CN113201226A - Modified asphalt mixed with waste engine oil residues and waste rubber and preparation method thereof - Google Patents
Modified asphalt mixed with waste engine oil residues and waste rubber and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/20—Oxides; Hydroxides
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- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L2201/02—Flame or fire retardant/resistant
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Abstract
The invention discloses modified asphalt mixed with waste engine oil residues and waste rubber and a preparation method thereof, belonging to the technical field of modified asphalt preparation. The invention relates to modified asphalt doped with waste engine oil residues and waste rubber, which is prepared from the following raw materials in parts by mass: 70-90 parts of asphalt, 10-30 parts of waste tire rubber powder, 1-20 parts of waste engine oil residues and 1-10 parts of flame retardant. The modified asphalt is prepared by the steps of softening, high-speed shearing, swelling, adding a flame retardant and the like. The technical scheme of the invention can recycle a large amount of waste engine oil residues, solves the bottleneck problem of restricting the development of the waste engine oil processing industry, greatly saves the processing cost and lightens the environmental and resource pressure.
Description
Technical Field
The invention belongs to the technical field of modified asphalt preparation, and particularly relates to modified asphalt mixed with waste engine oil residues and waste rubber and a preparation method thereof.
Background
By the end of 2019, the traffic mileage of the expressway in China reaches 14.2 kilometers, and the total traffic mileage of the expressway in China reaches more than 480 kilometers. Every year, a large amount of modified asphalt, such as SBS, SBR modified asphalt and the like, is used in road construction, reconstruction and expansion and maintenance projects. On the other hand, with the rapid increase of vehicles such as automobiles, airplanes and the like, 2500 to 3000 million tons of waste engine oil (REO) are generated in China only in the transportation industry every year, 70 to 80 percent of REO can be produced into fuel oil or lubricating oil through processes such as ultrafiltration, centrifugal separation, molecular distillation, flocculation treatment, solvent refining and the like, and the rest 20 to 30 percent of REO becomes real waste engine oil Residues (REOB) because more impurities are mixed and cannot be effectively recovered. The REOB generated in China every year is about 100 ten thousand tons, the harmless treatment cost is huge, and the effective recycling of the REOB becomes a big problem which needs to be overcome urgently in China. Similarly, about 150 million tons of waste rubber materials are generated in China every year, the quantity is increased year by year, and if the waste rubber materials are discarded, not only can great pressure be brought to the environment, but also huge resource waste can be caused.
Disclosure of Invention
The invention provides modified asphalt mixed with waste engine oil residues and waste rubber, which is prepared by mixing the waste engine oil residues and the waste rubber in the asphalt to replace the traditional modifiers such as SBS, SBR and the like, so that the asphalt meeting the ministerial standards is produced, meanwhile, industrial waste residues with strong environmental hazard can be well utilized, the processing cost is greatly saved, and the environmental and resource pressure is reduced.
The technical scheme of the invention is as follows:
modified asphalt doped with waste engine oil residues and waste rubber is prepared from the following raw materials in parts by mass: 70-90 parts of asphalt, 10-30 parts of waste tire rubber powder, 1-20 parts of waste engine oil residues and 1-10 parts of flame retardant.
Preferably, the modified asphalt doped with waste engine oil residues and waste rubber is prepared from the following raw materials in parts by mass: 75-85 parts of asphalt, 15-25 parts of waste tire rubber powder, 5-15 parts of waste engine oil residues and 3-7 parts of flame retardant.
In one technical scheme, the modified asphalt mixed with waste engine oil residues and waste rubber is prepared from the following raw materials in parts by mass: 80 parts of asphalt, 20 parts of waste tire rubber powder, 10 parts of waste engine oil residues and 5 parts of flame retardant.
On the basis of the scheme, the asphalt is common road petroleum asphalt, and preferably, the asphalt is No. 70 road petroleum asphalt.
On the basis of the scheme, the waste tire rubber powder is powder prepared by grinding and desulfurizing the waste rubber tire of the large truck, and the specification is 10-300 meshes.
On the basis of the scheme, the waste engine oil residue is residue generated after the waste engine oil is subjected to ultrafiltration, centrifugal separation, molecular distillation, flocculation treatment and solvent refining; the waste engine oil residues can be classified into waste hydraulic oil residues, waste refrigerator oil residues, waste transformer oil residues and waste lubricating oil residues according to the source of the waste engine oil, and the waste engine oil residues of the types can be used in the invention.
On the basis of the scheme, the flame retardant is one of aluminum hydroxide, magnesium hydroxide, sodium metaborate, ammonium polyphosphate, decabromodiphenylethane and decabromodiphenylether.
The preparation method of the modified asphalt doped with the waste engine oil residues and the waste rubber comprises the following steps:
(1) softening
Heating the waste engine oil residues to 180-190 ℃, adding the waste tire rubber powder according to the mass part, uniformly stirring, and standing for 30min for sufficient softening to form a mixture;
(2) high speed shearing
Heating the asphalt to rapidly raise the temperature to 180-190 ℃, then conveying the mixture and the asphalt in the step (1) to a high-speed shearing pre-mixing system for pre-mixing, wherein the pre-mixing speed is 10-20 r/min, the pre-mixing time is 15-20 min, the pre-mixing temperature is 180-190 ℃, and after pre-mixing, conveying the mixture and the asphalt to a machine for shearing, wherein the shearing speed is 4000-;
(3) swelling of the composition
Conveying the asphalt mixture subjected to high-speed shearing to a swelling reaction system, wherein the stirring speed is 10-20 r/min, the constant temperature is 180 +/-5 ℃, and the pH value of the modified asphalt is detected;
(4) adding a flame retardant
Adding a corresponding flame retardant according to the acidity and alkalinity of the asphalt mixture, adjusting the pH value to 6.8-7.5, and uniformly stirring to form the modified asphalt mixed with the waste engine oil residues and the waste rubber.
On the basis of the scheme, the swelling reaction system is a storage cylinder with stirring and constant temperature functions.
On the basis of the scheme, a flame retardant is quantitatively added according to the target pH value range, and when the pH value of the asphalt mixture is more than 7.5, sodium metaborate or ammonium polyphosphate is added; when the pH value of the asphalt mixture is more than or equal to 6.8 and less than or equal to 7.5, adding decabromodiphenyl ethane or decabromodiphenyl ether; when the pH value of the asphalt mixture is less than 6.8, adding aluminum hydroxide or magnesium hydroxide; and (3) measuring the pH value of the asphalt mixture in real time, and stopping adding the flame retardant when the pH value reaches a target range to obtain the using amount of the flame retardant.
The invention has the beneficial effects that:
(1) the invention can recycle a large amount of waste engine oil residues and is used for paving the asphalt pavement of road engineering, thereby solving the bottleneck problem restricting the development of the waste engine oil processing industry, greatly saving the processing cost and reducing the environmental and resource pressure.
(2) The invention can recycle the waste rubber tires, realize the waste-to-waste processing, and promote the economic and social development.
(3) The rubber powder is infiltrated and softened by using the waste engine oil residues, so that the rubber powder is favorably dispersed, a softener is not needed, the cost is saved, and the high-temperature, low-temperature and fatigue properties of the asphalt can be obviously improved.
(4) The flame retardant has the function of reducing the ignition point of the flammable polymer, also has acidic, alkaline or neutral pH value, and is purposefully added with the acidic, alkaline or neutral flame retardant by utilizing the pH values of different flame retardants according to the pH value of the modified asphalt, so that the stability of metal in REOB can be ensured, the metal is prevented from becoming an ionic state, the flash point and the ignition point of the asphalt are improved, and the construction safety is ensured.
Detailed Description
Terms used in the present invention have generally meanings as commonly understood by one of ordinary skill in the art, unless otherwise specified.
The present invention will be described in further detail with reference to the following data in conjunction with specific examples. The following examples are intended to illustrate the invention and are not intended to limit the scope of the invention in any way.
Example 1
The preparation method of the modified asphalt mixed with the waste engine oil residues and the waste rubber comprises the following steps:
(1) softening
Heating 0.5kg of waste engine oil residues to 180 ℃, adding 1.5kg of waste tire rubber powder into the waste engine oil residues subjected to centrifugal separation and molecular distillation, uniformly stirring the mixture with the specification of 30 meshes, and standing the mixture for 30min for sufficient softening to form a mixture;
(2) high speed shearing
Heating 8.5kg of No. 70 road petroleum asphalt to rapidly raise the temperature to 180 ℃, then conveying the mixture in the step (1) and No. 70 road petroleum asphalt to a high-speed shearing premixing system for premixing, wherein the premixing speed is 10r/min, the premixing time is 15min, the premixing temperature is 180 ℃, and after premixing, conveying the mixture to a machine for shearing, wherein the shearing speed is 4000r/min, the shearing time is 20min, and the shearing temperature is 180 ℃;
(3) swelling of the composition
Conveying the asphalt mixture subjected to high-speed shearing to a swelling reaction system, wherein the system is a storage cylinder with stirring and constant-temperature functions, the stirring speed is 10r/min, the constant temperature is 180 +/-5 ℃, and the pH value of the modified asphalt is 6.4;
(4) adding a flame retardant
Adding 0.3kg of aluminum hydroxide into the swelled asphalt mixture, adjusting the pH value to 7.0, and uniformly stirring; forming the modified asphalt mixed with the waste engine oil residues and the waste rubber.
Example 2
The preparation method of the modified asphalt mixed with the waste engine oil residues and the waste rubber comprises the following steps:
(1) softening
Heating 1.5kg of waste engine oil residues to 190 ℃, adding 2.5kg of waste tire rubber powder into the waste engine oil residues subjected to centrifugal separation and molecular distillation, uniformly stirring the mixture with the specification of 30 meshes, and standing the mixture for 30min for sufficient softening to form a mixture;
(2) high speed shearing
Heating 7.5kg of No. 70 road petroleum asphalt to quickly raise the temperature to 190 ℃, then conveying the mixture in the step (1) and No. 70 road petroleum asphalt to a high-speed shearing premixing system for premixing, wherein the premixing speed is 20r/min, the premixing time is 20min, the premixing temperature is 190 ℃, and after premixing, conveying the mixture into a machine for shearing, wherein the shearing speed is 5000r/min, the shearing time is 30min, and the shearing temperature is 190 ℃;
(3) swelling of the composition
Conveying the asphalt mixture subjected to high-speed shearing to a swelling reaction system, wherein the system is a storage cylinder with stirring and constant-temperature functions, the stirring speed is 20r/min, the constant temperature is 180 +/-5 ℃, and the pH value is 5.7;
(4) adding a flame retardant
Adding 0.7kg of aluminum hydroxide into the swelled asphalt mixture, adjusting the pH value to 7.0, and uniformly stirring; forming the modified asphalt mixed with the waste engine oil residues and the waste rubber.
Example 3
The preparation method of the modified asphalt mixed with the waste engine oil residues and the waste rubber comprises the following steps:
(1) softening
Heating 1.0kg of waste engine oil residues to 185 ℃, adding 2.0kg of waste tire rubber powder into the waste engine oil residues subjected to centrifugal separation and molecular distillation, uniformly stirring the mixture with the specification of 30 meshes, and standing the mixture for 30min for sufficient softening to form a mixture;
(2) high speed shearing
Heating 8.0kg of No. 70 road petroleum asphalt to rapidly raise the temperature to 185 ℃, then conveying the mixture in the step (1) and No. 70 road petroleum asphalt to a high-speed shearing premixing system for premixing, wherein the premixing speed is 15r/min, the premixing time is 20min, the premixing temperature is 185 ℃, and after premixing, conveying the mixture to a machine for shearing, wherein the shearing speed is 4500r/min, the shearing time is 25min, and the shearing temperature is 185 ℃;
(3) swelling of the composition
Conveying the asphalt mixture subjected to high-speed shearing to a swelling reaction system, wherein the system is a storage cylinder with stirring and constant-temperature functions, the stirring speed is 15r/min, the constant temperature is 180 +/-5 ℃, and the pH value is 6.1;
(4) adding a flame retardant
Adding 0.5kg of aluminum hydroxide into the swelled asphalt mixture, adjusting the pH value to 7.0, and uniformly stirring; forming the modified asphalt mixed with the waste engine oil residues and the waste rubber.
Comparative example 1
The preparation method of the modified asphalt mixed with the waste engine oil residues comprises the following steps:
(1) softening
Heating 1.0kg of waste engine oil residues to 185 ℃, wherein the waste engine oil residues are waste lubricating oil residues treated by centrifugal separation and molecular distillation processes;
(2) high speed shearing
Heating 8.0kg of No. 70 road petroleum asphalt to rapidly raise the temperature to 185 ℃, then conveying the waste engine oil residues in the step (1) and No. 70 road petroleum asphalt to a high-speed shearing and premixing system for premixing, wherein the premixing speed is 15r/min, the premixing time is 20min, the premixing temperature is 185 ℃, and the mixture is conveyed to a machine for shearing after being premixed, the shearing speed is 4500r/min, the shearing time is 25min, and the shearing temperature is 185 ℃;
(3) swelling of the composition
Conveying the asphalt mixture subjected to high-speed shearing to a swelling reaction system, wherein the system is a storage cylinder with stirring and constant-temperature functions, the stirring speed is 15r/min, the constant temperature is 180 +/-5 ℃, and the pH value is 5.8;
(4) adding a flame retardant
Adding 0.7kg of aluminum hydroxide into the swelled asphalt mixture, adjusting the pH value to 7.0, and uniformly stirring; forming modified asphalt mixed with waste engine oil residues.
Comparative example 2
The preparation method of the modified asphalt doped with the waste rubber comprises the following steps:
(1) preparing the material
Preparing 2.0kg of waste tire rubber powder with the specification of 30 meshes;
(2) high speed shearing
Heating 8.0kg of No. 70 road petroleum asphalt to rapidly raise the temperature to 185 ℃, then conveying the waste tire rubber powder in the step (1) and the No. 70 road petroleum asphalt to a high-speed shearing and premixing system for premixing, wherein the premixing speed is 15r/min, the premixing time is 20min, the premixing temperature is 185 ℃, and after premixing, conveying the mixture to a machine for shearing, wherein the shearing speed is 4500r/min, the shearing time is 25min, and the shearing temperature is 185 ℃;
(3) swelling of the composition
Conveying the asphalt mixture subjected to high-speed shearing to a swelling reaction system, wherein the system is a storage cylinder with stirring and constant-temperature functions, the stirring speed is 15r/min, the constant temperature is 180 +/-5 ℃, and the pH value is 6.4;
(4) adding a flame retardant
Adding 0.3kg of aluminum hydroxide into the swelled asphalt mixture, adjusting the pH value to 7.0, and uniformly stirring; forming the modified asphalt mixed with the waste rubber.
Comparative example 3
The preparation method of the modified asphalt mixed with the waste engine oil residues and the waste rubber comprises the following steps:
(1) softening
Heating 1.0kg of waste engine oil residues to 160 ℃, adding 2.0kg of waste tire rubber powder into the waste engine oil residues subjected to centrifugal separation and molecular distillation, uniformly stirring the mixture with the specification of 30 meshes, and standing the mixture for 30min for sufficient softening to form a mixture;
(2) high speed shearing
Heating 8.0kg of No. 70 road petroleum asphalt to quickly raise the temperature to 160 ℃, then conveying the mixture in the step (1) and No. 70 road petroleum asphalt to a high-speed shearing premixing system for premixing, wherein the premixing speed is 8r/min, the premixing time is 10min, the premixing temperature is 160 ℃, and after premixing, conveying the mixture into a machine for shearing, wherein the shearing speed is 3000r/min, the shearing time is 15min, and the shearing temperature is 160 ℃;
(3) swelling of the composition
And conveying the asphalt mixture subjected to high-speed shearing to a swelling reaction system, wherein the system is a storage cylinder with stirring and constant temperature functions, the stirring speed is 8r/min, the constant temperature is 180 +/-5 ℃, and the pH value is 6.0, so that the modified asphalt mixed with the waste engine oil residues and the waste rubber is formed.
Comparative example 4
The preparation method of the modified asphalt mixed with the engine oil and the waste rubber comprises the following steps:
(1) softening
Heating 1.0kg of engine oil to 185 ℃, wherein the engine oil is homologous with the waste engine oil residues in the embodiments 1-3 and is the source of the waste engine oil residues, adding 2.0kg of waste tire rubber powder with the specification of 30 meshes, uniformly stirring, and standing for 30min for sufficient softening to form a mixture;
(2) high speed shearing
Heating 8.0kg of No. 70 road petroleum asphalt to rapidly raise the temperature to 185 ℃, then conveying the mixture in the step (1) and No. 70 road petroleum asphalt to a high-speed shearing premixing system for premixing, wherein the premixing speed is 15r/min, the premixing time is 20min, the premixing temperature is 185 ℃, and after premixing, conveying the mixture to a machine for shearing, wherein the shearing speed is 4500r/min, the shearing time is 25min, and the shearing temperature is 185 ℃;
(3) swelling of the composition
Conveying the asphalt mixture subjected to high-speed shearing to a swelling reaction system, wherein the system is a storage cylinder with stirring and constant-temperature functions, the stirring speed is 15r/min, the constant temperature is 180 +/-5 ℃, and the pH value is 6.1;
(4) adding a flame retardant
Adding 0.5kg of aluminum hydroxide into the swelled asphalt mixture, adjusting the pH value to 7.0, and uniformly stirring; forming the modified asphalt mixed with the engine oil and the waste rubber.
The modified asphalt prepared in the examples 1-3 and the comparative examples 1-4 of the invention is subjected to conventional index detection according to the technical Specification for road asphalt pavement construction (JTG F40-2004) and the waste tire rubber powder asphalt for road engineering (JTT 798-2011) issued by the ministry of communications, and the high-temperature performance and the low-temperature performance are simultaneously compared and detected, wherein the test conditions are as follows:
modified asphalt conventional index detection
(1) Testing instrument
The tester comprises a penetrometer (Jinan special fortune apparatus company), a ductility meter (Wuxi city petroleum apparatus equipment company limited), a softening point tester (Beijing Zhongkejian instrument electronic technology company limited), a rotational viscometer (Wuxi city petroleum apparatus equipment company limited), a film heating oven (Shandongdouda highway apparatus company), a Cleveland open cup type flash point tester (Shanghai Changji geological apparatus company limited), and an oven (Shandongdouda highway apparatus company).
(2) Detection method
The detection is carried out according to the test regulation of road engineering asphalt and asphalt mixture of Ministry of transportation JTG E20-2011.
(3) The result of the detection
The conventional index detection results of the modified asphalt are shown in table 1.
TABLE 1
As can be seen from Table 1, the conventional indexes of the modified asphalt blended with the waste engine oil residue and the waste rubber in the examples 1 to 3 all meet the requirements of the technical standards issued by the ministry of China; as can be seen from comparative examples 1 and 2, the indexes of the modified asphalt only mixed with the waste engine oil residues or the waste rubber do not meet the requirements of the technical standards issued by the national ministry; as can be seen from the example 3 and the comparative example 3, the preparation method of the invention can effectively prepare the modified asphalt mixed with the waste engine oil residues and the waste rubber, and the range of each preparation parameter is reasonable and effective; compared with the flash point indexes and the pH values of the examples 1-3 and the comparative example 3, the flash point of the asphalt can be effectively improved by adding the flame retardant, the higher the mixing amount of the flame retardant, the higher the flash point of the asphalt, and when the flame retardant is not added, the flash point of the modified asphalt mixed with the waste engine oil residues and the waste rubber can not meet the technical requirements, and in addition, the pH value of the modified asphalt can be effectively regulated by adding the flame retardant.
Dynamic shear rheology test
(1) Testing instrument
Dynamic shear rheometer (usa), oven (shandongda highway instruments), scraper (commercially available).
(2) Detection method
The test is carried out according to a T0628-2011 test method in road engineering asphalt and asphalt mixture test regulation (JTG E20-2011) of the Ministry of transportation.
(3) The result of the detection
The results are shown in Table 2.
Low temperature bending creep test
(1) Testing instrument
Curved beam rheometer (usa), oven (shandongda highway instruments), cryostat (shandongda highway instruments), scraper (commercially available).
(2) Detection method
The test is carried out according to a T0627-2011 test method in road engineering asphalt and asphalt mixture test regulation (JTG E20-2011) of the Ministry of transportation.
(3) The result of the detection
The results are shown in Table 2.
TABLE 2
From the examples 1-3, it can be known that the high-temperature performance of the asphalt can be obviously enhanced by adding the waste tire rubber powder, the high-temperature performance is improved along with the increase of the mixing amount of the waste tire rubber powder, the low-temperature performance of the asphalt can be improved by adding the waste engine oil residues, and the higher the mixing amount of the waste engine oil residues is, the better the low-temperature performance of the asphalt is; as can be seen from examples 1-3 and comparative examples 1-2, the modified asphalt blended with only the waste engine oil residues has better low-temperature performance, but the high-temperature performance is worse, and the high-temperature performance blended with only the waste tire crumb rubber is better, but the low-temperature performance is deteriorated, and the composite modified asphalt blended with the waste engine oil residues and the waste tire crumb rubber has better high-temperature and low-temperature performance than the modified asphalt blended with any one component; as can be seen from examples 1-3 and comparative example 3, the preparation method of the invention has reasonable setting of each process parameter range, is the best method for preparing the modified asphalt with excellent high-temperature and low-temperature performance, and the performance of the modified asphalt obtained within the process parameter range which is not the method of the invention is inferior to that of the modified asphalt obtained by the method of the invention; comparing examples 1 to 3 with comparative example 4, it can be seen that in the technical scheme of the present invention, the waste engine oil residue plays a role in improving the low temperature performance of the modified asphalt, rather than the engine oil.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (8)
1. The modified asphalt doped with waste engine oil residues and waste rubber is characterized by comprising the following raw materials in parts by mass: 70-90 parts of asphalt, 10-30 parts of waste tire rubber powder, 1-20 parts of waste engine oil residues and 1-10 parts of flame retardant.
2. The modified asphalt mixed with waste engine oil residues and waste rubber as claimed in claim 1, which is characterized by comprising the following raw materials in percentage by mass: 75-85 parts of asphalt, 15-25 parts of waste tire rubber powder, 5-15 parts of waste engine oil residues and 3-7 parts of flame retardant.
3. The modified asphalt mixed with waste engine oil residues and waste rubber as claimed in claim 1, which is characterized by comprising the following raw materials in percentage by mass: 80 parts of asphalt, 20 parts of waste tire rubber powder, 10 parts of waste engine oil residues and 5 parts of flame retardant.
4. The modified asphalt blended with waste engine oil residue and waste rubber according to claim 1, wherein the asphalt is general road petroleum asphalt.
5. The modified asphalt doped with waste engine oil residues and waste rubber as claimed in claim 1, wherein the waste tire rubber powder is powder prepared by grinding and desulfurizing large truck waste rubber tires, and the specification is 10-300 meshes.
6. The modified asphalt blended with waste engine oil residue and waste rubber according to claim 1, wherein the waste engine oil residue is one of waste hydraulic oil residue, waste refrigerator oil residue, waste transformer oil residue, and waste lubricating oil residue.
7. The modified asphalt doped with waste engine oil residues and waste rubber as claimed in claim 1, wherein the flame retardant is one of aluminum hydroxide, magnesium hydroxide, sodium metaborate, ammonium polyphosphate, decabromodiphenylethane and decabromodiphenylether.
8. The method for preparing the modified asphalt blended with the waste engine oil residue and the waste rubber as set forth in any one of claims 1 to 7, comprising the steps of:
(1) softening
Heating the waste engine oil residues to 180-190 ℃, adding the waste tire rubber powder according to the mass part, uniformly stirring, and standing for 30min for sufficient softening to form a mixture;
(2) high speed shearing
Heating the asphalt to rapidly raise the temperature to 180-190 ℃, then conveying the mixture and the asphalt in the step (1) to a high-speed shearing pre-mixing system for pre-mixing, wherein the pre-mixing speed is 10-20 r/min, the pre-mixing time is 15-20 min, the pre-mixing temperature is 180-190 ℃, and after pre-mixing, conveying the mixture and the asphalt to a machine for shearing, wherein the shearing speed is 4000-;
(3) swelling of the composition
Conveying the asphalt mixture subjected to high-speed shearing to a swelling reaction system, wherein the stirring speed is 10-20 r/min, the constant temperature is 180 +/-5 ℃, and the pH value of the modified asphalt is detected;
(4) adding a flame retardant
Adding a corresponding flame retardant according to the acidity and alkalinity of the asphalt mixture, adjusting the pH value to 6.8-7.5, and uniformly stirring to form the modified asphalt mixed with the waste engine oil residues and the waste rubber.
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| CN115160806A (en) * | 2022-07-18 | 2022-10-11 | 甘肃公航旅低碳科技有限公司 | Preparation method and application of low-carbon asphalt based on recycled resources |
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Application publication date: 20210803 |