Direct vat set low-carbon asphalt and preparation method thereof

Abstract

The invention provides direct vat set low-carbon asphalt and a preparation method thereof. The direct vat set low-carbon asphalt comprises the following components in parts by mass: 55-75% of asphalt, 20-30% of an auxiliary material, 2-5% of a high-molecular polymer, 5-10% of a stabilizer and 0.1-0.2% of a grafting reactant, the preparation method comprises the following steps: mixing the asphalt and the auxiliary materials according to the mass fraction in an asphalt heating tank, heating to 170 DEG C, then adding the high-molecular polymer, heating to 175 DEG C, stirring and swelling for 10 minutes, grinding by a high-speed shearing grinder, then adding the grafting reactant, inoculating for 40-50 minutes, then adding the stabilizer, stirring for 30 minutes, cooling to 60-80 DEG C by a cooling device, and discharging to obtain the high-molecular polymer modified asphalt after the temperature of the asphalt is reduced to 60-80 DEG C, thereby obtaining the high-molecular polymer modified asphalt. And manufacturing the mixture into solid particles through a granulator to obtain the low-carbon asphalt. The low-carbon asphalt prepared by the invention can be transported and stored at normal temperature after being packaged, and can be directly added into asphalt mixture stirring equipment to be mixed with high-temperature stones to prepare an asphalt mixture meeting requirements, so that the use cost of a traditional asphalt material is reduced, and the production process of the asphalt mixture is changed.

Description

Technical Field

[0001] The present invention relates to the technical field of transportation highway municipal materials, and specifically relates to a direct-injection low-carbon asphalt and a preparation method thereof. Background Art

[0002] With the rapid economic development of the country and the concept of a powerful transportation country, with the construction of a large number of highways and urban roads, the demand for road asphalt is increasing. During the traditional transportation, storage, and use of asphalt, it must be kept in a high-temperature liquid state, resulting in energy waste, environmental pollution, and cost increase. If an asphalt material that can be transported, stored, and used at normal temperature can be researched and produced, it can effectively solve the energy consumption caused by the repeated heating and heat preservation of the original asphalt, and at the same time, the performance of the asphalt mixture also meets the national industry standards. Summary of the Invention

[0003] (I) Technical Problems to be Solved

[0004] In view of the deficiencies of the prior art, the present invention provides a direct-injection low-carbon asphalt and a preparation method thereof, solving the problems raised in the above background art.

[0005] (II) Technical Solutions

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0007] According to a first aspect of the present invention, there is provided a direct-injection low-carbon asphalt, comprising asphalt, auxiliary materials, a polymer, and a grafting reagent.

[0008] Preferably, by mass fraction, the direct-injection low-carbon asphalt comprises 55-75% of asphalt, 20-30% of auxiliary materials, 2-5% of a polymer, and 5-10% of a stabilizer, with 1.2-2‰ of a grafting reagent added externally.

[0009] Preferably, the asphalt is matrix asphalt.

[0010] Preferably, the polymer is a composite elastomeric material.

[0011] Preferably, the grafting reagent is selected from LT asphalt additives.

[0012] Preferably, the stabilizer is selected from LT-1 type composite stabilizers.

[0013] Preferably, the auxiliary materials are selected from rock asphalt.

[0014] According to a second aspect of the present invention, there is provided a preparation method of a direct-injection low-carbon asphalt, comprising the following steps:

[0015] In the asphalt heating tank, asphalt and auxiliary materials are mixed according to mass fraction, heated to 170 °C, then a polymer is added, heated to 175 °C and stirred for swelling for 10 min. After grinding by a high-speed shearing grinder, a grafting reactant is added, incubated for 40 - 50 min, then a stabilizer is added and stirred for 30 min. When the temperature of the asphalt drops to 60 - 80 °C through a cooling device, solid particles are formed by a granulator to obtain low-carbon asphalt.

[0016] (III) Beneficial effects

[0017] (1) The present invention provides a direct-injection low-carbon asphalt and its preparation method, which can effectively reduce energy consumption, reduce the original production cost, has high economic added value, and its various indicators meet the enterprise standards, with a softening point ≥ 75%, penetration ≥ 15, and can be transported and stored at room temperature. Description of the drawings

[0018] Figure 1 It is a process flow chart of a preparation method of a direct-injection low-carbon asphalt of the present invention. Specific embodiments

[0019] In order to better illustrate and elaborate the content of the present invention, the following will be described in detail with specific embodiments.

[0020] Example 1

[0021] A preparation method of a direct-injection low-carbon asphalt, the process flow is as Figure 1 shown:

[0022] 60% of asphalt and 28% of auxiliary materials are mixed and added to a grinder, heated to 170 °C, then 4% of a polymer is added, swollen for 15 min, ground by the grinder and heated to 180 °C, then 1.2‰ of LT asphalt additive is added externally, and finally 8% of LT-1 type composite stabilizer is added, stirred for 30 min to obtain a low-carbon asphalt matrix material, and then through a cooling granulator for wire drawing, cooling, shaping, and shearing to obtain low-carbon asphalt.

[0023] Example 2

[0024] A preparation method of a direct-injection low-carbon asphalt, including the following steps:

[0025] 71% of asphalt and 20% of auxiliary materials are mixed and added to a grinder, heated to 170 °C, then 4.5% of a polymer is added, swollen for 15 min, continuously ground in three stages and heated to 175 °C, then 2‰ of LT asphalt additive is added externally, and finally 4.5% of LT-1 type composite stabilizer is added, stirred for 30 min to obtain a low-carbon asphalt matrix material, and then through cooling, a pellet granulator, low-temperature wire drawing, cooling, shaping, and shearing to obtain low-carbon asphalt.

[0026] The penetration and softening point of the low-carbon asphalt prepared in Example 1 and Example 2 are shown in Table 1 as follows:

[0027] Table 1

[0028] Example Penetration at 25°C (0.1 mm) Softening point (°C) Example 1 21 70 Example 2 19 75

[0029] Using the low-carbon asphalt mixture with an asphalt-aggregate ratio of 5.4%, rutting tests and Cantabro abrasion tests are respectively carried out to test the stability and flow value, and the performance indexes are shown in Table 2 as follows:

[0030] Table 2

[0031]

[0032] From the data in Table 1 and Table 2, it can be seen that all the indexes of the directly-injected low-carbon asphalt prepared by the present invention meet the technical requirements.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A direct-cast low-carbon asphalt, characterized in that: It includes asphalt, auxiliary materials, high molecular polymer, stabilizer and grafting reaction agent.

2. A direct-cast low-carbon asphalt according to claim 1, characterized in that: Calculated by mass fraction, it includes 55-75% asphalt, 20-30% auxiliary materials, 2-5% high molecular polymer, 5-10% stabilizer, and 1-2‰ grafting reaction agent.

3. A method for preparing direct-cast low-carbon asphalt according to claim 1 or 2, characterized in that: The following steps are involved: In the asphalt heating tank, the asphalt and auxiliary materials are mixed according to the mass fraction, the temperature is raised to 170°C, the high molecular polymer is added, the temperature is heated to 175°C, and the mixture is stirred and swelled for 10 minutes. After grinding in a high-speed shear grinder, the grafting reactant is added, incubated for 40 to 50 minutes, and then the stabilizer is added and stirred for 30 minutes. When the asphalt temperature drops to 60 to 80°C through a cooling device, solid particles are formed through a granulator to obtain low-carbon asphalt.

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