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Composite high-viscosity modified asphalt and preparation method thereof

A technology of modified asphalt with high viscosity, which is applied in building components, building insulation materials, buildings, etc. It can solve the problems of unreported segregation test of modified asphalt, high viscosity of modified asphalt at 135°C, and limited amount of SBS added. , to achieve the effects of excellent thermal storage stability, excellent high and low temperature performance, and reduced segregation tendency

Inactive Publication Date: 2014-05-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN101538408A directly adds thermoplastic rubber, thermoplastic resin, compatibilizer, viscosity modifier, anti-aging agent to asphalt, and prepares high-viscosity modified asphalt by stirring and shearing; but the segregation test of modified Zhonghai asphalt has not been reported
The addition of sulfur requires strict control of the addition process and amount to prevent gelation; it is easy to make the viscosity of the modified asphalt too high at 135°C, which limits the amount of SBS addition; it will generate harmful gases during the construction process and affect the construction environment.

Method used

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  • Composite high-viscosity modified asphalt and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: In terms of mass fraction, add 6 parts of SBS to 94 parts of 70# Zhonghai bitumen, and perform high-speed shearing at 170-190°C for 45 minutes, and the shearing speed is 3000r / min.

[0033] Step 2: Transfer the sheared modified asphalt to a high-speed disperser and stir for 150 minutes. The stirring speed is 800-900r / min. During the process, add a total of 0.15 parts of sulfur to prepare modified asphalt.

[0034] The prepared modified asphalt is numbered 1, and its properties are shown in Table 1.

Embodiment 2

[0036] Step 1: In terms of parts by mass, mix 50 parts of SBS and 50 parts of desulfurized colloidal particles evenly, and prepare SBS / desulfurized colloidal granules compound by mixing in a Hacker internal mixer, the reaction temperature is 160°C, and the rotational speed is 50r / min, the time is 10min. After blending, the modified particles are prepared by mechanical granulation.

[0037] Step 2: In terms of parts by mass, add 12 parts of modified particles to 88 parts of 70# Zhonghai bitumen, and shear at 170-190°C for 60 minutes at a high speed with a shear speed of 4000r / min.

[0038]Step 3: Transfer the sheared modified asphalt to a high-speed disperser and stir for 120 minutes at a stirring speed of 800-900 r / min to prepare a composite high-viscosity modified asphalt.

[0039] The prepared modified asphalt is numbered 2, and its properties are shown in Table 1.

Embodiment 3

[0041] Step 1: In terms of parts by mass, add 6 parts of SBS, 6 parts of desulfurized rubber particles, and 1 part of epoxy natural rubber to 87 parts of 70# Zhonghai bitumen, and shear at a high speed for 60 minutes at 170-190 ° C , The shear speed is 4000r / min.

[0042] Step 2: Transfer the sheared modified asphalt to a high-speed disperser and stir for 120 minutes at a stirring speed of 800-900 r / min to prepare a composite high-viscosity modified asphalt.

[0043] The prepared modified asphalt is numbered 3, and its properties are shown in Table 1.

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Abstract

The invention relates to composite high-viscosity modified asphalt and a preparation method thereof. The raw material comprises the following components by weight percent: 84-88% of heavy duty bitumen and 12-16% of modified compounds. The method comprises the following steps: mixing SBS, desulfurized colloidal particles and a compatilizer containing an epoxy group to prepare a modified compound; preparing modified particles after mechanically pelletizing; adding the modified particles to asphalt at 170-190 DEG C; melting and refining compound particles after shearing at a high speed for 30-60 minutes on a high-speed mixing emulsifier; transferring the sheared asphalt to a high-speed disperser, and agitating to obtain the composite high-viscosity modified asphalt. The composite high-viscosity modified asphalt prepared by using the method has the characteristics of stable heat storage, and excellent high and low temperature properties, has good economic benefits and environmental effects because of use of waste rubber, and is free of sulphur as a stabilizer, the construction viscosity can be reduced, the construction environment can be improved, and the problem that incompatible asphalt is difficult to stabilize is solved.

Description

technical field [0001] The invention relates to the field of asphalt improvement, in particular to a composite high-viscosity modified asphalt and a preparation method thereof. Background technique [0002] As a cementing material, asphalt has the advantages of waterproof, insulation, corrosion resistance, etc., and has a good bonding effect with stone ore materials. It has been widely used as road construction materials for a long time. In recent years, with the increase of traffic volume and traffic load, people have put forward more stringent requirements for road paving asphalt materials, but ordinary asphalt is prone to rutting at high temperature and cracking at low temperature, which can no longer fully meet the actual needs. Adding a high content of polymer to asphalt to prepare high-viscosity modified asphalt can effectively improve the high and low temperature performance of asphalt. Therefore, people have been devoting themselves to the research and development o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L53/02C08L15/00C08K3/06
Inventor 姚鸿儒王仕峰姬婷婷
Owner SHANGHAI JIAO TONG UNIV
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