A device and method for continuously preparing small-particle regenerated rubber with low Mooney rebound

Abstract

The invention discloses a device and method for continuously preparing small-particle reclaimed rubber with low Mooney rebound, comprising a base, a motor is provided on one side of the top of the base, a mounting seat is provided on the other side of the top of the base, a reduction box and a twin-screw extruder mechanism are provided at the output end of the motor, the input end of the reduction box is connected to the twin-screw extruder mechanism, and the interior of the twin-screw extruder mechanism is respectively provided with a first extrusion conveying section, a compression refining section, a shearing refinement section and a steady flow cooling conveying section; the invention realizes continuous automation of reclaimed rubber refining production, realizes the entire operation process in a closed environment, and is environmentally friendly and labor-saving; by adding supercritical carbon dioxide fluid in the compression refining section, the Mooney viscosity of the desulfurized rubber powder is greatly reduced and the cross-linked network destroyed by homogenization is destroyed, and in addition, the torque of the extruder is reduced, and the difficulty of equipment manufacturing and energy consumption are greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of reclaimed rubber, and in particular to a device and method for continuously preparing small-particle reclaimed rubber with low Mooney rebound. Background Art

[0002] Recycled rubber has always been the main way to recycle waste rubber in my country. On the one hand, it can reduce the dependence on external rubber resources, and on the other hand, it can effectively solve the "black pollution" problem of waste tire manufacturing. In 2015, the output of waste rubber tires in my country was about 300 million, with a total weight of more than 10 million tons. The preparation process of recycled rubber is divided into the desulfurization stage and the refining stage of rubber powder. The desulfurization stage is the process of selectively breaking the SS bond or CS bond of the rubber powder. The prepared desulfurized rubber powder has a certain use value, but its processing fluidity is too poor, and its mechanical properties, especially the elongation at break, are not good. Therefore, the desulfurized rubber powder needs to be further strongly sheared and refined to reduce Mooney to ensure that the reclaimed rubber has both good mechanical properties and processing fluidity. It can be seen that the refining stage is of great significance to the preparation of reclaimed rubber;

[0003] The refining extruder requires strong shearing to complete the process of refining and reducing the Mooney of the desulfurized rubber powder. The prepared reclaimed rubber has good mechanical properties and processing fluidity, but there are many problems in the current refining extrusion process: for example, the extrusion temperature of the reclaimed rubber particles is too high, about 100~120℃, the particle size is too large, it is not easy to dissipate heat, and the particles stick together and agglomerate; it is difficult to prepare granular reclaimed rubber with a Mooney viscosity lower than 60. Reclaimed rubber has a viscoelastic response unique to rubber materials, and the higher the temperature, the more it tends to be viscous. Therefore, granular reclaimed rubber extruded at too high a temperature is very easy to adhere to the surface of subsequent cooling and conveying equipment. Secondly, large-scale adhesion and agglomeration will occur between the reclaimed rubber particles. Both will affect the cooling, transportation and packaging of the granular reclaimed rubber, and even block related equipment. Secondly, reclaimed rubber is a poor conductor of heat. During the feeding of the desulfurized rubber powder, the excessive size of the particles will further affect its heat dissipation effect, and it is easy to stick together, causing the feed port to be blocked. Subsequent The heating treatment takes a long time, exacerbating the problems of the particle recycled rubber sticking together and clumping. When the isolation agent is added, the powder of the isolation agent tends to adhere to the inner wall of the feed port in large quantities, increasing the inconvenience of subsequent cleaning work and affecting the normal conveying function of the isolation agent. When the heat source inside the device overflows, it is not easy to remove it, and the directly discharged heat source will cause mixing in the working environment and affect the air quality of the surrounding environment. In addition, a major difficulty in the recycled rubber industry is that the Mooney viscosity of the recycled rubber is not a fixed value. It will increase with the extension of storage time. The Mooney viscosity is an important indicator to measure the fluidity of the recycled rubber. The larger the Mooney viscosity, the worse its fluidity. The biggest factor affecting the rebound of the Mooney viscosity of the recycled rubber is the temperature during its storage. The higher the temperature, the faster the Mooney rebound speed. Therefore, excessive extrusion temperature, excessively large extruded particles and adhesion agglomerations will greatly affect the heat dissipation of the particle recycled rubber, which will greatly shorten the effective storage time. Summary of the invention

[0004] The object of the present invention is to provide a device and method for continuously preparing small-particle reclaimed rubber with low Mooney rebound, so as to solve the related problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: comprising a base, a motor is provided on one side of the top of the base, a mounting seat is provided on the other side of the top of the base, a reduction box and a twin-screw extruder mechanism are provided at the output end of the motor, the input end of the reduction box is connected to the twin-screw extruder mechanism, a first extrusion conveying section, a compression refining section, a shearing and refining section and a steady flow cooling and conveying section are provided inside the twin-screw extruder mechanism, a toothed disk is provided on one side of the outer side of the twin-screw extruder mechanism, a rotating cutter is provided on one side of the shearing and refining section, a control console is provided on the side of the top of the base close to the motor, and a flow guide connected to the steady flow cooling and conveying section is provided on the top of the mounting seat A groove, an electric gate valve is provided on one side of the guide groove, an air pump connected to each other is provided at the bottom of the guide groove, an air guide pipe connected to each other is provided at the output end of the air pump, a feed groove connected to each other is provided on one side of the top of the twin-screw extruder mechanism, the air guide pipe extends to the inside of the feed groove, a carbon dioxide storage tank is provided at the middle position of the top of the base, an injection pump connected to each other is provided at the bottom of the compression and refining section, and the injection pump is connected to the carbon dioxide storage tank, a preheating and breaking up component is provided at the middle position of the bottom of the feed groove, a quantitative feeding component is provided on one side of the top of the twin-screw extruder mechanism, and a temperature control system is provided at the middle position of the top of the outer side of the twin-screw extruder mechanism;

[0006] A through-flow groove is provided at the middle position of the bottom of the preheating and scattering component, a servo motor is provided at the top of the through-flow groove, a rotating rod is provided at the output end of the servo motor, a driving gear is provided at the bottom of the outer side of the rotating rod, a threaded column is sleeved on one side of the bottom of the through-flow groove close to the rotating rod, a driven gear meshing with the driving gear is provided at the bottom of the outer side of the threaded column, a gear is provided at the top of the outer side of the threaded column, an internal threaded sleeve is provided on the outer side of the threaded column, a rotating ring matching with each other is provided on the outer side of the rotating rod, an annular electric heating wire is provided on the outer side of the rotating ring, a pulley block is provided on one side of the internal threaded sleeve, an annular groove is provided at the edge of the top of the feed trough, sliders are symmetrically provided on the inner side of the annular groove, a desulfurized rubber powder inlet connected to each other is provided on the side where two groups of sliders are close to each other, connecting plates are provided at the four corners of the inner bottom of the desulfurized rubber powder inlet, and a semi-arc guide seat is connected to the connecting plate, an inner gear ring meshing with the gear is provided at the edge of the bottom of the semi-arc guide seat, and a stirring rod is provided on the top of the semi-arc guide seat;

[0007] An isolation agent feeding mechanism is provided on one side of the top of the quantitative feeding component, and interconnected feed ports are provided on the top of the isolation agent feeding mechanism. A driving motor is provided at the middle position of one front end of the feed port, and the output end of the driving motor extends to the inside of the feed port and is provided with a mounting roller. Brush plates and concave feed grooves are respectively provided at the four corners of the outer side of the mounting roller, and interconnected nozzles are provided on one side of the bottom of the isolation agent feeding mechanism. The control console is electrically connected to the motor, the vacuum pump, the electric gate valve, the injection pump, the annular electric heating wire, the servo motor and the driving motor through wires.

[0008] Preferably, internal thread fixing blocks are provided on both sides of the top of the feed port, and mutually adaptable threaded rods are provided on the inner sides of the internal thread fixing blocks, and an arc-shaped clamping plate is provided on the side where the threaded rods are close to each other.

[0009] Preferably, a hollow annular guide groove is provided on the inner side of the swivel, and the hollow annular guide groove is slidably matched with the pulley block, the top and bottom of the outer side of the swivel are interconnected with the internal threaded sleeve, and the outer side of the flow groove is evenly arranged with guide holes.

[0010] Preferably, an exhaust port is provided at the top of one side of the feed trough, an air inlet is provided at the top of the other side of the feed trough, and the air inlet is connected to the air duct, an annular discharge port is provided at the edge of the bottom of the feed trough, and an expansion receiving port is provided at the top of the outer side of the desulfurized rubber powder inlet.

[0011] Preferably, a through groove is provided at the bottom of the steady flow cooling and conveying section, and the through groove and the electric gate valve are adapted to each other, and a connecting port is provided at the top of the steady flow cooling and conveying section, and the connecting port and the nozzle are adapted to each other.

[0012] Preferably, arc-shaped guide plates are provided at both ends of the inside of the feed port, and the brush plate is in contact with the inner wall of the feed port.

[0013] Preferably, the twin-screw extrusion mechanism is composed of a co-rotating twin-screw structure connected together. The twin-screw extrusion mechanism adopts a fully meshing twin-screw extruder, and the barrel of the extruder is provided with a desulfurized rubber powder inlet, a carbon dioxide gas injection port, an isolation agent addition port and a granular regenerated rubber outlet. A jacket is provided on the outside of the barrel of the twin-screw extrusion mechanism, and a barrel water inlet and a water outlet are provided on the jacket, and a thermocouple is connected to the outer wall of the barrel.

[0014] Preferably, the driving motor adopts a continuous and stable pneumatic powder spraying structure which is interconnected and coordinated with the release agent feeding mechanism.

[0015] A device and method for continuously preparing low-viscosity small-particle reclaimed rubber, wherein the desulfurized rubber powder with a Mooney viscosity of 120-200 after the desulfurization process enters a co-rotating twin-screw refining extruder through a feeding device, and the temperature of the first extrusion conveying section is controlled to be 15-45°C, the temperature of the compression refining section is 80-120°C, the pressure is 7.0-11.0Mpa, the temperature of the shearing and refining section is 15-25°C, the pressure is 2.0-5.0Mpa, the temperature of the steady flow cooling conveying section is 8-12°C, and the pressure is 1.0-2.0Mpa. 0.05%-1.0% by mass of carbon dioxide fluid is added to the compression and refining section of the extruder in cooperation with the carbon dioxide storage tank and the injection pump to make it in a supercritical carbon dioxide state, and 0.2%-2% of the isolation agent is added to the steady flow cooling and conveying section of the extruder. After the screw speed is controlled at 100-200rpm and the reaction is carried out for 1-4 minutes, the small particle reclaimed rubber with a temperature of 30-60°C and a particle diameter of 5-30mm and a Mooney viscosity of less than 60 is prepared by extruding from the extruder head.

[0016] A method for continuously preparing a small-particle reclaimed rubber device with low Mooney rebound, the steps of use are as follows:

[0017] Step 1: When the device is used, the control console is used to start the motor, the vacuum pump, the electric gate valve, the injection pump, the annular electric heating wire, the servo motor and the drive motor respectively. First, the desulfurized rubber powder enters the fully meshing co-directional twin-screw refining extruder through the feed trough. During this period, the servo motor is started to drive the rotating rod to rotate. As the rotating rod rotates, the driving gear and the driven gear are driven to mesh with each other, forcing the threaded column and the gear to rotate at the same time. The rotation of the gear is used to mesh with the inner gear ring, forcing the inner gear ring to drive the semi-arc guide seat, the desulfurized rubber powder inlet and the stirring rod to rotate under the guide sliding of the slider and the annular slide groove. The desulfurized rubber powder entering is scattered and stirred by the rotation of the stirring rod, and the scattered rubber powder is allowed to enter the feed trough under the guidance of the semi-arc guide seat for preheating;

[0018] Step 2: When the desulfurized rubber powder after being broken up enters the feed trough, the rotation of the rotating rod drives the rotating ring to rotate as a whole under the guidance of the pulley block, so that the annular electric heating wire heats the flow trough and circulates the heated gas outward. At the same time, as the threaded column rotates, the internal threaded sleeve and the pulley block are driven to rise, so that the annular electric heating wire can perform reciprocating lifting and rotating heating work, so that the desulfurized rubber powder falling in the feed trough can be preheated;

[0019] Step three: As the preheated rubber powder enters the first extrusion conveying section, it passes through the first extrusion conveying section, compression refining section, shearing refinement section and steady flow cooling conveying section after temperature control by the temperature control system in sequence to form recycled rubber. During the steady flow cooling conveying section, the driving motor drives the mounting roller and the concave feed trough to rotate as a whole, and the concave feed trough is used to quantitatively receive the falling talcum powder, and the brush plate is in contact with the inner wall of the feed port to prevent the talcum powder from adhering to the wall of the feed port. The talcum powder can be orderly fed into the nozzle with the cooperation of the isolation agent feeding mechanism for pneumatic powder spraying.

[0020] Step 4: When the heat source inside the twin-screw extruder mechanism accumulates too much and is difficult to discharge, the electric gate valve can be started to open the ventilation of the steady-flow cooling and conveying section, and the gas in the steady-flow cooling and conveying section and the twin-screw extruder mechanism can be extracted by connecting the air pump with the guide groove, and then guided from the air guide pipe to the feed trough to form waste heat utilization, and the overflowing heat source can be covered by the re-falling desulfurized rubber powder for heating, so as to carry out continuous low-Mooney recycled rubber production.

[0021] Compared with the prior art, the present invention provides a device for continuously preparing small-particle regenerated rubber with low Mooney rebound, which has the following beneficial effects:

[0022] 1. The present invention is a refining stage in the reclaimed rubber production process, which realizes the continuous automation of the reclaimed rubber refining production and realizes the entire operation process in a closed environment, which is environmentally friendly and labor-saving; by adding supercritical carbon dioxide fluid in the compression refining section, the Mooney viscosity of the desulfurized rubber powder is greatly reduced and the destroyed cross-linked network is homogenized. In addition, the torque of the extruder is reduced, and the difficulty of equipment manufacturing and energy consumption are greatly reduced; the network of the reclaimed rubber is further homogenized through the action of the shearing and refining section, which is not only beneficial to ensure product performance, but also beneficial to reduce the Mooney viscosity rebound during the later storage process; in addition, through the specially designed screw size and thread original configuration and combination, the prepared reclaimed rubber has low Mooney viscosity, low extrusion temperature, small particles, easy heat dissipation and non-sticking, easy packaging and transportation, and finally realizes the preparation of reclaimed rubber with low Mooney viscosity, small particles and small Mooney viscosity rebound during storage.

[0023] 2. The present invention utilizes the mutual cooperation of preheating and breaking up components to promote the stirring and breaking up of the conveyed desulfurized rubber powder during feeding, thereby preventing internal agglomeration and causing blockage at the feeding point. At the same time, the heating structure of the annular electric heating wire reciprocates and rotates to fill the feed trough with the heating source, preheating the falling desulfurized rubber powder, improving the subsequent temperature controllable effect, and enhancing the production efficiency of the recycled rubber. The excess heat source in the steady flow cooling and conveying section is absorbed by the control of the vacuum pump and introduced into the feed trough from the air duct to form waste heat utilization, further enhancing the functionality of the continuous processing of the device and the preheating frequency of the desulfurized rubber powder, and improving the practical value of the device.

[0024] 3. The present invention can intermittently receive and discharge the falling isolation agent through the mutual cooperation of the quantitative feeding components, and the brush plate is driven by the rotation of the mounting roller to intermittently brush the inner wall of the feed port to prevent the powder from adhering to the inner wall of the feed port. The addition of the powder spraying device prevents the small-particle regenerated rubber from agglomerating and is easier to dissipate heat. The present invention provides an energy-saving, environmentally friendly, and continuous device for the production of regenerated rubber, and the prepared regenerated rubber has stable quality and small Mooney rebound. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front cross-sectional view of the present invention;

[0026] Figure 2 For the present invention Figure 1 A magnified image of point A;

[0027] Figure 3 For the present invention Figure 1 A magnified view of point B;

[0028] Figure 4 This is a stereoscopic diagram of the desulfurized rubber powder inlet of the present invention;

[0029] Figure 5 A three-dimensional diagram of a semi-arc guide seat of the present invention;

[0030] Figure 6 It is a top cross-sectional view of the swivel of the present invention;

[0031] Figure 7 It is a top sectional view of the feed port of the present invention.

[0032] In the figure: 1. Motor; 2. Speed ​​reducer; 3. Feed trough; 4. Twin-screw extruder mechanism; 5. Air guide tube; 6. Temperature control system; 7. Toothed disc; 8. Rotating cutter; 9. Steady flow cooling conveying section; 10. Mounting seat; 11. Guide trough; 12. Vacuum pump; 13. Electric gate valve; 14. Shearing and refining section; 15. Compression and refining section; 16. Injection pump; 17. Carbon dioxide storage tank; 18. First extrusion conveying section; 19. Control console; 20. Base; 21. Through-flow trough; 211. Ring-shaped electric heating wire; 212. Rotating ring; 213. Driving gear ; 214, rotating rod; 215, driven gear; 216, threaded column; 217, internal threaded sleeve; 218, servo motor; 219, semi-arc guide seat; 2110, desulfurized rubber powder inlet; 2111, annular slide; 2112, slider; 2113, stirring rod; 2114, connecting plate; 2115, pulley block; 2116, gear; 2117, inner gear ring; 22, release agent feeding mechanism; 221, brush plate; 222, mounting roller; 223, inner concave fixed material trough; 224, feed port; 225, nozzle; 226, drive motor. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-7 The present invention provides a technical solution: a device for continuously preparing small-particle reclaimed rubber with low Mooney rebound, comprising a base 20, a motor 1 is arranged on one side of the top of the base 20, a mounting seat 10 is arranged on the other side of the top of the base 20, a reduction box 2 and a twin-screw extruder mechanism 4 are respectively arranged at the output end of the motor 1, the input end of the reduction box 2 is connected to the twin-screw extruder mechanism 4, the interior of the twin-screw extruder mechanism 4 is respectively provided with a first extrusion conveying section 18, a compression refining section 15, a shearing and thinning section 14 and a steady flow cooling and conveying section 9, a toothed disk 7 is arranged on one side of the outer side of the twin-screw extruder mechanism 4, a rotary cutter 8 is arranged on one side of the shearing and thinning section 14, a control console 19 is arranged on the top of the base 20 near the motor 1, and a control panel 19 is arranged on the top of the mounting seat 10 connected to the steady flow cooling and conveying section 9. The guide grooves 11 are interconnected with the sections 9, an electric gate valve 13 is provided on one side of the guide groove 11, an air pump 12 is interconnected at the bottom of the guide groove 11, and an air guide pipe 5 is interconnected at the output end of the air pump 12, a feed groove 3 is interconnected on one side of the top of the twin-screw extruder mechanism 4, and the air guide pipe 5 extends to the inside of the feed groove 3, a carbon dioxide storage tank 17 is provided at the middle position of the top of the base 20, an injection pump 16 is provided at the bottom of the compression and refining section 15, and the injection pump 16 is interconnected with the carbon dioxide storage tank 17, a preheating and breaking up component is provided at the middle position of the bottom of the feed groove 3, a quantitative feeding component is provided on one side of the top of the twin-screw extruder mechanism 4, and a temperature control system 6 is provided at the middle position of the top of the outer side of the twin-screw extruder mechanism 4;

[0035] A through-flow groove 21 is provided at the middle position of the bottom of the preheating and scattering component, a servo motor 218 is provided at the top of the through-flow groove 21, a rotating rod 214 is provided at the output end of the servo motor 218, a driving gear 213 is provided at the bottom of the outer side of the rotating rod 214, a threaded column 216 is sleeved on one side of the bottom of the through-flow groove 21 close to the rotating rod 214, a driven gear 215 meshing with the driving gear 213 is provided at the bottom of the outer side of the threaded column 216, a gear 2116 is provided at the top of the outer side of the threaded column 216, and an inner threaded sleeve 217 matching each other is provided on the outer side of the threaded column 216, a rotating ring 212 matching each other is provided on the outer side of the rotating rod 214, and the outer side of the rotating ring 212 An annular electric heating wire 211 is provided, a pulley block 2115 is provided on one side of the internal threaded sleeve 217, an annular chute 2111 is provided at the edge of the top of the feed trough 3, sliders 2112 are symmetrically provided on the inner side of the annular chute 2111, and mutually connected desulfurized rubber powder inlets 2110 are provided on the side where two sets of sliders 2112 are close to each other, connecting plates 2114 are provided at the four corners of the inner bottom of the desulfurized rubber powder inlet 2110, and a semi-arc guide seat 219 is connected to the connecting plate 2114, an inner gear ring 2117 meshing with the gear 2116 is provided at the edge of the bottom of the semi-arc guide seat 219, and a stirring rod 2113 is provided on the top of the semi-arc guide seat 219;

[0036] An isolating agent feeding mechanism 22 is provided on one side of the top of the quantitative feeding component, and a feed port 224 that is interconnected is provided on the top of the isolating agent feeding mechanism 22, and a driving motor 226 is provided at the middle position of one end of the front side of the feed port 224, and the output end of the driving motor 226 extends to the inside of the feed port 224 and is provided with a mounting roller 222, and brush plates 221 and concave fixed material grooves 223 are respectively provided at the four corners of the outer side of the mounting roller 222, and a nozzle 225 that is interconnected is provided on one side of the bottom of the isolating agent feeding mechanism 22, and the control console 19 is electrically connected to the motor 1, the vacuum pump 12, the electric gate valve 13, the injection pump 16, the annular electric heating wire 211, the servo motor 218 and the driving motor 226 through wires.

[0037] As a preferred solution of this embodiment: internal thread fixing blocks are provided on both sides of the top of the feed port 224, and mutually adaptable threaded rods are provided on the inner side of the internal thread fixing blocks, and an arc-shaped clamping plate is provided on the side where the threaded rods are close to each other, which is convenient for bagging or clamping the powder in the box and improving the stability of the falling material.

[0038] As a preferred solution of this embodiment: a hollow annular guide groove is provided on the inner side of the rotating ring 212, and the hollow annular guide groove is slidably matched with the pulley block 2115 to increase the fixed points of the movement of the device, the top and bottom of the outer side of the rotating ring 212 are interconnected with the internal threaded sleeve 217, and the outer side of the flow groove 21 is evenly arranged with guide holes to facilitate the discharge of the formed hot air.

[0039] As a preferred solution of this embodiment: an exhaust port is provided at the top of one side of the feed trough 3, an air inlet is provided at the top of the other side of the feed trough 3, and the air inlet is connected to the air duct 5, and an annular discharge port is provided at the edge of the bottom of the feed trough 3 to facilitate material transportation, and an expansion connecting port is provided at the top of the outer side of the desulfurized rubber powder inlet 2110 to increase the feeding range of the material.

[0040] As a preferred solution of this embodiment: a through groove is provided at the bottom of the steady flow cooling conveying section 9, and the through groove is adapted to the electric gate valve 13, and a connecting port is provided at the top of the steady flow cooling conveying section 9, and the connecting port is adapted to the nozzle 225, so as to facilitate the mutual connection and coordination of the components.

[0041] As a preferred solution of this embodiment: arc-shaped guide plates are provided at both ends of the inside of the feed port 224, and the brush plate 221 fits against the inner wall of the feed port 224 to facilitate automatic wiping of the inner wall of the brush component, thereby increasing the convenience of subsequent cleaning work.

[0042] As a preferred solution of this embodiment: the twin-screw extruder mechanism 4 is composed of a co-rotating twin-screw structure, the twin-screw extruder mechanism 4 adopts a fully meshing twin-screw extruder, and the barrel of the extruder is provided with a desulfurized rubber powder inlet, a carbon dioxide gas injection port, an isolation agent addition port and a granular regenerated rubber outlet, a jacket is provided on the outer side of the barrel of the twin-screw extruder mechanism 4, and a barrel water inlet and a water outlet are provided on the jacket, and a thermocouple is connected to the outer wall of the barrel, so that the device and various components are connected and coordinated with each other.

[0043] As a preferred solution of this embodiment: the driving motor 226 adopts a continuous and stable pneumatic powder spraying structure which is interconnected and coordinated with the release agent feeding mechanism 22 to facilitate the spraying and mixing of the powder.

[0044] A device and method for continuously preparing low-viscosity small-particle reclaimed rubber, wherein the desulfurized rubber powder with a Mooney viscosity of 120-200 after the desulfurization process enters a co-rotating twin-screw refining extruder through a feeding device, and the temperature of the first extrusion conveying section 18 is controlled to be 15-45°C, the temperature of the compression refining section 15 is controlled to be 80-120°C, the pressure is 7.0-11.0Mpa, the temperature of the shearing and refining section 14 is controlled to be 15-25°C, the pressure is 2.0-5.0Mpa, the temperature of the steady-flow cooling conveying section 9 is controlled to be 8-12°C, and the pressure is controlled to be 1.0-2.0Mpa. 0.05%-1.0% by mass of carbon dioxide fluid is added to the compression refining section 15 of the extruder in cooperation with the carbon dioxide storage tank 17 and the injection pump 16 to make it in a supercritical carbon dioxide state, and 0.2%-2% of the isolation agent is added to the steady flow cooling and conveying section 9 of the extruder, and the screw speed is controlled at 100-200rpm to react for 1-4 minutes, and then the small particle reclaimed rubber with a temperature of 30-60°C, a particle diameter of 5-30mm, and a Mooney viscosity of less than 60 is prepared by extrusion from the extruder head.

[0045] In Example 1, the desulfurized rubber powder with a Mooney viscosity of 180 enters the fully meshing co-directional twin-screw extruder 4 through a feeding device, and the temperature of the first extrusion conveying section 18 is controlled to be 25°C, the screw element is a combination of a conveying element and a meshing element, and the screw groove depth is 20mm; the temperature of the compression refining section 15 is controlled to be 100°C and the pressure is 8.0Mpa by a mold temperature meter, the screw element is a meshing block, the screw groove depth is 10mm, the temperature of the shearing and refining section 14 is 15°C and the pressure is 2.0Mpa, and the steady flow cooling conveying section 9 is The temperature is 10°C, the screw element is a combination of a conveying element and a toothed disk 7, the screw groove depth is 5mm, and the end is a toothed disk 7. 0.05% by mass of carbon dioxide fluid is added to the compression and refining section 15 of the extruder to make it in a supercritical carbon dioxide state, and 1.5% of talcum powder release agent is added to the steady flow cooling conveying section 9 of the extruder, and the screw speed is controlled at 150rpm to react for 2 minutes, and then extruded from the extruder head to prepare small particle reclaimed rubber at a temperature of 40°C and a particle diameter of 10mm;

[0046] The properties of the obtained reclaimed rubber are as follows: Mooney viscosity = 40; vulcanized according to the recycled rubber vulcanization formula GB / T 13460-2008, the mechanical properties are as follows: tensile strength = 15.3Mpa, elongation at break = 520%, the Mooney viscosity of the reclaimed rubber rebounds by 3 after 10 days of storage, and rebounds by 7 after one month of storage.

[0047] Example 2, the desulfurized rubber powder with a Mooney viscosity of 200 enters the fully meshing co-directional twin-screw extruder 4 through a feeding device, the temperature of the first extrusion conveying section 18 is controlled to be 20°C, the screw element is the conveying original, the screw groove depth is 15mm, the temperature of the compression refining section 15 is controlled to be 120°C by a mold temperature meter, the pressure is 10.0Mpa, the screw element is a meshing block, the screw groove depth is 8mm, the temperature of the shearing and thinning section 14 is 25°C, the pressure is 3.0Mpa, the temperature of the steady flow cooling conveying section 9 is 8°C, the screw element is the conveying original The combination of the screw groove and the toothed disk 7, the screw groove depth is 7mm, the end is the toothed disk 7, by adding 1.5% by mass of carbon dioxide fluid into the compression refining section 15 of the extruder to make it in a supercritical carbon dioxide state, and adding 0.5% of calcium powder and carbon black as an isolation agent into the steady flow cooling and conveying section 9 of the extruder, controlling the screw speed at 100rpm to react for 2.5 minutes, and then extruding from the extruder head to prepare small particle reclaimed rubber at a temperature of 35°C and a particle diameter of 15mm; the properties of the obtained reclaimed rubber are as follows: Mooney viscosity = 45; vulcanized according to the recycled rubber vulcanization formula GB / T 13460-2008, the mechanical properties are as follows: tensile strength = 15.8Mpa, elongation at break = 550%, the Mooney viscosity of the recycled rubber rebounded by 2 after 10 days of storage, and the Mooney viscosity rebounded by 6 after one month of storage; the properties of the obtained recycled rubber are as follows: Mooney viscosity = 45; vulcanized according to the recycled rubber vulcanization formula GB / T 13460-2008, the mechanical properties are as follows: tensile strength = 15.8Mpa, elongation at break = 550%, the Mooney viscosity of the recycled rubber rebounded by 2 after 10 days of storage, and the Mooney viscosity rebounded by 6 after one month of storage.

[0048] A method for continuously preparing a small-particle reclaimed rubber device with low Mooney rebound, the steps of use are as follows:

[0049] Step 1: When the device is used, the control console 19 is used to start the motor 1, the air pump 12, the electric gate valve 13, the injection pump 16, the annular electric heating wire 211, the servo motor 218 and the drive motor 226 respectively. First, the desulfurized rubber powder enters the fully meshed co-directional twin-screw refining extruder through the feed trough 3. During this period, the servo motor 218 is used to start the rotating rod 214. As the rotating rod 214 rotates, the driving gear 213 and the driven gear 215 are meshed with each other, forcing the threaded column 21 6 and the gear 2116 rotate simultaneously, and the rotation of the gear 2116 meshes with the inner gear ring 2117, forcing the inner gear ring 2117 to drive the semi-arc guide seat 219, the desulfurized rubber powder inlet 2110 and the stirring rod 2113 to rotate under the guidance of the slider 2112 and the annular slide 2111, and the rotation of the stirring rod 2113 is used to break up and stir the incoming desulfurized rubber powder, and the broken rubber powder is guided by the semi-arc guide seat 219 into the feed trough 3 for preheating;

[0050] Step 2: When the desulfurized rubber powder after being broken up enters the feed trough 3, the rotating ring 212 is driven to rotate as a whole under the guidance of the pulley block 2115 under the rotation of the rotating rod 214, so that the annular electric heating wire 211 heats the flow trough 21 and circulates the heated gas outward. At the same time, as the threaded column 216 rotates, the internal threaded sleeve 217 and the pulley block 2115 are driven to rise, so that the annular electric heating wire 211 can perform reciprocating lifting and rotating heating work, so that the desulfurized rubber powder falling in the feed trough 3 can be preheated;

[0051] Step three: As the preheated rubber powder enters the first extrusion conveying section 18, it passes through the first extrusion conveying section 18, the compression refining section 15, the shearing and refining section 14 and the steady flow cooling conveying section 9 after the temperature control of the temperature control system 6 in sequence to form regenerated rubber. During the steady flow cooling conveying section 9, the driving motor 226 drives the mounting roller 222 and the concave fixing groove 223 to rotate as a whole, and the concave fixing groove 223 is used to quantitatively receive the falling talcum powder, and the brush plate 221 is in contact with the inner wall of the feed port 224 to prevent the talcum powder from adhering to the wall of the feed port 224, so that the talcum powder can be orderly fed into the nozzle 225 with the cooperation of the release agent feeding mechanism 22 for pneumatic powder spraying;

[0052] Step 4: When the heat source inside the twin-screw extruder mechanism 4 accumulates too much and is difficult to discharge, the electric gate valve 13 can be started to open the steady-flow cooling and conveying section 9 for ventilation, and the air pump 12 is connected to the guide groove 11 to extract the gas in the steady-flow cooling and conveying section 9 and the twin-screw extruder mechanism 4, and guide it from the air guide pipe 5 to the feed trough 3, so as to utilize the waste heat, cover the overflowing heat source and heat the re-falling desulfurized rubber powder, and carry out continuous low Mooney recycled rubber production.

[0053] In summary: the device mainly includes a fully meshing co-rotating twin-screw refining extruder, a carbon dioxide gas injection device and a continuous and stable air pressure powder spraying device. The desulfurized rubber powder with a Mooney viscosity of 120-200 that completes the desulfurization process is greatly reduced and refined under the pressure, shear, mixing and temperature of the co-rotating twin-screw refining extruder. Through the screw size, thread element combination, powder spraying device and process control, small-particle reclaimed rubber with a Mooney viscosity of less than 60 at a temperature of 30~60℃ and a particle diameter of 5~30mm is prepared by extrusion, which greatly improves the production efficiency of the device for low Mooney reclaimed rubber and the practical value of the equipment.

[0054] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A device for continuously preparing small-particle regenerated rubber with low Mooney rebound, comprising a base (20), characterized in that: A motor (1) is provided on one side of the top of the base (20), and a mounting seat (10) is provided on the other side of the top of the base (20). A reduction box (2) and a twin-screw extruder mechanism (4) are provided at the output end of the motor (1), respectively. The input end of the reduction box (2) is interconnected with the twin-screw extruder mechanism (4). The interior of the twin-screw extruder mechanism (4) is provided with a first extrusion conveying section (18), a compression refining section (15), a shearing and thinning section (14), and a steady-flow cooling and conveying section (9). A toothed disk (7) is provided on one side of the outer side of the twin-screw extruder mechanism (4), and a rotating cutter (8) is provided on one side of the shearing and thinning section (14). A control console (19) is provided on the side of the top of the base (20) close to the motor (1). A guide groove (11) is provided on the top of the interior of the mounting seat (10) and is communicated with the steady-flow cooling and conveying section (9). The guide groove An electric gate valve (13) is provided on one side of the guide groove (11), an air pump (12) which is interconnected is provided at the bottom of the guide groove (11), and an air guide pipe (5) which is interconnected is provided at the output end of the air pump (12), a feed groove (3) which is interconnected is provided on one side of the top of the twin-screw extruder mechanism (4), and the air guide pipe (5) extends to the inside of the feed groove (3), a carbon dioxide storage tank (17) is provided at the middle position of the top of the base (20), an injection pump (16) which is interconnected is provided at the bottom of the compression and refining section (15), and the injection pump (16) and the carbon dioxide storage tank (17) are interconnected, a preheating and disintegrating component is provided at the middle position of the bottom of the feed groove (3), a quantitative feeding component is provided on one side of the top of the twin-screw extruder mechanism (4), and a temperature control system (6) is provided at the middle position of the top of the outer side of the twin-screw extruder mechanism (4); A through-flow groove (21) is provided at the middle position of the bottom of the preheating and scattering component, a servo motor (218) is provided at the top of the through-flow groove (21), a rotating rod (214) is provided at the output end of the servo motor (218), a driving gear (213) is provided at the bottom of the outer side of the rotating rod (214), a threaded column (216) is sleeved on one side of the bottom of the through-flow groove (21) close to the rotating rod (214), a driven gear (215) meshing with the driving gear (213) is provided at the bottom of the outer side of the threaded column (216), a gear (2116) is provided at the top of the outer side of the threaded column (216), and a matching internal threaded sleeve (217) is provided on the outer side of the threaded column (216), and a matching rotating ring (212) is provided on the outer side of the rotating rod (214). 2) is provided with an annular electric heating wire (211), one side of the internal threaded sleeve (217) is provided with a pulley block (2115), an annular slide groove (2111) is provided at the edge of the top of the feed trough (3), and sliders (2112) are symmetrically provided on the inner side of the annular slide groove (2111), and mutually connected desulfurized rubber powder inlets (2110) are provided on the side where two groups of sliders (2112) are close to each other, and connecting plates (2114) are provided at the four corners of the inner bottom of the desulfurized rubber powder inlet (2110), and a semi-arc guide seat (219) is connected to the connecting plate (2114), and an inner gear ring (2117) meshing with a gear (2116) is provided at the edge of the bottom of the semi-arc guide seat (219), and a stirring rod (2113) is provided on the top of the semi-arc guide seat (219); A release agent feeding mechanism (22) is provided on one side of the top of the quantitative feeding component. Interconnected feed ports (224) are provided on the top of the release agent feeding mechanism (22). A drive motor (226) is provided at the middle position of one front end of the feed port (224). The output end of the drive motor (226) extends into the interior of the feed port (224) and is provided with a mounting roller (222). Brush plates (221) and concave fixed feed grooves (223) are provided at the four corners of the outer side of the mounting roller (222). Interconnected nozzles (225) are provided on one side of the bottom of the release agent feeding mechanism (22). The control console (19) is electrically connected to the motor (1), the air extraction pump (12), the electric gate valve (13), the injection pump (16), the annular electric heating wire (211), the servo motor (218) and the drive motor (226) through wires. Wherein: internal thread fixing blocks are provided on both sides of the top of the feed port (224), and mutually adapted threaded rods are provided on the inner side of the internal thread fixing blocks, and an arc-shaped clamping plate is provided on the side where the threaded rods are close to each other. Wherein: a hollow annular guide groove is provided on the inner side of the rotating ring (212), and the hollow annular guide groove is slidably matched with the pulley block (2115); the top and bottom of the outer side of the rotating ring (212) are connected to the internal threaded sleeve (217); and the outer side of the through-flow groove (21) is evenly arranged with guide holes.

2. The device for continuously preparing small-particle reclaimed rubber with low Mooney rebound according to claim 1, characterized in that: An exhaust port is provided at the top of one side of the feed trough (3), an air inlet is provided at the top of the other side of the feed trough (3), and the air inlet is communicated with the air guide pipe (5). An annular discharge port is provided at the edge of the bottom of the feed trough (3), and an expansion receiving port is provided at the top of the outer side of the desulfurized rubber powder inlet (2110).

3. The device for continuously preparing small-particle reclaimed rubber with low Mooney rebound according to claim 1, characterized in that: A through groove is provided at the bottom of the steady flow cooling conveying section (9), and the through groove and the electric gate valve (13) are mutually compatible. A connecting port is provided at the top of the steady flow cooling conveying section (9), and the connecting port and the nozzle (225) are mutually compatible.

4. The device for continuously preparing small-particle reclaimed rubber with low Mooney rebound according to claim 1, characterized in that: Arc-shaped guide plates are provided at both ends of the inside of the feed port (224), and the brush plate (221) and the inner wall of the feed port (224) are in contact with each other.

5. The device for continuously preparing small-particle reclaimed rubber with low Mooney rebound according to claim 1, characterized in that: The twin-screw extrusion mechanism (4) is composed of a co-rotating twin-screw structure connected together. The twin-screw extrusion mechanism (4) adopts a fully meshing twin-screw extruder, and the barrel of the extruder is provided with a desulfurized rubber powder inlet, a carbon dioxide gas injection port, a release agent addition port and a particle regenerated rubber outlet. The barrel of the twin-screw extrusion mechanism (4) is provided with a jacket on the outside, and a barrel water inlet and a water outlet are provided on the jacket, and a thermocouple is connected to the outer wall of the barrel.

6. The device for continuously preparing small-particle reclaimed rubber with low Mooney rebound according to claim 1, characterized in that: The driving motor (226) adopts a continuous and stable pneumatic powder spraying structure and is interconnected and coordinated with the release agent feeding mechanism (22).

7. A method for using a device for continuously preparing small-particle reclaimed rubber with low Mooney rebound, comprising a device for continuously preparing small-particle reclaimed rubber with low Mooney rebound as claimed in any one of claims 1 to 6, and the steps of using the method are as follows: Step 1: When the device is used, the control console (19) is used to respectively start the motor (1), the air pump (12), the electric gate valve (13), the injection pump (16), the annular electric heating wire (211), the servo motor (218) and the drive motor (226). First, the desulfurized rubber powder enters the fully meshed co-rotating twin-screw refining extruder through the feed trough (3). During this period, the servo motor (218) is started to drive the rotating rod (214) to rotate. As the rotating rod (214) rotates, the driving gear (213) and the driven gear (215) are meshed with each other, forcing the threaded column ( The gear (2116) and the gear (2116) rotate simultaneously, and the rotation of the gear (2116) and the inner gear ring (2117) are meshed with each other, so that the inner gear ring (2117) drives the semi-arc guide seat (219), the desulfurized rubber powder inlet (2110) and the stirring rod (2113) to rotate under the guidance of the slider (2112) and the annular slide groove (2111), and the incoming desulfurized rubber powder is dispersed and stirred by the rotation of the stirring rod (2113), and the dispersed rubber powder is guided by the semi-arc guide seat (219) to enter the feed trough (3) for preheating; Step 2: When the desulfurized rubber powder after being broken up enters the feed trough (3), the rotation of the rotating rod (214) drives the rotating ring (212) to rotate as a whole under the guidance of the pulley block (2115), so that the annular electric heating wire (211) heats the flow trough (21) and circulates the heated gas outward. At the same time, as the threaded column (216) rotates, the internal threaded sleeve (217) and the pulley block (2115) are driven to rise, so that the annular electric heating wire (211) can perform reciprocating lifting and rotating heating work, so that the desulfurized rubber powder falling into the feed trough (3) can be preheated; Step three: As the preheated rubber powder enters the first extrusion conveying section (18), it passes through the first extrusion conveying section (18) after temperature control by the temperature control system (6), the compression refining section (15), the shearing and refining section (14) and the steady flow cooling conveying section (9) in sequence to form regenerated rubber. During the steady flow cooling conveying section (9), the driving motor (226) drives the mounting roller (222) and the inner concave fixed material groove (223) to rotate as a whole, and the inner concave fixed material groove (223) is used to quantitatively receive the falling talcum powder, and the brush plate (221) is in contact with the inner wall of the feed port (224) to prevent the talcum powder from adhering to the wall of the feed port (224). The talcum powder can be orderly fed into the nozzle (225) with the cooperation of the release agent feeding mechanism (22) to perform air pressure powder spraying; Step 4: When the heat source accumulated inside the twin-screw extruder mechanism (4) is too large to be easily discharged, the device can start the electric gate valve (13) to open the steady-flow cooling conveying section (9) for ventilation, and use the suction pump (12) to connect the guide groove (11) to the guide groove to extract the gas in the steady-flow cooling conveying section (9) and the twin-screw extruder mechanism (4), and guide it from the air guide pipe (5) to the feed groove (3), so as to utilize the waste heat, cover the overflowed heat source and heat the desulfurized rubber powder that falls again, and carry out continuous low-Mooney recycled rubber production.

Images