CN114854107B - Oil-resistant low-temperature-resistant rubber material and preparation method and application thereof - Google Patents
Oil-resistant low-temperature-resistant rubber material and preparation method and application thereof Download PDFInfo
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- CN114854107B CN114854107B CN202210482637.3A CN202210482637A CN114854107B CN 114854107 B CN114854107 B CN 114854107B CN 202210482637 A CN202210482637 A CN 202210482637A CN 114854107 B CN114854107 B CN 114854107B
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/02—Copolymers with acrylonitrile
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- 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
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- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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Abstract
The invention belongs to the technical field of oil-resistant rubber materials, and particularly relates to an oil-resistant low-temperature-resistant rubber material, and a preparation method and application thereof. According to the invention, two kinds of nitrile rubber with different acrylonitrile contents are reasonably proportioned, and the cold-resistant plasticizer is adopted to further improve the low temperature resistance of the rubber sealing ring, so that the prepared rubber sealing ring has excellent oil resistance, low temperature resistance, tensile resistance and compression resistance, the low-temperature brittleness can reach below-40 ℃, and the use value of the rubber sealing ring can be ensured in winter severe cold areas such as Xinjiang, northeast China, shanghai Russia, nordic and the like.
Description
Technical Field
The invention belongs to the technical field of oil-resistant rubber materials. More particularly, relates to an oil-resistant low-temperature-resistant rubber material, and a preparation method and application thereof.
Background
The rubber is a high-elasticity polymer material, has excellent elasticity at room temperature, can generate larger deformation under the action of small external force, and can recover after the external force is removed. When rubber is placed in various pipelines and valves for connection, the sealing effect is excellent, and the rubber is often manufactured into a sealing ring.
The conventional sealing ring is required to have high tensile property, ageing resistance, low compression set and low compression stress relaxation, so that the sealing ring is generally prepared from natural rubber and Ethylene Propylene Diene Monomer (EPDM), but the sealing ring does not have oil resistance and low temperature resistance, and in special fields with extremely high requirements on oil resistance, such as gas pipelines, oil delivery pipes and the like, the sealing ring is slightly careless, and flammable and explosive gas and oil can cause life and property safety problems; meanwhile, in areas such as Xinjiang, northeast and the like in China, areas such as Russian, nordic and the like in overseas are severe cold in winter, and the rubber is required to have excellent low temperature resistance, so that the rubber is still sealed in a low-temperature environment. Therefore, the rubber sealing ring with ageing resistance, deformation resistance, oil resistance and low temperature resistance is widely paid attention to.
Oil resistance and low temperature resistance are contradictory properties, and improvement of one property means sacrifice of the other property. In order to improve oil resistance and low temperature resistance, raw materials such as hydrogenated nitrile, fluorosilicone, nitrile rubber and the like are usually added into a formula, and the higher the acrylonitrile content in the nitrile rubber is, the more excellent the oil resistance is, but the worse the low temperature resistance is, and the oil resistance and the low temperature resistance are still important problems. For example, china discloses a high-performance nitrile rubber material which has the characteristics of oil resistance, low temperature resistance, wear resistance, heat resistance and ozone resistance, but adopts polar nitrile rubber and nonpolar silica gel for blending, has poor compatibility, is not ideal in low temperature resistance, has Tg of more than-20.3 ℃ and cannot be applied to severe cold areas.
Disclosure of Invention
The invention aims to overcome the defect and the defect that the existing rubber sealing ring cannot have excellent oil resistance and low temperature resistance at the same time, and provides an oil-resistant low temperature-resistant rubber material.
The invention aims to provide a preparation method of an oil-resistant low-temperature-resistant rubber material.
The invention further aims to provide an oil-resistant low-temperature-resistant rubber sealing ring.
The invention further aims to provide a preparation method of the oil-resistant low-temperature-resistant rubber sealing ring.
The invention further aims to provide application of the oil-resistant low-temperature-resistant rubber sealing ring in a gas pipeline, a gas valve and a gas stove.
The above object of the present invention is achieved by the following technical solutions:
an oil-resistant and low-temperature-resistant rubber material comprises the following components in parts by weight:
the content of acrylonitrile in the first nitrile rubber is 32% -35%, and the content of acrylonitrile in the second nitrile rubber is 26% -29%;
the first auxiliary agent comprises an active agent, a dispersing agent and an anti-aging agent, and the second auxiliary agent comprises an accelerator and a vulcanizing agent.
Preferably, the weight part ratio of the first nitrile rubber to the second nitrile rubber is 1: (1.5-2.3).
The acrylonitrile content of the first nitrile rubber is more than 31%, and the first nitrile rubber has good oil resistance but poor low temperature resistance; the second nitrile rubber has an acrylonitrile content of 30% or less, and has poor oil resistance but good low temperature resistance. According to the invention, two kinds of nitrile rubber with different acrylonitrile contents are adopted for matching in different proportions, so that the prepared rubber sealing ring can simultaneously consider oil resistance and low temperature resistance.
Preferably, the difference between the acrylonitrile content of the first nitrile rubber and the acrylonitrile content of the second nitrile rubber is 3% or more.
More preferably, the difference between the acrylonitrile content of the first nitrile rubber and the acrylonitrile content of the second nitrile rubber is 8% or more, specifically 8 to 9%.
Preferably, the carbon black is one or more of a fast extrusion furnace black or a semi-reinforcing furnace black.
Specifically, the compressed sample oil absorption value of the fast extrusion furnace black is 70-120 multiplied by 10 -5 m 3 Specific surface area of hexadecyl trimethyl ammonium bromide (CTAB) adsorption is 35-85X 10 3 m 2 /kg。
Specifically, the compressed sample oil absorption value of the semi-reinforcing furnace black is 50-80 multiplied by 10 -5 m 3 Per kg, CTAB adsorption specific surface area of 20-45 x 10 3 m 2 /kg。
The particle size of the fast extrusion furnace black is small, the reinforcing performance is good, and the physical properties of the rubber sealing ring such as hardness and tensile strength can be improved; the semi-reinforcing furnace black has large particle size and poor reinforcing performance, and can reduce the content of nitrile rubber in a formula system, thereby improving the oil resistance of the rubber sealing ring.
Preferably, the inorganic filler is one or more of light calcium carbonate, heavy calcium carbonate or clay.
Preferably, the cold-resistant plasticizer is one or more of dioctyl adipate, dioctyl sebacate or di (butoxyethoxyethyl) adipate.
Specifically, the first auxiliary agent comprises the following components in parts by weight:
5-8 parts of active agent
1 to 5 parts of dispersing agent
2 to 6 portions of anti-aging agent
Preferably, the active agents are zinc oxide and stearic acid.
More preferably, the zinc oxide is one or more of indirect zinc oxide, nano zinc oxide or active zinc oxide.
Preferably, the dispersant is a saturated fatty acid ester dispersant.
Preferably, the anti-aging agent is a ketoamine anti-aging agent, a p-phenylenediamine anti-aging agent, and a protective wax.
More preferably, the ketoamine antioxidant is one or both of an antioxidant RD or an antioxidant AW.
More preferably, the p-phenylenediamine anti-aging agent is one or both of anti-aging agent 4010NA or anti-aging agent 4020.
Specifically, the second auxiliary agent comprises the following components in parts by weight:
2 to 5 portions of accelerator
0-1 part of vulcanizing agent.
Preferably, the accelerators are sulfenamide accelerators and thiuram accelerators.
More preferably, the sulfenamide accelerator is one or more of accelerator DZ, accelerator CZ or accelerator NS.
More preferably, the thiuram accelerator is one or both of accelerator TMTD or accelerator DPTT.
Preferably, the vulcanizing agent is sulfur.
The invention further provides a preparation method of the oil-resistant low-temperature-resistant rubber material, which comprises the following steps:
s1, mixing the first nitrile rubber, the second nitrile rubber and the first auxiliary agent according to the dosage, adding carbon black according to the dosage for mixing, adding inorganic filler and cold-resistant plasticizer according to the dosage, mixing and discharging rubber at 150-160 ℃ to obtain master batch;
s2, cooling the masterbatch obtained in the step S1, and mixing the masterbatch with a second auxiliary agent according to the amount at 90-100 ℃ again to discharge rubber.
The invention further protects an oil-resistant low-temperature-resistant rubber sealing ring, which is prepared from the oil-resistant low-temperature-resistant rubber material.
The invention further provides a preparation method of the oil-resistant low-temperature-resistant rubber sealing ring, which comprises the following steps:
s1, mixing the first nitrile rubber, the second nitrile rubber and the first auxiliary agent according to the amount, adding carbon black for mixing, adding inorganic filler and cold-resistant plasticizer according to the amount, mixing and discharging rubber at 150-160 ℃ to obtain master batch;
s2, cooling the masterbatch obtained in the step S1, mixing the masterbatch with a second auxiliary agent again according to the dosage at 90-100 ℃ to obtain final rubber, and then sequentially carrying out sheet discharging, cooling, molding and vulcanization to obtain the finished rubber.
Preferably, in the step S2, the temperature of the molding and vulcanizing is 160-170 ℃ and the time is 6-10 min.
Preferably, in step S1, the total time of the kneading is 5 to 8 minutes.
Preferably, in step S2, the kneading time is 90S to 120S.
The invention further protects application of the oil-resistant low-temperature-resistant rubber sealing ring in a gas pipeline, a gas valve and a gas stove.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, two kinds of nitrile rubber with different acrylonitrile contents are reasonably proportioned, and the cold-resistant plasticizer is adopted to further improve the low temperature resistance of the rubber sealing ring, so that the prepared rubber sealing ring has excellent oil resistance, low temperature resistance, tensile resistance and compression resistance, the low-temperature brittleness can reach below-40 ℃, and the use value of the rubber sealing ring can be ensured in winter severe cold areas such as Xinjiang, northeast China, shanghai Russia, nordic and the like.
Detailed Description
The present invention is further illustrated below with reference to specific examples, which are not intended to limit the invention in any way. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
Reagents and materials used in the following examples are commercially available unless otherwise specified.
The first nitrile rubber has a acrylonitrile content of 35% and a brand number of N230S, available from JSR corporation;
the first nitrile rubber has an acrylonitrile content of 34% and is available from JSR corporation under the designation N237;
the first nitrile rubber has an acrylonitrile content of 32% and a brand number of N233, available from JSR corporation;
the first nitrile rubber had an acrylonitrile content of 41.5% and was available under the designation N220S from japan JSR corporation;
the second nitrile rubber had an acrylonitrile content of 19.2% and was available under the designation N250S from japan JSR corporation;
the second nitrile rubber has a content of 26% acrylonitrile and a brand number of N240S, available from JSR corporation;
the second nitrile rubber has an acrylonitrile content of 29% and is available from JSR corporation under the designation N241;
the oil absorption value of the compressed sample of the fast extrusion furnace black is 70 to 120 multiplied by 10 -5 m 3 Per kg, CTAB adsorption specific surface area of 35-85X 10 3 m 2 Kg, available from Suzhou Baozhen carbon black Co., ltd;
the oil absorption value of the compressed sample of the semi-reinforced furnace black is 50 to 80 multiplied by 10 -5 m 3 Per kg, CTAB adsorption specific surface area of 20-45 x 10 3 m 2 Kg, available from Suzhou Baozhen carbon black Co., ltd;
the inorganic filler is light calcium carbonate, which is purchased from Jiangxi province peak calcium carbonate limited company;
the cold resistant plasticizer was di (butoxyethoxyethyl) adipate, available from Rohm & Haas, rohm;
the anti-aging agent is ketoamine anti-aging agent, p-phenylenediamine anti-aging agent and protective wax;
the active agent is zinc oxide and stearic acid;
the dispersing agent is a saturated fatty acid ester dispersing agent;
the accelerator is sulfenamide accelerator and thiuram accelerator;
the vulcanizing agent is sulfur;
before the oil-resistant low-temperature-resistant multifunctional rubber sealing ring is produced, a special washer is used for cleaning an internal mixer for one time, and a machine table is cleaned up for sanitation to prevent pollution to the rubber composition.
Example 1 preparation of oil-resistant Low-temperature-resistant multifunctional rubber seal
S1, according to parts by weight, adding 35 parts of first nitrile rubber (the content of acrylonitrile is 35%), 65 parts of second nitrile rubber (the content of acrylonitrile is 26%), 5 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of saturated fatty acid ester dispersing agent, 1 part of protective wax, 2 parts of ketoamine anti-aging agent and 2 parts of p-phenylenediamine anti-aging agent into a 75L internal mixer for mixing, adding 65 parts of fast extrusion furnace black and 53 parts of semi-reinforcing furnace black after pressing a top bolt for 40 seconds for mixing, pressing the top bolt for 100 seconds, adding 30 parts of inorganic filler and 15 parts of cold-resistant plasticizer for mixing, pressing the top bolt for 100 seconds, then lifting the top bolt for cleaning, pressing the top bolt for continuous mixing, pressing the top bolt for 130 seconds, and heating to 150 ℃ to obtain master batch;
s2, cooling the masterbatch obtained in the step S1 to below 40 ℃, adding 1.5 parts of sulfenamide accelerator, 2.5 parts of thiuram accelerator and 0.5 part of sulfur into a 75L internal mixer at the same time, carrying out final refining and mixing, pressing a top bolt for 110S, mixing to 95 ℃ and discharging rubber again to obtain final rubber (oil-resistant and low-temperature-resistant rubber material), and sequentially carrying out sheet discharging, cooling, and molding and vulcanizing at 165 ℃ for 8min to obtain the rubber.
Example 2 preparation of oil-resistant Low-temperature-resistant multifunctional rubber seal
The difference from example 1 is that the acrylonitrile content in the first nitrile rubber was 34%, the acrylonitrile content in the second nitrile rubber was 26%, and the amounts of the components added were different, the specific amounts of the added are shown in Table 1, and the conditions of the remaining steps were the same as in example 1.
Table 1: the addition amount (in parts by weight) of each component in example 2
Example 3 preparation of oil-resistant Low-temperature-resistant multifunctional rubber seal
The difference from example 1 is that the acrylonitrile content in the first nitrile rubber was 32%, the acrylonitrile content in the second nitrile rubber was 29%, and the amounts of the components added were different, the specific amounts added are shown in Table 2, and the conditions of the remaining steps were the same as in example 1.
Table 2: the addition amount (in parts by weight) of each component in example 3
Preparation of comparative example 1 multifunctional rubber seal
The difference from example 1 is that the acrylonitrile content of the first nitrile rubber is 41.5% and the reagents, amounts and conditions of the remaining steps are identical to those of example 1.
Preparation of comparative example 2 multifunctional rubber seal
The difference from example 1 is that the acrylonitrile content of the second nitrile rubber is 19.2% and the reagents, amounts and conditions of the remaining steps are the same as in example 1.
Comparative example 3 preparation of multifunctional rubber seal
The difference from example 1 is that the parts by weight of the first nitrile rubber is 25 parts, the parts by weight of the second nitrile rubber is 75 parts, and the reagents, amounts and conditions of the remaining steps are the same as those of example 1.
Comparative example 4 preparation of multifunctional rubber seal
The difference from example 1 is that no cold-resistant plasticizer is contained, only the conventional plasticizer DBP is used, and the reagents, amounts and conditions of the remaining steps are the same as those of example 1.
Preparation of comparative example 5 multifunctional rubber seal
The difference from example 1 is that the inorganic filler is not contained, the weight part of the rapidly extruded carbon black is increased to 76 parts in order to ensure consistent or small variation of hardness, and the reagents, the dosage and the conditions of the rest steps are consistent with those of example 1.
Preparation of comparative example 6 multifunctional rubber seal
The difference from example 2 is that the weight part of the inorganic filler is 80 parts, the weight part of the cold-resistant plasticizer is 30 parts, and the reagents, amounts and conditions of the rest steps are the same as those of example 1.
Experimental example 1: tensile strength test for oil-resistant low-temperature-resistant multifunctional rubber sealing ring
1. The testing method comprises the following steps:
the tensile strength of the sample is tested according to the national recommended standard of GB/T528-2009 determination of tensile stress strain properties of vulcanized rubber or thermoplastic rubber, and the tensile speed is 500mm/min.
2. Test results: as shown in table 3:
table 3: examples 1 to 3 tensile Strength of oil-resistant Low temperature-resistant multifunctional rubber seal
The tensile strength of the oil-resistant low-temperature-resistant multifunctional rubber sealing ring obtained in the embodiment 1 is 14.0MPa, the tensile strength of the multifunctional rubber sealing ring obtained in the embodiment 2 is 13.2MPa, the tensile strength of the multifunctional rubber sealing ring obtained in the embodiment 3 is 11.1MPa, and the requirements that the tensile strength is more than or equal to 10MPa in the sealing material requirements for pipelines and accessories for conveying gas fuel and hydrocarbon liquid by using GB/T23658-2009 elastomer sealing rings are met.
Experimental example 2: compression set test for oil-resistant low-temperature-resistant multifunctional rubber sealing ring
1. The testing method comprises the following steps:
determination of compression set of vulcanized rubber or thermoplastic rubber according to GB/T7759.1-2015 part 1: the sample was subjected to a permanent deformation test by compression at room temperature and high temperature under the state recommended by the state of the art, the compression amount was 15%, the compression was carried out for 72 hours at room temperature and 23 ℃ (represented by 23 ℃ C. Times.72 hours), and the compression was carried out for 24 hours at 70 ℃ C. (represented by 70 ℃ C. Times.24 hours).
Determination of compression set of vulcanized rubber or thermoplastic rubber according to GB/T7759.2-2014 part 2: the samples were subjected to the low temperature compression set test under the national recommended standard at low temperature conditions, 15% compression, and compression at-15℃for 72 hours (expressed as-15℃. Times.72 hours).
2. Test results: as shown in table 4:
table 4: examples 1 to 3 permanent deformation data of oil-resistant and Low temperature-resistant multifunctional rubber seal rings
The oil-resistant low-temperature-resistant multifunctional rubber sealing ring obtained in the embodiment 1 has the compression set of 8% at the normal temperature of 23 ℃ and 9% at the high temperature of 70 ℃; the multifunctional rubber sealing ring obtained in the embodiment 2 has the compression set of 10% at the normal temperature of 23 ℃ and the compression set of 13% at the high temperature of 70 ℃; the multifunctional rubber sealing ring obtained in the embodiment 3 has the compression set of 13% at the normal temperature of 23 ℃ and 11% at the high temperature of 70 ℃, and meets the requirements of 15% or less of compression set at the normal temperature of 23 ℃ and 20% or less of compression set at the high temperature of 70 ℃ corresponding to the hardness of 80 grades in the sealing material requirement for pipelines and accessories for conveying gas fuel and hydrocarbon liquid for GB/T23658-2009 elastomer sealing rings.
The compression set of the oil-resistant low-temperature-resistant multifunctional rubber sealing ring obtained in the embodiment 1 at the low temperature of-15 ℃ is 23%, the compression set of the multifunctional rubber sealing ring obtained in the embodiment 2 at the low temperature of-15 ℃ is 25%, and the compression set of the multifunctional rubber sealing ring obtained in the embodiment 3 at the low temperature of-15 ℃ is 20%, so that the requirements of enterprise standard low-temperature compression set of less than or equal to 60% are met.
Experimental example 3: compression stress relaxation test for oil-resistant low-temperature-resistant multifunctional rubber sealing ring
1. The testing method comprises the following steps:
the test time is 90d according to the national recommended standard of GB/T1685-2008 test of stress relaxation of vulcanized rubber or thermoplastic rubber at normal temperature and high temperature, wherein the test is carried out on the sample at normal temperature and 23 ℃.
2. Test results: as shown in table 5:
table 5: examples 1 to 3 oil-resistant Low temperature-resistant multifunctional rubber seal compression stress relaxation data
The oil-resistant low-temperature-resistant multifunctional rubber sealing ring obtained in the embodiment 1 has 17% of 23 ℃ multiplied by 90d compressive stress relaxation, the multifunctional rubber sealing ring obtained in the embodiment 2 has 18% of 23 ℃ multiplied by 90d compressive stress relaxation, and the multifunctional rubber sealing ring obtained in the embodiment 3 has 20% of 23 ℃ multiplied by 90d compressive stress relaxation, which all meet the requirement of 23 ℃ multiplied by 90d compressive stress relaxation test less than or equal to 22% in the sealing material requirement of GB/T23658-2009 elastomer sealing ring for pipelines and accessories for conveying gas fuel and hydrocarbon liquid.
Experimental example 4: oil resistance test of oil-resistant low-temperature-resistant multifunctional rubber sealing ring
1. The testing method comprises the following steps:
the oil resistance test is carried out on the sample according to the national recommended standard of GB/T1690-2010 vulcanized rubber or thermoplastic rubber liquid resistance test method, the oil is liquid B (30% toluene, 70% isooctane), the sample is a type I sample, the thickness is 2mm, the full immersion mode is adopted, the volume change rate is firstly tested by immersing for 168 hours at 23 ℃ and is expressed by 23 ℃ multiplied by 168 hours, and then the volume change rate is tested again after drying for 96 hours at 70 ℃ and is expressed by 70 ℃ multiplied by 96 hours.
2. Test results: as shown in table 6:
table 6: volume change rate data of oil-resistant low-temperature-resistant multifunctional rubber seal rings of examples 1 to 3 and multifunctional rubber seal rings obtained in comparative examples 1 to 6
The volume change rate of the oil-resistant low-temperature-resistant multifunctional rubber sealing ring obtained in the embodiment 1 at 23 ℃ is 22%, and then the oil-resistant low-temperature-resistant multifunctional rubber sealing ring is dried at 70 ℃ for 96 hours to obtain the oil-resistant low-temperature-resistant multifunctional rubber sealing ring with the volume change rate of-8%; the volume change rate of the multifunctional rubber sealing ring obtained in the embodiment 2 at 23 ℃ is 23%, and then the multifunctional rubber sealing ring is dried at 70 ℃ for 96 hours, wherein the volume change rate is-9%; the volume change rate of the multifunctional rubber sealing ring obtained in the embodiment 3 at 23 ℃ is 29%, and then the multifunctional rubber sealing ring is dried at 70 ℃ for 96 hours, wherein the volume change rate is-10%;
the volume change rate of the multifunctional rubber sealing ring obtained in the comparative example 1 at 23 ℃ is 20%, and then the volume change rate of the multifunctional rubber sealing ring after drying at 70 ℃ for 96 hours is-7%; the volume change rate of the multifunctional rubber sealing ring obtained in the comparative example 2 at 23 ℃ is 38%, and then the volume change rate of the multifunctional rubber sealing ring after drying at 70 ℃ for 96 hours is-15%; the volume change rate of the multifunctional rubber sealing ring obtained in the comparative example 3 at 23 ℃ is 31%, and then the multifunctional rubber sealing ring is dried for 96 hours at 70 ℃ and the volume change rate is-13%; the volume change rate of the multifunctional rubber sealing ring obtained in the comparative example 4 at 23 ℃ is 25%, and then the volume change rate of the multifunctional rubber sealing ring after drying at 70 ℃ for 96 hours is-12%; the volume change rate of the multifunctional rubber sealing ring obtained in the embodiment 5 at 23 ℃ is 33%, and then the multifunctional rubber sealing ring is dried at 70 ℃ for 96 hours, wherein the volume change rate is-11%; the volume change rate of the multifunctional rubber sealing ring obtained in the example 6 at 23 ℃ is 27%, and then the volume change rate of the multifunctional rubber sealing ring after drying at 70 ℃ for 96 hours is-12%.
The oil-resistant low-temperature-resistant multifunctional rubber sealing rings obtained in the embodiment 1, the embodiment 2, the embodiment 3 and the comparative embodiment 1 meet the requirements that the volume change rate of 80-grade hardness is less than or equal to 30 percent and the volume change rate of re-drying at 70 ℃ for 96 hours is more than or equal to-10 percent in the sealing material requirement for pipelines and accessories for conveying gas fuel and hydrocarbon liquid of GB/T23658-2009 elastomer sealing rings. Comparative examples 2 to 6 do not satisfy the above.
Experimental example 5: low-temperature brittleness test for oil-resistant low-temperature-resistant multifunctional rubber sealing ring
1. The testing method comprises the following steps:
the low-temperature brittleness test is carried out on the sample according to the national recommended standard of the single sample method for measuring low-temperature brittleness of vulcanized rubber of GB/T1682-2014, and the test temperature is minus 40 ℃.
2. Test results: as shown in table 7:
table 7: low-temperature brittleness data of the oil-resistant and low-temperature-resistant multifunctional rubber seal rings of examples 1 to 3 and the multifunctional rubber seal rings obtained in comparative examples 1 to 6
The oil-resistant low-temperature-resistant multifunctional rubber sealing ring obtained in the embodiment 1 is free from damage, the multifunctional rubber sealing ring obtained in the embodiment 2 is free from damage, and the multifunctional rubber sealing ring obtained in the embodiment 3 is free from damage;
the multifunctional rubber seal ring obtained in the comparative example 1 is damaged, the multifunctional rubber seal ring obtained in the comparative example 2 is not damaged, the multifunctional rubber seal ring obtained in the comparative example 3 is not damaged, the multifunctional rubber seal ring obtained in the comparative example 4 is damaged, the multifunctional rubber seal ring obtained in the comparative example 5 is not damaged, and the multifunctional rubber seal ring obtained in the comparative example 6 is damaged.
The oil-resistant low-temperature-resistant multifunctional rubber sealing rings obtained in the embodiment 1, the embodiment 2, the embodiment 3, the comparative example 2, the comparative example 3 and the comparative example 5 meet the requirement of no damage in low-temperature brittleness-40 test in GB/T23658-2009 elastomer sealing ring for pipelines and accessories for conveying gas fuel and hydrocarbon liquid. Comparative example 1, comparative example 4, comparative example 6 are not satisfied.
In summary, the oil-resistant and low-temperature-resistant multifunctional rubber sealing rings obtained in the embodiment 1, the embodiment 2 and the embodiment 3 meet the requirements of all test items with the hardness of 80 grades in the sealing material requirements for pipelines and accessories for conveying gas fuel and hydrocarbon liquid of GB/T23658-2009 elastomer sealing rings. Only the oil-resistant low-temperature-resistant multifunctional rubber sealing ring obtained in the embodiments 1-3 can simultaneously meet the oil-resistant and low-temperature-resistant functions.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (8)
1. The oil-resistant low-temperature-resistant rubber material is characterized by comprising the following components in parts by weight:
30-40 parts of first nitrile rubber
60-70 parts of second nitrile rubber
110-130 parts of carbon black
20-40 parts of inorganic filler
10-25 parts of cold-resistant plasticizer
9-20 parts of a first auxiliary agent
3-6 parts of a second auxiliary agent
The content of acrylonitrile in the first nitrile rubber is 32% -35%, and the content of acrylonitrile in the second nitrile rubber is 26% -29%; the difference between the acrylonitrile content of the first nitrile rubber and the acrylonitrile content of the second nitrile rubber is 8-9%;
the first auxiliary agent comprises an active agent, a dispersing agent and an anti-aging agent, and the second auxiliary agent comprises an accelerator and a vulcanizing agent.
2. The oil-resistant and low-temperature-resistant rubber material according to claim 1, wherein the weight ratio of the first nitrile rubber to the second nitrile rubber is 1: (1.5-2.3).
3. The oil and low temperature resistant rubber material according to claim 1, wherein the carbon black is one or more of a fast extrusion furnace black or a semi-reinforcing furnace black.
4. The oil-resistant and low-temperature-resistant rubber material according to claim 1, wherein the cold-resistant plasticizer is one or more of dioctyl adipate, dioctyl sebacate or di (butoxyethoxyethyl) adipate.
5. An oil-resistant low-temperature-resistant rubber sealing ring is characterized by being prepared from the oil-resistant low-temperature-resistant rubber material according to any one of claims 1-4.
6. The method for preparing the oil-resistant and low-temperature-resistant rubber sealing ring as claimed in claim 5, which is characterized by comprising the following steps:
s1, mixing a first nitrile rubber, a second nitrile rubber and a first auxiliary agent according to the amount, adding carbon black for mixing, adding an inorganic filler and a cold-resistant plasticizer according to the amount, and mixing and discharging rubber at 150-160 ℃ to obtain master batch;
s2, cooling the masterbatch obtained in the step S1, mixing the masterbatch with a second auxiliary agent according to the dosage at 90-100 ℃ again, discharging rubber to obtain final rubber, and sequentially performing sheet discharging, cooling, molding and vulcanization to obtain the finished rubber.
7. The method according to claim 6, wherein in the step S2, the temperature of the molding vulcanization is 160 ℃ to 170 ℃ and the time is 6min to 10min.
8. The application of the oil-resistant low-temperature-resistant rubber sealing ring in a gas pipeline, a gas valve and a gas stove is disclosed in claim 5.
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| CN109983069A (en) * | 2016-11-24 | 2019-07-05 | 株式会社普利司通 | Hose rubber composition and hose |
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| US4849478A (en) * | 1984-08-21 | 1989-07-18 | Japan Synthetic Rubber Co., Ltd. | Oil-resistant rubber composition |
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