CN111286209B - SBS high-viscosity modified emulsified asphalt material and preparation process thereof - Google Patents
SBS high-viscosity modified emulsified asphalt material and preparation process thereof Download PDFInfo
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Abstract
The invention discloses a method for SBS high viscosity modified emulsified asphalt; the preparation process is suitable for industrial production while modifying and emulsifying, has high viscosity on the premise of simple process, and the SBS high-viscosity modified emulsified asphalt obtained by the invention is suitable for ultrathin asphalt wearing layers on high-grade pavements and special adhesive layers of newly-built roads, and has the characteristics of easy construction, high softening point, good adhesion, easy storage, strong loosening resistance of the prepared asphalt wearing layer and the like.
Description
Technical Field
The invention belongs to the technical field of road engineering materials, and relates to an SBS high-viscosity modified emulsified asphalt material and a preparation process thereof.
Background
With the rapid development of road traffic industry in China, higher requirements are needed for road quality and maintenance technology. The emulsified asphalt has the advantages of economy, environmental protection, convenient construction and the like, and has been widely used in new roads and old road maintenance projects in recent years. Compared with common emulsified asphalt, the SBS modified emulsified asphalt is used as a special binding material in an adhesive layer and a sealing layer of a newly-repaired road, an interlayer and surface treatment in the reconstruction and maintenance of an old road and various introduction technologies, and can meet the requirements of modern traffic on high speed and heavy load. However, in the prior art, the research is less carried out on the emulsified asphalt for the road and bridge building materials, the industrial production is difficult to carry out by the existing preparation process, the product reproducibility is low, and the prepared SBS modified emulsified asphalt can not meet the corresponding performance requirements when being used as a special adhesive layer of a newly-built road and a special adhesive for surface treatment.
In the prior art, when preparing modified emulsified asphalt, the modified emulsified asphalt is prepared by mainly adopting the following three processes:
the process 1 comprises the steps of firstly emulsifying and then modifying, namely adding heated substrate asphalt and an emulsifier aqueous solution into a high-speed shearing machine together to prepare emulsified asphalt, and then adding modified emulsified asphalt at a modified latex preparation position.
And 2, mixing the latex modifier into an emulsifier aqueous solution, and then feeding the latex modifier and the asphalt into a colloid mill together to prepare the modified emulsified asphalt. This is the same as the traditional emulsified asphalt preparation process, does not need to make any changes to the production equipment, has requirements on the modifier dosage, and the latex machine is independent of the pH value of the soap solution. Meanwhile, in the process, the SBS modifier and the like cannot be swelled and crosslinked to form a stable network structure.
And 3, firstly modifying and then emulsifying, firstly modifying the asphalt by using a modifier, then introducing the modified asphalt after heating and an emulsifier aqueous solution into a colloid mill together for high-speed shearing to prepare the modified emulsified asphalt.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an SBS high-viscosity modified emulsified asphalt material and a preparation process thereof. The high-viscosity modified asphalt prepared by the chemical modification method has the characteristics of easy construction, high softening point, good adhesion, easy storage, strong loose resistance of the prepared asphalt wearing layer and the like.
The technical scheme adopted by the invention is as follows:
the SBS high-viscosity modified emulsified asphalt material comprises the following components in parts by weight: 100 parts of matrix asphalt, 3-5 parts of styrene butadiene styrene block polymer, 3-8 parts of waste rubber powder, 4-6 parts of compatilizer, 0.75-3 parts of plasticizer, 2-4 parts of tackifier, 0.25-2.1 parts of stabilizer, 0.5-2 parts of chemical modifier, 0.25-1 part of polypropylene glycol, 0.3-0.5 part of emulsifier, 0.2-0.4 part of hydrochloric acid and 30-33 parts of water. The stabilizer comprises a sulfur-containing stabilizer and an inorganic stabilizer, wherein the inorganic stabilizer is 0.05-0.1 part by mass, and the sulfur-containing stabilizer is 0.2-2 parts by mass.
Preferably, the base asphalt is grade 70 a road petroleum asphalt.
Preferably, the mesh number of the waste rubber powder is 30 meshes.
Preferably, the styrene butadiene styrene block polymer is linear, and the ratio of styrene to butadiene in the styrene butadiene styrene block polymer is 30:70 or 40: 60.
Preferably, the tackifier is a thermoplastic resin, and the thermoplastic resin is a terpene resin.
Preferably, the compatibilizer is a heavy aromatic oil and the plasticizer is a polyethylene wax.
Preferably, the chemical modifier is polyphosphoric acid, P2 O5The content is more than or equal to 80wt percent.
Preferably, the polypropylene glycol is polypropylene glycol PPG-400.
Preferably, the hydrochloric acid is industrial hydrochloric acid with the mass fraction of 36%.
Preferably, the inorganic stabilizer is calcium chloride.
The invention also provides a preparation process of the SBS high-viscosity modified emulsified asphalt, which comprises the following steps:
(1) weighing raw materials: accurately weighing raw materials of each component;
(2) preparation of SBS high viscosity modified asphalt
i. Heating the matrix asphalt to 150 ℃ and 160 ℃, adding the compatilizer, and stirring at the speed of 900r/min for 3-5 min.
Slowly adding a styrene butadiene styrene block polymer into the mixture obtained in the step i), and stirring for 3-5 min; slowly adding the waste rubber powder while stirring and stirring for 3-5min at the temperature of 160-170 ℃; then slowly adding the tackifier, the polypropylene glycol and the plasticizer while stirring, and stirring for 3-5min at the temperature of 160-170 ℃.
Swelling: keeping the mixture obtained in the step ii) at about 160-170 ℃, stirring for 10-15min, and stirring, mixing and swelling to obtain a crude asphalt product;
high shear: the temperature of the crude asphalt is raised to 170-180 ℃, the crude asphalt is placed into a high-speed shearing machine, meanwhile, 40-80 percent of the total amount of the sulfur-containing stabilizing agent is added, the rotating speed is raised to 3500-5000r/min, the high-speed shearing dispersion is carried out for 50-70min, and then the development at constant temperature is carried out to wait for the next emulsification.
(3) Preparing a soap solution: adding emulsifier, chemical modifier, residual sulfur-containing stabilizer, inorganic stabilizer, and hydrochloric acid into water at 60-80 deg.C, adjusting pH to 1.5-2.5 with hydrochloric acid, making into soap solution, and heating to 55-60 deg.C.
(4) Preparing SBS modified emulsified asphalt: and (3) mixing the SBS high-viscosity modified asphalt prepared in the step (2) and the soap solution prepared in the step (3), and shearing by a colloid mill to prepare the SBS high-viscosity modified emulsified asphalt.
Furthermore, when the sulfur-containing stabilizer is added, the sulfur-containing stabilizer is added in batches according to different rotating speeds, so that the SBS modified asphalt is kept from being separated out and presenting a vortex thick state without a modifier in the preparation process.
The invention discloses a SBS high-viscosity modified emulsified asphalt material and a preparation process thereof, which comprises the steps of firstly preparing high-viscosity modified asphalt with excellent fluidity, and then putting the residual modifier polyphosphoric acid dissolved in an emulsifier aqueous solution and the high-viscosity modified asphalt into a colloid mill together to prepare the finished product SBS high-viscosity modified emulsified asphalt. The principle is as follows: the invention adds polypropylene glycol into the high-viscosity modified asphalt in the first step, puts the reaction of polyphosphoric acid in the emulsifying step, and avoids the higher requirements on a colloid mill and other process equipment in the step of emulsifying after modification due to high viscosity of the traditional high-viscosity modified asphalt. Meanwhile, aiming at the problems that the polymer modifier for preparing the modified emulsified asphalt does not have chemical reaction with the matrix asphalt, so that the compatibility and the stability are poor and the asphalt is easy to separate, the SBS compound polyphosphoric acid with low price is used for carrying out chemical modification on the matrix asphalt, and the common physical tackifying effect of the terpene resin and the waste rubber powder is realized, so that the using amount of the SBS can be reduced, the production cost of the SBS modified asphalt is reduced, the stability of the SBS high-viscosity modified emulsified asphalt is obviously improved, and the separation is avoided.
Salt and ester are generated after the chemical reaction between the polyphosphoric acid and the matrix asphalt, asphalt micelle is converted into asphaltene to form an enlarged asphaltene structure, the distribution form of each component in the asphalt is optimized, the stable chemical bond connection is formed between the asphalt and the modifier in the blending process, and the interface compatibility and the modification effect are improved. And with the addition of polyphosphoric acid, the-C ═ C-double bonds with high bond energy in the butadiene block in the SBS are greatly opened and become active centers of reaction after being opened, so that the crosslinking effect between the SBS and the grafting effect between the SBS and the asphalt are increased. SBS crosslinks to form a network structure that can encapsulate the asphalt, preventing SBS and asphalt from separating. The grafting reaction product of SBS and asphalt is existed between SBS and asphalt interface to prevent SBS aggregation and make SBS compatible in asphalt. The PPA is added into the SBS modified asphalt, so that the consumption of the SBS can be reduced, the high-temperature storage stability of the asphalt is improved, the space network structure of the modified asphalt is enhanced, and the performance of the modified asphalt is improved.
The polyethylene wax added in advance improves the flowability of the high-viscosity modified asphalt in the emulsifying process, the polypropylene glycol added in advance also improves the fluidity of the high-viscosity modified asphalt in the emulsifying process and can react with polyphosphoric acid in an emulsifier aqueous solution to generate alkyl phosphate, so that the asphalt structure cannot be excessively transformed from a sol structure to a sol-gel structure, and the problem of preparation failure caused by over hardness in the preparation of the emulsified asphalt is solved.
Advantageous effects
The SBS high-viscosity modified emulsified asphalt disclosed by the invention has the characteristics of easiness in construction, high softening point, good adhesion, large low-temperature extensibility, stability in storage, excellent high-temperature stability, rutting resistance and ageing resistance, excellent low-temperature anti-cracking performance and fatigue resistance, high and low-temperature service performance, strong loose resistance of a prepared asphalt wearing layer and the like. The method is particularly suitable for areas with high temperature in summer and large temperature difference between day and night, is used for paving the pavement wearing layer of heavy traffic roads or drainage roads, effectively prevents the pavement wearing layer from being loosened, peeled off, functional cracks, low-temperature cracks, water invasion and other common pavement damages, and prolongs the service life of the pavement.
The SBS high-viscosity modified emulsified asphalt has the advantages of simple production method, no need of special equipment, lower reaction temperature, low energy consumption, less emission of harmful gases such as smoke and the like, and contribution to environmental protection.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
The SBS high-viscosity modified emulsified asphalt material comprises the following components in parts by weight: 100 parts of matrix asphalt, 3 parts of styrene butadiene styrene block polymer (SBS), 5 parts of waste rubber powder, 4 parts of compatilizer, 0.75 part of plasticizer, 3 parts of tackifier, 1 part of sulfur-containing stabilizer, 1 part of chemical modifier, 0.5 part of polypropylene glycol, 0.05 part of inorganic stabilizer, 0.3 part of emulsifier, 0.3 part of hydrochloric acid and 30 parts of water.
The matrix asphalt is No. 70A-grade road petroleum asphalt; the styrene to butadiene ratio of the styrene butadiene styrene block polymer was 30: 70. The mesh number of the waste rubber powder is 30 meshes; the compatilizer is heavy aromatic oil; the hydrochloric acid is industrial hydrochloric acid with the mass fraction of 36%; the inorganic stabilizer is calcium chloride; the polypropylene glycol is PPG-400; the tackifier is thermoplastic resin. The thermoplastic resin is a terpene resin. The chemical modifier is polyphosphoric acid; the plasticizer is polyethylene wax.
A preparation process of SBS high-viscosity modified emulsified asphalt comprises the following steps:
(1) weighing raw materials: accurately weighing raw materials of each component;
(2) preparation of SBS high viscosity modified asphalt
i. Heating the matrix asphalt to 150 ℃, adding the compatilizer, and stirring at the speed of 900r/min for 3 min.
ii) slowly adding SBS into the mixture obtained in the step i), and stirring for 3 min; slowly adding waste rubber powder without obvious particles while stirring, and stirring for 3min at 160 ℃; then slowly adding the tackifier, the polypropylene glycol and the plasticizer while stirring, and stirring for 3min at the temperature of 160 ℃.
Swelling: keeping the mixture obtained in the step ii) at about 160 ℃, stirring for 15min, stirring, mixing and swelling to obtain crude asphalt;
high shear: and raising the temperature of the crude asphalt to 170 ℃, putting the crude asphalt into a high-speed shearing machine, simultaneously adding 40 percent of the total amount of the sulfur-containing stabilizer, increasing the rotating speed to 4000r/min, and shearing and dispersing at a high speed for 50 min. Then development at constant temperature waits for the next emulsification.
(3) Preparing a soap solution: adding emulsifier, chemical modifier, residual sulfur-containing stabilizer, inorganic stabilizer, and hydrochloric acid into 70 deg.C water, adjusting pH to 1.5-2.5 with hydrochloric acid, making into soap solution, and heating to 60 deg.C.
(4) Preparing SBS modified emulsified asphalt: and (3) mixing the SBS high-viscosity modified asphalt prepared in the step (2) and the soap solution prepared in the step (3), and shearing by a colloid mill to prepare the SBS high-viscosity modified emulsified asphalt.
Example 2
The SBS high-viscosity modified emulsified asphalt material comprises the following components in parts by weight: 100 parts of matrix asphalt, 4 parts of Styrene Butadiene Styrene (SBS) block polymer, 8 parts of waste rubber powder, 5 parts of compatilizer, 2 parts of plasticizer, 4 parts of tackifier, 0.8 part of sulfur-containing stabilizer, 0.75 part of chemical modifier, 0.4 part of polypropylene glycol, 0.05 part of inorganic stabilizer, 0.3 part of emulsifier, 0.3 part of hydrochloric acid and 33 parts of water.
The matrix asphalt is No. 70A-grade road petroleum asphalt; the styrene to butadiene ratio of the styrene butadiene styrene block polymer was 40: 60. The mesh number of the waste rubber powder is 30 meshes; the compatilizer is heavy aromatic oil; the hydrochloric acid is industrial hydrochloric acid with the mass fraction of 36%; the inorganic stabilizer is calcium chloride; the polypropylene glycol is PPG-400; the tackifier is thermoplastic resin. The thermoplastic resin is a terpene resin. The chemical modifier is polyphosphoric acid; the plasticizer is polyethylene wax.
A preparation process of SBS high-viscosity modified emulsified asphalt comprises the following steps:
(1) weighing raw materials: accurately weighing raw materials of each component;
(2) preparation of SBS high viscosity modified asphalt
i. The matrix asphalt is heated to 155 ℃, the compatilizer is added, and the mixture is stirred for 4min at the speed of 900 r/min.
ii) slowly adding SBS into the mixture obtained in the step i), and stirring for 4 min; slowly adding waste rubber powder without obvious particles while stirring, and stirring for 4min at 165 ℃; then slowly adding the tackifier, the polypropylene glycol and the plasticizer while stirring, and stirring for 4min at the temperature of 165 ℃.
Swelling: keeping the mixture obtained in the step ii) at about 165 ℃, stirring for 15min, stirring, mixing and swelling to obtain crude asphalt;
high shear: and raising the temperature of the crude asphalt to 180 ℃, putting the crude asphalt into a high-speed shearing machine, simultaneously adding 60 percent of the total amount of the sulfur-containing stabilizer, increasing the rotating speed to 5000r/min, and shearing and dispersing at a high speed for 60 min. Then development at constant temperature waits for the next emulsification.
(3) Preparing a soap solution: adding emulsifier, chemical modifier, residual sulfur-containing stabilizer, inorganic stabilizer, and hydrochloric acid into water at 80 deg.C, adjusting pH to 1.5-2.5 with hydrochloric acid, making into soap solution, and heating to 55 deg.C for use.
(4) Preparing SBS modified emulsified asphalt: and (3) mixing the SBS high-viscosity modified asphalt prepared in the step (2) and the soap solution prepared in the step (3), and shearing by a colloid mill to prepare the SBS high-viscosity modified emulsified asphalt.
Example 3
The SBS high-viscosity modified emulsified asphalt material comprises the following components in parts by weight: 100 parts of matrix asphalt, 5 parts of styrene butadiene styrene block polymer (SBS), 6 parts of waste rubber powder, 6 parts of compatilizer, 2.5 parts of plasticizer, 4 parts of tackifier, 1 part of sulfur-containing stabilizer, 2 parts of chemical modifier, 1 part of polypropylene glycol, 0.05 part of inorganic stabilizer, 0.3 part of emulsifier, 0.3 part of hydrochloric acid and 32 parts of water.
The matrix asphalt is No. 70A-grade road petroleum asphalt; the styrene to butadiene ratio of the styrene butadiene styrene block polymer was 40: 60. The mesh number of the waste rubber powder is 30 meshes; the compatilizer is heavy aromatic oil; the hydrochloric acid is industrial hydrochloric acid with the mass fraction of 36%; the inorganic stabilizer is calcium chloride; the polypropylene glycol is PPG-400; the tackifier is thermoplastic resin. The thermoplastic resin is a terpene resin. The chemical modifier is polyphosphoric acid; the plasticizer is polyethylene wax.
A preparation process of SBS high-viscosity modified emulsified asphalt comprises the following steps:
(1) weighing raw materials: accurately weighing raw materials of each component;
(2) preparation of SBS high viscosity modified asphalt
i. Heating the matrix asphalt to 160 ℃, adding the compatilizer, and stirring at the speed of 900r/min for 5 min.
ii) slowly adding SBS into the mixture obtained in the step i), and stirring for 5 min; slowly adding waste rubber powder without obvious particles while stirring, and stirring for 5min at 170 ℃; then slowly adding the tackifier, the polypropylene glycol and the plasticizer while stirring, and stirring for 5min at the temperature of 170 ℃.
Swelling: keeping the mixture obtained in the step ii) at about 170 ℃, stirring for 15min, stirring, mixing and swelling to obtain crude asphalt;
high shear: and raising the temperature of the crude asphalt to 180 ℃, putting the crude asphalt into a high-speed shearing machine, simultaneously adding 80 percent of the total amount of the sulfur-containing stabilizer, increasing the rotating speed to 5000r/min, and shearing and dispersing at a high speed for 70 min. Then development at constant temperature waits for the next emulsification.
(3) Preparing a soap solution: adding emulsifier, chemical modifier, residual sulfur-containing stabilizer, inorganic stabilizer, and hydrochloric acid into water at 80 deg.C, adjusting pH to 1.5-2.5 with hydrochloric acid, making into soap solution, and heating to 60 deg.C for use.
(4) Preparing SBS modified emulsified asphalt: and (3) mixing the SBS high-viscosity modified asphalt prepared in the step (2) and the soap solution prepared in the step (3), and shearing by a colloid mill to prepare the SBS high-viscosity modified emulsified asphalt.
The properties of the SBS high-viscosity modified emulsified asphalt materials prepared in the examples 1-3 are detected, and the detection results are as follows:
the data in the table show that the indexes of the embodiments 1, 2 and 3 all meet the requirements of technical Specification for Highway construction (JTGF40-2004) on the modified emulsified asphalt, and the index data are superior to the test results of the comparative example.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and all equivalent changes and modifications made based on the features and principles described in the claims of the present invention are included in the scope of the present invention.
Claims (8)
1. The preparation method of the SBS high-viscosity modified emulsified asphalt material is characterized by comprising the following components in parts by mass: 100 parts of matrix asphalt, 3-5 parts of styrene butadiene styrene block polymer, 3-8 parts of waste rubber powder, 4-6 parts of compatilizer, 0.75-3 parts of plasticizer, 2-4 parts of tackifier, 0.25-2.1 parts of stabilizer, 0.5-2 parts of chemical modifier, 0.25-1 part of polypropylene glycol, 0.3-0.5 part of emulsifier, 0.2-0.4 part of hydrochloric acid and 30-33 parts of water; the chemical modifier is polyphosphoric acid;
the stabilizer comprises a sulfur-containing stabilizer and an inorganic stabilizer, wherein the inorganic stabilizer is 0.05-0.1 part by mass, and the sulfur-containing stabilizer is 0.2-2 parts by mass;
the preparation steps are as follows:
(1) weighing raw materials: accurately weighing raw materials of each component;
(2) preparation of SBS high viscosity modified asphalt
i. Heating the matrix asphalt to 150 ℃ and 160 ℃, adding the compatilizer, and stirring;
slowly adding a styrene butadiene styrene block polymer into the mixture obtained in the step i), and stirring for 3-5 min; slowly adding the waste rubber powder while stirring, uniformly stirring, and stirring for 3-5min at the temperature of 160-170 ℃; slowly adding the tackifier, the polypropylene glycol and the plasticizer while stirring, and stirring for 3-5min at the temperature of 160-170 ℃;
swelling: carrying out swelling reaction on the mixture obtained in the step ii) to obtain crude asphalt;
high shear: heating the crude asphalt to 170-180 ℃, putting the crude asphalt into a high-speed shearing machine, and adding the crude asphalt
Shearing and dispersing 40-80% of the total amount of the sulfur-containing stabilizer to obtain SBS high-viscosity modified asphalt;
(3) preparing soap solution, adding emulsifier, chemical modifier, residual sulfur-containing stabilizer, inorganic stabilizer and hydrochloric acid into water of 60-80 deg.C, adjusting pH to 1.5-2.5, and making into soap solution;
(4) preparing SBS modified emulsified asphalt: and (3) mixing the SBS high-viscosity modified asphalt prepared in the step (2) with the soap liquid prepared in the step (3), and shearing by a colloid mill to prepare the SBS high-viscosity modified emulsified asphalt.
2. The method for preparing SBS high viscosity modified emulsified asphalt material according to claim 1, wherein the method comprises the following steps: the matrix asphalt is No. 70 road petroleum asphalt; the styrene to butadiene ratio of the styrene butadiene styrene block polymer is 30:70 or 40: 60.
3. The method for preparing SBS high viscosity modified emulsified asphalt material according to claim 1, wherein the method comprises the following steps: the mesh number of the waste rubber powder is 30 meshes; the compatilizer is heavy aromatic oil; the hydrochloric acid is industrial hydrochloric acid with the mass fraction of 36%; the polypropylene glycol is polypropylene glycol PPG-400; the plasticizer is polyethylene wax; the tackifier is thermoplastic resin.
4. The method for preparing SBS high viscosity modified emulsified asphalt material according to claim 3, wherein: the thermoplastic resin is a terpene resin.
5. The method for preparing SBS high viscosity modified emulsified asphalt material according to claim 1, wherein the method comprises the following steps: the inorganic stabilizer is calcium chloride.
6. The method for preparing SBS high viscosity modified emulsified asphalt material according to claim 1, wherein the method comprises the following steps: the stirring speed in the step i) is 900r/min, and the stirring time is 3-5 min.
7. The method for preparing SBS high viscosity modified emulsified asphalt material according to claim 1, wherein the method comprises the following steps: the temperature of the swelling reaction in the step iii) is 160-170 ℃, and the reaction time is 10-15 min.
8. The method for preparing SBS high viscosity modified emulsified asphalt material according to claim 1, wherein the method comprises the following steps: the rotation speed of the shearing dispersion in the step iv) is 3500-5000r/min, and the reaction time is 50-70 min.
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| CN111675913A (en) * | 2020-06-28 | 2020-09-18 | 江阴市新远见工程有限公司 | Anti-aging SBS (styrene butadiene styrene) modified asphalt and preparation method thereof |
| CN112898791B (en) * | 2021-03-31 | 2022-08-12 | 长安大学 | Composite modified emulsified asphalt and preparation method thereof |
| CN113527713A (en) * | 2021-07-06 | 2021-10-22 | 景德镇新越沥青有限公司 | High-viscosity colored emulsified asphalt and preparation method thereof |
| CN115322584B (en) * | 2022-09-29 | 2023-09-12 | 江苏中路工程技术研究院有限公司 | High-viscosity modified emulsified asphalt binder and preparation method and application thereof |
| CN116622249B (en) * | 2023-05-29 | 2024-10-15 | 武汉工程大学 | High-solid-content high-viscosity high-elasticity modified emulsified asphalt and preparation method thereof |
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