High-modulus and high-toughness asphalt modifier and preparation method thereof, and high-modulus modified asphalt based on modifier and preparation method thereof

Abstract

The invention discloses a high-modulus and high-toughness asphalt modifier, a preparation method thereof, high-modulus modified asphalt based on the modifier and a preparation method thereof. The modifier comprises desulfurized rubber tire powder, polyolefin plastic particles, petroleum resin and turbid liquid of graphene or a derivative thereof. The high-modulus modified asphalt comprises matrix asphalt, a modifier, sulfur, light oil and a stabilizer. The high-modulus and high-toughness modifier disclosed by the invention can effectively consider the high and low temperature performance of asphalt, so that the shear strength, modulus and rutting resistance of high-modulus modified asphalt prepared based on the high-modulus and high-toughness modifier can be improved, meanwhile, the low-temperature crack resistance is enhanced, and the high-modulus and high-toughness modifier is suitable for pavement paving under severe conditions such as high temperature and heavy load. And the high-modulus and high-toughness modifier uses the waste rubber tires and the polyolefin waste plastic particles as raw materials, so that the production cost is reduced, the cyclic utilization of resources is realized, and the high-modulus and high-toughness modifier has remarkable economic benefits and environmental protection significance. Besides, when the high-modulus and high-toughness modifier and the high-modulus modified asphalt are prepared, a double-screw extruder and a single-screw extruder are adopted for composite reaction and granulation, a high-speed dispersion machine is adopted for shear mixing, and the preparation process is simple and easy to operate.

Description

Technical Field

[0001] The present invention belongs to the field of high modulus modified asphalt, and in particular relates to a high modulus and high toughness asphalt modifier, a preparation method, and a high modulus modified asphalt based on the modifier, and a preparation method. Background Art

[0002] With the increase in road traffic, higher requirements are placed on the bearing capacity and durability of asphalt pavements. Traditional asphalt is prone to permanent deformation under harsh conditions such as high temperature and heavy load, resulting in reduced pavement smoothness and cracks. Therefore, it is of great significance to develop high modulus asphalt modifiers and high modulus modified asphalt with excellent anti-segregation performance and low-temperature crack resistance.

[0003] There are two types of high modulus modifiers on the market. One is asphalt-based materials, which have limited effect on the high stability of asphalt and are used in large quantities. The other is polyolefin-based materials, which cannot take into account the low-temperature performance of asphalt.

[0004] Based on this, a high modulus and high toughness modifier is now studied to effectively balance the low temperature performance and anti-segregation performance of asphalt, thereby improving the service life of asphalt pavement. Summary of the invention

[0005] Purpose of the invention: The technical problem to be solved by the present invention is to provide a high modulus and high toughness modifier, which can effectively take into account the high and low temperature performance of asphalt, and thus can improve the shear strength, modulus and rutting resistance of the high modulus modified asphalt prepared based on the high modulus and high toughness modifier, while enhancing the low-temperature crack resistance and anti-segregation performance.

[0006] Technical solution: The high modulus and high toughness asphalt modifier of the present invention comprises the following raw materials by weight: 40-60 parts of desulfurized rubber tire powder, 30-60 parts of polyolefin plastic particles, 0-20 parts of petroleum resin and 5-15 parts of a suspension of graphene or its derivatives.

[0007] During the preparation process of high modulus asphalt, a large amount of substances that increase the modulus of the composite material are added, such as desulfurized rubber tire powder and polyolefin plastic particles. These substances are generally denser than asphalt and easily aggregate together, leading to serious segregation.

[0008] Based on this, the present invention adds a suspension of graphene or its derivatives when preparing a high modulus and high toughness asphalt modifier. On the one hand, the suspension of graphene or its derivatives can be uniformly mixed and granulated with other substances, and the cyclohexane oil or paraffin oil solvent used in the suspension of graphene or its derivatives can also be easily dispersed in the asphalt. On the other hand, the graphene or its derivatives in the suspension of graphene or its derivatives can react with the matrix asphalt, desulfurized rubber powder, petroleum resin dissolved substances in the matrix asphalt, etc. to form a relatively stable three-dimensional network structure, thereby improving the stability of the entire modified asphalt system, that is, effectively solving the segregation problem of the desulfurized rubber tire powder used, and indirectly alleviating the agglomeration problem of polyolefin waste plastic particles; in addition, the added graphene or its derivatives can improve the softening point, ductility and other main indicators of the asphalt, thereby further improving the modification effect of the high modulus modifier.

[0009] Furthermore, the desulfurization degree of the desulfurized rubber tire powder used in the high-modulus and high-toughness asphalt modifier is 40-90%.

[0010] Furthermore, the mesh size of the polyolefin plastic particles used in the high modulus and high toughness asphalt modifier is 30-60 meshes, and includes polyethylene particles and / or polypropylene particles.

[0011] Furthermore, the petroleum resin used in the high-modulus and high-toughness asphalt modifier is aliphatic resin, alicyclic resin, aromatic resin, aliphatic / aromatic copolymer resin or hydrogenated petroleum resin.

[0012] Furthermore, the solute of the suspension of graphene or its derivatives used in the high-modulus and high-toughness asphalt modifier is graphene or graphene oxide, and the solvent is cycloalkane oil or paraffin oil, and the concentration is less than 5%.

[0013] The method for preparing the above-mentioned high-modulus and high-toughness asphalt modifier of the present invention comprises the following steps: mixing desulfurized rubber tire powder, polyolefin plastic particles, petroleum resin and a suspension of graphene or its derivatives, blending them through a twin-screw extruder at 140-240°C, and granulating them through a single-screw extruder at a granulation temperature of 100-160°C.

[0014] The high modulus modified asphalt of the present invention comprises the following raw materials by weight: 70-100 parts of base asphalt, 10-20 parts of the high modulus and high toughness asphalt modifier according to claim 1, 3-8 parts of light oil and 0.1-0.6 parts of stabilizer; the light oil comprises tall oil, rubber operating oil, castor oil, furfural oil or vacuum residue oil.

[0015] The method for preparing the high modulus modified asphalt of the present invention comprises the following steps:

[0016] (1) heating the base asphalt to 160-180° C. in a fluid state, adding the high modulus and high toughness asphalt modifier and light oil as described in claim 1, and shearing for 20-40 minutes at a shear temperature of 160-190° C. and a shear speed of 3000-6000 r / min;

[0017] (2) Add a stabilizer, then stir and develop for 60-120 minutes at a stirring speed of 400-1000 r / min to obtain a uniform high modulus modified asphalt.

[0018] Beneficial effects: Compared with the prior art, the significant advantages of the present invention are: the high modulus and high toughness modifier can effectively take into account the high and low temperature performance of asphalt, thereby improving the shear strength, modulus and rutting resistance of the high modulus modified asphalt prepared based on the high modulus and high toughness modifier, while enhancing the low temperature crack resistance, and is suitable for road paving under harsh conditions such as high temperature and heavy load. And the high modulus and high toughness modifier uses waste rubber tires and polyolefin waste plastic particles as raw materials, which not only reduces the production cost, but also realizes the recycling of resources, and has significant economic benefits and environmental significance. In addition, when preparing the high modulus and high toughness modifier and the high modulus modified asphalt, the present invention adopts a twin-screw extruder and a single-screw extruder for blending, compounding and granulation, and a high-speed disperser for shear mixing, and the preparation process is simple and easy to operate. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described in detail below in conjunction with embodiments.

[0020] It should be noted that the raw materials used in the present invention are all well-known raw materials in the art and can be directly purchased from the market.

[0021] Example 1

[0022] The components and contents of the high modulus and high toughness asphalt modifier of Example 1 are shown in Table 1 below.

[0023] Table 1 Component content of high modulus and high toughness asphalt modifier of Example 1

[0024]

[0025] The preparation method of the high modulus and high toughness asphalt modifier of this embodiment 1 includes the following steps: mixing desulfurized rubber tire powder, polyethylene particles, aliphatic petroleum resin and graphene oxide suspension, performing a compound reaction through a twin-screw extruder at a reaction temperature of 180°C, and then granulating through a single-screw extruder at a granulation temperature of 140°C.

[0026] The high modulus modified asphalt prepared in Example 1 based on the above-mentioned high modulus and high toughness asphalt modifier has component contents as shown in Table 2 below.

[0027] Table 2 Content of high modulus modified asphalt components in Example 1

[0028]

[0029]

[0030] The high modulus modified asphalt of Example 1 is prepared by the following steps:

[0031] (1) The base asphalt is heated to 170°C until it is in a fluid state; then the prepared high modulus and high toughness asphalt modifier and tall oil are added, and shear mixing is performed using a high-speed disperser, the shear temperature is 175°C, the shear time is 30 minutes, and the shear speed is 4500 r / min;

[0032] (2) After the shearing is completed, sulfur is added for stirring and development. The stirring time is 90 minutes and the stirring speed is 600 r / min until a uniform high modulus modified asphalt is obtained.

[0033] Example 2

[0034] The components and contents of the high modulus and high toughness asphalt modifier of Example 2 are shown in Table 3 below.

[0035] Table 3 Component content of high modulus and high toughness asphalt modifier of Example 2

[0036]

[0037] The preparation method of the high modulus and high toughness asphalt modifier of this embodiment 2 includes the following steps: mixing desulfurized rubber tire powder, polypropylene particles, aromatic petroleum resin and graphene oxide suspension, performing a composite reaction through a twin-screw extruder at a reaction temperature of 200°C, and then granulating through a single-screw extruder at a granulation temperature of 120°C.

[0038] This Example 2 is based on the high modulus modified asphalt prepared by the above-mentioned high modulus and high toughness asphalt modifier, and its component contents are shown in Table 4 below.

[0039] Table 4 Content of high modulus modified asphalt components in Example 2

[0040]

[0041]

[0042] The high modulus modified asphalt of Example 2 is prepared by the following steps:

[0043] (1) heating the base asphalt to 165° C. until it is in a fluid state; then adding the prepared high modulus and high toughness asphalt modifier and furfural oil, and using a high-speed disperser for shear mixing, the shear temperature is 170° C., the shear time is 30 min, and the shear speed is 5000 r / min;

[0044] (2) After the shearing is completed, sulfur is added for stirring and development. The stirring time is 75 minutes and the stirring speed is 800 r / min until a uniform high modulus modified asphalt is obtained.

[0045] Example 3

[0046] The components and contents of the high modulus and high toughness asphalt modifier of Example 3 are shown in Table 5 below.

[0047] Table 5 Component contents of high modulus and high toughness asphalt modifier of Example 3

[0048]

[0049] The preparation method of the high modulus and high toughness asphalt modifier of this embodiment 3 includes the following steps: mixing the desulfurized rubber tire powder, polypropylene particles and graphene oxide suspension, performing a composite reaction through a twin-screw extruder at a reaction temperature of 140°C, and then granulating through a single-screw extruder at a granulation temperature of 100°C.

[0050] This Example 3 is based on the high modulus modified asphalt prepared by the above-mentioned high modulus and high toughness asphalt modifier, and its component contents are shown in Table 6 below.

[0051] Table 6 Content of high modulus modified asphalt components in Example 3

[0052]

[0053]

[0054] The high modulus modified asphalt of Example 3 is prepared by the following steps:

[0055] (1) heating the base asphalt to 160° C. until it is in a fluid state; then adding the prepared high modulus and high toughness asphalt modifier and tall oil, and using a high-speed disperser for shear mixing, the shear temperature is 160° C., the shear time is 40 min, and the shear speed is 6000 r / min;

[0056] (2) After the shearing is completed, sulfur is added for stirring and development. The stirring time is 60 minutes and the stirring speed is 1000 r / min until a uniform high modulus modified asphalt is obtained.

[0057] Example 4

[0058] The components and contents of the high modulus and high toughness asphalt modifier of Example 4 are shown in Table 7 below.

[0059] Table 7 Component content of high modulus and high toughness asphalt modifier of Example 4

[0060]

[0061] The preparation method of the high modulus and high toughness asphalt modifier of this embodiment 3 includes the following steps: mixing desulfurized rubber tire powder, polypropylene particles, aliphatic petroleum resin (C5) and graphene oxide suspension, performing a compound reaction through a twin-screw extruder at a reaction temperature of 240°C, and then granulating through a single-screw extruder at a granulation temperature of 160°C.

[0062] This Example 4 is based on the high modulus modified asphalt prepared by the above-mentioned high modulus and high toughness asphalt modifier, and its component contents are shown in Table 8 below.

[0063] Table 8 High modulus modified asphalt component content of Example 4

[0064]

[0065]

[0066] The high modulus modified asphalt of Example 4 is prepared by the following steps:

[0067] (1) The base asphalt is heated to 180°C until it is in a fluid state; then the prepared high modulus and high toughness asphalt modifier and tall oil are added, and shear mixing is performed using a high-speed disperser, the shear temperature is 190°C, the shear time is 20 minutes, and the shear speed is 3000 r / min;

[0068] ()2 After the shearing is completed, sulfur is added for stirring and development. The stirring time is 120 minutes and the stirring speed is 400r / min until a uniform high modulus modified asphalt is obtained.

[0069] Comparative Example 1

[0070] The basic steps are the same as those in Example 1, except that graphene oxide is used instead of a graphene oxide suspension.

[0071] Comparative Example 2

[0072] The basic steps are the same as those in Example 1, except that no graphene oxide suspension is added.

[0073] Performance Testing

[0074] The high modulus modified asphalt prepared in the above Examples 1-4 and Comparative Examples 1-2 was subjected to performance testing, and the results obtained are shown in the following Table 9. It should be noted that the methods used in the present invention for various performance tests are all standardized methods in the art.

[0075] Table 9 Performance data of high modulus modified asphalt prepared in Examples 1-4 and Comparative Examples 1-2

[0076]

[0077] It can be seen from the softening point data of Examples 1 to 4 in Table 9 that the high modulus modified asphalt prepared by the present invention has strong high-temperature deformation resistance. Combined with its 5° elongation and storage stability data, it can be seen that the high modulus modified asphalt also has excellent low-temperature crack resistance and anti-segregation ability.

[0078] Combining Example 1 and Comparative Example 1, it can be seen that the use of graphene oxide suspension can effectively solve the segregation problem of the desulfurized rubber tire powder used, and indirectly alleviate the agglomeration problem of polyolefin waste plastic particles, thereby improving the low-temperature crack resistance and high-temperature stability of the prepared high modulus modified asphalt. In addition, combining Comparative Examples 1 and 2, it can be seen that the performance improvement of only using graphene oxide is not obvious compared to not adding graphene oxide suspension. This is because although graphene oxide is added, it is not easy to disperse itself, and it is still unable to fundamentally and effectively solve the segregation problem of desulfurized rubber tire powder and the agglomeration problem of polyolefin waste plastic particles, and thus the activity of both cannot be fully exerted, so that the performance of the prepared high modulus modified asphalt cannot be improved.

[0079] In addition to the above-mentioned embodiment 1, the high modulus and high toughness asphalt modifier and high modulus modified asphalt prepared by the raw material components and preparation process of the present invention can achieve the technical effects claimed by the present invention. For example, the polyolefin plastic particles used can also be polyethylene particles and polypropylene particles. The petroleum resin can also be alicyclic petroleum resin, aliphatic / aromatic copolymer petroleum resin or hydrogenated petroleum resin. The solute of the suspension of graphene or its derivatives used can also be graphene. The light oil can also include rubber operating oil, castor oil or vacuum residue oil, and the specific substances covered by the specific rubber operating oil or vacuum residue oil are also well-known and commonly used substances in the art.

Claims

1. A high modulus and high toughness asphalt modifier, characterized in that: The raw materials include the following by weight: 40-60 parts of devulcanized rubber tire powder, 30-60 parts of polyolefin plastic particles, 0-20 parts of petroleum resin and 5-15 parts of a suspension of graphene or its derivatives.

2. The high modulus and high toughness asphalt modifier according to claim 1, characterized in that: The desulfurization degree of the desulfurized rubber tire powder is 40-90%.

3. The high modulus and high toughness asphalt modifier according to claim 1, characterized in that: The mesh number of the polyolefin plastic particles is 30-60 meshes, and the polyolefin plastic particles include polyethylene particles and / or polypropylene particles.

4. The high modulus and high toughness asphalt modifier according to claim 1, characterized in that: The petroleum resin is an aliphatic petroleum resin, an alicyclic petroleum resin, an aromatic petroleum resin, an aliphatic / aromatic copolymer petroleum resin or a hydrogenated petroleum resin.

5. The high modulus and high toughness asphalt modifier according to claim 1, characterized in that: The solute of the suspension of graphene or its derivatives is graphene or graphene oxide, and the solvent is cycloalkane oil or paraffin oil, and the concentration is less than 5%.

6. A method for preparing the high modulus and high toughness asphalt modifier according to claim 1, characterized in that: The method comprises the following steps: mixing desulfurized rubber tire powder, polyolefin plastic particles, petroleum resin and a suspension of graphene or its derivatives, blending the mixture through a twin-screw extruder at 140-240° C., and granulating the mixture through a single-screw extruder at a granulation temperature of 100-160° C.

7. A high modulus modified asphalt, characterized in that: The raw materials include the following by weight: 70-100 parts of base asphalt, 10-20 parts of the high modulus and high toughness asphalt modifier according to claim 1, 3-8 parts of light oil and 0.1-0.6 parts of stabilizer; the light oil includes tall oil, rubber operating oil, castor oil, furfural oil or vacuum residue oil.

8. A method for preparing the high modulus modified asphalt according to claim 7, characterized in that: The steps include: (1) heating the base asphalt to 160-180° C. in a fluid state, adding the high modulus and high toughness asphalt modifier and light oil as described in claim 1, and shearing for 20-40 minutes at a shear temperature of 160-190° C. and a shear speed of 3000-6000 r / min; (2) Add a stabilizer, then stir and develop for 60-120 minutes at a stirring speed of 400-1000 r / min to obtain a uniform high modulus modified asphalt.

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