Composition and method for preparing kerosene co-refining residue-based asphalt and kerosene co-refining residue-based asphalt

Abstract

The present invention relates to the technical field of modified asphalt, and discloses a composition and method for preparing kerosene co-refining residue-based asphalt and kerosene co-refining residue-based asphalt. The composition contains base asphalt, kerosene co-refining residue, rubber powder, thermoplastic elastomer SBS, solubilizer, and crosslinking agent; wherein the weight ratio of the base asphalt, the kerosene co-refining residue, the rubber powder, the thermoplastic elastomer SBS, the solubilizer, and the crosslinking agent is 100:20-50:5-15:2-8:5-15:0.1-0.5. The kerosene co-refining residue-based anti-rutting asphalt prepared by the composition provided by the present invention has excellent performance, can greatly improve the anti-rutting deformation performance and anti-cracking performance of asphalt mixture for road construction, and is economical and environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of modified asphalt, and in particular to a composition and method for preparing kerosene co-refining residue-based asphalt and the kerosene co-refining residue-based asphalt. Background Art

[0002] In recent years, with the growth of highway traffic in my country, the continuous impact of heavy loads on asphalt pavement has caused asphalt pavement to be prone to rutting, deformation and other diseases, which has greatly affected driving safety. Asphalt with strong anti-rutting performance is used in pavement construction to enhance the strength of the pavement structure and effectively solve the pavement rutting disease.

[0003] Kerosene co-refining residue is a low-value product produced in the process of kerosene co-refining. It has the characteristics of high carbon, high sulfur and high ash. After composition analysis, it is found that it contains more liquefied oil, asphaltene and other components. These macromolecular substances have polar functional groups of heteroatoms such as N and S, which have strong adsorption capacity for minerals, so that asphalt mixtures have stronger anti-stripping performance. Kerosene co-refining residue has the characteristic of high ash content: the ash is mainly composed of unconverted coal, generated coke, catalysts, minerals, etc. in the process of kerosene co-refining. These substances exist in the kerosene co-refining residue in the form of insoluble particles. How to achieve the rational utilization of kerosene co-refining residue is an urgent problem to be solved.

[0004] In road asphalt construction, anti-rutting agents are generally used to enhance the ability of asphalt pavement to resist deformation under heavy loads. Anti-rutting agents are generally made of a variety of polymer composites. They promote the interaction between asphalt and aggregate to enhance the high-temperature stability of the asphalt mixture, thereby achieving the purpose of anti-rutting. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem that kerosene co-refining residues are not reasonably utilized in the prior art and that anti-rutting agents are needed in road asphalt construction to enhance the ability of asphalt pavement to resist deformation under heavy loads, and to provide a composition and method for preparing kerosene co-refining residue-based asphalt and kerosene co-refining residue-based asphalt. The kerosene co-refining residue-based anti-rutting asphalt prepared by the composition provided by the present invention has excellent performance, can greatly improve the anti-rutting deformation performance and anti-cracking performance of asphalt mixtures for road construction, and is economical and environmentally friendly.

[0006] In order to achieve the above-mentioned object, the first aspect of the present invention provides a composition for preparing kerosene co-refining residue-based asphalt, the composition comprising base asphalt, kerosene co-refining residue, rubber powder, thermoplastic elastomer SBS, solubilizer, and cross-linking agent;

[0007] The weight ratio of the base asphalt, the kerosene co-refining residue, the rubber powder, the thermoplastic elastomer SBS, the solubilizer and the cross-linking agent is 100:20-50:5-15:2-8:5-15:0.1-0.5.

[0008] Preferably, the softening point of the kerosene co-refining residue is 100-150°C;

[0009] Preferably, the content of tetrahydrofuran soluble matter in the kerosene co-refining residue is 60-70wt%, and the content of ash is 5-15wt%.

[0010] Preferably, the base asphalt has a needle penetration of 60 to 100 at 25°C and a depth of 0.1 mm.

[0011] Preferably, the particle size of the rubber powder is 0.18-0.38 mm.

[0012] Preferably, the thermoplastic elastomer SBS is a styrene-butadiene-styrene block copolymer, and the block ratio of the thermoplastic elastomer SBS is 30 / 70 or 40 / 60.

[0013] Preferably, the structure of the thermoplastic elastomer SBS is linear or star-shaped.

[0014] Preferably, the solubilizing agent is one or more of high aromatic oil, rubber oil and three-line extraction oil.

[0015] Preferably, the cross-linking agent is sulfur and / or a sulfur-containing compound.

[0016] The second aspect of the present invention provides a method for preparing kerosene co-refining residue-based asphalt, wherein the kerosene co-refining residue-based asphalt is prepared using the composition described above, and the method comprises the following steps:

[0017] (1) heating kerosene co-refining residue and base asphalt to a molten state;

[0018] (2) stirring the molten kerosene co-refining residue and the molten base asphalt at 120-170° C. for 10-20 minutes, then adding a solubilizer and stirring at 150-170° C. for 10-20 minutes, and then adding rubber powder and thermoplastic elastomer SBS in sequence and stirring at 170-190° C. for 20-60 minutes;

[0019] (3) shearing the mixture obtained in step (2) at 180-200° C. for 40-90 min;

[0020] (4) Mixing the mixture obtained in step (3) with a cross-linking agent and stirring at 180-200° C. for 60-180 min.

[0021] Preferably, in step (1), the temperature at which the kerosene co-refining residue is heated is 130-170°C.

[0022] Preferably, in step (1), the temperature at which the base asphalt is heated is 100-150°C.

[0023] Preferably, in step (2), the stirring rate is 400-1000 rpm.

[0024] Preferably, in step (3), the shearing rate is 3000-5000 rpm.

[0025] Preferably, in step (4), the stirring rate is 400-1000 rpm.

[0026] The third aspect of the present invention provides a kerosene co-refining residue-based asphalt prepared by the method described above.

[0027] Compared with the prior art, the present invention has at least the following advantages:

[0028] (1) The present invention prepares kerosene co-refining residue-based asphalt by combining base asphalt, kerosene co-refining residue, rubber powder, thermoplastic elastomer SBS, solubilizer, and cross-linking agent in a specific weight ratio, thereby obtaining a kerosene co-refining residue-based asphalt having excellent anti-rutting performance and can greatly improve the anti-rutting deformation performance and anti-cracking performance of asphalt mixture for road construction.

[0029] (2) In the present invention, after the kerosene co-refining residue is added to the asphalt, the ash, unreacted coal and minerals that are insoluble in the asphalt will adsorb the heavy components in the asphalt to form a "core-shell" structure, which takes into account both flexibility and rigidity, thereby achieving the purpose of anti-rutting.

[0030] (3) Although the ability of kerosene co-refining residue to resist deformation can be enhanced after being mixed with matrix asphalt, it will become brittle in a low-temperature environment. The use of rubber powder and thermoplastic elastomer SBS, which can enhance the toughness of asphalt, can be used to mix with the mixture of kerosene co-refining residue and matrix asphalt to form a network structure or a continuous phase structure of polymer inside, thereby improving the low-temperature toughness of the mixture of kerosene co-refining residue and matrix asphalt.

[0031] (4) Kerosene co-refining residue is cheaper than existing anti-rutting agents and can significantly reduce the use of polymers in asphalt modification. The resulting kerosene co-refining residue-based anti-rutting asphalt is economical. At the same time, the use of kerosene co-refining residue in the field of road asphalt modification realizes the recycling of waste and is environmentally friendly.

[0032] (5) The preparation method provided by the present invention is simple, the raw materials are cheap and easily available, the anti-rutting asphalt obtained has excellent performance, and can achieve the high-value conversion of kerosene co-refining residue, which has promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The complex shear modulus diagram of the sample prepared in the embodiment and the matrix asphalt of the comparative example 1 is analyzed by a dynamic shear rheometer;

[0034] Figure 2 The rutting factor diagram of the sample prepared in the embodiment and the base asphalt of the comparative example 1 is analyzed by a dynamic shear rheometer;

[0035] Figure 3 The phase angle diagram of the sample prepared in the embodiment and the base asphalt of the comparative example 1 was analyzed using a dynamic shear rheometer. DETAILED DESCRIPTION

[0036] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0037] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0038] The present invention provides a composition for preparing kerosene co-refining residue-based asphalt, the composition contains base asphalt, kerosene co-refining residue, rubber powder, thermoplastic elastomer SBS, solubilizer, and cross-linking agent;

[0039] The weight ratio of the base asphalt, the kerosene co-refining residue, the rubber powder, the thermoplastic elastomer SBS, the solubilizer and the cross-linking agent is 100:20-50:5-15:2-8:5-15:0.1-0.5.

[0040] The invention prepares kerosene co-refining residue-based asphalt by specifically combining base asphalt, kerosene co-refining residue, rubber powder, thermoplastic elastomer SBS, solubilizer and cross-linking agent and proportioning them according to a specific weight ratio. The kerosene co-refining residue-based asphalt has excellent anti-rutting asphalt performance and can greatly improve the anti-rutting deformation performance and anti-cracking performance of asphalt mixture for road construction.

[0041] In the present invention, the source of the base asphalt is not limited. In a specific embodiment, the base asphalt can be straight-run asphalt, and the components are composed of saturated components, aromatic components, colloids and asphaltenes according to the group composition analysis method. In a preferred embodiment, the needle penetration of the base asphalt at 25°C and a depth of 0.1 mm is 60-100, specifically, for example, 60, 70, 80, 90 or 100.

[0042] In the present invention, the kerosene co-refining residue is a low-quality oil residue produced as a by-product of a kerosene co-refining device, produced from a kerosene co-refining hydrogenation device, and is a heavy residue containing heavy oil, asphaltene, pre-asphaltene and tetrahydrofuran insolubles. In a specific embodiment, the softening point of the kerosene co-refining residue can be 100-150°C, for example, 100°C, 110°C, 121°C, 130°C, 140°C or 150°C. In a preferred embodiment, the content of tetrahydrofuran solubles in the kerosene co-refining residue can be 60-70wt%, and the ash content is 5-15wt%. In the present invention, tetrahydrofuran insolubles refer to substances insoluble in tetrahydrofuran; tetrahydrofuran solubles refer to substances soluble in tetrahydrofuran.

[0043] In the present invention, the role of the rubber powder is to increase the flexibility of the modified asphalt, making it less likely to soften at high temperatures and less likely to break at low temperatures. In order to ensure that the rubber powder is evenly dispersed in the modified asphalt, improve its compatibility with the matrix asphalt and the stability of the modified asphalt, it is necessary to limit the particle size of the rubber powder to a suitable range. In a preferred embodiment, the particle size of the rubber powder is 0.18 to 0.38 mm, that is, the rubber powder is a rubber powder that passes through a sieve with a mesh size of 40 to 80.

[0044] In the present invention, the role of adding thermoplastic elastomer SBS is to improve the anti-aging performance, low temperature performance and the ability to resist deformation of modified asphalt. In a specific embodiment, the thermoplastic elastomer SBS is a styrene-butadiene-styrene block copolymer, and the block ratio of the thermoplastic elastomer SBS is 30 / 70 or 40 / 60. In a specific embodiment, the structure of the thermoplastic elastomer SBS is linear or star-shaped. In a preferred embodiment, the thermoplastic elastomer SBS can be SBS1301 (block ratio 30 / 70, linear), SBS1401 (block ratio 40 / 60, linear) and SBS4303 (block ratio 30 / 70, star-shaped).

[0045] In the present invention, the effect of solubilizing agent is to promote rubber powder and thermoplastic elastomer SBS to fully swell in kerosene co-refining residue and matrix asphalt, and to be evenly dispersed. In a specific embodiment, the solubilizing agent can be one or more of high aromatic oil, rubber oil, and three-line extraction oil. In a preferred embodiment, the compatilizer is high aromatic oil, and its aromatic content is ≥80wt%, and the main component of high aromatic oil is condensed ring aromatic hydrocarbons. Adopting high aromatic oil as solubilizing agent can improve the compatibility of thermoplastic elastomer SBS, rubber powder and matrix asphalt, and increase the stability of kerosene co-refining residue-based asphalt.

[0046] In the present invention, the cross-linking agent is added to prevent the kerosene co-refining residue-based asphalt finished product from having poor storage stability, and its function is to promote cross-linking between polymer molecules and between polymer-kerosene co-refining residue / matrix asphalt components, thereby increasing the service life of the kerosene co-refining residue-based anti-rutting asphalt. In a specific embodiment, the cross-linking agent is sulfur and / or a sulfur-containing compound. In a preferred embodiment, the cross-linking agent is sulfur.

[0047] The second aspect of the present invention provides a method for preparing kerosene co-refining residue-based asphalt, wherein the kerosene co-refining residue-based asphalt is prepared using the composition described above, and the method comprises the following steps:

[0048] (1) heating kerosene co-refining residue and base asphalt to a molten state;

[0049] (2) stirring the molten kerosene co-refining residue and the molten base asphalt at 120-170° C. for 10-20 minutes, then adding a solubilizer and stirring at 150-170° C. for 10-20 minutes, and then adding rubber powder and thermoplastic elastomer SBS in sequence and stirring at 170-190° C. for 20-60 minutes;

[0050] (3) shearing the mixture obtained in step (2) at 180-200° C. for 40-90 min;

[0051] (4) Mixing the mixture obtained in step (3) with a cross-linking agent and stirring at 180-200° C. for 60-180 min.

[0052] In the method of the present invention, according to a specific order of adding materials and controlling the mixing temperature and time in each step, the anti-rutting performance can be greatly improved. In a specific technical scheme, after the molten kerosene co-refining residue is evenly mixed with the base asphalt, a solubilizer is added, and then rubber powder and thermoplastic elastomer SBS are added in sequence, and after swelling and shearing, they are evenly dispersed in the blend system of the kerosene co-refining residue and the base asphalt, and finally a cross-linking agent is added to develop. The prepared modified asphalt can greatly improve its anti-rutting performance and is suitable for use in southern my country and areas with heavy traffic flow loads.

[0053] In the present invention, the role of the solubilizer is to promote the full swelling and uniform dispersion of rubber powder and thermoplastic elastomer SBS in the blend of kerosene co-refining residue and matrix asphalt; the addition of the cross-linking agent is to prevent the storage stability of the kerosene co-refining residue-based anti-rutting asphalt product obtained from poor, and the cross-linking agent can promote cross-linking between polymer molecules and between polymer-kerosene co-refining residue / matrix asphalt components, thereby increasing the service life of the kerosene co-refining residue-based anti-rutting asphalt.

[0054] In the present invention, the kerosene co-refining residue and the base asphalt may be heated to a molten state at a conventional heating temperature.

[0055] In a specific embodiment, in step (1), the temperature at which the kerosene co-refining residue is heated may be 130-170°C.

[0056] In a specific embodiment, in step (1), the temperature at which the base asphalt is heated can be 100-150°C.

[0057] In a preferred embodiment, in step (2), the stirring rate is 400-1000 rpm.

[0058] In a specific embodiment, in step (3), the shearing device can be a high shear mixing emulsifier commonly used in the art; the shearing effect is to make the kerosene co-refining residue, thermoplastic elastomer SBS, and rubber powder uniformly dispersed in the matrix asphalt. In a preferred embodiment, in step (3), the shearing rate is 3000-5000rpm.

[0059] In a preferred embodiment, in step (4), the stirring rate is 400-1000 rpm.

[0060] The preparation method provided by the invention is simple, the raw materials are cheap and easily available, the prepared anti-rutting asphalt has excellent performance, and can realize the high-value conversion problem of kerosene co-refining residue, and has promotion value.

[0061] The third aspect of the present invention provides a kerosene co-refining residue-based asphalt prepared by the method described above.

[0062] The kerosene co-refining residue-based asphalt prepared by the method of the present invention has greater hardness, lower fluidity at high temperature, and higher low-temperature ductility, and therefore has better high and low temperature performance, deformation resistance and rutting resistance.

[0063] The present invention will be described in detail below by way of examples, but the protection scope of the present invention is not limited thereto.

[0064] Example 1

[0065] The kerosene co-refining residue-based asphalt provided in this embodiment is made of the following raw material components by weight: 100 parts of base asphalt, 50 parts of kerosene co-refining residue, 5 parts of rubber powder, 6 parts of thermoplastic elastomer SBS, 10 parts of solubilizer, and 0.1 part of cross-linking agent.

[0066] The needle penetration of the matrix asphalt at 25°C and 0.1mm is 70; the softening point of the kerosene co-refining residue is 121°C, and after treatment with a Soxhlet extractor, the content of tetrahydrofuran soluble matter is 66.1wt%, and the ash content is 12.3wt%; the particle size of the rubber powder is 0.38mm (40 mesh); the thermoplastic elastomer SBS is SBS1301 (block ratio 30 / 70, linear); the solubilizer is high aromatic oil with an aromatic content of 84wt%; and the cross-linking agent is sulfur powder.

[0067] The preparation method of kerosene co-refining residue-based asphalt comprises the following steps:

[0068] (1) heating kerosene co-refining residue at 130°C to a molten state, and heating base asphalt at 100°C to a molten state;

[0069] (2) mixing the molten kerosene co-refining residue obtained in step (1) with the molten base asphalt in a mass ratio, stirring at 400 rpm for 10 min at 120° C., then adding a solubilizer, stirring at 400 rpm for 20 min at 150° C., then adding rubber powder, stirring at 400 rpm for 20 min at 170° C., then adding a thermoplastic elastomer SBS, and stirring at 400 rpm for 30 min at 180° C.;

[0070] (3) shearing the mixture obtained in step (2) at 185° C. and 3000 rpm for 45 min;

[0071] (4) Add a stabilizer to the asphalt mixture obtained in step (3), and stir at 180° C. and 400 rpm for 120 min.

[0072] Example 2

[0073] The kerosene co-refining residue-based asphalt provided in this embodiment is made of the following raw material components by weight: 100 parts of base asphalt, 20 parts of kerosene co-refining residue, 12 parts of rubber powder, 2 parts of thermoplastic elastomer SBS, 5 parts of solubilizer, and 0.2 parts of cross-linking agent.

[0074] The needle penetration of the matrix asphalt at 25°C and 0.1mm is 70; the softening point of the kerosene co-refining residue is 121°C, and after treatment with a Soxhlet extractor, the content of tetrahydrofuran solubles is 66.1wt%, and the ash content is 12.3wt%; the particle size of the rubber powder is 0.25mm (60 mesh); the thermoplastic elastomer SBS is SBS1401 (block ratio 40 / 60, linear); the solubilizer is high aromatic oil with an aromatic content of 84wt%; and the cross-linking agent is sulfur powder.

[0075] The preparation method of kerosene co-refining residue-based asphalt comprises the following steps:

[0076] (1) heating the kerosene co-refining residue at 150°C to a molten state, and heating the base asphalt at 130°C to a molten state;

[0077] (2) mixing the molten kerosene co-refining residue obtained in step (1) with the molten base asphalt in a mass ratio, stirring at 600 rpm for 15 min at 130° C., then adding a solubilizer, stirring at 600 rpm for 15 min at 160° C., then adding rubber powder, stirring at 800 rpm for 20 min at 180° C., then adding a thermoplastic elastomer SBS, stirring at 800 rpm for 25 min at 185° C.;

[0078] (3) shearing the mixture obtained in step (2) at 185° C. and 4000 rpm for 60 min;

[0079] (4) Add a stabilizer to the asphalt mixture obtained in step (3), and stir at 185° C. and 800 rpm for 60 min.

[0080] Example 3

[0081] The kerosene co-refining residue-based asphalt provided in this embodiment is made of the following raw material components by weight: 100 parts of base asphalt, 30 parts of kerosene co-refining residue, 15 parts of rubber powder, 4 parts of thermoplastic elastomer SBS, 12 parts of solubilizer, and 0.3 parts of cross-linking agent.

[0082] The needle penetration of the matrix asphalt at 25°C and 0.1mm is 70; the softening point of the kerosene co-refining residue is 121°C, and after treatment with a Soxhlet extractor, the content of tetrahydrofuran soluble matter is 66.1wt%, and the ash content is 12.3wt%; the particle size of the rubber powder is 0.25mm (60 mesh); the thermoplastic elastomer SBS is SBS1301 (block ratio 30 / 70, linear); the solubilizer is high aromatic oil with an aromatic content of 84wt%; and the cross-linking agent is sulfur powder.

[0083] The preparation method of kerosene co-refining residue-based asphalt comprises the following steps:

[0084] (1) heating the kerosene co-refining residue at 170°C to a molten state, and heating the base asphalt at 150°C to a molten state;

[0085] (2) the molten kerosene co-refining residue obtained in step (1) is mixed with the molten base asphalt in a mass ratio, and stirred at 170°C at 1000 rpm for 20 min, then a solubilizer is added, and stirred at 160°C at 600 rpm for 15 min, then rubber powder is added, and stirred at 190°C at 400 rpm for 20 min, and then a thermoplastic elastomer SBS is added, and stirred at 170°C at 600 rpm for 20 min;

[0086] (3) shearing the mixture obtained in step (2) at 180° C. and 4000 rpm for 90 min;

[0087] (4) Add a stabilizer to the asphalt mixture obtained in step (3), and stir at 180° C. and 1000 rpm for 60 min.

[0088] Example 4

[0089] The kerosene co-refining residue-based asphalt provided in this embodiment is made of the following raw material components by weight: 100 parts of base asphalt, 40 parts of kerosene co-refining residue, 8 parts of rubber powder, 8 parts of thermoplastic elastomer SBS, 15 parts of solubilizer, and 0.5 parts of cross-linking agent.

[0090] The needle penetration of the matrix asphalt at 25°C and 0.1mm is 70; the softening point of the kerosene co-refining residue is 121°C, and after treatment with a Soxhlet extractor, the content of tetrahydrofuran soluble matter is 66.1wt%, and the ash content is 12.3wt%; the particle size of the rubber powder is 0.18mm (80 mesh), and the thermoplastic elastomer SBS is SBS4303 (block ratio 30 / 70, star-shaped); the solubilizer is high aromatic oil with an aromatic content of 84wt%; and the cross-linking agent is sulfur powder.

[0091] The preparation method of kerosene co-refining residue-based asphalt comprises the following steps:

[0092] (1) heating the kerosene co-refining residue at 160° C. to a molten state, and heating the base asphalt at 140° C. to a molten state;

[0093] (2) mixing the molten kerosene co-refining residue obtained in step (1) with the molten base asphalt in a mass ratio, stirring at 800 rpm for 15 min at 160° C., then adding a solubilizer, stirring at 800 rpm for 20 min at 170° C., then adding rubber powder, stirring at 800 rpm for 30 min at 180° C., then adding a thermoplastic elastomer SBS, and stirring at 400 rpm for 30 min at 190° C.;

[0094] (3) shearing the mixture obtained in step (2) at 200° C. and 3000 rpm for 40 min;

[0095] (4) Add a stabilizer to the asphalt mixture obtained in step (3), and stir at 200° C. and 400 rpm for 180 min.

[0096] Comparative Example 1

[0097] The base asphalt with a needle penetration of 70 at 25°C and 0.1 mm was used as a control example without any modification.

[0098] Comparative Example 2

[0099] The method of Example 1 was followed, except that the kerosene co-refining residue was 10 parts.

[0100] Comparative Example 3

[0101] The method of Example 1 was followed, except that the kerosene co-refining residue was 60 parts.

[0102] Comparative Example 4

[0103] The method of Example 1 is followed, except that the amount of the thermoplastic elastomer SBS is 1 part.

[0104] Comparative Example 5

[0105] The method of Example 1 was followed, except that the amount of the thermoplastic elastomer SBS was 12 parts.

[0106] Comparative Example 6

[0107] The method of Example 1 was followed, except that in step (2), the rubber powder and the thermoplastic elastomer SBS were added simultaneously and stirred at 170° C. and 400 rpm for 50 min.

[0108] Test Case

[0109] (1) Various indicators of the samples prepared in the above embodiments and comparative examples were tested, and the results are shown in Table 1.

[0110] The standards for testing various indicators are as follows:

[0111] Needle penetration (25℃, 0.1mm): GB / T 4509-2010 "Determination of needle penetration of asphalt";

[0112] Softening point: GB / T 4507-2014 "Determination of softening point of asphalt - Ring and ball method";

[0113] Ductility (10°C): GB / T 4508-2010 "Determination of Ductility of Asphalt";

[0114] Dynamic viscosity (60°C): JTG E20-T0620 "Dynamic viscosity test of asphalt".

[0115] Table 1

[0116]

[0117]

[0118] It can be seen from Table 1 that the samples prepared in the embodiment have a moderately lower penetration, a higher softening point, a greater ductility at 10°C, a moderately greater dynamic viscosity at 60°C, and excellent comprehensive performance compared with the base asphalt in the comparative example. It can be seen that the kerosene co-refining residue-based asphalt prepared by the method described in the present invention has an increased hardness, a poorer fluidity at high temperature, and an enhanced ductility at low temperature.

[0119] Compared with the base asphalt, the high and low temperature performance of the kerosene co-refining residue-based anti-rutting asphalt samples are improved, the ability to resist deformation is increased, and the anti-rutting ability is enhanced.

[0120] Comparative Examples 2 and 3 show the effect of the amount of kerosene co-refining residue on the kerosene co-refining residue-based asphalt obtained. In Comparative Example 2, the amount of kerosene co-refining residue used is too small, which affects the viscosity at 60°C. The dynamic viscosity at 60°C is too small, and the ability of the kerosene co-refining residue-based asphalt obtained to resist deformation is weak. In Comparative Example 3, the amount of kerosene co-refining residue used is too large, which will cause internal agglomeration of the system and affect the ductility. The ductility of the kerosene co-refining residue-based asphalt obtained is too small.

[0121] The performance of Comparative Examples 4 and 5 mainly reflects the performance difference from Example 1. In Comparative Examples 4 and 5, the ductility of the obtained kerosene co-refining residue-based asphalt is not significantly improved, which has a negative impact on the low-temperature performance.

[0122] Comparative Example 6 has too high viscosity and too low penetration, and the kerosene co-refining residue-based asphalt obtained becomes hard, which is not conducive to construction.

[0123] (2) The complex shear modulus, rutting factor and phase angle of the samples prepared in Example 1 and Comparative Example 1 were analyzed using a dynamic shear rheometer. The results are shown in Table 1. Figure 1 , Figure 2 and Figure 3 .

[0124] Depend on Figure 1 , Figure 2 , Figure 3It can be seen that the kerosene co-refining residue-based asphalt sample prepared in the embodiment has an increased complex shear modulus, an increased rutting factor, and a smaller phase angle compared with the base asphalt of Comparative Example 1, indicating that the kerosene co-refining residue-based asphalt sample has a better ability to resist deformation and its anti-rutting performance is greatly improved compared with that of the base asphalt.

[0125] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A composition for preparing kerosene co-refining residue-based asphalt, characterized in that: The composition contains base asphalt, kerosene co-refining residue, rubber powder, thermoplastic elastomer SBS, solubilizer and cross-linking agent; Wherein, the weight ratio of the base asphalt, the kerosene co-refining residue, the rubber powder, the thermoplastic elastomer SBS, the solubilizer, and the cross-linking agent is 100:20-50:5-15:2-8:5-15:0.1-0.5; The softening point of the kerosene co-refining residue is 121°C. After treatment with a Soxhlet extractor, the content of tetrahydrofuran solubles is 66.1wt% and the ash content is 12.3wt%; The method for preparing kerosene co-refining residue-based asphalt comprises the following steps: (1) heating kerosene co-refining residue and base asphalt to a molten state; (2) stirring the molten kerosene co-refining residue and the molten base asphalt at 120-170° C. for 10-20 minutes, then adding a solubilizer and stirring at 150-170° C. for 10-20 minutes, and then adding rubber powder and thermoplastic elastomer SBS in sequence and stirring at 170-190° C. for 20-60 minutes; (3) shearing the mixture obtained in step (2) at 180-200° C. for 40-90 min; (4) Mixing the mixture obtained in step (3) with a cross-linking agent and stirring at 180-200° C. for 60-180 min.

2. The composition according to claim 1, characterized in that The base asphalt has a needle penetration of 60 to 100 at 25°C and a depth of 0.1 mm.

3. The composition according to claim 1 or 2, characterized in that The particle size of the rubber powder is 0.18-0.38 mm.

4. The composition according to claim 1, characterized in that The thermoplastic elastomer SBS is a styrene-butadiene-styrene block copolymer, and the block ratio of the thermoplastic elastomer SBS is 30 / 70 or 40 / 60.

5. The composition according to claim 4, characterized in that The structure of the thermoplastic elastomer SBS is linear or star-shaped.

6. The composition according to claim 1, characterized in that The solubilizing agent is one or more than two of high aromatic oil, rubber oil and three-line extraction oil.

7. The composition according to claim 1, characterized in that The cross-linking agent is sulfur and / or a sulfur-containing compound.

8. A method for preparing kerosene co-refining residue-based asphalt, wherein the kerosene co-refining residue-based asphalt is prepared using the composition according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: (1) heating kerosene co-refining residue and base asphalt to a molten state; (2) stirring the molten kerosene co-refining residue and the molten base asphalt at 120-170° C. for 10-20 minutes, then adding a solubilizer and stirring at 150-170° C. for 10-20 minutes, and then adding rubber powder and thermoplastic elastomer SBS in sequence and stirring at 170-190° C. for 20-60 minutes; (3) shearing the mixture obtained in step (2) at 180-200° C. for 40-90 min; (4) Mixing the mixture obtained in step (3) with a cross-linking agent and stirring at 180-200° C. for 60-180 min.

9. The method according to claim 8, characterized in that In step (1), the temperature at which the kerosene co-refining residue is heated is 130 to 170°C.

10. The method according to claim 9, characterized in that In step (1), the temperature at which the base asphalt is heated is 100 to 150°C.

11. The method according to claim 8 or 9, characterized in that: In step (2), the stirring rate is 400-1000 rpm.

12. The method according to claim 8 or 9, characterized in that: In step (3), the shearing rate is 3000-5000 rpm.

13. The method according to claim 8 or 9, characterized in that: In step (4), the stirring rate is 400-1000 rpm.

14. Kerosene co-refining residue-based asphalt prepared by the method according to any one of claims 8 to 13.

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