A 50# asphalt and a preparation method thereof

Abstract

The present application belongs to the technical field of road asphalt, and particularly relates to a No. 50 asphalt and a preparation method. The No. 50 asphalt is composed of 100 parts of No. 70 base asphalt, 2-25 parts of hard deoiled asphalt, 0.5-0.7 parts of a polymer modifier and 0.5-1 part of a phase change material by weight. The present application adopts a blending and slightly modified method to avoid the problem that the production of small-batch No. 50 asphalt by a straight distillation method causes excessive intermediate transition products due to grade switching, thereby affecting product benefits. Compared with the present straight distillation method and blending method for No. 50 asphalt, the present application has good workability, the construction temperature is similar to that of ordinary No. 70 asphalt, and the construction method does not need to be changed. The present application also has good high and low temperature performance, and the index has sufficient excess amount, so that the probability of quality risk in the later use process is greatly reduced. In addition, the present application has good anti-aging performance, the properties do not change substantially after 10 days of high-temperature storage, and the index also meets the requirements of the Ministry of Transport JTG F40 index.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of road asphalt, and particularly relates to a No. 50 asphalt and a preparation method thereof. BACKGROUND

[0002] With the development of economy, the traffic volume and traffic load increase rapidly, and the frequency of extreme weather also increases greatly, so that rutting becomes the main disease type of domestic asphalt pavement. Research shows that the middle and lower layers of the asphalt pavement are prone to deformation under the action of load, and therefore, improving the rutting resistance of the middle and lower layers becomes one of the key technologies for solving the rutting problem. The use of high modulus asphalt or hard asphalt in the middle and lower layers of the asphalt pavement instead of the traditional No. 70 asphalt can effectively improve the rutting resistance of the asphalt pavement, and the hard asphalt has a higher cost performance than the high modulus asphalt for projects with limited budgets. The No. 50 asphalt as a kind of hard asphalt is an effective way to solve the rutting disease of the asphalt pavement.

[0003] However, the current No. 50 asphalt has some problems in production and performance. From the production point of view, there are two production methods for the No. 50 asphalt, namely, straight distillation and blending. The straight distillation method has the following problems: (1) it is generally suitable for large-batch production of No. 50 asphalt, and for small-batch order demand, the straight distillation method has too many intermediate transition products during the grade switching, and the economic benefit of the product is not ideal; (2) it cannot take into account the three indexes, or the index surplus is small, and quality problems may occur; (3) compared with No. 70 asphalt, the high-temperature performance is excellent, the temperature sensitivity is good, but the low-temperature performance is slightly poor; (4) in order to coordinate the indexes of the No. 50 asphalt, the control precision of the straight distillation process is required to be improved; (5) the crude oil also has certain requirements, and only suitable crude oil can produce No. 50 asphalt meeting the requirements of JTG F40; (6) the No. 50 asphalt produced by the straight distillation method has a rapid index decay. Although the blending method for producing No. 50 asphalt overcomes the first problem of the straight distillation method and makes the production more convenient, it also has some hidden dangers: (1) the blending method often uses soft and hard components for blending, the hard component is generally deoiled asphalt, and the soft component is generally residual oil, wax oil, aromatic oil, ordinary No. 70 asphalt, No. 90 asphalt, etc. The blending process often only focuses on the indexes of the asphalt, and ignores the component structure of the blending raw materials and the No. 50 asphalt after blending, and the four components of the No. 50 asphalt may be unreasonable, and there are problems such as poor adhesion to aggregate and loose; and the problems (2), (3) and (6) of the straight distillation method also exist in the blending method.

[0004] Application No. CN 201410289693.0 relates to a 50 asphalt and its production method, which selects residue produced by marie:poscan=7:3 crude oil as hard component, and reduces four-line wax oil as soft component, mixes the soft component according to the blending ratio of 8-12% to prepare the 50 asphalt, which overcomes the problem of unqualified low temperature ductility of the existing 50 asphalt, and the 10℃ ductility before and after aging reaches 17cm, 6cm, meeting the standard requirements of the 50 asphalt of the Ministry of Communications JTG F40. However, the technical scheme does not reflect its anti-aging performance, and at the same time, the construction and workability indexes, the ductility before and after aging and other indexes have limited excess.

[0005] Application No. CN 201911012026.7 relates to a 50 asphalt and its preparation method and application, which selects Kaiser Jay crude oil, Jayno crude oil and Prutoni crude oil as mixed crude oil, oil slurry as distillation regulator, and light oxidant as raw material, and obtains the 50 asphalt through atmospheric and vacuum distillation and deep distillation. However, the 50 asphalt has large fluctuation of low temperature ductility, and the ductility is sometimes >15cm and sometimes <15cm, which does not meet the standard requirements of the 50 asphalt of the Ministry of Communications JTG F40, and only the three indexes before aging are fed back, and the indexes after aging are not described, so that the real performance cannot be judged.

[0006] Application No. CN 201811474299.9 relates to a 50 A-grade road petroleum asphalt and its preparation method, which is prepared from vacuum residue, anti-rutting agent and aromatic oil. The 50 asphalt prepared by the patent has edge index before and after aging, and has quality risk hidden trouble problem of ductility. SUMMARY

[0007] The purpose of the present application is to provide a 50 asphalt and a preparation method to solve the problems in the above background art.

[0008] To achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0009] A 50 asphalt, which is composed of 100 parts by weight of 70 base asphalt, 2-25 parts by weight of hard deoiled asphalt, 0.5-0.7 parts by weight of high molecular modifier and 0.5-1 parts by weight of phase change material.

[0010] Further, the 70 base asphalt is from an atmospheric and vacuum distillation device, which requires a softening point≮47℃, a penetration of 65-75dmm, a flash point≮260℃, and the raw material must contain one kind of poscan crude oil, and the poscan blending ratio is 30-40%, the saturates are 15-25%, the aromatic fraction is 40-45%, the gum is 21-28%, and the asphaltene is 9-13%.

[0011] Further, the hard deoiled asphalt is from a solvent deasphalting device, and requires that the softening point is ≮ 58℃, the penetration is ≯ 30dmm, the saturated fraction is 3-8%, the aromatic fraction is 30-35%, the gum is 15-22%, and the asphaltene is 35-45%.

[0012] Further, the phase change material is polyethylene wax, model PE-6000, which is polyethylene wax with a molecular weight of about 6000.

[0013] Further, the high molecular modifier is linear or star-shaped SBS modifier with a molecular weight of 100-300 thousand and a block ratio of 3:7, or SBR modifier.

[0014] The preparation method of the No. 50 asphalt according to any one of the above, comprising the following steps:

[0015] S1, add the hard deoiled asphalt and the high molecular modifier to the No. 70 base asphalt, heat to 160-175℃, and shear at a shear rate of 4000r / min for 0.3h using a shearing machine;

[0016] S2, transfer the mixture after step S1 is sheared to a constant temperature heating jacket, add the phase change material, and stir at a speed of 400r / min for 1.0h under constant temperature of 160-175℃, and then naturally cool to room temperature.

[0017] The beneficial effects of the present application are:

[0018] 1, the present application adopts the blending and micro-modification method, which avoids the problem that the direct distillation method causes too many intermediate transition products and the product economic benefit is not ideal when producing small batch No. 50 asphalt, and the production flexibility and economic benefit are improved.

[0019] 2, compared with the direct distillation method and the blending method of No. 50 asphalt in the conventional patent, the present application has good construction and workability, and the construction temperature is similar to that of ordinary No. 70 asphalt, without the need to change the construction method.

[0020] 3, the present application patent considers good high and low temperature performance, and the index has sufficient excess amount, so that the probability of quality risk in the later use process is greatly reduced.

[0021] 4, the present application patent has good anti-aging performance, and the nature basically does not change after 10 days of high-temperature storage, and the index also meets the requirements of the Ministry of Transport JTG F40 index. DETAILED DESCRIPTION

[0022] The technical solutions of the present application are described in detail by the following examples, which are only exemplary and can only be used to explain and illustrate the technical solutions of the present application, but cannot be interpreted as a limitation of the technical solutions of the present application.

[0023] Example 1

[0024] 70# asphalt (penetration 68 dmm, softening point 47.5℃, saturates 17%, aromatics 43%, resins 25%, asphaltenes 12%, flash point 270℃) is obtained by real boiling point cutting of Maris, Blue Light, and Pusang crude oil, wherein the proportion of Pusang is 35%, and the raw material is 100 parts; the high molecular modifier 791 SBS is 0.7 parts; the hard deoiled asphalt is 2 parts (penetration 0 dmm, softening point 115℃, saturates 4%, aromatics 30%, resins 22%, asphaltenes 41%); the phase change material is 0.5 parts of polyethylene wax. The preparation method is as follows: the hard deoiled asphalt and the SBS modifier are added to the base asphalt, heated to 165℃, and sheared at a shearing rate of 4000 r / min for 0.3 h by using a shearing machine. After shearing, it is transferred to a constant temperature heating jacket, the phase change material is added, and it is stirred at 400 r / min for 1.0 h at 165℃.

[0025] Example 2

[0026] 70# asphalt (penetration 68 dmm, softening point 47.5℃, saturates 17%, aromatics 43%, resins 25%, asphaltenes 12%, flash point 270℃) is obtained by real boiling point cutting of Maris, Blue Light, and Pusang crude oil, wherein the proportion of Pusang is 35%, and the raw material is 100 parts; the high molecular modifier 791 SBS is 0.7 parts; the hard deoiled asphalt is 2 parts (penetration 0 dmm, softening point 115℃, saturates 4%, aromatics 30%, resins 22%, asphaltenes 41%); the phase change material is 0.5 parts of polyethylene wax. The preparation method is as follows: the hard deoiled asphalt and the SBS modifier are added to the base asphalt, heated to 165℃, and sheared at a shearing rate of 4000 r / min for 0.3 h by using a shearing machine. After shearing, it is transferred to a constant temperature heating jacket, the phase change material is added, and it is stirred at 400 r / min for 1.0 h at 165℃.

[0027] Comparative Example 1

[0028] Maris and Blue Light mixed crude oil is used to cut 50# asphalt by direct distillation method, and the cutting temperature is 440℃. The storage stability test: 150℃ high temperature storage, and the key indicators are analyzed by periodic sampling.

[0029] Table 1 Detection results of different examples

[0030]

[0031] Continued table 1

[0032]

[0033] From Table 1, using the prepared No. 50 asphalt of the patent, first, the 60℃ dynamic viscosity is higher than that of the comparative example, indicating that it has excellent high-temperature performance and stronger grip with aggregate, but its 135℃ viscosity is lower than that of No. 50 asphalt and similar to that of No. 70 asphalt (No. 70 asphalt 135℃ viscosity: 0.39 pa·s), indicating that its workability is better than that of the comparative example, and the construction temperature does not need to be increased after replacing No. 70 with No. 50 asphalt. Secondly, under the premise of ensuring the softening point index, its 10℃ ductility before and after aging is more excellent, and the surplus is greater, having more excellent high and low temperature performance, and is less likely to have quality risks. The penetration index of the comparative example is also more excellent, indicating that its temperature sensitivity performance is better.

[0034] Table 2 Storage stability of Example 1 and comparative example

[0035]

[0036] Table 2 (continued)

[0037]

[0038] From Table 2, using the prepared No. 50 asphalt of the patent, it has a good component structure, its four components are basically the same as the straight distillation method, and has good high-temperature storage stability, after 10 days of 150℃ high-temperature storage, its three major indicators before aging are qualified and have a surplus, having good anti-aging performance. Compared with the comparative example, after 6 days of storage, the ductility reduction rate of the comparative example is 13%, and the ductility of Example 1 is increased by 6.7%.

[0039] The embodiments of the present application are merely examples for the purpose of clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description, and here it is not necessary or impossible to exhaust all embodiments, and these obvious changes or variations extended by the spirit of the present application are still within the protection scope of the present application.

Claims

1. A 50 asphalt characterized in that, By weight parts from 100 parts of 70 base asphalt, 2-25 parts of hard deoiled asphalt, 0.5-0.7 parts of high molecular modifier and 0.5-1 parts of phase change material composition; The 70 base asphalt is from the atmospheric and vacuum distillation unit, and requires a softening point ≮ 47℃, a penetration of 65-75 dmm, a flash point ≮ 260℃, and the raw material must contain a Persian Gulf crude oil, and the Persian Gulf blending ratio is 30-40%, the saturates are 15-25%, the aromatic fraction is required to be 40-45%, the gum is 21-28%, and the asphaltene is 9-13%; The hard deoiled asphalt is from a solvent deasphalting device, and requires a softening point ≮ 58℃, a penetration ≯ 30 dmm, a saturates fraction of 3-8%, an aromatic fraction of 30-35%, a gum of 15-22%, and an asphaltene of 35-45%; The phase change material is polyethylene wax, model PE-6000, which is a polyethylene wax with a molecular weight of 6000; The modifier is a linear or star-shaped SBS modifier with a molecular weight of 100-300 thousand and a block ratio of 3:7, or an SBR modifier.

2. A process for the preparation of the bitumen of claim 1, wherein, The steps include: S1, add hard deoiled asphalt and polymer modifier to 70 base asphalt, heat to 160-175℃, and shear at a shear rate of 4000 r / min for 0.3 h using a shear machine; S2, transfer the mixture after step S1 is sheared to a constant temperature heating jacket, add phase change material, and stir at a speed of 400 r / min for 1.0 h at a constant temperature of 160-175℃, and then naturally cool to room temperature.

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