CN110540712A - Large sealing ring sizing material for wind tunnel and preparation method thereof - Google Patents
Large sealing ring sizing material for wind tunnel and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention provides a large sealing ring rubber material for a wind tunnel and a preparation method thereof, belonging to the technical field of rubber materials. The preparation raw materials of the rubber compound comprise: ethylene propylene diene monomer, neoprene, fast extrusion carbon black, light calcium carbonate, Qiangwei powder, barium sulfate, white carbon black, a silane coupling agent, a plasticizer, an active agent, an accelerant and sulfur. According to the invention, chloroprene rubber and ethylene propylene diene monomer rubber are used as a rubber matrix, and a plurality of reinforcing fillers, plasticizers, active agents, accelerators and vulcanization aids are added, so that the high-low temperature resistance and water resistance of the rubber are improved, the hardness, wear resistance and tensile resistance of the rubber are improved, the fatigue life of the large sealing ring for the wind tunnel in a severe environment is greatly prolonged, the preparation method is simple and efficient, and the obtained rubber has good plasticity and processability.
Description
Technical Field
The invention relates to the technical field of rubber materials, in particular to a large sealing ring rubber material for a wind tunnel and a preparation method thereof.
Background
the wind tunnel is a pipeline-shaped experimental device which is used for generating and controlling airflow in an artificial mode, simulating the flowing condition of air around an aircraft body, measuring the effect of the airflow on the aircraft and observing the physical change of the aircraft, and is one of the most common and effective tools for aerodynamic experiments. With the rapid development of aerospace technologies in China, more types of wind tunnels have been put into construction, such as hypersonic wind tunnels, low-temperature wind tunnels, heating wind tunnels and the like, and even one wind tunnel needs to meet various test requirements of high-temperature and low-temperature modulation. For example, in a large wind tunnel built in Harbin, a designed tunnel body main body framework is formed by splicing cement precast slabs, gaps between the precast slabs are sealed by sealing rings, but the use environment temperature of the sealing rings changes from-50 ℃ to 50 ℃, the environment high-temperature and low-temperature changes are large, condensed water is generated in the wind tunnel, and the requirement on the long-term sealing performance of the sealing rings is high.
due to the structural requirements of a large wind tunnel main body, a plurality of included angles of 8 degrees, 21 degrees, 90 degrees, 136 degrees, 158 degrees, 180 degrees and the like exist in the splicing of the cement prefabricated plates, so that the rubber material adopted for preparing the sealing ring has good processing performance, and can be processed into sealing ring parts with various shapes to be used for filling the included angles among the cement prefabricated plates; after the wind tunnel is built, the sealing ring rubber part needs to have the characteristics of long-term high and low temperature resistance and environmental aging resistance, and also needs to have excellent mechanical properties so as to meet the working state of the wind tunnel and various pulling and extruding changes of gaps of cement boards. In order to meet the various conditions and combine the overall design requirements of wind tunnels at home and abroad, researchers specially research and develop the large sealing ring rubber material for the wind tunnels.
Disclosure of Invention
In view of the above, the invention aims to provide a large sealing ring rubber material for a wind tunnel and a preparation method thereof, the sealing ring rubber material provided by the invention has good weather resistance, mechanical property, thermoplasticity and process processability, and a rubber material part can be used in an environment with high and low temperature alternation and repeated external force strain for a long time.
In order to achieve the above object, the present invention provides the following technical solutions:
The invention provides a large sealing ring rubber material for a wind tunnel, which comprises the following raw materials in parts by weight:
Preferably, the ethylene propylene diene monomer is a mixture of EPDM6250, EPDM4551A and EPDM4045, and the mass ratio of the EPDM6250, the EPDM4551A and the EPDM4045 in the mixture is 60-70: 40-50: 20-30.
Preferably, the neoprene adhesive includes at least one of CR121, CR232, and CR 244.
Preferably, the plasticizer comprises paraffin oil, o-dibutyl ester and PE wax; the mass ratio of the paraffin oil to the o-dibutyl ester to the PE wax is 35-45: 10-20: 5-10.
Preferably, the active agents include stearic acid, zinc oxide and magnesium oxide; the mass ratio of the stearic acid to the zinc oxide to the magnesium oxide is 2.5-5: 10-20: 4 to 10.
Preferably, the promoters include promoter CZ, promoter M, promoter TT and promoter BZ; the mass ratio of the promoter CZ to the promoter M to the promoter TT to the promoter BZ is 1.5-3: 0.7-1.5: 2.5-5.
the invention provides a preparation method of a large sealing ring rubber material for a wind tunnel, which comprises the following steps:
(1) Mixing ethylene propylene diene monomer rubber and chloroprene rubber to obtain raw rubber;
(2) Adding the fast-extrusion carbon black, the light calcium carbonate, the Qiangwei powder, the barium sulfate, the white carbon black, the silane coupling agent and the plasticizer into the raw rubber for first banburying to obtain mixed raw rubber;
(3) and adding an active agent, an accelerant and sulfur into the mixed raw rubber for secondary banburying to obtain the large sealing ring rubber material for the wind tunnel.
preferably, the mixing in the step (1) is specifically: respectively passing the ethylene propylene diene monomer and the chloroprene rubber through the mixture for 3-10 times, mixing, banburying the mixture for 3-5 min at 15-25 ℃, and then passing through the mixture for 4-6 times to obtain crude rubber; the roller distance of the thin tube is less than 0.5 mm.
Preferably, the temperature of the first banburying in the step (2) is 15-25 ℃ and the time is 3-15 min.
preferably, the temperature of the second banburying in the step (3) is 15-25 ℃ and the time is 3-15 min.
Has the advantages that:
The invention provides a large sealing ring rubber material for a wind tunnel, which comprises the following raw materials in parts by weight: ethylene propylene diene monomer, neoprene, fast extrusion carbon black, light calcium carbonate, Qiangwei powder, barium sulfate, white carbon black, a silane coupling agent, a plasticizer, an active agent, an accelerant and sulfur. According to the invention, the chloroprene rubber and the ethylene propylene diene monomer rubber are used as rubber matrix, and a plurality of reinforcing fillers, plasticizers, active agents, accelerators and vulcanization aids are added, so that the high and low temperature resistance and the water resistance of the rubber are improved, the hardness, the wear resistance and the tensile resistance of the rubber are improved, and the fatigue life of the large sealing ring for the wind tunnel is greatly prolonged.
the preparation method of the rubber material for the large sealing ring for the wind tunnel provided by the invention is simple and efficient, toxic and side effects and environmental pollution are reduced in the preparation process, and the obtained rubber material has good mechanical properties and technological properties and is beneficial to secondary processing and forming of the rubber material.
The embodiment result shows that the large sealing ring rubber material for the wind tunnel, prepared by the invention, has the brittleness temperature of less than or equal to-50 ℃, the hardness (Shore A) of 50-75, the tensile strength of more than or equal to 15MPa, the elongation at break of more than or equal to 425%, the permanent deformation at break of less than or equal to 10%, good weather resistance and mechanical properties, difficult aging in high and low temperature environments and no damage to 10 ten thousand alternating loads.
Detailed Description
the invention provides a large sealing ring rubber material for a wind tunnel, which comprises the following raw materials in parts by weight:
Unless otherwise specified, the present invention has no special requirement on the source of the raw materials for preparation, and the raw materials well known to those skilled in the art can be used.
the sealing ring rubber material comprises, by weight, 120-150 parts of ethylene propylene diene monomer, preferably 130-140 parts of ethylene propylene diene monomer, and more preferably 135 parts of ethylene propylene diene monomer. In the invention, the ethylene propylene diene monomer is preferably a mixture of EPDM6250, EPDM4551A and EPDM4045, and the mass ratio of the EPDM6250, the EPDM4551A and the EPDM4045 in the mixture is preferably 60-70: 40-50: 20-30, and more preferably 65:45: 25. In the invention, the ethylene propylene diene monomer has the characteristics of lower density, good heat resistance, ozone aging resistance, corrosion resistance, cold resistance and heat-resistant water vapor corrosion resistance, and can be filled with a large amount of auxiliary materials without influencing the performance; according to the invention, three ethylene propylene diene rubbers are blended, EPDM6250 can further improve the tensile strength of the rubber material, EPDM4551A can further improve the processing manufacturability of the rubber material, and EPDM4045 can further improve the cold resistance of the rubber material.
Based on the weight of the ethylene propylene diene monomer, the raw materials for preparing the sealing ring rubber material comprise 100-120 parts of neoprene, preferably 105-115 parts of neoprene, and more preferably 110 parts of neoprene. In the present invention, the neoprene adhesive preferably includes at least one of CR121, CR232, and CR 244. In the invention, the chloroprene rubber can make up the defect of poor bonding strength of the ethylene propylene diene monomer rubber, so that the rubber material has certain viscosity, is convenient to compound with other materials, and improves the tensile resistance of the rubber material.
based on the weight of the ethylene propylene diene monomer, the raw materials for preparing the sealing ring rubber material comprise 130-140 parts of fast extrusion carbon black, and preferably 135 parts. In the invention, the particle surface of the fast extrusion carbon black is smooth, higher stiffness can be endowed to rubber materials, the extrusion speed is high, the mouth shape expansion is small, the surface of an extruded product is smooth, and the wear resistance of the rubber materials is improved.
Based on the weight of the ethylene propylene diene monomer, the raw materials for preparing the sealing ring rubber material comprise 80-90 parts of light calcium carbonate, and preferably 85 parts of light calcium carbonate. In the invention, the light calcium is also called precipitated calcium carbonate, is used for rubber filler, is an alkaline inorganic accelerator and has strong hygroscopicity; in the invention, the relative density of the light calcium carbonate is preferably 2.2-2.4.
Based on the weight of the ethylene propylene diene monomer, the raw materials for preparing the sealing ring rubber material comprise 35-45 parts of carbofuran powder, preferably 40 parts of carbofuran powder. The 325-mesh residue of the Qiangwei powder is preferably less than 2.5%, the DPG (double-stranded gas) adsorption rate is preferably 4-10%, more preferably 6-8%, the pH value is preferably 5.0-8.0, more preferably 6.5, and the sedimentation volume is preferably not less than 4.0%. In the invention, the Qiangwei powder belongs to a semi-reinforcing mineral filler, so that the rubber material is easy to process, the surface of an extruded product is smooth, the viscosity of the rubber material is improved, the stiffness of the rubber material is increased, the shrinkage rate of the rubber material is reduced, the tensile strength, the stress at definite elongation and the hardness of the rubber material are improved, and the wear resistance, the water resistance and the chemical resistance are improved.
Based on the weight of the ethylene propylene diene monomer, the raw materials for preparing the sealing ring rubber material comprise 10-15 parts of barium sulfate, and preferably 13 parts of barium sulfate. In the invention, the particle size of the barium sulfate is preferably 2.5-25 μm, more preferably 10-15 μm, and even more preferably 13 μm, and the pH value is preferably 6-8, and more preferably 7. In the invention, the barium sulfate can reduce the permanent deformation of the sizing material, improve the tearing strength of the sizing material and improve the acid corrosion resistance of the sizing material.
Based on the weight of the ethylene propylene diene monomer, the preparation raw material of the sealing ring sizing material comprises 35-45 parts of white carbon black, preferably 40 parts of white carbon black. The white carbon black is preferably LP white carbon black, the average particle size of the LP white carbon black is preferably 8-15 nm, more preferably 11nm, the surface area is preferably 200-380 m2/g, more preferably 260-320 m2/g, the relative density is preferably 2.1, the pH value is preferably 3.9-4.0, the moisture is preferably 1.0-1.5%, and the oil absorption value is preferably 1.5-2.00 cm3/g, more preferably 1.5cm 3/g. In the invention, the white carbon black can improve the hardness, the stress at definite elongation, the tensile strength, the tearing strength and the wear resistance of the rubber material.
in the invention, the fast extrusion carbon black, the light calcium carbonate, the Qiangwei powder, the barium sulfate and the white carbon black are all reinforcing fillers, and the mechanical property of a mixed rubber material formed by the ethylene propylene diene monomer rubber and the chloroprene rubber can be comprehensively and effectively improved by blending and adding the auxiliary materials.
Based on the weight of the ethylene propylene diene monomer, the raw materials for preparing the sealing ring rubber material comprise 3-7 parts of silane coupling agent, preferably 5 parts. The silane coupling agent is preferably gamma-aminopropyltriethoxysilane, and the gamma-aminopropyltriethoxysilane is preferably NQ-55 or KH-550. In the invention, the silane coupling agent is used for coupling organic macromolecules and inorganic fillers, so that the cohesiveness of the organic macromolecules and the inorganic fillers is enhanced, and the mechanical, water-resistant and anti-aging properties of the rubber material are improved.
Based on the weight of the ethylene propylene diene monomer, the raw materials for preparing the sealing ring rubber material comprise 50-70 parts of a plasticizer, preferably 60 parts. The plasticizer preferably comprises paraffin oil, o-dibutyl ester and PE wax, and the mass ratio of the paraffin oil to the o-dibutyl ester to the PE wax is preferably 35-45: 10-20: 5-10. In the invention, the plasticizer can change the processing property of the sizing material, improve the flexibility or tensile property of the sizing material, and reduce the viscosity, the temperature after stripping and the elastic modulus of the sizing material.
Based on the weight of the ethylene propylene diene monomer, the raw materials for preparing the sealing ring rubber material comprise 16.5-35 parts of an active agent, preferably 20-30 parts, and more preferably 25 parts. The activating agent preferably comprises stearic acid, zinc oxide and magnesium oxide, and the mass ratio of the stearic acid to the zinc oxide to the magnesium oxide is preferably 2.5-5: 10-20: 4 to 10, and more preferably 4:15: 7. The activator disclosed by the invention can accelerate the vulcanization speed, improve the vulcanization degree and improve the scorching performance of rubber.
based on the weight of the ethylene propylene diene monomer, the raw materials for preparing the sealing ring rubber material comprise 7.2-12.5 parts of an accelerant, and preferably 10 parts. The promoter preferably comprises a promoter CZ, a promoter M, a promoter TT and a promoter BZ, and the mass ratio of the promoter CZ to the promoter M to the promoter TT to the promoter BZ is preferably 1.5-3: 0.7-1.5: 2.5-5, and more preferably 2.2:2.2:1.1: 3.7. In the invention, the accelerator can promote the reaction between the rubber compound and the vulcanizing agent, improve the vulcanizing speed, reduce the vulcanizing temperature, shorten the vulcanizing time, reduce the consumption of the vulcanizing agent, improve the physical and mechanical properties of the rubber compound, improve the appearance quality of a product, improve the compression deformation and the heat resistance of the product and improve the operation safety.
Based on the weight of the ethylene propylene diene monomer, the raw materials for preparing the seal ring rubber material comprise 1.7-3 parts of sulfur, preferably 2.3 parts. In the invention, the relative density of the sulfur is preferably 1.96-2.07, more preferably 2, the purity is preferably equal to or more than 99%, and the granularity is preferably equal to or less than 100 meshes. In the invention, the sulfur mixed into the rubber can generate cross linking among rubber molecules through heat to form a three-dimensional network structure, thereby improving the elasticity of the rubber material.
the invention provides a preparation method of a large sealing ring rubber material for a wind tunnel, which comprises the following steps:
(1) Mixing ethylene propylene diene monomer and chloroprene rubber to obtain raw rubber;
(2) Adding the fast-extrusion carbon black, the light calcium carbonate, the Qiangwei powder, the barium sulfate, the white carbon black, the silane coupling agent and the plasticizer into the raw rubber, and carrying out first banburying to obtain mixed raw rubber;
(3) and adding an active agent, an accelerant and sulfur into the mixed raw rubber, and carrying out second banburying to obtain the large sealing ring rubber material for the wind tunnel.
In the present invention, the mixing in step (1) is specifically preferably: respectively passing the ethylene propylene diene monomer and the chloroprene rubber through the mixture for 3-10 times, mixing, banburying the mixture for 3-5 min at 15-25 ℃, and then passing through the mixture for 4-6 times to obtain crude rubber; the roller distance of the thin tube is preferably less than 0.5mm, and water cooling treatment is preferably performed during thin tube. In the present invention, the thining is preferably performed using an open mill, and the present invention has no specific requirement on the kind of the open mill. The invention mixes the ethylene propylene diene monomer and the chloroprene rubber to make up the defect of single use of the ethylene propylene diene monomer and the chloroprene rubber, improves the bonding strength of the rubber material and the processability of the ethylene propylene diene monomer and is beneficial to further compounding with other materials.
After the raw rubber is obtained, the fast extrusion carbon black, the light calcium carbonate, the Qiangwei powder, the barium sulfate, the white carbon black, the gamma-aminopropyl triethoxysilane and the plasticizer are added into the raw rubber, and the mixed raw rubber is obtained by first banburying. In the invention, preferably, the reinforcing filler (carbon black, light calcium carbonate, Qiangwei powder, barium sulfate and white carbon black) is added into the raw rubber in batches for premixing, the adding amount of each batch is preferably 20-30% of the total weight of the raw rubber, and then the silane coupling agent and the plasticizer are added for first banburying; in the invention, the temperature of the first banburying is preferably 15-25 ℃, more preferably 17 ℃, and the time is preferably 3-15 min, more preferably 5-10 min, and further preferably 7 min. The invention preferably puts the mixed crude rubber obtained by the first banburying for more than 12 hours so as to ensure that the crude rubber has uniform performance.
After the mixed crude rubber is obtained, the active agent, the accelerant and the sulfur are added into the mixed crude rubber for secondary banburying, and the large sealing ring rubber material for the wind tunnel is obtained. In the invention, the temperature of the second banburying is preferably 15-25 ℃, more preferably 17 ℃, and the time is preferably 3-15 min, more preferably 5-10 min, and further preferably 7 min. And (3) after the second banburying is finished, forming blocks and discharging the rubber, wherein the temperature of discharging the rubber is preferably not more than 90 ℃. According to the invention, the rubber material discharged from the second banburying is preferably subjected to sheet discharging, cooling and rubber pouring in sequence on an open mill. In the invention, the temperature of the water cooling machine for discharging the pieces is preferably 15 ℃, and after the pieces are cooled, eight-blade glue pouring is carried out until the color is uniform, thus obtaining the large sealing ring glue material for the wind tunnel.
The first internal mixing and the second internal mixing are preferably carried out using an internal mixer, and the internal mixer of the present invention has no particular requirement and can be an internal mixer known to those skilled in the art.
The following will describe the rubber material for large seal ring for wind tunnel and the preparation method thereof in detail with reference to the examples, but they should not be construed as limiting the scope of the invention.
Example 1
A large sealing ring rubber material for a wind tunnel comprises the following raw materials in parts by weight:
Weighing the raw materials according to the formula, respectively thinly passing EPDM6250, EPDM4551A, EPDM4045, neoprene 121 and neoprene 232 for 3 times, mixing, banburying for 3min at 17 ℃, discharging, thinly passing for 5 times on an open mill, wherein the roller distance is 0.4mm, and the flow of cooling water is maximized to obtain raw rubber;
Adding the fast-extrusion carbon black, light calcium carbonate, Qiangwei powder, barium sulfate, LP white carbon black, NQ-55, paraffin oil, o-dibutyl ester and PE wax into the raw rubber, carrying out first banburying at 17 ℃ for 5min to obtain mixed raw rubber, and standing for 13 h;
Adding stearic acid, zinc oxide, magnesium oxide, an accelerator and sulfur into the mixed raw rubber, and carrying out secondary banburying at 17 ℃ for 3 min; and (3) removing the rubber at 85 ℃ after the rubber blocks are formed, hanging and cooling after the rubber blocks are discharged from an open mill, wherein the temperature of a water cooling machine for discharging the rubber blocks is 15 ℃, and pouring the rubber by eight knives until the color is uniform to obtain the rubber material of the large sealing ring for the wind tunnel.
Example 2
A large sealing ring rubber material for a wind tunnel comprises the following raw materials in parts by weight:
weighing the raw materials according to the formula, respectively thinly passing EPDM6250, EPDM4551A, EPDM4045, neoprene 121 and neoprene 244 through the raw materials for 10 times, mixing, banburying for 5min at 17 ℃, discharging the rubber, thinly passing the raw materials through an open mill for 5 times with the roller spacing of 0.4mm, and discharging the cooling water to the maximum to obtain raw rubber;
Adding the fast-extrusion carbon black, light calcium carbonate, Qiangwei powder, barium sulfate, LP white carbon black, NQ-55, paraffin oil, o-dibutyl ester and PE wax into the raw rubber, carrying out first banburying at 17 ℃ for 5min to obtain mixed raw rubber, and standing for 13 h;
Adding stearic acid, zinc oxide, magnesium oxide, an accelerator and sulfur into the mixed raw rubber, and carrying out secondary banburying at 17 ℃ for 3 min; and (3) removing the rubber at 85 ℃ after the rubber blocks are formed, hanging and cooling after the rubber blocks are discharged from an open mill, wherein the temperature of a water cooling machine for discharging the rubber blocks is 15 ℃, and pouring the rubber by eight knives until the color is uniform to obtain the rubber material of the large sealing ring for the wind tunnel.
Example 3
A large sealing ring rubber material for a wind tunnel comprises the following raw materials in parts by weight:
Weighing the raw materials according to the formula, respectively thinly passing EPDM6250, EPDM4551A, EPDM4045, neoprene 121, neoprene 232 and neoprene 244 through the raw materials for 6 times, mixing, banburying for 5min at 17 ℃, removing the rubber, thinly passing the raw materials through an open mill for 5 times, wherein the roll spacing is 0.4mm, and the flow of cooling water is opened to the maximum to obtain raw rubber;
Adding fast-extrusion carbon black, light calcium carbonate, Qiangwei powder, barium sulfate, LP white carbon black, NQ-55, paraffin oil, o-dibutyl ester and PE wax into the raw rubber, carrying out first banburying at 17 ℃ for 3min to obtain mixed raw rubber, and standing for 13 h;
Adding stearic acid, zinc oxide, magnesium oxide, an accelerator and sulfur into the mixed raw rubber, and carrying out secondary banburying at 17 ℃ for 3 min; and (3) removing the rubber at 85 ℃ after the rubber blocks are formed, hanging and cooling after the rubber blocks are discharged from an open mill, wherein the temperature of a water cooling machine for discharging the rubber blocks is 15 ℃, and pouring the rubber by eight knives until the color is uniform to obtain the rubber material of the large sealing ring for the wind tunnel.
The large sealing ring rubber material for the wind tunnel prepared in the embodiment 1-3 is subjected to mechanical property and aging property measurement respectively, and the measurement method refers to the following steps: GB/T531.1 test method for indentation hardness of vulcanized rubber or thermoplastic rubber, GB/T528 test method for tensile stress strain of vulcanized rubber or thermoplastic rubber, GB/T5723 test sample and product size for testing vulcanized rubber or thermoplastic rubber, GB/T529 test method for tearing strength of vulcanized rubber or thermoplastic rubber, GB/T5579 test method for compression set of vulcanized rubber or thermoplastic rubber at normal temperature, high temperature and low temperature, GB/T1687 test method for temperature rise and fatigue resistance of vulcanized rubber in flexing test, and GB/T1682 test method for low temperature brittleness of vulcanized rubber, wherein the specific data are shown in Table 1.
TABLE 1 Large-sized sealing ring sizing material performance index for wind tunnel
As can be seen from Table 1, the large-scale sealing ring rubber material for the wind tunnel, which is prepared by the invention, has the brittleness temperature of less than or equal to-50 ℃, the hardness (Shore A) of 50-75, the tensile strength of more than or equal to 15MPa, the elongation at break of more than or equal to 425%, the permanent deformation at break of less than or equal to 10%, good weather resistance and mechanical properties, is not easy to age in high and low temperature environments, does not damage 10 ten thousand times of alternating load, can meet the design requirements of the large-scale sealing ring rubber material for the wind tunnel, and the rubber material part can be used in the environment with high and low temperature alternation and repeated external force.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. the large sealing ring rubber material for the wind tunnel is characterized by comprising the following components in parts by weight:
2. the sealing ring rubber material according to claim 1, wherein the ethylene propylene diene monomer is a mixture of EPDM6250, EPDM4551A and EPDM4045, and the mass ratio of the EPDM6250, the EPDM4551A and the EPDM4045 in the mixture is 60-70: 40-50: 20-30.
3. The seal ring compound as claimed in claim 1, wherein said neoprene rubber includes at least one of CR121, CR232, and CR 244.
4. the seal ring compound according to claim 1, wherein the plasticizer comprises paraffin oil, ortho-dibutyl ester, and PE wax; the mass ratio of the paraffin oil to the o-dibutyl ester to the PE wax is 35-45: 10-20: 5-10.
5. The seal ring compound as claimed in claim 1, wherein the active agent comprises stearic acid, zinc oxide and magnesium oxide; the mass ratio of the stearic acid to the zinc oxide to the magnesium oxide is 2.5-5: 10-20: 4 to 10.
6. The seal ring compound according to claim 1, wherein the accelerators include accelerator CZ, accelerator M, accelerator TT and accelerator BZ; the mass ratio of the promoter CZ to the promoter M to the promoter TT to the promoter BZ is 1.5-3: 0.7-1.5: 2.5-5.
7. The preparation method of the seal ring rubber material according to any one of claims 1 to 6, characterized by comprising the following steps:
(1) mixing ethylene propylene diene monomer rubber and chloroprene rubber to obtain raw rubber;
(2) adding the fast-extrusion carbon black, the light calcium carbonate, the Qiangwei powder, the barium sulfate, the white carbon black, the silane coupling agent and the plasticizer into the raw rubber for first banburying to obtain mixed raw rubber;
(3) And adding an active agent, an accelerant and sulfur into the mixed raw rubber for secondary banburying to obtain the large sealing ring rubber material for the wind tunnel.
8. The preparation method according to claim 7, wherein the mixing in step (1) is specifically: respectively passing the ethylene propylene diene monomer and the chloroprene rubber through the mixture for 3-10 times, mixing, banburying the mixture for 3-5 min at 15-25 ℃, and then passing through the mixture for 4-6 times to obtain crude rubber; the roller distance of the thin tube is less than 0.5 mm.
9. the preparation method according to claim 7, wherein the temperature of the first banburying in the step (2) is 15-25 ℃ and the time is 3-15 min.
10. The preparation method according to claim 7, characterized in that the temperature of the second banburying in the step (3) is 15-25 ℃ and the time is 3-15 min.
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|---|---|---|---|
| CN201910397690.1A CN110540712A (en) | 2019-05-14 | 2019-05-14 | Large sealing ring sizing material for wind tunnel and preparation method thereof |
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| CN201910397690.1A CN110540712A (en) | 2019-05-14 | 2019-05-14 | Large sealing ring sizing material for wind tunnel and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116410548A (en) * | 2023-03-30 | 2023-07-11 | 安徽中鼎密封件股份有限公司 | Preparation method of low-volatility ethylene propylene diene monomer rubber material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116410548A (en) * | 2023-03-30 | 2023-07-11 | 安徽中鼎密封件股份有限公司 | Preparation method of low-volatility ethylene propylene diene monomer rubber material |
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