Production method of high-performance regenerated rubber particles

Abstract

The invention belongs to the field of rubber particle production methods, and particularly relates to a high-performance regenerated rubber particle production method. The method comprises the following steps: firstly, mixing rubber powder and activated oil through an ingredient stirring system according to the production proportioning requirement; secondly, performing desulfurization and activation treatment on the mixture at high temperature through a double-screw desulfurization machine; then, mixing the desulfurized and activated mixture with liquid glue and EVA (Ethylene Vinyl Acetate) by using an auxiliary material mixing system, shearing and extruding to form a rubber strip; then, the rubber strips are sheared into rubber particles through an underwater pelletizing system, and the rubber particles are cooled through a water path and then conveyed to a drying and packaging system; and finally, the rubber particles are dried, weighed and packaged in a drying and packaging system, and the whole production process is completed. According to the method, line production is carried out through an automatic production line in the production process, the overall turnover speed is high, production efficiency is high, leakproofness is high, and safety quality is controllable.

Description

Technical Field

[0001] The invention belongs to the field of rubber particle production methods, in particular to a high-performance recycled rubber particle production method. Background Art

[0002] With the development of modern industry, the amount of waste automobile tires continues to increase, and the requirements for engineering quality are increasing. Adding recycled rubber particles as an important additive to traditional petroleum asphalt has a significant effect on extending the life of the road and improving durability. As an important component of modified asphalt, rubber particles are used in large quantities and are highly practical in my country's highways. The quality of rubber particles directly affects the durability and functionality of the road. The traditional high-temperature and high-pressure dynamic desulfurization tank method has the disadvantages of complex production and long cycle. Rubber particles are widely used because of their simple production, large proportion of petroleum asphalt can be mixed at normal pressure, high solubility, and short cycle.

[0003] Traditionally, the production process of recycled rubber includes the collection, desulfurization, mixing, pelletizing and packaging of rubber powder. These steps are carried out under different production conditions and often rely on manual operation and relatively primitive mechanical equipment. Existing technologies may have the following disadvantages:

[0004] 1) Traditional recycled rubber production often relies on manual operations, which is not only inefficient but also susceptible to human errors.

[0005] 2) Due to the lack of precise control and automation, the steps of raw material proportioning, mixing, desulfurization and mixing may not ensure consistency, resulting in fluctuations in product quality.

[0006] 3) Old desulfurization and drying equipment may not be energy-efficient enough, resulting in high energy consumption in the production process.

[0007] 4) Some traditional desulfurization technologies may produce harmful waste gas and wastewater, causing environmental pollution.

[0008] 5) In a manual operation environment, safety is difficult to fully guarantee, especially in dangerous operations such as high-temperature desulfurization. Summary of the invention

[0009] In view of the deficiencies in the prior art, the object of the present invention is to provide a method for producing high-performance recycled rubber particles.

[0010] The technical solution of the present invention is as follows:

[0011] A method for producing high-performance recycled rubber particles comprises: mixing rubber powder and activation oil used for recycled rubber particles through a batching and mixing system according to production ratio requirements; performing high-temperature desulfurization and activation of the mixed material after batching and mixing through a desulfurization and activation system; mixing, shearing and extruding the desulfurized and activated mixed material with liquid rubber and EVA through an auxiliary material mixing system to fully blend them, and extruding rubber strips; shearing the rubber strips extruded by the auxiliary material mixing system into rubber particles through an underwater pelletizing system, cooling the rubber particles through a water channel and conveying them to a drying and packaging system; drying the rubber particles after underwater pelletizing through the drying and packaging system, and weighing and packaging them.

[0012] Furthermore, the mixing of ingredients includes: preparing the required types and quantities of rubber powder and activation oil; weighing the rubber powder and activation oil according to a predetermined formula ratio, wherein the rubber powder accounts for between 70% and 95% of the total weight, and the proportion of the activation oil is between 5% and 30% of the total weight; conveying the weighed raw materials to a mixing tank, and using a stirrer to mix and stir the rubber powder and the activation oil.

[0013] Furthermore, the batching and mixing system comprises:

[0014] Batching module: equipped with high-energy and high-precision weighing equipment and raw material warehouse or storage tank;

[0015] Mixing module: includes one or more mixing tanks equipped with a stirrer;

[0016] Raw material conveying module: pneumatic conveying, screw conveying or belt conveying;

[0017] Mixing control module: adopt PLC control system.

[0018] Furthermore, the high-temperature desulfurization activation includes: preheating the twin-screw desulfurizer of the desulfurization activation system; releasing sulfur from the rubber in the twin-screw desulfurizer through the action of high temperature and shear force; adding an appropriate amount of activator to the twin-screw desulfurizer during the desulfurization process, the activator being between 0.5% and 5% of the total weight of the rubber powder; monitoring the desulfurization activation process and cooling the material after desulfurization activation.

[0019] Furthermore, the desulfurization activation system:

[0020] Desulfurization module: using twin-screw desulfurizer;

[0021] Activator adding module: controls the amount and time of adding activator;

[0022] Control and monitoring module: including temperature monitoring and pressure monitoring.

[0023] Furthermore, the rubber strip molding includes: preheating a mixer of an auxiliary material mixing system; inputting a mixed material and adding auxiliary materials; extruding the rubber strip after mixing and cooling the extruded rubber strip.

[0024] Furthermore, the auxiliary material mixing system comprises:

[0025] Mixing module: for mixer and auxiliary material adding system;

[0026] Extrusion module: responsible for extruding the mixed rubber mixture into strips;

[0027] Mixing control module: including temperature control and pressure control.

[0028] Furthermore, the processing of the rubber particles includes: the underwater pelletizing system adjusts the rotation speed and spacing of the cutter to cut the rubber particles; and the cut rubber particles are screened and classified.

[0029] Furthermore, the underwater pelletizing system comprises:

[0030] Cutting module: a pelletizer for underwater cutting;

[0031] Cooling module: used to quickly cool the cut rubber particles.

[0032] Furthermore, the drying and packaging system:

[0033] Drying module: Use a dryer to remove moisture from rubber particles;

[0034] Weighing module: The weighing module is responsible for weighing the rubber particles after drying;

[0035] Packing module: Use a packing machine to pack the weighed rubber particles.

[0036] The beneficial effects of the present invention are as follows: through precise mixing of ingredients and high-temperature desulfurization and activation, the full mixing and activity recovery of rubber powder and activation oil are ensured, thereby improving the physical properties and processing properties of recycled rubber particles. By utilizing a process combining an auxiliary material mixing system with an underwater pelletizing system, this technology achieves uniform mixing, shearing, extrusion and precise cutting of rubber strips, effectively avoiding the problems of overheating and adhesion of rubber particles during the production process. At the same time, through underwater cooling and transportation, the molding quality of rubber particles is guaranteed, and the stability and consistency of the product are improved. The automated operation of the drying and packaging system not only improves production efficiency, but also ensures the accuracy of product weight through precise weighing, meeting the needs of different application scenarios. The automation and precise control of the entire production process reduces manual intervention and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1A flow chart of a method for producing high-performance recycled rubber particles;

[0038] Figure 2 This is a flow chart of step S100 of the present invention;

[0039] Figure 3 This is a flow chart of step S200 of the present invention;

[0040] Figure 4 This is a flow chart of step S300 of the present invention;

[0041] Figure 5 This is a flow chart of step S400 of the present invention;

[0042] Figure 6 This is a flow chart of step S400 of the present invention. DETAILED DESCRIPTION

[0043] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific embodiments:

[0044] Example 1

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] like Figure 1 As shown, the present invention provides a method for producing high-performance recycled rubber particles, the operating steps comprising:

[0047] S100. Rubber powder and activated oil are mixed with recycled rubber particles according to the production ratio requirements through a batching and mixing system;

[0048] S200. After the mixing is completed, the mixture is desulfurized and activated by a desulfurization activation system at high temperature;

[0049] S300. The desulfurized activated mixture is mixed, sheared, extruded, and fully blended with the liquid rubber and EVA by using the auxiliary material mixing system, and the rubber strip is extruded;

[0050] S400. The rubber strips extruded from the auxiliary material mixing system are sheared into rubber particles by an underwater pelletizing system, and the rubber particles are cooled and transported to a drying and packaging system by water;

[0051] S500. The rubber particles after underwater pelletizing are dried by a drying and packaging system, and then weighed and packaged.

[0052] The specific technical contents of each step are as follows:

[0053] S100 is the starting step of the production method of high-performance recycled rubber particles, namely the batching and mixing process. This step involves using a batching and mixing system to mix and stir rubber powder and activation oil in a certain proportion to form a uniform raw material mixture, which provides a basis for subsequent desulfurization, activation and mixing.

[0054] like Figure 2 As shown, the steps of S100 are as follows:

[0055] S110 is raw material preparation, specifically, preparing the required types and quantities of rubber powder and activated oil according to production requirements. The raw materials should meet quality standards, be free of impurities, and be stored in suitable conditions to maintain stable raw material performance.

[0056] S120 weighs the raw materials, using high-precision weighing equipment to weigh rubber powder and activated oil according to the predetermined formula ratio. The formula ratio is: rubber powder accounts for 70% to 95% of the total weight, and the proportion of activated oil is between 5% and 30% of the total weight. The weighing accuracy must reach ±0.1% to ensure the accuracy of the ratio.

[0057] S130 is for raw material transportation, specifically, using pneumatic conveying, screw conveying or belt conveying to transport the weighed raw materials to the mixing tank. Secondary contamination and loss of raw materials should be avoided during the transportation process.

[0058] S140 is stirring and mixing. Specifically, in a stirring tank, a stirrer is used to mix and stir rubber powder and activated oil. The stirring speed and time need to be precisely controlled to ensure uniform mixing. The stirring process is monitored in real time through the PLC control system and operation interface to ensure that the stirring conditions meet the process requirements.

[0059] S150 is the transfer of the mixed material after the mixing is completed. Specifically, after the mixing is completed, the mixed material is transferred to the next production link using a valve or conveying equipment.

[0060] Based on the above steps, a batching and mixing system is used to automate the operation of S100. The batching and mixing system includes:

[0061] Batching module: responsible for accurately weighing raw materials such as rubber powder and activated oil according to the predetermined formula ratio, equipped with high-energy and high-precision weighing equipment and raw material warehouse or storage tank.

[0062] Mixing module: includes one or more mixing tanks equipped with agitators, such as a propeller agitator or a paddle agitator.

[0063] Raw material conveying module: pneumatic conveying, screw conveying or belt conveying;

[0064] Mixing control module: adopts PLC control system, responsible for the automatic control of the entire batching and mixing process.

[0065] S200 uses a desulfurization activation system to perform high-temperature desulfurization activation treatment on the mixed material after S100 stirring and mixing.

[0066] like Figure 3 As shown, the specific steps include:

[0067] S210 is the preheating of the twin-screw desulfurizer. Specifically, before the mixed material enters the desulfurizer, the desulfurizer is preheated to reach the required working temperature to ensure the desulfurization effect. At the same time, preheating can shorten the desulfurization time and improve production efficiency.

[0068] S220 is a high-temperature desulfurization treatment. Specifically, in a twin-screw desulfurizer, sulfur is released from the rubber through the action of high temperature and shear force. The temperature and pressure in the desulfurizer, as well as the residence time of the mixture in the machine, must be strictly controlled. The temperature in the twin-screw desulfurizer is generally controlled between 150°C and 235°C. This temperature range helps release sulfur while avoiding excessive pyrolysis of rubber. The pressure in the twin-screw desulfurizer is maintained at 1 to 10 bar, and the residence time of the mixture in the desulfurizer is usually between 1 and 3 minutes.

[0069] S230 is the addition of activator, specifically, in the process of desulfurization, a proper amount of activator is added to the desulfurizer at the right time. The addition ratio of activator is usually low, between 0.5% and 5% of the total weight of rubber powder. The addition of activator can significantly improve the plasticity and fluidity of rubber and improve its processing performance.

[0070] S240 is used to monitor the desulfurization activation process. Through the control and monitoring module, the temperature, pressure and flow state of the mixture in the desulfurizer are monitored in real time. Real-time monitoring helps to promptly discover and adjust abnormal situations that may occur during the desulfurization activation process to ensure product quality.

[0071] S250 is the cooling of the material after desulfurization and activation, specifically, the mixed material after desulfurization and activation is discharged from the desulfurizer and cooled.

[0072] Based on the above steps, a desulfurization activation system is used to automate the operation of S200. The main purpose of the desulfurization activation system is to remove sulfur from rubber and improve the processing properties of rubber through activation treatment. The desulfurization activation system includes:

[0073] Desulfurization module: A twin-screw desulfurizer is used to remove sulfur through high temperature and shear force.

[0074] Activator addition module: accurately control the amount and time of activator addition.

[0075] Control and monitoring module: including temperature monitoring and pressure monitoring, real-time monitoring of the temperature and internal pressure in the desulfurizer.

[0076] S300 mainly involves using an auxiliary material mixing system to mix the desulfurized and activated rubber mixture with liquid rubber, EVA and other auxiliary materials and process them into rubber strips.

[0077] like Figure 4 As shown, the specific steps include:

[0078] S310 is for auxiliary material preparation, specifically, preparing the required liquid glue, EVA and other auxiliary materials according to the formula requirements, and ensuring that their quality meets the production standards.

[0079] S320 is for preheating the mixer. Before mixing, the mixer is preheated to reach the required working temperature.

[0080] S330 is the input of the mixed material. The desulfurized and activated rubber mixture is put into the mixer. The input process must be uniform and continuous to avoid air mixing. Uniform input helps to improve mixing efficiency and reduce the generation of bubbles and uneven areas.

[0081] S340 is for the addition of auxiliary materials. Specifically, during the mixing process, liquid rubber, EVA and other auxiliary materials are added to the mixer at the right time. Accurate addition of auxiliary materials helps to achieve uniform mixing of rubber and auxiliary materials and improve the performance of the final product.

[0082] S350 is the mixing process, specifically, in the mixer, the rubber and the auxiliary materials are fully mixed through mechanical action (such as shearing and extrusion). The sufficient mixing ensures the uniform mixing of the rubber and the auxiliary materials, laying the foundation for the production of high-quality recycled rubber particles.

[0083] S360 is for the extrusion of rubber strips. Specifically, the kneaded rubber mixture is extruded into strips through an extruder. Uniform extrusion helps to improve the efficiency of the subsequent pelletizing process and product quality.

[0084] S370 is cooling the extruded rubber strip, specifically, the extruded rubber strip is cooled by a cooling device to fix its shape.

[0085] Based on the above steps, the auxiliary material mixing system includes:

[0086] Mixing module: It is a mixer and auxiliary material adding system. The mixer provides the necessary shear force and temperature control. The auxiliary material adding system is used to add liquid glue, EVA and other auxiliary materials into the mixer in proportion.

[0087] Extrusion module: responsible for extruding the mixed rubber mixture into strips.

[0088] Mixing control module: including temperature control and pressure control, controls the mixing process and ensures the mixing effect.

[0089] S400 uses an underwater pelletizing system to cut the rubber strips extruded from the auxiliary material mixing system into rubber particles, and then cools the rubber particles through water channels and transports them to the drying and packaging system.

[0090] like Figure 5 As shown, specifically including:

[0091] S410 is the adjustment of the underwater pelletizing system. Specifically, it adjusts the rotation speed and spacing of the cutters according to the specification requirements of the rubber pellets, improves the size accuracy of the rubber pellets, and meets the needs of different application scenarios.

[0092] S420 is a cooling water recycling system that filters and cools the cooling water used in the cutting process before reuse.

[0093] S430 is the screening and grading of rubber particles. Specifically, before the rubber particles are transported to the drying and packaging system, the particles are screened and graded through screening equipment. The screening equipment must have high-precision screening capabilities to ensure that particles of different sizes are effectively separated.

[0094] Based on the above steps, the underwater pelletizing system includes:

[0095] Cutting module: It is a pelletizer that performs cutting under water. It cuts the rubber strips into pellets through high-speed rotating blades.

[0096] Cooling module: used to quickly cool the cut rubber particles to maintain their shape and performance.

[0097] S500 heats the rubber particles containing water through a drying device, and the dried rubber particles are weighed according to a predetermined weight, and the weighed rubber particles are automatically packaged.

[0098] like Figure 6 As shown, S500 specifically includes the following steps:

[0099] S510 is a drying process that uses automatically controlled drying equipment to monitor the moisture content of rubber particles in real time and automatically adjust drying parameters.

[0100] S520 is a precision weighing machine that uses high-precision weighing equipment to weigh rubber particles.

[0101] S530 is an automatic packaging machine that uses automatic packaging equipment to automatically complete the packaging of weighed rubber particles.

[0102] Based on the above steps, the drying and packaging system includes:

[0103] Drying module: A dryer is used to remove moisture from rubber particles. The drying temperature needs to be precisely controlled to prevent the rubber particles from overheating or uneven drying.

[0104] Weighing module: The weighing module is responsible for weighing the dried rubber particles and uses high-precision weighing equipment to ensure the weighing accuracy of the rubber particles.

[0105] Packing module: Use a packing machine to pack the weighed rubber particles.

[0106] This application includes five key steps. First, according to the production ratio requirements, the rubber powder and the activated oil are mixed by the batching and mixing system; secondly, the mixture is desulfurized and activated at high temperature by a twin-screw desulfurizer; then, the desulfurized and activated mixture is mixed, sheared and extruded with liquid glue and EVA using an auxiliary material mixing system to form a rubber strip; then, the rubber strip is sheared into rubber particles by an underwater pelletizing system, and transported to a drying and packaging system after cooling by a waterway; finally, the rubber particles are dried, weighed and packaged in the drying and packaging system to complete the entire production process. Through precise batching and mixing, high-temperature desulfurization and activation, auxiliary material mixing, underwater pelletizing, and drying and packaging steps, the technology not only improves production efficiency and reduces energy consumption, but also reduces human errors through automated control, and improves product stability and reliability. In addition, the design of the underwater pelletizing and cooling system effectively avoids the adhesion of rubber particles and ensures the molding quality of the particles, while the automated operation of the drying and packaging system further improves the continuity and efficiency of the production process. Overall, the technology realizes the recycling of resources and meets the requirements of sustainable development and environmentally friendly production.

[0107] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0108] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0109] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0110] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features of the present invention.

[0111] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for producing high-performance recycled rubber particles, characterized in that: include: According to the production ratio requirements, the rubber powder and activated oil used in the recycled rubber particles are mixed through the batching and mixing system; After the mixing is completed, the mixture is desulfurized and activated at high temperature by the desulfurization activation system; The auxiliary material mixing system is used to mix, shear and extrude the desulfurized and activated mixture with liquid rubber and EVA to fully blend them, and then extrude the rubber strips; The rubber strips extruded from the auxiliary material mixing system are sheared into rubber particles by the underwater pelletizing system, and the rubber particles are cooled and transported to the drying and packaging system through the water channel; The rubber particles cut underwater are dried by the drying and packaging system and then weighed and packaged.

2. The method for producing high-performance recycled rubber particles according to claim 1, characterized in that: The mixing of ingredients comprises: Prepare the required type and quantity of rubber powder and activation oil; Weighing rubber powder and activation oil according to a predetermined formula ratio, wherein the rubber powder accounts for 70% to 95% of the total weight, and the activation oil accounts for 5% to 30% of the total weight; The weighed raw materials are transported to the mixing tank, and the rubber powder and the activated oil are mixed and stirred using a stirrer.

3. The method for producing high-performance recycled rubber particles according to claim 2, characterized in that: The batching and mixing system comprises: Batching module: equipped with high-energy and high-precision weighing equipment and raw material warehouse or storage tank; Mixing module: includes one or more mixing tanks equipped with a stirrer; Raw material conveying module: pneumatic conveying, screw conveying or belt conveying; Mixing control module: adopt PLC control system.

4. The method for producing high-performance recycled rubber particles according to claim 1, characterized in that: The high temperature desulfurization activation comprises: Preheating of the twin-screw desulfurizer in the desulfurization activation system; In the twin-screw desulfurizer, sulfur is released from the rubber through the action of high temperature and shear force; During the desulfurization process, an appropriate amount of activator is added to the twin-screw desulfurizer, and the activator is between 0.5% and 5% of the total weight of the rubber powder; Monitoring of desulfurization activation process and cooling of materials after desulfurization activation.

5. The method for producing high-performance recycled rubber particles according to claim 4, characterized in that: The desulfurization activation system: Desulfurization module: using twin-screw desulfurizer; Activator adding module: controls the amount and time of adding activator; Control and monitoring module: including temperature monitoring and pressure monitoring.

6. The method for producing high-performance recycled rubber particles according to claim 1, characterized in that: The rubber strip molding comprises: Preheating of the mixer of the auxiliary material mixing system; Input of mixed materials and addition of auxiliary materials; Extrusion of the mixed rubber strip and cooling of the extruded rubber strip.

7. The method for producing high-performance recycled rubber particles according to claim 6, characterized in that: The auxiliary material mixing system comprises: Mixing module: for mixer and auxiliary material adding system; Extrusion module: responsible for extruding the mixed rubber mixture into strips; Mixing control module: including temperature control and pressure control.

8. The method for producing high-performance recycled rubber particles according to claim 1, characterized in that: The processing of the rubber particles comprises: The underwater pelletizing system adjusts the speed and spacing of the cutter to cut the rubber pellets; The cut rubber particles are screened and graded.

9. The method for producing high-performance recycled rubber particles according to claim 8, characterized in that: The underwater pelletizing system comprises Cutting module: a pelletizer for underwater cutting; Cooling module: used to quickly cool the cut rubber particles.

10. The method for producing high-performance recycled rubber particles according to claim 1, characterized in that: The drying and packaging system Drying module: Use a dryer to remove moisture from rubber particles; Weighing module: The weighing module is responsible for weighing the rubber particles after drying; Packing module: Use a packing machine to pack the weighed rubber particles.

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