Composition of viscosity index improver of engine oil and preparation method thereof

Abstract

The invention relates to the field of internal combustion engine lubricating oil, and particularly discloses a composition of a viscosity index improver of engine oil and a preparation method, the preparation method comprises the following steps: S1, preparing materials: 8-13% of a hydrogenated styrene copolymer, 5-15% of ocp ethylene propylene rubber and 87-72% of 100N base oil, and the base oil is natural gas oil; s2, performing rubber pressing on the ocp ethylene propylene rubber by a high-pressure rubber pressing method, and pressing the flocculent hydrogenated styrene copolymer and the rubber-pressed ocp ethylene propylene rubber into particles; s3, 100N base oil is heated to 120 DEG C in closed stirring and shearing equipment, then the hydrogenated styrene copolymer and the ocp ethylene propylene rubber particles are poured into the closed stirring and shearing equipment, and the closed stirring and shearing equipment is sealed. According to the preparation method of the composition of the viscosity index improver of the engine oil, through specific material components, high-temperature stirring and shearing and full nitrogen protection, the viscosity decrease rate can be increased, the problem that the service life of the engine oil is short is solved, and the oil change period is prolonged.

Description

Technical Field

[0001] The invention relates to the field of internal combustion engine lubricating oil, in particular to a composition and a preparation method of a viscosity index improver for engine oil. Background Art

[0002] During the operation of the engine, lubricating oil plays a vital role. Among them, a key indicator of the use of engine lubricating oil is the viscosity drop rate, which is directly related to the long-term effectiveness of the engine oil. At present, the kinematic viscosity change rate (100℃) / % of general synthetic engine oil does not exceed ±20 (GB / T 11137) when it travels 10,000 kilometers.

[0003] However, with the advancement of science and technology and the improvement of environmental protection requirements, people have higher expectations for the service life of engine oil. The traditional 10,000-kilometer oil change period has caused energy waste to a certain extent, and the emissions generated by frequent oil changes have also brought adverse effects on the environment; in addition, the main preparation equipment in the preparation method of the existing viscosity index improver composition is a stirring or shearing device, which achieves material stirring and shearing by rotation, and a heating source is set in the jacket of the equipment for heating. Since the heating source is located outside the equipment, the existing stirring and shearing equipment is far away from the heating source when stirring and shearing. The heating effect is often slightly poor, which easily causes poor heating of the material, thereby affecting production efficiency and product quality.

[0004] Therefore, it is necessary to propose a composition and a preparation method of a viscosity index improver for engine oil to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a composition and a preparation method of a viscosity index improver for engine oil, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A method for preparing a composition of a viscosity index improver for engine oil comprises the following steps:

[0008] S1: Prepare materials, hydrogenated styrene copolymer 8-13%, OCP EPDM 5-15%, 100N base oil 87-72%, and the base oil is natural gas-to-liquids;

[0009] S2: laminating the OCP EPDM rubber by a high-pressure laminating method, and then pressing the flocculent hydrogenated styrene copolymer and the laminating OCP EPDM rubber into granules;

[0010] S3: Heat 100N base oil to 120°C in a closed stirring and shearing device, then pour in hydrogenated styrene copolymer and OCP EPDM rubber particles and seal;

[0011] S4: The stirring and shearing equipment is heated to 200-260°C, and the materials are stirred and sheared by the stirring and shearing equipment to shear the granular hydrogenated styrene copolymer and OCP EPDM rubber until the molecular chains become single chains;

[0012] The stirring and shearing device comprises a shell, a jacket on the outer periphery of the shell is provided with a heating element, a stirring mechanism is provided on the shell, the stirring mechanism comprises a stirring shaft which is rotatably connected to the middle of the inner cavity of the shell and is a hollow structure, stirring frames are evenly arranged in the circumference of the stirring shaft, stirring blades are symmetrically arranged on both sides of the stirring frame, end plates which are fixedly connected to the side walls of the stirring shaft are symmetrically arranged on the top and bottom of the stirring blades, the end plates are of a hollow structure and are connected to the stirring shaft, and a plurality of end plates located at the same end of the stirring shaft have different heights;

[0013] The invention also includes a driving mechanism for driving the stirring frame to move radially along the stirring shaft, the driving mechanism includes an inner shaft rotatably connected to the inner side of the stirring shaft and coaxial with the stirring shaft, a transmission shell is arranged on the top of the shell, the upper end of the stirring shaft extends to the top of the transmission shell, and the upper end side wall of the stirring shaft is fixedly connected to a fixing plate, the top of the fixing plate away from the stirring shaft is rotatably connected to a first gear, the upper end of the inner shaft extends to the top of the stirring shaft and is fixedly provided with a second gear meshing with the first gear, the top periphery of the transmission shell is fixedly provided with a gear ring meshing with the first gear, and the inner cavity of the end plate One end is rotatably connected to a rotating shaft, and synchronous wheels are fixedly provided on the rotating shaft and the corresponding positions of the inner shaft on the rotating shaft, and a synchronous belt is jointly provided on the synchronous wheel on the rotating shaft and the corresponding synchronous wheel on the inner shaft. The end of the rotating shaft close to the stirring frame extends to the outer side of the end plate and is fixedly provided with an incomplete gear, and racks intermittently meshing with the incomplete gear are symmetrically provided on both sides of the incomplete gear, and the ends of the two racks corresponding to the same incomplete gear are connected as a whole through an arc-shaped connecting plate, and the rack is movably connected to the outer side of the end plate, and the upper and lower ends of the stirring frame are fixedly connected to the connecting plate.

[0014] Preferably, in step S3, the internal pressure of the stirring shearing device is 3 to 5 MPa.

[0015] Preferably, in step S3, nitrogen protection is added after sealing.

[0016] Preferably, a fourth gear is fixedly provided on the portion of the stirring shaft located on the inner side of the transmission housing, a motor is provided at one end of the inner side of the transmission housing, and a third gear driven to rotate by the motor and meshing with the fourth gear is provided at the output end of the motor.

[0017] Preferably, the stirring blade is rotatably connected to the side of the stirring frame, guide shafts are symmetrically arranged on the top and bottom of the stirring blade, and the side of the end plate is provided with guide grooves that correspond to the stirring blades one by one and are inclined. One end of the guide shaft away from the stirring blade is movably guided and connected to the guide groove, so that the stirring blade tilts when the stirring frame drives the stirring blade to move.

[0018] Preferably, a linear guide rail corresponding to the rack is fixedly provided on the outer side of the end plate, and the rack and the linear guide rail are slidably guided.

[0019] Preferably, a cutting knife is vertically arranged inside the stirring frame, and the cross section of the cutting knife is cross-shaped.

[0020] Preferably, it also includes a reciprocating shearing mechanism, which includes a spiral blade arranged on the outside of the stirring shaft, and the lower end of the inner cavity of the shell is provided with a cylinder located on the outside of the lower end of the stirring shaft, and the side wall of the cylinder is fixedly connected with a fixed arm, and the other end of the fixed arm is fixed to the inner wall of the shell, and the cylinder is conical, and the lower end of the inner shaft extends to the bottom of the cylinder and is provided with a propulsion blade, and the inner wall of the lower end of the cylinder is evenly surrounded by a second blade, and the outer wall of the lower end of the stirring shaft is evenly surrounded by a first blade, and a conical guide cone is fixedly provided on the outer side of the lower end of the cylinder, and the guide cone corresponds to the blade of the propulsion blade.

[0021] Preferably, the lower end of the spiral blade extends to the inner side of the cylinder

[0022] There are multiple groups of second blades, and the multiple groups of second blades are evenly distributed along the height direction of the cylinder, and the cutting edges of the second blades are arranged upward;

[0023] There are multiple groups of the first blades, the multiple groups of first blades and the multiple groups of second blades are arranged at intervals, and the blade edges of the first blades are serrated.

[0024] A composition prepared by a method for preparing a viscosity index improver for engine oil, comprising the following raw materials in mass fractions:

[0025] 8-13% hydrogenated styrene copolymer;

[0026] 5-15% ocp ethylene propylene rubber;

[0027] 87-72% of 100N base oil, and the base oil is extracted from natural gas.

[0028] Compared with the prior art, the present invention provides a composition and a preparation method of a viscosity index improver for engine oil, which has the following beneficial effects:

[0029] 1. The preparation method of the composition of the viscosity index improver of the engine oil, by using hydrogenated styrene copolymer, OCP ethylene propylene rubber and 100N base oil extracted from natural gas as raw materials, combined with high-temperature stirring and shearing and sufficient nitrogen protection, can improve the viscosity reduction rate, solve the problem of short service life of engine oil, extend the oil change period, greatly improve the service life of engine oil, reduce energy waste, and reduce the impact of emissions on the environment.

[0030] 2. The preparation method of the composition of the viscosity index improver of the engine oil, through the specially designed stirring and shearing equipment, by setting the stirring mechanism and the driving mechanism on the stirring and shearing equipment to cooperate with each other, the displacement of the material can be achieved while stirring, the inner peripheral material is continuously displaced to the periphery, the contact opportunity with the heating element is increased, the heating uniformity is improved, and the path during stirring is continuously changed, which is helpful to improve the stirring effect, the stirring blade is arranged to rotate on the side of the stirring frame, and the guide shaft and the guide groove are arranged to open when the stirring frame moves outward, so as to facilitate pushing the inner peripheral material to the periphery, and gradually close to reduce the inclination angle during recovery, which can reduce the pushing of the peripheral material back to the inner periphery, the cross section of the cutting knife is arranged to be cross-shaped, so that the material can be sheared during rotation, and the material can be sheared when the stirring frame is radially displaced, and the reciprocating shearing mechanism can continuously transport the bottom material to the upper periphery of the shell cavity, and at the same time, the inner peripheral material at the upper end of the shell cavity is continuously transported downward for shearing, which can avoid deposition and continuously cycle shearing, thereby improving the shearing effect and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic flow chart of the preparation method of the present invention;

[0032] Figure 2 It is a structural schematic diagram of the stirring and shearing device of the present invention;

[0033] Figure 3 It is a schematic diagram of the cross-sectional structure of the shell of the stirring and shearing device of the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of the stirring and shearing device of the present invention after the shell is removed;

[0035] Figure 5 The present invention Figure 4 Schematic diagram of the structure after the top cover and transmission housing on the foundation are removed;

[0036] Figure 6 It is a schematic diagram of the structure of the stirring frame, stirring shaft and propulsion blades of the present invention in a disassembled state;

[0037] Figure 7 The present invention Figure 6 A structural diagram from another perspective based on the above;

[0038] Figure 8 It is a schematic diagram of the structure of the stirring shaft, the first gear, and the propulsion blade of the present invention in a disassembled state;

[0039] Fig. 9 It is a schematic diagram of the overall structure of the stirring frame and the end plate of the present invention;

[0040] Fig.10 It is a schematic diagram of the structure of the mixing frame and the end plate of the present invention when they are disassembled;

[0041] Fig.11 It is a schematic diagram of the structure of the stirring blade and the stirring frame of the present invention in a disassembled state;

[0042] Fig.12 It is a structural schematic diagram of one side of the end plate of the present invention;

[0043] Fig.13 It is a schematic diagram of the structure of the end plate, synchronous belt and rack of the present invention in a disassembled state;

[0044] Fig.14 It is a schematic diagram of the cross-sectional structure of the cylinder and the stirring shaft of the present invention.

[0045] In the figure: 1, shell; 2, transmission shell; 3, top cover; 4, heating element; 5, motor; 6, propulsion blade; 7, guide cone; 8, fixed arm; 9, stirring blade; 10, stirring shaft; 11, gear ring; 12, first gear; 13, second gear; 14, spiral blade; 15, third gear; 16, fourth gear; 17, end plate; 18, cylinder; 19, stirring frame; 20, inner shaft; 21, first blade; 22, fixed plate; 23, synchronous belt; 24, guide shaft; 25, cutting knife; 26, guide groove; 27, rack; 28, connecting plate; 29, incomplete gear; 30, rotating shaft; 31, second blade; 32, synchronous wheel. DETAILED DESCRIPTION

[0046] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0047] like Figure 1 As shown, the method for preparing the composition of the viscosity index improver of engine oil comprises the following steps:

[0048] S1: Prepare materials, hydrogenated styrene copolymer 8-13%, OCP EPDM 5-15%, 100N base oil 87-72%, and the base oil is natural gas-to-liquids;

[0049] S2: laminating the OCP EPDM rubber by a high-pressure laminating method, and then pressing the flocculent hydrogenated styrene copolymer and the laminating OCP EPDM rubber into granules;

[0050] Step 3: Heat 100N base oil to 120°C in a closed stirring and shearing device, then pour in hydrogenated styrene copolymer and ocp ethylene propylene rubber particles and seal the device. The internal pressure of the stirring and shearing device is 5 MPa, and nitrogen protection is added after sealing.

[0051] Step 4: The stirring and shearing equipment is heated to 200-260° C., and the materials are stirred and sheared by the stirring and shearing equipment for about 10 hours, and the granular hydrogenated styrene copolymer and ethylene-propylene rubber are sheared until the molecular chains become single chains.

[0052] According to the above preparation method, experiments were carried out using different ratios.

[0053] Example 1

[0054] Step 1: 8% hydrogenated styrene copolymer, 5% ocp ethylene propylene rubber, 87% 100N base oil, where the base oil is natural gas oil, and the ocp ethylene propylene rubber is an ethylene propylene rubber based on an olefin copolymer structure;

[0055] Step 2: laminating the OCP EPDM rubber by a high-pressure laminating method, and then pressing the flocculent hydrogenated styrene copolymer and the laminating OCP EPDM rubber into granules;

[0056] Step 3: Heat 100N base oil to 120°C in a closed stirring and shearing device, then pour in hydrogenated styrene copolymer and ocp ethylene propylene rubber particles and seal the device. The internal pressure of the stirring and shearing device is 5 MPa, and nitrogen protection is added after sealing.

[0057] Step 4: The stirring and shearing equipment is heated to 200°C, and the materials are stirred and sheared by the stirring and shearing equipment for about 10 hours, so that the granular hydrogenated styrene copolymer and ethylene-propylene rubber are sheared until the molecular chains become single chains.

[0058] Example 2

[0059] Step 1: 13% hydrogenated styrene copolymer, 15% ocp ethylene propylene rubber, 72% 100N base oil, where the base oil is natural gas oil, and the ocp ethylene propylene rubber is an ethylene propylene rubber based on an olefin copolymer structure;

[0060] Step 2: laminating the OCP EPDM rubber by a high-pressure laminating method, and then pressing the flocculent hydrogenated styrene copolymer and the laminating OCP EPDM rubber into granules;

[0061] Step 3: Heat 100N base oil to 120°C in a closed stirring and shearing device, then pour in hydrogenated styrene copolymer and ocp ethylene propylene rubber particles and seal the device. The internal pressure of the stirring and shearing device is 5 MPa, and nitrogen protection is added after sealing.

[0062] Step 4: The stirring and shearing equipment is heated to 260°C, and the materials are stirred and sheared by the stirring and shearing equipment for about 10 hours, so that the granular hydrogenated styrene copolymer and ethylene-propylene rubber are sheared until the molecular chains become single chains.

[0063] Example 3

[0064] Step 1: 9% hydrogenated styrene copolymer, 7% ocp ethylene propylene rubber, 84% 100N base oil, where the base oil is natural gas oil, and the ocp ethylene propylene rubber is an ethylene propylene rubber based on an olefin copolymer structure;

[0065] Step 2: laminating the OCP EPDM rubber by a high-pressure laminating method, and then pressing the flocculent hydrogenated styrene copolymer and the laminating OCP EPDM rubber into granules;

[0066] Step 3: Heat 100N base oil to 120°C in a closed stirring and shearing device, then pour in hydrogenated styrene copolymer and ocp ethylene propylene rubber particles and seal the device. The internal pressure of the stirring and shearing device is 5 MPa, and nitrogen protection is added after sealing.

[0067] Step 4: The stirring and shearing equipment is heated to 220°C, and the materials are stirred and sheared by the stirring and shearing equipment for about 10 hours, so that the granular hydrogenated styrene copolymer and ethylene-propylene rubber are sheared until the molecular chains become single chains.

[0068] Example 4

[0069] Step 1: 12% hydrogenated styrene copolymer, 14% ocp ethylene propylene rubber, 74% 100N base oil, where the base oil is natural gas oil, and the ocp ethylene propylene rubber is an ethylene propylene rubber based on an olefin copolymer structure;

[0070] Step 2: laminating the OCP EPDM rubber by a high-pressure laminating method, and then pressing the flocculent hydrogenated styrene copolymer and the laminating OCP EPDM rubber into granules;

[0071] Step 3: Heat 100N base oil to 120°C in a closed stirring and shearing device, then pour in hydrogenated styrene copolymer and ocp ethylene propylene rubber particles and seal the device. The internal pressure of the stirring and shearing device is 5 MPa, and nitrogen protection is added after sealing.

[0072] Step 4: The stirring and shearing equipment is heated to 250°C, and the materials are stirred and sheared by the stirring and shearing equipment for about 10 hours, so that the granular hydrogenated styrene copolymer and ethylene-propylene rubber are sheared until the molecular chains become single chains.

[0073] Example 5

[0074] Step 1: 10.5% hydrogenated styrene copolymer, 10% ocp ethylene propylene rubber, 79.5% 100N base oil, wherein the base oil is natural gas oil, and the ocp ethylene propylene rubber is an ethylene propylene rubber based on an olefin copolymer structure;

[0075] Step 2: laminating the OCP EPDM rubber by a high-pressure laminating method, and then pressing the flocculent hydrogenated styrene copolymer and the laminating OCP EPDM rubber into granules;

[0076] Step 3: Heat 100N base oil to 120°C in a closed stirring and shearing device, then pour in hydrogenated styrene copolymer and ocp ethylene propylene rubber particles and seal the device. The internal pressure of the stirring and shearing device is 5 MPa, and nitrogen protection is added after sealing.

[0077] Step 4: The stirring and shearing equipment is heated to 230°C, and the materials are stirred and sheared by the stirring and shearing equipment for about 10 hours, so that the granular hydrogenated styrene copolymer and ethylene-propylene rubber are sheared until the molecular chains become single chains.

[0078] Comparative Example 1

[0079] Step 1: 5% hydrogenated styrene copolymer, 3% ocp ethylene propylene rubber, 92% 100N base oil, where the base oil is natural gas-to-liquids, and the ocp ethylene propylene rubber is an ethylene propylene rubber based on an olefin copolymer structure;

[0080] Step 2: laminating the OCP EPDM rubber by a high-pressure laminating method, and then pressing the flocculent hydrogenated styrene copolymer and the laminating OCP EPDM rubber into granules;

[0081] Step 3: Heat 100N base oil to 120°C in a closed stirring and shearing device, then pour in hydrogenated styrene copolymer and ocp ethylene propylene rubber particles and seal the device. The internal pressure of the stirring and shearing device is 5 MPa, and nitrogen protection is added after sealing.

[0082] Step 4: The stirring and shearing equipment is heated to 190°C, and the materials are stirred and sheared by the stirring and shearing equipment for about 10 hours, so that the granular hydrogenated styrene copolymer and ethylene-propylene rubber are sheared until the molecular chains become single chains.

[0083] Comparative Example 2

[0084] Step 1: 20% hydrogenated styrene copolymer, 20% ocp ethylene propylene rubber, 60% 100N base oil, where the base oil is natural gas oil, and the ocp ethylene propylene rubber is an ethylene propylene rubber based on an olefin copolymer structure;

[0085] Step 2: laminating the OCP EPDM rubber by a high-pressure laminating method, and then pressing the flocculent hydrogenated styrene copolymer and the laminating OCP EPDM rubber into granules;

[0086] Step 3: Heat 100N base oil to 120°C in a closed stirring and shearing device, then pour in hydrogenated styrene copolymer and ocp ethylene propylene rubber particles and seal the device. The internal pressure of the stirring and shearing device is 5 MPa, and nitrogen protection is added after sealing.

[0087] Step 4: The stirring and shearing equipment is heated to 280°C, and the materials are stirred and sheared by the stirring and shearing equipment for about 10 hours, so that the granular hydrogenated styrene copolymer and ethylene-propylene rubber are sheared until the molecular chains become single chains.

[0088] Comprehensive examples 1 to 5 and comparative examples 1 to 2, the viscosity index and various indicators are compared as shown in Table 1:

[0089] Table 1

[0090]

[0091] As shown in Table 1, the present invention can improve the viscosity reduction rate through specific material components, high temperature stirring shearing and sufficient nitrogen protection, solve the service life of engine oil, extend the oil change period, greatly improve the service life of engine oil, reduce energy waste, and reduce the impact of emissions on the environment;

[0092] The viscosity index improver prepared by the above method has a shear drop rate of less than 9% after testing. The viscosity drop rates of driving tests after 23,000 kilometers, 25,000 kilometers and 30,000 kilometers are 8.75%, 8.23% and 8.12% respectively, which fully meets the international standard of less than 20%.

[0093] Based on the preparation method of the above improver composition, the reaction takes place in a specially designed stirring and shearing device, referring to Figure 2 to Figure 13 As shown:

[0094] A specially designed stirring and shearing device is used in the above production method, the stirring and shearing device includes a shell 1, a jacket on the outer periphery of the shell 1 is provided with a heating element 4, a stirring mechanism is provided on the shell 1, the stirring mechanism includes a stirring shaft 10 which is rotatably connected to the middle of the inner cavity of the shell 1 and is a hollow structure, stirring frames 19 are evenly arranged on the circumference of the stirring shaft 10, stirring blades 9 are symmetrically arranged on both sides of the stirring frame 19, end plates 17 fixedly connected to the side walls of the stirring shaft 10 are symmetrically arranged on the top and bottom of the stirring blades 9, the end plates 17 are hollow structures and communicated with the stirring shaft 10, and multiple end plates 17 located at the same end of the stirring shaft 10 have different heights, a transmission shell 2 is provided on the top of the shell 1, a fourth gear 16 is fixedly provided on the portion of the stirring shaft 10 located on the inner side of the transmission shell 2, a motor 5 is provided at one end of the inner side of the transmission shell 2, and a third gear 15 driven to rotate by the motor 5 and meshing with the fourth gear 16 is provided at the output end of the motor 5;

[0095] Furthermore, in order to improve the stirring effect and the uniformity of heating, a driving mechanism for driving the stirring frame 19 to move radially along the stirring shaft 10 is also provided, and the driving mechanism includes an inner shaft 20 rotatably connected to the inner side of the stirring shaft 10 and coaxial with the stirring shaft 10, the upper end of the stirring shaft 10 extends to the top of the transmission housing 2, and the upper end side wall of the stirring shaft 10 is fixedly connected with a fixing plate 22, and the top of the fixing plate 22 away from the end of the stirring shaft 10 is rotatably connected with the first gear 12, the upper end of the inner shaft 20 extends to the top of the stirring shaft 10 and is fixedly provided with a second gear 13 meshing with the first gear 12, the top periphery of the transmission housing 2 is fixedly provided with a gear ring 11 meshing with the first gear 12, and the top of the transmission housing 2 is provided with a top cover 3 for covering the gear ring 11, the first gear 12, and the second gear 13. One end of the inner cavity of the end plate 17 is rotatably connected with a rotating shaft 30, and a synchronous wheel 32 is fixedly provided on the rotating shaft 30 and the corresponding position of the inner shaft 20 at the rotating shaft 30, and a synchronous belt 23 is commonly provided on the synchronous wheel 32 on the rotating shaft 30 and the corresponding synchronous wheel 32 on the inner shaft 20, and the end of the rotating shaft 30 close to the stirring frame 19 extends to the outer side of the end plate 17 and is fixedly provided with an incomplete gear 29, and racks 27 intermittently meshing with the incomplete gear 29 are symmetrically provided on both sides of the incomplete gear 29, and the ends of the two racks 27 corresponding to the same incomplete gear 29 are connected as a whole through an arc-shaped connecting plate 28, and a linear guide corresponding to the rack 27 is fixedly provided on the outer side of the end plate 17, and the rack 27 cooperates with the linear guide for sliding guidance, and the upper and lower ends of the stirring frame 19 are fixedly connected to the connecting plate 28;

[0096] The coordination of the stirring mechanism and the driving mechanism on the stirring and shearing equipment can realize the displacement of materials while stirring. The inner material is continuously displaced toward the periphery, which increases the contact opportunity with the heating element 4 and improves the uniformity of heating. Moreover, the path during stirring is constantly changed, which helps to improve the stirring effect.

[0097] like Figure 10 to Figure 13 As shown, the stirring blade 9 is rotatably connected to the side of the stirring frame 19, and the guide shafts 24 are symmetrically arranged on the top and bottom of the stirring blade 9. The side of the end plate 17 is provided with a guide groove 26 which corresponds to the stirring blade 9 and is inclined. The end of the guide shaft 24 away from the stirring blade 9 is movably guided and connected to the guide groove 26, so that the stirring blade 9 is tilted when the stirring frame 19 drives the stirring blade 9 to move. The stirring blade 9 is rotated on the side of the stirring frame 19, and the guide shaft 24 and the guide groove 26 are arranged to open when the stirring frame 19 moves outward, so as to facilitate pushing the inner surrounding materials to the periphery. When recycling, it gradually closes to reduce the inclination angle, which can reduce the pushing of the peripheral materials back to the inner periphery.

[0098] like Fig.11 As shown, in order to achieve a certain shearing effect during stirring, a cutting knife 25 is vertically arranged on the inner side of the stirring frame 19, and the cross-section of the cutting knife 25 is cross-shaped. The cross-section of the cutting knife 25 can shear the material during rotation, and can shear the material when the stirring frame 19 is radially displaced.

[0099] like Figure 3 to Figure 8 , Fig.14 As shown, a reciprocating shearing mechanism is also provided, and the reciprocating shearing mechanism includes a spiral blade 14 arranged on the outside of the stirring shaft 10, and a cylinder 18 located on the outside of the lower end of the stirring shaft 10 is provided at the lower end of the inner cavity of the shell 1, and the side wall of the cylinder 18 is fixedly connected with a fixed arm 8, and the other end of the fixed arm 8 is fixed to the inner wall of the shell 1, and the cylinder 18 is conical, and the lower end of the spiral blade 14 extends to the inner side of the cylinder 18, and the lower end of the inner shaft 20 extends to the bottom of the cylinder 18 and is provided with a propulsion blade 6, and the inner wall of the lower end of the cylinder 18 is evenly surrounded by A second blade 31 is provided, and there are multiple groups of the second blades 31, and the multiple groups of the second blades 31 are evenly distributed along the height direction of the cylinder 18, and the blades of the second blades 31 are arranged upward, and the outer wall of the lower end of the stirring shaft 10 is evenly surrounded by a first blade 21, and there are multiple groups of the first blades 21, and the multiple groups of the first blades 21 are arranged at intervals from the multiple groups of the second blades 31, and the blades of the first blades 21 are serrated, and a conical guide cone 7 is fixedly provided on the outer side of the lower end of the cylinder 18, and the guide cone 7 corresponds to the blades of the propulsion blade 6;

[0100] When in use, the reciprocating shearing mechanism can continuously transport the bottom material to the outer periphery of the upper end of the inner cavity of the shell 1, and at the same time, the material inside the upper end of the inner cavity of the shell 1 is continuously transported downward for shearing, which can avoid sedimentation and achieve continuous cyclic shearing, thereby improving the shearing effect and efficiency.

[0101] In addition, the present application also relates to a composition, which is prepared by the above-mentioned method for preparing the viscosity index improver of engine oil, and comprises the following raw materials in mass fractions:

[0102] 15-20% hydrogenated styrene copolymer, 10-15% OCP EPDM rubber, 75-65% 100N base oil, and the base oil is extracted from natural gas. This is a technology that uses chemical methods to convert natural gas into liquid fuel or base oil. It belongs to the existing technology and the specific refining method will not be described in detail.

[0103] Working principle of the stirring and shearing equipment: when the material is added and enters the stirring and shearing stage, the motor 5 can realize the rotation of the stirring shaft 10 through the cooperation of the third gear 15 and the fourth gear 16, and the stirring shaft 10 drives the stirring frame 19 to rotate. The stirring frame 19 and the stirring blade 9 can achieve the stirring effect, and the fixed plate 22 will rotate with the stirring shaft 10, and then under the action of the gear ring 11, the first gear 12 rotates to drive the second gear 13 to rotate, and the second gear 13 drives the inner shaft 20 inside the stirring shaft 10 to rotate. The rotation of the inner shaft 20 will drive the synchronous wheel 32 on the inner shaft 20 to rotate, and the synchronous wheel 32 drives the synchronous wheel 32 inside the end plate 17 to rotate through the synchronous belt 23, and then the synchronous wheel 32 drives the incomplete gear 29 through the rotating shaft 30. When the incomplete gear 29 rotates, it will drive the rack 27 and the connecting plate 28 to move back and forth as a whole, and then the connecting plate 28 drives the stirring frame 19 to move back and forth along the radial direction of the stirring shaft 10, and the stirring blades 9 follow the reciprocating movement to push the material. Moreover, under the action of the guide groove 26 and the guide shaft 24, when the stirring frame 19 drives the stirring blades 9 to move outward, the stirring blades 9 on both sides are opened, so as to facilitate the outward push of the inner surrounding materials. When recycling, the stirring blades 9 on both sides are gradually closed, so that the angle is reduced, thereby reducing the inward push of the peripheral materials. In this reciprocating manner, the stirring frame 19, the stirring blades 9, and the cutting knife 25 constantly change their positions, which can not only improve the stirring effect and the shearing effect, but also make the materials close to the heating element 4, thereby increasing the heating uniformity;

[0104] In addition, when the stirring shaft 10 and the inner shaft 20 rotate, they will also drive the spiral blade 14 and the propulsion blade 6 to rotate respectively. At the same time, the stirring shaft 10 will also drive the first blade 21 to rotate. The spiral blade 14 transports the inner peripheral material downward, and after entering the cylinder 18, it can be sheared by the rotating first blade 21, and at the same time, it will collide with the fixed second blade 31, and then be sheared again. The multiple groups of first blades 21 and second blades 31 are arranged at intervals, and the material is continuously sheared by the first blade 21 and the second blade 31, and finally reaches the bottom of the cylinder 18. Then the propulsion blade 6 rotates to push the material upward. Under the action of the guide cone 7, the material surges toward the outer periphery of the upper end of the shell 1 and is heated. The peripheral material at the upper end of the inner cavity of the shell 1 will not only be pushed by the outer peripheral material of the inner cavity of the shell 1 when it moves outward, but also by the upward movement of the bottom material, so that the material at the upper peripheral will surge toward the inner periphery, and then be transported downward by the spiral blade 14. This cycle can achieve efficient shearing, stirring and heating of the material, and the uniformity is good, which greatly improves the efficiency of stirring and shearing and shortens the processing time.

[0105] It should be noted that each structure in the above-mentioned housing 1 adopts the high-temperature material known in the art, and no further elaboration is given for the details.

[0106] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for preparing a viscosity index improver for engine oil, characterized in that: The following steps are involved: S1: Prepare materials, hydrogenated styrene copolymer 8-13%, OCP EPDM 5-15%, 100N base oil 87-72%, and the base oil is natural gas-to-liquids; S2: laminating the OCP EPDM rubber by a high-pressure laminating method, and then pressing the flocculent hydrogenated styrene copolymer and the laminating OCP EPDM rubber into granules; S3: Heat 100N base oil to 120°C in a closed stirring and shearing device, then pour in hydrogenated styrene copolymer and OCP EPDM rubber particles and seal; S4: The stirring and shearing equipment is heated to 200-260°C, and the materials are stirred and sheared by the stirring and shearing equipment to shear the granular hydrogenated styrene copolymer and OCP ethylene-propylene rubber until the molecular chains become single chains; The stirring and shearing device comprises a shell (1), a jacket on the outer periphery of the shell (1) is provided with a heating element (4), a stirring mechanism is provided on the shell (1), the stirring mechanism comprises a stirring shaft (10) which is rotatably connected to the middle of the inner cavity of the shell (1) and is of a hollow structure, a stirring frame (19) is evenly arranged around the circumference of the stirring shaft (10), stirring blades (9) are symmetrically arranged on both sides of the stirring frame (19), end plates (17) which are fixedly connected to the side walls of the stirring shaft (10) are symmetrically arranged at the top and bottom of the stirring blades (9), the end plates (17) are of a hollow structure and are in communication with the stirring shaft (10), and a plurality of end plates (17) located at the same end of the stirring shaft (10) have different heights; The invention also comprises a driving mechanism for driving the stirring frame (19) to move radially along the stirring shaft (10), the driving mechanism comprising an inner shaft (20) rotatably connected to the inner side of the stirring shaft (10) and coaxial with the stirring shaft (10), a transmission shell (2) is arranged on the top of the shell (1), the upper end of the stirring shaft (10) extends to the top of the transmission shell (2), and a fixing plate (22) is fixedly connected to the upper side wall of the stirring shaft (10), and a first gear (12) is rotatably connected to the top of the fixing plate (22) away from the stirring shaft (10), the upper end of the inner shaft (20) extends to the top of the stirring shaft (10) and is fixedly provided with a second gear (13) meshing with the first gear (12), the top periphery of the transmission shell (2) is fixedly provided with a gear ring (11) meshing with the first gear (12), and one end of the inner cavity of the end plate (17) is rotatably connected to the inner side wall of the end plate (17) A rotating shaft (30) is provided. A synchronous wheel (32) is fixedly provided on the rotating shaft (30) and the inner shaft (20) at the corresponding position of the rotating shaft (30). A synchronous belt (23) is provided on the synchronous wheel (32) on the rotating shaft (30) and the corresponding synchronous wheel (32) on the inner shaft (20). An end of the rotating shaft (30) close to the stirring frame (19) extends to the outer side of the end plate (17) and is fixedly provided with an incomplete gear (29). Racks (27) intermittently meshing with the incomplete gear (29) are symmetrically provided on both sides of the incomplete gear (29). The ends of the two racks (27) corresponding to the same incomplete gear (29) are connected as a whole through an arc-shaped connecting plate (28). The rack (27) is movably connected to the outer side of the end plate (17). The upper and lower ends of the stirring frame (19) are fixedly connected to the connecting plate (28).

2. The method for preparing the viscosity index improver of engine oil according to claim 1, characterized in that: In step S3, the internal pressure of the stirring shearing device is 3 to 5 MPa.

3. The method for preparing the viscosity index improver of engine oil according to claim 2, characterized in that: In step S3, nitrogen protection is added after sealing.

4. The method for preparing the viscosity index improver of engine oil according to claim 1, characterized in that: A fourth gear (16) is fixedly arranged on the portion of the stirring shaft (10) located inside the transmission housing (2); a motor (5) is arranged at one end inside the transmission housing (2); and a third gear (15) driven to rotate by the motor (5) and meshing with the fourth gear (16) is arranged at the output end of the motor (5).

5. The method for preparing the viscosity index improver of engine oil according to claim 1, characterized in that: The stirring blade (9) is rotatably connected to the side of the stirring frame (19); guide shafts (24) are symmetrically arranged at the top and bottom of the stirring blade (9); guide grooves (26) corresponding to the stirring blades (9) and arranged obliquely are arranged on the side of the end plate (17); one end of the guide shaft (24) away from the stirring blade (9) is movably guided and connected to the guide groove (26), so that the stirring blade (9) is tilted when the stirring frame (19) drives the stirring blade (9) to move.

6. The method for preparing the viscosity index improver of engine oil according to claim 1, characterized in that: A linear guide rail corresponding to the rack (27) is fixedly arranged on the outer side of the end plate (17), and the rack (27) is slidably guided in cooperation with the linear guide rail.

7. The method for preparing the composition of the viscosity index improver of engine oil according to claim 1, characterized in that: A cutting knife (25) is vertically arranged inside the stirring frame (19), and the cross section of the cutting knife (25) is cross-shaped.

8. The method for preparing the viscosity index improver of engine oil according to claim 1, characterized in that: The invention also comprises a reciprocating shearing mechanism, the reciprocating shearing mechanism comprising a spiral blade (14) arranged on the outside of the stirring shaft (10); a cylinder (18) located on the outside of the lower end of the stirring shaft (10) is arranged at the lower end of the inner cavity of the shell (1); a fixed arm (8) is fixedly connected to the side wall of the cylinder (18); the other end of the fixed arm (8) is fixed to the inner wall of the shell (1); the cylinder (18) is conical; the lower end of the inner shaft (20) extends to the bottom of the cylinder (18) and is provided with a propulsion blade (6); a second blade (31) is evenly arranged around the inner wall of the lower end of the cylinder (18); a first blade (21) is evenly arranged around the outer wall of the lower end of the stirring shaft (10); a conical guide cone (7) is fixedly arranged on the outer side of the lower end of the cylinder (18); and the guide cone (7) corresponds to the blade of the propulsion blade (6).

9. The method for preparing the viscosity index improver of engine oil according to claim 8, characterized in that: The lower end of the spiral blade (14) extends to the inner side of the cylinder (18). There are multiple groups of the second blades (31), and the multiple groups of the second blades (31) are evenly distributed along the height direction of the cylinder (18), and the cutting edges of the second blades (31) are arranged upwards; There are multiple groups of the first blades (21), the multiple groups of first blades (21) and the multiple groups of second blades (31) are arranged at intervals, and the blade edges of the first blades (21) are serrated.

10. A composition prepared by the method for preparing a viscosity index improver for engine oil according to any one of claims 1 to 9, characterized in that: The raw materials include the following mass fractions: 8-13% hydrogenated styrene copolymer; 5-15% ocp ethylene propylene rubber; 87-72% of 100N base oil, and the base oil is extracted from natural gas.

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