Surface-treated high-viscosity emulsified modified asphalt and preparation method thereof

Abstract

The invention discloses surface-treated high-viscosity emulsified modified asphalt and a preparation method thereof. The surface-treated high-viscosity emulsified modified asphalt comprises the following components in percentage by weight: 62-70% of SBS / SIS (styrene butadiene styrene / styrene isoprene styrene) composite modified asphalt; 0.5%-1.5% of a super-viscous blender; 0.8%-1.5% of a compound emulsifier; 1%-2% of a stabilizer; 0.3%-0.5% of a thickening agent; 27 to 35 percent of water; the pH value is 1.2 to 3.0. The high-performance emulsified modified asphalt provided by the invention is excellent in pavement performance, solves the technical problems of poor bonding effect and poor low-temperature crack resistance of the emulsified asphalt commonly used at the present stage, can obviously improve the deformation resistance when being used for fine surface treatment and super surface treatment, and has a very good application prospect; the emulsified modified asphalt is extremely easy to prepare and produce, the emulsifying process is the same as that of common road petroleum asphalt, and the emulsifying effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field, and in particular to a surface-treated high-viscosity emulsified modified asphalt and a preparation method thereof. Background Art

[0002] At present, ordinary emulsified modified asphalt in highway construction often cannot meet the actual traffic and climate conditions, and its road performance is poor. When ordinary emulsified modified asphalt is used as fine surface treatment, super surface treatment and ultra-thin wear layer, it often flows when the spraying amount is large due to its low viscosity, so that the emulsified modified asphalt cannot or only enters a very small amount into the hot mix, resulting in poor sealing effect and serious road water seepage. Soon after the road is opened to traffic, pavement diseases such as shifting, peeling, potholes, and cracks will appear. Even if the viscosity of some emulsified modified asphalt meets the use requirements, the high temperature, low temperature, elastic recovery and other indicators of the modified asphalt after demulsification cannot meet the technical requirements of highway construction at this stage, and the above-mentioned pavement diseases will eventually appear.

[0003] As for the current application of emulsified modified asphalt, there are the following deficiencies: (1) Although the preparation process of SBR emulsified modified asphalt is relatively simple, SBR latex mainly improves the low-temperature performance of asphalt, and does not significantly improve the high-temperature performance of asphalt; (2) It is difficult to emulsify SBS modified asphalt with a dosage greater than 2%, and the prepared emulsified asphalt has poor storage stability and unsatisfactory actual road performance. Therefore, it is urgently needed to provide a surface-treated high-viscosity emulsified modified asphalt that can be sprayed on the road at a rate of 1.0L / m 2 There is no flow above, which significantly improves the interlayer adhesion of fine surface, super surface and ultra-thin wear layer, and improves road performance. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the problems existing in the above-mentioned existing surface-treated high-viscosity emulsified modified asphalt and its preparation method, the present invention is proposed.

[0006] Therefore, the purpose of the present invention is to provide a high-viscosity emulsified modified asphalt for surfacing and a preparation method thereof, which solves the technical problems of poor bonding effect and poor low-temperature crack resistance of the commonly used emulsified asphalt at this stage. It can be used for fine surfacing and super surfacing to significantly improve its ability to resist deformation, and has a good application prospect.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a surface-treated high-viscosity emulsified modified asphalt, the components and weight percentages of which are as follows:

[0008] SBS / SIS composite modified asphalt: 62%~70%;

[0009] Super-viscous blending agent: 0.5-1.5%;

[0010] Composite emulsifier: 0.8%~1.5%;

[0011] Stabilizer: 1%~2%;

[0012] Thickener: 0.3-0.5%;

[0013] Water: 27-35%;

[0014] PH value: 1.2~3.0.

[0015] As a preferred embodiment of the surface-treated high-viscosity emulsified modified asphalt described in the present invention, the ratio of SBS to SIS in the modified asphalt is 1:1, and the content accounts for 3% to 5% of the weight of the base asphalt (90# or 70# road petroleum asphalt), SBS is a linear SBS, and SIS is thermoplastic styrene-butadiene rubber.

[0016] As a preferred embodiment of the surface-treated high-viscosity emulsified modified asphalt described in the present invention, the super-viscous blending agent is prepared by compounding a grafted petroleum resin and a complex fatty acid (saturated fatty acid, monounsaturated fatty acid, polyunsaturated fatty acid) in a ratio of 1.5:0.5 through a high-speed mixer.

[0017] As a preferred solution of the surface-treated high-viscosity emulsified modified asphalt of the present invention, the composite emulsifier is prepared by compounding two emulsifiers, REDICOTE E-4819 from the Netherlands and INDULIN AA-63D from the United States, in a certain proportion.

[0018] As a preferred embodiment of the surface-treated high-viscosity emulsified modified asphalt of the present invention, the stabilizer is hexadecyltrimethylammonium bromide.

[0019] As a preferred embodiment of the surface-treated high-viscosity emulsified modified asphalt of the present invention, the thickener is hydroxymethyl cellulose.

[0020] A method for preparing a surface-treated high-viscosity emulsified modified asphalt comprises the following steps:

[0021] Step 1: Prepare modified asphalt: heat the base asphalt (90# or 70# road petroleum asphalt) to 175-180°C, then add 62%-70% SBS and SIS modifiers to evenly disperse them in the hot-melt 90# or 70# road petroleum asphalt, pass through an asphalt colloid mill, circulate shear for 20-40 minutes, and the shear rate is 3500 rpm to obtain modified asphalt; add 0.5-1.5% super-viscous blending agent to the modified asphalt, stir evenly, control the temperature at 150-170°C, and set aside;

[0022] Step 2: Prepare soap solution: add 0.8% to 1.5% of composite emulsifier, 1% to 2% of stabilizer and 0.3 to 0.5% of thickener into warm water at 40 to 50°C and stir evenly; add hydrochloric acid to the soap solution to control the pH value of the soap solution at 1.2 to 3.0, heat the soap solution to 50 to 60°C and set aside;

[0023] Step 3: The modified asphalt and soap solution prepared above are respectively transported to the colloid mill. After being evenly dispersed and ground by the colloid mill, they become water-in-oil emulsion. When the emulsion temperature drops below 90°C, emulsified modified asphalt is obtained.

[0024] Beneficial effects of the invention: The high-performance emulsified modified asphalt provided by the invention has excellent road performance, solves the technical problems of poor bonding effect and poor low-temperature crack resistance of the commonly used emulsified asphalt at this stage, and can significantly improve its ability to resist deformation when used for fine surface treatment and super surface treatment, and has a good application prospect. The emulsified modified asphalt is very easy to prepare and produce, and its emulsification process is the same as that of ordinary road petroleum asphalt, and the emulsification effect is good. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] The sources and specifications of the raw materials of the examples are shown in Table 1 below.

[0029] Table 1 Examples Sources and specifications of raw materials

[0030] Raw material name model factory SBS YH-791 Sinopec Baling Petrochemical Company SIS American Kraton D1161 Guangdong Dongbo Rubber & Plastic Co., Ltd. Grafted Petroleum Resin M－960 Wuxi Yiyuan New Materials Co., Ltd. Complex fatty acids HS-11 Shandong Haosuo Chemical Hydroxymethylcellulose WET-511 Shandong Haoshuo Chemical Hexadecyltrimethylammonium bromide RB-820 Deyang Rongxin Chemical Emulsifier E－4819 AkzoNobel of the Netherlands Emulsifier AA-63D MeadWestvaco Base asphalt Shuanglong 70# Tongsha Asphalt Plant

[0031] The present invention is further illustrated below in conjunction with an example of producing a surface-treated high-viscosity modified emulsified asphalt, but the scope of the present invention is not limited thereto.

[0032] Heat the base asphalt (Ssangyong 70# road petroleum asphalt) to 175-180°C, add 4% of the base asphalt by weight of SBS / SIS (1:1) modifier, evenly disperse it in the hot-melt base asphalt, and pass it through an asphalt colloid mill and cyclic shear for 20-40 minutes to obtain modified asphalt; add 1%-2.5% of the modified asphalt super-viscous blending agent (grafted petroleum resin and complex fatty acid), stir evenly, control the temperature at 160-170°C, and set aside.

[0033] Example 1

[0034] Based on the weight of emulsified modified asphalt, add 0.8% to 1.5% of emulsifier (the weight percentage of E-4819 and AA-63D is 50:50), 1% to 2% of stabilizer (cetyltrimethylammonium bromide) and 0.3% to 0.5% of thickener (hydroxymethyl cellulose) into warm water at 40 to 50°C (the order of adding admixtures does not affect the emulsification effect), and stir evenly; add hydrochloric acid to the prepared solution (soap solution) to control its pH value at 1.2 to 3.0, heat it to 50 to 60°C and set aside.

[0035] The modified asphalt and soap solution prepared above were transported to the colloid mill at a weight percentage of 65:35, and after being evenly dispersed and ground in the colloid mill, an emulsified modified asphalt was obtained. The properties thereof are shown in Table 2.

[0036] Example 2

[0037] Add 0.8% to 1.5% of the emulsifier (the weight percentage of E-4819 and AA-63D is 80:20) based on the weight of the emulsified modified asphalt, 1% to 2% of the stabilizer (cetyltrimethylammonium bromide) and 0.3% to 0.5% of the thickener (hydroxymethyl cellulose) into warm water at 40 to 50°C (the order of adding the additives does not affect the emulsification effect), and stir evenly; add hydrochloric acid to the prepared solution (soap solution) to control its pH value at 1.2 to 3.0, heat it to 50 to 60°C and set it aside.

[0038] The modified asphalt and soap solution prepared above were transported to the colloid mill at a mass percentage of 67:33, and after being evenly dispersed and ground in the colloid mill, an emulsified modified asphalt was obtained. The properties thereof are shown in Table 2.

[0039] Example 3

[0040] Add 0.8% to 1.5% of the emulsifier (the weight percentage of E-4819 and AA-63D is 85:15), 1% to 2% of the stabilizer (hexadecyl trimethyl ammonium bromide) and 0.3% to 0.5% of the thickener (hydroxymethyl cellulose) to warm water at 40 to 50°C (the order of adding the admixtures does not affect the emulsification effect), and stir evenly; add hydrochloric acid to the prepared solution (soap solution) to control its pH value at 1.2 to 3.0, heat it to 50 to 60°C, and set aside. The prepared modified asphalt and soap solution are transported to the colloid mill at a mass percentage of 69:31, and after uniform dispersion and grinding in the colloid mill, the emulsified modified asphalt is obtained. Its properties are shown in Table 2.

[0041] Table 2 Emulsified modified asphalt performance test results

[0042]

[0043]

[0044] Note: “%” in the table means mass percentage.

[0045] Among them, it can be seen from Table 2 that the viscosity of the emulsified modified asphalt at 25°C in Example 1, Example 2, and Example 3 is greater than 10, indicating that it has a large consistency and meets the technical requirements of ultra-thin wear layer adhesive oil; the residue on the sieve in Example 1, Example 2, and Example 3 is small, and the storage stability is good, indicating that the emulsification effect is good; the area covered with mineral materials in Example 1, Example 2, and Example 3 is greater than 2 / 3, indicating that the adhesion is good. The softening point of the evaporation residue in Example 1, Example 2, and Example 3 is above 80°C, the ductility at 5°C is greater than 45cm, and the elastic recovery is above 85%, indicating that it has met the requirements of super-surface treatment and binder, and it can be seen from the DSR and BBR indicators that the high-temperature stability and low-temperature ductility of the evaporation residue are good. In summary, the high-viscosity emulsified modified asphalt for surface treatment provided by the present invention is a high-quality material that can be used as fine surface treatment, super-surface treatment, and ultra-thin wear layer adhesive oil.

[0046] 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 preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A surface-treated high-viscosity emulsified modified asphalt, characterized in that: Its components and weight percentages are as follows: SBS / SIS composite modified asphalt: 62%~70%; Super-viscous blending agent: 0.5-1.5%; Composite emulsifier: 0.8%~1.5%; Stabilizer: 1%~2%; Thickener: 0.3-0.5%; Water: 27-35%; PH value: 1.2~3.

0.

2. The surface-treated high-viscosity emulsified modified asphalt according to claim 1, characterized in that: The ratio of SBS to SIS in the modified asphalt is 1:1, and the content accounts for 3% to 5% of the weight of the base asphalt (90# or 70# road petroleum asphalt). SBS is a kind of linear SBS, and SIS is thermoplastic styrene-butadiene rubber.

3. The surface-treated high-viscosity emulsified modified asphalt according to claim 2, characterized in that: The super-viscous blending agent is prepared by compounding a grafted petroleum resin and a composite fatty acid (saturated fatty acid, monounsaturated fatty acid, polyunsaturated fatty acid) in a ratio of 1.5:0.5 through a high-speed mixer.

4. The surface-treated high-viscosity emulsified modified asphalt according to claim 1, characterized in that: The composite emulsifier is prepared by compounding two emulsifiers, REDICOTEE-4819 from the Netherlands and INDULINA-63D from the United States, in a certain proportion.

5. The surface-treated high-viscosity emulsified modified asphalt according to claim 1, characterized in that: The stabilizer is hexadecyltrimethylammonium bromide.

6. The surface-treated high-viscosity emulsified modified asphalt according to claim 1, characterized in that: The thickener is hydroxymethyl cellulose.

7. A method for preparing a surface-treated high-viscosity emulsified modified asphalt, characterized in that: The following steps are involved: Step 1: Prepare modified asphalt: heat the base asphalt (90# or 70# road petroleum asphalt) to 175-180°C, then add 62%-70% SBS and SIS modifiers to evenly disperse them in the hot melt 90# or 70# road petroleum asphalt, pass through an asphalt colloid mill, circulate shear for 20-40 minutes, and the shear rate is 3500 rpm to obtain modified asphalt; Add 0.5-1.5% of super-viscous blending agent to the modified asphalt, stir evenly, control the temperature at 150-170°C, and set aside; Step 2: Prepare soap solution: add 0.8% to 1.5% of composite emulsifier, 1% to 2% of stabilizer and 0.3 to 0.5% of thickener into warm water at 40 to 50°C and stir evenly; add hydrochloric acid to the soap solution to control the pH value of the soap solution at 1.2 to 3.0, heat the soap solution to 50 to 60°C and set aside; Step 3: The modified asphalt and soap solution prepared above are respectively transported to the colloid mill. After being evenly dispersed and ground by the colloid mill, they become water-in-oil emulsion. When the emulsion temperature drops below 90°C, emulsified modified asphalt is obtained.

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