A wide temperature range pitch and a method for preparing the same

Abstract

The application discloses a wide-temperature-range asphalt and a preparation method thereof. The wide-temperature-range asphalt is composed of a base asphalt and a blending asphalt component which are uniformly mixed, wherein the mass ratio of the base asphalt to the blending asphalt component is 1:0.2-8, the base asphalt is an asphalt product of an asphalt grade matched with a local climate, the blending asphalt component is prepared from crude oil with an asphaltene content of not less than 8wt% by using a distillation or oxidation process, and the penetration of the blending asphalt component and the base asphalt is not more than 20. The wide-temperature-range asphalt and the preparation method thereof provided by the application can obtain the wide-temperature-range asphalt with higher penetration and higher softening point, improve the temperature sensitivity of the asphalt, and widen the temperature range or geographical environment of the asphalt. The prepared wide-temperature-range asphalt product has good compatibility and high stability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of petroleum refining and highway engineering, and relates to a wide temperature range asphalt and a preparation method thereof. Specifically, a high asphaltene content crude oil is used as a raw material, and an asphalt component produced by a refining process is blended into a grade asphalt in a certain proportion, so that the penetration and softening point of the asphalt are improved, a wide temperature range asphalt is obtained, the use temperature range and geographical environment of the asphalt are widened, and the production and use costs of the wide temperature range asphalt are reduced. BACKGROUND

[0002] The present application relates to a wide temperature range asphalt and a preparation method thereof, so as to widen the use temperature range and geographical environment of the asphalt, and reduce the production and use costs of the wide temperature range asphalt. With the rapid development of the transportation industry, higher requirements are put forward for highway construction: a highway between every two villages, and a highway between every two villages. China is vast in territory, and the temperature difference between the north and the south is large. The ultraviolet radiation in Xinjiang and Tibet is strong. In the south, the highest temperature in summer reaches above 40℃, and in the north, the lowest temperature in winter can reach -40℃. Therefore, in order to expand the use temperature range of the asphalt and improve the application range of the asphalt, the asphalt needs to have good temperature sensitivity, that is, the asphalt not only needs to have a large penetration to resist cracking of the road surface at low temperature, but also needs to have a high softening point, so that the asphalt does not flow and produce ruts at high temperature when paving the road surface. Since the properties of the asphalt product are greatly dependent on the properties of the crude oil, the temperature sensitivity of the asphalt product directly produced by the distillation process is poor, which is specifically manifested in that when the penetration of the asphalt is large, the softening point is low, and the temperature sensitivity index is small. Therefore, people develop a modified asphalt with excellent high and low temperature performance by using a high molecular material (such as SBS) as a modifier as a one-time solution, but the production of the modified asphalt by using the high molecular material not only needs a large amount of high molecular material whose price is several times or even tens of times higher than that of the asphalt, but also requires a complex production process due to the poor compatibility between the asphalt and the high molecular material, so as to result in high production cost. Moreover, the modified asphalt produced by using the high molecular material has poor workability, which greatly increases the highway construction cost.

[0003] At present, in order to improve the service temperature range or geographical environment of asphalt, the way of adding chemical modifier or polymer material is usually adopted to improve the service temperature range or geographical environment of asphalt. For example: CN201410771143.2 discloses a wide-range asphalt and its preparation method, which uses vacuum residue or soft asphalt to add chemical modifier to prepare wide-range asphalt, the chemical modifier is at least one of the group consisting of calcium oxide and calcium hydroxide, and the addition amount is in the range of 0.05-8wt%. The asphalt prepared by the method has higher penetration index and excellent high-temperature performance, and can be used in areas with large diurnal temperature difference, heavy traffic, heavy load and super heavy load traffic pavement. However, the chemical modifier such as calcium oxide and calcium hydroxide is inorganic matter, which seriously affects the ductility of asphalt, and calcium oxide and calcium hydroxide are easy to heat when they come into contact with water, which greatly deteriorates the water stability of asphalt mixture and the bonding force between asphalt and aggregate, causing water damage and heaving of asphalt pavement.

[0004] CN01210259277.7 discloses a wide-temperature-range modified asphalt for road and its preparation method, which is composed of the following components by weight: base asphalt 80-90 parts, SBS modifier 1-6 parts, activated waste tire rubber powder 10-30 parts, light oil 2-6 parts, terpene resin 0.1-0.5 parts, and elemental sulfur 0.1-0.5 parts. The asphalt prepared by the method has good performance of high-temperature non-flowing and low-temperature non-cracking, and the use temperature range can reach above 100℃; the preparation method is simple, and the production can be directly carried out on the original SBS modifier production device, saving the cost investment of production equipment. However, since the prices of SBS modifier, terpene resin and elemental sulfur as modifiers are much higher than the price of asphalt, the raw material cost of asphalt is greatly increased by using this method to prepare wide-temperature-range asphalt. In addition, since SBS modifier, activated waste tire rubber powder, terpene resin and elemental sulfur need to be added, the compatibility and stability of SBS modifier and activated waste tire rubber powder with base asphalt need to be solved, the process is relatively complex, the equipment requirements are strict, and therefore the production cost of asphalt is greatly increased.

[0005] The research on wide-range asphalt in the "Tenth National Oil Asphalt Technology Exchange Conference Paper Collection" (P39-43) proposes that the base asphalt is oxidized or blended to meet the required consistency, and then sent to the mixing tank to add 3wt% of modifier and 1wt% of additive at a certain temperature. The modifier (gelling type) is a self-synthesized sample, and the additive (peptizing agent) is a commercial product. The advantage of the developed wide-range asphalt is that it has good high-temperature performance, aging resistance and small temperature sensitivity. However, since synthetic gelling type modifier and peptizing agent additive need to be added, the production cost is greatly increased; and since gelling type modifier is added, the uniformity of mixing and the stability of the product need to be solved during production. SUMMARY

[0006] The technical problem solved by the present application is to provide a wide temperature range asphalt and a preparation method thereof, which can improve the penetration and softening point of the asphalt, and reduce the production and use cost of the wide temperature range asphalt.

[0007] A wide temperature range asphalt, which is composed of a base asphalt and a blending asphalt component uniformly mixed, wherein the mass ratio of the base asphalt to the blending asphalt component is 1:0.2-8, the base asphalt is an asphalt product of an asphalt grade matched with the local climate, the blending asphalt component is prepared from a crude oil with an asphaltene content of not less than 8wt% by using a distillation or oxidation process, and the penetration difference between the blending asphalt component and the base asphalt is not more than 20.

[0008] A preparation method of a wide temperature range asphalt, comprising the following steps:

[0009] (1) selecting an asphalt product of an asphalt grade matched with the local climate as the base asphalt;

[0010] (2) preparing a blending asphalt component from a crude oil with an asphaltene content of not less than 8wt% by using a distillation or oxidation process, wherein the penetration difference between the blending asphalt component and the base asphalt is not more than 20;

[0011] (3) uniformly mixing the base asphalt and the blending asphalt component at a mass ratio of 1:0.2-8 under the conditions of a heating temperature of 100-160℃ and a rotation speed of 100-800rpm for 10-60min to prepare a wide temperature range asphalt.

[0012] The wide temperature range asphalt product prepared by the preparation method of the wide temperature range asphalt.

[0013] The wide temperature range asphalt provided by the present application and the preparation method thereof and the obtained product have the following beneficial effects:

[0014] The wide temperature range asphalt provided by the present application and the preparation method thereof can obtain a wide temperature range asphalt with a high penetration and a high softening point, improve the temperature sensitivity of the asphalt, and broaden the use temperature range or geographical environment of the asphalt. Meanwhile, since the asphalt is modified asphalt, the compatibility and mixing uniformity are good when the two are mixed, the workability is good, the production and use cost of the wide temperature range asphalt can be reduced, and the prepared wide temperature range asphalt product has good compatibility and high stability.

[0015] The wide temperature range asphalt provided by the present application has a penetration greater than that of the base asphalt, a softening point higher than that of the base asphalt, and a temperature sensitivity better than that of the base asphalt. DETAILED DESCRIPTION

[0016] The specific embodiments of the present application are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative and explanatory in nature and are not intended to limit the application.

[0017] In a first aspect, the present application provides a wide temperature range asphalt, which is composed of a base asphalt and a blending asphalt component, wherein the mass ratio of the base asphalt to the blending asphalt component is 1:0.2-8, the base asphalt is an asphalt product of an asphalt grade matching the local climate, the blending asphalt component is prepared from a crude oil with an asphaltene content of not less than 8wt% by using a distillation or oxidation process, and the difference between the penetration of the blending asphalt component and that of the base asphalt is not more than 20. The unit of the penetration is 1 / 10 mm.

[0018] Preferably, the mass ratio of the base asphalt to the blending asphalt component is 1:0.5-6, more preferably 1:0.6-4.

[0019] Preferably, the asphaltene content of the crude oil is not less than 10wt%, more preferably the asphaltene content of the crude oil is not less than 14wt%. The resin content of the crude oil is not more than 10wt%, more preferably the resin content of the crude oil is not more than 8wt%.

[0020] In a second aspect, the present application provides a preparation method of a wide temperature range asphalt, which comprises the following steps:

[0021] (1) selecting an asphalt product of an asphalt grade matching the local climate as the base asphalt;

[0022] (2) preparing a blending asphalt component from a crude oil with an asphaltene content of not less than 8wt% by using a distillation or oxidation process, wherein the difference between the penetration of the blending asphalt component and that of the base asphalt is not more than 20;

[0023] (3) mixing the base asphalt and the blending asphalt component according to a mass ratio of 1:0.2-8 under the conditions of a heating temperature of 100-160℃ and a rotation speed of 100-800rpm for 10-60min to prepare a wide temperature range asphalt.

[0024] In the method provided by the present application, the selection of the base asphalt in step (1) is related to the region where the wide temperature range asphalt product is applied, and an asphalt product of a suitable grade is selected as the base asphalt according to the average temperature of the target construction region (see Table 1 for the specific climate division).

[0025] In the method provided by the present application, in step (2), preferably, the asphaltene content of the crude oil is not less than 10wt%, more preferably the asphaltene content of the crude oil is not less than 14wt%. Preferably, the resin content of the crude oil is not more than 10wt%, more preferably the resin content of the crude oil is not more than 8wt%.

[0026] In the method provided by the present application, in step (2), the crude oil is subjected to atmospheric and vacuum distillation process or distillation-oxidation combined process to produce a blending asphalt component. The oxidation process refers to that air is introduced into the raw material under certain temperature conditions to change the composition of the raw material, increase the softening point, and reduce the penetration and temperature sensitivity, so as to meet the specification index and use performance requirements. The variables of the oxidation process are oxidation temperature, oxidation time and oxidation air volume. By changing the composition of the raw material and the oxidation conditions, the purpose of adjusting the oxidation depth can be achieved, and the production of road asphalt, construction asphalt and other special asphalts can be realized.

[0027] Preferably, the crude oil is subjected to atmospheric and vacuum distillation to produce the blending asphalt component; preferably, the initial boiling point of the blending asphalt component is not lower than 360°C, more preferably not lower than 380°C.

[0028] In step (2), the asphaltene content of the blending asphalt component is not less than 15 wt%, preferably the asphaltene content is 18-30 wt%. The resin content of the blending asphalt component is not higher than 30 wt%, preferably not higher than 25 wt%.

[0029] In step (3) of the method provided by the present application, preferably, the mass ratio of the matrix asphalt to the blending asphalt component is 1:0.5-6, more preferably the mass ratio is 1:0.6-4.

[0030] In step (3), preferably, the temperature for mixing the matrix asphalt and the blending asphalt component is 120°C-140°C; the stirring speed for mixing the matrix asphalt and the blending asphalt component is 100-800 rpm, more preferably 300-600 rpm; the mixing time of the matrix asphalt and the blending asphalt component is 10-60 min, more preferably 20-40 min.

[0031] The present application will be further described in combination with the examples of the present application. The purpose is to better illustrate the content of the present application, but the content of the present application is not limited to the following examples.

[0032] The types and properties of the crude oils selected in the examples and comparative examples of the present application are listed in Table 2, the processing processes of the selected crude oils and the properties of the blending asphalt components obtained are listed in Table 3, the sources and properties of the selected matrix asphalts are listed in Table 4, and the properties of the wide temperature range asphalts in the examples and comparative examples are listed in Tables 5-6.

[0033] To fully demonstrate the universality of the blending asphalt component to improve the temperature sensitivity of the base asphalt, the asphalts with different penetration were selected as the base asphalt. As can be seen from the data in Table 4, among the three selected base asphalts, the performances of two base asphalts (Liaohe asphalt and Jinling asphalt) all meet the product index requirements of AH-90 in the Heavy Traffic Road Petroleum Asphalt GB / T15180, and they are qualified AH-90 products, and the performances of one base asphalt (Chunfeng asphalt) all meet the product index requirements of AH-70 in the Heavy Traffic Road Petroleum Asphalt GB / T15180, and it is a qualified AH-70 product.

[0034] Example 1

[0035] (1) The 90# asphalt suitable for the climate zoning code 2-2 in North China was selected as the base asphalt, and the Liaohe asphalt in Table 4 was selected as the base asphalt.

[0036] (2) The Tahe No. 2 associated crude oil with the asphaltene content of 15.5wt% in Table 2 was used as the raw material to perform the atmospheric and vacuum distillation, and the distillation cutting temperature was controlled to be 380°C on the real boiling point distillation instrument, so as to prepare the >380°C residual oil of the Tahe No. 2 associated crude oil as the blending asphalt component. The asphaltene content of the blending asphalt component was 21.4wt%, and the detailed properties were shown in the >380°C residual oil of the Tahe No. 2 associated crude oil distillation cutting in Table 3.

[0037] (3) The Liaohe asphalt in Table 4 and the >380°C residual oil of the Tahe No. 2 associated crude oil distillation cutting in Table 3 as the blending asphalt component were mixed and heated at the ratio of 1:2.3, the heating temperature was 130°C, and the stirring was performed at the rotating speed of 300rpm for 30 minutes. The property analysis results of the mixture of the >380°C residual oil of the Tahe No. 2 associated crude oil distillation cutting and the Liaohe asphalt were shown in Table 5.

[0038] As can be seen from the data in Table 5, the wide temperature range asphalt prepared by using the blending asphalt component provided in Example 1 has the penetration far greater than the penetrations of the two raw materials (the base asphalt and the blending asphalt component), and the temperature sensitivity index PI is greater than the temperature sensitivity index of the base asphalt, and the softening point is also higher than the softening point of the base asphalt.

[0039] Example 2

[0040] (1) The 90# asphalt suitable for the climate zoning code 2-2 in North China was selected as the base asphalt, and the Liaohe asphalt in Table 4 was selected as the base asphalt.

[0041] (2) Take Tahe No. 1 associated crude oil with asphaltene content of 10.0wt% in Table 2 as raw material to carry out atmospheric and vacuum distillation, and control the distillation cut temperature to be 445℃ on a true boiling point distillation instrument to prepare >445℃ residual oil of Tahe No. 1 associated crude oil as a blending asphalt component. The asphaltene content of the blending asphalt component is 18.9wt%, and the detailed properties are shown in Table 3 as >445℃ residual oil of Tahe No. 1 associated crude oil distillation cut.

[0042] (3) Mix and heat Liaoheshi asphalt in Table 4 and >445℃ residual oil of Tahe No. 1 associated crude oil distillation cut in Table 3 as a blending asphalt component according to the ratio of 1:2.3, the heating temperature is 130℃, and stir at the rotation speed of 300rpm for 30 minutes. The property analysis results of >445℃ residual oil of Tahe No. 1 associated crude oil distillation cut after mixing with Liaoheshi asphalt are shown in Table 5.

[0043] It can be seen from the data in Table 5 that the penetration of the wide temperature range asphalt prepared by using the blending asphalt component provided in Example 2 is much greater than the penetrations of the two raw materials (base asphalt and blending asphalt component), and the temperature sensitivity index PI thereof is greater than the temperature sensitivity index of the base asphalt, and the softening point is also higher than the softening point of the base asphalt.

[0044] Example 3

[0045] (1) Select No. 70 asphalt suitable for climate zoning code 2-2 in North China as base asphalt, and take Chunfeng asphalt in Table 4 as base asphalt.

[0046] (2) Take Tahe No. 2 associated crude oil with asphaltene content of 15.5wt% in Table 2 as raw material to carry out atmospheric and vacuum distillation in the laboratory, and control the distillation cut temperature to be 380℃ on a true boiling point distillation instrument to prepare >380℃ residual oil of Tahe No. 2 associated crude oil as a blending asphalt component. The asphaltene content of the blending asphalt component is 21.4wt%, and the detailed properties are shown in Table 3 as >380℃ residual oil of Tahe No. 2 associated crude oil distillation cut.

[0047] (3) Mix and heat Chunfeng asphalt in Table 4 and >380℃ residual oil of Tahe No. 2 associated crude oil distillation cut according to the ratio of 1:1, the heating temperature is 140℃, and stir at the rotation speed of 450rpm for 20 minutes. The property analysis results of >380℃ residual oil of Tahe No. 2 associated crude oil distillation cut after mixing with Chunfeng asphalt are shown in Table 5.

[0048] It can be seen from the data in Table 5 that the penetration of the asphalt prepared by using the blending asphalt component provided in Example 4 is much greater than the penetrations of the two raw materials, and the temperature sensitivity index PI thereof is better than the temperature sensitivity index of the base asphalt, which indicates that the selected component one can indeed improve the use temperature range of the base asphalt.

[0049] Example 4

[0050] (1) Select No. 70 asphalt suitable for climate zoning code 2-2 in North China as base asphalt, and take the Chunfeng asphalt in Table 4 as base asphalt.

[0051] (2) Take the Tahe No. 1 associated crude oil with asphaltene content of 10.0wt% in Table 2 as raw material to perform atmospheric and vacuum distillation in the laboratory, and control the distillation cut temperature to be 445℃ on a real boiling point distillation instrument. The >445℃ residual oil of the Tahe No. 1 associated crude oil is prepared as a blending asphalt component, and the asphaltene content of the blending asphalt component is 18.9wt%, and the detailed properties are shown in the >445℃ residual oil of the Tahe No. 1 associated crude oil in Table 3.

[0052] (3) Mix and heat the Chunfeng asphalt in Table 4 and the >445℃ residual oil of the Tahe No. 1 associated crude oil in Table 3 at a ratio of 1:1, the heating temperature is 140℃, and stir at a rotating speed of 450rpm for 20 minutes. The property analysis results of the >445℃ residual oil of the Tahe No. 1 associated crude oil mixed with the Chunfeng asphalt are shown in Table 5.

[0053] It can be seen from the data in Table 5 that the asphalt prepared by using the blending asphalt component provided in Example 4 has a penetration much greater than the penetrations of the two raw materials, and the temperature sensitivity index PI is better than that of the base asphalt, which indicates that the selected component can indeed improve the use temperature range of the base asphalt.

[0054] Example 5

[0055] (1) Select No. 90 asphalt suitable for climate zoning code 2-2 in North China as base asphalt, and take the Jinling asphalt in Table 4 as base asphalt.

[0056] (2) Take the Tahe No. 1 associated crude oil with asphaltene content of 10.0wt% in Table 2 as raw material to perform atmospheric and vacuum distillation, and control the distillation cut temperature to be 445℃ on a real boiling point distillation instrument. The >445℃ residual oil of the Tahe No. 1 associated crude oil is prepared as a blending asphalt component, and the asphaltene content of the blending asphalt component is 18.9wt%, and the detailed properties are shown in the >445℃ residual oil of the Tahe No. 1 associated crude oil in Table 3.

[0057] (3) Mix and heat the Jinling asphalt in Table 4 and the >445℃ residual oil of the Tahe No. 1 associated crude oil in Table 3 as a blending asphalt component at a ratio of 1:4, the heating temperature is 125℃, and stir at a rotating speed of 400rpm for 20 minutes. The property analysis results of the >445℃ residual oil of the Tahe No. 1 associated crude oil mixed with the Jinling asphalt are shown in Table 5.

[0058] As can be seen from the data in Table 5, the asphalt prepared by using the component one provided in Example 2 has a penetration much greater than the penetrations of the two raw materials (base asphalt and component one), and its temperature sensitivity index PI is better than the temperature sensitivity index of the base asphalt, indicating that the selected component one can indeed improve the temperature range of the base asphalt.

[0059] Example 6

[0060] (1) Select No. 70 asphalt suitable for climate zoning code 2-2 in North China as the base asphalt, and the Kuwait crude oil distillation >505°C asphalt in Table 3 as the base asphalt.

[0061] (2) In the laboratory, the Tahe No. 2 associated crude oil with an asphaltene content of 15.5% by weight in Table 2 was subjected to atmospheric and vacuum distillation, and the distillation cut temperature was controlled to be 380°C on a real boiling point distillation instrument to prepare the >380°C residue of Tahe No. 2 associated crude oil as a blending asphalt component. The asphaltene content of the blending asphalt component was 21.4% by weight, and the detailed properties are shown in Table 3 as the >380°C residue of Tahe No. 2 associated crude oil distillation cut.

[0062] (3) The >505°C asphalt of Kuwait crude oil distillation in Table 3 and the >380°C residue of Tahe No. 2 associated crude oil distillation cut in Table 3 as a blending asphalt component were mixed at a ratio of 1:0.6 and heated at a temperature of 130°C, and stirred at a speed of 400 rpm for 25 minutes. The property analysis results of the blending asphalt after mixing the >380°C residue of Tahe No. 2 associated crude oil distillation cut with Chunfeng asphalt are shown in Table 5.

[0063] As can be seen from the data in Table 5, the asphalt prepared by using the component one provided in Example 3 has a penetration much greater than the penetrations of the two raw materials (base asphalt and component one), and its temperature sensitivity index PI is better than the temperature sensitivity index of the base asphalt, indicating that the selected component one can indeed improve the temperature range of the base asphalt.

[0064] Comparative Example 1

[0065] (1) Select No. 90 asphalt suitable for climate zoning code 2-2 in North China as the base asphalt, and the Liaohe asphalt in Table 4 as the base asphalt.

[0066] (2) The Kuwait crude oil with an asphaltene content of 2.28% by weight in Table 2 was subjected to atmospheric and vacuum distillation, and the distillation cut temperature was controlled to be 505°C on a real boiling point distillation instrument to prepare the >505°C residue of Kuwait crude oil as a blending asphalt component. The asphaltene content of the blending asphalt component was 12.4% by weight, and the detailed properties are shown in Table 3 as the >505°C residue of Kuwait crude oil distillation cut.

[0067] (3) The Jinling asphalt in Table 4 and the Kuwait crude oil distillation >505℃ asphalt in Table 3 as the blending asphalt component were mixed in a ratio of 1:0.6 and heated, the heating temperature was 130℃, and the stirring was carried out at a rotating speed of 300rpm for 30 minutes. The analysis results of the properties of the mixture of the Kuwait crude oil distillation >505℃ asphalt and the Jinling asphalt are listed in Table 6.

[0068] As can be seen from the data in Table 6, the asphalt prepared by using the component one provided by the comparative example 1 has a penetration between the penetrations of the two raw materials (the base asphalt and the component one), and the temperature sensitivity index PI is also worse than the temperature sensitivity index of the base asphalt, which indicates that the selected component one cannot improve the temperature range of the base asphalt.

[0069] Comparative example 2

[0070] (1) The No. 90 asphalt suitable for the climate division code 2-2 in North China was selected as the base asphalt, and the Jinling asphalt in Table 4 was used as the base asphalt.

[0071] The Kuwait crude oil with an asphaltene content of 2.28wt% in Table 2 was used as the raw material to carry out the atmospheric and vacuum distillation in the laboratory, and the Kuwait crude oil >505℃ residue was prepared as the blending asphalt component by controlling the distillation cutting temperature to be 505℃ on the real boiling point distillation instrument. The asphaltene content of the blending asphalt component was 12.4wt%, and the detailed properties can be seen in Table 3 of the Kuwait crude oil distillation cutting >505℃ residue.

[0072] (3) The Jinling asphalt in Table 4 and the Kuwait crude oil distillation >505℃ asphalt in Table 3 as the blending asphalt component were mixed in a ratio of 1:0.6 and heated, the heating temperature was 130℃, and the stirring was carried out at a rotating speed of 300rpm for 30 minutes. The analysis results of the properties of the mixture of the Kuwait crude oil distillation >505℃ asphalt and the Jinling asphalt are listed in Table 6.

[0073] As can be seen from the data in Table 6, the asphalt prepared by using the blending asphalt component provided by the comparative example 2 has a penetration between the penetrations of the two raw materials (the base asphalt and the blending asphalt component), and the temperature sensitivity index PI is worse than the temperature sensitivity index of the base asphalt, which indicates that the selected blending asphalt component cannot improve the temperature range of the base asphalt.

[0074] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the technical framework of the present application shall be included in the protection scope of the present application.

[0075] Table 1 Domestic climate division and asphalt grade

[0076]

[0077] Table 2 Properties of different crude oils

[0078]

[0079] Table 3 Process conditions and properties of different crude oils to prepare blend asphalt components

[0080]

[0081]

[0082] Table 4 Properties of base asphalt

[0083]

[0084] Table 5 Properties of wide temperature range asphalt prepared

[0085]

[0086] Note: Increase in base asphalt temperature susceptibility index / % = (temperature susceptibility index of blend asphalt - temperature susceptibility index of base asphalt) / (| temperature susceptibility index of base asphalt |)

[0087] Table 6 Properties of wide temperature range asphalt prepared

[0088]

[0089]

[0090] Note: Increase in base asphalt temperature susceptibility index / % = (temperature susceptibility index of blend asphalt - temperature susceptibility index of base asphalt) / (| temperature susceptibility index of base asphalt |)

Claims

1. A wide temperature range asphalt, characterized in that, It is composed of a uniform mixture of base asphalt and blended asphalt components, wherein the mass ratio of base asphalt to blended asphalt components is 1:0.6-4. The base asphalt is an asphalt product of a grade matched to the regional climate, with an asphalt content of not less than 8%. wt % of crude oil is distilled to obtain a blended asphalt component with an initial boiling point of not less than 360℃, wherein the penetration of the blended asphalt component differs from that of the base asphalt by no more than 20.

2. The wide temperature range asphalt according to claim 1, characterized in that, The crude oil asphalt content is not less than 10%. wt %; gelatin content not exceeding 10% wt %.

3. The wide temperature range asphalt according to claim 1, characterized in that, The crude oil asphalt content is not less than 14%. wt The crude oil gum content is no higher than 8%. wt %.

4. A method for preparing wide-temperature-range asphalt, characterized in that: Includes the following steps: (1) Select asphalt products with asphalt grades that match the regional climate as base asphalt; (2) Using crude oil with an asphalt content of not less than 8 wt%, a blended asphalt component with an initial boiling point of not less than 360°C is prepared by distillation, wherein the penetration of the blended asphalt component differs from that of the base asphalt by no more than 20. (3) Mix the base asphalt and the blended asphalt components at a mass ratio of 1:0.6-4, and stir for 10-60 minutes at a heating temperature of 100℃-160℃ and a rotation speed of 100-800rpm to prepare a wide temperature range asphalt.

5. The method for preparing wide-temperature-range asphalt according to claim 4, characterized in that, The crude oil asphalt content is not less than 10%. wt %; gelatin content not exceeding 10% wt %.

6. The method for preparing wide-temperature-range asphalt according to claim 5, characterized in that, The crude oil asphalt content is not less than 14%. wt The crude oil gum content is no higher than 8%. wt %.

7. The method for preparing wide-temperature-range asphalt according to claim 4, characterized in that, The crude oil is frequently distilled under reduced pressure to prepare a blended asphalt component, the initial boiling point of which is not lower than 380°C.

8. The method for preparing wide-temperature-range asphalt according to claim 4, characterized in that, The asphalt content of the blended asphalt component is not less than 15%. wt %; the resin content of the blended asphalt component is not higher than 30%. wt %.

9. The method for preparing wide-temperature-range asphalt according to claim 8, characterized in that, The asphalt content of the blended asphalt component is 18-30%. wt %; the resin content of the blended asphalt component is not higher than 25%. wt %.

10. The method for preparing wide-temperature-range asphalt according to claim 4, characterized in that, The mixing temperature of the base asphalt and the blended asphalt components is 120℃-140℃; the mixing speed of the base asphalt and the blended asphalt components is 300-600 rpm; and the mixing time of the base asphalt and the blended asphalt components is 10-60 min.

11. The method for preparing wide-temperature-range asphalt according to claim 10, characterized in that, The mixing time for the base asphalt and blended asphalt components is 20-40 minutes.

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