Oil-emitting self-lubricating silicone rubber material and preparation method thereof

Abstract

The invention discloses an oil-emitting self-lubricating silicone rubber material and a preparation method thereof. The oil-emitting self-lubricating silicone rubber material is prepared from the following raw materials in parts by mass: 100 parts of vinyl silicone rubber, 15-30 parts of vulcanizing agent, 45-55 parts of white carbon black, 10-15 parts of phenyl silicone oil and 1-3 parts of nano metal oxide. The oil-emitting self-lubricating silicone rubber material prepared by taking vinyl silicone rubber as a main raw material is excellent in high temperature resistance, longer in service life and good in pressure change performance, and the size stability of the product can be improved.

Description

Technical Field

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

[0002] In actual applications, rubber sealing rings have the problems of low assembly efficiency, unsatisfactory sealing effect and short service life. The emergence of oil-leaking self-lubricating rubber sealing rings can greatly improve the current problems of low assembly efficiency, poor sealing effect and short service life of rubber sealing rings. However, the processed product size is unstable and the high temperature resistance is poor, and the service life is not ideal under high temperature conditions. Summary of the invention

[0003] The main purpose of the present invention is to provide an oil-emitting self-lubricating silicone rubber material and a preparation method thereof, aiming to provide an oil-emitting self-lubricating silicone rubber material with stable dimensions and excellent high temperature resistance.

[0004] To achieve the above object, the present invention provides an oil-emitting self-lubricating silicone rubber material, wherein the oil-emitting self-lubricating silicone rubber material comprises the following raw materials in parts by weight:

[0005] 100 parts of vinyl silicone rubber, 15-30 parts of vulcanizing agent, 45-55 parts of white carbon black, 10-15 parts of phenyl silicone oil, and 1-3 parts of nano metal oxide.

[0006] Optionally, the vulcanizing agent includes 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane.

[0007] Optionally, the white carbon black includes fumed white carbon black.

[0008] Optionally, the nano metal oxide includes nano cerium oxide.

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

[0010] Step S10, putting the vinyl silicone rubber into an internal mixer for the first plasticization, then adding nano metal oxide and part of white carbon black for the second plasticization, then adding phenyl silicone oil for the third plasticization, then adding the remaining white carbon black for the fourth plasticization, discharging the material after the plasticization is completed to obtain a plasticized rubber material;

[0011] Step S20, putting the plasticized rubber material into an open mixer for mixing, discharging sheets, and naturally stopping to obtain a mixed rubber material;

[0012] Step S30, mixing the mixed rubber material and the vulcanizing agent again by using an open mill to produce sheets to obtain a rubber material to be vulcanized;

[0013] Step S40, heating the rubber material to be vulcanized at 170-180° C. for 200-240 seconds, then heating at 180-200° C. for 3.5-4.5 hours, and cooling to obtain an oil-emitting self-lubricating silicone rubber material.

[0014] Optionally, in step S10:

[0015] The mass of the part of white carbon black is 40-60% of the total mass of white carbon black.

[0016] Optionally, in step S10:

[0017] The hammer pressure of the internal mixer is set to 0.4-0.6KG, and the rotor speed of the internal mixer is set to 35-45rpm;

[0018] The material temperature during the first plasticizing is 55-65°C and the plasticizing time is 240-360s;

[0019] The material temperature during the second plasticizing is 65-75°C and the plasticizing time is 150-240s;

[0020] The material temperature during the third plasticizing is 75-85°C and the plasticizing time is 150-240s;

[0021] The material temperature during the fourth plasticizing is 75-85° C., and the plasticizing time is 150-240 seconds.

[0022] Optionally, the mixing in step S20 includes:

[0023] Adjust the roller spacing of the mixing mill to 1.5-2 mm, perform the coiling operation 1-2 times, perform the triangle bagging operation 3-5 times, and perform the coiling operation 3-5 times.

[0024] Optionally, in step S20:

[0025] The natural parking time is 12 to 24 hours.

[0026] Optionally, the re-mixing in step S30 includes:

[0027] First adjust the roller spacing of the mixing mill to 1-2mm, perform the triangle bag operation 5-6 times, then adjust the roller spacing to 3-4mm, roll the product 3-4 times to exhaust, then adjust the roller spacing to 5-6mm, roll the product 3-4 times to exhaust, then adjust the roller spacing to 4-5mm, roll the product 3-4 times to exhaust, then adjust the roller spacing to 3-4mm, roll the product 2-3 times to exhaust.

[0028] In the technical solution provided by the present invention, the oil-emitting self-lubricating silicone rubber material made of vinyl silicone rubber as the main raw material has excellent high temperature resistance, a longer service life of the product, good compression deformation performance, and better dimensional stability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 The present invention provides a flow chart of an embodiment of a method for preparing an oil-emitting self-lubricating silicone rubber material.

[0031] 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

[0032] 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.

[0033] In order to improve the high temperature resistance of a self-lubricating rubber sealing ring, the present invention proposes an oil-emitting self-lubricating silicone rubber material, which includes the following raw materials in parts by mass: 100 parts of vinyl silicone rubber, 15 to 30 parts of a vulcanizing agent, 45 to 55 parts of white carbon black, 10 to 15 parts of phenyl silicone oil, and 1 to 3 parts of nano metal oxide.

[0034] In the technical solution provided by the present invention, the oil-emitting self-lubricating silicone rubber material made of vinyl silicone rubber as the main raw material has excellent high temperature resistance, better sealing effect, and longer product service life. At the same time, it has better pressure change performance and better dimensional stability of the product. In addition, the oil-emitting self-lubricating silicone rubber material provided by the present invention is also low in cost.

[0035] The vulcanizing agent of rubber includes elemental sulfur, selenium, tellurium, sulfur-containing compounds, peroxides, quinone compounds, amine compounds, resin compounds, metal oxides and isocyanates, etc. In some embodiments of the present invention, the vulcanizing agent includes the vulcanizing agent dipentadienyl, i.e., 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, which has a good vulcanization effect.

[0036] White carbon black is a general term for white powdered X-ray amorphous silicic acid and silicate products, including precipitated silica, fumed silica and ultrafine silica gel, as well as powdered synthetic aluminum silicate and calcium silicate, etc. It is generally divided into precipitated white carbon black and fumed white carbon black according to the production method. Fumed white carbon black is a white amorphous flocculent translucent solid colloidal nanoparticle (particle size less than 100nm) under normal conditions, non-toxic, with a huge specific surface area. Fumed white carbon black is all nano-silicon dioxide, the product purity can reach 99%, and the particle size can reach 10 to 20nm. In some embodiments of the present invention, the white carbon black includes fumed white carbon black, which can effectively achieve the reinforcement of silicone rubber.

[0037] In the present invention, the addition of the nano metal oxide can improve the heat resistance of the rubber and shorten the processing time. In some embodiments of the present invention, the nano metal oxide includes nano cerium oxide, which has a better effect on improving the high temperature resistance and stability of the rubber.

[0038] Based on the above-mentioned oil-emitting self-lubricating silicone rubber material, the present invention also provides a method for preparing the oil-emitting self-lubricating silicone rubber material, which is prepared by using vinyl silicone rubber as the main raw material through plasticating in an internal mixer, mixing in an open mixer and vulcanization process. Figure 1 FIG. 1 is an example of a method for preparing the oil-emitting self-lubricating silicone rubber material provided by the present invention. Figure 1 As shown, in the present invention, the preparation method of the oil-emitting self-lubricating silicone rubber comprises the following steps:

[0039] Step S10, putting the vinyl silicone rubber into an internal mixer for the first plasticization, then adding nano metal oxide and part of white carbon black for the second plasticization, then adding phenyl silicone oil for the third plasticization, then adding the remaining white carbon black for the fourth plasticization, discharging the material after the plasticization is completed to obtain a plasticized rubber material;

[0040] Step S20, putting the plasticized rubber material into an open mixer for mixing, discharging sheets, and naturally stopping to obtain a mixed rubber material;

[0041] Step S30, mixing the mixed rubber material and the vulcanizing agent again by using an open mill to produce sheets to obtain a rubber material to be vulcanized;

[0042] Step S40, heating the rubber material to be vulcanized at 170-180° C. for 200-240 seconds, then heating at 180-200° C. for 3.5-4.5 hours, and cooling to obtain an oil-emitting self-lubricating silicone rubber material.

[0043] The invention uses vinyl silicone rubber as a main raw material, supplemented with a vulcanizing agent, white carbon black, phenyl silicone oil and nano metal oxide, firstly plasticizes in an internal mixer, then mixes in an open mixer, and vulcanizes after naturally parking. After primary vulcanization and secondary vulcanization, an oil-emitting self-lubricating silicone rubber material is obtained. The material has excellent high temperature resistance, good sealing effect, longer product service life, better compression deformation performance, and higher product dimensional stability. At the same time, the preparation process is simple and controllable, the cost is low, and it is easy to realize industrialized quantitative production.

[0044] In some embodiments of the present invention, the mass of the part of the white carbon black in step S10 is 40-60% of the total mass of the white 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 part of the white carbon black is preferably 50% of the total mass of the white carbon black, that is, when feeding, firstly half of the mass of the white carbon black is fed for the second mastication, and then the remaining half of the mass of the white carbon black is fed for the fourth mastication.

[0045] In some embodiments of the present invention, 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 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.

[0046] Further, in some embodiments of the present invention, in step S10: the material temperature during the first plasticizing is 55-65°C, for example, it can be 55°C, 56°C, 57°C, 58°C, 59°C, 60°C, 61°C, 62°C, 63°C, 64°C, 65°C, etc., preferably 60°C; the plasticizing time of the first plasticizing is 240-360s, for example, it can be 240s, 250s, 260s, 270s, 280s, 290s, 300s, 310s, 320s, The material temperature during the second plasticizing is 65-75°C, for example, 65°C, 66°C, 67°C, 68°C, 69°C, 70°C, 71°C, 72°C, 73°C, 74°C, 75°C, etc., preferably 70°C; the plasticizing time of the second plasticizing is 150-240s, for example, 150s, 160s, 170s, 180s, 190s, 200s, 210s, 220s, The material temperature during the third plasticizing is 75-85°C, for example, 75°C, 76°C, 77°C, 78°C, 79°C, 80°C, 81°C, 82°C, 83°C, 84°C, 85°C, etc., preferably 80°C; the plasticizing time of the third plasticizing is 150-240s, for example, 150s, 160s, 170s, 180s, 190s, 200s, 210s, 220s, 230s, 240s, etc. etc., preferably 200s; the material temperature during the fourth plasticizing is 75-85°C, for example, it can be 75°C, 76°C, 77°C, 78°C, 79°C, 80°C, 81°C, 82°C, 83°C, 84°C, 85°C and the like, preferably 80°C; the plasticizing time of the fourth plasticizing is 150-240s, for example, it can be 150s, 160s, 170s, 180s, 190s, 200s, 210s, 220s, 230s, 240s and the like, preferably 200s.

[0047] In the present invention, the mixing in step S20 adopts the combined use of rolling and triangle packing to improve the mixing efficiency. In the actual mixing 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, the mixing in step S20 includes: adjusting the roller distance of the mixing mill to 1.5-2 mm, rolling 1-2 times, triangle packing 3-5 times, and rolling 3-5 times.

[0048] In the present invention, the natural parking refers to placing the prepared rubber material at room temperature. In some embodiments of the present invention, the parking time of the natural parking in step S20 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, promote uniform dispersion, make the rubber and the reinforcing component further interact with each other, generate more combined rubber, and improve the reinforcing effect.

[0049] In the present invention, the re-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, the re-mixing in step S30 includes: first adjusting the roller spacing of the open mixing mill to 1-2 mm, performing triangular bagging 5-6 times, then adjusting the roller spacing to 3-4 mm, performing the rolling operation 3-4 times to exhaust, then adjusting the roller spacing to 5-6 mm, performing the rolling operation 3-4 times to exhaust, then adjusting the roller spacing to 4-5 mm, performing the rolling operation 3-4 times to exhaust, then adjusting the roller spacing to 3-4 mm, performing the rolling operation 2-3 times to exhaust.

[0050] In step S40, the rubber material to be vulcanized is first heated at 170-180° C. for 200-240 seconds. 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., and the heating time may be, for example, 200 seconds, 210 seconds, 220 seconds, 230 seconds, 240 seconds, etc.; and then heated at 18 The rubber material is heated at 0-200°C for 3.5-4.5h, and the heating temperature can be, for example, 180°C, 181°C, 182°C, 183°C, 184°C, 185°C, 186°C, 187°C, 188°C, 189°C, 190°C, 191°C, 192°C, 193°C, 194°C, 195°C, 196°C, 197°C, 198°C, 199°C, 200°C, etc., and the heating time can be, for example, 3h 30min, 3h 40min, 3h 50min, 4h, 4h10min, 4h 20min, 4h 30min, etc. After the secondary vulcanization, the rubber material completes cross-linking to obtain the oil-emitting self-lubricating silicone rubber material.

[0051] 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.

[0052] Example 1

[0053] The oil-emitting self-lubricating silicone rubber includes the following raw materials, in parts by mass: 100 parts of vinyl silicone rubber, 15 parts of vulcanizing agent, 45 parts of white carbon black, 10 parts of phenyl silicone oil, and 1 part of nano metal oxide, wherein the vulcanizing agent is vulcanizing agent dipentadienyl (2,5-dimethyl-2,5-di(tert-butylperoxy)hexane), the white carbon black is fumed white carbon black, and the nano metal oxide is nano cerium oxide.

[0054] Example 2

[0055] The oil-emitting self-lubricating silicone rubber includes the following raw materials, in parts by mass: 100 parts of vinyl silicone rubber, 20 parts of vulcanizing agent, 50 parts of white carbon black, 12 parts of phenyl silicone oil, and 2 parts of nano metal oxide, wherein the vulcanizing agent is the vulcanizing agent dipentadienyl (2,5-dimethyl-2,5-di(tert-butylperoxy)hexane), the white carbon black is fumed white carbon black, and the nano metal oxide is nano cerium oxide.

[0056] Example 3

[0057] The oil-emitting self-lubricating silicone rubber includes the following raw materials, in parts by mass: 100 parts of vinyl silicone rubber, 25 parts of vulcanizing agent, 55 parts of white carbon black, 15 parts of phenyl silicone oil, and 3 parts of nano metal oxides, wherein the vulcanizing agent is the vulcanizing agent dipentadienyl (2,5-dimethyl-2,5-di(tert-butylperoxy)hexane), the white carbon black is fumed white carbon black, and the nano metal oxide is nano cerium oxide.

[0058] Example 4

[0059] The oil-emitting self-lubricating silicone rubber includes the following raw materials, in parts by mass: 100 parts of vinyl silicone rubber, 30 parts of vulcanizing agent, 47 parts of white carbon black, 11 parts of phenyl silicone oil, and 1.5 parts of nano metal oxide, wherein the vulcanizing agent is the vulcanizing agent dipentadienyl (2,5-dimethyl-2,5-di(tert-butylperoxy)hexane), the white carbon black is fumed white carbon black, and the nano metal oxide is nano cerium oxide.

[0060] Example 5

[0061] The oil-emitting self-lubricating silicone rubber includes the following raw materials, in parts by mass: 100 parts of vinyl silicone rubber, 22 parts of vulcanizing agent, 53 parts of white carbon black, 13 parts of phenyl silicone oil, and 2.5 parts of nano metal oxide, wherein the vulcanizing agent is vulcanizing agent dipentadienyl (2,5-dimethyl-2,5-di(tert-butylperoxy)hexane), the white carbon black is fumed white carbon black, and the nano metal oxide is nano cerium oxide.

[0062] Example 6

[0063] (1) Weigh each raw material according to the formula provided in Example 1;

[0064] (2) Preheating the internal mixer, setting the hammer pressure of the internal mixer to 0.4KG and the rotor speed to 35rpm, putting the vinyl silicone rubber into the internal mixer, and plasticizing for 360s after the material temperature rises to 55°C; then adding nano metal oxides and 1 / 2 of the mass of white carbon black and adjusting the material temperature to 65°C, and plasticizing for 240s; then adding phenyl silicone oil and adjusting the material temperature to 75°C, and plasticizing for 240s; then continuing to add the remaining 1 / 2 of the mass of white carbon black at a material temperature of 75°C, and plasticizing for 240s; after plasticizing, discharging the material to obtain a plasticized rubber material;

[0065] (3) putting the plasticized rubber obtained in step (2) into an open mill for mixing, adjusting the roller distance of the open mill to 1.5 mm, rolling once, triangular wrapping three times, rolling three times, discharging sheets, and naturally parking for 12 hours to obtain a mixed rubber material;

[0066] (4) putting the mixed rubber material and the vulcanizing agent obtained in step (3) into an open mill for mixing, adjusting the roller gap of the open mill to 1 mm, making triangle wraps 5 times, adjusting the roller gap to 3 mm, rolling and exhausting 3 times, adjusting the roller gap to 5 mm, rolling and exhausting 3 times, adjusting the roller gap to 4 mm, rolling and exhausting 3 times, adjusting the roller gap to 3 mm, rolling and exhausting 2 times, and discharging sheets to obtain the rubber material to be vulcanized;

[0067] (5) The vulcanized rubber material obtained in step (4) is first heated at 170° C. for 200 seconds, then placed in an oven set at 190° C. and heated for 4.5 hours, and then cooled to obtain an oil-emitting self-lubricating silicone rubber material.

[0068] Example 7

[0069] (1) Weigh each raw material according to the formula provided in Example 2;

[0070] (2) Preheating the internal mixer, setting the hammer pressure of the internal mixer to 0.5KG and the rotor speed to 40rpm, putting the vinyl silicone rubber into the internal mixer, and plasticizing for 300s after the material temperature rises to 60°C; then adding nano metal oxides and 2 / 5 of the mass of white carbon black and adjusting the material temperature to 70°C, and plasticizing for 200s; then adding phenyl silicone oil and adjusting the material temperature to 80°C, and plasticizing for 200s; then continuing to add the remaining 3 / 5 of the mass of white carbon black at a plasticizing temperature of 80°C, and plasticizing for 200s; after plasticizing, discharging the material to obtain a plasticized rubber material;

[0071] (3) putting the plasticized rubber obtained in step (2) into an open mill for mixing, adjusting the roller distance of the open mill to 1.8 mm, rolling 2 times, triangle packing 4 times, rolling 4 times, discharging sheets, and naturally parking for 18 hours to obtain a mixed rubber material;

[0072] (4) putting the mixed rubber material and the vulcanizing agent obtained in step (3) into an open mill for mixing, adjusting the roller spacing of the open mill to 1.5 mm, making triangle wraps 6 times, adjusting the roller spacing to 3.5 mm, rolling and venting 4 times, adjusting the roller spacing to 5.5 mm, rolling and venting 3 times, adjusting the roller spacing to 4.5 mm, rolling and venting 4 times, adjusting the roller spacing to 3.5 mm, rolling and venting 2 times, and discharging sheets to obtain the rubber material to be vulcanized;

[0073] (5) The vulcanized rubber material obtained in step (4) is first heated at 175° C. for 220 seconds, then placed in an oven set at 200° C. for heating for 4 hours, and cooled to obtain an oil-emitting self-lubricating silicone rubber material.

[0074] Example 8

[0075] (1) Weigh each raw material according to the formula provided in Example 3;

[0076] (2) Preheating the internal mixer, setting the hammer pressure of the internal mixer to 0.6KG and the rotor speed to 45rpm, adding the vinyl silicone rubber into the internal mixer, and plasticizing for 240s after the material temperature rises to 65°C; then adding nano metal oxides and 3 / 5 of the weight of white carbon black and adjusting the material temperature to 75°C, and plasticizing for 150s; then adding phenyl silicone oil and adjusting the material temperature to 85°C, and plasticizing for 150s; then continuing to add the remaining 2 / 5 of the weight of white carbon black at a material temperature of 85°C, and plasticizing for 150s; after plasticizing, discharging the material to obtain a plasticized rubber material;

[0077] (3) putting the plasticized rubber obtained in step (2) into an open mill for mixing, adjusting the roller distance of the open mill to 2 mm, rolling 2 times, triangle packing 5 times, rolling 5 times, discharging sheets, and naturally standing for 24 hours to obtain a mixed rubber material;

[0078] (4) putting the mixed rubber material and the vulcanizing agent obtained in step (3) into an open mill for mixing, adjusting the roller spacing of the open mill to 2 mm, making triangle wraps 6 times, adjusting the roller spacing to 4 mm, rolling and venting 4 times, adjusting the roller spacing to 6 mm, rolling and venting 4 times, adjusting the roller spacing to 5 mm, rolling and venting 4 times, adjusting the roller spacing to 4 mm, rolling and venting 3 times, and discharging sheets to obtain the rubber material to be vulcanized;

[0079] (5) The vulcanized rubber material obtained in step (4) is first heated at 80° C. for 240 seconds, then placed in an oven set at 195° C. and heated for 3.5 hours, and then cooled to obtain an oil-emitting self-lubricating silicone rubber material.

[0080] Example 9

[0081] (1) Weigh the raw materials according to the formula provided in Example 4;

[0082] (2) Preheating the internal mixer, setting the hammer pressure of the internal mixer to 0.5KG and the rotor speed to 40rpm, putting the vinyl silicone rubber into the internal mixer, and plasticizing for 300s after the material temperature rises to 60°C; then adding nano metal oxides and 1 / 2 of the mass of white carbon black and adjusting the material temperature to 70°C, and plasticizing for 180s; then adding phenyl silicone oil and adjusting the material temperature to 80°C, and plasticizing for 210s; then adding the remaining 1 / 2 of the mass of white carbon black and adjusting the material temperature to 85°C, and plasticizing for 180s; after plasticizing, discharging the material to obtain a plasticized rubber material;

[0083] (3) putting the plasticized rubber obtained in step (2) into an open mill for mixing, adjusting the roller distance of the open mill to 2 mm, rolling 2 times, triangle packing 5 times, rolling 5 times, discharging sheets, and naturally parking for 20 hours to obtain a mixed rubber material;

[0084] (4) putting the mixed rubber material and the vulcanizing agent obtained in step (3) into an open mill for mixing, adjusting the roller spacing of the open mill to 2 mm, making triangle wraps 6 times, adjusting the roller spacing to 4 mm, rolling and venting 4 times, adjusting the roller spacing to 6 mm, rolling and venting 4 times, adjusting the roller spacing to 5 mm, rolling and venting 4 times, adjusting the roller spacing to 4 mm, rolling and venting 3 times, and discharging sheets to obtain the rubber material to be vulcanized;

[0085] (5) The vulcanized rubber material obtained in step (4) is first heated at 175° C. for 210 seconds, then placed in an oven set at 185° C. for 3 hours and 50 minutes, and cooled to obtain an oil-emitting self-lubricating silicone rubber material.

[0086] Example 10

[0087] (1) Weigh each raw material according to the formula provided in Example 5;

[0088] (2) Preheating the internal mixer, setting the hammer pressure of the internal mixer to 0.5KG and the rotor speed to 40rpm, putting the vinyl silicone rubber into the internal mixer, and plasticizing for 330s after the material temperature rises to 60°C; then adding nano metal oxides and 1 / 2 of the mass of white carbon black and adjusting the material temperature to 70°C, and plasticizing for 210s; then adding phenyl silicone oil and adjusting the material temperature to 80°C, and plasticizing for 180s; then continuing to add the remaining 1 / 2 of the mass of white carbon black at a material temperature of 80°C, and plasticizing for 210s; after plasticizing, discharging the material to obtain a plasticized rubber material;

[0089] (3) putting the plasticized rubber obtained in step (2) into an open mill for mixing, adjusting the roller distance of the open mill to 1.5 mm, rolling 2 times, triangle packing 5 times, rolling 4 times, discharging sheets, and naturally parking for 15 hours to obtain a mixed rubber material;

[0090] (4) putting the mixed rubber material and the vulcanizing agent obtained in step (3) into an open mill for mixing, adjusting the roller gap of the open mill to 1 mm, making triangle wraps 6 times, adjusting the roller gap to 3 mm, rolling and exhausting 4 times, adjusting the roller gap to 5 mm, rolling and exhausting 4 times, adjusting the roller gap to 4 mm, rolling and exhausting 4 times, adjusting the roller gap to 3 mm, rolling and exhausting 3 times, and discharging sheets to obtain the rubber material to be vulcanized;

[0091] (5) The vulcanized rubber material obtained in step (4) is first heated at 175° C. for 230 seconds, then placed in an oven set at 180° C. for 4 hours and 15 minutes, and cooled to obtain an oil-emitting self-lubricating silicone rubber material.

[0092] Taking the commercially available ordinary oil-emitting silicone rubber material as a comparative example, various relevant properties of the comparative example and the oil-emitting self-lubricating silicone rubber material provided by the embodiment of the present invention were tested (the test piece size was 150 mm×150 mm×2 mm). The test method and results are shown in Table 1 below.

[0093] Table 1 Relevant performance data of silicone rubber materials provided in various embodiments and comparative examples

[0094]

[0095] It can be seen from the test data in Table 1 that, compared with the comparative example, the oil-emitting self-lubricating silicone rubber material provided in the embodiment of the present invention has better compression deformation performance, which is beneficial to improving the dimensional stability of the product and the yield rate, and has better high temperature resistance, so that the sealing effect of the silicone rubber is better and the service life of the product can be effectively extended.

[0096] 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. An oil-emitting self-lubricating silicone rubber material, characterized in that: The oil-emitting self-lubricating silicone rubber material comprises the following raw materials in parts by mass: 100 parts of vinyl silicone rubber, 15-30 parts of vulcanizing agent, 45-55 parts of white carbon black, 10-15 parts of phenyl silicone oil, and 1-3 parts of nano metal oxide.

2. The oil-emitting self-lubricating silicone rubber material according to claim 1, characterized in that: The vulcanizing agent includes 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane.

3. The oil-emitting self-lubricating silicone rubber material according to claim 1, characterized in that: The white carbon black includes fumed white carbon black.

4. The oil-emitting self-lubricating silicone rubber according to claim 1, characterized in that: The nano metal oxide comprises nano cerium oxide.

5. A method for preparing the oil-emitting self-lubricating silicone rubber material according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step S10, putting the vinyl silicone rubber into an internal mixer for the first plasticization, then adding nano metal oxide and part of white carbon black for the second plasticization, then adding phenyl silicone oil for the third plasticization, then adding the remaining white carbon black for the fourth plasticization, discharging the material after the plasticization is completed to obtain a plasticized rubber material; Step S20, putting the plasticized rubber material into an open mixer for mixing, discharging sheets, and naturally stopping to obtain a mixed rubber material; Step S30, mixing the mixed rubber material and the vulcanizing agent again by using an open mill to produce sheets to obtain a rubber material to be vulcanized; Step S40, heating the rubber material to be vulcanized at 170-180° C. for 200-240 seconds, then heating at 180-200° C. for 3.5-4.5 hours, and cooling to obtain an oil-emitting self-lubricating silicone rubber material.

6. The method for preparing the oil-emitting self-lubricating silicone rubber material according to claim 5, characterized in that: In step S10: The mass of the part of white carbon black is 40-60% of the total mass of white carbon black.

7. The method for preparing the oil-emitting self-lubricating silicone rubber material according to claim 5, characterized in that: In step S10: The hammer pressure of the internal mixer is set to 0.4-0.6KG, and the rotor speed of the internal mixer is set to 35-45rpm; The material temperature during the first plasticizing is 55-65°C and the plasticizing time is 240-360s; The material temperature during the second plasticizing is 65-75°C and the plasticizing time is 150-240s; The material temperature during the third plasticizing is 75-85°C and the plasticizing time is 150-240s; The material temperature during the fourth plasticizing is 75-85° C., and the plasticizing time is 150-240 seconds.

8. The method for preparing the oil-emitting self-lubricating silicone rubber material according to claim 5, characterized in that: The mixing in step S20 includes: Adjust the roller spacing of the mixing mill to 1.5-2 mm, perform the coiling operation 1-2 times, perform the triangle bagging operation 3-5 times, and perform the coiling operation 3-5 times.

9. The method for preparing the oil-emitting self-lubricating silicone rubber material according to claim 5, characterized in that: In step S20: The natural parking time is 12 to 24 hours.

10. The method for preparing the oil-emitting self-lubricating silicone rubber material according to claim 5, characterized in that: The re-mixing in step S30 includes: First adjust the roller spacing of the mixing mill to 1-2mm, perform the triangle bag operation 5-6 times, then adjust the roller spacing to 3-4mm, roll the product 3-4 times to exhaust, then adjust the roller spacing to 5-6mm, roll the product 3-4 times to exhaust, then adjust the roller spacing to 4-5mm, roll the product 3-4 times to exhaust, then adjust the roller spacing to 3-4mm, roll the product 2-3 times to exhaust.

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