CN114316612B - Liquid rubber master batch and preparation method and application thereof - Google Patents
Liquid rubber master batch and preparation method and application thereof Download PDFInfo
- Publication number
- CN114316612B CN114316612B CN202111387412.1A CN202111387412A CN114316612B CN 114316612 B CN114316612 B CN 114316612B CN 202111387412 A CN202111387412 A CN 202111387412A CN 114316612 B CN114316612 B CN 114316612B
- Authority
- CN
- China
- Prior art keywords
- stirring
- heating zone
- asphalt
- liquid rubber
- target temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Abstract
The invention provides a liquid rubber master batch and a preparation method and application thereof. The preparation method comprises the following steps: step S1, shearing and vulcanizing waste tire rubber powder by adopting double-screw extrusion equipment to obtain pretreated tire rubber liquid, wherein two screws in the double-screw extrusion equipment rotate in the same direction, and the double screws of the double-screw extrusion equipment are provided with a plurality of sections of heating areas; and S2, mixing the asphalt base material with the pretreated tire glue solution to obtain the liquid rubber master batch. The waste tire rubber powder is used as the raw material, so that the cost can be reduced, waste rubber can be recovered, and the recycling of resources is facilitated; the waste tire rubber powder is sheared and vulcanized, so that the large-scale, continuous and automatic production can be realized, the production efficiency is improved, and the two screws in the double screw extrusion equipment rotate in the same direction during shearing and vulcanization, so that the excessive shearing damage to chain segments of the waste tire rubber powder in the shearing and vulcanization process is ensured, and the obtained pretreated tire rubber solution has larger molecular weight.
Description
Technical Field
The invention relates to the technical field of asphalt, in particular to a liquid rubber master batch and a preparation method and application thereof.
Background
The production of a large number of new tires in China inevitably causes the generation of a large number of junked tires, and the junked tires are important renewable and reusable resources, and meanwhile, due to the characteristic of nondegradable, if the large number of junked tires cannot be effectively regenerated and reused, on one hand, great resource waste can be caused, and meanwhile, the social problems of environmental pollution, land occupation and the like can be brought.
At present, the application of the junked tire rubber powder in road asphalt has a plurality of problems: (1) the technology content is not high, and the added value is low; due to the lack of advanced recycling technology, only low-end utilization can be performed, the added value of recycled products is low, and the great waste of resources is caused; (2) high energy consumption and serious secondary pollution; due to the lack of advanced recycling equipment, large-scale, continuous and automatic production cannot be realized, and the energy consumption and the production efficiency are high; when the waste resources are reused, the effective pollutant control capability and means are lacked, and huge secondary pollution is caused in the production process; (3) lack of large-scale utilization enterprises; the industry is in a small, scattered, messy and poor situation due to the low added value of products, insufficient recycling technical means and other reasons, and large and medium-sized enterprises lack of large scale and saving in the industry to lead the development of the industry.
Disclosure of Invention
The invention mainly aims to provide a liquid rubber master batch and a preparation method and application thereof, so as to solve the problems of high raw material cost and poor stability of rubber asphalt in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a method for preparing a liquid rubber masterbatch, the method comprising: step S1, shearing and vulcanizing waste tire rubber powder by adopting double-screw extrusion equipment to obtain pretreated tire rubber liquid, wherein two screws in the double-screw extrusion equipment rotate in the same direction, and the double screws of the double-screw extrusion equipment are provided with a plurality of sections of heating areas; and S2, mixing the asphalt base material with the pretreated tire glue solution to obtain the liquid rubber master batch.
Further, the multi-section heating zone comprises nine sections of heating zones, wherein the nine sections of heating zones are sequentially a first heating zone, a second heating zone, a third heating zone, a fourth heating zone, a fifth heating zone, a sixth heating zone, a seventh heating zone, an eighth heating zone and a ninth heating zone, the target temperature of the first heating zone is 340-350 ℃, the target temperature of the second heating zone is 350-360 ℃, the target temperature of the third heating zone is 360-370 ℃, the target temperature of the fourth heating zone is 370-380 ℃, the target temperature of the fifth heating zone is 370-380 ℃, the target temperature of the sixth heating zone is 380-370 ℃, the target temperature of the seventh heating zone is 370-360 ℃, the target temperature of the eighth heating zone is 360-350 ℃, and the target temperature of the ninth heating zone is 350-340 ℃.
Further, the length of the fourth heating zone, the fifth heating zone and the sixth heating zone in the multi-section heating zone accounts for 1/4 to 1/2 of the total length of the screws in the double-screw extrusion equipment.
Further, the shearing speed is 60 to 70 rpm, and the feeding speed of the twin-screw extrusion apparatus is preferably 10 to 20 rpm.
Further, the mass ratio of the asphalt base material to the pretreated tire rubber powder is 1:2-2:1.
Further, the particle size of the waste tire rubber powder is 10-20 meshes, and the asphalt base material is preferably any one or more of medium petroleum 70 heavy traffic asphalt, medium petrochemical 70 heavy traffic asphalt, shell 70 and Egypt 70.
Further, before step S1, the preparation method further includes: preheating rubber powder of waste tires; the preheating temperature is preferably 40 to 50 ℃.
According to another aspect of the present invention, there is provided a liquid rubber masterbatch, which is prepared according to the above-described preparation method.
Further, the SBS/liquid rubber composite modified asphalt comprises, by mass: 50-70% of matrix asphalt; 1-15% of SBS; 5-40% of liquid rubber master batch; 0.1 to 10 percent of stabilizer; the liquid rubber masterbatch of claim 7.
Further, the stabilizer is sulfur; the preferred matrix asphalt is any one or more of medium petroleum 70 heavy traffic asphalt, medium petrochemical 70 heavy traffic asphalt, shell 70 and Egypt 70; preferably SBS is selected from any one or more of the trade names T6302H, 791H, 161B.
According to still another aspect of the present invention, there is provided a preparation method of the above SBS/liquid rubber composite modified asphalt, the preparation method comprising: the liquid rubber master batch is prepared by adopting the preparation method; and mixing the matrix asphalt, the SBS, the liquid rubber master batch and the stabilizer serving as materials to be mixed in a stirring device 7 to obtain the SBS/liquid rubber composite modified asphalt.
Further, the stirring device 7 includes: a stirring tank 10, wherein the stirring tank 10 is provided with a containing cavity 11, a feed port 12 communicated with the containing cavity 11, a discharge port 13 communicated with the containing cavity 11 and a avoiding hole 14 communicated with the containing cavity 11; the stirring structure 20 is positioned in the accommodating cavity 11, and the stirring structure 20 can rotate relative to the stirring tank 10 so as to stir the materials to be mixed; the driving mechanism 30 is arranged on the stirring tank 10, and the driving mechanism 30 is positioned outside the accommodating cavity 11; the fixed structure 40 is positioned in the accommodating cavity 11, the fixed structure 40 is fixedly connected with the bottom of the stirring tank 10, the output end of the driving mechanism 30 is in driving connection with one end of the stirring structure 20, and the other end of the stirring structure 20 is in rotating connection with the fixed structure 40.
Further, the stirring structure 20 includes a stirring shaft 21 and a first stirring member 22, the first stirring member 22 is located at the periphery of the stirring shaft 21, one end of the stirring shaft 21 is connected to the output end of the driving mechanism 30, the other end of the stirring shaft 21 is connected to the fixing structure 40, and preferably the first stirring member 22 is a helical blade extending helically around the axis of the stirring shaft 21.
Further, the stirring structure 20 further comprises a second stirring member 23, the second stirring member 23 is connected with the stirring shaft 21 to stir the material to be mixed, the second stirring member 23 is a plurality of, and the plurality of second stirring members 23 are arranged at intervals around the circumference or the axial direction of the stirring shaft 21; alternatively, the second stirring member 23 comprises a first paddle section 231 and a second paddle section 232 connected to the first paddle section 231, the first paddle section 231 and the second paddle section 232 having an angle therebetween, the first paddle section 231 being closer to the bottom of the stirring tank 10 than the second paddle section 232.
By applying the technical scheme of the invention, the preparation method is simple, the cost can be reduced by adopting the waste tire rubber powder as the raw material, and the waste rubber can be recovered, thereby being beneficial to recycling of resources; the double-screw extrusion equipment is adopted to shear and vulcanize the waste tire rubber powder, so that the large-scale, continuous and automatic production can be realized, the production efficiency is improved, and the two screws in the double-screw extrusion equipment rotate in the same direction during the shearing and vulcanization, so that the excessive shearing damage to chain segments of the waste tire rubber powder in the shearing and vulcanization process is further ensured, and the obtained pretreated tire rubber solution has larger molecular weight; after shearing and vulcanizing, the asphalt base material and the pretreated tire glue solution are mixed, so that on one hand, the asphalt base material can be used for cooling the waste tire glue solution, and an anaerobic state is formed to prevent the waste tire glue solution from being oxidized. The liquid rubber master batch has higher compatibility with asphalt, so that the liquid rubber master batch and the asphalt are uniformly mixed. Meanwhile, the liquid rubber master batch in the application keeps the low temperature resistance and ageing resistance of the waste tire rubber powder; can be used for modifying rubber asphalt, thereby improving the stability of the rubber asphalt and the high-temperature storage performance of the modified rubber asphalt.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 shows a schematic structural view of a stirring device according to an embodiment of the present invention;
FIG. 2 shows a top view of another embodiment of a second stirring member of the stirring device of FIG. 1;
fig. 3 shows a schematic structural diagram of a preparation system of SBS/liquid rubber composite modified asphalt according to an embodiment of the present invention.
Wherein the above figures include the following reference numerals:
10. a stirring tank; 11. a receiving chamber; 12. a feed inlet; 13. a discharge port; 14. avoidance holes; 15. a tank body; 16. a top cover; 17. a smoke outlet; 20. a stirring structure; 21. a stirring shaft; 22. a first stirring member; 23. a second stirring member; 231. a first paddle section; 232. a second paddle section; 30. a driving mechanism; 31. a driving motor; 32. a speed reducer; 40. a fixed structure; 50. a coupling; 60. a feed pipe; 70. a discharge pipe; 80. a smoke exhaust pipe;
1. a powder filtering device; 2. a screw conveyor; 3. a storage bin; 4. a feeding device; 5. weighing and feeding device; 6. a twin screw extrusion apparatus; 7. and a stirring device.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
As analyzed in the background art of the present application, the prior art has the problems of high raw material cost and poor stability of rubber asphalt. In order to solve the problems, the application provides a liquid rubber master batch, a preparation method and application thereof.
In an exemplary embodiment of the present application, there is provided a method for preparing a liquid rubber masterbatch, the method comprising: step S1, shearing and vulcanizing waste tire rubber powder by adopting double-screw extrusion equipment to obtain pretreated tire rubber liquid, wherein two screws in the double-screw extrusion equipment rotate in the same direction, and the double screws of the double-screw extrusion equipment are provided with a plurality of sections of heating areas; and S2, mixing the asphalt base material with the pretreated tire glue solution to obtain the liquid rubber master batch.
The preparation method is simple, the cost can be reduced by adopting the waste tire rubber powder as the raw material, and the waste rubber can be recovered, so that the recycling of resources is facilitated; the double-screw extrusion equipment is adopted to shear and vulcanize the waste tire rubber powder, so that the large-scale, continuous and automatic production can be realized, the production efficiency is improved, and the two screws in the double-screw extrusion equipment rotate in the same direction during the shearing and vulcanization, so that the excessive shearing damage to chain segments of the waste tire rubber powder in the shearing and vulcanization process is further ensured, and the obtained pretreated tire rubber solution has larger molecular weight; after shearing and vulcanizing, the asphalt base material and the pretreated tire glue solution are mixed, so that on one hand, the asphalt base material can be used for cooling the waste tire glue solution, and an anaerobic state is formed to prevent the waste tire glue solution from being oxidized. The liquid rubber master batch has higher compatibility with asphalt, so that the liquid rubber master batch and the asphalt are uniformly mixed. Meanwhile, the liquid rubber master batch in the application keeps the low temperature resistance and ageing resistance of the waste tire rubber powder; can be used for modifying rubber asphalt, thereby improving the stability of the rubber asphalt and the high-temperature storage performance of the modified rubber asphalt.
In some embodiments, the multi-stage heating zone includes nine heating zones, where the nine heating zones are sequentially a first heating zone, a second heating zone, a third heating zone, a fourth heating zone, a fifth heating zone, a sixth heating zone, a seventh heating zone, an eighth heating zone, and a ninth heating zone, the first heating zone has a target temperature of 340-350 ℃, the second heating zone has a target temperature of 350-360 ℃, the third heating zone has a target temperature of 360-370 ℃, the fourth heating zone has a target temperature of 370-380 ℃, the fifth heating zone has a target temperature of 370-380 ℃, the sixth heating zone has a target temperature of 380-370 ℃, the seventh heating zone has a target temperature of 370-360 ℃, the eighth heating zone has a target temperature of 360-350 ℃, and the ninth heating zone has a target temperature of 350-340 ℃. The waste tire rubber powder can generate a large amount of harmful waste gas due to overhigh temperature, the waste tire rubber powder reacts at the temperature of 340-380 ℃ to form liquid rubber, and meanwhile, the waste gas emission can be effectively reduced, the national environmental protection requirement is met, the safety production requirement is met, and the fire hazard is eliminated.
In some embodiments, the fourth, fifth and sixth heating zones in the multi-stage heating zones are main reaction zones, and the length of the fourth, fifth and sixth heating zones is controlled to be 1/4 to 1/2, and most preferably one third of the total length of the screws in the twin-screw extrusion device in order to thoroughly perform the reaction.
In order to enhance the dispersion vulcanization of the scrap tire powder, in some embodiments, the shear rate is controlled to be 60 to 70 revolutions per minute, preferably the twin screw extrusion apparatus is fed at a speed of 10 to 20 revolutions per minute.
In some embodiments, the ratio of asphalt binder to pre-treated tire powder is 1:2 to 2:1. The liquid rubber master batch prepared by the asphalt base material and the pretreated tire rubber powder in the range has good chemical stability and high mechanical strength.
In some embodiments, the particle size of the waste tire rubber powder is 10-20 meshes, and the conventional asphalt base materials in the field can be applied to the application, for example, the asphalt base materials are any one or more of medium petroleum 70 heavy traffic asphalt, medium petrochemical 70 heavy traffic asphalt, shell 70 and Egypt 70.
In some embodiments, the method of making further comprises: preheating rubber powder of waste tires; the preheating temperature is preferably 40 to 50 ℃. Improving the efficiency of subsequent shearing vulcanization.
In another exemplary embodiment of the present application, a liquid rubber masterbatch is provided, which is prepared according to the preparation method described above.
The asphalt base material is doped in the preparation process of the liquid rubber master batch, so that the compatibility of the liquid rubber master batch and asphalt is improved; meanwhile, the liquid rubber master batch in the application keeps the low temperature resistance and ageing resistance of the waste tire rubber powder; can be used for modifying rubber asphalt, thereby improving the stability of the rubber asphalt and the high-temperature storage performance of the modified rubber asphalt.
In still another exemplary embodiment of the present application, there is provided an SBS/liquid rubber composite modified asphalt including, in terms of mass content: 50-70% of matrix asphalt; 1-10% of SBS; 5-40% of liquid rubber master batch; 0.1 to 5 percent of stabilizer; preferably 60-67% of matrix asphalt; 4 to 4.3 percent of SBS; 28-35% of liquid rubber master batch; 0.1 to 5 percent of stabilizer; the liquid rubber master batch is the liquid rubber master batch.
According to the asphalt composite modifier, SBS and liquid rubber master batch are adopted to carry out composite modification on asphalt, so that the using amount of SBS can be effectively reduced, and the cost is reduced; the asphalt base material is doped into the liquid rubber master batch in the preparation process, so that the compatibility of the liquid rubber master batch and asphalt is improved; meanwhile, the liquid rubber master batch in the application keeps the low temperature resistance and ageing resistance of the waste tire rubber powder; the SBS has high temperature resistance, the stabilizer can carry out graft crosslinking reaction on the matrix asphalt and the liquid rubber master batch to form a stable netlike system, the SBS, the liquid rubber master batch and the stabilizer can be compounded to modify the rubber asphalt, and the stability of the rubber asphalt and the high temperature storage performance of the modified rubber asphalt can be improved.
Stabilizers, matrix asphalt, SBS, conventional in the art, may be used in the present application, in some embodiments, the stabilizer is sulfur; the preferred matrix asphalt is any one or more of medium petroleum 70 heavy traffic asphalt, medium petrochemical 70 heavy traffic asphalt, shell 70 and Egypt 70; preferably, the SBS is selected from any one or more of SBS with the trade name T6302H, SBS with the trade name 791H and SBS with the trade name 161B. The base asphalt and the asphalt base may be the same or different.
In still another exemplary embodiment of the present application, there is also provided a method for preparing the above SBS/liquid rubber composite modified asphalt, the method comprising: preparing a liquid rubber master batch by adopting any one of the preparation methods; and mixing the matrix asphalt, the SBS, the liquid rubber master batch and the stabilizer serving as materials to be mixed in a stirring device to obtain the SBS/liquid rubber composite modified asphalt.
The prepared liquid rubber master batch and SBS are used for directly carrying out composite modification on asphalt, so that the use level of SBS can be effectively reduced, and the cost is reduced; the asphalt base material is doped into the liquid rubber master batch in the preparation process, so that the compatibility of the liquid rubber master batch and asphalt is improved; meanwhile, the liquid rubber master batch in the application keeps the low temperature resistance and ageing resistance of the waste tire rubber powder; the SBS has high temperature resistance, the stabilizer can carry out graft crosslinking reaction on the matrix asphalt and the liquid rubber master batch to form a stable netlike system, the SBS, the liquid rubber master batch and the stabilizer can be compounded to modify the rubber asphalt, and the stability of the rubber asphalt and the high temperature storage performance of the modified rubber asphalt can be improved.
In some embodiments, as shown in fig. 1, the stirring device includes a stirring tank 10, a stirring structure 20, a driving mechanism 30, and a fixing structure 40, where the stirring tank 10 defines a containing cavity 11, a feed port 12 communicating with the containing cavity 11, a discharge port 13 communicating with the containing cavity 11, and a avoiding hole 14 communicating with the containing cavity 11; the stirring structure 20 is positioned in the accommodating cavity 11, and the stirring structure 20 can rotate relative to the stirring tank 10 so as to stir the materials to be mixed; the driving mechanism 30 is arranged on the stirring tank 10, and the driving mechanism 30 is positioned outside the accommodating cavity 11; the fixed structure 40 is located in the accommodating cavity 11, the fixed structure 40 is fixedly connected with the bottom of the stirring tank 10, the output end of the driving mechanism 30 is in driving connection with one end of the stirring structure 20, and the other end of the stirring structure 20 is in rotating connection with the fixed structure 40.
Through the arrangement, one end of the stirring structure 20 is connected with the output end of the driving mechanism 30, and the other end of the stirring structure 20 is fixedly connected with the bottom of the stirring tank 10 through the fixing structure 40, so that both ends of the stirring structure 20 are supported, and when the stirring structure 20 performs stirring operation, the stirring structure 20 can stably run, and shaking caused by suspension of the bottom of the stirring structure 20 is avoided; meanwhile, as the bottom of the stirring tank 10 can play a certain supporting role on the stirring structure 20, the stirring structure 20 has higher strength, so that the abrasion and damage to the stirring structure 20, which are possibly caused by materials in the stirring process, are avoided, and the stirring device 7 can still keep stable running even in the process of stirring high-viscosity materials or needing high-speed stirring, so that the materials to be mixed have better mixing effect.
The mixing of the viscous and cohesive liquid rubber in the present application by the stirring device 7 can promote the more complete mixing with the asphalt base material. And by utilizing the stirring device 7, the production continuity is improved, the liquid rubber with higher temperature is directly mixed with the asphalt base material to prepare master batch, and the formed master batch can also directly enter the subsequent modification process.
In the above technical solution, the stirring tank 10 is provided with the avoiding hole 14 for connecting the driving mechanism 30 and the stirring structure 20, and the output end of the driving mechanism 30 passes through the avoiding hole 14 and is in driving connection with one end of the stirring structure 20, so as to provide driving force for the stirring structure 20; in addition, in order to facilitate the materials to be stirred to enter the accommodating cavity 11, a feed inlet 12 communicated with the accommodating cavity 11 is formed in the top of the stirring tank 10; in order to facilitate discharging materials, a discharge port 13 is arranged at the bottom of the stirring tank 10, and the discharge port 13 is communicated with a discharge pipe 70 arranged outside the stirring tank 10.
In some embodiments, as shown in fig. 1, the stirring structure 20 includes a stirring shaft 21 and a first stirring member 22, where the first stirring member 22 is located on the outer circumference of the stirring shaft 21, and one end of the stirring shaft 21 is connected to the output end of the driving mechanism 30, and the other end of the stirring shaft 21 is connected to the fixing structure 40. The first stirring member 22 is a helical blade that extends helically around the axis of the stirring shaft 21.
Through the arrangement, the material can be effectively prevented from flowing out of the discharge hole 13 without stirring after entering the accommodating cavity 11 from the feed hole 12, so that the stirring device 7 has better stirring effect; the arrangement in this way also accelerates the flow of material in the receiving chamber 11, while the first stirring element 22 also provides a preliminary stirring of the material.
In some embodiments, as shown in fig. 1, the stirring structure 20 further includes a second stirring member 23, where the second stirring member 23 is connected to the stirring shaft 21 to stir the material to be mixed. The second stirring members 23 are plural, and the plural second stirring members 23 are arranged at intervals around the circumference of the stirring shaft 21; the second stirring member 23 comprises a first paddle section 231 and a second paddle section 232 connected to the first paddle section 231, the first paddle section 231 and the second paddle section 232 having an angle therebetween, the first paddle section 231 being closer to the bottom of the stirring tank 10 than the second paddle section 232.
In the technical scheme, the materials to be mixed can be fully stirred in the transverse direction and the longitudinal direction, and the materials to be mixed can be fully mixed, so that the stirring device 7 has better stirring effect and mixing effect; the retention of the material in the second stirring member 23 can be avoided, so that the stirring device 7 has a better stirring and mixing effect. Preferably, as shown in fig. 1, the second stirring member 23 is "L" -shaped when the angle between the first paddle section 231 and the second paddle section 232 is 90 °. Specifically, the number of the second stirring members 23 is two. Of course, in another embodiment shown in fig. 2, four second stirring members 23 may be provided according to actual needs, and the four second stirring members 23 may be uniformly spaced along the circumferential direction of the stirring shaft.
In some embodiments, the stirring device further includes a coupling 50, where the coupling 50 is located in the accommodating cavity 11, and an output end of the driving mechanism 30 is drivingly connected to one end of the stirring structure 20 through the coupling 50. Through the coupling 50, the stirring structure 20 can rotate synchronously with the output end of the driving mechanism 30, so that the driving force of the driving mechanism 30 is transmitted to the stirring structure 20, and the materials in the accommodating cavity 11 are controllably stirred.
In some embodiments, as shown in fig. 1, the driving mechanism 30 includes a driving motor 31 and a speed reducer 32, an output end of the driving motor 31 is connected to an input end of the speed reducer 32, and an output end of the speed reducer 32 is in driving connection with the stirring structure 20. With the above arrangement, the driving mechanism 30 can transmit the driving force for driving the stirring structure 20 and the driving force for reducing the rotation speed of the stirring structure 20 through the output end, thereby controlling the start-up, stop and deceleration of the stirring device 7.
In some embodiments, as shown in fig. 1, the stirring tank 10 includes a tank body 15 and a top cover 16 connected to the tank body 15, the feed inlet 12 is formed on the top cover 16, the discharge outlet 13 is formed at the bottom of the tank body 15, the top cover 16 is further formed with a smoke outlet 17, and the smoke outlet 17 and the feed inlet 12 are formed on two sides of the avoidance hole 14. In the above technical scheme, the tank body 15 and the top cover 16 enclose the accommodating cavity 11; the feed inlet 12 and the discharge outlet 13 are respectively arranged on the top cover 16 and the bottom of the tank body 15, so that the material entering from the feed inlet 12 can move from the top of the accommodating cavity 11 to the bottom, and the material is fully contacted with the stirring device 7 in the process so as to achieve the optimal stirring effect; in addition, in order to discharge the gas generated during the stirring from the accommodating chamber 11, the top cover 16 is provided with a smoke outlet 17, and the smoke outlet 17 is communicated with a smoke exhaust pipe 80 arranged outside the tank 15; in order to avoid the mutual interference of the feeding and the smoke discharging, the smoke discharging port 17 and the feeding port 12 are respectively arranged at two sides of the avoiding hole 14.
In some embodiments, as shown in fig. 1, the fixing structure 40 is a bearing, an outer ring of the bearing is fixedly connected to the bottom of the stirring tank 10, an inner ring of the bearing is fixedly connected to the stirring shaft 21, and the inner ring is rotatable relative to the outer ring. Through the arrangement, the bearing can be fixedly connected with the rotating stirring shaft 21 and the static stirring tank 10, wherein the outer ring of the bearing is fixedly connected with the bottom of the stirring tank 10 through the bearing base, so that the stirring structure 20 is supported, and the stirring structure 20 is enabled to be more stable in rotation. The present application is described in further detail below in conjunction with specific embodiments, which should not be construed as limiting the scope of the claims.
The process of the following embodiment may take the following steps: as shown in fig. 3, after the waste tire rubber powder is sent into a powder filtering device 1 for filtering, the waste tire rubber powder with small particle size is sent into a storage bin 3 through an inclined screw conveyor 2; secondly, the waste tire rubber powder in the storage bin 3 is further sent into a double-screw extrusion device 6 through a feeding device 4 and a weighing feeding device 5 to carry out the high-temperature shearing desulfurization; the driving mechanism 30 in the stirring device 7 is started, the liquid rubber discharged by the double-screw extrusion equipment 6 is sent into a tank body, and meanwhile, asphalt base materials are added into the tank body for mixing, grinding and homogenizing, so that the liquid rubber master batch is obtained.
The liquid rubber master batch in the tank body is communicated with the feed inlet 12 through the feed pipe 60, so that the stirring and mixing of the two materials in the accommodating cavity 11 are realized.
The preparation system in the technical scheme further comprises a material flowmeter, which is arranged at the joint of the feed inlet 12 and the double-screw extrusion equipment 6 and is used for metering and quantifying the materials entering the feed inlet 12; the liquid level sensor is arranged on the outer wall surface of the tank body 15, is provided with a probe, extends into the accommodating cavity 11 and penetrates through the whole accommodating cavity from the top cover 16 to the bottom of the accommodating cavity 11, and is used for monitoring the liquid level height in the stirring tank 10; a temperature sensor arranged on the inner wall surface of the tank body 15 for measuring the working temperature of the stirring tank; the control system is arranged outside the tank 15 and can control the whole preparation system. Wherein, driving motor, twin-screw extrusion equipment 6, level sensor and temperature sensor all are connected with control system.
Example 1
1) Preheating waste tire rubber powder at 45 ℃, and then shearing and desulfurizing 500 kg of 20-mesh waste tire rubber powder by adopting double-screw extrusion equipment to obtain pretreated tire rubber solution; wherein, two screws in the double-screw extrusion equipment rotate in the same direction, the shearing speed is 60 revolutions per minute, the feeding speed of the double-screw extrusion equipment is 10 revolutions per minute, and the double screws of the double-screw extrusion equipment are provided with nine sections of heating areas with equal length; the target temperature of the first heating zone is 350 ℃, the target temperature of the second heating zone is 360 ℃, the target temperature of the third heating zone is 370 ℃, the target temperature of the fourth heating zone is 380 ℃, the target temperature of the fifth heating zone is 380 ℃, the target temperature of the sixth heating zone is 380 ℃, the target temperature of the seventh heating zone is 370 ℃, the target temperature of the eighth heating zone is 360 ℃, and the target temperature of the ninth heating zone is 350 ℃.
2) Mixing 500 kg of medium petroleum No. 70 heavy asphalt with the liquid rubber mother liquor and the pretreated tire glue solution, and grinding uniformly to obtain the liquid rubber mother liquor.
3) In the stirring device shown in fig. 1, 67% of medium petroleum 70 # heavy traffic asphalt (matrix asphalt) is heated to 180-190 ℃, 4.0% of T6302H (SBS) is uniformly added, stirring is carried out for 30 minutes, 28% of liquid rubber master batch is added, a colloid mill is started for shearing and grinding for 40 minutes, the temperature is kept at 180-190 ℃, 1% of sulfur (stabilizer) is added, and development is carried out for 2 hours, so that SBS/liquid rubber composite modified asphalt is obtained.
Example 2
Unlike example 1, medium petroleum No. 70 heavy traffic asphalt (base asphalt) 55%, T6302H (SBS) 4.3%, liquid rubber masterbatch 40%, sulfur (stabilizer) 0.7% were mixed.
Example 3
Unlike example 1, medium petroleum No. 70 heavy traffic asphalt (base asphalt) 65.9%, T6302H (SBS) 4.2%, liquid rubber masterbatch 29%, sulfur (stabilizer) 0.9% were mixed.
Example 4
Unlike example 1, the shear rate was 70 rpm and the feed rate to the twin screw extrusion apparatus was 20 rpm.
Example 5
Unlike example 1, the shear rate was 90 revolutions per minute.
Example 6
Unlike example 1, the shear rate was 50 revolutions per minute.
Example 7
Unlike example 1, the twin screw extrusion apparatus was fed at a speed of 30 revolutions per minute.
Example 8
Unlike example 1, the feeding speed of the twin-screw extrusion apparatus was 5 revolutions per minute.
Example 9
Unlike example 1, the temperatures of the nine-stage heating zones were set as follows: the target temperature of the first heating zone is 340 ℃, the target temperature of the second heating zone is 350 ℃, the target temperature of the third heating zone is 360 ℃, the target temperature of the fourth heating zone is 370 ℃, the target temperature of the fifth heating zone is 380 ℃, the target temperature of the sixth heating zone is 370 ℃, the target temperature of the seventh heating zone is 360 ℃, the target temperature of the eighth heating zone is 350 ℃, and the target temperature of the ninth heating zone is 340 ℃.
Example 10
Unlike example 1, the temperatures of the nine-stage heating zones were set as follows: the target temperature of the first heating zone is 350 ℃, the target temperatures of the second to eighth heating zones are 380 ℃, and the target temperature of the ninth heating zone is 350 ℃.
Example 11
Unlike example 1, the temperatures of the nine-stage heating zones were set as follows: the target temperature of the first heating zone is 350 ℃, the target temperatures of the second to eighth heating zones are 400 ℃, and the target temperature of the ninth heating zone is 350 ℃.
Example 12
Unlike example 1, 1000 kg of medium petroleum grade 70 heavy traffic asphalt was mixed with the pretreated tire gum solution.
Example 13
Unlike example 1, 250 kg of medium petroleum No. 70 heavy traffic asphalt was mixed with the pretreated tire gum solution.
Example 14
Unlike example 1, 200 kg of medium petroleum No. 70 heavy traffic asphalt was mixed with the pretreated tire gum solution.
Example 15
Unlike example 1, 1200 kg of petroleum grade 70 heavy traffic asphalt was mixed with the pretreated tire gum solution.
Example 16
Unlike example 1, 125 kg of medium petroleum No. 70 heavy traffic asphalt was mixed with the pretreated tire gum solution.
Example 17
Unlike example 1, 1500 kg of petroleum grade 70 heavy traffic asphalt was mixed with the pretreated tire gum solution.
Comparative example 1
94.5% of medium petroleum 70 # heavy traffic asphalt (matrix asphalt), 4.5% of T6302H (SBS) and 1.0% of sulfur (stabilizer) are mixed to obtain SBS modified asphalt.
Comparative example 2
The difference from example 1 is that the two screws in the twin-screw extrusion apparatus are counter-rotated.
Comparative example 3
Unlike example 1, 50% of medium petroleum 70 # heavy traffic asphalt (base asphalt), 4.3% of T6302H (SBS), 45% of liquid rubber masterbatch, and 0.7% of sulfur (stabilizer) were mixed.
Comparative example 4
Unlike example 1, medium petroleum No. 70 heavy traffic asphalt (base asphalt) 75%, T6302H (SBS) 15%, liquid rubber masterbatch 2%, sulfur (stabilizer) 8% were mixed.
TABLE 1
TABLE 2
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: the preparation method is simple, the cost can be reduced by adopting the waste tire rubber powder as the raw material, and the waste rubber can be recovered, so that the recycling of resources is facilitated; the double-screw extrusion equipment is adopted to shear and vulcanize the waste tire rubber powder, so that the large-scale, continuous and automatic production can be realized, the production efficiency is improved, and the two screws in the double-screw extrusion equipment rotate in the same direction during the shearing and vulcanization, so that the excessive shearing damage to chain segments of the waste tire rubber powder in the shearing and vulcanization process is further ensured, and the obtained pretreated tire rubber solution has larger molecular weight; after shearing and vulcanizing, the asphalt base material and the pretreated tire glue solution are mixed, so that on one hand, the asphalt base material can be used for cooling the waste tire glue solution, and an anaerobic state is formed to prevent the waste tire glue solution from being oxidized. The liquid rubber master batch has higher compatibility with asphalt, so that the liquid rubber master batch and the asphalt are uniformly mixed. Meanwhile, the liquid rubber master batch in the application keeps the low temperature resistance and ageing resistance of the waste tire rubber powder; can be used for modifying rubber asphalt, thereby improving the stability of the rubber asphalt and the high-temperature storage performance of the modified rubber asphalt.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A method for preparing a liquid rubber masterbatch, the method comprising:
step S1, shearing and vulcanizing waste tire rubber powder by adopting double-screw extrusion equipment to obtain pretreated tire rubber liquid, wherein two screws in the double-screw extrusion equipment rotate in the same direction, and the double screws of the double-screw extrusion equipment are provided with a plurality of sections of heating areas;
step S2, mixing an asphalt base material with the pretreated tire glue solution to obtain a liquid rubber master batch;
wherein, before step S1, the preparation method further comprises: preheating waste tire rubber powder, wherein the preheating temperature is 40-50 ℃;
the multi-section heating zone comprises nine sections of heating zones, wherein the nine sections of heating zones are sequentially a first heating zone, a second heating zone, a third heating zone, a fourth heating zone, a fifth heating zone, a sixth heating zone, a seventh heating zone, an eighth heating zone and a ninth heating zone, the target temperature of the first heating zone is 340-350 ℃, the target temperature of the second heating zone is 350-360 ℃, the target temperature of the third heating zone is 360-370 ℃, the target temperature of the fourth heating zone is 370-380 ℃, the target temperature of the fifth heating zone is 370-380 ℃, the target temperature of the sixth heating zone is 380-370 ℃, the target temperature of the seventh heating zone is 370-360 ℃, the target temperature of the eighth heating zone is 360-350 ℃, and the target temperature of the ninth heating zone is 350-340 ℃.
2. The preparation method according to claim 1, wherein the length of the fourth heating zone, the fifth heating zone and the sixth heating zone in the multi-section heating zone is 1/4 to 1/2 of the total length of the screws in the twin-screw extrusion equipment.
3. The method according to claim 1, wherein the shearing speed is 60 to 70 rpm, and the feeding speed of the twin-screw extrusion equipment is 10 to 20 rpm.
4. The preparation method of claim 1, wherein the mass ratio of the asphalt base material to the pretreated tire cement is 1:2-2:1.
5. The preparation method of the tire rubber powder according to claim 1, wherein the particle size of the tire rubber powder is 10-20 meshes, and the asphalt base material is any one or more of medium petroleum 70 heavy traffic asphalt, medium petrochemical 70 heavy traffic asphalt, shell 70 and Ecable 70.
6. A liquid rubber masterbatch, characterized in that it is prepared according to the preparation method of any one of claims 1 to 5.
7. An SBS/liquid rubber composite modified asphalt characterized in that the SBS/liquid rubber composite modified asphalt comprises, by mass:
50-70% of matrix asphalt;
SBS 1~15%；
5-40% of a liquid rubber master batch;
0.1-10% of a stabilizer;
the liquid rubber masterbatch according to claim 6.
8. The SBS/liquid rubber composite modified asphalt according to claim 7, wherein the stabilizer is sulfur; the matrix asphalt is any one or more of medium petroleum 70 heavy traffic asphalt, medium petrochemical 70 heavy traffic asphalt, shell 70 and Egypt 70; the SBS is selected from any one or more of the marks T6302H, 791H and 161B.
9. A process for preparing the SBS/liquid rubber composite modified asphalt according to claim 7 or 8, characterized in that the process comprises:
preparing a liquid rubber masterbatch using the preparation method of any one of claims 1 to 5;
and mixing the matrix asphalt, SBS, the liquid rubber master batch and the stabilizer serving as materials to be mixed in a stirring device (7) to obtain the SBS/liquid rubber composite modified asphalt.
10. The preparation method according to claim 9, characterized in that the stirring device (7) comprises:
the stirring tank (10) is used for defining a containing cavity (11), a feed inlet (12) communicated with the containing cavity (11), a discharge outlet (13) communicated with the containing cavity (11) and an avoidance hole (14) communicated with the containing cavity (11);
the stirring structure (20) is positioned in the accommodating cavity (11), and the stirring structure (20) can rotate relative to the stirring tank (10) so as to stir the materials to be mixed;
the driving mechanism (30) is arranged on the stirring tank (10), and the driving mechanism (30) is positioned outside the accommodating cavity (11);
the fixed structure (40) is positioned in the accommodating cavity (11), the fixed structure (40) is fixedly connected with the bottom of the stirring tank (10), the output end of the driving mechanism (30) is in driving connection with one end of the stirring structure (20), and the other end of the stirring structure (20) is in rotating connection with the fixed structure (40).
11. The preparation method according to claim 10, wherein the stirring structure (20) comprises a stirring shaft (21) and a first stirring member (22), the first stirring member (22) is located at the periphery of the stirring shaft (21), one end of the stirring shaft (21) is connected with the output end of the driving mechanism (30), the other end of the stirring shaft (21) is connected with the fixing structure (40), and the first stirring member (22) is a helical blade extending helically around the axis of the stirring shaft (21).
12. The method according to claim 11, wherein the stirring structure (20) further comprises a second stirring member (23), the second stirring member (23) being connected to the stirring shaft (21) to stir the material to be mixed,
the plurality of second stirring members (23) are arranged at intervals around the circumferential direction or the axial direction of the stirring shaft (21); or alternatively, the process may be performed,
the second stirring member (23) comprises a first paddle section (231) and a second paddle section (232) connected with the first paddle section (231), an included angle is formed between the first paddle section (231) and the second paddle section (232), and the first paddle section (231) is closer to the bottom of the stirring tank (10) than the second paddle section (232).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111387412.1A CN114316612B (en) | 2021-11-22 | 2021-11-22 | Liquid rubber master batch and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111387412.1A CN114316612B (en) | 2021-11-22 | 2021-11-22 | Liquid rubber master batch and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114316612A CN114316612A (en) | 2022-04-12 |
| CN114316612B true CN114316612B (en) | 2023-04-21 |
Family
ID=81047653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111387412.1A Active CN114316612B (en) | 2021-11-22 | 2021-11-22 | Liquid rubber master batch and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114316612B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109705365A (en) * | 2018-12-29 | 2019-05-03 | 江苏宝利国际投资股份有限公司 | A kind of preparation method of environment-friendly type composite modified asphalt |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102601975B (en) * | 2012-03-15 | 2014-12-10 | 北京化工大学 | Method for continuously preparing liquid reclaimed rubber by aid of screw extruder |
| CN102977404B (en) * | 2012-10-29 | 2014-11-05 | 北京化工大学 | Method for continuous preparation of reclaimed rubber by using dual-band twin-screw extruder |
| CN102911399B (en) * | 2012-10-29 | 2015-05-20 | 北京化工大学 | Method for regenerating waste rubber by different-screwing-direction double-screw extruder |
| JP6109006B2 (en) * | 2013-08-07 | 2017-04-05 | 住友重機械プロセス機器株式会社 | Stirrer |
| CN104693818A (en) * | 2015-02-12 | 2015-06-10 | 北京路德永泰环保科技有限公司 | Composite-SBS (Styrene Butadiene Styrene block polymer)-particle modified asphalt with storage stability and aging resistance and preparation method thereof |
| CN109228250B (en) * | 2018-07-19 | 2021-01-05 | 南京绿金人橡塑高科有限公司 | Method for preparing rubber-plastic blended microporous infiltrating irrigation pipe by multistage extruder granulation |
| CN208878344U (en) * | 2018-08-07 | 2019-05-21 | 北京必洁仕环保新技术开发有限责任公司 | Liquid agitation tank |
| CN111073323A (en) * | 2019-12-31 | 2020-04-28 | 江苏宝利路面材料技术有限公司 | Preparation method of high-elastic self-repairing odor-free weather-resistant modified asphalt |
| CN111675828B (en) * | 2020-04-10 | 2022-07-26 | 南京绿金人橡塑高科有限公司 | Preparation process of liquid reclaimed rubber |
-
2021
- 2021-11-22 CN CN202111387412.1A patent/CN114316612B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109705365A (en) * | 2018-12-29 | 2019-05-03 | 江苏宝利国际投资股份有限公司 | A kind of preparation method of environment-friendly type composite modified asphalt |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114316612A (en) | 2022-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103773006B (en) | A kind of High Modulus Bituminous Mixtures Additive and preparation method thereof | |
| CN101037577B (en) | Nano chlorobutadiene rubber adhesive and preparation method thereof0} | |
| CN101280114B (en) | SBS modified road asphalt, production method and device thereof | |
| CN101259739A (en) | Technique for producing regenerative rubber by using kneading machinery chemical method and interrelated device thereof | |
| CN102504720A (en) | Cobalt salt adhesive for retreading radial wire cord tire and preparation method thereof | |
| CN101362860A (en) | Crumber rubber modified asphalt and preparation technology thereof | |
| CN104194036B (en) | A kind of regenerative agent of reclaimed rubber and preparation method thereof | |
| CN100410327C (en) | Process for preparing waste-tyre rubber-powder modified pitch, and its host machine | |
| CN114316612B (en) | Liquid rubber master batch and preparation method and application thereof | |
| CN111675828B (en) | Preparation process of liquid reclaimed rubber | |
| CN1683138A (en) | Method and device for powder composition modification | |
| CN206477221U (en) | A kind of regenerating stirrer for pitch concrete | |
| CN201280534Y (en) | SBS modified road pitch production device | |
| CN102020949A (en) | Cobalt salt adhesive for retreading radial steel cord tyres and preparation method thereof | |
| CN201704253U (en) | Production installation for high-viscosity asphalt modifier soluble in asphalt | |
| CN212288245U (en) | Microwave radiation rubber powder continuous production system | |
| CN208667570U (en) | A kind of waste tire rubber recycling desulfurization process device | |
| CN210439103U (en) | Agitating unit is used in pitch regeneration | |
| CN111645217A (en) | Microwave radiation rubber powder continuous production system and method | |
| CN2776654Y (en) | Composite modification device of powder | |
| CN2789255Y (en) | Main machine equipment for producing waste tyre rubber powder modified bitumen | |
| CN112409807A (en) | Rubber asphalt with high storage stability and preparation method thereof | |
| CN201685355U (en) | Spent bleaching clay asphalt modifier producing device | |
| CN201354359Y (en) | Catalytic cracking moving bed reactor with high cost to use abandoned tires | |
| CN109054078A (en) | A kind of waste tire rubber recycling desulfurizing and refining processing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |