A rubber powder composite modified asphalt composition and its preparation and application

A technology of composite modified asphalt and rubber powder, which is applied in the direction of building construction, on-site coagulation pavement, roads, etc., can solve the problems of high production cost, high reaction temperature, long shearing time, etc., to avoid reaction The effect of temperature, meeting performance requirements, and saving production costs

Active Publication Date: 2019-04-19
石家庄市公路桥梁建设集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But above these Chinese patents have all adopted longer shearing time in use, or have adopted higher reaction temperature, and production cost is high, and still do not have a kind of can solve the following problems simultaneously at present: solve the problem of stable storage; Has good high temperature, low temperature and adhesion properties; can be used in asphalt mixture like conventional SBS modified asphalt; meets other performance requirements of road engineering for asphalt; the preparation method is feasible

Method used

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  • A rubber powder composite modified asphalt composition and its preparation and application
  • A rubber powder composite modified asphalt composition and its preparation and application
  • A rubber powder composite modified asphalt composition and its preparation and application

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Experimental program
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Effect test

Embodiment 1-4

[0042] According to the ratio of the rubber powder composite modified asphalt composition in the present invention, a certain amount of sodium dibutyl phosphate and rubber powder are added to the asphalt, and the mixture is stirred for 60-120 minutes at 180-195°C. Then add a certain amount of styrene-butadiene-styrene block copolymer under the condition of 175~185℃ and cut for 30~60 minutes by colloid mill or high-speed shear emulsifier, and continue to the condition of 175~185℃ Add a certain amount of tetramethylthiuram disulfide, stir and react for 75-300 minutes to prepare modified asphalt. Among them, the asphalt is Esso No. 70 asphalt. The weight percentages of rubber powder are 5%, 10%, 15%, and 20% respectively; the weight percentages of sodium dibutyl phosphate are 0.5%, 1.0%, 1.5%, 2.5% respectively; styrene-butadiene The weight percentage of the ene-styrene block copolymer is 2%; the weight percentage of the tetramethylthiuram disulfide is 0.2%.

[0043] The formula, ...

Embodiment 5-7

[0049] Stir different weight percentages of sodium dibutyl phosphate and 20% 60 mesh rubber powder at 190°C for 120 minutes, add 2% styrene-butadiene-styrene block copolymer at 180°C and shear for 30 minutes. Continue to add 0.2% tetramethylthiuram disulfide at 180°C and stir for 120 minutes. The test results of different weight percentages of sodium dibutyl phosphate are shown in Table 2.

[0050] From the test data results in Table 2, the addition of sodium dibutyl phosphate improves the softening point and ductility of rubber powder modified asphalt at 5°C; the storage stability is significantly improved; no dibutyl phosphoric acid is added Sodium modified asphalt cannot be processed due to its excessive viscosity.

[0051] Table 2 Effect of sodium dibutyl phosphate on the performance of rubber powder modified asphalt

[0052]

Embodiment 8-13

[0054] Stir 2.5% sodium dibutyl phosphate and 20% 40 mesh rubber powder at 190°C for 120 minutes, add different weight percentages of styrene-butadiene-styrene block copolymer at 180°C and shear for 30 minutes. Continue to add tetramethylthiuram disulfide with different weight percentages at 180°C and stir for 120 minutes. The test results after adding different weight percentages of styrene-butadiene-styrene block copolymer and tetramethylthiuram disulfide are shown in Table 3:

[0055] Table 3 Research on the influence of processing temperature on the performance of rubber powder modified asphalt

[0056]

[0057] From the results of the above test data, increasing the content of styrene-butadiene-styrene block copolymer and tetramethylthiuram disulfide can increase the softening point of the composite modified asphalt and increase the ductility at 5°C. . And by compounding the styrene-butadiene-styrene block copolymer, the problem of easy segregation in high temperature storag...

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Abstract

The invention provides a rubber powder compound modified asphalt composition which comprises the following components in percentage by weight: 5-30% of a rubber powder, 0.5-5% of dibutyl sodium phosphate, 1-5% of styrene-butadiene-styrene block copolymer, 0.1-0.5% of tetramethylthiuram disulfide and the balance of asphalt. The invention further provides a preparation method and the application of the rubber powder compound modified asphalt composition. The rubber powder compound modified asphalt composition disclosed by the invention is stable in storage, has good high temperature, low temperature and adhesion properties, can be used in the asphalt mixture like the conventional modified asphalt; requirements on other performances of the asphalt in road engineering are met, and the preparation method is feasible.

Description

Technical field [0001] The invention belongs to the technical field of modified asphalt, and relates to a rubber powder composite modified asphalt composition and its preparation and application. Background technique [0002] Modified asphalt has been used in road engineering on a large scale, but the current modified asphalt mainly uses styrene butadiene triblock copolymer as modifier to prepare SBS modified asphalt. The main advantage is its excellent high temperature and low temperature performance. , Can be stored stably, but the biggest problem of this modified asphalt is that the cost of styrene butadiene triblock copolymer is too high. The price of its styrene butadiene triblock copolymer is generally 3% of the price of asphalt. -5 times, resulting in the high cost of the modified asphalt. [0003] Modified asphalt prepared with rubber powder as a modifier has also been widely used on roads. Its most widely used application is the application of rubber asphalt, which is cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L19/00C08L53/02C08K5/40C08K5/52E01C7/26
CPCC08L95/00C08L2201/08C08L2205/03C08L2555/60C08L2555/80C08L2555/84E01C7/265C08L19/003C08L53/02C08K5/40C08K5/52
Inventor 鄯增平冯丽霞黄卫东姚立明赵军辉王彦忠赵坤崔冬艳李彦伟赵文昊张京生李国东王小敏苌浩赵海栋白小伟
Owner 石家庄市公路桥梁建设集团有限公司
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