CN113462167B - Bendable folded high neutron shielding performance organic silicon rubber and preparation method thereof - Google Patents
Bendable folded high neutron shielding performance organic silicon rubber and preparation method thereof Download PDFInfo
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- CN113462167B CN113462167B CN202110910055.6A CN202110910055A CN113462167B CN 113462167 B CN113462167 B CN 113462167B CN 202110910055 A CN202110910055 A CN 202110910055A CN 113462167 B CN113462167 B CN 113462167B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/045—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
- C08J2383/07—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a bendable folded high neutron shielding efficient organic silicon rubber and a preparation method thereof, wherein 110 silicon raw rubber is used as base rubber, and fumed silica and nuclear power grade B are added 4 C powder or foaming agent, and hot-pressing and vulcanizing under the action of a vulcanizing agent. According to different components of the material, the borosilicate rubber prepared by the invention can achieve a neutron shielding rate of over 99.9% no matter for fast neutrons, intermediate energy neutrons or slow neutrons. Can be widely applied to the neutron protection of a spallation neutron source, a nuclear facility pipeline and the personnel protection of a neutron radiation field; meanwhile, the material has simple preparation process and can be continuously extruded and molded.
Description
Technical Field
The invention relates to the technical field of special rubber materials, in particular to bendable folded high neutron shielding efficient organic silicon rubber and a preparation method thereof.
Background
China Spallation Neutron Source (CSNS) plan to build two target stations, each target station comprises about 20 spectrometers, at present, only 15% of the spectrometers are built, and in the next 10 years, 17 neutron spectrometers are put into construction. CSNS has limited space for construction, requires the use of a large amount of radiation shielding material at target stations, hot rooms, neutron tube systems, sample frames, scatter frames, detection frames, neutron choppers, scintillation detectors, and the like, and these parts have different shapes and complex structures, which require the shielding material to be flexible, freely cuttable and bendable, and adhesive. The neutron shielding material used in the early construction completely depends on the import, so that the construction period of the spectrometer is greatly increased, and the performance improvement of the neutron spectrometer is limited to a certain extent. Therefore, the autonomy of the engineering-grade high-performance flexible neutron shielding material can provide a powerful support for the construction of large scientific research devices in China, and the problem that the high-end shielding material depends on imported 'necks'. The development and application research of the flexible high-efficiency neutron shielding material not only has great economic value, but also can powerfully promote the development of the technology of large scientific research devices such as a spallation neutron source and the like, and has good social value.
Disclosure of Invention
The invention aims to solve the problems and provide bendable folded high neutron shielding efficient organic silicon rubber and a preparation method thereof, according to the characteristics of the molecular structure of an organic silicon material, the flexibility and the good tensile property of related materials are endowed, and the organic silicon rubber can be hot-pressed, cured and formed and can also be extruded for hot vulcanization forming 4 And C, uniformly mixing the powder C and a vulcanizing agent, and then carrying out hot press molding. According to the requirements of application scenes, a certain amount of closed-cell foaming agent can be added into the rubber compound, so that the flexibility of the material is further improved, and the material can be repeatedly folded at will. The material utilizes H atoms rich in 110 silica gel to slow down the diffusion rate of neutrons, and then utilizes B in the material 10 The slow neutrons are absorbed, and the neutron shielding effect is achieved.
The invention realizes the purpose through the following technical scheme:
the organic silicon rubber with bendable and bendable folding high neutron shielding efficiency comprises the following components in parts by weight:
100 parts of 110 silicon crude rubber, 20-45 parts of fumed silica and B 4 C5-100 parts, and vulcanizing agent 0.5-6.5 parts.
The organic silicon rubber with bendable and bendable folding high neutron shielding efficiency comprises the following components in parts by weight:
100 parts of 110 silicon crude rubber, 20-45 parts of fumed silica and B 4 C5-100 parts, vulcanizing agent 0.5-6.5 parts and foaming agent 1-6 parts.
The further scheme is that the foaming agent is one or more of sodium bicarbonate, a foaming agent H, a foaming agent F-36, a foaming agent AC, a foaming agent OBSH and a foaming agent AK.
In a further scheme, the vulcanizing agent is one or more of BPO, Biediwu and DCP.
Further, the B is 4 C is nuclear grade powder.
The invention also provides a preparation method of the bendable folded high neutron shielding efficient organic silicon rubber, which comprises the following steps:
a: preparing a rubber compound: adding 110 silicon crude rubber, fumed silica and B into a kneader in sequence according to the proportion 4 C, closing the upper cover and opening the kneading machine to knead the powder; kneading for 60 minutes, and after the inorganic powder and the 110 silicon crude rubber are completely fused, starting the kneading machine to heat the material; when the temperature of the material reaches 120 +/-10 ℃, starting the kneader and vacuumizing to more than 0.75 MPa.s, extracting for 60 +/-30 minutes, stopping vacuumizing and heating, opening the upper cover of the kneader, naturally cooling to room temperature, and taking out the kneaded mixed material;
b: mixing the rubber materials: putting the kneaded mixed rubber material on a roller of a two-roller rubber mixing mill, repeatedly rolling to remove air bubbles in the rubber material, repeatedly mixing for 10 times, adding a vulcanizing agent, and mixing for 6-8 times again; the roller spacing is high, the thickness of the film reaches 3.5 +/-0.1 mm, the film is completely taken down from the roller and placed on a clean stainless steel plate, the film is cut according to the size of a vulcanization mold frame and placed in the mold frame, and an upper cover of the mold frame is covered;
c: first-stage vulcanization molding: putting the vulcanization mold frame with the rubber sheet into a flat vulcanizing machine, setting vulcanization temperature, pressure and vulcanization time, starting the vulcanizing machine to perform hot-pressing vulcanization molding, taking out the mold frame after vulcanization is finished, opening the upper cover, and taking out the molded rubber sheet;
d: and (3) secondary vulcanization molding: putting the first-stage vulcanized molding rubber sheet into a blast oven with set temperature and time for second-stage vulcanization; and after the second-stage vulcanization is finished, taking out the vulcanized rubber sheet to obtain a final product.
The invention also provides a preparation method of the bendable folded high neutron shielding efficient organic silicon rubber, which comprises the following steps:
a: preparing a rubber compound: in the presence of kneadingAdding 110 silica gel, fumed silica and B into the machine in sequence according to the proportion 4 C, closing the upper cover and opening the kneading machine to knead the powder; kneading for 60 minutes, and after the inorganic powder and the 110 silicon crude rubber are completely fused, starting the kneading machine to heat the material; when the temperature of the material reaches 120 +/-10 ℃, starting the kneader and vacuumizing to more than 0.75 MPa.s, extracting for 60 +/-30 minutes, stopping vacuumizing and heating, opening the upper cover of the kneader, naturally cooling to room temperature, and taking out the kneaded mixed material;
b: mixing the rubber materials: putting the kneaded mixed rubber material on a roller of a two-roller rubber mixing mill, repeatedly rolling to remove air bubbles in the rubber material, repeatedly mixing for 10 times, adding a foaming agent and a vulcanizing agent, and mixing for 6-8 times again; high-speed roll spacing to make the thickness of the film reach 3.5 +/-0.1 mm, completely taking the film off the roller, placing the film on a clean stainless steel plate, cutting the film according to the size of a vulcanization die frame, placing the cut film into the die frame, and covering an upper cover of the die frame;
c: first-stage vulcanization molding: putting the vulcanization mold frame with the rubber sheet into a flat vulcanizing machine, setting vulcanization temperature, pressure and vulcanization time, starting the vulcanizing machine for hot-press vulcanization molding, taking out the mold frame after vulcanization is finished, opening the upper cover, and taking out the molded rubber sheet;
d: and (3) secondary vulcanization molding: putting the first-stage vulcanized molding rubber sheet into a blast oven with set temperature and time for second-stage vulcanization; and after the second-stage vulcanization is finished, taking out the vulcanized rubber sheet to obtain a final product.
The invention has the beneficial effects that:
the borosilicate rubber can be prepared into two types of flexible borosilicate rubber sheets without foam holes and flexible borosilicate rubber foam cushions with foam holes according to different application scenes, and has the characteristics of softness, smoothness, high tensile strength and continuous extrusion molding. According to different application scenes, materials with different H and B contents are prepared and used for shielding radiation neutrons with different energy levels, and the neutron shielding rate of the borosilicate rubber can reach more than 99.9% no matter for fast neutrons, intermediate energy neutrons or slow neutrons. Due to the excellent neutron shielding rate and good flexibility, the neutron shielding material can be widely applied to a spallation neutron source, nuclear facility pipeline neutron protection and neutron radiation field personnel protection. Meanwhile, the preparation of the material can be realized by hot pressing and continuous extrusion molding.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The first embodiment is as follows:
a: preparing a rubber compound: 100 parts of 110 silica crude rubber, 20 parts of fumed silica and 5 parts of B are sequentially added into a kneader 4 And C, closing the upper cover of the powder body, opening the kneading machine for about 60 minutes, and opening the kneading machine to heat the material when the inorganic powder body is completely compatible with the 110 silicon crude rubber. When the temperature of the material reaches (120 +/-10) DEG C, starting the kneader and vacuumizing to more than 0.75 MPa.s, extracting for (60 +/-30) minutes, stopping vacuumizing and heating, opening the upper cover of the kneader, naturally cooling to room temperature, and taking out the kneaded mixed rubber material;
b: mixing the rubber materials: and (3) putting the kneaded mixed rubber material on a roller of a two-roller rubber mixing mill, repeatedly rolling to remove air bubbles in the rubber material, repeatedly mixing for 10 times, adding 1.5 parts of BPO and 2 parts of DCP, and mixing for 6-8 times again. High speed roller spacing, and the thickness of the film reaches about 3.5 mm. Taking the film off the roller completely, placing the film on a clean stainless steel plate, cutting the film according to the size of a vulcanization mold frame, placing the cut film into the mold frame, and covering an upper cover of the mold frame;
c: first-stage vulcanization molding: putting the vulcanization mold frame with the rubber sheet into a flat vulcanizing machine, setting the vulcanization temperature to be 115 ℃, the pressure to be 65MPa and the vulcanization time to be 5 minutes, and starting the vulcanizing machine to carry out hot-pressing vulcanization molding; after the vulcanization is finished, taking out the mold frame, opening the upper cover and taking out the molded rubber sheet;
d: and (3) secondary vulcanization molding: and (3) putting the first-stage vulcanized rubber sheet into a blast oven with set temperature and time of 160 ℃ and 30 minutes respectively, performing second-stage vulcanization, and taking out the vulcanized rubber sheet after the second-stage vulcanization is finished to obtain a final product.
Example two
A: preparing a rubber compound: 100 parts of 110 silica raw rubber, 30 parts of fumed silica and 30 parts of B are sequentially added into a kneader 4 C, closing the upper cover of the powder body, starting kneading for about 60 minutes, and starting the kneading machine to heat the material when the inorganic powder body is completely compatible with the 110 silicon crude rubber; when the temperature of the material reaches (120 +/-10) DEG C, starting a kneader to vacuumize to more than 0.75 MPa.s, extracting for (60 +/-30) minutes, stopping vacuuming and heating, opening an upper cover of the kneader, naturally cooling to room temperature, and taking out the kneaded mixed rubber material;
b: mixing the rubber materials: putting the kneaded mixed rubber material on a roller of a two-roller rubber mixing mill, repeatedly rolling to remove bubbles in the rubber material, repeatedly mixing for 10 times, adding 3 parts of foaming agent H, 1 part of BPO and 0.5 part of DCP, and mixing for 6-8 times again; the roller spacing is high, the thickness of the film reaches about 3.5mm, the film is completely taken down from the roller and placed on a clean stainless steel plate, the film is cut according to the size of a vulcanization die frame and placed in the die frame, and an upper cover of the die frame is covered;
c: first-stage vulcanization molding: putting the vulcanization mold frame with the rubber sheet into a flat vulcanizing machine, setting the vulcanization temperature at 120 ℃, the pressure at 65MPa and the vulcanization time for 10 minutes, starting the vulcanizing machine to perform hot-pressing vulcanization molding, taking out the mold frame after the vulcanization is finished, opening the upper cover, and taking out the molded rubber sheet;
d: and (3) secondary vulcanization molding: and (3) putting the first-stage vulcanized formed rubber sheet into a blast oven with set temperature and time of 160 ℃ and 30 minutes respectively, and performing second-stage vulcanization. And after the second-stage vulcanization is finished, taking out the vulcanized rubber sheet to obtain a final product.
Example three:
a: preparing a rubber compound: 100 parts of 110 silica gel, 40 parts of fumed silica and 80 parts of B are sequentially added into a kneader 4 C, closing the upper cover of the powder body, opening the kneading machine for about 60 minutes, and opening the kneading machine to heat the material when the inorganic powder body is completely compatible with the 110 silicon crude rubber; when the temperature of the material reaches (120 + -10) deg.C, starting the kneader and vacuum to 0.75 MPa.s or more, extracting (60 + -30) minAfter the kneading, stopping vacuum and heating, opening the upper cover of the kneader, naturally cooling to room temperature, and taking out the kneaded mixed rubber material;
b: mixing the rubber materials: putting the kneaded mixed rubber material on a roller of a two-roller rubber mixing machine, repeatedly rolling to remove air bubbles in the rubber material, repeatedly mixing for 10 times, adding 3 parts of BPO and 1 part of bis-penta vulcanizing agent, and mixing for 6-8 times again; the roller spacing is high, so that the thickness of the film reaches about 3.5 mm; taking the film off the roller completely, placing the film on a clean stainless steel plate, cutting the film according to the size of a vulcanization mold frame, placing the cut film into the mold frame, and covering an upper cover of the mold frame;
c: first-stage vulcanization molding: putting the vulcanization mold frame with the rubber sheet into a flat vulcanizing machine, and setting the vulcanization temperature at 120 ℃, the pressure at 65MPa and the vulcanization time for 10 minutes; starting a vulcanizing machine to carry out hot-pressing vulcanization molding, taking out the mold frame after vulcanization is finished, opening the upper cover, and taking out the molded rubber sheet;
d: and (3) secondary vulcanization molding: and (3) putting the first-stage vulcanized rubber sheet into a blast oven with set temperature and time of 160 ℃ and 30 minutes respectively, performing second-stage vulcanization, and taking out the vulcanized rubber sheet after the second-stage vulcanization is finished to obtain a final product.
Example four:
a: preparing a rubber compound: 100 parts of 110 silica crude rubber, 45 parts of fumed silica and 100 parts of B are added into a kneader in sequence 4 C, closing the upper cover of the powder body, starting kneading for about 60 minutes, and starting the kneading machine to heat the material when the inorganic powder body is completely compatible with the 110 silicon crude rubber; when the temperature of the material reaches (120 +/-10) DEG C, starting the kneader and vacuumizing to more than 0.75 MPa.s, extracting for (60 +/-30) minutes, stopping vacuumizing and heating, opening the upper cover of the kneader, naturally cooling to room temperature, and taking out the kneaded mixed rubber material;
b: mixing the rubber materials: putting the kneaded mixed rubber material on a roller of a two-roller rubber mixing mill, repeatedly rolling to remove bubbles in the rubber material, repeatedly mixing for 10 times, adding 1 part of foaming agent AC, 6 parts of BPO and 0.5 part of DCP, and mixing for 6-8 times again; the roller spacing is high, the thickness of the film reaches about 3.5mm, the film is completely taken down from the roller and placed on a clean stainless steel plate, the film is cut according to the size of a vulcanization mold frame and placed in the mold frame, and an upper cover of the mold frame is covered;
c: first-stage vulcanization molding: and (3) putting the vulcanization mold frame with the rubber sheet into a flat vulcanizing machine, setting the vulcanization temperature to be 120 ℃, the pressure to be 65MPa and the vulcanization time to be 10 minutes, starting the vulcanizing machine to perform hot-pressing vulcanization molding, taking out the mold frame after the vulcanization is finished, opening the upper cover, and taking out the molded rubber sheet.
D: and (3) secondary vulcanization molding: and (3) putting the first-stage vulcanized formed film into a blast oven with set temperature and time of 160 ℃ and 30 minutes respectively, performing second-stage vulcanization, and taking out the vulcanized film after the second-stage vulcanization is finished to obtain a final product.
The borosilicate rubber of the embodiment is prepared into two types of non-cellular flexible borosilicate silicone rubber sheets and cellular flexible borosilicate rubber foam cushion materials according to different application scenes; and according to different application scenes, materials with different H and B contents are prepared and used for neutron shielding in different energy levels, and the neutron shielding rate of the borosilicate rubber can reach more than 99.9% no matter for fast neutrons, intermediate energy neutrons or slow neutrons.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims. It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition. In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (2)
1. The organic silicon rubber with bendable and foldable high neutron shielding efficiency is characterized by comprising the following components in parts by weight:
100 parts of 110 silicon crude rubber, 20-45 parts of fumed silica and B 4 C5-100 parts, vulcanizing agent 0.5-6.5 parts and foaming agent 1-6 parts;
the foaming agent is one or more of sodium bicarbonate, a foaming agent H, a foaming agent F-36, a foaming agent AC, a foaming agent OBSH and a foaming agent AK;
the vulcanizing agent is one or more of BPO, Biediwu and DCP;
b is described 4 C is nuclear grade powder.
2. The preparation method of the bendable and foldable high neutron shielding-effect silicone rubber as claimed in claim 1, wherein the preparation method comprises the following steps:
a: preparing a rubber compound: adding 110 silicon crude rubber, fumed silica and B into a kneader in sequence according to the proportion 4 C, closing the upper cover and opening the kneading machine to knead the powder; kneading for 60 minutes, and after the inorganic powder and the 110 silicon crude rubber are completely fused, starting the kneading machine to heat the material; when the temperature of the material reaches 120 +/-10 ℃, starting a kneader and vacuumizing to more than 0.75 MPa.s, extracting for 60 +/-30 minutes, stopping vacuumizing and heating, opening an upper cover of the kneader, naturally cooling to room temperature, and taking out the kneaded mixed rubber material;
b: mixing the rubber materials: putting the kneaded mixed rubber material on a roller of a two-roller rubber mixing mill, repeatedly rolling to remove air bubbles in the rubber material, repeatedly mixing for 10 times, adding a foaming agent and a vulcanizing agent, and mixing for 6-8 times again; the roller spacing is high, the thickness of the film reaches 3.5 +/-0.1 mm, the film is completely taken down from the roller and placed on a clean stainless steel plate, the film is cut according to the size of a vulcanization mold frame and placed in the mold frame, and an upper cover of the mold frame is covered;
c: first-stage vulcanization molding: putting the vulcanization mold frame with the rubber sheet into a flat vulcanizing machine, setting vulcanization temperature, pressure and vulcanization time, starting the vulcanizing machine for hot-press vulcanization molding, taking out the mold frame after vulcanization is finished, opening the upper cover, and taking out the molded rubber sheet;
d: and (3) secondary vulcanization molding: putting the first-stage vulcanized molding rubber sheet into a blast oven with set temperature and time for second-stage vulcanization; and after the second-stage vulcanization is finished, taking out the vulcanized rubber sheet to obtain a final product.
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