Preparation method of liquid silicone rubber composition

Abstract

The invention discloses a preparation method of a liquid silicone rubber composition, and particularly relates to the technical field of preparation of silicone rubber compositions.The mixing device comprises a kneading machine, a filling port and a liquid discharging port, a concentric column is installed in the kneading machine, the top end of the kneading machine is fixedly connected with a servo motor, and the servo motor is used for driving the concentric column to rotate; the outer part of the concentric column is fixedly connected with a stirring blade, the stirring blade is used for stirring materials in the kneading machine, and the kneading machine is internally provided with a separation assembly; through the arrangement of the stabilizing ring frame, the dispersing hopper, the concentric column, the stirring blades and the kneading machine, the stabilizing ring frame and the dispersing hopper guide raw materials to enter the kneading machine in an umbrella-shaped dispersing manner, the contact area with the stirring blades is enlarged, and the raw materials form more uniform material flow during discharging; the stirring blades can drive the raw materials to be quickly dispersed into the liquid silicone rubber in the stirring process, so that the time required for mixing and preparing the composition is shortened, and the preparation efficiency of the composition is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of silicone rubber composition preparation, in particular to a preparation method of liquid silicone rubber composition. BACKGROUND

[0002] In the preparation process of liquid silicone rubber composition, including filler, premixing, high-speed stirring, vacuum degassing and molding vulcanization, the silicone rubber material is usually composed of organosiloxane polymer, which has low viscosity and good fluidity. By preparing liquid silicone rubber composition, different fillers such as white carbon black, diatomite and the like can be added according to requirements. These fillers can enhance the mechanical properties of liquid silicone rubber, so that it can withstand certain external force and pressure and is not easy to break or deform. However, liquid silicone rubber composition contains many materials, so a preparation method of liquid silicone rubber composition is needed. The preparation method needs to use a mixing device to ensure that the composition is fully mixed in the mixing device. The mixing device uses a kneader to mix liquid silicone rubber and various additives, and through mechanical stirring and extrusion, the components are fully dispersed and fused. Since liquid silicone rubber itself has a certain viscosity, the material is added in large quantities into the kneader, which causes the interaction between the material and the liquid silicone rubber, and aggravates the agglomeration of the material. Therefore, due to the viscosity, the movement of the filler particles is limited, and it is difficult to quickly and uniformly disperse into the liquid silicone rubber, which increases the required time for mixing and preparation of the composition and affects the preparation efficiency of the composition. SUMMARY

[0003] The purpose of the present application is to provide a preparation method of liquid silicone rubber composition to solve the above problems in the art.

[0004] In order to achieve the above purpose, the present application provides the following technical scheme: a preparation method of liquid silicone rubber composition, comprising the following steps:

[0005] S1, according to the requirements of the formula, prepare the raw materials of liquid silicone rubber, hardener and adhesive and the like as basic components, and prepare the raw materials of liquid silicone rubber, hardener, adhesive and the like according to the requirements of the formula;

[0006] S2, put the liquid silicone rubber and raw materials into the mixing device according to a certain proportion, and use the mixing device to fully stir to ensure that the raw materials are uniformly mixed. In the stirring process, appropriate amount of solvent, additive or raw material can be added according to actual conditions to improve the mixing effect or adjust the viscosity;

[0007] S3, put the stirred mixture into a vacuum degassing machine for degassing treatment, and the degassing time and temperature should be adjusted according to the properties and bubble content of the mixture. The bubbles in the mixture can be removed to improve the quality and performance of the liquid silicone rubber composition.

[0008] S4. The degassed mixture is then poured into a mold and molded and vulcanized by heating or pressurizing.

[0009] Preferably, the mixing device includes a kneader, a filling port and a liquid discharge port, a concentric column is installed inside the kneader, a servo motor is fixedly connected to the top of the kneader, and the servo motor is used to drive the concentric column to rotate, and a stirring blade is fixedly connected to the outside of the concentric column, and the stirring blade is used to stir the material inside the kneader, and a separation component is provided inside the kneader; and the separation component is used to disperse and fill the raw materials in the filling port into the interior of the kneader, so that the stirring blade drives the raw materials to be quickly dispersed into the liquid silicone rubber during the stirring process;

[0010] The centrifugal assembly includes a long ring movably sleeved on the outside of the concentric column, a stabilizing ring frame and a dispersion hopper rotatably connected to the bottom of the stabilizing ring frame, and the stabilizing ring frame and the dispersion hopper are both located below the filling port. The stabilizing ring frame and the dispersion hopper are used to centrifugally throw out the material inside them. The interior of the stabilizing ring frame is fixedly connected to a support platform, and the support platform is used to block and collide the thrown-out material so that the material is more dispersed when thrown out. A downward moving assembly is provided between the kneader and the support platform, and the downward moving assembly is used to drive the support platform and the stabilizing ring frame to move back and forth up and down in the kneader, and to block and disperse the material inside the stabilizing ring frame. There is a support between the stabilizing ring frame and the kneader. The downward assembly cooperates with the air outlet assembly, and the air outlet assembly discharges the air inside it from the inside to the outside, so that the discharged air blows away the material near the stabilizing ring frame and the air outlet assembly, and a cooperative assembly is provided between the concentric column and the long ring; and the stabilizing ring frame and the dispersion hopper are combined to form a hopper shape, so that the stabilizing ring frame and the dispersion hopper guide the raw materials to enter the kneading machine in an umbrella shape, thereby expanding the contact area with the stirring blades, and the raw materials contact with the support platform during the flow in the stabilizing ring frame and the dispersion hopper, and then the support platform changes the flow direction of the raw materials, thereby guiding the natural diffusion of the raw materials rather than simply conveying them, so that the raw materials form a more uniform material flow when they are discharged, reducing the stratification phenomenon of different components.

[0011] Preferably, the outside of the concentric column is provided with a guide groove and a guide rod connected to the long ring, and the guide rod moves up and down along the guide groove, the outside of the long ring is sleeved with a first gear, and the outside of the dispersion hopper is fixedly sleeved with a second gear, and the second gear is engaged with the first gear; it is used to realize multi-dimensional movement of the raw materials up and down and rotation in the dispersion hopper and the stabilizing ring frame, which significantly enhances the convection and shear mixing effects, forms a composite mixing mode, thereby shortening the residence time of the raw materials in the dispersion hopper, reducing the time required for mixing the raw materials with the liquid silicone rubber, and improving the overall production efficiency.

[0012] Preferably, the top end of the support table is fixedly connected with a limiting ring seat and a rotating curved plate rotatably connected in the kneader, the bottom end of the rotating curved plate is fixedly connected with a universal seat, the inside of the universal seat movably sleeved with a second sphere, the top end of the limiting ring seat is fixedly connected with a plurality of ring-encircling plates, and a first sphere is jointly connected between the plurality of ring-encircling plates and the limiting ring seat, a diagonal rod is jointly connected between the first sphere and the second sphere, a synchronous assembly is arranged between the concentric column and the rotating curved plate, and the synchronous assembly is used to drive the rotating curved plate to rotate, a tightness assembly is arranged on the outside of the plurality of ring-encircling plates, and the tightness assembly is used to adjust the locking degree between the plurality of ring-encircling plates and the first sphere; and the plurality of ring-encircling plates are arranged in a surrounding array at the top end of the limiting ring seat, and the joint between the plurality of ring-encircling plates and the limiting ring seat is in a flexible connection state, so that the plurality of ring-encircling plates can be relatively adjusted while keeping enough flexibility at the connection end with the limiting ring seat, ensuring that the plurality of ring-encircling plates can be relatively adjusted, in addition, the diagonal rod rotates between the dispersion hopper and the stabilizing ring frame, and the first sphere can realize centered rotation at one end of the diagonal rod, so that the diagonal rod rotates in a conical surrounding state when rotating, thereby being able to collide with the raw materials falling into the inside of the stabilizing ring frame and the dispersion hopper in advance, and then the diagonal rod can fluctuate the raw materials, used to optimize the raw material flow path and improve the dispersion efficiency, thereby improving the mixing efficiency.

[0013] Preferably, the tightness assembly comprises a first arc frame and a second arc frame respectively sleeved on the outside of the ring-encircling plate, two second link frames are symmetrically sleeved on the outside of the second arc frame, two first link frames are symmetrically sleeved on the outside of the first arc frame, a threaded groove is jointly arranged between the first link frame and the second link frame, and a threaded column is screwed in the inside of the threaded groove; and the number of the threaded column and the threaded groove is communicated with the second link frame and the first link frame, so that the first arc frame and the second arc frame can be adjusted at the same time, used to synchronously relatively adjust the plurality of ring-encircling plates on the limiting ring seat, and the adjustment assembly can accurately adjust the tightness degree of the diagonal rod on the ring-encircling plate and the limiting ring seat according to the actual situation, when it is necessary to change the rotation flexibility of the dispersion hopper and the stabilizing ring frame, the friction and the degree of freedom between the diagonal rod and the ring-encircling plate and the limiting ring seat are changed through the tightness assembly, thereby realizing accurate adjustment of the dispersion hopper and the stabilizing ring frame to achieve the best working state, optimizing the discharging process of the raw materials and greatly improving the raw material adaptability of the liquid silicone rubber composition preparation equipment.

[0014] Preferably, the synchronous assembly comprises a second synchronous ring sleeved on the outside of the concentric column and a first synchronous ring installed at the top end of the rotating curved plate, a concentric ring is jointly connected between the first synchronous ring and the kneader, the concentric ring and the first synchronous ring are communicated with the inside of the filler port, and a belt is jointly sleeved between the first synchronous ring and the second synchronous ring.

[0015] Preferably, the inner part of the concentric ring and the first synchronous ring is further fixedly connected with a displacement plate, and the displacement plate is in an arc structure; and the displacement plate can effectively guide the flow path of the raw materials in the filling port, and the rotation of the displacement plate can reciprocatingly adjust the internal space of the filling port, so that the raw materials flow in a predetermined direction and trajectory, avoiding the phenomenon of dead angle or stagnation of the materials in the filling port, and ensuring that the raw materials can uniformly and smoothly enter the internal part of the stable ring frame and the dispersion hopper.

[0016] Preferably, the air outlet assembly comprises a fixed column fixedly connected in the kneader and a positioning sleeve ring installed outside the stable ring frame, the bottom end of the fixed column is fixedly connected with two symmetrical fixed plates, the bottom ends of the two fixed plates are fixedly connected with a piston sleeve column, the positioning sleeve ring is slidingly sleeved outside the fixed column, the two fixed plates and the piston sleeve column, the inner part of the positioning sleeve ring is fixedly connected with a piston rod, the piston sleeve column and the two fixed plates are formed with a piston groove for the movement of the piston rod, and the bottom of the piston sleeve column is fixedly connected with an air outlet mesh plate communicated with the inner part thereof; the raw materials discharged in the dispersion hopper can be diffused to the periphery with a larger radius, the initial distribution range of the raw materials in the kneader is increased, the movement track of the raw materials in the kneader is more complex and extensive, so that the raw materials can be more fully dispersed in the whole reaction space, the local aggregation of the raw materials is avoided, and the uniformity of the material mixing is improved.

[0017] In the above technical solution, the present application provides the technical effects and advantages:

[0018] 1. By arranging the stable ring frame, the dispersion hopper, the concentric column, the stirring blade and the kneader, the stable ring frame and the dispersion hopper can guide the raw materials to enter the kneader in an umbrella shape, the contact area with the stirring blade is enlarged, and the raw materials flow in the stable ring frame and the dispersion hopper and contact the support table, and then the support table changes the flow direction of the raw materials, thereby guiding the natural diffusion of the raw materials, rather than simply conveying the raw materials, so that the raw materials form a more uniform flow when being discharged, which is beneficial to the stirring blade to quickly disperse the raw materials into the liquid silicone rubber during stirring, reduces the required time for the preparation of the composition, and improves the preparation efficiency of the composition.

[0019] 2. By arranging the cooperative assembly, the stable ring frame, the dispersion hopper, the concentric column and the downward moving assembly, the raw materials can realize multidimensional movement in the dispersion hopper and the stable ring frame, the convection and shear mixing effects are significantly enhanced, a composite mixing mode is formed, the residence time of the raw materials in the dispersion hopper is shortened, the required time for the mixing of the raw materials and the liquid silicone rubber is reduced, and the overall production efficiency is improved.

[0020] 3、Through the setting of the rotating curved plate, the stable ring frame, the dispersion hopper and the inclined rod, the inclined rod can form a conical ring rotating state between the rotating curved plate and the dispersion hopper, so that the raw materials falling into the stable ring frame and the dispersion hopper can be collided in advance, and then the inclined rod can fluctuate the raw materials, so as to optimize the raw material flow path, improve the dispersion efficiency, improve the mixing efficiency, and further improve the composition preparation efficiency.

[0021] 4、Through the setting of the loose and tight assembly, the dispersion hopper, the stable ring frame, the inclined rod, the limiting ring seat and the ring cover plate, the tightness of the inclined rod between the ring cover plate and the limiting ring seat can be accurately adjusted according to the actual situation, when it is necessary to change the rotating flexibility of the dispersion hopper and the stable ring frame, the friction and the degree of freedom between the inclined rod and the ring cover plate and the limiting ring seat are changed, so as to realize the accurate adjustment of the dispersion hopper and the stable ring frame, so as to achieve the best working state, optimize the discharging process of the raw materials, and greatly improve the raw material adaptability of the liquid silicone rubber composition preparation equipment.

[0022] 5、Through the setting of the synchronous assembly, the cooperative assembly, the concentric column, the dispersion hopper, the long ring and the rotating curved plate, the concentric column can drive the rotating curved plate, the long ring, the cooperative assembly and the dispersion hopper to rotate at the same time, unnecessary energy transmission can be reduced, and the transmission efficiency of the equipment is improved.

[0023] 6、Through the setting of the gas outlet assembly, the stable ring frame, the dispersion hopper, the long ring and the concentric column, the raw materials around the dispersion hopper and the piston sleeve column can be blown, which is beneficial to the diffusion of the discharged raw materials in the dispersion hopper to the surrounding with a large radius, increases the initial distribution range of the raw materials in the kneader, makes the movement track of the raw materials in the kneader more complex and extensive, so that the raw materials can be more fully dispersed in the whole reaction space, avoids local aggregation of the raw materials, and improves the uniformity of material mixing. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0025] Figure 1 It is a structure schematic view of the kneader of the present application;

[0026] Figure 2 It is a structure schematic view of the concentric column and the off same assembly of the present application;

[0027] Figure 3 It is a structure schematic view of the first kind of movement angle of the rotating curved plate of the present application;

[0028] Figure 4The exploded view of the down-moving assembly of the present application;

[0029] Figure 5 The structural schematic view of the assembly of the ring plate and the first arc frame of the present application;

[0030] Figure 6 The structural schematic view of the loose-tight assembly of the present application;

[0031] Figure 7 The structural schematic view of the second motion angle of the rotating curve plate of the present application;

[0032] Figure 8 The structural schematic view of the third motion angle of the rotating curve plate of the present application;

[0033] Figure 9 The structural schematic view of the assembly of the first gear and the second gear of the present application;

[0034] Figure 10 The structural schematic view of the stable ring frame of the present application;

[0035] Figure 11 The exploded view of the cooperative assembly of the present application;

[0036] Figure 12 The partial sectional view of the positioning sleeve ring and the piston sleeve column of the present application;

[0037] Figure 13 The structural schematic view of the piston rod of the present application.

[0038] Explanation of the reference signs:

[0039] 1. Kneader; 11. Filling port; 12. Liquid outlet; 13. Concentric column; 14. Stirring blade; 15. Servo motor;

[0040] 2. Synchronization assembly; 21. Long ring; 22. Stable ring frame; 23. Dispersion hopper; 24. Support table;

[0041] 3. Down-moving assembly; 31. Ring plate; 32. First sphere; 33. Inclined rod; 34. Second sphere; 35. Universal seat; 36. Rotating curve plate; 37. Limiting ring seat;

[0042] 4. Synchronization assembly; 41. Concentric ring; 42. First synchronization ring; 43. Belt; 44. Second synchronization ring; 45. Displacement plate;

[0043] 5. Loose-tight assembly; 51. First arc frame; 52. First connection frame; 53. Threaded column; 54. Second connection frame; 55. Threaded groove; 56. Second arc frame;

[0044] 6, air outlet assembly; 61, fixing column; 62, positioning collar; 63, fixing plate; 64, piston sleeve column; 65, air outlet mesh plate; 66, piston rod; 67, piston groove;

[0045] 7, cooperative assembly; 71, guide groove; 72, guide rod; 73, first gear; 74, second gear. DETAILED DESCRIPTION

[0046] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0047] The present application provides a liquid silicone rubber composition as shown in Figure 1 and Figure 2 A preparation method of a liquid silicone rubber composition, comprising the following steps:

[0048] S1, according to the formula requirements, prepare the raw materials such as liquid silicone rubber, hardener and adhesive for the basic component, according to the formula requirements, prepare the raw materials such as liquid silicone rubber, hardener, adhesive and the like;

[0049] S2, the liquid silicone rubber and raw materials are put into the mixing device according to a certain proportion, and the mixing device is used for fully stirring, so as to ensure that the raw materials are uniformly mixed, and in the stirring process, a proper amount of solvent, additive or raw material can be added according to the actual situation, so as to improve the mixing effect or adjust the viscosity;

[0050] S3, the mixed material after stirring is put into a vacuum defoaming machine for defoaming treatment, and the defoaming time and temperature should be adjusted according to the nature and bubble content of the mixed material, so as to remove the bubbles in the mixed material and improve the quality and performance of the liquid silicone rubber composition;

[0051] S4, then the mixed material after defoaming is poured into a mold, and is formed and vulcanized by heating or pressurizing.

[0052] Referring to Figures 1-4 As shown in the figure, the mixing device comprises a kneader 1, a filler port 11 and a lower liquid port 12, a concentric column 13 is installed inside the kneader 1, a servo motor 15 is fixedly connected to the top end of the kneader 1, and the servo motor 15 is used to drive the concentric column 13 to rotate, a stirring blade 14 is fixedly connected to the outside of the concentric column 13, and the stirring blade 14 is used to stir the materials inside the kneader 1, and a centrifugal assembly 2 is arranged inside the kneader 1; and the centrifugal assembly 2 is used to disperse the raw materials in the filler port 11 into the inside of the kneader 1, so that the stirring blade 14 drives the raw materials to be quickly dispersed into the liquid silicone rubber in the stirring process;

[0053] The off same component 2 includes a long ring 21 sleeved on the outside of the concentric column 13, a stabilizing ring frame 22 provided between the long ring 21 and the kneader 1, and a dispersion hopper 23 rotatably connected to the bottom of the stabilizing ring frame 22, and the stabilizing ring frame 22 and the dispersion hopper 23 are located below the filling port 11, the stabilizing ring frame 22 and the dispersion hopper 23 are used to centrifugally throw out the materials in the interiors thereof, the stabilizing ring frame 22 is fixedly connected with a support table 24, and the support table 24 is used to block and collide the thrown-out materials, so that the materials are more dispersed when thrown out, a downward moving component 3 is provided between the kneader 1 and the support table 24, and the downward moving component 3 is used to drive the support table 24 and the stabilizing ring frame 22 to reciprocatingly move up and down along the kneader 1, and to block and disperse the materials in the interior of the stabilizing ring frame 22, an air outlet component 6 cooperating with the downward moving component 3 is provided between the stabilizing ring frame 22 and the kneader 1, and the air outlet component 6 discharges air in the interior thereof from inside to outside, so that the discharged air blows away the materials near the stabilizing ring frame 22 and the air outlet component 6, and a cooperative component 7 is provided between the concentric column 13 and the long ring 21.

[0054] When it is needed to uniformly disperse the raw materials in the interior of the kneader 1, the liquid silicone rubber and the raw materials are added into the interior of the kneader 1 through the liquid outlet 12 and the filling port 11, and then the servo motor 15 drives the concentric column 13 to rotate, at this time, the concentric column 13 drives the stirring blade 14 to synchronously rotate, which is used to agitate and mix the materials in the interior of the kneader 1, and the raw materials in the interior of the filling port 11 fall into the interiors of the stabilizing ring frame 22 and the dispersion hopper 23, and the stabilizing ring frame 22 and the dispersion hopper 23 drive the raw materials in the interiors thereof to move in multiple dimensions in the interior of the kneader 1, so as to uniformly disperse the raw materials into the interior of the kneader 1, so that the stirring blade 14 drives the raw materials to be quickly dispersed into the liquid silicone rubber in the agitation process, the raw materials can be quickly dispersed, so as to guide the natural diffusion of the raw materials, rather than simply conveying, so that the raw materials form more uniform flow when being discharged, the time required for mixing the raw materials is reduced, and the production efficiency is further improved.

[0055] Reference Figures 1-9As shown, the outer part of the concentric column 13 is provided with a guide slot 71 and a guide rod 72 connected in the long ring 21, and the guide rod 72 moves up and down along the guide slot 71, the outer part of the long ring 21 is sleeved with a first gear 73, the outer part of the dispersion hopper 23 is fixedly sleeved with a second gear 74, and the second gear 74 is engaged with the first gear 73; the top end of the support table 24 is fixedly connected with a limiting ring seat 37 and a rotary curved plate 36 rotatably connected in the kneader 1, the bottom end of the rotary curved plate 36 is fixedly connected with a universal seat 35, the inner part of the universal seat 35 is movably sleeved with a second ball 34, the top end of the limiting ring seat 37 is fixedly connected with a plurality of wrapping ring plates 31, and the plurality of wrapping ring plates 31 and the limiting ring seat 37 are jointly connected with a first ball 32, the first ball 32 and the second ball 34 are jointly connected with an inclined rod 33, the concentric column 13 and the rotary curved plate 36 are provided with a synchronous assembly 4, and the synchronous assembly 4 is used for driving the rotary curved plate 36 to rotate, the outer part of the plurality of wrapping ring plates 31 is provided with a tension assembly 5, and the tension assembly 5 is used for adjusting the locking degree between the plurality of wrapping ring plates 31 and the first ball 32; the synchronous assembly 4 includes a second synchronous ring 44 sleeved on the outer part of the concentric column 13 and a first synchronous ring 42 installed on the top end of the rotary curved plate 36, the first synchronous ring 42 and the kneader 1 are jointly connected with a concentric ring 41, and the concentric ring 41 and the first synchronous ring 42 communicate with the inner part of the filler port 11, and the first synchronous ring 42 and the second synchronous ring 44 are jointly sleeved with a belt 43; the inner part of the concentric ring 41 and the first synchronous ring 42 is also fixedly connected with a displacement plate 45, and the displacement plate 45 is in an arc structure;

[0056] When the stable ring frame 22 and the dispersion hopper 23 need to be rotated and moved up and down, first, the concentric column 13 rotates to drive the second synchronous ring 44 to rotate synchronously, and then the second synchronous ring 44 rotates to drive the belt 43 to rotate simultaneously, at this time the belt 43 rotates to drive the first synchronous ring 42 to rotate synchronously, and the first synchronous ring 42 rotates to drive the concentric ring 41 to rotate synchronously, and the rotation of the first synchronous ring 42 and the concentric ring 41 can drive the displacement plate 45 to rotate simultaneously, and then the displacement plate 45 adjusts the internal space of the filling port 11 reciprocatingly, so that the concentric column 13 rotates to drive the rotating curved plate 36 to rotate simultaneously, secondly, the rotating curved plate 36 rotates to drive the gimbal 35 to rotate synchronously, and then the gimbal 35 rotates to drive the second sphere 34 to rotate simultaneously, so that the gimbal 35 and the second sphere 34 move along the circumference below the rotating curved plate 36, at this time the gimbal 35 and the second sphere 34 rotate to drive the inclined rod 33 to rotate, at this time the rotation of the inclined rod 33 drives the first sphere 32 to rotate in the several ring plates 31 and the limiting ring seat 37, and the rotation of the inclined rod 33 pulls or pushes the first sphere 32, so that the inclined rod 33 and the first sphere 32 convert the rotary motion into linear motion, and then push or pull the several ring plates 31, the limiting ring seat 37 and the support table 24 to move upward or downward, and through the downward movement of the stable ring frame 22, the long ring 21 moves downward along the outside of the concentric column 13, then the downward movement of the long ring 21 drives the guide rod 72 to move downward along the inside of the guide groove 71, at this time the concentric column 13 rotates to drive the guide groove 71 to rotate simultaneously, then the guide groove 71 rotates to drive the guide rod 72 to rotate to drive the long ring 21 to rotate along the outside of the concentric column 13, at this time the rotation of the long ring 21 drives the first gear 73 to rotate, so that the first gear 73 rotates to mesh with the second gear 74 to drive the dispersion hopper 23 to rotate along the bottom of the stable ring frame 22, as the dispersion hopper 23 rotates, the raw materials in it rotate synchronously, then the raw materials in the dispersion hopper 23 generate centrifugal effect to be thrown out of the inside of the dispersion hopper 23 and the stable ring frame 22, so that the gimbal 35, the second sphere 34 and the inclined rod 33 rotate one revolution to drive the first sphere 32 and the support table 24 to reciprocate once along the circumference below the rotating curved plate 36, and the reciprocation makes the stable ring frame 22 and the dispersion hopper 23 move up and down between the kneader 1 and the filling port 11, then the raw materials in the dispersion hopper 23 and the stable ring frame 22 realize multi-dimensional motion of rotation and movement up and down, which significantly enhances the convection and shear mixing effect, forms a composite mixing mode, thereby shortens the residence time of the raw materials in the dispersion hopper 23, reduces the required time for mixing the raw materials with liquid silicone rubber, and improves the overall production efficiency.

[0057] Reference Figures 3-6As shown, the tension assembly 5 comprises a first arc frame 51 and a second arc frame 56 respectively sleeved outside the ring plate 31, and the outside of the second arc frame 56 is symmetrically sleeved with two second link frames 54, the outside of the first arc frame 51 is symmetrically sleeved with two first link frames 52, and the first link frame 52 and the second link frame 54 are jointly provided with a threaded groove 55, and the inside of the threaded groove 55 is screwed with a threaded column 53;

[0058] When the tension between the ring plate 31 and the limiting ring seat 37 needs to be adjusted, first, one end of the threaded column 53 is screwed into the inside of the threaded groove 55 outside the second link frame 54, and then the one end of the threaded column 53 passes through the threaded groove 55 outside the second link frame 54, at this time, the second arc frame 56 and the first arc frame 51 are close to the outside of the ring plate 31, so that the outside of the ring plate 31 and the inside of the second arc frame 56 and the first arc frame 51 are in contact with each other, at this time, the threaded column 53 is rotated to screw one end into the inside of the threaded groove 55 outside the first link frame 52, so that the first link frame 52 and the second link frame 54 are threadedly connected by the threaded column 53, and then the first arc frame 51 and the second arc frame 56 tightly contact with the ring plate 31, and then the first arc frame 51 and the second arc frame 56 push the ring plate 31 to be close to the outside of the first sphere 32, so that the tension between the ring plate 31 and the first sphere 32 is adjusted, and the tension of the inclined rod 33 between the ring plate 31 and the limiting ring seat 37 can be accurately adjusted according to the actual situation, when the rotation flexibility of the dispersion hopper 23 and the stabilizing ring frame 22 needs to be changed, the friction and the degree of freedom between the inclined rod 33 and the ring plate 31 and the limiting ring seat 37 are changed by the tension assembly 5, so that the dispersion hopper 23 and the stabilizing ring frame 22 are accurately adjusted to achieve the best working state, and the material adaptability of the liquid silicone rubber composition preparation equipment is greatly improved.

[0059] Reference Figure 3 , Figure 7 , Figure 12 and Figure 13 As shown, the air outlet assembly 6 comprises a fixed column 61 fixedly connected in the kneader 1 and a positioning sleeve ring 62 installed outside the stabilizing ring frame 22, the bottom end of the fixed column 61 is fixedly connected with two symmetric fixed plates 63, and the bottom ends of the two fixed plates 63 are fixedly connected with a piston sleeve column 64, the positioning sleeve ring 62 is sleeved outside the fixed column 61, the two fixed plates 63 and the piston sleeve column 64, the inside of the positioning sleeve ring 62 is fixedly connected with a piston rod 66, the two fixed plates 63 and the piston sleeve column 64 are formed with a piston groove 67 for the movement of the piston rod 66, and the bottom of the piston sleeve column 64 is fixedly connected with an air outlet mesh plate 65 communicated with the inside thereof;

[0060] And the stable ring frame 22 moves downward to drive the positioning ring 62 to move downward synchronously, so that the positioning ring 62 moves downward along the outside of the fixed column 61 and the two fixed plates 63, and the positioning ring 62 moves downward to drive the piston rod 66 to move along the inside of the piston groove 67, so that the piston rod 66 moves downward along the piston groove 67 inside the piston sleeve column 64, which can extrude the air inside the piston groove 67 inside the piston sleeve column 64, for compressing the air inside the piston sleeve column 64 downward, and then the air inside the piston sleeve column 64 is discharged outwardly by the air outlet mesh plate 65, so that the piston sleeve column 64 generates air flow close to the outside of the dispersion hopper 23, for blowing the raw materials around the dispersion hopper 23 and the piston sleeve column 64, which can diffuse the raw materials discharged from the dispersion hopper 23 to the four directions with a larger radius, increase the initial distribution range of the raw materials in the kneader 1, make the movement track of the kneader 1 more complex and extensive, so that the raw materials can be more fully dispersed in the entire reaction space, avoid local aggregation of the raw materials, and improve the uniformity of material mixing.

[0061] Through the above technical solutions:

[0062] In use;

[0063] First, first screw one end of the threaded column 53 into the threaded groove 55 inside the second adapter frame 54, and then the one end of the threaded column 53 passes through the threaded groove 55 inside the second adapter frame 54, at this time, the second arc frame 56 and the first arc frame 51 are close to the outside of the wrap-around plate 31, so that the outside of the wrap-around plate 31 and the inside of the second arc frame 56 and the first arc frame 51 form a mutual resistance, at this time, the threaded column 53 is screwed into the threaded groove 55 inside the first adapter frame 52, so that the first adapter frame 52 and the second adapter frame 54 are threadedly connected by the threaded column 53, and then the first arc frame 51 and the second arc frame 56 tightly resist the wrap-around plate 31, and then the first arc frame 51 and the second arc frame 56 push the wrap-around plate 31 to be close to the outside of the first sphere 32, so that the tightness between the wrap-around plate 31 and the first sphere 32 is adjusted.

[0064] Second, first, the liquid outlet 12 and the filler port 11 divide the liquid silicone rubber and the raw materials into zones and fill them into the inside of the kneader 1, and then the servo motor 15 drives the concentric column 13 to rotate, at this time, the concentric column 13 rotates to drive the stirring blade 14 to rotate in the kneader 1, so that the stirring blade 14 rotates to mix the liquid silicone rubber and the raw materials.

[0065] Thirdly, the material in the filling port 11 is guided by the inside of the concentric ring 41 and the first synchronization ring 42 after being filled into the inside of the kneader 1, at this time, the concentric ring 41 and the first synchronization ring 42 discharge the material in the inside to the inside of the stable ring frame 22 and the dispersion hopper 23, and the supporting table 24 collides and disperses the material in the inside of the dispersion hopper 23 and the stable ring frame 22, and the concentric column 13 rotates to drive the cooperative assembly 7 and the synchronization assembly 4 to rotate at the same time, and the cooperative assembly 7 rotates to drive the dispersion hopper 23 to rotate along the bottom of the stable ring frame 22, and the synchronization assembly 4 rotates to drive the downward moving assembly 3 to rotate at the same time, so that the downward moving assembly 3 pushes the supporting table 24 and keeps cooperative matching with the cooperative assembly 7, so that the stable ring frame 22 and the dispersion hopper 23 realize rotating while moving up and down on the kneader 1.

[0066] Fourthly, the stable ring frame 22 moves downward cooperatively with the air outlet assembly 6, so that the stable ring frame 22 moves downward can extrude the air in the air outlet assembly 6, and then the air outlet assembly 6 discharges the air in the inside to the outside, so that the air outlet assembly 6 generates air flow close to the outside of the dispersion hopper 23, which is used to blow the material around the dispersion hopper 23 and the air outlet assembly 6, so that the material discharged from the dispersion hopper 23 can be diffused to the four directions with a larger radius, which increases the initial distribution range of the material in the kneader 1.

[0067] The above only describes certain exemplary embodiments of the present application in a descriptive way, undoubtedly, for ordinary skilled in the art, the described embodiments can be modified in various ways without departing from the spirit and scope of the present application, therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of the claims of the present application.

Claims

1. A method for preparing a liquid silicone rubber composition, characterized in that: The following steps are involved: S1. Prepare the basic components of liquid silicone rubber, hardener, adhesive and other raw materials according to the formula requirements. Prepare the basic components of liquid silicone rubber, hardener, adhesive and other raw materials according to the formula requirements. S2. Put the liquid silicone rubber and raw materials into a mixing device in a certain proportion, use the mixing device to fully stir them to ensure that the raw materials are mixed evenly. During the stirring process, an appropriate amount of solvent, additive or raw material can be added according to the actual situation to improve the mixing effect or adjust the viscosity; S3. Place the stirred mixture into a vacuum degassing machine for degassing. The degassing time and temperature should be adjusted according to the properties of the mixture and the bubble content. This can remove bubbles in the mixture and improve the quality and performance of the liquid silicone rubber composition. S4. The degassed mixture is then poured into a mold and molded and vulcanized by heating or pressurizing.

2. The mixing device for the preparation method of a liquid silicone rubber composition according to claim 1, characterized in that: The mixing device comprises a kneader (1), a filling port (11) and a liquid outlet (12); a concentric column (13) is installed inside the kneader (1); a servo motor (15) is fixedly connected to the top of the kneader (1), and the servo motor (15) is used to drive the concentric column (13) to rotate; a stirring blade (14) is fixedly connected to the outside of the concentric column (13); and a separation component (2) is provided inside the kneader (1); The centrifugal assembly (2) includes a long ring (21) movably sleeved on the outside of the concentric column (13), a stabilizing ring frame (22) and a dispersion hopper (23) rotatably connected to the bottom of the stabilizing ring frame (22) are provided between the long ring (21) and the kneader (1), and the stabilizing ring frame (22) and the dispersion hopper (23) are both located below the filling port (11), and the stabilizing ring frame (22) and the dispersion hopper (23) are used to centrifugally throw out the material therein, and the interior of the stabilizing ring frame (22) is fixedly connected to a support platform (24), and the support platform (24) is used to block and collide the thrown material so that the material is more dispersed when thrown out. A downward moving assembly (3) is provided between the kneading machine (1) and the support platform (24), and the downward moving assembly (3) is used to drive the support platform (24) and the stabilizing ring frame (22) to move back and forth along the inside of the kneading machine (1), and to block and disperse the material inside the stabilizing ring frame (22). An air outlet assembly (6) that cooperates with the downward moving assembly (3) is provided between the stabilizing ring frame (22) and the kneading machine (1), and the air outlet assembly (6) discharges the air inside it from the inside to the outside, so that the discharged air blows away the material near the stabilizing ring frame (22) and the air outlet assembly (6). A cooperative assembly (7) is provided between the concentric column (13) and the long ring (21).

3. The mixing device for the preparation method of a liquid silicone rubber composition according to claim 1, characterized in that: The concentric column (13) is provided with a guide groove (71) and a guide rod (72) connected to the long ring (21), and the guide rod (72) moves up and down along the guide groove (71). The long ring (21) is provided with a first gear (73) on the outside. The dispersion hopper (23) is fixedly provided with a second gear (74) on the outside, and the second gear (74) is meshed with the first gear (73).

4. The mixing device for the preparation method of a liquid silicone rubber composition according to claim 2, characterized in that: The top of the support platform (24) is fixedly connected to a limiting ring seat (37) and a rotating curved plate (36) rotatably connected to the kneading machine (1); the bottom of the rotating curved plate (36) is fixedly connected to a universal seat (35); the interior of the universal seat (35) is movably sleeved with a second sphere (34); the top of the limiting ring seat (37) is fixedly connected to a plurality of ring plates (31); a first sphere (32) is commonly connected between the plurality of ring plates (31) and the limiting ring seat (37); an inclined rod (33) is commonly connected between the first sphere (32) and the second sphere (34); a synchronization component (4) is provided between the concentric column (13) and the rotating curved plate (36); the synchronization component (4) is used to drive the rotating curved plate (36) to rotate; a loosening component (5) is provided on the outside of the plurality of ring plates (31); and the loosening component (5) is used to adjust the degree of locking between the plurality of ring plates (31) and the first sphere (32).

5. The mixing device for the preparation method of a liquid silicone rubber composition according to claim 4, characterized in that: The tensioning assembly (5) comprises a first arc frame (51) and a second arc frame (56) respectively sleeved on the outside of the ring plate (31); two second connecting frames (54) are symmetrically sleeved on the outside of the second arc frame (56); two first connecting frames (52) are symmetrically sleeved on the outside of the first arc frame (51); a threaded groove (55) is provided between the first connecting frames (52) and the second connecting frames (54); a threaded column (53) is screwed inside the threaded groove (55).

6. The mixing device for the preparation method of a liquid silicone rubber composition according to claim 4, characterized in that: The synchronization assembly (4) includes a second synchronization ring (44) sleeved on the outside of the concentric column (13) and a first synchronization ring (42) installed on the top of the rotating curved plate (36), the first synchronization ring (42) and the kneading machine (1) are connected to a concentric ring (41), and the concentric ring (41) and the first synchronization ring (42) are communicated with the inside of the filling port (11), and a belt (43) is sleeved between the first synchronization ring (42) and the second synchronization ring (44).

7. The mixing device for the preparation method of a liquid silicone rubber composition according to claim 4, characterized in that: A displacement plate (45) is also fixedly connected to the interior of the concentric ring (41) and the first synchronization ring (42), and the displacement plate (45) is in an arc-shaped structure.

8. The mixing device for the preparation method of a liquid silicone rubber composition according to claim 4, characterized in that: The air outlet assembly (6) includes a fixed column (61) fixedly connected to the kneading machine (1) and a positioning collar (62) installed on the outside of the stabilizing ring frame (22), the bottom end of the fixed column (61) is fixedly connected to two symmetrical fixed plates (63), and the bottom ends of the two fixed plates (63) are fixedly connected to a piston sleeve (64), the positioning collar (62) is slidably sleeved on the outside of the fixed column (61), the two fixed plates (63) and the piston sleeve (64), the interior of the positioning collar (62) is fixedly connected to a piston rod (66), the two fixed plates (63) and the piston sleeve (64) are formed with piston grooves (67) for the piston rod (66) to move, and the bottom of the piston sleeve (64) is fixedly connected to an air outlet mesh plate (65) communicating with the interior thereof.

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