CN114276693A - Asphalt modifier, preparation method and application - Google Patents
Asphalt modifier, preparation method and application Download PDFInfo
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- CN114276693A CN114276693A CN202111604227.3A CN202111604227A CN114276693A CN 114276693 A CN114276693 A CN 114276693A CN 202111604227 A CN202111604227 A CN 202111604227A CN 114276693 A CN114276693 A CN 114276693A
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Abstract
The invention discloses an asphalt modifier, a preparation method and application. The asphalt comprises the following raw materials in parts by weight: 15-60 parts of thermoplastic elastomer, 10-35 parts of polyurethane elastomer, 15-40 parts of petroleum resin, 5-20 parts of thermosensitive resin, 1-5 parts of stabilizer and 1-10 parts of plasticizer. The invention ensures the high-low temperature service performance of the asphalt modifier, and is beneficial to the rapid melting and dispersion of the asphalt modifier in an asphalt mixing cylinder; the viscosity of the asphalt at the use temperature can be obviously improved, and the pavement performance of the mixture is ensured; the construction viscosity of the asphalt at high temperature can be effectively reduced, the construction workability of the mixture is improved, and the melting dispersion characteristic of the asphalt modifier is further improved; the preparation method is simple and convenient for production and application.
Description
Technical Field
The invention relates to the technical field of asphalt modifiers, and particularly relates to an asphalt modifier, a preparation method and application thereof.
Background
In recent years, drainage road pavement technologies represented by drainage road surfaces and ultrathin overlay surfaces are widely applied, and the open-graded large-gap road surface structure can reduce noise generated in the driving process of vehicles, timely eliminate road surface water films in rainy days, reduce glare phenomena and improve driving safety and comfort. In order to ensure that the drainage mixture has good high-temperature rutting resistance, scattering resistance and durability, the cementing material must adopt high-viscosity asphalt.
In general, a high viscosity asphalt is prepared by adding a polymer modifier, a tackifier, a stabilizer, etc. to a petroleum asphalt to perform a shear development for a long time, but the modifier, the tackifier, etc. are different in density from the asphalt in most cases and have a problem of thermodynamic incompatibility, thereby causing segregation. In addition, the aging and decomposition of the modified asphalt are also caused by long-time high-temperature shearing development. In order to solve the problem that the wet modification cannot overcome, deep research is carried out in Japan, and a dry modification technology represented by TPS additive is developed, namely, the additive is directly put into a mixing cylinder to be rapidly melted and dispersed and is mixed with stone, asphalt and mineral powder to prepare a high-viscosity modified asphalt mixture, so that the manufacturing link of intermediate modified asphalt is omitted, and the problems of segregation and thermal decomposition of the wet modification are effectively avoided.
Most of high-viscosity modifier products in the current market can meet the requirement of the modified asphalt on the dynamic viscosity index at 60 ℃ (more than 50000Pas) and even reach more than 200000Pas, but the high-viscosity modifier products face two prominent problems in the mixing and construction processes of asphalt mixtures: firstly, the high-viscosity modifier has poor melting dispersibility, and cannot be quickly melted and uniformly dispersed in a mixing cylinder for a short mixing time of tens of seconds; secondly, the viscosity of the high-viscosity modifier and asphalt after being mixed at high temperature is too high, so that the construction workability is poor, and the compaction of the mixture is difficult. However, a solution capable of simultaneously solving the above two problems has not been reported at present.
Disclosure of Invention
The embodiment of the invention provides an asphalt modifier, a preparation method and application, and aims to solve the problem that the prior art cannot meet the requirements of high-temperature viscosity and low-temperature viscosity at the same time.
In a first aspect, an asphalt modifier is provided, which comprises the following raw materials in parts by weight: 15-60 parts of thermoplastic elastomer, 10-35 parts of polyurethane elastomer, 15-40 parts of petroleum resin, 5-20 parts of thermosensitive resin, 1-5 parts of stabilizer and 1-10 parts of plasticizer.
In a second aspect, a method for preparing an asphalt modifier is provided, which comprises the following steps:
uniformly mixing the raw materials to obtain a first mixture, wherein the raw materials comprise the following raw materials in parts by weight: 15-60 parts of thermoplastic elastomer, 10-35 parts of polyurethane elastomer, 15-40 parts of petroleum resin, 5-20 parts of thermosensitive resin, 1-5 parts of stabilizer and 1-10 parts of plasticizer;
and melting and mixing the first mixture, extruding, cooling and drying to obtain the asphalt modifier.
In a third aspect, there is provided a use of the asphalt modifier according to the embodiment of the first aspect in asphalt mixture.
Therefore, the embodiment of the invention ensures the high-low temperature service performance of the asphalt modifier, and is beneficial to the rapid melting and dispersion of the asphalt modifier in the asphalt mixing cylinder; the viscosity of the asphalt at the use temperature can be obviously improved, and the pavement performance of the mixture is ensured; the construction viscosity of the asphalt at high temperature can be effectively reduced, the construction workability of the mixture is improved, and the melting dispersion characteristic of the asphalt modifier is further improved; the preparation method is simple and convenient for production and application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a flow chart of a method of preparing an asphalt modifier according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses an asphalt modifier. The asphalt modifier comprises the following raw materials in parts by weight: 15-60 parts of thermoplastic elastomer, 10-35 parts of polyurethane elastomer, 15-40 parts of petroleum resin, 5-20 parts of thermosensitive resin, 1-5 parts of stabilizer and 1-10 parts of plasticizer.
Preferably, the thermoplastic elastomer is present in an amount of 15, 20, 40, or 60 parts by weight, or any two of the amounts 15, 20, 40, or 60 are upper and lower limits. The weight portion of the polyurethane elastomer is 10, 20 or 35, or any two values of 15, 20 and 35 are taken as the upper and lower limits. The weight portion of the petroleum resin is 15, 20 or 40, or the range taking any two of the values of 15, 20 and 40 as upper and lower limits. The weight portion of the heat-sensitive resin is 5, 10, 12 or 20, or any two values of 5, 10, 12 or 20 are taken as the upper and lower limits. The weight portion of the stabilizer is 1, 2 or 5, or the range taking any two values of 1, 2 and 5 as upper and lower limits. The weight portion of the plasticizer is 1, 3, 5, 8 or 10, or the range taking any two values of 1, 3, 5, 8 and 10 as upper and lower limits.
Preferably, the weight ratio of the polyurethane elastomer to the petroleum resin is 1: 1-1: 1.5.
Preferably, the weight ratio of the polyurethane elastomer to the heat-sensitive resin is 7: 1.
Wherein the thermoplastic elastomeric polymer comprises at least one of: styrene-butadiene-styrene triblock copolymers (SBS), styrene-isoprene-styrene triblock copolymers (SIS), styrene-ethylene butylene copolymer-styrene triblock copolymers (SEBS) and thermoplastic polyolefin elastomers (TP 0). The molecular weight of the thermoplastic elastomer polymer is 5-30 ten thousand. When the molecular weight of the thermoplastic elastomer polymer is less than 5 ten thousand, the performance cannot meet the specification requirements; when the molecular weight of the thermoplastic elastomeric polymer is higher than 30 ten thousand, the blend cannot be processed by extruder molding. The melt index is more than 8g/10min, and the melt dispersibility of the modifier can be improved.
The polyurethane elastomer is polyester type thermoplastic polyurethane (polyester type TPU), and the molecular weight is 60000-100000. The polyester type thermoplastic polyurethane can further improve the strength and toughness of the matrix material and can improve the temperature sensitivity of the modifier to a certain extent.
The modified petroleum resin comprises at least one of the following: modified carbon five resins, modified carbon nine resins, and modified terpene resins. The softening point is 80-150 ℃. The modification method is to graft maleic anhydride on the basis of the crude petroleum resin or to modify by adopting phenol and the like. The modified petroleum resin can improve the molecular cohesion, heat resistance and aging resistance of the blend, and has better compatibility with other resins and thermoplastic elastomers.
The heat-sensitive resin includes at least one of: polyacrylonitrile resin and polyvinyl chloride resin.
The stabilizer includes at least one of the following: sulfur, calcium-zinc composite stabilizer and methyl tin stabilizer.
The plasticizer includes at least one of: dioctyl phthalate, naphthenic rubber oil, furfural extract oil, coumarone resin and stearic acid. Wherein the aromatic hydrocarbon content of the naphthenic base rubber oil and the furfural extract oil is more than 85 percent.
Through the raw materials, the thermoplastic elastomer polymer and the polyurethane elastomer play a role in strengthening and toughening in the whole modifier, the high-low temperature service performance of the modifier is ensured, the molecular weight is moderate, the melt index is high, and the rapid melting and dispersion of the modifier in an asphalt mixing cylinder are facilitated; the modified petroleum resin contains strong polar groups, and the viscosity of the asphalt at the use temperature can be obviously improved by matching with polyurethane elastomer, so that the pavement performance of the mixture is ensured; the heat-sensitive resin has extremely strong sensitivity to temperature, and can effectively reduce the construction viscosity of asphalt at high temperature and improve the construction workability of the mixture when being matched with the polyurethane elastomer; in addition, the reduction in high temperature viscosity can further improve the melt dispersion characteristics of the modifier.
The embodiment of the invention also discloses a preparation method of the asphalt modifier. Specifically, as shown in fig. 1, the preparation method comprises the following steps:
step S1: the raw materials are uniformly mixed to obtain a first mixture.
The raw materials are in the weight parts described in the above examples, and are not described herein again. The mixing can be carried out in a high-speed mixer. The mixing temperature is 50-100 ℃.
Step S2: and melting and mixing the first mixture, extruding, cooling and drying to obtain the asphalt modifier.
And carrying out melt mixing and extrusion by using a double-screw extruder. The cylinder temperature of the double-screw extruder is 150-220 ℃, and the screw rotating speed of the double-screw extruder is 100-500 r/min.
The embodiment of the invention also discloses an application of the asphalt modifier in asphalt mixture. Specifically, the asphalt modifier can be used for preparing high-viscosity modified asphalt and also can be used for preparing high-viscosity asphalt mixture.
The technical solution of the present invention is further illustrated by the following specific examples.
Example 1
The asphalt modifier comprises the following raw materials: 60 parts of styrene-butadiene-styrene triblock copolymer (the styrene content is 30 percent, and the melt index is 12g/10min), 10 parts of thermoplastic polyurethane, 15 parts of modified carbon-five petroleum resin, 12 parts of polyvinyl chloride resin, 2 parts of calcium-zinc composite stabilizer and 1 part of dioctyl phthalate.
The method for preparing the asphalt modifier from the raw materials comprises the following steps: the raw materials are weighed according to the proportion and then added into a high-speed mixer, stirred at a high speed of 50 ℃ for 10min, and then sent into a double-screw extruder for extrusion granulation, wherein the barrel temperature is 180 ℃, and the screw rotating speed is 150r/min, so that the asphalt modifier 1 #.
The method for preparing the high-viscosity modified asphalt by using the asphalt modifier comprises the following steps: heating the matrix asphalt to 160 ℃, then adding a proper amount of the asphalt modifier (the mass ratio of the asphalt modifier to the matrix asphalt is 12:88), stirring uniformly, gradually heating to 180 +/-10 ℃, then shearing for 20min at the temperature by adopting a high-speed shearing machine at the shearing speed of 4500r/min, and finally placing the sheared mixture in an oven at the temperature of 180 ℃ for heat preservation for 20min to prepare the high-viscosity modified asphalt.
The method for preparing the high-viscosity asphalt mixture by using the asphalt modifier comprises the following steps: heating the matrix asphalt to 160-165 ℃, preparing coarse and fine aggregates according to the gradation shown in table 1, and then placing the coarse and fine aggregates in an oven at 180-190 ℃ for heat preservation for 5 hours. And (3) starting a mixing pot, dry-mixing the asphalt modifier and the hot aggregate for 60s to uniformly disperse the sample in the mineral aggregate, then adding the matrix asphalt and mixing for 90s, and finally adding the mineral powder and mixing for 90s to obtain the high-viscosity asphalt mixture.
Table 1 drainage pavement asphalt mixture test gradation
| Mesh size/mm | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Through rate/%) | 100 | 93.5 | 60.0 | 19.5 | 14.6 | 12.3 | 9.5 | 8.6 | 6.0 | 5.2 |
Example 2
The asphalt modifier comprises the following raw materials: 40 parts of styrene-ethylene butylene copolymer-styrene triblock copolymer (the styrene content is 29 percent, and the melt index is 10g/10min), 20 parts of thermoplastic polyurethane, 20 parts of modified terpene resin, 10 parts of polyacrylonitrile resin, 2 parts of sulfur and 8 parts of naphthenic base rubber oil (the aromatic hydrocarbon content is 89 percent).
The method for preparing the asphalt modifier from the raw materials comprises the following steps: the raw materials are weighed according to the proportion and then added into a high-speed mixer, stirred at a high speed of 50 ℃ for 10min, and then sent into a double-screw extruder for extrusion granulation, wherein the barrel temperature is 180 ℃, and the screw rotating speed is 150r/min, so that the asphalt modifier 2# is obtained.
The method for preparing the high-viscosity modified asphalt by using the asphalt modifier comprises the following steps: heating the matrix asphalt to 160 ℃, then adding a proper amount of the asphalt modifier (the mass ratio of the asphalt modifier to the matrix asphalt is 12:88), stirring uniformly, gradually heating to 180 +/-10 ℃, then shearing for 20min at the temperature by adopting a high-speed shearing machine at the shearing speed of 4500r/min, and finally placing the sheared mixture in an oven at the temperature of 180 ℃ for heat preservation for 20min to prepare the high-viscosity modified asphalt.
The method for preparing the high-viscosity asphalt mixture by using the asphalt modifier comprises the following steps: heating the matrix asphalt to 160-165 ℃, preparing coarse and fine aggregates according to the gradation shown in table 1, and then placing the coarse and fine aggregates in an oven at 180-190 ℃ for heat preservation for 5 hours. And (3) starting a mixing pot, dry-mixing the asphalt modifier and the hot aggregate for 60s to uniformly disperse the sample in the mineral aggregate, then adding the matrix asphalt and mixing for 90s, and finally adding the mineral powder and mixing for 90s to obtain the high-viscosity asphalt mixture.
Example 3
The asphalt modifier comprises the following raw materials: 40 parts of styrene-ethylene butylene copolymer-styrene triblock copolymer (the styrene content is 30 percent, and the melt index is 22g/10min), 10 parts of thermoplastic polyurethane, 15 parts of modified carbon nine resin, 20 parts of polyvinyl chloride resin, 5 parts of methyl tin stabilizer and 10 parts of coumarone resin.
The method for preparing the asphalt modifier from the raw materials comprises the following steps: the raw materials are weighed according to the proportion and then added into a high-speed mixer, stirred at a high speed of 100 ℃ for 10min, and then sent into a double-screw extruder for extrusion granulation, wherein the barrel temperature is 200 ℃, and the screw rotating speed is 180r/min, so that the asphalt modifier 3# is obtained.
The method for preparing the high-viscosity modified asphalt by using the asphalt modifier comprises the following steps: heating the matrix asphalt to 160 ℃, then adding a proper amount of the asphalt modifier (the mass ratio of the asphalt modifier to the matrix asphalt is 12:88), stirring uniformly, gradually heating to 180 +/-10 ℃, then shearing for 20min at the temperature by adopting a high-speed shearing machine at the shearing speed of 4500r/min, and finally placing the sheared mixture in an oven at the temperature of 180 ℃ for heat preservation for 20min to prepare the high-viscosity modified asphalt.
The method for preparing the high-viscosity asphalt mixture by using the asphalt modifier comprises the following steps: heating the matrix asphalt to 160-165 ℃, preparing coarse and fine aggregates according to the gradation shown in table 1, and then placing the coarse and fine aggregates in an oven at 180-190 ℃ for heat preservation for 5 hours. And (3) starting a mixing pot, dry-mixing the asphalt modifier and the hot aggregate for 60s to uniformly disperse the sample in the mineral aggregate, then adding the matrix asphalt and mixing for 90s, and finally adding the mineral powder and mixing for 90s to obtain the high-viscosity asphalt mixture.
Example 4
The asphalt modifier comprises the following raw materials: 20 parts of styrene-ethylene butylene copolymer-styrene triblock copolymer (the styrene content is 30 percent, and the melt index is 22g/10min), 35 parts of thermoplastic polyurethane, 40 parts of modified terpene resin, 5 parts of polyacrylonitrile resin, 2 parts of methyl tin stabilizer and 3 parts of furfural extract oil (the aromatic hydrocarbon content is 92 percent).
The method for preparing the asphalt modifier from the raw materials comprises the following steps: the components are weighed according to the proportion and then added into a high-speed mixer, stirred at a high speed of 80 ℃ for 10min, and then sent into a double-screw extruder for extrusion and granulation, wherein the temperature of a machine barrel is 200 ℃, and the rotating speed of a screw is 180r/min, so that the asphalt modifier No. 4 is obtained.
The method for preparing the high-viscosity modified asphalt by using the asphalt modifier comprises the following steps: heating the matrix asphalt to 160 ℃, then adding a proper amount of the asphalt modifier (the mass ratio of the asphalt modifier to the matrix asphalt is 12:88), stirring uniformly, gradually heating to 180 +/-10 ℃, then shearing for 20min at the temperature by adopting a high-speed shearing machine at the shearing speed of 4500r/min, and finally placing the sheared mixture in an oven at the temperature of 180 ℃ for heat preservation for 20min to prepare the high-viscosity modified asphalt.
The method for preparing the high-viscosity asphalt mixture by using the asphalt modifier comprises the following steps: heating the matrix asphalt to 160-165 ℃, preparing coarse and fine aggregates according to the gradation shown in table 1, and then placing the coarse and fine aggregates in an oven at 180-190 ℃ for heat preservation for 5 hours. And (3) starting a mixing pot, dry-mixing the asphalt modifier and the hot aggregate for 60s to uniformly disperse the sample in the mineral aggregate, then adding the matrix asphalt and mixing for 90s, and finally adding the mineral powder and mixing for 90s to obtain the high-viscosity asphalt mixture.
Example 5
The asphalt modifier comprises the following raw materials: 15 parts of styrene-ethylene butylene copolymer-styrene triblock copolymer (the styrene content is 30 percent, and the melt index is 20g/10min), 35 parts of thermoplastic polyurethane, 40 parts of modified carbon nine resin, 5 parts of polyacrylonitrile resin, 2 parts of methyl tin stabilizer and 3 parts of naphthenic rubber oil (the aromatic hydrocarbon content is 89 percent).
The method for preparing the asphalt modifier from the raw materials comprises the following steps: the components are weighed according to the proportion and then added into a high-speed mixer, stirred at a high speed of 80 ℃ for 10min, and then sent into a double-screw extruder for extrusion and granulation, wherein the barrel temperature is 220 ℃, and the screw rotating speed is 200r/min, so that the asphalt modifier No. 5 is obtained.
The method for preparing the high-viscosity modified asphalt by using the asphalt modifier comprises the following steps: heating the matrix asphalt to 160 ℃, then adding a proper amount of the asphalt modifier (the mass ratio of the asphalt modifier to the matrix asphalt is 12:88), stirring uniformly, gradually heating to 180 +/-10 ℃, then shearing for 20min at the temperature by adopting a high-speed shearing machine at the shearing speed of 4500r/min, and finally placing the sheared mixture in an oven at the temperature of 180 ℃ for heat preservation for 20min to prepare the high-viscosity modified asphalt.
The method for preparing the high-viscosity asphalt mixture by using the asphalt modifier comprises the following steps: heating the matrix asphalt to 160-165 ℃, preparing coarse and fine aggregates according to the gradation shown in table 1, and then placing the coarse and fine aggregates in an oven at 180-190 ℃ for heat preservation for 5 hours. And (3) starting a mixing pot, dry-mixing the asphalt modifier and the hot aggregate for 60s to uniformly disperse the sample in the mineral aggregate, then adding the matrix asphalt and mixing for 90s, and finally adding the mineral powder and mixing for 90s to obtain the high-viscosity asphalt mixture.
Example 6
The asphalt modifier comprises the following raw materials: 40 parts of thermoplastic polyolefin elastomer, 35 parts of thermoplastic polyurethane, 15 parts of modified terpene resin, 5 parts of polyacrylonitrile resin, 1 part of calcium-zinc composite stabilizer and 5 parts of dioctyl phthalate.
The method for preparing the asphalt modifier from the raw materials comprises the following steps: the components are weighed according to the proportion and then added into a high-speed mixer, stirred at a high speed of 80 ℃ for 10min, and then sent into a double-screw extruder for extrusion and granulation, wherein the barrel temperature is 200 ℃, and the screw rotating speed is 180r/min, so that the asphalt modifier No. 6 is obtained.
The method for preparing the high-viscosity modified asphalt by using the asphalt modifier comprises the following steps: heating the matrix asphalt to 160 ℃, then adding a proper amount of the asphalt modifier (the mass ratio of the asphalt modifier to the matrix asphalt is 12:88), stirring uniformly, gradually heating to 180 +/-10 ℃, then shearing for 20min at the temperature by adopting a high-speed shearing machine at the shearing speed of 4500r/min, and finally placing the sheared mixture in an oven at the temperature of 180 ℃ for heat preservation for 20min to prepare the high-viscosity modified asphalt.
The method for preparing the high-viscosity asphalt mixture by using the asphalt modifier comprises the following steps: heating the matrix asphalt to 160-165 ℃, preparing coarse and fine aggregates according to the gradation shown in table 1, and then placing the coarse and fine aggregates in an oven at 180-190 ℃ for heat preservation for 5 hours. And (3) starting a mixing pot, dry-mixing the asphalt modifier and the hot aggregate for 60s to uniformly disperse the sample in the mineral aggregate, then adding the matrix asphalt and mixing for 90s, and finally adding the mineral powder and mixing for 90s to obtain the high-viscosity asphalt mixture.
According to the test method in road engineering asphalt and asphalt mixture test procedure (JTG E20-2011), the modified asphalt and the asphalt mixture prepared by the asphalt modifier in examples 1-6 are respectively subjected to related performance tests, and the test results are shown in table 2.
TABLE 2 Properties of high-tack modified asphalt and high-tack asphalt mixture
From the performance test results of table 2, it can be seen that:
(1) the core index pavement performance of the high-viscosity modified asphalt and the high-viscosity asphalt mixture prepared by the high-viscosity modifier in the embodiment 1# to 6# is far higher than the technical requirement of the standard specification, the dynamic viscosity of the high-viscosity modified asphalt at 60 ℃ is all greater than 200000 Pa.s, and the bonding performance of the macroporous mixture at the actual use temperature is ensured; the brookfield viscosity at 170 ℃ is less than 3 Pa.s, and the construction workability requirement of the macroporous mixture is met. The road performance of the high-viscosity asphalt mixture is also very excellent, and the high-viscosity asphalt mixture has wide application prospect.
(2) The results of the 1# to 3# examples show that when the ratio of the thermoplastic polyurethane to the petroleum resin is in the range of 1:1 to 1:1.5, the modifier shows more excellent low-temperature viscosity due to the synergistic effect of the polar groups in the thermoplastic polyurethane and the petroleum resin, so that the dynamic viscosity at 60 ℃ of the high-viscosity modified asphalt is greatly increased, and the road performance of the mixture is improved.
(3) The results of examples # 4 to # 6 show that when the ratio of the thermoplastic polyurethane to the heat-sensitive resin is 7:1, the modifier shows more excellent high-temperature viscosity due to the synergistic effect of the thermoplastic polyurethane and the heat-sensitive resin, resulting in a great reduction in the dynamic viscosity at 170 ℃ of the high-viscosity modified asphalt.
(4) It can be seen from the above embodiment that the low temperature viscosity and the high temperature viscosity cannot be simultaneously optimized, and therefore, the selection of the amounts of the thermoplastic polyurethane, the petroleum resin and the heat-sensitive resin, which mainly affect the two viscosities, is crucial, and the low temperature viscosity and the high temperature viscosity can meet the requirements only if the amounts of the three are reasonable. Under the condition of definite using amount of thermoplastic polyurethane and petroleum resin, better high-temperature viscosity is ensured, and the low-temperature viscosity can be improved by adding the heat-sensitive resin; under the condition of definite using amount of the thermoplastic polyurethane and the thermosensitive resin, better low-temperature viscosity is ensured, and the high-temperature viscosity can be improved by reducing the using amount of the petroleum resin.
In conclusion, the embodiment of the invention ensures the high-low temperature service performance of the asphalt modifier, and is beneficial to the rapid melting and dispersion of the asphalt modifier in the asphalt mixing cylinder; the viscosity of the asphalt at the use temperature can be obviously improved, and the pavement performance of the mixture is ensured; the construction viscosity of the asphalt at high temperature can be effectively reduced, the construction workability of the mixture is improved, and the melting dispersion characteristic of the asphalt modifier is further improved; the preparation method is simple and convenient for production and application.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The asphalt modifier is characterized by comprising the following raw materials in parts by weight: 15-60 parts of thermoplastic elastomer, 10-35 parts of polyurethane elastomer, 15-40 parts of petroleum resin, 5-20 parts of thermosensitive resin, 1-5 parts of stabilizer and 1-10 parts of plasticizer.
2. The asphalt modifier of claim 1, wherein the thermoplastic elastomeric polymer comprises at least one of: the thermoplastic elastomer comprises a styrene-butadiene-styrene triblock copolymer, a styrene-isoprene-styrene triblock copolymer, a styrene-ethylene butylene copolymer-styrene triblock copolymer and a thermoplastic polyolefin elastomer, wherein the molecular weight of the thermoplastic elastomer polymer is 5-30 ten thousand, and the melt index is more than 8g/10 min.
3. The asphalt modifier according to claim 1, wherein the polyurethane elastomer is a polyester-based thermoplastic polyurethane having a molecular weight of 60000 to 100000.
4. The asphalt modifier of claim 1, wherein said modified petroleum resin comprises at least one of: modified carbon five resins, modified carbon nine resins, and modified terpene resins.
5. The asphalt modifier according to claim 1, wherein the heat-sensitive resin comprises at least one of: polyacrylonitrile resin and polyvinyl chloride resin.
6. The asphalt modifier of claim 1, wherein the stabilizer comprises at least one of: sulfur, calcium-zinc composite stabilizer and methyl tin stabilizer.
7. The asphalt modifier of claim 1, wherein the plasticizer comprises at least one of: dioctyl phthalate, naphthenic rubber oil, furfural extract oil, coumarone resin and stearic acid.
8. The preparation method of the asphalt modifier is characterized by comprising the following steps:
uniformly mixing the raw materials to obtain a first mixture, wherein the raw materials comprise the following raw materials in parts by weight: 15-60 parts of thermoplastic elastomer, 10-35 parts of polyurethane elastomer, 15-40 parts of petroleum resin, 5-20 parts of thermosensitive resin, 1-5 parts of stabilizer and 1-10 parts of plasticizer;
and melting and mixing the first mixture, extruding, cooling and drying to obtain the asphalt modifier.
9. The method for producing an asphalt modifier according to claim 8, characterized in that: the mixing temperature is 50-100 ℃;
the operations of the melt-kneading and the extrusion were carried out using a twin-screw extruder. The cylinder temperature of the double-screw extruder is 150-220 ℃, and the screw rotating speed of the double-screw extruder is 100-500 r/min.
10. Use of the asphalt modifier according to any one of claims 1 to 7 in asphalt mixtures.
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| CN202111604227.3A CN114276693B (en) | 2021-12-24 | 2021-12-24 | Asphalt modifier, preparation method and application |
| PCT/CN2022/072383 WO2023115672A1 (en) | 2021-12-24 | 2022-01-17 | Asphalt modifier, and preparation method therefor and use thereof |
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| CN202111604227.3A CN114276693B (en) | 2021-12-24 | 2021-12-24 | Asphalt modifier, preparation method and application |
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| WO2023115672A1 (en) | 2023-06-29 |
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