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Styrene butadiene rubber modified asphalt and preparation method thereof

A technology of modified asphalt and asphalt, which is applied to building components, building insulation materials, buildings, etc., and can solve the problems of increased cost of modified asphalt, prolonging production time, increasing production costs, etc.

Active Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For general asphalt, it is difficult to meet the index requirements when only a small amount of SBR is added.
If more SBR modifier is added, it will inevitably cause problems such as increased cost of modified asphalt and difficult processing.
[0004] In order to solve the problems existing in the use of styrene-butadiene rubber, U.S. patents US3,634,293 and US4,130,516 reported that when using styrene-butadiene rubber to modify asphalt, cross-linking agents such as sulfur were added to improve the stability of the modified asphalt. Significantly improved, but modified asphalt cannot be used due to excessive cross-linking
In order to increase the dispersibility and compatibility of SBR in asphalt, Chinese patent CN200610023104 discloses a method of adding SBR latex, although it solves the problem of SBR adding difficulty, but because of the water in the emulsion, the step of stirring and dehydration is added, not only The production time is prolonged, and water vaporization can easily cause accidents such as asphalt overflow, making production difficult to operate
Chinese patent CN01135212 discloses a method in which SBR is firstly dissolved in high-aromatic fractions to make mother liquor. Although it achieves the purpose of compatibility with asphalt, it not only increases the production process, but also increases the production cost, and the production cycle is also longer.
In addition, the viscosity of SBR made into mother liquor is very high, which will bring great difficulties to transportation

Method used

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  • Styrene butadiene rubber modified asphalt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The base asphalt with a penetration of 102 1 / 10mm at 25°C and a softening point of 44.3°C, accounting for 97.4% (m) of the total, is heated to a molten state at 160°C, and 2.5% (m) of SBR is added to the base asphalt In the process, use a high-shear mixing emulsifier to cut for 20 minutes, then use ordinary stirring equipment to stir, then add 0.1% reaction additives, and complete the mixing reaction at 175°C for 50 minutes, and test the properties of the modified asphalt (results are shown in Table 1 ). The composition of the reaction auxiliary agent is as follows: p-quinonedioxime (QDM) accounts for 80%, and hexamethylenetetramine (H) accounts for 20%.

Embodiment 2

[0028] Heat the basic asphalt with a penetration of 129 1 / 10mm at 25°C and a softening point of 42.7°C, accounting for 96.35% of the total amount, to 165°C, and add 3.5% of the total amount of SBR under the action of a high-shear mixing emulsifier Into the base asphalt, mixed for 30 minutes, replaced with ordinary stirring equipment, and then added 0.15% reaction additives, the reaction ended after 100 minutes, and the properties of the modified asphalt were tested (results are shown in Table 1). Wherein the composition of the reaction aid is as follows: 4,4'-dibenzoylquinone dioxime (DGM) accounts for 60%, hexamethyltetramine (H) 20%, and di-o-tolylguanidine (DOTG) 20%.

Embodiment 3

[0032] The base asphalt with a penetration of 143 1 / 10mm at 25°C and a softening point of 42.0, accounting for 95.3% of the total, is heated to 175°C, and 4.5% of SBR is added to the molten In the basic asphalt, shear and mix for 40 minutes, then use ordinary mixing equipment to stir, then add 0.2% reaction additive at 185 ° C, and the mixing reaction ends after 80 minutes, and the properties of the modified asphalt are tested (results are shown in Table 1). The composition of the reaction auxiliary agent is as follows: p-quinonedioxime (QDM) accounts for 75%, and diphenylguanidine (DPG) accounts for 25%.

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Abstract

The invention provides a method for improving using performance of styrene butadiene rubber modified road asphalt. A polymer is uniformly dispersed into base asphalt with mixing and emulsification equipment with high shearing force at the temperature of between 100 and 200 DEG C and a reaction auxiliary agent (comprising a cross-linking agent and an accelerator) in an amount which is 0.01 to 5 percent based on the total mass of asphalt is added into the mixture to prepare the polymer modified road asphalt. A production process is simple and reaction time is short; and asphalt products have high using performance, such as stability, toughness, ageing resistance and the like and are suitable to be industrially produced.

Description

technical field [0001] The invention relates to a polymer modified asphalt composition and a preparation method thereof, in particular to an asphalt composition with improved stability, viscous toughness, toughness and aging resistance and a preparation method thereof. Background technique [0002] Asphalt has been widely used as the main bonding material in road engineering. However, because asphalt is more sensitive to temperature, the asphalt pavement is prone to wrapping and oil flooding when the temperature is high in summer, and it is prone to cracking when the temperature is low in winter, which affects the durability of the asphalt pavement. Especially with the development of the economy, the traffic volume, driving speed and traffic load are increasing day by day, which puts forward higher requirements on the performance and life of high-grade highways. In order to further improve the quality of asphalt, the asphalt is modified by adding high-molecular polymers to ...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L9/06C08L11/00C08L9/00C08K5/33C08K5/3492C08K5/31C08J3/24
Inventor 傅丽郭皎河张建峰姚汉荣
Owner CHINA PETROLEUM & CHEM CORP