CN114316612A - Liquid rubber master batch and preparation method and application thereof - Google Patents
Liquid rubber master batch and preparation method and application thereof Download PDFInfo
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- CN114316612A CN114316612A CN202111387412.1A CN202111387412A CN114316612A CN 114316612 A CN114316612 A CN 114316612A CN 202111387412 A CN202111387412 A CN 202111387412A CN 114316612 A CN114316612 A CN 114316612A
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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 the 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, and the double screws of the double-screw extrusion equipment are provided with a multi-section heating zone; and step S2, mixing the asphalt base material with the pretreated tire rubber solution to obtain the liquid rubber master batch. The waste tire rubber powder is adopted as a raw material, so that the cost can be reduced, and the waste rubber can be recycled, thereby being beneficial to the cyclic utilization of resources; the waste tire rubber powder is cut and vulcanized, so that large-scale, continuous and automatic production can be realized, the production efficiency is improved, two screws in the double-screw extrusion equipment rotate in the same direction during cutting and vulcanizing, the excessive shearing damage to chain segments of the waste tire rubber powder in the cutting and vulcanizing process is further ensured, and the obtained pretreated tire rubber solution has a large molecular weight.
Description
Technical Field
The invention relates to the technical field of asphalt, and particularly relates to a liquid rubber master batch, and a preparation method and application thereof.
Background
The production of a large amount of new tires in China inevitably causes a large amount of waste tires which are important renewable and reusable resources, and simultaneously, because the waste tires have the characteristic of non-degradability, if the large amount of waste tires cannot be effectively regenerated and reused, on one hand, the waste of resources is greatly caused, and meanwhile, the serialized social problems of environmental pollution, land occupation and the like are also caused.
At present, the application of the waste tire rubber powder in the road asphalt has a plurality of problems: (1) the scientific and technological content is not high, and the additional value is low; due to the lack of advanced recycling technology, only low-end utilization can be carried out, the additional value of recycled products is low, and the resource is greatly wasted; (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, the energy consumption is high, and the production efficiency is low; when the waste resources are recycled, the method lacks effective pollutant control capacity and means, and causes huge secondary pollution in the production process; (3) large-scale utilization enterprises are lacked; due to the reasons of low added value of products, insufficient recycling technical means and the like, the industry presents the situation of small, scattered, disordered and poor, and large-scale and energy-saving large and medium-sized enterprises in the industry lack the development of the industry.
Disclosure of Invention
The invention mainly aims to provide a liquid rubber master batch, a preparation method and application thereof, and aims to solve the problems of high raw material cost and poor rubber asphalt stability 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 master batch, the method comprising: step S1, shearing and vulcanizing the 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, and the double screws of the double-screw extrusion equipment are provided with a multi-section heating zone; and step S2, mixing the asphalt base material with the pretreated tire rubber solution to obtain the liquid rubber master batch.
Further, the multi-section heating zone comprises nine heating zones, wherein the nine heating zones sequentially comprise 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 ℃.
Furthermore, the lengths of a fourth heating zone, a fifth heating zone and a sixth heating zone in the multi-section heating zones account for 1/4-1/2 of the total length of a screw in the double-screw extrusion equipment.
Further, the shearing speed is 60-70 r/min, and the feeding speed of the double-screw extrusion equipment is preferably 10-20 r/min.
Further, the mixing 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 preferred asphalt base material is any one or more of medium petroleum No. 70 heavy-duty asphalt, medium petrochemical No. 70 heavy-duty asphalt, Shell No. 70 and Esso No. 70.
Further, before step S1, the preparation method further includes: preheating the waste tire rubber powder; the preheating temperature is preferably 40-50 ℃.
According to another aspect of the present invention, there is provided a liquid rubber masterbatch, which is prepared according to the above preparation method.
Further, the SBS/liquid rubber composite modified asphalt comprises the following components in percentage by mass: 50-70% of matrix asphalt; 1-15% of SBS; 5-40% of liquid rubber master batch; 0.1-10% of a stabilizer; the liquid rubber masterbatch according to claim 7.
Further, the stabilizer is sulfur; preferably, the matrix asphalt is any one or more of medium petroleum No. 70 heavy asphalt, medium petrochemical No. 70 heavy asphalt, Shell No. 70 and Esso No. 70; preferably, SBS is selected from any one or more of the trade designations T6302H, 791H, 161B.
According to another aspect of the present invention, there is provided a method for preparing the SBS/liquid rubber composite modified asphalt, the method comprising: preparing a liquid rubber master batch by adopting the preparation method; mixing the matrix asphalt, SBS, liquid rubber master batch and stabilizer as materials to be mixed in a stirring device 7 to obtain SBS/liquid rubber composite modified asphalt.
Further, the stirring device 7 includes: the stirring tank 10 is characterized in that the stirring tank 10 defines an accommodating cavity 11, a feeding hole 12 communicated with the accommodating cavity 11, a discharging hole 13 communicated with the accommodating cavity 11 and an avoiding hole 14 communicated with the accommodating 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; fixed knot constructs 40, is located holding chamber 11, and fixed knot constructs 40 and agitator tank 10's bottom fixed connection, and actuating mechanism 30's output is connected with the one end drive of stirring structure 20, and the other end and the fixed knot of stirring structure 20 construct 40 and rotate and be connected.
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 with the output end of the driving mechanism 30, the other end of the stirring shaft 21 is connected with the fixed structure 40, and preferably, the first stirring member 22 is a helical blade extending spirally around the axis of the stirring shaft 21.
Further, the stirring structure 20 further includes a plurality of second stirring members 23, the second stirring members 23 are connected to the stirring shaft 21 to stir the materials to be mixed, and the plurality of second stirring members 23 are arranged around the stirring shaft 21 at intervals in the circumferential direction or the axial direction; alternatively, the second stirring member 23 comprises a first paddle section 231 and a second paddle section 232 connected with the first paddle section 231, the first paddle section 231 and the second paddle section 232 have an included angle therebetween, and the first paddle section 231 is 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 a raw material, and the waste rubber can be recycled, thereby being beneficial to the cyclic utilization of resources; the waste tire rubber powder is sheared and vulcanized by adopting the double-screw extrusion equipment, so that large-scale, continuity and automation can be realized, the production efficiency is improved, in addition, the two screws in the double-screw extrusion equipment rotate in the same direction during shearing and vulcanization, 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, mixing the asphalt base stock and the pretreated tire glue solution, on one hand, the asphalt base stock 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 the asphalt, so the two are uniformly mixed in the obtained liquid rubber master batch. Meanwhile, the liquid rubber master batch 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 improving the high-temperature storage performance of the modified rubber asphalt.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is 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 system for preparing SBS/liquid rubber composite modified asphalt according to an embodiment of the present invention.
Wherein the figures include the following reference numerals:
10. a stirring tank; 11. an accommodating cavity; 12. a feed inlet; 13. a discharge port; 14. avoiding 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 drive mechanism; 31. a drive 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. a weighing and feeding device; 6. a twin screw extrusion device; 7. and (4) a stirring device.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As analyzed by the background art of the application, the problems of high raw material cost and poor stability of the rubber asphalt exist in the prior art. In order to solve these problems, the present application provides a liquid rubber masterbatch, a method for preparing the same, and applications thereof.
In one 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 the 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, and the double screws of the double-screw extrusion equipment are provided with a multi-section heating zone; and step S2, mixing the asphalt base material with the pretreated tire rubber 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 a raw material, and the waste rubber can be recycled, so that the recycling of resources is facilitated; the waste tire rubber powder is sheared and vulcanized by adopting the double-screw extrusion equipment, so that large-scale, continuity and automation can be realized, the production efficiency is improved, in addition, the two screws in the double-screw extrusion equipment rotate in the same direction during shearing and vulcanization, 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, mixing the asphalt base stock and the pretreated tire glue solution, on one hand, the asphalt base stock 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 the asphalt, so the two are uniformly mixed in the obtained liquid rubber master batch. Meanwhile, the liquid rubber master batch 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 improving the high-temperature storage performance of the modified rubber asphalt.
In some embodiments, the multi-section heating zone includes nine heating zones, 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 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 ℃. Too high temperature can lead to junked tire rubber powder to produce a large amount of harmful waste gas, and the reaction is carried out under 340 ~ 380 ℃ of this application, can form liquid rubber, can effectively reduce exhaust emission simultaneously, accords with the requirement of national environmental protection, accords with the requirement of safety in production simultaneously, has eliminated the conflagration hidden danger.
In some embodiments, the fourth heating zone, the fifth heating zone and the sixth heating zone in the multi-stage heating zone are main reaction zones, and in order to complete the reaction, the lengths of the fourth heating zone, the fifth heating zone and the sixth heating zone are controlled to be 1/4-1/2, and most preferably one third of the total length of a screw in the twin-screw extrusion device.
In order to improve the dispersion vulcanization effect of the waste tire rubber powder, in some embodiments, the shearing speed is controlled to be 60-70 rpm, and the feeding speed of the twin-screw extrusion equipment is preferably 10-20 rpm.
In some embodiments, the asphalt base stock and the pretreated tire rubber powder are mixed in a ratio of 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.
Considering the problems of cost and energy consumption, in some embodiments, the particle size of the waste tire rubber powder is 10-20 meshes, and conventional asphalt base materials in the field can be applied to the application, for example, the asphalt base material is any one or more of medium petroleum 70 heavy asphalt, medium petrochemical 70 heavy asphalt, shell 70, and esol 70.
In some embodiments, the method of making further comprises: preheating the waste tire rubber powder; the preheating temperature is preferably 40-50 ℃. The efficiency of follow-up shearing vulcanization is improved.
In another exemplary embodiment of the present application, there is provided a liquid rubber masterbatch, which is prepared according to the above preparation method.
The liquid rubber master batch is doped with the asphalt base material in the preparation process, so that the compatibility of the liquid rubber master batch and asphalt is improved; meanwhile, the liquid rubber master batch 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 improving the high-temperature storage performance of the modified rubber asphalt.
In another exemplary embodiment of the present application, there is provided an SBS/liquid rubber composite modified asphalt, which includes, by mass: 50-70% of matrix asphalt; 1-10% of SBS; 5-40% of liquid rubber master batch; 0.1-5% of a stabilizer; preferably 60-67% of matrix asphalt; 4-4.3% of SBS; 28-35% of liquid rubber master batch; 0.1-5% of a stabilizer; the liquid rubber master batch is the liquid rubber master batch.
According to the method, the SBS and the liquid rubber master batch are adopted to carry out composite modification on the asphalt, so that the consumption of the SBS can be effectively reduced, and the cost is reduced; the liquid rubber master batch is doped with the asphalt base material in the preparation process, so that the compatibility of the liquid rubber master batch and asphalt is improved; meanwhile, the liquid rubber master batch keeps the low temperature resistance and ageing resistance of the waste tire rubber powder; the SBS has high temperature resistance, the stabilizer can perform graft crosslinking reaction on the matrix asphalt and the liquid rubber master batch to form a stable net system, and the SBS, the liquid rubber master batch and the stabilizer can be compounded to be used for modifying the rubber asphalt, so that the stability of the rubber asphalt can be improved, and the high-temperature storage performance of the modified rubber asphalt can be improved.
Stabilizers, base asphalt, SBS, which are conventional in the art, may be used herein, and in some embodiments, the stabilizer is sulfur; preferably, the matrix asphalt is any one or more of medium petroleum No. 70 heavy asphalt, medium petrochemical No. 70 heavy asphalt, Shell No. 70 and Esso No. 70; preferably, the SBS is selected from any one or more of SBS number T6302H, SBS number 791H, SBS number 161B. The base asphalt and the asphalt base may be the same or different.
In another exemplary embodiment of the present application, there is also provided a method for preparing the SBS/liquid rubber composite modified asphalt described above, the method including: preparing a liquid rubber master batch by any one of the preparation methods; mixing the matrix asphalt, SBS, liquid rubber master batch and stabilizer serving as materials to be mixed in a stirring device to obtain SBS/liquid rubber composite modified asphalt.
The prepared liquid rubber master batch and SBS are used together to directly carry out compound modification on the asphalt, so that the consumption of SBS can be effectively reduced, and the cost is reduced; the liquid rubber master batch is doped with the asphalt base material in the preparation process, so that the compatibility of the liquid rubber master batch and asphalt is improved; meanwhile, the liquid rubber master batch keeps the low temperature resistance and ageing resistance of the waste tire rubber powder; the SBS has high temperature resistance, the stabilizer can perform graft crosslinking reaction on the matrix asphalt and the liquid rubber master batch to form a stable net system, and the SBS, the liquid rubber master batch and the stabilizer can be compounded to be used for modifying the rubber asphalt, so that the stability of the rubber asphalt can be improved, 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 an accommodating cavity 11, a feeding port 12 communicating with the accommodating cavity 11, a discharging port 13 communicating with the accommodating cavity 11, and an avoidance hole 14 communicating with the accommodating 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 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; fixed knot constructs 40 and is located holding chamber 11, fixed knot constructs 40 and agitator tank 10's bottom fixed connection, and actuating mechanism 30's output is connected with the one end drive of stirring structure 20, and the other end and the fixed knot of stirring structure 20 construct 40 and rotate and be connected.
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, when the stirring structure 20 performs stirring operation, the stirring structure 20 can stably operate, and shaking caused by suspension of the bottom of the stirring structure 20 is avoided; simultaneously, because the bottom of agitator tank 10 can play certain supporting role to stirring structure 20, stirring structure 20 has higher intensity, has avoided wearing and tearing and destruction that the material probably caused stirring structure 20 at stirring in-process to ensure even can also keep even stirring high viscosity material or the in-process agitating unit 7 that needs carry out high-speed stirring to keep even steady operation, make and treat that the mixture has better mixed effect.
Utilize above-mentioned agitating unit 7 to the thick attitude in this application, the liquid rubber that the cohesion is stronger's mixing, can impel it and pitch base material to mix more fully. And the stirring device 7 is utilized to improve the production continuity, so that the liquid rubber with higher temperature is directly mixed with the asphalt base material to prepare the master batch, and the formed master batch can also directly enter the subsequent modification procedure.
In the above technical solution, the agitator tank 10 is provided with the avoidance hole 14 for connecting the driving mechanism 30 and the agitating structure 20, and the output end of the driving mechanism 30 penetrates through the avoidance hole 14 and then is in driving connection with one end of the agitating structure 20, so as to provide a driving force for the agitating structure 20; in addition, in order to facilitate the material to be stirred to enter the accommodating cavity 11, a feeding hole 12 communicated with the accommodating cavity 11 is formed in the top of the stirring tank 10; in order to discharge the materials conveniently, a discharge hole 13 is formed in the bottom of the stirring tank 10, and the discharge hole 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, 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, 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 extending 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 being stirred after entering the accommodating cavity 11 from the feed hole 12, so that the stirring device 7 has a better stirring effect; this arrangement can accelerate the flow of the material in the accommodating chamber 11, and at the same time, the first stirring member 22 can perform preliminary stirring on the material.
As shown in fig. 1, in some embodiments, the stirring structure 20 further includes a second stirring member 23, and the second stirring member 23 is connected to the stirring shaft 21 to stir the materials to be mixed. The second stirring members 23 are multiple, and the multiple second stirring members 23 are arranged at intervals around the circumferential direction of the stirring shaft 21; 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.
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 better stirring and mixing effects. Preferably, as shown in fig. 1, when the included angle between the first paddle section 231 and the second paddle section 232 is 90 °, the second agitating member 23 has an "L" shape. Specifically, the number of the second agitating 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 are uniformly spaced along the circumferential direction of the stirring shaft.
In some embodiments, the stirring device further includes a coupler 50, the coupler 50 is located in the accommodating cavity 11, and the output end of the driving mechanism 30 is in driving connection with one end of the stirring structure 20 through the coupler 50. Through the shaft coupling 50, stirring structure 20 can rotate with actuating mechanism 30's output synchronization to with actuating mechanism 30's drive power transmission to stirring structure 20, the realization is controllable stirs the material in the holding chamber 11.
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 drivingly connected to the stirring structure 20. With the above arrangement, the driving mechanism 30 can transmit a driving force for driving the stirring structure 20 and a driving force for reducing the rotation speed of the stirring structure 20 through the output end, thereby controlling the start, 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 feeding port 12 is formed on the top cover 16, the discharging port 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 feeding port 12 are formed at two sides of the avoidance hole 14. In the above technical solution, the tank body 15 and the top cover 16 enclose an accommodating cavity 11; the feeding hole 12 and the discharging hole 13 are respectively arranged on the top cover 16 and the bottom of the tank body 15, so that the material entering from the feeding hole 12 can move from the top to the bottom of the accommodating cavity 11, and the material is fully contacted with the stirring device 7 in the process, so that the optimal stirring effect is achieved; in addition, in order to discharge the gas generated in the stirring process from the accommodating cavity 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 body 15; in order to avoid the interference between the feeding and the discharging, the 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 with the bottom of the stirring tank 10, an inner ring of the bearing is fixedly connected with the stirring shaft 21, and the inner ring is rotatable relative to the outer ring. Through the setting, the bearing can be with pivoted (mixing) shaft 21 and static agitator tank 10 fixed connection, and wherein, the outer lane of bearing passes through the bottom fixed connection of bearing base with agitator tank 10 to play the supporting role to stirring structure 20, make stirring structure 20 more steady when rotating. The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.
The process of the following example may employ the following steps: as shown in fig. 3, after the waste tire rubber powder is sent to the powder filtering device 1 for powder filtering, the waste tire rubber powder with small particle size is sent to the storage bin 3 through the inclined screw conveyor 2; secondly, the waste tire rubber powder in the storage bin 3 is further fed into a double-screw extrusion device 6 through a feeding device 4 and a weighing feeding device 5 to be subjected to high-temperature shearing desulfurization; and (3) starting a driving mechanism 30 in the stirring device 7, feeding the liquid rubber discharged by the double-screw extrusion equipment 6 into the tank body, and simultaneously adding the asphalt base material into the tank body for mixing, grinding and homogenizing to obtain the liquid rubber master batch.
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 flow meter, wherein the material flow meter is arranged at the joint of the feed port 12 and the double-screw extrusion equipment 6 and is used for metering and quantifying materials entering the feed port 12; the liquid level sensor is arranged on the outer wall surface of the tank body 15, a probe is arranged on the liquid level sensor, the probe extends into the accommodating cavity 11 and penetrates through the entire accommodating cavity from the top cover 16 to the bottom of the accommodating cavity 11, and the liquid level sensor is used for monitoring the liquid level height in the stirring tank 10; the temperature sensor is arranged on the inner wall surface of the tank body 15 and used for measuring the working temperature of the stirring tank; and the control system is arranged outside the tank body 15 and can control the whole preparation system. Wherein, the driving motor, the double-screw extrusion equipment 6, the liquid level sensor and the temperature sensor are all connected with the 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 double screws of the double-screw extrusion equipment are provided with nine sections of heating zones 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) 500 kg of medium petroleum No. 70 heavy traffic asphalt, liquid rubber mother liquor and the pretreated tire rubber solution are mixed and uniformly ground to obtain the liquid rubber master batch.
3) In a stirring device shown in figure 1, 67 percent of medium petroleum No. 70 heavy traffic asphalt (matrix asphalt) is heated to 180-190 ℃, 4.0 percent of T6302H (SBS) is uniformly added, stirring is carried out for 30 minutes, 28 percent of liquid rubber master batch is added, a colloid mill is started to carry out shearing grinding for 40 minutes, the temperature is kept at 180-190 ℃, 1 percent of sulfur (stabilizer) is added, and the development is carried out for 2 hours, so as to obtain the SBS/liquid rubber composite modified asphalt.
Example 2
Different from the example 1, 55% of medium petroleum No. 70 heavy traffic asphalt (base asphalt), 4.3% of T6302H (SBS), 40% of liquid rubber master batch and 0.7% of sulfur (stabilizer) are mixed.
Example 3
Different from the example 1, 65.9% of medium petroleum No. 70 heavy traffic asphalt (base asphalt), 4.2% of T6302H (SBS), 29% of liquid rubber master batch and 0.9% of sulfur (stabilizer) are mixed.
Example 4
In contrast to example 1, the shear rate was 70 rpm and the feed rate of the twin screw extrusion apparatus was 20 rpm.
Example 5
In contrast to example 1, the shear rate was 90 rpm.
Example 6
In contrast to example 1, the shear rate was 50 rpm.
Example 7
In contrast to example 1, the twin-screw extrusion apparatus was fed at a rate of 30 revolutions per minute.
Example 8
In contrast to example 1, the twin-screw extrusion apparatus was fed at a rate of 5 revolutions per minute.
Example 9
In contrast to example 1, the temperature of the nine heating zones was 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
In contrast to example 1, the temperature of the nine heating zones was set as follows: the target temperature of the first heating zone was 350 ℃, the target temperatures of the second heating zone to the eighth heating zone were 380 ℃, and the target temperature of the ninth heating zone was 350 ℃.
Example 11
In contrast to example 1, the temperature of the nine heating zones was set as follows: the target temperature of the first heating zone was 350 ℃, the target temperatures of the second heating zone to the eighth heating zone were 400 ℃, and the target temperature of the ninth heating zone was 350 ℃.
Example 12
In contrast to example 1, 1000 kg of medium petroleum No. 70 heavy traffic asphalt was mixed with the pretreated tire cement.
Example 13
In contrast to example 1, 250 kg of medium petroleum No. 70 heavy traffic asphalt was mixed with the pretreated tire cement.
Example 14
In contrast to example 1, 200 kg of medium petroleum No. 70 heavy traffic asphalt was mixed with the pretreated tire cement.
Example 15
In contrast to example 1, 1200 kg of medium petroleum No. 70 heavy traffic asphalt was mixed with the pretreated tire cement.
Example 16
In contrast to example 1, 125 kg of medium petroleum heavy traffic No. 70 asphalt was mixed with the pretreated tire cement.
Example 17
In contrast to example 1, 1500 kg of medium petroleum No. 70 heavy traffic asphalt was mixed with the pretreated tire cement.
Comparative example 1
94.5 percent of medium petroleum No. 70 heavy traffic asphalt (matrix asphalt), 4.5 percent of T6302H (SBS) and 1.0 percent of sulfur (stabilizer) are mixed to obtain the SBS modified asphalt.
Comparative example 2
The difference from example 1 is that the two screws of the twin-screw extrusion apparatus rotate in opposite directions.
Comparative example 3
Different from the example 1, 50% of medium petroleum No. 70 heavy traffic asphalt (base asphalt), 4.3% of T6302H (SBS), 45% of liquid rubber master batch and 0.7% of sulfur (stabilizer) are mixed.
Comparative example 4
Different from the example 1, 75% of medium petroleum No. 70 heavy traffic asphalt (base asphalt), 15% of T6302H (SBS), 2% of liquid rubber master batch and 8% of sulfur (stabilizer) are mixed.
TABLE 1
TABLE 2
From the above description, it can be seen that the above-described 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 a raw material, and the waste rubber can be recycled, so that the recycling of resources is facilitated; the waste tire rubber powder is sheared and vulcanized by adopting the double-screw extrusion equipment, so that large-scale, continuity and automation can be realized, the production efficiency is improved, in addition, the two screws in the double-screw extrusion equipment rotate in the same direction during shearing and vulcanization, 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, mixing the asphalt base stock and the pretreated tire glue solution, on one hand, the asphalt base stock 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 the asphalt, so the two are uniformly mixed in the obtained liquid rubber master batch. Meanwhile, the liquid rubber master batch 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 improving the high-temperature storage performance of the modified rubber asphalt.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. A method for preparing a liquid rubber masterbatch, characterized in that the method comprises:
step S1, shearing and vulcanizing the waste tire rubber powder by adopting a double-screw extrusion device to obtain a pretreated tire rubber solution, wherein two screws in the double-screw extrusion device rotate in the same direction, and the double screws of the double-screw extrusion device are provided with a multi-section heating zone;
and step S2, mixing the asphalt base material with the pretreated tire rubber solution to obtain the liquid rubber master batch.
2. The preparation method according to claim 1, wherein the multi-stage heating zone comprises nine heating zones, 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 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 ℃.
3. The preparation method of claim 2, wherein the lengths of the fourth heating zone, the fifth heating zone and the sixth heating zone in the multi-stage heating zones account for 1/4-1/2 of the total length of a screw in the twin-screw extrusion device.
4. The method of claim 1, wherein the shearing speed is 60-70 rpm, and the feeding speed of the twin-screw extrusion device is preferably 10-20 rpm.
5. The preparation method of claim 1, wherein the mixing mass ratio of the asphalt base material to the pretreated tire rubber powder is 1: 2-2: 1.
6. The preparation method according to claim 1, wherein the particle size of the waste tire rubber powder is 10-20 meshes, and preferably the asphalt base material is any one or more of medium petroleum No. 70 heavy asphalt, medium petrochemical No. 70 heavy asphalt, Shell No. 70 and Esso No. 70.
7. The method according to claim 1, wherein before step S1, the method further comprises: preheating the waste tire rubber powder; preferably, the preheating temperature is 40-50 ℃.
8. A liquid rubber masterbatch, characterized in that it is produced by the production method according to any one of claims 1 to 7.
9. The SBS/liquid rubber composite modified asphalt is characterized by comprising the following components in percentage by mass:
the liquid rubber masterbatch according to claim 7.
10. The SBS/liquid rubber composite modified asphalt of claim 9, wherein the stabilizer is sulfur; preferably, the matrix asphalt is any one or more of medium petroleum No. 70 heavy asphalt, medium petrochemical No. 70 heavy asphalt, Shell No. 70 and Esso No. 70; preferably, the SBS is selected from any one or more of the trade designations T6302H, 791H, 161B.
11. The method for preparing SBS/liquid rubber composite modified asphalt according to claim 9 or 10, wherein the method for preparing comprises:
preparing a liquid rubber masterbatch by the production method according to any one of claims 1 to 6;
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.
12. The method for preparing according to claim 11, characterized in that said stirring device (7) comprises:
the stirring tank (10) is provided with an accommodating cavity (11), a feeding hole (12) communicated with the accommodating cavity (11), a discharging hole (13) communicated with the accommodating cavity (11) and an avoiding hole (14) communicated with the accommodating cavity (11) in a limiting way;
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);
fixed knot constructs (40), is located in holding chamber (11), fixed knot constructs (40) with the bottom fixed connection of agitator tank (10), the output of actuating mechanism (30) with the one end drive of stirring structure (20) is connected, the other end of stirring structure (20) with fixed knot constructs (40) and rotates the connection.
13. The production method according to claim 12, 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 fixed structure (40), and preferably the first stirring member (22) is a helical blade extending spirally around the axis of the stirring shaft (21).
14. The preparation method according to claim 12, characterized in that the stirring structure (20) further comprises a second stirring member (23), the second stirring member (23) being connected with the stirring shaft (21) to stir the material to be mixed,
the number of the second stirring members (23) is multiple, and the second stirring members (23) are arranged around the circumferential direction or the axial direction of the stirring shaft (21) at intervals; alternatively, the first and second electrodes may be,
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) relative to the second paddle section (232).
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