Emulsified asphalt penetrating oil and preparation method thereof

Abstract

The present invention relates to the technical field of pavement materials, and in particular to an emulsified asphalt penetration oil and a preparation method thereof. The raw materials for preparing the emulsified asphalt penetration oil include 41-45 parts of base asphalt, 8-10 parts of cycloalkyl rubber oil, 45-50 parts of water and 1-2 parts of anionic emulsifiers by weight. The emulsified asphalt penetration oil of the present invention is controlled within a reasonable range value according to the density of a semi-rigid base layer, and the raw material ratio of base asphalt, cycloalkyl rubber oil, water and anionic emulsifier is controlled to achieve better synergy between the components, thereby obtaining an emulsified asphalt penetration oil with good stability and good penetration effect, and reducing the particle size distribution according to the semi-rigid base layer porosity, achieving a doubling of the demulsification time at 90°C, and a penetration depth of more than 20 mm, so as to meet the requirements of the semi-rigid base layer. The production raw materials of the emulsified asphalt penetration oil of the present invention are green and environmentally friendly, and have high cost performance.

Description

Technical Field

[0001] The invention relates to the technical field of pavement materials, and in particular to an emulsified asphalt penetration oil and a preparation method thereof. Background Art

[0002] Penetration oil is a thin layer that penetrates a certain depth of the surface of the base layer by spraying liquid petroleum asphalt, emulsified asphalt, and kerosene asphalt on the base layer. The interlayer bonding strength between the base layer and the formed thin layer not only affects the bonding function between the layers and the drainage performance, but also significantly affects the overall structural performance and service life of the road surface. Insufficient interlayer bonding strength will cause early diseases such as potholes, sliding cracks, and water damage on the road surface, reducing the service life of the asphalt road surface.

[0003] At present, traditional interlayer bonding materials have deficiencies in construction and asphalt pavement service. The particle size distribution of the commonly used high-permeability emulsified asphalt in China is: 90%, <7.5μm. The semi-rigid base is very dense, and its porosity decreases as the service time increases. The traditional emulsified asphalt penetration oil has poor penetration effect due to its large particle size, insufficient penetration depth, poor interlayer bonding, and cannot meet the durability requirements of asphalt pavement. The demulsification timing and coagulation speed of emulsified asphalt penetration oil are of great significance to its permeability. After demulsification, the viscosity of emulsified asphalt is large, and premature demulsification and coagulation are prone to skinning, affecting its permeability. Due to the poor high-temperature stability of the current traditional emulsified asphalt penetration oil, it is difficult to accurately control the surface construction temperature during the penetration layer construction. The traditional emulsified asphalt penetration oil has poor stability at temperatures above 80°C, and will quickly demulsify and coagulate on the surface of the base, affecting the permeability. The development of high-temperature, slow-cracking, high-permeability emulsified asphalt for semi-rigid base layers is of great significance for enhancing the interlayer bonding performance between the semi-rigid base layer and the asphalt surface layer and extending the service life of the road surface. Summary of the invention

[0004] The invention provides an emulsified asphalt penetrating oil and a preparation method thereof, which are used to solve the problems of poor stability, easy demulsification and coagulation, poor penetration effect, etc. of the existing emulsified asphalt penetrating oil.

[0005] According to the first aspect of the present invention, the present invention provides an emulsified asphalt penetration oil, wherein the raw materials for preparation include, by weight: 41-45 parts of base asphalt, 8-10 parts of cycloalkyl rubber oil, 45-50 parts of water and 1-2 parts of anionic emulsifier.

[0006] In the above scheme, the emulsified asphalt penetration oil of the present invention comprises base asphalt, cycloalkyl rubber oil, water and anionic emulsifier. The present invention adopts cycloalkyl rubber oil as diluent, which is environmentally friendly and pollution-free compared with kerosene. At the same time, cycloalkyl rubber oil has the effect of viscosity enhancement and reinforcement. It can be used as an asphalt pavement regeneration agent to enhance the interlayer bonding effect and improve the interlayer bonding strength. The storage stability of cycloalkyl rubber oil is strong and non-volatile, which helps to enhance the high temperature stability of the emulsified asphalt penetration oil. The present invention adopts anionic emulsifier, which has the advantage of slow demulsification. High permeability emulsified asphalt is not easy to demulsify during high temperature construction. The emulsified asphalt penetration oil of the present invention is controlled within a reasonable range value according to the density of the semi-rigid base, so that the raw material ratio of base asphalt, cycloalkyl rubber oil, water and anionic emulsifier is better coordinated between the components, and the emulsified asphalt penetration oil with good stability and good penetration effect is obtained. According to the semi-rigid base porosity, the particle size distribution is reduced, and the demulsification time at 90°C is doubled, and the penetration depth reaches more than 20mm to meet the requirements of the semi-rigid base. The production raw materials of the emulsified asphalt penetration oil of the present invention are green and environmentally friendly and have high cost performance.

[0007] Further, in parts by weight, the prepared raw materials include: 41.5-43.5 parts of base asphalt, 8-10 parts of cycloalkyl rubber oil, 47-47.5 parts of water and 1-1.5 parts of anionic emulsifier; preferably, in parts by weight, the prepared raw materials include: 41.5 parts of base asphalt, 10 parts of cycloalkyl rubber oil, 47 parts of water and 1.5 parts of anionic emulsifier.

[0008] By controlling the raw material ratio of base asphalt, cycloalkyl rubber oil, water and anionic emulsifier within a better and more reasonable range, the components can work together better to obtain an emulsified asphalt penetration oil with better stability and better penetration effect.

[0009] Furthermore, the cycloalkyl rubber oil is prepared from cycloalkyl minus three-line distillate oil by a high-pressure hydrogenation process or is selected from Kemayi KN4006.

[0010] By selecting the right type of cycloalkyl rubber oil, it is helpful to enhance the high temperature stability of the emulsified asphalt penetration oil and improve the bonding strength of the interface.

[0011] Furthermore, the anionic emulsifier is selected from Solvay anionic emulsifier RHODAPEX CM 30, the main component of which is ethoxylated alkyl sulfate sodium salt.

[0012] By selecting the right type of anionic emulsifier, it is helpful to enhance the high temperature stability of emulsified asphalt penetration oil.

[0013] Furthermore, in the particle size distribution of the emulsified asphalt penetration oil, the volume fraction of particles with a size less than 2.5 μm is greater than 90%.

[0014] Emulsified asphalt penetration oil with such particle size distribution can better meet the requirements of semi-rigid base.

[0015] According to a second aspect of the present invention, the present invention also provides a method for preparing the above-mentioned emulsified asphalt penetration oil, comprising the following steps:

[0016] Mixing the base asphalt and the naphthenic rubber oil to obtain an asphalt mixture, and controlling the temperature to be between 135°C and 150°C;

[0017] Under the first stirring condition, an anionic emulsifier is added to water, and then an alkaline substance is added to adjust the pH value to 11-12 to obtain a soap solution (50-60° C.);

[0018] An asphalt mixture at a temperature of 135° C.-150° C. is added to the soap solution, and stirred for 0.5 h-1.5 h under the second stirring condition; after the stirring is completed, the material is discharged and stored; wherein, during the discharge process, pressure is prepared at the discharge port of the production equipment.

[0019] In the above scheme, the specified particle size distribution is achieved through the emulsification process conditions, and the demulsification timing is regulated according to the construction temperature and other conditions. During the discharge process of the emulsified asphalt permeable oil of the present invention, the preparation pressure is performed at the discharge port of the production equipment, which is beneficial to improve the dispersibility of the emulsified asphalt permeable oil and helps to improve its penetration ability.

[0020] Furthermore, the standby pressure is 0.1Mpa-0.5Mpa; during the discharging process, the discharging speed is controlled at 3-5t / h, preferably 4t / h.

[0021] In the above scheme, by reasonably controlling the standby pressure and the discharge speed, it is more conducive to improving the dispersibility of the emulsified asphalt penetration oil and its penetration ability.

[0022] Furthermore, the stirring speed of the second stirring is 200-300 r / s, preferably 250 r / s.

[0023] In the above scheme, by controlling the stirring speed of the second stirring within a reasonable range, it is beneficial to uniformly mix the base asphalt, cycloalkyl rubber oil, water and anionic emulsifier, thereby forming an emulsified asphalt penetration oil with better stability.

[0024] More preferably, during the second stirring process, the gap between the stator and the rotor of the motor is adjusted to 2.5 μm, which can effectively reduce the particle size of the finished high-permeability emulsified asphalt, so that 90% of the particles reach 2.5 μm.

[0025] Furthermore, the temperature of the obtained soap solution is 45° C.-55° C.; and / or the alkaline substance is flake caustic soda.

[0026] In the above scheme, the temperature of the soap solution is controlled within a reasonable range, which is beneficial to the stability of the soap solution.

[0027] Furthermore, the storage temperature is less than 60°C.

[0028] In the above scheme, by limiting the storage temperature to less than 60°C, it is beneficial to achieve the stability of the emulsified asphalt penetration oil.

[0029] The emulsified asphalt permeable oil provided by the present invention comprises base asphalt, cycloalkyl rubber oil, water and anionic emulsifier. According to the compactness of the semi-rigid base layer, the raw material ratio of base asphalt, cycloalkyl rubber oil, water and anionic emulsifier is controlled within a reasonable range value, so that the components can better cooperate with each other to obtain an emulsified asphalt permeable oil with good stability and good penetration effect. The particle size distribution is reduced according to the porosity of the semi-rigid base layer, and the demulsification time at 90°C is doubled, and the penetration depth reaches more than 20mm, so as to meet the requirements of the semi-rigid base layer. The production raw materials of the emulsified asphalt permeable oil of the present invention are green and environmentally friendly, and the cost performance is high. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The raw materials used in the following examples and comparative examples are as follows:

[0032] The base asphalt comes from No. 90 asphalt, and the cycloalkyl rubber oil is made from cycloalkyl minus three-line distillate oil through a high-pressure hydrogenation process or purchased as finished oil, such as Kemayi KN4006.

[0033] Example 1

[0034] This embodiment provides an emulsified asphalt penetration oil, which includes: 41.5 parts of base asphalt, 10 parts of naphthenic rubber oil, 47 parts of water and 1.5 parts of anionic emulsifier. The anionic emulsifier is specifically Solvay anionic emulsifier RHODAPEX CM30.

[0035] The preparation method of the above-mentioned emulsified asphalt penetrating oil comprises the following steps:

[0036] The base asphalt and the naphthenic rubber oil are mixed to obtain an asphalt mixture, and the temperature is controlled at 135°C-150°C.

[0037] Under the first stirring condition, an anionic emulsifier is added to water at a temperature of 50°C-60°C, and then flake caustic soda is added in small amounts and multiple times to adjust the pH value to 11-12 to obtain a soap solution at a temperature of 45°C-55°C.

[0038] Add the asphalt mixture at a temperature of 135℃-150℃ to the soap solution and stir for 1h under the second stirring condition; after stirring, discharge and store; during the discharge process, prepare the pressure at the discharge port of the production equipment. The pressure of the preparation pressure is 0.1Mpa-0.5Mpa; during the discharge process, the discharge speed is controlled at 4t / h. The storage temperature is less than 60℃.

[0039] The stirring speed of the second stirring is 250 r / s, and the gap between the stator and the rotor of the motor is adjusted to 2.5 μm.

[0040] Example 2

[0041] This embodiment provides an emulsified asphalt penetrating oil, which is different from the embodiment 1 in that:

[0042] It includes: 43.5 parts of base asphalt, 8 parts of naphthenic rubber oil, 47 parts of water and 1.5 parts of anionic emulsifier.

[0043] Example 3

[0044] This embodiment provides an emulsified asphalt penetrating oil, which is different from the embodiment 1 in that:

[0045] It includes: 41.5 parts of base asphalt, 10 parts of cycloalkyl rubber oil, 47.5 parts of water and 1 part of anionic emulsifier.

[0046] Example 4

[0047] This embodiment provides an emulsified asphalt penetration oil, which is different from Embodiment 1 in that the anionic emulsifier is sodium dodecyl sulfonate.

[0048] Comparative Example 1

[0049] This comparative example is an emulsified asphalt penetration oil provided by CN112239546A

[0050] It includes: 42 parts of petroleum asphalt, 2 parts of MQK-1M type cationic emulsifier, 40 parts of water, 15 parts of penetrating composite light component, and 1 part of CaCl2. The penetrating composite light component is a mixture of furfural oil and kerosene, with a mixing ratio of 1:1.

[0051] Comparative Example 2

[0052] The permeable oil provided in this comparative example is a high-permeability permeable oil for semi-rigid pavement base disclosed in CN108264773A, which specifically comprises: 50 parts of asphalt, 10 parts of kerosene, 2 parts of emulsifier, 2 parts of hydrochloric acid, and 36 parts of water. Preparation method: (1) heating the asphalt to 120-140°C; (2) mixing kerosene, emulsifier, hydrochloric acid and water, and heating to 50-70°C; (3) simultaneously passing the raw materials of (1) and (2) into a colloid mill for grinding to make the raw materials uniformly mixed.

[0053] Comparative Example 3

[0054] This comparative example provides an emulsified asphalt penetration oil, which is different from Example 1 in that:

[0055] In the preparation method of emulsified asphalt penetration oil, during the discharging process, no backup pressure is performed at the discharging port of the production equipment.

[0056] Comparative Example 4

[0057] This comparative example provides an emulsified asphalt penetration oil, which is different from Example 1 in that:

[0058] The anionic emulsifier is replaced by a cationic emulsifier, and the specific cationic emulsifier is a quaternary ammonium salt emulsifier.

[0059] The emulsified asphalt permeable oil obtained in Examples 1-4 and Comparative Examples 1-4 was subjected to performance testing, and the test method was as follows:

[0060] The particle size distribution test method is carried out using a laser particle size analyzer.

[0061] Penetration depth: Sprinkle high-permeability emulsified asphalt penetration oil on the cement-stabilized crushed stone semi-rigid base, the spreading temperature is: 90℃, the spreading amount is: 0.7L / m 2 , take a core sample with a diameter of 150mm 24 hours after spreading and measure the penetration depth.

[0062] Demulsification time at 90℃: Spread high-permeability emulsified asphalt penetration oil on the cement-stabilized crushed stone semi-rigid base, the spreading temperature is: 90℃, the spreading amount is: 0.7L / m 2 , start timing immediately after spreading is completed, observe the color change of the high-permeability penetrating oil with the naked eye, and stop timing after emulsification.

[0063] 5-day storage stability: refer to method T0655 in JTG E20-2011.

[0064] The test results are shown in Table 1.

[0065] Table 1 Emulsified asphalt penetration oil performance test results

[0066]

[0067] It can be seen from the experimental data in Table 1 that the emulsified asphalt penetration oil of the present invention has good stability and good penetration effect. It can be seen from the comparison results of Example 1 and Comparative Examples 1-2 that, compared with the prior art, the demulsification time at 90°C is doubled and the penetration depth reaches more than 20 mm. It can be seen from the comparison results of Example 1 and Comparative Example 3 that during the discharging process of the emulsified asphalt penetration oil of the present invention, by preparing the pressure at the discharge port of the production equipment, it is beneficial to improve the dispersibility of the emulsified asphalt penetration oil, which helps to improve its penetration ability and the stability of the emulsified asphalt penetration oil. It can be seen from the comparison results of Example 1 and Comparative Example 4 that the type of emulsifier in the emulsified asphalt penetration oil of the present invention is also very important. Compared with anionic emulsifiers, the use of cationic emulsifiers is more conducive to improving the stability and penetration effect of the emulsified asphalt penetration oil.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An emulsified asphalt penetrating oil, characterized in that: The raw materials are composed of the following components by weight: 41-45 parts of base asphalt, 8-10 parts of cycloalkyl rubber oil, 45-50 parts of water and 1-2 parts of anionic emulsifier; the base asphalt is derived from No. 90 asphalt; the anionic emulsifier is selected from Solvay anionic emulsifier RHODAPEX CM 30.

2. The emulsified asphalt penetrating oil according to claim 1, characterized in that: The raw materials are composed of the following components by weight: 41.5-43.5 parts of base asphalt, 8-10 parts of cycloalkyl rubber oil, 47-47.5 parts of water and 1-1.5 parts of anionic emulsifier.

3. The emulsified asphalt penetrating oil according to claim 2, characterized in that: The raw materials prepared consisted of the following components by weight: 41.5 parts of base asphalt, 10 parts of cycloalkyl rubber oil, 47 parts of water and 1.5 parts of anionic emulsifier.

4. The emulsified asphalt penetrating oil according to claim 1, characterized in that: The cycloalkyl rubber oil is prepared from cycloalkyl minus three-line distillate oil by high-pressure hydrogenation process or is selected from Kemayi KN4006.

5. The emulsified asphalt penetrating oil according to claim 1, characterized in that: In the particle size distribution of the emulsified asphalt penetration oil, the volume fraction of particles with a size less than 2.5 μm is greater than 90%.

6. The method for preparing the emulsified asphalt penetration oil according to any one of claims 1 to 5, characterized in that: The steps include: Mixing the base asphalt and the naphthenic rubber oil to obtain an asphalt mixture, and controlling the temperature to be between 135°C and 150°C; Under the first stirring condition, an anionic emulsifier is added to water, and then an alkaline substance is added to adjust the pH value to 11-12 to obtain a soap solution; An asphalt mixture at a temperature of 135° C.-150° C. is added to the soap solution, and stirred for 0.5 h-1.5 h under the second stirring condition; after the stirring is completed, the material is discharged and stored; wherein, during the discharge process, pressure is prepared at the discharge port of the production equipment.

7. The preparation method according to claim 6, characterized in that: The standby pressure is 0.1Mpa-0.5Mpa; during the discharging process, the discharging speed is controlled at 3-5t / h.

8. The preparation method according to claim 7, characterized in that: During the discharging process, the discharging speed is controlled at 4t / h.

9. The preparation method according to claim 6, characterized in that: The stirring speed of the second stirring is 200-300 r / s.

10. The preparation method according to claim 9, characterized in that: The stirring speed of the second stirring is 250 r / s.

11. The preparation method according to claim 9, characterized in that: During the second stirring process, the gap between the stator and the rotor of the motor was adjusted to 2.5 μm.

12. The preparation method according to claim 6, characterized in that: The temperature of the obtained soap solution is 45° C.-55° C.; and / or the alkaline substance is flake caustic soda.

13. The preparation method according to claim 6, characterized in that: The storage temperature is less than 60°C.

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