Environment-friendly rubber modified asphalt as well as preparation method and application thereof

Abstract

The invention relates to the technical field of road materials, in particular to environment-friendly rubber modified asphalt as well as a preparation method and application thereof. The environment-friendly rubber modified asphalt is prepared from the following components in parts by mass: 100 parts of matrix asphalt; 1-5 parts of softening oil; the softening oil comprises aromatic oil, oleic acid, furfural extract oil and wax oil; 15 to 30 parts of micro-nano rubber particles; the micro-nano rubber particles are obtained from desulfurized and activated reclaimed rubber; 0.1 to 0.3 part of a stabilizing agent; and 0-3 parts of a high-molecular polymer. Compared with common rubber modified asphalt, the environment-friendly rubber modified asphalt disclosed by the invention has higher viscosity, excellent low-temperature performance and high-temperature performance, a stable system and environment-friendly construction environment, and the odor in the construction process is greatly reduced. The environment-friendly rubber asphalt is prepared by adopting an environment-friendly rubber particle wet method, the preparation process is simple, high-standard modified asphalt can be obtained through one-time feeding and a colloid mill, and the production cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of road materials, in particular to environmentally friendly rubber modified asphalt and a preparation method and application thereof. Background Art

[0002] With the rapid development of the transportation industry, the use of rubber tires has continued to increase, and the random disposal of waste tires has aggravated environmental pollution and the shortage of rubber resources. How to recycle waste tires is an important issue that needs to be solved urgently. The rubber powder industry is an important way to comprehensively utilize waste rubber, and the application of rubber powder in road engineering has received widespread attention. However, rubber asphalt still has problems such as unstable quality and poor storage stability during processing and use. Producing rubber asphalt with good uniformity and stability to improve the use efficiency of rubber asphalt is the focus of current research on rubber asphalt.

[0003] On the one hand, the existing production process of rubber powder asphalt is not friendly to the environment, and the construction odor is strong, which makes it impossible to popularize it on a large scale. On the other hand, the existing rubber powder asphalt is prone to poor adhesion due to the uneven dispersion of PE materials during the production process; for example, the invention patent CN1831043A discloses a method for preparing a composite modified asphalt mixture by combining dry and wet methods. The method is to add 10-23% tire rubber powder to 77%-90% petroleum asphalt to prepare rubber asphalt, then heat 100 parts of mineral aggregate to 160-200°C, add 0.2-0.8 parts of PE to the mineral aggregate, and then add 6.5-11 parts by mass of the prepared rubber asphalt, which can avoid the segregation of rubber modified asphalt, but PE is directly added to the aggregate, which is prone to uneven dispersion and poor local adhesion. Summary of the invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide an environmentally friendly rubber modified asphalt and a preparation method and application thereof. The low-carbon environmentally friendly asphalt provided by the present invention has excellent low-temperature performance and high-temperature performance, and the system is stable; it has little odor during the construction process.

[0005] The present invention provides an environmentally friendly rubber modified asphalt, which is prepared from the following components in parts by weight:

[0006] 100 parts of base asphalt;

[0007] 1 to 5 parts of softened oil; the softened oil includes aromatic oil, oleic acid, furfural extracted oil and wax oil;

[0008] 15 to 30 parts of micro-nano rubber particles; the micro-nano rubber particles are obtained from desulfurized activated reclaimed rubber;

[0009] 0.1 to 0.3 parts of stabilizer;

[0010] 0 to 3 parts of high molecular weight polymer.

[0011] Preferably, the environmentally friendly rubber modified asphalt is prepared from the following components in parts by weight:

[0012] 100 parts of base asphalt;

[0013] 1-2 parts of softening oil;

[0014] 15 to 30 parts of micro-nano rubber particles;

[0015] 0.25-0.3 parts of stabilizer;

[0016] 1 to 3 parts of high molecular polymer.

[0017] The softening oil of the present invention comprises aromatic oil, oleic acid, furfural extracted oil and wax oil in a mass ratio of (68-72): (2.5-3.5): (11-13): (14-16), preferably comprising aromatic oil, oleic acid, furfural extracted oil and wax oil in a mass ratio of 70:3:12:15; wherein the aromatic fraction in the aromatic oil is 50%-65%, and the saturated fraction is 10%-25%; the wax oil is vacuum second-line oil and vacuum third-line oil. The softening oil of the present invention is made by mixing aromatic oil, oleic acid, furfural extracted oil and wax oil in a uniform proportion according to the principle of similar dissolution.

[0018] The micro-nano rubber particles of the present invention are obtained from desulfurized activated reclaimed rubber, have low odor, and have better low temperature performance. Specifically, the particles are prepared by the following method: the waste tire rubber powder is subjected to microwave pre-desulfurization treatment; the waste tire rubber powder after microwave pre-desulfurization treatment is subjected to melt extrusion desulfurization reaction together with a desulfurization aid and rubber oil to obtain micro-nano rubber particles. More specifically, the waste tire rubber powder is subjected to microwave pre-desulfurization treatment; the waste tire rubber powder after microwave pre-desulfurization treatment is stirred and mixed evenly with a desulfurization aid and rubber oil, and then melt extrusion desulfurization reaction is carried out together through a twin-screw extruder, and the extrudate obtained is desulfurized activated reclaimed rubber, which is further water-cooled and pelletized to obtain micro-nano rubber particles. The temperature of the melt extrusion desulfurization reaction of the present invention is 180°C to 190°C; the melt extrusion desulfurization reaction is carried out by screw extrusion, and the speed of the screw is 88r / min to 112r / min.

[0019] The penetration of the base asphalt of the present invention is 60 dmm to 80 dmm. In certain embodiments of the present invention, the base asphalt is selected from 70# road petroleum asphalt (70# is based on the penetration grading system, with a penetration of 60 dmm to 80 dmm).

[0020] The main component of the stabilizer of the present invention is sulfur; the main function of the stabilizer of the present invention is to form a network structure in the asphalt to increase the thermal stability and toughness of the asphalt.

[0021] The high molecular polymer of the present invention can be selectively added or not added, and is selected from one or more of styrene-butadiene-styrene triblock copolymers, styrene-butadiene rubber and natural rubber, preferably selected from styrene-butadiene-styrene triblock copolymers (SBS), and more preferably selected from linear styrene-butadiene-styrene triblock copolymers.

[0022] The environmentally friendly rubber asphalt provided by the present invention has good stability. The softening oil in the formula not only plays the role of solubilizing asphalt, but also improves the odor of traditional rubber modified asphalt, reduces product costs, and improves the comprehensive performance of rubber asphalt through the softening oil and micro-nano rubber particles in the formula in coordination with other components. Specifically, the high and low temperature performance of traditional rubber modified asphalt is improved, and it has excellent high and low temperature performance, especially the low temperature brittle point is above -25°C.

[0023] The present invention also provides a method for preparing the environmentally friendly rubber modified asphalt described in any of the above technical solutions, comprising the following steps: mixing and stirring the base asphalt, softening oil, micro-nano rubber particles and an optional high molecular polymer, grinding them with a colloid mill, and then adding a stabilizer for stirring and developing to obtain the environmentally friendly rubber modified asphalt.

[0024] Specifically, the base asphalt is first heated to 160°C to 170°C, and then softening oil is added and stirred to obtain mixture A; micro-nano rubber particles are added to the mixture A, stirred and swollen to obtain mixture B; optional high molecular polymers are added to the mixture B, stirred evenly, stirred and heated to 175°C to 185°C, and colloid milled to obtain mixture C; stabilizers are added to the mixture C for stirring and development to obtain environmentally friendly rubber modified asphalt. The stirring and development temperature of the present invention is 180°C to 185°C, preferably 183°C; the stirring and development time is 5h to 10h, and the stirring rate of the stirring and development is 400r / min to 600r / min. The base asphalt, softening oil, micro-nano rubber particles and high molecular polymers of the present invention are the same as above and will not be repeated.

[0025] The present invention also provides the use of the environmentally friendly rubber modified asphalt described in any of the above technical solutions or the environmentally friendly rubber modified asphalt obtained by the preparation method of the environmentally friendly rubber modified asphalt described in any of the above technical solutions as a road construction material.

[0026] The present invention provides an environmentally friendly rubber modified asphalt and a preparation method and application thereof. The environmentally friendly rubber modified asphalt of the present invention is prepared from the following components by mass: 100 parts of base asphalt; 1 to 5 parts of softening oil; the softening oil includes aromatic oil, oleic acid, furfural extracted oil and wax oil; 15 to 30 parts of micro-nano rubber particles; the micro-nano rubber particles are obtained from desulfurized activated reclaimed rubber; 0.1 to 0.3 parts of stabilizer; 0 to 3 parts of high molecular polymer. Compared with ordinary rubber modified asphalt, the environmentally friendly rubber modified asphalt of the present invention has higher viscosity, excellent low temperature performance and high temperature performance, which ensures that the road surface after application has good high and low temperature performance, the system is stable, the odor during construction is greatly reduced, and the construction environment is friendly. This paper adopts the environmentally friendly rubber particle wet method to prepare environmentally friendly rubber asphalt, that is, it can be mass-produced by conventional modified asphalt production process, the preparation process is simple, and high-standard modified asphalt can be obtained by one-time feeding and colloid milling, saving production costs. DETAILED DESCRIPTION

[0027] The present invention discloses an environmentally friendly rubber-modified asphalt and a preparation method and application thereof. Those skilled in the art can refer to the content of this article and appropriately improve the process parameters to achieve the same. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are deemed to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the method and application of this article without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0028] In the environmentally friendly rubber modified asphalt prepared in the specific embodiment of the present invention, the base asphalt is base asphalt 70#;

[0029] The high molecular polymer is a styrene-butadiene-styrene triblock copolymer (SBS);

[0030] The softened oil is aromatic oil, oleic acid, furfural extracted oil and wax oil in a mass ratio of 70:3:12:15; the aromatic oil has an aromatic content of 50% to 65% and a saturated content of 10% to 25%; the wax oil is vacuum second-line oil and vacuum third-line oil. According to the principle of like dissolves like, aromatic oil, oleic acid, furfural extracted oil and wax oil are mixed evenly in proportion to prepare;

[0031] The micro-nano rubber particles are rubber particles made from desulfurized activated recycled rubber, which have low odor and better low-temperature performance. The preparation method is as follows: spread the waste tire rubber powder on a microwave porcelain plate, place the porcelain plate in a microwave reactor for microwave pre-desulfurization treatment; stir and mix the microwave-treated waste tire rubber powder with a desulfurization aid and rubber oil, and then add them to a twin-screw extruder for melt extrusion desulfurization reaction. The extrudate is water-cooled and pelletized to obtain desulfurized rubber powder particles, and the rubber powder is desulfurized by screw extrusion, the desulfurization temperature is 185°C, and the screw speed is 100r / min.

[0032] The stabilizer, whose main component is sulfur, mainly forms a network structure in the asphalt to increase the thermal stability and toughness of the asphalt.

[0033] The present invention will be further described below in conjunction with embodiments:

[0034] Example 1

[0035] Step 1: Heat the base asphalt 70# to 165°C, then add 2% softening oil and stir evenly;

[0036] Step 2: Add 20% of micro-nano rubber particles and stir evenly, then add 2% of SBS, stir evenly, and continue to heat to 180°C for colloid mill grinding;

[0037] Step 3: After grinding, add 0.3% stabilizer and develop to obtain environmentally friendly rubber modified asphalt; the development temperature is 183°C, the development time is 8h, and the stirring speed is 450r / min.

[0038] Comparative Example 1

[0039] Step 1: Heat the base asphalt 70# to 165℃, add 20% 40 mesh vulcanized rubber powder, stir evenly, and continue to heat to 180℃ for colloid mill grinding;

[0040] Step 2: After grinding, add 0.3% stabilizer and develop to obtain asphalt; the development temperature is 183°C, the development time is 8h, and the stirring speed is 450r / min.

[0041] Example 2

[0042] Step 1: Heat the base asphalt 70# to 165°C, then add 1.5% softening oil and stir evenly;

[0043] Step 2: Add 15% of micro-nano rubber particles and stir evenly, then add 3% of SBS, stir evenly, and continue to heat to 180°C for colloid mill grinding;

[0044] Step 3: After grinding, add 0.25% stabilizer and develop to obtain environmentally friendly rubber modified asphalt; the development temperature is 183°C, the development time is 8h, and the stirring speed is 450r / min.

[0045] Example 3

[0046] Step 1: Heat the base asphalt 70# to 165°C, then add 2% softening oil and stir evenly;

[0047] Step 2: Add 30% of micro-nano rubber particles and stir evenly, then add 1% SBS, stir evenly, and continue to heat to 180°C for colloid mill grinding;

[0048] Step 3: After grinding, add 0.25% stabilizer and develop to obtain environmentally friendly rubber modified asphalt; the development temperature is 183°C, the development time is 8h, and the stirring speed is 450r / min.

[0049] Comparative Example 2

[0050] Step 1: Heat the base asphalt 70# to 165°C, then add 1.5% solvent (common modified asphalt solvent purchased from the market) and stir evenly;

[0051] Step 2: Add 15% of micro-nano rubber particles and stir evenly, then add 3% of SBS, stir evenly, and continue to heat to 180°C for colloid mill grinding;

[0052] Step 3: After grinding, add 0.25% stabilizer and develop to obtain environmentally friendly rubber modified asphalt; the development temperature is 183°C, the development time is 8h, and the stirring speed is 450r / min.

[0053] The asphalt indicators prepared in the above examples and comparative examples are shown in Table 1:

[0054] Table 1

[0055]

[0056] As can be seen from Table 1, the rubber modified asphalt of the present invention has excellent high temperature performance and low temperature crack resistance compared with ordinary rubber modified asphalt, and the preparation process is simple. The conventional modified asphalt production process is adopted, and the rubber modified asphalt can be obtained by one-time feeding and grinding with a colloid mill. The environmental protection index detection shows that the release of harmful gases is reduced, and the paving odor is reduced during the road paving process.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An environmentally friendly rubber modified asphalt, characterized in that: It is prepared from the following components in parts by weight: 100 parts of base asphalt; 1 to 5 parts of softened oil; the softened oil includes aromatic oil, oleic acid, furfural extracted oil and wax oil; 15 to 30 parts of micro-nano rubber particles; the micro-nano rubber particles are obtained from desulfurized activated reclaimed rubber; 0.1 to 0.3 parts of stabilizer; 0 to 3 parts of high molecular weight polymer.

2. The environmentally friendly rubber modified asphalt according to claim 1, characterized in that: It is prepared from the following components in parts by weight: 100 parts of base asphalt; 1-2 parts of softening oil; 15 to 30 parts of micro-nano rubber particles; 0.25-0.3 parts of stabilizer; 1 to 3 parts of high molecular polymer.

3. The environmentally friendly rubber modified asphalt according to claim 1 or 2, characterized in that: The softened oil comprises aromatic oil, oleic acid, furfural extracted oil and wax oil in a mass ratio of (68-72):(2.5-3.5):(11-13):(14-16).

4. The environmentally friendly rubber modified asphalt according to claim 3, characterized in that: The aromatic fraction of the aromatic oil is 50% to 65%, and the saturated fraction is 10% to 25%; The wax oil includes asphalt vacuum second-line oil and asphalt vacuum third-line oil.

5. The environmentally friendly rubber modified asphalt according to claim 1 or 2, characterized in that: The micro-nano rubber particles are prepared by the following method: The waste tire rubber powder is subjected to microwave pre-desulfurization treatment; the waste tire rubber powder subjected to microwave pre-desulfurization treatment is subjected to melt extrusion desulfurization reaction together with a desulfurization aid and rubber oil to obtain desulfurized rubber powder particles.

6. The environmentally friendly rubber modified asphalt according to claim 5, characterized in that: The temperature of the melt extrusion desulfurization reaction is 180°C to 190°C; The melt extrusion desulfurization reaction is carried out by screw extrusion, and the rotation speed of the screw is 88r / min to 112r / min.

7. The environmentally friendly rubber modified asphalt according to claim 1 or 2, characterized in that: The needle penetration of the matrix asphalt is 60dmm to 80dmm; The stabilizer includes sulfur; The high molecular polymer is selected from one or more of styrene-butadiene-styrene triblock copolymer, styrene-butadiene rubber and natural rubber.

8. The method for preparing the environmentally friendly rubber modified asphalt according to any one of claims 1 to 7, characterized in that: The following steps are involved: The base asphalt, softening oil, micro-nano rubber particles and optional high molecular polymer are mixed and stirred, colloid milled, and then a stabilizer is added and stirred to obtain environmentally friendly rubber modified asphalt.

9. The preparation method according to claim 8, characterized in that: The stirring and developing temperature is 180° C. to 185° C., the stirring and developing time is 5 h to 10 h, and the stirring speed of the stirring and developing is 400 r / min to 600 r / min.

10. Use of the environmentally friendly rubber modified asphalt described in any one of claims 1 to 7 or the environmentally friendly rubber modified asphalt obtained by the preparation method of the environmentally friendly rubber modified asphalt described in any one of claims 1 to 7 as a road construction material.

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