Heavy-water-resistant nuclear power catenary hose and preparation method thereof

Abstract

The invention belongs to the technical field of nuclear power hoses, and particularly relates to a heavy-water-resistant nuclear power catenary hose and a preparation method thereof.The hose comprises inner rubber, middle rubber and outer rubber, the inner rubber, the middle rubber and the outer rubber are sequentially arranged from inside to outside, a steel wire layer is arranged between the inner rubber and the middle rubber, and a steel wire layer is arranged between the middle rubber and the outer rubber; main body rubber of the inner rubber is ethylene propylene rubber 13561, main body rubber of the middle rubber is ethylene propylene rubber 4045, and main body rubber of the outer rubber is chlorosulfonated polyethylene rubber 40 and ethylene propylene rubber 4045. The hose has good nuclear radiation resistance, ozone aging resistance and high heat resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power hoses, and in particular relates to a heavy water resistant nuclear power catenary hose and a preparation method thereof. Background Art

[0002] With the rapid development of large-scale nuclear power plant construction in my country, the localization process of nuclear power plant equipment has been significantly accelerated, and the requirements for improving the quality of nuclear power hoses and localization substitution have become increasingly urgent. my country has built more than 50 nuclear power plants and has formed a manufacturing capacity of 10 sets of million-kilowatt pressurized water reactor main equipment per year, and the comprehensive localization rate of independent third-generation nuclear power has reached more than 90%. This means that the manufacturing capacity of key accessories such as nuclear power hoses requires localization as soon as possible in order to better meet the needs of nuclear power plant construction and operation. my country has developed rapidly in the fields of nuclear energy heating and industrial heating, and the application of nuclear technology in many fields has entered a stage of rapid development. This provides a wider application space for equipment such as nuclear power hoses and promotes the development and innovation of related technologies.

[0003] As an indispensable part of nuclear power plants, nuclear power catenary hoses are mainly used to transport nuclear reactor fuel, coolants and other media. The research and development of nuclear power catenary hoses can meet the demanding working conditions of nuclear power plants in transporting nuclear fuel and media such as heavy water coolants, solving the bottleneck problem. Summary of the invention

[0004] The object of the present invention is to provide a heavy water resistant nuclear power catenary hose and a preparation method thereof, wherein the hose has good nuclear radiation resistance, ozone aging resistance and high heat resistance.

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

[0006] A heavy water resistant nuclear power catenary hose comprises an inner rubber, a middle rubber and an outer rubber, wherein the inner rubber, the middle rubber and the outer rubber are arranged in sequence from the inside to the outside, a steel wire layer is provided between the inner rubber and the middle rubber, and a steel wire layer is provided between the middle rubber and the outer rubber; the main rubber of the inner rubber is EPDM 13561, the main rubber of the middle rubber is EPDM 4045, and the main rubber of the outer rubber is chlorosulfonated polyethylene rubber 40 and EPDM 4045.

[0007] The inner rubber has the following proportions of components by weight:

[0008]

[0009] The proportions of the components of the middle glue are as follows by weight:

[0010]

[0011]

[0012] The outer glue has the following proportions of components by weight:

[0013]

[0014] A method for preparing a heavy water resistant nuclear power catenary hose, the method comprising:

[0015] Step 1: Preparation of inner rubber: According to the ratio of each component in the inner rubber, the components of the inner rubber are mixed to obtain a mixed rubber, and then filtered and sulfurized to obtain the inner rubber;

[0016] Step 2: Preparation of medium rubber: According to the ratio of each component in the medium rubber, the components of the medium rubber are mixed to obtain a mixed rubber, and then filtered and sulfurized to obtain the medium rubber;

[0017] Step 3: Preparation of outer rubber: according to the ratio of each component in the outer rubber, the components of the outer rubber are mixed to obtain a mixed rubber, and then filtered and sulfurized to obtain the outer rubber;

[0018] Step 4: Hose molding: extrude inner rubber, weave two layers of steel wire, weave middle rubber, extrude outer rubber, lay inner rubber in steel wire layer, lay middle rubber between two layers of steel wire, and cover outer rubber on the outside of steel wire layer to obtain semi-finished hose, which is then vulcanized, packaged and inspected to obtain finished hose.

[0019] The step 1 comprises:

[0020] Step 1.1: Mix the components of the inner rubber to obtain a mixed rubber;

[0021] Step 1.2: Filter the mixed gel to obtain filtered gel;

[0022] Step 1.3: Filter the gel and add sulfur to obtain the inner gel.

[0023] The step 1.1 comprises:

[0024] Step 1.1.1: First, put the main rubber EPDM 13561 into the internal mixer and mix for 2 minutes at a rotor speed of 30r / min, and wait for the rubber to be mixed evenly;

[0025] Step 1.1.2: Add the small material active agent zinc oxide, stearic acid and antioxidant into the internal mixer and mix for 1-3 minutes;

[0026] Step 1.1.3: After mixing evenly, add carbon black, oil and other remaining powders and mix for 1-3 minutes;

[0027] Step 1.1.4: Lift and press the top bolt 1-3 times, and the temperature reaches 120℃ to drain the glue;

[0028] Step 1.1.5: Pour and turn the rubber on the mixing mill to obtain a mixed rubber sheet.

[0029] The step 1.2 comprises: using a φ150 pin-type cold feed rubber filter, setting the temperature of the feed section, the body and the head, the rotation speed of 14r / min, filtering out a section of rubber material, and stopping for 16 hours to obtain filtered rubber.

[0030] The step 1.3 comprises:

[0031] Step 1.3.1: Use a 90E meshing internal mixer and a 26-inch open mixer to mix the filter rubber and the vulcanizing agent bag for 60 seconds;

[0032] Step 1.3.2: Lift and press the top bolt once, continue mixing for 30 seconds, and drain at 90℃;

[0033] Step 1.3.3: Turn the rubber on the mixing mill, pour and flip the rubber, and produce the inner rubber sheet.

[0034] The step 4 comprises:

[0035] Step 4.1: The core uses a nylon core with a diameter of 18.6mm; the inner rubber uses ESP80, the extrusion temperature is 55℃, 60℃, 65℃, 70℃, the free extrusion wall thickness is 3.2mm, the extrusion outer diameter is 24mm, and the inner tube has a smooth appearance after extrusion without any abnormality;

[0036] Step 4.2: Weave on a 36-spindle weaving machine, with a steel wire specification of 0.3*2750, 36*7 strands for the first layer and 36*8 strands for the second layer;

[0037] Step 4.3: The middle rubber is EPZ-1, with a thickness of 0.35mm, a width of 88mm, and a braided outer diameter of 27.2mm.

[0038] Step 4.4: The outer rubber is HCSM-1, the extrusion temperature is 50℃, 60℃, 65℃, and 70℃, the free extrusion wall thickness is 2.5mm, the extrusion outer diameter is 31.1mm, and the inner tube after extrusion has a smooth appearance, uniform color, and no abnormalities.

[0039] Step 4.5: Stick the engraved strips on the semi-finished product and wrap it with water cloth, then vulcanize it. The first stage vulcanization is 0.43MPa*10min; the second stage vulcanization is 0.4MPa*100min.

[0040] Step 4.6: After vulcanization, unwind the cloth and perform a pressure test at 70MPa for 2min*4 times. After the pressure test is qualified, the finished product inspector will check the appearance of the pipe body, cut the head to check the inner and outer glue adhesion, inner and outer diameter dimensions, and eccentricity. After the inspection is qualified, samples will be taken for type inspection, and the remaining finished products will be packaged and put into storage.

[0041] The beneficial technical effects of the present invention are:

[0042] 1. The heavy water resistant nuclear power catenary hose provided by the present invention has good nuclear radiation resistance, ozone aging resistance and high heat resistance.

[0043] 2. The heavy water resistant nuclear power catenary hose provided by the present invention has achieved the performance of imported hoses through experiments and verification. It can withstand nuclear radiation and harsh working conditions of heavy water media in actual use and testing, and solves the bottleneck problem of catenary hoses. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of a heavy water resistant nuclear power catenary hose provided by the present invention.

[0045] In the figure: 1-inner rubber layer, 2-middle rubber layer, 3-steel wire layer, 4-outer rubber layer. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0047] like Figure 1 As shown, a heavy water resistant nuclear power catenary hose provided by the present invention comprises an inner rubber, a middle rubber and an outer rubber, wherein the inner rubber, the middle rubber and the outer rubber are arranged in sequence from the inside to the outside, a steel wire layer is provided between the inner rubber and the middle rubber, and a steel wire layer is provided between the middle rubber and the outer rubber.

[0048] The inner rubber is made of high Mooney and high elastic EPDM13561 as the main rubber. EPDM is made of ethylene and propylene by solution copolymerization. EPDM is mainly produced by low-temperature solution copolymerization, with excellent ozone resistance, high heat resistance and aging resistance. The activator is active zinc oxide, which can improve the cross-linking degree and reaction speed of the rubber; the antioxidant is 445 antioxidant with excellent heat aging resistance; the plasticizer is white paraffin oil, which can also be processed at a higher temperature, with good electrical insulation and good light and weather resistance, but easy to migrate and be easily affected by hydrocarbons; other additives are stearic acid, i.e. octadecanoic acid, with the molecular formula C18H36O2. Stearic acid plays an important role in the synthesis and processing of rubber. Stearic acid is a widely used vulcanization activator in natural rubber, synthetic rubber and latex, and can also be used as a plasticizer and softener. Stearic acid needs to be added as an emulsifier in the production of synthetic rubber. When making foam rubber, stearic acid can be used as a foaming agent. Stearic acid can also be used as a release agent for rubber products. Triphenylsiloxymethylphenylsilazane is also used in the inner rubber to improve the nuclear radiation resistance. While ensuring radiation resistance and aging resistance, it also guarantees high strength, flex resistance, good heat tear resistance and a wide temperature adaptability range.

[0049] By weight, the proportions of the components in the inner rubber are as follows:

[0050]

[0051]

[0052] The middle rubber selects low Mooney ethylene propylene rubber EPDM4045 as the main rubber. Zinc oxide, an activator, can improve the physical and mechanical properties and adhesion properties. Adding lignin and other ingredients to the middle rubber can improve the tensile stress of the rubber and reduce the elongation of the hose.

[0053] By weight, the proportions of the components in the medium glue are as follows:

[0054]

[0055]

[0056] The outer rubber is chlorosulfonated polyethylene rubber CSM 40, which has good ozone aging resistance and can protect the steel wire skeleton layer structure inside the hose.

[0057] By weight, the proportions of the components in the outer glue are as follows:

[0058]

[0059] The present invention provides a method for preparing a heavy water resistant nuclear power catenary hose, which specifically comprises the following steps:

[0060] Step 1: Preparation of inner rubber: According to the ratio of each component in the inner rubber, the components of the inner rubber are mixed to obtain a mixed rubber, and then filtered and sulfurized to obtain the inner rubber;

[0061] Step 1.1: Mix the components of the inner rubber to obtain a mixed rubber

[0062] Step 1.1.1: First, put the main rubber EPDM 13561 into the internal mixer and mix for 2 minutes at a rotor speed of 30r / min, and wait for the rubber to be mixed evenly;

[0063] Step 1.1.2: Add the small material active agent zinc oxide, stearic acid and antioxidant into the internal mixer and mix for about 1-3 minutes;

[0064] Step 1.1.3: After mixing evenly, add carbon black, oil and other remaining powders and mix for about 1-3 minutes;

[0065] Step 1.1.4: Lift and press the top bolt 1-3 times, and remove the glue when the temperature reaches about 120℃;

[0066] Step 1.1.5: Pour and turn the rubber on the mixing mill to obtain mixed rubber for the next pouring process.

[0067] Step 1.2: Filter the mixed gel to obtain filtered gel

[0068] φ150 pin-type cold-feed rubber filter. Set the feed section, body, and head temperature, and the speed to 14r / min. Filter out a section of rubber, leave it for 16 hours, and get the filtered rubber for use in the next process.

[0069] Step 1.3: Filter the gel and add sulfur to obtain the inner gel

[0070] Step 1.3.1: 90E intermeshing internal mixer, 26-inch open mixer. Add filter rubber and vulcanizing agent bag and mix for 60 seconds;

[0071] Step 1.3.2: Lift and press the top bolt once, continue mixing for 30 seconds, and drain at 90℃;

[0072] Step 1.3.3: Pour and turn the rubber on the mixing mill to obtain the inner rubber for the next pouring process.

[0073] Step 2: Preparation of medium rubber: According to the ratio of each component in the medium rubber, the components of the medium rubber are mixed to obtain a mixed rubber, and then filtered and sulfurized to obtain the medium rubber;

[0074] The specific method for preparing the middle rubber in this step is the same as the method for preparing the inner rubber in step 1, except that the components and proportions of the middle rubber are different from those of the specific method for preparing the inner rubber in step 1.

[0075] Step 3: Preparation of outer rubber: according to the ratio of each component in the outer rubber, the components of the outer rubber are mixed to obtain a mixed rubber, and then filtered and sulfurized to obtain the outer rubber;

[0076] The specific method for preparing the outer glue in this step is the same as the method for preparing the inner glue in step 1, except that the components and the ratio of the components in the outer glue are different from the specific method for preparing the inner glue in step 1.

[0077] Step 4: Hose molding: extrude inner rubber, weave two layers of steel wire, weave middle rubber, extrude outer rubber, lay inner rubber in steel wire layer, lay middle rubber between two layers of steel wire, and cover outer rubber on the outside of steel wire layer to obtain semi-finished hose, which is then vulcanized, packaged and inspected to obtain finished hose.

[0078] Step 4.1: Inner rubber pressing

[0079] The core is made of 18.6mm diameter nylon core; the inner rubber is ESP80, the extrusion temperature is 55℃, 60℃, 65℃, 70℃, the free extrusion wall thickness is 3.2mm, the extrusion outer diameter is 24mm, and the inner tube has a smooth appearance after extrusion without any abnormality;

[0080] Step 4.2: Wire Braiding

[0081] Weaving on a 36-spindle braiding machine, the steel wire specification is 0.3*2750, the first layer is 36*7 strands, and the second layer is 36*8 strands;

[0082] Step 4.3: Medium Rubber Weaving

[0083] The middle rubber is EPZ-1, with a thickness of 0.35mm, a width of 88mm, and a braided outer diameter of 27.2mm.

[0084] Step 4.4: External coating

[0085] The outer rubber is HCSM-1, the extrusion temperature is 50℃, 60℃, 65℃, and 70℃, the free extrusion wall thickness is 2.5mm, the extrusion outer diameter is 31.1mm, and the inner tube after extrusion has a smooth appearance, uniform color, and no abnormalities.

[0086] Step 4.5: Vulcanization

[0087] The semi-finished product is affixed with engraved strips and wrapped with water cloth before vulcanization. The first stage vulcanization: 0.43MPa*10min; the second stage vulcanization: 0.4MPa*100min.

[0088] Step 4.6: Finished product packaging

[0089] After vulcanization, the cloth is untied and pressure tested at 70MPa for 2min*4 times. After the pressure test is qualified, the finished product inspector will check the appearance of the pipe body, cut the head to check the inner and outer glue adhesion, inner and outer diameter dimensions, eccentricity. After passing the inspection, samples are taken for type inspection, and the remaining finished products are packaged and put into storage.

[0090] 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 heavy water resistant nuclear power catenary hose, characterized in that: It includes an inner rubber, a middle rubber and an outer rubber, which are arranged in sequence from the inside to the outside. A steel wire layer is provided between the inner rubber and the middle rubber, and a steel wire layer is provided between the middle rubber and the outer rubber. The main rubber of the inner rubber is EPDM rubber 13561, the main rubber of the middle rubber is EPDM rubber 4045, and the main rubber of the outer rubber is chlorosulfonated polyethylene rubber 40 and EPDM rubber 4045.

2. A heavy water resistant nuclear power catenary hose according to claim 1, characterized in that: The inner rubber has the following proportions of components by weight:

3. A heavy water resistant nuclear power catenary hose according to claim 1, characterized in that: The proportions of the components of the middle glue are as follows by weight:

4. A heavy water resistant nuclear power catenary hose according to claim 1, characterized in that: The outer glue has the following proportions of components by weight:

5. A method for preparing a heavy water resistant nuclear power catenary hose, characterized in that: The method comprises: Step 1: Preparation of inner rubber: According to the ratio of each component in the inner rubber, the components of the inner rubber are mixed to obtain a mixed rubber, and then filtered and sulfurized to obtain the inner rubber; Step 2: Preparation of medium rubber: According to the ratio of each component in the medium rubber, the components of the medium rubber are mixed to obtain a mixed rubber, and then filtered and sulfurized to obtain the medium rubber; Step 3: Preparation of outer rubber: according to the ratio of each component in the outer rubber, the components of the outer rubber are mixed to obtain a mixed rubber, and then filtered and sulfurized to obtain the outer rubber; Step 4: Hose molding: extrude inner rubber, weave two layers of steel wire, weave middle rubber, extrude outer rubber, lay inner rubber in steel wire layer, lay middle rubber between two layers of steel wire, and cover outer rubber on the outside of steel wire layer to obtain semi-finished hose, which is then vulcanized, packaged and inspected to obtain finished hose.

6. The method for preparing a heavy water resistant nuclear power catenary hose according to claim 5, characterized in that: The step 1 comprises: Step 1.1: Mix the components of the inner rubber to obtain a mixed rubber; Step 1.2: Filter the mixed gel to obtain filtered gel; Step 1.3: Filter the gel and add sulfur to obtain the inner gel.

7. The method for preparing a heavy water resistant nuclear power catenary hose according to claim 6, characterized in that: The step 1.1 comprises: Step 1.1.1: First, put the main rubber EPDM 13561 into the internal mixer and mix for 2 minutes at a rotor speed of 30r / min, and wait for the rubber to be mixed evenly; Step 1.1.2: Add the small material active agent zinc oxide, stearic acid and antioxidant into the internal mixer and mix for 1-3 minutes; Step 1.1.3: After mixing evenly, add carbon black, oil and other remaining powders and mix for 1-3 minutes; Step 1.1.4: Lift and press the top bolt 1-3 times, and the temperature reaches 120℃ to drain the glue; Step 1.1.5: Pour and turn the rubber on the mixing mill to obtain a mixed rubber sheet.

8. The method for preparing a heavy water resistant nuclear power catenary hose according to claim 6, characterized in that: The step 1.2 comprises: using a φ150 pin-type cold feed rubber filter, setting the temperature of the feed section, the body and the head, the rotation speed of 14r / min, filtering out a section of rubber material, parking for 16 hours, and obtaining filtered rubber.

9. The method for preparing a heavy water resistant nuclear power catenary hose according to claim 6, characterized in that: The step 1.3 comprises: Step 1.3.1: Use a 90E meshing internal mixer and a 26-inch open mixer to mix the filter rubber and the vulcanizing agent bag for 60 seconds; Step 1.3.2: Lift and press the top bolt once, continue mixing for 30 seconds, and drain at 90℃; Step 1.3.3: Turn the rubber on the mixing mill, pour and flip the rubber, and produce the inner rubber sheet.

10. The method for preparing a heavy water resistant nuclear power catenary hose according to claim 5, characterized in that: The step 4 comprises: Step 4.1: The core uses a nylon core with a diameter of 18.6mm; the inner rubber uses ESP80, the extrusion temperature is 55℃, 60℃, 65℃, 70℃, the free extrusion wall thickness is 3.2mm, the extrusion outer diameter is 24mm, and the inner tube has a smooth appearance after extrusion without any abnormality; Step 4.2: Weave on a 36-spindle weaving machine, with a steel wire specification of 0.3*2750, 36*7 strands for the first layer and 36*8 strands for the second layer; Step 4.3: The middle rubber is EPZ-1, with a thickness of 0.35mm, a width of 88mm, and a braided outer diameter of 27.2mm; Step 4.4: The outer rubber is HCSM-1, the extrusion temperature is 50℃, 60℃, 65℃, 70℃, the free extrusion wall thickness is 2.5mm, the extrusion outer diameter is 31.1mm, and the inner tube after extrusion has a smooth appearance, uniform color, and no abnormalities; Step 4.5: Stick the engraved strips on the semi-finished product and wrap it with water cloth before vulcanization. The first stage vulcanization: 0.43MPa*10min; the second stage vulcanization: 0.4MPa*100min; Step 4.6: After vulcanization, unwind the cloth and perform a pressure test at 70MPa for 2min*4 times. After the pressure test is qualified, the finished product inspector will check the appearance of the pipe body, cut the head to check the inner and outer glue adhesion, inner and outer diameter dimensions, and eccentricity. After the inspection is qualified, samples will be taken for type inspection, and the remaining finished products will be packaged and put into storage.

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