, 1-5 parts of reinforcing filler, 1-5 parts of semi-reinforcing carbon black, 1-5 parts of TAIC, 1-5 parts of vulcanizing agent, 5-10 parts of FRSI, 10-15 parts of FRCI and 10-15 parts of RCC;

[0015] Step 2: Rubber mixing preparation: start the rubber mixing machine and open the cooling water valve;

[0016] Step 3, rubber mixing: adjust the rubber mixer roller distance to about 1mm, wrap the perfluoroether raw rubber on the front roller after 3 times, and after the perfluoroether raw rubber is evenly wrapped on the rubber mixer, slowly add reinforcing filler, semi-reinforcing carbon black, TAIC, vulcanizing agent, FRSI, FRCI and RCC10 in batches along the rubber mixer roller gap. If there is too much accumulated rubber, gradually and slowly increase the roller distance; clean the rubber mixer material tray and add the cleaned materials to the rubber; after the powder is eaten, pull the cutter left and right once, adjust the roller distance to about 3.5mm, and discharge the sheet;

[0017] Step 4: Natural cooling: After mixing, the rubber compound is spread out and allowed to air naturally to room temperature before being put into storage. The rubber compound cannot be piled up to prevent temperature accumulation in the middle of the rubber compound, which may cause scorching.

[0018] As a preferred technical solution of the present invention, the rubber mixer in step 2 must be cleaned before mixing.

[0019] As a preferred technical solution of the present invention, the cooling water valve in step 2 is specifically opened to half of the cooling water valve.

[0020] As a preferred technical solution of the present invention, the temperature of the roller in step 3 should not exceed 50° C. If the temperature is too high during the mixing process, wait until the roller is slightly cooled before operating.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The rubber is composed of FRSI, FRCI, RCC and vulcanized body. FRSI is a white flexible fabric that can provide protection at temperatures up to 371°C. FRCI is composed of high-purity silica fibers. FRCI improves the durability of the rubber body and the crack resistance of the coating, and also reduces the weight. RCC material is a thermoplastic elastomer TPE material, and the RCC material is filled with white AB312 fiber or black AB312 containing alumina fiber. The vulcanized body is composed of a main chain (TFE), a side chain (PMVE) and a bridging part, so that the rubber body can achieve good high temperature resistance while reducing the use of heat-resistant materials, which is convenient for its use on aerospace equipment and improves its flexibility of use.

[0023] 2. By setting a cleaning shell, the cleaning shell slides along the rubber body, and the cleaning soft brush cleans the impurities adhered to the surface of the rubber body, thereby ensuring the cleanliness of the rubber body itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a side view of the present invention;

[0025] Figure 2 is a side view of the rubber body of the present invention;

[0026] Figure 3 It is a flow chart of the present invention.

[0027] In the figure: 1. rubber body; 101. protection pad; 102. high temperature insulation pad; 103. low temperature insulation pad; 104. sealing pad; 2. cleaning shell; 3. groove; 4. cleaning soft brush. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-3 The present invention provides a high-temperature resistant ultra-clean perfluoroether rubber and a preparation method thereof, comprising a rubber body 1, a cleaning shell 2 is sleeved on the outer side of the rubber body 1, a cleaning soft brush 4 in contact with the rubber body 1 is fixedly installed on the inner side of the cleaning shell 2, a groove 3 is opened on the surface of the cleaning shell 2, the rubber body 1 comprises a protective pad 101, a high-temperature insulation pad 102, a low-temperature insulation pad 103 and a sealing pad 104, the outer side of the sealing pad 104 is fixedly connected to the inner side of the low-temperature insulation pad 103, the outer side of the low-temperature insulation pad 103 is fixedly connected to the inner side of the high-temperature insulation pad 102, the outer side of the high-temperature insulation pad 102 is fixedly connected to the inner side of the protective pad 101, the user holds the groove 3 by hand to make the cleaning shell 2 slide along the rubber body 1 to clean the impurities adhered to the surface of the rubber body 1.

[0030] The protective pad 101 is made of FRSI material, which is a white flexible fabric that can provide protection at temperatures up to 371°C.

[0031] The high temperature insulation pad 102 is made of FRCI material. FRCI is composed of high-purity silica fibers. FRCI improves the durability of the rubber body 1 and the crack resistance of the coating, and also reduces the weight.

[0032] The low-temperature insulation pad 103 is made of RCC material, which is a thermoplastic elastomer TPE material, and the RCC material is filled with white AB312 fiber or black AB312 containing alumina fiber.

[0033] The sealing gasket 104 is made of a vulcanized material, and the vulcanized material is composed of a main chain (TFE), a side chain (PMVE) and a bridge portion.

[0034] Embodiment 1:

[0035] The present invention provides a method for preparing a high temperature resistant ultra-clean perfluoroether rubber, comprising the following steps:

[0036] Step 1, mixing ingredients: select 60-70 parts of perfluoroether rubber, 1-5 parts of reinforcing filler, 1-5 parts of semi-reinforcing carbon black, 1-5 parts of TAIC, 1-5 parts of vulcanizing agent, 5-10 parts of FRSI, 10-15 parts of FRCI and 10-15 parts of RCC;

[0037] Step 2: Rubber mixing preparation: start the rubber mixing machine and open the cooling water valve;

[0038] Step 3, rubber mixing: adjust the rubber mixer roller distance to about 1mm, wrap the perfluoroether raw rubber on the front roller after 3 times, and after the perfluoroether raw rubber is evenly wrapped on the rubber mixer, slowly add reinforcing filler, semi-reinforcing carbon black, TAIC, vulcanizing agent, FRSI, FRCI and RCC10 in batches along the rubber mixer roller gap. If there is too much accumulated rubber, gradually and slowly increase the roller distance; clean the rubber mixer material tray and add the cleaned materials to the rubber; after the powder is eaten, pull the cutter left and right once, adjust the roller distance to about 3.5mm, and discharge the sheet;

[0039] Step 4: Natural cooling: After mixing, the rubber compound is spread out and allowed to air naturally to room temperature before being put into storage. The rubber compound cannot be piled up to prevent temperature accumulation in the middle of the rubber compound, which may cause scorching.

[0040] In step 2, the rubber mixer must be cleaned before mixing.

[0041] In step 2, the cooling water valve is opened to half.

[0042] In step 3, the roller temperature should not exceed 50°C. If the temperature is too high during mixing, wait until the roller cools down slightly before proceeding.

[0043] Embodiment 2:

[0044] Step 1: Mix ingredients: select 70 parts of perfluoroether rubber, 1 part of reinforcing filler, 1 part of semi-reinforcing carbon black, 1 part of TAIC, 2 parts of vulcanizing agent, 5 parts of FRSI, 10 parts of FRCI and 10 parts of RCC;

[0045] Step 2: Rubber mixing preparation: start the rubber mixing machine and open the cooling water valve;

[0046] Step 3, rubber mixing: adjust the rubber mixer roller distance to about 1mm, wrap the perfluoroether raw rubber on the front roller after 3 times, and after the perfluoroether raw rubber is evenly wrapped on the rubber mixer, slowly add reinforcing filler, semi-reinforcing carbon black, TAIC, vulcanizing agent, FRSI, FRCI and RCC10 in batches along the rubber mixer roller gap. If there is too much accumulated rubber, gradually and slowly increase the roller distance; clean the rubber mixer material tray and add the cleaned materials to the rubber; after the powder is eaten, pull the cutter left and right once, adjust the roller distance to about 3.5mm, and discharge the sheet;

[0047] Step 4: Natural cooling: After mixing, the rubber compound is spread out and allowed to air naturally to room temperature before being put into storage. The rubber compound cannot be piled up to prevent temperature accumulation in the middle of the rubber compound, which may cause scorching.

[0048] In step 2, the rubber mixer must be cleaned before mixing.

[0049] In step 2, the cooling water valve is opened to half.

[0050] In step 3, the drum temperature should not exceed 50°C. If the temperature is too high during mixing, wait until the drum cools down slightly before operating.

[0051] Embodiment 3:

[0052] Step 1: Mix ingredients: select 68 parts of perfluoroether rubber, 1 part of reinforcing filler, 2 parts of semi-reinforcing carbon black, 2 parts of TAIC, 2 parts of vulcanizing agent, 5 parts of FRSI, 10 parts of FRCI and 10 parts of RCC;

[0053] Step 2: Rubber mixing preparation: start the rubber mixing machine and open the cooling water valve;

[0054] Step 3, rubber mixing: adjust the rubber mixer roller distance to about 1mm, wrap the perfluoroether raw rubber on the front roller after 3 times, and after the perfluoroether raw rubber is evenly wrapped on the rubber mixer, slowly add reinforcing filler, semi-reinforcing carbon black, TAIC, vulcanizing agent, FRSI, FRCI and RCC10 in batches along the rubber mixer roller gap. If there is too much accumulated rubber, gradually and slowly increase the roller distance; clean the rubber mixer material tray and add the cleaned materials to the rubber; after the powder is eaten, pull the cutter left and right once, adjust the roller distance to about 3.5mm, and discharge the sheet;

[0055] Step 4: Natural cooling: After mixing, the rubber compound is spread out and allowed to air naturally to room temperature before being put into storage. The rubber compound cannot be piled up to prevent temperature accumulation in the middle of the rubber compound, which may cause scorching.

[0056] In step 2, the rubber mixer must be cleaned before mixing.

[0057] In step 2, the cooling water valve is opened to half.

[0058] In step 3, the drum temperature should not exceed 50°C. If the temperature is too high during mixing, wait until the drum cools down slightly before operating.

[0059] Embodiment 4:

[0060] Step 1: Mix ingredients: select 69 parts of perfluoroether rubber, 1 part of reinforcing filler, 1 part of semi-reinforcing carbon black, 1 part of TAIC, 1 part of vulcanizing agent, 5 parts of FRSI, 10 parts of FRCI and 12 parts of RCC;

[0061] Step 2: Rubber mixing preparation: start the rubber mixing machine and open the cooling water valve;

[0062] Step 3, rubber mixing: adjust the rubber mixer roller distance to about 1mm, wrap the perfluoroether raw rubber on the front roller after 3 times, and after the perfluoroether raw rubber is evenly wrapped on the rubber mixer, slowly add reinforcing filler, semi-reinforcing carbon black, TAIC, vulcanizing agent, FRSI, FRCI and RCC10 in batches along the rubber mixer roller gap. If there is too much accumulated rubber, gradually and slowly increase the roller distance; clean the rubber mixer material tray and add the cleaned materials to the rubber; after the powder is eaten, pull the cutter left and right once, adjust the roller distance to about 3.5mm, and discharge the sheet;

[0063] Step 4: Natural cooling: After mixing, the rubber compound is spread out and allowed to air naturally to room temperature before being put into storage. The rubber compound cannot be piled up to prevent temperature accumulation in the middle of the rubber compound, which may cause scorching.

[0064] In step 2, the rubber mixer must be cleaned before mixing.

[0065] In step 2, the cooling water valve is opened to half.

[0066] In step 3, the drum temperature should not exceed 50°C. If the temperature is too high during mixing, wait until the drum cools down slightly before operating.

[0067] Embodiment 5:

[0068] Step 1: Mix ingredients: select 67 parts of perfluoroether rubber, 2 parts of reinforcing filler, 1 part of semi-reinforcing carbon black, 2 parts of TAIC, 1 part of vulcanizing agent, 5 parts of FRSI, 11 parts of FRCI and 11 parts of RCC;

[0069] Step 2: Rubber mixing preparation: start the rubber mixing machine and open the cooling water valve;

[0070] Step 3, rubber mixing: adjust the rubber mixer roller distance to about 1mm, wrap the perfluoroether raw rubber on the front roller after 3 times, and after the perfluoroether raw rubber is evenly wrapped on the rubber mixer, slowly add reinforcing filler, semi-reinforcing carbon black, TAIC, vulcanizing agent, FRSI, FRCI and RCC10 in batches along the rubber mixer roller gap. If there is too much accumulated rubber, gradually and slowly increase the roller distance; clean the rubber mixer material tray and add the cleaned materials to the rubber; after the powder is eaten, pull the cutter left and right once, adjust the roller distance to about 3.5mm, and discharge the sheet;

[0071] Step 4: Natural cooling: After mixing, the rubber compound is spread out and allowed to air naturally to room temperature before being put into storage. The rubber compound cannot be piled up to prevent temperature accumulation in the middle of the rubber compound, which may cause scorching.

[0072] In step 2, the rubber mixer must be cleaned before mixing.

[0073] In step 2, the cooling water valve is opened to half.

[0074] In step 3, the drum temperature should not exceed 50°C. If the temperature is too high during mixing, wait until the drum cools down slightly before operating.

[0075] In the present invention, the rubber making personnel selects 60-70 parts of perfluoroether rubber, 1-5 parts of reinforcing filler, 1-5 parts of semi-reinforcing carbon black, 1-5 parts of TAIC, 1-5 parts of vulcanizing agent, 5-10 parts of FRSI, 10-15 parts of FRCI and 10-15 parts of RCC, and the rubber making personnel starts the rubber mixing machine, opens the cooling water valve, and adjusts the roller distance of the rubber mixing machine to about 1mm, and wraps the front roller with the perfluoroether rubber in 3 times, and after the perfluoroether rubber is evenly wrapped on the rubber mixing machine, Slowly add reinforcing filler, semi-reinforcing carbon black, TAIC, vulcanizer, FRSI, FRCI and RCC10 in batches along the roller gap of the rubber mixer. If there is too much accumulated rubber, gradually and slowly increase the roller gap; clean the material tray of the rubber mixer and add the cleaned material to the rubber; after the powder is eaten, pull the cutting knife left and right once, adjust the roller gap to about 3.5mm, and unload the material. The rubber maker will spread the mixed rubber and let it dry naturally to room temperature before putting it into storage. The rubber cannot be stacked to prevent temperature accumulation in the middle of the rubber and cause scorching.

[0076] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high temperature resistant ultra-clean perfluoroether rubber, comprising a rubber body (1), characterized in that: The outer side of the rubber body (1) is sleeved with a cleaning shell (2), the inner side of the cleaning shell (2) is fixedly mounted with a cleaning soft brush (4) in contact with the rubber body (1), the surface of the cleaning shell (2) is provided with a groove (3), the rubber body (1) comprises a protection pad (101), a high-temperature insulation pad (102), a low-temperature insulation pad (103) and a sealing pad (104), the outer side of the sealing pad (104) is fixedly connected to the inner side of the low-temperature insulation pad (103), the outer side of the low-temperature insulation pad (103) is fixedly connected to the inner side of the high-temperature insulation pad (102), the outer side of the high-temperature insulation pad (102) is fixedly connected to the inner side of the protection pad (101), the protection pad (101) is made of FRSI material, the high-temperature insulation pad (102) is made of FRCI material, the low-temperature insulation pad (103) is made of RCC material, and the sealing pad (104) is made of sulfide material.

2. The high temperature resistant ultra-clean perfluoroether rubber according to claim 1, characterized in that: The FRSI is a white, flexible fabric that provides protection in temperatures up to 371°C.

3. The high temperature resistant ultra-clean perfluoroether rubber according to claim 1, characterized in that: The FRCI is composed of high-purity silica fibers, which improves the durability of the rubber body (1) and the crack resistance of the coating, and also reduces the weight.

4. The high temperature resistant ultra-clean perfluoroether rubber according to claim 1, characterized in that: The RCC material is a thermoplastic elastomer TPE material, and the RCC material is filled with white AB312 fibers or black AB312 containing alumina fibers.

5. The high temperature resistant ultra-clean perfluoroether rubber according to claim 1, characterized in that: The vulcanized body is composed of a main chain TFE, a side chain PMVE and a bridging part.

6. A method for preparing a high temperature resistant ultra-clean perfluoroether rubber according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1, mixing ingredients: select 60-70 parts of perfluoroether rubber, 1-5 parts of reinforcing filler, 1-5 parts of semi-reinforcing carbon black, 1-5 parts of TAIC, 1-5 parts of vulcanizing agent, 5-10 parts of FRSI, 10-15 parts of FRCI and 10-15 parts of RCC; Step 2: Rubber mixing preparation: start the rubber mixing machine and open the cooling water valve; Step 3, rubber mixing: adjust the rubber mixing machine roller distance to about 1mm, wrap the front roller with the perfluoroether raw rubber three times, and after the perfluoroether raw rubber is evenly wrapped on the rubber mixing machine, slowly add reinforcing filler, semi-reinforcing carbon black, TAIC, vulcanizing agent, FRSI, FRCI and RCC in batches along the rubber mixing machine roller gap. If there is too much accumulated rubber, gradually and slowly increase the roller distance; clean the rubber mixing machine material tray and add the cleaned materials to the rubber; after the powder is eaten, pull the cutter left and right once, adjust the roller distance to about 3.5mm, and discharge the sheet; Step 4: Natural cooling: After mixing, the rubber compound is spread out and allowed to air naturally to room temperature before being put into storage. The rubber compound cannot be piled up to prevent the temperature from accumulating in the middle of the rubber compound and causing scorching.

7. The method for preparing a high temperature resistant ultra-clean perfluoroether rubber according to claim 6, characterized in that: In the step 2, the rubber mixer must be cleaned before mixing.

8. The method for preparing a high temperature resistant ultra-clean perfluoroether rubber according to claim 6, characterized in that: In the step 2, the cooling water valve is specifically opened to half.

9. The method for preparing a high temperature resistant ultra-clean perfluoroether rubber according to claim 6, characterized in that: In step 3, the roller temperature should not exceed 50° C. If the temperature is too high during the mixing process, wait until the roller cools down slightly before proceeding.

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