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Road asphalt modifier, modified road asphalt, preparation method thereof, and asphalt mixture

A technology of road asphalt and modifier, which is applied in the direction of building insulation materials, building components, buildings, etc., can solve the problems of low softening point, high viscosity of the system, widening gap between viscosity and polymer viscosity, etc., and achieves simple preparation method, Guaranteed uniform mixing and high water stability

Active Publication Date: 2022-06-21
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the technical solutions of the above three patent documents can all produce modified road asphalt that meets the technical indicators of the industry, the following problems still exist: 1) After the polymer is pre-dissolved in heavy petroleum oil, the viscosity of the system is too high, making it difficult to For material transportation, large-scale production cannot be carried out; 2) The mixture of polymer and petroleum heavy oil needs to be mixed at a temperature higher than the softening point of the direct coal liquefaction bitumen to prepare the modifier, and the higher mixing temperature is easy to cause polymerization 3) The addition of too much petroleum heavy oil in the above system causes the softening point of the coal direct liquefaction modified asphalt to be low, which affects the high temperature performance of the asphalt mixture; and The addition of petroleum heavy oil also increases the viscosity difference between the direct coal liquefaction bitumen system and the polymer, which makes it difficult to mix uniformly; The complexity of the process and the operating cost, which is not conducive to industrial production

Method used

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  • Road asphalt modifier, modified road asphalt, preparation method thereof, and asphalt mixture
  • Road asphalt modifier, modified road asphalt, preparation method thereof, and asphalt mixture
  • Road asphalt modifier, modified road asphalt, preparation method thereof, and asphalt mixture

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preparation example Construction

[0027] According to the second aspect of the present invention, the present invention provides the preparation method of the road asphalt modifier according to the first aspect of the present invention, the method comprises: after heating the coal directly liquefied asphalt, stirring with the polymer evenly, and then cooling, To obtain liquefied asphalt, the coal is directly used as a road asphalt modifier.

[0028] The heating temperature is 5-20°C lower than the softening point of the coal direct liquefaction pitch, for example, 150-190°C. The heating temperature of the present invention can ensure that the viscosity of the polymer and the coal direct liquefaction asphalt are not much different, so as to ensure the uniform mixing of the two, and in addition, the temperature can also avoid the decomposition of the polymer.

[0029] According to the preparation method of the present invention, preferably, the method further comprises, before heating, pulverizing and drying the...

Embodiment approach

[0032] According to an embodiment, the road asphalt modifier is prepared by a twin-screw extruder, wherein the material enters the twin-screw via a feeder, and the temperature of the screw is kept at 5-20°C lower than the softening point of the liquefied asphalt during processing. Within the temperature range of ℃, the rotational speed of the screw is controlled at 100-600 rpm, and the road asphalt modifier is obtained by uniform mixing, extrusion, granulation and drying by the screw.

[0033] According to another preferred embodiment, the road asphalt modifier is prepared by an internal mixer, the internal mixing temperature is controlled within a temperature range of 5-20°C lower than the softening point of the liquefied asphalt, and the rotor speed of the internal mixer is 60°C. -350rpm, after the material is uniformly kneaded, cooled and pulverized to obtain the road asphalt modifier.

[0034] According to a third aspect of the present invention, the present invention prov...

Embodiment 1

[0060] (1) Preparation of road asphalt modifier

[0061] The direct coal liquefaction pitch (softening point of 180° C.) is pulverized and dried to obtain a direct coal liquefaction pitch powder with a particle size of less than 3 mm and a moisture content of less than 0.5% by weight. The coal direct liquefaction asphalt powder and SBS1301 (produced by Baling Petrochemical, the same below) are stirred and uniformly mixed in a twin-screw extruder at a weight ratio of 100:90 at 160-170 ° C, and then granulated after cooling to obtain a particle size smaller than 5mm road asphalt modifier.

[0062] (2) Preparation of modified road asphalt

[0063] Mix the road asphalt modifier with 15% by weight, 13% by weight of petroleum heavy oil A, and 72% by weight of 90# petroleum asphalt in a shear emulsifier at 150 ° C, first with a line speed of 30m / s Shear at high speed for 30 minutes, and then continue to stir at a linear speed of 1 m / s for 1 hour to obtain modified road asphalt. The...

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PUM

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Abstract

The invention relates to the field of coal direct liquefaction, and discloses a road asphalt modifier, a modified road asphalt, a preparation method thereof, and an asphalt mixture. The road asphalt modifier comprises direct coal liquefaction asphalt and a polymer, and relative to 100 parts by weight of the direct coal liquefaction asphalt, the content of the polymer is 75-150 parts by weight. The softening point of the modified road asphalt prepared by using the road asphalt modifier is higher than 75 DEG C, and the ductility at 5 DEG C is higher than 35 cm, and the modified asphalt has a wide application range. The asphalt mixture prepared with the road asphalt modifier or modified road asphalt of the invention has high water stability, rutting resistance and low temperature cracking resistance.

Description

technical field [0001] The invention relates to the field of direct coal liquefaction, in particular to a road asphalt modifier and a preparation method thereof, a modified road asphalt prepared from the road asphalt modifier and a preparation method thereof, and a modified road asphalt or The asphalt mixture of the road asphalt modifier. Background technique [0002] How to efficiently and rationally utilize the direct coal liquefaction residue (also known as "coal direct liquefaction pitch") is the current bottleneck restricting the development of direct coal liquefaction technology. The waste of valuable resources can reduce the impact on the environment, and can effectively improve the economy of the direct coal liquefaction process and promote the development of the direct coal liquefaction technology. [0003] With the development of my country's highway transportation industry, especially high-grade highways, the mileage of traffic has increased year by year, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L53/02C08L57/02C04B26/26
CPCC04B26/26C08L95/00C08L2205/025C08L2205/035C08L53/02C08L57/02C04B14/00
Inventor 张胜振卓锦德梁文斌盛英陈闯魏建明
Owner CHNA ENERGY INVESTMENT CORP LTD