Base asphalt, modified asphalt and preparation method

A technology of base asphalt and modified asphalt, applied in the processing of tar asphalt/petroleum asphalt/natural asphalt, multi-stage series refining and cracking process treatment, building components, etc. Segregation and other problems occur to achieve the effect of improving compatibility, optimizing hydrocarbon composition and molecular structure, and improving stability

Active Publication Date: 2022-02-01
PETROCHINA CO LTD +1
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  • Description
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Problems solved by technology

[0008] The main purpose of the present invention is to provide a base asphalt, a modified asphalt and a preparation method to solve the problem that the performance of the modified asphalt prepared by using the existing base asphalt is unstable and prone to segregation

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  • Base asphalt, modified asphalt and preparation method
  • Base asphalt, modified asphalt and preparation method
  • Base asphalt, modified asphalt and preparation method

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[0023] As described in the background art, the performance of the modified asphalt prepared by using the existing base asphalt is unstable, and the problem of segregation is prone to occur. In order to solve the above-mentioned technical problems, the application provides a method for preparing base asphalt, the preparation method comprising: using residual oil and / or deoiled asphalt as raw material for thermal cracking reaction to obtain a thermal cracking product, the content of asphaltene in the raw material is less than 1.0wt%, the atmospheric boiling point is higher than 350°C, and the atmospheric boiling point of the thermal cracking product is higher than 350°C; the thermal cracking product is oxidized with the aromatics-rich component to obtain matrix pitch, and the aromatics content in the aromatics-rich component is greater than 50wt%, the flash point is greater than 235°C.

[0024] Residual oil and deoiled bitumen with low asphaltene content can be thermally cracked...

Embodiment 1

[0054] 70% high asphaltene content component-1 was mixed with 30% furfural extracted oil, and the base asphalt 1 was obtained at an air oxidation temperature of 250°C, an air flow rate of 5L / min·Kg, and an oxidation time of 360min. Add 94.6% base asphalt 1 into the container, add 5.0% SBS, disperse at 170°C with a speed of 4500r / min high-speed shear for 60min, add 0.4% stabilizer composition after heating up to 190°C, and stir and mix for 240min to obtain Modified asphalt (analysis results of modified asphalt properties are shown in Tables 4 and 5), and the obtained SBS modified asphalt index meets the technical requirements of I-C polymer modified asphalt in "Technical Construction Specifications for Highway Asphalt Pavement" JTG F40-2004.

Embodiment 2

[0056] Using 65% high asphaltene content component-2 mixed with 30% furfural extracted oil and 5% catalytic cracking oil slurry, the air oxidation temperature is 230°C, the air flow rate is 4L / min·Kg, and the oxidation time is 300min to obtain matrix asphalt 2. Add 94.6% of base asphalt 2 into the container, add 5.0% SBS, and disperse at 170°C with a speed of 4500r / min for 45min at high shear speed, add 0.4% stabilizer composition after heating up to 190°C, and stir and mix for 180min to obtain Modified asphalt (analysis results of modified asphalt properties are shown in Tables 4 and 5), and the obtained SBS modified asphalt index meets the technical requirements of I-C polymer modified asphalt in "Technical Construction Specifications for Highway Asphalt Pavement" JTG F40-2004.

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Abstract

The invention provides a base asphalt, a modified asphalt and a preparation method. The preparation method comprises: using residual oil and / or deoiled asphalt as raw materials to carry out thermal cracking reaction to obtain thermal cracking products; and performing oxidation reaction on thermal cracking products and aromatic hydrocarbon components to obtain base asphalt. Residual oil and deoiled bitumen with low asphaltene content can be thermally cracked to obtain pyrolytic cracked products with high asphaltene content; then mixing the above pyrolytic cracked products with specific aromatic-rich components can optimize the hydrocarbon composition of bitumen , in order to obtain the raw material to be oxidized with higher asphaltenes content and aromatics content. The oxidation reaction of the raw materials to be oxidized is conducive to further optimizing the hydrocarbon composition and molecular structure of the matrix asphalt, and increasing the oxygen-containing functional groups with strong chemical polarity, which is conducive to improving the compatibility of the matrix asphalt with SBS and other added components. Furthermore, it is beneficial to improve the properties such as the stability of the modified asphalt prepared from the above-mentioned base asphalt.

Description

technical field [0001] The invention relates to the field of modified asphalt preparation, in particular to a base asphalt, modified asphalt and a preparation method. Background technique [0002] Nearly 20 years of pavement use experience shows that compared with ordinary petroleum road asphalt, SBS (styrene-butadiene-styrene block copolymer) polymer modified asphalt has better road performance. The surface layer of the road is almost all modified asphalt. SBS is a high-molecular polymer, and its molecular weight, density, chemical polarity, and solubility parameters are quite different from petroleum asphalt, and there is a difference in compatibility between the two, which prevents SBS from spontaneously blending with petroleum asphalt to form a stable modification. Sexual asphalt. SBS is easily separated from bitumen, the so-called segregation phenomenon. People have been studying various methods of preparing SBS modified asphalt for a long time. The preparation of m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00
CPCC10C3/00C10G55/04C08L95/00C08L53/02
Inventor 熊良铨杨克红毛三鹏蔺习雄张艳莉王援彭煜
Owner PETROCHINA CO LTD
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