Special brominated butyl rubber lining material for nuclear power plant and preparation process

Abstract

The invention relates to the technical field of rubber linings, and particularly discloses a special brominated butyl rubber lining material for a nuclear power plant and a preparation process. The material is prepared from the following components in parts by weight: 100.0 parts of butyl bromide, 20.0 parts of high-abrasion-resistance carbon black, 30.0 parts of semi-reinforcing carbon black, 8.0 parts of naphthenic oil, 2.0 parts of zinc oxide, 0.1 part of magnesium oxide, 1.0 part of stearic acid, 1.0 part of an accelerant and 1.0 part of vulcanized resin. The material has the advantages of complete saturation of a main chain, excellent aging resistance, high bonding strength and the like, greatly improves the aging resistance compared with the existing chloroprene rubber and hard natural rubber anticorrosive linings of nuclear power plants, can better meet the use requirements of the rubber linings of the nuclear power plants, and prolongs the service life of the rubber linings.

Description

Technical Field

[0001] The invention belongs to the technical field of rubber linings, and in particular relates to a special brominated butyl rubber lining material for nuclear power plants and a preparation process thereof. Background Art

[0002] In nuclear power plant system equipment, rubber anti-corrosion linings are widely used to isolate highly corrosive media such as seawater, strong acids, and strong alkalis to protect the metal matrix of system equipment from corrosion. At present, nuclear power plants mainly use chloroprene rubber for seawater media and hard natural rubber for acid and alkali media. In the equipment manufacturing stage, the rubber lining is vulcanized by hot vulcanization method under high temperature and pressure in the vulcanization tank.

[0003] According to the actual experience of existing nuclear power plant projects, the service life of chloroprene rubber and hard natural rubber is generally less than 15 years, but the design life of nuclear power plants is usually 40 years. In order to obtain greater economic benefits, the life of the unit is generally extended to more than 60 years. This means that the rubber anti-corrosion lining needs to be replaced as a whole 3 to 4 times during the life of the unit. Since there are many rubber lining equipment in nuclear power plants, the overall replacement of rubber lining will not only bring greater direct costs, but also cause greater losses in the unit shutdown due to the replacement period and frequency.

[0004] Although chloroprene rubber has good acid and alkali resistance and easy adhesion, and hard natural rubber has good corrosion resistance, both cannot meet the long-life use requirements of nuclear power plants, and even pose hidden dangers to the safe and stable operation of nuclear power plant units. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a special brominated butyl rubber lining material and a preparation process for a nuclear power plant in view of the above-mentioned deficiencies in the prior art. The rubber lining material is made of brominated butyl rubber, and by utilizing its characteristics of anti-oxidation, weather resistance and high air tightness, a new type of special brominated butyl rubber sheet with a fully saturated main chain and excellent aging resistance is produced and developed. The rubber lining of equipment that meets the requirements of the nuclear power plant system is prepared through a vulcanization tank heating vulcanization process or a body heating vulcanization process.

[0006] In order to solve the above problems, the technical solution of the present invention is as follows: a special brominated butyl rubber lining material for a nuclear power plant, the material comprises the following components (by weight):

[0007] Butyl bromide: 100.0 parts,

[0008] High wear-resistant carbon black: 20.0 parts,

[0009] Semi-reinforcing carbon black: 30.0 parts,

[0010] Naphthenic oil: 8.0 parts,

[0011] Zinc oxide: 2.0 parts,

[0012] Magnesium oxide: 0.1 parts,

[0013] Stearic acid: 1.0 parts,

[0014] Accelerator: 1.0 part,

[0015] Vulcanized resin: 1.0 part.

[0016] The process includes the following steps:

[0017] S1: Mix butyl bromide, stearic acid, magnesium oxide, accelerator, high wear-resistant carbon black, naphthenic oil, semi-reinforced carbon black and naphthenic oil in a 55-liter bucket mixer.

[0018] S2: Use Φ150 filter for filtration, the filter density is 30 mesh, the number of layers is 2, the head temperature is 65-80℃, the screw temperature is 45-55℃, and the slurry is obtained after filtering the residue.

[0019] S3: Add the slurry after filtering out impurities into an 18-inch open mill, add zinc oxide and vulcanized resin at the same time, mix evenly to form a rubber strip with a thickness of 10-12mm and a width of 100-120mm. Finally, add sodium alkyl sulfonate solution to cool the isolation agent. After cooling for 10 minutes, remove and dry.

[0020] S4: Use Φ110 cold feed extruder, head 65~75℃, die 75~85℃, body 45~55℃, screw 45~55℃, extrusion speed controlled at 60~80M / h, to extrude special brominated butyl rubber lined semi-finished sheet.

[0021] S5: The semi-finished plate is pasted on the steel substrate with a matching adhesive, and vulcanized in a vulcanizing tank. The pressure is controlled at 0.3-0.35MPa, the temperature is controlled at 135-145°C, and the time is controlled at 2-3 hours. After vulcanization, a special brominated butyl rubber lining product is obtained.

[0022] Step S1 includes the following steps:

[0023] S11: Adding bromobutyl rubber into the internal mixer for 2 minutes;

[0024] S12: adding stearic acid, magnesium oxide and accelerator and mixing for 3 minutes;

[0025] S13: adding high wear-resistant carbon black and 50% by weight of naphthenic oil and mixing for 5 minutes;

[0026] S14: adding semi-reinforcing carbon black and the remaining 50% by weight of naphthenic oil and mixing for 5 minutes;

[0027] S15: discharge the glue to the open mixer for tableting and cooling, the time is 3 minutes.

[0028] The initial mixing temperature in step S1 is 70°C.

[0029] The debinding temperature in step S15 is 110°C.

[0030] The remarkable effect of the present invention is that a special brominated butyl rubber lining material and preparation process for nuclear power plants is provided. The produced lining material is a brominated polymer derived from isobutylene and para-methylstyrene copolymer, which has the advantages of complete main chain saturation, excellent aging resistance, high bonding strength, etc., greatly improving the aging resistance of the existing chloroprene rubber and hard natural rubber anti-corrosion linings of nuclear power plants, and can better meet the use requirements of the rubber lining of nuclear power plants and extend its service life. DETAILED DESCRIPTION

[0031] The technical solutions in the invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the invention, not all of them. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of the invention.

[0032] In the description of the present invention, it should be noted that the indication of direction or position relationship such as "upper" is only for the convenience and simplification of description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it should not be understood as a limitation of the present invention.

[0033] In the description of the present invention, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connect", "set", "install", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0035] A special brominated butyl rubber lining material for nuclear power plants, comprising the following components (by weight):

[0036] Butyl bromide: 100.0 parts

[0037] High wear-resistant carbon black: 20.0 parts

[0038] Semi-reinforcing carbon black: 30.0 parts

[0039] Naphthenic oil: 8.0 parts

[0040] Zinc oxide: 2.0 parts

[0041] Magnesium oxide: 0.1 part

[0042] Stearic acid: 1.0 parts

[0043] Accelerator: 1.0 part

[0044] Vulcanized resin: 1.0 part

[0045] The formula uses brominated butyl. Compared with traditional rubber lining materials, its main chain is fully saturated and has excellent oxidation resistance, which greatly improves its aging resistance and extends its service life. The formula uses a resin vulcanization system to greatly improve the physical property retention rate of special brominated butyl rubber under high temperature conditions. The retention rates of tensile strength and elongation at break in 110℃×7 days aging test can reach more than 90%. The reinforcing agent uses high wear-resistant and semi-reinforcing carbon black, which improves the tensile strength and wear resistance of the new special brominated butyl rubber. The use of high wear-resistant carbon black and semi-reinforcing carbon black can meet the performance requirements of rubber insulation for lining electric spark inspection, among which the performance requirement of rubber insulation for lining electric spark inspection is no leakage at 3000 volts per millimeter thick rubber plate.

[0046] A process for preparing a special brominated butyl rubber lining material for a nuclear power plant includes the following steps:

[0047] S1: Mixing is carried out using a 55-liter bucket mixer, with an initial mixing temperature of 70°C

[0048] S11: Adding bromobutyl rubber into the internal mixer for 2 minutes;

[0049] S12: adding stearic acid, magnesium oxide and accelerator and mixing for 3 minutes;

[0050] S13: adding high wear-resistant carbon black and 50% by weight of naphthenic oil and mixing for 5 minutes;

[0051] S14: adding semi-reinforcing carbon black and the remaining 50% by weight of naphthenic oil and mixing for 5 minutes;

[0052] S15: The glue is discharged to the open mixer for tableting and cooling, the time is 3 minutes, and the glue discharge temperature is 110°C.

[0053] S2: Use Φ150 filter for filtration, the filter density is 30 mesh, the number of layers is 2, the head temperature is 65-80℃, the screw temperature is 45-55℃, and the slurry is obtained after filtering the residue.

[0054] S3: Add the slurry after filtering out impurities into an 18-inch open mill, add zinc oxide and vulcanized resin at the same time, mix evenly to form a rubber strip with a thickness of 10-12mm and a width of 100-120mm. Finally, add sodium alkyl sulfonate solution to cool the isolation agent. After cooling for 10 minutes, remove and dry.

[0055] S4: Use Φ110 cold feed extruder, head 65~75℃, die 75~85℃, body 45~55℃, screw 45~55℃, extrusion speed controlled at 60~80M / h, to extrude special brominated butyl rubber lined semi-finished sheet.

[0056] S5: The semi-finished plate is pasted on the steel substrate with a matching adhesive. As an embodiment, vulcanization is performed in a vulcanization tank. As another embodiment, bulk vulcanization is performed. The pressure is controlled at 0.3-0.35 MPa, the temperature is controlled at 135-145° C., and the time is controlled at 2-3 hours. After vulcanization, a special brominated butyl rubber lining product is obtained.

[0057] Furthermore, the technical indicators and performance of the special brominated butyl rubber lining for nuclear power plants of the present invention are tested, and a horizontal test comparison is conducted with the main performance indicators of the traditional rubber lining.

[0058] Main technical indicators of the embodiment:

[0059] (1) Hardness (Shore A): 53°

[0060] (2) Density: 1.182 g / cm 3

[0061] (3) Tensile strength (Mpa): 13.8

[0062] (4) Elongation at break (%): 885

[0063] (5) Tear strength (KN / M): 33

[0064] Horizontal comparison test results

[0065]

[0066]

[0067] Example Excellent performance description

[0068] Compared with traditional rubber lining materials, special bromobutyl rubber lining materials have the following excellent properties.

[0069] (1) Excellent weather resistance

[0070] Under the experimental conditions of the test piece being elongated 300% and exposed to the sun for one year, no cracking occurred; under the same conditions, natural rubber showed serious cracking in 7 days, and chloroprene rubber showed a certain degree of cracking in 30 days.

[0071] (2) Excellent ozone resistance

[0072] Under the experimental conditions of ozone concentration of 100PPb and test piece elongation of 100%, no cracking will occur within 72 hours; under the same conditions, natural rubber will show serious cracking within 1 hour and chloroprene rubber will show serious cracking within 2 hours.

[0073] (3) Excellent air tightness and anti-penetration performance

[0074] The air tightness of the present invention is excellent among all the general rubber materials at present, and its air tightness is 20 times that of natural rubber, 13 times that of EPDM rubber, 8 times that of styrene-butadiene rubber, and 2 times that of nitrile-butadiene rubber. At the same time, the water absorption and water permeability are extremely low, which are 10 to 15 times lower than those of general rubbers such as natural rubber, styrene-butadiene rubber, and chloroprene rubber.

[0075] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A special brominated butyl rubber lining material for nuclear power plants, characterized in that: The material includes the following components (by weight): Butyl bromide: 100.0 parts, High wear-resistant carbon black: 20.0 parts, Semi-reinforcing carbon black: 30.0 parts, Naphthenic oil: 8.0 parts, Zinc oxide: 2.0 parts, Magnesium oxide: 0.1 parts, Stearic acid: 1.0 parts, Accelerator: 1.0 part, Vulcanized resin: 1.0 part.

2. A process for preparing special brominated butyl rubber lining material for nuclear power plants, characterized in that: The process includes the following steps: S1: Mix butyl bromide, stearic acid, magnesium oxide, accelerator, high wear-resistant carbon black, naphthenic oil, semi-reinforced carbon black and naphthenic oil in a 55-liter bucket mixer. S2: Use Φ150 filter for filtration, the filter density is 30 mesh, the number of layers is 2, the head temperature is 65-80℃, the screw temperature is 45-55℃, and the slurry is obtained after filtering the residue. S3: Add the slurry after filtering out impurities into an 18-inch open mill, add zinc oxide and vulcanized resin at the same time, mix evenly to form a rubber strip with a thickness of 10-12mm and a width of 100-120mm. Finally, add sodium alkyl sulfonate solution to cool the isolation agent. After cooling for 10 minutes, remove and dry. S4: Use Φ110 cold feed extruder, head 65~75℃, die 75~85℃, body 45~55℃, screw 45~55℃, extrusion speed controlled at 60~80M / h, to extrude special brominated butyl rubber lined semi-finished sheet. S5: The semi-finished plate is pasted on the steel substrate with a matching adhesive, and vulcanized in a vulcanizing tank. The pressure is controlled at 0.3-0.35MPa, the temperature is controlled at 135-145°C, and the time is controlled at 2-3 hours. After vulcanization, a special brominated butyl rubber lining product is obtained.

3. The process for preparing a special brominated butyl rubber lining material for a nuclear power plant according to claim 2, characterized in that: Step S1 includes the following steps: S11: Adding bromobutyl rubber into the internal mixer for 2 minutes; S12: adding stearic acid, magnesium oxide and accelerator and mixing for 3 minutes; S13: adding high wear-resistant carbon black and 50% by weight of naphthenic oil and mixing for 5 minutes; S14: adding semi-reinforcing carbon black and the remaining 50% by weight of naphthenic oil and mixing for 5 minutes; S15: discharge the glue to the open mixer for tableting and cooling, the time is 3 minutes.

4. The process for preparing a special brominated butyl rubber lining material for a nuclear power plant according to claim 2, characterized in that: The initial mixing temperature in step S1 is 70°C.

5. The process for preparing a special brominated butyl rubber lining material for a nuclear power plant according to claim 3, characterized in that: The debinding temperature in step S15 is 110°C.

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