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Styrene-butadiene rubber modified asphalt composition and preparation method thereof

A technology of asphalt composition and styrene-butadiene rubber, which is applied in the direction of building structure, building components, building insulation materials, etc., can solve the problems of slow cross-linking speed, index drop, fast cross-linking speed, etc., to improve the viscosity and toughness and Toughness, product cost reduction, and effect of increasing crosslinking speed

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

However, most of the vulcanizing agents used are elemental sulfur or mixed with accelerators (such as tetramethylthiuram disulfide, etc.). Asphalt still has certain defects. First of all, when sulfur is used alone for vulcanization, the crosslinking speed is fast at the beginning, and after a certain period of time, the crosslinking speed slows down, so that it is difficult for a small amount of sulfur to react quickly with asphalt. Slowly reacting with asphalt for a long period of time makes the properties of modified asphalt continue to decline, which is manifested in the rapid decline of indicators during thermal storage of modified asphalt and film oven test, that is, the decrease of penetration and elongation, and the increase of softening point. Highly obvious
Adding accelerators can be improved to a certain extent, but the effect is not very satisfactory
In addition, the above-mentioned patents all add vulcanizing agent at one time. Practice has proved that adding vulcanizing agent at one time will make the polymer components quickly condense into a well-developed network structure and make it difficult to flow, which cannot ensure effective reaction between polymer and asphalt. Therefore, The actual process is not ideal

Method used

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  • Styrene-butadiene rubber modified asphalt composition and preparation method thereof
  • Styrene-butadiene rubber modified asphalt composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Heat the base asphalt at 160°C to a molten state, cut the block SBR (type 1500) into small particles below 10mm and add it to the base asphalt. The penetration of the base asphalt at 25°C is 140 1 / 10mm, and the softening point is 40.5°C, accounting for 94.9% (m) of the total amount, and SBR accounting for 5.0% of the total amount. At 160°C, mix with a high-shear emulsifier (rotational speed: 3800r / min) for 20 minutes, and then add it evenly over 40 minutes Composite additives accounting for 0.1% of the modified asphalt, the mixing reaction ended after 180 minutes, and the properties of the modified asphalt were tested (results are shown in Table 2).

Embodiment 2

[0035] Heat the base asphalt to 170°C to melt, and add SBR (type 1502) into the melted base asphalt under stirring with a high-shear mixer emulsifier (speed: 3900r / min). Among them, the 25°C penetration of the base asphalt is 128 1 / 10mm, the softening point is 43.6°C, accounting for 96.44% (m) of the total modified asphalt, and the powder SBR accounts for 3.0% of the total. At 170°C, mix for 50 minutes, and then use a common paddle stirring device (rotating speed 400r / min) to stir. At 170°C, add 0.06% of the total amount of composite additives into the above mixture in two batches, each batch The time for adding is 10 minutes, added in 5 times, the interval between two batches of adding is 50 minutes, and the reaction is completed after keeping 170°C for 150 minutes, and the properties of the modified asphalt are tested (results are shown in Table 2).

Embodiment 3

[0037] Heat the base asphalt to 180°C to melt, and add powdered SBR (type 1712) into the melted base asphalt under stirring with a high-shear emulsifier (rotational speed: 4000r / min). Among them, the 25°C penetration of base asphalt is 109 1 / 10mm, the softening point is 44.6°C, accounting for 96.26% (m) of the total modified asphalt, and the powder SBR accounts for 3.7% of the total. At 180°C, shear and mix for 30min, then switch to a common paddle stirring device (rotating speed 300r / min), and add 0.04% of the total amount of composite additives in three batches at 180°C, the first batch accounts for 30% of the composite additives 50%, add with 15min, after 30min, add the second batch of composite additive (accounting for 30% of composite additive), add with 5min, after 30min, add the 3rd batch of composite additive (account for 20% of composite additive), use After 10 minutes of adding, the mixing reaction ended after 120 minutes, and the properties of the modified asphalt w...

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Abstract

The invention provides a styrene-butadiene rubber modified asphalt composition and a preparation method thereof. The preparation method comprises the following steps of: grinding styrene-butadiene rubber grains or powder by using special equipment such as a high-shear equipment, colloid mill or the like at the temperature of between 150 and 230 DEG C, and uniformly dispersing in base asphalt to prepare a modified asphalt composition; adding a composite additive in an amount which accounts for 0.01 to 0.2 percent of the total weight of asphalt with the common stirring or stirring by using a high-shear emulsifying machine; and performing cross-linking reaction to prepare a styrene-butadiene rubber modified road asphalt product. The styrene-butadiene rubber modified asphalt has a simple production process; and the asphalt product has higher toughness and tenacity, high high-temperature performance and high low-temperature performance and is suitable for building high-grade highways.

Description

technical field [0001] The invention relates to a styrene-butadiene rubber-modified asphalt composition and a preparation method thereof, in particular to a styrene-butadiene rubber-modified asphalt composition and a preparation method thereof which can improve performance such as viscosity, toughness and toughness. Background technique [0002] In recent years, the rapid development of domestic highway construction has driven the development and application of new materials and new technologies for road construction. The Ministry of Communications attaches great importance to the development and application of new modified asphalt technologies, and has listed it as a national key scientific and technological research in the future. project. Research results at home and abroad show that polymer-modified asphalt can improve the performance of pavement to a certain extent, and styrene-butadiene rubber (SBR) can significantly improve the low-temperature ductility of asphalt. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L9/06C08K13/02C08K3/06C08K3/22C08K5/47C08K5/40C08K5/46
Inventor 郭皎河傅丽宁爱民张建峰姚汉荣
Owner CHINA PETROLEUM & CHEM CORP
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