CN111138877A - High-viscosity modified asphalt and preparation method thereof - Google Patents
High-viscosity modified asphalt and preparation method thereof Download PDFInfo
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- CN111138877A CN111138877A CN202010060169.1A CN202010060169A CN111138877A CN 111138877 A CN111138877 A CN 111138877A CN 202010060169 A CN202010060169 A CN 202010060169A CN 111138877 A CN111138877 A CN 111138877A
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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
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention provides high-viscosity modified asphalt and a preparation method thereof, wherein the high-viscosity modified asphalt comprises the following components: the asphalt-based composite material comprises base asphalt, SEBS, polyurethane, a compatilizer, a chain extender, a coupling agent and a tackifier, wherein the SEBS, the polyurethane, the compatilizer, the chain extender, the coupling agent and the tackifier respectively account for (3-8)%, (3-15)%, (0.5-1)%, (0.2-0.8)%, (2-3)%, and (5-10)%, based on the mass of the base asphalt; the high-viscosity modified asphalt prepared by the method can meet the use requirements of high-cold low-temperature pavements, can effectively solve the problem of segregation in the asphalt and enables the performance of the modified asphalt to be more stable; meanwhile, the polyurethane modified asphalt is modified by a chemical modification method, so that the problem of segregation in the modified asphalt can be effectively solved, and the performance of the modified asphalt is more stable.
Description
Technical Field
The invention belongs to the technical field of modified asphalt materials, and particularly relates to high-viscosity modified asphalt and a preparation method thereof.
Background
With the rapid development of highway engineering technology in China, the highway traffic mileage is continuously increased, the overall convenience target of highway traffic is realized in most areas, and further requirements on the durability, comfort, safety and the like of the highway gradually become the development and research direction of novel highway pavement types. The large-gap asphalt mixture surface layer is adopted on the water-permeable asphalt pavement, so that the water-permeable and water-draining function of the asphalt pavement structure can be realized, the driving safety in rainy days or road surface water accumulation is ensured, and the asphalt pavement structure has the advantages of high anti-skid performance, high anti-rutting performance, high noise reduction function and the like. The water-permeable asphalt mixture has higher requirements on materials due to the special void structure, and high-viscosity asphalt with higher viscosity is required to be used as a binder to ensure the adhesion performance of the drainage mixture. In addition, China proposes a plan for building a sponge city, and the high-performance water-permeable asphalt pavement is a key link in the process of building the sponge city. In the road industry, development of related concepts requires higher performance, more durable asphalt cement systems.
The c ═ c double bond in the SEBS molecule is saturated due to hydrogenation, so that the SEBS has excellent weather resistance, ageing resistance, ultraviolet resistance, oxidation resistance and compression deformation resistance, the service temperature of the SEBS can reach 130 ℃, and the SEBS has good flexibility at-160 ℃, but the viscosity of the SEBS modified asphalt is low.
The invention adopts polyether polyurethane particles, and compared with common liquid polyurethane, the polyether polyurethane particles are low in price, and the preparation method of the modified asphalt is simple to operate and easy to construct.
Disclosure of Invention
The invention aims to provide high-viscosity modified asphalt and a preparation method thereof, and overcomes the defects in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides high-viscosity modified asphalt which comprises the following components: the asphalt comprises base asphalt, SEBS, polyurethane, a compatilizer, a chain extender, a coupling agent and a tackifier, wherein the SEBS, the polyurethane, the compatilizer, the chain extender, the coupling agent and the tackifier respectively account for (3-8)%, (3-15)%, (0.5-1)%, (0.2-0.8)%, (2-3)%, and (5-10)%, based on the mass of the base asphalt.
Preferably, the base asphalt is 90# base asphalt or 70# base asphalt.
Preferably, the SEBS is a linear structure.
Preferably, the polyurethane is polyether.
Preferably, the compatilizer is aromatic oil, wherein the content of fatty acid in the aromatic oil is 95%.
Preferably, the chain extender is 1, 4-butanediol.
Preferably, the coupling agent is a silane coupling agent.
Preferably, the tackifier is North America rock asphalt, and the content of natural asphalt in the North America rock asphalt is 26.8%; the particle diameter of the North America rock asphalt is less than 1.2 mm.
A preparation method of high-viscosity modified asphalt is based on the high-viscosity modified asphalt and comprises the following steps:
step 1, removing bubbles from matrix asphalt;
step 2, placing the matrix asphalt discharged with the bubbles in the step 1 on a constant-temperature heating furnace, heating to a molten state, adding SEBS (styrene-ethylene-butadiene-styrene) to obtain a mixture A, and shearing the mixture A;
step 3, sequentially adding a compatilizer, a chain extender and a coupling agent into the sheared mixture A, and shearing and uniformly mixing to obtain a mixture B;
step 4, adding the tackifier and polyurethane into the mixture B and shearing to obtain a mixture C;
and 5, placing the mixture C in an oven for development to obtain the high-viscosity modified asphalt.
Preferably, in step 2, the shearing process conditions are: shearing by using a shearing machine with the rotating speed of 4000-5000 r/min until the particle size of the material is 200 nm-2 um; in the step 3, the shearing process conditions are as follows: shearing at the temperature of 0-170 ℃ at the rotating speed of 4000-5000 r/min, and then enabling the mixture to be in a viscous flowing state; in the step 4, the shearing process conditions are as follows: shearing and shearing at the temperature of 160-170 ℃ at the rotating speed of 4000-5000 r/min, and then enabling the mixture to be in a viscous flowing state; in the step 4, the temperature of the polyurethane is 100-110 ℃; in step 5, the technological parameters of development in the oven are as follows: developing at 150-160 deg.C for 100-120 min.
Compared with the prior art, the invention has the beneficial effects that:
according to the high-viscosity modified asphalt and the preparation method thereof provided by the invention, C ═ C double bonds in SEBS molecules are hydrogenated to generate saturation, so that the SEBS has excellent heat resistance, oxidation resistance, ultraviolet resistance and heat resistance compared with SBS, and the SEBS can keep good flexibility at-60 ℃, the use temperature of the SEBS can reach 130 ℃, and the SEBS can be comparable to ethylene propylene rubber in the aspect of practical use; the addition of the polyurethane can obviously improve the low-temperature performance of the asphalt and meet the use requirements of high-cold low-temperature pavements; the addition of the compatilizer can effectively solve the problem of segregation in the asphalt, and the performance of the modified asphalt is more stable; meanwhile, the polyurethane modified asphalt is modified by a chemical modification method, so that the problem of segregation in the modified asphalt can be effectively solved, and the performance of the modified asphalt is more stable.
Detailed Description
The present invention is described in further detail below.
The invention provides high-viscosity modified asphalt which comprises the following components in parts by weight: the asphalt comprises base asphalt, SEBS, polyurethane, a compatilizer, a chain extender, a coupling agent and a tackifier, wherein the SEBS, the polyurethane, the compatilizer, the chain extender, the coupling agent and the tackifier respectively account for (3-8)%, (3-15)%, (0.5-1)%, (0.2-0.8)%, (2-3)%, and (5-10)%, based on the mass of the base asphalt.
The matrix asphalt adopts 90# matrix asphalt or 70# matrix asphalt.
The styrene-ethylene-butylene-styrene block copolymer (SEBS) is of a linear structure.
The polyurethane type is polyether type.
The compatilizer is aromatic oil, wherein the content of fatty acid is 95%.
The chain extender is 1, 4-butanediol, and colorless transparent liquid with the content of 1, 4-butanediol being more than 99.5 percent is selected.
The coupling agent is a silane coupling agent and is colorless transparent liquid.
The tackifier is North America rock asphalt, the content of natural asphalt in the North America rock asphalt is 26.8%, and the particle diameter of the North America rock asphalt is less than 1.2 mm.
The invention provides a preparation method of high-viscosity modified asphalt, which comprises the following steps:
step 1, weighing the following components in proportion: the asphalt-based composite material comprises base asphalt, SEBS, polyurethane, a compatilizer, a chain extender, a coupling agent and a tackifier, wherein the SEBS, the polyurethane, the compatilizer, the chain extender, the coupling agent and the tackifier respectively account for (3-8)%, (3-15)%, (0.5-1)%, (0.2-0.8)%, (2-3)%, and (5-10)%, based on the mass of the base asphalt;
step 2, preserving the heat of the matrix asphalt in an oven at 150-160 ℃ for 1h, and removing air bubbles in the matrix asphalt;
step 3, placing the heat-insulated matrix asphalt on a constant-temperature heating furnace, adding weighed SEBS into the asphalt to obtain a mixture A, and shearing the mixture A;
step 4, sequentially adding a compatilizer, a chain extender and a coupling agent into the sheared mixture A, and then shearing and uniformly mixing to obtain a mixture B;
and 5, adding the tackifier and the preheated polyurethane into the mixture B and shearing to obtain the polyurethane/SEBS composite high-viscosity modified asphalt.
In the step 3, heating the matrix asphalt to a molten state, specifically heating to 160-170 ℃, adding the weighed SEBS modifier into the matrix asphalt in the molten state, shearing the matrix asphalt by a shearing machine with the rotating speed of 4000-5000 r/min for not less than 40min, and cutting the material in a shearing gap by shearing, dispersing, impacting, turbulent flow and other processes generated between a rotor and a stator rotating at a high speed to rapidly break the material into particles of 200 nm-2 um, so that the SEBS modifier can be uniformly dispersed in the matrix asphalt, and simultaneously, the diffusion and permeability of asphalt components to a polymer network are ensured to obtain a mixture A;
step 4, sequentially adding the compatilizer, the chain extender and the coupling agent into the mixture A after shearing, and shearing at the temperature of 160-170 ℃ at the rotating speed of 4000-5000 r/min for not less than 20min to obtain a mixture B, wherein the mixture is in a viscous flowing state; the added compatilizer extract oil can enhance the dispersion degree of the SEBS in the asphalt, improve the compatibility between the asphalt and the SEBS and effectively reduce the processing difficulty caused by the large molecular weight of the modifier; the coupling agent improves the bonding property of the asphalt and the aggregate; the addition of the chain extender expands molecular chains and molecular weight, and is used for improving the mechanical property and the technological property of the polyurethane modified asphalt; mixture B did not require oven development.
In the step 5, North America rock asphalt and polyurethane which is heated to 100-110 ℃ in advance are added into the mixture B, and then the mixture C is sheared for not less than 40min at the temperature of 160-170 ℃ at the rotating speed of 4500-5000 r/min, so that the processed mixture is in a viscous flowing state;
and (3) putting the processed mixture into an oven at 150-160 ℃ for development for 100-120 min to obtain the SEBS/polyurethane composite modified asphalt.
Example 1:
the SEBS/polyurethane composite based high-viscosity modified asphalt comprises the following materials in parts by weight: 3% of polyurethane, 3% of SEBS modifier, 100% of 90# matrix asphalt, 0.5% of compatilizer, 0.2% of chain extender, 2% of coupling agent and 5% of North America rock asphalt.
The composite modified asphalt of the embodiment is prepared according to the following steps:
step 1, keeping the temperature of matrix asphalt in a 150 ℃ oven for 1h, and removing bubbles in the matrix asphalt;
step 2, heating the 90# matrix asphalt to 160 ℃, slowly adding the SEBS modifier, stirring at a low speed by using a stirrer, and shearing for 40min at 4500r/min at 160 ℃ after the SEBS is added;
step 3, adding a compatilizer, a chain extender and a coupling agent in sequence without oven development of the prepared SEBS modified asphalt, and shearing at the temperature of 160 ℃ at the rotating speed of 4500r/min for 20 min;
step 4, adding polyurethane into the blending system, heating to 90 ℃ in advance, simultaneously adding North America rock asphalt, and shearing for 40min under the conditions of the temperature and the shearing rate after the addition is finished;
and 5, putting the processed mixture into a drying oven at 150 ℃ for development for 100min to obtain the SEBS/polyurethane composite high-viscosity modified asphalt.
Example 2:
the SEBS/polyurethane composite based high-viscosity modified asphalt comprises the following materials in parts by weight: 9.4% of polyurethane, 4% of SEBS modifier, 100% of 90# matrix asphalt, 0.75% of compatilizer, 0.5% of chain extender, 2.5% of coupling agent and 8% of North America rock asphalt.
The composite modified asphalt of the embodiment is prepared according to the following steps:
step 1, keeping the temperature of the matrix asphalt in an oven at 155 ℃ for 1h, and removing bubbles in the matrix asphalt.
Step 2, heating the 90# matrix asphalt to 165 ℃, slowly adding the SEBS modifier, stirring at a low speed by using a stirrer, and shearing for 40min at the temperature of 165 ℃ at 4500r/min after the SEBS is added;
step 3, adding a compatilizer, a chain extender and a coupling agent in sequence without oven development of the prepared SEBS modified asphalt, and shearing at the temperature of 165 ℃ at the rotating speed of 4500r/min for 20 min;
step 4, adding polyurethane into the blending system, heating to 100 ℃ in advance, simultaneously adding North America rock asphalt, and shearing for 45min under the conditions of the temperature and the shearing rate after the addition is finished;
and 5, placing the processed mixture in an oven at 155 ℃ for development for 110min to obtain the SEBS/polyurethane composite high-viscosity modified asphalt.
Example 3:
the SEBS/polyurethane composite based high-viscosity modified asphalt comprises the following materials in parts by weight: 15% of polyurethane, 8% of SEBS modifier, 100% of 90# matrix asphalt, 1% of compatilizer, 0.8% of chain extender, 3% of coupling agent and 10% of North America rock asphalt.
The composite modified asphalt of the embodiment is prepared according to the following steps:
step 1, keeping the temperature of the matrix asphalt in a 160 ℃ oven for 1h, and removing bubbles in the matrix asphalt.
Step 2, heating the 90# matrix asphalt to 170 ℃, slowly adding the SEBS modifier, stirring at a low speed by using a stirrer, and shearing for 40min at the temperature of 170 ℃ at 5000r/min after the SEBS is added; (ii) a
Step 3, adding a compatilizer, a chain extender and a coupling agent in sequence without oven development of the prepared SEBS modified asphalt, and shearing at the temperature of 170 ℃ at the rotating speed of 5000r/min for 20 min;
step 4, adding polyurethane into the blending system, heating to 110 ℃ in advance, simultaneously adding North America rock asphalt, and shearing for 50min under the conditions of the temperature and the shearing rate after the addition is finished;
and 5, placing the processed mixture in a drying oven at 160 ℃ for development for 120min to obtain the SEBS/polyurethane composite high-viscosity modified asphalt.
Example 4:
the SEBS/polyurethane composite based high-viscosity modified asphalt comprises the following materials in parts by weight: 9.4% of polyurethane, 5% of SEBS modification, 100% of 90# matrix asphalt, 0.58% of compatilizer, 0.2% of chain extender, 2.7% of coupling agent and 5.3% of North America rock asphalt.
The composite modified asphalt of the embodiment is prepared according to the following steps:
step 1, keeping the temperature of the matrix asphalt in an oven at 150 ℃ for 1h, and removing bubbles in the matrix asphalt.
Step 2, heating the 90# matrix asphalt to 160 ℃, slowly adding the SEBS modifier, stirring at a low speed by using a stirrer, and shearing for 45min at 5000r/min at 160 ℃ after the SEBS is added;
step 3, adding a compatilizer, a chain extender and a coupling agent in sequence without oven development of the prepared SEBS modified asphalt, and shearing at the temperature of 160 ℃ at the rotating speed of 5000r/min for 20 min;
step 4, adding polyurethane into the blending system, heating to 90 ℃ in advance, simultaneously adding North America rock asphalt, and shearing for 45min under the conditions of the temperature and the shearing rate after the addition is finished;
and 5, putting the processed mixture into a drying oven at 150 ℃ for development for 120min to obtain the SEBS/polyurethane composite high-viscosity modified asphalt.
Testing the performance of the modified asphalt:
the samples of examples 1 to 4 were subjected to the following performance test.
The test tests comprise penetration, softening point, ductility (low temperature ductility, 5 ℃) and Brookfield viscosity at 135 ℃ and 175 ℃ of the samples in the examples, and refer to JTG E20-2011 test Specification for road engineering asphalt and asphalt mixtures.
Comparative example 1: SEBS modified asphalt
The SEBS modified asphalt is prepared by adding SEBS with the weight of 4% of that of the 90# matrix asphalt into the 90# matrix asphalt, and is directly provided by manufacturers in comparative example 1.
The results of the performance tests on the SEBS modified asphalt of comparative example 1 are shown in Table 1.
Comparative example 2: polyurethane modified asphalt
Comparative example 2 shows a polyurethane modified asphalt prepared by adding 11 wt% of polyurethane to 90# base asphalt, which was supplied directly from the manufacturer.
The results of the asphalt property test of this comparative example 2 are shown in Table 1.
TABLE 1 test results of respective indexes of the examples and comparative examples
As shown in Table 1, the penetration, softening point, low temperature ductility and viscosity test results of the inventive and comparative samples are shown. It can be seen from table 1 that comparative example 1(SEBS modified asphalt) has a lower softening point, making the high temperature stability of the asphalt pavement poor; compared with the comparative example 1, each index of the comparative example 2 (polyurethane modified asphalt) is stable, but the Brookfield viscosity at 135 ℃ does not meet the requirement of 1.5-3.0 Pa, so that the requirement of road conditions in high-temperature and rainy areas in China cannot be met; compared with the comparative examples 1 and 2, the samples of the 4 embodiments of the invention have the advantages that under the combined action of various modifiers and a plurality of materials, the indexes of the modified asphalt are obviously improved, the modified asphalt has higher softening point and certain improvement on ductility, the high-low temperature performance of the modified asphalt is obviously improved, and the viscosity of the modified asphalt is greatly improved. The method has strong technical advantages in high-temperature and rainy areas with high requirements on the high-temperature performance of the asphalt pavement.
Claims (10)
1. The high-viscosity modified asphalt is characterized by comprising the following components: the asphalt comprises base asphalt, SEBS, polyurethane, a compatilizer, a chain extender, a coupling agent and a tackifier, wherein the SEBS, the polyurethane, the compatilizer, the chain extender, the coupling agent and the tackifier respectively account for (3-8)%, (3-15)%, (0.5-1)%, (0.2-0.8)%, (2-3)%, and (5-10)%, based on the mass of the base asphalt.
2. The high-viscosity modified asphalt according to claim 1, wherein the base asphalt is 90# base asphalt or 70# base asphalt.
3. The high-viscosity modified asphalt according to claim 1, wherein said SEBS has a linear structure.
4. The high viscosity modified asphalt according to claim 1, wherein the polyurethane is polyether type.
5. The high-viscosity modified asphalt according to claim 1, wherein the compatilizer is aromatic oil, and the content of fatty acid in the aromatic oil is 95%.
6. The high-viscosity modified asphalt according to claim 1, wherein the chain extender is 1, 4-butanediol.
7. The high viscosity modified asphalt according to claim 1, wherein the coupling agent is a silane coupling agent.
8. The high-viscosity modified asphalt as claimed in claim 1, wherein the tackifier is North American rock asphalt, and the content of natural asphalt in the North American rock asphalt is 26.8%; the particle diameter of the North America rock asphalt is less than 1.2 mm.
9. A method for preparing high-viscosity modified asphalt, which is characterized in that the high-viscosity modified asphalt based on any one of claims 1 to 8 comprises the following steps:
step 1, removing bubbles from matrix asphalt;
step 2, placing the matrix asphalt discharged with the bubbles in the step 1 on a constant-temperature heating furnace, heating to a molten state, adding SEBS (styrene-ethylene-butadiene-styrene) to obtain a mixture A, and shearing the mixture A;
step 3, sequentially adding a compatilizer, a chain extender and a coupling agent into the sheared mixture A, and shearing and uniformly mixing to obtain a mixture B;
step 4, adding the tackifier and polyurethane into the mixture B and shearing to obtain a mixture C;
and 5, placing the mixture C in an oven for development to obtain the high-viscosity modified asphalt.
10. The method for preparing high-viscosity modified asphalt according to claim 9, wherein in the step 2, the shearing process conditions are as follows: shearing by using a shearing machine with the rotating speed of 4000-5000 r/min until the particle size of the material is 200 nm-2 um; in the step 3, the shearing process conditions are as follows: shearing at the temperature of 0-170 ℃ at the rotating speed of 4000-5000 r/min, and then enabling the mixture to be in a viscous flowing state; in the step 4, the shearing process conditions are as follows: shearing and shearing at the temperature of 160-170 ℃ at the rotating speed of 4000-5000 r/min, and then enabling the mixture to be in a viscous flowing state; in the step 4, the temperature of the polyurethane is 100-110 ℃; in step 5, the technological parameters of development in the oven are as follows: developing at 150-160 deg.C for 100-120 min.
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