High-viscosity and high-elasticity emulsified asphalt capable of being stably stored and preparation method of high-viscosity and high-elasticity emulsified asphalt

Abstract

The invention discloses high-viscosity and high-elasticity emulsified asphalt capable of being stably stored. The high-viscosity and high-elasticity emulsified asphalt comprises the following components in parts by weight: 100 parts of matrix asphalt, 5-8 parts of an SBS modifier, 3-5 parts of aromatic hydrocarbon rubber oil, 0.1-0.2 part of sulfur, 70-110 parts of water, 2-3.5 parts of an emulsifier, 2-10 parts of phosphoric acid and 4-5 parts of mother liquor. The high-viscosity and high-elasticity modified asphalt is prepared by using the SBS modifier, the high-viscosity and high-elasticity modified asphalt is emulsified by adopting a special emulsification process, and a certain amount of mother liquor is added into the emulsified high-viscosity and high-elasticity modified asphalt, so that the stability of the emulsified high-viscosity and high-elasticity modified asphalt is promoted, and segregation is not easy to occur. The prepared high-viscosity and high-elasticity emulsified asphalt has wide application prospects in the fields of micro-surfacing, cold-mixed and cold-laid thin layers, sand-containing fog seal layers and the like. The invention also provides a preparation method of the high-viscosity and high-elasticity emulsified asphalt capable of being stably stored.

Description

Technical Field

[0001] The invention belongs to the technical field of road construction materials, and in particular relates to a high-viscosity and high-elastic emulsified asphalt that can be stably stored and a preparation method thereof. Background Art

[0002] Traditional hot-mix asphalt mixtures consume a lot of energy and emit a lot of smoke during the implementation process. In response to this defect of hot-mix asphalt mixtures, people began to develop cold-mix cold-paved asphalt systems. The core of the cold-mix cold-paved system is emulsified asphalt. The performance of emulsified asphalt directly determines whether the cold-mix cold-paved asphalt mixture can be successfully implemented, and its road performance and durability after implementation.

[0003] Due to the restrictions of emulsified asphalt, the existing cold mix cold paving system has certain differences in durability and pavement performance compared with traditional hot mix asphalt mixtures. The main reason is that the technical standards for cold mix cold paving with ordinary emulsified asphalt as the core material are low, and the pavement after implementation generally has problems such as low strength and poor durability. The emulsified asphalt obtained by emulsifying high-performance modified asphalt generally has the problem of poor stability. It is difficult to control the workability of the mixture during cold mix cold paving construction, which can easily cause problems such as uneven distribution of asphalt on cold paved pavements and aggregate segregation.

[0004] Therefore, developing a high-viscosity and high-elastic emulsified asphalt that can be stably stored, improving the strength and durability of cold-mix and cold-paved asphalt mixtures, and improving construction and workability are of practical significance for promoting the promotion and application of cold-mix and cold-paving technology. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a high-viscosity and high-elastic emulsified asphalt that can be stably stored and a preparation method thereof, so as to solve the problems in the prior art of low strength and poor durability of ordinary cold-mixed and cold-paved mixtures, poor stability of emulsified asphalt in the modified system, and difficulty in controlling construction and workability, resulting in uneven distribution of asphalt on cold-paved pavements and aggregate segregation.

[0006] The high-viscosity and high-elastic emulsified asphalt that can be stably stored described in the present invention is characterized in that it includes the following components in parts by mass: 100 parts of base asphalt, 5-8 parts of SBS modifier, 3-5 parts of rubber oil, 0.1-0.2 parts of sulfur, 70-110 parts of water, 2-3.5 parts of emulsifier, 2-10 parts of pH adjuster, and 5-10 parts of mother liquor.

[0007] Furthermore, the high-viscosity and high-elastic emulsified asphalt that can be stably stored is characterized in that the base asphalt is 70# road petroleum asphalt.

[0008] Furthermore, the high-viscosity and high-elastic emulsified asphalt that can be stably stored is characterized in that the SBS modifier is a styrene-butadiene-styrene block copolymer, one or more of the linear structures, the S / B ratio is 30 / 70, and the average molecular weight is 80,000 to 120,000.

[0009] Furthermore, the high-viscosity and high-elastic emulsified asphalt that can be stably stored is characterized in that the emulsifier is one or more of cationic quaternary ammonium salts or amide salts.

[0010] Furthermore, the high-viscosity and high-elastic emulsified asphalt that can be stably stored is characterized in that the pH regulator is concentrated phosphoric acid.

[0011] Furthermore, the high-viscosity and high-elastic emulsified asphalt that can be stably stored is characterized in that the mother liquor is a compound of sodium carboxymethyl cellulose, poly (N-isopropylacrylamide) and water, and the compounding ratio is 2.5 to 5:5 to 7.5:90.

[0012] Furthermore, the method for preparing the stably storable high-viscosity and high-elastic emulsified asphalt is characterized in that the method comprises the following steps:

[0013] 1) Heat the base asphalt according to the mass fraction, first add the SBS modifier and rubber oil into the asphalt and shear at high speed for 30 minutes, then add sulfur and continue shearing for 30 minutes, and then place the modified asphalt in an oven for heat preservation and development to obtain a high-viscosity and high-elasticity modified asphalt.

[0014] 2) adding an emulsifier by mass into water and dispersing it evenly, adjusting the temperature and adding phosphoric acid to adjust the pH to prepare a soap solution;

[0015] 3) compounding sodium carboxymethyl cellulose, poly(N-isopropylacrylamide) and water according to mass to obtain a mother solution;

[0016] 4) Use a high-speed shearing machine to shear the prepared soap solution at a certain speed, then slowly add the heated high-viscosity and high-elasticity modified asphalt, and increase the speed of the shearing machine. After the asphalt is completely added, continue to shear at high speed for 5 to 10 minutes to obtain a semi-finished high-viscosity and high-elasticity emulsified asphalt.

[0017] 5) Add the semi-finished high-viscosity and high-elastic emulsified asphalt and the mother liquor into the colloid mill in turn, and shear for 1 minute to obtain the high-viscosity and high-elastic emulsified asphalt that can be stably stored.

[0018] Furthermore, the method for preparing a high-viscosity and high-elastic emulsified asphalt that can be stably stored is characterized in that the heating temperature of the base asphalt in step 1) is 170-180°C, the insulation development temperature is 170-180°C, and the time is 4 hours; the adjustment temperature in step 2) is 60-70°C, and the pH is adjusted to 1-3.

[0019] Furthermore, the method for preparing a high-viscosity and high-elastic emulsified asphalt that can be stably stored is characterized in that the soap solution shear rate in step 4) is 2000-3000 r / min, the heating temperature of the high-viscosity and high-elastic modified asphalt is 170-180°C, and the increased shear rate is 9000-11000 r / min.

[0020] By adopting the above technical solution, the present invention has the following characteristics:

[0021] 1) The present invention adopts a special double shearing process to fully shear the asphalt particles, greatly reducing the difficulty of emulsifying the high-viscosity and high-elasticity modified asphalt. High-speed shearing preliminarily emulsifies the high-viscosity and high-elasticity modified asphalt, while reducing the temperature of the mixture to avoid excessive temperature and boiling during the subsequent colloid mill emulsification process. The process is simple, operability is strong, and safety is high.

[0022] 2) In the present invention, mother liquor is added during the emulsification process, and sodium carboxymethyl cellulose and poly (N-isopropylacrylamide) in the mother liquor form a semi-interpenetrating network structure in the emulsified asphalt, thereby increasing the consistency of the emulsified asphalt, making the emulsified asphalt appear viscous / gel-like, reducing the movement speed of the emulsion particles, and avoiding particle aggregation, thereby greatly improving the stability of the high-viscosity and high-elasticity emulsified asphalt. DETAILED DESCRIPTION

[0023] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments (the five embodiments recorded in the present invention are all operation data recorded in a laboratory environment), but the content of the present invention is not limited to the following embodiments.

[0024] The base asphalt selected in the present invention is preferably Qilu 70# base asphalt;

[0025] The SBS modifier selected in the present invention is preferably linear SBS791, with a molecular weight of 80,000 to 120,000 and an S / B ratio of 30 / 70;

[0026] The emulsifier selected in the present invention is preferably a cationic amide salt or a slow-cracking emulsifier;

[0027] The pH regulator selected in the present invention is preferably phosphoric acid, H3PO 4 The concentration is 80-90%;

[0028] The sodium carboxymethyl cellulose and poly (N-isopropylacrylamide) selected in the present invention are preferably analytically pure reagents provided by Shanghai MacLean Biochemical Technology Co., Ltd.

[0029] Embodiment 1:

[0030] A high-viscosity and high-elastic emulsified asphalt that can be stably stored, characterized in that it includes the following components in parts by mass: 100 parts of base asphalt, 5 parts of SBS modifier, 3 parts of rubber oil, 0.1 parts of sulfur, 70 parts of water, 2.5 parts of emulsifier, 4 parts of pH adjuster, and 7 parts of mother liquor.

[0031] The specific method for preparing the high-viscosity and high-elastic emulsified asphalt that can be stably stored is characterized in that the method comprises the following steps:

[0032] 1) Heat the base asphalt to 170°C by mass, first add SBS modifier and rubber oil into the asphalt, high-speed shear at a rate of 5000r / min for 30min, then add sulfur and continue shearing for 30min, then place the modified asphalt in an oven at 170°C for 4h to obtain high-viscosity and high-elasticity modified asphalt.

[0033] 2) adding emulsifier by mass into water and dispersing evenly, adjusting the temperature to 65° C., and adding phosphoric acid to adjust the pH to 2.5 to prepare a soap solution;

[0034] 3) compounding sodium carboxymethyl cellulose, poly(N-isopropylacrylamide) and water according to their mass to obtain a mother solution, with the compounding ratio being 2.5:7.5:90;

[0035] 4) Use a high-speed shearing machine to shear the prepared soap solution at 2500r / min (the shearing can be carried out for about 5 minutes), and then slowly add the heated high-viscosity and high-elasticity modified asphalt (for example, the soap solution can be poured in at a relatively uniform speed for about 3 minutes), and increase the shearing machine speed to 9000r / min. After the asphalt is completely added, continue to shear at high speed for 7 minutes to obtain a semi-finished high-viscosity and high-elasticity emulsified asphalt.

[0036] 5) Add the semi-finished high-viscosity and high-elastic emulsified asphalt and the mother liquor into the colloid mill in turn, and shear for 1 minute to obtain the high-viscosity and high-elastic emulsified asphalt that can be stably stored.

[0037] Embodiment 2:

[0038] A high-viscosity and high-elastic emulsified asphalt that can be stably stored, characterized in that it includes the following components by mass: 100 parts of base asphalt, 5 parts of SBS modifier, 3 parts of rubber oil, 0.1 parts of sulfur, 90 parts of water, 2 parts of emulsifier, 4 parts of pH adjuster, and 5 parts of mother liquor.

[0039] The specific method for preparing the high-viscosity and high-elastic emulsified asphalt that can be stably stored is characterized in that the method comprises the following steps:

[0040] 1) Heat the base asphalt to 170°C by mass, first add SBS modifier and rubber oil into the asphalt, high-speed shear at a rate of 5000r / min for 30min, then add sulfur and continue shearing for 30min, then place the modified asphalt in an oven at 170°C for 4h to obtain high-viscosity and high-elasticity modified asphalt.

[0041] 2) adding the emulsifier by mass into water and dispersing it evenly, adjusting the temperature to 70° C., and adding phosphoric acid to adjust the pH to 3 to prepare a soap solution;

[0042] 3) compounding sodium carboxymethyl cellulose, poly(N-isopropylacrylamide) and water according to their mass to obtain a mother solution, with the compounding ratio being 2.5:7.5:90;

[0043] 4) Use a high-speed shearing machine to shear the prepared soap solution at 2000r / min (the shearing can be carried out for about 5 minutes), and then slowly add the heated high-viscosity and high-elasticity modified asphalt (for example, the soap solution can be poured in at a relatively uniform speed for about 3 minutes), and increase the shearing machine speed to 9000r / min. After the asphalt is completely added, continue to shear at high speed for 5 minutes to obtain a semi-finished high-viscosity and high-elasticity emulsified asphalt.

[0044] 5) Add the semi-finished high-viscosity and high-elastic emulsified asphalt and the mother liquor into the colloid mill in turn, and shear for 1 minute to obtain the high-viscosity and high-elastic emulsified asphalt that can be stably stored.

[0045] Embodiment 3:

[0046] A high-viscosity and high-elastic emulsified asphalt that can be stably stored, characterized in that it includes the following components by mass: 100 parts of base asphalt, 8 parts of SBS modifier, 5 parts of rubber, 0.2 parts of sulfur, 110 parts of water, 2.5 parts of emulsifier, 8 parts of pH adjuster, and 6 parts of mother liquor.

[0047] The specific method for preparing the high-viscosity and high-elastic emulsified asphalt that can be stably stored is characterized in that the method comprises the following steps:

[0048] 1) Heat the base asphalt to 180°C by mass, first add SBS modifier and rubber oil into the asphalt, high-speed shear for 30 minutes at a rate of 5000r / min, then add sulfur and continue shearing for 30 minutes, and then place the modified asphalt in an oven at 180°C for 4 hours to obtain high-viscosity and high-elasticity modified asphalt.

[0049] 2) adding the emulsifier by mass into water and dispersing it evenly, adjusting the temperature to 70° C., and adding phosphoric acid to adjust the pH to 2.5 to prepare a soap solution;

[0050] 3) compounding sodium carboxymethyl cellulose, poly(N-isopropylacrylamide) and water according to their mass to obtain a mother solution, with the compounding ratio being 5:5:90;

[0051] 4) Use a high-speed shearing machine to shear the prepared soap solution at 3000r / min (the shearing can be carried out for about 5 minutes), and then slowly add the heated high-viscosity and high-elasticity modified asphalt (for example, the soap solution can be poured in at a relatively uniform speed for about 4 minutes), and increase the shearing machine speed to 9000r / min. After the asphalt is completely added, continue to shear at high speed for 5 minutes to obtain a semi-finished high-viscosity and high-elasticity emulsified asphalt.

[0052] 5) Add the semi-finished high-viscosity and high-elastic emulsified asphalt and the mother liquor into the colloid mill in turn, and shear for 1 minute to obtain the high-viscosity and high-elastic emulsified asphalt that can be stably stored.

[0053] Embodiment 4:

[0054] A high-viscosity and high-elastic emulsified asphalt that can be stably stored, characterized in that it includes the following components by mass: 100 parts of base asphalt, 8 parts of SBS modifier, 5 parts of rubber, 0.2 parts of sulfur, 90 parts of water, 3 parts of emulsifier, 8 parts of pH adjuster, and 8 parts of mother liquor.

[0055] The specific method for preparing the high-viscosity and high-elastic emulsified asphalt that can be stably stored is characterized in that the method comprises the following steps:

[0056] 1) Heat the base asphalt to 180°C by mass, first add SBS modifier and rubber oil into the asphalt, high-speed shear for 30 minutes at a rate of 5000r / min, then add sulfur and continue shearing for 30 minutes, and then place the modified asphalt in an oven at 180°C for 4 hours to obtain high-viscosity and high-elasticity modified asphalt.

[0057] 2) adding the emulsifier by mass into water and dispersing it evenly, adjusting the temperature to 70° C., and adding phosphoric acid to adjust the pH to 2.0 to prepare a soap solution;

[0058] 3) compounding sodium carboxymethyl cellulose, poly(N-isopropylacrylamide) and water according to their mass to obtain a mother solution, with the compounding ratio being 5:5:90;

[0059] 4) Use a high-speed shearing machine to shear the prepared soap solution at 3000r / min (the shearing can be carried out for about 6 minutes), and then slowly add the heated high-viscosity and high-elasticity modified asphalt (for example, the soap solution can be poured in at a relatively uniform speed for about 5 minutes), and increase the shearing machine speed to 10000r / min. After the asphalt is completely added, continue to shear at high speed for 7 minutes to obtain a semi-finished high-viscosity and high-elasticity emulsified asphalt.

[0060] 5) Add the semi-finished high-viscosity and high-elastic emulsified asphalt and the mother liquor into the colloid mill in turn, and shear for 1 minute to obtain the high-viscosity and high-elastic emulsified asphalt that can be stably stored.

[0061] Embodiment 5:

[0062] A high-viscosity and high-elastic emulsified asphalt that can be stably stored, characterized in that it includes the following components in parts by mass: 100 parts of base asphalt, 8 parts of SBS modifier, 5 parts of rubber, 0.2 parts of sulfur, 70 parts of water, 3.5 parts of emulsifier, 10 parts of pH adjuster, and 10 parts of mother liquor.

[0063] The specific method for preparing the high-viscosity and high-elastic emulsified asphalt that can be stably stored is characterized in that the method comprises the following steps:

[0064] 1) Heat the base asphalt to 180°C by mass, first add SBS modifier and rubber oil into the asphalt, high-speed shear for 30 minutes at a rate of 5000r / min, then add sulfur and continue shearing for 30 minutes, and then place the modified asphalt in an oven at 180°C for 4 hours to obtain high-viscosity and high-elasticity modified asphalt.

[0065] 2) adding the emulsifier by mass into water and dispersing it evenly, adjusting the temperature to 70° C., and adding phosphoric acid to adjust the pH to 1.5 to prepare a soap solution;

[0066] 3) compounding sodium carboxymethyl cellulose, poly(N-isopropylacrylamide) and water according to their mass to obtain a mother solution, with the compounding ratio being 5:5:90;

[0067] 4) Use a high-speed shearing machine to shear the prepared soap solution at 3000r / min (the shearing can be carried out for about 6 minutes), and then slowly add the heated high-viscosity and high-elasticity modified asphalt (for example, the soap solution can be poured in at a relatively uniform speed for about 6 minutes), and increase the shearing machine speed to 11000r / min. After the asphalt is completely added, continue to shear at high speed for 10 minutes to obtain a semi-finished high-viscosity and high-elasticity emulsified asphalt.

[0068] 5) Add the semi-finished high-viscosity and high-elastic emulsified asphalt and the mother liquor into the colloid mill in turn, and shear for 1 minute to obtain the high-viscosity and high-elastic emulsified asphalt that can be stably stored.

[0069] Table 1 Performance test results of high-viscosity and high-elastic emulsified asphalt prepared in Examples 1 to 5

[0070]

[0071]

[0072] It can be seen from the above test results that the high-viscosity and high-elasticity emulsified asphalt prepared in the embodiment has reasonable components, and the asphalt particles are fully sheared through the double shear process, which reduces the difficulty of high-viscosity and high-elasticity emulsified asphalt. The high amount of SBS modifier makes the emulsified asphalt have excellent road performance and durability. The addition of mother liquor greatly improves the stability of high-viscosity and high-elasticity emulsified asphalt, thereby improving the cold mix cold paving system and the problem of difficult control of workability. In summary, the present invention effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0073] The above embodiments are only for the purpose of clearly illustrating the principles and effects of the present invention, and are not intended to limit the embodiments of the present invention. A person skilled in the art of the present invention may modify or alter the above embodiments based on the above description, and such modifications or alterations shall still be covered by the claims of the present invention.

Claims

1. A high-viscosity and high-elastic emulsified asphalt that can be stably stored, characterized in that: The invention comprises the following components in parts by weight: 100 parts of base asphalt, 5-8 parts of SBS modifier, 3-5 parts of rubber oil, 0.1-0.2 parts of sulfur, 70-110 parts of water, 2-3.5 parts of emulsifier, 2-10 parts of pH adjuster and 5-10 parts of mother liquor.

2. According to claim 1, a high-viscosity and high-elastic emulsified asphalt that can be stably stored is characterized in that: The base asphalt is 70# road petroleum asphalt.

3. The high-viscosity and high-elastic emulsified asphalt that can be stably stored according to claim 1, characterized in that: The SBS modifier is a styrene-butadiene-styrene block copolymer, one or more of a linear structure, an S / B ratio of 30 / 70, and an average molecular weight of 80,000 to 120,000.

4. The high-viscosity and high-elastic emulsified asphalt that can be stably stored according to claim 1, characterized in that: The emulsifier is one or more of cationic quaternary ammonium salts or amide salts.

5. The high-viscosity and high-elastic emulsified asphalt that can be stably stored according to claim 1, characterized in that: The pH adjuster is phosphoric acid.

6. The high-viscosity and high-elastic emulsified asphalt that can be stably stored according to claim 1, characterized in that: The mother liquor is a compound of sodium carboxymethyl cellulose, poly (N-isopropylacrylamide) and water, and the compounding ratio is 2.5-5:5-7.5:

90.

7. A method for preparing a stably storable high-viscosity and high-elastic emulsified asphalt as claimed in claim 1, characterized in that: The method comprises the following steps: 1) Heat the base asphalt according to the mass fraction, first add the SBS modifier and rubber oil into the asphalt and shear at high speed for 30 minutes, then add sulfur and continue shearing for 30 minutes, and then place the modified asphalt in an oven for heat preservation and development to obtain a high-viscosity and high-elasticity modified asphalt; 2) Add the emulsifier to water according to the mass proportion and disperse it evenly, adjust the temperature and add phosphoric acid to adjust the pH to prepare a soap solution; 3) compounding sodium carboxymethyl cellulose, poly (N-isopropylacrylamide) and water according to parts by mass to obtain a mother solution; 4) Use a high-speed shearing machine to shear the prepared soap solution at a certain speed, then slowly add the heated high-viscosity and high-elasticity modified asphalt, and increase the speed of the shearing machine. After the asphalt is completely added, continue to shear at high speed for 5 to 10 minutes to obtain a semi-finished high-viscosity and high-elasticity emulsified asphalt; 5) Add the semi-finished high-viscosity and high-elastic emulsified asphalt and the mother liquor into the colloid mill in turn, and shear for 1 minute to obtain the high-viscosity and high-elastic emulsified asphalt that can be stably stored.

8. The method for preparing a stably storable high-viscosity and high-elastic emulsified asphalt according to claim 7, characterized in that: In step 1), the heating temperature of the matrix asphalt is 170-180°C, the insulation development temperature is 170-180°C, and the time is 4 hours. In step 2), the adjustment temperature is 60-70°C, and the pH is adjusted to 1-3.

9. The method for preparing a stably storable high-viscosity and high-elastic emulsified asphalt according to claim 7, characterized in that: In step 4), the soap solution shear rate is 2000-3000 r / min, the heating temperature of the high-viscosity and high-elastic modified asphalt is 170-180° C., and the increased shear rate is 9000-11000 r / min.

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