Self-lubricating rubber material and preparation method thereof

Abstract

The invention discloses a self-lubricating rubber material and a preparation method thereof. The self-lubricating rubber material comprises the following raw materials in parts by mass: 80-100 parts of ethylene acrylate rubber, 2-3 parts of an anti-aging agent, 0.1-0.3 part of dioctyl phthalate, 10-20 parts of carbon black, 1-2 parts of stearic acid and 1-3 parts of a vulcanizing agent. The self-lubricating rubber material prepared by taking the ethylene acrylate rubber as a main raw material and adding auxiliary materials such as the anti-aging agent, the dioctyl phthalate, the carbon black, the stearic acid and the vulcanizing agent can realize self-lubrication in case of oil emission, has excellent oil resistance and high-temperature resistance, is suitable for occasions where oil cannot be added or is difficult to add, and has a wide application prospect. And the wear-resisting bearing can be maintained less or not during use, and is good in wear-resisting property, small in friction coefficient and long in service life.

Description

Technical Field

[0001] The invention relates to the technical field of rubber materials, and in particular to a self-lubricating rubber material and a preparation method thereof. Background Art

[0002] Traditional rubber seals have low assembly efficiency, and the dynamic seal of the seal will be worn due to friction during the working process, which seriously affects the life of the seal. The method of adding a separate oiling process in the later stage can improve the assembly difficulty and wear of the seal. The short-term effect is good, but due to the long transportation process and long-term storage, the oil applied on the surface of the seal will evaporate over a long period of time, and the assembly and sealing lubrication cannot be achieved, and the service life is poor.

[0003] Based on the above situation, the emergence of oil-emitting self-lubricating rubber sealing rings, such as self-lubricating rubber made of nitrile rubber as the base material, can effectively improve the problems of low assembly efficiency, poor sealing effect and short service life of traditional rubber sealing rings. However, the oil resistance of self-lubricating rubber based on nitrile rubber is not good, and its performance is not stable enough in some application occasions such as key parts of automobiles, which will affect the sealing effect. Summary of the invention

[0004] The main purpose of the present invention is to provide a self-lubricating rubber material and a preparation method thereof, aiming to provide a rubber material with better oil resistance for use in the sealing ring field.

[0005] To achieve the above object, the present invention provides a self-lubricating rubber material, which comprises the following raw materials in parts by weight:

[0006] 80-100 parts of ethylene acrylate rubber, 2-3 parts of antioxidant, 0.1-0.3 parts of dioctyl phthalate, 10-20 parts of carbon black, 1-2 parts of stearic acid and 1-3 parts of vulcanizing agent.

[0007] Optionally, the antioxidant includes 4,4'-bis(α,α-dimethylbenzyl)diphenylamine.

[0008] Optionally, the vulcanizing agent includes vulcanizing agent DOTG-70.

[0009] To achieve the above object, the present invention also provides a method for preparing the self-lubricating rubber material as described above, comprising the following steps:

[0010] Step S10, putting the ethylene acrylate rubber into an internal mixer for plasticizing, then adding stearic acid, an antioxidant, and a portion of carbon black for plasticizing, then adding dioctyl phthalate for plasticizing, and then adding the remaining carbon black for plasticizing to obtain a plasticized rubber material;

[0011] Step S20, putting the plasticized rubber material into an open mill for refining, producing sheets, and naturally stopping to obtain the refining rubber material;

[0012] Step S30, putting the mixed rubber material and the vulcanizing agent into an open mixer for mixing, and producing sheets to obtain a mixed rubber material;

[0013] Step S40: vulcanizing the mixed rubber material to obtain a self-lubricating rubber material.

[0014] Optionally, in step S10:

[0015] The mass of the partial mass of carbon black is 2 / 5 to 3 / 5 of the total mass of carbon black.

[0016] Optionally, in step S10:

[0017] The rotor speed of the internal mixer is 35-45rpm, the hammer pressure of the internal mixer is 0.4-0.6KG, the material temperature of the material with ethylene acrylate rubber added for plasticizing is 50-60°C, and the plasticizing time is 50-80s, the material temperature of the material with stearic acid, antioxidant, and part of the mass of carbon black added for plasticizing is 85-95°C, and the plasticizing time is 70-100s, the material temperature of the material with dioctyl phthalate added for plasticizing is 105-115°C, and the plasticizing time is 70-100s, and the material temperature of the material with the remaining mass of carbon black added for plasticizing is 100-115°C, and the plasticizing time is 70-100s.

[0018] Optionally, in step S20:

[0019] The natural parking time is 12 to 24 hours.

[0020] Optionally, step S20 includes:

[0021] The roller distance of the open mixer is set to 1.5-2 mm, the plasticized rubber material is put into the open mixer, rolled 1-2 times, triangle-wrapped 3-5 times, rolled 3-5 times, produced sheets, and parked naturally to obtain the open mixer rubber material.

[0022] Optionally, step S30 includes:

[0023] The mixed rubber material and the vulcanizing agent are put into an open mill together, the roller spacing of the open mill is adjusted to 1-2 mm, the triangle bagging operation is performed 5-6 times, the roller spacing is adjusted to 3-4 mm, the rolling and exhausting operation is performed 3-4 times, the roller spacing is then adjusted to 5-6 mm, the rolling and exhausting operation is performed 3-4 times, the roller spacing is then adjusted to 4-5 mm, the rolling and exhausting operation is performed 3-4 times, the roller spacing is then adjusted to 3-4 mm, the rolling and exhausting operation is performed 2-3 times, and the mixed rubber material is produced.

[0024] Optionally, step S40 includes:

[0025] The mixed rubber material is first heated at 170-180° C. for 200-240 seconds, then baked at 140-160° C. for 3-5 hours, and cooled to obtain a self-lubricating rubber material.

[0026] In the technical solution provided by the present invention, ethylene acrylate rubber is used as the main raw material, and auxiliary materials such as antioxidant, dioctyl phthalate, carbon black, stearic acid and vulcanizing agent are added to prepare a self-lubricating rubber material, which can achieve oil self-lubrication and has excellent oil resistance and high temperature resistance. It is suitable for occasions where oil cannot be added or it is difficult to add oil, requires little or no maintenance during use, has good wear resistance, low friction coefficient and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 The present invention is a schematic flow chart of an embodiment of a method for preparing a self-lubricating rubber material provided by the present invention.

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] To make the purpose, technical scheme and advantages of the embodiment of the present invention clearer, the technical scheme in the embodiment of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiment, it is carried out according to the normal conditions or the conditions recommended by the manufacturer. If the reagents or instruments used do not specify the manufacturer, they are all conventional products that can be purchased commercially. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes, taking "A and / or B" as an example, including scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, the technical schemes between the various embodiments can be combined with each other, but must be based on the ability of ordinary technicians in the field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that the combination of such technical solutions does not exist, and is not within the scope of protection required by the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present invention.

[0031] In order to improve the problems of low assembly efficiency and short service life of traditional rubber seals, the present invention proposes a self-lubricating rubber material made of ethylene acrylate rubber (AEM) as the main raw material, and its oil-emitting self-lubricating property can significantly improve the problems of low assembly efficiency and short service life of rubber seals. Specifically, in the present invention, the self-lubricating rubber material includes the following raw materials in parts by mass: 80 to 100 parts of ethylene acrylate rubber, 2 to 3 parts of antioxidant, 0.1 to 0.3 parts of dioctyl phthalate, 10 to 20 parts of carbon black, 1 to 2 parts of stearic acid, and 1 to 3 parts of vulcanizing agent.

[0032] In the technical solution provided by the present invention, the self-lubricating rubber material prepared by using ethylene acrylate rubber as the main raw material and adding auxiliary materials such as antioxidant, dioctyl phthalate, carbon black, stearic acid and vulcanizing agent can realize oil self-lubrication and has excellent high temperature resistance. When used as a sealing ring, it can be applied to occasions where oil cannot be added or it is difficult to add oil. When used, it can be maintained less or not, and has good wear resistance, small friction coefficient and long service life. In addition, the sealing ring made of the self-lubricating rubber material provided by the present invention also has the following advantages: (1) It is easier to assemble, convenient and fast, and the assembly sealing effect is excellent; (2) It has an appropriate amount of elastic plasticity, which can distribute stress on a wider contact surface and improve the bearing capacity of the bearing; (3) The static and dynamic friction coefficients are similar, which can eliminate creeping at low speed, thereby ensuring the working accuracy of the machine; (4) It can reduce vibration, reduce noise, prevent pollution, and improve working conditions of the machine; (5) A transfer film can be formed during operation to protect the grinding shaft and avoid the shaft biting phenomenon.

[0033] The addition of an antioxidant can delay or inhibit the aging process of rubber and its products, and prolong their storage period and service life. Specifically, in some embodiments of the present invention, the antioxidant includes antioxidant 445, that is, 4,4'-bis(α,α-dimethylbenzyl)diphenylamine.

[0034] The role of the rubber vulcanizer is to transform the linear molecular structure of the rubber into a three-dimensional network structure through the "bridging" of the vulcanizer, thereby improving the mechanical and physical properties of the rubber, and generally includes elemental sulfur, selenium, tellurium, sulfur-containing compounds, peroxides, quinone compounds, amine compounds, resin compounds, metal oxides and isocyanates, etc. Specifically, in some embodiments of the present invention, the vulcanizer includes the vulcanizer DOTG-70.

[0035] Based on the self-lubricating rubber material provided by the present invention, the present invention also provides a method for preparing the self-lubricating rubber material, which uses ethylene acrylate rubber as the main raw material, and is prepared by plasticating in an internal mixer, mixing in an open mixer, and vulcanizing. Figure 1 FIG. 1 is an example of a method for preparing the self-lubricating rubber provided by the present invention. Figure 1As shown, in this embodiment, the method for preparing the self-lubricating rubber material comprises the following steps:

[0036] Step S10, putting the ethylene acrylate rubber into an internal mixer for plasticizing, then adding stearic acid, an antioxidant, and a portion of carbon black for plasticizing, then adding dioctyl phthalate for plasticizing, and then adding the remaining carbon black for plasticizing to obtain a plasticized rubber material;

[0037] Step S20, putting the plasticized rubber material into an open mill for refining, producing sheets, and naturally stopping to obtain the refining rubber material;

[0038] Step S30, putting the mixed rubber material and the vulcanizing agent into an open mixer for mixing, and producing sheets to obtain a mixed rubber material;

[0039] Step S40: vulcanizing the mixed rubber material to obtain a self-lubricating rubber material.

[0040] In the technical solution provided by the present invention, ethylene acrylate rubber is used as the main raw material, and auxiliary materials such as antioxidant, dioctyl phthalate, carbon black, stearic acid and vulcanizing agent are added to prepare the self-lubricating rubber material. The process is simple, the cost is low, and it is easy to realize industrialized quantitative production. The prepared self-lubricating rubber material can realize oil self-lubrication, and has excellent oil resistance and high temperature resistance. When used as a sealing ring, it can be suitable for occasions where oil cannot be added or it is difficult to add oil. When in use, less maintenance or no maintenance is required, and the wear resistance is good, the friction coefficient is small, and the service life is long. In addition, the sealing ring made of the self-lubricating rubber material provided by the present invention has the following advantages: (1) It is easier to assemble, more convenient and quicker, and the assembly sealing effect is excellent; (2) It has an appropriate amount of elasticity and plasticity, which can distribute the stress on a wider contact surface and improve the bearing capacity of the bearing; (3) The static and dynamic friction coefficients are similar, which can eliminate creeping at low speeds, thereby ensuring the working accuracy of the machine; (4) It can reduce vibration, reduce noise, prevent pollution, and improve working conditions; (5) A transfer film can be formed during operation to protect the grinding shaft and avoid the shaft biting phenomenon.

[0041] In some embodiments of the present invention, in step S10: the mass of the partial mass of carbon black is 2 / 5 to 3 / 5 of the total mass of carbon black, that is, the mass of the partial mass of carbon black is 40 to 60% of the total mass of carbon black, for example, it can be 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, etc. In some specific embodiments of the present invention, the mass of the partial white carbon black is preferably 50% of the total mass of white carbon black, that is, when feeding, firstly put in 1 / 2 mass of white carbon black for the second mastication, and then put in the remaining 1 / 2 mass of white carbon black for the fourth mastication.

[0042] In some embodiments of the present invention, the rotor speed of the internal mixer in step S10 is set to 35-45rpm, for example, it can be set to 35rpm, 36rpm, 37rpm, 38rpm, 39rpm, 40rpm, 41rpm, 42rpm, 43rpm, 44rpm, 45rpm, etc. In some specific embodiments of the present invention, the rotor speed of the internal mixer is preferably set to 40rpm. The hammer pressure of the internal mixer in step S10 is set to 0.4-0.6KG, for example, it can be 0.4KG, 0.5KG, 0.6KG, etc. In some specific embodiments of the present invention, the hammer pressure of the internal mixer is preferably set to 0.5KG. The material temperature of the ethylene acrylate rubber added for plasticizing in step S10 is 50-60°C, for example, 50°C, 51°C, 52°C, 53°C, 54°C, 55°C, 56°C, 57°C, 58°C, 59°C, 60°C, etc., and the plasticizing time is 50-80s, for example, 50s, 55s, 60s, 65s, 70s, 75s, 80s, etc.; stearic acid, antioxidant, part The material temperature for plasticizing carbon black by weight is 85-95°C, for example, 85°C, 86°C, 87°C, 88°C, 89°C, 90°C, 91°C, 92°C, 93°C, 94°C, 95°C, etc., and the plasticizing time is 70-100s, for example, 70s, 75s, 80s, 85s, 90s, 95s, 100s, etc.; the material temperature for plasticizing by adding dioctyl phthalate is The temperature of the material to be plasticized is 105-115°C, for example, 105°C, 106°C, 107°C, 108°C, 109°C, 110°C, 111°C, 112°C, 113°C, 114°C, 115°C, etc. The plasticizing time is 70-100s, for example, 70s, 75s, 80s, 85s, 90s, 95s, 100s, etc. The temperature of the material to be plasticized with the remaining mass of carbon black is 10 0-115°C, for example, it can be 100°C, 101°C, 102°C, 103°C, 104°C, 105°C, 106°C, 107°C, 108°C, 109°C, 110°C, 111°C, 112°C, 113°C, 114°C, 115°C and the like, and the plasticizing time is 70-100s, for example, it can be 70s, 75s, 80s, 85s, 90s, 95s, 100s and the like.

[0043] In the present invention, the natural parking refers to placing the prepared rubber material at room temperature. In some embodiments of the present invention, in step S20: the parking time of the natural parking is 12 to 24 hours, for example, it can be 12 hours, 13 hours, 14 hours, 15 hours, 16 hours, 17 hours, 18 hours, 19 hours, 20 hours, 21 hours, 22 hours, 23 hours, 24 hours, etc. During this natural parking process, the rubber material can recover from fatigue, relax the mechanical stress during mixing, reduce the shrinkage of the rubber material; make the compounding agent continue to diffuse in the rubber material to promote uniform dispersion; make the rubber and the reinforcing component further interact with each other, generate more combined rubber, and improve the reinforcement effect.

[0044] In the present invention, the open refining in step S20 adopts the combined use of rolling and triangle packing to improve the efficiency of the open refining. In the actual open refining operation, the operating conditions, times and sequence of rolling and triangle packing can be adjusted according to the actual situation of the rubber material. Specifically, in some embodiments of the present invention, step S20 can be implemented in the following manner: set the roller spacing of the open refining mill to 1.5-2mm, put the plasticized rubber material into the open refining mill, perform rolling operation 1-2 times, perform triangle packing operation 3-5 times, perform rolling operation 3-5 times, produce sheets, and park naturally to obtain the open refining rubber material.

[0045] In the present invention, the mixing in step S30 also adopts the combined use of rolling and triangular bagging to improve the mixing efficiency. In the actual mixing operation, the operating conditions, times and sequence of rolling and triangular bagging can be adjusted according to the actual situation of the rubber material. Specifically, in some embodiments of the present invention, step S30 can be implemented in the following manner: the open-mixed rubber material and the vulcanizing agent are put into the open-mixing mill together, the roller spacing of the open-mixing mill is adjusted to 1-2 mm, the triangular bagging operation is performed 5-6 times, the roller spacing is adjusted to 3-4 mm, the rolling and exhausting operation is performed 3-4 times, then the roller spacing is adjusted to 5-6 mm, the rolling and exhausting operation is performed 3-4 times, then the roller spacing is adjusted to 4-5 mm, the rolling and exhausting operation is performed 3-4 times, then the roller spacing is adjusted to 3-4 mm, the rolling and exhausting operation is performed 2-3 times, and the sheet is produced to obtain the mixed rubber material.

[0046] In the present invention, the vulcanization treatment in step S40 includes heating the mixed rubber material at 170-180°C for 200-240s, wherein the heating temperature may be, for example, 170°C, 171°C, 172°C, 173°C, 174°C, 175°C, 176°C, 177°C, 178°C, 179°C, 180°C, etc., preferably 175°C, and the heating time may be, for example, 200s, 210s, 220s, 230s, 240s, etc., preferably 200s; and then baked at 140-160°C for 3-5h, wherein the baking temperature may be, for example, 140°C, 141°C, 142°C, 143°C, 144°C, 145°C, 146°C, 147°C, 148°C, 149°C, 150°C, 151°C, 152°C, 153°C, 154°C, 155°C, 156°C, 157°C, 158°C, 159°C, 160°C, etc., preferably 150°C, and the baking time may be, for example, 3h, 3h 30min, 4h, 4h 30min, 5h, etc., preferably 4h; and after secondary vulcanization and cooling, the rubber material completes cross-linking, and the self-lubricating rubber material is obtained.

[0047] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0048] Example 1

[0049] The self-lubricating rubber material includes the following raw materials, in parts by mass: 80 parts of ethylene acrylate rubber, 2 parts of antioxidant, 0.1 parts of dioctyl phthalate, 10 parts of carbon black, 1 part of stearic acid and 1 part of vulcanizing agent; wherein the antioxidant is antioxidant 445 (i.e. 4,4'-bis(α,α-dimethylbenzyl)diphenylamine), and the vulcanizing agent is vulcanizing agent DOTG-70.

[0050] Example 2

[0051] The self-lubricating rubber material includes the following raw materials, in parts by mass: 85 parts of ethylene acrylate rubber, 2.5 parts of antioxidant, 0.2 parts of dioctyl phthalate, 15 parts of carbon black, 1.3 parts of stearic acid and 1.5 parts of vulcanizing agent; wherein the antioxidant is antioxidant 445 (i.e. 4,4'-bis(α,α-dimethylbenzyl)diphenylamine), and the vulcanizing agent is vulcanizing agent DOTG-70.

[0052] Example 3

[0053] The self-lubricating rubber material includes the following raw materials, in parts by mass: 90 parts of ethylene acrylate rubber, 3 parts of antioxidant, 0.3 parts of dioctyl phthalate, 20 parts of carbon black, 1.5 parts of stearic acid and 2.5 parts of vulcanizing agent; wherein the antioxidant is antioxidant 445 (i.e. 4,4'-bis(α,α-dimethylbenzyl)diphenylamine), and the vulcanizing agent is vulcanizing agent DOTG-70.

[0054] Example 4

[0055] The self-lubricating rubber material includes the following raw materials, in parts by mass: 95 parts of ethylene acrylate rubber, 3 parts of antioxidant, 0.25 parts of dioctyl phthalate, 12 parts of carbon black, 2 parts of stearic acid and 3 parts of vulcanizing agent; wherein the antioxidant is antioxidant 445 (i.e. 4,4'-bis(α,α-dimethylbenzyl)diphenylamine), and the vulcanizing agent is vulcanizing agent DOTG-70.

[0056] Example 5

[0057] The self-lubricating rubber material includes the following raw materials, in parts by mass: 100 parts of ethylene acrylate rubber, 2 parts of antioxidant, 0.15 parts of dioctyl phthalate, 18 parts of carbon black, 1.8 parts of stearic acid and 2 parts of vulcanizing agent; wherein the antioxidant is antioxidant 445 (i.e. 4,4'-bis(α,α-dimethylbenzyl)diphenylamine), and the vulcanizing agent is vulcanizing agent DOTG-70.

[0058] Example 6

[0059] The self-lubricating rubber material includes the following raw materials, in parts by mass: 100 parts of ethylene acrylate rubber, 2.5 parts of antioxidant, 0.2 parts of dioctyl phthalate, 15 parts of carbon black, 1.5 parts of stearic acid and 2 parts of vulcanizing agent; wherein the antioxidant is antioxidant 445 (i.e. 4,4'-bis(α,α-dimethylbenzyl)diphenylamine), and the vulcanizing agent is vulcanizing agent DOTG-70.

[0060] Example 7

[0061] (1) Weigh each raw material according to the formula provided in Example 6;

[0062] (2) The hammer pressure of the internal mixer is set to 0.4 kg and the rotor speed is set to 35 rpm, and the internal mixer is preheated. The ethylene acrylate rubber is put into the preheated internal mixer. After the material temperature is raised to 55° C., it is plasticized for 60 seconds. The material temperature is adjusted to 90° C. and stearic acid, antioxidant, and 1 / 2 of the mass of carbon black are added and plasticized for 80 seconds. The material temperature is adjusted to 110° C. and dioctyl phthalate is added and plasticized for 80 seconds. Finally, the remaining 1 / 2 of the mass of carbon black is added at a material temperature of 110° C. and plasticized for 80 seconds to obtain a plasticized rubber material.

[0063] (3) putting the plasticized rubber obtained in step (2) into an open mill, setting the roller distance of the open mill to 1.5 mm, rolling once, triangular packing three times, rolling three times, discharging sheets, and naturally parking for 12 hours to obtain the open-mixed rubber;

[0064] (4) putting the mixed rubber material obtained in step (3) and the vulcanizing agent into an open mixing mill, adjusting the roller distance to 1 mm, making triangle bags 5 times, adjusting the roller distance to 3 mm, rolling 3 times to exhaust, then adjusting the roller distance to 5 mm, rolling 3 times to exhaust, then adjusting the roller distance to 4 mm, rolling 3 times to exhaust, then adjusting the roller distance to 3 mm, rolling 2 times to exhaust, and discharging the mixed rubber material;

[0065] (5) The mixed rubber material obtained in step (4) is first heated at 170° C. for 240 seconds, then baked at 140° C. for 5 hours, and cooled to obtain a self-lubricating rubber material.

[0066] Example 8

[0067] (1) Weigh each raw material according to the formula provided in Example 6;

[0068] (2) The hammer pressure of the internal mixer is set to 0.5 kg and the rotor speed is set to 40 rpm, and the internal mixer is preheated. The ethylene acrylate rubber is put into the preheated internal mixer. After the material temperature is raised to 50° C., it is plasticized for 80 seconds. The material temperature is adjusted to 80° C. and stearic acid, antioxidant, and 2 / 5 of the mass of carbon black are added and plasticized for 100 seconds. The material temperature is adjusted to 105° C. and dioctyl phthalate is added and plasticized for 100 seconds. Finally, the material temperature is adjusted to 100° C. and the remaining 3 / 5 of the mass of carbon black is added and plasticized for 100 seconds to obtain a plasticized rubber material.

[0069] (3) putting the plasticized rubber obtained in step (2) into an open mill, setting the roller distance of the open mill to 2 mm, rolling 2 times, triangular packing 4 times, rolling 4 times, discharging sheets, and naturally parking for 18 hours to obtain the open-mixed rubber;

[0070] (4) putting the mixed rubber material obtained in step (3) and the vulcanizing agent into an open mixing mill, adjusting the roller distance to 2 mm, making triangle bags 6 times, adjusting the roller distance to 4 mm, rolling and exhausting 4 times, then adjusting the roller distance to 6 mm, rolling and exhausting 4 times, then adjusting the roller distance to 5 mm, rolling and exhausting 4 times, then adjusting the roller distance to 4 mm, rolling and exhausting 3 times, and discharging sheets to obtain a mixed rubber material;

[0071] (5) The mixed rubber material obtained in step (4) is first heated at 180° C. for 200 seconds, then baked at 140° C. for 5 hours, and cooled to obtain a self-lubricating rubber material.

[0072] Example 9

[0073] (1) Weigh each raw material according to the formula provided in Example 6;

[0074] (2) The hammer pressure of the internal mixer is set to 0.6 kg and the rotor speed is set to 45 rpm, and the internal mixer is preheated. The ethylene acrylate rubber is put into the preheated internal mixer. After the material temperature is raised to 52° C., it is plasticized for 70 seconds. The material temperature is adjusted to 88° C. and stearic acid, antioxidant, and 1 / 2 of the mass of carbon black are added for plasticization for 90 seconds. The material temperature is adjusted to 108° C. and dioctyl phthalate is added for plasticization for 90 seconds. Finally, the material temperature is adjusted to 112° C. and the remaining 1 / 2 of the mass of carbon black is added for plasticization for 90 seconds to obtain a plasticized rubber material.

[0075] (3) putting the plasticized rubber obtained in step (2) into an open mill, setting the roller distance of the open mill to 1.5 mm, rolling once, triangular packing 5 times, rolling 4 times, discharging sheets, and naturally parking for 15 hours to obtain the open-mixed rubber;

[0076] (4) putting the mixed rubber material obtained in step (3) and the vulcanizing agent into an open mixer, adjusting the roller distance to 2 mm, making triangle bags 5 times, adjusting the roller distance to 3 mm, rolling and exhausting 3 times, then adjusting the roller distance to 5 mm, rolling and exhausting 3 times, then adjusting the roller distance to 4 mm, rolling and exhausting 4 times, then adjusting the roller distance to 3 mm, rolling and exhausting 3 times, and producing sheets to obtain a mixed rubber material;

[0077] (5) The mixed rubber material obtained in step (4) is first heated at 1750° C. for 220 seconds, then baked at 150° C. for 4 hours, and cooled to obtain a self-lubricating rubber material.

[0078] Example 10

[0079] (1) Weigh each raw material according to the formula provided in Example 6;

[0080] (2) The hammer pressure of the internal mixer is set to 0.5 kg and the rotor speed is set to 40 rpm, and the internal mixer is preheated. The ethylene acrylate rubber is put into the preheated internal mixer. After the material temperature is raised to 58° C., it is plasticized for 65 seconds. The material temperature is adjusted to 93° C. and stearic acid, antioxidant, and 1 / 2 of the mass of carbon black are added for plasticization for 85 seconds. The material temperature is adjusted to 112° C. and dioctyl phthalate is added for plasticization for 85 seconds. Finally, the material temperature is adjusted to 108° C. and the remaining 1 / 2 of the mass of carbon black is added for plasticization for 85 seconds to obtain a plasticized rubber material.

[0081] (3) putting the plasticized rubber obtained in step (2) into an open mill, setting the roller distance of the open mill to 2 mm, rolling once, triangular packing three times, rolling four times, discharging sheets, and naturally parking for 20 hours to obtain the open-mixed rubber;

[0082] (4) putting the mixed rubber material obtained in step (3) and the vulcanizing agent into an open mixing mill, adjusting the roller distance to 1 mm, making triangle bags 6 times, adjusting the roller distance to 3 mm, rolling 3 times to exhaust, then adjusting the roller distance to 6 mm, rolling 3 times to exhaust, then adjusting the roller distance to 4 mm, rolling 4 times to exhaust, then adjusting the roller distance to 3 mm, rolling 2 times to exhaust, and discharging the mixed rubber material;

[0083] (5) The mixed rubber material obtained in step (4) is first heated at 175° C. for 210 seconds, then baked at 155° C. for 3.5 hours, and cooled to obtain a self-lubricating rubber material.

[0084] Embodiment 11

[0085] (1) Weigh each raw material according to the formula provided in Example 6;

[0086] (2) The hammer pressure of the internal mixer is set to 0.5 kg and the rotor speed is set to 40 rpm, and the internal mixer is preheated. The ethylene acrylate rubber is put into the preheated internal mixer. After the material temperature is raised to 60° C., it is plasticized for 50 seconds. The material temperature is adjusted to 95° C. and stearic acid, antioxidant, and 1 / 2 of the mass of carbon black are added and plasticized for 70 seconds. The material temperature is adjusted to 115° C. and dioctyl phthalate is added and plasticized for 70 seconds. Finally, the remaining 1 / 2 of the mass of carbon black is added at a material temperature of 115° C. and plasticized for 70 seconds to obtain a plasticized rubber material.

[0087] (3) putting the plasticized rubber obtained in step (2) into an open mill, setting the roller distance of the open mill to 2 mm, rolling 2 times, triangle packing 5 times, rolling 4 times, discharging sheets, and naturally parking for 24 hours to obtain the open mill rubber;

[0088] (4) putting the mixed rubber material obtained in step (3) and the vulcanizing agent into an open mixing mill, adjusting the roller distance to 2 mm, making triangle bags 6 times, adjusting the roller distance to 4 mm, rolling 3 times to exhaust, then adjusting the roller distance to 6 mm, rolling 3 times to exhaust, then adjusting the roller distance to 5 mm, rolling 3 times to exhaust, then adjusting the roller distance to 4 mm, rolling 2 times to exhaust, and discharging the mixed rubber material;

[0089] (5) The mixed rubber material obtained in step (4) is first heated at 177° C. for 200 seconds, then baked at 145° C. for 4.5 hours, and cooled to obtain a self-lubricating rubber material.

[0090] Taking nitrile rubber and silicone rubber as comparative examples, various related properties of the self-lubricating rubber material provided by the comparative example and the embodiment of the present invention were tested respectively (the test piece size was 150 mm×150 mm×2 mm). The test methods and results are shown in Table 1 below.

[0091] Table 1 Relevant performance data of self-lubricating rubber materials provided in Examples and Comparative Examples

[0092]

[0093]

[0094] It can be seen from the results in Table 1 that, compared with the self-lubricating rubber made of nitrile rubber and silicone rubber, the self-lubricating rubber material made with ethylene acrylate rubber as the base material in the embodiment of the present invention has better oil resistance, better assembly sealing effect, better wear resistance, small friction coefficient and longer service life.

[0095] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the patent protection scope of the present invention.

Claims

1. A self-lubricating rubber material, characterized in that: The self-lubricating rubber material comprises the following raw materials in parts by mass: 80-100 parts of ethylene acrylate rubber, 2-3 parts of antioxidant, 0.1-0.3 parts of dioctyl phthalate, 10-20 parts of carbon black, 1-2 parts of stearic acid and 1-3 parts of vulcanizing agent.

2. The self-lubricating rubber material according to claim 1, characterized in that: The antioxidant includes 4,4'-bis(α,α-dimethylbenzyl)diphenylamine.

3. The self-lubricating rubber material according to claim 1, characterized in that: The vulcanizing agent includes vulcanizing agent DOTG-70.

4. A method for preparing a self-lubricating rubber material according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step S10, putting the ethylene acrylate rubber into an internal mixer for plasticizing, then adding stearic acid, an antioxidant, and a portion of carbon black for plasticizing, then adding dioctyl phthalate for plasticizing, and then adding the remaining carbon black for plasticizing to obtain a plasticized rubber material; Step S20, putting the plasticized rubber material into an open mill for refining, producing sheets, and naturally stopping to obtain the refining rubber material; Step S30, putting the mixed rubber material and the vulcanizing agent into an open mixer for mixing, and producing sheets to obtain a mixed rubber material; Step S40: vulcanizing the mixed rubber material to obtain a self-lubricating rubber material.

5. The method for preparing the self-lubricating rubber material according to claim 4, characterized in that: In step S10: The mass of the partial mass of carbon black is 2 / 5 to 3 / 5 of the total mass of carbon black.

6. The method for preparing the self-lubricating rubber material according to claim 4, characterized in that: In step S10: The rotor speed of the internal mixer is 35-45rpm, the hammer pressure of the internal mixer is 0.4-0.6KG, the material temperature of the material with ethylene acrylate rubber added for plasticizing is 50-60°C, and the plasticizing time is 50-80s, the material temperature of the material with stearic acid, antioxidant, and part of the mass of carbon black added for plasticizing is 85-95°C, and the plasticizing time is 70-100s, the material temperature of the material with dioctyl phthalate added for plasticizing is 105-115°C, and the plasticizing time is 70-100s, and the material temperature of the material with the remaining mass of carbon black added for plasticizing is 100-115°C, and the plasticizing time is 70-100s.

7. The method for preparing the self-lubricating rubber material according to claim 4, characterized in that: In step S20: The natural parking time is 12 to 24 hours.

8. The method for preparing the self-lubricating rubber material according to claim 4, characterized in that: Step S20 includes: The roller distance of the open mixer is set to 1.5-2 mm, the plasticized rubber material is put into the open mixer, rolled 1-2 times, triangle-wrapped 3-5 times, rolled 3-5 times, produced sheets, and parked naturally to obtain the open mixer rubber material.

9. The method for preparing the self-lubricating rubber material according to claim 4, characterized in that: Step S30 includes: The mixed rubber material, the vulcanizing agent and the stearic acid are put into an open mill together, the roller spacing of the open mill is adjusted to 1-2 mm, the triangle bagging operation is performed 5-6 times, the roller spacing is adjusted to 3-4 mm, the rolling and exhausting operation is performed 3-4 times, the roller spacing is then adjusted to 5-6 mm, the rolling and exhausting operation is performed 3-4 times, the roller spacing is then adjusted to 4-5 mm, the rolling and exhausting operation is performed 3-4 times, the roller spacing is then adjusted to 3-4 mm, the rolling and exhausting operation is performed 2-3 times, and the mixed rubber material is produced.

10. The method for preparing the self-lubricating rubber material according to claim 4, characterized in that: Step S40 includes: The mixed rubber material is first heated at 170-180° C. for 200-240 seconds, then baked at 140-160° C. for 3-5 hours, and cooled to obtain a self-lubricating rubber material.

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