Sealing rubber assembly, preparation method thereof and hose connector sealing structure

Abstract

The invention belongs to the technical field of hose sealing in the nuclear power field, and particularly relates to a sealing rubber assembly, a preparation method of the sealing rubber assembly and a hose connector sealing structure. 50 parts of nitrile rubber NBR; 10 parts of liquid butyronitrile latex; 5 parts of zinc oxide; 1 part of stearic acid; 2 parts of magnesium oxide; 2 parts of a flowing exhaust agent SC617; 5 parts of phenolic resin HM601; 1.5 parts of an anti-aging agent RD; 1 part of an anti-aging agent 4020; 60 parts of carbon black N660; 6 parts of aromatic oil; 4 parts of a plasticizer dioctyl phthalate (DOP); 1.0 part of sulfur; 0.8 part of an accelerant CBS; 0.8 part of an accelerant DM; the preparation method comprises the following steps: step 1, plastifying BIIR and NBR: plastifying by adopting an internal mixer, and carrying out thin-passing by adopting an open mill to obtain plastified rubber; and step 2, a mixing process: carrying out first-stage mixing and second-stage mixing by adopting an internal mixer to obtain the sealing rubber assembly. The sealing rubber assembly disclosed by the invention has excellent sealing, gas insulation, liquid oil resistance and liquid resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of hose sealing in the nuclear power field, and in particular relates to a sealing rubber component and a preparation method thereof, and a hose joint sealing structure. Background Art

[0002] Qinshan Nuclear Power Plant hoses are used in a large number of system equipment in 146 working conditions, with a wide variety of types and complex working conditions. At the same time, according to the requirements of the preventive maintenance outline, the replacement of spare parts is very large. However, the above-mentioned large number of hoses are imported (EU), and they urgently need to be domestically developed. The development, testing and evaluation of a series of accessories such as metal hoses and connectors are completed; the development, testing and evaluation of a series of accessories such as non-metallic hoses and connectors are completed; and finally the product manufacturing performance test is passed to meet the requirements to realize the localization of hoses.

[0003] Therefore, it is urgent to realize the localization of hoses and hose connectors. Summary of the invention

[0004] The object of the present invention is to provide a sealing rubber component and a preparation method thereof and a hose joint sealing structure, wherein the sealing rubber component has excellent sealing and air-tightness performance, excellent resistance to liquid oil and liquid, and has the advantages of good elasticity, small compression permanent deformation and long service life.

[0005] The technical solution to achieve the purpose of the present invention is:

[0006] A sealing rubber component, wherein the components of the sealing rubber component are, in parts by weight:

[0007] Bromobutyl rubber BIIR, 50 parts; nitrile rubber NBR, 50 parts; liquid nitrile latex, 10 parts; zinc oxide, 5 parts; stearic acid, 1 part; magnesium oxide, 2 parts; flow degassing agent SC617, 2 parts; phenolic resin HM601, 5 parts; antioxidant RD, 1.5 parts; antioxidant 4020, 1 part; carbon black N660, 60 parts; aromatic oil, 6 parts; plasticizer dioctyl ester DOP, 4 parts; sulfur, 1.0 parts; accelerator CBS, 0.8 parts; accelerator DM, 0.8 parts.

[0008] A method for preparing a sealing rubber, the method comprising:

[0009] Step 1, plasticizing BIIR and NBR: plasticizing with an internal mixer and thinning with an open mixer to obtain plasticized rubber;

[0010] Step 2, mixing process: using an internal mixer to perform first-stage mixing and second-stage mixing to obtain a sealing rubber component.

[0011] The step 1 comprises:

[0012] Step 1.1, heating the internal mixer to a temperature above the discharge temperature, adding BIIR, NBR and liquid nitrile latex, controlling the speed of the internal mixer, and performing discharge after the temperature of the internal mixer rises to the discharge temperature to obtain a premixed mixed rubber;

[0013] Step 1.2, adjust the temperature of the front and rear rollers of the mixing mill to the plasticizing temperature, and reduce the distance between the front and rear rollers; add the mixed rubber premixed by the internal mixer, plasticate on the mixing mill, and pass the rollers; then increase the distance between the front and rear rollers, tamp the rubber with a rubber turning machine, perform the five-pack three-roll process, and then place the sheet down to obtain the plasticized rubber.

[0014] In the step 1.1, the debinding temperature is 130-140° C., and the rotating speed of the internal mixer is 28 r / min.

[0015] In the step 1.2, the plasticizing temperature is 45-55°C, the distance between the front and rear rollers is adjusted to less than 2 mm, and the rollers are passed 2-3 times; the distance between the front and rear rollers is adjusted to more than 5 mm, the rubber turning machine is used to tamp the rubber 10-12 times, and the lower sheet is parked for 24 hours.

[0016] The first stage mixing in step 2 comprises:

[0017] Step 2.1.1, adjust the speed of the internal mixer, raise the top bolt, add the plasticized rubber, zinc oxide, stearic acid, magnesium oxide, antioxidant, phenolic resin, and flow degassing agent SC617 that have been plasticated and parked in the internal mixer and the open mixer, and perform internal mixing;

[0018] Step 2.1.2, add half of carbon black for internal mixing;

[0019] Step 2.1.3, add the remaining carbon black and all the plasticizers dioctyl ester and aromatic oil, perform internal mixing, discharge the rubber, remove the sheets, cool, and stand to obtain a mixed rubber compound.

[0020] In step 2.1.1, the mixer speed is 28 r / min, and the mixing time is 2 to 3 minutes; in step 2.1.2, the mixing time is 2 to 3 minutes; in step 2.1.3, the mixing time is 4 to 5 minutes, and the cooling parking time is 12 hours; the temperature of steps 2.1.1 to 2.1.3 is controlled not to exceed 120°C throughout the process.

[0021] The two-stage mixing in step 2 includes:

[0022] Step 2.2.1, adjusting the speed of the internal mixer, adding a first-stage mixed rubber material, sulfur, and accelerator, and performing internal mixing and rubber removal;

[0023] Step 2.2.2, after the five-pack-three-roll process on the mixing mill, the sheet is removed for cooling and parking to obtain a sealing rubber component.

[0024] In the step 2.2.1, the speed of the internal mixer is 25 r / min, the internal mixing time is 1 to 1.5 minutes, and the debinding temperature does not exceed 90° C.; in the step 2.2.2, the thickness of the lower sheet is 5 mm.

[0025] A hose joint sealing structure comprises a sleeve, a sealing rubber component and a joint assembly core rod. A sealing groove is provided at the tail of the joint assembly core rod, the sealing groove matches the sealing rubber component, the sealing rubber component is sleeved on the sealing groove, the sleeve is sleeved on the outer periphery of the joint assembly core rod, and the sleeve is buckled and pressed on the joint assembly core rod to deform the sealing rubber component at the tail of the joint assembly core rod, thereby improving the sealing performance of the tail of the joint assembly core rod.

[0026] The beneficial technical effects of the present invention are:

[0027] The rubber sealing component provided by the present invention not only has excellent sealing and air-tightening performance, but also has excellent liquid oil and liquid resistance, and also has the advantages of good elasticity, small compression permanent deformation and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a hose joint sealing structure provided by the present invention;

[0029] In the figure: 1. Sleeve; 2. Sealing rubber assembly; 3. Core rod of the joint assembly. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0031] The present invention provides a sealing rubber component, and the components of the sealing rubber component are, in parts by weight:

[0032] Bromobutyl rubber (BIIR), 50 parts; nitrile rubber (NBR), 50 parts; liquid nitrile latex, 10 parts; zinc oxide, 5 parts; stearic acid, 1 part; magnesium oxide, 2 parts; flow degassing agent SC617, 2 parts; phenolic resin HM601, 5 parts; antioxidant RD, 1.5 parts; antioxidant 4020, 1 part; carbon black N660, 60 parts; aromatic oil, 6 parts; plasticizer dioctyl ester (DOP), 4 parts; sulfur, 1.0 parts; accelerator CBS, 0.8 parts; accelerator DM, 0.8 parts.

[0033] The present invention provides a method for preparing a sealing rubber component, which specifically comprises the following steps:

[0034] Step 1, plasticization of BIIR and NBR, divided into two steps:

[0035] Step 1.1, use an internal mixer to plasticize to obtain a premixed mixed rubber

[0036] Heat the internal mixer to 150°C, add BIIR, NBR and liquid nitrile latex, control the speed of the internal mixer to 28r / min, and discharge the rubber when the temperature of the internal mixer rises to 130-140°C to obtain a premixed rubber.

[0037] Step 1.2, using an open mill to make a thin pass to obtain plasticized rubber

[0038] Adjust the temperature of the front and rear rollers of the open mill to 45-55℃, and reduce the distance between the front and rear rollers to less than 2mm. Add the mixed rubber premixed by the internal mixer, and plasticate it on the open mill, passing the rollers 2-3 times. Then increase the distance between the rollers by more than 5mm, use the rubber turning machine to tamp the rubber 10-12 times, and after the five-pack three-roll process is implemented, the lower sheet is parked for 24 hours to obtain the plasticized rubber, which enters the next process.

[0039] Step 2, mixing process, divided into two stages:

[0040] Step 2.1, use an internal mixer to mix the rubber material for a period of time to obtain a mixed rubber material.

[0041] Step 2.1.1, adjust the speed of the internal mixer to 28r / min, raise the top bolt, add the plasticized rubber, zinc oxide, stearic acid, magnesium oxide, antioxidant, phenolic resin, flow degassing agent SC617 and other materials that have been plasticized and parked in the internal mixer and open mixer, and mix for 2 to 3 minutes.

[0042] Step 2.1.2, add half of the carbon black and knead for 2 to 3 minutes.

[0043] Step 2.1.3, add the remaining carbon black and all the plasticizers, dioctyl ester DOP and aromatic oil, mix for 4-5 minutes, discharge the rubber, remove the sheet, cool, and stand for 12 hours to obtain a mixed rubber material for the next process. The temperature is controlled not to exceed 120℃ throughout the process.

[0044] Step 2.2, using an internal mixer for two-stage mixing to obtain a sealing rubber component

[0045] Step 2.2.1, adjust the speed of the internal mixer to 25r / min, add a first-stage mixed rubber material, sulfur, and accelerator, mix for 1 to 1.5 minutes, and discharge the rubber. The discharge temperature does not exceed 90°C.

[0046] Step 2.2.2, after the five-pack and three-roll process on the mixing mill, a sheet of about 5 mm is cooled and parked to obtain a sealing rubber component for standby use.

[0047] The relevant performance test results of the sealing rubber assembly provided by the present invention are as follows:

[0048] Vulcanization conditions: Flat plate vulcanization 160℃×3min

[0049] 1. Physical properties: hardness: 55; tensile strength: 12MPa; elongation at break: 450%; 100% tensile strength: 7MPa; permanent deformation at break: 8%, permanent deformation at compression: ≤25%; liquid resistance (3# standard oil 100℃×168h): +15, in line with national standards.

[0050] 2. Air permeability × 10 19 / (m 2 ·s -1 ·Pa -1 ): 2.41, which meets the requirements of national standards.

[0051] like Figure 1 As shown, a hose joint sealing structure provided by the present invention includes a sleeve 1, a sealing rubber component 2, and a joint component core rod 3. A sealing groove is provided at the tail of the joint component core rod 3, and the sealing groove matches the sealing rubber component 2. The sealing rubber component 2 is sleeved on the sealing groove, and the sleeve 1 is sleeved on the outer periphery of the joint component core rod 3. The sleeve 1 is pressed against the joint component core rod 3 to deform the sealing rubber component 2 at the tail of the joint component core rod 3, thereby increasing the sealing performance of the tail of the joint component core rod 3 and increasing the airtightness of the hose assembly.

[0052] The performance test of the hose assembly composed of the hose connector sealing structure and the hose of the present invention was carried out in accordance with GB / T7939-2008, and the results are as follows:

[0053] 1. Pressure test: 2 times the working pressure of the pipe body, maintain pressure for 60s.

[0054] 2. Burst test: 4 times the working pressure of the pipe body.

[0055] 3. Pulse test: test medium temperature 100℃±3℃, pipe working pressure 1.33 times.

[0056] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. A sealing rubber component, characterized in that: In parts by weight, the components of the sealing rubber component are: Bromobutyl rubber BIIR, 50 parts; Nitrile rubber NBR, 50 parts; Liquid nitrile latex, 10 parts; Zinc oxide, 5 parts; stearic acid, 1 part; magnesium oxide, 2 parts; flow degassing agent SC617, 2 parts; phenolic resin HM601, 5 parts; antioxidant RD, 1.5 parts; antioxidant 4020, 1 part; carbon black N660, 60 parts; Aromatic oil, 6 parts; plasticizer dioctyl ester DOP, 4 parts; Sulfur, 1.0 part; accelerator CBS, 0.8 part; accelerator DM, 0.8 part.

2. A method for preparing a sealing rubber, characterized in that: The method comprises: Step 1, plasticizing BIIR and NBR: plasticizing with an internal mixer and thinning with an open mixer to obtain plasticized rubber; Step 2, mixing process: using an internal mixer to perform first-stage mixing and second-stage mixing to obtain a sealing rubber component.

3. A method for preparing a sealing rubber according to claim 2, characterized in that: The step 1 comprises: Step 1.1, heating the internal mixer to a temperature above the discharge temperature, adding BIIR, NBR and liquid nitrile latex, controlling the speed of the internal mixer, and performing discharge after the temperature of the internal mixer rises to the discharge temperature to obtain a premixed mixed rubber; Step 1.2, adjust the temperature of the front and rear rollers of the mixing mill to the plasticizing temperature, and reduce the distance between the front and rear rollers; add the mixed rubber premixed by the internal mixer, plasticate on the mixing mill, and pass the rollers; then increase the distance between the front and rear rollers, tamp the rubber with a rubber turning machine, perform the five-pack three-roll process, and then place the sheet down to obtain the plasticized rubber.

4. A method for preparing a sealing rubber according to claim 3, characterized in that: In the step 1.1, the debinding temperature is 130-140° C., and the speed of the internal mixer is 28 r / min.

5. A method for preparing a sealing rubber according to claim 3, characterized in that: In the step 1.2, the plasticizing temperature is 45-55°C, the distance between the front and rear rollers is adjusted to less than 2 mm, and the rollers are passed 2-3 times; the distance between the front and rear rollers is adjusted to more than 5 mm, the rubber turning machine is used to tamp the rubber 10-12 times, and the lower sheet is parked for 24 hours.

6. A method for preparing a sealing rubber according to claim 2, characterized in that: The first stage mixing in step 2 comprises: Step 2.1.1, adjust the speed of the internal mixer, raise the top bolt, add the plasticized rubber, zinc oxide, stearic acid, magnesium oxide, antioxidant, phenolic resin, and flow degassing agent SC617 that have been plasticated and parked in the internal mixer and the open mixer, and perform internal mixing; Step 2.1.2, add half of carbon black for internal mixing; Step 2.1.3, add the remaining carbon black and all the plasticizers dioctyl ester and aromatic oil, perform internal mixing, discharge the rubber, remove the sheets, cool, and stand to obtain a mixed rubber compound.

7. A method for preparing a sealing rubber according to claim 6, characterized in that: In step 2.1.1, the mixer speed is 28 r / min, and the mixing time is 2 to 3 minutes; in step 2.1.2, the mixing time is 2 to 3 minutes; in step 2.1.3, the mixing time is 4 to 5 minutes, and the cooling parking time is 12 hours; the temperature of steps 2.1.1 to 2.1.3 is controlled not to exceed 120°C throughout the process.

8. A method for preparing a sealing rubber according to claim 2, characterized in that: The two-stage mixing in step 2 includes: Step 2.2.1, adjusting the speed of the internal mixer, adding a first-stage mixed rubber material, sulfur, and accelerator, and performing internal mixing and rubber removal; Step 2.2.2, after the five-pack-three-roll process on the mixing mill, the sheet is removed for cooling and parking to obtain a sealing rubber component.

9. A method for preparing a sealing rubber according to claim 8, characterized in that: In the step 2.2.1, the speed of the internal mixer is 25 r / min, the internal mixing time is 1 to 1.5 minutes, and the debinding temperature does not exceed 90° C.; in the step 2.2.2, the thickness of the lower sheet is 5 mm.

10. A hose joint sealing structure, characterized in that: It comprises the sealing rubber assembly, sleeve and joint assembly core rod according to claim 1, wherein a sealing groove is provided at the tail of the joint assembly core rod, the sealing groove matches the sealing rubber assembly, the sealing rubber assembly is sleeved on the sealing groove, the sleeve is sleeved on the outer periphery of the joint assembly core rod, and the sleeve is buckled and pressed on the joint assembly core rod to deform the sealing rubber assembly at the tail of the joint assembly core rod, thereby increasing the sealing performance of the tail of the joint assembly core rod.

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