modified asphalt composition

A technology of modified asphalt and composition, which is applied in the direction of building structure, on-site paved coagulation pavement, road, etc., to achieve the effect of feasible preparation method, improved construction performance and meeting performance requirements

Active Publication Date: 2020-03-13
SHANGHAI QUNKANG ASPHALTUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But none of the above Chinese patents can solve the following problems at the same time: solve the problem of storage stability; have good high temperature, low temperature and adhesion properties; can be used in asphalt mixture like conventional SBS modified asphalt; satisfy Other performance requirements of asphalt for road engineering; the preparation method is feasible

Method used

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preparation example Construction

[0030] Further, the preparation method of the rubber powder modified asphalt comprises the steps of: adding rubber powder to the base asphalt at a reaction temperature above 200°C, using a desulfurization degradation process to promote the dissolution of the rubber powder in the base asphalt phase, Obtain rubber powder modified asphalt.

[0031] Further preferably, the preparation method of the rubber powder modified asphalt comprises the steps of: adding rubber powder to the base asphalt at a reaction temperature of 240-280°C and reacting for 4-8 hours; using a desulfurization degradation process to promote the rubber powder Dissolved in the matrix asphalt phase to obtain rubber powder modified asphalt.

[0032] Further, the rubber hydrocarbon content of the rubber powder is >40% (the test method for the rubber hydrocarbon content of the rubber powder adopts GB / T14837). Low rubber hydrocarbon content will lead to the problem of poor adhesion of the prepared rubber powder mod...

Embodiment 1～4

[0052] The formula of rubber powder modified asphalt is A: rubber powder (30 mesh) weight percent 20wt%, asphalt balance.

[0053] The preparation method of rubber powder modified asphalt: under different reaction conditions (reaction temperature, reaction time), rubber powder is added in matrix asphalt, use desulfurization degradation process to promote rubber powder to dissolve in matrix asphalt phase, obtain embodiment respectively 1-4 rubber powder modified asphalt. The test results are shown in Table 1:

[0054] Table 2 Technical indicators of rubber powder modified asphalt prepared under different reaction conditions

[0055]

Embodiment 5～9

[0061] The rubber powder modified asphalt prepared in Example 1 was used. Then add 3wt% styrene-butadiene-styrene block copolymer at 180°C, shear for 30 minutes by a colloid mill or a high-speed shear emulsifier, and continue to add different amounts of crosslinking agents and stir for 120 minutes.

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Abstract

The invention belongs to the field of road building materials, and particularly relates to a modified asphalt composition, and preparation and application thereof. The modified asphalt composition is prepared from the following ingredients in percentage by weight: 1 to 6 weight percent of styrene-butadiene-styrene block copolymers, 0.1 to 0.4 weight percent of cross-linking agents and the balance of rubber powder modified asphalt, wherein the weight percentage of ingredients which are not dissolved in tetrahydrofuran and have the particle diameter being greater than 0.45 micrometers in the rubber powder modified asphalt is lower than 4 weight percent; the weight percentage of ingredients which have the molecular weight being greater than 19000 and can be dissolved into the tetrahydrofuran is between 1 weight percent and 7 weight percent. The problem of low storage stability of the rubber powder modified asphalt is effectively solved; the viscosity of the modified asphalt is greatly reduced; the construction performance is improved.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L21/00C08L53/02C08K3/06C08K3/04E01C7/26
CPCC08L95/00C08L2201/08C08L2205/03E01C7/265C08L21/00C08L53/02C08K3/06C08K3/04
Inventor 纪淑贞李本亮姜尧
Owner SHANGHAI QUNKANG ASPHALTUM TECH CO LTD
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