CN111019370A - Environment-friendly asphalt and preparation method thereof - Google Patents
Environment-friendly asphalt and preparation method thereof Download PDFInfo
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- CN111019370A CN111019370A CN201911365614.9A CN201911365614A CN111019370A CN 111019370 A CN111019370 A CN 111019370A CN 201911365614 A CN201911365614 A CN 201911365614A CN 111019370 A CN111019370 A CN 111019370A
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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
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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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/04—Thermoplastic elastomer
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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
- C08L2555/00—Characteristics of bituminous mixtures
- C08L2555/40—Mixtures based upon bitumen or asphalt containing functional additives
- C08L2555/80—Macromolecular constituents
- C08L2555/84—Polymers comprising styrene, e.g., polystyrene, styrene-diene copolymers or styrene-butadiene-styrene copolymers
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Abstract
The invention relates to the technical field of asphalt materials, in particular to environment-friendly asphalt and a preparation method thereof. The environment-friendly asphalt at least comprises the following components in percentage by weight: 75-88% of modified asphalt, 1-3% of ductility enhancer, 7-20% of anti-aging agent and 0.5-2% of cooling agent. The invention adds modifier and auxiliary agent into the base asphalt to fully improve the road performance of the asphalt, including temperature sensitivity, high temperature stability, low temperature crack resistance, water damage, aging resistance, reducing the discharge temperature of the mixture, and the low-carbon construction condition has a certain protection function to the environment.
Description
Technical Field
The invention relates to the technical field of asphalt materials, in particular to environment-friendly asphalt and a preparation method thereof.
Background
The asphalt has unique functions and characteristics of strong bonding capability, thermoplasticity, higher carbon residue value, easy graphitization of carbonized products and the like, and is cheap and easy to obtain. Therefore, asphalt has proved to be a valuable product in both the traditional fields of carbon material industry, refractory material industry, building industry, etc., and the emerging fields of aerospace, new energy, new materials, etc.
The asphalt material originates from the United states of the last 60 years, enters China later in the century, is applied to pavement of large-span steel bridge decks such as Nanjing Yangtze river secondary bridge, Runyangjiang river bridge, Nanjing Yangtze river triple bridge, Hangzhou Bay bridge, Zhanjiang Bay bridge and the like in China successively as a steel bridge deck pavement material, and is a pavement material with very excellent performance. However, the asphalt contains more carcinogenic polycyclic aromatic hydrocarbon, especially strong carcinogenic benzo [ a ] pyrene, which seriously harms human health and pollutes environment, and the asphalt is restricted in Europe in the 60 th century in view of environmental protection requirements.
In recent years, the research and application of the rubber modified asphalt are obviously increased, and the rubber modified asphalt meets the resource recycling and environmental protection ideas advocated by the nation. According to the invention, the modifier and the novel auxiliary agent are added into the matrix asphalt, so that the pavement performance of the asphalt, including temperature sensitivity, high-temperature stability, low-temperature crack resistance, water damage, aging resistance, reduction of the discharge temperature of the mixture, and the environment protection function of key low-carbon construction, is fully improved.
Disclosure of Invention
In order to solve the technical problems, the first aspect of the invention provides an environment-friendly asphalt, which at least comprises the following components in percentage by weight: 75-88% of modified asphalt, 1-2% of ductility enhancer, 7-20% of anti-aging agent and 0.5-2% of cooling agent.
As a preferable technical scheme of the invention, the modified asphalt is asphalt modified by a styrene thermoplastic elastomer.
In a preferred embodiment of the present invention, the styrene-based thermoplastic elastomer contains 20 to 50% of styrene.
In a preferred embodiment of the present invention, the dynamic viscosity of the asphalt at 60 ℃ is not less than 180 pas.
As a preferable technical scheme of the invention, the softening point of the asphalt is not lower than 40 ℃.
As a preferable technical scheme of the invention, the preparation method of the modified asphalt at least comprises the following steps:
(1) adding asphalt into a high-temperature tank at 135-150 ℃, and continuously heating to 170-180 ℃;
(2) transferring the asphalt in the high-temperature tank to a reaction kettle, simultaneously adding the styrene thermoplastic elastomer into the reaction kettle, starting a stirrer, and stirring for 1-2 h;
(3) and starting a colloid mill, grinding the mixed asphalt and the styrene thermoplastic elastomer for 0.5-2h, directly transferring to a development tank at the temperature of 160-175 ℃, stirring at high temperature for development for 3-6h, and discharging to obtain the asphalt.
As a preferable technical scheme of the invention, the cooling agent at least comprises the following components in parts by weight: 35-60 parts of tall oil fatty acid, 20-40 parts of maleic anhydride, 10-20 parts of water and 2-8 parts of emulsifier.
As a preferred technical scheme of the invention, the weight ratio of the tall oil fatty acid to the maleic anhydride is (1-2): 1.
as a preferable technical scheme of the invention, the preparation method of the cooling agent at least comprises the following steps:
(1) mixing tall oil fatty acid and maleic anhydride, stirring and heating to 145-165 ℃, and then continuing stirring for 1.5-3 h;
(2) then cooling to 70-90 ℃, adding water, and stirring for 2-4 h;
(3) finally, adding the emulsifier, stirring for 0.5-2h, and discharging to obtain the product.
The second aspect of the invention provides a preparation method of the environment-friendly asphalt, which at least comprises the following steps:
(1) adding the modified asphalt into a mixing tank with a stirrer, and keeping the temperature at 170-180 ℃;
(2) adding an anti-aging agent, and stirring for 1-2h at the stirring temperature of 165-175 ℃;
(3) adding a ductility enhancer, stirring for 1-2h at the temperature of 160-;
(4) adding a cooling agent, stirring for 0.5-1h at the stirring temperature of 150-.
Has the advantages that: the invention adds modifier and auxiliary agent into the base asphalt to fully improve the road performance of the asphalt, including temperature sensitivity, high temperature stability, low temperature crack resistance, water damage, aging resistance, reducing the discharge temperature of the mixture, and the low-carbon construction condition has a certain protection function to the environment.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The term "prepared from …" as used herein is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
The conjunction "consisting of …" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.
Approximating language, as used herein throughout the specification and claims, is intended to modify a quantity, such that the invention is not limited to the specific quantity, but includes portions that are literally received for modification without substantial change in the basic function to which the invention is related. Accordingly, the use of "about" to modify a numerical value means that the invention is not limited to the precise value. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.
In order to solve the technical problems, the first aspect of the invention provides an environment-friendly asphalt, which at least comprises the following components in percentage by weight: 75-88% of modified asphalt, 1-3% of ductility enhancer, 7-20% of anti-aging agent and 0.5-2% of cooling agent.
Preferably, the environment-friendly asphalt at least comprises the following components in percentage by weight: 82.2% of modified asphalt, 2% of ductility enhancer, 15% of anti-aging agent and 0.8% of cooling agent.
Modified asphalt
In the invention, the modified asphalt is asphalt modified by styrene thermoplastic elastomer.
Preferably, the styrene-based thermoplastic elastomer has a styrene content of 20 to 50%.
The styrene thermoplastic elastomer is at least one selected from styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), styrene-ethylene-butylene-styrene block copolymer (SEBS) and styrene-ethylene-propylene-styrene block copolymer (SEPS).
Preferably, the styrene thermoplastic elastomer is a styrene-butadiene-styrene block copolymer (abbreviated as SBS).
More preferably, the styrene-butadiene-styrene block copolymer has a styrene content of 40%.
The styrene-butadiene-styrene block copolymer is available from, without particular limitation, the petrochemical Yuanyang stone oil division, model number: 791-H.
In the invention, the dynamic viscosity of the asphalt at 60 ℃ is not less than 180 Pa.s.
Preferably, the asphalt has a softening point of not less than 46 ℃.
More preferably, the asphalt has a softening point of 48 to 49 ℃.
Preferably, the penetration index of the asphalt is-2 to 1.
More preferably, the penetration index of the asphalt is-1.627.
The source of the bitumen, without particular limitation, is commercially available from, but not limited to, midsea bitumen (thazhou) llc, model: AH-70.
In the invention, the weight ratio of the asphalt to the styrene thermoplastic elastomer is 100: (2-6).
Preferably, the weight ratio of the asphalt to the styrene thermoplastic elastomer is 100: (3.6-4.2).
More preferably, the weight ratio of the asphalt to the styrene-based thermoplastic elastomer is 100: 4.
in the invention, the preparation method of the modified asphalt at least comprises the following steps:
(1) adding asphalt into a high-temperature tank at 135-150 ℃, and continuously heating to 170-180 ℃;
(2) transferring the asphalt in the high-temperature tank to a reaction kettle, simultaneously adding the styrene thermoplastic elastomer into the reaction kettle, starting a stirrer, and stirring for 1-2 h;
(3) and starting a colloid mill, grinding the mixed asphalt and the styrene thermoplastic elastomer for 0.5-2h, directly transferring to a development tank at the temperature of 160-175 ℃, stirring at high temperature for development for 3-6h, and discharging to obtain the asphalt.
Preferably, the preparation method of the modified asphalt comprises the following steps:
(1) adding asphalt into a high-temperature tank at 140 ℃, and continuously heating to 175 ℃;
(2) transferring the asphalt in the high-temperature tank to a reaction kettle, simultaneously adding the styrene thermoplastic elastomer into the reaction kettle, starting a stirrer, and stirring for 1.5 hours;
(3) and (3) starting a colloid mill, grinding the mixed asphalt and styrene thermoplastic elastomer for 1h, directly transferring to a development tank at 170 ℃, stirring at high temperature for development for 4h, and discharging to obtain the asphalt.
The inventor finds that adding 2-6% of styrene-butadiene-styrene block copolymer into asphalt can improve the low-temperature flexibility and high-temperature flow resistance of the asphalt; the low-temperature flexibility of the asphalt is improved, so that the hardening, the brittleness and the cracking of the asphalt at low temperature can be reduced, and the service life of the asphalt is prolonged; meanwhile, the high-temperature flow resistance of the asphalt can be improved, and the softening flow of the asphalt at high temperature is reduced.
Delay-increasing agent
In the present invention, the ductility enhancer is not particularly limited.
As a preference, mention may be made, without being limited thereto, of the china oil eastern petrochemicals limited, model: ZYJ-01.
The inventor believes that the asphalt ductility enhancer adopted by the invention can effectively solve the problem of poor low-temperature ductility of the modified asphalt, can obviously improve the pre-drying ductility of the modified asphalt and effectively improve the post-drying ductility of the modified asphalt.
Anti-aging agent
In the present invention, the aging inhibitor is not particularly limited.
As a preferred example, there may be mentioned, but not limited to, nantong rongyancheng road and bridge materials science and technology development ltd, model: (ATB) RCGHNM-101.
The inventor thinks that the anti-aging agent selected by the invention can effectively enhance the anti-aging capability of the matrix asphalt, inhibit the high-temperature oxidation and aging of the modified asphalt, optimize the performance indexes of the modified asphalt, such as softening point, ductility, viscosity and the like, ensure that the high molecular polymer in the asphalt is not degraded and the indexes are not attenuated, and optimize the performance of the modified asphalt mixture, thereby prolonging the service life of the modified asphalt. In addition, the anti-aging agent adopted by the invention can greatly reduce the preparation cost, reduce asphalt smoke and harmful gases and play a role in protecting the environment to a certain extent.
Temperature reducing agent
In the invention, the cooling agent at least comprises the following components in parts by weight: 35-60 parts of tall oil fatty acid, 20-40 parts of maleic anhydride, 10-20 parts of water and 2-8 parts of emulsifier.
Preferably, the weight ratio of the tall oil fatty acid to the maleic anhydride is (1-2): 1.
more preferably, the weight ratio of tall oil fatty acid to maleic anhydride is 1.7: 1.
most preferably, the cooling agent comprises the following components: 51 parts of tall oil fatty acid, 30 parts of maleic anhydride, 15 parts of water and 5 parts of emulsifier.
As a preference, the emulsifier is not particularly limited, and there may be mentioned, but not limited to, seaan petrochemical company, model number: OP-30.
In the invention, the preparation method of the cooling agent at least comprises the following steps:
(1) mixing tall oil fatty acid and maleic anhydride, stirring and heating to 145-165 ℃, and then continuing stirring for 1.5-3 h;
(2) then cooling to 70-90 ℃, adding water, and stirring for 2-4 h;
(3) finally, adding the emulsifier, stirring for 0.5-2h, and discharging to obtain the product.
Preferably, the preparation method of the cooling agent comprises the following steps:
(1) mixing tall oil fatty acid and maleic anhydride, stirring and heating to 155 ℃, and continuing stirring for 2 hours;
(2) then cooling to 80 ℃, adding water, and stirring for 3 h;
(3) and finally, adding the emulsifier, stirring for 1h, and discharging to obtain the product.
The asphalt is a high molecular mixture composed of asphaltene, colloid, aromatic hydrocarbon and saturated hydrocarbon, the asphaltene is dispersed in the aromatic hydrocarbon and the saturated hydrocarbon by means of the colloid to form a colloid structure, when the content of the asphaltene is low, the asphalt has good cohesiveness, plasticity and fluidity but poor temperature stability and elasticity, the polymer modifier is similar to the asphaltene in the asphalt, and the added polymer modifier is fully melted and expanded with the asphalt to adsorb the aromatic hydrocarbon and the colloid in the asphalt to form a new colloid. The prepared cooling agent consists of a lipophilic group and a hydrophilic group, a large amount of surfactant micelles are in contact with hot asphalt under mechanical stirring in the process of mixing the mixture, and water molecules on the periphery of the micelles are rapidly evaporated and dissipated, so that the lipophilic group is in contact with the asphalt; the residual water molecules which are not lost are combined with the hydrophilic groups of the surfactant, so that a large number of structural water films with lubricating function are formed among the asphalt coated with the aggregate; through the lubricating action of the structure water film, the mixing performance of the mixture is increased, and the asphalt cement is prevented from agglomerating to a certain extent. Not only retains or increases the cohesiveness, plasticity and fluidity of the original asphalt, but also improves the temperature, stability and elasticity of the asphalt, thereby achieving the purposes of improving the pavement performance of the asphalt and reducing the mixing temperature.
The second aspect of the invention provides a preparation method of the environment-friendly asphalt, which at least comprises the following steps:
(1) adding the modified asphalt into a mixing tank with a stirrer, and keeping the temperature at 170-180 ℃;
(2) adding an anti-aging agent, and stirring for 1-2h at the stirring temperature of 165-175 ℃;
(3) adding a ductility enhancer, stirring for 1-2h at the temperature of 160-;
(4) adding a cooling agent, stirring for 0.5-1h at the stirring temperature of 150-.
Preferably, the preparation method of the environment-friendly asphalt comprises the following steps:
(1) adding the modified asphalt into a mixing tank with a stirrer, and keeping the temperature at 175 ℃;
(2) adding an anti-aging agent, and stirring for 1.5h at the stirring temperature of 170 ℃;
(3) adding a ductility enhancer, and stirring for 1.5h at the stirring temperature of 165 ℃;
(4) adding a cooling agent, stirring for 0.5h at 155 ℃, and discharging to obtain the product.
The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.
In addition, the starting materials used are all commercially available, unless otherwise specified.
Examples
Example 1
Embodiment 1 provides an environment-friendly asphalt, which comprises the following components in percentage by weight: 82.2% of modified asphalt, 2% of ductility enhancer, 15% of anti-aging agent and 0.8% of cooling agent.
The modified asphalt is asphalt modified by styrene-butadiene-styrene block copolymer; the styrene-butadiene-styrene block copolymer was purchased from medium petrochemical yueyanite oil division, type: 791-H; the bitumen was purchased from midsea bitumen (thazhou) llc, model number: AH-70; the weight ratio of the asphalt to the styrene thermoplastic elastomer is 100: 4.
the preparation method of the modified asphalt comprises the following steps:
(1) adding asphalt into a high-temperature tank at 140 ℃, and continuously heating to 175 ℃;
(2) transferring the asphalt in the high-temperature tank to a reaction kettle, simultaneously adding the styrene thermoplastic elastomer into the reaction kettle, starting a stirrer, and stirring for 1.5 hours;
(3) and (3) starting a colloid mill, grinding the mixed asphalt and styrene thermoplastic elastomer for 1h, directly transferring to a development tank at 170 ℃, stirring at high temperature for development for 4h, and discharging to obtain the asphalt.
The ductility enhancer is selected from China sea oil Dongying petrochemical company, model number: ZYJ-01.
The anti-aging agent is selected from Nantong Rong road and bridge Material science and technology development Limited, model: (ATB) RCGHNM-101.
The cooling agent comprises the following components: 51 parts of tall oil fatty acid, 30 parts of maleic anhydride, 15 parts of water and 5 parts of OP-30 emulsifier;
the preparation method of the cooling agent comprises the following steps:
(1) mixing tall oil fatty acid and maleic anhydride, stirring and heating to 155 ℃, and continuing stirring for 2 hours;
(2) then cooling to 80 ℃, adding water, and stirring for 3 h;
(3) and finally, adding the emulsifier, stirring for 1h, and discharging to obtain the product.
The preparation method of the environment-friendly asphalt comprises the following steps:
(1) adding the modified asphalt into a mixing tank with a stirrer, and keeping the temperature at 175 ℃;
(2) adding an anti-aging agent, and stirring for 1.5h at the stirring temperature of 170 ℃;
(3) adding a ductility enhancer, and stirring for 1.5h at the stirring temperature of 165 ℃;
(4) adding a cooling agent, stirring for 0.5h at 155 ℃, and discharging to obtain the product.
Example 2
Embodiment 2 provides an environment-friendly asphalt, which comprises the following components in percentage by weight: 78.5 percent of modified asphalt, 1 percent of ductility enhancer, 20 percent of anti-aging agent and 0.5 percent of cooling agent.
The modified asphalt is asphalt modified by styrene-butadiene-styrene block copolymer; the styrene-butadiene-styrene block copolymer was purchased from medium petrochemical yueyanite oil division, type: 791-H; the bitumen was purchased from midsea bitumen (thazhou) llc, model number: AH-70; the weight ratio of the asphalt to the styrene thermoplastic elastomer is 100: 2.
the preparation method of the modified asphalt comprises the following steps:
(1) adding asphalt into a high-temperature tank at 140 ℃, and continuously heating to 175 ℃;
(2) transferring the asphalt in the high-temperature tank to a reaction kettle, simultaneously adding the styrene thermoplastic elastomer into the reaction kettle, starting a stirrer, and stirring for 1.5 hours;
(3) and (3) starting a colloid mill, grinding the mixed asphalt and styrene thermoplastic elastomer for 1h, directly transferring to a development tank at 170 ℃, stirring at high temperature for development for 4h, and discharging to obtain the asphalt.
The ductility enhancer is selected from China sea oil Dongying petrochemical company, model number: ZYJ-01.
The anti-aging agent is selected from Nantong Rong road and bridge Material science and technology development Limited, model: (ATB) RCGHNM-101.
The cooling agent comprises the following components: 51 parts of tall oil fatty acid, 30 parts of maleic anhydride, 15 parts of water and 5 parts of OP-30 emulsifier;
the preparation method of the cooling agent comprises the following steps:
(1) mixing tall oil fatty acid and maleic anhydride, stirring and heating to 155 ℃, and continuing stirring for 2 hours;
(2) then cooling to 80 ℃, adding water, and stirring for 3 h;
(3) and finally, adding the emulsifier, stirring for 1h, and discharging to obtain the product.
The preparation method of the environment-friendly asphalt comprises the following steps:
(1) adding the modified asphalt into a mixing tank with a stirrer, and keeping the temperature at 175 ℃;
(2) adding an anti-aging agent, and stirring for 1.5h at the stirring temperature of 170 ℃;
(3) adding a ductility enhancer, and stirring for 1.5h at the stirring temperature of 165 ℃;
(4) adding a cooling agent, stirring for 0.5h at 155 ℃, and discharging to obtain the product.
Example 3
Embodiment 3 provides an environment-friendly asphalt, which comprises the following components in percentage by weight: 88% of modified asphalt, 3% of ductility enhancer, 7% of anti-aging agent and 2% of cooling agent.
The modified asphalt is asphalt modified by styrene-butadiene-styrene block copolymer; the styrene-butadiene-styrene block copolymer was purchased from medium petrochemical yueyanite oil division, type: 791-H; the bitumen was purchased from midsea bitumen (thazhou) llc, model number: AH-70; the weight ratio of the asphalt to the styrene thermoplastic elastomer is 100: 6.
the preparation method of the modified asphalt comprises the following steps:
(1) adding asphalt into a high-temperature tank at 140 ℃, and continuously heating to 175 ℃;
(2) transferring the asphalt in the high-temperature tank to a reaction kettle, simultaneously adding the styrene thermoplastic elastomer into the reaction kettle, starting a stirrer, and stirring for 1.5 hours;
(3) and (3) starting a colloid mill, grinding the mixed asphalt and styrene thermoplastic elastomer for 1h, directly transferring to a development tank at 170 ℃, stirring at high temperature for development for 4h, and discharging to obtain the asphalt.
The ductility enhancer is selected from China sea oil Dongying petrochemical company, model number: ZYJ-01.
The anti-aging agent is selected from Nantong Rong road and bridge Material science and technology development Limited, model: (ATB) RCGHNM-101.
The cooling agent comprises the following components: 51 parts of tall oil fatty acid, 30 parts of maleic anhydride, 15 parts of water and 5 parts of OP-30 emulsifier;
the preparation method of the cooling agent comprises the following steps:
(1) mixing tall oil fatty acid and maleic anhydride, stirring and heating to 155 ℃, and continuing stirring for 2 hours;
(2) then cooling to 80 ℃, adding water, and stirring for 3 h;
(3) and finally, adding the emulsifier, stirring for 1h, and discharging to obtain the product.
The preparation method of the environment-friendly asphalt comprises the following steps:
(1) adding the modified asphalt into a mixing tank with a stirrer, and keeping the temperature at 175 ℃;
(2) adding an anti-aging agent, and stirring for 1.5h at the stirring temperature of 170 ℃;
(3) adding a ductility enhancer, and stirring for 1.5h at the stirring temperature of 165 ℃;
(4) adding a cooling agent, stirring for 0.5h at 155 ℃, and discharging to obtain the product.
Example 4
Example 4 differs from example 1 in that no temperature reducing agent is included.
Performance testing
1. The technical indexes of the environment-friendly asphalt provided by the example 1 are shown in a table 1.
2. High temperature stability test
And (3) evaluating the high-temperature stability of the environment-friendly asphalt mixture by adopting a rutting test according to road engineering asphalt and asphalt mixture test procedures (JTG E20-2011).
The test piece and the test mold are placed at normal temperature for 12 hours, then placed in an oven with the test temperature of 60 +/-1 ℃ for heat preservation for 5 hours, and then the test piece and the test mold are placed on a test platform of a wheel track testing machine, so that the test wheel is ensured to be in the middle of the test, the solid rubber wheel is repeatedly rolled for a certain time, the wheel pressure is 0.7MPa +/-0.05 MPa, and the running direction of the rubber wheel is consistent with the rolling direction of the test piece. And taking the depth and the dynamic stability of the formed rutting groove as evaluation indexes of the rutting resistance of the asphalt mixture. The rut test results are shown in table 2. The dimensions of the rut plate are 300mm by 50 mm.
TABLE 2 rutting test results for the eco-friendly asphalts provided in examples 1 and 4
As can be seen from Table 2: compared with the embodiment 4, the dynamic stability of the asphalt mixture provided by the embodiment 1 added with the temperature reducing agent is obviously increased by 25.6%; meanwhile, the total deformation of the asphalt mixture provided by the embodiment 1 is also obviously reduced, the average rutting depth of the asphalt mixture provided by the embodiment 4 in 60min is 1.94mm, and the average rutting depth of the asphalt mixture provided by the embodiment 1 is 1.54mm, which is reduced by 19.9%. Therefore, the asphalt mixture provided by the embodiment 1 has good high-temperature stability, and has good application and popularization prospects in high-temperature areas, long and large longitudinal slopes and other road sections with high requirements for high-temperature stability.
3. Water stability test
Dividing the formed Marshall test pieces into two groups according to the test regulations for road engineering asphalt and asphalt mixture (JTG E20-2011), placing 6 test pieces (3 example 1; 3 example 4) in each group in a water bath at 60 ℃, preserving the heat of one group for 30min, and measuring the stability MS of the test pieces by using an automatic Marshall tester; and keeping the temperature for another group for 48 hours, and measuring the stability MS1 of the test piece. The water stability of the asphalt mixture was evaluated by the residual stability MS 0. The results of the residual stability test are shown in Table 3.
TABLE 3 residual stability test results for the eco-friendly asphalts provided in examples 1 and 4
As can be seen from Table 3: compared with the asphalt mixture provided by the example 4 without the temperature reducing agent, the marshall residual stability of the asphalt mixture provided by the example 1 with the temperature reducing agent is basically consistent and meets the specification requirements. This shows that the asphalt mixture prepared by the method has good water stability even if the temperature reducing agent is added.
4. Low temperature crack resistance test
And (3) according to road engineering asphalt and asphalt mixture test regulations (JTG E20-2011), evaluating the low-temperature crack resistance of the warm-mixed asphalt mixture by adopting a low-temperature bending failure test. The rolled rut plate is cut into specified sizes, the length is 250mm +/-2.0 mm, the width is 30mm +/-2.0 mm, and the height is 35mm +/-2.0 mm. And placing the test piece in an environment box with the temperature of minus 10 +/-0.5 ℃ for 5 hours to ensure that the overall temperature of the test piece reaches minus 10 +/-0.5 ℃, placing the test piece on a support for loading, and testing the low-temperature crack resistance of the two asphalt mixtures. The results of the low temperature bending test are shown in Table 4.
TABLE 4 examples 1 and 4 provide the results of the low temperature bending test conducted to obtain environmentally friendly asphalt
As can be seen from Table 4: compared with the asphalt mixture provided by the embodiment 4, the bending tensile strength mean value of the asphalt mixture provided by the embodiment 1 is reduced from 16.482MPa to 13.830MPa, and the reduction amplitude is 16.1%; the mean stiffness modulus is increased from 3355.029MPa to 4341.097MPs, the increase is 29.4%, and in addition, the bending failure strain of the asphalt mixture provided by the example 1 is reduced, and the reduction is 35.5%, so that the low-temperature crack resistance of the asphalt mixture provided by the example 1 is reduced compared with the asphalt mixture provided by the example 4, but the indexes meet the specification requirements.
Tests show that the technical indexes of the embodiments 2 to 3 all meet the specification requirements.
(1) In the invention, the cooling agent is directly added into the asphalt when the asphalt is heated to the specified temperature (the temperature required by construction specifications), and the environment-friendly asphalt is prepared only by simple mechanical stirring. The technology has simple production process, does not need to increase equipment and is convenient to use.
(2) Compared with the asphalt mixture without the cooling agent, the asphalt mixture with the cooling agent has the advantages that the performance indexes such as penetration degree, softening point, ductility and the like do not change much, but the dynamic viscosity at 135 ℃ is obviously reduced, and the reduction range reaches 22.2%. The lower dynamic viscosity is beneficial to reducing the heating temperature of the asphalt, the heating temperature of the mineral aggregate and the mixing temperature of the mixture, improves the workability of low-temperature construction, and reduces the heating and mixing temperatures by 25-35 ℃ compared with the asphalt mixture without the cooling agent.
(3) In the invention, the cooling agent is added, so that the viscosity of the asphalt is obviously reduced, and the high-temperature stability of the asphalt mixture is also improved. Compared with the pavement performance of the asphalt mixture without the cooling agent, the dynamic stability of the asphalt mixture is remarkably improved by 25.6 percent, and other technical performance indexes meet the standard requirements.
(4) The environment-friendly asphalt technology provided by the invention has the advantages of simple production process, obvious viscosity reduction and cooling effects and obvious effect of improving the high-temperature anti-rutting performance of the asphalt mixture. The production process is smokeless and odorless, and can generate good energy-saving and emission-reducing benefits. The product is applied to asphalt pavement construction, can prolong the construction time of the asphalt pavement, reduces the smoke emission during construction, and can be widely applied to tunnel asphalt pavements, urban road asphalt pavements and asphalt pavement construction in different climatic regions.
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (10)
1. The environment-friendly asphalt is characterized by at least comprising the following components in percentage by weight: 75-88% of modified asphalt, 1-3% of ductility enhancer, 7-20% of anti-aging agent and 0.5-2% of cooling agent.
2. The environment-friendly asphalt according to claim 1, wherein the modified asphalt is asphalt modified by a styrene-based thermoplastic elastomer.
3. The environment-friendly asphalt as claimed in claim 2, wherein the styrene-based thermoplastic elastomer contains 20-50% of styrene.
4. The environment-friendly asphalt according to claim 2, wherein the asphalt has a dynamic viscosity at 60 ℃ of not less than 180 Pa-s.
5. The environment-friendly asphalt according to claim 2, wherein the weight ratio of the asphalt to the styrene thermoplastic elastomer is 100: (2-6).
6. A process for the preparation of a modified bitumen according to any of claims 1 to 5, characterised in that it comprises at least the following steps:
(1) adding asphalt into a high-temperature tank at 135-150 ℃, and continuously heating to 170-180 ℃;
(2) transferring the asphalt in the high-temperature tank to a reaction kettle, simultaneously adding the styrene thermoplastic elastomer into the reaction kettle, starting a stirrer, and stirring for 1-2 h;
(3) and starting a colloid mill, grinding the mixed asphalt and the styrene thermoplastic elastomer for 0.5-2h, directly transferring to a development tank at the temperature of 160-175 ℃, stirring at high temperature for development for 3-6h, and discharging to obtain the asphalt.
7. The environment-friendly asphalt according to claim 1, wherein the temperature reducing agent comprises at least the following components in parts by weight: 35-60 parts of tall oil fatty acid, 20-40 parts of maleic anhydride, 10-20 parts of water and 2-8 parts of emulsifier.
8. The environment-friendly asphalt according to claim 7, wherein the weight ratio of the tall oil fatty acid to the maleic anhydride is (1-2): 1.
9. the environment-friendly asphalt according to claim 7, wherein the preparation method of the temperature reducing agent at least comprises the following steps:
(1) mixing tall oil fatty acid and maleic anhydride, stirring and heating to 145-165 ℃, and then continuing stirring for 1.5-3 h;
(2) then cooling to 70-90 ℃, adding water, and stirring for 2-4 h;
(3) finally, adding the emulsifier, stirring for 0.5-2h, and discharging to obtain the product.
10. A method for preparing environment-friendly asphalt according to any one of claims 1 to 9, characterized by comprising at least the following steps:
(1) adding the modified asphalt into a mixing tank with a stirrer, and keeping the temperature at 170-180 ℃;
(2) adding an anti-aging agent, and stirring for 1-2h at the stirring temperature of 165-175 ℃;
(3) adding a ductility enhancer, stirring for 1-2h at the temperature of 160-;
(4) adding a cooling agent, stirring for 0.5-1h at the stirring temperature of 150-.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113303142A (en) * | 2021-06-18 | 2021-08-27 | 邢志强 | Greenhouse and cooling method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113303142A (en) * | 2021-06-18 | 2021-08-27 | 邢志强 | Greenhouse and cooling method thereof |
| CN113303142B (en) * | 2021-06-18 | 2023-10-31 | 邢志强 | Greenhouse and cooling method thereof |
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