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PG82-22 modified asphalt and preparation method thereof

A technology of modified asphalt and straight-run asphalt, used in building components, building insulation materials, buildings, etc., can solve the problem that the low temperature ductility damage of modified asphalt is relatively large, it is not conducive to the quality control of other products, and the segregation phenomenon of modified asphalt is aggravated. and other problems, to achieve the effect of improving anti-rutting performance and anti-aging performance, ensuring actual road performance, and avoiding high-temperature thermal oxidation aging.

Active Publication Date: 2022-04-15
江苏中亿通道路新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the high-strength modified asphalt (CN101270227A) uses a relatively high content (6-7%) of rock asphalt and SBS modifier to modify the matrix asphalt, which has high high-temperature performance and 60 °C DSR index, but high Mixed rock asphalt powder is easy to deposit on the bottom of the tank, and the processing process is easy to pollute the asphalt pipeline, which is not conducive to the quality control of other products; resin and anti-rutting agent can have good modification performance on asphalt at high temperature, but its low temperature crack resistance is insufficient , the anti-aging performance is poor, and as the content increases, the low-temperature ductility of the modified asphalt will be greatly damaged, and the high-temperature viscosity will increase rapidly, which is not conducive to on-site construction and mixing; a modified asphalt that meets the PG82-22 grade and Its preparation method (CN105176110A) uses polyphosphoric acid and PE to modify asphalt, which can greatly improve the high-temperature performance of asphalt, but it will also aggravate the high-temperature viscosity index of modified asphalt, and because polyphosphoric acid promotes the formation of asphaltene clusters Decomposition tends to aggravate the molecular weight difference between the modifier and asphalt, which leads to aggravation of the segregation phenomenon of modified asphalt; in China, wax additives such as Sasol wax are also used to study the rheological behavior of modified asphalt. The rheological properties of modified asphalt have been improved, but with the prolongation of high-temperature storage time, the performance of additives is prone to attenuation, and longer storage time will easily lead to insufficient performance of the binder

Method used

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  • PG82-22 modified asphalt and preparation method thereof
  • PG82-22 modified asphalt and preparation method thereof
  • PG82-22 modified asphalt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: A kind of PG82-22 modified asphalt and preparation method thereof

[0043] A kind of PG82-22 modified asphalt, calculated according to the parts by mass, includes the following components:

[0044]

[0045] A preparation method of PG82-22 modified asphalt, comprising the following steps:

[0046] S1: Weigh 65g of linear SBS modifier with a molecular weight of 150,000, 1000g of SK90# base asphalt, 5g of antioxidant (β-(4-hydroxyphenyl-3,5-di-tert-butyl) propionate n-octadecanoate Carbon alcohol ester: triphosphite = 3:2), sulfur stabilizer 1g, lauric acid 60g (0.3mmol / kg), ursi D10g (0.1mmol / kg);

[0047] S2: After heating SK90# base asphalt to 160°C, add SBS modifier, shear at a speed of 3000r / min for 1.0h, and stir for 2h;

[0048] S3: Add lauric acid, n-octadecyl β-(4-hydroxyphenyl-3,5-di-tert-butyl)propionate and triphosphite, and stir at 180°C for 1.5h;

[0049] S4: add sulfur stabilizer, stir at 180°C for 5 hours to obtain modified asphalt;

[...

Embodiment 2

[0052] Embodiment 2: A kind of PG82-22 modified asphalt and its preparation method

[0053] A kind of PG82-22 modified asphalt, calculated according to the parts by mass, includes the following components:

[0054]

[0055]

[0056] A preparation method of PG82-22 modified asphalt, comprising the following steps:

[0057] S1: Weigh 30g of linear SBS modifier with a molecular weight of 150,000, 1000g of Xitai 70# base asphalt, 1.8g of antioxidant (β-(4-hydroxyphenyl-3,5-di-tert-butyl) propionic acid N-octadecyl alcohol ester: triphosphite = 1:0.8), sulfur stabilizer 2g, lauric acid 40g (0.2mmol / kg), Wuersi D10g (0.1mmol / kg);

[0058] S2: After heating Xitai 70# base asphalt to 180°C, add SBS modifier, shear at a speed of 5000r / min for 1.0h, and stir for 2h;

[0059] S3: Add lauric acid, n-octadecyl β-(4-hydroxyphenyl-3,5-di-tert-butyl)propionate and triphosphite, and stir at 180°C for 1.5h;

[0060] S4: add sulfur stabilizer, stir at 180°C for 5 hours to obtain modifie...

Embodiment 3

[0063] Embodiment 3: A kind of PG82-22 modified asphalt and its preparation method

[0064] A kind of PG82-22 modified asphalt, calculated according to the parts by mass, includes the following components:

[0065]

[0066] A preparation method of PG82-22 modified asphalt, comprising the following steps:

[0067] S1: Weigh 55g of linear SBS modifier with a molecular weight of 100,000, 1000g of straight-run asphalt (SK90# base asphalt: CNOOC 50# base asphalt=1:1), 3.5g of antioxidant (four (β-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionate) pentaerythritol ester: triphosphite = 4:3), sulfur stabilizer 2g, stearic acid 70g (0.25mmol / kg), Wuersi D10g (0.1 mmol / kg);

[0068] S2: After heating straight-run asphalt to 175°C, add SBS modifier, shear at a speed of 4000r / min for 1.0h, and stir for 1.5h;

[0069] S3: Add stearic acid, tetrakis(β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) pentaerythritol ester and triphosphite, and stir at 175° C. for 1.0 h;

[0070] S4: add s...

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Abstract

The invention discloses PG82-22 modified asphalt and a preparation method thereof. The PG82-22 modified asphalt comprises the following components in parts by weight: 100 parts of straight-run asphalt, 3.0-6.5 parts of a polymer modifier, 0.1-0.5 part of an antioxidant, 0.1-0.5 part of a stabilizer, 3.0-7.0 parts of an in-situ reinforcing agent component A and 0.5-2.5 parts of an in-situ reinforcing agent component B. The invention further discloses a preparation method of the PG82-22 modified asphalt. On the basis of an in-situ amidation enhancement principle, high-temperature asphalt is used as an amidation reaction carrier, an in-situ enhancer component B is added into the asphalt 1-2 hours before use to realize in-situ amidation reaction with a pre-mixed in-situ enhancer component A, so that the high-temperature performance of the asphalt is improved, and PG82-22 asphalt is obtained; the high-temperature thermo-oxidative aging of the amide compound modifier is avoided, and the rutting resistance and the aging resistance of the modified asphalt are ensured. The modified asphalt prepared by the invention overcomes the technical defects of high viscosity, low-temperature brittleness, easiness in aging and the like in the traditional technical route, and is excellent in weather resistance, simple and convenient to produce, easy to mix and construct, economical and environment-friendly.

Description

technical field [0001] The invention relates to modified asphalt for road and bridge pavement, in particular to PG82-22 modified asphalt and a preparation method thereof. Background technique [0002] With the improvement of living standards and the increase of climate temperature year by year, the traffic load on asphalt pavement increases year by year, rutting occurs frequently, and with the increase of service life, the thermal oxygen aging of asphalt binder is also gradually aggravated. The performance of the binder used in the asphalt pavement will be difficult to meet the service requirements, and the asphalt needs to be further modified to improve the anti-rutting performance and anti-aging performance of the asphalt. [0003] The main measure to improve the anti-rutting performance of asphalt binder in the prior art is to blend and modify the asphalt with high-volume rock asphalt, PE, resin, acid modifier and anti-rutting agent to prepare high-strength modified aspha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L53/02C08K5/20
CPCY02A30/30
Inventor 潘友强关永胜庞一朋陈李峰李款
Owner 江苏中亿通道路新材料有限公司
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